Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-10-04
1996-04-30
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031131, 303901, 303900, B60T 836
Patent
active
055118640
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to electromagnetic valves, and in particular, electromagnetic valves for hydraulic braking systems provided with a slip control.
BACKGROUND OF THE INVENTION
German Patent Application No. P 41 41 546.9 teaches an electromagnetic valve (for controlling pressure fluid flow), that includes a valve seat member firmly caulked within a valve supporting member, wherein the valve seat member comprises a diaphragm bore. The valve seat member, prior to final valve assembly, is placed into the bore section of a valve support member so that the adjustment of the valve seat member (oriented by the tolerances of the individual components) cannot be effected. The valve seat member is positioned to conform to the shape of the bore step and is held in caulked position. Moreover, the electromagnetic valve described in the afore-mentioned patent application has the disadvantage that, as a result of the limited structural volume available, no provision is made for the integration in the valve support member of a check valve which is a common requirement for hydraulic braking systems having a slip control. A further disadvantage is found in the aforementioned valve inasmuch as the diaphragm bore with the valve seat member forms a unit caulked within the valve support member, no individual adjustment of the diaphragm can be performed.
It is, therefore, the object of the invention to provide an easy-to-manufacture electromagnetic valve enabling, by simple means, a precise adjustment of the axial air gap required between the magnetic core and the hold-on magnet and permitting customs selection of the diaphragm member without requiring any substantial modification of the electromagnetic valve.
These objects, in the practice of the invention, have been fulfilled by the present invention which includes a valve seat member that is coaxially displaceable with respect to a valve needle, thereby providing in a simple manner, through a corresponding design of the valve support member and the valve seat member, a versatile and compact electromagnetic valve.
Advantageous embodiments of the invention are hereinafter described and explained in closer detail in connection with additional features and advantages of the invention and with reference to the drawings, a brief description of which follows.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of an electromagnetic valve open in the basic position.
FIG. 2 is an alternative form of embodiment of the valve seat member within a sectionally shown electromagnetic valve.
FIG. 3 shows another form of embodiment of the valve seat member and of the check valve.
Referring to the drawings, FIG. 1 shows a cross-section through the electromagnetic valve of the present invention open in the basic position. The electromagnetic valve is located in a block-type valve-accommodating member 8 (not specified in any closer detail) which is preferably made of aluminum. Individually, the following description refers to the components of the electromagnetic valve that are of inventive relevance.
The electromagnetic valve comprises the valve support member 5 inserted in the stepped housing bore of the valve-accommodating member 8. The valve supporting member 5 functions to control the flow of fluid through the pressure fluid channels 9,9' provided in the housing bore. Valve support member 5 is sealed within the stepped housing bore by way of circumferential seals 10,10'. The various dimensions of the valve support member 5 are so adapted to the housing bore that a recess is provided circumferentially about the valve supporting member 5 (which, in the drawing, is located at the level of the valve closure member) such that an annular chamber of the housing accommodating an annular filter 11 is created which, through the pressure fluid channel 9' configured as a transverse bore, establishes the pressure fluid connection between the pressure fluid channel 9 (which, in the drawing, is located below the valve needle 2), and the afore-mentioned pressu
REFERENCES:
patent: 4620565 (1986-11-01), Brown
patent: 4638974 (1987-01-01), Zeuner et al.
Beck Erhard
Dinkel Dieter
Reinartz Hans-Dieter
Butler Douglas C.
ITT Automotive Europe GmbH
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