Vehicular brake holding system

Details Vehicular brake holding system Vehicular brake holding system

1988-07-21

1990-06-05

Braun, Leslie A.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0049, 192 123, B60K 4120, B60K 4128

Patent

active

049306073

ABSTRACT:
A brake booster for holding the braking action even if the brake pedal is released. The booster has a low pressure chamber and a variable pressure chamber with a diaphragm therebetween for moving the output shaft to the brake cylinder. A valve mechanism mechanically controlled by the brake pedal switches a communication passage between the low and variable pressure chambers and an atmospheric pressure passage from the variable pressure chamber to the exterior. A first solenoid valve can close the communication passage between the low and variable pressure chambers irrespective of the brake pedal position so as to hold the braking. A second solenoid valve can control a passage between the variable pressure chamber and the low pressure source so that the braking release can be gently effected.

REFERENCES:
patent: 2669329 (1954-02-01), Price
patent: 2978080 (1961-04-01), Beatty
patent: 4759255 (1988-07-01), Shimamura

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