| 摘要 |
PROBLEM TO BE SOLVED: To absorb bending vibration of a crank shaft and reduce noise at the time of acceleration without degrading clutch changing performance by applying anisotropy to flexural rigidity in an intermediate part between a flywheel mounted part and its center part. SOLUTION: For a flexible plate 4, its inner periphery part 4b is fixed at the flange part 3a of a crank shaft 3, and a flywheel 5 is fixed at its outer periphery part 4c. A plurality of through-holes 8 are disposed at uneven intervals in the circumferential direction at the intermediate part 4d of the inner periphery part 4b and the outer periphery part 4c, and a drawing part 12 of elliptic shape is formed. Therefore, the flexible plate 4 reduces its flexural rigidity without reducing its translational rigidity by the through-holes 8 and the drawing part 12. If bending vibration is generated by rotational force from the crank shaft 3 of an engine, bending vibration is hardly transmitted to the flywheel 5 because the rigidity of the flexible plate 4 is low, thus it is possible to suppress excitation of a vehicle body and reduce noise at the time of acceleration. |
