| 摘要 |
PURPOSE:To reduce the size and weight of the device and make the cost of the device inexpensive by a method wherein a servovalve is composed of a spool, formed with double-thread spiral grooves, and a sleeve, into which the spool is inserted. CONSTITUTION:The servovalve 25, which controls the switching of a servocylinder 22 highly accurately by receiving the command of rotation, is composed of the spool 27, connected to a stepping motor 29 and formed with the double- thread spiral grooves 26, and the sleeve 28, into which the spool 27 is inserted. According to this method, the servovalve 25 is made with a comparatively simple structure and the number of parts becomes the minimum. Accordingly, the size and weight of the device may be minimized and the cost of the device may be reduced. |
