KR20120017546A

KR20120017546A - Coupled torsion beam axle

Info

Publication number: KR20120017546A
Application number: KR1020100080199A
Authority: KR
Inventors: 신경훈
Original assignee: 현대모비스 주식회사
Priority date: 2010-08-19
Filing date: 2010-08-19
Publication date: 2012-02-29

Abstract

The torsion beam axle 3 of the present invention has a torsion beam 5 having an open cross section and a rear open structure facing toward the rear of the vehicle, and a downward open structure that is open to the underside and faces downward (ground direction) of the vehicle. The torsion bar 7 improves NVH and lateral stiffness characteristics with high stiffness, and the shear center Kc of the coupled torsion beam axle 3 exits the torsion beam 5 to It is formed at a position higher than the shear center Ka, so that the roll performance of the torsion bar 7 may be improved compared to when the cross section of the torsion bar 7 is closed.

Description

Coupled Torsion Beam Axle {Coupled Torsion Beam Axle}

The present invention relates to a coupled torsion beam axle, and more particularly to a coupled torsion beam axle in which the shear center of the torsion bar is formed higher than the shear center of the torsion beam.

In general, the coupled torsion beam axle forms a suspension component of the rear wheel and is composed of a torsion beam and a torsion bar connected to the trailing arms on both sides of the wheel in the transverse direction of the vehicle.

The torsion beam is press manufactured, and the end of the torsion beam and the torsion bar are fixed to the trailing arm by welding.

Torsion is generated in the torsion beam and the torsion bar, respectively, by the roll behavior of the vehicle, and the torsion occurs on the basis of each shear center of the torsion beam and the torsion bar.

However, since the torsion of the coupled torsion beam axle occurs based on the shear center of the torsion beam, the behavior of the vehicle is influenced by the position of the shear center of the torsion beam.

Typically, the torsion beam has a "> " shape, which is an open cross section when the vehicle center cross section is cut, while the torsion bar has a circular closed cross section and is positioned inward of the open cross section of the torsion beam.

Depending on the required properties, the " " shape, which is an open cross section of the torsion beam, can be set to face down, back or forward of the vehicle.

If the open cross section of the torsion beam is in the "∧" shape toward the bottom of the vehicle, the shear center is increased upward to improve the roll performance of the vehicle. However, if the open cross section is in the ">" shape toward the front of the vehicle, the shear center is It is relatively lowered downwards, which reduces the roll performance of the vehicle.

On the other hand, the torsion beam having the ">" shape is relatively rigid compared to the torsion beam having the "∧" shape, thereby improving vehicle NVH characteristics and lateral stiffness.

As described above, the vehicle roll characteristics and NVH / lateral stiffness characteristics of the coupled torsion beam axle depend on the direction of the open cross-sectional shape of the torsion beams. It cannot be improved.

That is, in the case of the coupled torsion beam axle as described above, the vehicle roll characteristic and the NVH / lateral stiffness characteristic are difficult to be parallel to each other, such that the vehicle roll characteristic must be reduced to increase the vehicle roll characteristic. In order to give up other characteristics.

Accordingly, the present invention in view of the above point is to deform the torsion bar into an open cross section so that the shear center is positioned relatively high upward even in a ">" shape in which the open cross section of the torsion beam faces the front of the vehicle. The aim is to provide a coupled torsion beam axle that improves and at the same time improves NVH / lateral stiffness characteristics.

The present invention for achieving the above object in the coupled torsion beam axle consisting of a torsion beam and a torsion bar arranged in the inner space of the torsion beam,

The torsion beam has an open cross section and has a rear open structure (>) facing the rear side of the vehicle, and the torsion bar has a cross section open cross section and a downward open structure facing the lower side (ground direction) of the vehicle. do.

The torsion bar is closer to the opening of the open section of the torsion beam and is arranged in a raised position relative to the intermediate position of the torsion beam.

The downward open structure of the torsion bar has a cup shape having a gentle curve.

In the present invention, the sheer center of the torsion beam of the ">" shape of which the open section faces the front of the vehicle is only relatively higher upward, thereby improving the vehicle roll characteristics and NVH / lateral stiffness characteristics simultaneously. In addition to reducing the overall weight of the torsion beam axle, it is also possible to change the material from spring steel to high-tensile steel sheet, thereby reducing the cost.

1 is a configuration diagram of a coupled torsion beam axle according to the present invention, Figure 2 is a modification of the coupled torsion beam axle according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

1 shows a configuration of a coupled torsion beam axle according to the present invention.

