Patent ID: 7108112

Claim:
A damper mechanism for a lockup device which serves to mechanically transmit torque in a hydraulic torque transmission device, comprising: a first rotary member having a plurality of first windows aligned in a rotational direction, said first rotary member being axially movably and rotationally fixedly connected to a piston; a second rotary member having a plurality of second windows overlapping with said first windows, and rotatable relative to said first rotary member; and a plurality of elastic members being arranged in said overlapping first and second windows, and compressed in said rotational direction by relative rotation between said first and second rotary members, a maximum torsion angle θ m being defined between said first and second rotary members rotated relative to each other to compress said elastic members to a maximum extent, and each of said first and second windows having a radially outer periphery longer than a radially inner periphery, and an angle θ formed by each radial end of said first and second windows with respect to a straight line extending through a center of said damper mechanism and a circumferential center of said first or second window being in a range between 0.20 and 0.40 times as large as said maximum torsion angle θ m.