Patent ID: 7284765

Claim:
A torsion beam suspension comprising: a pair of left and right trailing arms ( 1 ) which are pivotally supported at their front end portions on a vehicle body, and which support wheels ( 7 ) at their rear end portions; a torsion beam ( 2 ) which has left and right opposite end portions connected to the trailing arms ( 1 ) by welds (W 1 ), and which causes torsion when the trailing arms ( 1 ) swing in opposite phases; and gussets ( 3 ) which are U-shaped in section and substantially triangular in plane view, and which are connected by welds (W 2 , W 3 ) to inner side surfaces of connecting portions between the trailing arms ( 1 ) and the torsion beam ( 2 ), characterized in that the torsion beam ( 2 ) is formed into a U-shape in section with an open surface facing forward, and seat surfaces ( 9 ) are formed by crushing at left and right opposite end portions of a rear wall ( 2 a ) of the torsion beam ( 2 ), the seat surfaces ( 9 ) being offset forward from a general outer surface of the rear wall ( 2 a ) by an amount (e) larger than a plate thickness (t) of the gussets ( 3 ); and that each gusset ( 3 ) includes an inner end edge portion ( 3 d ) superposed on an intermediate portion in a lateral direction of the seat surface ( 9 ), and upper and lower front edge portions ( 3 c , 3 c ) connected by a weld (W 3 ) to an outer surface of the torsion beam ( 2 ) at upper and lower portions of the seat surface ( 9 ).