Electrically modulated hydraulic-pressure regulating valve
AssigneeAtos Oleodinamica S.p.A.
InventorPaolo Tirelli
Life of this patent
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Abstract
This disclosure relates to a electrically modulated regulation valve for hydraulic systems, said valve essentially comprising a slider-shutter of complex shape, whose length is considerable with respect to its diameter and is housed, along an appreciable fraction of its length, in an outflow channel, the latter being cylindrical with two different internal diameters and offering a guiding surface for the slider-shutter. The slider-shutter has a prolonged conical portion from which a cylindrical rod extends, having properly shaped projections which act as guiding members. The advantage achieved is a most accurate regulation of the hydraulic pressure.
Claims27
An electrically modulated hydraulic pressure regulating valve comprising a valve body, said body defining a cylindrical space closed at one end, at least one inlet port entering said space and at least one outlet port, a fixed valve member partially housed in said cylindrical space, said fixed valve member defining an elongated cylindrical cavity having two portions of slightly different internal diameters and said cavity being closed by a wall at the end of the portion having the lesser diameter, said fixed valve member having radial passageway ports establishing a communication between said cavity and said cylindrical space, a movable valve member in the form of a slider-shutter having a complex profile including as significant component parts a frustoconical portion and a round cylindrical projection having a plurality of annular grooves in the periphery thereof, said movable valve member being slidably housed in guided relation in said cylindrical cavity with said cylindrical projection cooperating as a piston in the lesser diameter portion of said cavity, said frustoconical portion being cooperable with said fixed valve member for closing said cylindrical cavity at the greater diameter end thereof, a pressure-tight cylinder formed of magnetically different parts, a movable magnetic armature mounted for axially sliding movement in contact with said pressure-tight cylinder and inside it, a magnetic counter-armature in the form of a hollow cylinder carried by said pressure tight cylinder and having a planar and non-continuous end surface bearing against said fixed valve member so as to define a chamber having an axial bore which allows a hydraulic fluid to flow between said chamber and said pressure-tight cylinder, a pusher in the form of a rod, connected to said movable magnetic armature, said pusher passing through said axial bore of said magnetic counter-armature and acting axially against said movable valve member, an electric coiling and a magnetic yoke surrounding said pressure-tight cylinder so that said movable magnetic armature undergoes an attraction force under the influence of a current flowing through said coiling, fastening means for securing said pressure-tight cylinder and said counter-armature to said valve body;
- and sealing means preventing oozings of hydraulic fluid between said fixed valve member, said counter-armature and said pressure-tight cylinder.
Dependencies are inferred from the claim text.