Patent ID: 6866129

Claim:
A lockup device in a fluid-type torque transmission device comprising: a clutch member being an annular plate and having a friction coupling part being configured to be pressed against a friction surface of a front cover of the fluid-type torque transmission device; a piston being arranged between said front cover and a turbine of the fluid-type torque transmission device, said piston being configured to press said friction coupling part against said friction surface; a plurality of elastic members being arranged in a rotational direction, an outside radius of said clutch member being larger than a mounting radius of said elastic members; a drive member having an abutting part being configured to abut against rotationally-facing ends of said elastic members to transmit torque, and a plurality of mating parts being positioned farther outward in a radial direction than said abutting part, said plurality of mating parts extending radially outward and being configured to mate with said clutch member to prevent relative rotation between said drive member and said clutch member, said drive member having an annular part, said abutting part being formed on an inner circumferential section of said annular part, said abutting part being configured to extend in an axial direction; and a driven member being fixed to said turbine, said driven member being configured to receive torque from said elastic members.