JP2008019928A - Anti-vibration bush and multi-link suspension device provided with the anti-vibration bush - Google Patents

Abstract

An anti-vibration bush capable of further reducing a spring constant in a twisting direction is provided.
An anti-vibration bush comprising a shaft member, an outer cylinder surrounding the shaft member, and a first rubber-like elastic body connecting the shaft member and the outer cylinder. An intermediate portion in the axial direction J is formed as a spherical bulging portion 4 bulging radially outward K2, and a second rubber-like elastic layer 13 is provided on the inner peripheral surface 2N of the outer cylinder 2. Of the inner peripheral surface 13N of the second rubber-like elastic body layer 13, an inner peripheral surface portion surrounding the bulging portion 4 is formed on a concave spherical surface 5M concentric with the convex spherical surface 4M of the bulging portion 4. The first rubber-like elastic body 3 is interposed between the convex spherical surface 4M and the concave spherical surface 5M to connect the convex spherical surface 4M and the concave spherical surface 5M, and the second rubber-like elastic body layer. 13 is a rubber-like elastic body having a higher hardness than the first rubber-like elastic body 3.
[Selection] Figure 1

Description

  The present invention relates to a vibration isolating bush including a shaft member, an outer cylinder surrounding the shaft member, a first rubber-like elastic body connecting the shaft member and the outer cylinder, and a multi-arm including the vibration isolating bush. The present invention relates to a link type suspension device.

As an example, this type of anti-vibration bush is provided between a vehicle body side member of an automobile and one end of a lower arm of a suspension device. Conventionally, the above-mentioned anti-vibration bush includes an inner cylinder as an axial member, an outer cylinder, and a rubber-like elastic body that couples both, and both the inner and outer cylinders are formed in a straight cylinder shape having a constant diameter. For this reason, when it is displaced in the twisting direction, a compression force acts on the rubber-like elastic body, and the spring constant in the twisting direction of the vibration-proof bushing cannot be reduced. Therefore, when used in a suspension device, there has been a problem that the ride comfort of the automobile is deteriorated. Therefore, as disclosed in Patent Document 1, a vibration isolating bush has been proposed in which an axial intermediate portion of the inner cylinder is formed as a spherical bulge that bulges radially outward.
JP 2004-144150 A

  However, even in the structure of Patent Document 1, when the rubber-like elastic body is elastically deformed in the twisting direction, the rubber-like elastic body is between the inner cylinder and the outer cylinder at both ends in the axial direction of the rubber-like elastic body. As a result, the spring constant of the anti-vibration bush in the twisting direction could not be made sufficiently small.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration isolating bush capable of reducing the spring constant in the twisting direction, and a multilink suspension device including the vibration isolating bush. The point is to provide.

The feature of the first invention is the anti-vibration bush described in the [Technical field] at the beginning.
An axial intermediate portion of the shaft member is configured as a spherical bulging portion bulging radially outward, and a second rubber-like elastic body layer is provided on the inner peripheral surface of the outer cylinder, Of the inner peripheral surface of the second rubber-like elastic layer, an inner peripheral surface portion surrounding the bulging portion is formed as a concave spherical surface that is concentric with the convex spherical surface of the bulging portion. The rubber-like elastic body is interposed between the convex spherical surface and the concave spherical surface to connect the convex spherical surface and the concave spherical surface, and the second rubber-like elastic body layer is the first rubber. It is in the point which consists of a rubber-like elastic body whose hardness is higher than the shape-like elastic body. (Claim 1)

According to this configuration,
(A1) The axial intermediate portion of the shaft member is formed as a spherical bulge that bulges radially outward, and the inner part of the second rubber-like elastic layer provided on the inner peripheral surface of the outer cylinder Of the peripheral surface, an inner peripheral surface portion surrounding the bulging portion is formed into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion, and the second rubber-like elastic body layer includes the first rubber-like elastic layer. Since the rubber-like elastic body is higher in hardness than the rubber-like elastic body, when the anti-vibration bushing is displaced in the twisting direction, the difference between the convex spherical surface and the concentric concave spherical surface is obtained. 1 The rubber-like elastic body part is mainly subjected to shearing, and the spring constant in the twisting direction can be reduced. (Claim 1)

(B1) As a structure for obtaining the action (A1), for example, without providing the second rubber-like elastic layer, the inner peripheral surface of the outer cylinder having a constant inner diameter is cut to form a concave spherical surface. A structure in which the first rubber-like elastic body is vulcanized and bonded to the concave spherical surface is also conceivable. However, in this structure, it takes time for cutting, and the productivity when manufacturing the outer cylinder decreases. In addition, chips are generated and the material is expensive. On the other hand, according to the said structure of this invention, the 2nd rubber-like elastic body layer provided with the said concave spherical surface can be shape | molded using a shaping | molding die, and a cutting process can be skipped. (Claim 1)

