| 摘要 |
PROBLEM TO BE SOLVED: To rapidly carry out a diffusion of a friction heat and to inhibit a deterioration of a member without impairing a light weight of a fly wheel by constituting a heat-releasing portion by forming a back surface side of the fly wheel to an uneven surface having an appropriate shape. SOLUTION: A clutch disc 3 is urged and press-fitted to a fly wheel 2 by a diaphragm 5 and a pressure plate 6 supported to a clutch cover 4 at a usual time and transmits a rotation of the fly wheel mounted to a crankshaft 1 to a drive shaft 7. In this case, a convex/concave surface of an appropriate shape is formed on a back surface side of the fly wheel 2, i.e., an opposite surface of a contact surface with the clutch disc 3 to form a heat-releasing portion 9. A friction heat of a high temperature transmitted from a front side of the fly wheel 2 contacting with the clutch disc 3 is rapidly diffused to the outside of a clutch by utilizing a heat-releasing action of the heat-releasing portion 9 with an increased surface area. Thereby, a thin wall and a light weight of the fly wheel 2 are promoted.
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