JP2020093720A - Toe correct bush and trailing arm type suspension - Google Patents

Abstract

To provide a toe correct bush which can improve a toe correct force against twisting input during cornering.SOLUTION: A toe correct bush, which connects a front end side of a trailing arm extending along a cross direction of a vehicle body and the vehicle body, comprises: an inner cylinder which is fixed to the vehicle body; an outer cylinder which is located on an outer peripheral side of the inner cylinder, and is fixed to the trailing arm; a flange part which is provided on one end side of the outer cylinder, and extends in one direction of radial directions of the outer cylinder; and an elastic body which elastically connects the outer cylinder and the inner cylinder. The inner cylinder comprises a stopper plate which is so located as to face the flange part on outer side of the flange part, and has one or more inclined toe correct surfaces. The outer cylinder comprises a toe adjustment component which has an inclined plane facing the toe correct surface of the stopper plate at the flange part. The toe adjustment component comprises a projection which projects to an outer side with respect to an outer peripheral edge of the flange part, and the elastic body is filled between the toe correct surface and the inclined plane.SELECTED DRAWING: Figure 1

Description

The present invention relates to a toe collect bush or the like for connecting a trailing arm in a trailing arm type suspension to a vehicle body in a swingable manner.

Conventionally, a trailing arm type suspension is known as one of suspension types for vehicles. In the trailing arm type suspension, the trailing arms are arranged at predetermined positions on the left and right of the vehicle body so as to extend in the vehicle front-rear direction. The trailing arm is swingably attached to the vehicle body via a bush attached to one end side, and a spindle for attaching a tire is provided on the other end side. The left and right trailing arms are connected by a twist beam between the vehicle body and the tire. In the case of such a suspension, the toe angles of the left and right tires change due to the lateral force during cornering, which makes the vehicle body unstable. In order to solve this problem, Patent Document 1 discloses a technique called a to collect bush or the like, which has a function of correcting the toe angle so that the toe angle maintains a predetermined angle.

JP, 2007-313934, A

However, the toe control bush disclosed in Patent Document 1 can correct the toe angle to some extent, but has a problem in that a sufficient toe angle correction force, so-called toe correct force cannot be obtained.
Therefore, it is an object of the present invention to provide a toe collect bush or the like capable of improving the toe collect force with respect to a torsion input during cornering in a trailing arm type suspension.

As a structure of the toe collect bush for solving the above-mentioned problem, there is a toe collect bush connecting the front end side of the trailing arm extending along the front-rear direction of the vehicle body and the vehicle body, and an inner cylinder fixed to the vehicle body. An outer cylinder arranged on the outer peripheral side of the inner cylinder and fixed to the trailing arm; a flange portion provided on one end side of the outer cylinder and extending in one of the radial directions of the outer cylinder; A stopper plate having an elastic body that elastically connects the cylinder and the inner cylinder, the inner cylinder being arranged to face the flange portion outside the flange portion, and having one or more inclined toe-collect surfaces. The outer cylinder is provided with a toe adjusting member having an inclined surface facing the toe collecting surface of the stopper plate on the flange portion, and the toe adjusting member is provided with a protruding portion protruding outward from the outer peripheral edge of the flange portion. An elastic body was filled between the collect surface and the inclined surface.
According to this configuration, it is possible to improve the toe collection force with respect to the twist input during cornering.
Further, as the structure of the toe collect bush, the protruding portion is provided along the radially outer edge portion, or is continuous with the radially outer edge portion and is provided along the edge portion along the extending direction of the flange portion, The protrusion may be bent outside the outer peripheral edge.
A trailing arm suspension including the toe collect bush according to claim 1, wherein the toe collect bush is attached such that one direction in which the flange portion extends is directed in the vehicle front-rear direction. Further, the protruding portion of the toe collect bush is provided along the edge portion of the flange portion located on the front side of the vehicle body, the lower portion from the edge portion located on the front side of the vehicle body, or the upper portion including the edge portion on the front side of the vehicle body. It may be provided along the edge reaching the side.

It is a schematic structure figure of a trailing arm type suspension. It is an axial sectional view of a toe collect bush. FIG. 3 is a plan view of one end side of the toe collect bush. It is a top view of the other end side of the toe collect bush. It is a top view of a toe adjustment member, and a cross section sectional view containing the 1st toe correct surface. It is a cross-sectional view including a first toe-collect surface showing another form of the protruding portion.

Hereinafter, the present invention will be described in detail through embodiments of the invention, but the following embodiments do not limit the invention according to the claims, and all combinations of the features described in the embodiments are the inventions. It is not always essential to the solving means, and includes configurations that are selectively adopted.

