Abstract: One end of a pivotal spindle for a suspension arm and one end of a torsion bar as a suspension spring are commonly joined to a serrated central part of a torque arm whose one end is bolted to a contacting wall part of the suspension arm and whose other end is fastened to a spaced wall part of the suspension arm by applying a nut on a bolting part formed on an end face of a poppet-like pin member projecting from the spaced wall part.

Abstract: A sleeve joined to a torsion bar passes through a through hole in a side wall plate fixed to a vehicle body. The sleeve comprises two projections. The shape and dimensions of the through hole are such that one of the projections can pass through the through hole at a predetermined rotation position. After this projection has passed through the through hole, the sleeve is rotated to a predetermined fixed angle. As the displacement of the sleeve in an axial direction is limited by the two projections the position of the sleeve in an axial direction is always constant.