Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-11-20
1998-09-08
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
13761419, 13761421, 25112902, 3031131, 303900, B60T 836, B60T 850, B60T 838
Patent
active
058035567
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention pertains to a hydraulic brake system with skid control and more specifically to such a system having an annular piston controlling a passage with a selectable flow area disposed in a main pressure line between an inlet valve and a wheel brake.
BACKGROUND OF THE INVENTION
The discontinuous pressure medium control in skid-controlled brake systems produced by means of digitally switchable (on-off) inlet and outlet valves leads to an undesirable sound emission due to the impulse-like pressure profile.
Known solutions for arranging the annular piston provided with the switchable or selectable flow area as well as the details in the magnetic inlet valve which correspond to the annular piston require an additional structural simplification in order to attain the simplest and smallest design of the inlet valve.
SUMMARY OF THE INVENTION
The invention is based on the objective of disclosing solutions for miniaturizing the inlet valve while maintaining the same control arrangement of the brake system disclosed in the main application, with said solutions being realized inexpensively and without limiting the proper function of the inlet valve.
The annular piston used to switch or select flow area is guided in the valve support concentric to the valve closing element of the inlet valve, namely inside of an annular space, and includes a restrictive flow passage. Alternatively, the restrictive flow passage may be integrated into the magnetic core separately of the annular piston.
In this way, the annular space which originally accommodated an annular filter and the valve closing element simultaneously serves for integrating the annular piston and the restrictive passage such that the exterior dimensions of the valve support as well as the dimensions of the graduated bore of the valve receptacle body can be maintained. In addition, the annular region between the valve receptacle body and the valve support can be used for accommodating the annular filter such that the filter surface for filtering the fluid that, among other things, also flows between the wheel brake and the return collar is advantageously increased.
Additional characteristics, advantages and application options of the invention are described below with reference to several embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an enlarged partial view of an inlet valve with the arrangement according to the invention of the annular piston in the region of the valve closing element.
FIG. 2 is an enlarged cross section through the inlet valve according to FIG. 1 at the location A--A of the valve support.
FIGS. 3 is an enlarged partial view of a first alternative embodiment of the inlet valve of FIG. 1.
FIG. 4 is an enlarged partial view of a second alternative embodiment of the inlet valve of FIG. 1.
FIG. 5 is an enlarged partial view of a third alternative embodiment of the inlet valve of FIG. 1.
FIG. 6 is an enlarged partial view of a fourth alternative embodiment of the inlet valve of FIG. 1.
FIG. 7 is an enlarged partial view of a fifth alternative embodiment of the inlet valve of FIG. 1.
FIG. 8 is an enlarged partial view of a sixth alternative embodiment of the inlet valve of FIG. 1.
FIG. 9 is an enlarged partial view of a seventh alternative embodiment of the inlet valve of FIG. 1.
FIG. 10 is a sectional view in an axial direction of the embodiment illustrated in FIG. 9.
FIG. 11 is an enlarged partial view of an eighth alternative embodiment of the inlet valve of FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 shows one constructive embodiment of the entire inlet valve 1. The inlet valve 1 comprises a valve support 10 that contains the valve closing element 11 and the channel for the main pressure line 2 which originates at the brake pressure transducer 5 and the auxiliary pressure pump 18. The valve support 10 is preferably integrated into a valve receptacle body 9 in the form of a cartridge in the form of, for example, a screw-in cartridge, or a caulked cartridge, or a cartridge with an
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Fischer Klaus-Diether
Kaiser Ralf
Linhoff Paul
Volz Peter
Weis Helmut
Butler Douglas C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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