| 摘要 |
PURPOSE:To promptly further accurately perform positioning by constituting a device fixing a locating bush, having a port part communicating with a clamp port, to a motor main unit independently of a sleeve. CONSTITUTION:In case of an external load being different, a relative position between a sleeve 40 and a spool 36 is adjusted by meshing a peripheral thread part 46 of the sleeve 40 with an internal peripheral thread crest 50 of a sleeve cover 48 in a manner wherein pressure oil is conducted to a clamp port in the good timing before completing positioning. Here because a locating bush 42 is independent of the sleeve 40 not changing a position for the spool 36, its peripheral groove is placed in a fixed position relation to an internal peripheral surface groove of the bush 42 opposed facing to the peripheral groove of the spool 36. Accordingly, despite the initial adjustment however it may be performed when the external load is changed, the pressure oil is supplied to the clamp port even in the fixed timing. |
