| 摘要 |
PROBLEM TO BE SOLVED: To easily control resistance of a throttle of an auto tensioner and to prevent clogging of the throttle. SOLUTION: In this auto tensioner 4 wherein a piston 12 of an end portion of a rod 11 is slidably inserted into a sleeve 9 fixed in the cylinder 10, a first check valve 19 is mounted in a first passage 18 communicating a pressure chamber 14 and a reservoir chamber 15 to permit only the flow to a pressure chamber 14 side, a second check valve 21 is mounted in a second passage 20 communicating the pressure chamber 14 and the reservoir chamber 15 to permit only the flow to a reservoir chamber 15 side, the throttle is mounted in the second passage 20, and a return spring 17 is mounted to energize the rod 11 and the cylinder 10, a step portion 24 for increasing a diameter at the pressure chamber 14 side is formed in the second passage 20, a spiral groove 25 is formed on the step portion 24, a column member 26 is press fitted to the second passage 20 in a state of being brought into contact with the step portion 24 at its end face 26a, and the throttle is composed of a spiral passage 27 between an inner face of the spiral groove 25 and the end face of the column member 26. COPYRIGHT: (C)2007,JPO&INPIT
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