KR20140063968A

KR20140063968A - Coupled torsion beam axle for vehicle

Info

Publication number: KR20140063968A
Application number: KR1020120130739A
Authority: KR
Inventors: 김주완
Original assignee: 현대자동차주식회사
Priority date: 2012-11-19
Filing date: 2012-11-19
Publication date: 2014-05-28

Abstract

The present invention relates to a coupled torsion beam axle often used as a rear wheel suspension for small or medium-sized vehicles. The present invention provides a coupled torsion beam axle of a vehicle capable of ensuring optimal performance in view of the R&H performance and the durability; is very advantageous to tune suspension characteristics by free design parameters as a new type of torsion bar consisting of two plates and two joining lines to form a closed cross section acting as a torsion bar; and a torsion beam axle integrated with the torsion bar implemented in order to overcome the limitations to change the design in the existing beam structure.

Description

Coupled torsion beam axle for vehicle < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupled torsion beam axle of an automobile, and more particularly, to a coupled torsion beam axle widely used as a rear wheel suspension of a small-sized passenger car.

Generally, a suspension device of a vehicle is a device that prevents damages to the car body or cargo and improves the ride quality by preventing vibrations or shocks from the road surface from being directly transmitted to the vehicle body when driving.

That is, the suspension system of an automobile provides flexibility in the up-and-down direction to allow an irregular road surface to run without being affected by the roughness of the road surface, to maintain the steering wheel in a proper steering and camber position with respect to the road surface, And lateral force, braking and driving force generated by the vehicle body, and also suppress rolling of the vehicle body.

These suspension devices include an axle beam type, a pivot beam type, a coupled torsion beam axle type, and the coupled torsion beam axle is a suspension device widely used as a rear wheel suspension of a small passenger car.

Such a coupled torsion beam axle type suspension device is disclosed in Korean Patent Laid-Open Nos. 10-2005-0093103, 10-2007-0063844, 10-2009-0049276, and 10-2012-0050232 &Lt; / RTI > are disclosed.

Generally, a coupled torsion beam axle type suspension device includes a pair of trailing arms disposed on the left and right sides of the vehicle body in the front-rear direction of the vehicle body, and both ends of the trailing arms are coupled to a pair of trailing arms Coupled shock absorbers and shock absorbers that absorb external forces generated from the road surface, lateral rods and stabilizers that are controlled by vertical and lateral forces, and the like.

Here, the coupled torsion beam axle is advantageous in that it can exhibit the suspension performance efficiently at a low cost because of its simple structure. By using a beam and a torsion bar (a member added for reinforcing the torsional rigidity) .

Up to now, as shown in Fig. 1, such a coupled torsion beam axle mainly employs a V-shaped (a) or U-shaped, a V-shaped + torsion bar (b), and a tubular type (c).

These various types of coupled torsion beam axles have a downward / forward / backward open structure in accordance with the open direction of the beam. Depending on the shape and configuration of the beam open direction, fuel consumption due to difference in flow blur, , Torsional rigidity, longitudinal and bending rigidity, shear center position (tuning specifications for ride comfort and running performance adjustment), durability performance, weight, and cost.

For example, in the case of the V type, the sheer center is high, but the roll stiffness is the smallest and the durability performance is relatively low.

In addition, in the case of V-type + torsion bar, the beam thickness becomes thinner by adding a torsion bar, the roll stiffness is larger but the shear center is lowered and the endurance performance is more advantageous than the V-type.

In the case of the tubular type, the roll stiffness is high and the shear center is high, but the thickness of the plate is thin, so that the durability of the weld portion is the most disadvantageous (the endurance of the weld portion is affected by the plate thickness rather than the material).

Among these mutual advantages and disadvantages, the designer chooses a specific beam type according to its characteristics.

However, the existing beam structure has many limitations in design when selecting a specific shape type, and there are many limitations in the structure improvement for changing the tuning specifications (rigidity in each direction, sheer center, etc.) have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a new type of beam structure having two plates and two joining lines for forming a closed end serving as a torsion bar The torsion beam axle with torsion bar and torsion bar can achieve the best performance in terms of R & H performance and durability. In addition, the car's coupled torsion beam axle, which is very advantageous for tuning the suspension characteristics with free design parameter adjustment, The purpose is to provide.

In order to achieve the above object, the present invention provides a coupled torsion beam axle of an automobile as follows.

