Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-06-06
1999-02-02
Poon, Peter M.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031193, 137884, B60T 836
Patent
active
058655115
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention generally relates to electrohydraulic pressure control mechanisms, and more particularly to a brake (retarder) pressure control mechanism.
BACKGROUND OF THE INVENTION
An electrohydraulic pressure control mechanism of generic designation is described in the international publication WO 92/12878. Here, aside from the commonly known modular assembly of the valve housing, the lid is sectioned by way of a flat panel support element. For one, the design serves the purpose of accommodating an electronic regulator or parts thereof and, secondarily, it establishes an electric connection between the electronic regulator and the overhead contact elements of the electromagnetic valves. The lid, along with the coils of the electromagnetic valves, is attached to the valve domes of the valve housing. Insert contacts lock to bring about an electric connection between the contact elements and the electronic or electric components now integrated in the lid. Recommended fastening of the coils to the support element is achieved by the use of elastic mounts (such as springs) or else by embedding the coils into an elastic moulding box. However, these elastic mounts prove to be unduly cumbersome in terms of their configuration.
It is the intent of the present invention to improve the conventional state of technology pressure control mechanism. The goal is to achieve a simplified coil configuration and to arrive at a compact, yet functionally optimal coil arrangement to harmonize with the support element. Its purpose is to ease the manufacture and maintenance of the pressure control mechanism, while still accommodating differing thermal expansions of assembly components and their respective tolerances being compensated for in a stress-free fashion.
The present invention accomplishes these objective by having on the underside of an essentially flat panel support element, bushes attached which respond to spring elements arrayed alongside the valve domes.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross sectional view of the conceptual pressure control mechanism of the present invention.
FIG. 2 is a top view of a second embodiment of the present invention showing the electric contact elements in a side projection of the pressure control mechanism.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a side projection of the pressure control mechanism of the present invention with an outline of the basic components. The depicted right section of the mechanism consists of a profile of lid 12 which rests on support element 2, and its several strip conductors (tracks) 14. Below support element 2, a frame 10 delimits one of several coils 1 of the electromagnetic valves. For reception of contact elements 13 (jutting out from coils 1) the support element 2 is equipped with several lead-throughs 7 which are filled with sealer 8 of coils 1. The sealer 8 is formed from a plastic, which is anchored to the support element 2 of each coil. Support element 2 is a steel plate sandwiched between lid 12 and valve housing 9 and resting in an essentially horizontal position on the contact elements 13 of coils 1. It has bonded to its lower side tubular elements 6 which accept coils 1, in turn being protected by sealer 8. Tubular elements 6 of steel are welded to the underside of support element 2. The block shaped valve housing 9 is also formed from steel and bears valve domes 5. After spring elements 4 and bushes 3 are attached to coils 1 (being anchored to the support element 2) the latter is fitted onto valve domes 5, which have been arranged in two parallel rows (not specifically shown). Relative to coils 1, the bushes 3, being under the load of pressure springs, exhibit a large-dimensioned radial air gap which permits alignment and docking of coils 1 with valve housing 9. This is done independently of assembly component tolerances. The differential of vertical assembly component tolerances in the field of coil suspension is compensated for by the elastic support of bush 3. Despite comparatively l
REFERENCES:
patent: 5141298 (1992-08-01), Von Hayn et al.
Richl, Helmuth: Trends bei der Entwicklung von Hydraulik-Ventilmagneten. In: 0+P 01hydraulik und Pneumatik 35, 1991, Nr.8, s.613-619.
Czarnetzki Edwin
Hinz Axel
ITT Automotive Europe GmbH
Lewis J. Gordon
Poon Peter M.
Twomey Thomas N.
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