FIG. 1 is a schematic diagram showing an example in which a trailing arm type suspension is applied to a rear suspension.
As shown in FIG. 1, the trailing arm suspension includes a twist beam 11 arranged in the left-right direction in the width direction of the vehicle body and both longitudinal ends of the twist beam 11 in the longitudinal direction of the vehicle body. A pair of trailing arms 12 and 13 arranged, reinforcing members 14 and 15 attached to these connecting portions, and spindles protruding toward the outside of the vehicle at the rear ends of the trailing arms 12 and 13. The toe collect bushes 100 and 101 are attached to the front end sides of the trailing arms 12 and 13 of the suspension including 16 and 17, and these toe collect bushes 100 and 101 swing the pair of trailing arms 12 and 13 toward the vehicle body. Connect movably.

The trailing arms 12 and 13 include a bush press-fitting portion into which the toe collect bushes 100 and 101 are press-fitted on the front end side and a spindle 16; 17 onto which a tire (not shown) is rotatably mounted to the rear end side. It is attached to the vehicle body through the press-fitted toe-collect bushes 100, 101.

A bracket for attaching the trailing arms 12 and 13 is attached to the vehicle body. Each bracket is composed of a pair of an inner bracket 20; 21 provided on the vehicle body centerline side and an outer bracket 18; 19 provided on the outer side. The brackets 18, 20; 19, 21 are provided so as to be separated from each other with a size capable of holding the inner cylinders of the toe collect bushes 100, 101, and the respective trailing arms 12; 13 extend along the front-rear direction of the vehicle body.

The trailing arms 12 and 13 can be swung toward the vehicle body side by inserting the bolts 36 through the outer brackets 18 and 19, the inner cylinders of the to collect bushes 100 and 101 and the inner brackets 20 and 21, and tightening the nuts 37. Be connected.

2 is an axial sectional view of the toe collect bush, FIG. 3 is a plan view of one end side of the toe collect bush, and FIG. 4 is a plan view of the other end side of the toe collect bush. In the following description, the toe collect bush 101 mounted on the trailing arm 13 on the left side of the vehicle body is used for description. The toe collect bush 100 mounted on the right trailing arm 12 has the same structure with the right and left opposite directions, and the toe collect bush 101 mounted on the left trailing arm 13 is horizontally reversed. Pressed and fixed. That is, the same thing is applied to the toe collect bushes 101; 100 according to the present embodiment. In the following description, the toe collect bushes 101; 100 will be described as the toe collect bushes 30.

The toe collect bush 30 is roughly a cylindrical inner cylinder 34, a cylindrical outer cylinder 32 arranged on the outer peripheral side of the inner cylinder 34, and a rubber shape that elastically connects the outer cylinder 32 and the inner cylinder 34. An elastic body (hereinafter simply referred to as an elastic body) 44 is provided. The length of the inner cylinder 34 in the axial direction is set longer than the length of the outer cylinder 32 in the axial direction. The outer cylinder 32 is arranged substantially concentrically with the axis S of the inner cylinder 34, and the ends of the inner cylinder 34 project outward from the respective ends of the outer cylinder 32.

The elastic body 44 is disposed between the outer cylinder 32 and the inner cylinder 34, and is vulcanized and adhered to the inner peripheral surface of the outer cylinder 32 and the outer peripheral surface of the inner cylinder 34, respectively, and the outer cylinder 32 and the inner cylinder 34 are integrated. Turn into. The details of the elastic body 44 will be described later.

As shown in FIG. 2, the outer cylinder 32 includes a flange portion 38 on one end side (the other end side in the drawing). As shown in FIG. 3, the flange portion 38 has a flat plate-shaped first support portion 40 and a first support portion 40 that extend mainly in one radial direction of the axis S when the toe-collect bush 30 is viewed in the axial direction. The flat plate-shaped second support portion 42 that extends in the opposite direction to the extension direction of the first support portion 40, and the first support portion 40 and the second support portion 42 that extend in the direction orthogonal to the one direction And an overhanging portion 43 formed so as to be connected. The one direction means any one direction in which one straight line passing through the axis S extends. In the following description, one direction is called an extending direction, and a direction orthogonal to this is called a crossing direction.

