On-demand hydraulic pump for a transmission and method of...

Details On-demand hydraulic pump for a transmission and method of... On-demand hydraulic pump for a transmission and method of...

2008-04-01

2011-10-25

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S486000

Reexamination Certificate

active

08042331

ABSTRACT:
A fixed displacement binary pump is provided for a powertrain on a vehicle. A hydraulic system is operatively connected with first and second discharge ports of the pump and is operable to alternately permit fluid flow through both discharge ports (i.e., full displacement or volumetric output of the pump) or permit flow through only the first discharge port (i.e., partial displacement or volumetric output of the pump). The pump may be packaged in a front support of the transmission. An auxiliary pump may be provided that is operable to supplement the output of the binary pump or to be used when the binary pump is off. A method of operating the binary pump and auxiliary pump is provided.

REFERENCES:
patent: 3994353 (1976-11-01), Greene
patent: 6478549 (2002-11-01), Aden et al.
patent: 6641372 (2003-11-01), Davison et al.
patent: 6669598 (2003-12-01), Berger et al.
patent: 7263978 (2007-09-01), York et al.

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