Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1987-07-06
1988-09-13
Freeh, William L.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
418178, 418133, F04B 4900, F01C 2100
Patent
active
047706120
ABSTRACT:
A steering power-assistance pump of vane type includes a combined flow control and pressure relief valve. When the steering valve of the steering arrangement shuts off the flow of oil, the output of the pump is converted into heat within the pump which accordingly suffers a substantial rise in temperature. The rotor of the pump and the cam ring with which the rotor vanes co-operate are combined with a pressure plate and a wear plate on respective sides of the rotor to form a unit which is displaceable in the axial direction of the pump against the force of a compressible sealing means for sealing off inlet ducts relative to a pressure chamber behind the pressure plate. The unit is thus displaced against the force of the compressible sealing means, as a result of thermally induced deformation of the housing portions of the pump. The wear and pressure plates have coatings of bearing metal on their surfaces which co-operate with the rotor, to provide better anti-friction properties.
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patent: 3695791 (1972-10-01), Brundage
patent: 3752609 (1973-08-01), Niemiec
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patent: 4008002 (1977-02-01), Niemiec
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patent: 4470768 (1984-09-01), Konz
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patent: 4637782 (1987-01-01), Teubler
patent: 4681517 (1987-07-01), Schulz
Freeh William L.
Vickers Systems GmbH
LandOfFree
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