Drivetrain

1. A drive train ( 1 ) for an electric truck, said drive train ( 1 ) comprising:

a. a gearbox ( 2 ) comprising a gear box housing ( 3 );

b. an output shaft ( 4 ) extending in an axial direction (x) across a wall ( 5 ) of the gear box housing ( 3 ) and powering a cardan shaft ( 6 ) arranged outside of the gear box housing ( 3 );

c. at least one output gear ( 7 ) arranged inside of the gear box housing ( 3 ) on the output shaft ( 4 );

d. at least a first and a second electric motor ( 8 ) attached to the housing ( 3 ) of the gearbox ( 2 ) forming a team of electric motors ( 9 ), wherein

e. each electric motor ( 8 ) includes a drive shaft ( 10 ) extending parallel to the axial direction (x) and being mechanically interconnected via an input gear ( 11 ) to the at least one output gear ( 7 ) in a continuous manner, wherein

f. the input gears ( 11 ) of the electric motors ( 8 ) are directly coupled to the at least one output gear ( 7 ) forming a single stage gearbox ( 2 );

g. wherein the output gear ( 7 ) is integrally formed with the output shaft ( 4 ) and comprises a disc-shaped gear body ( 12 ) and a first and a second helical gear ring ( 13 ) arranged back to back to each other on the gear body ( 12 ) forming a double helical ring gear; and

h. wherein the housing ( 3 ) of the gearbox ( 2 ) has a front part ( 14 ) and a rear part ( 15 ) which are substantially identical and interconnectable to each other in a separation plane ( 16 ) arranged essentially perpendicular to the axial direction (x).

2. The drive train according to claim 1 , wherein the first and the second electric motor ( 8 ) are arranged on a same side of the housing ( 3 ) of the gear box ( 2 ) forming a pair of electric motors ( 8 ).

3. The drive train according to claim 2 , wherein at least one pair of electrical motors ( 8 ) is arranged mirror symmetrically with respect to a plane perpendicular to the axial direction (x) and/or a plane perpendicular the lateral direction (y).

4. The drive train according to claim 1 , wherein the first and the second electric motor ( 8 ) are arranged on opposite sides of the housing ( 3 ) of the gear box ( 2 ) forming a pair of electric motors ( 8 ).

5. The drive train according to claim 4 , wherein the first and the second electric motor ( 8 ) are arranged coaxial with respect to their drive shafts ( 10 ).

6. The drive train according to claim 1 , wherein the team of electric motors ( 9 ) comprises four electric motors ( 8 ) arranged in two pairs of electric motors ( 8 ).

7. The drive train according to claim 1 , wherein all electric motors ( 8 ) of a team ( 9 ) are operated with the same torque.

8. The drive train according to claim 1 , wherein the ratio between the input gear ( 11 ) and the output gear ( 7 ) is approximately 10:1.

9. The drive train according to claim 1 , wherein the front part ( 14 ) and/or the rear part ( 15 ) comprise at least one mounting flange ( 17 ) configured to attach an electric motor ( 8 ).

10. The drive train according to claim 1 , wherein the wall ( 5 ) of the gear box housing ( 3 ) of the front part ( 14 ) and/or the rear part ( 15 ) is extending essentially perpendicular to the axial direction and cooling means ( 18 ) interconnected to said wall ( 5 ).

11. The drive train according to claim 1 , wherein the housing ( 3 ) includes a length in an axial direction (x) that is less than a length in a lateral direction (y) or a length in a vertical direction (z).

12. A drive train ( 1 ) for an electric truck, said drive train ( 1 ) comprising:

a. a gearbox ( 2 ) comprising a gear box housing ( 3 );

b. an output shaft ( 4 ) extending in an axial direction (x) across a wall ( 5 ) of the gear box housing ( 3 ) and powering a cardan shaft ( 6 ) arranged outside of the gear box housing ( 3 );

c. at least one output gear ( 7 ) arranged inside of the gear box housing ( 3 ) on the output shaft ( 4 );

d. at least a first and a second electric motor ( 8 ) attached to the housing ( 3 ) of the gearbox ( 2 ) forming a team of electric motors ( 9 );

e. wherein each electric motor ( 8 ) includes a drive shaft ( 10 ) extending parallel to the axial direction (x) and being mechanically interconnected via an input gear ( 11 ) to the at least one output gear ( 7 ) in a continuous manner;

f. wherein the input gears ( 11 ) of the electric motors ( 8 ) are directly coupled to the at least one output gear ( 7 ) forming a single stage gearbox ( 2 ); and

g. wherein the housing ( 3 ) of the gearbox ( 2 ) has a front part ( 14 ) and a rear part ( 15 ) and at least one nozzle bridge ( 19 ) extends between the front part ( 14 ) and the rear part ( 15 ) of the gearbox housing ( 3 ), said nozzle bridge ( 19 ) comprises at least one nozzle ( 22 ) for injecting oil into the gear box ( 2 ).