| 摘要 |
<p>PURPOSE:To permit the combined use of running and working operations of an oil-pressure circuit by using a system in which a switch valve is switched by pilot pressure, and pressure oil from one of two sets of oil-pressure pumps is used exclusively for running operation and the oil pressure from the other pump is used for the other operation. CONSTITUTION:An oil-pressure circuit consists of oil-pressure pumps 1 and 2, a pilot oil-pressure pump 10, a prime mover to drive these pumps, and the first and second direction-switch valve groups 4 and 5. An auxiliary valve 8e' to be operated in an interlocking manner with a direction-switch valve 5e is also provided, and neutral paths 4f and 5f are closed by switching logic valves 4i and 5i. When the pressure of the pipeline 12 is raised by the pump 10 and the valve 5e is switched to the position-B, the valves 4i and 5i close the paths 4f and 5f by an auxiliary valve 5e', and pressure oil of the pump 1 flows to a direction switch valve 4b for full-amount left-side running motor. The pressure oil of the pump 2 is supplied to switch valves 4c-4e for other actuators.</p> |
