JP4871895B2 - Cylindrical vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cylindrical vibration isolator and a method for manufacturing the same, and in particular, a shaft member attached to one of the members to be anti-vibrated and a synthetic resin outer cylinder member are interposed therebetween. The present invention relates to an improved structure of a cylindrical vibration isolator that is elastically connected by a rubber elastic body, and a method for advantageously manufacturing such a cylindrical vibration isolator.

  Conventionally, a shaft member that is interposed between two members constituting a vibration transmission system and is attached to one of the members to be vibration-proof connected as a kind of vibration-proof connection body that connects the two members. And an outer cylinder member that is disposed around such a shaft member at a predetermined distance outward in a direction perpendicular to the axis and is attached to the other of the two members. 2. Description of the Related Art A cylindrical vibration isolator having a structure connected by a rubber elastic body is known. Further, in recent years, resinization of the outer cylinder member has been studied in order to reduce the weight and cost of the vibration isolator, and in fact, a cylindrical vibration isolator having an outer cylinder member made of synthetic resin is, for example, It has been used for engine mounts for automobiles, mounting bushes for torque rods, and the like.

  By the way, in this type of cylindrical vibration isolator, as disclosed in Patent Document 1 and the like, generally, a main rubber elastic body is arranged around a shaft member and spaced apart outward in the direction perpendicular to the axis. And an integrally vulcanized molded product that is integrally vulcanized and bonded to the outer peripheral surface of the shaft member and connects the shaft member and the cylindrical portion. It is fixed to the inner peripheral surface of the resin outer cylinder member. Further, a space extending through in the axial direction is provided between the cylindrical portion and the connecting portion of such an integrally vulcanized molded product (main rubber elastic body), and the stopper portion is provided in the space. The cylindrical portion is integrally formed in a state of protruding in the direction perpendicular to the axis from the outer cylinder member side toward the shaft member side.

  In the conventional cylindrical vibration isolator having such a structure, the spring characteristic in the direction perpendicular to the axis of the main rubber elastic body is softened due to the presence of the void, and the direction perpendicular to the axis between the outer cylinder member and the shaft member. The relative displacement amount of the two members is regulated by the contact of the connecting portion vulcanized and bonded to the outer peripheral surface of the shaft member and the stopper portion. It is possible to prevent excessive displacement between the two.

  In such a cylindrical vibration isolator, the protrusion height of the stopper portion from the outer cylinder member is appropriately changed so that the outer cylinder member and the shaft member abut against each other when the relative displacement is excessive in the direction perpendicular to the axis. By changing various distances in the direction perpendicular to the axis between the protruding tip surface of the stopper part to be brought into contact with the outer surface of the connecting part, so-called stopper clearance, the spring characteristic of the main rubber elastic body in the direction perpendicular to the axis, The amount of regulation of the relative displacement of the member and the shaft member in the direction perpendicular to the axis is tuned. Therefore, depending on the type and size of the member to be anti-vibration connected, the required anti-vibration characteristics and stopper effect Is to be secured.

  Conventionally, a plurality of types of cylindrical anti-vibration devices used for anti-vibration coupling of various types and sizes of members, that is, a plurality of types of cylindrical anti-vibration devices having different anti-vibration characteristics and stopper effects. When manufacturing the device, normally, the body rubber elastic body has the same shape, but the integral vulcanized molded products that differ from each other only in the protruding height of the stopper are manufactured for each type of cylindrical vibration isolator. There was much to be done. In general, a plurality of types of cylindrical vibration isolators having different anti-vibration characteristics and stopper effects have a relatively small number of flows for each type and are generally produced in a variety of small quantities. . For this reason, when manufacturing such multiple types of cylindrical vibration isolator, there are many types of integral vulcanization molded products in which the shape of the main rubber elastic body is the same and only the protruding heights of the stopper portions are different from each other. However, a small amount of each was produced. Therefore, conventionally, when manufacturing a plurality of types of cylindrical vibration isolators having different anti-vibration characteristics and stopper effects, an integrally vulcanized molded product integrally having a main rubber elastic body and a stopper portion is manufactured. However, it is inevitable that the production cost of the molding die and the man-hours for changeover during production increase inevitably, resulting in a decrease in production efficiency. As a result, an increase in the manufacturing cost of the cylindrical vibration isolator and a decrease in production efficiency were caused.

  In addition, in a conventional cylindrical vibration isolator, generally, when a vulcanization molding of an integrally vulcanized molded product composed of a main rubber elastic body vulcanized and bonded to the outer peripheral surface of a shaft member and a stopper portion, A so-called stopper clearance is formed. At this time, it is difficult to make the stopper clearance sufficiently small due to the strength of the mold. Furthermore, the stopper clearance is made zero, that is, the connecting portion and the stopper portion are in contact with each other. It was impossible at all. Therefore, the spring characteristics in the direction perpendicular to the axis of the main rubber elastic body and the displacement restriction characteristics of the outer cylinder member and the shaft member by the stopper can be tuned only within a limited range.

  Under such circumstances, Patent Document 2 discloses that the main rubber elastic body vulcanized and bonded to the outer peripheral surface of the shaft member is fixed to the inner peripheral surface of the outer tube member made of synthetic resin, and the main rubber elastic body is The inner peripheral surface of the outer cylinder member in a state where two stopper members made of separate independent rubber members are arranged inside the outer cylinder member with a space provided on both sides sandwiching the shaft member therebetween. A cylindrical anti-vibration device having a structure fixed to is clarified.

  In the cylindrical vibration isolator having such a structure, for example, a single type of main body rubber elastic body is used as a stopper member with a thickness (in a state where it is attached to the cylindrical vibration isolator). The size of the stopper clearance can be determined by using the one appropriately selected from various stopper members having different dimensions (corresponding to the height of the protrusion from the outer cylindrical member). Accordingly, it can be easily and arbitrarily set. Therefore, even if the stopper clearance is small or zero, it is advantageously ensured with a desired dimension, so that the necessary anti-vibration characteristics and the stopper effect can be effectively exhibited. It will be.

  According to such a structure, when manufacturing a plurality of types of cylindrical vibration isolators having different vibration isolating characteristics and stopper effects, the thickness of some of the common single type main rubber elastic bodies is increased. Various types of stopper members having different lengths are manufactured separately from each other. Therefore, when manufacturing a plurality of types of cylindrical vibration isolator, a large number of types of integrally vulcanized molded products integrally having a main rubber elastic body and a stopper portion are formed according to the number of types. Unlike the conventional structure that needs to be manufactured using a mold, only the stopper member is used in a number corresponding to the number of types of vibration isolators to be manufactured. Just make it. In addition, the manufacturing cost of each cylindrical vibration isolator when manufacturing a plurality of types of cylindrical vibration isolators having different vibration isolating characteristics and stopper effects can be advantageously reduced, and the production Efficiency can also be increased effectively.

