Dual oil supply pump

Details Dual oil supply pump Dual oil supply pump

2007-11-06

2007-11-06

Stashick, Anthony D. (Department: 3746)

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

C123S1960CP, C417S307000, C417S372000

Reexamination Certificate

active

10781430

ABSTRACT:
An automotive engine oil pump assembly having first and second pump mechanisms contained within a common housing. A shaft rotatably supported in the housing drives the pump mechanisms in a conventional manner. The pump mechanisms are offset in phase to reduce flow pulsations through the housing and limit pump noise and vibration. The first pump mechanism communicates with a common inlet and first outlet of the housing. The second pump mechanism communicates with the common inlet and second outlet of the housing. A common reservoir connected to inlets of the first and second oil pump mechanisms provides a supplemental oil source to balance oil pressures at the pump inlets to prevent pump cavitation and further reduce pump noise and vibration.

REFERENCES:
patent: 4538966 (1985-09-01), Nikaido
patent: 5901536 (1999-05-01), Kallevig
patent: 6082321 (2000-07-01), Kopec
patent: 6601557 (2003-08-01), Hayman et al.
patent: 6810845 (2004-11-01), Plenzler et al.
patent: 6955045 (2005-10-01), Evans

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