Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1995-10-30
1998-03-03
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
439140, 439248, B60T 836
Patent
active
057227411
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrohydraulic pressure control device, and in particular relates to a braking pressure control device and a method of manufacturing a pressure control device of this type.
BACKGROUND OFT HE INVENTION
A generic electrohydraulic pressure control device is described as an example in international publication WO 92/12878 wherein, apart from the sufficiently known modular construction of the valve-accommodating member, the cover is subdivided by a plate-shaped carrier element to accommodate an electronic controller or parts of an electronic controller, on the one hand, and to establish the electrical connection between the electronic controller and the contact elements projecting from the solenoid valves, on the other hand. The cover along with the coils of the solenoid valves is plugged onto the valve domes of the valve-accommodating member, and plug contacts engage into each other for providing the electrical connection between the contact elements and the electronic or electric components integrated in the cover. To attach the coils to the carrier element, it is suggested using elastic attaching means, for example springs, or embedding the coils in an elastic shaped member. Both variants require simplification.
Thus, an object of the present invention is to improve the pressure control device disclosed in the mentioned prior art and to provide a compact and functionally optimized assembly of the coils on the carrier element which permits maximum ease of manufacture and testing and allows receiving different heat expansions of the component parts with least possible tension. In addition, an appropriate method of manufacturing a pressure control device of this type is to be achieved.
This object is achieved by arranging projections on the bottom side of the carrier element close to the coils to enclose the electric contact elements that project from the coils, the projections having cavities to receive adhesive material which establishes an operative connection with the projections by enclosing the contact elements. Regarding the manufacturing method, it is suggested to provide the contact elements or the cavities in the projections with an adhesive material in the form of hot-setting adhesive pills. After soldering of the electric conducting paths, the pills are melted, and the carrier element, for the purpose of anti-corrosion conservation of the electric contacts, having a quickly hardening sealing compound or, alternatively, a frame bounding the carrier element forms a covering which is either cemented or welded to the carrier element.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cross-section of two alternative embodiments, united in a side view of the pressure control device according to the present invention.
FIG. 2 is a view, in a cross-sectional plane, lying behind the two coils in FIG. 1, of the arrangement of the attaching element for the two alternative embodiments of the carrier element.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a side view of the pressure control device according to the present invention in which the basic components are outlined. The left-hand half of the pressure control device, illustrated with respect to the vertical axis of symmetry of the elements, in a first embodiment includes a cover shown in profiled cross-section. The cover has a carrier element 2 including a plurality of conducting paths 7 and a frame 8 formed on top of it as a covering. The right-hand half of the pressure control device, illustrated with respect to the vertical axis of symmetry of the elements, shows another alternative embodiment of the coil covering, where the carrier element 2 including the conducting paths 7 has a frame 8 in which an anti-corrosion sealing compound 11 is filled for covering the conducting paths 7 and the coil contact elements 4 connected to them. Irrespective of the chosen individual view on the two design variants for the covering of the coils, the carrier element 2 is provided as a pr
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Graham Matthew C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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