  However, in such a conventional cylindrical vibration isolator, the main rubber elastic body vulcanized and bonded to the outer peripheral surface of the shaft member and the two stopper members are formed so that a space is formed between them. After being set at a predetermined position in the molding die, the molten resin is filled into the molding cavity by injection or the like and solidified to form the outer cylinder member, and at the same time, the inner circumference of the outer cylinder member The main body rubber elastic body and two stopper members are fixed to the surface. Therefore, when carrying out such a manufacturing operation, the main rubber elastic body and each stopper member are accurately separated from each other so as to ensure a stopper clearance of a preset size. In addition, it is necessary to set it in the mold while positioning it, and before setting the main rubber elastic body and the two stopper members into the mold, For each one, it was necessary to perform an adhesion processing operation for applying an adhesive for adhering each member to the resin outer cylinder member. Therefore, in the conventional cylindrical vibration isolator as described above, it is inevitable that the number of work steps at the time of manufacturing increases and the entire manufacturing work becomes extremely complicated.

Japanese Patent Laid-Open No. 2003-200531 JP 7-167185 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that a desired stopper clearance is ensured and the necessary vibration-proof characteristics and stopper effects are obtained. Can be effectively demonstrated, and the number of man-hours during manufacturing can be reduced, and the manufacturing cost can be reduced effectively when multiple types of products with different anti-vibration characteristics and stopper effects are manufactured. It is an object of the present invention to provide a structure of a cylindrical vibration isolator improved so as to obtain. In addition, in the present invention, it is an object of the present invention to provide a method for advantageously manufacturing such a cylindrical vibration isolator.

  And in the present invention, in order to solve the above-mentioned problem or the problem grasped from the description of the entire specification and the drawings, it can be advantageously implemented in various aspects as listed below, Moreover, each aspect described below can be employed in any combination. The aspects or technical features of the present invention are not limited to those described below, but can be recognized based on the description of the entire specification and the inventive concept disclosed or suggested in the drawings. It should be understood that there is.

<1> A main rubber elastic body interposed between the shaft member and an outer cylindrical member made of synthetic resin and spaced around the shaft member in the direction perpendicular to the axis. And providing a space extending through the main rubber elastic body in the axial direction while projecting in the direction perpendicular to the axis from the outer cylindrical member side toward the shaft member side in the space. A cylindrical vibration isolator configured by providing a stopper portion made of an elastic material, wherein the main rubber elastic body is disposed around the shaft member and spaced outward in the direction perpendicular to the axis. And a connecting portion for connecting the cylindrical portion and the shaft member, and a through-hole is provided in a cylindrical portion facing the connecting portion with the space interposed therebetween. On the other hand, an independent stopper part forming member having the stopper part, which is separate from the main rubber elastic body, The stopper is inserted into the cavity of the main rubber elastic body through the through hole of the cylindrical portion of the main rubber elastic body, and is fitted into the through hole and assembled to the main rubber elastic body. As a result, an assembly comprising the stopper portion forming member and the main rubber elastic body is formed, and the assembly is fixed to the inner peripheral surface of the outer cylinder member over the entire outer peripheral surface thereof. By doing so, the shaft member and the outer cylinder member are connected by the main rubber elastic body, and the stopper portion forming member is fixed to the inner peripheral surface of the outer cylinder member, so that the stopper A cylindrical vibration isolator characterized in that a portion projects in a direction perpendicular to the axis from the outer cylinder member side toward the shaft member side in the space of the main rubber elastic body.

<2> The stopper portion forming member integrally includes the stopper portion and a fitting portion fitted into the through hole of the cylindrical portion of the main rubber elastic body, and an inner periphery of the fitting portion. The above aspect <1>, wherein an engagement mechanism is provided between the surface and the outer peripheral surface of the through hole to engage with each other and maintain the fitted state between the fitting portion and the through hole. The cylindrical vibration isolator according to 1.

<3> The main rubber elastic body is provided with a plurality of voids with the shaft member interposed therebetween, and a plurality of cylindrical portions facing the connecting portion with the plurality of voids interposed therebetween. Each of the through-holes is further provided, and the plurality of stopper-portion forming members are inserted into the respective voids through the plurality of through-holes. Along with the rubber elastic body, the plurality of stopper portions are fixed to the inner peripheral surface of the outer cylinder member so that the plurality of stopper portions are perpendicular to the shaft member side from the outer cylinder member side in the plurality of cavities. The cylindrical vibration isolator according to the above aspect <1> or <2>, which is provided so as to be protruded to the surface.

<4> The cylindrical vibration isolator according to any one of the above aspects <1> to <3>, in which the stopper portion is positioned in contact with the coupling portion in the space.

<5> A shaft member and an outer cylinder member made of synthetic resin and arranged around the shaft member and spaced outward in a direction perpendicular to the shaft are attached to a main rubber elastic body interposed therebetween. And providing a space extending through the main rubber elastic body in the axial direction while projecting in the direction perpendicular to the axis from the outer cylindrical member side toward the shaft member side in the space. A method of manufacturing a cylindrical vibration isolator configured by providing a stopper portion made of an elastic material, wherein: (a) a cylindrical portion that is arranged around the shaft member and spaced outward in a direction perpendicular to the axis; The body rubber elastic body, which is integrally vulcanized and bonded to the outer peripheral surface of the shaft member and connects the cylindrical portion and the shaft member, sandwiches the space therebetween. A step of preparing an integrally vulcanized molded article in which a through hole is provided in a cylindrical portion facing the connecting portion; A step of preparing an independent stopper portion forming member separate from the main rubber elastic body, and (c) the stopper portion of the stopper portion forming member as the cylindrical portion of the integral vulcanization molded product. By fitting the stopper-forming member into the through-hole in a state of being inserted into the void of the integrated vulcanized molded product through the through-hole provided in the integrated vulcanized molded product, A step of forming an assembly comprising the stopper portion forming member and the integrally vulcanized molded product, and (d) the outer cylinder member in which a part of the cavity surface is the entire outer peripheral surface of the assembly. The shaft member is filled with a molten resin in a molding cavity to be fed and solidified, and the outer cylindrical member is molded with the entire outer peripheral surface of the assembly being fixed to the inner peripheral surface thereof. And the outer cylinder member are connected by the rubber elastic body. In addition, the stopper portion forming member is fixed to the inner peripheral surface of the outer cylinder member, and the stopper portion is placed in the space of the main rubber elastic body from the outer cylinder member side to the shaft member side. And a step of providing the projection so as to project in a direction perpendicular to the axis.

