Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1977-04-05
1978-02-07
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 61, B60T 802
Patent
active
040723658
ABSTRACT:
A vacuum powered modulator for an adaptive braking system includes a housing that defines a chamber. The housing also includes an inlet that communicates with a conventional master cylinder and an outlet that communicates with a brake wheel cylinder and a valve for regulating the communication between the master cylinder and the wheel cylinder. A pressure responsive member is movably disposed within the housing chamber to define a first cavity and a second cavity. The first cavity communicates with a vacuum source and a passage through the housing communicates the second cavity with the first cavity so that the second cavity is also in communication with the vacuum source in a normal condition. When a skidding condition is imminent, a sensor is actuatable to close communication between the first and second cavity via the passage and to vent the second cavity to atmosphere so that the pressure responsive member moves to cooperate with the valve to reduce the communication to the wheel cylinder. A seal between the pressure responsive member and a portion of the housing isolates the first cavity from the second cavity and the housing passage extends through the housing portion to communicate with the first cavity regardless of the position of the pressure responsive member.
REFERENCES:
patent: 3790224 (1974-02-01), Ritsema
patent: 3790228 (1974-02-01), Adahan
patent: 3837711 (1974-09-01), Van House et al.
patent: 3840279 (1974-10-01), Pauwels
Decker Ken C.
Reger Duane A.
Schoenle Paul David
The Bendix Corporation
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