As shown in FIG. 2, the first support portion 40 extends radially outward with a predetermined angle with respect to the axis S, and the second support portion 42 extends radially outward with respect to the axis S. Extend in the direction. Edges 40a and 42a extending along the circumferential direction of the axis S on the radially outer sides of the first support portion 40 and the second support portion 42 are formed, for example, in an arc shape. As shown in FIG. 3, the first support portion 40 and the second support portion 42 are set to have a width wider than the diameter dimension of the outer cylinder 32. The overhanging portion 43 overhangs in the intersecting direction from the outer circumference of the outer cylinder 32, and connects the regions of the first support portion 40 and the second supporting portion 42 projecting in the crossing direction from the outer circumference of the outer cylinder 32.

As shown in FIG. 2, a toe adjusting member 45 is provided on the outer side of the flange portion 38 in the axial direction. The toe adjusting member 45 is formed such that the outer diameter shape in plan view is substantially the same as the outer diameter shape in plan view of the flange portion 38, and a part thereof protrudes when the flange portion 38 is overlapped. The toe adjusting member 45 is formed by bending a metal plate such as a steel plate into a predetermined shape by pressing or the like. The toe adjusting member 45 includes a first toe adjusting portion 46 provided corresponding to the first supporting portion 40 and a second toe adjusting portion 48 provided corresponding to the second supporting portion 42. The toe adjusting member 45 is fixed, for example, by welding along the outer peripheral edge 38z of the flange portion 38.

FIG. 5 is a plan view of the toe adjusting member 45 and a cross-sectional view in the cross direction including the first toe collect surface 54 of the first toe adjusting portion 46. As shown in FIGS. 2 and 5, in the state where the toe adjusting member 45 is attached to the flange portion 38, the first toe adjusting portion 46 extends along the axis line S toward the other end side toward the other end. A first toe collect surface 54 is formed so as to be inclined from the side and extend at a predetermined angle with respect to the axis S. The first toe correct surface 54 is recessed in an arc shape in the intersecting direction as shown in FIG. 5B, and is formed in an inclined shape in the extending direction as shown in FIG. As shown in FIG. 5A, the first toe correct surface 54 extends for a predetermined length in the extending direction by the outer diameter dimension of the outer cylinder 32, and is formed, for example, in a spherical shape as a whole. The toe adjusting member 45 including the outer peripheral side range of the first toe adjusting portion 46 in which the first toe correct surface 54 is formed is provided with the outer peripheral extending portion 47 extending in the direction orthogonal to the axis S. The outer peripheral extension portion 47 includes a protruding portion 49 that protrudes outward in the radial direction from the outer peripheral edge 38z of the flange portion 38 when attached to the flange portion 38.

The projecting portion 49 is, for example, an edge portion 40a of the first support portion 40 of the flange portion 38 and edge portions 40b and 40b that are continuous with both sides of the edge portion 40a and extend along the extending direction, and further the first support portion. 40 is formed in a range including the edge portions 43a; 43a of the pair of overhang portions 43 formed continuously with 40. In this embodiment, the protrusion 49 is formed so as to sandwich the inner cylinder 34. In this way, by providing the toe adjusting member 45 with the protruding portion 49 and integrating it with the flange portion 38, the rigidity of the toe adjusting member 45 can be increased. The amount of protrusion of the protrusion 49 from the outer peripheral edge 38z of the flange 38 may be set appropriately, for example, 10 mm.

The second toe adjusting unit 48 extends along the axis S toward the other end side outwardly, so that the second toe collect surface 60 extends at a predetermined angle with respect to the axis S so that the distance from the side of the axis S approaches. Is formed.
As shown in FIG. 5A, the second toe correct surface 60 is extended to a predetermined length in the intersecting direction with a dimension smaller than the outer diameter of the outer cylinder 32 while maintaining the inclined state shown in FIG. It is formed. The first toe collect surface 54 and the second toe collect surface 60 are formed substantially in parallel, for example.

As shown in FIGS. 2 and 4, the inner cylinder 34 includes a stopper plate 62 that faces the flange portion 38 on the outer side of the flange portion 38 on the other end side in the axial direction. The stopper plate 62 is fixed to the outer peripheral surface of the inner cylinder 34 by welding or the like, and is integrated with the inner cylinder 34. The stopper plate 62 is formed by, for example, pressing a metal plate such as a steel plate.
The stopper plate 62 includes a first inclined portion 64 that is substantially parallel to the first toe correcting surface 54 of the first toe adjusting portion 46, and a second inclined portion substantially parallel to the second toe correcting surface 60 of the second toe adjusting portion 48. And 66. The term “substantially parallel” as used herein includes a state of being substantially parallel, and the first toe correction surface 54 and the first inclined portion 64 of the first toe adjusting section 46 and the second toe adjusting section 48 of the second toe adjusting section 48. This means that the collect surface 60 and the second inclined portion 66 may face each other in an inclined state.

