Power plants – Pressure fluid source and motor – Pulsator
Patent
1976-11-29
1978-05-02
Schwadron, Martin P.
Power plants
Pressure fluid source and motor
Pulsator
60574, 60588, 60592, B60T 1120
Patent
active
040867706
ABSTRACT:
A master cylinder of the dual pressurizing chamber type for pressurizing brake fluid in separate brake actuating circuits has the primary piston reciprocably mounted in a stepped bore so that the piston rear land moves within a larger bore section than does the piston front land. The secondary piston moves in the same bore section as does the primary piston front land, and has a pair of spaced lands with oppositely facing lip seals. The front land of the primary piston is also provided with a lip seal. These seals operate to permit the build-up of pressure in the pressurizing chambers located on either side of the secondary piston, while permitting fluid to flow past the seals into the pressurizing chambers when the chambers adjacent the pressurizing chambers are producing a greater pressure than that being produced in the pressurizing chambers. In order to provide for quick takeup, brake fluid under relatively low pressure is moved by high volume displacement in the variable volume chamber between the primary piston lands. This pressure is transmitted past the primary piston front land lip seal into the primary pressurizing chamber. It is also transmitted by appropriate passages to a constant volume chamber between the secondary pressurizing piston lands and therefore past the lip seals, and particularly the lip seal on the forward end of the secondary pressurizing piston, to the pressurizing chambers. The pistons and their forward lip seals are so positioned relative to the pressurizing chamber compensation ports that a predetermined amount of movement of the pistons is required for those lips to close the compensation ports and permit pressure to begin to be generated in the brake circuit pressurizing chambers. During this interval of initial movement, the primary piston, and particularly its larger land, causes a relatively large volume of fluid to be moved at a relatively low pressure. An arrangement is provided to vent the large volume, low pressure chamber and the passages associated therewith to the master cylinder reservoir upon a predetermined build-up in pressure in the primary brake circuit pressurizing chamber, thus obviating the need to move fluid by the larger primary piston land once the quick take-up action has been completed.
REFERENCES:
patent: 2036342 (1936-04-01), Loweke
patent: 2166742 (1939-07-01), Lambert
patent: 2317604 (1943-04-01), Hamilton
patent: 2347349 (1944-04-01), Humphrey
patent: 2739448 (1956-03-01), Troy
patent: 3140587 (1964-07-01), Stelzer
patent: 3143860 (1964-08-01), Stelzer
patent: 3191384 (1965-06-01), Krusemark
patent: 3214913 (1965-11-01), Hayman
patent: 4028891 (1977-06-01), Belart
General Motors Corporation
Hershkovitz Abraham
McGraw D. D.
Schwadron Martin P.
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