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A drive unit (20) particularly suited for a motor vehicle 1 which is driven by a plurality of axles, which drive unit (20) comprises a primary drive source for solely driving a first driving axle (2), and a secondary drive source which, together with the primary drive source, via a superposition dri

A drive unit (20) particularly suited for a motor vehicle 1 which is driven by a plurality of axles, which drive unit (20) comprises a primary drive source for solely driving a first driving axle (2), and a secondary drive source which, together with the primary drive source, via a superposition drive, serves to drive a second driving axle (3). The drive unit comprises a superposition drive (14) which comprises a first input shaft (17) for establishing a driving connection with a primary driveshaft, a second input shaft (18) and an output shaft (19), and an electric motor (15) with a rotor and a stator constituting the secondary drive source whose one part (rotor, stator) is connected to the second input shaft (18) of the superposition drive (14) and whose other part (stator, rotor) is connected to a further rotating member of the superposition drive (14).

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1. A drive unit (20) comprising:a superposition drive (14) comprising a first input shaft (17) for establishing a drive connection with a primary drive source, a second input shaft (18) and an output shaft (19), an electric motor (15) having a rotor (22) and a stator (23), the electric motor being a

1. A drive unit (20) comprising:a superposition drive (14) comprising a first input shaft (17) for establishing a drive connection with a primary drive source, a second input shaft (18) and an output shaft (19), an electric motor (15) having a rotor (22) and a stator (23), the electric motor being a secondary drive source, one of the rotor or stator being connected to the second input shaft (18) of the superposition drive (14) and the other of the rotor or stator being connected to a further rotating member of the superposition drive (14), and wherein the superposition drive (14) is a planetary drive with a carrier shaft, a sun sear (25), at least one planetary gear (31) and a hollow gear (35), wherein the first input shaft (17) comprises the carrier shaft and rotatably carries the at least one planetary gear (31) which is arranged eccentrically, the second input shaft (18) is connected to the sun gear (25) in a rotationally fast way, and the hollow gear (35) is connected to the output shaft (19) in a rotationally fast way. 2. A drive unit according to claim 1 wherein the rotor (22) is connected to the second input shaft (18) in a rotationally fast way and the stator (23) is connected at least indirectly to the output shaft (19) in a rotationally fast way.3. A drive unit according to claim 1 wherein the second input shaft (18) is a hollow shaft.4. A drive unit according to claim 1 wherein the sun gear (25) or the second input shaft (18) are rotatably supported on the first input shaft (17).5. A drive unit according to claim 1 wherein the first input shaft (17) and either of the hollow gear (35) or the output shaft (19) are directly rotatably supported inside one another.6. A drive unit according to claim 1 comprising a cup-shaped housing part (24) in which there is arranged the stator (23), the housing part (24) being connected to the output shaft (19) in a rotationally fast way, and wherein the output shaft (19) or the hollow gear (35) form a cover part, and a rotationally fast connection (40) is effective between said cover part and the housing part (24).7. A drive unit according to claim 1 wherein the electric motor (15) comprises a housing part (24) accommodating the stator (23), the housing part (24) being provided with a current receiving member (27) which cooperates with a stationary current supplying member (21).8. A drive unit according to claim 1 wherein the rotor (22) of the electric motor (15) is formed by permanent magnets.9. A drive unit (20) comprising:a superposition drive (14) comprising a first input shaft (17) for establishing a drive connection with a primary drive source, a second input shaft (18) and an output shaft (19), an electric motor (15) having a rotor (22) and a stator (23), the electric motor being a secondary drive source, one of the rotor or stator being connected to the second input shaft (18) of the superposition drive (14) and the other of the rotor or stator being connected to a further rotating member of the superposition drive (14); and a cup-shaped housing part (24) in which there is arranged the stator (23), the housing part (24) being connected to the output shaft (19) in a rotationally fast way. 10. A drive unit according to claim 9 wherein the housing part (24) is rotatably supported on the input shaft (17).11. A