Patent ID: 8205731

Claim:
A lockup device for a fluid-type torque transmission device used in the fluid-type torque transmission device and disposed to transmit torque between a front cover and a turbine, comprising: a piston being provided movably in an axial direction and rotatably with respect to the front cover, the piston being configured to be connected to the front cover in order to transmit the torque from the front cover to the piston; a first plate being fixed to the piston in order to transmit the torque from the piston to the first plate; an intermediate plate being provided to be rotatable with respect to the piston within a specific angular range; a first elastic member being supported by the first plate to be elastically deformable in a rotation direction, the first elastic member being configured to transmit the torque from the first plate to the first elastic member and from the first elastic member to the intermediate plate; a second elastic member being disposed radially outside the first elastic member, the second elastic member being arranged and configured to act in series with the first elastic member via the intermediate plate, the second elastic member being supported by the intermediate plate to be elastically deformable in the rotation direction, the second elastic member being configured to transmit the torque from the intermediate plate to the second elastic member; a driven member having a prong being configured to contact an end of the second elastic member, and being fixed to the outer peripheral part of the turbine, the driven member being configured to transmit the torque from the second elastic member to the driven member; a first fixing member disposed radially outside the first elastic member, the first fixing member disposed to fix the outer peripheral part of the first plate to the piston; and a second plate disposed in the axial direction between the piston and the intermediate plate, and the second plate is fixed to the piston, the first elastic member being supported by the first and second plates to be elastically deformable in the rotation direction.