The described reduction gearbox of a gas turbine engine includes a first gear reduction stage having an input gear adapted to be driven by a turbine output shaft. The input gear transfers power received from the turbine output shaft laterally away from the input gear to an input speed gear. Each inp
The described reduction gearbox of a gas turbine engine includes a first gear reduction stage having an input gear adapted to be driven by a turbine output shaft. The input gear transfers power received from the turbine output shaft laterally away from the input gear to an input speed gear. Each input speed gear engages an output speed gear to define a main speed reduction gear set, and the main speed reduction gear sets are laterally spaced apart from one another to define a gap. The gearbox has a second gear reduction stage driven by the output speed gears, the second stage adapted to drive an engine output shaft.
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1. A reduction gearbox for a gas turbine engine for reducing the rotational speed of a turbine output shaft and driving an engine output shaft, comprising a first gear reduction stage having an input gear adapted to be driven by the turbine output shaft about a longitudinal input axis, the input gea
1. A reduction gearbox for a gas turbine engine for reducing the rotational speed of a turbine output shaft and driving an engine output shaft, comprising a first gear reduction stage having an input gear adapted to be driven by the turbine output shaft about a longitudinal input axis, the input gear transferring power to drive laterally spaced apart input speed gears about at least one transversely extending gear axis, each said input speed gear engaging an output speed gear to form a main speed reduction gear set, each main speed reduction gear set being spaced laterally from the longitudinal input axis of the input gear on opposed sides thereof to define a transverse gap therebetween, the engaged input and output speed gears of the main speed reduction gear set performing a majority of the reduction in the rotational speed of the turbine output shaft. 2. The reduction gearbox of claim 1, further comprising a second gear reduction stage driven by the output speed gears of the first gear reduction stage, the second stage adapted to drive the engine output shaft. 3. The reduction gearbox of claim 2, wherein the second gear reduction stage comprises a planetary gear train. 4. The reduction gearbox of claim 1, wherein the output speed gear of each main speed reduction gear set has a diameter greater than a diameter of the corresponding input speed gear. 5. The reduction gearbox of claim 1, wherein the transverse gap is shaped and sized between each main speed reduction gear set to receive therein an engine component. 6. The reduction gearbox of claim 5, wherein the engine component is an air intake. 7. The reduction gearbox of claim 6, wherein at least the input gear is disposed within the air intake. 8. The reduction gearbox of claim 1, wherein each main speed reduction gear set lies in a vertical plane on opposed sides of the input gear, the planes being parallel and equally spaced apart on opposed sides of the reduction gearbox. 9. The reduction gearbox of claim 1, wherein the input gear is an input bevel gear rotatable about the input axis. 10. The reduction gearbox of claim 9, wherein the input gear engages two transfer gears to transfer power to drive the laterally spaced apart input speed gears, each transfer gear being a first bevel gear engaging the input bevel gear, each input speed gear rotatable about the same gear axis as a corresponding first bevel gear. 11. The reduction gearbox of claim 9, wherein each output speed gear is mounted to an output transmission shaft extending laterally inwardly from a corresponding output speed gear to a second bevel gear mounted at a laterally inner end thereof. 12. The reduction gearbox of claim 11, wherein each second bevel gear engages an output bevel gear, the output bevel gear being rotatable about an output axis. 13. The reduction gearbox of claim 12, wherein each of the gear axes is non-parallel to both the input axis and the output axis, the input and output axes being parallel. 14. The reduction gearbox of claim 13, wherein the input axis and the output axis are vertically offset. 15. A method for reducing the rotational speed of a turbine output shaft of a gas turbine engine, comprising: driving an input gear of a gearbox about a longitudinal input axis with the turbine output shaft;transferring the power received by the input gear to drive laterally spaced apart main speed reduction gear sets about at least one transversely extending gear axis, each main speed reduction gear set being spaced laterally from the longitudinal input axis on opposed sides thereof to define a transverse gap therebetween;performing a majority of the reduction in the rotational speed of the turbine output shaft with the main speed reduction gear sets; anddriving an output gear of the gearbox about an output axis with the power from the main speed reduction gear sets. 16. The method of claim 15, further comprising integrating the input gear and the transfer gears with an air intake of the gas turbine engine. 17. The method of claim 15, wherein transferring the power includes splitting the power between two transfer gears, each transfer gear directing the power laterally away from the input gear. 18. The method of claim 17, wherein splitting the power includes rotating each transfer gear about a corresponding gear axis being non-parallel to the input axis and to the output axis. 19. The method of claim 15, wherein driving the output gear includes driving a second stage of gear reduction with the output gear, the second stage of gear reduction comprising a planetary gear train. 20. A reduction gearbox for a gas turbine engine for reducing the rotational speed of a turbine output shaft and driving an engine output shaft, comprising: a first gear reduction stage having an input gear adapted to be driven by the turbine output shaft about a longitudinal input axis, the input gear transferring power to drive laterally spaced apart input speed gears about at least one transversely extending gear axis, each said input speed gear engaging an output speed gear to form a main speed reduction gear set, each main speed reduction gear set being spaced laterally from the longitudinal input axis of the input gear on opposed sides thereof to define a transverse gap therebetween, the engaged input and output speed gears of the main speed reduction gear set performing a majority of the reduction in the rotational speed of the turbine output shaft; anda second gear reduction stage driven by the output speed gears of the first gear reduction stage, the second stage adapted to drive the engine output shaft.
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