KR20030050602A - Rear-suspension system - Google Patents

Abstract

PURPOSE: A rear suspension system of a vehicle is provided to retaining drivability in cornering by installing an auxiliary link unit to compensate lateral force transmitted to the rear suspension system. CONSTITUTION: A rear suspension system of a vehicle has trailing arms(22,24) installed to right and left rear wheels(44,42) and connected by a torsion beam shaft(10). The rear suspension system has a link unit connected to the trailing arms, to compensate lateral force generated in cornering. The link unit has first and second links(110,120) connected to the trailing arms; a third link(130) disposed between the first and second links; and plural connecting units connecting the first, second, and third links and fixing the links to the trailing arms and a vehicle body. The third link changes the lateral force transmitted to the first and second links in the opposite direction. Thus, drivability is improved, not lowering riding comfort.

Description

Rear suspension device for automobiles {REAR-SUSPENSION SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension device for a vehicle, and more particularly, to a rear suspension device for a vehicle for maintaining steering stability during corner driving by providing an auxiliary link part to offset the lateral force transmitted to the rear suspension device during cornering while driving a vehicle. It is about.

In general, the suspension of the vehicle is provided between the vehicle body and the wheels and is connected to two rigid bodies by one or a plurality of control arms, supported by springs and shock absorbers in the vertical direction, and high rigidity and flexibility in other directions. It is a device that improves stable riding comfort and turning stability by absorbing vibrations and shocks received from the road surface while appropriately harmonizing the relative movement between the vehicle body and the wheels.

The suspension is structurally divided into an axle suspension system and an independent suspension system. The integrated axle suspension system is applied to large vehicles such as buses and trucks and the rear axle of passenger cars. It is applied to passenger cars mainly to improve ride comfort and stability by moving independently of each other.

Among the independent suspensions, the torsion beam type suspension is referred to as a semi-rigid axle, trailing arm suspension, and has a structure formed by connecting left and right trailing arms to a cross beam.

It is divided into axle beam, pivot beam, and coupled beam according to the attachment position of the cross beam, and is mainly applied to the rear suspension of a front wheel drive (FF) compact car.

The rear suspension here relates in particular to the coupled beam type, the structure of which is installed on the rear wheels 42 and 44 on the left and right sides, respectively, as shown in FIG. 4 and is connected and interlocked by the torsion beam shaft 10. Bushings 32 coupled between the respective trailing arms 22 and 24 and the ends of the trailing arms 22 and 24 and attenuating up, down and left and right vibrations or shocks transmitted from the road surface, 34).

In the rear suspension device of this structure, as shown in FIG. 5, a force in a direction opposite to the vehicle traveling direction steered by the front wheel steering device (not shown) is transmitted to the left and right rear wheels 42 and 44. Moments transmitted to the rear wheels 42 and 44 change the centers of the bushes 32 and 34 located at the ends of the left and right trailing arms 22 and 24.

Accordingly, in the conventional handling characteristics, the lateral stiffness is weakened, resulting in oversteering (OVER-STEER), and the steering stability is lowered.

In addition, the method of reinforcing the bush mounted on the vehicle body to overcome this can increase the steering stability by reinforcing the lateral stiffness, but this has a problem that adversely affects the riding comfort.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object thereof is to improve driving stability by directing the suspension on the rear wheel side in the same direction as the traveling direction of the vehicle during cornering driving of the vehicle. To provide a rear suspension device.

1 is a plan view showing a rear suspension device of a vehicle according to the present invention.

2 is a front view of FIG. 1;

3 is a view schematically showing an operating state of the present invention,

Figure 3a shows a state in which the lateral force is acting when turning,

Figure 3b shows the state when the wheel moves in the up, down direction.

4 is a view showing a rear suspension device of a conventional vehicle.

5 is an operating state diagram schematically showing the operating state of FIG.

Explanation of symbols on the main parts of the drawings

10: torsion beam axis 22, 24: trailing arm

32,34: bush 42,44: rear wheel

100: link unit 110: first link

120: second link 130: third link

142,144,146,147,148: 1,2,3,4,5 connectors

In the present invention for achieving the above object, in the rear suspension device of the vehicle having a respective trailing arm which is installed on each of the rear wheels on the left and right and connected by the torsion beam axis, interlocked,

It is connected to the left and right trailing arms, characterized in that the link portion for further attenuating the lateral force generated during the cornering driving.

