JP6257389B2 - Cylindrical vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cylindrical vibration isolator suitably applied to a subframe mount, a suspension bush, and the like of an automobile and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a cylindrical vibration isolator is known as a type of anti-vibration coupling body or anti-vibration support body interposed between members constituting a vibration transmission system and mutually anti-vibrating and connecting these members. . In the cylindrical vibration isolator, an outer cylindrical member attached to the other member (attachment target member) constituting the vibration transmission system is extrapolated to an inner shaft member attached to one member constituting the vibration transmission system, The inner shaft member and the outer cylinder member have a structure in which they are elastically connected by a main rubber elastic body.

  By the way, recently, in order to meet a high demand for weight reduction of a vehicle, a cylindrical vibration isolator that can realize further weight reduction by making the outer cylinder member made of resin has been proposed. For example, what the applicant discloses in Japanese Patent Application Laid-Open No. 2009-79722 (Patent Document 1) is that.

  However, if the outer cylinder member made of resin is press-fitted and fixed to the mounting target member (cylindrical fixing member 2), the outer cylinder member may be damaged during the press-fitting, or the pulling force may be reduced due to a temperature change (the outer cylinder member is mounted). There is a possibility that the maximum resistance against the force of pulling out from the target member may be reduced, and there are cases where it is difficult to apply when the required removal force is large.

  In addition, in the Japanese Patent Application Laid-Open No. 2008-223920 (Patent Document 2), the applicant has a metal sleeve fitting externally fitted to a resin outer cylinder member, and the sleeve fitting is press-fitted and fixed to the mounting target member. Thus, a structure in which the outer cylinder member is fixed to the mounting target member is also proposed. According to this, since the sleeve metal fitting is press-fitted and fixed to the metal mounting target member, damage to the outer cylinder member due to press-fitting into the mounting target member, drop in the pull-out force due to temperature change, and the like hardly occur.

  However, even in the structure of Patent Document 2, when the resin outer cylinder member is press-fitted into the sleeve metal fitting, damage to the outer cylinder member may still be a problem. Further, in order to realize press-fitting of the outer cylinder member into the sleeve metal fitting and press-fitting into the mounting target member of the sleeve metal fitting, flange portions cannot be provided at both axial ends of the outer cylinder member. The stopper means for limiting the relative displacement amount of the outer cylinder member on both sides in the axial direction cannot be configured using the outer cylinder member.

JP 2009-79722 A JP 2008-223920 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution is to prevent damage to the outer cylinder member made of resin at the time of external fitting of the sleeve metal fitting or attachment to the attachment target member. In addition, a cylindrical vibration isolator having a novel structure capable of limiting the relative displacement between the inner shaft member and the outer cylinder member on both sides in the axial direction by a simple structure using the outer cylinder member, and a method for manufacturing the same. It is to provide.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

That is, according to the first aspect of the present invention, a resin-made outer cylinder member is extrapolated to the inner shaft member, and the inner shaft member and the outer cylinder member are elastically connected by the main rubber elastic body. In the cylindrical vibration isolator in which a sleeve fitting is externally fitted to a tubular member, and the outer tubular member is press-fitted and fixed to a mounting target member via the sleeve fitting, one end in the axial direction of the outer tubular member A first flange portion extending to the outer peripheral side is formed in the portion, and a second flange portion extending to the outer peripheral side is formed at the other axial end of the outer cylinder member, and the first flange portion is formed. A shock absorbing rubber is provided on each axial outer surface of the flange portion and the second flange portion to constitute an axial stopper means, while the sleeve fitting is externally attached to the outer cylindrical member from the second flange portion side. Inserted The sleeve is brought into contact with one flange portion in the axial direction, and the sleeve fitting is reduced in diameter so that the outer flange member is fitted between the first flange portion and the second flange portion in the axial direction. The outer diameter of the press-fitted portion of the sleeve fitting after the diameter reduction to the mounting target member is larger than the outer diameter of the second flange portion, while one end in the axial direction of the sleeve fitting The portion is formed with a support flange extending on the outer peripheral side, and the support flange is overlapped with the first flange portion of the outer cylinder member in the axial direction .

  According to the cylindrical vibration isolator having the structure according to the first aspect as described above, the first flange portion and the second flange portion are formed at both axial end portions of the outer cylinder member. An axial stopper means for limiting the relative displacement between the axial member and the outer cylinder member on both axial sides is configured. Therefore, excessive deformation of the main rubber elastic body is prevented, and durability is improved.

  Further, since the sleeve metal fitting is externally fitted to the resin outer cylinder member, and the outer cylinder member is press-fitted and fixed to the mounting target member via the sleeve metal fitting, a sufficient removal force can be obtained with a relatively small press-fitting allowance. Can be obtained. In addition, since the outer diameter of the press-fitted portion of the sleeve fitting is made larger than the outer diameter of the second flange portion, the second flange portion obstructs the press-fitting when the sleeve fitting is pressed into the mounting target member. Therefore, the outer cylinder member can be press-fitted without greatly deforming.

  Further, since the sleeve metal fitting that is press-fitted and fixed to the attachment target member is externally fitted to the outer cylinder member by being externally inserted into the outer cylinder member and reduced in diameter, the sleeve metal fitting is attached to the outer cylinder member. The outer cylinder member is prevented from being damaged as compared with the case where it is press-fitted to the cylinder member.

