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A split torque gearbox system provides a multiple path, three stage power gear train that transmits torque from a high-speed engine to a low speed output shaft, while providing equal gear load distribution with a floating pinion in the second stage of reduction. The number of the split modules in th

A split torque gearbox system provides a multiple path, three stage power gear train that transmits torque from a high-speed engine to a low speed output shaft, while providing equal gear load distribution with a floating pinion in the second stage of reduction. The number of the split modules in the gearbox depends on gearbox configuration, number of high speed input shafts, and transmitted power. The split modules are located around a last stage output gear that combines power from each module and transmits the power to an output such as a main rotor system.

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1. A split torque gearbox system comprising: a first gear mounted for rotation about a first gear axis of rotation;a second gear mounted for rotation about a second gear axis of rotation;a floating gear mounted to a pinion shaft and driven by said pinion shaft, wherein said pinion shaft is a radiall

1. A split torque gearbox system comprising: a first gear mounted for rotation about a first gear axis of rotation;a second gear mounted for rotation about a second gear axis of rotation;a floating gear mounted to a pinion shaft and driven by said pinion shaft, wherein said pinion shaft is a radially unsupported pinion shaft, said floating gear mounted for rotation about a floating gear axis of rotation, said floating gear meshed with said first gear and said second gear; andwherein said floating gear axis of rotation, said first gear axis of rotation, and said second gear axis of rotation are located along a common line. 2. The split torque gearbox as recited in claim 1, wherein said floating gear axis of rotation, said first gear axis of rotation, and said second gear axis of rotation are generally parallel to one another. 3. The split torque gearbox system as recited in claim 1, wherein said floating gear is mounted to a distal end of said pinion shaft. 4. The split torque gearbox system as recited in claim 1, further comprising a face gear mounted to said pinion shaft to define a gear mesh generally transverse to the floating pinion axis of rotation. 5. The split torque gearbox system as recited in claim 4, wherein said gear mesh includes a spiral bevel gear teeth arrangement. 6. The split torque gearbox system as recited in claim 1, further comprising: a first double helical gear driven by said first gear, said first double helical gear defined along said first gear axis of rotation; anda second double helical gear driven by said second gear, said second double helical gear defined along said second gear axis of rotation. 7. The split torque gearbox system as recited in claim 6, further comprising an output gear meshed with said first and second double helical gear. 8. The split torque gearbox system as recited in claim 7, further comprising a main rotor shaft driven by said output gear. 9. The split torque gearbox system as recited in claim 1, wherein said first gear is a first spur gear. 10. The split torque gearbox system as recited in claim 1, wherein said second gear is a second spur gear. 11. The split torque gearbox system as recited in claim 1, wherein said floating gear is a floating pinion gear. 12. The split torque gearbox system as recited in claim 1, wherein said floating gear axis of rotation is arranged on the common line when in a first position, and is displaced from the common line when in a second position. 13. A split torque gearbox system for a rotary wing aircraft comprising: an input shaft including at least one input shaft gear arranged along the input shaft;two face gears driven by the at least one input shaft, the two face gears disposed on generally opposite sides of the input shaft;a first and second pair of spur gears, each of the first and second pair of spur gears including a first spur gear mounted for rotation about a first gear axis of rotation, and a second spur gear mounted for rotation about a second gear axis of rotation;two pinion gears driven by a respective one of the two face gears, each of the pinion gears connected to a respective one of the two face gears by way of a radially unsupported pinion shaft, each of the pinion gears engaging a respective one of the first and second pair of spur gears, wherein each of the pinion gears is mounted for rotation about a floating gear axis of rotation, and wherein each floating gear axis of rotation is located along a common line with a respective first gear axis of rotation and a respective second gear axis of rotation. 14. The split torque gearbox system as recited in claim 13, wherein the at least one input shaft gear includes two input shaft gears. 15. The split torque gearbox system as recited in claim 13, wherein said input shaft is driven by a gas turbine engine. 16. The split torque gearbox system as recited in claim 13, wherein the face gears each define a gear face perpendicular to an axis of rotation of the respective gear face, the input shaft angled relative to each gear face. 17. The split torque gearbox system as recited in claim 13, wherein each of said floating gear axes of rotation are arranged on a respective common line when in a first position, and wherein each of said floating gear axes of rotation are displaced from the common line when in a second position.