Damper disk having hydraulic shock absorbers

Claim 1

A damper disc comprising: a spline hub; a radial flange formed at the hub; a sealed case having two halves covering the flange and having a radially outer portion to which a torque is transmitted; torsion springs disposed in openings in the flange and axially faced hollws in the case for connecting the flange and the case together; and a piston cylinder mechanism disposed concentrically within the case and having a piston operable to move in accordance with relative torsion between the case and the flange, the case and a cylinder of the piston cylinder mechanism being filled with operating oil, and the cylinder being provided with only a narrow space through which the oil can be discharged and the cylinder being used exclusively as a hydraulic damper and having outer cylindrical walls separating said cylinder from said torsion springs, and said cylinder having an annular shape extending along a disc rotating direction and being arranged radially inside the torsion springs and between the case and the flange, an annular space in the cylinder is divided by partitions into several partially annular chambers in which the pistons are disposed respectively, the cylinder and partitions are fixed to one of the case and the flange, and the pistons in the cylinder are fixed to the other of the case and the flange.