Electromagnetic valve with integrated non-return valve

Details Electromagnetic valve with integrated non-return valve Electromagnetic valve with integrated non-return valve

1999-09-13

2000-07-04

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335220, 25112915, H01F 700

Patent

active

060844930

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention relates to a magnet valve with an integrated check valve. The magnet valve is intended for use as a brake pressure buildup valve, preceding a wheel brake cylinder, for a slip-controlled hydraulic vehicle brake system.
One such magnet valve is known from European Patent Disclosure EP 0 673 815 A3. Its housing is embodied as a cup-shaped sleeve with a two-piece bottom, and into this bottom a disk is inserted which has a central through bore with a valve seat on the top for an armature-actuated valve closing body. Laterally beside this flow opening, the disk has a second flow opening with a valve seat on the underside for a check valve. The flow openings have approximately the same diameter. A ball--or plate--like closing member of the check valve is received in a turned recess of the disk. A retaining part for the closing member is also located in the turned recess and is made from thin-walled sheet metal.
The known magnet valve is relatively expensive, because its housing and the disk on the bottom must be made by metal-cutting machining in an expensive way, and the closing member of the check valve and the retaining part must be inserted into the disk and the thus-supplemented disk must be inserted into the housing and secured therein by a wedged connection.
From German Patent Disclosure DE 40 30 971 A1, a magnet valve is known which has a rotationally symmetrical base body with an axial through bore. On one face end of the base body, an armature is disposed, which can be actuated by supplying current to a coil. Via a valve tappet, which reaches through the through bore of the base body, the armature actuates a valve closing body on the other side of the base body. On the side of the valve closing body, a sleeve is mounted on the base body, and the valve closing body is located in its interior. A disk-like valve seat carrier is inserted into the sleeve and has a flow opening with a valve seat with which the valve closing body of the magnet valve cooperates. The disklike valve seat carrier forms a kind of bottom of the sleeve. Below the valve seat carrier, a disk with a throttle bore, a screen filter disk, and a spacer disk between the disk having the throttle bore and the screen filter disk are received in the sleeve.


ADVANTAGES OF THE INVENTION

The magnet valve of the invention can be made especially economically, because the sleeve embodied in one piece with the bottom can be made, including the flow openings and the valve seat, without metal-cutting machining in a much more economical way than the corresponding item in the magnet valve of the generic type. Furthermore, the joining of the valve closing body of the check valve is made easier by its disposition outside the cup-shaped sleeve. Furthermore, in the embodiment of the magnet valve of the invention with a plurality of flow openings for the check valve, there is the substantial advantage that in comparison with the prior art, a flow cross section that is multiple times larger is available. When the magnet valve is used as intended as a break pressure buildup valve, the check valve as a result of this embodiment can have a flow through it in the direction from the wheel brake cylinder to the master cylinder and accordingly opens when the wheel brake pressure drops at the end of a breaking operation. This has the advantage that the reduction in the wheel brake pressure at the end of the braking operation is speeded up.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in further detail below in terms of three exemplary embodiments shown in the drawings. Shown are:
FIG. 1, an axial section through a magnet valve of the invention;
FIG. 2, an enlarged view of a detail indicated by the arrow II in FIG. 1;
FIG. 3, a modified embodiment of the magnet valve shown in FIGS. 1 and 2, in a view corresponding to FIG. 2; and
FIG. 4, a modification of the magnet valve shown in FIG. 3.


DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The magnet valve 10 of the invention, shown in FIG. 1, has an approximately rod-like base

REFERENCES:
patent: 4988967 (1991-01-01), Miller et al.
patent: 5476243 (1995-12-01), Oehler et al.

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