JP2013224729A - Vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damper which enables a spring constant in the axial direction to be increased while reducing a spring constant in the torsional direction and a spring constant in the direction perpendicular to the axial direction, and which enables movement of two divided parts, i.e., a first outer cylinder part and a second outer cylinder part to be suppressed in a direction in which the dividing surfaces thereof are brought close together.SOLUTION: With spaces SP formed between the dividing surfaces of a first rubber part 431 and a second rubber part 431, a spring constant in the axial direction can be increased while a spring constant in the torsional direction and a spring constant in the direction perpendicular to the axial direction are reduced. In this case, an interposed member 450 is disposed between the dividing surfaces of a first outer cylinder part 421 and a second outer cylinder part 422. Thus, the movement of the first outer cylinder part 421 and the second outer cylinder part 422 can be restricted in a direction in which the dividing surfaces thereof are brought close together, while securing the spaces SP between the dividing surfaces of the first rubber part 431 and the second rubber part 432.

Description

  The present invention relates to a vibration isolator, and in particular, while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased, and the first outer cylinder portion and the second portion divided into two are divided. The present invention relates to a vibration isolator capable of suppressing the movement of the outer cylinder portion in a direction in which the divided surfaces are brought close to each other.

  In the bush (vibration isolation device) used for the suspension device, the inner cylinder member and the outer cylinder member are connected by a rubber base made of a rubber-like elastic body. It is required to reduce the spring constant.

  In Patent Document 1, in order to reduce the spring constant in the twisting direction, a spherical bulging portion 4 bulging outward in the radial direction is provided at an axially intermediate portion of the inner cylinder 1 (inner cylinder member). An anti-vibration bush 101 (anti-vibration device) that forms an inner peripheral surface portion of the outer cylinder 2 (outer cylinder member) surrounding the bulging portion 4 into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 4. Disclosed.

  According to this anti-vibration bush 101, the rubber-like elastic body 3 (rubber base) is mainly formed between a convex spherical surface and a concentric concave spherical surface with respect to an input of displacement in the twisting direction. Since it can be deformed in the shearing direction, the spring constant in the twisting direction can be reduced.

JP 2008-019927 (paragraphs 0006, 0020, FIG. 1, etc.)

  However, the conventional anti-vibration bush 101 described above has a problem that it is not possible to sufficiently increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  On the other hand, as a result of diligent study, the applicant of the present application divided the rubber base into a first rubber part and a second rubber part at an axially central part in order to solve the above problems, and the first rubber. The present inventors have come up with a configuration in which a space is formed between the divided surface of the part and the divided surface of the second rubber part (not known at the time of filing this application).

  In this case, the outer cylinder member is also divided into a first outer cylinder part and a second outer cylinder part at the center in the axial direction, and the first outer cylinder part and the second outer cylinder part have their respective split surfaces in the axial direction. In a separated state, it is held and fixed by a cylindrical member.

  However, in this way, when the dividing surface of the first outer cylinder portion and the dividing surface of the second outer cylinder portion are separated in the axial direction, the first outer cylinder portion and the first outer cylinder portion are It has been found that the two outer cylinder parts move in a direction in which the divided surfaces are brought close to each other.

  The present invention has been made against the background of the above circumstances. While reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased and the first divided into two parts. It aims at providing the vibration isolator which can suppress that an outer cylinder part and a 2nd outer cylinder part move to the direction which makes a mutual division surface approach.

Means for Solving the Problems and Effects of the Invention

  According to the vibration isolator of claim 1, the inner cylinder member having a spherical bulge that bulges radially outward, and the concave shape that is a concave spherical surface that surrounds the bulge of the inner cylinder member. Since it has an outer cylinder member having an inner peripheral surface and a rubber base that connects between the outer peripheral surface of the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the outer cylindrical member, Thus, the rubber substrate can be deformed mainly in the shear direction. Therefore, there is an effect that the spring constant in the twisting direction can be reduced.

  In this case, according to the first aspect, the outer cylinder member is divided into two parts in the axial direction, the first outer cylinder part and the second outer cylinder part, and the concave inner peripheral surface and the second outer cylinder part in the first outer cylinder part. The first outer cylinder part and the second outer cylinder part are connected by the first rubber part and the second rubber part, respectively, between the concave inner peripheral surface of the outer cylinder part and the outer peripheral surface of the bulging part of the inner cylinder member. Is held and fixed by a cylindrical cylindrical member disposed on the outer peripheral side.

  Therefore, after the first rubber portion and the second rubber portion are vulcanized and molded, the dividing surface of the first rubber portion and the dividing surface of the second rubber portion are separated in the axial direction so that there is a space between the dividing surfaces. In the state of being formed, the first outer cylinder part and the second outer cylinder part can be held and fixed by the cylindrical member. Thus, by forming a space between the dividing surface of the first rubber part and the dividing surface of the second rubber part, the shear component of the rubber substrate in the twisting direction and the rubber substrate in the direction perpendicular to the axis can be formed. The compression component of the rubber base in the axial direction can be ensured while suppressing the compression component. As a result, it is possible to increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  Furthermore, according to the first aspect, since the regulating means interposed between the dividing surface of the first outer cylinder part and the dividing surface of the second outer cylinder part is provided, the dividing surface of the first rubber part and the second It is possible to restrict the movement of the first outer cylinder part and the second outer cylinder part in the direction in which the respective divided surfaces are brought close to each other while securing a space between the rubber part and the divided surface. That is, since the movement in such a direction can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member, when the large displacement is input in the axial direction, the first outer cylinder portion or the second outer cylinder It can suppress reliably that a part shifts position with respect to a cylindrical member.

  In the rubber base, the first rubber portion and the second rubber portion do not need to be completely divided (divided) in the axial direction, and it is sufficient that the rubber base is divided in the axial direction at least on the outer cylinder member side. Therefore, the 1st rubber part and the 2nd rubber part may be connected by the inner cylinder member side (it does not need to be divided in the direction of an axis). That is, the first rubber part and the second rubber part may be connected by a part of the rubber base that covers the outer peripheral surface of the inner cylinder member.

  According to the vibration isolator of claim 2, in addition to the effect of the vibration isolator according to claim 1, the maximum outer diameter of the bulging portion of the inner cylinder member is the first outer cylinder portion and the second outer cylinder. Since it is made larger than the minimum inner diameter at the axial end opening of the cylindrical portion, the pressure receiving area can be increased with respect to displacement in the axial direction, and the compression component of the rubber base can be secured. As a result, the effect of increasing the spring constant in the axial direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  Note that, in the conventional product in which the rubber base is continuously disposed between the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the outer cylindrical member, the configuration according to claim 2 is the rubber in the axial direction. Simultaneously with the compressive component of the base, the shear component of the rubber base in the twisting direction and the compressive component of the rubber base in the direction perpendicular to the axis also increase, and thus cannot be employed. This is possible for the first time by forming a space between the dividing surface and the dividing surface of the second rubber part, thereby ensuring the compression component of the rubber base in the axial direction and the rubber in the twisting direction. The shear component of the substrate and the compression component of the rubber substrate in the direction perpendicular to the axis can be suppressed. That is, the spring constant in the axial direction can be increased while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  According to the vibration isolator of claim 3, in addition to the effect of the vibration isolator according to claim 1 or 2, it is integrally formed with at least one of the first outer cylinder part or the second outer cylinder part. Since the control projection includes a control projection that partially protrudes along the axial direction from the dividing surface, and the control projection serves as a control means, the product cost can be reduced and the first outer cylinder with respect to the cylindrical member There is an effect that it is possible to improve the reliability of the effect of suppressing the positional deviation of the portion and the second outer cylinder portion.

  In other words, the restricting projection as the restricting means is formed integrally with at least one of the first outer cylinder part or the second outer cylinder part, so that the restricting means is formed separately from the first outer cylinder part and the second outer cylinder part. Compared with the case where it is done, the number of parts can be reduced. As a result, it is possible to reduce the part cost and the assembly man-hour (installation man-hour for the vulcanization mold), and the product cost can be reduced accordingly.

  Further, when the restricting means is formed separately from the first outer cylinder part and the second outer cylinder part, the restricting means is provided between the divided surface of the first outer cylinder part and the divided surface of the second outer cylinder part. It is likely that the effect of suppressing displacement will not be exhibited due to the falling off and no restriction means being interposed between the divided surfaces. On the other hand, as in claim 3, if the restricting projections that are restricting means are integrally formed on at least one of the first outer cylinder part or the second outer cylinder part, the dividing surface of the first outer cylinder part and Since it is possible to maintain the interposed state without dropping the regulating means (regulating projection) between the split surfaces of the second outer cylinder portion, it is possible to reliably exert the effect of suppressing displacement and improve its reliability. Can do.

  Further, since the restricting projection is partially projected from at least one split surface of the first outer cylinder part or the second outer cylinder part, the first outer cylinder part and the second outer cylinder part are vulcanized by a vulcanization mold. (2) When connecting the outer cylinder part and the inner cylinder member by the first rubber part and the second rubber part, the dividing surface of the first rubber part and A vulcanization mold can be disposed between the divided surfaces of the second rubber part. Accordingly, a space is formed between the divided surface of the first rubber portion and the divided surface of the second rubber portion while the effect of suppressing the displacement of the first outer cylinder portion and the second outer cylinder portion can be exhibited by the restricting projection portion. There is an effect that can be done.

  According to the vibration isolator of claim 4, in addition to the effect produced by the vibration isolator according to claim 1 or 2, the vibration isolator is interposed between the split surface of the first outer cylinder part and the split surface of the second outer cylinder part. Since the interposed member is provided as a restricting means, the interposed member is a restricting means between the dividing surface of the first outer cylinder part and the dividing surface of the second outer cylinder part. The range in which the installation member is interposed can be almost the entire circumference in the circumferential direction. Therefore, there is an effect that it is possible to stably regulate the movement of the first outer cylinder portion and the second outer cylinder portion in the direction in which the divided surfaces are brought close to each other.

  Further, since the interposition member is divided into two parts by dividing two places whose phases are different by 180 degrees, or one part is divided, the dividing surface of the first outer cylinder part and the second outer cylinder part In the process of mounting and interposing an interposition member between the divided surfaces, there is an effect that the workability of the mounting operation can be improved.

  Further, since the interposed member as the regulating means is formed as a separate member from the first outer cylinder part and the second outer cylinder part, the gap between the first outer cylinder part and the second outer cylinder part and the inner cylinder member is formed. After the vulcanized molded body connected by the first rubber part and the second rubber part is vulcanized by a vulcanization mold, an interposed member is attached to the vulcanized mold. That is, in the structure of the vulcanization mold of the part that forms a space between the dividing surface of the first rubber part and the dividing surface of the second rubber part, it is not necessary to consider the shape of the interposed member. There is an effect that the structure of the mold can be simplified.

  According to the vibration isolator of claim 5, in addition to the effect of the vibration isolator according to claim 1 or 2, the cylindrical member has an inner peripheral surface portion at the center in the axial direction directed radially inward. A bulge formed and formed between the dividing surface of the first outer cylinder part and the dividing surface of the second outer cylinder part, and the restriction bulging part is used as a regulating means, so that it is lightweight. This has the effect of reducing the cost and product cost.

  In other words, the restriction bulging portion, which is the restriction means, is formed by deforming a part of the cylindrical member (bulging inward in the radial direction), and no additional member is required to constitute the restriction means. Therefore, the weight can be reduced accordingly. In addition, it is not necessary to add another member, and the number of parts is reduced, so that the part cost can be reduced and the assembling cost can be reduced, thereby reducing the product cost accordingly. be able to.

  Furthermore, since the restriction bulging portion, which is the restriction means, is formed on a cylindrical member that is a separate member from the first outer cylinder portion and the second outer cylinder portion, When a vulcanized molded body connected with a cylindrical member by a first rubber part and a second rubber part is vulcanized by a vulcanization mold, and then the cylindrical member is mounted for the vulcanization molding In addition, a restriction bulging portion is interposed. That is, in the structure of the vulcanization mold in the portion that forms a space between the dividing surface of the first rubber part and the dividing surface of the second rubber part, it is not necessary to consider the shape of the restriction bulging part. There is an effect that the structure of the metal mold can be simplified.

  According to the vibration isolator of claim 6, in addition to the effect of the vibration isolator according to any one of claims 1 to 5, the occurrence of peeling and cracking of the first rubber part and the second rubber part is suppressed. On the other hand, there is an effect that preliminary compression in the radial direction (perpendicular to the axis) can be imparted to the first rubber portion and the second rubber portion.

  Here, the vibration isolator imparts preliminary compression in the radial direction to the rubber base in order to ensure the durability thereof. The provision of the precompression in the radial direction to the rubber base is usually performed by drawing the outer cylinder member. In this case, in the structure in which a concave spherical surface is formed on the inner peripheral surface portion of the outer cylinder member (outer cylinder) as in the conventional product, the concave spherical surface and the concave spherical surface are not formed. A difference in thickness occurs between the portions and the thickness of the portion where the concave spherical surface is not formed becomes thick, so that drawing of the outer cylinder member becomes difficult.

  Therefore, in the conventional product, a plurality of concave grooves extending in the axial direction and having a depth equivalent to that of the concave spherical surface are formed on the inner peripheral surface of the outer cylinder member in the circumferential direction. As a result, the outer cylinder member undergoes drawing deformation so that the groove width of each concave groove becomes narrow with drawing, so there is a difference in thickness and the thickness of the portion where the concave spherical surface is not formed. Drawing can be performed even if the thickness is large.

  However, with this conventional product, the spring constant in the twisting direction can be reduced, but by forming a concave groove in the outer cylindrical member to enable drawing, the rubber base (rubber-like elastic body) can be pre-compressed. Since it is a structure to be applied, when the outer cylinder member is drawn, deformation concentrates on the concave groove, and the rubber-like elastic body is peeled off at the portion bonded to the concave groove, and the groove width is narrowed. Cracks are generated in the rubber substrate between the concave grooves.

  On the other hand, according to the sixth aspect, the first outer cylinder part and the second outer cylinder part are held and fixed by the cylindrical member in a state in which the first outer cylinder part and the second outer cylinder part are drawn. Therefore, there is an effect that preliminary compression in the radial direction can be applied to the first rubber portion and the second rubber portion. In addition, since the first outer cylinder part and the second outer cylinder part are formed from a material having a constant plate thickness into a shape having a concave inner peripheral surface, the first outer cylinder part and the second outer cylinder part can be drawn. It is not necessary to form a concave groove for Therefore, there is an effect that radial compression can be applied to the first rubber portion and the second rubber portion while suppressing occurrence of peeling and cracking of the first rubber portion and the second rubber portion.

  That is, in the present invention, since the cylindrical member holds and fixes the first outer cylinder part and the second outer cylinder part, the shape as an attachment site to the mating member (for example, press-fitting into the press-fitting hole of the suspension arm is possible. The outer shape) can be carried by the cylindrical member, and the first outer cylinder portion and the second outer cylinder portion do not need to take into account the shape as an attachment site to the mating member. Therefore, the first outer cylinder part and the second outer cylinder part can be formed from a material having a constant plate thickness, for example, by pressing, and as a result, the first outer cylinder part and the second outer cylinder part can be formed without providing a concave groove. The second outer cylinder portion can be drawn.

  According to the vibration isolator according to claim 7, in addition to the effect of the vibration isolator according to any one of claims 1 to 6, the cylindrical member is subjected to drawing processing, that is, the first outer cylinder portion. Since the first outer cylinder part and the second outer cylinder part are held and fixed by the cylindrical member by tightening the outer peripheral surface side of the second outer cylinder part by the inner peripheral surface side of the cylindrical member, the holding and fixing are performed. There is an effect that it can be performed easily. Further, since the inner diameter of the cylindrical member before the drawing process can be made larger than the outer diameters of the first outer cylinder part and the second outer cylinder part, the first outer cylinder part and the second outer cylinder in the assembly process. There is an effect that the operation of inserting the portion into the inner peripheral side of the tubular member along the axial direction can be efficiently performed.

  In this case, when the outer peripheral surface of the first outer cylinder part and the second outer cylinder part and the inner peripheral surface of the cylindrical member are in direct contact (that is, the metal materials are in contact with each other), the friction between the two It is difficult to secure the coefficient. Moreover, since the member located in the outer peripheral side becomes large, the spring back after a drawing process becomes difficult to ensure a fastening allowance. Therefore, there is a possibility that the first outer cylinder part and the second outer cylinder part may come out in the axial direction from the cylindrical member.

  On the other hand, in the present invention, a rubber film portion composed of a rubber-like elastic body is provided on at least a part of at least one of the outer peripheral surface of the first outer cylinder portion and the second outer cylinder portion or the inner peripheral surface of the cylindrical member. Since it is covered, the friction coefficient can be secured by the intervention of the rubber film portion. Further, the rubber film portion is interposed, so that the shortage of the tightening allowance due to the spring back of the cylindrical member can be compensated by the compressive force due to the elastic recovery of the rubber film portion. Therefore, there is an effect that it is possible to secure a holding force against the axial withdrawal and to prevent the first outer cylinder portion and the second outer cylinder portion from coming out of the cylindrical member in the axial direction.

  According to the seventh aspect, since the cylindrical member is drawn, the first outer cylindrical portion and the second outer cylindrical portion are radially arranged (perpendicular to the axis) on the inner peripheral side of the cylindrical member. There is an effect that it is possible to suppress rattling.

  According to the vibration isolator of claim 8, in addition to the effect of the vibration isolator according to any of claims 1 to 7, the cylindrical member is subjected to drawing processing, and the axial direction of the cylindrical member Since one end side and the other end side in the axial direction are formed in a shape reduced in diameter along the outer peripheral surface which is the back side of the concave inner peripheral surface of the first outer cylindrical portion and the second outer cylindrical portion, On the other hand, not only the movement of the first outer cylinder part and the second outer cylinder part in the direction in which the divided surfaces are brought close to each other but also the movement in the direction in which the divided surfaces are separated from each other can be restricted. There is an effect.

  That is, when the first outer cylinder part and the second outer cylinder part move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the regulating means, and is moved in the direction in which the divided surfaces are separated from each other. In that case, the movement can be restricted by one axial end side or the other axial end side of the cylindrical member. As a result, the movement in both directions can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member. Therefore, when a large displacement is input in the axial direction, the first outer cylinder portion or the second outer It is possible to reliably suppress the displacement of the tubular portion with respect to the tubular member.

(A) is a top view of the vibration isolator in 1st Embodiment of this invention, (b) is sectional drawing of the vibration isolator in the Ib-Ib line | wire of Fig.1 (a). (A) is a top view of an inner cylinder member, (b) is sectional drawing of the inner cylinder member in the IIb-IIb line | wire of Fig.2 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the IIIb-IIIb line | wire of Fig.3 (a). (A) is a top view of a cylindrical member, (b) is sectional drawing of the cylindrical member in the IVb-IVb line | wire of Fig.4 (a). (A) is a top view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the Vb-Vb line | wire of Fig.5 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of a vulcanization molded object and a cylindrical member in the state where a rubber base was compressed in the direction of an axis in a rubber base compression process, (b) is a cylindrical member in a cylindrical member squeezing process. It is sectional drawing of a vulcanization molded object and a cylindrical member in the state after drawing processing. (A) is sectional drawing of the vulcanization molded object and a cylindrical member in the state before a bending process is given in a bending process, (b) is in the state after a bending process was given in the bending process. It is sectional drawing of a vulcanization molded object and a cylindrical member. (A) is sectional drawing of the vulcanization molded object B which comprises the vibration isolator in 2nd Embodiment, (b) is sectional drawing of the vibration isolator in 2nd Embodiment. (A) is sectional drawing of the vulcanization molded object which comprises the vibration isolator in 3rd Embodiment, FIG.10 (b) is sectional drawing of the vibration isolator in 3rd Embodiment. (A) is a top view of the vibration isolator in 4th Embodiment, (b) is sectional drawing of the vibration isolator in the XIb-XIb line | wire of Fig.11 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the XIIb-XIIb line | wire of Fig.12 (a). It is a top view of an interposed member, (b) is sectional drawing of the interposed member in the XIIIb-XIIIb line | wire of Fig.13 (a). (A) is a side view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the XIVb-XIVb line | wire of Fig.14 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is sectional drawing of the vibration isolator in the state after the drawing process was given to the cylindrical member. (A) is a top view of the interposed member in 5th Embodiment, (b) is a top view of the interposed member in 6th Embodiment. (A) is a top view of the cylindrical member in 7th Embodiment, (b) is sectional drawing of the cylindrical member in the XVIIIb-XVIIIb line | wire of Fig.18 (a). (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is a fragmentary sectional view of the vibration isolator in the state after the drawing process was given to the cylindrical member. It is a figure which shows the vibration isolator in 8th Embodiment, (a) is a cross section of a vulcanization molded object and a cylindrical member in the state after a cylindrical member was drawn in the cylindrical member drawing process It is a figure and (b) is sectional drawing of the vibration isolator in the state after the bending process was given to the outer cylinder member in the bending process. (A) is a bottom view of the 1st outer cylinder part in 9th Embodiment, (b) is sectional drawing of the 1st outer cylinder part in the XXIb-XXIb line | wire of Fig.21 (a). (A) is a perspective view of an outer cylinder member, (b) is a side view of a vulcanization molded object. (A) is a top view of a vibration isolator, (b) is sectional drawing of the vibration isolator in the XXIIIb-XXIIIb line | wire of Fig.23 (a). (A) is a perspective view of the outer cylinder member in 10th Embodiment, (b) is a perspective view of the outer cylinder member in 11th Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the vibration isolator 100 will be described with reference to FIG. FIG. 1A is a top view of the vibration isolator 100 according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the vibration isolator 100 taken along the line Ib-Ib in FIG. FIG.

  As shown in FIG. 1, a vibration isolator 100 is a vibration isolating bush used for an automobile suspension device (suspension device), and is arranged on a cylindrical inner cylinder member 10 and an outer peripheral side of the inner cylinder member 10. The outer cylinder member 20 is provided, the inner cylinder member 10 and the outer cylinder member 20 are connected to each other, and the rubber base 30 formed of a rubber-like elastic body is disposed on the outer peripheral side of the outer cylinder member 20. And a tubular member 40 having a tubular shape.

  The vibration isolator 100 is configured such that the end surface in the axial O direction of the inner cylinder member 10 is clamped and fixed between a pair of clamping portions in the bracket of the suspension member via an attachment bolt inserted into the inner cylinder member 10. The shaped member 40 is press-fitted into a press-fitting hole at one end of the suspension arm (in this embodiment, the lower arm), and is thereby mounted on the suspension device of the automobile.

  Next, with reference to FIGS. 2 to 4, the detailed configuration of each part constituting the vibration isolator 100 will be described. First, with reference to FIG. 2, the detailed structure of the inner cylinder member 1 is demonstrated. 2A is a top view of the inner cylinder member 10, and FIG. 2B is a cross-sectional view of the inner cylinder member 10 taken along the line IIb-IIb in FIG. 2A.

  As shown in FIG. 2, the inner cylinder member 10 includes a cylindrical shaft part 11 in which an insertion hole through which a mounting bolt is inserted is formed along the axis O, and a radially outer side from the outer peripheral surface of the shaft part 11. And a spherical bulging portion 12 that bulges toward the direction, and these are integrally formed of a metal material. Note that the shaft portion 11 and the bulging portion 12 may be configured separately from different materials (for example, the bulging portion 12 is a resin material).

  The bulging portion 12 is disposed at the center of the shaft portion 11 in the axis O direction (the center in the vertical direction in FIG. 2B), and the center of the convex spherical surface of the bulging portion 12 is on the axis O of the shaft portion 11. To position. That is, the inner cylinder member 10 is formed in a rotationally symmetric shape with the axis O as the axis of symmetry (rotation center).

  With reference to FIG. 3, the detailed structure of the outer cylinder member 20 is demonstrated. Fig.3 (a) is a top view of the 1st outer cylinder part 21, FIG.3 (b) is sectional drawing of the 1st outer cylinder part 21 in the IIIb-IIIb line | wire of Fig.3 (a). FIG. 3 shows a state before the drawing process (see FIG. 6) in the outer cylinder drawing process.

  In addition, the outer cylinder member 20 is divided into two at the center part in the axis O direction into a first outer cylinder part 21 and a second outer cylinder part 22 (see FIG. 1). Since the first outer cylinder portion 21 and the second outer cylinder portion 22 are the same member (configuration) and are different only in names, the first outer cylinder portion 21 will be described below. Description of the 2 outer cylinder part 22 is abbreviate | omitted.

  As shown in FIG. 3, the first outer cylinder portion 21 is a member obtained by forming a plate-like metal material (steel material in the present embodiment) with a constant plate thickness into a vessel shape by pressing, It is formed in rotational symmetry with the axis O as the axis of symmetry (rotation center).

  In addition, since the 1st outer cylinder part 21 is formed from a raw material with a fixed plate | board thickness, it is not necessary to form the ditch | groove for enabling drawing like the conventional product. Therefore, in the outer cylinder drawing process (see FIG. 6) in which the first outer cylinder portion 21 and the second outer cylinder portion 22 are drawn, the occurrence of peeling and cracking of the first rubber portion 31 and the second rubber portion 32 is suppressed. However, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the first rubber portion 31 and the second rubber portion 32.

  That is, since the first outer cylinder portion 21 (and the second outer cylinder portion 22) is held and fixed to the cylindrical member 40 (see FIG. 1), the shape (this embodiment) as an attachment site to the counterpart member Then, the cylindrical member 40 can be made to bear the outer shape that can be press-fitted into the press-fitting hole of the lower arm, and the first outer cylinder portion 21 does not need to consider the shape as an attachment site to the counterpart member. Therefore, the 1st outer cylinder part 21 can be shape | molded by a press work from the raw material with fixed board thickness, As a result, even if it does not provide a ditch | groove, the 1st outer cylinder part 21 (and 2nd outer cylinder) Part 22) can be drawn.

  The first outer cylinder portion 21 includes an annular portion 20a formed in an annular plate shape orthogonal to the axis O, a curved portion 20b that is connected to the inner edge of the annular portion 20a and whose cross-sectional shape is curved in an arc shape, A conical cylindrical enlarged portion 20c that is connected to the end of the curved portion 20b (lower side in FIG. 3 (b)) and is spaced apart from the curved portion 20b so that the inner diameter is gradually enlarged, and the largest diameter side of the enlarged portion 20c And a cylindrical portion 20d having a substantially constant inner diameter, and these portions 20a to 20d are integrally formed coaxially along the axis O.

  The enlarged diameter portion 20c and the cylindrical portion 20d are smoothly connected in a circular arc shape in cross section. Further, when the annular portion 20a is formed in an annular plate shape orthogonal to the axis O, and the end portion in the axis O direction of the cylindrical member 40 is bent radially inward in a bending step (see FIG. 8) described later. The bent portion overlaps the annular portion 20a in the direction of the axis O (see FIG. 1). Therefore, the engagement between the bent portion of the tubular member 40 and the annular portion 20a can be strengthened.

  Here, the inner peripheral surfaces of the enlarged diameter portion 20c and the cylindrical portion 20d are defined as the concave inner peripheral surface IS. The concave inner peripheral surface IS is a portion surrounding the bulging portion 12 of the inner cylinder member 10, and the enlarged diameter portion 20c and the cylindrical portion 20d are drawn (drawn and deformed) in the outer cylinder drawing step (see FIG. 6). Thus, the shape of the concave inner peripheral surface IS is formed into a concave spherical surface concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10 (see FIG. 1).

  In the present embodiment, as shown in FIG. 3, the outer diameter of the annular portion 20a (the diameter at the outer edge of the annular portion 20a) D1 is the outer diameter of the cylindrical portion 20d (the diameter of the outer peripheral surface of the cylindrical portion 20d) D2. (D1 <D2). Thereby, in the outer cylinder drawing step (see FIG. 6), only the portion of the cylindrical portion 20d can be brought into contact with a die piece (not shown) and can be pressed (moved) radially inward by the die piece. Therefore, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  The cylindrical member 40 will be described with reference to FIG. 4A is a top view of the tubular member 40, and FIG. 4B is a cross-sectional view of the tubular member 40 taken along line IVb-IVb of FIG. 4A. 4 shows a state before the cylindrical member drawing step (see FIG. 7) (that is, the cylindrical member 40 before drawing).

  As shown in FIG. 4, the cylindrical member 40 is a member formed in a cylindrical shape having an axis O from a metal material (a steel material in the present embodiment). That is, the cylindrical member 40 is formed in a shape that is rotationally symmetric with the axis O as the axis of symmetry (rotation axis).

  The inner diameter of the cylindrical member 40 is the maximum outer diameter of the vulcanized molded body A after the drawing process (see FIG. 6B) in the outer cylinder drawing process described later (the outer peripheral surfaces of the rubber film portions 33 and 34). Larger than the diameter). In the present embodiment, it is made larger than the maximum outer diameter (outer diameter D2 of the cylindrical portion 20d) of the vulcanized molded body A before drawing. Thereby, in the assembly work of the vibration isolator 100, the work of inserting the vulcanized molded body A into the inner peripheral side of the tubular member 40 along the axis O direction can be efficiently performed (FIG. 7A). reference).

  Further, at the end of the cylindrical member 40 in the axis O direction (the vertical direction in FIG. 4 (b)), a chamfering process is performed on a corner portion on the inner peripheral surface side to form a chamfered surface 40a having a linear cross section. The formation of the chamfered surface 40a can also improve the workability of inserting the vulcanized molded body A along the axis O direction into the inner peripheral side of the cylindrical member 40. Furthermore, by providing the chamfered surface 40a, it is possible to easily bend the end portion in the axial O direction of the tubular member 40 radially inward in a bending step (see FIG. 8) described later.

  Next, a method for manufacturing the vibration isolator 100 will be described with reference to FIGS. First, with reference to FIG. 5, the manufacturing method of the vulcanization molded object A is demonstrated, and the structure of the rubber base | substrate 30 is demonstrated collectively. 5A is a top view of the vulcanized molded body A, and FIG. 5B is a cross-sectional view of the vulcanized molded body A taken along the line Vb-Vb in FIG. 5A.

  As shown in FIG. 5, the vulcanized molded body A is a part molded by a vulcanization mold and constitutes one element of the vibration isolator 100. That is, the vibration isolator 100 is configured by mounting the tubular member 40 on the vulcanized molded body A. The vulcanized molded body A is manufactured by placing the inner cylinder member 10 and the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) in a vulcanization mold, and after clamping the mold, a rubber material And the rubber substrate 30 is vulcanized and molded. Thereby, the outer peripheral surface of the inner cylindrical member 10 and the inner peripheral surface of the outer cylindrical member 20 (the first outer cylindrical portion 21 and the second outer cylindrical portion 22) are connected by the rubber base 30, and the vulcanized molded body A Is manufactured.

  In addition, the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 are coaxially installed in a vulcanization metal mold | die with the attitude | position which mutually faced the cylindrical parts 20d. The vulcanization mold includes an intermediate mold located in the center of the inner cylinder member 10 in the direction of the axis O (the vertical direction in FIG. 5 (b)). The intermediate mold has an annular shape after clamping, The inner peripheral front end edge of the middle mold is in close contact with the outer peripheral surface of the bulging portion 12 and the top of the spherical surface.

  Thereby, the middle type is interposed between the split surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22, so that the first outer cylinder portion 21 and the second outer cylinder portion 22 have their split surfaces ( The end portion of the cylindrical portion 20d in the axis O direction and the lower side surface of FIG. 3 (b) are placed in the vulcanization mold in a state of being separated in the direction of the axis O, and the rubber base 30 includes the first rubber portion 31 and the second rubber. It is vulcanized and molded into a portion 32 divided into two in the direction of the axis O. That is, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) of the vulcanized molded body A has a split surface of the first outer cylinder portion 21 and a split surface of the second outer cylinder portion 21 in the axis O direction. And a state in which a predetermined interval is provided.

  The first rubber portion 31 is a portion that connects the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the concave inner peripheral surface IS of the first outer cylinder portion 21, and the second rubber portion 32 is the inner cylinder member 10. This is a portion for connecting the outer peripheral surface of the bulging portion 12 and the concave inner peripheral surface IS in the second outer cylindrical portion 22. The first rubber part 31 and the second rubber part 32 are disposed with a predetermined interval between the divided surfaces. The interval between the divided surfaces is formed so as to become narrower from the first outer cylinder portion 21 and the second outer cylinder portion 22 toward the bulging portion 12 of the inner cylinder member 10.

  The first rubber part 31 and the second rubber part 32 do not have to be completely divided (divided) in the axis O direction. For example, even if the first rubber part 31 and the second rubber part 32 are connected by a part (for example, a film-like body) of the rubber base 30 that covers the outer peripheral surface of the bulging part 12 of the inner cylinder member 10. good.

  The rubber base 30 includes rubber film portions 33 and 34 that are covered on the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The rubber film portions 33 and 34 are portions that form a circular outer peripheral surface with the axis O as the center, and are formed in a range from the annular portion 20a to the middle of the conical portion 20c, and the annular portion 20a. Are connected to the first rubber part 31 or the second rubber part 32 via the upper or lower surface (for example, the upper side surface of FIG. 5B in the case of the rubber film 33) and the inner peripheral surface of the curved part 20b.

  In the present embodiment, as shown in FIG. 5, the outer diameter of the rubber film portions 33, 34 (the diameter on the outer peripheral surface of the rubber film portions 33, 34) D3 is the outer diameter of the cylindrical portion 20d (cylindrical portion 20d). Is smaller than D2 (D3 <D2).

  Here, the covering range of the rubber film portions 33 and 34 is a range up to the middle of the conical portion 20c, and the rubber film portion 33 and the remaining portion of the conical portion 20c on the cylindrical portion 20d side are disposed on the cylindrical portion 20d. 34 is not covered (that is, the outer peripheral surface is exposed). Thus, in the outer cylinder drawing step (see FIG. 6), the cylindrical portion 20d and the conical portion 20c can be directly pressed by the drawing die (not shown) without using the rubber film portions 33 and 34. The drawing process can be performed with high accuracy.

  The rubber film portions 33 and 34 are provided with receiving recesses 33a and 34a that are recessed from the outer peripheral surface thereof toward the conical portion 20c and are located on the cylindrical portion 20d side. As a result, the contact area between the vulcanization mold and the conical portion 20c can be secured and the sealing performance at the time of vulcanization molding can be improved, so that the rubber film portions 33 and 34 are formed on the outer peripheral surface of the cylindrical portion 20d. Can be suppressed. In addition, by providing the receiving recesses 33a and 34a, a space is formed between the inner peripheral surface of the cylindrical member 40 and the outer peripheral surface of the conical portion 20c in the cylindrical member drawing step (see FIG. 7). In the space, the rubber film portions 33 and 34 that have become surplus can be received.

  An assembly method for assembling the vibration isolator 100 from the vulcanized molded body A and the tubular member 40 will be described with reference to FIGS. The vibration isolator 100 is assembled by an outer cylinder drawing step (see FIG. 6) for drawing the outer cylinder member 20 (first outer cylinder portion 21 and second outer cylinder portion 22), and a rubber base 30 (first rubber portion). 31 and the second rubber portion 32) in the direction of the axis O, a rubber base compression step (see FIG. 7), a cylindrical member drawing step for drawing the cylindrical member 40 (see FIG. 7), and a cylindrical member This is performed by sequentially performing a bending step (see FIG. 8) for bending the end portions of the 40 axis O directions.

  The outer cylinder drawing process will be described with reference to FIG. FIG. 6A is a cross-sectional view of the vulcanized molded body A in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 6B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding A in the state.

  The drawing die for drawing the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) is an annular die and an annular shape that holds and guides the annular die from the outer peripheral side. (All are not shown). The die is divided into a plurality of die pieces in the circumferential direction, and a tapered surface is formed on the outer peripheral surface. The holder has a tapered surface corresponding to the tapered surface of the die formed on the inner periphery.

  In the outer cylinder drawing step, the die is held by a holder installed on the table of the press device, the vulcanized molded body A is set on the inner peripheral side of the die, and then the die is pressed against the holder by the pressing force of the press device. To move relative. By such relative movement, each die piece is guided radially by the taper surface of the inner peripheral surface of the holder to the axial center O of the vulcanized molded body A toward the axis O. Are moved closer to each other and the diameter of the die is reduced.

  Thereby, as shown in FIG.6 (b), the outer peripheral surface of the cylindrical part 20d of the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 presses radially inward by the inner peripheral surface of each die piece. Then, the first outer cylinder part 21 and the second outer cylinder part 22 are drawn.

  By this outer cylinder drawing process, the cylindrical part 20d of the first outer cylinder part 21 and the second outer cylinder part 22 is reduced in diameter from the outer diameter D2 to the outer diameter D4 (D4 <D2). Thereby, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the rubber base 30 (the first rubber portion 31 and the second rubber portion 32).

