Power plants – Pressure fluid source and motor – Pulsator
Patent
1976-04-09
1978-09-05
Schwadron, Martin P.
Power plants
Pressure fluid source and motor
Pulsator
60550, 60568, 60593, B60T 1312
Patent
active
041109856
ABSTRACT:
A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section and a hydraulic booster section in series, and a master cylinder unit in series with the booster sections. During normal operation the vehicle operator obtains boosted brake actuating pressures from the master cylinder by operation of the hydraulic booster section throughout the normal stroke of both booster sections without operating the vacuum booster section. If additional brake actuating pressure is required after the hydraulic booster has reached its run-out condition, the master cylinder is actuated normally through mechanical force transmitting elements which are parts of the booster sections. If there is no hydraulic pressure available for hydraulic booster operation, the control valves of the booster sections move from the first range of operation which normally controls the hydraulic booster section to a second range of operation which actuates the vacuum booster section. If additional master cylinder output pressure is required when the vacuum booster section has reached its run-out condition, the master cylinder is actuated manually as before. A hydraulic pressure actuated blocking mechanism prevents control valve movement to actuate the vacuum booster section when the hydraulic booster section is normally operating.
REFERENCES:
patent: 3540219 (1970-11-01), Huruta
patent: 3618321 (1971-11-01), Moran
patent: 3685289 (1972-08-01), Kobashi
patent: 3813992 (1974-06-01), Brown
patent: 3877228 (1975-04-01), Shellhouse
patent: 3935709 (1976-02-01), Mathues
patent: 4007664 (1977-02-01), Popp
Gordon Ralph A.
Mathues Thomas P.
Parker Donald L.
General Motors Corporation
Hershkovitz Abraham
McGraw D. D.
Schwadron Martin P.
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