Daikin Clutch Corporation

Hideyuki Imanaka

Koji Kitayama

A damper disc assembly comprises a radially flanged hub, connectable to an output shaft, flanked by lateral subplates, and surrounded by an input rotation member; a first torsional vibration damping mechanism; a second torsional vibration damping mechanism; and an action limiting member. The first torsional vibration damping mechanism elastically connects the hub and the lateral subplates and includes a first, low-rigidity elastic member and a first hysteric damping mechanism developing lesser hysteresis. The second torsional vibration damping mechanism, also elastically connecting the lateral subplates and the input rotation member, includes second and third elastic members more rigid than the first elastic member, and a second hysteretic damping mechanism developing greater hysteresis. The action limiter restricts the action or the elastic members such that only one of the second and third of these operates in the effective range of the second torsional vibration damping mechanism, thereby providing torsional vibration damping under operational characteristics in which the assembly is in a medium-rigidity phase meanwhile effecting the greater hysteresis.

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Neyagawa, Japan

Hideyuki Imanaka