Importance

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Abstract

In a torsion beam suspension including: a pair of left and right trailing arms 1; a torsion beam 2 providing connection between the trailing arms 1; and gussets 3 which are U-shaped in section and substantially triangular in plane view and which are welded to inner side surfaces of connecting portions between the trailing arms 1 and the torsion beam 2, seat surfaces 9 are formed by crushing at left and right opposite end portions of a rear wall 2a of the torsion beam 2, the seat surfaces 9 being offset forward from a general outer surface of the rear wall 2a by an amount e larger than a plate thickness t of the gussets 3, and each gusset 3 includes an inner end edge portion 3d superposed on an intermediate portion in a lateral direction of the seat surface 9, and upper and lower front edge portions 3c, 3c connected by a weld W3 to upper and lower portions of an outer surface of the torsion beam 2. Thus, in the torsion beam, an abrupt increase in torsional rigidity is suppressed in the gusset inner end portion without reducing strength of the torsion beam to alleviate stress concentration, thereby providing a torsion beam suspension having a high durability.

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First Claim