Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
2000-11-09
2001-06-26
Butler, Douglas C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S901000
Reexamination Certificate
active
06250725
ABSTRACT:
PRIOR ART
The invention is based on a barrier valve for slip-controlled hydraulic brake systems of motor vehicles.
A barrier valve of this type for hydraulic motor vehicle brake systems is already known (German Patent DE 40 41 506 C2), in which the tappet, from the closing position of the seat valve, plunges counter to the force of the compression spring into the armature if the response pressure for making the pressure limiting function operative is exceeded. If the hydraulic forces acting on the closing body of the seat valve decrease, then the tappet moves together with the closing body in the direction of the valve seat, because of the spring force of the compression spring in the armature, and is exposed to more or less sharply decreasing longitudinal vibrations in the flow cross section of the seat valve before closure of the seat valve occurs. This causes irritating flow noises.
ADVANTAGES OF THE INVENTION
The barrier valve according to the invention has the advantage over the prior art that because of the stroke limitation of the tappet in the pressure-limiting opening of the seat valve, an “excess stroke” of the tappet is avoided, and upon closure of the seat valve out of the pressure limiting function, the tappet is moved without vibration into the closing position. This might be ascribed to the fact that the stroke limitation of the tappet results in largely stable flow conditions at the closing body, which prevents longitudinal vibration from occurring when the hydraulic forces are lessening.
By the provisions recited, advantageous refinements of and improvements to the barrier valve defined herein are attained.
In terms of the function and structural design of the barrier valve, the provisions recited herein are highly advantageous, because of their simple design, their manufacture at favorable cost, and the assembly of the affected individual parts of the valve.
Since the tappet, with the interposition of the support body, cooperates functionally with the compression spring located inside the armature, the embodiment of the support body herein is advantageous, because as a result the tappet can be provided with a flat end face, which makes it less expensive to produce.
With the adaptation of the components of the barrier valve as recited herein, teaching is provided with which the above-described mode of operation for pressure limitation is assured.
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Mueller Robert
Schnalzger Guenther
Zimmermann Peter
Butler Douglas C.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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