Patent ID: 7128327

Claim:
A torsion beam type suspension device comprising: a pair of trailing arms spaced from each other axially of an axle, and connected to a car body at front ends, and rotatably supporting wheels at rear ends of said trailing arms through brackets; and a torsion beam extending axially of the axle and interconnecting the pair of trailing arms at both ends, wherein the rear ends of the pair of trailing arms are connected to the brackets through rubber cushions in a rocking manner, wherein the rubber cushions are interposed between an outer cylinder and an inner cylinder concentric with each other to constitute vibration isolating bushes, and wherein a pair of protruded parts are protruded from front and rear parts of the brackets in an inward direction of the axle, two cylindrical opening parts continuously arranged axially of the axle are respectively formed in the pair of protruded parts in a longitudinal direction, the vibration isolating bushes are press-fitted in and fixed to the cylindrical opening parts, two cylindrical protruded parts extending backward of the trailing arms are penetrated through the inner cylinders of front and rear vibration isolating bushes arranged in the longitudinal direction, and the rigidity of the front vibration isolating bush is set to be lower than the rigidity of the rear vibration isolating bush.