| 摘要 |
PROBLEM TO BE SOLVED: To provide a chain tensioner in which the position of a plunger can be reliably fixed when an engine is stopped. SOLUTION: In the chain tensioner 1, the plunger 10 is slidably inserted in a cylinder 9. The plunger 10 has a cylindrical insertion end which is to be inserted in the cylinder 9 and has a female thread 16 formed in the inner periphery thereof. A screw rod 18 having on its outer periphery a male thread 17 engaging with the female thread 16 is provided in the cylinder 9. The male thread 17 and the female thread 16 have a sawtooth shape in which the flank angle α of a pressure flank 19 is greater than the flank angle β of a clearance flank 20. A return spring 21 mounted between the plunger 10 and the screw rod 18 urges the plunger 10 in the direction in which the plunger 10 projects from the cylinder 9, and the plunger 10 presses the chain 6. At least one of the pressure flank 19 of the male thread 17 and the pressure flank 19 of the female thread 16 is satin finished. COPYRIGHT: (C)2009,JPO&INPIT
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