  Furthermore, the sleeve fitting can be externally inserted into the outer cylinder member from the second flange portion side, and can be brought into contact with the first flange portion in the axial direction. In this way, the outer diameter of the first flange portion and the outer diameter of the second flange portion are made different so that the first flange portion has a larger diameter than the second flange portion, so that the outer cylinder Without greatly deforming the member, the sleeve fitting is easily inserted over the outer cylinder member over the second flange portion, and the axial position of the sleeve fitting with respect to the outer cylinder member is determined by the first flange portion of the sleeve fitting. It is possible to set easily by contacting with.

In addition , according to this aspect, since the first flange portion having a larger diameter than the second flange portion is reinforced in a wide range by the support flange of the sleeve fitting, the first flange against the stopper load The substantial load bearing performance of the portion is improved, and durability is advantageously ensured.

According to a second aspect of the present invention , a resin outer cylinder member is extrapolated to an inner shaft member, the inner shaft member and the outer cylinder member are elastically connected by a main rubber elastic body, and the outer cylinder member In the cylindrical vibration isolator in which a sleeve metal fitting is externally fitted and the outer cylindrical member is press-fitted and fixed to a mounting target member via the sleeve metal fitting , at one end in the axial direction of the outer cylindrical member. Is formed with a first flange portion that extends to the outer peripheral side, and a second flange portion that extends to the outer peripheral side is formed at the other axial end of the outer cylinder member. Shock absorbers are provided on the respective axial outer surfaces of the second flange portion to constitute axial stopper means, while the sleeve fitting is externally inserted into the outer cylindrical member from the second flange portion side. The first hula The sleeve fitting is externally fitted between the first flange portion and the second flange portion of the outer cylinder member by reducing the diameter of the sleeve fitting. , the press fit portion to the mounting target member in said sleeve component of the reduced径後outer diameter, while being larger than the outer diameter of the second flange portion, said second flange portion is the first The sleeve portion is thicker in the axial direction than the flange portion, and the other end portion in the axial direction of the sleeve fitting is formed in a cylindrical shape extending in the axial direction, and the other end surface in the axial direction of the sleeve fitting is the second end portion. It is characterized by being overlapped with the flange portion of in the axial direction.

According to the cylindrical vibration isolator described in this aspect, in addition to the effects described in the above [0011] to [0014], the following effects can be exhibited. That is, according to the second aspect, since the second flange portion is thicker than the first flange portion, the deformation rigidity of the second flange portion is made higher than that of the first flange portion. The load bearing performance of the second flange portion itself against the stopper load is sufficiently ensured. Moreover, the load endurance of the second flange portion can be further improved by superimposing the other end surface in the axial direction of the sleeve fitting on the second flange portion.

  Furthermore, since the other end portion in the axial direction of the sleeve fitting is cylindrical, the sleeve fitting can be manufactured more easily and inexpensively.

According to a third aspect of the present invention, in the cylindrical vibration isolator described in the first or second aspect, the inner shaft member is formed with an outward protrusion that protrudes toward the outer cylindrical member. In addition, the outer cylindrical member is formed with an inward protruding portion that protrudes toward the inner shaft member.

According to the third aspect, the amount of elastic deformation in the radial direction of the main rubber elastic body is limited by the outer protrusion and the inner protrusion. When fitting and mounting, the amount of deformation of the outer cylindrical member is reduced, and damage to the outer cylindrical member is avoided.

Further, the fourth aspect of the present invention is a method for manufacturing a cylindrical vibration isolator, an inner preparation step for preparing an inner shaft member, and a first flange portion extending on the outer peripheral side at one end portion in the axial direction. And an outer preparation step of preparing a resin-made outer cylinder member provided with a second flange portion that extends to the outer peripheral side at the other end portion in the axial direction, and a main body rubber by extrapolating the outer cylinder member to the inner shaft member A vulcanization molding step for obtaining an integrally vulcanized molded product by elastic connection with an elastic body, and a sleeve fitting prepared in advance from the second flange portion side to the outer cylindrical member of the integral vulcanized molded product. A sleeve placement step of inserting and extrapolating until abutting against one flange portion, reducing the diameter of the sleeve fitting externally attached to the outer cylindrical member, and attaching the sleeve fitting to the first outer cylindrical member. Flange and second flange Together allowed to fitted in the axial direction between the outer diameter of the press fit portion of the mounting object member in said sleeve component of the reduced径後is, a sleeve fixing step that is larger than the outer diameter of the second flange portion, And a support flange that extends to the outer peripheral side is formed at one end of the sleeve fitting in the axial direction, and the support flange extends axially with the first flange portion of the outer cylindrical member. It is characterized by being superimposed .
A fifth aspect of the present invention is a method of manufacturing a cylindrical vibration isolator, comprising an inner preparation step of preparing an inner shaft member, and a first flange portion extending on the outer peripheral side at one end portion in the axial direction. And an outer preparatory step of preparing a resin-made outer tube member having a second flange portion extending to the outer peripheral side at the other end portion in the axial direction, and by inserting the outer tube member into the inner shaft member, the main rubber elastic body A vulcanization molding step of obtaining an integrally vulcanized molded product by elastically connecting the first vulcanized molded product and a sleeve fitting prepared in advance to the outer cylindrical member of the integrally vulcanized molded product from the second flange portion side. A sleeve arrangement step of inserting and extrapolating until the flange comes into contact with the flange, and reducing the diameter of the sleeve fitting extrapolated to the outer tubular member, and attaching the sleeve fitting to the outer tubular member of the first flange portion And shaft of the second flange portion And a sleeve fixing step in which the outer diameter of the press-fitting portion of the sleeve fitting after the diameter reduction to the mounting target member is made larger than the outer diameter of the second flange portion. In addition, the second flange portion is thicker in the axial direction than the first flange portion, and the other end portion in the axial direction of the sleeve metal fitting has a cylindrical shape extending in the axial direction. The other end face in the axial direction of the sleeve fitting is overlapped with the second flange portion in the axial direction.

