Hydraulic motor system

Details Hydraulic motor system Hydraulic motor system

1996-03-13

1997-11-18

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60426, 60435, 60483, 91517, 91518, F16D 3102, F15B 1100

Patent

active

056875681

ABSTRACT:
A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As a consequence the hydraulic fluid acts upon a motor system having an effective combined displacement for producing a predetermined shaft rotation rate at the volumetric flow rate which caused the pressure condition. The invention is disclosed as having particular utility for driving a cooling fan for an automotive engine.

REFERENCES:
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patent: 3435616 (1969-04-01), Waldorff
patent: 3757524 (1973-09-01), Poyner et al.
patent: 4098083 (1978-07-01), Carman
patent: 4179888 (1979-12-01), Goscenski, Jr.
patent: 4711090 (1987-12-01), Hartiala et al.
patent: 4799851 (1989-01-01), Swanson
patent: 5199525 (1993-04-01), Schueler
patent: 5347812 (1994-09-01), Nilsson et al.
patent: 5535845 (1996-07-01), Busghur
The Gerotor-information packet describing a positive displacement pumping unit consisting of an inner and an outer rotor, 6 pgs.
Research Disclosure, "Hydraulic Powered Steering & Cooling System With Energy Savings Circuit", No. 369, Jul. 1994, Great Britain.

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