  In the cylindrical vibration isolator having such a structure according to the present invention, the stopper portion forming member having the stopper portion and the main rubber elastic body are constituted by separate members independent from each other. Similar to the conventional device in which the stopper member and the main rubber elastic body are separate members, a single type of main body is used in common when manufacturing multiple types of cylindrical vibration isolators having different anti-vibration characteristics and stopper effects. A rubber elastic body is manufactured, and as a stopper part forming member, the height of the stopper part (the height of the stopper part protruding from the outer cylinder member when mounted on the cylindrical vibration isolator) is different from each other. It is only necessary to manufacture various stopper part forming members, so that a molding die that requires preparation of a plurality of types can be made relatively small for molding the stopper part forming member. It is, it is possible to reduce the production cost of the mold. Further, since the stopper portion forming member itself is smaller than the integrally vulcanized molded product including the main rubber elastic body, the number of products can be increased, and thus the production efficiency can be advantageously improved. . As a result, when manufacturing a plurality of types of cylindrical vibration isolators having different vibration isolation characteristics and stopper effects, the manufacturing cost of each cylindrical vibration isolator can be advantageously reduced. The productivity can be effectively increased. In addition, even if the stopper clearance is sufficiently small or zero, it is advantageously ensured with the desired dimensions, so that the required anti-vibration characteristics and the stopper effect are effective. Can be demonstrated.

  And in the cylindrical vibration isolator according to the present invention, in particular, the stopper part forming member having the stopper part is fitted into the through hole provided in the cylindrical part and assembled to the main rubber elastic body. The assembled body is fixed to the inner peripheral surface of the outer cylindrical member on the entire outer peripheral surface thereof, so that the shaft member and the outer cylindrical member are connected by the main rubber elastic body, and the stopper The part forming member is fixed to the inner peripheral surface of the outer cylinder member. Therefore, for example, the outer cylinder member is molded by resin injection molding to the molding die, and the entire outer peripheral surface of the assembly is made of the outer cylinder member by the resin injection molding operation to the molding die. In the case of being fixed to the inner peripheral surface, when performing the resin injection molding operation on such a molding die, first, an adhesive processing operation for applying an adhesive to the entire outer peripheral surface of the assembly After that, an operation of setting the entire assembly in the molding die is performed.

  Therefore, in such a cylindrical vibration isolator, unlike the conventional apparatus, when performing the molding operation of the outer cylinder member by resin injection molding to the molding die, the main rubber elastic body and the stopper portion forming member In addition, it is not necessary to perform the bonding process separately one by one, and the main rubber elastic body and the stopper portion forming member are set one by one in a predetermined position in the molding die. The trouble of doing it can be saved. As a result, the number of work steps during production can be advantageously reduced, and the production work can be simplified.

  Therefore, in the cylindrical vibration isolator according to the present invention as described above, a desired stopper clearance including zero is advantageously ensured, and the necessary vibration isolating characteristics and the stopper effect are more effectively exhibited. Can be done. In addition, the number of work man-hours at the time of manufacturing can be reduced, and not only productivity can be effectively increased, but also the manufacturing cost when manufacturing a plurality of types having different anti-vibration characteristics and stopper effects from each other, It can be reduced very advantageously.

  Even in the method for manufacturing a cylindrical vibration isolator according to the present invention, the substantially same operation and effect as the excellent effects exhibited in the cylindrical vibration isolator according to the present invention described above are extremely effective. Thus, a cylindrical vibration isolator that exhibits such excellent characteristics can be advantageously manufactured.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an automotive engine mount as an embodiment of a cylindrical vibration isolator according to the present invention in a cross-sectional form thereof, and FIG. 2 shows a longitudinal cross-sectional form of such an engine mount. It is shown. In these drawings, an engine mount 10 is positioned with an inner cylinder fitting 12 as a shaft member and a predetermined distance away from the inner cylinder fitting 12 at a predetermined distance outward in the radial direction (perpendicular to the axis). And a structure in which the inner cylinder fitting 12 and the outer cylinder member 14 are elastically connected by a main rubber elastic body 16 interposed therebetween. It is said that.

  In the engine mount 10 of the present embodiment, the inner cylinder fitting 12 is attached to any one of a body and a power unit (not shown), which are two members to be vibration-proof connected. An outer cylinder member 14 is attached to either one of them, and the intended vibration-proof characteristic is exerted mainly on the vibration load input in the radial direction (vertical direction perpendicular to the axis) in FIG. To get.

  More specifically, the inner cylinder fitting 12 has a thick, small-diameter cylindrical shape, and a pivot (not shown) (for example, a mounting bolt) is inserted into the inner hole 18 to be attached to the body or the power unit. It is supposed to be.

  On the other hand, the outer cylinder member 14 is formed using a synthetic resin material having strength and rigidity that can withstand an input load, such as a fiber reinforced polyamide resin, and has a shorter shaft than the inner cylinder fitting 12. A substantially thick cylindrical cylindrical body portion 20 having a length in the direction and a larger diameter, and a substantially thick flat plate mounting plate portion 22 projecting at two locations on the outer peripheral surface of the cylindrical body portion 20. , 22 are integrated. Further, in each of the mounting plate portions 22, a metal mounting sleeve 24 having a cylindrical shape extends in the plate thickness direction and opens outward on both sides in the thickness direction of the mounting plate portion 22. Each is buried. Thus, the outer cylinder member 14 is attached to the body or the power unit at each of the attachment plate portions 22 by bolts or the like inserted through the two attachment sleeves 24 and 24.

  And in this embodiment, while the cylindrical part 20 of such an outer cylinder member 14 is distribute | arranged to the radial direction outward of the inner cylinder metal fitting 12 at predetermined distance, the cylinder of these outer cylinder members 14 is provided. The main rubber elastic body 16 is interposed between the portion 20 and the inner cylinder fitting 12. In addition, the inner cylindrical metal fitting 12 has the cylindrical body portion 20 of the outer cylindrical member 14 in a direction opposite to the direction in which the power unit load is input (upward in FIG. 1) in a state where the engine mount 10 is mounted on the automobile. The power unit load is exerted between the inner cylindrical fitting 12 and the cylindrical portion 20 of the outer cylindrical member 14 when the engine mount 10 is mounted on the automobile. At this time, the inner cylinder fitting 12 and the cylinder part 20 of the outer cylinder member 14 are positioned substantially coaxially. Further, as described above, in a state where the engine mount 10 is mounted on an automobile, the inner cylinder fitting 12 is substantially eccentric with respect to the space between the inner cylinder fitting 12 and the cylindrical body portion 20 of the outer cylinder member 14. The main vibration load is input in the corresponding radial direction (vertical direction in FIG. 1).

