KR100293679B1 - Bush system for mounting trailing arm of suspension in vehicle - Google Patents

Abstract

PURPOSE: A bush system of mounting a trailing arm for a suspension in a vehicle is provided to improve performance by modifying the shape of an installation bracket, and to enhance handling by reducing impact and preventing a bush from being deformed against external force. CONSTITUTION: An installation bush(20) is composed of a first bush(22) and a second bush(24), and mounted in an installation bracket(26). A trailing arm(16) is connected to a control arm or a wheel carrier, and a front end(28) of the trailing arm is connected to the vehicle body with the installation bush. A radial protrusion(27) is formed in the installation bracket, and assembled with the first bush. A fitting hole(34) is formed in the middle of the first bush to insert the trailing arm, and a first groove(32) is formed around the fitting hole. The second bush is inserted to the front end of the trailing arm, and tightened with a nut(38) in inserting a washer(30). Tension force or compressive force is reduced with first and second bushes in braking or bumping. The vehicle is stabilized with preventing deformation of the first bush by assembling the first groove with the protrusion of the installation bracket.

Description

Mounting structure of trailing arm bush of automobile suspension

The present invention relates to a mounting structure of a trailing arm bush applied to a trailing arm suspension of an automobile.

Suspensions in automobiles exist between the body and the wheels and are connected by one or more control arms, supported by springs and shock absorbers in the vertical direction, and high rigidity and flexibility in the other directions. By appropriately harmonizing, mechanically harmonizes the relative movement between the vehicle body and the wheels to absorb vibrations and shocks received from the road surface while driving to improve ride comfort and turning stability.

In order to satisfy the performance of various sectors for the input from the road surface, the following three conditions are required.

First, for the sake of steering stability, the tire should maintain the ideal posture on the road surface to maximize the grip force on the road, and the body should maintain the best posture in its own way to enable the desired vehicle movement state. In addition, it must not have any momentary force to get the next motion at all times and at the same time allow any action by external input except the driver's intended direction and moment.

Secondly, for comfort, the passengers should be able to absorb any shocks sensitively so that passengers in the car will not feel uncomfortable.

Third, it is necessary to contribute to the absorption of the collision energy in the collision to increase the collision safety.

Accordingly, in recent years, the development of high-performance suspension devices to meet the above requirements has been made in various fields, and various structural types have been developed and applied to the most suitable for design vehicles.

In such a suspension device, the present invention relates to a suspension device to which a trailing arm is applied to increase the stiffness of front and rear, and looks at an example of the suspension device to which the trailing arm is applied.

1 shows an embodiment of a suspension device to which a trailing arm is applied, wherein an upper portion of a wheel carrier 2 rotatably supporting a wheel is integrally formed with a coil spring 4 and a shock absorber 6. Suspended on the vehicle body by the strut assembly 8 is formed.

The lower part of the wheel carrier 2 is connected to the vehicle body or the subframe 14 by the front and rear control arms 10 and 12 arranged in the vehicle width direction, and the rear end of the trailing arm 16 is necessarily the front control. It is not connected to the arm 10 but may be connected to the wheel carrier 2.

Accordingly, the impact load and vibration input from the irregular road surface are attenuated by the operation of the strut assembly, and the lateral and front and rear forces input by turning and braking are absorbed and mitigated by the kinematic operation of the control arm and the trailing arm. According to the input condition, the attitude of the wheel is changed to have the most ideal driving condition.

In such a suspension device, the trailing arm plays a role of flexibly absorbing it when the front and rear forces are applied to the wheel by turning and braking. Looking at the conventional configuration of the trailing arm, as shown in FIG. It consists of a metal rod 100, the front end is connected to the vehicle body so that the bracket 106 can be positioned between the front and rear two bushes 102, 104, the rear end is fixed to the front control arm 10 It is formed in a structure.

The front and rear bushes 102 and 104 are fastened by nuts 112 with washers 108 and 110 respectively, and the front and rear bushes are applied to the wheels when the front and rear wheels are applied or lifted or lowered. The 102 and 104 may be deformed with an appropriate elastic force to ideally maintain the posture of the wheel.

In other words, before and after the bush (102, 104) is made to retain the spring characteristics by softening to improve the collision performance.

Accordingly, when the external force is transmitted in the direction of the arrow 114 according to FIG. 7, the wheel carrier 2 and the trailing arm 100 are deformed by the deformation of the front and rear bushes 102 and 104. At this connected point A, A 'is moved by δ.

Accordingly, the wheel 116 is driven around the wheel center W.C with excessive oversteer by rotating around the point C point where the shock absorber 8 and the wheel carrier 2 are connected.

However, there is a problem in that the bushing for connecting and mounting the conventional trailing arm to the vehicle body is soft, causing excessive deformation during bumping or rebounding, thereby incomplete driving in the oversteer state.

Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to change the shape of the mounting bushing connecting the trailing arm to the vehicle body, the trailing arm mounting of the vehicle suspension device improved the characteristics of the bush In providing a bush.

In order to realize this, the present invention is in the mounting portion for connecting the front end of the trailing arm is arranged in the longitudinal direction of the vehicle body and the rear end is connected to the control arm or wheel carrier of the vehicle suspension,

A first bush having a first groove formed to be assembled after the washer inserted into the wheel-side trailing arm front end with the protrusion formed on the mounting bracket of the vehicle body;

A second bush inserted into the trailing arm front end of the vehicle body around the mounting bracket and having a second groove to be tightened with a nut after the washer is inserted;

The present invention provides a trailing arm mounting bush of a vehicle suspension formed by forming a projection in a radial manner to be coupled to a first groove of a first bush on one side of a mounting bracket.

According to the present invention, when the trailing arm is connected to the vehicle body side, first and second grooves are formed in each of the first and second bushes interposed on both sides of the mounting bracket, and the radial protrusion is formed on one side of the mounting bracket to form the first groove. By combining the first and second bushings, the second bushing is deformed during braking to attenuate the recognition force, and the first part is deformed during bumping to attenuate the compressive force, thereby reducing the compressive force. To increase handling.

1 is a perspective view of a suspension device for showing the action of the present invention.

Figure 2 is an exploded perspective view showing the mounting structure of the trailing arm bush according to the present invention.

Figure 3 is an assembled cross-sectional view of the mounting structure of the bush of the trailing arm according to the present invention.

4 is a view showing an example of a conventional trailing arm.

<Explanation of symbols for the main parts of the drawings>

22: 1st bush 24: 2nd bush 26: mounting bracket 30: washer

32: 1st groove 38: Nut 40: 2nd groove

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

Figure 1 shows an example of a suspension device for showing the application of the present invention, the description of the configuration is the same as above will be omitted.

2 and 3 are exploded perspective views and assembling cross-sectional views of the trailing arm according to the present invention, wherein the mounting bush 20 of the present invention comprises a first bush 22 and a second bush 24. Are mounted on both sides of the mounting bracket 26 provided in the mounting bracket 26.

The mounting bracket 26 is provided with a projection 27 in a radial manner, and the first bush 22 is assembled after the washer 30 is inserted into the wheel side of the trailing arm 16 front end 28.

The first bush 22 has an insertion hole 34 for inserting the trailing arm 16 in the center and a cross-shaped first groove 32 with the insertion hole 34 as the center. . (See Fig. 4)

The second bush 24 is inserted into the front end portion 28 of the trailing arm 16 of the vehicle body centering on the mounting bracket 26 and tightened with the nut 38 after the washer 30 is interposed.

The second bush 24 forms the same second groove 40 as the first bush 22, and the second groove 40 does not matter as long as it has the shape of the groove. (See Fig. 5)

The present invention made as described above stabilizes the vehicle body by attenuating the tensile force or the compressive force according to the deformation characteristics of the first and second bushes 22 and 24 when the braking force is applied through the trailing arm 16 or during the bump.

In other words, when braking, the external force pushes the wheel, and the trailing arm 16 prevents the toe-out of the wheel by the deforming second bush 24.

At the time of bumping, since the trailing arm 16 is engaged with the projection 27 of the first groove 32 and the mounting bracket 26, the compressive deformation of the first bush 22 is suppressed, and excessive toe-in of the wheel This stabilizes the vehicle body and improves driving performance.

As described above, according to the present invention, by forming a projection on the mounting bracket, there is an effect that the deformation characteristics can be changed without producing the bush according to the specification.

In addition, by varying the deformation characteristics of the bush, not only the impact performance reduction effect but also the excessive deformation of the bush is suppressed according to the change of external force, so that the property is easy to implement and the handling property is improved.

Claims (4)

In the mounting portion for connecting the front end of the trailing arm arranged in the longitudinal direction of the vehicle body and the rear end of the trailing arm connected to the control arm of the vehicle suspension or the wheel carrier, A first bush having a first groove formed to be assembled after a washer inserted into the wheel-side trailing arm front end with the mounting bracket of the vehicle body as a center; A second bush inserted into the trailing arm front end of the vehicle body around the mounting bracket and having a second groove to be tightened with a nut after the washer is inserted; The trailing arm bush mounting structure of the vehicle suspension, characterized in that formed by forming a projection coupled to the first groove of the first bushing on one side of the mounting bracket. The trailing arm bush mounting structure for a vehicle suspension according to claim 1, wherein the first bush is formed with an insertion hole into which a trailing arm is inserted, and a cross-shaped first groove centered on the insertion hole. The trailing arm bush mounting structure of claim 1, wherein the second bush forms an insertion hole into which the trailing arm is inserted, and a cross-shaped second groove centered on the insertion hole. The trailing arm bush mounting structure of claim 1, wherein the protrusion is formed in a cross shape to coincide with the first groove of the first bush.

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