Oil pump assembly

Details Oil pump assembly Oil pump assembly

2011-05-17

2011-05-17

Freay, Charles G (Department: 3746)

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

C417S440000, C417S304000, C123S1960CP

Reexamination Certificate

active

07942645

ABSTRACT:
An oil pump assembly includes a plurality of pump chambers constituting a plurality of oil pumps, respectively, a plurality of rotors are fitted into the pump chambers, respectively, with a single driving shaft carrying the plurality of rotors to form a single body. Oil pumped up from an oil pan is supplied under pressure to different associated destinations with the relief valves being arranged compactly to reduce the size of the oil pump assembly. Oil pumps are provided with respective relief valves provided to pass oil discharged from the corresponding pump chambers therethrough and the axes of the relief valves are arranged parallel to the driving shaft. A driving shaft is provided on which a plurality of the inner rotors are carried concentrically and integrally. The rotors are connected to the driving shaft and changed depending on discharge oil pressures, thereby preventing the driving shaft from increasing its diameter.

REFERENCES:
patent: 2724335 (1955-11-01), Eames
patent: 3244111 (1966-04-01), Shelhart
patent: 4971528 (1990-11-01), Hodgkins et al.
patent: 6830439 (2004-12-01), Stephens
patent: 6837209 (2005-01-01), Hori et al.
patent: 2005/0180870 (2005-08-01), Stanley et al.
patent: 7-102930 (1995-04-01), None
patent: 2000-199413 (2000-07-01), None
patent: 2000-220430 (2000-08-01), None

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