Lock-up device for torque converter

摘要

A lock-up device basically includes a piston, a first plate, a second plate, a plurality of outer peripheral side torsion springs and a plurality of inner peripheral side torsion springs. The piston is configured to press a friction member that is fixed to a lateral surface of the piston onto a front cover or release pressing of the friction member. Further, the piston has a plurality of engaging portions formed by partially bending the piston towards the turbine. The second plate is coupled to the turbine. The outer peripheral side torsion springs are disposed between the piston and the first plate. The outer peripheral side torsion springs are configured to transmit torque from the piston to the first plate while the circumferential ends thereof are engaged with the engaging portions of the piston.

主权项

1. A lock-up device for a torque converter, the lock-up device being disposed between a front cover coupled to an engine-side member and a turbine of the torque converter, the lock-up device being configured to mechanically transmit torque from the front cover to the turbine, the lock-up device comprising:
a piston having a friction member on a front-cover-side lateral surface thereof, the piston being configured to be axially moved in order for the friction member to be pressed onto or separated away from the front cover, the piston having a plurality of first engaging portions formed by partially bending the piston towards the turbine; an output plate coupled to the turbine; and a first elastic member and a second elastic member disposed between the piston and the output plate, the first and second elastic members being configured to transmit torque from the piston towards the output plate, the piston being an annular plate member, and each of the plurality of first engaging portions of the piston having a predetermined length from an outer peripheral end portion of the piston towards an inner periphery of the piston., the friction member being an annular member attached to the outer peripheral end portion of the piston, the friction member having a plurality of cutouts in positions corresponding to the plurality of first engaging portions disposed in the outer peripheral end portion of the piston, and the first elastic member including circumferential ends being engaged with the plurality of first engaging portions of the piston.