HYDRAULIC ACTUATOR DRIVING CIRCUIT OF CONSTRUCTION MACHINE

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PROBLEM TO BE SOLVED : To provide a hydraulic actuator driving circuit for driving a plurality of control valves by one hydraulic pump, wherein a working oil supply flow rate is not insufficient even when a required flow rate of each control valve varies. SOLUTION : The hydraulic actuator driving circuit of a construction machine includes : a variable displacement hydraulic pump 1 supplying pressure oil to two hydraulic actuator groups; a regulator 13; a diverter valve 2 to which the pressure oil discharged from the hydraulic pump is input and which diverts and outputs it in accordance with a specific flow rare ratio; and two control valve units 5, 6 controlling the directions and the flow rates of the pressure oil in two-system oil passages 2a, 2b diverted from the diverter valve and supplying it to the respective hydraulic actuator groups. The hydraulic actuator driving circuit further includes : a detection oil passage for taking a required flow rate of each control valve unit; a selection means for selecting a high value of the required flow rate taken by the detection oil passage; and a regulator for controlling the discharge flow rate of the hydraulic pump so that the maximum required flow rate selected by the selection means is satisfied. COPYRIGHT : (C)2012, JPO&INPIT