Mounting structure of vehicle suspension arms
The vehicle suspension arm mounting structure addresses the challenge of maintaining stability and preventing bush cracking by using a stopper and elastic members to control arm displacement, ensuring stable and noise-free operation.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MAZDA MOTOR CORP
- Filing Date
- 2023-02-20
- Publication Date
- 2026-05-15
AI Technical Summary
Existing vehicle suspension systems face challenges in achieving both reduced compliance of elastic bushes to enhance driving stability and prevent cracking, while also avoiding increased costs and vehicle size, particularly during high-speed maneuvers.
A mounting structure for a vehicle suspension arm that includes a cylindrical bracket, an elastic bush, and a stopper, where the stopper contacts the inner circumference of the bracket when the arm displaces a predetermined distance, and elastic members provide reaction forces to prevent excessive input to the elastic bush, thereby maintaining stability and preventing noise.
The solution effectively suppresses excessive input to the elastic bush, ensuring desired driving stability and handling stability while preventing noise and reducing the risk of bush cracking, without increasing costs or vehicle size.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to an attachment structure of a vehicle suspension arm.
Background Art
[0002] Conventionally, in a vehicle suspension, by providing an elastic bush that increases compliance at the connection part of the suspension arm to the vehicle body, the damping property of vibrations transmitted from the suspension arm to the vehicle body during vehicle running is enhanced, and a good NVH performance can be obtained. For example, in the support structure of the suspension arm described in Patent Document 1, a shaft support portion extending rearward of the vehicle body is provided at the rear end on the vehicle body side of the lower arm constituting the suspension, and this shaft support portion is inserted into the inner cylinder of a cylindrical rubber bush, and the outer cylinder of the rubber bush is fixed to a bracket on the vehicle body side. Thereby, the lower arm is connected to the vehicle body.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] On the other hand, in order to improve running stability, it is desirable to suppress the compliance of the elastic bush so that the alignment of the suspension does not change excessively. However, if the compliance of the elastic bush is decreased, the elastic bush becomes hard, and there is a possibility that the elastic bush may crack when there is a large input from the suspension arm due to climbing over a step during high-speed running. Also, in order to achieve both a decrease in compliance and an improvement in durability, it is conceivable to increase the diameter of the elastic bush, but in this case, it causes an increase in the cost of the elastic bush and an increase in the size of the vehicle body side subframe for attaching the elastic bush.
[0005] The present invention was made to solve the problems of the prior art described above, and aims to provide a mounting structure for a vehicle suspension arm that can prevent excessive input to the elastic bush and achieve desired driving stability. [Means for solving the problem]
[0006] To achieve the above objective, the mounting structure for a vehicle suspension arm of the present invention comprises: a cylindrical bracket fixed to the vehicle body and having a central axis in the longitudinal direction of the vehicle body; a cylindrical elastic bush having a central axis in the longitudinal direction of the vehicle body, wherein the outer circumference of the elastic bush is held by the inner circumference of the bracket; an arm that can swing vertically in the vehicle body about an axis extending through the elastic bush in the longitudinal direction of the vehicle body, wherein the rod-shaped rear end extending to the rear of the vehicle body is held by the inner circumference of the elastic bush, and is connected to the bracket via the elastic bush; and a stopper fixed to the rear end of the arm in front of the elastic bush and on the inner circumference side of the bracket, wherein the rear end of the stopper is located behind the vehicle body than the front end of the bracket, and the stopper contacts the inner circumference of the bracket when the rear end of the arm is displaced a predetermined distance in the vehicle width direction.
[0007] In the present invention configured as described above, when an input is applied that moves the rear end of the arm in the vehicle width direction, the stopper contacts the inner circumference of the bracket when the rear end of the arm is displaced by a predetermined distance in the vehicle width direction, thereby suppressing further movement of the rear end of the arm. Therefore, it is possible to achieve the desired driving stability by suppressing the compliance of the elastic bush while preventing excessive input to the elastic bush.
[0008] Furthermore, in the present invention, preferably, the stopper includes a core member fixed to the rear end of the arm in front of the vehicle body relative to the elastic bush, and a first elastic member provided on the outer surface of the core member that faces the inner circumference of the bracket.
[0009] In the present invention configured as described above, a first elastic member is interposed between the core member of the stopper and the inner circumference of the bracket. The reaction force generated in response to the elastic deformation of the first elastic member prevents abrupt changes in handling stability and prevents excessive input to the elastic bush. Furthermore, it prevents the generation of abnormal noise due to contact between the core member and the bracket.