In the first invention,
The rubber-like elastic body of the second rubber-like elastic body layer is vulcanized and bonded to the inner peripheral surface of the outer cylinder,
A plurality of grooves extending in the axial direction are formed in the circumferential direction on the inner circumferential surface of the second rubber-like elastic body layer, and the outer circumferential surface of the shaft member and the second rubber-like elastic body layer The first rubber-like elastic body is vulcanized and bonded to the peripheral surface, and after the first rubber-like elastic body enters the concave groove and vulcanized and bonded to the inner peripheral surface of the concave groove, the outer cylinder is When drawn, the following effects can be achieved. (Claim 2)

(C1) A plurality of concave grooves extending in the axial direction are formed in the circumferential direction on the inner peripheral surface of the second rubber-like elastic body layer, and when the outer cylinder is drawn, the groove width of the concave grooves is reduced. Thus, the outer cylinder is drawn and deformed, so that even if the outer cylinder and the cylinder made of the second rubber-like elastic layer are thick, the cylinder can be easily drawn. (Claim 2)
(D1) When the outer cylinder is squeezed and deformed as described above, the coating on the inner peripheral surface of the outer cylinder formed by the chemical conversion treatment before the vulcanization adhesion of the rubber-like elastic body becomes difficult to be destroyed. Thereby, the adhesion state of the 2nd rubber-like elastic body layer with respect to the internal peripheral surface of an outer cylinder can be kept favorable. And the durability of the second rubber-like elastic body layer and the first rubber-like elastic body can be improved by the above drawing process. (Claim 2)
(E1) The first rubber-like elastic body is vulcanized and bonded to the outer peripheral surface of the shaft member and the inner peripheral surface of the second rubber-like elastic body layer, and further, the first rubber-like elastic body is the second rubber-like body. Since it enters the concave groove formed on the inner peripheral surface of the elastic body layer and is vulcanized and bonded to the inner peripheral surface of the concave groove, the first rubber-like elastic body is It is possible to avoid sliding displacement in the circumferential direction with respect to the two rubber-like elastic layers. (Claim 2)

The feature of the second invention is the anti-vibration bush described in the [Technical field] at the beginning.
An axial intermediate portion of the shaft member is configured as a spherical bulging portion bulging radially outward, a resin layer is provided on the inner peripheral surface of the outer cylinder, and an inner periphery of the resin layer Of the surface, an inner peripheral surface portion surrounding the bulging portion is formed into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion, and the first rubber-like elastic body has the convex shape. The convex spherical surface and the concave spherical surface are connected between a spherical surface and a concave spherical surface, and the resin layer is formed of a resin material having a hardness higher than that of the first rubber-like elastic body. . (Claim 3)

According to this configuration,
(A2) The axial intermediate portion of the shaft member is configured as a spherical bulging portion bulging radially outward, and among the inner peripheral surface of the resin layer provided on the inner peripheral surface of the outer cylinder, The inner peripheral surface portion surrounding the bulging portion is formed as a concave spherical surface concentric with the convex spherical surface of the bulging portion, and the resin layer is a resin having a hardness higher than that of the first rubber-like elastic body. Since the anti-vibration bush is displaced in the twisting direction, the first rubber-like elastic body portion between the convex spherical surface and the concentric concave spherical surface is mainly sheared. Thus, the spring constant in the twisting direction can be reduced. (Claim 3)

(B2) As a structure for obtaining the function (A2), for example, without providing a resin layer, the inner peripheral surface of an outer cylinder having a constant inner diameter is cut to form a concave spherical surface. Although a structure in which the first rubber-like elastic body is vulcanized and bonded to the spherical surface is also conceivable, this structure takes time for cutting and reduces the productivity when manufacturing the outer cylinder. In addition, chips are generated and the material is expensive. On the other hand, according to the said structure of this invention, the resin layer provided with the said concave spherical surface can be shape | molded using a shaping | molding die, and a cutting process can be omitted. (Claim 3)

In the second invention,
A plurality of grooves extending in the axial direction are formed in the circumferential direction on the inner circumferential surface of the resin layer, and the first rubber-like elasticity is formed on the outer circumferential surface of the shaft member and the inner circumferential surface of the resin layer. When the body is vulcanized and bonded, and the outer cylinder is drawn after the first rubber-like elastic body enters the recessed groove and vulcanized and bonded to the inner peripheral surface of the recessed groove, Can be played. (Claim 4)

(C2) A plurality of concave grooves extending in the axial direction are formed in the circumferential direction on the inner peripheral surface of the resin layer, and when the outer cylinder is drawn, the outer cylinder is formed so that the groove width of the concave groove is reduced. Therefore, even if the cylinder formed of the outer cylinder and the resin layer is thick, the cylinder can be easily drawn. (Claim 4)
(E2) The first rubber-like elastic body is vulcanized and bonded to the outer peripheral surface of the shaft member and the inner peripheral surface of the resin layer, and the first rubber-like elastic body is formed on the inner peripheral surface of the resin layer. The first rubber-like elastic body slides and displaces in the circumferential direction with respect to the resin layer when a force in the torsional direction is applied, because it enters the concave groove and is vulcanized and bonded to the inner peripheral surface of the concave groove. Can be avoided. (Claim 4)

In the first or second invention,
The cylinder formed of the outer cylinder and the second rubber-like elastic body layer or the resin layer is divided into a first cylinder part and a second cylinder part in the axial direction at the center of the concave spherical surface in the axial direction. If it is done, the following effects can be achieved. (Claim 5)

