Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-08-25
1999-08-10
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
1376275, B60T 836
Patent
active
059347660
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a pressure control valve, in particular an electrically operable multi-way valve for hydraulic automotive vehicle brake systems with wheel slip control.
German patent No. 29 09 504 discloses a pressure control valve wherein the valve tappet is configured as a slide valve for pressure control in order to provide a pressure fluid connection between a first and a second pressure fluid port in a first switch position and to separate the above-mentioned pressure fluid ports in a second switch position of the valve slide. In the third switch position, the valve tappet will open a spherical non-return valve, thereby opening another pressure fluid connection to the second pressure fluid port.
However, a shortcoming of the pressure control valve is that the valve slide, on the one hand, necessitates a high degree of fitting precision to be able to govern leakage flows at the control edge which are responsive to manufacture and temperature. On the other hand, no provision is made to ensure the pressure reduction in the connected line system in case the valve slide becomes jammed.
European patent No. 0 353 635 discloses a valve assembly having a slide valve which acts as a flow control valve. The flow control valve generally has a piston which controls the volume flow between a pressure fluid source and a pressure fluid consumer as a function of the switch position of an electromagnetically operated actuating member. To perform this function, the piston has a relatively long stem with through-bores which include control edges. The control edges cover the pressure fluid channels of the pressure fluid consumer or the pressure fluid source which open radially into the valve housing. Undesired leakage due to the annular slot in the area of the control edge cannot be prevented in spite of the relatively long piston stem. Further, the serial arrangement of the flow control valve and the electromagnetically operable actuating member causes a substantial structural volume of the valve assembly. Sealing problems which are typical of slide valves will occur.
OBJECT OF THE INVENTION
Therefore, an object of the present invention is to provide a pressure control valve which ensures a functionally reliable pressure control and a compact and miniaturized structure by simple means. In particular, the pressure fluid supply shall be achieved by using a seat valve and a fluid volume which is as independent as possible of the tandem master cylinder pressure, thereby contributing to minimizing valve switching noises. In addition, the valve shall permit a pressure-maintain phase and generally include a quick-reaction operation at low response forces.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved by the characterizing features of patent claim 1, wherein another valve closure member is arranged in the valve housing so as to be displaceable in relation to the valve tappet. The valve closure member provides an unimpeded pressure fluid connection between the first pressure fluid port and the second pressure fluid port in a first operating position and interrupts the pressure fluid connection between the first and the second pressure fluid port in another operating position. In the first operating position, the valve closure member has a metering orifice at a bore step with a valve opening cross-section which controls the pressure fluid volume flow between the first and the second pressure fluid port.
Further objects, features, advantages and possible applications of the present invention can be seen in the following description of an embodiment.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows a pressure control valve, in a longitudinal cross-sectional view which is enlarged several times.
DETAILED DESCRIPTION OF THE DRAWING
A valve housing 1 of the pressure control valve, having a cartridge design, is retained in a valve block in a caulked manner. A deepdrawn valve sleeve 11 is retained in the valve housing 1 made of steel by a caulke
REFERENCES:
patent: 5186093 (1993-02-01), Kervagoret
patent: 5503184 (1996-04-01), Reinartz et al.
patent: 5641211 (1997-06-01), Feigel et al.
Feigel Hans-Jorg
Klein Andreas
Neumann Ulrich
Schiel Lothar
Graham Matthew C.
ITT Manufacturing Enterprises Inc.
LandOfFree
Magnetically operated, multi-position, pressure control valve ha does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetically operated, multi-position, pressure control valve ha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetically operated, multi-position, pressure control valve ha will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1112651