KR20040040063A - A lower arm in suspension system for automobile - Google Patents

Abstract

PURPOSE: A lower arm of a suspension for a vehicle is provided to prevent collision or accidents from breakage of a knuckle or a tie rod by restricting shock with breaking the assembling portion of the body and the rigid body against lateral impact. CONSTITUTION: A lower arm of a suspension of a vehicle is composed of a body(10) combined with a vehicle body and composed of a space communicated with an opening part, and a rigid body(20) inserted to the body and combined with the knuckle of the wheel. The body is combined with the rigid body by a buffer unit to absorb longitudinal impact of the rigid body. The buffer unit has a comb tooth deformation part(12) deformed easily by impact of the opening part, a taper part(21) narrowed for the opening part, and a bellows pipe(22) extended and contracted longitudinally. The taper part of the rigid body is fitted to the opening part, and assembling force is improved by residual stress of the comb tooth deformation part.

Description

Lower arm in suspension system for automobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower arm of a suspension for automobiles, and more particularly, to a suspension of automobiles having a structure that can prevent other important parts connected to the lower arm from being damaged by the lateral impact applied to the suspension. It relates to the lower arm of the device.

In general, the suspension of the vehicle is an important device for promoting the ride comfort and driving stability of the vehicle, the main function of such a suspension system to stably support the body from the wheel, while suppressing and rapidly reducing the vibration provided from the wheel Function.

Here, looking at the lower arm 110 used in the front suspension as a member that functions to connect the wheel to itself, as shown in FIG. 1, the A point bush 102 is formed on the vehicle body 100. And the point bush 104 is connected, and at point B, the ball knuckle is connected to the knuckle of the wheel to support the wheel together with the upper arm, and the stabilizer is also connected.

As shown in FIG. 2, the lower arm 110 has an opening formed at one side thereof, and a main body 112 having an inner receiving space communicating with the opening, and one end of the lower arm 110. It consists of a rod-shaped rigid body 114 which is inserted into the opening and fastened to the main body 112 by bolting at three points P1 to P3.

However, when a lateral impact is applied to the front suspension due to a sharp cornering or slip, the tie rod of the steering wheel connected to the wheel or the knuckle of the wheel connected to the lower arm or the lower arm may be damaged depending on the rigidity and structure of the suspension. Can be.

If the knuckle of the dual wheel is broken, the driving stability is lost, especially if the tie rod is broken, the worst situation occurs that the steering is impossible, but the lower arm is best damaged, but in reality the rigidity of the lower arm is the knuckle of the wheel. Since it is larger than the tie rod and the transverse impact is applied, there is a problem that a large accident such as a collision accident or rollover accident occurs because the knuckle or tie rod of the wheel is broken.

Accordingly, an object of the present invention is to provide a lower arm of a suspension device for a vehicle having a structure capable of attenuating a lateral impact.

1 is an exploded perspective view showing the installation structure of a general lower arm,

2 is a plan view of the lower arm shown in FIG.

3 is a plan view showing a lower arm of a suspension device for a vehicle according to a preferred embodiment of the present invention;

4 is an enlarged perspective view illustrating an opening of the lower arm body illustrated in FIG. 4;

5 is a view illustrating the lower arm shown in FIG. 3 separately;

FIG. 6 is a view illustrating a state in which the lower arm illustrated in FIG. 3 is assembled;

7 is a view illustrating a state in which the engaging portion of the lower arm body and the rigid body is deformed when a lateral impact is applied.

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

10: body 11: opening

12: deformation portion 20: rigid body

21: taper 22: corrugated pipe

B: bolt

The lower arm of the suspension device for automobiles according to the present invention for achieving the above object is coupled to the other end of the main body and the other end is inserted into the opening of the main body and the other end is fastened to the vehicle body and communicates with the opening of one side It is composed of a rigid body fastened to the knuckle side of the wheel, characterized in that the body and the rigid body is coupled via a buffer means for absorbing the longitudinal impact of the rigid body.