According to the manufacturing method of the cylindrical vibration isolator according to the fourth or fifth aspect, the sleeve fitting extrapolated from the second flange portion side to the outer cylindrical member is formed into the outer cylindrical member by the diameter reduction processing. Since the outer fitting is externally fitted, it is possible to prevent the outer cylinder member from being greatly deformed and damaged when the sleeve fitting exceeds the second flange portion.

  Further, when the sleeve metal fitting is extrapolated from the second flange portion side to the outer cylindrical member, the sleeve metal fitting is inserted until the insertion end of the sleeve metal fitting comes into contact with the first flange portion. Positioning can be easily performed in the axial direction with respect to the cylindrical member, and the fixing operation of the sleeve fitting to the outer cylindrical member can be easily performed.

According to a sixth aspect of the present invention, in the method for manufacturing a cylindrical vibration isolator described in the fourth or fifth aspect, in the sleeve fixing step, the outer cylindrical member and the main rubber elastic body are connected to the sleeve fitting. In addition, the diameter is reduced.

  According to the sixth aspect, it is possible to reduce the radial tensile stress caused by the thermal shrinkage after the molding of the outer cylindrical member and the main rubber elastic body by the diameter reduction processing after the molding, and the durability is improved. Improvement is achieved. In addition, if the outer cylinder member and the main rubber elastic body are reduced in diameter together with the sleeve fitting, an increase in the number of manufacturing steps can be avoided.

  According to the present invention, the axial stopper means is configured using the first flange portion and the second flange portion provided at both axial end portions of the outer cylinder member, so that the inner shaft member and the outer cylinder member The relative displacement is limited on both sides in the axial direction, and damage due to excessive deformation of the main rubber elastic body is avoided. In addition, since the sleeve fitting press-fitted into the mounting target member is externally inserted into the outer cylinder member from the second flange portion side and reduced in diameter, the outer cylinder member is fitted and fixed to the outer cylinder member. The sleeve fitting can be attached to the outer cylinder member without greatly deforming the end portion of the outer cylinder member. Furthermore, the sleeve fitting is easily positioned at a predetermined position in the axial direction with respect to the outer cylindrical member by being extrapolated to the axial position where the sleeve fitting contacts the first flange portion with respect to the outer cylindrical member.

The front view which shows the member mount as 1st embodiment of this invention. II-II sectional drawing of FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. The figure explaining an example of the manufacturing process of the member mount shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-4, the member mount 10 for motor vehicles is shown as one Embodiment of this invention. The member mount 10 has a structure in which an outer cylinder member 14 is extrapolated to an inner shaft member 12, and the inner shaft member 12 and the outer cylinder member 14 are elastically connected by a main rubber elastic body 16.

  More specifically, the inner shaft member 12 has a thick, small-diameter, generally cylindrical shape, has an inner diameter dimension that is substantially constant, and an outer diameter dimension that is greater than the intermediate portion at both end portions in the axial direction. In addition, at both end portions of the inner shaft member 12 in the axial direction, thick portions 18 as outer projecting portions projecting outward are integrally formed over the entire circumference.

  Further, a stopper member 20 is attached to an intermediate portion in the axial direction of the inner shaft member 12 having a small diameter. The stopper member 20 is an annular member made of synthetic resin, and stopper protrusions 22 as outward protrusions protruding outward are formed on both sides in one radial direction. The stopper protrusion 22 has a lateral rolling mountain shape in which the protruding height gradually increases toward the center in the axial direction, and is an inner inclined surface 24 in which both side surfaces in the axial direction are inclined with respect to the direction perpendicular to the axis. The portions of the stopper member 20 that are out of the stopper protrusions 22 and 22 have a radial thickness smaller than the protruding height of the thick portion 18 of the inner shaft member 12, and the thick portions 18 and 18. Are accommodated in concave groove-like portions between the axial directions. The stopper member 20 is externally fitted to the inner shaft member 12 by being injection-molded on the outer peripheral surface of the inner shaft member 12.

  Further, the outer cylinder member 14 is formed of a synthetic resin and includes a cylindrical portion 26 that has a thin and large-diameter substantially cylindrical shape. Further, an inward protruding portion 28 that protrudes inward in the radial direction is integrally formed in an intermediate portion of the cylindrical portion 26 in the axial direction. The inward projections 28 are formed at two locations facing each other in one radial direction, and extend in a length that is less than a half circumference in the circumferential direction. Furthermore, one inward projection 28 is disposed at a position near one axial end of the cylindrical portion 26, and the other inner projection 28 is disposed at a position near the other axial end of the cylindrical portion 26. In addition, the axially inner surfaces of the inward projections 28 are formed as outer inclined surfaces 30 that are inclined with respect to the direction perpendicular to the axis.

