| US 7,543,695 B2 | ||
| Hydraulic system for an electro-mechanical transmission and method of providing fluid to transmission components | ||
| James A. Redelman, Indianapolis, Ind. (US); Clifford H. Oehme, Avon, Ind. (US); and James P. Ordo, Avon, Ind. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Jul. 21, 2006, as Appl. No. 11/459,248. | ||
| Prior Publication US 2008/0017472 A1, Jan. 24, 2008 | ||
| Int. Cl. F04B 23/04 (2006.01); B62D 55/08 (2006.01) | ||
| U.S. Cl. 192—221 [180/9.1; 417/426] | 13 Claims |
| 1. A hydraulic system for an electro-mechanical transmission comprising:
an electrically-powered main pump operable for providing fluid to transmission components including a torque-transmitting
mechanism;
a battery-powered auxiliary pump selectively operable, when electric power to said main pump is unavailable, for providing
sufficient fluid pressure to engage said torque-transmitting mechanism to thereby enable rotation of a transmission output
member; and
an output pump mechanically-powered by rotation of said transmission output member for providing fluid to said transmission
components in lieu of said main pump.
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