KR20030018913A - Rear suspension system of vehicle - Google Patents

Abstract

PURPOSE: A rear wheel suspension of a vehicle is provided to improve operational safety and secure durability and safety of the suspension by dispersing load input into a bush when front and rear force is given. CONSTITUTION: Trailing arms(4,6) are formed at both side ends of a torsion beam(2), in one body and wheel carriers(12,14) supporting wheels are formed outside the rear ends of the trailing arms. The front ends of the trailing arms are protruded on the front side of the torsion beam, and mount units(16,18) are formed at the tips of the trailing arms and mounted on a vehicle body. A shock-absorbing device comprised of coil springs(20,22) and shock absorbers(24,26) are mounted inside the wheel carriers. Toe control links(28,30), to connect the outside of the front side of the trailing arms and the vehicle body, are disposed outside the front side of the trailing arms. Fixing bolts facing outside and inside are coupled with the front and rear ends of the links by a ball joint method. The rear ends of the links are fixed to the trailing arms by the fixing bolts and the front ends of the links are fixed to the vehicle body by the fixing bolts. Toe-in tendency is induced when lateral force is given to the rear wheels and therefore, operational safety is improved in turning.

Description

Rear wheel suspension of car {REAR SUSPENSION SYSTEM OF VEHICLE}

The present invention relates to a rear wheel suspension of an automobile, and more particularly, has a slight toe-in or toe-zero tendency when a lateral force is applied, thereby improving steering safety and distributing a load input to the bush when anterior and rear forces are applied. It relates to a rear wheel suspension of a vehicle to improve the durability.

For example, a suspension device in a vehicle exists between a vehicle body and a wheel, and is a device that connects the two rigid bodies using one or more links, and is supported by a spring and a hydraulic shock absorber in the vertical direction. In the other direction, by appropriately matching the high stiffness and flexibility, it performs a function to mechanically match the relative movement between the vehicle body and the wheel.

Such a suspension device, firstly, effectively blocks the irregular input of the road surface generated while driving the vehicle to provide a comfortable ride of the passenger,

Secondly, it should provide the convenience of driving by controlling the shaking of the car body caused by driver's driving behavior and road curvature.

Third, it is necessary to satisfy the basic condition that the vehicle should maintain the vertical load at the tire ground surface at an appropriate level when driving on irregular roads to ensure the stability of the vehicle during turning and braking driving.

In order to satisfy the above conditions, various kinds of suspension devices have been developed and applied to actual vehicles. As an example, a torsion beam type suspension device may be mentioned.

Looking at the general configuration of such a torsion beam type suspension device, as shown in Figures 4 and 5, trailing arms 104, 106 are integrally formed at both ends of the torsion beams 102 arranged in the vehicle width direction. Outside the rear end of the trailing arms 104, 106, wheel supports 112, 114 that support the wheels 108, 110 are integrally formed.

In addition, the front end portions of the trailing arms 104 and 106 protrude toward the front side of the torsion beam 102 so that mount portions 116 and 118 are formed at the tip portion thereof, and rubbers are mounted on the mount portions 116 and 118. Mounting on the vehicle body via the bush 120, 122, the shock absorbing means consisting of coil springs (124) (126) and shock absorbers (128) (130) on the rear side of the trailing arms (104) (106). Is placed.

Accordingly, when the rear portion of the trailing arms 104 and 106 is elevated together with the wheels 108 and 110 according to the condition of the road surface and the vehicle driving state, the lifting unit 116 and 118 are lifted by the hinge. In this case, up and down vibration and shock are attenuated by the buffer means, and at the same time, the rubber bushes 120 and 122 are flexibly absorbed by an appropriate elastic force.

However, according to the suspension device as described above, the rubber bush applied to the mount part is applied in a state having a uniform thickness, as shown in FIG. When this is input, its load is applied to the wheel 108 located on the rear side of the mount, so that it is pushed in the same state as the solid line in the same state as the virtual line.

The rolling thereof is made possible by the elastic force of the rubber bushes 120 and 122. When the suspension is rotated counterclockwise in the drawing, the turning outer wheel 108 is eventually led to the state of toe-out.

As the lateral force is applied to the wheel, the attitude of the wheel tends to toe out, which adversely affects the following tracking, straight-line stability and turning stability required in the rear suspension of the vehicle, resulting in poor steering stability. There is a problem.

Therefore, the present invention has been conducted to solve the above problems, as a result of the development of the rear wheel suspension, the rear wheel suspension of the vehicle to improve the steering safety with a slight toe-in or toe-zero tendency when the lateral force is applied The purpose is to provide.

In addition, when the front and rear forces are applied to the wheel, it is possible to accommodate its load in a number of places so that the durability and stability of the suspension device can be secured.

1 is a perspective view of a suspension device according to the present invention.

2 is an enlarged plan view of the main portion of the present invention.

Figure 3 is a schematic plan view for explaining the operation of the present invention.

