| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device of a hydraulic actuator for enhancing versatility by diverting hydraulic pressure of a bypass oil passage to the other use at ordinary time of not causing failure. <P>SOLUTION: This control device has a first switching valve 70e switchably connecting a high pressure oil passage 70c to any of first and second operation chambers, a flow regulating valve 70f adjusting a flow rate of a hydraulic fluid supplied to the operation chambers via the first switching valve, a second switching valve 70h freely switching the high pressure oil passage between a first position connected to a main oil passage 70c1 connected to the flow regulating valve and the bypass oil passage 70c2 for bypassing and a second position connected only to the bypass oil passage, a bypass valve 70i switchably connecting any of the main oil passage and the bypass oil passage to the first switching valve, and a control means for connecting the bypass oil passage to the first switching valve via the bypass valve, by switching the second switching valve to the second position, when detecting the failure of the flow regulating valve. <P>COPYRIGHT: (C)2009,JPO&INPIT |
