| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact chain tensioner having a relief valve returning an oil inside a pressure chamber to an engine room. SOLUTION: The chain tensioner has a flange portion 13 formed in a periphery of housing 11. A pressure chamber 15 is formed by inserting a plunger 14 for pushing the chain. The oil is accumulated inside the pressure chamber 15. A return spring 16 biasing the plunger 14 toward a direction of increasing the volume of the pressure chamber 15 is arranged. An oil supply passage 17 communicating the pressure chamber 15 to exterior is formed in the housing 11. A check valve 19 is arranged in the oil supply passage 17. A screw rod 27 having a male screw 28 formed in the outer periphery to be engaged with a female screw 26 formed in an inner periphery of pressure chamber side of the plunger 14 is incorporated inside the pressure chamber 15. The tensioner provided with a spring 41 biasing the screw rod 27 in a direction of separating the screw rod 27 from the plunger 14 is arranged. A relief passage 32 communicating the pressure chamber 15 to exterior is formed. The relief passage 32 has a relief valve 33 to be opened when a pressure inside the pressure chamber 15 exceeds a predetermined pressure. COPYRIGHT: (C)2008,JPO&INPIT
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