| 摘要 |
PURPOSE: To prevent the pressure vibration of a pressurized fluid by connecting a flow limit means to limit the pump capacity to a fluid pressure piping through two check valves of opposite polarity in a hydraulic control system in which the pressurized fluid by a pump is discharged to the fluid pressure piping through a controlled oil controlling mechanism. CONSTITUTION: In a pressure compensation type variable displacement hydraulic pump control system 10, the pressurized fluid by a variable displacement type pump 12 provided with a swash plate 14 is discharged to a fluid pressure conduit 20 through a control valve system (controlled oil control means) 18. The swash plate 14 controls the angle of tiltation by a piston 22 subjected to the spring force of a coil spring 24 and the fluid pressure in the conduit 20, and the swash plate 14 is urged by a yoke positioning piston 26 arranged on the side opposite to the piston 22. The piston 26 is controlled by the fluid pressure through a load-sensing and pressure compensation spool valve 28, and the spool valve 28 is connected to the conduit 20 through check valves 30, 32 of opposite polarity having a flow resistance to be changed in proportion to the magnitude of the fluid flow. |