When removing the second rubber-like elastic body layer part constituting the first cylinder part in the step of vulcanizing and molding the first outer cylinder part constituting the first cylinder part, the concave spherical surface or the groove is provided. By pulling out the middle mold to be formed on the outer side of the concave spherical surface in the axial direction of the first outer cylinder portion, the middle mold can be pulled out without being obstructed by the second rubber-like elastic body layer portion. Similarly, when demolding in the step of vulcanizing and bonding the second rubber-like elastic body layer part constituting the second cylinder part to the second outer cylinder part constituting the second cylinder part, the concave spherical surface or By pulling out the middle mold for forming the concave groove to the outside of the concave spherical surface in the axial direction of the second outer cylinder portion, the middle mold can be pulled out without being obstructed by the second rubber-like elastic body layer portion. it can. (Claim 5)
Also,
When removing the mold in the step of molding the resin layer part constituting the first cylinder part to the first outer cylinder part constituting the first cylinder part, the middle mold for forming the concave spherical surface or the groove is By pulling out from the concave spherical surface in the axial direction of the first outer cylinder portion, the middle mold can be pulled out without being obstructed by the resin layer portion. Similarly, when the mold is removed in the step of vulcanizing and bonding the resin layer part constituting the second cylinder part to the second outer cylinder part constituting the second cylinder part, the concave spherical surface or the groove is formed. Therefore, the middle mold can be pulled out without being obstructed by the resin layer portion by pulling out the middle mold to the outside of the concave spherical surface in the axial direction of the second outer cylinder portion. (Claim 5)

The feature of the third invention is
A wheel support for rotatably supporting the wheel;
A pair of front and rear upper arms whose one end is swingably connected to the wheel support and whose other end is swingably connected to the vehicle body member;
A pair of front and rear lower arms, one end of which is swingably connected to the wheel support and the other end is swingably connected to the vehicle body side member;
A toe control link having one end portion swingably connected to the wheel support and the other end portion swingably connected to the vehicle body side member;
The other end portion of the front lower arm and the vehicle body side member are connected via a first vibration isolation bush, and the other end portion of the rear lower arm and the vehicle body side member are connected via a second vibration isolation bush. Connecting, the other end of the toe control link and the vehicle body side member are connected via a third anti-vibration bush,
The axial center of the first anti-vibration bush is along a direction orthogonal to the longitudinal direction of the front lower arm in plan view, and the axial center of the second anti-vibration bush is in the plan view of the rear lower arm. The first anti-vibration bush and the second anti-vibration bush and the second anti-vibration bush so that the axial center of the third anti-vibration bush is along the direction perpendicular to the longitudinal direction of the toe control link in plan view. A vibration isolation bush and a third vibration isolation bush are arranged,
The first anti-vibration bush is the anti-vibration bush according to any one of claims 1 to 5,
The second anti-vibration bush is the anti-vibration bush according to any one of claims 1 to 5,
The third anti-vibration bush is a multi-link suspension device that is the anti-vibration bush according to any one of claims 1 to 5. (Claim 6)

Multi-link suspension devices (sometimes abbreviated as “suspension devices”)
A wheel support for rotatably supporting the wheel;
A pair of front and rear upper arms whose one end is swingably connected to the wheel support and whose other end is swingably connected to the vehicle body member;
A pair of front and rear lower arms, one end of which is swingably connected to the wheel support and the other end is swingably connected to the vehicle body side member;
A toe control link having one end portion swingably connected to the wheel support and the other end portion swingably connected to the vehicle body side member;
The other end portion of the front lower arm and the vehicle body side member are connected via a first vibration isolation bush, and the other end portion of the rear lower arm and the vehicle body side member are connected via a second vibration isolation bush. Connecting, the other end of the toe control link and the vehicle body side member are connected via a third anti-vibration bush,
The axial center of the first anti-vibration bush is along a direction orthogonal to the longitudinal direction of the front lower arm in plan view, and the axial center of the second anti-vibration bush is in the plan view of the rear lower arm. The first anti-vibration bush and the second anti-vibration bush and the second anti-vibration bush so that the axial center of the third anti-vibration bush is along the direction perpendicular to the longitudinal direction of the toe control link in plan view. An anti-vibration bush and a third anti-vibration bush are arranged.
In this type of suspension device, the pair of front and rear lower arms, the toe control link, and the first to third vibration isolating bushes are set in an inclined posture in plan view. To the third anti-vibration bush, force in the axial direction J (see FIG. 1), force in the direction perpendicular to the axis Y (see FIG. 1), force in the twisting direction Z (see FIG. 1), force in the twisting direction N (see FIG. 2) Various forces are added. For example, when the suspension device is displaced in the vertical direction with respect to the vehicle body, not only a force in the twisting direction N but also a force in the twisting direction Z is applied to the first to third vibration isolating bushes. When the suspension device is displaced in the left-right direction with respect to the vehicle body, not only the force in the direction perpendicular to the axis Y but also the force in the axis direction J is applied to the first to third vibration isolating bushes.