In addition, the present invention, the buffer means, the deformation portion formed in the shape of a comb so that deformation is easily made by the impact on the opening of the main body, and the opening side direction to the site of the rigid body in contact with the opening of the main body in a coupled state Tapered portion formed so as to narrow, and the corrugated pipe is formed in a predetermined portion of the rigid body in the form of pipes on the outer circumferential surface is possible to stretch to a certain degree in the longitudinal direction is another feature.

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

Figure 3 is a plan view showing a lower arm of a suspension device for a vehicle according to a preferred embodiment of the present invention, as can be seen with reference to the drawing, the lower arm according to the present invention, A point and G point is fastened to the vehicle body The main body 10 having an inner receiving space communicating with the opening 11 on one side, and one end is inserted into the main body 10 to fasten the bolt (Bt) and the other end (B point) to the knuckle side of the wheel It is composed of a rigid body 20.

Here, in the opening 11 of the main body 10, as shown in FIG. 4, the comb-shaped deformation | transformation part 12 is formed so that deformation may be performed easily by an impact.

Then, the rigid body 20, as shown in Figs. 5 and 6, the tapered portion (taper) narrowed in the opening 11 side direction at the portion in contact with the opening 11 of the main body 10 in the engaged state ) 21 is formed, the outer circumferential surface in the form of a pipe in the portion accommodated into the main body 10 is formed in a corrugated shape is formed with a corrugated pipe 22 that can be stretched within a certain distance in the longitudinal direction.

Here, the tapered portion 21 of the rigid body 20 is coupled to the opening 11 of the main body 10 by fitting, the coupling force becomes stronger due to the residual stress due to the comb shape of the deformation portion 12. .

For example, the rigid body 20 is preferably made of an aluminum alloy material having a greater rigidity than steel.

Referring to the effects of the present invention configured as described above are as follows.

When a lateral impact is applied to the lower arm, the impact is attenuated by the corrugated pipe 22 of the rigid body 20 when the impact amount is a small impact of less than a predetermined range.

If the impact in the transverse direction is more than a predetermined range, the deformable portion 12 of the lower arm main body 10 is opened while the corrugated pipe 22 of the rigid body 20 contracts.

In other words, if a lateral impact of a large force is applied to the suspension system, the lower arm breaks first and blocks the impact before the impact is transmitted to the knuckle or tie rod of the wheel, thereby breaking the knuckle or tie rod of the wheel. To prevent them.

The present invention is described above by illustrating specific embodiments, but the present invention is not limited to the above embodiments. Those skilled in the art can easily make various changes and modifications to the present invention, and it should be noted that such variations or modifications are included within the scope of the present invention as long as the features of the present invention are used.

As described above, the lower arm according to the present invention breaks the impact by breaking the engagement portion of the main body and the rigid body against the impact applied in the lateral direction, and thus the knuckle and tie of the wheel by the lateral impact applied to the suspension device. There is an effect that can prevent damage to important components such as rods.

Therefore, by using the present invention, even if a large impact in the lateral direction is applied to the suspension device while driving the vehicle, it is possible to prevent a large accident such as a collision or rollover caused by damage to the knuckle or tie rod of the wheel.

Claims (3)

Lower arm of the suspension device for automobiles, which consists of a main body having an inner receiving space connected to the vehicle body and communicating with an opening on one side, and a rigid body having one end inserted into the opening of the main body and the other end fastened to the knuckle side of the wheel To The body and the rigid body is a lower arm of the suspension device for automobiles, characterized in that coupled via a buffer means for absorbing the longitudinal impact of the rigid body. According to claim 1, wherein the buffer means, Deformation portion formed in the shape of a comb so that deformation is easily made by the impact on the opening of the main body, A tapered portion formed to be narrowed toward the opening side in a portion of the rigid body in contact with the opening of the main body in a coupled state; The lower arm of the suspension device for a vehicle, characterized in that the corrugated pipe is formed in a predetermined portion of the rigid body on the outer circumferential surface and made of a corrugated pipe that can be stretched to a certain extent in the longitudinal direction. The lower arm of claim 2, wherein the rigid body is made of an aluminum alloy having high rigidity.