摘要 |
PROBLEM TO BE SOLVED: To provide an automatic tensioner employing a saw-tooth screw which prevents rotational force and rotational moment from acting thereon even if the rotational force and the rotational moment are loaded from an abutted part with a swingable chain guide so as to provide stable operation. SOLUTION: A saw-tooth male screw 28 of a rod member 17 is threadedly engaged with a saw-tooth female screw 16 of a nut member 15 incorporated in a cylinder chamber 13 of a housing 11. The rod member 17 is divided into an adjust screw 17b and a push rod 17a provided with the outward projecting property by a return spring 18. Even if the rotational force and rotational moment are loaded on the push rod 17a from a chain guide 6, the rotational force and rotational moment are prevented from being transmitted to the adjust screw 17b. COPYRIGHT: (C)2007,JPO&INPIT
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