car lower arm

Abstract

In the lower swing arm of the automobile disclosed by the present invention, the top edge of the convex cutaway piece is welded to the outer cylindrical surface of the bushing, the two outer sides of the bottom of the cutaway corner are respectively welded to the two sides of the small bushing hole assembly, and the convex cutaway piece The welding seam of the top edge and the two welding seams of the outer edge do not intersect due to missing corners; the section of the small bushing hole body assembly is used to match the outer cylindrical surface of the bushing in the circumferential direction, and the section of the welding end is a U-shaped flanging structure. The welding seam between the two sides of the U-shaped flanging structure and the bushing does not intersect with the welding seam on the top edge of the convex notch piece; the existence of the convex notch avoids the welding form where the three welds at the bushing weld meet. , to avoid the problem that if three welds intersect, the mechanical properties of the material in the weld toe area will decrease, and at the same time, the cross welds will easily produce overburning in the overlapping area, which will greatly reduce the strength and durability of the weld.

Description

technical field [0001] The invention belongs to automobile suspension plate parts, in particular to automobile lower swing arms. Background technique [0002] The front suspension swing arm (also known as the lower swing arm of the car) is a component that connects the steering knuckle and the sub-frame (or body), and mainly transmits the longitudinal and lateral loads excited by the road to the sub-frame (or body). key components of the system. In order to ensure that the swing arm has sufficient rigidity and strength, the swing arm usually adopts the buckle welding structure of the upper and lower plates. The swing arm assembly generally consists of the swing arm body 1a, the swing arm lower plate 2a, the ball stud assembly 3a, the small Bushing hole assembly 4a, large bushing hole assembly 5a and bolt and nut assembly 6a, see figure 1 shown. The advantages of this structure are high rigidity and high strength, but the disadvantages are complex molding process, high ass...

AI Technical Summary

Problems solved by technology

Its advantage is that it is light in weight, and at the same time, the process of molding and assembly is relatively simple. However, since the installation hole 7b is usually reserved in the middle of the swing arm to facilitate the disassembly and assembly of the sub-frame, etc., at the same time, in order to meet the clearance requirements with the sub-frame, the middle installation hole is made 8b has a small cross-sectional size and low structural strength. It is usually only suitable for small cars or light vehicles with light vehicle weight. The versatility deviates and has certain limitations.

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