Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-03-11
1997-09-02
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031131, B60T 836
Patent
active
056623925
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrohydraulic pressure control device, in particular a braking pressure control devices for vehicles.
BACKGROUND OF THE INVENTION
An electrohydraulic pressure control device of the generic type is disclosed as an example in international publication No. WO 92/12878, wherein, in addition to the sufficiently known modular construction of the valve accommodating member, the lid is subdivided by a plate-shaped carrier element in order to accommodate an electronic controller or component parts of an electronic controller, and to provide the electrical connection between the electronic controller and the contact elements projecting from the solenoid valves. The lid, along with the coils of the solenoid valves, is slipped on the valve domes of the valve accommodating member, and plug contacts engage into each other for making the electrical connection between the contact elements and the electronic or electric components integrated in the lid. For the attachment of the coils to the carrier element, elastic mounts, for example, springs, are used, or the coils are embedded in an elastic shaped part. The elastic mounting means and shaped parts are complex in terms of their dimensioning and positioning on the coils.
Thus, an object of the present invention is to improve the pressure control device known from the previously mentioned state of the art such as to provide a simple positioning of the coils and a compact and functionally optimized assembly of the coils with respect to the carrier element, the assembly permitting to be manufactured and tested as easily as possible, while varying heat expansions of the component parts and component tolerances shall be absorbed with least possible tension.
It is proposed that the coils be arranged within a shaped part which includes stops pressing the sleeves, that are movable into abutment on the valve domes, on the coil casing which conducts the magnetic flux.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cross-sectional view of a pressure control device including the features of the present invention.
FIG. 2 is an alterative embodiment of the stops, the sleeves and the coil casing for a pressure control device.
FIG. 3 is a view of a special fixing means and the abutment surfaces for the coils in the shaped part.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows part of a cross-section of a first embodiment of the pressure control device of the present invention. The pressure control device includes a block-shaped valve accommodating member 15. A plurality of parallel arranged valve domes 4 which project from the top side of the valve accommodating member and receive coils 1 of the electromagnetic inlet and outlet valves of a slip-controlled brake system and coil casings 6 and sleeves 5 associated with the coils 1. The sleeves 5 function as yoke rings, for abutting the peripheral surface of each valve dome 4 and the coil casing 6. This is effected by way of compression springs, acting as stops 3, which are provided in cavities 8 of a shaped part 2 that is inserted over the solenoid valves and secured to the valve accommodating member 15. Also, the shaped part 2 accommodates the coils 1 at their coil casings 6 without clearance. Thus, component tolerances between the valve domes 4 and the sleeves 5 are compensated in each case by way of an annular slot 16 between the bowl-shaped coil casing 6 and the sleeve 5. Contacting of a bead 7 shaped on the sleeve 5 with the coil casing 6 is possible because a compression spring is placed in the cavity 8 above each valve dome 4. The compression spring permits a yielding support in the direction of the axis of the valve dome so that component tolerances between the coils 1 and the shaped part 2 in the direction of the valve dome axis can also be compensated. An insulating material 9 of the coils 1 forms a rigid connection with the coil casing 6 which is made of steel like the respectively associated sleeve 5. Contact elements 11 associated with the coi
REFERENCES:
patent: 3403884 (1968-10-01), Noakes et al.
patent: 5374114 (1994-12-01), Burgdorf et al.
patent: 5520447 (1996-05-01), Burgdorf et al.
Search Report of the German Patent Office for Application No. P4330827.9.
Butler Douglas C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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