The coupled torsion beam axle is disposed across the wheels of the vehicle in a rear wheel suspension of an automobile to absorb a torsional stress on the movement of the wheel and absorbs the impact. The first torsion beam axle has a torsion- The first torsion beam and the second torsion beam are arranged so as to face each other while being joined together at both ends to form a closed end face serving as a torsion bar, So that they can be formed together.

Therefore, the coupled torsion beam axle can secure an optimum endurance performance and R & H performance, and is characterized by favorable suspension characteristic tuning by selection of free design parameters.

Here, it is preferable that the first torsion beam and the second torsion beam of the coupled torsion beam axle have the same thickness, or one of the first torsion beam and the second torsion beam has a relatively thick thickness .

The first torsion beam and the second torsion beam of the coupled torsion beam axle may have various combinations of cross-sections. For example, the first torsion beam and the second torsion beam of the coupled torsion beam axle may have a tilted structure symmetrical with respect to a width direction longitudinal section, A curved structure, a curved structure curved toward either one of the widthwise longitudinal sides, and the like.

The coupled torsion beam axle of the automobile provided in the present invention has the following advantages.

First, U type, V type + Torsion bar, Tubular type, etc., can achieve the best performance in terms of endurance performance and R & H performance.

Second, design parameters for optimizing performance, weight, cost, and shape are very freely selected, and performance tuning is not restricted.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram illustrating several cross-sectional configurations for a conventional coupled torsion beam axle;
2 is a perspective view illustrating a coupled torsion beam axle according to an embodiment of the present invention.
3 is a perspective view showing a state of attachment of a coupled torsion beam axle according to an embodiment of the present invention;
4 is a schematic diagram illustrating various cross-sectional shapes of a coupled torsion beam axle in accordance with an embodiment of the present invention;

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

FIG. 2 is a perspective view showing a coupled torsion beam axle according to an embodiment of the present invention, and FIG. 3 is a perspective view illustrating an installed state of a coupled torsion beam axle according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the coupled torsion beam axle includes two torsion beam axle suspensions each of which forms a closed end serving as a torsion bar using two joining lines, .

To this end, a first torsion beam 11 and a second torsion beam 12 of a constant length, each having a forming section 10a, 10b at the front end in the width direction, that is, a forming section having a concave longitudinal section shape, At this time, the first torsion beam 11 and the second torsion beam 12 are arranged side by side and joined together to form an integral structure in which one side is opened, for example, the lower side is opened.

That is, the first torsion beam 11 and the second torsion beam 12 are formed in the respective embedding type forming sections 10a and 10b with their embedding type forming sections 10a and 10b facing upward, The first torsion beam 11 and the second torsion beam 12 are arranged so that the first torsion beam 11 and the second torsion beam 12 are arranged in two places, The welding lines 14a and 14b form one integral structure.

At this time, various methods such as a method of welding, a method of using a structural adhesive, or the like can be applied as a method of joining both ends of the concave forming sections 10a and 10b.

The torsion beam forming part 10a formed in the first torsion beam 11 may be concave upward and the concave forming part 10b formed in the second torsion beam 12 may be formed as a concave shape. Can be formed in a concave shape downward.

Accordingly, the concave forming section 10a of the first torsion beam 11 and the concave forming section 10b of the second torsion beam 12 are vertically arranged and combined so as to face the concave portions of the first and second torsion beams 11 and 12 The closed end face 13 having a predetermined space can be formed inside the concave forming sections 10a and 10b.

The closed end face 13 is formed to extend along the entire length of the first torsion beam 11 and the second torsion beam 12 in parallel to each other along the longitudinal direction. And can act as a bar.

The longitudinal torsion beams 10a and 10b of the first torsion beam 11 and the second torsion beam 12 can be formed in various shapes such as a V-shape or a U-shape.

The two torsion beams 11 and 12 are combined to form a closed-end surface 13. The two torsion beams 11 and 12 are combined to form a closed- The de-torsion beam axle is a downwardly open type, and the beam open shear center (roll center) of the other open type is high, so that it is easy to realize the understeer characteristic, thereby ensuring high adjustment stability.

Generally, the coupled torsion beam axle is structurally designed to be a balanced steering by increasing the understeer characteristic because of its strong oversteer characteristic. Thus, the coupled torsion beam axle according to the present invention has an optimal structure for implementing such a balanced steering I have.