[0010] Furthermore, in the present invention, preferably, the rear end of the arm has a projection that protrudes inward in the vehicle width direction from the inward end of the inner circumference of the bracket, in front of the vehicle body front end of the bracket, and when the rear end of the arm is displaced by a predetermined distance or more to the rear of the vehicle body, the rear end of the projection presses against the front end of the bracket.
[0011] In the present invention configured as described above, when an input is received that moves the rear end of the arm toward the rear of the vehicle body, if the rear end of the arm is displaced by a predetermined distance or more toward the rear of the vehicle body, the rear end of the protruding part presses against the front end of the bracket, thereby suppressing further movement of the rear end of the arm. Therefore, it is possible to achieve the desired driving stability by suppressing the compliance of the elastic bush while preventing excessive input to the elastic bush.
[0012] Furthermore, the present invention preferably includes a second elastic member provided between the rear end of the protruding portion and the front end of the bracket.
[0013] In the present invention configured as described above, a second elastic member is interposed between the rear end of the protruding portion and the front end of the bracket. The reaction force generated in response to the elastic deformation of the second elastic member prevents abrupt changes in handling stability and prevents excessive input to the elastic bush. Furthermore, it prevents the generation of abnormal noise due to contact between the protruding portion and the bracket.
[0014] Furthermore, in the present invention, the stopper has a core member fixed to the rear end of the arm in front of the vehicle body relative to the elastic bush, and a first elastic member provided on the outer surface of the core member facing the inner circumference of the bracket, and the first elastic member and the second elastic member are integrally formed.
[0015] In the present invention configured as described above, a first elastic member is interposed between the core member of the stopper and the inner circumference of the bracket. The reaction force generated in response to the elastic deformation of the first elastic member prevents abrupt changes in handling stability and prevents excessive input to the elastic bush. Furthermore, it prevents the generation of abnormal noise due to contact between the core member and the bracket. Moreover, since the first elastic member and the second elastic member are formed integrally, the manufacturing process of the stopper can be simplified. [Effects of the Invention]
[0016] According to the vehicle suspension arm mounting structure of the present invention, it is possible to prevent excessive input to the elastic bush and achieve desired driving stability. [Brief explanation of the drawing]
[0017] [Figure 1] This is a perspective view showing a mounting structure for a vehicle suspension arm according to an embodiment of the present invention. [Figure 2] This is a plan view of the right front wheel side of a vehicle suspension arm mounting structure according to an embodiment of the present invention, as seen from above the vehicle body. [Figure 3] This is a cross-sectional view of the rear end of the rear arm portion, rear bush, stopper, and bracket of the lower arm according to an embodiment of the present invention, as seen from above the vehicle body. [Figure 4] This is a cross-sectional view along line IV-IV in Figure 2. [Figure 5] This is a perspective view showing a stopper according to an embodiment of the present invention. [Figure 6]A cross-sectional view taken from above the vehicle body for explaining the forces and displacements applied to the rear end portion of the rear arm portion of the lower arm on the right front wheel side, the rear bush, and the stopper when a force is applied to the right front wheel toward the rear of the vehicle body. [Figure 7] A cross-sectional view taken from above the vehicle body for explaining the forces and displacements applied to the rear end portion of the rear arm portion of the lower arm on the right front wheel side, the rear bush, and the stopper when a force is applied to the right front wheel toward the rear of the vehicle body. [Figure 8] A cross-sectional view taken along line VIII-VIII in FIG. 6.
Mode for Carrying Out the Invention
[0018] Hereinafter, with reference to the accompanying drawings, the mounting structure of the vehicle suspension arm according to an embodiment of the present invention will be described.
[0019] First, the overall configuration of the mounting structure of the vehicle suspension arm according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the mounting structure of the vehicle suspension arm according to the present embodiment. FIG. 2 is a plan view of the right front wheel side of the mounting structure of the vehicle suspension arm according to the present embodiment as viewed from above the vehicle body. The vehicle suspension arm shown in FIG. 1 and the like is arranged on the right front wheel side of the vehicle, and "front", "up", "inner", and "outer" indicated by the arrows indicate the front of the vehicle body, the upper side of the vehicle body, the inner side in the vehicle width direction, and the outer side in the vehicle width direction, respectively.
