| 摘要 |
PURPOSE:To obtain large cushioning action, by recirculating oil in a chamber in the high pressure side of a cylinder directly to a tank through a selector valve at operation of a cushion device. CONSTITUTION:If a piston 2 is displaced rightward to reach a position in the vicinity of a stroke end, a spool 22 is displaced rightward against urging force of a spring 25B and selected. As a result, an oil chamber C is communicated to an oil chamber D through an oil passage 21A to communicate a pipe 26 to 27. When a cushion ring 31 is fitted in a cushion chamber 29, large cushioning action can be obtained with damping action caused by flow resistance of fluid flowing in an annular gap formed between the ring 31 and the chamber 29. |