The first to-collect surface 54 and the second to-collect surface 60 are set such that the inclination angles θ1 and θ2 with respect to the radial direction around the axis S are in the range of 30° to 50°. In the present embodiment, the inclination angles θ1 and θ2 are set to about 45°, respectively.

The first toe correct surface 54 and the second toe collect surface 60 have, for example, a width along the radial direction centered on the axis S larger than the outer diameter of the inner cylinder 34. In addition, the first tough corrected surface 54 may be formed in, for example, a substantially fan shape whose projected shape along the axial direction becomes wider from the inner peripheral side toward the outer peripheral side. On the other hand, the second toe correct surface 60 is formed, for example, in an arc shape in which an inner peripheral end and an outer peripheral end in a projected shape along the axial direction are curved around the axis S, and both side ends are parallel to each other. , Is formed in a straight line extending along the radial direction.

The elastic body 44 is filled between the first toe-collect surface 54 and the first inclined portion 64, and the first connecting portion 68 and between the second toe-collect surface 60 and the second inclined portion 66. The second connecting portion 70 is integrally formed. The first connecting portion 68 is vulcanized and adhered to the first toe-collect surface 54 and the first inclined portion 64, and elastically connects the first toe-collect surface 54 and the first inclined portion 64. The second connecting portion 70 is vulcanized and adhered to the second toe-collect surface 60 and the second inclined portion 66, respectively, and elastically connects the second toe-collect surface 60 and the second inclined portion 66.

As shown in FIG. 2, the elastic body 44 that connects the inner cylinder 34 and the outer cylinder 32 is formed with a first curled portion 72 and a second curled portion 74 that extend along the axis S direction. The first and second cursed portions 72 and 74 respectively extend from the outer end surface of the elastic body 44 to the inner side, for example, to the vicinity of the toe adjustment member 45. The first cursed part 72 and the second cursed part 74 are provided at positions facing each other with the inner cylinder 34 interposed therebetween, and are aligned with the extending directions of the first support part 40 and the second support part 42 of the flange part 38. Will be placed.

In the above-described toe collect bush 30, the extending direction of the first supporting portion 40 and the second supporting portion 42 provided as the flange portion 38 is made to coincide with the longitudinal direction of the trailing arm 12, and the trailing arm 13 is not shown. It is press-fitted and fixed in the bush press-fit part. Further, the trailing arm 12 on the right side is similarly press-fitted and fixed.

Hereinafter, the operation of the toe collect bush 30 according to the present embodiment will be described. As shown in FIG. 1, when trailing arms 12 and 13 in a trailing arm type rear suspension are subjected to cornering force (lateral load) along the width direction during cornering, the bounding or rebounding causes a change in vertical load. When input, a torsion input is generated in the toe collect bush 30. At this time, in the toe collect bush 30, the elastic body 44 is elastically deformed along the axial direction by the lateral load from the trailing arms 12 and 13, and a part of this lateral load is elastically deformed by the first connecting portion 68. The first toe collecting surface 54 and the first inclined portion 64 connected to each other generate a component force in a component force (front and rear load) along the vehicle front-rear direction, and are elastically coupled by the second connector 70. The second toe correction surface 60 and the second inclined portion 66 generate a component force (longitudinal load) along the longitudinal direction of the vehicle. Further, on the outer peripheral side of the first toe adjusting portion 46 having the first toe collect surface 54, the protruding portion 49 protruding outward from the outer peripheral edge of the first supporting portion 40 of the flange portion 38 is provided, and the toe adjusting member 45 of the toe adjusting member 45 is provided. Since the rigidity is improved, the deflection of the toe adjusting member 45 can be reduced even if there is an input (twisting input) about the extension axis of the trailing arms 12 and 13, so that the amount of deformation of the elastic body 44 is restricted. As a result, the amount of toe collection can be increased.

For example, when a bound (upward load) load is input while receiving a lateral load shown in F of FIG. 1, the left toe correct bush 30 (101) and the right toe collect bush 30 (100) are opposite to each other. Load is generated on the left toe collect bush 30 in the front-rear direction on the left side, and on the right side toe collect bush 30 in the front-rear direction in the front-rear direction. The vertical load on the lower side in the vertical direction is generated on the upper and right side toe correct bushes 30, so that the left and right tires can be operated to lean toward the toe-in side.

