Electric drive system for a motor vehicle, in particular for an automobile

Patent metadata

Field	Value
Publication number	US-12584546-B2
Application number	US-202218710808-A
Country	US
Kind code	B2
Filing date	Nov 16, 2022
Priority date	Nov 18, 2021
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

The invention relates to an electric drive system ( 10 ) for a motor vehicle, comprising an electric machine ( 20 ) with a rotor ( 24 ). A differential ( 38 ) with a differential gear ( 40 ) is provided. A gear unit ( 58 ) is provided, which is arranged in the torque flow between the rotor ( 24 ) and the differential gear ( 40 ) with respect to a torque flow emanating from the electric machines ( 20 ), and has a first input shaft ( 60 ) an output shaft ( 68 ) arranged parallel and axially offset to the first input shaft ( 60 ) and at least two gear wheels ( 72, 74 ) arranged coaxially to the first input shaft ( 60 ), namely a first gear wheel ( 72 ) and a second gear wheel ( 74 ), and two gear wheels ( 76, 78 ) arranged coaxially to the output shaft ( 68 ), namely a third gear wheel ( 76 ) and a fourth gear wheel ( 78 ).

First claim

The invention claimed is:

1 . Electric drive system ( 10 ) for a motor vehicle, showing:
a first electric machine ( 20 ) with a first rotor ( 24 ), via which torques can be provided by the first electric machine ( 20 ), a differential ( 38 ) with a differential gear ( 40 ), via which the torques can be introduced into the differential ( 38 ), a gear unit ( 58 ) which is provided in addition to the differential ( 38 ) and which is arranged in the torque flow between the first rotor ( 24 ) and the differential gear ( 40 ) with respect to a torque flow emanating from the first electric machine ( 20 ), via which the torques can be transmitted from the first rotor ( 24 ) to the differential gear ( 40 ) and can be introduced into the differential ( 38 ) via the differential gear ( 40 ), and a first input shaft ( 60 ), an output shaft ( 68 ) arranged parallel and axially offset to the first input shaft ( 60 ) and at least two gear wheels ( 72 , 74 ) arranged coaxially to the first input shaft, ( 60 ), namely a first gear wheel ( 72 ) and a second gear wheel ( 74 ), and two gear wheels ( 76 , 78 ) arranged coaxially to the output shaft ( 68 ), namely a third gear wheel ( 76 ) and a fourth gear wheel ( 78 ), a drive housing ( 84 ) formed in one piece in which the first electric machine ( 20 ) and the gear unit ( 58 ) are each at least partially accommodated, an axle housing ( 86 ) in which the differential ( 38 ) is accommodated, wherein an axis of rotation ( 32 ) of the first rotor ( 24 ), an axis of rotation ( 70 ) of the output shaft ( 68 ) and an axis of rotation ( 42 ) of the differential gear ( 40 ) a arranged parallel and axially offset to one another, the drive housing ( 84 ) the axle housing ( 86 ) are directly connected to one another by means of a first flange joint ( 88 ), a first flange, face surface (F 1 ) of the first flange joint ( 88 ) is arranged parallel to the axis of rotation ( 42 ) of the differential gear ( 40 ), characterized in that: the first rotor ( 24 ) and the gear wheels ( 72 , 74 , 76 , 78 ) of the gear unit ( 58 ) are arranged completely within the drive housing ( 84 ), a first cover ( 94 ) a second cover ( 96 ) are provided, the first cover ( 94 ) and the drive housing ( 84 ) are directly connected to one another by means of a second flange joint ( 98 ), the second cover ( 96 ) and the drive housing ( 84 ) are directly connected to each other by means of a third flange joint ( 104 ), and a second flange face surface (F 2 ) of the second flange joint ( 98 ) and a third flange face surface (F 3 ) of the third flange joint ( 104 ) are arranged perpendicular to the axis of rotation ( 42 ) of the differential gear ( 40 ), characterized in that: the gear unit ( 58 ) has a countershaft ( 110 ) arranged parallel and axially offset to the first input shaft ( 60 ) and parallel and axially offset to the output shaft ( 68 ), wherein a first switchable spur gear pair ( 117 ) is provided, which comprises the first gear wheel ( 72 ) and a first countershaft gear wheel ( 114 ) arranged coaxially to the countershaft ( 110 ), and wherein a second switchable spur gear pair ( 118 ) is provided, which comprises the second gear wheel ( 74 ) and a second countershaft gear wheel ( 116 ) arranged coaxially to the countershaft ( 110 ).

