A control arm bushing for rear wheel steering applications

Abstract

The present application relates to the technical fields of control arm bushing used in rear suspension system, in particular to a control arm bushing used in rear wheel steering, comprising a first plastic limiting ring, an outer sleeve, a rubber body, an inner sleeve and a second plastic limiting ring; the outer sleeve, the rubber body and the inner sleeve are coaxially arranged from outside to inside; the first plastic limiting ring is coaxially arranged at one end of the inner sleeve; the second plastic limiting ring is coaxially arranged at the other end of the outer sleeve, and the two ends of the inner sleeve are flush with the outer end of the first plastic limiting ring and the outer end of the second plastic limiting ring; the two ends of the rubber body are connected with the inner end of the first plastic limiting ring and the inner end of the second plastic limiting ring. The control arm bushing used in rear wheel steering solves the problem that the ordinary bushing with low static stiffness, large deflection and large durability load cannot meet, and at the same time ensures the comfort of the whole vehicle, and makes a great contribution to reducing the turning radius during vehicle driving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control arm bushing used in rear suspension system, and particularly relates to a control arm bushing used in rear wheel steering. BACKGROUND

[0002] The control arm bushing is the most important automobile component for filtering and isolating vibration in the chassis suspension system of an automobile, and mainly functions to connect the chassis suspension system and the automobile body to transmit load, attenuate vibration and noise. The structure design of the bushing needs to meet the comfort and handling performance requirements of the whole automobile, and can effectively attenuate the vibration and noise transmitted from the road through the wheels. Especially, the performance requirements of high-end electric vehicles are increasingly high, and the comfort pursuit is also increasingly high. On the one hand, the requirements of low static stiffness, low dynamic-static ratio or ground dynamic ratio need to be met, and on the other hand, the durability requirements under harsh working conditions also need to be met.

[0003] In recent years, the domestic high-end electric vehicle market has been opened, and there are too many cars with zero-to-hundred 5 seconds. The cars with rear wheel steering function have become the most popular in the current automobile market, and they represent the high-end market. However, the harsh durability working conditions require a bushing that can meet comfort and withstand fatigue working conditions. The ordinary rear suspension connecting rod bushing mainly meets the radial load and the rotational torque load applied around the center of the inner tube in function, and almost has no functional requirement in the yaw direction. This mainly depends on the vertical angle between the axial direction of the installed bushing and the front-rear direction of the whole automobile, and is rarely subjected to the torque load in the yaw direction. SUMMARY

[0004] The present application provides a control arm bushing used in rear wheel steering in view of the deficiencies of the prior art.

[0005] The present application solves the above technical problems by the following technical means:

[0006] A control arm bushing used in rear wheel steering, comprising a first plastic limiting ring, an outer sleeve, a rubber body, an inner sleeve and a second plastic limiting ring.

[0007] The outer sleeve, the rubber body and the inner sleeve are coaxially arranged from outside to inside; the first plastic limiting ring is coaxially arranged at one end of the inner sleeve; the second plastic limiting ring is coaxially arranged at the other end of the outer sleeve, and the two ends of the inner sleeve are flush with the outer ends of the first plastic limiting ring and the second plastic limiting ring; and the two ends of the rubber body are connected with the inner ends of the first plastic limiting ring and the second plastic limiting ring.

[0008] As the improvement of the above technical scheme, the control arm bushing for rear wheel steering, the first plastic limiting ring and the second plastic limiting ring are both made of nylon 66+30% glass fiber injection; and the first plastic limiting ring and the second plastic limiting ring are the same structure; the outer end edge of the first plastic limiting ring is radially convex to form a thickening step; the inner end edge of the first plastic limiting ring is coaxially provided with a plurality of round convex circles; the first plastic limiting ring is provided with a groove between the thickening step and the round convex circle; and the groove is coaxial with the first plastic limiting ring.

[0009] As the improvement of the above technical scheme, the control arm bushing for rear wheel steering, the rubber body adopts natural rubber, and the outer edge of the two ends of the rubber body is coaxially provided with a rubber convex rib; and the two ends of the rubber body are respectively connected with the first plastic limiting ring and the second plastic limiting ring through the interference fit of the rubber convex rib.

[0010] The manufacturing method of the control arm bushing for rear wheel steering comprises the following steps:

[0011] Step one: the inner sleeve, the rubber body and the outer sleeve are vulcanized into a bushing assembly through a vulcanization mold under specific time, pressure and temperature;

[0012] Step two: the first plastic limiting ring and the second plastic limiting ring are assembled at the two ends of the bushing assembly through a special assembly fixture or manual assembly.

[0013] The control arm bushing for rear wheel steering can effectively improve the shortcomings of the ordinary suspension bushing composed of an inner sleeve, an outer sleeve and a rubber part, and further ensure the overall production of the vehicle; solve the problems that the ordinary bushing cannot meet the low static stiffness, large deflection and large durability load; and ensure the comfort of the vehicle, reduce the turning radius during vehicle driving, and make a great contribution. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the control arm bushing for rear wheel steering.

[0015] Figure 2 It is an exploded view of the control arm bushing for rear wheel steering.

[0016] Figure 3 It is a three-dimensional wireframe view of the rubber body.

[0017] Figure 4 It is a three-dimensional wireframe view of the plastic limiting ring (the first plastic limiting ring and the second plastic limiting ring). DETAILED DESCRIPTION

[0018] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0019] An embodiment of the present application is a control arm bushing for rear wheel steering, which comprises a first plastic limiting ring 1, an outer sleeve 2, a rubber body 3, an inner sleeve 4 and a second plastic limiting ring 5.

