Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-07-08
1993-03-02
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303DIG2, 303 841, 1375395, F15B 13042, B60T 732, B60T 846
Patent
active
051903628
ABSTRACT:
A pressure limiting valve has a valve closing member (ball), which is subjected to a hydraulic opening force and is indirectly subjected to a closing force generated by a compression spring which avoids hysteresis that impairs the switching behavior of the pressure limiting valve. A tappet, which passes through a sealing ring and is exposed to a control pressure, is also capable of acting in a closing manner upon the pressure limiting valve. When there is no operative control pressure, the tappet is pushed back by the opening of the pressure limiting valve and is retained in this position by frictional forces brought about by a sealing ring. The switching plays of the pressure limiting valve are free of frictional forces. The pressure limiting valve is suitable for use in hydraulic motor vehicle brake systems.
REFERENCES:
patent: 2470372 (1949-05-01), Roth
patent: 3175582 (1965-03-01), London
patent: 3236256 (1966-02-01), Valentine
patent: 4123118 (1978-10-01), Sato
patent: 4783125 (1988-11-01), Belart et al.
Mueller Klaus
Schaefer Ernst-Dieter
Ballato Josie A.
Butler Douglas C.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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