| 摘要 |
PROBLEM TO BE SOLVED: To realize a constitutional, simplification, a reduction of the number of part items and to enhance an assembling property and a pump performance by engaging a pump rod of a pump for feeding an oil of an oil tank to a cylinder to partition a pump chamber and disposing check valves on a suction passage and a discharge passage, respectively. SOLUTION: For example, at the time of an extension of a piston rod 13, an oil in an upper oil chamber 42A of a cylinder 12 is pressurized and the pressure oil is moved to a lower oil chamber 42b through an extension side valve 44A of a piston 41 to generate an extension side damping force. An oil having a volume being the same as a volume of the piston rod 13 drawing/ entering from the cylinder 12 is fed from a reservoir chamber to a lower oil chamber 42B through an extension side valve 29A of a bottom piece 23. At this time, a pump chamber 62 is formed from a hollow portion 61 of the piston rod 13 and a pump rod 22 engaged with the hollow portion 61. A discharge check valve 67 of the pump chamber 62 is disposed on an outer periphery of the piston rod 13. Thereby, other parts such as a pump tube, etc., are not required to accomplish a simple constitution. |
