| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve the reliability and the safety of control by pressurization-controlling a push-side chamber or a pull-side chamber in a pressurization process of the push-side chamber or the pull-side chamber by using a discharge-amount variable pump, by depressurization-controlling the chambers by using a high-speed on/off-valve connected to a push-side duct or a high-speed on/off-valve conncted to a pull-side duct, and by pressurization-controlling the pull-side chamber or the push-side chamber that opposes the push-side chamber or the pull-side chamber that is depressurization-controlled via a pull-side selector valve or a push-side selector valve by using the discharge-amount variable pump. <P>SOLUTION: The push-side selector valve 2 is connected to the push-side chamber S of an hydraulic actuator 1, and the pull-side selector valve 3 is connected to the pull-side chamber L. A liquid supply duct 6 is connected to the selector valve on each of the push and pull sides. A liquid return duct 9 is connected to each of a push-side duct 7 connecting the push-side selector valve to the push-side chamber and a pull-side duct 8 connecting the pull-side selector valve to the pull-side chamber. The high-speed on/off-valve 11/12 is provided in each liquid return duct. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