  Generally, anti-vibration bushes are also interposed between the pair of front and rear upper arms and the vehicle body side member, and the above-described various forces are also applied to these anti-vibration bushes, but the lateral force from the road surface passes through the tires. When it is applied to the suspension device, it is in a state where it is stretched by a pair of front and rear lower arms and toe control links. Therefore, a larger force is applied to the first to third vibration isolation bushes than the vibration isolation bush on the upper arm side. It will be. That is, the first to third vibration isolating bushes greatly affect the value of the spring constant of the suspension device (the spring constant of the suspension device determined by each arm and the vibration isolating bush).

  According to the structure of the conventional vibration isolating bush, the first to third anti-vibration bushes are formed in a straight cylindrical shape having a constant diameter in both the inner and outer cylinders. The spring constant becomes larger. As a result, the spring constant in the vertical direction of the suspension device becomes large, and it is difficult to improve the riding comfort of the vehicle. Further, in the first to third vibration isolating bushes of the conventional structure, the spring constant in the axial direction is not so large, and the spring constant in the left and right direction of the suspension device cannot be increased, thereby improving the steering stability of the vehicle. It is difficult to improve.

  On the other hand, according to the above-described configuration of the third aspect of the present invention, the first anti-vibration bush, the second anti-vibration bush, and the third anti-vibration bush are as described in any one of claims 1 to 5. Since it is the described vibration-proof bushing, the following effects can be achieved. That is, the axial intermediate portion of the shaft member of the first vibration isolating bush, the second anti-vibration bush, and the third anti-vibration bush is configured as a spherical bulge that bulges radially outward. Since the inner peripheral surface portion of the outer cylinder surrounding the bulging portion is formed as a concave spherical surface that is concentric with the convex spherical surface of the bulging portion, when the vibration isolating bushing is displaced in the twisting direction, the convex shape The rubber-like elastic body portion between the spherical surface and the concentric concave spherical surface is mainly subjected to shearing, and the spring constant in the twisting direction can be reduced. (As described above, when the suspension device is displaced in the vertical direction with respect to the vehicle body, not only the twisting direction but also the force in the twisting direction is applied to the first to third vibration isolating bushes). Thereby, the spring constant of the up-down direction of a suspension apparatus can be made small. When the first to third anti-vibration bushes are displaced in the axial direction, the rubber-like elastic body portion between the convex spherical surface and the concentric concave spherical surface receives a compressive force. Therefore, the spring constant in the axial direction can be made sufficiently large (as described above, when the suspension device is displaced in the left-right direction with respect to the vehicle body, the first to third vibration isolating bushes are only in the direction perpendicular to the axis. Without any axial force). Thereby, the spring constant of the left-right direction of a suspension apparatus can be enlarged. Furthermore, the effect similar to the said effect | action as described in any one of Claims 1-5 can be show | played. (Claim 6)

  Therefore, according to the first and second inventions, the anti-vibration bush capable of reducing the spring constant in the twisting direction, increasing the productivity, and reducing the material cost, and the anti-vibration A multi-link suspension device provided with a bush, that is, a multi-link suspension device that can improve the riding comfort of the vehicle and can improve the steering stability of the vehicle can be provided.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 5 show an anti-vibration bush 101 used in an automobile suspension device (FIG. 1 is a longitudinal sectional view of the anti-vibration bush 101 before drawing, and FIG. 4 shows an anti-vibration bush 101 after drawing. Is a longitudinal sectional view). The anti-vibration bush 101 includes an inner cylinder 1 having a circular cross-section as a shaft member, an outer cylinder 2 having a circular cross-section surrounding the inner cylinder 1, a first rubber-like elastic body 3 connecting the inner cylinder 1 and the outer cylinder 2, and The inner cylinder 1 is clamped and fixed to a pair of clamping parts 17a of a bracket 17 (corresponding to a second assembly object) of the suspension member via a mounting bolt (not shown) penetrating the inner cylinder 1, The outer cylinder 2 is press-fitted into the press-fitting hole 54 of one end portion 110 (corresponding to the first assembly object) of the lower arm 81.

  The inner cylinder 1 has a spherical bulging portion 4 whose middle portion in the axial direction J bulges radially outward K2. The center O of the bulging portion 4 is located on the axis P of the inner cylinder 1. The outer cylinder 2 is formed in a straight cylinder whose outer diameter is constant over the entire length, and a second rubber made of a rubber-like elastic body having a hardness higher than that of the first rubber-like elastic body 3 on the inner peripheral surface 2N of the outer cylinder 2. The rubber-like elastic body is vulcanized and bonded to the inner peripheral surface 2N of the outer cylinder 2. Of the inner peripheral surface 13N of the second rubber-like elastic body layer 13, the inner peripheral surface portion surrounding the bulging portion 4 is a concentric concave spherical surface 5M concentric with the convex spherical surface 4M of the bulging portion 4. Is formed. The first rubber-like elastic body 3 is interposed between the convex spherical surface 4M and the concave spherical surface 5M and couples both 4M and 5M.

