| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent run-out of a hydraulic fluid supplied to an actuator from a booster cylinder, while saving energy, without always rotating an electric motor for rotating a pump. <P>SOLUTION: This hydraulic device has the electric motor 6, the pump 7 driven by the electric motor 6 and sucking and delivering the hydraulic fluid, and a booster cylinder 50 for boosting and supplying the inside hydraulic fluid to the actuator. The booster cylinder 50 is provided with a first detecting means 71A issuing a detecting signal by detecting that a piston rod 63 moves to one preset position in response to reduction in the hydraulic fluid filled in a small cylinder part 52, and a second detecting means 71B issuing a detecting signal by detecting that the piston rod 63 moves to the other preset position by filling the hydraulic fluid in the small cylinder part 52. The hydraulic fluid delivered from the pump 7 is supplied in the small cylinder part 52 by driving the pump 7 by the detecting signal from the first detecting means 71A, and the electric motor 6 is stopped by the detecting signal from the second detecting means 71B. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
