Planetary Gear Assembly

摘要

A modified planetary gear box and arrangement of the gear box with a drive motor permits electrical, optical or other types of cabling or wiring to be passed through the planetary gear box along its axis of rotation. The planetary gear box drives or rotates a reel of coiled tubing. Electrical, hydraulic, optical and other types of line for lowering into a well bore through the coiled tubing is passed through a passageway through the center of the planetary gear box, into one end of a hub of the reel, and then into the coiled tubing, which is injected into the wellbore. The other end of the hub of the reel is able to be connected to a swivel joint that can be connected to a pump for pumping fluid into the coiled tubing.

主权项

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 annual gear being coupled through at least a plurality of planetary gears; wherein the output is located on a back side of the planetary gear box opposite of a front side of the planetary gear box, on which the input shaft is located, and the input and output each are rotatable about a common axis; a hollow passageway extending through the input shaft from the front side of the planetary gear box to the back side of the planetary gear box, with openings at each end of the passageway; and at least one motor coupled to the input shaft, the at least one motor is offset from the common axis of the planetary gear set, in a position that does not obscure the opening of the passageway.