  A plurality of (12 in this embodiment) concave grooves 6 extending in the axial direction J are formed on the inner peripheral surface 13N of the second rubber-like elastic body layer 13 at intervals wider than the groove width of the concave grooves 6 in the circumferential direction S. It is formed in a dispersed manner. The first rubber-like elastic body 3 is vulcanized and bonded to the outer peripheral surface 1G of the inner cylinder 1 and the inner peripheral surface 13N of the second rubber-like elastic body layer 13, and the first rubber-like elastic body 3 is recessed. After entering the groove 6 and vulcanized and bonded to the inner peripheral surface 6N of the concave groove 6, the outer cylinder 2 is drawn. In the state before the drawing process, the inner peripheral surface portion of the second rubber-like elastic layer 13 is not strictly a concave spherical surface, but a concave shape in which the center O is located on the axis P of the inner cylinder 1 by the drawing process. The spherical surface becomes 5M.

  In the cross section along the axial direction J of the inner and outer cylinders 1 and 2, the circumference of the rubber-like elastic body portion between the virtual spherical surface 117 defined by the concave spherical surface 5M and the virtual spherical surface 7 defined by the convex spherical surface 4M. A pair of arcuate open end faces 8 exposed between the inner cylinder 1 and both ends of the outer cylinder 2 in the axial direction J are formed at both ends in the direction S. Since the open end surface 8 is formed, a structure in which the open end surface 8 is not formed (the space between the inner cylinder 1 and both ends in the axial direction J of the outer cylinder 2 is filled with the rubber-like elastic body 3. The spring constant of the anti-vibration bushing 101 in the twisting direction Z can be set smaller than that of the structure.

The manufacturing method of said vibration-proof bushing 101 is as follows.
(1) The outer cylinder 2 is set on the outer mold, the first middle mold for molding the concave spherical surface 5M and the concave groove 6 is attached to the outer mold, and the second rubber-like elastic body layer 13 is vulcanized. The second rubber-like elastic body layer 13 is vulcanized and bonded to the inner peripheral surface 2N of the outer cylinder 2. Thereby, as shown in FIG. 3, the cylinder 15 which consists of the outer cylinder 2 and the 2nd rubber-like elastic-body layer 13 is formed.
(2) The first middle mold is removed from the outer mold, and the inner cylinder 1 and the second middle mold for forming the open end surface 8 are set in the outer mold on which the cylinder 15 is set, and the first rubber-like elastic body 3 is vulcanized and molded, and the first rubber-like elastic body 3 is vulcanized and bonded to the inner peripheral surface 13N of the second rubber-like elastic body layer 13. The first rubber-like elastic body 3 also enters the groove 6 and is vulcanized and bonded to the inner peripheral surface 6N of the groove 6. FIG. 1 shows an anti-vibration bush 101 before drawing.
(3) After the mold removal, the outer cylinder 2 is drawn. FIG. 4 shows the anti-vibration bush 101 after drawing.

[Second Embodiment]
6 to 10 show an anti-vibration bush 101 of a second embodiment used in an automobile suspension device (FIG. 6 is a longitudinal sectional view of the anti-vibration bush 101 before drawing, and FIG. 9 shows an after-drawing process. This is a longitudinal sectional view of the anti-vibration bush 101 of FIG. The anti-vibration bush 101 of the second embodiment differs from the anti-vibration bush 101 of the first embodiment in that it is divided into two in the axial direction J. Explaining the difference, the cylindrical body 15 composed of the outer cylinder 2 and the second rubber-like elastic body layer 13 has the first cylindrical portion 31 and the first cylindrical portion 31 in the axial direction J at the central portion L of the concave spherical surface 5M in the axial direction J. It is divided into two cylinder parts 32. The first cylindrical portion 31 and the second cylindrical portion 32 are in an assembled state in which the first cylindrical portion 31 and the second cylindrical portion 32 are press-fitted into the press-fitting hole 54 of the one end portion 53 of the lower arm 52. The dividing surface 32B is configured to contact each other.

The manufacturing method of the vibration-proof bushing 101 of 2nd Embodiment is as follows.
(1) The first outer cylinder portion 21 of the first cylinder portion 31 is set on the outer mold, the first middle mold for forming the concave spherical surface 5M and the concave groove 6 is attached to the outer mold, and the first outer cylinder The second rubber-like elastic body layer portion 41 of the first cylindrical portion 31 is vulcanized and formed on the inner peripheral surface 2N of the portion 21. Then, the first middle mold is pulled out to the axially outer side of the first cylindrical portion 31 (the outer side of the concave spherical surface 5M) and removed from the outer mold. Thereby, the 1st cylinder part 31 is formed (refer FIG. 8).
(2) The second outer cylinder portion 22 of the second cylinder portion 32 is set on the outer mold, the first middle mold for forming the concave spherical surface 5M and the concave groove 6 is attached to the outer mold, and the second outer cylinder The second rubber-like elastic body layer portion 42 of the second cylindrical portion 32 is vulcanized and formed on the inner peripheral surface 2N of the portion 22. Then, the first middle mold is pulled out to the axially outer side of the second cylindrical portion 32 (the outer side of the concave spherical surface 5M) and removed from the outer mold. Thereby, the 2nd cylinder part 32 is formed (refer FIG. 8).
(3) Set the first cylinder part 31, the second cylinder part 32, the inner cylinder 1, and the second middle mold for forming the open end face 8 in the outer mold, and add the first rubber-like elastic body 3 The first rubber-like elastic body 3 is vulcanized and bonded to the inner peripheral surface 13N of the second rubber-like elastic body layer. The first rubber-like elastic body 3 also enters the groove 6 and is vulcanized and bonded to the inner peripheral surface 6N of the groove 6. FIG. 6 shows the anti-vibration bush 101 before drawing.
(4) After the mold removal, the outer cylinder 2 is drawn. FIG. 9 shows the anti-vibration bush 101 after drawing.
The order of (1) and (2) above may be reversed. Further, (1) and (2) may be performed simultaneously.