2 . Electric drive system ( 10 ) according to claim 1 ,
characterized in that an axis of rotation ( 112 ) of the countershaft ( 110 ), the axis of rotation ( 70 ) of the output shaft ( 68 ) and the axis of rotation ( 42 ) of the differential gear ( 40 ) are arranged in a first common plane (E 1 ).

3 . Electric drive system ( 10 ) according to claim 2 ,
characterized in that the gear unit ( 58 ) has a first partial gear ( 128 ) comprising the first switchable spur gear pair ( 117 ) and the second switchable spur gear pair ( 118 ) and a second partial gear ( 130 ) arranged in the torque flow and connected downstream of the first partial gear ( 128 ) with respect to the torque flow, which second partial gear comprises the output shaft ( 68 ) and a planetary gear set ( 132 ) arranged coaxially with the output shaft ( 68 ).

4 . Electric drive system ( 10 ) according to claim 3 ,
characterized in that the planetary gear set ( 132 ) is arranged axially overlapping with the first rotor ( 24 ).

5 . Electric drive system ( 10 ) according to claim 3 ,
characterized by a second electric machine ( 26 ) with a second rotor ( 30 ) arranged inside the drive housing ( 84 ), from which the differential gear ( 40 ) can be driven via the gear unit ( 58 ).

6 . Electric drive system ( 10 ) according to claim 5 ,
characterized in that: the first partial gear ( 128 ) comprises a second input shaft ( 64 ) arranged coaxially to the second rotor ( 30 ), a third switchable spur gear pair ( 120 ) is provided, comprising a fifth gear ( 80 ) arranged coaxially with the second input shaft ( 64 ) and the first countershaft gear ( 114 ), and a fourth switchable spur gear pair ( 122 ) is provided, comprising a sixth gear ( 82 ) arranged coaxially with the second input shaft ( 64 ) and the second countershaft gear ( 116 ).

7 . Electric drive system ( 10 ) according to claim 6 ,
characterized in that the axis of rotation ( 32 ) of the first rotor ( 24 ) and an axis of rotation ( 36 ) of the second rotor ( 30 ) are arranged in a second common plane (E 2 ).

8 . Electric drive system ( 10 ) according to claim 6 ,
characterized in that the second common plane (E 2 ) is arranged perpendicular to the first common plane (E 1 ).

9 . Electric drive system ( 10 ) according to claim 6 ,
characterized by a first oil chamber ( 148 ) formed for cooling and lubricating the first rotor ( 24 ), and a second oil chamber ( 150 ) formed separately from the first oil chamber ( 148 ) and formed for cooling and lubricating the gear unit ( 58 ) and the differential ( 38 ).

10 . Electric drive system ( 10 ) according to claim 9 ,
characterized by a mechanical oil pump ( 152 ), which can be driven by the gear unit ( 58 ) and is arranged on a side (S 3 ) of the first cover ( 94 ) facing away from the gear unit ( 58 ), for supplying the second oil chamber ( 150 ) with oil.

11 . Electric drive system ( 10 ) according to claim 10 ,
characterized in that the mechanical oil pump ( 152 ) has a pump housing ( 158 ) and a pump impeller ( 154 ) which is arranged inside the pump housing ( 158 ), is arranged coaxially with the output shaft ( 68 ) and is connected in a torsionally rigid manner to a shaft of the planetary gear set ( 132 ).

12 . Electric drive system ( 10 ) according to claim 11 ,
characterized in that a first oil cooler for cooling the oil is arranged inside the pump housing ( 158 ).

13 . Electric drive system ( 10 ) according to claim 9 ,
characterized by a cooling module ( 160 ) arranged on a side (S 4 ) of the axle housing ( 86 ) facing away from the gear unit ( 48 ) and comprising an electric pump and a second oil cooler for supplying the first oil chamber ( 148 ) with oil.

Assignees

• Daimler Truck AG

Inventors

• Strölin Marc
• Luckmann Jens
• Schneider Martin

Classifications

• F16H2200/0034

  the gear ratios comprising two forward speeds · CPC title

• F16H2200/0021

  specially adapted for electric vehicles · CPC title

• F16H2057/02052

  Axle units; Transfer casings for four wheel drive · CPC title

• F16H2057/02034

  Gearboxes combined or connected with electric machines · CPC title

• F16H57/0494

  with variable gear ratio or for reversing rotary motion · CPC title