| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of changing an operation speed in a telescopic motion of a cylinder device according to a situation with a simple constitution and high efficiency.SOLUTION: A pump device includes a first pump 101, a first flow channel 111 connecting a first chamber Y1 and a first discharge portion 101a, a second flow channel 112 connecting a second chamber Y2 and a second discharge portion 101b, a second pump 102, a third flow channel 113 connecting the first chamber Y1 and a third discharge portion 102a, a forth flow channel 114 connecting the second chamber Y2 and a forth discharge portion 102b, a first check valve 131 disturbing flow from the first flow channel 111 to the third discharge portion 102a, a second check valve 132 disturbing flow from the second flow channel 112 to the forth discharge portion 102b, a fifth flow channel opening/closing valve 141 disposed in the fifth flow channel 115 and opening the fifth flow channel 115 by receiving a pressure of the second flow channel 112, and a sixth flow channel opening/closing valve 142 disposed in the sixth flow channel 116 and opening the sixth flow channel 116 by receiving a pressure of the first flow channel 111.SELECTED DRAWING: Figure 4 |
