| 摘要 |
In the check valve of a hydraulic tensioner, the cap wall of a check ball retainer has a stroke restricting surface that restricts movement of the check ball from a valve seat. The stroke restricting surface is a concave surface having a curved cross-sectional shape. The center of curvature of the curve is located on the side of the stroke restricting surface on which the ball seating surface of the check valve is located, and is either radially inward from the a point of abutment between the check ball and the stroke restricting surface or substantially on the center line of the valve seat.
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