| 摘要 |
PURPOSE: To eliminate the need of reversing operation of an electric motor for generating oil pressure by providing on control circuit for controlling first opening and closing solenoid valve and switching solenoid valve and second opening and closing solenoid valve and switching solenoid valve according to the operation input. CONSTITUTION: Oil pressure is supplied to a first hydraulic circuit 10 and a second hydraulic circuit 20 in common by one hydraulic pump 4. The supply control for the oil pressure is conducted according to the operation input, so that in the first hydraulic circuit 10, the first opening and closing solenoid valve 11 opens and closes an oil pressure path to a first cylinder, and the first switching solenoid valve 12 switches the oil pressure supply direction of the first cylinder 1. In the second hydraulic circuit 20, the second opening and closing solenoid valve 21 opens and closes an oil pressure path to a second cylinder 3, and the second switching solenoid valve 22 switches the oil pressure supply direction to the second cylinder 3. These four solenoid valves 11, 12 and 21, 22 are controlled by one control circuit 6. Thus, the need of reversing operation of an electric motor 5 for generating oil pressure can be eliminated so as to reduce the manufacturing cost. |