  The main rubber elastic body 16 has a substantially thick cylindrical shape as a whole, and is formed in a state where the inner cylinder fitting 12 is vulcanized and bonded to the inner peripheral surface thereof. That is, here, the inner cylindrical metal member 12 and the main rubber elastic body 16 are configured as an integrally vulcanized molded product 26.

  As is apparent from FIGS. 3 and 4, the main rubber elastic body 16 constituting the integrally vulcanized molded product 26 has the inner cylinder fitting 12 in the main vibration load input direction (in the substantially eccentric direction of the inner cylinder fitting 12). A first cavity 28 and a second cavity 30 are formed symmetrically, which are located on both side portions sandwiched between the corresponding radial directions) and extend through the main rubber elastic body 16 in the axial direction. Yes. The first space 28 is substantially in the circumferential direction of the main rubber elastic body 16 on the eccentric direction of the inner cylinder fitting 12, that is, on the side where the separation distance between the inner cylinder fitting 12 and the cylinder portion 20 of the outer cylinder member 14 is small. It has a substantially arcuate shape that extends half the length. On the other hand, the second space 30 is formed in the direction opposite to the eccentric direction of the inner cylinder fitting 12, that is, on the side where the separation distance between the inner cylinder fitting 12 and the cylindrical body portion 20 of the outer cylinder member 14 increases. The upper base located on the metal fitting 12 side has a substantially trapezoidal shape that is shorter than the lower base located on the opposite side.

  Thus, here, as shown in FIGS. 1, 3, and 4, the inner peripheral portion of the main rubber elastic body 16 located between the first space 28 and the second space 30 is located. The first and second cavities 28 are connected to the outer peripheral surface of the inner cylinder fitting 12 by vulcanization and are connected to connect the inner cylinder fitting 12 and the cylindrical body portion 20 of the outer cylinder member 14. , 30 and the outer peripheral portion of the main rubber elastic body 16 constituting the outer wall portions are spaced apart from each other outward in the radial direction (perpendicular to the axis) around the inner cylindrical metal fitting 12, and on the entire outer peripheral surface. The cylindrical portion 34 is fixed to the inner peripheral surface of the cylindrical body portion 20 of the outer cylindrical member 14. Further, the two connecting portions 32 extend so as to incline in the direction opposite to the eccentric direction (downward in FIG. 3) from the inner cylinder fitting 12 side toward the cylinder part 20 side of the outer cylinder member 14. It is made into the substantially cross-section reverse V shape which consists of. Thereby, when the vibration load is input to the engine mount 10, the connecting portion 32 can be elastically deformed in the shear direction in the first and second cavities 28 and 30, and the radial direction of the main rubber elastic body 16 ( The spring characteristics in the direction perpendicular to the axis are softened.

  As shown in FIGS. 1 and 2, in the present embodiment, in particular, the inside of the first space 28 and the second space of the main rubber elastic body 16 having the above-described structure and being symmetrically positioned. The first stopper portion 36 and the second stopper portion 38 for restricting the elastic deformation of the connecting portion 32 are respectively provided with special structures in the place 30.

  That is, here, as is apparent from FIGS. 3 and 4, two portions on the circumference located symmetrically of the cylindrical portion 34 of the main rubber elastic body 16, specifically, the eccentric direction of the inner cylindrical metal member 12. In the radial direction corresponding to, two opposing portions of the cylindrical portion 34 that are opposed to each other with the portion surrounding the inner cylindrical metal fitting 12 of the connecting portion 32 of the main rubber elastic body 16 inflated are thickened. The first thick portion 40 and the second thick portion 42 that are made thicker are formed. The first thick portion 40 has a first through hole 44, and the second thick portion 42 has a second through hole 46 in the thickness direction. It penetrates and is formed. The first and second through holes 44 and 46 have a width that is smaller than the circumferential length of each thick portion 40 and 42 by a predetermined dimension, and a smaller than the axial length of each thick portion 40 and 42 by a predetermined dimension. It has a rectangular shape having a length. Thus, here, the first space 28 communicates with the outside through the first through hole 44 and the second space 30 through the second through hole 46.

  Further, a portion of each inner peripheral surface of the first and second through holes 44 and 46 that is offset toward the axial center side (inner cylinder fitting 12 side) of the cylindrical portion 34 has a rectangular cross section and protrudes at a predetermined height. In addition, engaging protrusions 48 that extend continuously in the circumferential direction over the entire circumference are integrally formed.

  In the present embodiment, as shown in FIGS. 1 and 2, the first stopper made of the same rubber material as that of the main rubber elastic body 16 with respect to the first through hole 44 and the second through hole 46. The part forming member 50 and the second stopper part forming member 52 are respectively fitted.

  As is apparent from FIGS. 1, 2, and 5, the first stopper portion forming member 50 has a long thick plate shape or block shape having a substantially home-base pentagonal cross section as a whole. . And the one side part of the thickness thru | or height direction (up-down direction in FIG. 2) is made into the 1st fitting part 54 of a substantially thick rectangular plate shape, On the other hand, the other side part takes The first stopper portion 36 has a substantially triangular prism shape that protrudes integrally from the first fitting portion 54 at a predetermined height and is gradually narrowed toward the tip.

  Further, in such a first stopper portion forming member 50, the end surface on the first fitting portion 54 side (the upper side in FIG. 5) has the same diameter as the outer peripheral surface of the cylindrical portion 34 of the main rubber elastic body 16. Further, a rectangular engagement groove 56 is formed so as to continuously extend over the entire circumference with respect to the outer peripheral surface composed of four side surfaces adjacent to the end surface that is the circular arc surface. Has been. The engagement groove 56 has a depth and a width that can be engaged with an engagement protrusion 48 that protrudes from the inner peripheral surface of the first through hole 44 of the cylindrical portion 34 of the main rubber elastic body 16. It is said to be a big size.

Then, in the first stopper portion forming member 50, the thickness of the first fitting portion 54 (dimension indicated by Ts ₁ in FIG. 5), the first thick in the cylindrical portion 34 of the main rubber elastic body 16 The thickness is substantially the same as the thickness of the portion 40 (the dimension indicated by Tg _{1 in} FIG. 3), and the maximum protrusion height of the first stopper portion 36 from the first fitting portion 54 (in FIG. 5). The dimension indicated by Hs ₁ ) is the minimum distance between the first thick portion 40 and the connecting portion 32 portion facing the first thick portion 40 across the first space 28 (see FIG. 3). The dimension is smaller by a predetermined dimension than the dimension indicated by Hg ₁ .