Further, a first flange portion 32 that extends to the outer peripheral side is integrally formed at one axial end portion of the cylindrical portion 26 in the outer cylindrical member 14, and the other axial end portion of the cylindrical portion 26. A second flange portion 34 that extends to the outer peripheral side is integrally formed. The first flange portion 32 protrudes larger on the outer peripheral side than the second flange portion 34, and the outer diameter size (r ₁ ) of the first flange portion 32 is the outer diameter size of the second flange portion 34 ( larger than r ₂ ). Further, the second flange portion 34 is thicker in the axial direction than the first flange portion 32, and is preferably 1.5 times thicker than the first flange portion 32, more preferably. Is more than twice as thick.

  And the outer cylinder member 14 is extrapolated by the inner shaft member 12, and the inner shaft member 12 and the outer cylinder member 14 are elastically connected by the main rubber elastic body 16. The inner inclined surface 24 of each stopper protrusion 22 in the inner shaft member 12 and the outer inclined surface 30 of each inner protrusion 28 in the outer cylinder member 14 are arranged to face each other.

  The main rubber elastic body 16 has a thick, generally cylindrical shape as a whole, the inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner shaft member 12, and the outer peripheral surface is the inner cylinder member 14 inner surface. It is vulcanized and bonded to the peripheral surface. The main rubber elastic body 16 of the present embodiment is formed as an integrally vulcanized molded product 36 including the inner shaft member 12 and the outer cylindrical member 14.

  Further, a first buffer rubber 38 integrally formed with the main rubber elastic body 16 is fixed to the outer surface in the axial direction of the first flange portion 32 in the outer cylinder member 14. The first shock absorbing rubber 38 is continuously vulcanized and bonded to the first flange portion 32 over the entire circumference, and the shock absorbing portions 40 having partially increased protrusion heights are provided at a plurality of positions on the periphery. Is provided. On the other hand, a second buffer rubber 42 integrally formed with the main rubber elastic body 16 is fixed to the outer surface in the axial direction of the second flange portion 34 in the outer cylinder member 14. The second shock absorbing rubber 42 is continuously vulcanized and bonded to the second flange portion 34 over the entire circumference, and like the first shock absorbing rubber 38, the protruding height is partially increased. Buffer portions 44 are provided at a plurality of locations on the circumference.

  Furthermore, the main rubber elastic body 16 is formed with recesses 46 and 46 that open on one surface in the axial direction, and recesses 46 and 46 that open on the other surface in the axial direction. The recesses 46 are formed in the intermediate portion in the radial direction of the main rubber elastic body 16 and extend in the circumferential direction. Further, the recesses 46 and 46 opened on one surface in the axial direction are arranged at positions facing each other in the radial direction, and the recesses 46 and 46 opened on the other surface in the axial direction are axially arranged on the circumference. It is arranged at a position substantially corresponding to the recesses 46 opening on one surface.

  In addition, the inner shaft member 12 and the outer cylinder member 14 are formed of the main rubber between the recesses 46 and 46 opened on one surface in the axial direction and the recesses 46 and 46 opened on the other surface in the axial direction. The elastic body 16 is elastically connected. In the present embodiment, the distance between the opposing inner and outer inclined surfaces 24, 30 between the stopper protrusions 22, 22 of the stopper member 20 attached to the inner shaft member 12 and the inner protrusions 28, 28 of the outer cylinder member 14 is the same. The main rubber elastic body 16 is elastically connected so that the to-collect function is exhibited.

  Furthermore, a pair of slits 54 and 54 are formed in the main rubber elastic body 16. As shown in FIG. 3, the slits 54 penetrate the main rubber elastic body 16 in the axial direction. As shown in FIG. 1, the slits 54 extend in the circumferential direction with a length that is less than a half circumference, and mutually in the radial direction. It is arranged at each facing position.

  A sleeve fitting 56 is fitted on the outer cylindrical member 14 of the integrally vulcanized molded product 36 of the main rubber elastic body 16. The sleeve fitting 56 is a member formed of a metal such as iron or aluminum alloy, and includes a fitting cylinder portion 58 having a thin-walled and large-diameter substantially cylindrical shape. Furthermore, a support flange 60 that extends to the outer peripheral side is integrally formed over the entire circumference at one end of the sleeve fitting 56 in the axial direction of the fitting tube portion 58. Note that the other end in the axial direction of the fitting tube portion 58 in the sleeve metal fitting 56 has a substantially cylindrical shape extending in the axial direction with a substantially constant cross section.

