Power plants – Pressure fluid source and motor – Pulsator
Patent
1977-04-18
1979-01-09
Schwadron, Martin P.
Power plants
Pressure fluid source and motor
Pulsator
60589, 60592, 1374938, 251 83, B60T 1108, F15B 704
Patent
active
041331788
ABSTRACT:
A master cylinder assembly has a low pressure, high volume displacement quick take-up chamber and a high pressure, low volume displacement pressurizing chamber formed by a stepped bore and a stepped piston. A compensation control and blow-off valve unit has a peripheral lip seal type valve providing compensation flow on break release but preventing flow from the quick take-up chamber during brake apply. A normally closed check valve is held open while the master cylinder is in the fully released position to provide communication between both pressurizing chambers and the fluid reservoir. As the pressurizing cup for the high pressure chamber closes its compensation port, the check valve is permitted to close by camming action of a valve pin and a camming surface on the piston. Initial flow is obtained from the quick take-up chamber past the pressurizing cup into the high pressure chamber. At a predetermined pressure level, arranged to be sufficient to take up lining clearance and initially apply the vehicle brakes, the pressure in the quick take-up chamber opens the normally closed check valve so that fluid from the quick take-up chamber then flows to the reservoir without further pressure buildup in that chamber. As the master cylinder is released, compensation fluid can flow past the peripheral compensation valve to both chambers. When the master cylinder is returned to the fully released position, the check valve is forced open by action of the piston cam surface and the valve pin to provide fluid communication between the reservoir and both pressurizing chambers. A fluid flow restrictive orifice is provided in series with the normally closed check valve to prevent a high rate of pressure increase in the quick take-up chamber from being bypassed fully to the fluid reservoir upon a high rate of master cylinder actuation, forcing at least some of the pressure to pass by the cup seal into the high pressure chamber and the brake apply circuit.
REFERENCES:
patent: 2000187 (1935-05-01), Oliver
patent: 2207127 (1940-07-01), La Brie
patent: 2255359 (1941-09-01), Lepersonne
patent: 2317604 (1943-04-01), Hamilton
patent: 2580850 (1952-01-01), Seppmann
patent: 3635028 (1972-01-01), Sherman
patent: 3788352 (1974-01-01), Ane
patent: 3937021 (1976-02-01), Sisco
General Motors Corporation
Hershkovitz Abraham
McGraw D. D.
Schwadron Martin P.
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