  On the other hand, as is apparent from FIGS. 1, 2 and 6, the second stopper portion forming member 52 as a whole also takes the form of a long thick plate or block having a substantially home-base pentagonal cross section. The one side portion in the thickness or height direction (vertical direction in FIG. 2) is a second fitting portion 58 having a substantially thick rectangular plate shape, while the other side portion is the first portion. The second stopper portion 38 has a substantially triangular prism shape that integrally protrudes from the two fitting portions 58 at a predetermined height and is gradually narrowed toward the tip.

  Further, even in the second stopper portion forming member 52, the end surface on the second fitting portion 58 side (the upper side in FIG. 5) is the main rubber elastic body 16, as in the first stopper portion forming member 50. A circular arc surface having the same diameter as the outer peripheral surface of the cylindrical portion 34, and the engaging protrusion 48 enters the outer peripheral surface so that a rectangular engaging groove 56 that can be engaged is formed. It is formed to extend continuously around the entire circumference.

Further, in the second stopper portion forming member 52, the thickness of the second fitting portion 54 (the dimension indicated by Ts _{2 in} FIG. 5) is the second thick wall in the cylindrical portion 34 of the main rubber elastic body 16. The thickness is approximately the same as the thickness of the portion 42 (the dimension indicated by Tg _{2 in} FIG. 3), and the maximum protrusion height of the second stopper portion 38 from the second fitting portion 58 (in FIG. 5). (The dimension indicated by Hs ₂ ) is the minimum distance between the second thick part 42 and the connecting part 32 portion facing the second thick part 42 across the second space 30 (see FIG. 3). The dimension is smaller than the dimension indicated by Hg _{2 by a} predetermined dimension.

  As shown in FIGS. 1 and 2, the first stopper portion forming member 50 has a first cylindrical portion 34 of the main rubber elastic body 16 fixed to the inner peripheral surface of the cylindrical portion 20 of the outer cylindrical member 14. The first stopper portion 36 is fitted into the first through hole 44 in the first fitting portion 54 with the first stopper portion 36 protruding into the first space 28 through the one through hole 44. Further, the second stopper portion forming member 52 is also fitted in the second fitting state with the second stopper portion 38 protruding into the second space 30 through the second through hole 46 of the cylindrical portion 34 of the main rubber elastic body 16. The joint 58 is fitted into the second through hole 46. Further, in such a fitted state, the first through hole 44 and the second through hole 46 are provided on the inner peripheral surfaces in the engagement grooves 56 provided in the stopper part forming members 50 and 52, respectively. The engaging ridges 48 are respectively inserted, and the engaging ridges 48 and the engaging grooves 56 are engaged with each other.

As a result, the first stopper portion 36 and the second stopper portion 38 are vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal member 12 in each of the first space 28 and the second space 30. The stoppers 36 are positioned so as to face each other with a distance corresponding to the height of protrusions Hs ₁ and Hs ₂ from the fitting parts 54 and 58 of the stoppers 36. Further, as will be described later, when the engine mount 10 is manufactured, the main rubber elastic body 16 (integrated addition) before the first and second stopper forming members 50 and 52 are fixed to the cylindrical body portion 20 of the outer cylindrical member 14. The first and second stopper portion forming members 50 and 52 (first and second fitting portions 54 and 58) when fitted into the first and second through holes 44 and 46 of the sulfur molded product 26), respectively. However, the first and second stopper portion forming members 50 and 52 (first and second fitting portions 54 and 58 are prevented from being easily detached from the first and second through holes 44 and 46. ) Is well maintained in the first and second through holes 44 and 46. As is apparent from this, in the present embodiment, the engagement protrusion 48 and the engagement groove 56 constitute an engagement mechanism.

  And the 1st stopper formation member 50 and the 2nd stopper part formation member 52 which were fitted by the 1st and 2nd through-holes 44 and 46 in that way are the 1st fitting part 54 and the 2nd fitting part. 58 is fixed to the inner peripheral surface of the cylindrical body portion 20 of the outer cylindrical member 14 on the entire surface of each end surface which is an arc surface.

Thus, in the present embodiment, the first stopper portion 36 and the second stopper portion 38 are respectively located from the cylindrical body portion 20 side of the outer cylindrical member 14 inside the first cavity 28 and the second cavity 30. Projection heights from the fitting portions 54 and 58 of the stopper portions 36 and 38 in the radial direction corresponding to the input direction of the main vibration load toward the inner cylinder fitting 12 side: the same height as Hs ₁ and Hs ₂ Protruding and provided.

  As a result, in the engine mount 10 of the present embodiment, the cylindrical portion 20 of the outer cylindrical member 14 and the inner cylindrical fitting 12 in the radial direction (axially perpendicular direction) corresponding to the input direction of the main vibration load. The relative displacement amount is regulated by the contact between the connecting portion 32 portion vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal member 12 and the first and second stopper portions 36 and 38, so that the outer cylindrical member 14 Excessive displacement can be prevented from occurring between the body and the power unit (both not shown) respectively attached to the inner cylinder fitting 12.

Further, here, the stopper clearance in the first space 28 is the first space 28 among the stopper clearances that are the amount of restriction of the relative displacement between the cylindrical body portion 20 of the outer tube member 14 and the inner tube metal 12. The protrusion height: Hs ₁ from the first fitting portion 54 of the first stopper portion 36 is subtracted from the minimum distance: Hg ₁ between the first thick portion 40 and the coupling portion 32 facing each other with a gap therebetween. On the other hand, the stopper clearance in the second space 30 is set to the size, and the minimum distance between the second thick portion 42 and the connecting portion 32 facing each other across the second space 30 is Hg _2. from the protruding height from the second fitting portion 58 of the second stopper portion 38: is set to a size obtained by subtracting the Hs _2.

  By the way, when manufacturing the engine mount 10 of the present embodiment having such a structure, for example, the operation is performed according to the following procedure.

  That is, first, an integrally vulcanized molded product 26 having a structure as shown in FIGS. 3 and 4 is formed and prepared. The integral vulcanization molded product 26 can be easily obtained by using, for example, a predetermined rubber material constituting the main rubber elastic body 16 and performing known injection molding using the inner cylinder fitting 12 as an insert product. To be molded.

  Separately, the first stopper part forming member 50 and the second stopper part forming member 52 having the structure shown in FIGS. 5 and 6 are respectively prepared by molding. For molding the first and second stopper portion forming members 50 and 52, for example, known injection molding or the like is performed.

