| 摘要 |
PROBLEM TO BE SOLVED: To reduce abnormal sound vibration at idling by combining a friction generating means with a friction restraining means and absorbing torsional micro-vibration. SOLUTION: A clutch disc assembly has a hub 3, an input rotating body 2, a first spring 7, a second spring 8, a second friction mechanism 13 and a third friction mechanism 14. The first spring 7 elastically connecting the hub 3 to the input rotating body 2 in the rotational direction and is compressed in a first step range where the torsional angle of both the members 3, 2 is up to a first torsional angle. The second spring 8 elastically connecting the body 2 to the hub 3 in the rotational direction and is compressed in a second stage region, to thereby providing a higher rigidity than a rigidity in the first stage region. The second friction mechanism 13 is able to generate a first hysteresis torque in the first stage and second stage regions. The third friction mechanism 14 is able to generate a second hysteresis torque while parallely acts with the second friction mechanism 13 in only the second stage region. GapsθAC1,θAC2 serving as hysteresis torque restraining mechanisms do not make the second and third mechanisms 13, 14 act on torsional vibration of not more than a specified torque.
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