| US 7,500,931 B2 | ||
| All-wheel drive vehicle | ||
| Thomas Rosemeier, Meckenbeuren (Germany); Ulrich Mair, Friedrichshafen (Germany); Detlef Baasch, Ailingen (Germany); and Christoph Pelchen, Tettnang (Germany) | ||
| Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany) | ||
| Filed on Oct. 17, 2006, as Appl. No. 11/581,902. | ||
| Claims priority of application No. 10 2005 049 709 (DE), filed on Oct. 18, 2005. | ||
| Prior Publication US 2007/0087885 A1, Apr. 19, 2007 | ||
| Int. Cl. F16H 3/72 (2006.01) | ||
| U.S. Cl. 475—5 [477/3] | 7 Claims |
| 1. An all-wheel drive vehicle (1) having
a drive engine (5),
at least two vehicle axles (2, 3), and
a transmission unit (7) for variable distribution of drive torque from the drive engine (5), in a longitudinal direction of the vehicle, between the vehicle's axles (2, 3), the transmission unit (7) having a transmission input shaft (10) and at least two transmission output shafts (11, 12, 13), at least two planetary gearsets (14, 15, 18) and an electric machine (16) arranged between two mutually connected shafts (14A, 15A) of the planetary gearsets (14, 15) for the variable distribution of torque delivered by the transmission input shaft (10) between the at least two transmission output shafts (11, 12, 13) as a function of a torque produced by the electric machine (16), the electric machine (16) actively communicating with the transmission unit (7) in an area of a connection between the two mutually connected shafts (14A, 15A) of the planetary gearsets (14, 15), and the planetary gearsets (14, 15) having different transmission ratios such that, during a direct start, the electric machine (16) is driven by virtue of a speed difference between the two mutually connected shafts (14A, 15A) of the planetary gearsets (14, 15).
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