| 摘要 |
PURPOSE:To suppress chain noise by installing viscoelastic bodies between a bearing for supporting a sprocket and a case and allowing the vibration generated on the sprocket to be absorbed by the viscoelastic body. CONSTITUTION:A sprocket 8 is supported by bearings 11 and 12, and viscoelastic body mechanisms 14 and 15 are arranged between bearings 11 and 12 and a case 13. The resonance frequency of a vibration system constituted of the viscoelastic mechanisms 14 and 15 and the sprocket 8 is sufficiently smaller than the frequency of the chain noise. Therefore, the vibration generated in the sprocket 8 is absorbed by the viscoelastic body, and the transmission to the case is reduced, and the noise can be suppressed.
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