| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reliabile hydraulic autotensioner capable of reducing the wear of an annular sheet by suppressing the behavior of a check ball without damaging the function of a check ball type check valve since only a fluctuation in micropressure in a high pressure oil chamber occurring due to the microvibration movement of the hydraulic autotensioner is absorbed. SOLUTION: In the hydraulic autotensioner 1 having a check ball type check valve 23 to communicate with a high hydraulic chamber 20 and a low hydraulic chamber 21 only in one direction, a rubber plug 30 facing the high pressure oil chamber 20 and an air chamber 32 sealing air 31 by the rubber plug 30 are situated as a micropressure fluctuation absorbing member to absorb a micropressure fluctuation in the high pressure oil chamber 20 generated during the microamplitude vibration of the autotensioner 1 due to the vibration of a transmission member to an extent that, in some micro pressure fluctuation, a check ball 26 does not work. COPYRIGHT: (C)2004,JPO
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