  Further, as the diameter of the cylindrical portion 20d is reduced, the conical portion 20c and the cylindrical portion 20d are drawn and deformed so as to be bent radially inward with the curved portion 20b as a fulcrum. Is curved. As a result, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 12 of the inner cylinder member 10.

  In the present embodiment, the outer diameter D2 is 53.6 mm, and the outer diameter D4 is 52.0 mm. Further, the outer diameter D4 is made smaller than the outer diameter D3 (see FIG. 5) of the rubber film portions 33 and 34 (D4 <D3). That is, in the vulcanized molded body A shown in FIG. 6B after the outer cylinder drawing process is performed, the rubber film portions 33 and 34 have a larger diameter than the cylindrical portion 20d, and the rubber film portions 33 and 34 are formed. The outer peripheral surface is disposed radially outward (a position spaced apart from the axis O) from the outer peripheral surface of the cylindrical portion 20d.

  With reference to FIG. 7, a rubber base | substrate compression process and a cylindrical member squeezing process are demonstrated. FIG. 7A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state where the rubber base 30 is compressed in the axis O direction in the rubber base compression step, and FIG. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after the drawing process was given to the cylindrical member 40 in the member drawing process.

  As shown in FIG. 7A, in the rubber base compression process, first, the vulcanized molded body A is inserted into the cylindrical member 40 along the direction of the axis O, and the vulcanized molded body A is inserted into the cylindrical member 40. Install on the circumference side. Subsequently, the first outer cylinder portion 21 and the second outer cylinder portion 22 of the vulcanized molded body A are divided into the split surfaces of both the outer cylinder portions 21 and 22 (the end surface in the axis O direction of the cylindrical portion 20d, FIG. 3B lower). Side surface) Relatively move in the direction of axis O so that they are close to each other.

  Specifically, the annular part 20a of the first outer cylinder part 21 and the annular part 20a of the second outer cylinder part 22 are sandwiched between the end surfaces of the pair of cylindrical jigs J, and the upper jig J is placed on the lower side. Push down toward the jig J by a predetermined amount in the direction of the axis O. In the present embodiment, as shown in FIG. 7A, a predetermined gap is formed between the divided surface of the first outer cylinder part 21 and the divided surface of the second outer cylinder part 22. The pair of jigs J is fixed.

  As shown in FIG. 7B, the drawing of the tubular member 40 by the tubular member drawing step is performed with the pair of jigs J fixed (that is, the rubber base 30 (the first rubber portion 31 and the second rubber member 30). The rubber part 32) is carried out while maintaining the state compressed in the direction of the axis O). The configuration of the drawing die for drawing the cylindrical member 40 and the operation thereof are the same as those of the drawing die used in the outer cylinder drawing step, and the description thereof will be omitted.

  Here, the drawing of the cylindrical member 40 is performed by pressing the cylindrical portion 20d of the first outer cylindrical portion 21 and the second outer cylindrical portion 22 inward in the radial direction by the inner peripheral surface of the cylindrical member 40. By giving a predetermined fastening allowance (in the present embodiment, about 0.01 mm to 0.02 mm in radius) to the part 20d, the first outer cylinder part 21 and the second outer cylinder part 22 are placed in the cylindrical member 40. The purpose is to hold on. In this way, the tightening margin is set to a small value, and drawing can be performed by the operation of the drawing die with a relatively low pressure, so that the press device can be downsized. In this case, as will be described later, the inner peripheral surface of the tubular member 40 and the rubber film portions 33 and 34 are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 33 and 34.

  The bending process will be described with reference to FIG. FIG. 8A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state before the bending process is performed in the bending process, and FIG. 8B is a diagram illustrating the bending process performed in the bending process. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after being done.

  The caulking die for bending the end of the cylindrical member 40 in the axis O direction includes a pair of annular dies and a holder that holds the pair of dies so as to be movable in the axis O direction. On the opposing surfaces of the pair of dies, a curved concave portion, which is a concave portion in which a cross-sectional shape cut along a plane including the axis O curves in a circular arc shape, is recessed at a portion where the end portion in the axial O direction of the cylindrical member 40 abuts. Established.

  In the bending process, after the vulcanized molded body A and the cylindrical member 40 in the state shown in FIG. 8A are set between a pair of dies of a caulking die installed on a table of the press apparatus, The pair of dies are moved relative to each other in the direction approaching each other by the applied pressure. With this relative movement, the end portion in the axis O direction of the tubular member 40 is deformed along the inner surface shape of the curved concave portion of the die and bent toward the radially inward side. As a result, as shown in FIG. 8B, the tubular member 40 is attached to the vulcanized molded body A, and the assembly thereof (manufacture of the vibration isolator 100) is completed.

  Here, the cylindrical member 40 has been subjected to the drawing process in the cylindrical member drawing step described above (see FIG. 7), so that the pair of jigs J are removed as shown in FIG. Even in this state, the first outer cylinder part 21 and the second outer cylinder part 22 can be held on the inner peripheral side.

  In this case, when the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22 and the inner peripheral surface of the cylindrical member 40 are in direct contact (that is, the metal materials are in contact with each other), It is difficult to ensure the coefficient of friction. Further, since the spring back after the drawing process is enlarged by the cylindrical member 40 located on the outer peripheral side, it is difficult to secure the tightening allowance. Therefore, the first outer cylinder portion 21 and the second outer cylinder portion 22 may come out from the cylindrical member 40 in the axis O direction.

  On the other hand, in the present embodiment, rubber film portions 33 and 34 made of a rubber-like elastic body are covered on part of the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The friction coefficient can be secured by the intervention of the rubber film portion. Further, the rubber film portions 33 and 34 are interposed, so that the shortage of the tightening allowance due to the spring back of the tubular member 40 can be compensated by the compression force due to the elastic recovery of the rubber film portions 33 and 34. Therefore, it is possible to secure a holding force against the withdrawal in the axis O direction, and to prevent the first outer cylinder portion 21 and the second outer cylinder portion 22 from coming out of the cylindrical member 40 in the axis O direction. Thereby, the caulking die used in the bending process does not need to consider the relationship with the jig J (that is, the bending process can be performed with the jig J removed). It can be simplified.

  In addition, even if the first outer cylinder portion 21 and the second outer cylinder portion 22 are slightly shifted in the direction of the axis O (moved in the direction of withdrawal) by removing the pair of jigs J, When bending the axial O-direction end of the cylindrical member 40 in the bending step, the bent portions are used to push back the first outer cylindrical portion 21 and the second outer cylindrical portion 22 to define the position in the axial O direction. (Can be placed at an appropriate position).

  In addition, the cylindrical member 40 is subjected to drawing processing, and the inner peripheral surface thereof is in close contact with the first outer cylinder portion 21 and the second outer cylinder portion 22 and the rubber film portions 33 and 34, thereby preventing vibration. When the apparatus 100 is used, the vulcanized molded body A can be prevented from rattling in the radial direction (perpendicular to the axis O) on the inner peripheral side of the tubular member 40.

  As described above, according to the vibration isolator 100, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) includes the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the outer cylinder member 20 ( Since the connection is made between the concave inner peripheral surface IS of the first outer cylinder portion 21 and the second outer cylinder portion 22) (that is, the concentric concave spherical surface surrounding the bulging portion 12 of the inner cylinder member 10). In response to the input of the directional displacement, the rubber base 30 can be deformed mainly in the shearing direction. Therefore, the spring constant in the twisting direction of the vibration isolator 100 can be reduced.

  In this case, in the vulcanized molded body A, the division surface of the first outer cylinder portion 21 and the division surface of the second outer cylinder portion 22 are separated in the axis O direction by a vulcanization process (with a predetermined interval). ), The first rubber portion 31 and the second rubber portion 32 are vulcanized (see FIG. 6A). The vulcanized molded body A vulcanized and molded in such a form has a rubber base compression step (see FIGS. 6B and 7A) and a cylindrical member squeezing step (FIGS. 7A and 7). (B)) and the bending process (see FIGS. 8A and 8B), the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the axis O direction and divided. It is held and fixed by the cylindrical member 40 in a state where the surfaces are close to each other. Thereby, preliminary compression in the direction of the axis O can be applied to the first rubber part 31 and the second rubber part 32.

  Note that such provision of pre-compression in the direction of the axis O is impossible with a structure that uses the reduced diameter of the outer cylinder member that accompanies drawing as in the conventional product, and is similar to that of the vibration isolator 100. In addition, the first outer cylinder part 21 and the second outer cylinder part 22 that are relatively moved in the direction of the axis O can be provided only by adopting a structure in which the cylindrical member 40 holds and fixes the first outer cylinder part 21 and the second outer cylinder part 22. Thereby, the spring constant in the direction of the axis O can be increased, and the durability against the displacement in the direction of the axis O can be improved.

  Further, according to the vibration isolator 100, as described above, the vulcanized molded body A has the divided surface of the first outer cylinder part 21 and the divided surface of the second outer cylinder part 22 separated in the axis O direction. Vulcanization molding is performed in a state (with a predetermined interval) (see FIG. 6A), and after the vulcanization molding, the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the direction of the axis O. (Refer to FIG. 6B and FIG. 7A) Since it is configured to be held and fixed by the cylindrical member 40 (see FIG. 8B), it is between the first outer cylinder portion 21 and the second outer cylinder portion 22. The relative distance in the axis O direction (that is, the separation distance in the axis O direction between the split surfaces when held and fixed to the cylindrical member 40 (the vertical distance in FIG. 8B)) can be adjusted. Thereby, since the amount of preliminary compression in the direction of the axis O applied to the first rubber part 31 and the second rubber part 32 can be adjusted, the value of the spring constant in the direction of the axis O can be increased or decreased.

  In this case, it is necessary to adjust the amount of bending deformation of the end portion in the axis O direction of the cylindrical member 40, and the shape of the curved concave portion of the caulking die used in the bending step (see FIG. 8) is adjusted. . When the amount of bending deformation (shape of the curved concave portion) is insufficient, the dimension of the tubular member 40 in the axis O direction is changed.

  Next, a vibration isolator 200 according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted. FIG. 9A is a cross-sectional view of the vulcanized molded body B constituting the vibration isolator 200 in the second embodiment, and FIG. 9B is a cross section of the vibration isolator 200 in the second embodiment. FIG. 9A shows the vulcanized molded body B in a state before the outer cylinder member 20 is drawn by the outer cylinder drawing step.

  The vulcanized molded body B in the second embodiment has other configurations except that the configuration (formation range) of the rubber film portions 233 and 234 is different from the configuration of the rubber film portions 33 and 34 in the first embodiment. Is the same as the vulcanized molded product A in the first embodiment. The method for manufacturing the vibration isolator 200 is the same as that for the vibration isolator 100. Therefore, these descriptions are omitted.

  As shown in FIG. 9A, the rubber film portions 233 and 234 in the second embodiment are covered over the entire outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. That is, the covering range of the rubber film portions 33 and 34 in the first embodiment is a range extending from the annular portion 20a to the middle of the conical portion 20c (see FIG. 5B). The range is extended, and the rubber film portions 233 and 234 are also covered on the outer peripheral surface of the conical portion 20c and the outer peripheral surface of the cylindrical portion 20d.

  The rubber film portions 233 and 234 form a circular outer peripheral surface with the axis O as the center, as in the case of the first embodiment. The outer diameters of these rubber film parts 233 and 234 (the diameters on the outer peripheral surfaces of the rubber film parts 233 and 234) are made smaller than the inner diameter of the tubular member 40.

  According to the vibration isolator 200 in the second embodiment, the contact area with the inner peripheral surface of the tubular member 40 can be increased by expanding the covering range of the rubber film portions 233 and 234. Accordingly, the holding force of the vulcanized molded body B by the cylindrical member 40 can be secured, and therefore, after the cylindrical member 40 is drawn by the cylindrical member drawing process, the process proceeds to the bending process (see FIG. 8), it is possible to more reliably suppress the vulcanized molded body B from coming out in the direction of the axis O from the inner peripheral side of the tubular member 40.

  Next, a vibration isolator 300 according to the third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted. FIG. 10A is a cross-sectional view of the vulcanized molded body C constituting the vibration isolator 300 in the third embodiment, and FIG. 10B is a cross section of the vibration isolator 300 in the third embodiment. FIG.

  In the vulcanized molded body C in the third embodiment, the configuration of the first outer cylinder part 321 and the second outer cylinder part 322 is the same as that of the first outer cylinder part 21 and the second outer cylinder part 22 in the first embodiment. Except for the differences from the configuration, the other configurations are the same as those of the vulcanized molded body A in the first embodiment. However, the rubber film portions 233 and 234 are the same as the vulcanized molded body B in the second embodiment. The manufacturing method of the vibration isolator 300 is the same as that of the vibration isolator 100 except that the outer cylinder drawing step (see FIG. 6, drawing of the outer cylinder member 320) is omitted. . Therefore, these descriptions are omitted.

  As shown in FIG. 10 (a), the outer cylinder member 320 in the third embodiment is a solid member (a member made of aluminum die casting in the present embodiment) formed by casting, and on the inner peripheral side. A concave inner peripheral surface IS formed as a concave spherical surface is provided, and is divided into a first outer cylindrical portion 321 and a second outer cylindrical portion 322 at the central portion in the axis O direction of the concave inner peripheral surface IS. The first outer cylinder part 321 and the second outer cylinder part 322 are the same member (configuration).

  In the vulcanized molded body C, the divided surface of the first outer cylinder portion 321 and the divided surface of the second outer cylinder portion 322 are spaced apart in the axis O direction as in the case of the vulcanized molded body A in the first embodiment. Then, it is vulcanized and formed at a predetermined interval. The concave inner circumferential surface IS is formed so that the first outer cylinder part 321 and the second outer cylinder part 322 are close to each other in the divided surfaces of the outer cylinder parts 321 and 322 in the rubber base compression process (see FIG. 7). Further, by being relatively moved in the direction of the axis O, a convex spherical surface is formed concentrically with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  According to the vibration isolator 300, the rubber base 30 (the first rubber part 31 and the second rubber part 32) can be mainly deformed in the shearing direction in response to the input of the displacement in the twisting direction. The spring constant at can be reduced.

  Further, since the first outer cylinder part 321 and the second outer cylinder part 322 are relatively moved in the direction of the axis O and the divided surfaces are brought close to each other, the first outer cylinder part 321 and the second outer cylinder part 322 are held and fixed by the cylindrical member 40. Preliminary compression in the direction of the axis O can be applied to the part 31 and the second rubber part 32.

  That is, even if the outer cylinder member 320 (the first outer cylinder portion 321 and the second outer cylinder portion 322) has a shape that cannot be subjected to drawing processing (diameter reduction processing), the first rubber portion 31 and the second rubber portion 31 are provided. By preliminarily compressing the rubber part 32 in the axis O direction, the spring constant in the axis O direction can be increased, and durability against displacement in the axis O direction can be improved.

  Next, a vibration isolator 400 according to the fourth embodiment will be described with reference to FIGS. FIG. 11A is a top view of the vibration isolator 400 according to the fourth embodiment, and FIG. 11B is a cross-sectional view of the vibration isolator 400 taken along the line XIb-XIb in FIG. . In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  As shown in FIG. 11, the inner cylinder member 410 is a member formed in a rotationally symmetric shape having an axis O as a symmetric axis (rotation center), and a cylindrical shape in which an insertion hole is formed through the axis O. A shaft portion 411 and a spherical bulging portion 412 that bulges radially outward from the outer peripheral surface of the shaft portion 411 are formed integrally from a metal material. The bulging portion 412 is disposed in the center of the shaft portion 411 in the axis O direction (the center in the vertical direction in FIG. 11B), and the center of the convex spherical surface of the bulging portion 412 is on the axis O of the shaft portion 411. To position.

  The outer cylinder member 420 is divided into a first outer cylinder part 421 and a second outer cylinder part 422 at the center in the axis O direction. Here, with reference to FIG. 12, the detailed structure of the outer cylinder member 420 is demonstrated. In addition, since the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 are the same members (structure), and are only members from which a name differs, the 1st outer cylinder part 421 is demonstrated below, The description of the second outer cylinder portion 422 is omitted.

  12A is a top view of the first outer cylinder portion 421, and FIG. 12B is a cross-sectional view of the first outer cylinder portion 421 taken along the line XIIb-XIIb of FIG. 12A. FIG. 12 shows a state before drawing (see FIG. 15) in the outer cylinder drawing process.

  As shown in FIG. 12, the first outer cylinder portion 421 is a member obtained by forming a plate-like metal material (steel material in the present embodiment) having a constant plate thickness into a container shape by pressing, It is formed in rotational symmetry with the axis O as the axis of symmetry (rotation center). In addition, the point which does not need to form the ditch | groove for enabling a drawing process like the conventional product with respect to the 1st outer cylinder part 421, and the effect are the 1st outer cylinder parts 21 in 1st Embodiment. Since this is the same, the description thereof is omitted.

  The first outer cylinder portion 421 is located on one end side in the axis O direction (upper side in FIG. 12B), and has a cylindrical portion having a substantially constant diameter (inner diameter and outer diameter), and the cylindrical portion. And the diameter is gradually enlarged toward the dividing surface (lower end surface in FIG. 12 (b)) and the cross-sectional shape is curved in an arc shape.

  The first outer cylinder portion 421 has an inner diameter dimension of the cylindrical portion (that is, an opening at the end of the first outer cylinder portion 421 in the direction of the axis O in the state before being drawn by an outer cylinder drawing step described later). The minimum inner diameter dimension in FIG. 12B (upper side) is made smaller than the maximum outer diameter dimension in the bulging portion 412 of the inner cylinder member 410 (see FIG. 13B).

  A plurality of (four in the present embodiment) through-holes 421a are formed through the region where the cross-sectional shape is curved in an arc shape at regular intervals in the circumferential direction. Further, the inner peripheral surface of the portion curved in an arc shape is a concave inner peripheral surface IS surrounding the bulging portion 412 of the inner cylinder member 410. The concave inner circumferential surface IS is brought closer to the concave spherical surface concentric with the convex spherical surface in the bulging portion 412 of the inner cylindrical member 410 by performing drawing in the outer cylindrical drawing step (see FIG. 14). It is done.

  Returning to FIG. The cylindrical member 440 has the same configuration as that of the cylindrical member 40 in the first embodiment except that the formation of the chamfered surface 40a is omitted (see FIGS. 4 and 16A). Is omitted. In addition, in FIG. 11, the cylindrical member 440 after drawing by the cylindrical member drawing process (refer FIG. 16) is illustrated.

  An interposed member 450 is interposed between the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422. The interposed member 450 is a member for restricting the first outer cylinder part 421 and the second outer cylinder part 422 from moving in the direction in which the divided surfaces are brought close to each other in the cylindrical member 440. Here, with reference to FIG. 13, the detailed structure of the interposed member 450 is demonstrated.

  13A is a top view of the interposed member 450, and FIG. 13B is a cross-sectional view of the interposed member 450 taken along line XIIIb-XIIIb in FIG. In FIG. 13, for easy understanding, a state where the two divided members (interposition members 450) are separated from each other is illustrated.

  As shown in FIG. 13, the interposition member 450 is a member formed in a cylindrical shape from a metal material (in this embodiment, a steel material), and has two phases (FIG. 13A) whose phases are different by 180 degrees. The upper part and the lower part are divided into two parts. Therefore, since the two members constituting the interposed member 450 have the same shape (configuration), the types of components can be reduced accordingly.

  The plate thickness dimension of the interposed member 450 is set to the same plate thickness dimension as the outer cylinder member 420 (the first outer cylinder portion 421 and the second outer cylinder portion 422), and two members constituting the interposed member 450 The diameter (inner diameter and outer diameter) of the cylinder obtained by bringing the divided surfaces into contact with each other is the diameter (the lower side surface in FIG. 12 (b)) of the first outer cylinder portion 421 and the second outer cylinder portion 422. The inner diameter and the outer diameter). Therefore, in the assembled state of the vibration isolator 400, the end surface of the interposed member 450 faces the split surface of the first outer cylinder portion 421 and the second outer cylinder portion 422, and is described later on the inner peripheral surface side of the interposed member 450. A space SP is secured (see FIG. 11B).

  Next, a method for manufacturing the vibration isolator 400 will be described with reference to FIGS. First, with reference to FIG. 14, the manufacturing method of the vulcanization molded object D is demonstrated, and the structure of the rubber base | substrate 430 is also demonstrated. FIG. 14A is a side view of the vulcanized molded body D, and FIG. 14B is a cross-sectional view of the vulcanized molded body D along the line XIVb-XIVb in FIG. 14A.

  As shown in FIG. 14, the vulcanized molded body D includes an inner cylinder member 410 and an outer cylinder member 420 (a first outer cylinder part 421 and a second outer cylinder part 422), as in the case of the first embodiment. Is installed in the vulcanization mold, and the rubber base 430 (the first rubber portion 431 and the second rubber portion 432) is vulcanized to form the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 420 (first outer cylinder). The part 421 and the inner peripheral surface of the second outer cylinder part 422) are connected by a rubber base 430 to be manufactured.

  In this case, the vulcanization mold is provided with an intermediate mold that is located in the center of the inner cylinder member 410 in the direction of the axis O (the vertical direction in FIG. 14 (b)) and has an annular shape after the mold clamping. The inner peripheral front end edge of the middle mold faces the outer circumferential surface (top) of the bulging portion 412 with a predetermined interval, and the upper and lower surfaces of the middle mold are the first outer cylinder portion 421 and the second outer cylinder portion 422. Support the split surface. In addition, the support part (not shown) by the middle mold | type of this division surface is intermittently arrange | positioned in the circumferential direction.

  Due to the intermediate mold, the first outer cylinder part 421 and the second outer cylinder part 422 are installed in the vulcanization mold with their divided surfaces spaced apart in the direction of the axis O, and the rubber base 430 is the first rubber. The part 431 and the second rubber part 432 are vulcanized and molded into two parts in the direction of the axis O. That is, the vulcanized molded body D has a space between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432 (and the dividing surface of the first outer cylinder portion 421 and the division of the second outer cylinder portion 422). A space SP having a shape corresponding to the middle size (in the present embodiment, a U-shaped cross section) is formed between the two surfaces.

  The first rubber portion 431 is a portion that connects the outer peripheral surface of the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the first outer cylindrical portion 421, and the second rubber portion 432 is the inner cylindrical member 410. The outer peripheral surface of the bulging portion 412 and the concave inner peripheral surface IS in the second outer cylinder portion 422 are connected to each other.

  The rubber base 430 includes rubber film portions 431 a and 431 b that are covered on the outer peripheral surface of the first outer cylinder portion 421. The rubber film portions 431a and 431b are two belt-like films that are continuous in the circumferential direction. The rubber film portion 431a is passed through the through hole 421a of the first outer cylinder portion 421, and the rubber film portion 431b is the first outer cylinder. The first rubber portions 431 are connected to each other through the dividing surface of the portion 421.

  In the present embodiment, since the rubber film portion 431b employs a configuration that continues to the first rubber portion 431 via the dividing surface of the first outer cylinder portion 421, in addition to the through hole 421a, a rubber film is further provided. There is no need to form a through hole in the first outer cylinder part 421 for connecting the part 431b to the first rubber part 431. Therefore, since formation of a through-hole can be suppressed to the minimum, the rigidity of the 1st outer cylinder part 421 can be ensured by that much, and the durable improvement can be aimed at.

  Here, the covering range of the rubber film portions 431a and 431b is partial, and there is a rubber film portion in the region above the rubber film portion 431a (upper side in FIG. 13B) and between the rubber film portions 431a and 431b. 431a and 431b are not covered (that is, the outer peripheral surface of the first outer cylinder portion 421 is exposed). Thereby, in the outer cylinder drawing step (see FIG. 14), the outer peripheral surface of the first outer cylinder part 421 can be directly pressed by a drawing die (not shown) without using the rubber film parts 431a and 431b. Drawing can be performed with high accuracy.

  The rubber base 430 includes rubber film portions 432 a and 432 b that are provided on the outer peripheral surface of the second outer cylinder portion 422. The rubber film portions 432a and 432b are configured in the same manner as the rubber film portions 431a and 431b, respectively, and thus description thereof is omitted.

  With reference to FIG.15 and FIG.16, the assembly method which assembles the vibration isolator 400 from the vulcanization molded object D and the cylindrical member 440 is demonstrated. In the first embodiment (anti-vibration device 100), the rubber base 30 (the first rubber part 31 and the second rubber part 32) is compressed in the axis O direction by the rubber base compression step (see FIG. 7). In the fourth embodiment (anti-vibration device 400), the rubber base compression step is omitted.

  FIG. 15A is a cross-sectional view of the vulcanized molded body D in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 15B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding D in the state.

  As shown in FIG. 15, in the vulcanized molded body D, in the outer cylinder drawing step, the first outer cylinder part 421 and the second outer cylinder part 422 are reduced in diameter from the outer diameter D401 to the outer diameter D402 (D402 < D401). Thereby, preliminary compression in the radial direction (perpendicular to the axis O) can be applied to the rubber base 430 (the first rubber part 431 and the second rubber part 432). The configuration and operation of the drawing die are the same as in the case of the first embodiment, and a description thereof will be omitted.

  The vulcanized molded body D is vulcanized and molded so that the interposed member 450 can be disposed in the space SP (between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422). (See FIG. 16 (a)).

  FIG. 16A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 440 in a state before the cylindrical member 440 is subjected to the drawing process in the cylindrical member drawing process, and FIG. FIG. 5 is a cross-sectional view of the vibration isolator 400 in a state after the cylindrical member 440 has been subjected to drawing processing in the cylindrical member drawing step.

  As shown in FIG. 16, in the fourth embodiment, since the rubber base compression step is omitted, the vulcanized molded body D is inserted into the cylindrical member 440 along the axis O direction, and the vulcanized molded body D is inserted. After installation on the inner peripheral side of the cylindrical member 440 (FIG. 16A), the cylindrical member 440 is drawn (FIG. 16B) in the cylindrical member drawing step.

  As shown in FIG. 16 (a), the vulcanized molded body D is inserted into the cylindrical member 440. The space SP (the split surface of the first outer cylindrical portion 421 and the second outer cylindrical portion 422) is inserted into the vulcanized molded body D. This is performed in a state in which the interposition member 450 is mounted between the divided surfaces of the two. In this case, since the two members constituting the interposed member 450 have the same shape as each other, it is not necessary to consider the directionality, and the mounting workability can be improved.

  In this way, the interposed member 450 is formed as a separate member from the first outer cylinder portion 421 and the second outer cylinder portion 422. Therefore, the vulcanized molded body D in which the first outer cylinder part 421 and the second outer cylinder part 422 and the inner cylinder member 410 are connected by the first rubber part 431 and the second rubber part 432 is added by the vulcanization mold. After the vulcanization molding, the interposed member 450 may be attached to the vulcanization molding D. That is, in the structure of the vulcanization mold (for example, the middle mold splitting structure) of the portion that forms the space SP between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432, the interposed member 450. Therefore, the structure of the vulcanization mold can be simplified.

  In the cylindrical member drawing step, two-stage drawing is performed on the cylindrical member 440. That is, the entire cylindrical member 440 is reduced from the outer diameter D403 to the outer diameter D404 by the first stage drawing (D404 <D403). Next, by the second stage drawing process, the cylindrical member 440 has the first outer cylinder portion 421 and the second outer cylinder at the one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction. The diameter of the portion 422 is reduced to a shape close to the outer peripheral surface of the concave inner peripheral surface IS of the concave inner peripheral surface IS (that is, a portion where the cross-sectional shape is curved in an arc) (inward in the radial direction in a cross-sectional view). Bend). As a result, the tubular member 440 is mounted on the vulcanized molded body D, and the assembly thereof (manufacture of the vibration isolator 400) is completed.

  In the vibration isolator 400 that has been assembled, as shown in FIG. 16B, in the second stage of drawing, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are radially inward. Along with the deformation, the upper and lower end surfaces (in the direction of the axis O) of the interposed member 450 are clamped and held from above and below by the divided surface of the first outer cylinder portion 421 and the divided surface of the second outer cylinder portion 422. .

  The first stage drawing and the second stage drawing may be performed by different drawing dies, or may be performed by the same drawing dies. When the same drawing mold is used, the first stage drawing and the second stage drawing may proceed simultaneously.

  In the cylindrical member squeezing step, the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed radially inward by the inner peripheral surface of the cylindrical member 440, and the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed. A predetermined fastening allowance (in the present embodiment, about 0.01 mm to 0.02 mm in radius) is given to the cylindrical portion 422. Thereby, the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 can be firmly hold | maintained in the cylindrical member 440. FIG. In this case, the inner peripheral surface of the tubular member 440 and the rubber film portions 431a to 432b are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 431a to 432b.

  As shown in FIG. 16A, the inner diameter of the cylindrical member 440 is the outer cylinder member 420 (first outer cylinder) after the drawing process (see FIG. 15B) by the outer cylinder drawing process. Part 421 and second outer cylinder part 422) are made larger than the outer diameter D402. In the present embodiment, the inner diameter of the tubular member 440 is made larger than the maximum outer diameter of the vulcanized molded body D (the outer diameter on the outer peripheral surface of the rubber film portions 431b and 432b). Thereby, in the assembly work of the vibration isolator 400, the work of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the tubular member 440 can be efficiently performed.

  However, the inner diameter of the cylindrical member 440 is larger than the outer diameter D402 of the outer cylindrical member 420 and smaller than the maximum outer diameter of the vulcanized molded body D (the diameter on the outer peripheral surface of the rubber film portions 431b and 432b). The rubber film portions 431b and 432b may be press-fitted while being elastically deformed. The processing amount of the drawing process applied to the cylindrical member 440 can be suppressed, and the yield can be improved and the processing cost can be reduced.

  In addition, since the rubber film portions 431a to 432b are covered on the outer peripheral surfaces of the first outer cylinder portion 421 and the second outer cylinder portion 422, as in the case of the first embodiment, a friction coefficient is ensured, The shortage of the fastening allowance due to the spring back of the tubular member 440 can be compensated by the compressive force due to the elastic recovery of the rubber film portions 431a to 432b. Therefore, even if the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422 are separated from each other, a holding force against movement in the axis O direction can be ensured. Thereby, when a large displacement is input in the direction of the axis O, the first outer cylinder portion 421 and the second outer cylinder portion 422 are prevented from moving in the cylindrical member 440 in a direction in which the divided surfaces are brought close to each other. it can.

  As described above, according to the vibration isolator 400, the rubber base compression step is omitted, and the divided surface of the first rubber part 431 and the divided surface of the second rubber part 432 are separated from each other in the axis O direction. The first outer cylinder portion 421 and the second outer cylinder in a state in which the space SP is formed between them (that is, the first rubber portion 431 and the second rubber portion 432 are not preliminarily compressed in the direction of the axis O). The portion 422 is held and fixed by the cylindrical member 440.

  Thus, by forming the space SP between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the first rubber portion 431 and the first rubber portion 431 in the twisting direction corresponding to the space SP. The compression component of the first rubber part 431 and the second rubber part 432 in the axis O direction while suppressing the shear component of the two rubber parts 432 and the compression component of the first rubber part 431 and the second rubber part 432 in the direction perpendicular to the axis O Can be secured. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  On the other hand, in such a structure in which the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the space SP is formed by a vulcanization mold (that is, In order to arrange the middle mold), it is necessary to separate the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 in the axis O direction. However, when the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 are separated in the axis O direction, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected. There is a risk of moving in the direction in which the divided surfaces are brought close to each other.

  On the other hand, according to the vibration isolator 400, since the interposed member 450 is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, the first rubber part The first outer cylinder portion 421 and the second outer cylinder portion 422 move in a direction in which the respective division surfaces are brought close to each other while ensuring the space SP between the division surface of 431 and the division surface of the second rubber portion 432. Can be regulated by the interposed member 450.

  Further, the portions on one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction of the cylindrical member 440 are the concave inner peripheral surface IS of the first outer cylinder portion 421 and the second outer cylinder portion 422. The cylindrical member 440 is reduced in diameter so as to be in close contact with the outer peripheral surface (that is, the portion where the cross-sectional shape is curved in an arc shape) (bent inward in the radial direction in the cross-sectional view). On the other hand, the movement of the first outer cylinder portion 421 and the second outer cylinder portion 422 in the direction in which the divided surfaces are separated from each other can also be restricted.

  That is, when the first outer cylinder part 421 and the second outer cylinder part 422 move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the interposed member 450 and the divided surfaces are separated from each other. In the case of moving in the direction, the movement can be restricted by a portion of the cylindrical member 440 on one end side in the axis O direction or on the other end side in the axis O direction. Thereby, since the movement in these both directions can be controlled without relying on the friction with the inner peripheral surface of the cylindrical member 440, when the large displacement is input in the axis O direction, The second outer cylinder portion 422 can be reliably suppressed from being displaced in the axis O direction with respect to the cylindrical member 440.

  In particular, the interposition member 450 is formed into a cylindrical shape by combining two members constituting the interposition member 450, so that the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422 The range interposed between the two can be almost the entire circumference in the circumferential direction. Therefore, it can be controlled stably that the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 move to the direction which makes a mutual division surface approach.

  Further, according to the vibration isolator 400, the maximum outer diameter dimension (outer diameter at the central portion in the axis O direction) of the bulging portion 412 of the inner cylinder member 410 is the first outer cylinder portion 421 and the second outer cylinder portion 422. Is larger than the minimum inner diameter dimension (inner diameter dimension of the cylindrical portion) at the end opening in the axis O direction, so that the pressure receiving area is increased with respect to the displacement in the axis O direction, and the first rubber section 431 and The compression component of the second rubber part 432 can be ensured. As a result, the effect of increasing the spring constant in the axis O direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O.

  The relationship between the maximum outer diameter of the bulging portion 412 and the minimum inner diameter of the outer cylindrical member 420 is between the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the outer cylindrical member 420. In the conventional product in which the rubber base is continuously disposed (that is, having no space SP), the rubber base shear component in the twisting direction and the direction perpendicular to the base O are simultaneously with the compressive component of the rubber base in the axial O direction. Since the compression component of the rubber base is also increased, it is impossible to employ the compression component, and the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 as in the vibration isolator 400. Can be adopted for the first time.

  Here, the present embodiment omits the rubber base compression step (see FIG. 7) compared to the first embodiment, and pre-compresses the first rubber portion 431 and the second rubber portion 432 in the axis O direction. Although it is a technical idea not to apply, in the cylindrical member squeezing step (see FIG. 15), the first rubber portion 431 and the cylindrical member 440 are deformed on one end side in the axis O direction and the other end side in the axis O direction. The second rubber portion 432 is allowed to be compressed and deformed in the axis O direction. That is, it is sufficient that a space SP is secured between the dividing surface of the first rubber part 431 and the dividing surface of the second rubber part 432.

  FIG. 17A is a top view of the interposed member 550 in the fifth embodiment, and FIG. 17B is a top view of the interposed member 650 in the sixth embodiment. With reference to FIGS. 17A and 17B, the interposed members 550 and 650 in the fifth and sixth embodiments will be described.

  Note that the height dimension of the interposition members 550 and 650 (the vertical dimension in FIG. 17A and FIG. 17B) is the height dimension of the interposition member 450 in the fourth embodiment (FIG. 13B). ) Vertical dimension)). Further, the diameters (inner diameter and outer diameter) of the interposition members 550 and 650 when not deformed are the diameters (the lower side surface in FIG. 12B) of the first outer cylinder part 421 and the second outer cylinder part 422 (the lower side surface). The inner diameter and the outer diameter).

  As shown to Fig.17 (a), the interposed member 550 is a member formed in a cylindrical shape from a metal material (in this embodiment, steel material), and only one place in the circumferential direction is divided. Therefore, the diameter of the interposition member 550 is expanded from the parting point as a starting point (the parting part is separated in the circumferential direction in the same plane), or the interposition member 550 is twisted and deformed (the parting part is axially separated). (In FIG. 17A, the direction perpendicular to the paper surface) can be separated from each other), whereby the interposing member 550 can be easily attached to the vulcanized molded body D.

  On the other hand, since the interposition member 550 is restored to its original shape by its own elastic recovery force after mounting, the interposition member 550 is held in the space SP of the vulcanized molded body D without dropping off. Can do. Therefore, the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D into the cylindrical member 440 with the interposed member 550 can be made easy.

  As shown in FIG. 17B, the interposed member 650 is formed with a bent portion 650a at a position opposite to the part to be divided (position where the phase is changed by 180 °). The bent portion 650a is formed to be curved in a C shape when viewed from above, and assists in elastic deformation (deformation that increases the diameter or torsional deformation) of the interposed member 650. Thereby, mounting | wearing of the interposed member 650 to the vulcanization molded object D can be performed easily.

  The bent portion 650 and the vicinity thereof are arranged to be offset radially inward (center side) in the top view shown in FIG. 17B, and are circular shapes formed by the outer peripheral surface of the interposed member 650. The bent portion 650a is formed so as not to protrude outward in the radial direction from the outer shape (schematically illustrated by a two-dot chain line in FIG. 17B). Thereby, in the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D with which the interposed member 650 was mounted | worn into the cylindrical member 440 (refer Fig.16 (a)), the bending | flexion part 650a inhibits an operation | work (it catches on the cylindrical member 440). ) Can be avoided and workability can be improved.

