Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
2000-08-25
2001-11-27
Shaver, Kevin (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C251S333000, C303S119200
Reexamination Certificate
active
06322049
ABSTRACT:
PRIOR ART
The invention is based on a hydraulic, magnet-actuated valve for hydraulic brake systems of motor vehicles.
From German Patent Disclosure DE 40 31 885 A, which defines this generic type, a magnet-actuated hydraulic valve is known that has a hollow-conical valve seat of a seat valve, to which a closing body with a cylindrical shaft and a conical face end, whose conicity differs from that of the valve seat, is assigned. In the valve housing of this valve, with axial spacing from the valve seat, a guide body for pressure fluid is secured. The guide body is penetrated by the shaft of the closing body. Between the valve seat and the opposed end face of the guide body, there is an annular chamber for receiving pressure fluid that has emerged from the seat valve in the form of a hollow-closing body and, through the closing body shaft, on the actuating means of the valve.
A valve is also known (DE 41 29 638 A) in which a hollow-cylindrical guide body is press-fitted into the valve housing with spacing from the valve body. The guide body has a sleeve-like extension, oriented toward the valve body, with which a ball, secured to a valve tappet on the face end, and acting as a closing body of a seat valve is grasped approximately as far as the great circle. The extension of the guide body that is bounded in bladelike fashion toward the valve seat, changes over with a concave jacket face to the inside circumference of the valve housing, and with the valve body it defines a relatively large valve chamber of the valve housing, from which two diametrically located outflow bores of the valve housing originate. In this known embodiment, the purpose of the guide body is to divert pressure fluid that when the seat valve is open flows along the surface of the ball, and thus to prevent instabilities of the pressure fluid flow along the conical stream. Outlet openings of the valve housing originate on the circumference at the annular chamber, so that the pressure fluid undergoes a deflection. Through the shaft of the closing body, which is penetrated by a conduit, a chamber of the valve housing that contains actuating means of the valve communicates with the annular chamber when the seat valve is open and with a pressure fluid connection when the seat valve is closed. A disadvantage of this valve is that because of the deflection of the pressure fluid in the annular chamber near the valve seat, flow instabilities can develop, which can have a disruptive effect on the remains free of disruptive flow forces. The valve can therefore be controlled by known methods of electrical triggering with high precision, in infinitely graduated manner, into arbitrary reciprocation positions of its closing member.
A version of the guide body that guides the pressure fluid, after its outlet from the valve seat, in a favorable way or other words with little deflection is disclosed in hereinafter.
With the design of the guide body, shaping is disclosed that can be created advantageously from a production standpoint, for instance by injection molding.
The course of the guide conduits defined is favorable for the deflection of the pressure fluid flow from the hollow-conical stream to the annular conduit.
A unit comprising the guide body and the valve body is created in which the three-dimensional association of the two parts to one another is attained by a positive connection that is favorable from an assembly standpoint.
The refinement of the valve has an advantage that the valve housing, which fittingly grasps the spring tongues of the guide body, maintains the positive connection between the guide body and the valve body permanently.
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patent: 5836334 (1998-11-01), Mittwollen et al.
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patent: 6189983 (2001-02-01), Volz et al.
patent: 6224170 (2001-05-01), Hosoya
Ambrosi Massimo
Hofmann Dirk
Hohl Guenther
Laier Christian
Greigg Ronald E.
Keasel Eric
Robert Rosch GmbH
Shaver Kevin
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