[0020] The mounting structure for the vehicle suspension arm in this embodiment, as shown in Figure 1, is a structure in which the lower arm 6 of the double wishbone type front suspension 4, which connects the vehicle body 1 and the wheels 2, is attached to the vehicle body 1. As shown in Figure 1, the lower arm 6 is an A-type arm having a front arm portion 8 that extends almost in the vehicle width direction and a rear arm portion 10 that extends diagonally forward from the inside outward in the vehicle width direction. The inner end of the front arm portion 8 in the vehicle width direction and the rod-shaped rear end portion 10a of the rear arm portion 10 that extends toward the rear of the vehicle body are attached to the vehicle body 1 at two mounting portions 12 and 14, respectively, and the lower arm 6 can swing in the vertical direction of the vehicle body about an axis that extends in the longitudinal direction of the vehicle body passing through these mounting portions 12 and 14.
[0021] The inward end of the front arm portion 8 in the vehicle width direction is attached to the vehicle body 1 at the front mounting portion 12 via a cylindrical front bush 16. The rear end portion 10a of the rear arm portion 10 is attached to the vehicle body 1 at the rear mounting portion 14 via a cylindrical rear bush 18. The rear bush 18 is held by a cylindrical bracket 20 fixed to the vehicle body 1. Furthermore, the rear end portion 10a of the rear arm portion 10 is provided with a projection 22 that protrudes inward in the vehicle width direction from the front end of the bracket 20 of the vehicle body, in front of the vehicle body.
[0022] The front bushing 16 and the rear bushing 18 are positioned so as to have a central axis in the longitudinal direction of the vehicle body. Each of these bushings provided on the lower arm 6 has a compliance set to achieve an appropriate balance of desired handling stability and NVH performance. Furthermore, in order to ensure handling stability, the front bushing 16 has a relatively smaller compliance than the rear bushing 18.
[0023] A stopper 24 is provided in front of the rear bush 18 and on the inner circumference side of the bracket 20, which is fixed to the rear end 10a of the rear arm portion 10.
[0024] Next, the configuration of the mounting structure for the vehicle suspension arm according to this embodiment will be specifically described with reference to Figures 3 to 5. Figure 3 is a cross-sectional view of the rear end portion 10a of the rear arm portion 10 of the lower arm 6, the rear bush 18, the stopper 24, and the bracket 20 as seen from above the vehicle body, Figure 4 is a cross-sectional view taken along line IV-IV in Figure 2, and Figure 5 is a perspective view showing the stopper 24 according to this embodiment.
[0025] The bracket 20 is formed in a thin-walled cylindrical shape with a central axis in the longitudinal direction of the vehicle body, and a flange portion 20a that extends radially outward is provided at the front end of the vehicle body. This bracket 20 is fixed to the outside of the vehicle body 1 in the vehicle width direction by welding, bolting, or the like.
[0026] The rear bush 18 is a cylindrical elastic bush, comprising a cylindrical outer cylinder 26, an inner cylinder 28 having a smaller diameter than the outer cylinder 26 and positioned on the inner circumference of the outer cylinder 26, and a cylindrical elastic body 30 positioned between the outer cylinder 26 and the inner cylinder 28. The outer cylinder 26, the inner cylinder 28, and the elastic body 30 are fixed to each other by adhesive.
[0027] The outer cylinder 26 and inner cylinder 28 are formed from metal plates, such as steel plates. The elastic body 30 is made of rubber, for example, and is formed to have the necessary radial thickness and axial length to achieve spring and damping characteristics corresponding to the expected load input. Furthermore, as shown in Figure 3, recesses can be formed at both axial ends of the elastic body 30, or regulating members can be embedded inside the elastic body 30 to restrict its deformation, depending on the desired characteristics.
[0028] The rear bush 18, configured as described above, is press-fitted into the inner circumference of the bracket 20 from the rear of the vehicle body along the central axis direction of the bracket 20 and is held in place by the inner circumference of the bracket 20. As shown in Figure 3, the entire rear bush 18 does not necessarily have to be press-fitted into the bracket 20, but the load-bearing portion of the rear bush 18 (the axial center of the elastic body 30 in the example of Figure 3) is positioned inside the bracket 20.
