Integrated motor and axle apparatus and method

1. An apparatus, comprising:

a housing having a first end and a second end, the housing including a first end cap at the first end thereof and a second end cap at the second end thereof;

an oscillation bearing housed within the second end cap;

a hollow rotor shaft extending through the housing from the first end of the housing to the second end of the housing, the hollow rotor shaft having a first shaft end having an interior spline surface, and a second shaft end;

wherein the interior spline surface of the hollow rotor shaft is configured to receive a splined end of an internal rear drive shaft and a splined end of a front drive shaft;

a first bearing mounted in the first end cap and supporting the first shaft end of the hollow rotor shaft;

a second bearing mounted in the second end cap and supporting the second shaft end of the hollow rotor shaft; and

a rotor and a stator within the housing, wherein at least one of the first end cap or the second end cap is formed with a mounting bracket for attaching the apparatus to a frame of a vehicle.

2. The apparatus of claim 1 , wherein:

the splined end of the internal rear drive shaft is a crowned splined end; and

the splined end of the front drive shaft is a straight splined end.

3. The apparatus of claim 1 , wherein the second bearing is a cylindrical roller bearing.

4. The apparatus of claim 1 , further including stator end windings within the second end cap.

5. The apparatus of claim 4 , wherein the stator end windings surround the oscillation bearing.

6. The apparatus of claim 1 , wherein:

the splined end of the internal rear drive shaft is a crowned splined end; and

the splined end of the front drive shaft is a crowned splined end.

7. A system, comprising:

an electric motor, the electric motor including:

a housing having a first end and a second end;

a hollow rotor shaft extending through the housing from the first end to the second end of the housing, the hollow rotor shaft having a first shaft end having an interior spline surface, and a second shaft end; and

a rear drive shaft received within the hollow rotor shaft, the rear drive shaft having a first splined end mating with the interior spline surface of the hollow rotor shaft and a second splined end opposite the first splined end; and

an axle coupled to the electric motor, the axle including an axle input shaft having an internal splined surface receiving the second splined end of the rear drive shaft.

8. The system of claim 7 , wherein the electric motor is mounted to a frame of a vehicle.

9. The system of claim 8 , wherein:

the axle is a rear axle of the vehicle; and

the electric motor is mounted to the frame of the vehicle intermediate the rear axle and an operator cabin of the vehicle.

10. The system of claim 8 , wherein the housing of the electric motor includes a first end cap at the first end thereof and a second end cap at the second end thereof.

11. The system of claim 10 , wherein:

at least one of the end caps includes a mounting bracket; and

the electric motor is mounted to the frame of the vehicle via the mounting bracket.

12. The system of claim 10 , further comprising an oscillation bearing housed within the second end cap.

13. The system of claim 12 , further including stator end windings within the second end cap.

14. The system of claim 13 , wherein the stator end windings surround the oscillation bearing.

15. The system of claim 7 , further comprising a front drive shaft having a first splined end received by the interior spline surface of the hollow rotor shaft.

16. The system of claim 15 , wherein the first splined end of the front drive shaft includes a straight spline.

17. The system of claim 7 , wherein:

the first splined end of the rear drive shaft includes a crowned spline; and

the second splined end of the rear drive shaft includes a crowned spline.