| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of vibration in an axial direction of a crank system, to prevent the generation of tapping noises, and to reduce the generation of vibration noises. SOLUTION: In a fly wheel 1 mounted on a crank shaft protruded at the rear of an engine, the fly wheel is formed in a shape having a plurality of spokes 5, and a web-like plate part 16 being thinner than longitudinal thickness (t) of the spoke is formed at the bifurcate part of a root between the spokes. A given flex plate hit surface 14 can be formed without exerting an influence on vibration characteristics of the fly wheel 1, and fatigue damage of the flex plate can be prevented. It is preferable that the number of the spokes 5 is odd and the number of the spokes may be seven.
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