[0029] The rear end 10a of the rear arm portion 10 is formed in the shape of a round bar extending toward the rear of the vehicle body. A projection 22 is provided on the front side of this rear end 10a that protrudes inward in the vehicle width direction. The length of the projection 22 in the vehicle width direction is set such that when an input is received from the wheel 2 to the suspension arm and the rear end 10a of the rear arm portion 10 moves to its maximum extent inward in the vehicle width direction, the inward end of the projection 22 in the vehicle width direction does not interfere with the vehicle body 1, and the projection 22 and the inward portion of the flange portion 20a of the bracket 20 in the vehicle width direction overlap when viewed from the front-rear direction of the vehicle body.
[0030] A stopper 24 is fitted and fixed to the rear end 10a of the rear arm portion 10 so as to be adjacent to the rear side of the protruding portion 22 of the rear arm portion 10. Furthermore, the rear end 10a on the rear side of the vehicle body beyond the stopper 24 is press-fitted into the inner circumference of the inner cylinder 28 of the rear bush 18 from the front side of the vehicle body and held in place by the inner circumference of the inner cylinder 28. As shown in Figure 3, the rear end 10a of the rear arm portion 10 does not have to be press-fitted into the entire rear bush 18, but the rear end 10a of the rear arm portion 10 is press-fitted into the inner cylinder 28 of the rear bush 18 to a position where the rear end 10a of the rear arm portion 10 and the load-receiving portion of the rear bush 18 overlap.
[0031] The stopper 24 restricts the movement of the rear end 10a of the rear arm portion 10 in the vehicle width direction, thereby suppressing excessive deformation of the rear bush 18. The stopper 24 is fixed to the rear end 10a of the rear arm portion 10 such that the rear end of the stopper 24 is located further forward of the vehicle body than the rear bush 18 and on the inner circumference side of the bracket 20, and further rearward of the vehicle body than the front end of the bracket 20.
[0032] The stopper 24 includes a core member 32 having a cylindrical shape with a central axis in the longitudinal direction of the vehicle body, with the upper and lower sides of the vehicle body cut off, and an elastic member 34 provided on the outer circumference of the core member 32 (i.e., the outer surface of the core member 32 that faces the inner circumference of the bracket 20).
[0033] The core member 32 is formed from a metal such as an aluminum alloy. The stopper 24 is fixed to the rear end 10a of the rear arm portion 10 by press-fitting the rear end 10a of the rear arm portion 10 into the inner circumference of the core member 32. The inner and outer portions of the outer circumference of the core member 32 in the vehicle width direction are formed to have a curved surface that follows the inner circumference of the bracket 20. In Figure 3, the core member 32 is solid except for the central hole into which the rear end 10a of the rear arm portion 10 is inserted, but weight reduction may be achieved by forming appropriate cutouts while ensuring the necessary strength.
[0034] The elastic member 34 is formed, for example, from rubber and has an outer peripheral portion 34a that covers the outer circumference of the core member 32, and an end face portion 34b that extends from the front and inward end of the outer peripheral portion 34a in the vehicle width direction along the front end face of the core member 32 and protrudes inward in the vehicle width direction from the front and inward end of the outer peripheral portion 34a of the elastic member 34. In particular, the inward end in the vehicle width direction of the end face portion 34b protrudes inward in the vehicle width direction to the same position as the inward end in the vehicle width direction of the protruding portion 22 of the rear arm portion 10. These outer peripheral portion 34a and end face portion 34b are formed integrally, with the outer peripheral portion 34a being bonded to the outer circumference of the core member 32 and the end face portion 34b being bonded to the front end face of the core member 32.
[0035] The inner and outer thicknesses in the vehicle width direction of the outer peripheral portion 34a of the elastic member 34 are set to have desired reaction force characteristics when an input is received from the wheel 2 to the suspension arm and the rear end portion 10a of the rear arm portion 10 moves in the vehicle width direction, causing the outer peripheral portion 34a of the elastic member 34 to be pressed against the inner circumference of the bracket 20, with the inner thickness in the vehicle width direction being greater than the outer thickness in the vehicle width direction.
[0036] The radius of curvature of the outer circumference portion 34a of the elastic member 34 is smaller than the radius of curvature of the inner circumference of the bracket 20. As a result, when an input is received from the wheel 2 to the suspension arm and the rear end portion 10a of the rear arm portion 10 moves in the vehicle width direction, the outer circumference portion 34a of the elastic member 34 is pressed against the inner circumference of the bracket 20, the contact area between the outer circumference portion 34a of the elastic member 34 and the inner circumference of the bracket 20 gradually increases, and the reaction force generated by the elastic deformation of the outer circumference portion 34a of the elastic member 34 gradually increases.
