Torsion beam suspension

Abstract

Torsional beam type suspending rack is provided in the present invention. In the torsional beam type suspending rack making opening end face of towing arm and main shaft supporting plate butt welding, on the front end of the main shaft supporting plate (13) plate main body (13M), integrated connecting a front side bending flange (13F) extending along the back end external side of the towing arm (10) towards front and front end edge welding (W3) at the back end external side, and at the plate main body (13M) back end integrated connecting a rear side bending flange (13R) clamping and welding (4W) at the rear end edge of the towing arm (10). The main shaft substrate (14b) is overlapped and fixed (W2) on the external side of the plate main body (13M), and has four screw hole parts (Sfu, Sfd, Sru, Srd) at the front and back and un and down of the maid shaft axes separating the main shaft axes, the screw hole parts is used for combining the plate shape component (P) associated with the braking device and the bolt used for the main shaft substrate (14b), therefore, it can restrain effect of welding thermal strain, and can make the main shaft supporting plate thin-wall to realize light weight and lower cost.

Description

technical field [0001] The present invention relates to a torsion beam type suspension that connects left and right trailing arms that extend approximately in the front-rear direction of the vehicle body and swing up and down, and both ends of a torsion beam that extends approximately in the left-right direction of the vehicle body. The main shaft for pivotally supporting the wheels is fixed on the main shaft supporting plate welded to the left and right trailing arms. Background technique [0002] This torsion beam type suspension is conventionally known, for example, as described in the following patent document 1. In the torsion beam type suspension, since the trailing arm is made into a hollow tube shape, the cross section can be obtained using relatively low-cost production equipment. Efficient closed-section arm construction. [0003] However, in this known torsion beam suspension, in order to separate the weld joint from the spindle mounting surface to reduce the inf...

AI Technical Summary

Problems solved by technology

According to the above, since the main shaft support plate adopts a remarkably thick plate structure, when the product is to be provided by press punching, a large special press processing facility is required to cause a substantial cost increase, and when it is to be provided by hot forging When supplying products, the number of processes such as surface cutting increases, resulting in a significant cost increase

[0009] In addition, the present applicant proposes the following improvements in order to reduce the thickness of the main shaft support plate to achieve weight reduction while suppressing the occurrence of thermal strain associated with welding to solve the above problems (for example, refer to Japanese Patent Application No. 2002-199449 ), that is, the plate is fixed by fitting and welding the curved flange formed on the outer four corners of the main body of the main shaft support plate to the outer periphery of the rear end of the trailing arm. However, the rear half of the trailing arm is In the case of a pipe structure extending substantially linearly, the open end surface of the trailing arm is a cut surface obliquely intersecting with respect to the axis of the arm. Therefore, in the above-mentioned improvement, the curved flange cannot be aligned with the rear end of the trailing arm. Peripheral mosaicism, difficult to apply

In addition, in order to install the main shaft, etc., it is necessary to accommodate the four threaded hole portions dispersedly arranged in front, rear and up and down four positions of the main shaft axis with respect to the main shaft axis, all of which are accommodated inside the opening end surface of the rear end of the arm, which makes the threaded holes The choice degree of freedom of the arrangement position of the part is narrow

Images