Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-07-20
2000-02-08
Schwartz, Chris
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031191, B60T 836, F16K 3106, F16K 2708
Patent
active
060220864
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an electromagnetic valve with pressure control function, specially for hydraulic motor vehicle brake systems with slip control and/or automatic brake engagement for control of the dynamics of vehicle movement.
BACKGROUND OF THE INVENTION
An electromagnetic valve with pressure control function according to the generic type proceeds from DE 40 28 447 A1. This electromagnetic valve combines the functions of hydraulic control between a brake pressure transmitter and a wheel brake with control of the system pressure in the sense of a hydraulically actuated pressure control valve during drive slip control. To reduce noise behavior the valve rocker is centered within a rocker guide relative to the valve face. For this reason the rocker guide is located on the valve face. However this has the disadvantage that both measures to attach the rocker guide in the valve chamber must be taken and there is also additional production cost for manufacture of the rocker guide. Moreover, the flow behavior in the area of the valve face is adversely affected.
SUMMARY OF THE INVENTION
The object of the invention is to improve an electromagnetic valve of the initially mentioned type such that with low production cost advantageous guidance of the valve rocker arises, which is characterized moreover with respect to the acoustics of the electromagnetic valve by extremely low noise emission and has no adverse effect on the flow behavior.
This object is achieved according to the invention by an extension on the magnetic core which extends in the direction to the valve face, the valve rocker is being guided in the radial direction in extension.
Thus the invention is based on the idea of guiding the valve rocker over a suitable length in the magnetic core, for which in particular an extension attached to the magnetic core is suitable.
Further objects, features, and advantages of the present invention will become more apparent to those skilled in the art as the nature of the invention is better understood from the accompanying drawings and detailed descriptions.
BRIEF DESCRIPTION OF THE DRAWING
For the purpose of illustrating the invention, there is shown in the drawing a form which is presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown.
FIG. 1 is a cross-sectional view of an electromagnetic valve in the electromagnetically unexcited open valve switching position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawing, wherein like numerals indicate like elements, FIG. 1 shows in cross section an electromagnetic valve in the electromagnetically unexcited open valve switching position. A magnetic core 1 is kept caulked (retained with a high force) in a valve chamber 11 with a valve sleeve 13 which is drawn to be relatively thin-walled from austenitic steel and which holds a magnetic coil 14. The valve chamber 11 is defined by a valve chamber housing 22. A reset spring 8 which is tensioned between the magnetic core 1 and a magnetic armature 7 provides for lifting of a valve rocker 4 from a valve face 3 in the electromagnetically unexcited base position. A pressure control spring 9 located in a coaxial step hole 20 of the magnetic armature 7 keeps the valve rocker 4 in the base position of the valve on its stop 10 within the magnetic armature 7. Between the front of the magnetic armature 7 and the magnetic core 1 there is preferably a non-ferromagnetic disk which however is not further emphasized in the drawing, but which prevents the undesirable and relatively well-known sticking of the magnetic armature 7 on the magnetic core 1 during electromagnetic actuation.
The valve chamber 11 is produced as a cartridge and consists of machining steel so that according to its chamber gradation, it can be held by form- or force-fit for example in a lightweight metal valve receiver body, not shown. A first hydraulic channel 12 which discharges radially at the level of the valve rock
REFERENCES:
patent: 5318066 (1994-06-01), Burgdorf et al.
patent: 5474106 (1995-12-01), Burgdorf et al.
patent: 5603483 (1997-02-01), Reuter et al.
Plevy Arthur L.
Schwartz Chris
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