| 摘要 |
PROBLEM TO BE SOLVED: To provide a timing chain drive unit alleviating effects of tension fluctuation to reduce the size and weight of a chain, preventing noise caused by vibration of the chain and improving quietness of a system. SOLUTION: The timing chain drive unit is provided with a driving sprocket, a driven sprocket and the chain hung between the both sprockets and transmitting rotating force. The sprocket teeth 171 of the sprocket 170 are set at pitches of irregular intervals over the perimeter of the sprocket 170. COPYRIGHT: (C)2009,JPO&INPIT
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