Electric vehicle and driving system for electric vehicle

1. A driving system ( 1 ) for an electric vehicle, the driving system comprising:

a wheel rim rotatable about an axis, the wheel rim defining an interior space radially inside the rim within an axial extent of the rim;

a motor ( 3 ) comprising a first output shaft ( 11 ); and

a gearbox ( 17 ) comprising a second output shaft ( 27 ) drivingly attached to the wheel rim, the first output shaft ( 11 ) being capable of driving the second output shaft ( 27 ) to rotate by engagement of gears of the gearbox ( 17 );

wherein the first output shaft ( 11 ) is hollow, and the second output shaft ( 27 ) extends through the first output shaft ( 11 ) so that the second output shaft ( 27 ) is disposed coaxially with the first output shaft ( 11 ), and wherein the rim ( 35 ) and the gearbox ( 17 ) are positioned on opposite axial sides of the motor ( 3 ), and the motor ( 3 ) is at least partially positioned within the interior space defined by the rim ( 35 ).

2. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein the motor ( 3 ) further comprises a motor housing ( 5 ), a stator ( 7 ) disposed fixedly within the motor housing ( 5 ), and a rotor ( 9 ) disposed rotatably within a central space defined by the stator ( 7 ), wherein the first output shaft ( 11 ) is fixed onto the rotor ( 9 ) and supported rotatably by the motor housing ( 5 ) to be rotatable with the rotor ( 9 ).

3. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein the gearbox ( 17 ) comprises a gearbox housing ( 19 ), at least two pair of gears ( 21 a , 21 b , 23 a , 23 b ) engaged with each other and at least one transmission shaft ( 25 ) supported rotatably by the gearbox housing ( 19 ), wherein the first output shaft ( 11 ) extends into the gearbox housing ( 19 ) so that a gear ( 21 a ) having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft ( 11 ), a gear ( 23 b ) having a larger diameter of a last pair of gears of the at least two pair of gears is fixed onto the second output shaft ( 27 ) supported rotatably, and the other gears of the at least two pair of gears are fixed onto the at least one transmission shaft ( 25 ).

4. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein the motor ( 3 ) comprises a motor housing ( 5 ) having a first main body ( 5 a ) and a first end cover ( 5 b ) attached to the first main body ( 5 a ), the gearbox ( 17 ) comprises a gearbox housing ( 19 ) having a second main body ( 19 a ) and a second end cover ( 19 b ) attached to the second main body ( 19 a ), and the first main body ( 5 a ) of the motor housing ( 5 ) and the second main body ( 19 a ) of the gearbox housing ( 19 ) are formed into a unitary unit or piece.

5. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein the second output shaft ( 27 ) is attached to the wheel rim ( 35 ) by means of an adaptor ( 39 ).

6. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein the wheel rim ( 35 ) is designed so that a majority of the motor ( 3 ) is positioned within the interior space defined by the wheel rim ( 35 ).

7. The driving system ( 1 ) for the electric vehicle according to claim 1 , wherein an attachment point ( 43 ) for attaching the driving system ( 1 ) to a frame of the electric vehicle is formed on the gearbox ( 17 ).

8. An electric vehicle comprising a driving system ( 1 ) according to claim 1 .

9. The electric vehicle according to claim 8 , wherein the electric vehicle is an electric motorcycle.

10. The electric vehicle according to claim 8 , wherein the electric vehicle is an electric car.

11. The electric vehicle according to claim 8 , wherein the motor ( 3 ) further comprises a motor housing ( 5 ), a stator ( 7 ) disposed fixedly within the motor housing ( 5 ), and a rotor ( 9 ) disposed rotatably within a central space defined by the stator ( 7 ), wherein the first output shaft ( 11 ) is fixed onto the rotor ( 9 ) and supported rotatably by the motor housing ( 5 ) to be rotatable with the rotor ( 9 ).

12. The electric vehicle according to claim 8 , wherein the gearbox ( 17 ) comprises a gearbox housing ( 19 ), at least two pair of gears ( 21 a , 21 b , 23 a , 23 b ) engaged with each other and at least one transmission shaft ( 25 ) supported rotatably by the gearbox housing ( 19 ), wherein the first output shaft ( 11 ) extends into the gearbox housing ( 19 ) so that a gear ( 21 a ) having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft ( 11 ), a gear ( 23 b ) having a larger diameter of a last pair of gears of the at least two pair of gears is fixed onto the second output shaft ( 27 ) supported rotatably, and the other gears of the at least two pair of gears are fixed onto the at least one transmission shaft ( 25 ).

13. The electric vehicle according to claim 8 , wherein the motor ( 3 ) comprises a motor housing ( 5 ) having a first main body ( 5 a ) and a first end cover ( 5 b ) attached to the first main body ( 5 a ), the gearbox ( 17 ) comprises a gearbox housing ( 19 ) having a second main body ( 19 a ) and a second end cover ( 19 b ) attached to the second main body ( 19 a ), and the first main body ( 5 a ) of the motor housing ( 5 ) and the second main body ( 19 a ) of the gearbox housing ( 19 ) are formed into a unitary unit or piece.

14. The electric vehicle according to claim 8 , wherein the second output shaft ( 27 ) is attached to the wheel rim ( 35 ) by means of an adaptor ( 39 ).

15. The electric vehicle according to claim 14 , wherein the wheel rim ( 35 ) is designed so that a majority of the motor ( 3 ) is positioned within the interior space defined by the wheel rim ( 35 ).

16. The electric vehicle according to claim 8 , further comprising a frame, wherein the driving system is attached to the frame at an attachment point ( 43 ) formed on the gearbox ( 17 ).

17. The electric vehicle according to claim 8 , further comprising a wheel, wherein the wheel includes the wheel rim and a tire.

18. The driving system ( 1 ) for the electric vehicle according to claim 1 , further comprising a wheel, wherein the wheel includes the wheel rim and a tire.