[0037] Furthermore, the thickness of the end face portion 34b of the elastic member 34 is set to have a desired reaction force characteristic when the front end face of the end face portion 34b contacts the rear end face of the protruding portion 22 of the rear arm portion 10 when the stopper 24 is fixed to the rear end portion 10a of the rear arm portion 10, and when an input is received from the wheel 2 to the suspension arm and the rear end portion 10a of the rear arm portion 10 moves to the rear of the vehicle body, causing the end face portion 34b of the elastic member 34 to be sandwiched between the rear end face of the protruding portion 22 of the rear arm portion 10 and the front end face of the bracket 20.
[0038] Next, the operation of the mounting structure for the vehicle suspension arm according to this embodiment will be explained with reference to Figures 6 to 8. Figure 6 is a cross-sectional view taken from above the vehicle body to illustrate the force and displacement applied to the rear end 10a of the rear arm portion 10, the rear bush 18, and the stopper 24 of the lower arm 6 on the right front wheel side when a force is applied to the right front wheel toward the rear of the vehicle body. Figure 7 is a cross-sectional view taken from above the vehicle body to illustrate the force and displacement applied to the rear end 10a of the rear arm portion 10, the rear bush 18, and the stopper 24 of the lower arm 6 on the right front wheel side when a stronger force is applied to the right front wheel toward the rear of the vehicle body than in the example in Figure 6. Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 6.
[0039] When the vehicle is in motion, a force is applied to the right wheel 2 towards the rear of the vehicle body, such as when it goes over a bump in the road surface. When this force is transmitted to the lower arm 6 on the right front wheel side, a moment is generated that rotates the lower arm 6 backward around the front mounting part 12 as an axis. As a result, as shown by the white arrow in Figure 6, a force acts that moves the rear end 10a of the rear arm portion 10 inward in the vehicle width direction. When this force is transmitted from the rear end 10a of the rear arm portion 10 to the rear bush 18, the rear end 10a of the rear arm portion 10 moves inward in the vehicle width direction, and at the same time, the inward portion of the elastic body 30 of the rear bush 18 in the vehicle width direction is compressed, and the outward portion in the vehicle width direction is stretched. The reaction force generated in response to the elastic deformation of the elastic body 30 at this time gradually suppresses the movement of the rear end 10a of the rear arm portion 10, i.e., the rotation of the lower arm 6, thus preventing abrupt changes in handling stability.
[0040] As the deformation of the elastic body 30 increases and the rear end 10a of the rear arm portion 10 moves further inward in the vehicle width direction, the outer peripheral portion 34a of the elastic member 34 of the stopper 24 comes into contact with the inner circumference of the bracket 20. If the rear end 10a of the rear arm portion 10 moves further inward in the vehicle width direction from there, the outer peripheral portion 34a of the elastic member 34 of the stopper 24 is compressed between the inner circumference of the bracket 20 and the outer circumference of the core member 32. The reaction force generated in response to the elastic deformation of the outer peripheral portion 34a of the elastic member 34 at this time further suppresses the movement of the rear end 10a of the rear arm portion 10, i.e., the rotation of the lower arm 6, thereby preventing abrupt changes in handling stability and preventing excessive deformation of the elastic body 30 of the rear bush 18. In addition, since the elastic member 34 is interposed between the core member 32 of the stopper 24 and the bracket 20, the generation of abnormal noise due to contact between the core member 32 and the bracket 20 can also be prevented.
[0041] Furthermore, when the vehicle is traveling at high speed, a relatively large force is applied to the right wheel 2 towards the rear of the vehicle body, such as when it crosses a bump in the road surface. When this force is transmitted to the lower arm 6 on the right front wheel side, in addition to a moment that rotates the lower arm 6 backward around the front mounting portion 12 as an axis, a force is generated that moves the entire lower arm 6 towards the rear of the vehicle body. As a result, as shown by the white arrows in Figure 7, a force acts that moves the rear end 10a of the rear arm portion 10 inward in the vehicle width direction and towards the rear of the vehicle body. When this force is transmitted from the rear end 10a of the rear arm portion 10 to the rear bush 18, the rear end 10a of the rear arm portion 10 moves inward in the vehicle width direction and towards the rear of the vehicle body, and the inward portion of the elastic body 30 of the rear bush 18 in the vehicle width direction is compressed, the outward portion in the vehicle width direction is stretched, and furthermore, the inner cylinder 28 side of the elastic body 30 protrudes further towards the rear of the vehicle body than the outer cylinder 26 side. The reaction force generated in response to the elastic deformation of the elastic body 30 at this time gradually suppresses the movement of the rear end 10a of the rear arm portion 10, that is, the rotation of the lower arm 6 and its movement toward the rear of the vehicle body, thereby preventing abrupt changes in handling stability.
