Importance

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Abstract

An improved vehicle suspension system of the double wishbone type including an A-type suspension lower arm which has different strength at different portions thereof suitable for sharing the loads imposed thereon so as to reduce the overall weight thereof. The suspension lower arm, which has a ball-joint mounting portion, is pivotally attached at its front and rear mounting portions to the body of a vehicle for vertical swinging movement and is comprised of a first arm member and a second arm member respectively formed by bending a plate material. The first arm member extends rearwardly from the front mounting portion and the second arm member extends forwardly from the rear mounting portion so that they are superimposed on and secured as by welding to each other at a location near the ball-joint mounting portion. The first and second arm members each have an upper wall and a pair of opposite side walls. The upper wall of the first arm member has a stepped extension which is secured to the lower edges of the opposite side walls of the second arm member so as to form a closed cross-sectional structure. A torsion bar is fixedly mounted on the suspension lower arm at a location upwardly offset from the axis of swinging motion of the suspension lower arm so that ample clearance is formed between the torsion bar and the ground surface, while avoiding interference of the torsion bar with a cross member of a closed cross-sectional disposed rearwardly of the suspension lower arm.

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First Claim