[Another embodiment of the first and second embodiments]
(1) A resin layer 13 may be provided in place of the second rubber-like elastic layer 13. That is, the resin layer 13 is provided on the inner peripheral surface 2N of the outer cylinder 2, and the inner peripheral surface portion surrounding the bulging portion 4 of the inner peripheral surface 13N of the resin layer 13 is a convex shape of the bulging portion 4. The first rubber-like elastic body 3 is formed between a convex spherical surface 4M and a concave spherical surface 5M, and is formed on a concave spherical surface 5M concentric with the spherical surface 4M. 5M and the resin layer 13 may be an anti-vibration bush made of a resin material having a hardness higher than that of the first rubber-like elastic body 3.
(2) The anti-vibration bush 101 of the present invention can also be applied to an automobile engine mount.

[Third Embodiment]
3rd Embodiment has shown the multi-link type suspension apparatus 100 provided with the said anti-vibration bush (FIGS. 11-14). Hereinafter, this embodiment will be described. As shown in FIGS. 11 to 14, the suspension device 100 includes a wheel support 61 that rotatably supports a wheel 60, and one end portions 71 a and 72 a that are swingably connected to the wheel support 61 and the other end. A pair of front and rear upper arms 71 and 72, whose ends 71b and 72b are swingably connected to a suspension member 62 (corresponding to a vehicle body side member), and one end portions 81a and 82a are swingably connected to the wheel support 61. The other end portions 81b and 82b are swingably connected to the suspension member 62 and a pair of front and rear lower arms 81 and 82, one end portion 91a is swingably connected to the wheel support 61, and the other end portion 91b is suspended. A toe control link 91 slidably connected to the member 62 is provided.

  Reference numeral 63 is a shock absorber, 64 is a coil spring provided in the shock absorber, 65 is an axle, 66 and 67 are left and right drive shafts linked to the axle 65, and 68 is a brake device. F indicates the front side of the vehicle body.

  As shown in FIG. 14, the front lower arm 81 in the plan view is set to an inclined posture that is located on the vehicle front side F toward the vehicle interior side H1 in the vehicle body width direction H, and the rear lower arm 82 in the plan view is In the width direction H, the vehicle body inward side H1 is set to an inclined posture positioned on the vehicle body rear side U. In plan view, the toe control link 91 is positioned on the vehicle body inward side H1 in the vehicle body width direction H on the vehicle body rear side U. It is set to an inclined posture.

  The other end 81b of the front lower arm 81 and the suspension member 62 are connected via the first vibration isolation bush 101, and the other end 82b of the rear lower arm 82 and the suspension member 62 connect the second vibration isolation bush 102. The other end 91 b of the toe control link 91 and the suspension member 62 are connected via a third vibration isolating bush 103. The one end 81a of the front lower arm 81 and the wheel support 61 are connected via the first ball joint 111, and the one end 82a of the rear lower arm 82 and the wheel support 61 connect the second ball joint 112. The one end 91a of the toe control link 91 and the wheel support 61 are connected via a third ball joint 113.

  Further, the other end 71b of the front upper arm 71 and the suspension member 62 are connected via the fourth vibration isolating bush 104, and the other end 72b of the rear upper arm 72 and the suspension member 62 are connected to the fifth anti-vibration bush 104. The one end 71a of the front upper arm 71 and the wheel support 61 are connected via the fourth ball joint 114, and the one end 72a of the rear upper arm 72 and the wheel support. 61 is connected via a fifth ball joint 115.

  As shown in FIG. 14, the shaft center p <b> 1 of the first vibration isolating bush 101 is along the direction T <b> 1 orthogonal to the longitudinal direction r <b> 1 of the front lower arm 81 in plan view, and the shaft center p <b> 2 of the second vibration isolating bush 102. However, in plan view, it is along the direction T2 orthogonal to the longitudinal direction r2 of the rear lower arm 82, and the axial center p3 of the third vibration isolating bush 103 is orthogonal to the longitudinal direction r3 of the toe control link 91 in plan view. The postures of the first vibration isolation bush 101, the second vibration isolation bush 102, and the third vibration isolation bush 103 are set along the direction T3. Further, the shaft center p4 of the fourth vibration isolating bush 104 is along a direction T4 orthogonal to the longitudinal direction r4 of the front upper arm 71 in plan view, and the shaft core p5 of the fifth vibration isolating bush 105 is in plan view. The postures of the fourth anti-vibration bush 104 and the fifth anti-vibration bush 105 are set along the direction T5 orthogonal to the longitudinal direction r5 of the rear upper arm 72.