As shown, the coupled torsion beam axle 3 to which the trailing arm 1 is fastened to both ends is a torsion beam 5 and a torsion bar 7 arranged as an inner space of the torsion beam 5. It is composed.

The torsion beam 5 is a rear open structure (>) which is open in cross section and faces toward the rear of the vehicle, and the torsion bar 7 is a open end in which the torsion bar 7 is open in cross section and faces downward (ground direction) of the vehicle ( Iii).

The torsion bar 7 is further approached above the opening of the open cross section of the torsion beam 5 and arranged in an elevated position relative to the intermediate position of the torsion beam 5.

If the torsion beam 5 is an open cross section and has an open structure as in this embodiment, its rigidity is high, and thus NVH and lateral stiffness characteristics are improved.

In addition, in this embodiment, the shear center (Ka) of the torsion beam 5 and the shear center Kb of the torsion bar 7 are each bent at a bent portion to form an open structure. Since it is located, the shear center Kb of the torsion bar 7 has a higher position than the shear center Ka of the torsion beam 5.

That is, the torsion beam 5 and the torsion bar 7 are due to the respective shear centers Ka and Kb.

Accordingly, the coupled torsion beam axle 3 consisting of the torsion beam 5 and the torsion bar 7 having respective shear centers Ka and Kb has a shear center Kc and a torsion beam 5. It is formed at a position outside the.

For example, when the distance from the shear center Ka of the torsion beam 5 to the shear center Kb of the torsion bar 7 is A, the shear center of the coupled torsion beam axle 3 ( Kc) is located at a distance B not greater than the distance A.

That is, the shear center Kc of the coupled torsion beam axle 3 is located between the shear center Ka of the torsion beam 5 and the shear center Kb of the torsion bar 7, and the torsion It is formed slightly below the shear center Kb of the bar 7.

As described above, the shear center Kc of the coupled torsion beam axle 3 is formed at a position higher than the shear center Ka of the torsion beam 5 by leaving the torsion beam 5. In (3), the improved roll performance is realized as compared with the closed cross section of the torsion bar 7.

2 shows a modification of the coupled torsion beam axle according to the present invention.

As shown, the coupled torsion beam axle 3 has a torsion beam 5 having an open cross section and a rear open structure (>) facing the rear side of the vehicle, and a cross section open cross section and a lower side of the vehicle (ground direction). Consisting of the torsion bar 70 is a downward open structure toward the (), the downward open structure of the torsion bar 70 is made of a cup (∩) shape having a gentle curve rather than a wedge (∧) shape.

Therefore, the coupled torsion beam axle 3 also has an open cross-section and an open structure of the torsion beam 5, so that its rigidity is high, thereby improving NVH and lateral stiffness characteristics.

In addition, since the torsion bar 70 constituting the coupled torsion beam axle 3 has a downwardly open structure formed in a cup shape having a gentle curve, the shear center Kc of the coupled torsion beam axle 3 is provided. Is formed at a position outside the torsion beam 5.

However, since the open structure of the torsion bar 70 forms a cup shape having a gentle curve, the shear center Kc of the coupled torsion beam axle 3 is an open structure of a wedge shape. It is formed at a position higher than the shear center Kb of the torsion bar 70 compared to the torsion bar 7.

That is, when the distance to the shear center Kb of the torsion bar 70 is A based on the shear center Ka of the torsion beam 5, the shear center Kc of the coupled torsion beam axle 3 is referred to as A. ) Is located at a distance C greater than the distance A.

Therefore, even in this embodiment, the coupled torsion beam axle 3 has a better roll performance than when the cross section of the torsion bar 70 is closed, and the torsion bar 7 having a wedge-shaped open structure. Compared with), improved roll performance is realized.

1: trailing arm 3: coupled torsion beam axle
5: torsion beam 7, 70: torsion bar
Ka, Kb, Kc: Shear Center

Claims

In the coupled torsion beam axle consisting of a torsion beam and a torsion bar arranged in the inner space of the torsion beam,
The torsion beam has an open cross section and has a rear open structure (>) facing the rear side of the vehicle, and the torsion bar has a cross section open cross section and a downward open structure facing the lower side (ground direction) of the vehicle. Coupled torsion beam axle.

The coupled torsion beam axle of claim 1, wherein the torsion bar is further approached over an opening in an open cross section of the torsion beam and is arranged in a raised position relative to an intermediate position of the torsion beam.

The coupled torsion beam axle of claim 1, wherein the downward open structure of the torsion bar is formed in a cup shape having a gentle curve.