As described above, since the toe adjusting member 45 is provided with the protrusion 49 that protrudes outside the outer peripheral edge 38z of the flange portion 38, the rigidity of the toe adjusting member 45 is improved, so that the toe adjusting member 45 can be applied to the longitudinal load. It is possible to increase the amount of toe collection when the torsion when the vertical load is generated is input to the toe collect bush 30.

In addition, in the present embodiment, the description has been given assuming that the protruding portion 49 is provided in a range that sandwiches the inner cylinder 34 along the outer peripheral edges of the first supporting portion 40 and the overhanging portion 43, but is not limited to this, and The protrusion 49 may be formed in the outer peripheral edge forming the first support portion 40, for example, in a range corresponding to the edge portion 40a and the edge portions 40b; 40b continuous with the edge portion 40a, and the above-described first support. In addition to the edge portion 40a forming the portion 40 and the edge portions 40b; 40b continuous on both sides thereof, the edge portions 43a; 43a of the overhang portion 43 continuous with the edge portions 40b; 40b, the edge portion 43a of the overhang portion 43. It may be formed in a range up to an edge extending along the extending direction of the second support portion 42 continuous with 43a.
Further, although the protrusion 49 is formed so as to be symmetrical on both sides of the first support 40, that is, in the intersecting direction shown in FIG. 3, it may be formed on only one side. In this case, it is preferable that when the tough collect bush 30 is attached to the vehicle body, the projecting portion 49 that continuously extends from the edge portion 40a of the first support portion 40 is arranged below the vehicle body.
Further, as shown in FIG. 6, the outer peripheral extension portion 47 may be formed by bending the protruding portion 49 so as to protrude to the outside of the outer peripheral edge 38z of the flange portion 38. By bending the protrusion 49, the rigidity of the toe adjusting member 45 can be further improved, and the amount of toe collection when bound or rebounded can be increased.

In the above embodiment, the axis S is adjusted so that the first toe correct surface 54 and the corresponding first inclined portion 64, the second toe collect surface 60 and the corresponding second inclined portion 66 are corrected in the toe-in direction. Although it is formed to be inclined with respect to, it is not limited to this, and it is also possible to correct in the toe-out direction by setting it in the opposite direction.

11 twist beams, 12, 13 trailing arms,
30 toe collect bush, 32 outer cylinder, 34 inner cylinder, 38 flange part,
44 (rubber-like) elastic body, 45 toe adjusting member, 46 first toe adjusting portion,
48 second toe adjusting portion, 49 protruding portion, 54 first toe collecting surface,
60 second toe correction surface, 62 stopper plate, 64 first inclined portion,
66 second inclined portion, 68 first connecting portion (elastic body), 70 second connecting portion (elastic body),
72 First cursed part, 74 Second cursed part.

Claims (7)

A toe collect bush that connects the front end side of the trailing arm extending along the front-rear direction of the vehicle body and the vehicle body,
An inner cylinder fixed to the vehicle body,
An outer cylinder arranged on the outer peripheral side of the inner cylinder and fixed to the trailing arm,
A flange portion provided on one end side of the outer cylinder and extending in one of the radial directions of the outer cylinder,
An elastic body that elastically connects the outer cylinder and the inner cylinder,
The inner cylinder is
A stopper plate disposed on the outer side of the flange portion so as to face the flange portion and having one or more inclined toe-collect surfaces,
The outer cylinder is
The flange portion is provided with a toe adjusting member having an inclined surface facing the toe collecting surface of the stopper plate,
The toe adjusting member includes a protruding portion that protrudes outward from the outer peripheral edge of the flange portion,
A toe collection bush, wherein the elastic body is filled between the toe collection surface and the inclined surface. The toe-collect bush according to claim 1, wherein the protruding portion is provided along an edge portion that extends radially outward of the flange portion. The said protrusion part is continuous with the edge part of the radial direction outer side of the said flange part, and was provided along the edge part along the extension direction of the flange part, The claim 1 or claim 2 characterized by the above-mentioned. To collect bush. The toe-collect bush according to any one of claims 1 to 3, wherein the protruding portion is bent outside the outer peripheral edge. A trailing arm type suspension comprising the toe collect bush according to claim 1,
The toe collect bush is
A trailing arm type suspension characterized in that one of the extending directions of the flange is attached to the front-rear direction of the vehicle body. The trailing arm type suspension according to claim 5, wherein the projecting portion is provided along an edge portion of the flange portion located on the front side of the vehicle body. The projecting portion is provided along an edge portion from an edge portion located on the vehicle body front side of the flange portion to a lower side, or an edge portion from the upper side to the lower side including an edge portion on the vehicle body front side. The trailing arm suspension according to item 5.

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