Power plants – Pressure fluid source and motor – Pulsator
Patent
1976-06-22
1977-05-24
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Pulsator
91369R, 91391R, F15B 708
Patent
active
040247139
ABSTRACT:
A dual source power brake booster assembly includes an air-vacuum operated booster section and a hydraulic pressure operated booster section disposed in series. The assembly is so arranged that the vacuum booster section is initially actuated to obtain a booster brake operation when the vehicle operator depresses a brake pedal, and the hydraulic booster section is actuated so as to continue the booster brake operation in response to an increased depression upon the brake pedal after the vacuum booster section reaches its limit or run-out condition. The hydraulic booster section has a power piston to thereby define two fluid chambers, the power piston having pressure receiving areas, respectively subjected to the hydraulic pressures within both chambers, which are the same so that so long as the hydraulic booster section is in its non-operating or brake released condition, a hydraulic force, which normally biases or actuates the power piston, will not be generated. Both of the booster sections may also have reaction means, respectively, whereby the operator can sense a predetermined amount of the brake booster force.
REFERENCES:
patent: 3033173 (1962-05-01), Bauman
patent: 3935709 (1976-02-01), Mathues
Aisin Seiki Kabushiki Kaisha
Geoghegan Edgar W.
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