Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1987-07-22
1988-11-29
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
60553, 60555, 188356, 303 56, 303110, 303115, 303119, B60T 832
Patent
active
047876859
ABSTRACT:
A brake power-controlled brake device for automotive vehicles is provided with a hydraulic master cylinder (11) which is, via a pneumatically actuated pressure modulator (12), connected to at least one wheel cylinder brake circuit I. The pressure modulator (12) comprises a vacuum power generator (20) and a compensating cylinder (18) equipped with a hydraulic piston (16, 16' or 16"), connected to which compensating cylinder is the wheel cylinder brake circuit I. If a brake slip signal occurs, the piston wall (14) of the vacuum power generator (20), which piston wall is normally applied by a vacuum on both sides, is temporarily connected with a higher pressure in the direction in which the volume in the compensating chamber (32) is increased. In addition, an isolating valve (15) is provided which is normally open but is closed when a brake slip signal occurs, and which is inserted in the connecting line (19) from the master cylinder (11) to the compensating chamber (32). According to the invention, the vacuum power generator ( 20) is, at the same time, used as a brake power booster.
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Alfred Teves GmbH
Butler Douglas C.
Raden James B.
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