| 摘要 |
PURPOSE:To prevent the tortuous or zigzagged traveling of an oil-pressure drive machine by a method in which when composite operations of traveling action and other operating elements are made, oils of different oil-pressure pumps are supplied to a traveling actuator and other actuators. CONSTITUTION:By operation of a switching valve 13 for right-side traveling of the first oil pressure circuit 12, a valve 31 is operated to close a pipeline 12a to stop the supply of pressure oil from the first oil-pressure pump 11 to boom-switching valve 14 on the downstream side, a bucket-switching valve 15, and an arm-switching valve 16 side. When a slewing-switching valve 43 on the second oil-pressure circuit 42, a boom-switching valve 44 or arm-switching valve 45, and a traveling-switching valve 46 are operated, the valves 34 and 35 are operated. A branched pipeline 35 is further connected and oil from the pump 11 is supplied through a throttle 34a to the valves 43, 44, and 45. Under the condition that the straightforwardness of traveling is kept, the actuator for boom and the actuator for arm are concurrently operated.
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