| 摘要 |
PROBLEM TO BE SOLVED: To provide a chain tensioner used for the camshaft driving chain system of a vehicle engine, particularly a motorcycle engine and capable of suppressing the vibration of a chain by properly holding the tension of the chain. SOLUTION: In this chain tensioner 10, a plunger 12 is slidably inserted into a cylinder chamber 11a in a housing 11, the pressure chamber 11b of a plunger 12 on the bottom side is allowed to communicate with a hydraulic damper chamber 12b in a hollow chamber 12a in the plunger 12, and a return spring 13 is installed in a space therebetween. A check valve 14 preventing the reverse flow of a hydraulic oil is installed at the closing end of the cylinder chamber 11a, and a relief valve 20 is installed in the advancing side of the plunger 12 midway to an oil discharge passage communicating with the hydraulic pressure damper chamber 12b. The set pressure range of the relief valve 20 and a set leak clearance 12s between the inner diameter of the cylinder chamber 11a and the outer diameter of the plunger are set in prescribed ranges matching the wide ranges of variation in pressure and temperature. COPYRIGHT: (C)2006,JPO&NCIPI
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