| 摘要 |
PURPOSE:To increase the efficiency of a hydraulic driving circuit and reduce the quantity of feed oil by utilizing pressurized oil to a duo-directional type load and sending return oil of the load again into an input port of the load. CONSTITUTION:Return oil from a double-acting cylinder 3a is poured into a tank from ports B and T of a selector valve 4 via ports B and T2 of a directional control valve 6. During this operation, a hydraulic motor 7 drives a hydraulic pump 8 by the rotation thereof. For this reason, the hdraulic pump 8 upplies a part of the return oil from the double-acting cylinder 3a to the input side port of the double-acting cylinder 3a. That is, a part of the return oil is introduced into the input side of the double-acting cylinder 3a by the hydraulic pump 8 so as to be reutilized. Accordingly, the quantity of oil to be supplied from the hydraulic source 2 may be reduced by the reutilized quantity of the return oil. |
