| 摘要 |
PURPOSE:To eliminate a trouble caused by the contamination of fluid, by engaging a feed screw with the piston of a cylinder, having two operating fluid pressure chambers, and driving the feed screw by an air motor controlled through a position sensor signal of a hydraulic actuator. CONSTITUTION:A feed screw 6 is engaged with a piston 5, having two operating fluid pressure chambers 8, 9, in a cylinder 2. Then an air motor 1, being connected to the feed screw 6, is driven and controlled by a position sensor signal of a hydraulic actuator. In this way, fluid in each operating fluid pressure chamber 8, 9 of the cylinder 2 is allowed to independently flow only shuttling between said chamber and the hydraulic actuator respectively without causing any necessity for interposing a valve or the like in the half way, thus hardly causing any trouble due to the contamination of the fluid and generation of heat due to the friction of a flow of the fluid.
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