DYNAMIC DAMPER DEVICE AND LOCK-UP DEVICE FOR FLUID TYPE POWER TRANSMISSION DEVICE

摘要

A dynamic damper disposed between a piston of a lock-up device and a turbine hub of a fluid type power transmission device includes a pair of plates into which a torque is inputted and that is allowed to be coupled to the turbine hub, a hub flange, an inertia member fixed to the hub flange, a torsion spring, and a hysteresis torque generating mechanism. The hub flange is disposed between the pair of plates while being rotatable relative to the pair of plates. The torsion spring elastically couples the pair of plates and the hub flange. The hysteresis torque generating mechanism is disposed on an inner peripheral side of the hub flange while being disposed between the pair of plates, and is configured to generate a variable hysteresis torque between both plates and the hub flange.

主权项

1. A dynamic damper device disposed between a piston of a lock-up device and a turbine hub of a fluid type power transmission device, comprising:
a pair of plates into which a torque is inputted from the piston, the pair of plates being configured to be coupled to the turbine hub; an annular hub flange disposed between the pair of plates while being rotatable relative to the pair of plates; an inertia member fixed to the hub flange; an elastic member elastically coupling the pair of plates and the hub flange in a rotational direction; and a hysteresis torque generating mechanism disposed on an inner peripheral side of the hub flange while being disposed between the pair of plates in an axial direction, the hysteresis torque generating mechanism being configured to generate a variable hysteresis torque between the pair of plates and the hub flange, wherein the hysteresis torque generating mechanism is configured to generate a first hysteresis torque in a low rotational speed range and generate a second hysteresis torque greater than the first hysteresis torque in middle to high rotational speed ranges.