  The bent portion 650a may be formed so as to protrude outward in the radial direction from the circular outer shape formed by the outer peripheral surface of the interposed member 650. Further, in FIGS. 17A and 17B, in order to facilitate understanding, the circumferential separation amount (interval) at the portion where the interposition members 550 and 650 are divided is schematically enlarged. The circumferential distance can be arbitrarily set according to the material and the like.

  Next, a vibration isolator 700 according to the seventh embodiment will be described with reference to FIGS. In the fourth embodiment, by mounting the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other. The vibration isolator 700 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  18A is a top view of the cylindrical member 740 according to the seventh embodiment, and FIG. 18B is a cross-sectional view of the cylindrical member 740 taken along the line XVIIIb-XVIIIb of FIG. .

  The vibration isolator 700 according to the seventh embodiment is different from the vibration isolator 400 according to the fourth embodiment only in that a restriction bulging portion 740a is formed on the tubular member 740. The assembly method is the same. Therefore, only different points will be described below.

  In the tubular member 740, a restriction bulging portion 740 a is formed to bulge inward in the radial direction on the inner peripheral surface portion at the center in the axis O direction. The restriction bulging portion 740a is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422, so that the first outer cylinder portion 421 and the second outer cylinder portion 422 are arranged. It is a part for restricting movement, and is formed in a rectangular shape in front view, and a plurality (four in the present embodiment) are arranged at equal intervals in the circumferential direction.

  FIG. 19A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 740 in a state before the cylindrical member 740 is drawn in the cylindrical member drawing process, and FIG. FIG. 10 is a partial cross-sectional view of the vibration isolator 700 in a state after the cylindrical member 740 has been subjected to drawing processing in the cylindrical member drawing step. In FIG. 19B, only a part is seen in cross section.

  As shown in FIG. 19, the vibration isolator 700 in the seventh embodiment is assembled in the same manner as the vibration isolator 400 in the fourth embodiment (see FIG. 16). After inserting the body D along the axis O direction and installing the vulcanized molded body D on the inner peripheral side of the tubular member 740 (FIG. 19A), the tubular member is subjected to drawing processing by the tubular member drawing step. This is done by applying to 740 (FIG. 19B).

  Here, as shown in FIG. 19 (a), the cylindrical member 740 has an outer diameter after the inner diameter of the restriction bulging portion 740a is subjected to drawing processing (see FIG. 15 (b)) by the outer cylinder drawing process. It is made larger than the outer diameter D402 of the cylindrical member 420 (the 1st outer cylinder part 421 and the 2nd outer cylinder part 422).

  In the present embodiment, the inner diameter of the restriction bulging portion 740a is larger than the outer diameter D402 and smaller than the maximum outer diameter of the vulcanized molded body D (the outer diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). Is done. Therefore, when the vulcanized molded body D is inserted along the axis O direction into the inner peripheral side of the tubular member 440, the rubber film portions 431b and 432b are press-fitted while being elastically deformed.

  In this case, according to the vibration isolator 700, the restriction bulge portion 740a is intermittently arranged in the circumferential direction, so that it is possible to secure a space for receiving the elastically deformed rubber film portions 431b and 432b. The workability of the operation of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the cylindrical member 740 can be improved. Further, it is possible to suppress the amount of drawing processing performed on the cylindrical member 740, thereby improving the yield and reducing the processing cost.

  However, the inner diameter of the restriction bulging portion 740a of the tubular member 740 may be larger than the maximum outer diameter of the vulcanized molded body D (the diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). The operation | work which inserts the vulcanization molded object D along the axis | shaft O direction to the inner peripheral side of the cylindrical member 740 can be performed efficiently.

  In the vibration isolator 700 that has been assembled, as shown in FIG. 19B, in the second stage drawing described above, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 740 are radially inward. The upper and lower end surfaces (in the direction of the axis O) of the restriction bulging portion 740a of the cylindrical member 740 are caused by the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422. The pressure is maintained from above and below.

  As described above, according to the vibration isolator 700, the restriction bulging portion 740a of the cylindrical member 740 is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422. Therefore, the first outer cylinder part 421 and the second outer cylinder part 422 are separated from each other while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. Can be regulated by the regulation bulge portion 740a.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 740 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  In particular, according to the present embodiment, the restriction bulging portion 740a is formed by deforming (bulging radially inward) a part of the cylindrical member 740, and restricting means (first outer cylinder). It is not necessary to add another member for configuring the portion 421 and the second outer cylinder portion 422), so that the weight can be reduced accordingly. Further, it is not necessary to add another member, and the number of parts is suppressed, so that the part cost can be reduced. Further, as in the case of the fourth embodiment (vibration isolation device 400), it is not necessary to attach the restricting means (the interposed member 450) to the vulcanized molded body D, so that the assembly cost is reduced as the process becomes unnecessary. This can reduce the product cost.

  In addition, in this way, the restriction bulging part 740a is formed as a separate member from the first outer cylinder part 421 and the second outer cylinder part 422, and thus in the case of the fourth embodiment (anti-vibration device 400). In the same manner as in the above, in the structure of the vulcanization mold (for example, the middle mold split structure) of the part that forms the space SP between the divided surface of the first rubber part 431 and the divided surface of the second rubber part 432, the restriction expansion Since it is not necessary to consider the shape or the like of the protruding portion 740a, the structure of the vulcanization mold can be simplified.

  Here, in the fourth embodiment (anti-vibration device 400), the interposed member 450 serving as the restricting unit is configured as a separate member, and therefore the dividing surfaces of the first outer cylinder part 421 and the second outer cylinder part 422 are separated. If the interposition member 450 falls off from the gap, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 700, since the restriction bulging portion 740a is formed integrally with the cylindrical member 740, the restriction means (regulation bulging portion 740a) is interposed between the divided surfaces. Can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

  Next, with reference to FIG. 20, a vibration isolator 800 according to the eighth embodiment will be described. In the fourth embodiment, by mounting the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the split surfaces are brought close to each other. The vibration isolator 800 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  Note that the vibration isolator 800 according to the eighth embodiment is different from the vibration isolator 400 according to the fourth embodiment in that a chamfered surface 840a is formed on the cylindrical member 840, and the end portion in the axis O direction of the rubber base 830. And the point that the bending process for bending the end portion in the axis O direction of the outer cylinder member 420 is added, and the other configuration and the assembling method are the same. Therefore, only different points will be described below.

  FIG. 20A is a cross-sectional view of the vulcanized molded body E and the cylindrical member 840 in a state after the cylindrical member 840 is drawn in the cylindrical member drawing step, and FIG. FIG. 10 is a cross-sectional view of the vibration isolator 800 in a state after the outer cylinder member 420 is bent in the bending step.

  As shown in FIG. 20 (a), the rubber base 830 is not covered by the outer cylinder member 420 at the end in the axis O direction, and the cylindrical portion of the first outer cylinder 421 (upper side in FIG. 20 (a)). And the internal peripheral surface of the cylindrical site | part (FIG. 20 (a) lower side) of the 2nd outer cylinder part 422 is exposed. Thereby, in the bending process described later, the cylindrical parts of the first outer cylinder part 421 and the second outer cylinder part 422 can be directly pressed by a caulking die (not shown) without using a rubber film, Bending can be performed with high accuracy.

  The cylindrical member 840 is chamfered at the corner on the outer peripheral surface side at the end portion in the axis O direction to form a chamfered surface 840a having a linear cross section. That is, the chamfered surface 840a of the cylindrical member 840 is formed on the opposite side of the chamfered surface 40a (see FIG. 4B) of the cylindrical member 40 in the first embodiment. As shown in FIG. 20A, the chamfered surface 840a of the tubular member 840 forms a flat surface perpendicular to the direction of the axis O in the state after being drawn in the tubular member drawing step. Thereby, the edge part of the outer cylinder member 420 to which the bending process was given in the bending process mentioned later can be received firmly.

  In the eighth embodiment, the vulcanized molded body E is inserted along the axis O direction on the inner peripheral side of the cylindrical member 840, and as shown in FIG. After the cylindrical member 840 is applied, the cylindrical portions of the first outer cylinder portion 421 and the second outer cylinder portion 422 are then bent radially outward in a bending step. As a result, as shown in FIG. 20B, the tubular member 840 is mounted on the vulcanized molded body E, and the assembly thereof (manufacture of the vibration isolator 800) is completed.

  The caulking die for performing the bending process is caulking for bending the end portion in the axis O direction of the cylindrical member 40 described in the first embodiment except that the direction of the curved concave portion is different. Since it is the same structure as a metal mold | die, the description is abbreviate | omitted.

  As described above, according to the vibration isolator 800, the end portions (cylindrical portions) in the axis O direction of the first outer cylinder portion 421 and the second outer cylinder portion 422 are bent outward in the radial direction, The cylindrical member 840 is locked to the end portion in the axis O direction (the chamfered surface 840a). Therefore, by this locking, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. It is possible to restrict the movement in the direction in which the divided surfaces are brought close to each other.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 840 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  Particularly, according to the present embodiment, by restricting a part of the outer cylinder member 420 (the first outer cylinder part 421 and the second outer cylinder part 422) (bending outward in the radial direction), the restricting means (Means for restricting movement of the first outer cylinder part 421 and the second outer cylinder part 422) are configured. Therefore, as in the case of the seventh embodiment (anti-vibration device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. Simplification of the structure of the vulcanization mold can be achieved.

  Next, a ninth embodiment will be described with reference to FIGS. In the fourth embodiment, by attaching the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other. The vibration isolator 900 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 21A is a bottom view of the first outer tube portion 921 in the ninth embodiment, and FIG. 21B is a view of the first outer tube portion 921 taken along the line XXIb-XXIb in FIG. It is sectional drawing. In addition, since the 1st outer cylinder part 921 and the 2nd outer cylinder part 922 are the members (structure) which are the same, and only a name differs, it demonstrates the 1st outer cylinder part 921 below, The description of the second outer cylinder portion 922 is omitted.

  As shown in FIG. 21, the first outer cylinder portion 921 has a restriction projection 921b from the bottom surface (the upper surface in FIG. 21 (b), that is, the divided surface) of the portion where the cross-sectional shape is curved in an arc shape. Are partially projected along the direction of the axis O. The restricting protrusion 921b is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, thereby allowing the first outer cylinder part 421 and the second outer cylinder part 422 to move. It is a part for regulation, and is formed in a rectangular shape when viewed from the front, and a plurality (two in the present embodiment) are arranged at positions that are equally spaced in the circumferential direction (that is, the phases are different by 180 °). The

  Next, the vulcanized molded body F will be described with reference to FIG. 22A is a perspective view of the outer cylinder member 920, and FIG. 22B is a side view of the vulcanized molded body F. FIG.

  Note that the vulcanized molded body F and the vibration isolator 900 in the ninth embodiment are different from the vulcanized molded body D and the vibration isolator 400 in the fourth embodiment in the first outer cylinder portion 921 and the second outer cylinder. The only difference is that the restricting protrusions 921b and 922b are formed on the portion 922, and the other configuration and assembly method are the same. Therefore, only different points will be described below.

  As in the case of the fourth embodiment (vulcanized molded body D), the vulcanized molded body F includes an inner cylindrical member 410 and an outer cylindrical member 920 (first outer cylindrical portion 921 and second outer cylindrical portion 922). Is installed in the vulcanization mold, and the rubber base 430 (the first rubber part 431 and the second rubber part 432) is vulcanized and molded, and the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 920 (first outer cylinder). The part 921 and the inner peripheral surface of the second outer cylinder part 922) are connected by a rubber base 430 to be manufactured.

  In this case, when the first outer cylinder portion 921 and the second outer cylinder portion 922 are installed in the vulcanization mold, as shown in FIG. 22 (a), the circumferential positioning is performed and the restriction protrusions 921b, 922b are arranged. It is set as the state which the projecting front end surfaces contact | abut. As a result, the position of the split surface of the middle mold that supports the split surfaces of the first outer cylinder section 921 and the second outer cylinder section 922 is set to a position corresponding to the restricting protrusions 921b and 922b (that is, the mold release direction of the middle mold is set). 22B), the space SP formed between the divided surfaces of the first rubber part 431 and the second rubber part 432 as shown in FIG. It can exist continuously over the entire circumference in the circumferential direction. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  FIG. 23A is a top view of the vibration isolator 900, and FIG. 23B is a cross-sectional view of the vibration isolator 900 along the line XXIIIb-XXIIIb in FIG.

  As shown in FIG. 23, the vibration isolator 900 according to the ninth embodiment is assembled in the same manner as the vibration isolator 400 according to the fourth embodiment (see FIG. 16). After the body F is inserted along the axis O direction and the vulcanized molded body F is installed on the inner peripheral side of the tubular member 440, the tubular member 440 is subjected to a drawing process by a tubular member drawing step. .

  As shown in FIG. 23B, the vibration isolator 900 that has been assembled is such that the one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are in the radial direction in the second stage drawing process described above. With this deformation, the restricting projection 921b of the first outer cylinder portion 921 and the restricting projection 922b of the second outer cylinder portion 922 are brought into a state in which the projecting leading end surfaces are butted in the axis O direction. .

  As described above, according to the vibration isolator 900, the restriction protrusions 921b and 922b protrude from the dividing surfaces of the first outer cylinder portion 921 and the second outer cylinder portion 922, thereby dividing the first rubber portion 431. The first outer cylinder portion 921 and the second outer cylinder portion 922 are restricted from moving in a direction in which the respective divided surfaces are brought close to each other while securing the space SP between the surface and the divided surface of the second rubber portion 432. be able to.

  In other words, the movement of the first outer cylinder portion 921 and the second outer cylinder portion 922 in the direction in which the divided surfaces are brought close to each other is regulated without depending on the friction with the inner peripheral surface of the cylindrical member 440. Therefore, the displacement of the first outer cylinder portion 921 or the second outer cylinder portion 922 relative to the cylindrical member 440 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  In particular, according to the present embodiment, by restricting a part of the outer cylinder member 920 (the first outer cylinder part 921 and the second outer cylinder part 922), the restricting means (the first outer cylinder part 921 and the first outer cylinder part 921 and the second outer cylinder part 922). 2 means for restricting the movement of the outer cylindrical portion 922). Therefore, as in the case of the seventh embodiment (anti-vibration device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. Simplification of the structure of the vulcanization mold can be achieved.

  Here, in the fourth embodiment (anti-vibration device 400), the interposed member 450 serving as the restricting unit is configured as a separate member, and therefore the dividing surfaces of the first outer cylinder part 421 and the second outer cylinder part 422 are separated. If the interposition member 450 falls off from the gap, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 900, the restricting protrusions 921b and 922b are formed integrally with the first outer cylinder part 921 and the second outer cylinder part 922, so that the restricting means (the restricting protrusion 921b is provided between the divided surfaces. , 922b) can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

  FIG. 24A is a perspective view of the outer cylinder member 1020 in the tenth embodiment, and FIG. 24B is a perspective view of the outer cylinder member 1120 in the eleventh embodiment. With reference to Fig.24 (a) and FIG.24 (b), the outer cylinder members 1020 and 1120 in 10th and 11th Embodiment are demonstrated.

  The outer cylinder members 1020 and 1120 are different from the outer cylinder member 920 in the ninth embodiment in that the number of arrangement of the restriction projections 921b, 922b, and 1122b is different, or the protrusion height of the restriction projection 1122b is different. Except for this point, the other configurations are the same. Therefore, only different points will be described.

  As shown in FIG. 24 (a), the outer cylinder member 1020 in the tenth embodiment has four restricting projections 921b and 922b around the dividing surfaces of the first outer cylinder part 1021 and the second outer cylinder part 1022, respectively. Protruding at equal intervals in the direction. Thereby, since the area | region where the projecting front end surfaces of regulation protrusion 921b, 922b contact | abut can be disperse | distributed to the circumferential direction, the 1st outer cylinder part 1021 and the 2nd outer cylinder part 1022 can mutually separate a dividing surface. It is possible to stably regulate movement in the approaching direction.

  As shown in FIG. 24 (b), in the outer cylinder member 1120 in the eleventh embodiment, the restriction projections 1122b are formed only on the second outer cylinder part 1122 without the restriction projections formed on the first outer cylinder part 421. The In the present embodiment, two restricting projections 1122b are projected from the dividing surface along the axis O direction at positions where the phases are different by 180 °. The restricting protrusion 1122b is configured in the same manner as the restricting protrusions 921b and 922b except that the protruding height from the dividing surface is doubled.

  According to the outer cylinder member 1120 in the eleventh embodiment, no restriction projection is formed on the first outer cylinder part 421, so the directionality in the circumferential direction can be eliminated. Thereby, when installing the outer cylinder member 1120 in the vulcanization mold, it is not necessary to perform the circumferential alignment of the first outer cylinder member 421 and the second outer cylinder member 1122. Therefore, workability in installation work can be improved.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values given in the above embodiments are merely examples, and other numerical values can naturally be adopted. For example, values such as dimensions (outer diameters D1 to D4, D401 to D404, etc.) and fastening allowances of each component can be arbitrarily set.

  A part or all of the vibration isolator in each of the above embodiments is combined with a part or all of the vibration isolator in the other embodiment, or a part or all of the vibration isolator in the other embodiment. Alternatively, a vibration isolator may be configured.

  In the first to third embodiments, in the vulcanized molded bodies A to C, the first rubber portion 31 and the second rubber portion 32 are divided (the respective divided surfaces are separated in the axis O direction). Although the case has been described, the present invention is not necessarily limited thereto, and a part of the dividing surface of the first rubber part 31 and the dividing surface of the second rubber part 32 (the outer peripheral surface of the bulging part 12 of the inner cylinder member 10) (A part of the side) may be connected. On the other hand, in the fourth to eleventh embodiments, the case where the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 are partially connected is described, but the present invention is not necessarily limited to this. The first rubber part 431 and the second rubber part 432 may be divided.

  In the first to third embodiments, in the completed state (the state of the vibration isolator 100 to 300), the divided surfaces of the first outer cylinder portions 21 and 321 and the divided surfaces of the second outer cylinder portions 22 and 322 are separated. Although the case where it was spaced apart in the direction of the axis O has been described, the present invention is not necessarily limited to this, and in the completed state, the divided surfaces of the first outer cylinder portions 21 and 321 and the divided surfaces of the second outer cylinder portions 22 and 322 May be in contact with each other.

  That is, in the rubber base compression step, the rubber base 430 (the first rubber portion 31 and the first rubber portion 31) is moved to a position where the split surfaces of the first outer cylinder portions 21 and 321 and the split surfaces of the second outer cylinder portions 22 and 322 abut. 2) the rubber part 32) is compressed in the direction of the axis O, and in this state, the cylindrical member 40 is drawn in the cylindrical member drawing process, and in the bending process, the end of the cylindrical member 40 at the end in the axis O direction. You may manufacture the vibration isolator 100-300 so that it may be in the said state by giving a bending process.

  On the other hand, in the first to third embodiments, the rubber base compression step may be omitted. That is, after the outer cylinder squeezing process, the process may be shifted to the cylindrical member squeezing process without performing the rubber base compressing process (without providing the rubber base 430 with preliminary compression in the axis O direction).

  In each of the above embodiments, the case where the rubber film portions 33, 34, 233, 234, 431a, 431b are covered on the outer peripheral surface of the outer cylinder member 20, 320, 420, 620, 720 has been described. The rubber film portions 33, 34, 233, 234, 431 a and 431 b may be provided on the inner peripheral surface of the cylindrical members 40 and 440 instead of or in addition to this. .

  In the first to third embodiments, the case where the bending process is performed (bending process is performed on the end portion in the axis O direction of the tubular member 40) has been described. However, the present invention is not necessarily limited thereto, and the bending process is performed. You may abbreviate | omit and manufacture the vibration isolator 100-300. That is, the vulcanized molded products A to C are formed on the cylindrical member 40 by the holding force between the cylindrical member 40 that has been subjected to drawing processing in the cylindrical member drawing step and the rubber film portions 33, 34, 333, and 334. You may hold | maintain on the inner peripheral side.

  Although the description thereof is omitted in the first to third embodiments, through holes may be formed in the first outer cylinder portions 21 and 321 and the second outer cylinder portions 22 and 322. Since the fluidity of the rubber-like elastic body in the vulcanization molding process can be ensured by the through holes, the yield of the rubber film portions 33, 34, 333, 334 connected to the first rubber portion 31 and the second rubber portion 32 is increased. be able to.

  In each of the above embodiments, the description is omitted, but after the bending step, the inner cylinder members 10 and 410 are expanded in diameter (the inner cylinder member 10 is compressed in the axis O direction, and the end portion in the axis O direction is expanded. By doing so, you may give the process which expands the area of a seat surface.

  In the first, second, and fourth to eleventh embodiments, the outer cylinder squeezing step is performed (outer cylinder members 20, 420, 920, 1020, 1120 (first outer cylinder portions 21, 421, 921, 1021, 1121 and the second outer cylinder portion 22, 422, 922, 1022, 1122) are described. However, the present invention is not necessarily limited to this, and the outer cylinder drawing step is omitted, and the vibration isolator is provided. 100, 200, 400, 700, 800, 900 may be manufactured.

  Although the case where the outer cylinder member 320 is formed by casting has been described in the third embodiment, the present invention is not necessarily limited thereto, and the outer cylinder member 320 may be formed by forging or cutting, for example.

  In the fourth to eleventh embodiments, the case where the rubber base compression step is omitted has been described. However, the invention is not necessarily limited to this, and the rubber bases 430 and 830 are spared in the axis O direction by the rubber base compression step. The vibration isolator 400, 700, 800, 900 may be manufactured with compression applied.

  In the seventh embodiment, the case where the restriction bulging portion 740a is intermittently formed in the circumferential direction has been described. However, the present invention is not necessarily limited to this, and the restriction bulging portion 740a is continuously provided in the circumferential direction. It may be formed.

  In the eleventh embodiment, the case where the two restricting protrusions 1122b are protruded by changing the phase by 180 ° has been described. However, the present invention is not limited to this, and four restricting protrusions are equally spaced in the circumferential direction. You may project 1122b. In this case, the region where the projecting leading end surface of the restricting projection 1122b is in contact with the dividing surface of the first outer cylinder part 421 is dispersed in the circumferential direction, and the first outer cylinder part 421 and the second outer cylinder part 1122 are It is possible to stably regulate the movement in the direction in which the divided surfaces come close to each other.

  In the eleventh embodiment, the two restricting projections 1122b (that is, the projecting height is twice that of the restricting projections 921b and 922b) are projected from the dividing surface of the second outer cylindrical portion 1122. However, the present invention is not limited to this, and one of the two restricting projections 1122b protrudes from the dividing surface of the first outer cylinder portion and the other protrudes from the dividing surface of the second outer cylinder portion. May be provided. In this case, since the first outer cylinder part and the second outer cylinder part can be used as a common part, it is possible to reduce the part cost.

  Here, the “concave spherical surface” described in claim 1 does not require a complete spherical shape, but is formed as a concave surface disposed opposite to the convex spherical surface at least in the bulging portion of the inner cylinder member. If it is done, it is enough. Similarly, “concentric with a convex spherical surface” does not require that the centers coincide completely, and the center of the concave spherical surface is viewed from the first outer cylindrical portion and the second outer cylindrical portion, This means that it suffices if it is located on the same side as the center of the convex spherical surface.

100, 200, 300, 400, 700, 800, 900 Vibration isolator 10, 410 Inner cylinder member 12, 412 Swelling part 20, 320, 420, 920, 1020, 1120 Outer cylinder member 21, 321, 421, 921, 1021, 1121 1st outer cylinder part 22,322,422,922,1022,1122 2nd outer cylinder part 921b, 922b, 1122b Restriction protrusion (regulation means)
IS concave inner peripheral surface 30, 430, 830 Rubber base 31, 431 First rubber part 32, 432 Second rubber part 33, 333, 431a, 431b Rubber film part 34, 334, 432a, 432b Rubber film part 40, 440, 840 Cylindrical member 740a Restricted bulging portion (regulating means)
450, 550, 650 Interposition member (regulation means)
O-axis SP space

  The present invention relates to a vibration isolator, and in particular, while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased, and the first outer cylinder portion and the second portion divided into two are divided. The present invention relates to a vibration isolator capable of suppressing the movement of the outer cylinder portion in a direction in which the divided surfaces are brought close to each other.

  In the bush (vibration isolation device) used for the suspension device, the inner cylinder member and the outer cylinder member are connected by a rubber base made of a rubber-like elastic body. It is required to reduce the spring constant.

  In Patent Document 1, in order to reduce the spring constant in the twisting direction, a spherical bulging portion 4 bulging outward in the radial direction is provided at an axially intermediate portion of the inner cylinder 1 (inner cylinder member). An anti-vibration bush 101 (anti-vibration device) that forms an inner peripheral surface portion of the outer cylinder 2 (outer cylinder member) surrounding the bulging portion 4 into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 4. Disclosed.

  According to this anti-vibration bush 101, the rubber-like elastic body 3 (rubber base) is mainly formed between a convex spherical surface and a concentric concave spherical surface with respect to an input of displacement in the twisting direction. Since it can be deformed in the shearing direction, the spring constant in the twisting direction can be reduced.

JP 2008-019927 (paragraphs 0006, 0020, FIG. 1, etc.)

  However, the conventional anti-vibration bush 101 described above has a problem that it is not possible to sufficiently increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  On the other hand, as a result of diligent study, the applicant of the present application divided the rubber base into a first rubber part and a second rubber part at an axially central part in order to solve the above problems, and the first rubber. The present inventors have come up with a configuration in which a space is formed between the divided surface of the part and the divided surface of the second rubber part (not known at the time of filing this application).

  In this case, the outer cylinder member is also divided into a first outer cylinder part and a second outer cylinder part at the center in the axial direction, and the first outer cylinder part and the second outer cylinder part have their respective split surfaces in the axial direction. In a separated state, it is held and fixed by a cylindrical member.

  However, in this way, when the dividing surface of the first outer cylinder portion and the dividing surface of the second outer cylinder portion are separated in the axial direction, the first outer cylinder portion and the first outer cylinder portion are It has been found that the two outer cylinder parts move in a direction in which the divided surfaces are brought close to each other.

  The present invention has been made against the background of the above circumstances. While reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased and the first divided into two parts. It aims at providing the vibration isolator which can suppress that an outer cylinder part and a 2nd outer cylinder part move to the direction which makes a mutual division surface approach.

Means for Solving the Problems and Effects of the Invention

  According to the vibration isolator of claim 1, the inner cylinder member having a spherical bulge that bulges radially outward, and the concave shape that is a concave spherical surface that surrounds the bulge of the inner cylinder member. Since it has an outer cylinder member having an inner peripheral surface and a rubber base that connects between the outer peripheral surface of the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the outer cylindrical member, Thus, the rubber substrate can be deformed mainly in the shear direction. Therefore, there is an effect that the spring constant in the twisting direction can be reduced.

  In this case, according to the first aspect, the outer cylinder member is divided into two parts in the axial direction, the first outer cylinder part and the second outer cylinder part, and the concave inner peripheral surface and the second outer cylinder part in the first outer cylinder part. The first outer cylinder part and the second outer cylinder part are connected by the first rubber part and the second rubber part, respectively, between the concave inner peripheral surface of the outer cylinder part and the outer peripheral surface of the bulging part of the inner cylinder member. Is held and fixed by a cylindrical cylindrical member disposed on the outer peripheral side.

  Therefore, after the first rubber portion and the second rubber portion are vulcanized and molded, the dividing surface of the first rubber portion and the dividing surface of the second rubber portion are separated in the axial direction so that there is a space between the dividing surfaces. In the state of being formed, the first outer cylinder part and the second outer cylinder part can be held and fixed by the cylindrical member. Thus, by forming a space between the dividing surface of the first rubber part and the dividing surface of the second rubber part, the shear component of the rubber substrate in the twisting direction and the rubber substrate in the direction perpendicular to the axis can be formed. The compression component of the rubber base in the axial direction can be ensured while suppressing the compression component. As a result, it is possible to increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

Further, according to the first aspect , the first outer cylinder part or the second outer cylinder part is formed integrally with at least one of the first outer cylinder part and the split surface of the first outer cylinder part and the second outer cylinder part in the axial direction. Since the control projection is provided so as to partially project along the first and second outer cylindrical portions and the second outer portion while securing a space between the first rubber portion dividing surface and the second rubber portion dividing surface. It is possible to restrict the movement of the cylindrical portion in the direction in which the divided surfaces come close to each other by the restriction protrusion . That is, since the movement in such a direction can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member, when the large displacement is input in the axial direction, the first outer cylinder portion or the second outer cylinder It can suppress reliably that a part shifts position with respect to a cylindrical member.

  In the rubber base, the first rubber portion and the second rubber portion do not need to be completely divided (divided) in the axial direction, and it is sufficient that the rubber base is divided in the axial direction at least on the outer cylinder member side. Therefore, the 1st rubber part and the 2nd rubber part may be connected by the inner cylinder member side (it does not need to be divided in the direction of an axis). That is, the first rubber part and the second rubber part may be connected by a part of the rubber base that covers the outer peripheral surface of the inner cylinder member.

Moreover , since the maximum outer diameter dimension in the bulging part of the inner cylinder member is made larger than the minimum inner diameter dimension in the axial end opening of the first outer cylinder part and the second outer cylinder part, With respect to the displacement, the pressure receiving area can be increased to ensure the compression component of the rubber base. As a result, the effect of increasing the spring constant in the axial direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

Note that, in the conventional product in which the rubber base is continuously disposed between the bulging portion of the inner cylinder member and the concave inner peripheral surface of the outer cylinder member, the configuration of the first aspect is the rubber in the axial direction. Simultaneously with the compressive component of the base, the shear component of the rubber base in the twisting direction and the compressive component of the rubber base in the direction perpendicular to the axis also increase, and thus cannot be employed. This is possible for the first time by forming a space between the dividing surface and the dividing surface of the second rubber part, thereby ensuring the compression component of the rubber base in the axial direction and the rubber in the twisting direction. The shear component of the substrate and the compression component of the rubber substrate in the direction perpendicular to the axis can be suppressed. That is, the spring constant in the axial direction can be increased while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

Further, since obtain Bei the regulating projection is partially protruded in the axial direction from the dividing surface with integrally formed with the at least one of the first outer cylinder portion or the second outer tube section, a reduction of product cost It is possible to improve the reliability of the effect of suppressing the displacement of the first outer cylinder part and the second outer cylinder part with respect to the cylindrical member.

That is, since the regulation projections are integrally formed on at least one of the first outer cylinder portion or the second outer tubular portion, if the regulating projection is formed on the first outer cylindrical portion and the second outer cylindrical portion and another member The number of parts can be reduced as compared with. As a result, it is possible to reduce the part cost and the assembly man-hour (installation man-hour for the vulcanization mold), and the product cost can be reduced accordingly.

Further, when the restriction projection is formed separately from the first outer cylinder portion and the second outer cylinder portion, the restriction projection is formed between the division surface of the first outer cylinder portion and the division surface of the second outer cylinder portion. If it falls off and the restricting protrusion is not interposed between the divided surfaces, the effect of suppressing the displacement may not be exhibited. In contrast, as in claim 1, if regulation protrusion is formed integrally with at least one of the first outer cylinder portion or the second outer tube section, divided surface of the first outer tube section and the second outer since the interposed state without dropping the regulations Sei突force between the split surface of the cylindrical portion can be maintained, to reliably exhibit a positional deviation suppressing effect can be achieved that improvement in reliability.

Further, since the restricting projection is partially projected from at least one split surface of the first outer cylinder part or the second outer cylinder part, the first outer cylinder part and the second outer cylinder part are vulcanized by a vulcanization mold. (2) When connecting the outer cylinder part and the inner cylinder member by the first rubber part and the second rubber part, the dividing surface of the first rubber part and A vulcanization mold can be disposed between the divided surfaces of the second rubber part. Accordingly, a space is formed between the divided surface of the first rubber portion and the divided surface of the second rubber portion while the effect of suppressing the displacement of the first outer cylinder portion and the second outer cylinder portion can be exhibited by the restricting projection portion. There is an effect that can be done.
Further, the cylindrical member is subjected to drawing processing, and one end side in the axial direction and the other end side in the axial direction of the cylindrical member become the back side of the concave inner peripheral surface of the first outer cylinder portion and the second outer cylinder portion. Since it is formed in a shape reduced in diameter along the outer peripheral surface, the first outer cylinder part and the second outer cylinder part are only moved in the direction in which the divided surfaces come close to the cylindrical member. In addition, there is an effect that it is possible to restrict the movement in the direction of separating the divided surfaces.
That is, when the first outer cylinder part and the second outer cylinder part move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the restriction protrusions, and the movement is made in the direction in which the divided surfaces are separated from each other. In that case, the movement can be restricted by one axial end side or the other axial end side of the cylindrical member. As a result, the movement in both directions can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member. Therefore, when a large displacement is input in the axial direction, the first outer cylinder portion or the second outer It is possible to reliably suppress the displacement of the tubular portion with respect to the tubular member.

According to the vibration isolator of claim 2 , in addition to the effect of the vibration isolator according to claim 1 , the first rubber part while suppressing the occurrence of peeling and cracking of the first rubber part and the second rubber part. Further, there is an effect that pre-compression can be imparted to the second rubber portion in the radial direction (perpendicular to the axis).

  Here, the vibration isolator imparts preliminary compression in the radial direction to the rubber base in order to ensure the durability thereof. The provision of the precompression in the radial direction to the rubber base is usually performed by drawing the outer cylinder member. In this case, in the structure in which a concave spherical surface is formed on the inner peripheral surface portion of the outer cylinder member (outer cylinder) as in the conventional product, the concave spherical surface and the concave spherical surface are not formed. A difference in thickness occurs between the portions and the thickness of the portion where the concave spherical surface is not formed becomes thick, so that drawing of the outer cylinder member becomes difficult.

  Therefore, in the conventional product, a plurality of concave grooves extending in the axial direction and having a depth equivalent to that of the concave spherical surface are formed on the inner peripheral surface of the outer cylinder member in the circumferential direction. As a result, the outer cylinder member undergoes drawing deformation so that the groove width of each concave groove becomes narrow with drawing, so there is a difference in thickness and the thickness of the portion where the concave spherical surface is not formed. Drawing can be performed even if the thickness is large.

  However, with this conventional product, the spring constant in the twisting direction can be reduced, but by forming a concave groove in the outer cylindrical member to enable drawing, the rubber base (rubber-like elastic body) can be pre-compressed. Since it is a structure to be applied, when the outer cylinder member is drawn, deformation concentrates on the concave groove, and the rubber-like elastic body is peeled off at the portion bonded to the concave groove, and the groove width is narrowed. Cracks are generated in the rubber substrate between the concave grooves.

In contrast, according to claim 2, in a state in which drawing process with the first outer tube section and the second outer tube section is applied, the first outer tube section and the second outer tube section is held and fixed by the tubular member Therefore, there is an effect that preliminary compression in the radial direction can be applied to the first rubber portion and the second rubber portion. In addition, since the first outer cylinder part and the second outer cylinder part are formed from a material having a constant plate thickness into a shape having a concave inner peripheral surface, the first outer cylinder part and the second outer cylinder part can be drawn. It is not necessary to form a concave groove for Therefore, there is an effect that radial compression can be applied to the first rubber portion and the second rubber portion while suppressing occurrence of peeling and cracking of the first rubber portion and the second rubber portion.

  That is, in the present invention, since the cylindrical member holds and fixes the first outer cylinder part and the second outer cylinder part, the shape as an attachment site to the mating member (for example, press-fitting into the press-fitting hole of the suspension arm is possible. The outer shape) can be carried by the cylindrical member, and the first outer cylinder portion and the second outer cylinder portion do not need to take into account the shape as an attachment site to the mating member. Therefore, the first outer cylinder part and the second outer cylinder part can be formed from a material having a constant plate thickness, for example, by pressing, and as a result, the first outer cylinder part and the second outer cylinder part can be formed without providing a concave groove. The second outer cylinder portion can be drawn.

According to the vibration isolator of claim 3 , in addition to the effect of the vibration isolator according to claim 1 or 2 , the cylindrical member is subjected to drawing processing, that is, the first outer cylinder portion and the second outer cylinder portion. Since the first outer cylinder portion and the second outer cylinder portion are held and fixed by the cylindrical member by tightening the outer peripheral surface side of the outer cylinder portion by the inner peripheral surface side of the cylindrical member, the holding and fixing are easily performed. There is an effect that can be. Further, since the inner diameter of the cylindrical member before the drawing process can be made larger than the outer diameters of the first outer cylinder part and the second outer cylinder part, the first outer cylinder part and the second outer cylinder in the assembly process. There is an effect that the operation of inserting the portion into the inner peripheral side of the tubular member along the axial direction can be efficiently performed.

