| 摘要 |
<p>PURPOSE:To save energy to be required for an operation mechanism by connecting the pressure oil of the third oil-pressure pump of the first - third oil-pressure pumps to be driven by one engine to the first and second oil-pressure circuits through a switch valve to be switched and operated by a pilot pressure. CONSTITUTION:The pressure oil of the first oil-pressure pump P1 is connected to a multiple control valve C/V through the main circuit 1 and a pressure control valve 2. On the other hand, the pressure oil of the second oil-pressure pump P2 is connected to another multiple control valve C/V through the main circuit 1 and the control valve 2. The pressure oil of the third oil-pressure pump P3 is led to the main circuit of the first and second oil-pressure pumps through a pilot direction switch valve 3 and a flow-dividing valve 7. The switch valve 3 is operated by the pilot pressure of each main circuit, and the pressure oil of the pump P3 is discharged to the tank T through the flow path 6 and also the first, second, and third pumps are connected to the same engine.</p> |
