| 摘要 |
<p>PURPOSE:To secure the straightforward running of a construction machine even when operating the actuator of boom, etc., during the running operation by controlling the direction and amount of pressure oil from two oil-pressure pumps by means of plural direction switching valves. CONSTITUTION:When operating an arm during the straightforward running, a switch valve 6 is switched to the position B prior to operation, and then a direction switching valve 4b for arm is operated. Whereupon, pressure oil from an oil-pressure pump 1 is supplied through the switch valve 6 and the pipeline 7 and then to a switch valve 5c through the pipeline 8. Also, pressure oil from the pump 2 is supplied to a switch valve 4d through the pipeline 9 and then to the switch valve 5c through the pipeline 10. since the pipelines 9 and 10 are led to each ether in the switch valve 6, pressure oil from the pump 1 is distributed even to the switch valve 4d. The oil can thus be uniformly distributed to left and right-handed running motors to secure the straightforward running of construction machine, and the operation of various actuators can be exactly secured.</p> |