  In this case, when the outer peripheral surface of the first outer cylinder part and the second outer cylinder part and the inner peripheral surface of the cylindrical member are in direct contact (that is, the metal materials are in contact with each other), the friction between the two It is difficult to secure the coefficient. Moreover, since the member located in the outer peripheral side becomes large, the spring back after a drawing process becomes difficult to ensure a fastening allowance. Therefore, there is a possibility that the first outer cylinder part and the second outer cylinder part may come out in the axial direction from the cylindrical member.

  On the other hand, in the present invention, a rubber film portion composed of a rubber-like elastic body is provided on at least a part of at least one of the outer peripheral surface of the first outer cylinder portion and the second outer cylinder portion or the inner peripheral surface of the cylindrical member. Since it is covered, the friction coefficient can be secured by the intervention of the rubber film portion. Further, the rubber film portion is interposed, so that the shortage of the tightening allowance due to the spring back of the cylindrical member can be compensated by the compressive force due to the elastic recovery of the rubber film portion. Therefore, there is an effect that it is possible to secure a holding force against the axial withdrawal and to prevent the first outer cylinder portion and the second outer cylinder portion from coming out of the cylindrical member in the axial direction.

According to the third aspect , since the cylindrical member is drawn, the first outer cylindrical portion and the second outer cylindrical portion are radially arranged (perpendicular to the axis) on the inner peripheral side of the cylindrical member. There is an effect that it is possible to suppress rattling.

(A) is a top view of the vibration isolator in 1st Embodiment of this invention, (b) is sectional drawing of the vibration isolator in the Ib-Ib line | wire of Fig.1 (a). (A) is a top view of an inner cylinder member, (b) is sectional drawing of the inner cylinder member in the IIb-IIb line | wire of Fig.2 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the IIIb-IIIb line | wire of Fig.3 (a). (A) is a top view of a cylindrical member, (b) is sectional drawing of the cylindrical member in the IVb-IVb line | wire of Fig.4 (a). (A) is a top view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the Vb-Vb line | wire of Fig.5 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of a vulcanization molded object and a cylindrical member in the state where a rubber base was compressed in the direction of an axis in a rubber base compression process, (b) is a cylindrical member in a cylindrical member squeezing process. It is sectional drawing of a vulcanization molded object and a cylindrical member in the state after drawing processing. (A) is sectional drawing of the vulcanization molded object and a cylindrical member in the state before a bending process is given in a bending process, (b) is in the state after a bending process was given in the bending process. It is sectional drawing of a vulcanization molded object and a cylindrical member. (A) is sectional drawing of the vulcanization molded object B which comprises the vibration isolator in 2nd Embodiment, (b) is sectional drawing of the vibration isolator in 2nd Embodiment. (A) is sectional drawing of the vulcanization molded object which comprises the vibration isolator in 3rd Embodiment, FIG.10 (b) is sectional drawing of the vibration isolator in 3rd Embodiment. (A) is a top view of the vibration isolator in 4th Embodiment, (b) is sectional drawing of the vibration isolator in the XIb-XIb line | wire of Fig.11 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the XIIb-XIIb line | wire of Fig.12 (a). It is a top view of an interposed member, (b) is sectional drawing of the interposed member in the XIIIb-XIIIb line | wire of Fig.13 (a). (A) is a side view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the XIVb-XIVb line | wire of Fig.14 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is sectional drawing of the vibration isolator in the state after the drawing process was given to the cylindrical member. (A) is a top view of the interposed member in 5th Embodiment, (b) is a top view of the interposed member in 6th Embodiment. (A) is a top view of the cylindrical member in 7th Embodiment, (b) is sectional drawing of the cylindrical member in the XVIIIb-XVIIIb line | wire of Fig.18 (a). (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is a fragmentary sectional view of the vibration isolator in the state after the drawing process was given to the cylindrical member. It is a figure which shows the vibration isolator in 8th Embodiment, (a) is a cross section of a vulcanization molded object and a cylindrical member in the state after a cylindrical member was drawn in the cylindrical member drawing process It is a figure and (b) is sectional drawing of the vibration isolator in the state after the bending process was given to the outer cylinder member in the bending process. (A) is a bottom view of the 1st outer cylinder part in 9th Embodiment, (b) is sectional drawing of the 1st outer cylinder part in the XXIb-XXIb line | wire of Fig.21 (a). (A) is a perspective view of an outer cylinder member, (b) is a side view of a vulcanization molded object. (A) is a top view of a vibration isolator, (b) is sectional drawing of the vibration isolator in the XXIIIb-XXIIIb line | wire of Fig.23 (a). (A) is a perspective view of the outer cylinder member in 10th Embodiment, (b) is a perspective view of the outer cylinder member in 11th Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the vibration isolator 100 will be described with reference to FIG. FIG. 1A is a top view of the vibration isolator 100 according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the vibration isolator 100 taken along the line Ib-Ib in FIG. FIG.

  As shown in FIG. 1, a vibration isolator 100 is a vibration isolating bush used for an automobile suspension device (suspension device), and is arranged on a cylindrical inner cylinder member 10 and an outer peripheral side of the inner cylinder member 10. The outer cylinder member 20 is provided, the inner cylinder member 10 and the outer cylinder member 20 are connected to each other, and the rubber base 30 formed of a rubber-like elastic body is disposed on the outer peripheral side of the outer cylinder member 20. And a tubular member 40 having a tubular shape.

  The vibration isolator 100 is configured such that the end surface in the axial O direction of the inner cylinder member 10 is clamped and fixed between a pair of clamping portions in the bracket of the suspension member via an attachment bolt inserted into the inner cylinder member 10. The shaped member 40 is press-fitted into a press-fitting hole at one end of the suspension arm (in this embodiment, the lower arm), and is thereby mounted on the suspension device of the automobile.

  Next, with reference to FIGS. 2 to 4, the detailed configuration of each part constituting the vibration isolator 100 will be described. First, with reference to FIG. 2, the detailed structure of the inner cylinder member 1 is demonstrated. 2A is a top view of the inner cylinder member 10, and FIG. 2B is a cross-sectional view of the inner cylinder member 10 taken along the line IIb-IIb in FIG. 2A.

  As shown in FIG. 2, the inner cylinder member 10 includes a cylindrical shaft part 11 in which an insertion hole through which a mounting bolt is inserted is formed along the axis O, and a radially outer side from the outer peripheral surface of the shaft part 11. And a spherical bulging portion 12 that bulges toward the direction, and these are integrally formed of a metal material. Note that the shaft portion 11 and the bulging portion 12 may be configured separately from different materials (for example, the bulging portion 12 is a resin material).

  The bulging portion 12 is disposed at the center of the shaft portion 11 in the axis O direction (the center in the vertical direction in FIG. 2B), and the center of the convex spherical surface of the bulging portion 12 is on the axis O of the shaft portion 11. To position. That is, the inner cylinder member 10 is formed in a rotationally symmetric shape with the axis O as the axis of symmetry (rotation center).

  With reference to FIG. 3, the detailed structure of the outer cylinder member 20 is demonstrated. Fig.3 (a) is a top view of the 1st outer cylinder part 21, FIG.3 (b) is sectional drawing of the 1st outer cylinder part 21 in the IIIb-IIIb line | wire of Fig.3 (a). FIG. 3 shows a state before the drawing process (see FIG. 6) in the outer cylinder drawing process.

  In addition, the outer cylinder member 20 is divided into two at the center part in the axis O direction into a first outer cylinder part 21 and a second outer cylinder part 22 (see FIG. 1). Since the first outer cylinder portion 21 and the second outer cylinder portion 22 are the same member (configuration) and are different only in names, the first outer cylinder portion 21 will be described below. Description of the 2 outer cylinder part 22 is abbreviate | omitted.

  As shown in FIG. 3, the first outer cylinder portion 21 is a member obtained by forming a plate-like metal material (steel material in the present embodiment) with a constant plate thickness into a vessel shape by pressing, It is formed in rotational symmetry with the axis O as the axis of symmetry (rotation center).

  In addition, since the 1st outer cylinder part 21 is formed from a raw material with a fixed plate | board thickness, it is not necessary to form the ditch | groove for enabling drawing like the conventional product. Therefore, in the outer cylinder drawing process (see FIG. 6) in which the first outer cylinder portion 21 and the second outer cylinder portion 22 are drawn, the occurrence of peeling and cracking of the first rubber portion 31 and the second rubber portion 32 is suppressed. However, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the first rubber portion 31 and the second rubber portion 32.

  That is, since the first outer cylinder portion 21 (and the second outer cylinder portion 22) is held and fixed to the cylindrical member 40 (see FIG. 1), the shape (this embodiment) as an attachment site to the counterpart member Then, the cylindrical member 40 can be made to bear the outer shape that can be press-fitted into the press-fitting hole of the lower arm, and the first outer cylinder portion 21 does not need to consider the shape as an attachment site to the counterpart member. Therefore, the 1st outer cylinder part 21 can be shape | molded by a press work from the raw material with fixed board thickness, As a result, even if it does not provide a ditch | groove, the 1st outer cylinder part 21 (and 2nd outer cylinder) Part 22) can be drawn.

  The first outer cylinder portion 21 includes an annular portion 20a formed in an annular plate shape orthogonal to the axis O, a curved portion 20b that is connected to the inner edge of the annular portion 20a and whose cross-sectional shape is curved in an arc shape, A conical cylindrical enlarged portion 20c that is connected to the end of the curved portion 20b (lower side in FIG. 3 (b)) and is spaced apart from the curved portion 20b so that the inner diameter is gradually enlarged, and the largest diameter side of the enlarged portion 20c And a cylindrical portion 20d having a substantially constant inner diameter, and these portions 20a to 20d are integrally formed coaxially along the axis O.

  The enlarged diameter portion 20c and the cylindrical portion 20d are smoothly connected in a circular arc shape in cross section. Further, when the annular portion 20a is formed in an annular plate shape orthogonal to the axis O, and the end portion in the axis O direction of the cylindrical member 40 is bent radially inward in a bending step (see FIG. 8) described later. The bent portion overlaps the annular portion 20a in the direction of the axis O (see FIG. 1). Therefore, the engagement between the bent portion of the tubular member 40 and the annular portion 20a can be strengthened.

  Here, the inner peripheral surfaces of the enlarged diameter portion 20c and the cylindrical portion 20d are defined as the concave inner peripheral surface IS. The concave inner peripheral surface IS is a portion surrounding the bulging portion 12 of the inner cylinder member 10, and the enlarged diameter portion 20c and the cylindrical portion 20d are drawn (drawn and deformed) in the outer cylinder drawing step (see FIG. 6). Thus, the shape of the concave inner peripheral surface IS is formed into a concave spherical surface concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10 (see FIG. 1).

  In the present embodiment, as shown in FIG. 3, the outer diameter of the annular portion 20a (the diameter at the outer edge of the annular portion 20a) D1 is the outer diameter of the cylindrical portion 20d (the diameter of the outer peripheral surface of the cylindrical portion 20d) D2. (D1 <D2). Thereby, in the outer cylinder drawing step (see FIG. 6), only the portion of the cylindrical portion 20d can be brought into contact with a die piece (not shown) and can be pressed (moved) radially inward by the die piece. Therefore, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  The cylindrical member 40 will be described with reference to FIG. 4A is a top view of the tubular member 40, and FIG. 4B is a cross-sectional view of the tubular member 40 taken along line IVb-IVb of FIG. 4A. 4 shows a state before the cylindrical member drawing step (see FIG. 7) (that is, the cylindrical member 40 before drawing).

  As shown in FIG. 4, the cylindrical member 40 is a member formed in a cylindrical shape having an axis O from a metal material (a steel material in the present embodiment). That is, the cylindrical member 40 is formed in a shape that is rotationally symmetric with the axis O as the axis of symmetry (rotation axis).

  The inner diameter of the cylindrical member 40 is the maximum outer diameter of the vulcanized molded body A after the drawing process (see FIG. 6B) in the outer cylinder drawing process described later (the outer peripheral surfaces of the rubber film portions 33 and 34). Larger than the diameter). In the present embodiment, it is made larger than the maximum outer diameter (outer diameter D2 of the cylindrical portion 20d) of the vulcanized molded body A before drawing. Thereby, in the assembly work of the vibration isolator 100, the work of inserting the vulcanized molded body A into the inner peripheral side of the tubular member 40 along the axis O direction can be efficiently performed (FIG. 7A). reference).

  Further, at the end of the cylindrical member 40 in the axis O direction (the vertical direction in FIG. 4 (b)), a chamfering process is performed on a corner portion on the inner peripheral surface side to form a chamfered surface 40a having a linear cross section. The formation of the chamfered surface 40a can also improve the workability of inserting the vulcanized molded body A along the axis O direction into the inner peripheral side of the cylindrical member 40. Furthermore, by providing the chamfered surface 40a, it is possible to easily bend the end portion in the axial O direction of the tubular member 40 radially inward in a bending step (see FIG. 8) described later.

  Next, a method for manufacturing the vibration isolator 100 will be described with reference to FIGS. First, with reference to FIG. 5, the manufacturing method of the vulcanization molded object A is demonstrated, and the structure of the rubber base | substrate 30 is demonstrated collectively. 5A is a top view of the vulcanized molded body A, and FIG. 5B is a cross-sectional view of the vulcanized molded body A taken along the line Vb-Vb in FIG. 5A.

  As shown in FIG. 5, the vulcanized molded body A is a part molded by a vulcanization mold and constitutes one element of the vibration isolator 100. That is, the vibration isolator 100 is configured by mounting the tubular member 40 on the vulcanized molded body A. The vulcanized molded body A is manufactured by placing the inner cylinder member 10 and the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) in a vulcanization mold, and after clamping the mold, a rubber material And the rubber substrate 30 is vulcanized and molded. Thereby, the outer peripheral surface of the inner cylindrical member 10 and the inner peripheral surface of the outer cylindrical member 20 (the first outer cylindrical portion 21 and the second outer cylindrical portion 22) are connected by the rubber base 30, and the vulcanized molded body A Is manufactured.

  In addition, the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 are coaxially installed in a vulcanization metal mold | die with the attitude | position which mutually faced the cylindrical parts 20d. The vulcanization mold includes an intermediate mold located in the center of the inner cylinder member 10 in the direction of the axis O (the vertical direction in FIG. 5 (b)). The intermediate mold has an annular shape after clamping, The inner peripheral front end edge of the middle mold is in close contact with the outer peripheral surface of the bulging portion 12 and the top of the spherical surface.

  Thereby, the middle type is interposed between the split surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22, so that the first outer cylinder portion 21 and the second outer cylinder portion 22 have their split surfaces ( The end portion of the cylindrical portion 20d in the axis O direction and the lower side surface of FIG. 3 (b) are placed in the vulcanization mold in a state of being separated in the direction of the axis O, and the rubber base 30 includes the first rubber portion 31 and the second rubber. It is vulcanized and molded into a portion 32 divided into two in the direction of the axis O. That is, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) of the vulcanized molded body A has a split surface of the first outer cylinder portion 21 and a split surface of the second outer cylinder portion 21 in the axis O direction. And a state in which a predetermined interval is provided.

  The first rubber portion 31 is a portion that connects the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the concave inner peripheral surface IS of the first outer cylinder portion 21, and the second rubber portion 32 is the inner cylinder member 10. This is a portion for connecting the outer peripheral surface of the bulging portion 12 and the concave inner peripheral surface IS in the second outer cylindrical portion 22. The first rubber part 31 and the second rubber part 32 are disposed with a predetermined interval between the divided surfaces. The interval between the divided surfaces is formed so as to become narrower from the first outer cylinder portion 21 and the second outer cylinder portion 22 toward the bulging portion 12 of the inner cylinder member 10.

  The first rubber part 31 and the second rubber part 32 do not have to be completely divided (divided) in the axis O direction. For example, even if the first rubber part 31 and the second rubber part 32 are connected by a part (for example, a film-like body) of the rubber base 30 that covers the outer peripheral surface of the bulging part 12 of the inner cylinder member 10. good.

  The rubber base 30 includes rubber film portions 33 and 34 that are covered on the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The rubber film portions 33 and 34 are portions that form a circular outer peripheral surface with the axis O as the center, and are formed in a range from the annular portion 20a to the middle of the conical portion 20c, and the annular portion 20a. Are connected to the first rubber part 31 or the second rubber part 32 via the upper or lower surface (for example, the upper side surface of FIG. 5B in the case of the rubber film 33) and the inner peripheral surface of the curved part 20b.

  In the present embodiment, as shown in FIG. 5, the outer diameter of the rubber film portions 33, 34 (the diameter on the outer peripheral surface of the rubber film portions 33, 34) D3 is the outer diameter of the cylindrical portion 20d (cylindrical portion 20d). Is smaller than D2 (D3 <D2).

  Here, the covering range of the rubber film portions 33 and 34 is a range up to the middle of the conical portion 20c, and the rubber film portion 33 and the remaining portion of the conical portion 20c on the cylindrical portion 20d side are disposed on the cylindrical portion 20d. 34 is not covered (that is, the outer peripheral surface is exposed). Thus, in the outer cylinder drawing step (see FIG. 6), the cylindrical portion 20d and the conical portion 20c can be directly pressed by the drawing die (not shown) without using the rubber film portions 33 and 34. The drawing process can be performed with high accuracy.

  The rubber film portions 33 and 34 are provided with receiving recesses 33a and 34a that are recessed from the outer peripheral surface thereof toward the conical portion 20c and are located on the cylindrical portion 20d side. As a result, the contact area between the vulcanization mold and the conical portion 20c can be secured and the sealing performance at the time of vulcanization molding can be improved, so that the rubber film portions 33 and 34 are formed on the outer peripheral surface of the cylindrical portion 20d. Can be suppressed. In addition, by providing the receiving recesses 33a and 34a, a space is formed between the inner peripheral surface of the cylindrical member 40 and the outer peripheral surface of the conical portion 20c in the cylindrical member drawing step (see FIG. 7). In the space, the rubber film portions 33 and 34 that have become surplus can be received.

  An assembly method for assembling the vibration isolator 100 from the vulcanized molded body A and the tubular member 40 will be described with reference to FIGS. The vibration isolator 100 is assembled by an outer cylinder drawing step (see FIG. 6) for drawing the outer cylinder member 20 (first outer cylinder portion 21 and second outer cylinder portion 22), and a rubber base 30 (first rubber portion). 31 and the second rubber portion 32) in the direction of the axis O, a rubber base compression step (see FIG. 7), a cylindrical member drawing step for drawing the cylindrical member 40 (see FIG. 7), and a cylindrical member This is performed by sequentially performing a bending step (see FIG. 8) for bending the end portions of the 40 axis O directions.

  The outer cylinder drawing process will be described with reference to FIG. FIG. 6A is a cross-sectional view of the vulcanized molded body A in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 6B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding A in the state.

  The drawing die for drawing the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) is an annular die and an annular shape that holds and guides the annular die from the outer peripheral side. (All are not shown). The die is divided into a plurality of die pieces in the circumferential direction, and a tapered surface is formed on the outer peripheral surface. The holder has a tapered surface corresponding to the tapered surface of the die formed on the inner periphery.

  In the outer cylinder drawing step, the die is held by a holder installed on the table of the press device, the vulcanized molded body A is set on the inner peripheral side of the die, and then the die is pressed against the holder by the pressing force of the press device. To move relative. By such relative movement, each die piece is guided radially by the taper surface of the inner peripheral surface of the holder to the axial center O of the vulcanized molded body A toward the axis O. Are moved closer to each other and the diameter of the die is reduced.

  Thereby, as shown in FIG.6 (b), the outer peripheral surface of the cylindrical part 20d of the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 presses radially inward by the inner peripheral surface of each die piece. Then, the first outer cylinder part 21 and the second outer cylinder part 22 are drawn.

  By this outer cylinder drawing process, the cylindrical part 20d of the first outer cylinder part 21 and the second outer cylinder part 22 is reduced in diameter from the outer diameter D2 to the outer diameter D4 (D4 <D2). Thereby, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the rubber base 30 (the first rubber portion 31 and the second rubber portion 32).

  Further, as the diameter of the cylindrical portion 20d is reduced, the conical portion 20c and the cylindrical portion 20d are drawn and deformed so as to be bent radially inward with the curved portion 20b as a fulcrum. Is curved. As a result, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 12 of the inner cylinder member 10.

  In the present embodiment, the outer diameter D2 is 53.6 mm, and the outer diameter D4 is 52.0 mm. Further, the outer diameter D4 is made smaller than the outer diameter D3 (see FIG. 5) of the rubber film portions 33 and 34 (D4 <D3). That is, in the vulcanized molded body A shown in FIG. 6B after the outer cylinder drawing process is performed, the rubber film portions 33 and 34 have a larger diameter than the cylindrical portion 20d, and the rubber film portions 33 and 34 are formed. The outer peripheral surface is disposed radially outward (a position spaced apart from the axis O) from the outer peripheral surface of the cylindrical portion 20d.

  With reference to FIG. 7, a rubber base | substrate compression process and a cylindrical member squeezing process are demonstrated. FIG. 7A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state where the rubber base 30 is compressed in the axis O direction in the rubber base compression step, and FIG. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after the drawing process was given to the cylindrical member 40 in the member drawing process.

  As shown in FIG. 7A, in the rubber base compression process, first, the vulcanized molded body A is inserted into the cylindrical member 40 along the direction of the axis O, and the vulcanized molded body A is inserted into the cylindrical member 40. Install on the circumference side. Subsequently, the first outer cylinder portion 21 and the second outer cylinder portion 22 of the vulcanized molded body A are divided into the split surfaces of both the outer cylinder portions 21 and 22 (the end surface in the axis O direction of the cylindrical portion 20d, FIG. 3B lower). Side surface) Relatively move in the direction of axis O so that they are close to each other.

  Specifically, the annular part 20a of the first outer cylinder part 21 and the annular part 20a of the second outer cylinder part 22 are sandwiched between the end surfaces of the pair of cylindrical jigs J, and the upper jig J is placed on the lower side. Push down toward the jig J by a predetermined amount in the direction of the axis O. In the present embodiment, as shown in FIG. 7A, a predetermined gap is formed between the divided surface of the first outer cylinder part 21 and the divided surface of the second outer cylinder part 22. The pair of jigs J is fixed.

  As shown in FIG. 7B, the drawing of the tubular member 40 by the tubular member drawing step is performed with the pair of jigs J fixed (that is, the rubber base 30 (the first rubber portion 31 and the second rubber member 30). The rubber part 32) is carried out while maintaining the state compressed in the direction of the axis O). The configuration of the drawing die for drawing the cylindrical member 40 and the operation thereof are the same as those of the drawing die used in the outer cylinder drawing step, and the description thereof will be omitted.

  Here, the drawing of the cylindrical member 40 is performed by pressing the cylindrical portion 20d of the first outer cylindrical portion 21 and the second outer cylindrical portion 22 inward in the radial direction by the inner peripheral surface of the cylindrical member 40. By giving a predetermined fastening allowance (in the present embodiment, about 0.01 mm to 0.02 mm in radius) to the part 20d, the first outer cylinder part 21 and the second outer cylinder part 22 are placed in the cylindrical member 40. The purpose is to hold on. In this way, the tightening margin is set to a small value, and drawing can be performed by the operation of the drawing die with a relatively low pressure, so that the press device can be downsized. In this case, as will be described later, the inner peripheral surface of the tubular member 40 and the rubber film portions 33 and 34 are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 33 and 34.

  The bending process will be described with reference to FIG. FIG. 8A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state before the bending process is performed in the bending process, and FIG. 8B is a diagram illustrating the bending process performed in the bending process. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after being done.

  The caulking die for bending the end of the cylindrical member 40 in the axis O direction includes a pair of annular dies and a holder that holds the pair of dies so as to be movable in the axis O direction. On the opposing surfaces of the pair of dies, a curved concave portion, which is a concave portion in which a cross-sectional shape cut along a plane including the axis O curves in a circular arc shape, is recessed at a portion where the end portion in the axial O direction of the cylindrical member 40 abuts. Established.

  In the bending process, after the vulcanized molded body A and the cylindrical member 40 in the state shown in FIG. 8A are set between a pair of dies of a caulking die installed on a table of the press apparatus, The pair of dies are moved relative to each other in the direction approaching each other by the applied pressure. With this relative movement, the end portion in the axis O direction of the tubular member 40 is deformed along the inner surface shape of the curved concave portion of the die and bent toward the radially inward side. As a result, as shown in FIG. 8B, the tubular member 40 is attached to the vulcanized molded body A, and the assembly thereof (manufacture of the vibration isolator 100) is completed.

  Here, the cylindrical member 40 has been subjected to the drawing process in the cylindrical member drawing step described above (see FIG. 7), so that the pair of jigs J are removed as shown in FIG. Even in this state, the first outer cylinder part 21 and the second outer cylinder part 22 can be held on the inner peripheral side.

  In this case, when the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22 and the inner peripheral surface of the cylindrical member 40 are in direct contact (that is, the metal materials are in contact with each other), It is difficult to ensure the coefficient of friction. Further, since the spring back after the drawing process is enlarged by the cylindrical member 40 located on the outer peripheral side, it is difficult to secure the tightening allowance. Therefore, the first outer cylinder portion 21 and the second outer cylinder portion 22 may come out from the cylindrical member 40 in the axis O direction.

  On the other hand, in the present embodiment, rubber film portions 33 and 34 made of a rubber-like elastic body are covered on part of the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The friction coefficient can be secured by the intervention of the rubber film portion. Further, the rubber film portions 33 and 34 are interposed, so that the shortage of the tightening allowance due to the spring back of the tubular member 40 can be compensated by the compression force due to the elastic recovery of the rubber film portions 33 and 34. Therefore, it is possible to secure a holding force against the withdrawal in the axis O direction, and to prevent the first outer cylinder portion 21 and the second outer cylinder portion 22 from coming out of the cylindrical member 40 in the axis O direction. Thereby, the caulking die used in the bending process does not need to consider the relationship with the jig J (that is, the bending process can be performed with the jig J removed). It can be simplified.

  In addition, even if the first outer cylinder portion 21 and the second outer cylinder portion 22 are slightly shifted in the direction of the axis O (moved in the direction of withdrawal) by removing the pair of jigs J, When bending the axial O-direction end of the cylindrical member 40 in the bending step, the bent portions are used to push back the first outer cylindrical portion 21 and the second outer cylindrical portion 22 to define the position in the axial O direction. (Can be placed at an appropriate position).

  In addition, the cylindrical member 40 is subjected to drawing processing, and the inner peripheral surface thereof is in close contact with the first outer cylinder portion 21 and the second outer cylinder portion 22 and the rubber film portions 33 and 34, thereby preventing vibration. When the apparatus 100 is used, the vulcanized molded body A can be prevented from rattling in the radial direction (perpendicular to the axis O) on the inner peripheral side of the tubular member 40.

  As described above, according to the vibration isolator 100, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) includes the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the outer cylinder member 20 ( Since the connection is made between the concave inner peripheral surface IS of the first outer cylinder portion 21 and the second outer cylinder portion 22) (that is, the concentric concave spherical surface surrounding the bulging portion 12 of the inner cylinder member 10). In response to the input of the directional displacement, the rubber base 30 can be deformed mainly in the shearing direction. Therefore, the spring constant in the twisting direction of the vibration isolator 100 can be reduced.

  In this case, in the vulcanized molded body A, the division surface of the first outer cylinder portion 21 and the division surface of the second outer cylinder portion 22 are separated in the axis O direction by a vulcanization process (with a predetermined interval). ), The first rubber portion 31 and the second rubber portion 32 are vulcanized (see FIG. 6A). The vulcanized molded body A vulcanized and molded in such a form has a rubber base compression step (see FIGS. 6B and 7A) and a cylindrical member squeezing step (FIGS. 7A and 7). (B)) and the bending process (see FIGS. 8A and 8B), the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the axis O direction and divided. It is held and fixed by the cylindrical member 40 in a state where the surfaces are close to each other. Thereby, preliminary compression in the direction of the axis O can be applied to the first rubber part 31 and the second rubber part 32.

  Note that such provision of pre-compression in the direction of the axis O is impossible with a structure that uses the reduced diameter of the outer cylinder member that accompanies drawing as in the conventional product, and is similar to that of the vibration isolator 100. In addition, the first outer cylinder part 21 and the second outer cylinder part 22 that are relatively moved in the direction of the axis O can be provided only by adopting a structure in which the cylindrical member 40 holds and fixes the first outer cylinder part 21 and the second outer cylinder part 22. Thereby, the spring constant in the direction of the axis O can be increased, and the durability against the displacement in the direction of the axis O can be improved.

  Further, according to the vibration isolator 100, as described above, the vulcanized molded body A has the divided surface of the first outer cylinder part 21 and the divided surface of the second outer cylinder part 22 separated in the axis O direction. Vulcanization molding is performed in a state (with a predetermined interval) (see FIG. 6A), and after the vulcanization molding, the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the direction of the axis O. (Refer to FIG. 6B and FIG. 7A) Since it is configured to be held and fixed by the cylindrical member 40 (see FIG. 8B), it is between the first outer cylinder portion 21 and the second outer cylinder portion 22. The relative distance in the axis O direction (that is, the separation distance in the axis O direction between the split surfaces when held and fixed to the cylindrical member 40 (the vertical distance in FIG. 8B)) can be adjusted. Thereby, since the amount of preliminary compression in the direction of the axis O applied to the first rubber part 31 and the second rubber part 32 can be adjusted, the value of the spring constant in the direction of the axis O can be increased or decreased.

  In this case, it is necessary to adjust the amount of bending deformation of the end portion in the axis O direction of the cylindrical member 40, and the shape of the curved concave portion of the caulking die used in the bending step (see FIG. 8) is adjusted. . When the amount of bending deformation (shape of the curved concave portion) is insufficient, the dimension of the tubular member 40 in the axis O direction is changed.

  Next, a vibration isolator 200 according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted. FIG. 9A is a cross-sectional view of the vulcanized molded body B constituting the vibration isolator 200 in the second embodiment, and FIG. 9B is a cross section of the vibration isolator 200 in the second embodiment. FIG. 9A shows the vulcanized molded body B in a state before the outer cylinder member 20 is drawn by the outer cylinder drawing step.

  The vulcanized molded body B in the second embodiment has other configurations except that the configuration (formation range) of the rubber film portions 233 and 234 is different from the configuration of the rubber film portions 33 and 34 in the first embodiment. Is the same as the vulcanized molded product A in the first embodiment. The method for manufacturing the vibration isolator 200 is the same as that for the vibration isolator 100. Therefore, these descriptions are omitted.

  As shown in FIG. 9A, the rubber film portions 233 and 234 in the second embodiment are covered over the entire outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. That is, the covering range of the rubber film portions 33 and 34 in the first embodiment is a range extending from the annular portion 20a to the middle of the conical portion 20c (see FIG. 5B). The range is extended, and the rubber film portions 233 and 234 are also covered on the outer peripheral surface of the conical portion 20c and the outer peripheral surface of the cylindrical portion 20d.

  The rubber film portions 233 and 234 form a circular outer peripheral surface with the axis O as the center, as in the case of the first embodiment. The outer diameters of these rubber film parts 233 and 234 (the diameters on the outer peripheral surfaces of the rubber film parts 233 and 234) are made smaller than the inner diameter of the tubular member 40.

  According to the vibration isolator 200 in the second embodiment, the contact area with the inner peripheral surface of the tubular member 40 can be increased by expanding the covering range of the rubber film portions 233 and 234. Accordingly, the holding force of the vulcanized molded body B by the cylindrical member 40 can be secured, and therefore, after the cylindrical member 40 is drawn by the cylindrical member drawing process, the process proceeds to the bending process (see FIG. 8), it is possible to more reliably suppress the vulcanized molded body B from coming out in the direction of the axis O from the inner peripheral side of the tubular member 40.

  Next, a vibration isolator 300 according to the third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted. FIG. 10A is a cross-sectional view of the vulcanized molded body C constituting the vibration isolator 300 in the third embodiment, and FIG. 10B is a cross section of the vibration isolator 300 in the third embodiment. FIG.

  In the vulcanized molded body C in the third embodiment, the configuration of the first outer cylinder part 321 and the second outer cylinder part 322 is the same as that of the first outer cylinder part 21 and the second outer cylinder part 22 in the first embodiment. Except for the differences from the configuration, the other configurations are the same as those of the vulcanized molded body A in the first embodiment. However, the rubber film portions 233 and 234 are the same as the vulcanized molded body B in the second embodiment. The manufacturing method of the vibration isolator 300 is the same as that of the vibration isolator 100 except that the outer cylinder drawing step (see FIG. 6, drawing of the outer cylinder member 320) is omitted. . Therefore, these descriptions are omitted.

  As shown in FIG. 10 (a), the outer cylinder member 320 in the third embodiment is a solid member (a member made of aluminum die casting in the present embodiment) formed by casting, and on the inner peripheral side. A concave inner peripheral surface IS formed as a concave spherical surface is provided, and is divided into a first outer cylindrical portion 321 and a second outer cylindrical portion 322 at the central portion in the axis O direction of the concave inner peripheral surface IS. The first outer cylinder part 321 and the second outer cylinder part 322 are the same member (configuration).

  In the vulcanized molded body C, the divided surface of the first outer cylinder portion 321 and the divided surface of the second outer cylinder portion 322 are spaced apart in the axis O direction as in the case of the vulcanized molded body A in the first embodiment. Then, it is vulcanized and formed at a predetermined interval. The concave inner circumferential surface IS is formed so that the first outer cylinder part 321 and the second outer cylinder part 322 are close to each other in the divided surfaces of the outer cylinder parts 321 and 322 in the rubber base compression process (see FIG. 7). Further, by being relatively moved in the direction of the axis O, a convex spherical surface is formed concentrically with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  According to the vibration isolator 300, the rubber base 30 (the first rubber part 31 and the second rubber part 32) can be mainly deformed in the shearing direction in response to the input of the displacement in the twisting direction. The spring constant at can be reduced.

  Further, since the first outer cylinder part 321 and the second outer cylinder part 322 are relatively moved in the direction of the axis O and the divided surfaces are brought close to each other, the first outer cylinder part 321 and the second outer cylinder part 322 are held and fixed by the cylindrical member 40. Preliminary compression in the direction of the axis O can be applied to the part 31 and the second rubber part 32.

  That is, even if the outer cylinder member 320 (the first outer cylinder portion 321 and the second outer cylinder portion 322) has a shape that cannot be subjected to drawing processing (diameter reduction processing), the first rubber portion 31 and the second rubber portion 31 are provided. By preliminarily compressing the rubber part 32 in the axis O direction, the spring constant in the axis O direction can be increased, and durability against displacement in the axis O direction can be improved.

  Next, a vibration isolator 400 according to the fourth embodiment will be described with reference to FIGS. FIG. 11A is a top view of the vibration isolator 400 according to the fourth embodiment, and FIG. 11B is a cross-sectional view of the vibration isolator 400 taken along the line XIb-XIb in FIG. . In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  As shown in FIG. 11, the inner cylinder member 410 is a member formed in a rotationally symmetric shape having an axis O as a symmetric axis (rotation center), and a cylindrical shape in which an insertion hole is formed through the axis O. A shaft portion 411 and a spherical bulging portion 412 that bulges radially outward from the outer peripheral surface of the shaft portion 411 are formed integrally from a metal material. The bulging portion 412 is disposed in the center of the shaft portion 411 in the axis O direction (the center in the vertical direction in FIG. 11B), and the center of the convex spherical surface of the bulging portion 412 is on the axis O of the shaft portion 411. To position.

  The outer cylinder member 420 is divided into a first outer cylinder part 421 and a second outer cylinder part 422 at the center in the axis O direction. Here, with reference to FIG. 12, the detailed structure of the outer cylinder member 420 is demonstrated. In addition, since the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 are the same members (structure), and are only members from which a name differs, the 1st outer cylinder part 421 is demonstrated below, The description of the second outer cylinder portion 422 is omitted.

  12A is a top view of the first outer cylinder portion 421, and FIG. 12B is a cross-sectional view of the first outer cylinder portion 421 taken along the line XIIb-XIIb of FIG. 12A. FIG. 12 shows a state before drawing (see FIG. 15) in the outer cylinder drawing process.

  As shown in FIG. 12, the first outer cylinder portion 421 is a member obtained by forming a plate-like metal material (steel material in the present embodiment) having a constant plate thickness into a container shape by pressing, It is formed in rotational symmetry with the axis O as the axis of symmetry (rotation center). In addition, the point which does not need to form the ditch | groove for enabling a drawing process like the conventional product with respect to the 1st outer cylinder part 421, and the effect are the 1st outer cylinder parts 21 in 1st Embodiment. Since this is the same, the description thereof is omitted.

  The first outer cylinder portion 421 is located on one end side in the axis O direction (upper side in FIG. 12B), and has a cylindrical portion having a substantially constant diameter (inner diameter and outer diameter), and the cylindrical portion. And the diameter is gradually enlarged toward the dividing surface (lower end surface in FIG. 12 (b)) and the cross-sectional shape is curved in an arc shape.

