JP2003025821A - Suspension manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension manufacturing method which can easily adjust a roll steer and avoid wastes of the material. SOLUTION: A torsion beam 8 for giving the roll rigidity is fitted to a pair of arm members 1 and 2 supported by a vehicle body in an oscillating manner. The cylindrical torsion beam 8 is cut between the pair of arm members 1 and 2 along the longitudinal direction, and a cut-out member 24 which is cut out of the torsion beam 8 is welded to the torsion beam 8 when forming an opening part 22. The opening part 22 is opened downwardly, and the cut-out member 24 is welded to the outer circumference of the torsion beam 8 on the side opposite to the opening part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a torsion beam type suspension.

[0002]

2. Description of the Related Art Conventionally, as a torsion beam used in a torsion beam type suspension, for example, one disclosed in Japanese Patent No. 3056178 is known. This suspension is of an intermediate beam type as shown in FIG. 4, and the trailing arm 101 is provided with a protruding portion protruding in a convex shape toward the torsion beam 106 between the pivot attachment member 103 and the wheel support member 104. Has been done. This protrusion is formed by the torsion beam 106.
The trailing arm 101 and the torsion beam 106 are connected to each other by being welded to the open end of the wire and welding the entire circumference of the open end.

Further, the torsion beam 106 is formed with an opening groove 107 extending along the vehicle width direction. The open cross-section portion of the torsion beam 106 in which the opening groove 107 is formed has lower torsional rigidity and is more flexible than the closed cross-section portion in which the opening groove 107 is not formed. Therefore, for example, when centrifugal force acts on the vehicle body and the vehicle body leans, and both left and right wheels make strokes in opposite directions with respect to the vehicle body, this open cross section is mainly twisted, and a reaction force proportional to the roll rigidity of the torsion beam 106 is generated. Occur.

[0004]

However, in such a conventional suspension manufacturing method, the roll stiffness is controlled by cutting out a part of the torsion beam 106 and changing the cross-sectional shape. Therefore, the roll steer is adjusted. However, there is a problem that the material is wasted and the waste of material is great.

An object of the present invention is to provide a method of manufacturing a suspension in which the roll steer can be easily adjusted and waste of materials is eliminated.

[0006]

In order to achieve the above object, the present invention takes the following means in order to solve the object. That is, a pair of arm members swingably supported by the vehicle body,
In a method of manufacturing a suspension in which a torsion beam that imparts roll rigidity is attached and formed, an opening is formed by cutting the tubular torsion beam between the pair of arm members along a longitudinal direction, and forming the opening. At that time, a cutout member cut out from the torsion beam is welded to the torsion beam, which is a method for manufacturing a suspension.

A wheel support member for supporting the left and right wheels may be attached to the torsion beam. Alternatively, the opening may be opened downward. Further, the cutout member may be welded to the torsion beam on the side opposite to the opening.
Further, the cutout member may be welded to the outer circumference of the torsion beam.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, reference numerals 1 and 2 denote a pair of left and right arm members, and pivot mounting portions 4 and 6 are integrally formed at one end of the arm members 1 and 2. In the present embodiment, the pivot attachment portions 4 and 6 are swingably fitted to a vehicle body (not shown) around an axis orthogonal to the traveling direction of the vehicle so that both arm members 1 and 2 are swingably supported. Has been done.

Reference numeral 8 is a torsion beam, and the cross section of the torsion beam 8 is cylindrical. In addition, it is not limited to a cylindrical shape,
It may have an elliptic cylindrical shape. The torsion beam 8 has a straight line portion 8a having a substantially central portion extending in the vehicle width direction.
And an end portion 8b whose both ends extend toward the rear of the vehicle, and a linear portion 8
It has an arcuate portion 8c bent in an arcuate shape between a and the end portion 8b, and is formed in a substantially "U" shape.

One ends of the arm members 1 and 2 are welded to both arc portions 8c of the torsion beam 8, respectively. Wheel support members 14 and 16 for supporting the left and right rear wheels 10 and 12 are attached to the end portions 8b on both sides. Spring seat members 18 and 20 are attached across the end portion 8b and the arc portion 8c.

Further, as shown in FIGS. 2 and 3, the linear portion 8a of the torsion beam 8 is provided with an opening 22 along the longitudinal direction of the linear portion 8a. The opening 22 is formed by cutting out the straight portion 8a by gas cutting, laser cutting, or the like, and is formed so as to open downward in the vehicle. The opening 22 is formed in the linear portion 8a between the arm members 1 and 2.

When the opening 22 is formed, the cutout member 24 cut out from the straight portion 8a is welded to the outer periphery of the straight portion 8a opposite to the opening 22 by welding. At this time, the cutout member 24 may be formed by cutting off both ends.
The cutout member 24 is not limited to being welded to the outer periphery of the straight line portion 8a, and as shown by the two-dot chain line in FIG.
It may be welded to the inner circumference.

When the centrifugal force of the vehicle acts, the vehicle rolls around the shearing center 26, and the left and right rear wheels 10, 12 move in the opposite direction with respect to the vehicle body. As a result, the arm members 1 and 2 swing around the pivot mounting portions 4 and 6, and the linear portion 8a is twisted, and a reaction force corresponding thereto is generated.

By forming the opening 22, the linear portion 8a is easily twisted and deformed, and the linear portion 8a can be imparted with an appropriate torsional rigidity against the roll. Further, by welding the cutout member 24 to the linear portion 8a, the torsional rigidity of the linear portion 8a is improved, so that the roll rigidity is increased. By adjusting the welding position of the cutout member 24, the roll rigidity changes and the shear center 2
The position of 6 also changes. Therefore, since the roll steer of the vehicle also changes, the roll steer can be adjusted.

Further, even if the thickness of the torsion beam 8 is made thin, the roll rigidity can be increased and the weight can be reduced by welding the cutout member 24.
In addition, since the cut-out cutting member 24 is welded, the material is not wasted. The present invention is not limited to such an embodiment as described above, and can be implemented in various modes without departing from the scope of the present invention.

[0016]

As described above in detail, according to the method of manufacturing a suspension of the present invention, the roll steer of a vehicle can be adjusted by adjusting the welding position of the cutout member, and the cutout cutout member is welded. Because
This has the effect that there is no waste of material.

[Brief description of drawings]

FIG. 1 is a plan view of a suspension according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view in which a part of the torsion beam of the present embodiment is cut away.

FIG. 4 is a perspective view of a conventional suspension.

[Explanation of symbols]

1, 2 ... Arm member 4, 6 ... Pivot mounting part 8 ... torsion beam 8a ... straight part 8b ... end portion 8c ... arc portion 10, 12 ... Rear wheel 14, 16 ... Wheel support member 22 ... Opening 24 ... Cutout member 26 ... Shear center

Claims (5)

[Claims] 1. A method of manufacturing a suspension in which a torsion beam for imparting roll rigidity is attached to a pair of arm members swingably supported by a vehicle body, and the pair of cylindrical torsion beams are provided along the longitudinal direction. A method for manufacturing a suspension, characterized in that a notch is formed between the arm members to form an opening, and a cutout member cut out from the torsion beam is welded to the torsion beam when the opening is formed. 2. The method of manufacturing a suspension according to claim 1, wherein a wheel support member that supports left and right wheels is attached to the torsion beam. 3. The method of manufacturing a suspension according to claim 1, wherein the opening is opened downward. 4. The method of manufacturing a suspension according to claim 1, wherein the cutout member is welded to the torsion beam on the side opposite to the opening. 5. The method for manufacturing a suspension according to claim 1, wherein the cutout member is welded to the outer circumference of the torsion beam.