KR20070094086A - Reinforcement structure of coupled torsion beam type suspension in vehicle - Google Patents

Abstract

A structure for reinforcing a coupled torsion beam type suspension in a vehicle is provided to prevent the breakage of welding portions and to improve the durability by welding after fitting a trailing arm to the end of a torsion beam axle. An assembling end(2) is formed at the end of a torsion beam axle(1), and a penetration hole is formed in the assembling end of the torsion beam axle to penetrate a trailing arm(4). The projection range of the assembling end is protruded from the trailing arm, and the deformation range is formed by flattening the assembling end for the torsion beam axle to form the elliptical hollow section in the assembling end. A welding line(3) is formed along the contact part of the trailing arm contacted to the penetration hole of the assembling end. The trailing arm is pressed and fitted to the penetration hole of the assembling end.

Description

Reinforcement structure of coupled torsion beam type suspension in vehicle}

1 is a configuration diagram of a reinforcing structure of a vehicle coupled torsion beam type suspension according to the present invention

Figure 2 is an enlarged view of the connection and reinforcement structure of the torsion beam axle and the trailing arm according to the present invention

3 is a side coupling view of FIG.

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

1: torsion beam axle 2: coupling end

3: welding line 4: trailing arm

5: Support Bracket

A: conventional torsion beam axle length B: present invention torsion beam axle length

C: protrusion section

The present invention relates to a vehicle coupled torsion beam type suspension device, and more particularly to a vehicle coupled torsion beam type suspension device having a reinforcing structure.

In general, the suspension system of the vehicle connects the axle to the body to appropriately attenuate vibrations or shocks received by the axle from the road surface while driving, thereby improving damage to the body and riding comfort of the occupant. This provides the flexibility to drive irregular roads while keeping the body unaffected by road roughness, while maintaining the wheels at the proper steering and camber positions relative to the road surface, as well as the horizontal and lateral forces and braking generated by the wheels. And to cope with the driving force and to suppress the rolling of the vehicle body.

The torsion beam type of such suspension system is a trailing arm type suspension system, also called a semi-rigid axle type, and it is a suspension type in which a left and right trailing arm is connected to a cross beam. Or pivot beam type or coupled beam type.

Double-coupled torsion beam type suspension is the middle of axle beam and pivot beam. It is also called cope-rankel axe. In this method, the movement at bounce is the same as the full trailing type, but at the time of roll It takes a semi trailing trajectory and combines the advantages of both.

Such a coupled torsion beam-type suspension is typically a shock absorber for buffering external forces generated from the road surface, a coupled torsion beam axle provided to connect both wheels, and parallel to the axle. It consists of a lateral rod that is controlled by a lower force and a pair of trail arms connected vertically to both sides of the axle to control the force of the front, rear, top, and bottom.

At this time, the coupled torsion beam axle is operated when both wheels are staggered to the left, right (up and down) and before and after, i.e., when the wheel center phase difference between the two wheels is generated (when roll). Torsion occurs at the distal end, which results in a torsional rigidity enhancement at both distal ends of the coupled torsion beam axle.

As an example, the end portion of the torsion beam axle is machined to match the cross-sectional shape of the trailing arm, and then the machining portion of the torsion beam axle is placed on the trailing arm and welded to fix it.

However, when the torsion beam axle and the trailing arm are fixed to each other by welding, there is a vulnerability that the durability is not sufficiently secured according to the welding quality.

To this end, an additional reinforcement member (usually four or more) is additionally provided between the torsion beam axle and the trailing arm, which are welded to each other. Even when using such a reinforcement structure, durability depends on the quality of the welding operation. In particular, the torsion and bending loads are generated according to the load received from the trailing arm in all directions during the driving, and thus, the weld part, which is a passage through which the load is transmitted, is broken or destroyed when the load is transmitted.

Accordingly, the present invention has been made in view of the above, and the torsion beam axle is welded along the entire circumference of the trailing arm to increase the welding contact surface while penetrating the trailing arm to enhance the connection rigidity with the trailing arm. The purpose of the present invention is to maintain sufficient fixation force even in the case of partial weld quality deterioration so as to improve the torsional rigidity and the bending rigidity.

The present invention for achieving the above object is a torsion beam axle connected to both side wheels while being installed in parallel to the lateral rod to control by the force of the left, right, up, down, and is connected perpendicularly to both sides of the axle Coupled torsion consisting of a pair of trailing arms that control the front, rear, top and bottom forces, and a chassis spring and shock absorber that cushions external forces generated from the road surface by being mounted on the support brackets coupled to the trailing arms. In the beam type suspension,

Combined ends forming both ends of the torsion beam axle form a through hole opened to allow the trailing arm to penetrate, and an end thereof forms a protruding section protruding from the trailing arm.

Forming a deformation section flattened by pressing the up and down side toward the torsion beam axle to a position beyond the area occupied by the trailing arm so that the cross section of the coupling end has a hollow long ellipse shape,

The welding line is formed by welding along the contact portion of the trailing arm in contact with the through hole of the coupling end.