[0042] As the deformation of the elastic body 30 increases and the rear end portion 10a of the rear arm portion 10 moves further inward in the vehicle width direction and towards the rear of the vehicle body, the outer peripheral portion 34a of the elastic member 34 of the stopper 24 comes into contact with the inner circumference of the bracket 20, and the rear end surface of the end face portion 34b of the elastic member 34 comes into contact with the front end surface of the bracket 20. From there, as the rear end portion 10a of the rear arm portion 10 moves further inward in the vehicle width direction and towards the rear of the vehicle body, the end face portion 34b of the elastic member 34 of the stopper 24 is compressed between the rear end surface of the protrusion 22 of the rear arm portion 10 and the front end surface of the bracket 20. The reaction force generated in response to the elastic deformation of the outer peripheral portion 34a and end face portion 34b of the elastic member 34 at this time further suppresses the movement of the rear end portion 10a of the rear arm portion 10, i.e., the rotation of the lower arm 6 and its movement toward the rear of the vehicle body. This prevents abrupt changes in handling stability and also prevents excessive deformation of the elastic body 30 of the rear bush 18. Furthermore, since the elastic member 34 is interposed between the core member 32 of the stopper 24 and the protruding portion 22 of the rear arm portion 10 and the bracket 20, it is also possible to prevent the generation of abnormal noise due to contact between the core member 32 and the protruding portion 22 and the bracket 20.
[0043] Furthermore, the inner and outer portions of the outer circumference of the stopper 24 in the vehicle width direction are formed to have a curved surface that follows the inner circumference of the bracket 20. Therefore, even if the stopper 24 rotates about the vehicle's longitudinal direction as a pivot point due to the vertical oscillation of the lower arm 6, as shown in Figure 8, similar reaction force characteristics are obtained when the outer circumference portion 34a of the elastic member 34 of the stopper 24 is pressed against the inner circumference of the bracket 20.
[0044] Next, further modifications of embodiments of the present invention will be described. First, in the embodiment described above, a structure in which the lower arm 6 of a double wishbone type front suspension 4 is attached to the vehicle body 1 was explained as an example. However, the present invention can also be applied to upper arms, double wishbone type rear suspensions, or other types of suspensions (for example, multi-link type, semi-trailing arm type, strut type, etc.).
[0045] Furthermore, although the above-described embodiment explained that the outer peripheral portion 34a and the end face portion 34b of the elastic member 34 of the stopper 24 are formed integrally, the outer peripheral portion 34a and the end face portion 34b may be formed as separate members.
[0046] Furthermore, in the above-described embodiment, a protrusion 22 is provided at the rear end 10a of the rear arm portion 10. However, if the movement of the rear end 10a of the rear arm portion 10 toward the rear of the vehicle body can be restricted by other means, and excessive deformation of the rear bush 18 can be suppressed, the protrusion 22 may be omitted.
[0047] Next, the effects of the mounting structure for a vehicle suspension arm according to the embodiments of the present invention described above and modified embodiments thereof will be explained.
[0048] First, the mounting structure for the vehicle suspension arm includes a stopper 24 fixed to the rear end 10a of the rear arm portion 10, located in front of the rear bush 18 and on the inner circumference side of the bracket 20. The rear end of the stopper 24 is located behind the front end of the bracket 20, and when the rear end 10a of the rear arm portion 10 is displaced a predetermined distance in the vehicle width direction, the stopper 24 contacts the inner circumference of the bracket 20. Therefore, when there is an input that moves the rear end 10a of the rear arm portion 10 in the vehicle width direction, if the rear end 10a of the rear arm portion 10 is displaced a predetermined distance in the vehicle width direction, the stopper 24 contacts the inner circumference of the bracket 20, thereby suppressing further movement of the rear end 10a of the rear arm portion 10. Thus, it is possible to achieve the desired driving stability by suppressing the compliance of the rear bush 18 while preventing excessive input to the rear bush 18.