  The sleeve metal fitting 56 is externally attached to the cylindrical portion 26 by a diameter reduction process such as an eight-way drawing, with the fitting cylindrical portion 58 being extrapolated from the second flange portion 34 side to the cylindrical portion 26 of the outer cylindrical member 14. It fits and is attached between the axial direction of the 1st flange part 32 and the 2nd flange part 34 in the outer cylinder member 14. Further, the support flange 60 of the sleeve fitting 56 is abutted and overlapped with the first flange portion 32 in the axial direction, and the other axial end surface of the fitting tube portion 58 in the sleeve fitting 56 is the second flange. The portion 34 is abutted and overlapped in the axial direction. In this embodiment, the thickness dimension of the fitting cylinder part 58 in the sleeve metal fitting 56 is substantially the same as the protruding height of the second flange part 34, and the other axial end face of the fitting cylinder part 58 is the second. Are overlapped with substantially the entire flange portion 34.

As shown in FIGS. 2 and 3, when the sleeve fitting 56 is attached to the outer cylinder member 14, the sleeve fitting 56 gradually expands toward the one axial end side in the axially intermediate portion of the fitting tube portion 58 of the sleeve fitting 56. A taper portion 62 having a diameter is formed, and one end side of the taper portion 62 is a press-fit portion 64 having a larger diameter than the other end side. The outer diameter dimension (R ₁ ) of the press-fit portion 64 in the sleeve fitting 56 is made larger than the outer diameter dimension (r ₂ ) of the second flange portion 34 in the outer cylinder member 14.

  In the member mount 10 having such a structure, the inner shaft member 12 is attached to a vehicle body (not shown) by a mounting bolt (not shown) through which the inner shaft member 12 is inserted, and the outer cylinder member 14 is connected via a sleeve metal fitting 56. Then, it is press-fitted into a mounting hole 68 provided in a suspension member 66 as a mounting target member. As a result, the member mount 10 is mounted on the vehicle, and the suspension member 66 is supported by the vehicle body in a vibration-proof manner. In the present embodiment, the outer peripheral surface of the press-fit portion 64 of the sleeve fitting 56 is pressed against the inner peripheral surface of the mounting hole 68 of the suspension member 66, while the tapered portion 62 of the sleeve fitting 56 and the other end in the axial direction than that. The side is separated from the inner peripheral surface of the mounting hole 68 toward the inner peripheral side.

  Further, in the vehicle mounting state, the first flange portion 32 provided at one end in the axial direction of the outer cylinder member 14 is disposed to face a vehicle body (not shown), and the first flange portion 32 and the vehicle body are arranged. Due to the contact through the first buffer rubber 38, the relative displacement amount of the suspension member 66 with respect to the vehicle body is limited on one side in the mount axis direction. Further, in the vehicle mounted state, a second flange portion 34 provided at the other axial end of the outer cylinder member 14 is disposed to face a vehicle body (not shown), and the second flange portion 34 and the vehicle body are arranged. The relative displacement amount of the suspension member 66 with respect to the vehicle body is limited on the other side in the mount axis direction by the contact through the second buffer rubber 42. Thus, the axial direction stopper means for limiting the relative displacement amount of the suspension member 66 with respect to the vehicle body, in other words, the relative displacement amount of the inner shaft member 12 and the outer cylinder member 14 on both sides in the mount axis direction is configured. In the present embodiment, the first and second flange portions 32 and 34 and the vehicle body come into contact with each other via the first and second cushion rubbers 38 and 42, so that the hitting sound at the time of contact is reduced. Is done.

  Furthermore, the main rubber elastic body 16 is compressed between the radial directions of the stopper protrusions 22 and 22 of the stopper member 20 fitted on the inner shaft member 12 and the inner peripheral surface of the outer cylinder member 14, A straight shaft stopper means is provided for limiting the relative displacement between the inner shaft member 12 and the outer cylinder member 14 on both sides in the radial direction (left and right direction in FIG. 2).

  The member mount 10 according to the present embodiment having such a structure is manufactured by the following process, for example.

  That is, the inner shaft member 12 is formed by forming a metal such as iron or aluminum alloy into a predetermined shape by casting (including die-casting) or extrusion. Thus, the inner preparation process is completed.

  Further, the outer cylinder member 14 including the first flange portion 32 and the second flange portion 34 is formed at both axial ends of the cylindrical portion 26 by molding the synthetic resin into a predetermined shape by injection molding or the like. . Thus, the outer preparation process is completed.

  Next, the prepared inner shaft member 12 and the outer cylinder member 14 are set in a mold (not shown), the inner shaft member 12 and the outer cylinder member 14 are placed inside and outside, and the mold cavity is filled with a rubber material. Thus, the main rubber elastic body 16 is vulcanized and molded. As a result, an integrally vulcanized molded product 36 of the main rubber elastic body 16 including the inner shaft member 12 and the outer cylinder member 14 is formed. Thus, the vulcanization molding process is completed.

  Next, as shown in FIG. 5 (a), a sleeve fitting 56 prepared in advance is attached to the second flange portion 34 of the outer cylindrical member 14 with respect to the integrally vulcanized molded product 36 of the main rubber elastic body 16. As shown in FIG. 5 (b), the sleeve fitting 56 is extrapolated to the outer cylinder member 14 of the integrally vulcanized molded product 36 from the side as shown in FIG. 5 (b). Thus, the sleeve placement process is completed.

