Patent ID: 9236781
Filing Date: 2016-01-12
CPC Classification: B66D,E21B,F16H,H02K

Claim Text:
1. A drive assembly, comprising: a planetary gear box having at least one stage, the planetary gear box comprising an input shaft coupled with a sun gear and a rotational output coupled with an annular gear, the sun gear and annular gear being coupled through at least a plurality of planetary gears; wherein the input shaft and output each are rotatable about a common axis and the input shaft extends through a front side of the gear box; a hollow passageway extending through the input shaft from the front side of the planetary gear box to a back side of the planetary gear box opposite the front side of the planetary gear box, with openings at each end of the passageway; and at least one motor coupled to the input shaft exterior of the planetary gear box, the at least one motor being offset from the common axis of the planetary gear box, in a position that does not obscure the opening of the passageway on the front side of the planetary gear box.