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

1 is a block diagram of a reinforcing structure of a coupled torsion beam type suspension device for a vehicle according to the present invention, the present invention is a shock absorber for buffering the external force generated from the road surface, the left, right, top, bottom force Torsion beam axle 1 which is installed parallel to the lateral rod which receives and controls the torsional beam axle, and connected to both sides of the axle 1 perpendicularly to both sides of the axle 1 so as to control the force before, after, up and down. In a coupled torsion beam type suspension consisting of a pair of trailing arms 4 and a support bracket 5 coupled to the trailing arms 4,

The torsion beam axle 1 forms a through hole through which the trailing arm 4 opens and forms an engaging end 2 at which the tip protrudes from the trailing arm 4,

The coupling end 2 forms a deformation section L that is flattened by pressing up and down toward the torsion beam axle 1 so as to be formed out of an area occupied by the trailing arm 4, thereby forming a hollow long elliptical shape in cross section. ,

 The coupling end 2 is formed with a protruding section C protruding from the trailing arm 4 so that the torsion beam axle length B extends away from the trailing arm 4,

A welding line 3 is formed by welding the contact portion between the trailing arms 4 press-fitted into the coupling end 2.

Here, the welding line 3 is the coupling end 2 of the torsion beam axle 1 into which the trailing arm 4 is press-fitted to increase the welding length with the trailing arm 4 as shown in FIG. 2. Through-holes formed on both sides are made of an elliptical shape that goes deeper into the pressed portion of the coupling end (2).

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

As shown in FIGS. 1 and 2, the fastening structure between the torsion beam axle 1 and the trailing arm 4 constituting the coupled torsion beam type suspension device according to the present invention is the amount of the torsion beam axle 1. The trailing arm 4 is forced into the through-holes formed at both sides of the coupling end 2 while forming a hollow coupling end 2 that forms a rectangular elliptical shape by pressing a flat end length from the top to the bottom. It is possible to use a method of press-fitting to generate fixing forces with each other.

In this case, the contact portion between the trailing arm 4 and the coupling end 2 press-fitted into the through hole of the coupling end 2 is welded to form a welding line 3, which is illustrated in FIG. 2. As shown in FIG. 2, the indented trailing arm 4 is formed along a line contacting a through hole formed in the coupling end 2 forming both ends of the torsion beam axle 1, as shown in FIG. 2. The welding line (3) is made along a through hole made of an elliptical shape to go deeper into the pressed portion of the coupling end (2), the welding length between the trailing arm (4) and the torsion beam axle (1) is a circular cross section Increased when in shape.

Subsequently, after the trailing arm 4 is welded and fixed in the press-fitted state to the torsion beam axle 1, the support bracket 5 for the suspension components such as the chassis spring and the like is attached to the trailing arm 4 with bolts. It is combined using nuts and welding.

As such, the torsion beam axle 1 and the trailing arm 4 have a conventional torsion beam axle length A as long as the coupling end 2 of the torsion beam axle 1 protrudes from the trailing arm 4. As the torsion beam axle length (B) is increased compared to), the roll stiffness and bending stiffness of the torsion beam axle 1 are increased, as shown in FIGS. 1 and 3. There is no possibility of generating a gap of the welding line 3 by press-fitting and welding while penetrating the trailing arm 4, which not only improves the overall durability but also the coupling end 2 of the torsion beam axle 1. As the diameter and position of the through-holes formed are changed, the toe angle and the camber angle may be appropriately changed.

As described above, according to the present invention, since the trailing arm is press-fitted at the end portion of the torsion beam axle and welded, the welding arm is enlarged and the risk of breakage of the welded portion is eliminated. Will be.

In addition, the present invention is to form a through-hole without welding the end portion of the torsion beam axle without welding, and then press the trailing arm to weld, thereby improving the ease of welding, minimizing the welding process and simplify the overall process It will work.

Claims (3)

A torsion beam axle (1) connected to both wheels (W) and installed in parallel to the lateral rod that is controlled by the force of left, right, up, and down, and connected vertically to both sides of the axle (1) Chassis springs and shock absorbers mounted on a pair of trailing arms 4 for controlling the upper and lower forces and support brackets 5 coupled to the trailing arms 4 to cushion external forces generated from the road surface. In the coupled torsion beam type suspension composed of a back, A projecting section (C) having an end projecting from the trailing arm (4) while the coupling end (2) forming both ends of the torsion beam axle (1) forms a through hole opened through the trailing arm (4). Form the The cross section of the coupling end 2 forms a deformation section L that is flattened by pressing up and down toward the torsion beam axle 1 to a position outside the area occupied by the trailing arm 4 so as to form a hollow long ellipse shape. , Reinforcement structure of a coupled torsion beam type suspension device for a vehicle, characterized in that welding along the contact portion of the trailing arm (4) in contact with the through hole of the coupling end (2) to form a welding line (3). 2. The reinforcement structure of a coupled torsion beam type suspension system for vehicle according to claim 1, wherein the trailing arm (4) is press-fitted into the through hole of the coupling end (2). The reinforcement of a vehicle coupled torsion beam type suspension according to claim 1 or 2, characterized in that the through hole is formed in various shapes so as to increase the welding length of the welding line (3) forming the trailing arm (4). rescue.

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