| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic circuit for working machine that can secure the regenerated flow in the case that the load of a particular actuator is small at the time of combined control so that a pressurized oil is supplied from two hydraulic pumps to the particular actuator for regeneration. <P>SOLUTION: Beside the pressurized oil discharged from the first hydraulic pump 1 is supplied to an arm cylinder 4 when a direction changeover valve 14 for an arm is driven, a direction changeover valve 13 for confluence is provided so that the pressurized oil discharged from the second hydraulic pump 2 is supplied and the discharge pressure of the hydraulic pump 1, 2 is detected by pressure detectors 101, 102. Accordingly, the supply of regenerated flow is possible to the arm cylinder 4 at the time of the combined actions between the arm cylinder 4 and other actuators 3, 4 when the load pressure of the arm cylinder 4 is low, by controlling the opening area of a reclaim changeover valve 6 according to the pressure on the low pressure side out of the detected pressure by the pressure detectors 101, 102. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
