| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To inhibit an actuator from moving when loads are applied. <P>SOLUTION: When the loads are applied to an engine 1 and a pump 3 for regenerating an exhaust emission control device 2 (in load applied state), a selector valve 21 (selecting means) is at a second switching position 21b (in second state). At this time, the pump 3 and an actuator control valve 7 are intercepted from each other, and also hydraulic oil discharged from the pump 3 can return to a hydraulic oil tank 5 through a pressure control valve 9. Therefore, when the loads are applied, the hydraulic oil discharged from the pump 3 is not supplied to the actuator control valve 7. Furthermore, the hydraulic oil is not supplied to the actuator 8(8A) whose operation is controlled by the actuator control valve 7(7A). Thus, when the loads are applied, the actuator 8 can be inhibited from moving. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
