| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize a hydraulic control system with a small confluent circuit. SOLUTION: This hydraulic control system includes a plurality of hydraulic driving systems 10, 20 for performing flow control and pressure control to variable displacement pumps 12, 22 for hydraulically driving load 14, 24, the confluent circuit 50 provided extending between the pump discharge lines 13, 23 of both systems, and a switching control means 44 for performing switching between confluence and non-confluence and also switching between the subsidiary state and the independent state concerning about the control of the hydraulic driving systems 10, 20. The confluent circuit 50 is provided with seat valves 52, 62 interposed in confluent lines 51, 61 communicating the pump discharge lines 13, 23 with each other and pilot circuits 53+54, 63+64 for supplying pilot pressure to the above valves to selectively switch its operating state to the shut-off state or the check valve state. The direction switching and non-return functions are made intensive in the seat valves and the direction switching valve is deviated from the confluence line.</p> |
