Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-04-12
1990-06-12
Kashnikow, Andres
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 4, 188357, 605471, 92 50, B60T 844, B60T 1300, F01B 1900
Patent
active
049327275
ABSTRACT:
In an anti-lock automotive vehicle brake system comprising a vacuum brake power booster, a considerable reduction of manufacturing and assembling costs is obtained while the system's reliability in operation is simultaneously augmented by the incorporation into this brake system of a second movable wall arranged within the vacuum brake power booster to which a controllable pressure differential may be applied. The wall isolates two pneumatic working chambers and, in the case of slip control, is movable in a direction opposite to the actuating direction of the master brake cylinder by two compensating cylinders which are connected with the master brake cylinder pressure chambers. A hydraulic chamber which is normally in communication with an unpressurized pressure-fluid supply reservoir is sealed from the reservoir by a retention valve during slip control to hydraulically prevent brake petal induced pressure from being applied to the master cylinder.
REFERENCES:
patent: 3482485 (1969-12-01), Abbott
patent: 3559532 (1971-02-01), MacDuff
patent: 4576004 (1986-03-01), Bach
patent: 4828337 (1989-05-01), Wagner et al.
Schiel Lothar
Wagner Wilfried
Alfred Teves GmbH
Kashnikow Andres
Newholm Timothy
Seitter Robert P.
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