  The first outer cylinder portion 421 has an inner diameter dimension of the cylindrical portion (that is, an opening at the end of the first outer cylinder portion 421 in the direction of the axis O in the state before being drawn by an outer cylinder drawing step described later). The minimum inner diameter dimension in FIG. 12B (upper side) is made smaller than the maximum outer diameter dimension in the bulging portion 412 of the inner cylinder member 410 (see FIG. 13B).

  A plurality of (four in the present embodiment) through-holes 421a are formed through the region where the cross-sectional shape is curved in an arc shape at regular intervals in the circumferential direction. Further, the inner peripheral surface of the portion curved in an arc shape is a concave inner peripheral surface IS surrounding the bulging portion 412 of the inner cylinder member 410. The concave inner circumferential surface IS is brought closer to the concave spherical surface concentric with the convex spherical surface in the bulging portion 412 of the inner cylindrical member 410 by performing drawing in the outer cylindrical drawing step (see FIG. 14). It is done.

  Returning to FIG. The cylindrical member 440 has the same configuration as that of the cylindrical member 40 in the first embodiment except that the formation of the chamfered surface 40a is omitted (see FIGS. 4 and 16A). Is omitted. In addition, in FIG. 11, the cylindrical member 440 after drawing by the cylindrical member drawing process (refer FIG. 16) is illustrated.

  An interposed member 450 is interposed between the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422. The interposed member 450 is a member for restricting the first outer cylinder part 421 and the second outer cylinder part 422 from moving in the direction in which the divided surfaces are brought close to each other in the cylindrical member 440. Here, with reference to FIG. 13, the detailed structure of the interposed member 450 is demonstrated.

  13A is a top view of the interposed member 450, and FIG. 13B is a cross-sectional view of the interposed member 450 taken along line XIIIb-XIIIb in FIG. In FIG. 13, for easy understanding, a state where the two divided members (interposition members 450) are separated from each other is illustrated.

  As shown in FIG. 13, the interposition member 450 is a member formed in a cylindrical shape from a metal material (in this embodiment, a steel material), and has two phases (FIG. 13A) whose phases are different by 180 degrees. The upper part and the lower part are divided into two parts. Therefore, since the two members constituting the interposed member 450 have the same shape (configuration), the types of components can be reduced accordingly.

  The plate thickness dimension of the interposed member 450 is set to the same plate thickness dimension as the outer cylinder member 420 (the first outer cylinder portion 421 and the second outer cylinder portion 422), and two members constituting the interposed member 450 The diameter (inner diameter and outer diameter) of the cylinder obtained by bringing the divided surfaces into contact with each other is the diameter (the lower side surface in FIG. 12 (b)) of the first outer cylinder portion 421 and the second outer cylinder portion 422. The inner diameter and the outer diameter). Therefore, in the assembled state of the vibration isolator 400, the end surface of the interposed member 450 faces the split surface of the first outer cylinder portion 421 and the second outer cylinder portion 422, and is described later on the inner peripheral surface side of the interposed member 450. A space SP is secured (see FIG. 11B).

  Next, a method for manufacturing the vibration isolator 400 will be described with reference to FIGS. First, with reference to FIG. 14, the manufacturing method of the vulcanization molded object D is demonstrated, and the structure of the rubber base | substrate 430 is also demonstrated. FIG. 14A is a side view of the vulcanized molded body D, and FIG. 14B is a cross-sectional view of the vulcanized molded body D along the line XIVb-XIVb in FIG. 14A.

  As shown in FIG. 14, the vulcanized molded body D includes an inner cylinder member 410 and an outer cylinder member 420 (a first outer cylinder part 421 and a second outer cylinder part 422), as in the case of the first embodiment. Is installed in the vulcanization mold, and the rubber base 430 (the first rubber portion 431 and the second rubber portion 432) is vulcanized to form the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 420 (first outer cylinder). The part 421 and the inner peripheral surface of the second outer cylinder part 422) are connected by a rubber base 430 to be manufactured.

  In this case, the vulcanization mold is provided with an intermediate mold that is located in the center of the inner cylinder member 410 in the direction of the axis O (the vertical direction in FIG. 14 (b)) and has an annular shape after the mold clamping. The inner peripheral front end edge of the middle mold faces the outer circumferential surface (top) of the bulging portion 412 with a predetermined interval, and the upper and lower surfaces of the middle mold are the first outer cylinder portion 421 and the second outer cylinder portion 422. Support the split surface. In addition, the support part (not shown) by the middle mold | type of this division surface is intermittently arrange | positioned in the circumferential direction.

  Due to the intermediate mold, the first outer cylinder part 421 and the second outer cylinder part 422 are installed in the vulcanization mold with their divided surfaces spaced apart in the direction of the axis O, and the rubber base 430 is the first rubber. The part 431 and the second rubber part 432 are vulcanized and molded into two parts in the direction of the axis O. That is, the vulcanized molded body D has a space between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432 (and the dividing surface of the first outer cylinder portion 421 and the division of the second outer cylinder portion 422). A space SP having a shape corresponding to the middle size (in the present embodiment, a U-shaped cross section) is formed between the two surfaces.

  The first rubber portion 431 is a portion that connects the outer peripheral surface of the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the first outer cylindrical portion 421, and the second rubber portion 432 is the inner cylindrical member 410. The outer peripheral surface of the bulging portion 412 and the concave inner peripheral surface IS in the second outer cylinder portion 422 are connected to each other.

  The rubber base 430 includes rubber film portions 431 a and 431 b that are covered on the outer peripheral surface of the first outer cylinder portion 421. The rubber film portions 431a and 431b are two belt-like films that are continuous in the circumferential direction. The rubber film portion 431a is passed through the through hole 421a of the first outer cylinder portion 421, and the rubber film portion 431b is the first outer cylinder. The first rubber portions 431 are connected to each other through the dividing surface of the portion 421.

  In the present embodiment, since the rubber film portion 431b employs a configuration that continues to the first rubber portion 431 via the dividing surface of the first outer cylinder portion 421, in addition to the through hole 421a, a rubber film is further provided. There is no need to form a through hole in the first outer cylinder part 421 for connecting the part 431b to the first rubber part 431. Therefore, since formation of a through-hole can be suppressed to the minimum, the rigidity of the 1st outer cylinder part 421 can be ensured by that much, and the durable improvement can be aimed at.

  Here, the covering range of the rubber film portions 431a and 431b is partial, and there is a rubber film portion in the region above the rubber film portion 431a (upper side in FIG. 13B) and between the rubber film portions 431a and 431b. 431a and 431b are not covered (that is, the outer peripheral surface of the first outer cylinder portion 421 is exposed). Thereby, in the outer cylinder drawing step (see FIG. 14), the outer peripheral surface of the first outer cylinder part 421 can be directly pressed by a drawing die (not shown) without using the rubber film parts 431a and 431b. Drawing can be performed with high accuracy.

  The rubber base 430 includes rubber film portions 432 a and 432 b that are provided on the outer peripheral surface of the second outer cylinder portion 422. The rubber film portions 432a and 432b are configured in the same manner as the rubber film portions 431a and 431b, respectively, and thus description thereof is omitted.

  With reference to FIG.15 and FIG.16, the assembly method which assembles the vibration isolator 400 from the vulcanization molded object D and the cylindrical member 440 is demonstrated. In the first embodiment (anti-vibration device 100), the rubber base 30 (the first rubber part 31 and the second rubber part 32) is compressed in the axis O direction by the rubber base compression step (see FIG. 7). In the fourth embodiment (anti-vibration device 400), the rubber base compression step is omitted.

  FIG. 15A is a cross-sectional view of the vulcanized molded body D in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 15B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding D in the state.

  As shown in FIG. 15, in the vulcanized molded body D, in the outer cylinder drawing step, the first outer cylinder part 421 and the second outer cylinder part 422 are reduced in diameter from the outer diameter D401 to the outer diameter D402 (D402 < D401). Thereby, preliminary compression in the radial direction (perpendicular to the axis O) can be applied to the rubber base 430 (the first rubber part 431 and the second rubber part 432). The configuration and operation of the drawing die are the same as in the case of the first embodiment, and a description thereof will be omitted.

  The vulcanized molded body D is vulcanized and molded so that the interposed member 450 can be disposed in the space SP (between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422). (See FIG. 16 (a)).

  FIG. 16A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 440 in a state before the cylindrical member 440 is subjected to the drawing process in the cylindrical member drawing process, and FIG. FIG. 5 is a cross-sectional view of the vibration isolator 400 in a state after the cylindrical member 440 has been subjected to drawing processing in the cylindrical member drawing step.

  As shown in FIG. 16, in the fourth embodiment, since the rubber base compression step is omitted, the vulcanized molded body D is inserted into the cylindrical member 440 along the axis O direction, and the vulcanized molded body D is inserted. After installation on the inner peripheral side of the cylindrical member 440 (FIG. 16A), the cylindrical member 440 is drawn (FIG. 16B) in the cylindrical member drawing step.

  As shown in FIG. 16 (a), the vulcanized molded body D is inserted into the cylindrical member 440. The space SP (the split surface of the first outer cylindrical portion 421 and the second outer cylindrical portion 422) is inserted into the vulcanized molded body D. This is performed in a state in which the interposition member 450 is mounted between the divided surfaces of the two. In this case, since the two members constituting the interposed member 450 have the same shape as each other, it is not necessary to consider the directionality, and the mounting workability can be improved.

  In this way, the interposed member 450 is formed as a separate member from the first outer cylinder portion 421 and the second outer cylinder portion 422. Therefore, the vulcanized molded body D in which the first outer cylinder part 421 and the second outer cylinder part 422 and the inner cylinder member 410 are connected by the first rubber part 431 and the second rubber part 432 is added by the vulcanization mold. After the vulcanization molding, the interposed member 450 may be attached to the vulcanization molding D. That is, in the structure of the vulcanization mold (for example, the middle mold splitting structure) of the portion that forms the space SP between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432, the interposed member 450. Therefore, the structure of the vulcanization mold can be simplified.

  In the cylindrical member drawing step, two-stage drawing is performed on the cylindrical member 440. That is, the entire cylindrical member 440 is reduced from the outer diameter D403 to the outer diameter D404 by the first stage drawing (D404 <D403). Next, by the second stage drawing process, the cylindrical member 440 has the first outer cylinder portion 421 and the second outer cylinder at the one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction. The diameter of the portion 422 is reduced to a shape close to the outer peripheral surface of the concave inner peripheral surface IS of the concave inner peripheral surface IS (that is, a portion where the cross-sectional shape is curved in an arc) (inward in the radial direction in a cross-sectional view). Bend). As a result, the tubular member 440 is mounted on the vulcanized molded body D, and the assembly thereof (manufacture of the vibration isolator 400) is completed.

  In the vibration isolator 400 that has been assembled, as shown in FIG. 16B, in the second stage of drawing, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are radially inward. Along with the deformation, the upper and lower end surfaces (in the direction of the axis O) of the interposed member 450 are clamped and held from above and below by the divided surface of the first outer cylinder portion 421 and the divided surface of the second outer cylinder portion 422. .

  The first stage drawing and the second stage drawing may be performed by different drawing dies, or may be performed by the same drawing dies. When the same drawing mold is used, the first stage drawing and the second stage drawing may proceed simultaneously.

  In the cylindrical member squeezing step, the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed radially inward by the inner peripheral surface of the cylindrical member 440, and the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed. A predetermined fastening allowance (in the present embodiment, about 0.01 mm to 0.02 mm in radius) is given to the cylindrical portion 422. Thereby, the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 can be firmly hold | maintained in the cylindrical member 440. FIG. In this case, the inner peripheral surface of the tubular member 440 and the rubber film portions 431a to 432b are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 431a to 432b.

  As shown in FIG. 16A, the inner diameter of the cylindrical member 440 is the outer cylinder member 420 (first outer cylinder) after the drawing process (see FIG. 15B) by the outer cylinder drawing process. Part 421 and second outer cylinder part 422) are made larger than the outer diameter D402. In the present embodiment, the inner diameter of the tubular member 440 is made larger than the maximum outer diameter of the vulcanized molded body D (the outer diameter on the outer peripheral surface of the rubber film portions 431b and 432b). Thereby, in the assembly work of the vibration isolator 400, the work of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the tubular member 440 can be efficiently performed.

  However, the inner diameter of the cylindrical member 440 is larger than the outer diameter D402 of the outer cylindrical member 420 and smaller than the maximum outer diameter of the vulcanized molded body D (the diameter on the outer peripheral surface of the rubber film portions 431b and 432b). The rubber film portions 431b and 432b may be press-fitted while being elastically deformed. The processing amount of the drawing process applied to the cylindrical member 440 can be suppressed, and the yield can be improved and the processing cost can be reduced.

  In addition, since the rubber film portions 431a to 432b are covered on the outer peripheral surfaces of the first outer cylinder portion 421 and the second outer cylinder portion 422, as in the case of the first embodiment, a friction coefficient is ensured, The shortage of the fastening allowance due to the spring back of the tubular member 440 can be compensated by the compressive force due to the elastic recovery of the rubber film portions 431a to 432b. Therefore, even if the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422 are separated from each other, a holding force against movement in the axis O direction can be ensured. Thereby, when a large displacement is input in the direction of the axis O, the first outer cylinder portion 421 and the second outer cylinder portion 422 are prevented from moving in the cylindrical member 440 in a direction in which the divided surfaces are brought close to each other. it can.

  As described above, according to the vibration isolator 400, the rubber base compression step is omitted, and the divided surface of the first rubber part 431 and the divided surface of the second rubber part 432 are separated from each other in the axis O direction. The first outer cylinder portion 421 and the second outer cylinder in a state in which the space SP is formed between them (that is, the first rubber portion 431 and the second rubber portion 432 are not preliminarily compressed in the direction of the axis O). The portion 422 is held and fixed by the cylindrical member 440.

  Thus, by forming the space SP between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the first rubber portion 431 and the first rubber portion 431 in the twisting direction corresponding to the space SP. The compression component of the first rubber part 431 and the second rubber part 432 in the axis O direction while suppressing the shear component of the two rubber parts 432 and the compression component of the first rubber part 431 and the second rubber part 432 in the direction perpendicular to the axis O Can be secured. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  On the other hand, in such a structure in which the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the space SP is formed by a vulcanization mold (that is, In order to arrange the middle mold), it is necessary to separate the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 in the axis O direction. However, when the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 are separated in the axis O direction, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected. There is a risk of moving in the direction in which the divided surfaces are brought close to each other.

  On the other hand, according to the vibration isolator 400, since the interposed member 450 is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, the first rubber part The first outer cylinder portion 421 and the second outer cylinder portion 422 move in a direction in which the respective division surfaces are brought close to each other while ensuring the space SP between the division surface of 431 and the division surface of the second rubber portion 432. Can be regulated by the interposed member 450.

  Further, the portions on one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction of the cylindrical member 440 are the concave inner peripheral surface IS of the first outer cylinder portion 421 and the second outer cylinder portion 422. The cylindrical member 440 is reduced in diameter so as to be in close contact with the outer peripheral surface (that is, the portion where the cross-sectional shape is curved in an arc shape) (bent inward in the radial direction in the cross-sectional view). On the other hand, the movement of the first outer cylinder portion 421 and the second outer cylinder portion 422 in the direction in which the divided surfaces are separated from each other can also be restricted.

  That is, when the first outer cylinder part 421 and the second outer cylinder part 422 move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the interposed member 450 and the divided surfaces are separated from each other. In the case of moving in the direction, the movement can be restricted by a portion of the cylindrical member 440 on one end side in the axis O direction or on the other end side in the axis O direction. Thereby, since the movement in these both directions can be controlled without relying on the friction with the inner peripheral surface of the cylindrical member 440, when the large displacement is input in the axis O direction, The second outer cylinder portion 422 can be reliably suppressed from being displaced in the axis O direction with respect to the cylindrical member 440.

  In particular, the interposition member 450 is formed into a cylindrical shape by combining two members constituting the interposition member 450, so that the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422 The range interposed between the two can be almost the entire circumference in the circumferential direction. Therefore, it can be controlled stably that the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 move to the direction which makes a mutual division surface approach.

  Further, according to the vibration isolator 400, the maximum outer diameter dimension (outer diameter at the central portion in the axis O direction) of the bulging portion 412 of the inner cylinder member 410 is the first outer cylinder portion 421 and the second outer cylinder portion 422. Is larger than the minimum inner diameter dimension (inner diameter dimension of the cylindrical portion) at the end opening in the axis O direction, so that the pressure receiving area is increased with respect to the displacement in the axis O direction, and the first rubber section 431 and The compression component of the second rubber part 432 can be ensured. As a result, the effect of increasing the spring constant in the axis O direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O.

  The relationship between the maximum outer diameter of the bulging portion 412 and the minimum inner diameter of the outer cylindrical member 420 is between the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the outer cylindrical member 420. In the conventional product in which the rubber base is continuously disposed (that is, having no space SP), the rubber base shear component in the twisting direction and the direction perpendicular to the base O are simultaneously with the compressive component of the rubber base in the axial O direction. Since the compression component of the rubber base is also increased, it is impossible to employ the compression component, and the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 as in the vibration isolator 400. Can be adopted for the first time.

  Here, the present embodiment omits the rubber base compression step (see FIG. 7) compared to the first embodiment, and pre-compresses the first rubber portion 431 and the second rubber portion 432 in the axis O direction. Although it is a technical idea not to apply, in the cylindrical member squeezing step (see FIG. 15), the first rubber portion 431 and the cylindrical member 440 are deformed on one end side in the axis O direction and the other end side in the axis O direction. The second rubber portion 432 is allowed to be compressed and deformed in the axis O direction. That is, it is sufficient that a space SP is secured between the dividing surface of the first rubber part 431 and the dividing surface of the second rubber part 432.

  FIG. 17A is a top view of the interposed member 550 in the fifth embodiment, and FIG. 17B is a top view of the interposed member 650 in the sixth embodiment. With reference to FIGS. 17A and 17B, the interposed members 550 and 650 in the fifth and sixth embodiments will be described.

  Note that the height dimension of the interposition members 550 and 650 (the vertical dimension in FIG. 17A and FIG. 17B) is the height dimension of the interposition member 450 in the fourth embodiment (FIG. 13B). ) Vertical dimension)). Further, the diameters (inner diameter and outer diameter) of the interposition members 550 and 650 when not deformed are the diameters (the lower side surface in FIG. 12B) of the first outer cylinder part 421 and the second outer cylinder part 422 (the lower side surface). The inner diameter and the outer diameter).

  As shown to Fig.17 (a), the interposed member 550 is a member formed in a cylindrical shape from a metal material (in this embodiment, steel material), and only one place in the circumferential direction is divided. Therefore, the diameter of the interposition member 550 is expanded from the parting point as a starting point (the parting part is separated in the circumferential direction in the same plane), or the interposition member 550 is twisted and deformed (the parting part is axially separated). (In FIG. 17A, the direction perpendicular to the paper surface) can be separated from each other), whereby the interposing member 550 can be easily attached to the vulcanized molded body D.

  On the other hand, since the interposition member 550 is restored to its original shape by its own elastic recovery force after mounting, the interposition member 550 is held in the space SP of the vulcanized molded body D without dropping off. Can do. Therefore, the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D into the cylindrical member 440 with the interposed member 550 can be made easy.

  As shown in FIG. 17B, the interposed member 650 is formed with a bent portion 650a at a position opposite to the part to be divided (position where the phase is changed by 180 °). The bent portion 650a is formed to be curved in a C shape when viewed from above, and assists in elastic deformation (deformation that increases the diameter or torsional deformation) of the interposed member 650. Thereby, mounting | wearing of the interposed member 650 to the vulcanization molded object D can be performed easily.

  The bent portion 650 and the vicinity thereof are arranged to be offset radially inward (center side) in the top view shown in FIG. 17B, and are circular shapes formed by the outer peripheral surface of the interposed member 650. The bent portion 650a is formed so as not to protrude outward in the radial direction from the outer shape (schematically illustrated by a two-dot chain line in FIG. 17B). Thereby, in the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D with which the interposed member 650 was mounted | worn into the cylindrical member 440 (refer Fig.16 (a)), the bending | flexion part 650a inhibits an operation | work (it catches on the cylindrical member 440). ) Can be avoided and workability can be improved.

  The bent portion 650a may be formed so as to protrude outward in the radial direction from the circular outer shape formed by the outer peripheral surface of the interposed member 650. Further, in FIGS. 17A and 17B, in order to facilitate understanding, the circumferential separation amount (interval) at the portion where the interposition members 550 and 650 are divided is schematically enlarged. The circumferential distance can be arbitrarily set according to the material and the like.

  Next, a vibration isolator 700 according to the seventh embodiment will be described with reference to FIGS. In the fourth embodiment, by mounting the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other. The vibration isolator 700 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  18A is a top view of the cylindrical member 740 according to the seventh embodiment, and FIG. 18B is a cross-sectional view of the cylindrical member 740 taken along the line XVIIIb-XVIIIb of FIG. .

  The vibration isolator 700 according to the seventh embodiment is different from the vibration isolator 400 according to the fourth embodiment only in that a restriction bulging portion 740a is formed on the tubular member 740. The assembly method is the same. Therefore, only different points will be described below.

  In the tubular member 740, a restriction bulging portion 740 a is formed to bulge inward in the radial direction on the inner peripheral surface portion at the center in the axis O direction. The restriction bulging portion 740a is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422, so that the first outer cylinder portion 421 and the second outer cylinder portion 422 are arranged. It is a part for restricting movement, and is formed in a rectangular shape in front view, and a plurality (four in the present embodiment) are arranged at equal intervals in the circumferential direction.

  FIG. 19A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 740 in a state before the cylindrical member 740 is drawn in the cylindrical member drawing process, and FIG. FIG. 10 is a partial cross-sectional view of the vibration isolator 700 in a state after the cylindrical member 740 has been subjected to drawing processing in the cylindrical member drawing step. In FIG. 19B, only a part is seen in cross section.

  As shown in FIG. 19, the vibration isolator 700 in the seventh embodiment is assembled in the same manner as the vibration isolator 400 in the fourth embodiment (see FIG. 16). After inserting the body D along the axis O direction and installing the vulcanized molded body D on the inner peripheral side of the tubular member 740 (FIG. 19A), the tubular member is subjected to drawing processing by the tubular member drawing step. This is done by applying to 740 (FIG. 19B).

  Here, as shown in FIG. 19 (a), the cylindrical member 740 has an outer diameter after the inner diameter of the restriction bulging portion 740a is subjected to drawing processing (see FIG. 15 (b)) by the outer cylinder drawing process. It is made larger than the outer diameter D402 of the cylindrical member 420 (the 1st outer cylinder part 421 and the 2nd outer cylinder part 422).

  In the present embodiment, the inner diameter of the restriction bulging portion 740a is larger than the outer diameter D402 and smaller than the maximum outer diameter of the vulcanized molded body D (the outer diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). Is done. Therefore, when the vulcanized molded body D is inserted along the axis O direction into the inner peripheral side of the tubular member 440, the rubber film portions 431b and 432b are press-fitted while being elastically deformed.

  In this case, according to the vibration isolator 700, the restriction bulge portion 740a is intermittently arranged in the circumferential direction, so that it is possible to secure a space for receiving the elastically deformed rubber film portions 431b and 432b. The workability of the operation of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the cylindrical member 740 can be improved. Further, it is possible to suppress the amount of drawing processing performed on the cylindrical member 740, thereby improving the yield and reducing the processing cost.

  However, the inner diameter of the restriction bulging portion 740a of the tubular member 740 may be larger than the maximum outer diameter of the vulcanized molded body D (the diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). The operation | work which inserts the vulcanization molded object D along the axis | shaft O direction to the inner peripheral side of the cylindrical member 740 can be performed efficiently.

  In the vibration isolator 700 that has been assembled, as shown in FIG. 19B, in the second stage drawing described above, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 740 are radially inward. The upper and lower end surfaces (in the direction of the axis O) of the restriction bulging portion 740a of the cylindrical member 740 are caused by the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422. The pressure is maintained from above and below.

  As described above, according to the vibration isolator 700, the restriction bulging portion 740a of the cylindrical member 740 is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422. Therefore, the first outer cylinder part 421 and the second outer cylinder part 422 are separated from each other while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. Can be regulated by the regulation bulge portion 740a.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 740 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  In particular, according to the present embodiment, the restriction bulging portion 740a is formed by deforming (bulging radially inward) a part of the cylindrical member 740, and restricting means (first outer cylinder). It is not necessary to add another member for configuring the portion 421 and the second outer cylinder portion 422), so that the weight can be reduced accordingly. Further, it is not necessary to add another member, and the number of parts is suppressed, so that the part cost can be reduced. Further, as in the case of the fourth embodiment (vibration isolation device 400), it is not necessary to attach the restricting means (the interposed member 450) to the vulcanized molded body D, so that the assembly cost is reduced as the process becomes unnecessary. This can reduce the product cost.

  In addition, in this way, the restriction bulging part 740a is formed as a separate member from the first outer cylinder part 421 and the second outer cylinder part 422, and thus in the case of the fourth embodiment (anti-vibration device 400). In the same manner as in the above, in the structure of the vulcanization mold (for example, the middle mold split structure) of the part that forms the space SP between the divided surface of the first rubber part 431 and the divided surface of the second rubber part 432, the restriction expansion Since it is not necessary to consider the shape or the like of the protruding portion 740a, the structure of the vulcanization mold can be simplified.

  Here, in the fourth embodiment (anti-vibration device 400), the interposed member 450 serving as the restricting unit is configured as a separate member, and therefore the dividing surfaces of the first outer cylinder part 421 and the second outer cylinder part 422 are separated. If the interposition member 450 falls off from the gap, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 700, since the restriction bulging portion 740a is formed integrally with the cylindrical member 740, the restriction means (regulation bulging portion 740a) is interposed between the divided surfaces. Can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

  Next, with reference to FIG. 20, a vibration isolator 800 according to the eighth embodiment will be described. In the fourth embodiment, by mounting the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the split surfaces are brought close to each other. The vibration isolator 800 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  Note that the vibration isolator 800 according to the eighth embodiment is different from the vibration isolator 400 according to the fourth embodiment in that a chamfered surface 840a is formed on the cylindrical member 840, and the end portion in the axis O direction of the rubber base 830. And the point that the bending process for bending the end portion in the axis O direction of the outer cylinder member 420 is added, and the other configuration and the assembling method are the same. Therefore, only different points will be described below.

  FIG. 20A is a cross-sectional view of the vulcanized molded body E and the cylindrical member 840 in a state after the cylindrical member 840 is drawn in the cylindrical member drawing step, and FIG. FIG. 10 is a cross-sectional view of the vibration isolator 800 in a state after the outer cylinder member 420 is bent in the bending step.

  As shown in FIG. 20 (a), the rubber base 830 is not covered by the outer cylinder member 420 at the end in the axis O direction, and the cylindrical portion of the first outer cylinder 421 (upper side in FIG. 20 (a)). And the internal peripheral surface of the cylindrical site | part (FIG. 20 (a) lower side) of the 2nd outer cylinder part 422 is exposed. Thereby, in the bending process described later, the cylindrical parts of the first outer cylinder part 421 and the second outer cylinder part 422 can be directly pressed by a caulking die (not shown) without using a rubber film, Bending can be performed with high accuracy.

  The cylindrical member 840 is chamfered at the corner on the outer peripheral surface side at the end portion in the axis O direction to form a chamfered surface 840a having a linear cross section. That is, the chamfered surface 840a of the cylindrical member 840 is formed on the opposite side of the chamfered surface 40a (see FIG. 4B) of the cylindrical member 40 in the first embodiment. As shown in FIG. 20A, the chamfered surface 840a of the tubular member 840 forms a flat surface perpendicular to the direction of the axis O in the state after being drawn in the tubular member drawing step. Thereby, the edge part of the outer cylinder member 420 to which the bending process was given in the bending process mentioned later can be received firmly.

  In the eighth embodiment, the vulcanized molded body E is inserted along the axis O direction on the inner peripheral side of the cylindrical member 840, and as shown in FIG. After the cylindrical member 840 is applied, the cylindrical portions of the first outer cylinder portion 421 and the second outer cylinder portion 422 are then bent radially outward in a bending step. As a result, as shown in FIG. 20B, the tubular member 840 is mounted on the vulcanized molded body E, and the assembly thereof (manufacture of the vibration isolator 800) is completed.

  The caulking die for performing the bending process is caulking for bending the end portion in the axis O direction of the cylindrical member 40 described in the first embodiment except that the direction of the curved concave portion is different. Since it is the same structure as a metal mold | die, the description is abbreviate | omitted.

  As described above, according to the vibration isolator 800, the end portions (cylindrical portions) in the axis O direction of the first outer cylinder portion 421 and the second outer cylinder portion 422 are bent outward in the radial direction, The cylindrical member 840 is locked to the end portion in the axis O direction (the chamfered surface 840a). Therefore, by this locking, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. It is possible to restrict the movement in the direction in which the divided surfaces are brought close to each other.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 840 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  Particularly, according to the present embodiment, by restricting a part of the outer cylinder member 420 (the first outer cylinder part 421 and the second outer cylinder part 422) (bending outward in the radial direction), the restricting means (Means for restricting movement of the first outer cylinder part 421 and the second outer cylinder part 422) are configured. Therefore, as in the case of the seventh embodiment (anti-vibration device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. Simplification of the structure of the vulcanization mold can be achieved.

  Next, a ninth embodiment will be described with reference to FIGS. In the fourth embodiment, by attaching the interposition member 450, the first outer cylinder part 421 and the second outer cylinder part 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other. The vibration isolator 900 in the embodiment is configured to restrict the movement without mounting a separate member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 21A is a bottom view of the first outer tube portion 921 in the ninth embodiment, and FIG. 21B is a view of the first outer tube portion 921 taken along the line XXIb-XXIb in FIG. It is sectional drawing. In addition, since the 1st outer cylinder part 921 and the 2nd outer cylinder part 922 are the members (structure) which are the same, and only a name differs, it demonstrates the 1st outer cylinder part 921 below, The description of the second outer cylinder portion 922 is omitted.

  As shown in FIG. 21, the first outer cylinder portion 921 has a restriction projection 921b from the bottom surface (the upper surface in FIG. 21 (b), that is, the divided surface) of the portion where the cross-sectional shape is curved in an arc shape. Are partially projected along the direction of the axis O. The restricting protrusion 921b is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, thereby allowing the first outer cylinder part 421 and the second outer cylinder part 422 to move. It is a part for regulation, and is formed in a rectangular shape when viewed from the front, and a plurality (two in the present embodiment) are arranged at positions that are equally spaced in the circumferential direction (that is, the phases are different by 180 °). The

  Next, the vulcanized molded body F will be described with reference to FIG. 22A is a perspective view of the outer cylinder member 920, and FIG. 22B is a side view of the vulcanized molded body F. FIG.

  Note that the vulcanized molded body F and the vibration isolator 900 in the ninth embodiment are different from the vulcanized molded body D and the vibration isolator 400 in the fourth embodiment in the first outer cylinder portion 921 and the second outer cylinder. The only difference is that the restricting protrusions 921b and 922b are formed on the portion 922, and the other configuration and assembly method are the same. Therefore, only different points will be described below.

  As in the case of the fourth embodiment (vulcanized molded body D), the vulcanized molded body F includes an inner cylindrical member 410 and an outer cylindrical member 920 (first outer cylindrical portion 921 and second outer cylindrical portion 922). Is installed in the vulcanization mold, and the rubber base 430 (the first rubber part 431 and the second rubber part 432) is vulcanized and molded, and the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 920 (first outer cylinder). The part 921 and the inner peripheral surface of the second outer cylinder part 922) are connected by a rubber base 430 to be manufactured.

  In this case, when the first outer cylinder portion 921 and the second outer cylinder portion 922 are installed in the vulcanization mold, as shown in FIG. 22 (a), the circumferential positioning is performed and the restriction protrusions 921b, 922b are arranged. It is set as the state which the projecting front end surfaces contact | abut. As a result, the position of the split surface of the middle mold that supports the split surfaces of the first outer cylinder section 921 and the second outer cylinder section 922 is set to a position corresponding to the restricting protrusions 921b and 922b (that is, the mold release direction of the middle mold is set). 22B), the space SP formed between the divided surfaces of the first rubber part 431 and the second rubber part 432 as shown in FIG. It can exist continuously over the entire circumference in the circumferential direction. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  FIG. 23A is a top view of the vibration isolator 900, and FIG. 23B is a cross-sectional view of the vibration isolator 900 along the line XXIIIb-XXIIIb in FIG.

  As shown in FIG. 23, the vibration isolator 900 according to the ninth embodiment is assembled in the same manner as the vibration isolator 400 according to the fourth embodiment (see FIG. 16). After the body F is inserted along the axis O direction and the vulcanized molded body F is installed on the inner peripheral side of the tubular member 440, the tubular member 440 is subjected to a drawing process by a tubular member drawing step. .

  As shown in FIG. 23B, the vibration isolator 900 that has been assembled is such that the one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are in the radial direction in the second stage drawing process described above. With this deformation, the restricting projection 921b of the first outer cylinder portion 921 and the restricting projection 922b of the second outer cylinder portion 922 are brought into a state in which the projecting leading end surfaces are butted in the axis O direction. .

  As described above, according to the vibration isolator 900, the restriction protrusions 921b and 922b protrude from the dividing surfaces of the first outer cylinder portion 921 and the second outer cylinder portion 922, thereby dividing the first rubber portion 431. The first outer cylinder portion 921 and the second outer cylinder portion 922 are restricted from moving in a direction in which the respective divided surfaces are brought close to each other while securing the space SP between the surface and the divided surface of the second rubber portion 432. be able to.

  In other words, the movement of the first outer cylinder portion 921 and the second outer cylinder portion 922 in the direction in which the divided surfaces are brought close to each other is regulated without depending on the friction with the inner peripheral surface of the cylindrical member 440. Therefore, the displacement of the first outer cylinder portion 921 or the second outer cylinder portion 922 relative to the cylindrical member 440 can be reliably suppressed when a large displacement is input in the direction of the axis O.

  In particular, according to the present embodiment, by restricting a part of the outer cylinder member 920 (the first outer cylinder part 921 and the second outer cylinder part 922), the restricting means (the first outer cylinder part 921 and the first outer cylinder part 921 and the second outer cylinder part 922). 2 means for restricting the movement of the outer cylindrical portion 922). Therefore, as in the case of the seventh embodiment (anti-vibration device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. Simplification of the structure of the vulcanization mold can be achieved.

  Here, in the fourth embodiment (anti-vibration device 400), the interposed member 450 serving as the restricting unit is configured as a separate member, and therefore the dividing surfaces of the first outer cylinder part 421 and the second outer cylinder part 422 are separated. If the interposition member 450 falls off from the gap, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 900, the restricting protrusions 921b and 922b are formed integrally with the first outer cylinder part 921 and the second outer cylinder part 922, so that the restricting means (the restricting protrusion 921b is provided between the divided surfaces. , 922b) can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

  FIG. 24A is a perspective view of the outer cylinder member 1020 in the tenth embodiment, and FIG. 24B is a perspective view of the outer cylinder member 1120 in the eleventh embodiment. With reference to Fig.24 (a) and FIG.24 (b), the outer cylinder members 1020 and 1120 in 10th and 11th Embodiment are demonstrated.

  The outer cylinder members 1020 and 1120 are different from the outer cylinder member 920 in the ninth embodiment in that the number of arrangement of the restriction projections 921b, 922b, and 1122b is different, or the protrusion height of the restriction projection 1122b is different. Except for this point, the other configurations are the same. Therefore, only different points will be described.

  As shown in FIG. 24 (a), the outer cylinder member 1020 in the tenth embodiment has four restricting projections 921b and 922b around the dividing surfaces of the first outer cylinder part 1021 and the second outer cylinder part 1022, respectively. Protruding at equal intervals in the direction. Thereby, since the area | region where the projecting front end surfaces of regulation protrusion 921b, 922b contact | abut can be disperse | distributed to the circumferential direction, the 1st outer cylinder part 1021 and the 2nd outer cylinder part 1022 can mutually separate a dividing surface. It is possible to stably regulate movement in the approaching direction.

  As shown in FIG. 24 (b), in the outer cylinder member 1120 in the eleventh embodiment, the restriction projections 1122b are formed only on the second outer cylinder part 1122 without the restriction projections formed on the first outer cylinder part 421. The In the present embodiment, two restricting projections 1122b are projected from the dividing surface along the axis O direction at positions where the phases are different by 180 °. The restricting protrusion 1122b is configured in the same manner as the restricting protrusions 921b and 922b except that the protruding height from the dividing surface is doubled.