  Next, as shown in FIGS. 7A and 7B, the first through hole 44 and the second through hole 46 of the main rubber elastic body 16 in the integrally vulcanized molded product 26 prepared as described above. The first stopper part forming member 50 and the second stopper part forming member 52 are fitted together. As a result, the first stopper portion 36 and the second stopper portion 38 are inserted into the first space 28 and the second space 30 through the through holes 44 and 46, respectively. An assembled body 59 is formed by assembling the second stopper portion forming members 50 and 52 to the integrally vulcanized molded product 26.

  As described above, the first and second stopper portion forming members 50 and 52 are provided on the outer peripheral surfaces of the stopper portion forming members 50 and 52 in the fitted state with the first and second through holes 44 and 46. Engagement ridges 48 provided on the inner peripheral surfaces of the first and second through holes 44 and 46 are engaged with the formed engagement grooves 56, and the fitting state is maintained well. Therefore, the assembled state of the first and second stopper part forming members 50 and 52 and the integrally vulcanized molded product 26 is not easily eliminated.

Further, at the same time as the assembly 59 is formed as described above, the protruding height of the first stopper portion 36 from the first fitting portion 54: Hs ₁ and the second fitting portion of the second stopper portion 38. Based on the protrusion height from 58: Hs ₂ , the respective sizes of the stopper clearances in the first space 28 and the second space 30 are set.

  Next, an adhesion processing operation is performed on the entire outer peripheral surface of the assembly 59 thus formed. Here, as such an adhesion treatment work, the entire outer peripheral surface of the cylindrical portion 34 of the integrally vulcanized molded product 26 (main rubber elastic body 16) and the first and second stopper portions forming members 50 and 52 are first and second. The operation of applying a known adhesive to the entire end surfaces of the two fitting portions 54 and 58 is performed at once in one operation.

  After that, as shown in FIG. 8A, a cylindrical body among the molding cavities 62 having an inner surface shape corresponding to the outer surface shape of the outer cylinder member 14 and formed in a known injection mold 60. The entire assembly 59 is set inside the portion where the portion 20 is formed, while two mounting sleeves 24 and 24 prepared separately are set on the portion where the mounting plate portion 22 (see FIG. 1) is formed. At this time, in the first vacant space 28 and the second vacant space 30 of the integrally vulcanized molded product 26 (main rubber elastic body 16) in the assembly 59, these cavities 28 and 30 correspond to each other. Each of the core molds 63 having a shape is accommodated.

  Subsequently, as shown in FIG. 8B, the molten resin material 64 is injected and filled into the molding cavity 62 in which the assembly 59 and the two mounting sleeves 24, 24 are set. Thereafter, the molten resin material 64 is cooled and solidified in the molding cavity 62 to mold the outer cylinder member 14, and on the inner peripheral surface of the cylindrical body portion 20 of the outer cylinder member 14, The outer peripheral surface (the entire outer peripheral surface of the cylindrical portion 34 and the entire end surfaces of the first and second fitting portions 54 and 58 in the first and second stopper portion forming members 50 and 52) are fixed. As a result, the target engine mount 10 having the structure shown in FIGS. 1 and 2 is obtained. Thereafter, the engine mount 10 is released from the injection mold 60 and used.

As described above, in the engine mount 10 of the present embodiment, the first and second vulcanized molded products 26 composed of the main rubber elastic body 16 and the inner tubular fitting 12 and the first and second stopper portions 36 and 38 are provided. The second stopper portion forming members 50 and 52 are constituted by independent members that are separate from each other, and when the integrated vulcanized molded product 26 and the first and second stopper portion forming members 50 and 52 are assembled, The stopper clearances in the first and second cavities 28 and 30 are the protruding heights of the first and second stopper portions 36 and 38 in the first and second stopper portion forming members 50 and 52, respectively: Hs ₁ and Hs. Each is set based on ₂ .

Therefore, in the engine mount 10, the first and second stopper portions 36 and 38 of the first and second stopper portion forming members 50 and 52 that are formed separately from the integrally vulcanized molded product 26 are simply used. The height of the protrusion: The stopper clearance can be easily changed to an arbitrary size simply by changing Hs ₁ , Hs ₂ , and, for example, an integral body made of an inner tube fitting and a main rubber elastic body Unlike the conventional apparatus in which each cavity is formed at the time of vulcanization molding by mold molding of the vulcanized molded product, the strength of the mold used for molding the integrally vulcanized molded product 26 is improved. It is possible to make the size of the stopper clearance sufficiently small or zero without causing a decrease. As a result, the spring characteristics of the main rubber elastic body 16 in the radial direction (perpendicular to the axis), the amount of regulation of the relative displacement in the radial direction of the outer cylinder member 14 and the inner cylinder fitting 12, etc. are in a wider range. It can be easily tuned, so that the necessary anti-vibration characteristics and the stopper effect can be ensured extremely advantageously.

Further, as described above, in the engine mount 10 of the present embodiment, the first and second stopper portions 36 of the first and second stopper portion forming members 50 and 52 made of a member different from the integrally vulcanized molded product 26 are used. 38, the height of the stopper clearance can be changed to an arbitrary size simply by changing the height Hs ₁ , Hs ₂ . Therefore, for example, several common single-type vulcanized molded products 26 are manufactured, and the protrusion heights Hs ₁ and Hs _{2 of} the first stopper portion 36 and the second stopper portion 38 are mutually equal. By manufacturing a plurality of different types of the first stopper portion forming member 50 and the second stopper portion forming member 52, it is possible to easily cope with the manufacture of a plurality of types of engine mounts 10 having different stopper clearance sizes. Is possible.

  Therefore, according to the structure of the engine mount 10 of the present embodiment, the size of the stopper clearance is different from the structure of the conventional device in which the stopper portion is integrally formed with the main rubber elastic body. In order to cope with the manufacture of a plurality of types of engine mounts, a single type of main rubber elastic body 16 (integrated vulcanized molded product 26) that is made common is manufactured, while the protrusions of the stopper portions 36 and 38 have various protrusion heights. A plurality of different types of stopper part forming members 50 and 52 are manufactured, so that a large number of integrally vulcanized molded parts of the main rubber elastic body and the inner cylindrical metal fittings, which are integrally formed with stopper parts of various heights, are manufactured. The need can be advantageously eliminated. As a result, when manufacturing a plurality of types of engine mounts having different sizes of stopper clearances, it is only necessary to manufacture a plurality of types of stopper portion forming members 50 and 52. For this reason, the molding die can be downsized. This makes it possible to advantageously reduce the production cost of the mold. Further, since the stopper portion forming members 50 and 52 themselves are small, it is possible to increase the number of products to be produced, and the production efficiency can be improved. Accordingly, the manufacturing cost of each engine mount 10 when manufacturing a plurality of types of engine mounts 10 having different stopper clearance sizes, that is, a plurality of types of engine mounts 10 having different anti-vibration characteristics and stopper effects, is required. It can be advantageously kept low and an improvement in productivity can also be realized advantageously.

