| 摘要 |
A distributing unit for a dual-action hydraulic electro-distributor of the type comprising, firstly, a distribution stage provided with a bore in which a slide is mounted so as to slide between two end positions with a spring return to a central or neutral position and, secondly, a piloting stage with valves controlled selectively by solenoids, each of the valves being adapted, when actuated, to communicate the feed pressure to the corresponding end of the slide and, when not actuated, to set the corresponding end chamber of the bore to return to the tank, wherein untimely displacement of the slide, e.g. in the case of breakage of one of the return-to-neutral springs, is avoided by providing for the slide to comprise a tubular element with two push rods mounted to slide in an axial direction with a seal at its ends, the two push rods being held in abutment with shoulders formed at the ends of the slide by the action of the feed pressure, which is exerted on the surfaces of the push rods facing towards one another, through an orifice formed in the central portion of the slide, the opposed surfaces of the push rods projecting out of the slide and being kept applied to the end walls of the bore when the solenoids are not energized.
|
