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A gearbox assembly (10) configured for easy to assembling comprises a plurality of gears (30) configured to spin within a plurality of inner gear rings (20, 22). Fixing mechanisms (40) are axially inserted from the input side (12) of the gearbox, thereby allowing for a connector (90) to be attached

A gearbox assembly (10) configured for easy to assembling comprises a plurality of gears (30) configured to spin within a plurality of inner gear rings (20, 22). Fixing mechanisms (40) are axially inserted from the input side (12) of the gearbox, thereby allowing for a connector (90) to be attached to the output shaft (62) of the gearbox prior to gearbox assembling.

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1. A gearbox assembly having a power input end and a power output end, comprising: a plurality of inner gear rings;a plurality of gear groups rotably attached to the plurality of inner gear rings and mechanically coupled to each other to transfer torque between the power input end and the power outp

1. A gearbox assembly having a power input end and a power output end, comprising: a plurality of inner gear rings;a plurality of gear groups rotably attached to the plurality of inner gear rings and mechanically coupled to each other to transfer torque between the power input end and the power output end; anda plurality of fixing members inserted from the power input end and extending axially through holes in each of the plurality of inner gear rings, so as to fix the plurality of inner gear rings together,wherein a first inner gear ring of the plurality of inner gear rings that is adjacent the power input end comprises a plurality of protrusions extending in an axial direction and configured to mate with a plurality of recesses associated with an electric motor, wherein the plurality of protrusions are monolithic with the first inner gear ring, anda plurality of fasteners extending radially through holes in each of the plurality of protrusion, such that the holes in each of the plurality of inner gear rings through which the plurality of fixing members axially extend are oriented perpendicular to the holes in each of the plurality of protrusions through which the plurality of fastener radially extend. 2. The gearbox assembly of claim 1, wherein a fixing member of the plurality of fixing members comprises a head portion adjacent the power input end and a tail portion adjacent the power output end. 3. The gearbox assembly of claim 2, wherein the fixing member comprises a threaded screw. 4. The gearbox assembly of claim 1, wherein a gear group of the plurality of gear groups comprises a solar gear and at least one planetary gear. 5. The gearbox assembly of claim 4, wherein the gear group further comprises a spinning frame coaxial with the solar gear, mechanically coupled to the at least one planetary gear, and rotably attached to a solar gear of another gear group of the plurality of gear groups. 6. The gearbox assembly of claim 1, wherein the plurality of inner gear rings comprise a helical gear ring and at least one spur gear ring. 7. The gearbox assembly of claim 6, wherein the helical gear ring is located at the power input end and comprises a recess configured to accommodate a head portion of a fixing member of the plurality of fixing members. 8. The gearbox assembly of claim 1, wherein the plurality of fasteners fix the first inner gear ring adjacent the power input end to the electric motor, wherein the plurality of fasteners extend radially through the holes in each of the plurality of protrusions, such that the plurality of fasteners each have a longitudinal axis that is oriented radially. 9. The gearbox assembly of claim 1, further comprising a sleeve enclosing a portion of the plurality of inner gear rings and having at least one mounting structure for mounting the gearbox assembly. 10. The gearbox assembly of claim 9, wherein the sleeve further comprises a bearing housing. 11. The gearbox assembly of claim 1, wherein: the plurality of inner gear rings comprises two inner gear rings; and the plurality of gear groups comprises three planetary gear groups. 12. A process for assembling a gearbox, comprising: attaching a connector onto a first end of an output shaft;mechanically coupling a second end of the output shaft to a plurality of gear groups configured to spin within a plurality of gear rings;mating a plurality of protrusions that extend in an axial direction of a first gear ring out of the plurality of gear rings that is remote from the connector with a plurality of recesses associated with an electric motor; andaxially inserting a plurality of fixing members from an end remote from the connector into holes in each of the plurality of gear rings to fix together the plurality of gear rings,radially inserting a plurality of fasteners into holes in each of the plurality of protrusions to the first gear ring to the electric motor,wherein the plurality of protrusions are monolithic with the first gear ring, andwherein the holes in each of the plurality of gear rings are oriented perpendicular to the holes in each of the plurality of protrusions. 13. The process of claim 12, further comprising: mechanically coupling a solar gear in a first gear group of the plurality of gear groups remote from the connector to an shaft of the electric motor. 14. The process of claim 13, wherein the plurality of fasteners each have a longitudinal axis that is oriented radially. 15. The process of claim 13, wherein mechanically coupling the second end of the output shaft to the plurality of gear groups further comprises: mechanically coupling a solar gear in a second gear group of the plurality of gear groups to a planetary gear of the first gear group;mechanically coupling a solar gear of a third gear group of the plurality of gear groups to a planetary gear of the second gear group; andmechanically coupling the second end of the output shaft to a planetary gear of the third gear group. 16. The process of claim 15, wherein mechanically coupling the solar gear in the second gear group to the planetary gear of the first gear group further comprises: attaching a spinning frame coaxial with the solar gear of the first gear group to the planetary gear of the first gear group; andsynchronizing a rotation of the solar gear of the second gear group with a rotation of the spinning frame. 17. The process of claim 12, wherein axially inserting the plurality of fixing members comprises screwing in the plurality of fixing members. 18. The process of claim 12, wherein mechanically coupling the second end of the output shaft to the a plurality of gear groups further comprises including a helical planetary gear group and spur planetary gear group in the plurality of gear groups.