[0020] The outer sleeve 2, the rubber body 3 and the inner sleeve 4 are coaxially arranged from outside to inside; the first plastic limiting ring 1 is coaxially arranged at one end of the inner sleeve 4; the second plastic limiting ring 5 is coaxially arranged at the other end of the outer sleeve 2, and the two ends of the inner sleeve 4 are flush with the outer end of the first plastic limiting ring 1 and the outer end of the second plastic limiting ring 5; the two ends of the rubber body 3 are connected with the inner end of the first plastic limiting ring 1 and the inner end of the second plastic limiting ring 5.

[0021] The outer sleeve 2 and the inner sleeve 4 are made of aluminum alloy; two plastic limiting rings (the first plastic limiting ring 1 and the second plastic limiting ring 5) are arranged at the positions where the two ends of the inner sleeve 4 are flush with the end faces of the inner sleeve 5; the rubber body 3 is protected in the vehicle road test in terms of the deflection direction and the radial loading of the bushing, so as to ensure that the control arm bushing can still maintain the handling stability performance and the comfort performance such as shock isolation of the rubber body after the road test. The plastic limiting ring is made of plastic material and has a certain elasticity, so it can also play a role in vibration isolation, and the damage to the rubber body caused by direct contact with the inner sleeve and the outer sleeve is smaller; the plastic limiting ring also contributes to the lightweight design of the vehicle. The plastic limiting ring can well protect the rubber body 3 in the road conditions such as driving, turning, crossing a ditch and collision, and the plastic limiting ring mainly bears the protection of the radial large load and the large angle deflection, so as to ensure the comfort and durability of the vehicle.

[0022] As an improvement of the above technical solution, the first plastic limiting ring 1 and the second plastic limiting ring 5 are both injection molded by nylon 66+30% glass fiber; the first plastic limiting ring 1 and the second plastic limiting ring 5 are the same in structure; the outer end edge of the first plastic limiting ring 1 is radially protruded to form a thickened step 11; a plurality of round corner beads 12 are coaxially arranged at the inner end edge of the first plastic limiting ring 1; a groove 13 is arranged between the thickened step 11 and the round corner bead 12 of the first plastic limiting ring 1; and the groove 13 is coaxial with the first plastic limiting ring 1.

[0023] The setting of the round corner convex ring 12 forms a smooth transition, reduces the friction damage to the rubber body 3; the design of the groove 13 can appropriately increase the deflection angle of the bushing, improve the comfort of the suspension; the design of the thickening step 11 on the top can ensure the strength of the plastic limiting ring, thereby providing sufficient pulling force and facilitating the replacement or removal of the plastic limiting ring.

[0024] As an improvement of the above technical solution, the rubber body 3 is made of natural rubber, and rubber convex ribs 31 are coaxially arranged on the outer edges of both ends of the rubber body 3; the two ends of the rubber body 3 are respectively fitted with the first plastic limiting ring 1 and the second plastic limiting ring 5 through the rubber convex ribs 31.

[0025] Because the volume of rubber is almost incompressible, if the rubber convex rib 31 is not designed, it will cause the risk of extrusion of the rubber body 3 or the falling off of the plastic limiting ring.

[0026] The manufacturing method of the control arm bushing used for the rear wheel steering comprises the following steps:

[0027] Step one: the inner sleeve 4, the rubber body 3 and the outer sleeve 2 are vulcanized into a bushing assembly through a vulcanization mold under specific time, pressure and temperature;

[0028] Step two: the first plastic limiting ring 1 and the second plastic limiting ring 5 are assembled at both ends of the bushing assembly through a special assembly fixture or manual assembly.

[0029] It should be noted that in this text, if there are relationship terms such as first and second, they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0030] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control arm bushing for use in rear wheel steering, characterized by: It comprises a first plastic limiting ring (1), an outer sleeve (2), a rubber body (3), an inner sleeve (4) and a second plastic limiting ring (5); The outer sleeve (2), the rubber body (3) and the inner sleeve (4) are coaxially arranged from outside to inside; the first plastic limiting ring (1) is coaxially arranged outside one end of the inner sleeve (4); the second plastic limiting ring (5) is coaxially arranged outside the other end of the outer sleeve (2), and the two ends of the inner sleeve (4) are flushly arranged with the outer end of the first plastic limiting ring (1) and the outer end of the second plastic limiting ring (5) respectively; the two ends of the rubber body (3) are connected with the inner end of the first plastic limiting ring (1) and the inner end of the second plastic limiting ring (5) respectively; The first plastic limiting ring (1) and the second plastic limiting ring (5) are both made of nylon 66 and 30% glass fiber injection; and the first plastic limiting ring (1) and the second plastic limiting ring (5) are the same in structure; the outer end edge of the first plastic limiting ring (1) is radially protruded to form a thickening step (11); the inner end edge of the first plastic limiting ring (1) is coaxially provided with a plurality of round corner beads (12); the first plastic limiting ring (1) is provided with a groove (13) between the thickening step (11) and the round corner bead (12); the groove (13) is coaxial with the first plastic limiting ring (1); The rubber body (3) is made of natural rubber, and the rubber body (3) is coaxially provided with rubber protruding ribs (31) on the outer edges of the two ends; the two ends of the rubber body (3) are connected with the first plastic limiting ring (1) and the second plastic limiting ring (5) through the interference fit of the rubber protruding ribs (31).

2. A method of manufacturing a control arm bushing for rear wheel steering use as claimed in claim 1, characterized in that: It comprises the following steps: Step one: the inner sleeve (4), the rubber body (3) and the outer sleeve (2) are vulcanized and formed into a bushing assembly through a vulcanization mold under specific time, pressure and temperature; Step two: the first plastic limiting ring (1) and the second plastic limiting ring (5) are assembled at the two ends of the bushing assembly through a special assembly clamp or manual assembly.

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