Power plants – Pressure fluid source and motor – Having apparatus control by timer or delay means
Patent
1985-11-20
1988-09-13
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Having apparatus control by timer or delay means
60414, 60418, 60582, F16D 3102
Patent
active
047699892
ABSTRACT:
A device for controlling the pressure in an auxiliary-pressure supply system of a hydraulic brake unit for automotive vehicles, which device comprises a diaphragm-type or bladder-type accumulator equipped with a hydraulic and electric switching arrangement by way of which the hydraulic pressure in the pressure accumulator can be reduced to a predetermined value after the engine of the vehicle has been turned off. An electromagnetic multidirectional control valve is used to divert hydraulic fluid back to a reservoir through a pressure-limiting valve connected downstream thereof. After the engine of the vehicle has been turned off, the multidirectional control valve remains open until the accumulator pressure has decreased to at least the gas inflation pressure of the accumulator. The invention reduces permeation of gas molecules through the diaphragm of the accumulator into the hydraulic fluid and thus effects a longer useful life of the pressure accumulator.
REFERENCES:
patent: 3350142 (1967-10-01), Schuman
patent: 3971215 (1976-07-01), Baron
patent: 3991570 (1976-11-01), Keller
patent: 4100739 (1978-07-01), Shaffer
patent: 4369625 (1983-01-01), Izumi
patent: 4402554 (1983-09-01), Belart
"Industrial Hydraulic Technology". Bulletin 0221-B1. Parker Fluidpower. Jan., 1980. pp. 8-6, 10-5, 10-6.
Blum Klaus-Dieter
Klein Hans-Christof
Ostwald Fritz
Alfred Teves GmbH
Hershkovitz Abraham
Raden James B.
Seitter Robert P.
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