| 摘要 |
A chain tensioner is provided of which the damper force is less likely to decrease due to air mixed therein even if the tensioner is structured such that any angular portion of the cylinder could be located at the highest level when the tensioner is mounted in position. The chain tensioner includes cylinder 9, a plunger 10 slidably inserted in the cylinder 9, and a sleeve 16 having two open ends and coaxially mounted in the cylinder 9. The plunger 10 is axially slidably fitted around the outer periphery of the sleeve 16. An oil supply passage 18 is formed in the cylinder 9 through which hydraulic oil is introduced from outside the cylinder 9 into the cylinder 9. The end of the sleeve 16 near the closed end of the cylinder 9 is connected to the oil outlet of the oil supply passage 18. A check valve 20 is provided at the end of the sleeve 16 near the open end of the cylinder 9. A pressure chamber 23 is defined in the plunger 10 into which hydraulic oil flows through the check valve 20. A leakage gap 24 is defined between sliding surfaces of the plunger 10 and the sleeve 16.
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