| 摘要 |
PURPOSE:To improve operability in a device for driving a single-rod cylinder by a double swash plate pump by correcting a drive signal of a regulator for regulating the discharge quantity of the pump in response to the pressure on head side and rod side of the cylinder. CONSTITUTION:A hydraulic closed circuit device includes a flushing valve 5 and a charge system 9 which are interposed between pipelines 3, 4 for conducting the discharge oil of a double swash plate pump 2 to the head side and the rod side of a single-rod cylinder 1. In the device, a treatment device 17 is further interposed between an operation lever 13 and a regulator 12 operated by the operation lever 13 to regulate the discharge direction and the discharge capacity of the double swash plate pump 2. Each output signal of pressure gauges 15, 16 for detecting the pressure P1, P2 in the pipelines 3, 4 is input to the treatment device 17. If P1<P2, the regulator 12 is controlled by a drive signal L' obtained by multiplying an operation amount signal L of the operation lever 13 by a coefficient S2/S1 which is the ratio of the area S1 on head side to the area S2 on rod side. |