motor vehicle (1) driven by a plurality of axles comprising:at least one first driving axle (2); at least one second driving axle (34); a primary drive source which, via a first driveline (9), is directly drivingly connected to the first driving axle (2) and which, via a second driveline (10), is controllably drivingly connected to the second driving axle (3); and a drive unit (20) which is arranged in the second driveline (10) and which comprises a superposition drive (14) with a first input shaft (17), a second input shaft (18), an output shaft (19), and an electric motor (15) as a secondary drive source, wherein the first input shaft (17) is drivingly connected to the primary drive source, the second input shaft (18) is drivingly connected to the electric motor (15) and the output shaft (19) is drivingly connected to the second driving axle (3), and wherein, the electric motor, comprising a rotor and a stator is connected in a rotationally fast way to different rotating members of the superposition drive (14) respectively. 12. A motor vehicle according to claim 11 wherein the primary drive source comprises an internal combustion engine and a gearbox with a variable ratio.13. A motor vehicle according to claim 11 wherein the first driving axle (2) is a rear axle having unsteered wheels (4,4′).14. A motor vehicle according to claim 12 wherein the internal combustion engine (7) and the gearbox (8) are associated with a rear axle having unsteered wheels (4,4′).15. A motor vehicle according to claim 11 wherein the first driving axle (2) comprises a first axle differential (12) and the second driving axle (3) comprises a second axle differential (13).16. A motor vehicle according to claim 11 wherein the rotor (22) and the stator (23) are connected to the first input shaft (17) and to the second input shaft (18) of the superposition drive (14) respectively.17. A motor vehicle according to claim 11 wherein the rotor (22) and the stator (23) are connected to one of the input shafts (17, 18) and to the output shaft (19) of the superposition drive, respectively.18. A motor vehicle according to claim 11 wherein the superposition drive (14) is a planetary drive with a carrier shaft, a sun gear (25), at least one planetary gear (31) and a hollow gear (35), wherein the first input shaft (17) comprises the carrier shaft and rotatably carries the at least one planetary gear (31) which is arranged eccentrically, the second input shaft (18) is connected to the sun gear (25) in a rotationally fast way, and the hollow gear (35) is connected to the output shaft (19) in a rotationally fast way.19. A motor vehicle according to claim 18 wherein the second input shaft (18) is a hollow shaft.20. A motor vehicle according to claim 18 wherein the sun gear (25) or the second input shaft (18) are rotatably supported on the first input shaft (17).21. A motor vehicle according to claim 18 wherein the first input shaft (17) and either of the hollow gear (35) or the output shaft (19) are directly rotatably supported inside one another.22. A motor vehicle according to claim 18 comprising a cup-shaped housing part (24) accommodating the stator (23), the housing part (24) being connected to the first input shaft (17) in a rotationally fast way, and at its cover end, the housing part (24) is connected to the carrier shaft (30) in a rotationally fast way.23. A motor vehicle according to claim 18 comprising a cup-shaped housing part (24) accommodating the stator (23), the housing part (24) being connected to the output shaft (19) in a rotationally fast way, and wherein the output shaft (19) or the hollow gear (35) form a cover part and a rotationally fast connection is effective between the cover part and the housing part.24. A motor vehicle according to claim 11 comprising a cup-shaped housing part (24) accommodating the stator (23), the housing part (24) being connected to the first input shaft (17) in a rotationally fast way.25. A motor vehicle according to claim 24 wherein either of the output shaft (19) or the hollow gear (35) form a cover part (37), and a rotational seal (38) is provided between said cover part (37) and the housing part (24).26. A motor vehicle according to claim 11 comprising a cup-shaped housing part (24) accommodating the stator (23), the housing part (24) being connected to the output shaft (19) in a rotationally fast way.27. A motor vehicle according claim 26 wherein the housing part (24) is rotatably supported on the input shaft (17).28. A motor vehicle according to claim 11 wherein the electric motor (15) comprises a housing part (24) accommodating the stator (23), the housing part (24) being provided with a current receiving member (27) which cooperates with a stationary current supplying member (21).29. A motor vehicle according to claim 11 wherein the rotor (22) of the electric motor (15) is formed by