  According to the outer cylinder member 1120 in the eleventh embodiment, no restriction projection is formed on the first outer cylinder part 421, so the directionality in the circumferential direction can be eliminated. Thereby, when installing the outer cylinder member 1120 in the vulcanization mold, it is not necessary to perform the circumferential alignment of the first outer cylinder member 421 and the second outer cylinder member 1122. Therefore, workability in installation work can be improved.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values given in the above embodiments are merely examples, and other numerical values can naturally be adopted. For example, values such as dimensions (outer diameters D1 to D4, D401 to D404, etc.) and fastening allowances of each component can be arbitrarily set.

  A part or all of the vibration isolator in each of the above embodiments is combined with a part or all of the vibration isolator in the other embodiment, or a part or all of the vibration isolator in the other embodiment. Alternatively, a vibration isolator may be configured.

  In the first to third embodiments, in the vulcanized molded bodies A to C, the first rubber portion 31 and the second rubber portion 32 are divided (the respective divided surfaces are separated in the axis O direction). Although the case has been described, the present invention is not necessarily limited thereto, and a part of the dividing surface of the first rubber part 31 and the dividing surface of the second rubber part 32 (the outer peripheral surface of the bulging part 12 of the inner cylinder member 10) (A part of the side) may be connected. On the other hand, in the fourth to eleventh embodiments, the case where the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 are partially connected is described, but the present invention is not necessarily limited to this. The first rubber part 431 and the second rubber part 432 may be divided.

  In the first to third embodiments, in the completed state (the state of the vibration isolator 100 to 300), the divided surfaces of the first outer cylinder portions 21 and 321 and the divided surfaces of the second outer cylinder portions 22 and 322 are separated. Although the case where it was spaced apart in the direction of the axis O has been described, the present invention is not necessarily limited to this, and in the completed state, the divided surfaces of the first outer cylinder portions 21 and 321 and the divided surfaces of the second outer cylinder portions 22 and 322 May be in contact with each other.

  That is, in the rubber base compression step, the rubber base 430 (the first rubber portion 31 and the first rubber portion 31) is moved to a position where the split surfaces of the first outer cylinder portions 21 and 321 and the split surfaces of the second outer cylinder portions 22 and 322 abut. 2) the rubber part 32) is compressed in the direction of the axis O, and in this state, the cylindrical member 40 is drawn in the cylindrical member drawing process, and in the bending process, the end of the cylindrical member 40 at the end in the axis O direction. You may manufacture the vibration isolator 100-300 so that it may be in the said state by giving a bending process.

  On the other hand, in the first to third embodiments, the rubber base compression step may be omitted. That is, after the outer cylinder squeezing process, the process may be shifted to the cylindrical member squeezing process without performing the rubber base compressing process (without providing the rubber base 430 with preliminary compression in the axis O direction).

  In each of the above embodiments, the case where the rubber film portions 33, 34, 233, 234, 431a, 431b are covered on the outer peripheral surface of the outer cylinder member 20, 320, 420, 620, 720 has been described. The rubber film portions 33, 34, 233, 234, 431 a and 431 b may be provided on the inner peripheral surface of the cylindrical members 40 and 440 instead of or in addition to this. .

  In the first to third embodiments, the case where the bending process is performed (bending process is performed on the end portion in the axis O direction of the tubular member 40) has been described. However, the present invention is not necessarily limited thereto, and the bending process is performed. You may abbreviate | omit and manufacture the vibration isolator 100-300. That is, the vulcanized molded products A to C are formed on the cylindrical member 40 by the holding force between the cylindrical member 40 that has been subjected to drawing processing in the cylindrical member drawing step and the rubber film portions 33, 34, 333, and 334. You may hold | maintain on the inner peripheral side.

  Although the description thereof is omitted in the first to third embodiments, through holes may be formed in the first outer cylinder portions 21 and 321 and the second outer cylinder portions 22 and 322. Since the fluidity of the rubber-like elastic body in the vulcanization molding process can be ensured by the through holes, the yield of the rubber film portions 33, 34, 333, 334 connected to the first rubber portion 31 and the second rubber portion 32 is increased. be able to.

  In each of the above embodiments, the description is omitted, but after the bending step, the inner cylinder members 10 and 410 are expanded in diameter (the inner cylinder member 10 is compressed in the axis O direction, and the end portion in the axis O direction is expanded. By doing so, you may give the process which expands the area of a seat surface.

  In the first, second, and fourth to eleventh embodiments, the outer cylinder squeezing step is performed (outer cylinder members 20, 420, 920, 1020, 1120 (first outer cylinder portions 21, 421, 921, 1021, 1121 and the second outer cylinder portion 22, 422, 922, 1022, 1122) are described. However, the present invention is not necessarily limited to this, and the outer cylinder drawing step is omitted, and the vibration isolator is provided. 100, 200, 400, 700, 800, 900 may be manufactured.

  Although the case where the outer cylinder member 320 is formed by casting has been described in the third embodiment, the present invention is not necessarily limited thereto, and the outer cylinder member 320 may be formed by forging or cutting, for example.

  In the fourth to eleventh embodiments, the case where the rubber base compression step is omitted has been described. However, the invention is not necessarily limited to this, and the rubber bases 430 and 830 are spared in the axis O direction by the rubber base compression step. The vibration isolator 400, 700, 800, 900 may be manufactured with compression applied.

  In the seventh embodiment, the case where the restriction bulging portion 740a is intermittently formed in the circumferential direction has been described. However, the present invention is not necessarily limited to this, and the restriction bulging portion 740a is continuously provided in the circumferential direction. It may be formed.

  In the eleventh embodiment, the case where the two restricting protrusions 1122b are protruded by changing the phase by 180 ° has been described. However, the present invention is not limited to this, and four restricting protrusions are equally spaced in the circumferential direction. You may project 1122b. In this case, the region where the projecting leading end surface of the restricting projection 1122b is in contact with the dividing surface of the first outer cylinder part 421 is dispersed in the circumferential direction, and the first outer cylinder part 421 and the second outer cylinder part 1122 are It is possible to stably regulate the movement in the direction in which the divided surfaces come close to each other.

  In the eleventh embodiment, the two restricting projections 1122b (that is, the projecting height is twice that of the restricting projections 921b and 922b) are projected from the dividing surface of the second outer cylindrical portion 1122. However, the present invention is not limited to this, and one of the two restricting projections 1122b protrudes from the dividing surface of the first outer cylinder portion and the other protrudes from the dividing surface of the second outer cylinder portion. May be provided. In this case, since the first outer cylinder part and the second outer cylinder part can be used as a common part, it is possible to reduce the part cost.

  Here, the “concave spherical surface” described in claim 1 does not require a complete spherical shape, but is formed as a concave surface disposed opposite to the convex spherical surface at least in the bulging portion of the inner cylinder member. If it is done, it is enough. Similarly, “concentric with a convex spherical surface” does not require that the centers coincide completely, and the center of the concave spherical surface is viewed from the first outer cylindrical portion and the second outer cylindrical portion, This means that it suffices if it is located on the same side as the center of the convex spherical surface.

100, 200, 300, 400, 700, 800, 900 Vibration isolator 10, 410 Inner cylinder member 12, 412 Swelling part 20, 320, 420, 920, 1020, 1120 Outer cylinder member 21, 321, 421, 921, 1021, 1121 1st outer cylinder part 22,322,422,922,1022,1122 2nd outer cylinder part 921b, 922b, 1122b Restriction protrusion (regulation means)
IS concave inner peripheral surface 30, 430, 830 Rubber base 31, 431 First rubber part 32, 432 Second rubber part 33, 333, 431a, 431b Rubber film part 34, 334, 432a, 432b Rubber film part 40, 440, 840 Cylindrical member 740a Restricted bulging portion (regulating means)
450, 550, 650 Interposition member (regulation means)
O-axis SP space

  The present invention relates to a vibration isolator, and in particular, while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased, and the first outer cylinder portion and the second portion divided into two are divided. The present invention relates to a vibration isolator capable of suppressing the movement of the outer cylinder portion in a direction in which the divided surfaces are brought close to each other.

  In the bush (vibration isolation device) used for the suspension device, the inner cylinder member and the outer cylinder member are connected by a rubber base made of a rubber-like elastic body. It is required to reduce the spring constant.

  In Patent Document 1, in order to reduce the spring constant in the twisting direction, a spherical bulging portion 4 bulging outward in the radial direction is provided at an axially intermediate portion of the inner cylinder 1 (inner cylinder member). An anti-vibration bush 101 (anti-vibration device) that forms an inner peripheral surface portion of the outer cylinder 2 (outer cylinder member) surrounding the bulging portion 4 into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 4. Disclosed.

  According to this anti-vibration bush 101, the rubber-like elastic body 3 (rubber base) is mainly formed between a convex spherical surface and a concentric concave spherical surface with respect to an input of displacement in the twisting direction. Since it can be deformed in the shearing direction, the spring constant in the twisting direction can be reduced.

JP 2008-019927 (paragraphs 0006, 0020, FIG. 1, etc.)

  However, the conventional anti-vibration bush 101 described above has a problem that it is not possible to sufficiently increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  On the other hand, as a result of diligent study, the applicant of the present application divided the rubber base into a first rubber part and a second rubber part at an axially central part in order to solve the above problems, and the first rubber. The present inventors have come up with a configuration in which a space is formed between the divided surface of the part and the divided surface of the second rubber part (not known at the time of filing this application).

  In this case, the outer cylinder member is also divided into a first outer cylinder part and a second outer cylinder part at the center in the axial direction, and the first outer cylinder part and the second outer cylinder part have their respective split surfaces in the axial direction. In a separated state, it is held and fixed by a cylindrical member.

  However, in this way, when the dividing surface of the first outer cylinder portion and the dividing surface of the second outer cylinder portion are separated in the axial direction, the first outer cylinder portion and the first outer cylinder portion are It has been found that the two outer cylinder parts move in a direction in which the divided surfaces are brought close to each other.

  The present invention has been made against the background of the above circumstances. While reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis, the spring constant in the axial direction is increased and the first divided into two parts. It aims at providing the vibration isolator which can suppress that an outer cylinder part and a 2nd outer cylinder part move to the direction which makes a mutual division surface approach.

Means for Solving the Problems and Effects of the Invention

  According to the vibration isolator of claim 1, the inner cylinder member having a spherical bulge that bulges radially outward, and the concave shape that is a concave spherical surface that surrounds the bulge of the inner cylinder member. Since it has an outer cylinder member having an inner peripheral surface and a rubber base that connects between the outer peripheral surface of the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the outer cylindrical member, Thus, the rubber substrate can be deformed mainly in the shear direction. Therefore, there is an effect that the spring constant in the twisting direction can be reduced.

  In this case, according to the first aspect, the outer cylinder member is divided into two parts in the axial direction, the first outer cylinder part and the second outer cylinder part, and the concave inner peripheral surface and the second outer cylinder part in the first outer cylinder part. The first outer cylinder part and the second outer cylinder part are connected by the first rubber part and the second rubber part, respectively, between the concave inner peripheral surface of the outer cylinder part and the outer peripheral surface of the bulging part of the inner cylinder member. Is held and fixed by a cylindrical cylindrical member disposed on the outer peripheral side.

  Therefore, after the first rubber portion and the second rubber portion are vulcanized and molded, the dividing surface of the first rubber portion and the dividing surface of the second rubber portion are separated in the axial direction so that there is a space between the dividing surfaces. In the state of being formed, the first outer cylinder part and the second outer cylinder part can be held and fixed by the cylindrical member. Thus, by forming a space between the dividing surface of the first rubber part and the dividing surface of the second rubber part, the shear component of the rubber substrate in the twisting direction and the rubber substrate in the direction perpendicular to the axis can be formed. The compression component of the rubber base in the axial direction can be ensured while suppressing the compression component. As a result, it is possible to increase the spring constant in the axial direction while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  Further, according to the first aspect, the first outer cylinder part or the second outer cylinder part is formed integrally with at least one of the first outer cylinder part and the split surface of the first outer cylinder part and the second outer cylinder part in the axial direction. Since the control projection is provided so as to partially project along the first and second outer cylindrical portions and the second outer portion while securing a space between the first rubber portion dividing surface and the second rubber portion dividing surface. It is possible to restrict the movement of the cylindrical portion in the direction in which the divided surfaces come close to each other by the restriction protrusion. That is, since the movement in such a direction can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member, when the large displacement is input in the axial direction, the first outer cylinder portion or the second outer cylinder It can suppress reliably that a part shifts position with respect to a cylindrical member.

  In the rubber base, the first rubber portion and the second rubber portion do not need to be completely divided (divided) in the axial direction, and it is sufficient that the rubber base is divided in the axial direction at least on the outer cylinder member side. Therefore, the 1st rubber part and the 2nd rubber part may be connected by the inner cylinder member side (it does not need to be divided in the direction of an axis). That is, the first rubber part and the second rubber part may be connected by a part of the rubber base that covers the outer peripheral surface of the inner cylinder member.

  Moreover, since the maximum outer diameter dimension in the bulging part of the inner cylinder member is made larger than the minimum inner diameter dimension in the axial end opening of the first outer cylinder part and the second outer cylinder part, With respect to the displacement, the pressure receiving area can be increased to ensure the compression component of the rubber base. As a result, the effect of increasing the spring constant in the axial direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  Note that, in the conventional product in which the rubber base is continuously disposed between the bulging portion of the inner cylinder member and the concave inner peripheral surface of the outer cylinder member, the configuration of the first aspect is the rubber in the axial direction. Simultaneously with the compressive component of the base, the shear component of the rubber base in the twisting direction and the compressive component of the rubber base in the direction perpendicular to the axis also increase, and thus cannot be employed. This is possible for the first time by forming a space between the dividing surface and the dividing surface of the second rubber part, thereby ensuring the compression component of the rubber base in the axial direction and the rubber in the twisting direction. The shear component of the substrate and the compression component of the rubber substrate in the direction perpendicular to the axis can be suppressed. That is, the spring constant in the axial direction can be increased while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis.

  In addition, since it is provided with a restricting protrusion that is integrally formed with at least one of the first outer cylinder portion or the second outer cylinder portion and that partially protrudes along the axial direction from the dividing surface, the product cost is reduced. It is possible to improve the reliability of the effect of suppressing the displacement of the first outer cylinder part and the second outer cylinder part with respect to the cylindrical member.

  That is, since the restricting projection is formed integrally with at least one of the first outer cylinder portion or the second outer cylinder portion, the restricting projection is formed separately from the first outer cylinder portion and the second outer cylinder portion. In comparison, the number of parts can be reduced. As a result, it is possible to reduce the part cost and the assembly man-hour (installation man-hour for the vulcanization mold), and the product cost can be reduced accordingly.

  Further, when the restriction projection is formed separately from the first outer cylinder portion and the second outer cylinder portion, the restriction projection is formed between the division surface of the first outer cylinder portion and the division surface of the second outer cylinder portion. If it falls off and the restricting protrusion is not interposed between the divided surfaces, the effect of suppressing the displacement may not be exhibited. On the other hand, if the restriction protrusion is integrally formed on at least one of the first outer cylinder part or the second outer cylinder part as in claim 1, the dividing surface of the first outer cylinder part and the second outer cylinder are formed. Since the state in which the restricting protrusion is interposed between the divided surfaces of the parts can be maintained without being dropped, the positional deviation suppressing effect can be surely exhibited and the reliability can be improved.

Further, since the restricting projection is partially projected from at least one split surface of the first outer cylinder part or the second outer cylinder part, the first outer cylinder part and the second outer cylinder part are vulcanized by a vulcanization mold. (2) When connecting the outer cylinder part and the inner cylinder member by the first rubber part and the second rubber part, the dividing surface of the first rubber part and A vulcanization mold can be disposed between the divided surfaces of the second rubber part. Accordingly, a space is formed between the divided surface of the first rubber portion and the divided surface of the second rubber portion while the effect of suppressing the displacement of the first outer cylinder portion and the second outer cylinder portion can be exhibited by the restricting projection portion. There is an effect that can be done.
Further, the cylindrical member is subjected to drawing processing, and one end side in the axial direction and the other end side in the axial direction of the cylindrical member become the back side of the concave inner peripheral surface of the first outer cylinder portion and the second outer cylinder portion. Since it is formed in a shape reduced in diameter along the outer peripheral surface, the first outer cylinder part and the second outer cylinder part are only moved in the direction in which the divided surfaces come close to the cylindrical member. In addition, there is an effect that it is possible to restrict the movement in the direction of separating the divided surfaces.
That is, when the first outer cylinder part and the second outer cylinder part move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the restriction protrusions, and the movement is made in the direction in which the divided surfaces are separated from each other. In that case, the movement can be restricted by one axial end side or the other axial end side of the cylindrical member. As a result, the movement in both directions can be regulated without relying on the friction with the inner peripheral surface of the cylindrical member. Therefore, when a large displacement is input in the axial direction, the first outer cylinder portion or the second outer It is possible to reliably suppress the displacement of the tubular portion with respect to the tubular member.

  According to the vibration isolator of claim 2, in addition to the effect of the vibration isolator according to claim 1, the first rubber part while suppressing the occurrence of peeling and cracking of the first rubber part and the second rubber part. Further, there is an effect that pre-compression can be imparted to the second rubber portion in the radial direction (perpendicular to the axis).

  Here, the vibration isolator imparts preliminary compression in the radial direction to the rubber base in order to ensure the durability thereof. The provision of the precompression in the radial direction to the rubber base is usually performed by drawing the outer cylinder member. In this case, in the structure in which a concave spherical surface is formed on the inner peripheral surface portion of the outer cylinder member (outer cylinder) as in the conventional product, the concave spherical surface and the concave spherical surface are not formed. A difference in thickness occurs between the portions and the thickness of the portion where the concave spherical surface is not formed becomes thick, so that drawing of the outer cylinder member becomes difficult.

  Therefore, in the conventional product, a plurality of concave grooves extending in the axial direction and having a depth equivalent to that of the concave spherical surface are formed on the inner peripheral surface of the outer cylinder member in the circumferential direction. As a result, the outer cylinder member undergoes drawing deformation so that the groove width of each concave groove becomes narrow with drawing, so there is a difference in thickness and the thickness of the portion where the concave spherical surface is not formed. Drawing can be performed even if the thickness is large.

  However, with this conventional product, the spring constant in the twisting direction can be reduced, but by forming a concave groove in the outer cylindrical member to enable drawing, the rubber base (rubber-like elastic body) can be pre-compressed. Since it is a structure to be applied, when the outer cylinder member is drawn, deformation concentrates on the concave groove, and the rubber-like elastic body is peeled off at the portion bonded to the concave groove, and the groove width is narrowed. Cracks are generated in the rubber substrate between the concave grooves.

  On the other hand, according to the second aspect, the first outer cylinder part and the second outer cylinder part are held and fixed by the cylindrical member in a state where the first outer cylinder part and the second outer cylinder part are drawn. Therefore, there is an effect that preliminary compression in the radial direction can be applied to the first rubber portion and the second rubber portion. In addition, since the first outer cylinder part and the second outer cylinder part are formed from a material having a constant plate thickness into a shape having a concave inner peripheral surface, the first outer cylinder part and the second outer cylinder part can be drawn. It is not necessary to form a concave groove for Therefore, there is an effect that radial compression can be applied to the first rubber portion and the second rubber portion while suppressing occurrence of peeling and cracking of the first rubber portion and the second rubber portion.

  That is, in the present invention, since the cylindrical member holds and fixes the first outer cylinder part and the second outer cylinder part, the shape as an attachment site to the mating member (for example, press-fitting into the press-fitting hole of the suspension arm is possible. The outer shape) can be carried by the cylindrical member, and the first outer cylinder portion and the second outer cylinder portion do not need to take into account the shape as an attachment site to the mating member. Therefore, the first outer cylinder part and the second outer cylinder part can be formed from a material having a constant plate thickness, for example, by pressing, and as a result, the first outer cylinder part and the second outer cylinder part can be formed without providing a concave groove. The second outer cylinder portion can be drawn.

  According to the vibration isolator of claim 3, in addition to the effect of the vibration isolator according to claim 1 or 2, the cylindrical member is subjected to drawing processing, that is, the first outer cylinder portion and the second outer cylinder portion. Since the first outer cylinder portion and the second outer cylinder portion are held and fixed by the cylindrical member by tightening the outer peripheral surface side of the outer cylinder portion by the inner peripheral surface side of the cylindrical member, the holding and fixing are easily performed. There is an effect that can be. Further, since the inner diameter of the cylindrical member before the drawing process can be made larger than the outer diameters of the first outer cylinder part and the second outer cylinder part, the first outer cylinder part and the second outer cylinder in the assembly process. There is an effect that the operation of inserting the portion into the inner peripheral side of the tubular member along the axial direction can be efficiently performed.

  In this case, when the outer peripheral surface of the first outer cylinder part and the second outer cylinder part and the inner peripheral surface of the cylindrical member are in direct contact (that is, the metal materials are in contact with each other), the friction between the two It is difficult to secure the coefficient. Moreover, since the member located in the outer peripheral side becomes large, the spring back after a drawing process becomes difficult to ensure a fastening allowance. Therefore, there is a possibility that the first outer cylinder part and the second outer cylinder part may come out in the axial direction from the cylindrical member.

  On the other hand, in the present invention, a rubber film portion composed of a rubber-like elastic body is provided on at least a part of at least one of the outer peripheral surface of the first outer cylinder portion and the second outer cylinder portion or the inner peripheral surface of the cylindrical member. Since it is covered, the friction coefficient can be secured by the intervention of the rubber film portion. Further, the rubber film portion is interposed, so that the shortage of the tightening allowance due to the spring back of the cylindrical member can be compensated by the compressive force due to the elastic recovery of the rubber film portion. Therefore, there is an effect that it is possible to secure a holding force against the axial withdrawal and to prevent the first outer cylinder portion and the second outer cylinder portion from coming out of the cylindrical member in the axial direction.

  According to the third aspect, since the cylindrical member is drawn, the first outer cylindrical portion and the second outer cylindrical portion are radially arranged (perpendicular to the axis) on the inner peripheral side of the cylindrical member. There is an effect that it is possible to suppress rattling.

(A) is a top view of the vibration isolator in the 1st reference example of this invention, (b) is sectional drawing of the vibration isolator in the Ib-Ib line | wire of Fig.1 (a). (A) is a top view of an inner cylinder member, (b) is sectional drawing of the inner cylinder member in the IIb-IIb line | wire of Fig.2 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the IIIb-IIIb line | wire of Fig.3 (a). (A) is a top view of a cylindrical member, (b) is sectional drawing of the cylindrical member in the IVb-IVb line | wire of Fig.4 (a). (A) is a top view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the Vb-Vb line | wire of Fig.5 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of a vulcanization molded object and a cylindrical member in the state where a rubber base was compressed in the direction of an axis in a rubber base compression process, (b) is a cylindrical member in a cylindrical member squeezing process. It is sectional drawing of a vulcanization molded object and a cylindrical member in the state after drawing processing. (A) is sectional drawing of the vulcanization molded object and a cylindrical member in the state before a bending process is given in a bending process, (b) is in the state after a bending process was given in the bending process. It is sectional drawing of a vulcanization molded object and a cylindrical member. (A) is sectional drawing of the vulcanization molded object B which comprises the vibration isolator in a 2nd reference example , (b) is sectional drawing of the vibration isolator in a 2nd reference example . (A) is sectional drawing of the vulcanization molded object which comprises the vibration isolator in a 3rd reference example, FIG.10 (b) is sectional drawing of the vibration isolator in a 3rd reference example . (A) is a top view of the vibration isolator in a 4th reference example , (b) is sectional drawing of the vibration isolator in the XIb-XIb line | wire of Fig.11 (a). (A) is a top view of a 1st outer cylinder part, (b) is sectional drawing of the 1st outer cylinder part in the XIIb-XIIb line | wire of Fig.12 (a). It is a top view of an interposed member, (b) is sectional drawing of the interposed member in the XIIIb-XIIIb line | wire of Fig.13 (a). (A) is a side view of a vulcanization molded object, (b) is sectional drawing of the vulcanization molded object in the XIVb-XIVb line | wire of Fig.14 (a). (A) is a sectional view of a vulcanized molded body in a state before being drawn in the outer cylinder drawing step, and (b) is a vulcanization in a state after being drawn in the outer cylinder drawing step. It is sectional drawing of a molded object. (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is sectional drawing of the vibration isolator in the state after the drawing process was given to the cylindrical member. (A) is a top view of the interposed member in the fifth reference example , and (b) is a top view of the interposed member in the sixth reference example . (A) is a top view of the cylindrical member in a 7th reference example , (b) is a sectional view of the cylindrical member in the XVIIIb-XVIIIb line of Drawing 18 (a). (A) is sectional drawing of the vulcanization molded object and a cylindrical body in the state before a cylindrical member is drawn in a cylindrical member drawing process, (b) is a cylindrical member drawing process. It is a fragmentary sectional view of the vibration isolator in the state after the drawing process was given to the cylindrical member. It is a figure which shows the vibration isolator in an 8th reference example , (a) is sectional drawing of a vulcanization molded object and a cylindrical member in the state after a cylindrical member was drawn in the cylindrical member drawing process (B) is sectional drawing of the vibration isolator in the state after the bending process was given to the outer cylinder member in the bending process. (A) is a bottom view of the 1st outer cylinder part in 1st Embodiment, (b) is sectional drawing of the 1st outer cylinder part in the XXIb-XXIb line | wire of Fig.21 (a). (A) is a perspective view of an outer cylinder member, (b) is a side view of a vulcanization molded object. (A) is a top view of a vibration isolator, (b) is sectional drawing of the vibration isolator in the XXIIIb-XXIIIb line | wire of Fig.23 (a). (A) is a perspective view of the outer cylinder member in 2nd Embodiment, (b) is a perspective view of the outer cylinder member in 3rd Embodiment.

Hereinafter, preferred reference examples and embodiments of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the vibration isolator 100 will be described with reference to FIG. FIG. 1A is a top view of a vibration isolator 100 according to a first reference example of the present invention, and FIG. 1B is a cross-sectional view of the vibration isolator 100 taken along line Ib-Ib in FIG. It is.

  As shown in FIG. 1, a vibration isolator 100 is a vibration isolating bush used for an automobile suspension device (suspension device), and is arranged on a cylindrical inner cylinder member 10 and an outer peripheral side of the inner cylinder member 10. The outer cylinder member 20 is provided, the inner cylinder member 10 and the outer cylinder member 20 are connected to each other, and the rubber base 30 formed of a rubber-like elastic body is disposed on the outer peripheral side of the outer cylinder member 20. And a tubular member 40 having a tubular shape.

The vibration isolator 100 is configured such that the end surface in the axial O direction of the inner cylinder member 10 is clamped and fixed between a pair of clamping portions in the bracket of the suspension member via an attachment bolt inserted into the inner cylinder member 10. The shaped member 40 is press-fitted into a press-fitting hole at one end of the suspension arm (in this reference example , the lower arm), and is thereby mounted on the suspension device of the automobile.

  Next, with reference to FIGS. 2 to 4, the detailed configuration of each part constituting the vibration isolator 100 will be described. First, with reference to FIG. 2, the detailed structure of the inner cylinder member 1 is demonstrated. 2A is a top view of the inner cylinder member 10, and FIG. 2B is a cross-sectional view of the inner cylinder member 10 taken along the line IIb-IIb in FIG. 2A.

  As shown in FIG. 2, the inner cylinder member 10 includes a cylindrical shaft part 11 in which an insertion hole through which a mounting bolt is inserted is formed along the axis O, and a radially outer side from the outer peripheral surface of the shaft part 11. And a spherical bulging portion 12 that bulges toward the direction, and these are integrally formed of a metal material. Note that the shaft portion 11 and the bulging portion 12 may be configured separately from different materials (for example, the bulging portion 12 is a resin material).

  The bulging portion 12 is disposed at the center of the shaft portion 11 in the axis O direction (the center in the vertical direction in FIG. 2B), and the center of the convex spherical surface of the bulging portion 12 is on the axis O of the shaft portion 11. To position. That is, the inner cylinder member 10 is formed in a rotationally symmetric shape with the axis O as the axis of symmetry (rotation center).

  With reference to FIG. 3, the detailed structure of the outer cylinder member 20 is demonstrated. Fig.3 (a) is a top view of the 1st outer cylinder part 21, FIG.3 (b) is sectional drawing of the 1st outer cylinder part 21 in the IIIb-IIIb line | wire of Fig.3 (a). FIG. 3 shows a state before the drawing process (see FIG. 6) in the outer cylinder drawing process.

  In addition, the outer cylinder member 20 is divided into two at the center part in the axis O direction into a first outer cylinder part 21 and a second outer cylinder part 22 (see FIG. 1). Since the first outer cylinder portion 21 and the second outer cylinder portion 22 are the same member (configuration) and are different only in names, the first outer cylinder portion 21 will be described below. Description of the 2 outer cylinder part 22 is abbreviate | omitted.

As shown in FIG. 3, the first outer cylinder portion 21 is a member obtained by forming a plate-like metal material (steel material in the present reference example ) having a constant plate thickness into a vessel shape by pressing. It is formed in rotational symmetry with O as the axis of symmetry (rotation center).

  In addition, since the 1st outer cylinder part 21 is formed from a raw material with a fixed plate | board thickness, it is not necessary to form the ditch | groove for enabling drawing like the conventional product. Therefore, in the outer cylinder drawing process (see FIG. 6) in which the first outer cylinder portion 21 and the second outer cylinder portion 22 are drawn, the occurrence of peeling and cracking of the first rubber portion 31 and the second rubber portion 32 is suppressed. However, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the first rubber portion 31 and the second rubber portion 32.

That is, since the first outer cylinder part 21 (and the second outer cylinder part 22) is held and fixed to the cylindrical member 40 (see FIG. 1), the shape as an attachment site to the mating member (in this reference example) The cylindrical member 40 can bear the outer shape that can be press-fitted into the press-fitting hole of the lower arm, and the first outer cylinder portion 21 does not need to take into account the shape as an attachment site to the counterpart member. Therefore, the 1st outer cylinder part 21 can be shape | molded by a press work from the raw material with fixed board thickness, As a result, even if it does not provide a ditch | groove, the 1st outer cylinder part 21 (and 2nd outer cylinder) Part 22) can be drawn.

  The first outer cylinder portion 21 includes an annular portion 20a formed in an annular plate shape orthogonal to the axis O, a curved portion 20b that is connected to the inner edge of the annular portion 20a and whose cross-sectional shape is curved in an arc shape, A conical cylindrical enlarged portion 20c that is connected to the end of the curved portion 20b (lower side in FIG. 3 (b)) and is spaced apart from the curved portion 20b so that the inner diameter is gradually enlarged, and the largest diameter side of the enlarged portion 20c And a cylindrical portion 20d having a substantially constant inner diameter, and these portions 20a to 20d are integrally formed coaxially along the axis O.

  The enlarged diameter portion 20c and the cylindrical portion 20d are smoothly connected in a circular arc shape in cross section. Further, when the annular portion 20a is formed in an annular plate shape orthogonal to the axis O, and the end portion in the axis O direction of the cylindrical member 40 is bent radially inward in a bending step (see FIG. 8) described later. The bent portion overlaps the annular portion 20a in the direction of the axis O (see FIG. 1). Therefore, the engagement between the bent portion of the tubular member 40 and the annular portion 20a can be strengthened.

  Here, the inner peripheral surfaces of the enlarged diameter portion 20c and the cylindrical portion 20d are defined as the concave inner peripheral surface IS. The concave inner peripheral surface IS is a portion surrounding the bulging portion 12 of the inner cylinder member 10, and the enlarged diameter portion 20c and the cylindrical portion 20d are drawn (drawn and deformed) in the outer cylinder drawing step (see FIG. 6). Thus, the shape of the concave inner peripheral surface IS is formed into a concave spherical surface concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10 (see FIG. 1).

In this reference example , as shown in FIG. 3, the outer diameter of the annular portion 20a (diameter at the outer edge of the annular portion 20a) D1 is greater than the outer diameter of the cylindrical portion 20d (diameter on the outer peripheral surface of the cylindrical portion 20d) D2. Is also reduced (D1 <D2). Thereby, in the outer cylinder drawing step (see FIG. 6), only the portion of the cylindrical portion 20d can be brought into contact with a die piece (not shown) and can be pressed (moved) radially inward by the die piece. Therefore, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  The cylindrical member 40 will be described with reference to FIG. 4A is a top view of the tubular member 40, and FIG. 4B is a cross-sectional view of the tubular member 40 taken along line IVb-IVb of FIG. 4A. 4 shows a state before the cylindrical member drawing step (see FIG. 7) (that is, the cylindrical member 40 before drawing).

As shown in FIG. 4, the cylindrical member 40 is a member formed in a cylindrical shape having an axis O from a metal material (a steel material in the present reference example ). That is, the cylindrical member 40 is formed in a shape that is rotationally symmetric with the axis O as the axis of symmetry (rotation axis).

The inner diameter of the cylindrical member 40 is the maximum outer diameter of the vulcanized molded body A after the drawing process (see FIG. 6B) in the outer cylinder drawing process described later (the outer peripheral surfaces of the rubber film portions 33 and 34). Larger than the diameter). In this reference example, it is made larger than the maximum outer diameter (outer diameter D2 of the cylindrical portion 20d) of the vulcanized molded body A before drawing. Thereby, in the assembly work of the vibration isolator 100, the work of inserting the vulcanized molded body A into the inner peripheral side of the tubular member 40 along the axis O direction can be efficiently performed (FIG. 7A). reference).

  Further, at the end of the cylindrical member 40 in the axis O direction (the vertical direction in FIG. 4 (b)), a chamfering process is performed on a corner portion on the inner peripheral surface side to form a chamfered surface 40a having a linear cross section. The formation of the chamfered surface 40a can also improve the workability of inserting the vulcanized molded body A along the axis O direction into the inner peripheral side of the cylindrical member 40. Furthermore, by providing the chamfered surface 40a, it is possible to easily bend the end portion in the axial O direction of the tubular member 40 radially inward in a bending step (see FIG. 8) described later.

  Next, a method for manufacturing the vibration isolator 100 will be described with reference to FIGS. First, with reference to FIG. 5, the manufacturing method of the vulcanization molded object A is demonstrated, and the structure of the rubber base | substrate 30 is demonstrated collectively. 5A is a top view of the vulcanized molded body A, and FIG. 5B is a cross-sectional view of the vulcanized molded body A taken along the line Vb-Vb in FIG. 5A.

  As shown in FIG. 5, the vulcanized molded body A is a part molded by a vulcanization mold and constitutes one element of the vibration isolator 100. That is, the vibration isolator 100 is configured by mounting the tubular member 40 on the vulcanized molded body A. The vulcanized molded body A is manufactured by placing the inner cylinder member 10 and the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) in a vulcanization mold, and after clamping the mold, a rubber material And the rubber substrate 30 is vulcanized and molded. Thereby, the outer peripheral surface of the inner cylindrical member 10 and the inner peripheral surface of the outer cylindrical member 20 (the first outer cylindrical portion 21 and the second outer cylindrical portion 22) are connected by the rubber base 30, and the vulcanized molded body A Is manufactured.

  In addition, the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 are coaxially installed in a vulcanization metal mold | die with the attitude | position which mutually faced the cylindrical parts 20d. The vulcanization mold includes an intermediate mold located in the center of the inner cylinder member 10 in the direction of the axis O (the vertical direction in FIG. 5 (b)). The intermediate mold has an annular shape after clamping, The inner peripheral front end edge of the middle mold is in close contact with the outer peripheral surface of the bulging portion 12 and the top of the spherical surface.

  Thereby, the middle type is interposed between the split surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22, so that the first outer cylinder portion 21 and the second outer cylinder portion 22 have their split surfaces ( The end portion of the cylindrical portion 20d in the axis O direction and the lower side surface of FIG. 3 (b) are placed in the vulcanization mold in a state of being separated in the direction of the axis O, and the rubber base 30 includes the first rubber portion 31 and the second rubber. It is vulcanized and molded into a portion 32 divided into two in the direction of the axis O. That is, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) of the vulcanized molded body A has a split surface of the first outer cylinder portion 21 and a split surface of the second outer cylinder portion 21 in the axis O direction. And a state in which a predetermined interval is provided.

  The first rubber portion 31 is a portion that connects the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the concave inner peripheral surface IS of the first outer cylinder portion 21, and the second rubber portion 32 is the inner cylinder member 10. This is a portion for connecting the outer peripheral surface of the bulging portion 12 and the concave inner peripheral surface IS in the second outer cylindrical portion 22. The first rubber part 31 and the second rubber part 32 are disposed with a predetermined interval between the divided surfaces. The interval between the divided surfaces is formed so as to become narrower from the first outer cylinder portion 21 and the second outer cylinder portion 22 toward the bulging portion 12 of the inner cylinder member 10.

  The first rubber part 31 and the second rubber part 32 do not have to be completely divided (divided) in the axis O direction. For example, even if the first rubber part 31 and the second rubber part 32 are connected by a part (for example, a film-like body) of the rubber base 30 that covers the outer peripheral surface of the bulging part 12 of the inner cylinder member 10. good.

