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US 2023/0142715 A1Published application
Compound symmetric gearbox for a turbomachine
AssigneeGE Avio S.r.l.
InventorsJuraj Hrubec, Leonardo Coviello
Life of this patent
Estimating the term…
Abstract
A gear assembly for use with a turbomachine engine comprises a sun gear, a plurality of planet gears, and a ring gear. The gear assembly is connected to an input shaft and an output shaft. The sun gear is configured to rotate about a longitudinal centerline of the gear assembly and is driven by the input shaft. A component of the gear assembly drives the output shaft. The planet gears can be compound planet gears having a first stage and a second stage.
Claims20
An epicyclic gear assembly, comprising:
- an input shaft;
- an output shaft;
- a sun gear connected to the input shaft and having a sun gear pitch diameter;
- a plurality of compound planet gears disposed radially outward from the sun gear, each compound planet gear of the plurality of compound planet gears comprising a first stage with a first stage pitch diameter and a second stage with a second stage pitch diameter;
- and
- a ring gear having a ring gear pitch diameter disposed radially outwards of the plurality of compound planet gears, connected to the output shaft and configured to drive the output shaft;
- wherein the sun gear is configured to be driven by an input shaft and is engaged with the first stage of the plurality of compound planet gears;
- wherein the second stage of each compound planet gear is engaged with the ring gear;
- wherein the sun gear pitch diameter is greater than the first stage pitch diameter and second stage pitch diameter is greater than the first stage pitch diameter, such that the first stage of the compound planet gear is a multiplicator gear and the second stage of the compound planet gear is a reductor gear.
6 more elements
A turbomachine comprising:
- an input shaft;
- an output shaft;
- and
- an epicyclic gear assembly comprising a drive gear, a multiplicator gear, a reductor gear, and an output gear;
- wherein the drive gear is attached to the input shaft and engaged with the multiplicator gear;
- wherein the reduction gear and the multiplicator gear are coaxial and configured to rotate together;
- wherein the reduction gear is engaged with the output gear;
- and
- wherein the output gear is attached to the output shaft.
6 more elements
An aircraft comprising:
- a turbofan engine having a core engine output shaft, a gear assembly, and an output shaft configured to drive a first fan assembly, wherein the gear assembly comprises:
- a sun gear connected to the core engine output shaft and having a sun gear pitch diameter;
- a plurality of compound planet gears disposed radially outward from the sun gear having a first stage with a first stage pitch diameter and a second stage with a second stage pitch diameter;
- and
- a ring gear having a ring gear pitch diameter disposed radially outwards of the plurality of compound planet gears, connected to the output shaft and configured to drive the output shaft;
- wherein the sun gear is configured to be driven by an input shaft and is engaged with the first stage of the plurality of compound planet gears;
- wherein the second stage of each compound planet gear of the plurality of compound planet gears is engaged with the ring gear;
- wherein the sun gear pitch diameter is greater than the first stage pitch diameter and second stage pitch diameter is greater than the first stage pitch diameter, such that the first stage is a multiplicator gear and the second stage is a reductor gear.
5 more elements
Dependencies are inferred from the claim text.