  Further, in the engine mount 10 according to the present embodiment, during the production thereof, the adhesion treatment work for the integrally vulcanized molded product 26 and the first and second stopper portion forming members 50 and 52 made of separate members is performed. Then, the integrated vulcanized molded product 26 and the first and second stopper portion forming members 50 and 52 are assembled all at once in one operation on the entire outer peripheral surface of the assembly 59. In addition, the work of setting the integrally vulcanized molded product 26 and the first and second stopper portion forming members 50 and 52 in the molding cavity 62 for providing the outer cylinder member 14 is also one of setting the entire assembly 59. Done by work. Therefore, for example, each of the bonding treatment work of the integrally vulcanized molded product 26 and the first and second stopper portion forming members 50 and 52 and the setting work in the molding cavity are performed three times in one by one. Compared to a conventional apparatus that needs to be performed separately, the number of work steps during the production can be advantageously reduced, and the production work can be simplified. As a result, an improvement in productivity can be achieved extremely effectively.

  Further, in the engine mount 10, the first and second stopper portion forming members 50 and 52 are fitted to the first and second through holes 44 and 46 and assembled to the integrally vulcanized molded product 26. The engaging protrusions 48 provided on the inner peripheral surfaces of the through holes 44 and 46 are engaged with the engaging grooves 56 of the stopper portion forming members 50 and 52 to form the first and second stopper portions. The assembled state of the members 50 and 52 and the integrally vulcanized molded product 26 is not easily canceled. Therefore, the assembly work of the assembly 59 in the molding cavity 62 of the molding die 60 can be performed smoothly and easily. In addition, during such a setting operation, it is also advantageously prevented that the entry height and entry position of the first and second stopper portions 36, 38 into the first and second cavities 28, 30 are changed, Desired vibration isolation characteristics and a stopper effect can be ensured more advantageously and stably.

  In the present embodiment, the main rubber elastic body 16 has first and second two cavities 28 and 30 formed on both sides in the input direction of the main vibration load with the inner cylindrical fitting 12 interposed therebetween. In addition, since the first and second stopper portions 36 and 38 are provided in the voids 28 and 30, respectively, sufficient anti-vibration characteristics and an excellent stopper are provided when a main vibration load is input. The effect can be exerted more advantageously.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, the first space 28 and the second space 30 are provided symmetrically on both sides in the radial direction across the inner cylindrical fitting 12 of the main rubber elastic body 16. One or a plurality of such voids can be provided in the same structure as the conventional one, and the arrangement form is appropriately set. When a plurality of vacant spaces are provided, the size of each vacant space may be the same size or different from each other.

  In addition, in the case where a plurality of vacant spaces are provided, the stopper portion does not necessarily have to be provided in all the vacant spaces, and may have an appropriate size in some vacant spaces depending on the required stopper effect, etc. Will be provided.

  Furthermore, in the said embodiment, although the stopper part formation members 50 and 52 which have the stopper parts 36 and 38 were comprised using the rubber material same as the main body rubber elastic body 16, the stopper part formation members 50 and 52 are comprised. As a forming material, various elastic materials such as a rubber material, an elastomer material, or a resin material having elasticity, which are different from the main rubber elastic body 16, depending on the vibration isolation characteristics and the stopper effect required for the engine mount 10. Body material can be used. The first stopper portion forming member 50 and the second stopper portion forming member 52 may be formed of different types of elastic materials.

  Furthermore, the overall shape of the stopper portion forming members 50 and 52 and the shapes of the stopper portions 36 and 38 provided on them are not limited to the illustrated ones. Of course, the size and shape of the through holes 44 and 46 into which the stopper portion forming members 50 and 52 are fitted are also appropriately changed according to the shape and size of the stopper portion forming members 50 and 52.

  It goes without saying that any shape of the main rubber elastic body 16 provided in a conventionally known cylindrical vibration isolator can be adopted as the main rubber elastic body 16. Then, according to the shape of the main rubber elastic body 16, the positions of the voids and the through holes are appropriately determined.

  Furthermore, the size of the stopper clearance is also changed as appropriate according to the vibration isolating characteristics and the stopper effect required for the cylindrical vibration isolator. Therefore, for example, as shown in FIG. 9, the front end of the first stopper portion 36 in the first space 28 and the front end of the second stopper portion 38 in the second space 30 are connected to the first space 28. It is also possible to make the stopper clearance zero by contacting the connecting portion 32 sandwiched between the second space 30 and the second clearance 30. Thus, the cylindrical vibration isolator 66 having a stopper clearance of zero is preferably used as a vibration isolating bush or the like that is inserted into and attached to a torque rod mounting sleeve, for example. In addition, regarding the embodiment shown in FIG. 9, the same reference numerals as those in FIG. 1 and FIG. 2 are assigned to members and parts having the same configuration as that of the first embodiment shown in FIG. 1 and FIG. Therefore, the detailed description was omitted.

  Furthermore, the engagement mechanism formed between the outer peripheral surfaces of the fitting portions 54 and 58 of the stopper portion forming members 50 and 52 and the inner peripheral surfaces of the through holes 44 and 46 of the main rubber elastic body 16 is exemplified. In addition to the structure described above, the engagement groove 56 is provided on the inner peripheral surface of the through holes 44 and 46, while the engagement protrusion 48 is provided on the outer peripheral surface of the fitting portions 54 and 58, or other known publicly known structures. A structure can be adopted as appropriate.

  Further, the outer cylinder member is also made of a synthetic resin and is arranged around the shaft member so as to be spaced outward in the direction perpendicular to the axis and connected to the shaft member by a main rubber elastic body. The specific structure is not limited in any way, and for example, it may be configured by only the cylindrical body portion 20 as shown in FIG.

  In addition, the inner cylinder fitting 12 and the outer cylinder member 14 are eccentrically positioned as illustrated, and as shown in FIG. 9, in the form of being positioned coaxially, with the main rubber elastic body 16, Connected to each other.

  In addition, in the said embodiment, although the specific example of what applied this invention to the engine mount its manufacturing method of a motor vehicle, and the vibration-proof bushing of the connecting rod of a motor vehicle was shown, this invention is for various other vehicles or Of course, the present invention can be advantageously applied to a cylindrical vibration isolator other than for automobiles and a manufacturing method thereof.

  In addition, although not enumerated one by one, the present invention can be implemented in a mode to which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art. It goes without saying that any of the embodiments falls within the scope of the present invention without departing from the spirit of the present invention.