  The rubber base 30 includes rubber film portions 33 and 34 that are covered on the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The rubber film portions 33 and 34 are portions that form a circular outer peripheral surface with the axis O as the center, and are formed in a range from the annular portion 20a to the middle of the conical portion 20c, and the annular portion 20a. Are connected to the first rubber part 31 or the second rubber part 32 via the upper or lower surface (for example, the upper side surface of FIG. 5B in the case of the rubber film 33) and the inner peripheral surface of the curved part 20b.

In this reference example , as shown in FIG. 5, the outer diameter of the rubber film portions 33, 34 (the diameter on the outer peripheral surface of the rubber film portions 33, 34) D3 is equal to the outer diameter of the cylindrical portion 20d (of the cylindrical portion 20d). It is made smaller than the diameter D2 on the outer peripheral surface (D3 <D2).

  Here, the covering range of the rubber film portions 33 and 34 is a range up to the middle of the conical portion 20c, and the rubber film portion 33 and the remaining portion of the conical portion 20c on the cylindrical portion 20d side are disposed on the cylindrical portion 20d. 34 is not covered (that is, the outer peripheral surface is exposed). Thus, in the outer cylinder drawing step (see FIG. 6), the cylindrical portion 20d and the conical portion 20c can be directly pressed by the drawing die (not shown) without using the rubber film portions 33 and 34. The drawing process can be performed with high accuracy.

  The rubber film portions 33 and 34 are provided with receiving recesses 33a and 34a that are recessed from the outer peripheral surface thereof toward the conical portion 20c and are located on the cylindrical portion 20d side. As a result, the contact area between the vulcanization mold and the conical portion 20c can be secured and the sealing performance at the time of vulcanization molding can be improved, so that the rubber film portions 33 and 34 are formed on the outer peripheral surface of the cylindrical portion 20d. Can be suppressed. In addition, by providing the receiving recesses 33a and 34a, a space is formed between the inner peripheral surface of the cylindrical member 40 and the outer peripheral surface of the conical portion 20c in the cylindrical member drawing step (see FIG. 7). In the space, the rubber film portions 33 and 34 that have become surplus can be received.

  An assembly method for assembling the vibration isolator 100 from the vulcanized molded body A and the tubular member 40 will be described with reference to FIGS. The vibration isolator 100 is assembled by an outer cylinder drawing step (see FIG. 6) for drawing the outer cylinder member 20 (first outer cylinder portion 21 and second outer cylinder portion 22), and a rubber base 30 (first rubber portion). 31 and the second rubber portion 32) in the direction of the axis O, a rubber base compression step (see FIG. 7), a cylindrical member drawing step for drawing the cylindrical member 40 (see FIG. 7), and a cylindrical member This is performed by sequentially performing a bending step (see FIG. 8) for bending the end portions of the 40 axis O directions.

  The outer cylinder drawing process will be described with reference to FIG. FIG. 6A is a cross-sectional view of the vulcanized molded body A in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 6B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding A in the state.

  The drawing die for drawing the outer cylinder member 20 (the first outer cylinder portion 21 and the second outer cylinder portion 22) is an annular die and an annular shape that holds and guides the annular die from the outer peripheral side. (All are not shown). The die is divided into a plurality of die pieces in the circumferential direction, and a tapered surface is formed on the outer peripheral surface. The holder has a tapered surface corresponding to the tapered surface of the die formed on the inner periphery.

  In the outer cylinder drawing step, the die is held by a holder installed on the table of the press device, the vulcanized molded body A is set on the inner peripheral side of the die, and then the die is pressed against the holder by the pressing force of the press device. To move relative. By such relative movement, each die piece is guided radially by the taper surface of the inner peripheral surface of the holder to the axial center O of the vulcanized molded body A toward the axis O. Are moved closer to each other and the diameter of the die is reduced.

  Thereby, as shown in FIG.6 (b), the outer peripheral surface of the cylindrical part 20d of the 1st outer cylinder part 21 and the 2nd outer cylinder part 22 presses radially inward by the inner peripheral surface of each die piece. Then, the first outer cylinder part 21 and the second outer cylinder part 22 are drawn.

  By this outer cylinder drawing process, the cylindrical part 20d of the first outer cylinder part 21 and the second outer cylinder part 22 is reduced in diameter from the outer diameter D2 to the outer diameter D4 (D4 <D2). Thereby, preliminary compression in the radial direction (direction perpendicular to the axis O) can be applied to the rubber base 30 (the first rubber portion 31 and the second rubber portion 32).

  Further, as the diameter of the cylindrical portion 20d is reduced, the conical portion 20c and the cylindrical portion 20d are drawn and deformed so as to be bent radially inward with the curved portion 20b as a fulcrum. Is curved. As a result, the shape of the concave inner peripheral surface IS can be brought close to a concave spherical surface that is concentric with the convex spherical surface of the bulging portion 12 of the inner cylinder member 10.

In this reference example , the outer diameter D2 is 53.6 mm, and the outer diameter D4 is 52.0 mm. Further, the outer diameter D4 is made smaller than the outer diameter D3 (see FIG. 5) of the rubber film portions 33 and 34 (D4 <D3). That is, in the vulcanized molded body A shown in FIG. 6B after the outer cylinder drawing process is performed, the rubber film portions 33 and 34 have a larger diameter than the cylindrical portion 20d, and the rubber film portions 33 and 34 are formed. The outer peripheral surface is disposed radially outward (a position spaced apart from the axis O) from the outer peripheral surface of the cylindrical portion 20d.

  With reference to FIG. 7, a rubber base | substrate compression process and a cylindrical member squeezing process are demonstrated. FIG. 7A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state where the rubber base 30 is compressed in the axis O direction in the rubber base compression step, and FIG. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after the drawing process was given to the cylindrical member 40 in the member drawing process.

  As shown in FIG. 7A, in the rubber base compression process, first, the vulcanized molded body A is inserted into the cylindrical member 40 along the direction of the axis O, and the vulcanized molded body A is inserted into the cylindrical member 40. Install on the circumference side. Subsequently, the first outer cylinder portion 21 and the second outer cylinder portion 22 of the vulcanized molded body A are divided into the split surfaces of both the outer cylinder portions 21 and 22 (the end surface in the axis O direction of the cylindrical portion 20d, FIG. 3B lower). Side surface) Relatively move in the direction of axis O so that they are close to each other.

Specifically, the annular part 20a of the first outer cylinder part 21 and the annular part 20a of the second outer cylinder part 22 are sandwiched between the end surfaces of the pair of cylindrical jigs J, and the upper jig J is placed on the lower side. Push down toward the jig J by a predetermined amount in the direction of the axis O. In this reference example , as shown in FIG. 7A, at a position where a predetermined gap is formed between the divided surface of the first outer cylinder portion 21 and the divided surface of the second outer cylinder portion 22. A pair of jigs J is fixed.

  As shown in FIG. 7B, the drawing of the tubular member 40 by the tubular member drawing step is performed with the pair of jigs J fixed (that is, the rubber base 30 (the first rubber portion 31 and the second rubber member 30). The rubber part 32) is carried out while maintaining the state compressed in the direction of the axis O). The configuration of the drawing die for drawing the cylindrical member 40 and the operation thereof are the same as those of the drawing die used in the outer cylinder drawing step, and the description thereof will be omitted.

Here, the drawing of the cylindrical member 40 is performed by pressing the cylindrical portion 20d of the first outer cylindrical portion 21 and the second outer cylindrical portion 22 inward in the radial direction by the inner peripheral surface of the cylindrical member 40. The first outer cylinder part 21 and the second outer cylinder part 22 are placed in the cylindrical member 40 by giving a predetermined fastening allowance (in this reference example , about 0.01 mm to 0.02 mm in radius) to the part 20d. The purpose is to hold. In this way, the tightening margin is set to a small value, and drawing can be performed by the operation of the drawing die with a relatively low pressure, so that the press device can be downsized. In this case, as will be described later, the inner peripheral surface of the tubular member 40 and the rubber film portions 33 and 34 are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 33 and 34.

  The bending process will be described with reference to FIG. FIG. 8A is a cross-sectional view of the vulcanized molded body A and the cylindrical member 40 in a state before the bending process is performed in the bending process, and FIG. 8B is a diagram illustrating the bending process performed in the bending process. It is sectional drawing of the vulcanization molded object A and the cylindrical member 40 in the state after being done.

  The caulking die for bending the end of the cylindrical member 40 in the axis O direction includes a pair of annular dies and a holder that holds the pair of dies so as to be movable in the axis O direction. On the opposing surfaces of the pair of dies, a curved concave portion, which is a concave portion in which a cross-sectional shape cut along a plane including the axis O curves in a circular arc shape, is recessed at a portion where the end portion in the axial O direction of the cylindrical member 40 abuts. Established.

  In the bending process, after the vulcanized molded body A and the cylindrical member 40 in the state shown in FIG. 8A are set between a pair of dies of a caulking die installed on a table of the press apparatus, The pair of dies are moved relative to each other in the direction approaching each other by the applied pressure. With this relative movement, the end portion in the axis O direction of the tubular member 40 is deformed along the inner surface shape of the curved concave portion of the die and bent toward the radially inward side. As a result, as shown in FIG. 8B, the tubular member 40 is attached to the vulcanized molded body A, and the assembly thereof (manufacture of the vibration isolator 100) is completed.

  Here, the cylindrical member 40 has been subjected to the drawing process in the cylindrical member drawing step described above (see FIG. 7), so that the pair of jigs J are removed as shown in FIG. Even in this state, the first outer cylinder part 21 and the second outer cylinder part 22 can be held on the inner peripheral side.

  In this case, when the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22 and the inner peripheral surface of the cylindrical member 40 are in direct contact (that is, the metal materials are in contact with each other), It is difficult to ensure the coefficient of friction. Further, since the spring back after the drawing process is enlarged by the cylindrical member 40 located on the outer peripheral side, it is difficult to secure the tightening allowance. Therefore, the first outer cylinder portion 21 and the second outer cylinder portion 22 may come out from the cylindrical member 40 in the axis O direction.

On the other hand, in the present reference example , rubber film portions 33 and 34 made of a rubber-like elastic body are covered on part of the outer peripheral surfaces of the first outer cylinder portion 21 and the second outer cylinder portion 22. The friction coefficient can be ensured by the intervention of the rubber film portion. Further, the rubber film portions 33 and 34 are interposed, so that the shortage of the tightening allowance due to the spring back of the tubular member 40 can be compensated by the compression force due to the elastic recovery of the rubber film portions 33 and 34. Therefore, it is possible to secure a holding force against the withdrawal in the axis O direction, and to prevent the first outer cylinder portion 21 and the second outer cylinder portion 22 from coming out of the cylindrical member 40 in the axis O direction. Thereby, the caulking die used in the bending process does not need to consider the relationship with the jig J (that is, the bending process can be performed with the jig J removed). It can be simplified.

  In addition, even if the first outer cylinder portion 21 and the second outer cylinder portion 22 are slightly shifted in the direction of the axis O (moved in the direction of withdrawal) by removing the pair of jigs J, When bending the axial O-direction end of the cylindrical member 40 in the bending step, the bent portions are used to push back the first outer cylindrical portion 21 and the second outer cylindrical portion 22 to define the position in the axial O direction. (Can be placed at an appropriate position).

  In addition, the cylindrical member 40 is subjected to drawing processing, and the inner peripheral surface thereof is in close contact with the first outer cylinder portion 21 and the second outer cylinder portion 22 and the rubber film portions 33 and 34, thereby preventing vibration. When the apparatus 100 is used, the vulcanized molded body A can be prevented from rattling in the radial direction (perpendicular to the axis O) on the inner peripheral side of the tubular member 40.

  As described above, according to the vibration isolator 100, the rubber base 30 (the first rubber portion 31 and the second rubber portion 32) includes the outer peripheral surface of the bulging portion 12 of the inner cylinder member 10 and the outer cylinder member 20 ( Since the connection is made between the concave inner peripheral surface IS of the first outer cylinder portion 21 and the second outer cylinder portion 22) (that is, the concentric concave spherical surface surrounding the bulging portion 12 of the inner cylinder member 10). In response to the input of the directional displacement, the rubber base 30 can be deformed mainly in the shearing direction. Therefore, the spring constant in the twisting direction of the vibration isolator 100 can be reduced.

  In this case, in the vulcanized molded body A, the division surface of the first outer cylinder portion 21 and the division surface of the second outer cylinder portion 22 are separated in the axis O direction by a vulcanization process (with a predetermined interval). ), The first rubber portion 31 and the second rubber portion 32 are vulcanized (see FIG. 6A). The vulcanized molded body A vulcanized and molded in such a form has a rubber base compression step (see FIGS. 6B and 7A) and a cylindrical member squeezing step (FIGS. 7A and 7). (B)) and the bending process (see FIGS. 8A and 8B), the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the axis O direction and divided. It is held and fixed by the cylindrical member 40 in a state where the surfaces are close to each other. Thereby, preliminary compression in the direction of the axis O can be applied to the first rubber part 31 and the second rubber part 32.

  Note that such provision of pre-compression in the direction of the axis O is impossible with a structure that uses the reduced diameter of the outer cylinder member that accompanies drawing as in the conventional product, and is similar to that of the vibration isolator 100. In addition, the first outer cylinder part 21 and the second outer cylinder part 22 that are relatively moved in the direction of the axis O can be provided only by adopting a structure in which the cylindrical member 40 holds and fixes the first outer cylinder part 21 and the second outer cylinder part 22. Thereby, the spring constant in the direction of the axis O can be increased, and the durability against the displacement in the direction of the axis O can be improved.

  Further, according to the vibration isolator 100, as described above, the vulcanized molded body A has the divided surface of the first outer cylinder part 21 and the divided surface of the second outer cylinder part 22 separated in the axis O direction. Vulcanization molding is performed in a state (with a predetermined interval) (see FIG. 6A), and after the vulcanization molding, the first outer cylinder portion 21 and the second outer cylinder portion 22 are relatively moved in the direction of the axis O. (Refer to FIG. 6B and FIG. 7A) Since it is configured to be held and fixed by the cylindrical member 40 (see FIG. 8B), it is between the first outer cylinder portion 21 and the second outer cylinder portion 22. The relative distance in the axis O direction (that is, the separation distance in the axis O direction between the split surfaces when held and fixed to the cylindrical member 40 (the vertical distance in FIG. 8B)) can be adjusted. Thereby, since the amount of preliminary compression in the direction of the axis O applied to the first rubber part 31 and the second rubber part 32 can be adjusted, the value of the spring constant in the direction of the axis O can be increased or decreased.

  In this case, it is necessary to adjust the amount of bending deformation of the end portion in the axis O direction of the cylindrical member 40, and the shape of the curved concave portion of the caulking die used in the bending step (see FIG. 8) is adjusted. . When the amount of bending deformation (shape of the curved concave portion) is insufficient, the dimension of the tubular member 40 in the axis O direction is changed.

Next, the vibration isolator 200 in the second reference example will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as the 1st reference example mentioned above, and the description is abbreviate | omitted. FIG. 9A is a cross-sectional view of the vulcanized molded body B constituting the vibration isolator 200 in the second reference example , and FIG. 9B is a cross-sectional view of the vibration isolator 200 in the second reference example . is there. 9A shows the vulcanized molded body B in a state before the outer cylinder member 20 is drawn by the outer cylinder drawing step.

The vulcanized molded body B in the second reference example has the other configurations except that the configuration (formation range) of the rubber film portions 233 and 234 is different from the configuration of the rubber film portions 33 and 34 in the first reference example . It is the same as the vulcanized molded product A in 1 Reference Example . The method for manufacturing the vibration isolator 200 is the same as that for the vibration isolator 100. Therefore, these descriptions are omitted.

As shown in FIG. 9A, the rubber film parts 233 and 234 in the second reference example are covered over the entire outer peripheral surfaces of the first outer cylinder part 21 and the second outer cylinder part 22. That is, the covering range of the rubber film portions 33 and 34 in the first reference example is a range extending from the annular portion 20a to the middle of the conical portion 20c (see FIG. 5B), but this covering range. The rubber film portions 233 and 234 are also covered on the outer peripheral surface of the conical portion 20c and the outer peripheral surface of the cylindrical portion 20d.

The rubber film portions 233 and 234 form a circular outer peripheral surface with the axis O as the center, as in the case of the first reference example . The outer diameters of these rubber film parts 233 and 234 (the diameters on the outer peripheral surfaces of the rubber film parts 233 and 234) are made smaller than the inner diameter of the tubular member 40.

According to the vibration isolator 200 in the second reference example , the contact area with the inner peripheral surface of the tubular member 40 can be increased by expanding the covering range of the rubber film portions 233 and 234. Accordingly, the holding force of the vulcanized molded body B by the cylindrical member 40 can be secured, and therefore, after the cylindrical member 40 is drawn by the cylindrical member drawing process, the process proceeds to the bending process (see FIG. 8), it is possible to more reliably suppress the vulcanized molded body B from coming out in the direction of the axis O from the inner peripheral side of the tubular member 40.

Next, the vibration isolator 300 in the third reference example will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as each reference example mentioned above, and the description is abbreviate | omitted. FIG. 10A is a cross-sectional view of the vulcanized molded body C constituting the vibration isolator 300 in the third reference example , and FIG. 10B is a cross-sectional view of the vibration isolator 300 in the third reference example . is there.

In the vulcanized molded body C in the third reference example , the configurations of the first outer cylinder portion 321 and the second outer cylinder portion 322 are the same as the configurations of the first outer cylinder portion 21 and the second outer cylinder portion 22 in the first reference example . Except for the differences, the other configurations are the same as those of the vulcanized molded body A in the first reference example . However, the rubber film portions 233 and 234 are the same as the vulcanized molded body B in the second reference example . The manufacturing method of the vibration isolator 300 is the same as that of the vibration isolator 100 except that the outer cylinder drawing step (see FIG. 6, drawing of the outer cylinder member 320) is omitted. . Therefore, these descriptions are omitted.

As shown in FIG. 10 (a), the outer cylinder member 320 in the third reference example is a solid member formed by casting (in this reference example , a member made of aluminum die casting), and has a concave shape on the inner peripheral side. A concave inner peripheral surface IS formed as a spherical surface is provided, and is divided into a first outer cylinder portion 321 and a second outer cylinder portion 322 at a central portion in the axis O direction of the concave inner peripheral surface IS. The first outer cylinder part 321 and the second outer cylinder part 322 are the same member (configuration).

In the vulcanized molded body C, as in the case of the vulcanized molded body A in the first reference example , the divided surface of the first outer cylinder part 321 and the divided surface of the second outer cylinder part 322 are separated in the axis O direction. Vulcanization is performed at a predetermined interval. The concave inner circumferential surface IS is formed so that the first outer cylinder part 321 and the second outer cylinder part 322 are close to each other in the divided surfaces of the outer cylinder parts 321 and 322 in the rubber base compression process (see FIG. 7). Further, by being relatively moved in the direction of the axis O, a convex spherical surface is formed concentrically with the convex spherical surface in the bulging portion 12 of the inner cylinder member 10.

  According to the vibration isolator 300, the rubber base 30 (the first rubber part 31 and the second rubber part 32) can be mainly deformed in the shearing direction in response to the input of the displacement in the twisting direction. The spring constant at can be reduced.

  Further, since the first outer cylinder part 321 and the second outer cylinder part 322 are relatively moved in the direction of the axis O and the divided surfaces are brought close to each other, the first outer cylinder part 321 and the second outer cylinder part 322 are held and fixed by the cylindrical member 40. Preliminary compression in the direction of the axis O can be applied to the part 31 and the second rubber part 32.

  That is, even if the outer cylinder member 320 (the first outer cylinder portion 321 and the second outer cylinder portion 322) has a shape that cannot be subjected to drawing processing (diameter reduction processing), the first rubber portion 31 and the second rubber portion 31 are provided. By preliminarily compressing the rubber part 32 in the axis O direction, the spring constant in the axis O direction can be increased, and durability against displacement in the axis O direction can be improved.

Next, a vibration isolator 400 in the fourth reference example will be described with reference to FIGS. FIG. 11A is a top view of the vibration isolator 400 in the fourth reference example , and FIG. 11B is a cross-sectional view of the vibration isolator 400 taken along the line XIb-XIb in FIG. In addition, the same code | symbol is attached | subjected to the part same as each reference example mentioned above, and the description is abbreviate | omitted.

  As shown in FIG. 11, the inner cylinder member 410 is a member formed in a rotationally symmetric shape having an axis O as a symmetric axis (rotation center), and a cylindrical shape in which an insertion hole is formed through the axis O. A shaft portion 411 and a spherical bulging portion 412 that bulges radially outward from the outer peripheral surface of the shaft portion 411 are formed integrally from a metal material. The bulging portion 412 is disposed in the center of the shaft portion 411 in the axis O direction (the center in the vertical direction in FIG. 11B), and the center of the convex spherical surface of the bulging portion 412 is on the axis O of the shaft portion 411. To position.

  The outer cylinder member 420 is divided into a first outer cylinder part 421 and a second outer cylinder part 422 at the center in the axis O direction. Here, with reference to FIG. 12, the detailed structure of the outer cylinder member 420 is demonstrated. In addition, since the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 are the same members (structure), and are only members from which a name differs, the 1st outer cylinder part 421 is demonstrated below, The description of the second outer cylinder portion 422 is omitted.

  12A is a top view of the first outer cylinder portion 421, and FIG. 12B is a cross-sectional view of the first outer cylinder portion 421 taken along the line XIIb-XIIb of FIG. 12A. FIG. 12 shows a state before drawing (see FIG. 15) in the outer cylinder drawing process.

As shown in FIG. 12, the first outer cylinder portion 421 is a member obtained by forming a plate-shaped metal material (steel material in the present reference example ) having a constant thickness into a vessel shape by pressing. It is formed in rotational symmetry with O as the axis of symmetry (rotation center). In addition, the point which does not need to form the ditch | groove for enabling a drawing process like the conventional product with respect to the 1st outer cylinder part 421, and the effect are the 1st outer cylinder part 21 in a 1st reference example , and the effect. Since it is the same, the description is abbreviate | omitted.

  The first outer cylinder portion 421 is located on one end side in the axis O direction (upper side in FIG. 12B), and has a cylindrical portion having a substantially constant diameter (inner diameter and outer diameter), and the cylindrical portion. And the diameter is gradually enlarged toward the dividing surface (lower end surface in FIG. 12 (b)) and the cross-sectional shape is curved in an arc shape.

  The first outer cylinder portion 421 has an inner diameter dimension of the cylindrical portion (that is, an opening at the end of the first outer cylinder portion 421 in the direction of the axis O in the state before being drawn by an outer cylinder drawing step described later). The minimum inner diameter dimension in FIG. 12B (upper side) is made smaller than the maximum outer diameter dimension in the bulging portion 412 of the inner cylinder member 410 (see FIG. 13B).

A plurality of (four in this reference example ) through-holes 421a are formed at equal intervals in the circumferential direction at a portion where the cross-sectional shape is curved in an arc shape. Further, the inner peripheral surface of the portion curved in an arc shape is a concave inner peripheral surface IS surrounding the bulging portion 412 of the inner cylinder member 410. The concave inner circumferential surface IS is brought closer to the concave spherical surface concentric with the convex spherical surface in the bulging portion 412 of the inner cylindrical member 410 by performing drawing in the outer cylindrical drawing step (see FIG. 14). It is done.

Returning to FIG. The cylindrical member 440 has the same configuration as that of the cylindrical member 40 in the first reference example except that the chamfered surface 40a is not formed (see FIGS. 4 and 16A). Omitted. In addition, in FIG. 11, the cylindrical member 440 after drawing by the cylindrical member drawing process (refer FIG. 16) is illustrated.

  An interposed member 450 is interposed between the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422. The interposed member 450 is a member for restricting the first outer cylinder part 421 and the second outer cylinder part 422 from moving in the direction in which the divided surfaces are brought close to each other in the cylindrical member 440. Here, with reference to FIG. 13, the detailed structure of the interposed member 450 is demonstrated.

  13A is a top view of the interposed member 450, and FIG. 13B is a cross-sectional view of the interposed member 450 taken along line XIIIb-XIIIb in FIG. In FIG. 13, for easy understanding, a state where the two divided members (interposition members 450) are separated from each other is illustrated.

As shown in FIG. 13, the interposition member 450 is a member formed in a cylindrical shape from a metal material (steel material in the present reference example ), and has two locations (upper side in FIG. 13A) whose phases are different by 180 degrees. And divided into two parts into two parts. Therefore, since the two members constituting the interposed member 450 have the same shape (configuration), the types of components can be reduced accordingly.

  The plate thickness dimension of the interposed member 450 is set to the same plate thickness dimension as the outer cylinder member 420 (the first outer cylinder portion 421 and the second outer cylinder portion 422), and two members constituting the interposed member 450 The diameter (inner diameter and outer diameter) of the cylinder obtained by bringing the divided surfaces into contact with each other is the diameter (the lower side surface in FIG. 12 (b)) of the first outer cylinder portion 421 and the second outer cylinder portion 422. The inner diameter and the outer diameter). Therefore, in the assembled state of the vibration isolator 400, the end surface of the interposed member 450 faces the split surface of the first outer cylinder portion 421 and the second outer cylinder portion 422, and is described later on the inner peripheral surface side of the interposed member 450. A space SP is secured (see FIG. 11B).

  Next, a method for manufacturing the vibration isolator 400 will be described with reference to FIGS. First, with reference to FIG. 14, the manufacturing method of the vulcanization molded object D is demonstrated, and the structure of the rubber base | substrate 430 is also demonstrated. FIG. 14A is a side view of the vulcanized molded body D, and FIG. 14B is a cross-sectional view of the vulcanized molded body D along the line XIVb-XIVb in FIG. 14A.

As shown in FIG. 14, the vulcanized molded body D includes an inner cylinder member 410 and an outer cylinder member 420 (first outer cylinder part 421 and second outer cylinder part 422), as in the case of the first reference example. The rubber base 430 (the first rubber part 431 and the second rubber part 432) is vulcanized and molded while being installed in the vulcanization mold, and the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 420 (first outer cylinder part). 421 and the inner peripheral surface of the second outer cylindrical portion 422) are connected by a rubber base 430, and thus the manufacturing is performed.

  In this case, the vulcanization mold is provided with an intermediate mold that is located in the center of the inner cylinder member 410 in the direction of the axis O (the vertical direction in FIG. 14 (b)) and has an annular shape after the mold clamping. The inner peripheral front end edge of the middle mold faces the outer circumferential surface (top) of the bulging portion 412 with a predetermined interval, and the upper and lower surfaces of the middle mold are the first outer cylinder portion 421 and the second outer cylinder portion 422. Support the split surface. In addition, the support part (not shown) by the middle mold | type of this division surface is intermittently arrange | positioned in the circumferential direction.

Due to the intermediate mold, the first outer cylinder part 421 and the second outer cylinder part 422 are installed in the vulcanization mold with their divided surfaces spaced apart in the direction of the axis O, and the rubber base 430 is the first rubber. The part 431 and the second rubber part 432 are vulcanized and molded into two parts in the direction of the axis O. That is, the vulcanized molded body D has a space between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432 (and the dividing surface of the first outer cylinder portion 421 and the division of the second outer cylinder portion 422). A space SP having a shape corresponding to the middle size (in the reference example , a U-shaped cross section) is formed between the surface and the surface.

  The first rubber portion 431 is a portion that connects the outer peripheral surface of the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the first outer cylindrical portion 421, and the second rubber portion 432 is the inner cylindrical member 410. The outer peripheral surface of the bulging portion 412 and the concave inner peripheral surface IS in the second outer cylinder portion 422 are connected to each other.

  The rubber base 430 includes rubber film portions 431 a and 431 b that are covered on the outer peripheral surface of the first outer cylinder portion 421. The rubber film portions 431a and 431b are two belt-like films that are continuous in the circumferential direction. The rubber film portion 431a is passed through the through hole 421a of the first outer cylinder portion 421, and the rubber film portion 431b is the first outer cylinder. The first rubber portions 431 are connected to each other through the dividing surface of the portion 421.

In this reference example , since the rubber film portion 431b employs a configuration that is continuous with the first rubber portion 431 via the dividing surface of the first outer cylinder portion 421, in addition to the through hole 421a, the rubber film portion There is no need to form a through hole in the first outer cylinder portion 421 for connecting the 431b to the first rubber portion 431. Therefore, since formation of a through-hole can be suppressed to the minimum, the rigidity of the 1st outer cylinder part 421 can be ensured by that much, and the durable improvement can be aimed at.

  Here, the covering range of the rubber film portions 431a and 431b is partial, and there is a rubber film portion in the region above the rubber film portion 431a (upper side in FIG. 13B) and between the rubber film portions 431a and 431b. 431a and 431b are not covered (that is, the outer peripheral surface of the first outer cylinder portion 421 is exposed). Thereby, in the outer cylinder drawing step (see FIG. 14), the outer peripheral surface of the first outer cylinder part 421 can be directly pressed by a drawing die (not shown) without using the rubber film parts 431a and 431b. Drawing can be performed with high accuracy.

  The rubber base 430 includes rubber film portions 432 a and 432 b that are provided on the outer peripheral surface of the second outer cylinder portion 422. The rubber film portions 432a and 432b are configured in the same manner as the rubber film portions 431a and 431b, respectively, and thus description thereof is omitted.

With reference to FIG.15 and FIG.16, the assembly method which assembles the vibration isolator 400 from the vulcanization molded object D and the cylindrical member 440 is demonstrated. In the first reference example (vibration isolator 100), the rubber base 30 (the first rubber part 31 and the second rubber part 32) is compressed in the axis O direction by the rubber base compression step (see FIG. 7). In the reference example (anti-vibration device 400), the rubber substrate compression step is omitted.

  FIG. 15A is a cross-sectional view of the vulcanized molded body D in a state before the drawing process is performed in the outer cylinder drawing process, and FIG. 15B is a diagram after the drawing process is performed in the outer cylinder drawing process. It is sectional drawing of the vulcanization molding D in the state.

As shown in FIG. 15, in the vulcanized molded body D, in the outer cylinder drawing step, the first outer cylinder part 421 and the second outer cylinder part 422 are reduced in diameter from the outer diameter D401 to the outer diameter D402 (D402 < D401). Thereby, preliminary compression in the radial direction (perpendicular to the axis O) can be applied to the rubber base 430 (the first rubber part 431 and the second rubber part 432). The configuration and operation of the drawing die are the same as in the case of the first reference example , and the description thereof is omitted.

  The vulcanized molded body D is vulcanized and molded so that the interposed member 450 can be disposed in the space SP (between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422). (See FIG. 16 (a)).

  FIG. 16A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 440 in a state before the cylindrical member 440 is subjected to the drawing process in the cylindrical member drawing process, and FIG. FIG. 5 is a cross-sectional view of the vibration isolator 400 in a state after the cylindrical member 440 has been subjected to drawing processing in the cylindrical member drawing step.

As shown in FIG. 16, in the fourth reference example , since the rubber base compression step is omitted, the vulcanized molded body D is inserted into the cylindrical member 440 along the axis O direction, and the vulcanized molded body D is After installation on the inner peripheral side of the cylindrical member 440 (FIG. 16A), the cylindrical member 440 is drawn in the cylindrical member drawing step (FIG. 16B).

  As shown in FIG. 16 (a), the vulcanized molded body D is inserted into the cylindrical member 440. The space SP (the split surface of the first outer cylindrical portion 421 and the second outer cylindrical portion 422) is inserted into the vulcanized molded body D. This is performed in a state in which the interposition member 450 is mounted between the divided surfaces of the two. In this case, since the two members constituting the interposed member 450 have the same shape as each other, it is not necessary to consider the directionality, and the mounting workability can be improved.

  In this way, the interposed member 450 is formed as a separate member from the first outer cylinder portion 421 and the second outer cylinder portion 422. Therefore, the vulcanized molded body D in which the first outer cylinder part 421 and the second outer cylinder part 422 and the inner cylinder member 410 are connected by the first rubber part 431 and the second rubber part 432 is added by the vulcanization mold. After the vulcanization molding, the interposed member 450 may be attached to the vulcanization molding D. That is, in the structure of the vulcanization mold (for example, the middle mold splitting structure) of the portion that forms the space SP between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432, the interposed member 450. Therefore, the structure of the vulcanization mold can be simplified.

  In the cylindrical member drawing step, two-stage drawing is performed on the cylindrical member 440. That is, the entire cylindrical member 440 is reduced from the outer diameter D403 to the outer diameter D404 by the first stage drawing (D404 <D403). Next, by the second stage drawing process, the cylindrical member 440 has the first outer cylinder portion 421 and the second outer cylinder at the one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction. The diameter of the portion 422 is reduced to a shape close to the outer peripheral surface of the concave inner peripheral surface IS of the concave inner peripheral surface IS (that is, a portion where the cross-sectional shape is curved in an arc) (inward in the radial direction in a cross-sectional view). Bend). As a result, the tubular member 440 is mounted on the vulcanized molded body D, and the assembly thereof (manufacture of the vibration isolator 400) is completed.

  In the vibration isolator 400 that has been assembled, as shown in FIG. 16B, in the second stage of drawing, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are radially inward. Along with the deformation, the upper and lower end surfaces (in the direction of the axis O) of the interposed member 450 are clamped and held from above and below by the divided surface of the first outer cylinder portion 421 and the divided surface of the second outer cylinder portion 422. .

  The first stage drawing and the second stage drawing may be performed by different drawing dies, or may be performed by the same drawing dies. When the same drawing mold is used, the first stage drawing and the second stage drawing may proceed simultaneously.

In the cylindrical member squeezing step, the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed radially inward by the inner peripheral surface of the cylindrical member 440, and the first outer cylindrical portion 421 and the second outer cylindrical portion 422 are pressed. A predetermined fastening allowance (in the present reference example , about 0.01 mm to 0.02 mm in radius) is applied to the cylindrical portion 422. Thereby, the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 can be firmly hold | maintained in the cylindrical member 440. FIG. In this case, the inner peripheral surface of the tubular member 440 and the rubber film portions 431a to 432b are brought into close contact with each other by the elastic recovery force of the compressed rubber film portions 431a to 432b.

As shown in FIG. 16A, the inner diameter of the cylindrical member 440 is the outer cylinder member 420 (first outer cylinder) after the drawing process (see FIG. 15B) by the outer cylinder drawing process. Part 421 and second outer cylinder part 422) are made larger than the outer diameter D402. In this reference example , the inner diameter of the tubular member 440 is made larger than the maximum outer diameter of the vulcanized molded body D (the outer diameter on the outer peripheral surface of the rubber film portions 431b and 432b). Thereby, in the assembly work of the vibration isolator 400, the work of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the tubular member 440 can be efficiently performed.

  However, the inner diameter of the cylindrical member 440 is larger than the outer diameter D402 of the outer cylindrical member 420 and smaller than the maximum outer diameter of the vulcanized molded body D (the diameter on the outer peripheral surface of the rubber film portions 431b and 432b). The rubber film portions 431b and 432b may be press-fitted while being elastically deformed. The processing amount of the drawing process applied to the cylindrical member 440 can be suppressed, and the yield can be improved and the processing cost can be reduced.

Further, since the rubber film portions 431a to 432b are covered on the outer peripheral surfaces of the first outer cylinder portion 421 and the second outer cylinder portion 422, the friction coefficient is secured and the cylinder is secured as in the case of the first reference example. The shortage of the tightening allowance due to the spring back of the member 440 can be compensated by the compressive force due to the elastic recovery of the rubber film portions 431a to 432b. Therefore, even if the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422 are separated from each other, a holding force against movement in the axis O direction can be ensured. Thereby, when a large displacement is input in the direction of the axis O, the first outer cylinder portion 421 and the second outer cylinder portion 422 are prevented from moving in the cylindrical member 440 in a direction in which the divided surfaces are brought close to each other. it can.

  As described above, according to the vibration isolator 400, the rubber base compression step is omitted, and the divided surface of the first rubber part 431 and the divided surface of the second rubber part 432 are separated from each other in the axis O direction. The first outer cylinder portion 421 and the second outer cylinder in a state in which the space SP is formed between them (that is, the first rubber portion 431 and the second rubber portion 432 are not preliminarily compressed in the direction of the axis O). The portion 422 is held and fixed by the cylindrical member 440.

  Thus, by forming the space SP between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the first rubber portion 431 and the first rubber portion 431 in the twisting direction corresponding to the space SP. The compression component of the first rubber part 431 and the second rubber part 432 in the axis O direction while suppressing the shear component of the two rubber parts 432 and the compression component of the first rubber part 431 and the second rubber part 432 in the direction perpendicular to the axis O Can be secured. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  On the other hand, in such a structure in which the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432, the space SP is formed by a vulcanization mold (that is, In order to arrange the middle mold), it is necessary to separate the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 in the axis O direction. However, when the dividing surface of the first outer cylinder part 421 and the dividing surface of the second outer cylinder part 422 are separated in the axis O direction, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected. There is a risk of moving in the direction in which the divided surfaces are brought close to each other.

