| 摘要 |
PURPOSE:To prevent charged air from mixing with hydraulic oil by forming a piston rod of a hollow shape, and providing a large diametral oil reservoir chamber sealingly charged with air on its upper part, and forming a circulation system for the hydraulic oil of an oil chamber in a sheet pipe and said oil reservoir chamber to provide a damping force generating means. CONSTITUTION:A hollow piston rod 4 is slidably inserted in a sheet pipe 3, and the inside of said pipe 3 is partitioned by a piston 5 into oil chambers A, B. An oil reservoir chamber E communicating with a lower oil passage 6 through valve devices 7, 8 functioning as a damping force generating means for pressure is provided. The sliding motion of said piston 5 causes hydraulic oil in the oil chamber B to flow into the oil chamber A, and said oil in the piston rod 4 to flow into the oil reservoir chamber E, and charged air in said chamber E is therefore compressed. Thus the air in the oil reservoir chamber can be reduced in its mixing with the hydraulic oil. |