Here, before the diameter reduction processing of the sleeve fitting 56 described later, the inner diameter dimension (R ₂ ) of the sleeve fitting 56 is larger than the outer diameter dimension (r ₂ ′) of the second flange portion 34 of the outer cylindrical member 14. Thus, the sleeve fitting 56 can be externally inserted into the outer cylinder member 14 with a gap. Further, by inserting the outer cylinder member 14 into the sleeve metal fitting 56 until the support flange 60 provided at one axial end of the sleeve metal fitting 56 abuts the first flange portion 32 of the outer cylinder member 14 in the axial direction. The sleeve fitting 56 can be extrapolated at a predetermined position in the axial direction with respect to the outer cylindrical member 14. As is clear from this, the inner diameter dimension (R ₂ ) of the sleeve fitting 56 is smaller than the outer diameter dimension (r ₁ ′) of the first flange portion 32 before the diameter reduction processing of the sleeve fitting 56. It has been made smaller.

  Next, as shown in FIG. 5C, the sleeve metal fitting 56 extrapolated to the outer cylindrical member 14 is subjected to diameter reduction processing (drawing) such as an eight-way drawing by a jig 70. The 56 fitting tube portions 58 are externally fixed to the tubular portion 26 of the outer tube member 14. In the present embodiment, the taper portion 62 is formed in the fitting cylinder portion 58 by reducing the diameter of the other end in the axial direction of the fitting tube portion 58 having a cylindrical shape larger than that of the one end side. A press-fit portion 64 is formed on one side in the axial direction from 62. Further, in the present embodiment, the outer cylinder member 14 and the main rubber elastic body 16 are reduced in diameter by pre-compressing in the radial direction by reducing the diameter of the outer cylinder member 14 together with the sleeve fitting 56. Thus, the sleeve fixing process is completed, and the manufacturing process of the member mount 10 is completed.

  In the present embodiment, the entire sleeve fitting 56 is drawn. However, the sleeve fitting 56 does not have to be reduced in diameter, and can be externally fitted to the outer cylindrical member 14 by partial reduction in diameter, for example. . Specifically, a tapered portion is formed in the cylindrical portion 26 when the outer cylindrical member 14 is molded, and the upper portion of the tapered portion is made smaller in diameter than the lower portion, and the second flange portion 34 of the outer cylindrical member 14 is formed. If the outer diameter dimension and the outer diameter dimension of the lower portion of the tubular portion 26 are substantially the same, the upper portion of the sleeve fitting 56 above the tapered portion 62 of the fitting tubular portion 58 is drawn to form the tubular portion 26. The member mount having the same shape as that of the present embodiment can be formed by being fitted on the upper portion.

  Further, the outer cylinder member 14 and the main rubber elastic body 16 need not be pre-compressed by reducing the diameter simultaneously with the drawing of the sleeve fitting 56. For example, before the sleeve fitting 56 is attached to the outer cylinder member 14, It is also possible to pre-compress the outer cylinder member 14 and the main rubber elastic body 16 by drawing the outer cylinder member 14 in a separate process. When the sleeve fitting 56 is partially drawn, the outer cylindrical member 14 and the main rubber elastic body 16 may be partially precompressed together with the sleeve fitting 56.

  According to the member mount 10 having the structure according to the present embodiment thus obtained, the sleeve metal fitting 56 is externally fitted to the resin outer cylinder member 14, and the fitting cylinder portion 58 of the sleeve metal fitting 56 is used as the member mount 10. Therefore, it is possible to obtain a sufficiently large removal force with a small press-fitting allowance. Therefore, the deformation amount of the outer cylinder member 14 due to the press-fitting into the mounting hole 68 is suppressed, and the outer cylinder member 14 is prevented from being cracked.

  Further, since the sleeve metal fitting 56 is externally attached to the outer cylinder member 14 by being reduced in diameter and then fitted and fixed, the outer cylinder member 14 is moved to the inner peripheral side when the sleeve metal fitting 56 is attached. It can also be prevented from being pushed and damaged. In addition, since the outer cylindrical member 14 and the main rubber elastic body 16 are pre-compressed in the radial direction by the diameter reduction processing of the sleeve fitting 56, the outer cylindrical member 14 and the main rubber elastic body 16 are subjected to heat shrinkage after molding. The resulting tensile stress is reduced, and durability is improved.

In particular, in the outer cylindrical member 14 provided with the first and second flange portions 32 and 34 at both ends of the cylindrical portion 26, the outer diameter dimension (r ₂ ′) of the second flange portion 34 is the first flange. The outer diameter dimension (r ₁ ′) of the portion 32 is made smaller, and the sleeve fitting 56 is externally inserted into the outer cylindrical member 14 from the second flange portion 34 side having a smaller outer diameter dimension. Therefore, the sleeve fitting 56 can be inserted and mounted between the first flange portion 32 and the second flange portion 34 without significantly increasing the inner diameter of the sleeve fitting 56.

  In addition, since the first flange portion 32 is provided at one axial end of the outer cylinder member 14, the first flange portion 32 contacts the vehicle body side via the first buffer rubber 38. By contacting, the relative displacement amount of the suspension member 66 with respect to the vehicle body is limited on one side of the outer cylinder member 14 in the axial direction. On the other hand, since the second flange portion 34 is provided at the other end portion in the axial direction of the outer cylinder member 14, the second flange portion 34 contacts the vehicle body side via the second cushion rubber 42. By contacting, the relative displacement amount of the suspension member 66 with respect to the vehicle body is limited on the other axial side of the outer cylinder member 14. Thus, since the outer cylinder member 14 is a structure provided with the 1st, 2nd flange parts 32 and 34 in the axial direction both ends, the relative displacement amount of the inner shaft member 12 and the outer cylinder member 14 is the following. It is restricted on both sides in the axial direction, and damage due to excessive deformation of the main rubber elastic body 16 is prevented.