  On the other hand, according to the vibration isolator 400, since the interposed member 450 is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, the first rubber part The first outer cylinder portion 421 and the second outer cylinder portion 422 move in a direction in which the respective division surfaces are brought close to each other while ensuring the space SP between the division surface of 431 and the division surface of the second rubber portion 432. Can be regulated by the interposed member 450.

  Further, the portions on one end side in the axis O direction and the other end side in the axis O direction excluding the central portion in the axis O direction of the cylindrical member 440 are the concave inner peripheral surface IS of the first outer cylinder portion 421 and the second outer cylinder portion 422. The cylindrical member 440 is reduced in diameter so as to be in close contact with the outer peripheral surface (that is, the portion where the cross-sectional shape is curved in an arc shape) (bent inward in the radial direction in the cross-sectional view). On the other hand, the movement of the first outer cylinder portion 421 and the second outer cylinder portion 422 in the direction in which the divided surfaces are separated from each other can also be restricted.

  That is, when the first outer cylinder part 421 and the second outer cylinder part 422 move in the direction in which the divided surfaces are brought close to each other, the movement is restricted by the interposed member 450 and the divided surfaces are separated from each other. In the case of moving in the direction, the movement can be restricted by a portion of the cylindrical member 440 on one end side in the axis O direction or on the other end side in the axis O direction. Thereby, since the movement in these both directions can be controlled without relying on the friction with the inner peripheral surface of the cylindrical member 440, when the large displacement is input in the axis O direction, The second outer cylinder portion 422 can be reliably suppressed from being displaced in the axis O direction with respect to the cylindrical member 440.

  In particular, the interposition member 450 is formed into a cylindrical shape by combining two members constituting the interposition member 450, so that the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422 The range interposed between the two can be almost the entire circumference in the circumferential direction. Therefore, it can be controlled stably that the 1st outer cylinder part 421 and the 2nd outer cylinder part 422 move to the direction which makes a mutual division surface approach.

  Further, according to the vibration isolator 400, the maximum outer diameter dimension (outer diameter at the central portion in the axis O direction) of the bulging portion 412 of the inner cylinder member 410 is the first outer cylinder portion 421 and the second outer cylinder portion 422. Is larger than the minimum inner diameter dimension (inner diameter dimension of the cylindrical portion) at the end opening in the axis O direction, so that the pressure receiving area is increased with respect to the displacement in the axis O direction, and the first rubber section 431 and The compression component of the second rubber part 432 can be ensured. As a result, the effect of increasing the spring constant in the axis O direction can be made remarkable while reducing the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O.

  The relationship between the maximum outer diameter of the bulging portion 412 and the minimum inner diameter of the outer cylindrical member 420 is between the bulging portion 412 of the inner cylindrical member 410 and the concave inner peripheral surface IS of the outer cylindrical member 420. In the conventional product in which the rubber base is continuously disposed (that is, having no space SP), the rubber base shear component in the twisting direction and the direction perpendicular to the base O are simultaneously with the compressive component of the rubber base in the axial O direction. Since the compression component of the rubber base is also increased, it is impossible to employ the compression component, and the space SP is formed between the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 as in the vibration isolator 400. Can be adopted for the first time.

Here, in this reference example , the rubber base compression step (see FIG. 7) is omitted with respect to the first reference example , and the first rubber portion 431 and the second rubber portion 432 are not preliminarily compressed in the axis O direction. In the cylindrical member squeezing step (see FIG. 15), the first rubber part 431 and the second rubber part 440 are deformed along the deformation of the cylindrical member 440 on one end side in the axis O direction and on the other end side in the axis O direction. The rubber part 432 is allowed to be compressed and deformed in the direction of the axis O. That is, it is sufficient that a space SP is secured between the dividing surface of the first rubber part 431 and the dividing surface of the second rubber part 432.

FIG. 17A is a top view of the interposed member 550 in the fifth reference example , and FIG. 17B is a top view of the interposed member 650 in the sixth reference example . With reference to FIGS. 17A and 17B, the interposed members 550 and 650 in the fifth and sixth reference examples will be described.

The height dimension of the interposition members 550 and 650 (the vertical dimension in FIG. 17A and FIG. 17B) is the height dimension of the interposition member 450 in the fourth reference example (FIG. 13B). Vertical dimension). Further, the diameters (inner diameter and outer diameter) of the interposition members 550 and 650 when not deformed are the diameters (the lower side surface in FIG. 12B) of the first outer cylinder part 421 and the second outer cylinder part 422 (the lower side surface). The inner diameter and the outer diameter).

As shown to Fig.17 (a), the interposed member 550 is a member formed in a cylindrical shape from a metal material (in this reference example , a steel material), and only one place in the circumferential direction is divided. Therefore, the diameter of the interposition member 550 is expanded from the parting point as a starting point (the parting part is separated in the circumferential direction in the same plane), or the interposition member 550 is twisted and deformed (the parting part is axially separated). (In FIG. 17A, the direction perpendicular to the paper surface) can be separated from each other), whereby the interposing member 550 can be easily attached to the vulcanized molded body D.

  On the other hand, since the interposition member 550 is restored to its original shape by its own elastic recovery force after mounting, the interposition member 550 is held in the space SP of the vulcanized molded body D without dropping off. Can do. Therefore, the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D into the cylindrical member 440 with the interposed member 550 can be made easy.

  As shown in FIG. 17B, the interposed member 650 is formed with a bent portion 650a at a position opposite to the part to be divided (position where the phase is changed by 180 °). The bent portion 650a is formed to be curved in a C shape when viewed from above, and assists in elastic deformation (deformation that increases the diameter or torsional deformation) of the interposed member 650. Thereby, mounting | wearing of the interposed member 650 to the vulcanization molded object D can be performed easily.

  The bent portion 650 and the vicinity thereof are arranged to be offset radially inward (center side) in the top view shown in FIG. 17B, and are circular shapes formed by the outer peripheral surface of the interposed member 650. The bent portion 650a is formed so as not to protrude outward in the radial direction from the outer shape (schematically illustrated by a two-dot chain line in FIG. 17B). Thereby, in the operation | work (refer FIG. 16 (a)) which inserts the vulcanization molding D with which the interposed member 650 was mounted | worn into the cylindrical member 440 (refer Fig.16 (a)), the bending | flexion part 650a inhibits an operation | work (it catches on the cylindrical member 440). ) Can be avoided and workability can be improved.

  The bent portion 650a may be formed so as to protrude outward in the radial direction from the circular outer shape formed by the outer peripheral surface of the interposed member 650. Further, in FIGS. 17A and 17B, in order to facilitate understanding, the circumferential separation amount (interval) at the portion where the interposition members 550 and 650 are divided is schematically enlarged. The circumferential distance can be arbitrarily set according to the material and the like.

Next, with reference to FIG. 18 and FIG. 19, a vibration isolator 700 in the seventh reference example will be described. In the fourth reference example, by mounting the interposition member 450, the first outer cylinder portion 421 and the second outer tube section 422 has restricted from moving in the direction to close to each other of the split plane, the seventh reference The vibration isolator 700 in the example is configured to restrict the movement without mounting another member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each reference example mentioned above, and the description is abbreviate | omitted.

18A is a top view of the cylindrical member 740 in the seventh reference example , and FIG. 18B is a cross-sectional view of the cylindrical member 740 taken along the line XVIIIb-XVIIIb in FIG. 18A.

The anti-vibration device 700 in the seventh reference example is different from the anti-vibration device 400 in the fourth reference example only in that a restriction bulging portion 740a is formed on the tubular member 740, and the other configuration and assembly method. Are the same. Therefore, only different points will be described below.

In the tubular member 740, a restriction bulging portion 740 a is formed to bulge inward in the radial direction on the inner peripheral surface portion at the center in the axis O direction. The restriction bulging portion 740a is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422, so that the first outer cylinder portion 421 and the second outer cylinder portion 422 are arranged. It is a part for restricting movement, and is formed in a rectangular shape in front view, and a plurality (four in this reference example ) are arranged at equal intervals in the circumferential direction.

  FIG. 19A is a cross-sectional view of the vulcanized molded body D and the cylindrical body 740 in a state before the cylindrical member 740 is drawn in the cylindrical member drawing process, and FIG. FIG. 10 is a partial cross-sectional view of the vibration isolator 700 in a state after the cylindrical member 740 has been subjected to drawing processing in the cylindrical member drawing step. In FIG. 19B, only a part is seen in cross section.

As shown in FIG. 19, the vibration isolator 700 in the seventh reference example is assembled in the same manner as in the case of the vibration isolator 400 in the fourth reference example (see FIG. 16). Is inserted along the direction of the axis O, and the vulcanized molded body D is installed on the inner peripheral side of the cylindrical member 740 (FIG. 19A), and then the drawing process by the cylindrical member drawing process is performed on the cylindrical member 740. This is done by applying (FIG. 19B).

  Here, as shown in FIG. 19 (a), the cylindrical member 740 has an outer diameter after the inner diameter of the restriction bulging portion 740a is subjected to drawing processing (see FIG. 15 (b)) by the outer cylinder drawing process. It is made larger than the outer diameter D402 of the cylindrical member 420 (the 1st outer cylinder part 421 and the 2nd outer cylinder part 422).

In this reference example , the inner diameter of the restriction bulging portion 740a is larger than the outer diameter D402 and smaller than the maximum outer diameter of the vulcanized molded body D (the outer diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). The Therefore, when the vulcanized molded body D is inserted along the axis O direction into the inner peripheral side of the tubular member 440, the rubber film portions 431b and 432b are press-fitted while being elastically deformed.

  In this case, according to the vibration isolator 700, the restriction bulge portion 740a is intermittently arranged in the circumferential direction, so that it is possible to secure a space for receiving the elastically deformed rubber film portions 431b and 432b. The workability of the operation of inserting the vulcanized molded body D along the axis O direction into the inner peripheral side of the cylindrical member 740 can be improved. Further, it is possible to suppress the amount of drawing processing performed on the cylindrical member 740, thereby improving the yield and reducing the processing cost.

  However, the inner diameter of the restriction bulging portion 740a of the tubular member 740 may be larger than the maximum outer diameter of the vulcanized molded body D (the diameter of the outer peripheral surfaces of the rubber film portions 431b and 432b). The operation | work which inserts the vulcanization molded object D along the axis | shaft O direction to the inner peripheral side of the cylindrical member 740 can be performed efficiently.

  In the vibration isolator 700 that has been assembled, as shown in FIG. 19B, in the second stage drawing described above, one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 740 are radially inward. The upper and lower end surfaces (in the direction of the axis O) of the restriction bulging portion 740a of the cylindrical member 740 are caused by the division surface of the first outer cylinder portion 421 and the division surface of the second outer cylinder portion 422. The pressure is maintained from above and below.

  As described above, according to the vibration isolator 700, the restriction bulging portion 740a of the cylindrical member 740 is interposed between the dividing surface of the first outer cylinder portion 421 and the dividing surface of the second outer cylinder portion 422. Therefore, the first outer cylinder part 421 and the second outer cylinder part 422 are separated from each other while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. Can be regulated by the regulation bulge portion 740a.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 740 can be reliably suppressed when a large displacement is input in the direction of the axis O.

In particular, according to this reference example , the restriction bulging portion 740a is formed by deforming a part of the cylindrical member 740 (bulging toward the radially inner side), and the restriction means (first outer cylinder portion). 421 and the means for restricting the movement of the second outer cylinder part 422) are not required to be added, so that the weight can be reduced accordingly. Further, it is not necessary to add another member, and the number of parts is suppressed, so that the part cost can be reduced. Further, as in the case of the fourth reference example (vibration isolation device 400), it is not necessary to attach the regulating means (interposition member 450) to the vulcanized molded body D, so that the assembly cost is reduced as the process becomes unnecessary. This can reduce product costs.

In addition, in this way, the restriction bulging portion 740a is formed as a separate member from the first outer cylinder portion 421 and the second outer cylinder portion 422, and in the case of the fourth reference example (vibration isolation device 400). Similarly, in the structure of the vulcanization mold (for example, the middle mold splitting structure) of the portion that forms the space SP between the dividing surface of the first rubber portion 431 and the dividing surface of the second rubber portion 432, the restriction bulge Since it is not necessary to consider the shape and the like of the portion 740a, the structure of the vulcanization mold can be simplified.

Here, in the fourth reference example (anti-vibration device 400), the interposed member 450 serving as the restricting means is configured as a separate member, and therefore, between the divided surfaces of the first outer cylinder portion 421 and the second outer cylinder portion 422. If the interposition member 450 falls off, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 700, since the restriction bulging portion 740a is formed integrally with the cylindrical member 740, the restriction means (regulation bulging portion 740a) is interposed between the divided surfaces. Can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

Next, with reference to FIG. 20, the vibration isolator 800 in the eighth reference example will be described. In the fourth reference example, by mounting the interposition member 450, the first outer cylinder portion 421 and the second outer tube section 422 has restricted from moving in the direction to close to each other of the split plane, the eighth reference The vibration isolator 800 in the example is configured to restrict the movement without mounting another member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each reference example mentioned above, and the description is abbreviate | omitted.

The vibration isolator 800 in the eighth reference example is different from the vibration isolator 400 in the fourth reference example in that a chamfered surface 840a is formed on the tubular member 840 and the shape of the rubber base 830 at the end in the axis O direction. And the point that the bending process which performs a bending process to the axial O direction edge part of the outer cylinder member 420 is added, and the other structure and assembly method are the same. Therefore, only different points will be described below.

  FIG. 20A is a cross-sectional view of the vulcanized molded body E and the cylindrical member 840 in a state after the cylindrical member 840 is drawn in the cylindrical member drawing step, and FIG. FIG. 10 is a cross-sectional view of the vibration isolator 800 in a state after the outer cylinder member 420 is bent in the bending step.

  As shown in FIG. 20 (a), the rubber base 830 is not covered by the outer cylinder member 420 at the end in the axis O direction, and the cylindrical portion of the first outer cylinder 421 (upper side in FIG. 20 (a)). And the internal peripheral surface of the cylindrical site | part (FIG. 20 (a) lower side) of the 2nd outer cylinder part 422 is exposed. Thereby, in the bending process described later, the cylindrical parts of the first outer cylinder part 421 and the second outer cylinder part 422 can be directly pressed by a caulking die (not shown) without using a rubber film, Bending can be performed with high accuracy.

The cylindrical member 840 is chamfered at the corner on the outer peripheral surface side at the end portion in the axis O direction to form a chamfered surface 840a having a linear cross section. That is, the chamfered surface 840a of the cylindrical member 840 is formed on the opposite side of the chamfered surface 40a (see FIG. 4B) of the cylindrical member 40 in the first reference example . As shown in FIG. 20A, the chamfered surface 840a of the tubular member 840 forms a flat surface perpendicular to the direction of the axis O in the state after being drawn in the tubular member drawing step. Thereby, the edge part of the outer cylinder member 420 to which the bending process was given in the bending process mentioned later can be received firmly.

In the eighth reference example , the vulcanized molded body E is inserted along the axis O direction on the inner peripheral side of the cylindrical member 840, and as shown in FIG. After the application to the cylindrical member 840, the cylindrical portions of the first outer cylinder part 421 and the second outer cylinder part 422 are then bent radially outward in a bending step. As a result, as shown in FIG. 20B, the tubular member 840 is mounted on the vulcanized molded body E, and the assembly thereof (manufacture of the vibration isolator 800) is completed.

The caulking die for performing the bending process is a caulking metal for bending the end part in the axis O direction of the cylindrical member 40 described in the first reference example , except that the direction of the curved recess is different. Since it is the same structure as a type | mold, the description is abbreviate | omitted.

  As described above, according to the vibration isolator 800, the end portions (cylindrical portions) in the axis O direction of the first outer cylinder portion 421 and the second outer cylinder portion 422 are bent outward in the radial direction, The cylindrical member 840 is locked to the end portion in the axis O direction (the chamfered surface 840a). Therefore, by this locking, the first outer cylinder part 421 and the second outer cylinder part 422 are mutually connected while securing the space SP between the division surface of the first rubber part 431 and the division surface of the second rubber part 432. It is possible to restrict the movement in the direction in which the divided surfaces are brought close to each other.

  In other words, the first outer cylinder portion 421 and the second outer cylinder portion 422 are restricted from moving in the direction in which the divided surfaces are brought close to each other without depending on the friction with the inner peripheral surface of the cylindrical member 740. Therefore, the displacement of the first outer cylinder part 421 or the second outer cylinder part 422 with respect to the cylindrical member 840 can be reliably suppressed when a large displacement is input in the direction of the axis O.

In particular, according to the present reference example , by restricting a part of the outer cylinder member 420 (the first outer cylinder part 421 and the second outer cylinder part 422) (bending outward in the radial direction), the regulating means ( (Means for regulating movement of the first outer cylinder part 421 and the second outer cylinder part 422). Therefore, as in the case of the seventh reference example (vibration isolation device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. The structure of the metal mold can be simplified.

Next, the first embodiment will be described with reference to FIGS. In the fourth reference example, by mounting the interposition member 450, the first outer cylinder portion 421 and the second outer tube section 422 has restricted from moving in the direction to close to each other of the split plane, the first embodiment The vibration isolator 900 in this form is configured to restrict the movement without mounting another member (interposition member). In addition, the same code | symbol is attached | subjected to the part same as each reference example mentioned above, and the description is abbreviate | omitted.

Figure 21 (a) is a bottom view of the first outer tube section 921 in the first embodiment, FIG. 21 (b), the first outer tube section 921 in XXIb-XXIb line shown in FIG. 21 (a) It is sectional drawing. In addition, since the 1st outer cylinder part 921 and the 2nd outer cylinder part 922 are the members (structure) which are the same, and only a name differs, it demonstrates the 1st outer cylinder part 921 below, The description of the second outer cylinder portion 922 is omitted.

  As shown in FIG. 21, the first outer cylinder portion 921 has a restriction projection 921b from the bottom surface (the upper surface in FIG. 21 (b), that is, the divided surface) of the portion where the cross-sectional shape is curved in an arc shape. Are partially projected along the direction of the axis O. The restricting protrusion 921b is interposed between the divided surface of the first outer cylinder part 421 and the divided surface of the second outer cylinder part 422, thereby allowing the first outer cylinder part 421 and the second outer cylinder part 422 to move. It is a part for regulation, and is formed in a rectangular shape when viewed from the front, and a plurality (two in the present embodiment) are arranged at positions that are equally spaced in the circumferential direction (that is, the phases are different by 180 °). The

  Next, the vulcanized molded body F will be described with reference to FIG. 22A is a perspective view of the outer cylinder member 920, and FIG. 22B is a side view of the vulcanized molded body F. FIG.

The vulcanized molded body F and the vibration isolator 900 in the first embodiment are different from the vulcanized molded body D and the vibration isolator 400 in the fourth reference example in the first outer cylinder portion 921 and the second outer cylinder portion. The only difference is that the restricting protrusions 921b and 922b are formed on 922, and the other configuration and assembly method are the same. Therefore, only different points will be described below.

As in the case of the fourth reference example (vulcanized molded body D), the vulcanized molded body F includes an inner cylindrical member 410 and an outer cylindrical member 920 (first outer cylindrical portion 921 and second outer cylindrical portion 922). The rubber base 430 (the first rubber part 431 and the second rubber part 432) is vulcanized and molded while being installed in the vulcanization mold, and the outer peripheral surface of the inner cylinder member 410 and the outer cylinder member 920 (first outer cylinder part). 921 and the inner peripheral surface of the second outer cylinder portion 922) are connected by a rubber base 430 to manufacture.

  In this case, when the first outer cylinder portion 921 and the second outer cylinder portion 922 are installed in the vulcanization mold, as shown in FIG. 22 (a), the circumferential positioning is performed and the restriction protrusions 921b, 922b are arranged. It is set as the state which the projecting front end surfaces contact | abut. As a result, the position of the split surface of the middle mold that supports the split surfaces of the first outer cylinder section 921 and the second outer cylinder section 922 is set to a position corresponding to the restricting protrusions 921b and 922b (that is, the mold release direction of the middle mold is set). 22B), the space SP formed between the divided surfaces of the first rubber part 431 and the second rubber part 432 as shown in FIG. It can exist continuously over the entire circumference in the circumferential direction. As a result, the spring constant in the axis O direction can be increased while the spring constant in the twisting direction and the spring constant in the direction perpendicular to the axis O are reduced.

  FIG. 23A is a top view of the vibration isolator 900, and FIG. 23B is a cross-sectional view of the vibration isolator 900 along the line XXIIIb-XXIIIb in FIG.

As shown in FIG. 23, the vibration isolator 900 in the first embodiment is assembled in the same manner as in the case of the vibration isolator 400 in the fourth reference example (see FIG. 16). This is performed by inserting F along the axis O direction and installing the vulcanized molded body F on the inner peripheral side of the tubular member 440, and then subjecting the tubular member 440 to a drawing process by a tubular member drawing step.

  As shown in FIG. 23B, the vibration isolator 900 that has been assembled is such that the one end side in the axis O direction and the other end side in the axis O direction of the cylindrical member 440 are in the radial direction in the second stage drawing process described above. With this deformation, the restricting projection 921b of the first outer cylinder portion 921 and the restricting projection 922b of the second outer cylinder portion 922 are brought into a state in which the projecting leading end surfaces are butted in the axis O direction. .

  As described above, according to the vibration isolator 900, the restriction protrusions 921b and 922b protrude from the dividing surfaces of the first outer cylinder portion 921 and the second outer cylinder portion 922, thereby dividing the first rubber portion 431. The first outer cylinder portion 921 and the second outer cylinder portion 922 are restricted from moving in a direction in which the respective divided surfaces are brought close to each other while securing the space SP between the surface and the divided surface of the second rubber portion 432. be able to.

  In other words, the movement of the first outer cylinder portion 921 and the second outer cylinder portion 922 in the direction in which the divided surfaces are brought close to each other is regulated without depending on the friction with the inner peripheral surface of the cylindrical member 440. Therefore, the displacement of the first outer cylinder portion 921 or the second outer cylinder portion 922 relative to the cylindrical member 440 can be reliably suppressed when a large displacement is input in the direction of the axis O.

In particular, according to the present embodiment, by restricting a part of the outer cylinder member 920 (the first outer cylinder part 921 and the second outer cylinder part 922), the restricting means (the first outer cylinder part 921 and the first outer cylinder part 921 and the second outer cylinder part 922). 2 means for restricting the movement of the outer cylindrical portion 922). Therefore, as in the case of the seventh reference example (vibration isolation device 700), the weight can be reduced, and the product cost can be reduced along with the reduction of the component cost and the assembly cost. The structure of the metal mold can be simplified.

Here, in the fourth reference example (anti-vibration device 400), the interposed member 450 serving as the restricting means is configured as a separate member, and therefore, between the divided surfaces of the first outer cylinder portion 421 and the second outer cylinder portion 422. If the interposition member 450 falls off, there is a risk that the effect of suppressing displacement will not be exhibited. On the other hand, according to the vibration isolator 900, the restricting protrusions 921b and 922b are formed integrally with the first outer cylinder part 921 and the second outer cylinder part 922, so that the restricting means (the restricting protrusion 921b is provided between the divided surfaces. , 922b) can be maintained. Therefore, it is possible to reliably exhibit the effect of suppressing displacement and improve its reliability.

FIG. 24A is a perspective view of the outer cylinder member 1020 in the second embodiment, and FIG. 24B is a perspective view of the outer cylinder member 1120 in the third embodiment. With reference to Fig.24 (a) and FIG.24 (b), the outer cylinder members 1020 and 1120 in 2nd and 3rd embodiment are demonstrated.

The outer cylinder members 1020 and 1120 are different from the outer cylinder member 920 in the first embodiment in that the number of arrangement of the restriction protrusions 921b, 922b, and 1122b is different, or the protrusion height of the restriction protrusions 1122b is different. Except for this point, the other configurations are the same. Therefore, only different points will be described.

As shown in FIG. 24 (a), the outer cylinder member 1020 in the second embodiment has four restricting projections 921b and 922b around the dividing surfaces of the first outer cylinder part 1021 and the second outer cylinder part 1022, respectively. Protruding at equal intervals in the direction. Thereby, since the area | region where the projecting front end surfaces of regulation protrusion 921b, 922b contact | abut can be disperse | distributed to the circumferential direction, the 1st outer cylinder part 1021 and the 2nd outer cylinder part 1022 can mutually separate a dividing surface. It is possible to stably regulate movement in the approaching direction.

As shown in FIG. 24B, in the outer cylinder member 1120 according to the third embodiment, the restriction projections are not formed on the first outer cylinder part 421, and the restriction protrusions 1122b are formed only on the second outer cylinder part 1122. The In the present embodiment, two restricting projections 1122b are projected from the dividing surface along the axis O direction at positions where the phases are different by 180 °. The restricting protrusion 1122b is configured in the same manner as the restricting protrusions 921b and 922b except that the protruding height from the dividing surface is doubled.

According to the outer cylinder member 1120 in the third embodiment, the first outer cylinder portion 421 is not formed with the restricting projection, so that the directionality in the circumferential direction can be eliminated. Thereby, when installing the outer cylinder member 1120 in the vulcanization mold, it is not necessary to perform the circumferential alignment of the first outer cylinder member 421 and the second outer cylinder member 1122. Therefore, workability in installation work can be improved.

Having described the present invention based on reference examples and embodiments, the present invention is not intended to be limited to the above-mentioned Reference Examples and embodiments, various improvements and modifications within a scope not departing from the gist of the present invention It is easy to guess that this is possible.

The numerical values given in the above reference examples and the embodiments are merely examples, and other numerical values can naturally be adopted. For example, values such as dimensions (outer diameters D1 to D4, D401 to D404, etc.) and fastening allowances of each component can be arbitrarily set.

Some or all of the anti-vibration device in the above Reference Examples or the respective embodiments, in combination with some or all of the anti-vibration device according to another reference example or embodiment, or, in other reference example or embodiment The vibration isolator may be configured by replacing some or all of the vibration isolator in the embodiment.

In the first to third reference examples , in the vulcanized molded bodies A to C, the first rubber portion 31 and the second rubber portion 32 are divided (the respective divided surfaces are separated in the axis O direction). However, the present invention is not necessarily limited to this, and the divided surface of the first rubber part 31 and the divided surface of the second rubber part 32 are part of them (the outer peripheral surface side of the bulging part 12 of the inner cylinder member 10). May be connected with each other. On the other hand, in the fourth to reference examples and the first to third embodiments, the case where the divided surface of the first rubber portion 431 and the divided surface of the second rubber portion 432 are partially connected is described. It is not restricted to this, The 1st rubber part 431 and the 2nd rubber part 432 may be divided | segmented.

In the first to third reference examples , the split surfaces of the first outer cylinder portions 21 and 321 and the split surfaces of the second outer cylinder portions 22 and 322 are axes in the completed state (state of the vibration isolator 100 to 300). Although the case where it separated in the O direction was demonstrated, it is not necessarily restricted to this, In the completion state, the division surface of the 1st outer cylinder parts 21 and 321 and the division surface of the 2nd outer cylinder parts 22 and 322 May be in contact with each other.

  That is, in the rubber base compression step, the rubber base 430 (the first rubber portion 31 and the first rubber portion 31) is moved to a position where the split surfaces of the first outer cylinder portions 21 and 321 and the split surfaces of the second outer cylinder portions 22 and 322 abut. 2) the rubber part 32) is compressed in the direction of the axis O, and in this state, the cylindrical member 40 is drawn in the cylindrical member drawing process, and in the bending process, the end of the cylindrical member 40 at the end in the axis O direction. You may manufacture the vibration isolator 100-300 so that it may be in the said state by giving a bending process.

On the other hand, in the first to third reference examples , the rubber base compression step may be omitted. That is, after the outer cylinder squeezing process, the process may be shifted to the cylindrical member squeezing process without performing the rubber base compressing process (without providing the rubber base 430 with preliminary compression in the axis O direction).

In each of the above reference examples and each embodiment, the case where the rubber film portions 33, 34, 233, 234, 431a, 431b are covered on the outer peripheral surface of the outer cylinder member 20, 320, 420, 620, 720 has been described. However, the present invention is not necessarily limited thereto, and instead or in addition to this, rubber film portions 33, 34, 233, 234, 431a and 431b are provided on the inner peripheral surface of the cylindrical members 40 and 440. You may do it.

In the first to third reference examples , the case where the bending process is performed (bending is performed on the end portion in the axis O direction of the cylindrical member 40) has been described. However, the present invention is not necessarily limited thereto, and the bending process is omitted. And you may manufacture the vibration isolator 100-300. That is, the vulcanized molded products A to C are formed on the cylindrical member 40 by the holding force between the cylindrical member 40 that has been subjected to drawing processing in the cylindrical member drawing step and the rubber film portions 33, 34, 333, and 334. You may hold | maintain on the inner peripheral side.

Although description thereof is omitted in the first to third reference examples , through holes may be formed in the first outer cylinder portions 21 and 321 and the second outer cylinder portions 22 and 322. Since the fluidity of the rubber-like elastic body in the vulcanization molding process can be ensured by the through holes, the yield of the rubber film portions 33, 34, 333, 334 connected to the first rubber portion 31 and the second rubber portion 32 is increased. be able to.

In each of the above reference examples and each embodiment, the description is omitted, but after the bending process, the inner cylinder members 10 and 410 are subjected to a diameter expansion process (the inner cylinder member 10 is compressed in the axis O direction, and the end in the axis O direction). You may give the process which expands the area of a seat surface by enlarging a part.

In the first, second and fourth to eighth reference examples and the first to third embodiments, the outer cylinder squeezing step is performed (outer cylinder members 20, 420, 920, 1020, 1120 (first outer cylinder portion). 21, 421, 921, 1021, 1121 and the second outer cylinder part 22, 422, 922, 1022, 1122) have been described. However, the present invention is not necessarily limited to this, and the outer cylinder drawing step May be omitted and the vibration isolator 100, 200, 400, 700, 800, 900 may be manufactured.

In the third reference example , the case where the outer cylinder member 320 is formed by casting has been described. However, the present invention is not necessarily limited thereto, and the outer cylinder member 320 may be formed by forging or cutting, for example.

In the fourth to eighth reference examples and the first to third embodiments, the case where the rubber base compression step is omitted has been described. However, the invention is not necessarily limited thereto, and the rubber base 430, The vibration isolator 400, 700, 800, 900 may be manufactured in a state where the pre-compression in the direction of the axis O is applied to 830.

In the seventh reference example , the case where the restriction bulging portion 740a is intermittently formed in the circumferential direction has been described. However, the present invention is not necessarily limited thereto, and the restriction bulging portion 740a is continuously formed in the circumferential direction. You may do it.

In the third embodiment, the case where the two restricting projections 1122b are protruded by changing the phase by 180 ° has been described. However, the present invention is not limited to this, and the four restricting projections are equally spaced in the circumferential direction. You may project 1122b. In this case, the region where the projecting leading end surface of the restricting projection 1122b is in contact with the dividing surface of the first outer cylinder part 421 is dispersed in the circumferential direction, and the first outer cylinder part 421 and the second outer cylinder part 1122 are It is possible to stably regulate the movement in the direction in which the divided surfaces come close to each other.

In the third embodiment, the two restricting projections 1122b (that is, the projecting height is twice that of the restricting projections 921b and 922b) are projected from the dividing surface of the second outer cylindrical portion 1122. However, the present invention is not limited to this, and one of the two restricting projections 1122b protrudes from the dividing surface of the first outer cylinder portion and the other protrudes from the dividing surface of the second outer cylinder portion. May be provided. In this case, since the first outer cylinder part and the second outer cylinder part can be used as a common part, it is possible to reduce the part cost.

  Here, the “concave spherical surface” described in claim 1 does not require a complete spherical shape, but is formed as a concave surface disposed opposite to the convex spherical surface at least in the bulging portion of the inner cylinder member. If it is done, it is enough. Similarly, “concentric with a convex spherical surface” does not require that the centers coincide completely, and the center of the concave spherical surface is viewed from the first outer cylindrical portion and the second outer cylindrical portion, This means that it suffices if it is located on the same side as the center of the convex spherical surface.

100, 200, 300, 400, 700, 800, 900 Vibration isolator 10, 410 Inner cylinder member 12, 412 Swelling part 20, 320, 420, 920, 1020, 1120 Outer cylinder member 21, 321, 421, 921, 1021, 1121 1st outer cylinder part 22,322,422,922,1022,1122 2nd outer cylinder part 921b, 922b, 1122b Restriction protrusion (regulation means)
IS concave inner peripheral surface 30, 430, 830 Rubber base 31, 431 First rubber part 32, 432 Second rubber part 33, 333, 431a, 431b Rubber film part 34, 334, 432a, 432b Rubber film part 40, 440, 840 Cylindrical member 740a Restricted bulging portion (regulating means)
450, 550, 650 Interposition member (regulation means)
O-axis SP space

Claims (8)

An inner cylindrical member having a spherical bulging portion bulging outward in the radial direction at the center in the axial direction;
The bulging portion of the inner cylinder member has a concave inner circumferential surface that is formed in a concave spherical surface concentric with the convex spherical surface and surrounds the bulging portion of the inner cylinder member, and is disposed on the outer peripheral side of the inner cylinder member. An outer cylinder member,
A rubber base configured to connect the outer peripheral surface of the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the outer cylindrical member and configured from a rubber-like elastic body;
The outer cylinder member is divided into two in the axial direction into a first outer cylinder part and a second outer cylinder part, and the rubber base is formed on the outer peripheral surface of the bulging part of the inner cylinder member and the first outer cylinder part. At least a first rubber portion that connects between the concave inner peripheral surfaces of the inner cylindrical member, and a second rubber portion that connects between the outer peripheral surface of the bulging portion of the inner cylindrical member and the concave inner peripheral surface of the second outer cylindrical portion. A vibration isolator divided into two axially on the outer cylinder member side,
A cylindrical member formed in a cylindrical shape and disposed on the outer peripheral side of the first outer cylindrical portion and the second outer cylindrical portion and holding and fixing the first outer cylindrical portion and the second outer cylindrical portion;
The first outer cylinder part and the second outer cylinder part, which are interposed between the dividing surface of the first outer cylinder part and the dividing surface of the second outer cylinder part and are held by the cylindrical member, are divided from each other. A regulating means for regulating movement in a direction in which the surfaces are brought close to each other, and
The first outer cylinder part and the second outer cylinder part in a state in which the dividing surface of the first rubber part and the dividing surface of the second rubber part are separated in the axial direction and a space is formed between the dividing surfaces. Is held and fixed by the cylindrical member.   The maximum outer diameter dimension at the bulging portion of the inner cylinder member is made larger than the minimum inner diameter dimension at the axial end openings of the first outer cylinder section and the second outer cylinder section. Item 1. A vibration isolator according to item 1.   And a restriction projection formed integrally with at least one of the first outer cylinder portion and the second outer cylinder portion and partially protruding along the axial direction from the dividing surface, wherein the restriction projection is the restriction means. The vibration isolator according to claim 1 or 2, wherein   The cylindrical member is provided between the split surface of the first outer cylinder part and the split surface of the second outer cylinder part, and the interposed member has two positions whose phases are different by 180 degrees. 3 is divided into two parts, or one part is divided, and the interposed member is used as the restricting means.   The cylindrical member is formed such that an inner peripheral surface portion at the center in the axial direction bulges inward in the radial direction, and is interposed between the divided surface of the first outer cylindrical portion and the divided surface of the second outer cylindrical portion. The anti-vibration device according to claim 1, further comprising a restriction bulge portion that is configured to be the restriction bulge portion. The first outer cylinder part and the second outer cylinder part are formed in a shape including the concave inner peripheral surface from a material having a constant plate thickness,
The first outer cylinder part and the second outer cylinder part are held and fixed by the cylindrical member in a state in which the first outer cylinder part and the second outer cylinder part are drawn. Item 6. The vibration isolator according to any one of Items 1 to 5. A rubber film portion that is covered with at least a part of at least one of the outer peripheral surface of the first outer cylinder portion and the second outer cylinder portion or the inner peripheral surface of the cylindrical member and is made of a rubber-like elastic body ,
The first outer cylinder part and the second outer cylinder part and the cylindrical member are made of a metal material,
7. The cylindrical member according to claim 1, wherein the first outer cylinder portion and the second outer cylinder portion are held and fixed by the cylindrical member by drawing the cylindrical member. The vibration isolator as described. The first outer cylinder part and the second outer cylinder part are formed from a material having a constant plate thickness into a shape including the concave inner peripheral surface, so that the outer peripheral surface on the back side of the concave inner peripheral surface is an axis. The shape is reduced in diameter toward the end of the direction,
The cylindrical member is subjected to drawing processing, and one end side in the axial direction and the other end side in the axial direction of the cylindrical member are on the back side of the concave inner peripheral surface of the first outer cylinder part and the second outer cylinder part. The vibration isolator according to any one of claims 1 to 7, wherein the vibration isolator is formed in a shape reduced in diameter along the outer peripheral surface.

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