| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine valve system drive mechanism for suppressing the fluttering of a cam chain at a winding portion on a driving sprocket, comprising a driven sprocket provided on a cam shaft rotatably borne on a cylinder head, the driving sprocket to be associated with the rotation of a crank shaft, an endless cam chain wound on the driving sprocket and the driven sprocket, and a chain guide member put in slide contact with the outer periphery of the cam chain. SOLUTION: An end 204 of the chain guide member 80A on the side of the driving sprocket 61A is formed to outwardly cover at least part of a portion of the outer periphery of the driving sprocket 61A, where the cam chain 62A is wound. COPYRIGHT: (C)2006,JPO&NCIPI
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