  Further, the sleeve fitting 56 that is externally inserted into the outer cylinder member 14 includes a support flange 60 at one end in the axial direction, and the support flange 60 contacts the first flange portion 32 of the outer cylinder member 14 from the inside in the axial direction. Overlapped in state. As a result, the first flange portion 32 that is thinner in the axial direction and larger in outer diameter than the second flange portion 34 is reinforced in a wide area by the support flange 60, so that the stopper contact area has a sufficient resistance. A large load can be secured.

  Further, the other end portion in the axial direction of the sleeve fitting 56 is formed in a substantially cylindrical shape having no flange. However, the second flange portion 34 of the outer cylinder member 14 has a shaft that is more than the first flange portion 32. Since it is thick in the direction, sufficient durability is ensured even in the second flange portion 34 having a small reinforcing area due to the contact of the sleeve fitting 56. In addition, the sleeve metal fitting 56 provided with the support flange 60 only at one end can be manufactured more easily and at a lower cost than that provided with the flange at both ends.

  Further, an outer protrusion formed of a thick wall portion 18 and a stopper protrusion 22 is formed on the outer peripheral surface of the inner shaft member 12, and an inner protrusion is formed on the inner peripheral surface of the outer cylinder member 14. A portion 28 is formed. Therefore, as compared with the case where the outer peripheral surface of the inner shaft member 12 and the inner peripheral surface of the outer cylindrical member 14 have a straight cylindrical shape extending in the axial direction, the main rubber elastic body against pre-compression in the radial direction The deformation amount of 16 is limited, and damage due to excessive drawing of the outer cylinder member 14 is advantageously avoided.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the protrusion height of the second flange portion 34 is set so that the stopper abutting area is set large, and the reinforcement by the sleeve metal fitting 56 is effectively obtained throughout the fitting tube portion 58 of the sleeve metal fitting 56. Although it is desirable that the thickness is substantially the same as the thickness of the other axial end, the dimensions may be different from each other. In particular, when the thickness dimension of the other end in the axial direction of the fitting tube portion 58 is larger than the protruding height of the second flange portion 34, the entire fitting tube portion 58 is substantially constant without the taper portion 62. It is also possible to form the press-fit portion 64 that is formed with an outer diameter dimension and protrudes to the outer peripheral side of the second flange portion 34 as a whole.

  Further, the first and second buffer rubbers 38 and 42 provided on the outer surfaces in the axial direction of the first and second flange portions 32 and 34 are not necessarily fixed to the first and second flange portions 32 and 34. May be. For example, the first and second shock-absorbing rubbers are fixed to other members (such as a vehicle body) attached to the inner shaft member 12 side, and between the first and second flange portions 32 and 34 and the vehicle body. By being arranged, it can also be made to contact | abut to the axial direction outer surface of the 1st, 2nd flange parts 32 and 34. FIG.

  In addition, the specific shape of the main rubber elastic body is not particularly limited, and for example, the shape, arrangement, number, etc. of the recesses and slits are appropriately changed according to the required spring characteristics. . Furthermore, in the above-described embodiment, a to-collect function is imparted by the outward projections (the thick portion 18 and the stopper projections 22 and 22) of the inner shaft member 12 and the inward projection 28 of the outer cylinder member 14. However, the present invention can be suitably applied to a general cylindrical vibration isolator having no to-collect function. As is clear from this, neither the outer protrusion of the inner shaft member 12 nor the inner protrusion 28 of the outer cylinder member 14 is essential, and both the outer protrusion and the inner protrusion are both required. There may not be any, and only one of them may be provided.

  The application range of the present invention is not necessarily limited to the member mount. For example, the present invention can be suitably applied to a cylindrical vibration isolator used for an engine mount, a suspension bush, or the like. Further, the present invention is not only applied to a tubular vibration isolator for automobiles, but also suitably applied to a cylindrical vibration isolator used for, for example, a motorcycle, a railway vehicle, an industrial vehicle, and the like. Can be done.

10: Member mount (cylindrical vibration isolator), 12: Inner shaft member, 14: Outer cylinder member, 16: Rubber elastic body, 18: Thick part (outward projection), 22: Stopper projection (outside 28: inward projection, 32: first flange, 34: second flange, 36: integrally vulcanized molded product, 38: first cushion rubber, 42: second cushion Rubber: 56: Sleeve fitting, 60: Support flange, 64: Press-fit portion, 66: Suspension member (member to be mounted)

Claims (6)

