| 摘要 |
<p>A check valve unit (140) in a hydraulic tensioner(100) comprises a check ball (141) which controls the flow of the oil to and from a high pressure oil chamber (R) formed by a plunger (120) and the plunger-receiving hole (111) of the tensioner housing (110), a ball guide (142) in which the check ball (141) moves, a retainer (143) which seals the check ball (141) in the ball guide (142), and a ball seat (144) which blocks reverse flow of oil by seating the check ball (141). Grooves (142d and 144b), which ventilate air from the high pressure oil chamber (R) to an oil supply passage (112), are formed on an outer circumferential surface of the ball guide (142) and a bottom surface of the ball seat (144).</p> |