Said 1st-3rd anti-vibration bush 101-103 consists of the anti-vibration bush of the said 1st Embodiment. Since the structure has been described, a description thereof will be omitted. The mounting structure of the first to fifth anti-vibration bushes 101 to 105 on the vehicle body side is the same as the structure shown in FIG. That is, as shown in FIG. 5, the inner cylinder 1 is clamped and fixed to a pair of clamping portions 17 a of a bracket 17 (corresponding to the second assembly target) of the suspension member via a mounting bolt that penetrates the inner cylinder 1. The outer cylinder 2 is press-fitted into the press-fitting hole 54 of the one end portion 110 (corresponding to the first assembly object) of the lower arm 81.

[Another embodiment of the third embodiment]
The first anti-vibration bush 101 is composed of any one of the anti-vibration bushes of the first embodiment to the second embodiment, and the second anti-vibration bush 102 is any of the first embodiment to the second embodiment. The third anti-vibration bush 103 may be composed of any one anti-vibration bush in the first to second embodiments.

It is a longitudinal cross-sectional view of the anti-vibration bush before drawing and is a cross-sectional view taken along the line AA in FIG. A view of the anti-vibration bush viewed from the axial direction Longitudinal sectional view of the cylinder (AA sectional view of the cylinder of FIG. 2) Longitudinal section of anti-vibration bush after drawing Diagram showing the installation structure of anti-vibration bushing It is a longitudinal cross-sectional view of the anti-vibration bush before drawing processing of 2nd Embodiment, and is AA sectional drawing of FIG. The figure which looked at the anti-vibration bush of 2nd Embodiment from the axial direction The longitudinal cross-sectional view of the cylinder of 2nd Embodiment (AA sectional drawing of the cylinder of FIG. 7) Longitudinal sectional view of anti-vibration bush after drawing in the second embodiment The figure which shows the attachment structure of the vibration proof bush of 2nd Embodiment Perspective view showing a multi-link suspension device The rear view which shows the multilink type suspension apparatus of the left side of FIG. The side view which looked at the multilink type suspension device of Drawing 12 from the inside FIG. 12 is a plan view of the multi-link suspension device of FIG.

Explanation of symbols

1 Inner cylinder (shaft member)
1G Outer surface of inner cylinder (outer surface of shaft member)
2 outer cylinder 2N inner peripheral surface 3 of outer cylinder 1st rubber-like elastic body 4 bulging part (intermediate part)
4M Convex spherical surface 5M Concave spherical surface (inner peripheral surface portion of the second rubber-like elastic layer)
6 concave groove 6N inner circumferential surface 7 of concave groove Virtual spherical surface 8 defined by convex spherical surface Open end surface 13 Second rubber-like elastic layer (resin layer)
13N Inner peripheral surface of second rubber-like elastic body layer (inner peripheral surface of resin layer)
15 Cylindrical body 17 Bracket (second assembly target)
17a Nipping part 21 1st outer cylinder part 22 2nd outer cylinder part 31 1st cylinder part 31B Dividing surface 32 of the 1st cylinder part 2nd cylinder part 32B Dividing surface 41 of the 2nd cylinder part 2nd rubber of the 1st cylinder part -Like elastic body layer portion 42 Second rubber-like elastic body layer portion 54 of the second cylinder portion Press-fit hole 60 Wheel 61 Wheel support body 62 Vehicle body side member (suspension member)
63 Shock absorber 64 Coil spring 65 Axle 66, 67 Drive shaft 68 Brake device 71 Upper arm (front upper arm)
71a One end (one end of the front upper arm)
71b The other end (the other end of the front upper arm)
72 Upper arm (rear upper arm)
72a One end (one end of the rear upper arm)
72b The other end (the other end of the rear upper arm)
81 Lower arm (front lower arm)
81a One end (one end of the front lower arm)
81b The other end (the other end of the lower arm on the front side)
82 Lower arm (lower lower arm)
82a One end (one end of the rear lower arm)
82b The other end (the other end of the lower lower arm)
91 Toe control link 91a One end (one end of the toe control link)
91b The other end (the other end of the toe control link)
DESCRIPTION OF SYMBOLS 100 Multilink-type suspension apparatus 101 1st anti-vibration bush 102 2nd anti-vibration bush 103 3rd anti-vibration bush 104 4th anti-vibration bush 105 5th anti-vibration bush 110 One end part of a lower arm (1st assembly object)
111 First ball joint 112 Second ball joint 113 Third ball joint 114 Fourth ball joint 115 Fifth ball joint 117 Virtual spherical surface defined by concave spherical surface J Axial direction K Radial direction K2 Radial outward side L Central portion O Center (center of bulge)
P Shaft core of inner cylinder S Circumferential direction Z Twist direction F Front side of vehicle body H Vehicle body width direction H1 Vehicle body inner side U Vehicle body rear side Y-axis perpendicular direction N Torsion direction p1 Shaft core p2 First vibration isolation bushing shaft p2 Second vibration isolation Bushing shaft core p3 Third vibration isolation bushing shaft core p4 Fourth vibration isolation bushing shaft core p5 Fifth vibration isolation bushing shaft core r1 Front lower arm longitudinal direction T1 Front lower arm longitudinal direction r2 Longitudinal direction T2 of the rear lower arm Direction r3 perpendicular to the longitudinal direction of the lower lower arm r3 Longitudinal direction T3 of the toe control link Direction r4 perpendicular to the longitudinal direction of the toe control link Longitudinal direction T4 of the upper upper arm Front upper arm The direction r5 orthogonal to the longitudinal direction of the rear side The longitudinal direction T5 of the rear upper arm T5 The direction orthogonal to the longitudinal direction of the rear upper arm