4 is a temporary example of a conventional suspension device.

5 is an operation diagram when a lateral force is applied to a conventional suspension device.

In order to realize this, in the present invention, a trailing arm is integrally formed at both end portions of the torsion beam disposed in the vehicle width direction, and the wheel is supported outside the rear end of the trailing arm, and the front end portion of the trailing arm is torsioned. In the rear wheel suspension which protrudes to the front side of the beam and whose front end portion is mounted to the vehicle body,

Provided is a rear wheel suspension of an automobile comprising a tow control link connecting an outer side of a front side of the trailing arm to a vehicle body.

The tow control link is fixed to the trailing arm using a fixed bolt is fixed to the front and rear ends of the link having a fixed length to the outer and inner fixing bolts in the ball joint method, the front end is fixed bolt It is characterized by being fixed to the vehicle body by using.

In the above, the front end ball joint of the tow control link is located in the same line as the mount of the trailing arm, and a virtual straight line interconnecting the front and rear ball joints of the tow control link and the front part ball joint and trailing. It is characterized in that the internal angle θ with an imaginary straight line connecting the mount portion of the arm is maintained at 0 <θ <90 °.

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.

1 is a perspective view of a suspension according to the present invention, 2 denotes a torsion beam.

The torsion beam 2 is integrally formed with trailing arms 4 and 6 at both ends, and supports the wheels 8 and 10 outside the rear end of the trailing arm 4 and 6. Wheel carriers 12 and 14 are formed.

The front end of the trailing arms 4 and 6 protrudes toward the front side of the torsion beam 2 so that the mount portions 16 and 18 are formed at the tip portion thereof, and the mount portions 16 and 18 thereof. It is mounted on the car body through the rubber bush.

In addition, the inner portion of the wheel carrier 12, 14 is provided with a buffer means consisting of coil springs 20, 22 and shock absorbers 24, 26.

In this suspension system, the tow control links 28 and 30 are disposed outside the front side of the trailing arms 4 and 6.

2, the tow control links 28, 30 are fixed to the front and rear ends of the arc-shaped link 32 having a predetermined length to see the fixing bolts 34 and 36 facing outward and inward, respectively ( 38) (40), the rear end is fixed to the trailing arm (6) using the fixing bolt 36, the front end is connected to the vehicle body using the fixing bolt (34).

The front end ball joint 38 is located on the same line as the mount 18 of the trailing arm 6 and interconnects the ball joints 38 and 40 of the tow control link 32. The internal angle θ of the imaginary straight line S and the imaginary straight line L connecting the mount portion 18 of the trailing arm 6 with the front part ball joint 38 is maintained at 0 &lt; Do it.

According to the rear wheel suspension of the present invention, when the lateral force (Fy) is applied to the wheels (8) and (10) by turning, etc., the tow by the operation of the tow control link (28) (30), as shown in FIG. Change will be made.

That is, the tow control link 28 disposed on the turning outer wheel 8 side acts to push the front end of the trailing arm 4 toward the vehicle body and pull it to the front side, and the turning inner wheel 10 side. The arranged tow control link 30 acts to push the trailing arm 6 to the rear and to push it outward.

As a result, the torsion beam 2 assembly as a whole is inclined inwardly as shown in FIG. 3, so that the wheels 8 and 10 coupled thereto tend to be toe.

As a result, following the front wheel as the rear wheel when turning is improved, it is possible to improve the steering safety when turning.

In addition, by increasing the number of parts connecting the entire suspension system to the vehicle body, when the front and rear forces are applied to the wheel, the input load is distributed and transmitted to the vehicle body, thereby improving durability and vibration characteristics.

As described above, according to the present invention, by inducing the rear wheel to have a tendency to tow when the lateral force is applied, it is possible to improve the steering safety during turning.

And by the injection and absorption of the load input when the front, rear force is applied, it is an invention that can improve the durability and vibration characteristics accordingly.

Claims (3)

A trailing arm is integrally formed at both ends of the torsion beam disposed in the vehicle width direction, and supports the wheel outside the trailing end of the trailing arm, and the front end of the trailing arm protrudes to the front side of the torsion beam, and the front end thereof. In the rear wheel suspension in which the part is mounted on the vehicle body, And a tow control link for connecting the outer side of the front side of the trailing arm to the vehicle body. According to claim 1, Tow control link is fixed to the trailing arm by using a fixed bolt is fixed to the fixed bolts facing the outer and the inner side in the front and rear ends of the link having a predetermined length, respectively, Front end suspension of the vehicle, characterized in that fixed to the vehicle body using a fixing bolt. The tow ball joint of the front end of the tow control link is positioned in line with the mount of the trailing arm, and the virtual straight line interconnecting the front and rear ball joints of the tow control link. A rear wheel suspension of a vehicle, characterized in that the internal angle θ of an imaginary straight line connecting the foremost ball joint and the mount of the trailing arm is maintained at 0 <θ <90 °.