Patent ID: 11965575
Assignee: EXEDY CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 5:
6. A power transmission device comprising:
an input-side rotor;
an output-side rotor provided to be rotatable relative to the input-side rotor;
a plurality of elastic members configured to elastically couple the input-side rotor and the output-side rotor in a rotational direction; and
a hysteresis torque generating mechanism configured to generate a hysteresis torque in relative rotation between the input-side rotor and the output-side rotor, wherein
the hysteresis torque generating mechanism includes
a friction member disposed axially between the input-side rotor and the output-side rotor, and
a pressing member configured to press a first lateral surface of the friction member onto a rotor lateral surface of either the input-side rotor or the output-side rotor, and

the friction member includes
an initial contact portion provided to axially protrude from the first lateral surface, the initial contact portion configured to slide in contact with the rotor lateral surface of either the input-side rotor or the output-side rotor, and
a main friction surface configured to slide in contact with the rotor lateral surface of either the input-side rotor or the output-side rotor after abrasion of the initial contact portion.