Since the joint structure between the coupling torsion beam axle side and the trailing arm side is the most important part durably because it receives both the untrimming and the backward and forward bending and the vertical bending, That is, the cross-sectional structure formed by two beam combinations of the downward open type sharing the closed end face, can secure the durability against the joint portion with the trailing arm side.

As described above, the coupled torsion beam axle of the present invention is advantageous not only in the roll rigidity but also in the shear center, and in the cross-sectional area in which the thickness of the plate material is the same as the "V" type and is joined to the trailing arm. do.

This coupled torsion beam axle is installed in a structure in which the trailing rocks 15 on both wheel sides are disposed and joined across the vehicle width direction.

That is, a beam composed of the combination of the first torsion beam 11 and the second torsion beam 12 is disposed between the two trailing arms 15, and in such a state that both ends of the beam are positioned on the inner side of the trailing arm 15 So that the trailing arm 15 and the coupled torsion beam axle can be formed into an integral structure.

4 is a schematic diagram illustrating various cross-sectional shapes of a coupled torsion beam axle in accordance with an embodiment of the present invention.

As shown in Fig. 4, here, various cross-sectional shapes of the coupled torsion beam axle are shown.

The conventional beam has a very limited design shape parameter such as the thickness and the cross sectional area, but the coupled torsion beam axle of the present invention can have a structure with a high degree of freedom in design with a wide range of design factor changes.

That is, the coupled torsion beam axle structure of the present invention can have two plates independently of one another, and the shapes can also be symmetrical or asymmetrical with respect to each other (in particular, the durability of the rear joint is weak, It is easy to secure durability without plate).

In addition, the coupled torsion beam axle structure of the present invention can easily change the section characteristics by the change of the simple forming and the trim line without changing the mold, and the sectional area of the shear center can be easily changed.

For example, the first torsion beam 11 and the second torsion beam 12 may have a symmetrical tilting structure with respect to a width direction longitudinal section as a basic cross-sectional shape (a).

In addition, the first torsion beam 11 and the second torsion beam 12 can be formed in a curved structure bent at either one of the widthwise longitudinal sides.

The first torsion beam 11 and the second torsion beam 12 have the same thickness or the first torsion beam 11 and the second torsion beam 12 have a relatively thick thickness .

The thickness of the first torsion beam 11 is greater than the thickness of the second torsion beam 12 or the thickness of the second torsion beam 12 is greater than the thickness of the first torsion beam 11, (D) It can be made thicker.

In addition, the first torsion beam 11 and the second torsion beam 12 can be formed into a curved structure having a symmetrical shape with respect to the longitudinal direction of the width direction (e).

As described above, the coupled torsion beam axle of the present invention is composed of the two plate members and the torsion beam integral structure including two joint lines for constituting the closed end surface serving as the torsion bar, It can have the best advantageous shape characteristic, and it can have high design freedom by changing a wide range of design factors.

10a, 10b: concave-shaped forming portion 11: first torsion beam
12: second torsion beam 13: closed end face
14a, 14b: joint line 15: trailing arm

Claims

A rear wheel suspension system for a motor vehicle, comprising: a rear wheel suspension device disposed on a rear wheel suspension of an automobile, the rear wheel suspension device being disposed across the two wheels to absorb a torsional stress on the movement of the wheel,
The first torsion beam 11 and the second torsion beam 12 having the concave forming sections 10a and 10b at their tip ends in the width direction are arranged side by side and joined together, Shaped forming sections 10a and 10b of the first torsion beam 11 and the second torsion beam 12 are disposed opposite to each other and joined together at both ends to form a closed end face 13 serving as a torsion bar Couple de Torsion beam axle of the car.

The method according to claim 1,
The first torsion beam 11 and the second torsion beam 12 may have the same thickness or the first torsion beam 11 and the second torsion beam 12 may have a relatively thick thickness Couple de torsion beam axle of car which is characterized.

The method according to claim 1,
Characterized in that the first torsion beam (11) and the second torsion beam (12) are of a tilted structure symmetrically with respect to a width direction longitudinal plane.

The method according to claim 1,
Wherein the first torsion beam (11) and the second torsion beam (12) have a curved structure symmetrical with respect to a width direction longitudinal plane.

The method according to claim 1,
Characterized in that the first torsion beam (11) and the second torsion beam (12) are of a curved structure curved in either one of the transverse longitudinal plane.