A resin outer cylinder member is extrapolated to the inner shaft member, the inner shaft member and the outer cylinder member are elastically connected by a main rubber elastic body, and a sleeve metal fitting is externally fitted to the outer cylinder member, In the cylindrical vibration isolator in which the outer cylindrical member is press-fitted and fixed to the mounting target member via the sleeve fitting,
A first flange portion that extends toward the outer peripheral side is formed at one end portion in the axial direction of the outer cylindrical member, and a second flange that extends toward the outer peripheral side at the other end portion in the axial direction of the outer cylindrical member Part is formed, and a buffer rubber is provided on each axial outer surface of the first flange part and the second flange part to constitute an axial stopper means,
The sleeve fitting is externally inserted into the outer cylindrical member from the second flange portion side and is brought into contact with the first flange portion in the axial direction, and the outer diameter of the sleeve fitting is reduced by reducing the diameter of the sleeve fitting. It is fitted between the axial direction of the first flange portion and the second flange portion in the tubular member,
While the outer diameter of the press-fitted portion to the mounting target member in the sleeve metal fitting after the diameter reduction is made larger than the outer diameter of the second flange portion ,
A support flange that extends outward is formed at one end of the sleeve fitting in the axial direction, and the support flange is overlapped with the first flange of the outer cylinder member in the axial direction. A cylindrical vibration isolator. A resin outer cylinder member is extrapolated to the inner shaft member, the inner shaft member and the outer cylinder member are elastically connected by a main rubber elastic body, and a sleeve metal fitting is externally fitted to the outer cylinder member, In the cylindrical vibration isolator in which the outer cylindrical member is press-fitted and fixed to the mounting target member via the sleeve fitting,
A first flange portion that extends toward the outer peripheral side is formed at one end portion in the axial direction of the outer cylindrical member, and a second flange that extends toward the outer peripheral side at the other end portion in the axial direction of the outer cylindrical member Part is formed, and a buffer rubber is provided on each axial outer surface of the first flange part and the second flange part to constitute an axial stopper means,
The sleeve fitting is externally inserted into the outer cylindrical member from the second flange portion side and is brought into contact with the first flange portion in the axial direction, and the outer diameter of the sleeve fitting is reduced by reducing the diameter of the sleeve fitting. It is fitted between the axial direction of the first flange portion and the second flange portion in the tubular member,
While the outer diameter of the press-fitted portion to the mounting target member in the sleeve metal fitting after the diameter reduction is made larger than the outer diameter of the second flange portion,
The with a second flange portion is thicker in the axial direction than the first flange portion, the end portion of the other axial of the sleeve component are cylindrical axially extending the sleeve A cylindrical vibration isolator characterized in that the other end surface in the axial direction of the metal fitting is overlapped with the second flange portion in the axial direction. The inner shaft member is formed with an outward projection that protrudes toward the outer cylinder member, and the outer cylinder member is formed with an inward projection that projects toward the inner shaft member. The cylindrical vibration isolator according to claim 1 or 2 . An inner preparation step of preparing an inner shaft member;
An outer preparatory step of preparing a resin-made outer cylinder member including a first flange portion extending on the outer peripheral side at one end portion in the axial direction and a second flange portion extending on the outer peripheral side at the other end portion in the axial direction; ,
A vulcanization molding step of obtaining an integrally vulcanized molded product by extrapolating the outer cylindrical member to the inner shaft member and elastically connecting the outer cylindrical member with a main rubber elastic body;
A sleeve placement step of inserting a sleeve fitting prepared in advance into the outer cylindrical member of the integrally vulcanized molded product from the second flange portion side until it comes into contact with the first flange portion;
And diameter reduction of said sleeve component extrapolated to the outer tubular member, the sleeve component together allowed to fitted between the axial direction of said first flange portion and said second flange portion to the outer cylindrical member A sleeve fixing step in which the outer diameter of the press-fitted portion of the sleeve fitting after the diameter reduction to the mounting target member is larger than the outer diameter of the second flange portion ;
And
A support flange that extends to the outer peripheral side is formed at one end in the axial direction of the sleeve metal fitting, and the support flange is overlapped in the axial direction with the first flange portion of the outer cylindrical member. A method for manufacturing a cylindrical vibration isolator. An inner preparation step of preparing an inner shaft member;
An outer preparatory step of preparing a resin-made outer cylinder member including a first flange portion extending on the outer peripheral side at one end portion in the axial direction and a second flange portion extending on the outer peripheral side at the other end portion in the axial direction; ,
A vulcanization molding step of obtaining an integrally vulcanized molded product by extrapolating the outer cylindrical member to the inner shaft member and elastically connecting the outer cylindrical member with a main rubber elastic body;
A sleeve placement step of inserting a sleeve fitting prepared in advance into the outer cylindrical member of the integrally vulcanized molded product from the second flange portion side until it comes into contact with the first flange portion;
The sleeve fitting externally inserted into the outer cylinder member is reduced in diameter, and the sleeve fitting is fitted on the outer cylinder member between the first flange portion and the second flange portion in the axial direction. A sleeve fixing step in which the outer diameter of the press-fitted portion of the sleeve fitting after the diameter reduction to the mounting target member is larger than the outer diameter of the second flange portion;
And
The second flange portion is thicker in the axial direction than the first flange portion, and the other end portion in the axial direction of the sleeve fitting is formed in a cylindrical shape extending in the axial direction. A method of manufacturing a cylindrical vibration isolator, characterized in that the other end face in the axial direction of the metal fitting is overlapped with the second flange portion in the axial direction. The method of manufacturing a cylindrical vibration isolator according to claim 4 or 5, wherein, in the sleeve fixing step, the outer cylindrical member and the main rubber elastic body are reduced in diameter together with the sleeve fitting.

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