Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-04-10
1998-12-01
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
137884, 3031131, B60T 836, B60T 1368, F15B 1308, F15B 912
Patent
active
058427538
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electrohydraulic pressure adjuster for a slip controlled vehicle brake system.
An electrohydraulic pressure adjuster of this kind is already known (German Patent Disclosure DE 41 00 967 A1), in which the coils of magnet valves are elastically resiliently suspended in a hoodlike cap so that when they are joined to a valve block they can be aligned relative to it, that is, radially and axially. To that end, elastic retainers in the form of helical compression springs are provided between the cap and the coils, in order to generate a force on the coils oriented toward the valve block. After the joining, the position of the coils is intended to be secured by means of a defined axial pressing of the coils against the valve block. However, as long as the joining operation has not yet taken place, the coils are supported in the cap on a stop, in order to absorb the force of the springs, so that contact elements that connect the coils to an electronic controller located above the coils in the cap will not be overloaded. At the same time, it is assured by the support that the springs will not be lost before the cap is joined to the coils.
ADVANTAGES OF THE INVENTION
The pressure adjuster according to the invention has the advantage of having a one-part spring element for many coils, which in the premounted state by simple nonpositive engagement assures its position on the valve block itself, yet when the coils are mounted on the valve domes relinquishes the nonpositive engagement and performed its function that axially stresses the coils. This merely utilizes the fact that the spring element, by deformation of its rib, has a longitudinal length that is shortened compared with its stretched-out length.
By the provisions recited herein, advantageous further features of and improvements to the pressure adjuster disclosed hereinafter are possible.
The embodiments of the invention recite shapings of the spring element that can be created in a simple way in order to shorten the length thereof in the unmounted state.
With the provision recited herein, a spring element is created that economizes on material and can be used for all the valves of two rows.
BRIEF DESCRIPTION OF THE DRAWING
Exemplary embodiments of the invention are shown simplified in the drawing and explained in further detail in the ensuing description. FIG. 1 shows a front view of a schematically shown pressure adjuster during the joining of coils, received in a cap, to a valve block with a spring element mounted on valve domes, in a first embodiment; FIG. 2 is a plan view on the spring element in the stretched-out state; FIG. 3 is a cross section of the spring element along the line III--III of FIG. 2 on a larger scale; and FIG. 4, in a three- dimensional view, shows a second embodiment of the spring element.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
An electrohydraulic pressure adjuster 10 shown in FIG. 1 for a slip-controlled vehicle brake system substantially comprises a valve block 11, in which valves 12 are received, and a hoodlike cap 13, with electrical elements such as coils 14 disposed in the valve block for the electromagnetic actuation of the valve 12. FIG. 1 shows a state when the cap 13 is being joined to the valve block 11. In the fully assembled state, the cap 13 is combined with the valve block 11 along one support face 15 thereof and is connected by screws, not shown.
In the valve block 11, the valves 12 are disposed coincidently in two parallel rows, located one behind the other in the plane of the drawing. The valve combined with the valve block 11 each have one valve dome 18 protruding upward at a right angle from the support face 15. The coils 14 are received in a corresponding number and arrangement inside the cap 13. They are connected to an electronic controller, not shown, disposed in the cap 13 by means of resilient electrical contact elements 19. Because of the resilience of the contact elements 19, the coils 14 can be subjected to changes of their position in the cap 13 in the axi
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Friedow Michael
Staib Helmut
Butler Douglas C.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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