| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce the noises caused by a fitting part of a cam chain guide without excessively increasing the pressing force of a cam chain tensioner. SOLUTION: A cam chain guide 10 slidingly guiding a cam chain in a valve system of a 4-cycle engine is made of a resin and a fitting hole 21 for a fitting bolt is provided in a fitting end 20 for a crankcase. Side face projecting parts 23 are projectingly provided from a general face circumferentially at same intervals in the fitting face 22 around the circumference of the fitting hole and annular relief recesses 25 are formed around the circumference of the respective side projecting parts 23. Inside projecting parts 24 are projectingly provided in the central direction in the circumferential direction at same intervals in the internal circumferential face of the fitting hole 21.
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