Pressure control valve

Details Pressure control valve Pressure control valve

1994-05-11

1996-04-02

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762537, 25112902, 25112907, 25112908, 3031192, F16K 4700, F16K 4100, F16K 3106, F16K 114

Patent

active

055031846

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to pressure control valves, and in particular to electromagnetic valves for slip-controlled brake units for automotive vehicles.


BACKGROUND OF THE INVENTION

In the German patent application No. 41 03 365.5 a pressure control valve being controllable by an electromagnet is described whose tappet-shaped valve-closing member controls the passage between a first pressure agent connection and a second pressure agent connection in the range of a funnel-shaped valve seat surface depending on the stroke. For safeguarding, a pressure-balanced valve actuation and a pressure balancing duct connect the magnet armature chamber (being shielded) by means of a packing seal.
The prior-art valve design generates much noise during the impulse like valve switching phases. This noise is primarily caused by the valve-closing member striking against the valve seat and by the nonsteady flow attitude and, thus, the discontinuous flow around the valve-closing member on account of the binary valve switching positions.
It is, therefore, the object of the invention to improve a pressure control valve of the prior art so that the noise problems are overcome while simultaneously guaranteeing reliable operation and a comparatively simple-design structure.
In accordance with the present invention, the pressure agent transition ducts (to be shut off or to be opened up directly one after the other by the valve-closing member) are positioned between the first and the second pressure agent connections. The pressure agent transition ducts have a cross-sectional area of the valve opening which is variable by steps.


BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 shows a cross sectional view of the electromagnetically actuatable pressure control valve of the present invention with pressure agent transition ducts positioned in the valve seat element; and
FIG. 2 shows an advantageous design version for the positioning of pressure agent transition ducts within a valve seat.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a valve tappet 11 which in the electromagnetically de-energized normal position is switched to permanent pressure agent passage, which is furnished with a valve-closing member 4 and which controls the pressure agent connection between a pressure agent source, for example, coming from a brake pressure master unit, through a first pressure agent connection 2, and the consumer-side second pressure agent connection 3 being, for example, connected on the side of the wheel brake.
A second pressure chamber 12 connecting the first to the second pressure agent connection 2, 3 accommodates a sealing element 14 which seals off the valve tappet 11 with respect to a first pressure chamber 13. The sealing element 14 is retained at a front surface of a guide element 16 by means of a compression spring 15 which is positioned within the second pressure chamber 12. The guide element 16 being retained by means of caulking between the offset opening within the valve housing 17. The magnet core 5 preferably has a disc-shaped configuration whose bore being disposed coaxially is penetrated with play by the valve tappet 11.
In the section of said magnet core 5 facing the guide element 16 there is a stepped bore for the accommodation of a second spring 15' which positions a sealing element 14 on the opposite front surface of the guide element 16, (analogous to the first spring 15). In this way it is guaranteed that notwithstanding a fit dimensioned with a relatively abundant play between the valve tappet 11 and the bore of the guide element 16 a sufficient sealing effect between the first pressure chamber and the second pressure chamber comes about.
In this configuration, the first pressure chamber 13 facing the magnet core 5 extends along the valve tappet 11 into the cavity of the valve dome. A permanent pressure compensation between the consumer-side second pressure agent connection 3 and the first pressure chamber 13 takes place through corresponding, transversely extending recesses at the front sur

REFERENCES:
patent: 2615671 (1952-10-01), Landon
patent: 3521853 (1970-07-01), Gillis et al.
patent: 3684238 (1972-08-01), Michellone et al.
patent: 3704726 (1972-12-01), Lewis
patent: 3811465 (1974-05-01), Abbey
patent: 4108210 (1978-08-01), Luthe et al.
patent: 4643227 (1987-02-01), Suzuki et al.
patent: 4762146 (1988-08-01), Ewbank et al.
patent: 4892118 (1990-01-01), Davis et al.
patent: 5050642 (1991-09-01), Bright
patent: 5076538 (1991-12-01), Mohr et al.
PCT Publication No. WO92/13741 published 20 Aug. 1992.
PCT Publication No. WO92/04214 published 19 Mar. 1992.

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