| 摘要 |
PROBLEM TO BE SOLVED: To reduce air of a servo chamber by the movement of a control piston.SOLUTION: When issuing an air reduction command, a booster linear valve 160 is switched to an opening state, and a decompression linear valve 162 is switched to a closed state, and fluid pressure of a control pressure chamber 122 is increased, and the control piston 114 is advanced. A servo chamber 124 is cut off from a reservoir 52, and is communicated with a high pressure chamber 116, so that servo hydraulic pressure is increased. Afterwards, the decompression linear valve 162 is switched to an opening state. The control piston 114 retreats, and the servo chamber 124 is communicated with the reservoir 52. The air of the servo chamber 124 flows out to the reservoir 52 together with a working fluid. Thus, the air of an air reduction object part 222 can be reduced. |
