Electric drive system

Abstract

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

Claims

1. An electric drive system (10) for an automated vehicle, A first electric machine (20) having a first rotor (24) that can supply torque, A differential (38) having a differential gear (40) that can introduce the torque into the differential (38), A gear unit (58) is provided in addition to the differential (38), and is positioned in relation to the torque flow between the first rotor (24) and the differential gear (40) with respect to the torque flow originating from the first electromachine (20), and is capable of transmitting the torque from the first rotor (24) to the differential gear (40), and can introduce the torque to the differential (38) and the first input shaft (60), an output shaft (68) arranged parallel to the first input shaft (60), at least two gear wheels (72, 74) arranged coaxially with the first input shaft (60), namely the first gear wheel (72) and the second gear wheel (74), and two gear wheels (76, 78) arranged coaxially with the output shaft (68), namely the third gear wheel (76) and the fourth gear wheel (78), via the differential gear (40). A drive housing (84) formed integrally, wherein the first electric machine (20) and the gear unit (58) are each at least partially housed in the drive housing (84), The axle housing (86) in which the differential (38) is housed and Equipped with, The rotation axis (32) of the first rotor (24), the rotation axis (70) of the output shaft (68), and the rotation axis (42) of the differential gear (40) are arranged parallel to each other. The drive housing (84) and the axle housing (86) are directly connected to each other by a first flange joint (88). The first flange surface (F1) of the first flange joint (88) is arranged parallel to the rotation axis (42) of the differential gear (40), The first rotor (24) and the gear wheels (72, 74, 76, 78) of the gear unit (58) are completely located inside the drive housing (84). A first cover (94) and a second cover (96) are provided. The first cover (94) and the drive housing (84) are directly connected to each other by a second flange joint (98). The second cover (96) and the drive housing (84) are directly connected to each other by a third flange joint (104). The second flange surface (F2) of the second flange joint (98) and the third flange surface (F3) of the third flange joint (104) are arranged perpendicular to the rotation axis (42) of the differential gear (40). 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) for cooling and lubricating the gear unit (58) and the differential (38), The axle housing (86) is positioned on the side (S4) opposite to the gear unit (58) and includes a cooling module (160) comprising an electric pump for supplying oil to the first oil chamber (148) and a second oil cooler. An electric drive system (10) for an automated vehicle, characterized by the above.

2. The electric drive system (10) according to claim 1, characterized in that the gear unit (58) has a counter shaft (110) arranged parallel to the first input shaft (60) and parallel to the output shaft (68), and is provided with a first switchable spur gear pair (117) comprising a first gear wheel (72) and a first counter shaft gear wheel (114) arranged coaxially with the counter shaft (110), and is provided with a second switchable spur gear pair (118) comprising a second gear wheel (74) and a second counter shaft gear wheel (116) arranged coaxially with the counter shaft (110).

3. The electric drive system (10) according to claim 2, characterized in that the rotating shaft (112) of the counter shaft (110), the rotating shaft (70) of the output shaft (68), and the rotating shaft (42) of the differential gear (40) are arranged on a first common plane (E1).

4. The electric drive system (10) according to claim 3, wherein the gear unit (58) comprises a first partial gear (128) having a first spur gear pair (117) and a second spur gear pair (118), and a second partial gear (130) positioned in the torque flow and connected downstream of the first partial gear (128) with respect to the torque flow, the second partial gear comprises the output shaft (68) and a planetary gear set (132) arranged coaxially with the output shaft (68).

5. An electric drive system (10) according to claim 1, comprising a second electric machine (26) having a second rotor (30) disposed inside the drive housing (84), wherein the differential gear (40) can be driven from there via the gear unit (58).

6. The first partial gear (128) includes a second input shaft (64) arranged coaxially with 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 wheel (114). 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 wheel (116). The electric drive system (10) according to claim 4, characterized in that

7. The electric drive system (10) according to claim 6, characterized in that the rotation axis (32) of the first rotor (24) and the rotation axis (36) of the second rotor (30) are arranged on a second common plane (E2).

8. The electric drive system (10) according to claim 7, characterized in that the second common plane (E2) is arranged perpendicular to the first common plane (E1).

9. The electric drive system (10) according to claim 1, characterized in that a mechanical oil pump (152) for supplying oil to the second oil chamber (150) is located on the side (S3) of the first cover (94) opposite to the gear unit (58) and is driveable by the gear unit (58).

10. The electric drive system (10) according to claim 9, characterized in that the mechanical oil pump (152) comprises a pump housing (158) and a pump impeller (154) disposed inside the pump housing (158), coaxially arranged with the output shaft (68), and connected to the shaft of the planetary gear set (132) in a torsionally rigid manner.

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

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