| 摘要 |
PURPOSE:To permit the driving performance of a car to be developed efficiently when the car ascends a slope by connecting a flow-rate control valve whose throttle amount is gradually increased as the operation pressure of load increases, to the discharge side of a pump. CONSTITUTION:A discharge conduit 1f of a pump 1 is connected to a flow-rate control valve 2 in which a piston 2d pressed by a spring 2i is arranged in slidable way, a plunger 2g pressed by a spring 2j is installed in slidable way in the axial direction and with the top end 2h of the plunger 2g projected towards the drilled hole 2f of the piston 2d. And the chamber 2n of the flow-rate control valve 2 is connected to a selector valve 3a. Therefore, as the operation pressure of load increases, the throttle amount increases, so the driving performance of a car can be developed efficiently even when the car ascends a slope. |
