| 摘要 |
<p>A pressure oil supplying device wherein, in order to distribute and supply pressure oil discharged from a hydraulic pump to a plurality of actuators without using any shuttle valves and to prevent the natural drop of the actuators in a transition state in which load pressures are changed over, a plurality of pressure compensator valves connected in parallel with a pump discharge conduit of the hydraulic pump and direction control valves each installed at each pressure compensator valve are provided so that pressure oil discharged from the hydraulic pump is supplied to the plurality of actuators, the pressure oil supplying device being characterized in that the pressure compensator valve is constituted by a check valve portion for opening and closing the pump discharging conduit and the inlet port of a direction control valve and a pressure reducing valve portion for reducing the pump discharging pressure, that the check valve portion is constructed such that it is moved so as to open the valve by the inlet pressure, while it is moved so as to close the valve by the outlet pressure, that the pressure reducing valve portion is constructed such that it is brought into abutment with the check valve portion by means of a spring and that a communication between the inlet side and the outlet side thereof is established by the pressure of one of the pressure chambers so as to be biassed in a direction away from the check valve portion, while the communication between the inlet side and the outlet side is cut off by the pressure of the other pressure chamber so as to be biassed in a direction of closing the check valve portion, and that a load pressure is supplied to the actuator for supplying pressure oil to the one of the pressure chambers so that the other pressure chambers of the respective valve blocks are caused to communicate with each other.</p> |
