| 摘要 |
PROBLEM TO BE SOLVED: To suppress the thermal deterioration of a friction member owing to the friction heat transmission, in a friction mechanism used in a clutch disk having the negative and the positive two stage hysteresis torque property. SOLUTION: A friction mechanism 8 is provided with the first bush 14, a friction washer 15, the second bush 18, and a cone spring 17. The first bush 14 is provided between a hub 2b and a clutch plate 3. The friction washer 15 is provided between a subplate 5 and the clutch plate 3. The friction coefficient of the friction washer 15 is set larger than the friction coefficient of the first bush 14. The second bush 18 is provided between the friction washer 15 and the first bush 14, and fixed to the friction washer 15. Between the first bush 14 and the second bush 15, a clearance for heat insulation is maintained.
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