In addition, another characteristic element of the present invention is that the link portion is provided between the first and second links and the first and second links, respectively, connected to the left and right trailing arms, and installed on the vehicle body to the first and second links. And a third link for changing and transmitting the left and right lateral forces in directions opposite to each other, and a connector for connecting and fixing the first, second, third links to the trailing arm and the vehicle body, respectively. will be.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The rear suspension device of the vehicle according to the present invention, with reference to FIGS. 1 to 3, is provided on each of the rear wheels 42 and 44 on the left and right sides, respectively, and is connected by the torsion beam shaft 10 and connected to each trailing arm ( 22 and 24 and link portions 100 connected to the left and right trailing arms 22 and 24 for canceling the lateral force transmitted during cornering driving.

In more detail, the link unit 100 is connected to the first and second links 110 and 120 installed at the left and right trailing arms 22 and 24, respectively, and is connected to the lower side of the vehicle body and the first and second links 110 and 120. The third link 130 and the first link 110 are provided between the first and second links 110 and 120 to convert the lateral forces transmitted from the first and second links 110 and 120 into directions opposite to each other. And a plurality of first, second, third, fourth, and fifth connectors 142, 144, 146, 147, and 148 for fixing to each of the 24 and 24, respectively.

That is, the first link 110 is coupled to the first connector 142 on the upper side of the left trailing arms 22 and 24 as shown in the drawing, and the second link 120 is the right trailing arms 22 and 24. ) Is coupled to the lower side of the second connector 144, the third link 130 is installed as a fourth connector 147 on the vehicle body so as to be rotatable perpendicularly to the ends of the first and second links 110 and 120. The second link 110 and 120 are connected to the third and fifth connectors 146 and 148, respectively.

The plurality of connectors preferably employ a bushing or ball joint to secure the connection of each of the first, second, third links 110, 120, and 130.

Reference numerals 32 and 34 denote bushes coupled between the ends of the left and right trailing arms 22 and 24 and the vehicle body to attenuate the up, down and left and right vibrations or shocks transmitted from the road surface. will be.

Hereinafter, the operation of the present invention will be described.

First, the lateral force is transmitted to the rear wheels 42 and 44 during cornering driving of the vehicle, so that the forces F1 and F2 are pushed to the rear suspension in the lateral direction, respectively.

If the force of F1 proceeds from the left side to the right side of the first link 110, and then the negative force (-at the right side of the second link 120) opposite to the force in the third link 130 To the left to cancel the force of the F2 acting on the second link (120).

At this time, the force of F1 proceeds in the direction opposite to the first and second links (110,120).

On the other hand, the force of F2 acts as a force to proceed from the left side to the right side of the second link 120, and then the negative force (first link 110) opposite to the force in the third link 130 ) To cancel the force of F1 applied to the first link (110).

Accordingly, the lateral forces F1 and F2 acting on the rear suspension are prevented from being offset by each other and twisted laterally, and the centers of the bushes 32 and 34 positioned at the ends of the trailing arms 22 and 24. This vehicle has a slope in the same direction as the steering direction of the vehicle, and has an understeer tendency due to its handling characteristics.

Meanwhile, referring back to FIG. 3B, when the rear wheels 42 and 44 move in the up and down directions while driving the vehicle, the link unit 100 rotates about the fourth connector 147 to move up, down, or laterally of the rear suspension. It has no effect in the direction.

As described above, the present invention has a technical idea of improving steering stability by offsetting a lateral force applied to the rear suspension during cornering driving, and may be modified as many as possible without departing from the spirit and concept of the present invention.

For example, the connector is represented by a bush or a ball joint, but is not limited thereto, and may be located where the positions of the first and second links 110 and 120 are opposite to each other.

That is, a structure in which the first link 110 is fixed to the lower side of the left trailing arms 22 and 24 and the second link 120 is fixed to the upper side of the right trailing arms 22 and 24 may be adopted. .

As described above, the present invention removes the lateral force applied to the rear suspension during cornering driving of the vehicle so that the handling characteristic becomes an understeer. Accordingly, the present invention cancels the lateral force applied to the rear suspension during cornering driving. The removal has the effect of allowing adjustment stability to be increased without lowering the riding comfort.

Claims (2)

In the rear suspension device of a vehicle provided with respective trailing arms (22, 24) which are respectively provided on the rear wheels on the left and right and connected and interlocked by the torsion beam shaft (10), The left and right trailing arms (22, 24) is connected to the rear suspension device of the vehicle, characterized in that further provided with a link unit (100) for mutually attenuating the lateral force generated during cornering driving. The first and second links 110 and 120 of claim 1, wherein the link unit 100 is connected to the left and right trailing arms 22 and 24, respectively. A third link 130 provided between the first and second links 110 and 120 and installed in the vehicle body to change and transfer the left and right lateral forces transmitted to the first and second links 110 and 120 in opposite directions, respectively; )Wow, And a plurality of connectors for connecting and fixing the first, second, third links (110, 120, 130) to the interconnection and trailing arms (22, 24) and the vehicle body, respectively.