| 摘要 |
PURPOSE:To reduce the cost and also to improve the durability of the seal by inserting a seal ring between the outer surface of the plunger and the inner surface of the plunger body allowing the seal ring to slide and thus by forming a space to absorb the hydraulic fluid. CONSTITUTION:A plunger 31 capable of sliding motion is fitted in a plunger body 35, while a nonreturn valve 19 partitions a high-pressure chamber 7 and a reservoir chamber 17. The reservoir chamber 17 is sealed by a seal ring 38 which is inserted between the outer surface of the plunger 31 and the inner surface of the plunger body 35 so that the seal ring is allowed of sliding motion. Since a diagram fixed between the outer surface of the plunger and the inner surface of the plunger body is not used as a seal, the fitting of the seal can be done easily and the cost is reduced. Moreover, as a thick seal can be used, durability is improved. |