permanent magnets.30. A drive system for a motor vehicle having at least one first driving axle (2) and at least one second driving axle (3), the drive comprising:a primary drive source which, via a first driveline (9), is directly drivingly connected to a first driving axle (2) and which, via a second driveline (10) is controllably drivingly connected to the second driving axle (3); and a drive unit (20) which is arranged in the second driveline (10) and which comprises a superposition drive (14) with a first input shaft (17), a second input shaft (18), an output shaft (19), and an electric motor (15) as a secondary drive source, wherein the first input shaft (17) is drivingly connected to the primary drive source, the second input shaft (18) is drivingly connected to the electric motor and the output shaft (19) is drivingly connected to the second axle (3), and wherein, the electric motor includes a rotor and a stator connected in a rotationally fast way to different rotating members of the superposition drive (14), respectively; wherein the electric motor (15) is adapted to be speed controlled or torque controlled as a function of driving condition parameters. 31. A system according to claim 30 wherein, when the vehicle (1) is driven in a straight line without being braked, the electric motor (15) is supplied with current in such a way that its rotor (22) and its stator (23) stand still relative to one another.32. A system according to claim 30 wherein, by driving the electric motor (15), the rotational speed of the output shaft (19) in curves is controlled in such a way that wheels (5, 5′) of the second driving axle (3) roll in a slip-free way.33. A system according to claim 30 wherein, when the vehicle negotiates curves, a rotational speed of the second driving axle (3) is controlled by driving the electric motor as a function of a steering angle of the steerable axle of the motor vehicle.34. A system according to claim 30 wherein, for slip-free driving, a torque of the second driving axle (3) is controlled by supplying the electric motor (15) with current as a function of the speeds of the first driving axle and of the second driving axle.35. A system according to claim 30 wherein, when activating a driving dynamics control system of the motor vehicle, the electric motor (15) is electrically disconnected or controlled.36. A system according to claim 30 wherein, when activating a motor vehicle brake system including an ABS system, the electric motor (15) is electrically disconnected controlled.37. A drive system for a motor vehicle having at least one first driving axle (2) and at least one second driving axle (3), the drive comprising:a primary drive source which, via a first driveline (9), is directly drivingly connected to a first driving axle (2) and which, via a second driveline (10) is controllably drivingly connected to the second driving axle (3); and a drive unit (20) which is arranged in the second driveline (10) and which comprises a superposition drive (14) with a first input shaft (17), a second input shaft (18), an output shaft (19), and an electric motor (15) as a secondary drive source, wherein the first input shaft (17) is drivingly connected to the primary drive source, the second input shaft (18) is drivingly connected to the electric motor and the output shaft (19) is drivingly connected to the second axle (3), and wherein, the electric motor includes a rotor and a stator connected in a rotationally fast way to different rotating members of the superposition drive (14), respectively; wherein the electric motor (15) is supplied with current or electrically disconnected as a function of driving condition parameters. 38. A system according to claim 37 wherein, when the vehicle (1) is driven in a straight line without being braked, the electric motor (15) is supplied with current in such a way that its rotor (22) and its stator (23) stand still relative to one another.39. A system according to claim 37 wherein, by driving the electric motor (15), the rotational speed of the output shaft (19) in curves is controlled in such a way that wheels (5, 5′) of the second driving axle (3) roll in a slip-free way.40. A system according to claim 37 wherein, when the vehicle negotiates curves, a rotational speed of the second driving axle (3) is controlled by driving the electric motor as a function of a steering angle of the steerable axle of the motor vehicle.41. A system according to claim 37 wherein, for slip-free driving, a torque of the second driving axle (3) is controlled by supplying the electric motor (15) with current as a function of the speeds of the first driving axle and of the second driving axle.42. A system according to claim 37 wherein, when activating a driving dynamics control system of the motor vehicle, the electric motor (15) is electrically disconnected or controlled.