Variable displacement pump

Details Variable displacement pump Variable displacement pump

1993-08-17

1994-10-18

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Expansible chamber pump distributor operation modified

417505, 137909, 137514, F04B 3908

Patent

active

053562690

ABSTRACT:
A variable displacement pump (3) comprises a piston (4) reciprocable within a cylinder (2), a displaceable inlet valve (5) adapted to control admission of lower pressure hydraulic fluid (9) to the swept volume area (10) of the piston (4) and cylinder (2), a displaceable outlet valve (7) adapted to control delivery of higher pressure fluid (9) from the swept volume area (10), and means (13, 13A, 26-28, 29-44) to control the position of the inlet valve (5) so as to control the volume of fluid (9) delivered by the pump (3) in accordance with demand.

REFERENCES:
patent: 2667237 (1954-01-01), Rabinow
patent: 3098502 (1963-07-01), Deve
patent: 3459363 (1969-08-01), Miller
patent: 4114125 (1978-09-01), Komatsu
patent: 4493615 (1985-01-01), Stangroom
patent: 4742998 (1988-05-01), Schubert
patent: 4749004 (1988-06-01), Peash
patent: 4840112 (1989-06-01), Bhadra et al.
Fluid Power International No. 30, Dec. 1965, London GB p. 414 "A pump with valve lifters to control delivery".
Business Week Dec. 18, 1948 Magnetized Iron-Oil Mines in New Jobs pp. 48-50.
Journal of Applied Physics Dec. 1949 Induced Fibration of Suspensions pp. 1137-1140.

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