Electrohydraulic pressure control mechanism

Details Electrohydraulic pressure control mechanism Electrohydraulic pressure control mechanism

1996-05-06

1998-03-03

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031131, B60T 1366, B60T 836

Patent

active

057227420

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention refers to an electrohydraulic pressure control mechanism, and more specifically to a brake retarder pressure control mechanism.


BACKGROUND OF THE INVENTION

An electrohydraulic pressure control mechanism of generic designation is, for instance, 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. This 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, as there are springs, to embed the coils into an elastic molding box. However, the implement of an elastic molding box proves to be unduly cumbersome in terms of the required task.
It is the object of the innovation 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. Additionally, the invention provides ease of manufacture and maintenance, with differing thermal expansions of assembly components and their respective tolerances being compensated for in a stress-free fashion.
It is proposed to have the molding box contain cavities fully extending from the mold box's set-down surface on the valve housing to the mold box's surface farthest removed from the valve housing and which, in proximity of the coils, appear as lead-through openings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 a longitudinal section of the pressure control mechanism of the present invention.
FIG. 2 a top view of the pressure control mechanism, depicted in FIG. 1.


DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a side projection of the pressure control mechanism with a sketch of its basic components. The longitudinal section shown extends along a valve row's valve dome axis. For emphasis on the coil casing 7, the intersection in proximity of the outer right electromagnetic valve has been shifted to molding box 1 (also compare subsequent FIG. 2). Molding box 1, fastened onto valve housing 3, consists of a high-viscosity plastic substance which, through a device, sprays or laminates around coils once the strip conductors (tracks) 10 and/or printed circuits are soldered to the contact elements 11 above coils 4. The plastics of the molding box and the plastics of the coil casing thus protect the strip conductors 10 and coils 4. To accommodate valve dome 6, molding box 1 provides liberally-proportioned lead-throughs to facilitate a sufficient radial tolerance compensation between molding box 1 and valve dome 6--in order to have molding box 1 (containing coils 4) fit easily over valve domes 6 to come to rest on valve housing 3. The lead-through openings 5 in molding box 1 are proportioned so that coil casing 7, opposite coils 4, can be comfortably fit onto valve domes 6 and, for instance, can be secured with a gripper ring 12. For this purpose, coil casing 7 need not be totally enclosed; instead, side recesses 9 lend coil casing 7 an open profile in the form of an U-leg. Within contact range of valve dome 6, the coil casing 7 takes on the shape of a bush 8, assuming the function of a yoke ring. Hence, following installation of molding box 1, and coil casing 7 on valve housing 3 over magnetic core 13, the magnetic circuit is closed.
Cavities 2 and lead-through openings 5 on molding box 1 contribute to weight and material reductions and bridge varying mechanical and thermal tolerances of compon

REFERENCES:
patent: 5040853 (1991-08-01), Burgdorf et al.
patent: 5127440 (1992-07-01), Maas et al.
patent: 5275478 (1994-01-01), Schmitt et al.
patent: 5362141 (1994-11-01), Beck et al.
patent: 5520447 (1996-05-01), Burgdorf et al.
Search Report of the German Patent Office for Application P4325410.1.
Richl, Helmuth: Trends bei der Entwicklung von Hydraulik-Ventilmagneten. In: O+P Olhydraulik und Pneumatik 35, 1991, Nr. 8, S.613-619.

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