[0049] Furthermore, since the outer peripheral portion 34a of the elastic member 34 is interposed between the core member 32 of the stopper 24 and the inner circumference of the bracket 20, the reaction force generated in accordance with the elastic deformation of the outer peripheral portion 34a of the elastic member 34 prevents abrupt changes in handling stability and prevents excessive input to the rear bush 18. In addition, it is possible to prevent the generation of abnormal noise due to contact between the core member 32 and the bracket 20.
[0050] Furthermore, when an input is received that moves the rear end 10a of the rear arm portion 10 toward the rear of the vehicle body, if the rear end 10a of the rear arm portion 10 is displaced by a predetermined distance or more toward the rear of the vehicle body, the rear end of the protruding portion 22 presses against the front end of the bracket 20, thereby suppressing further movement of the rear end 10a of the rear arm portion 10. Therefore, by suppressing the compliance of the rear bush 18, it is possible to achieve the desired driving stability while preventing excessive input to the rear bush 18.
[0051] Furthermore, since the end face portion 34b of the elastic member 34 is interposed between the rear end of the protrusion 22 and the front end of the bracket 20, the reaction force generated in accordance with the elastic deformation of the end face portion 34b of the elastic member 34 prevents abrupt changes in handling stability and prevents excessive input to the rear bush 18. In addition, it is possible to prevent the generation of abnormal noise due to contact between the protrusion 22 and the bracket 20.
[0052] Furthermore, since the outer peripheral portion 34a and the end face portion 34b of the elastic member 34 are formed integrally, the manufacturing process of the stopper 24 can be simplified. [Explanation of Symbols]
[0053] 1. Vehicle body 2 wheels 4 Front suspension 6. Lower Arm 8. Front arm section 10 Rear arm section (arm) 10a Rear end (rear end of the arm) 12 Mounting part 14 Mounting part 16 Front bushing 18. Rear bushing (elastic bushing) 20 brackets 20a Flange section 22 Protrusion 24 Stopper 26 Outer cylinder 28 Inner cylinder 30 Elastic body 32 Core members 34 Elastic members 34a Outer periphery (first elastic member) 34b End face portion (second elastic member)
Claims
1. A mounting structure for a vehicle suspension arm, A cylindrical bracket fixed to the vehicle body and having a central axis in the longitudinal direction of the vehicle body, A cylindrical elastic bush having a central axis in the longitudinal direction of the vehicle body, wherein the outer circumference of the elastic bush is held by the inner circumference of the bracket, and the elastic bush and An arm that can swing vertically around an axis extending in the longitudinal direction of the vehicle body through the elastic bush, wherein the rod-shaped rear end extending to the rear of the vehicle body is held on the inner circumference of the elastic bush, and is connected to the bracket via the elastic bush, The system includes a stopper fixed to the rear end of the arm, located in front of the vehicle body and on the inner circumference side of the bracket, The rear end of the stopper is located further back than the front end of the bracket, and when the rear end of the arm is displaced a predetermined distance in the vehicle width direction, the stopper contacts the inner circumference of the bracket. Mounting structure for vehicle suspension arms.
2. The stopper comprises a core member fixed to the rear end of the arm in front of the vehicle body relative to the elastic bush, and a first elastic member provided on the outer surface of the core member facing the inner circumference of the bracket. Mounting structure for a vehicle suspension arm according to claim 1.
3. The rear end of the arm has a projection that protrudes inward in the vehicle width direction from the inward end of the bracket in the vehicle width direction, in front of the front end of the bracket in the vehicle width direction, When the rear end of the arm is displaced by a predetermined distance or more to the rear of the vehicle body, the rear end of the protruding part presses against the front end of the bracket. Mounting structure for a vehicle suspension arm according to claim 1.
4. The system includes a second elastic member provided between the rear end of the vehicle body of the protruding portion and the front end of the vehicle body of the bracket, Mounting structure for a vehicle suspension arm according to claim 3.
5. The stopper comprises a core member fixed to the rear end of the arm in front of the vehicle body relative to the elastic bush, and a first elastic member provided on the outer surface of the core member facing the inner circumference of the bracket. The first elastic member and the second elastic member are formed integrally. Mounting structure for a vehicle suspension arm according to claim 4.