Patent ID: 9573436
Date: 2017-02-21
CPC Classifications: B60B,B60G

Claim:
1. A torsion beam which is used in a suspension system of an automobile which is provided with a pair of arm members which extend in a front-rear direction of said automobile and are designed to be connected at first end parts to a chassis of the automobile so as to be able to swing about pivot shafts in a top-bottom direction and to have wheels attached rotably at second end parts at opposite sides to the end parts which are connected to the chassis of the automobile, wherein said torsion beam has a recess which extends in the longitudinal direction whereby that torsion beam has first and second leg parts in a plane vertical to said longitudinal direction and exhibits a substantially V-shaped or substantially U-shaped cross-sectional shape, said torsion beam is provided with connection parts which are provided at the two ends of that torsion beam and are connected to said arm members, a fixed shape part which is provided at a center part in the longitudinal direction of that torsion beam, and asymmetric shape parts which are provided between that fixed shape part and said connection parts, at said fixed shape part, said recess has a constant depth and said first and second leg parts have generally the same thicknesses or width dimensions, and at said asymmetric shape parts, the depth of said recess becomes gradually deeper from said connection parts toward said fixed shape part and said first leg part has a larger width dimension than the width dimension of said second leg part.