Patent ID: 6938744

Claim:
A fluid-type torque transmission device comprising: a front cover having a friction surface; an impeller being fixed to said front cover and forming a fluid chamber to be filled with an operating fluid; a turbine being arranged within said fluid chamber to face axially said impeller, and a lockup device comprising, a plurality of springs being arranged along a rotational direction between said front cover and said turbine, said plurality of springs being configured to deform elastically in the rotational direction, said plurality of springs being movable in the rotational direction, a first rotary member being disposed on a turbine side of said plurality of springs, said first rotary member being configured to support said plurality of springs, said first rotary member having a first axial support part and supporting a turbine side of said springs, and a first radially outside support part being configured to support a radially outward facing side of said springs, a second rotary member being fixed to said first rotary member and said turbine and having a plurality of second rotational direction support parts being disposed rotationally between said springs and support rotationally facing ends of said springs, a third rotary member being provided to be rotatable relative to said first and second rotary members, said third rotary member having a friction coupling part axially facing said friction surface and a plurality of third rotational direction support parts being configured to support said rotationally facing ends of said plurality of springs, and a piston being disposed on a turbine side of said friction coupling part, said piston being configured to couple non-rotatably and axially movable to said front cover, said piston being configured to press said friction coupling part against said friction surface, said first and second rotary members being configured to support a radially inward facing side of said plurality of springs and a front cover side of said springs, and said first axial support part having a plurality or positioning holes being formed in rotational positions corresponding to said second rotational direction support parts and having rotational direction lengths being larger than rotational direction widths of said second rotational direction support parts.