Epicyclic gearbox
First Claim
1. An epicyclic gear train comprising:
- planetary gears rotatably mounted on spindles supported by an annular carrier,each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub,axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles,an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears,andthe forward roller bearing being axially aligned with the forward set of output teeth and the aft roller bearing being axially adjacent to the input gear.
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Accused Products
Abstract
An epicyclic gear train includes planetary gears rotatably mounted on spindles supported by an annular carrier and including axially spaced apart forward and aft sets of output teeth extending radially outwardly from a planetary gear hub and axially spaced apart forward and aft roller bearings disposed between planetary gears and spindles. The forward and aft roller bearings are axially aligned with or adjacent to spaced apart forward set of output teeth and input gear respectively. A ring gear meshes with forward set of output teeth and an external gear meshes with aft set of output teeth. An input gear fixedly attached to hub aft of aft set of output teeth and engaged with a sun gear. The output teeth, input gear, ring gear, external gear, and sun gear may all be helical. A turbofan gas turbine engine may include counter-rotatable first and second fan stages driven by a low pressure turbine through the gear train.
49 Citations
21 Claims
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1. An epicyclic gear train comprising:
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planetary gears rotatably mounted on spindles supported by an annular carrier, each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub, axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, and the forward roller bearing being axially aligned with the forward set of output teeth and the aft roller bearing being axially adjacent to the input gear. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An epicyclic gear train comprising:
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planetary gears rotatably mounted on spindles supported by an annular carrier, each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub, axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles, a ring gear circumscribing and meshing with the forward set of output teeth and an external gear meshing with the aft set of output teeth, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, the forward set of output teeth meshing with the ring gear radially outwardly of the spindles and the aft set of output teeth meshing with the external gear radially inwardly of the spindles, the input gear of each of the planetary gears meshing with a sun gear radially inwardly of the spindles, the forward roller bearing being axially aligned with the forward set of output teeth and the aft roller bearing being axially adjacent to the input gear. - View Dependent Claims (8)
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9. An epicyclic gearbox comprising:
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an epicyclic gear train including planetary gears rotatably mounted on spindles supported by forward and aft conical carrier frames of an annular carrier, the forward and aft conical carrier frames including radially outer forward and aft carrier flanges respectively, the forward and aft conical carrier frames including radially inner forward and aft support flanges respectively fixedly supporting the spindles therebetween, the forward and aft support flanges connected by conical forward and aft support beams to the forward and aft carrier flanges, each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, the input gear of each of the planetary gears meshing with a sun gear, and axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles. - View Dependent Claims (10, 11, 12, 13)
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14. A turbofan gas turbine engine comprising:
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a fan section including counter-rotatable first and second fan stages radially supported, at least in part, by a fan frame, a low pressure turbine downstream of the fan section and drivingly connected to the first and second fan stages by a low pressure shaft through an epicyclic gear train in an epicyclic gearbox, the epicyclic gear train including planetary gears rotatably mounted on spindles supported by an annular carrier, each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub, axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, and the forward roller bearing being axially aligned with the forward set of output teeth and the aft roller bearing being axially adjacent to the input gear.
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15. A turbofan gas turbine engine comprising:
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a fan section including counter-rotatable first and second fan stages radially supported, at least in part, by a fan frame, a low pressure turbine downstream of the fan section and drivingly connected to the first and second fan stages by a low pressure shaft through an epicyclic gear train in an epicyclic gearbox, the epicyclic gear train including planetary gears rotatably mounted on spindles supported by an annular carrier, each of the planetary gears including a hollow planetary gear hub and axially spaced apart forward and aft sets of output teeth extending radially outwardly from the planetary gear hub, axially spaced apart forward and aft roller bearings disposed between the planetary gears and the spindles, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, the second fan stage connected to a ring gear circumscribing and meshing with the forward set of output teeth, the first fan stage connected to an external gear meshing with the aft set of output teeth, an input gear fixedly attached to the planetary gear hub aft of the aft set of output teeth of each of the planetary gears, and the input gear of each of the planetary gears meshing with a sun gear connected to the low pressure shaft. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification