Patent ID: 8439451

Claim:
A machine including a gear case for transmitting rotational power from a drive to a driven member, said gear case including an elongated housing, a plurality of single gears mounted in a row within said elongated housing, with one gear at one end of the row being drivingly connected to the drive, and another gear at another end of the row being drivingly connected to the driven member, each single gear mounting including a longitudinal gear axle having a mounting axis extending longitudinally along said gear axle, lubricating oil surrounding said single gears and contained within said housing, and a cooling system for said gear case, said cooling system including a coolant injection system in each of said single gears, each coolant injection system including a longitudinal opening in said gear axle, extending a substantial distance along said mounting axis, a coolant injection tube mounted inside said longitudinal opening, extending a substantial distance from one end of said longitudinal opening inside said longitudinal opening, said coolant injection tube having a diameter smaller than the diameter of said longitudinal opening, a coolant supply line connected to and in communication with said coolant injection tube, and a coolant outlet connected to and in communication with said longitudinal opening adjacent said one end of said longitudinal opening, so that a coolant leaving the end of the coolant injection tube travels back along the coolant injection tube and then out of the gear axle thereby removing heat from the single gear, wherein, coolant exiting the coolant outlet of a first single gear flows into the coolant injection tube of a second single gear.