Claims (6)

An anti-vibration bush comprising a shaft member, an outer cylinder surrounding the shaft member, and a first rubber-like elastic body connecting the shaft member and the outer cylinder,
An axial intermediate portion of the shaft member is configured as a spherical bulging portion bulging radially outward, and a second rubber-like elastic body layer is provided on the inner peripheral surface of the outer cylinder, Of the inner peripheral surface of the second rubber-like elastic layer, an inner peripheral surface portion surrounding the bulging portion is formed as a concave spherical surface that is concentric with the convex spherical surface of the bulging portion. The rubber-like elastic body is interposed between the convex spherical surface and the concave spherical surface to connect the convex spherical surface and the concave spherical surface, and the second rubber-like elastic body layer is the first rubber. Anti-vibration bush consisting of a rubber-like elastic body having a hardness higher than that of the elastic body. The rubber-like elastic body of the second rubber-like elastic body layer is vulcanized and bonded to the inner peripheral surface of the outer cylinder,
A plurality of grooves extending in the axial direction are formed in the circumferential direction on the inner circumferential surface of the second rubber-like elastic body layer, and the outer circumferential surface of the shaft member and the second rubber-like elastic body layer The first rubber-like elastic body is vulcanized and bonded to the peripheral surface, and after the first rubber-like elastic body enters the concave groove and vulcanized and bonded to the inner peripheral surface of the concave groove, the outer cylinder is 2. The anti-vibration bush according to claim 1, which is drawn. An anti-vibration bush comprising a shaft member, an outer cylinder surrounding the shaft member, and a first rubber-like elastic body connecting the shaft member and the outer cylinder,
An axial intermediate portion of the shaft member is configured as a spherical bulging portion bulging radially outward, a resin layer is provided on the inner peripheral surface of the outer cylinder, and an inner periphery of the resin layer Of the surface, an inner peripheral surface portion surrounding the bulging portion is formed into a concave spherical surface that is concentric with the convex spherical surface of the bulging portion, and the first rubber-like elastic body has the convex shape. An anti-vibration bush comprising a convex spherical surface and a concave spherical surface interposed between a spherical surface and a concave spherical surface, wherein the resin layer is made of a resin material having a hardness higher than that of the first rubber-like elastic body. .   A plurality of grooves extending in the axial direction are formed in the circumferential direction on the inner circumferential surface of the resin layer, and the first rubber-like elasticity is formed on the outer circumferential surface of the shaft member and the inner circumferential surface of the resin layer. 4. The outer cylinder is drawn after the body is vulcanized and bonded, and the first rubber-like elastic body enters the concave groove and is vulcanized and bonded to the inner peripheral surface of the concave groove. Anti-vibration bush.   The cylinder formed of the outer cylinder and the second rubber-like elastic body layer or the resin layer is divided into a first cylinder part and a second cylinder part in the axial direction at the center of the concave spherical surface in the axial direction. The anti-vibration bush according to any one of claims 1 to 4. A wheel support for rotatably supporting the wheel;
A pair of front and rear upper arms whose one end is swingably connected to the wheel support and whose other end is swingably connected to the vehicle body member;
A pair of front and rear lower arms, one end of which is swingably connected to the wheel support and the other end is swingably connected to the vehicle body side member;
A toe control link having one end portion swingably connected to the wheel support and the other end portion swingably connected to the vehicle body side member;
The other end portion of the front lower arm and the vehicle body side member are connected via a first vibration isolation bush, and the other end portion of the rear lower arm and the vehicle body side member are connected via a second vibration isolation bush. Connecting, the other end of the toe control link and the vehicle body side member are connected via a third anti-vibration bush,
The axial center of the first anti-vibration bush is along a direction orthogonal to the longitudinal direction of the front lower arm in plan view, and the axial center of the second anti-vibration bush is in the plan view of the rear lower arm. The first anti-vibration bush and the second anti-vibration bush and the second anti-vibration bush so that the axial center of the third anti-vibration bush is along the direction perpendicular to the longitudinal direction of the toe control link in plan view. A vibration isolation bush and a third vibration isolation bush are arranged,
The first anti-vibration bush is the anti-vibration bush according to any one of claims 1 to 5,
The second anti-vibration bush is the anti-vibration bush according to any one of claims 1 to 5,
The multi-link suspension device, wherein the third vibration-proof bushing is the vibration-proof bushing according to any one of claims 1 to 5.

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