It is a cross-sectional explanatory drawing which shows one Embodiment of the cylindrical vibration isolator which has a structure according to this invention, Comprising: It is a figure equivalent to the II cross section of FIG. It is II-II sectional explanatory drawing in FIG. FIG. 3 is a cross-sectional explanatory view of an integrally vulcanized molded product included in the cylindrical vibration isolator shown in FIG. 1, corresponding to a III-III cross section of FIG. 4. It is IV-IV cross-sectional explanatory drawing in FIG. It is a perspective explanatory view of the first stopper part forming member attached to the cylindrical vibration isolator shown in FIG. It is a perspective explanatory view of the 2nd stopper part formation member attached to the cylindrical vibration proof device shown in FIG. It is a figure for demonstrating an example of the process of manufacturing the cylindrical vibration isolator shown in FIG. 1 according to this invention method, Comprising: (a) assemble | attaches two stopper part formation members to an integral vulcanization molded product. (B) has shown the state which assembled | attached the two stopper part formation members to the integral vulcanization molded product, and formed the assembly. It is a figure for demonstrating the process implemented following the process shown by FIG. 7, Comprising: (a) shows the state which set the assembly | attachment body in the shaping | molding cavity which gives an outer cylinder member, (b) ) Shows a state in which the molding cavity is filled with a molten resin. It is a figure corresponding to FIG. 1 which shows another example of the cylindrical vibration isolator which has a structure according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 Inner cylinder metal fitting 14 Outer cylinder member 16 Main body rubber elastic body 26 Integrated vulcanization molding 28 First cavity 30 Second cavity 32 Connection part 34 Tube part 36 First stopper part 38 Second stopper part 44 First One through hole 46 Second through hole 48 Engagement protrusion 50 First stopper part forming member 52 Second stopper part forming member 54 First fitting part 56 Engaging groove 58 Second stopper part forming member 62 Molding cavity 66 Vibration isolation apparatus

Claims (5)

A shaft member and an outer cylinder member made of synthetic resin, which is arranged around the shaft member and spaced outward in a direction perpendicular to the axis, are connected by a main rubber elastic body interposed therebetween. In addition, while providing a space extending through the main rubber elastic body in the axial direction, the elastic body protrudes in the direction perpendicular to the axis from the outer cylinder member side toward the shaft member side in the space. A cylindrical vibration isolator configured by providing a stopper portion made of a body material,
The main rubber elastic body integrally includes a cylindrical portion that is spaced apart from the axially perpendicular direction around the shaft member, and a connecting portion that connects the cylindrical portion and the shaft member. In addition, a cylindrical portion facing the connecting portion with the space in between is provided with a through hole, and the stopper portion is provided, and an independent stopper portion is formed separately from the main rubber elastic body. A member is fitted into the through-hole in a state in which the stopper portion protrudes into the space of the main rubber elastic body through the through hole of the cylindrical portion of the main rubber elastic body, and the main rubber is By assembling to the elastic body, an assembly composed of the stopper portion forming member and the main rubber elastic body is formed, and the assembly is formed on the entire outer peripheral surface of the outer cylinder member. By being fixed to the peripheral surface, the shaft member and the outer cylinder member The main body rubber elastic body, and the stopper portion forming member is fixed to the inner peripheral surface of the outer cylinder member, and the stopper portion is located in the space of the main body rubber elastic body. A cylindrical vibration isolator configured to protrude in a direction perpendicular to the axis from the outer cylinder member side toward the shaft member side.   The stopper part forming member integrally includes the stopper part and a fitting part fitted into the through hole of the cylindrical part of the main rubber elastic body, and an inner peripheral surface of the fitting part and the fitting part The cylindrical vibration isolator according to claim 1, wherein an engagement mechanism is provided between the outer peripheral surfaces of the through holes to engage with each other and maintain the fitted state between the fitting portion and the through hole. apparatus.   In the main rubber elastic body, a plurality of the spaces are provided with the shaft member interposed therebetween, and the through-holes are formed in a plurality of cylindrical portions facing the connecting portions with the plurality of spaces interposed therebetween. A plurality of stopper portion forming members, and the main body rubber elastic body in a state in which the stopper portions respectively provided in the holes are inserted into the cavities through the plurality of through holes. At the same time, by being fixed to the inner peripheral surface of the outer cylinder member, the plurality of stopper portions project in a direction perpendicular to the axis from the outer cylinder member side toward the shaft member side in the plurality of voids. The cylindrical vibration isolator according to claim 1 or 2, which is provided as described above.   The cylindrical vibration isolator according to any one of claims 1 to 3, wherein the stopper portion is positioned in contact with the connecting portion in the space. A shaft member and an outer cylinder member made of synthetic resin, which is arranged around the shaft member and spaced outward in a direction perpendicular to the axis, are connected by a main rubber elastic body interposed therebetween. In addition, while providing a space extending through the main rubber elastic body in the axial direction, the elastic body protrudes in the direction perpendicular to the axis from the outer cylinder member side toward the shaft member side in the space. A manufacturing method of a cylindrical vibration isolator configured by providing a stopper portion made of a body material,
Around the shaft member, a cylindrical portion spaced apart outward in a direction perpendicular to the axis, and a connecting portion that is vulcanized and bonded to the outer peripheral surface of the shaft member to connect the cylindrical portion and the shaft member A step of preparing an integrally vulcanized molded article having a through-hole in a cylindrical portion facing the connecting portion with the void interposed therebetween, with respect to the main rubber elastic body having integrally therewith,
Preparing the stopper part forming member independent of the main rubber elastic body, having the stopper part;
In the state where the stopper portion of the stopper portion forming member is inserted into the void of the integrally vulcanized molded product through the through hole provided in the cylindrical portion of the integrally vulcanized molded product, the stopper is formed. A step of forming an assembly composed of the stopper portion forming member and the integrally vulcanized molded product by fitting a member into the through-hole and assembling the integral vulcanized molded product;
A part of the cavity surface is composed of the entire outer peripheral surface of the assembly, the molding cavity giving the outer cylindrical member is filled with molten resin, solidified, and the outer cylindrical member is placed on the inner peripheral surface thereof. The shaft member and the outer cylinder member are connected by the main rubber elastic body by molding in a state where the entire outer peripheral surface of the assembly is fixed, and the stopper portion forming member is connected to the outer cylinder. Fixing the inner peripheral surface of the member, and providing the stopper portion in the space of the main rubber elastic body so as to protrude in a direction perpendicular to the axis from the outer cylindrical member side toward the shaft member side; ,
The manufacturing method of the cylindrical vibration isolator characterized by including.

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