| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid pressure circuit capable of improving initial motion speed in contraction of a fluid pressure cylinder, and capable of ensuring a necessary pump flow rate even when working fluid is accumulated in an accumulator with a simple structure, and to provide a work machine.SOLUTION: When pressure oil from the head side of a boom cylinder 7c1 is accumulated in a first accumulator 46 through a control valve 61 by an accumulation circuit A, working fluid from the head side of a boom cylinder 7c2 is regenerated to the boom cylinders 7c1, 7c2 through a main control valve 62 of a regeneration circuit B. Working fluid subjected to pressurization supply from a main pump 12 is supplied to the rod side of the boom cylinder 7c1 by a control valve 26 for boom in a state where the control valve 61 and a tank 21 communicate with each other by a bleed-off valve 63 of a bleed-off circuit C for returning working fluid from the control valve 61 to the tank 21 in initial motion of the control valve 61.SELECTED DRAWING: Figure 1 |
