Gearbox planet attenuation spring damper
First Claim
1. A planet gearbox for connection to a carrier of an epicyclic gearing arrangement that has only a single input and a single output and that includes a sun gear and a ring gear surrounding the planet gearbox and the sun gear, the planet gearbox comprising:
- a support pin is configured to be fixed to the carrier, the support pin is a hollow body that is defined by a cylindrical outer surface that is radially equidistant from a virtual central axis that extends in an axial direction, the support pin is further defined by an inner surface disposed opposite the cylindrical outer surface;
an inner ring is non-rotatably connected to the support pin and defines an inner surface opposed to the outer surface of the support pin, the inner ring defining an outer surface that defines at least one track, each track defined in the outer surface being configured to receive and rotatably guide therein a respective plurality of cylindrical rollers;
an outer ring defines an inner cylindrical surface that is disposed facing toward the at least one track, the outer ring defining an outer cylindrical surface that is disposed facing toward the ring gear;
a respective plurality of cylindrical rollers rotatably disposed within each respective track of the inner ring, and each of the plurality of rollers rotatably contacting the inner cylindrical surface of the outer ring; and
a planet gear is non-rotatably connected to the outer ring and defines an inner surface opposed to the outer surface of the outer ring, the planet gear defining an outer surface that defines a gear tooth surface that is configured to mesh with both the sun gear and the ring gear; and
an attenuation spring disposed between the outer surface of the outer ring and the inner surface of the planet gear.
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Accused Products
Abstract
An epicyclic gearing arrangement includes a planet gear rotatable on a planet bearing that is mounted via a support pin to a carrier of the epicyclic gearing arrangement. An attenuation spring is disposed between the outer surface of the bearing'"'"'s outer ring and the opposing inner surface of the planet gear and includes an annular gap. A spring film damper is disposed between the cylindrical outer surface of the support pin and the opposing inner surface of the inner ring of the planet bearing and includes an annular gap. The support pin (96) and/or outer ring include oil feed holes that open into the respective annular gap(s). A gas turbine engine includes an epicyclic gearing arrangement having such a planet bearing.
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Citations
20 Claims
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1. A planet gearbox for connection to a carrier of an epicyclic gearing arrangement that has only a single input and a single output and that includes a sun gear and a ring gear surrounding the planet gearbox and the sun gear, the planet gearbox comprising:
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a support pin is configured to be fixed to the carrier, the support pin is a hollow body that is defined by a cylindrical outer surface that is radially equidistant from a virtual central axis that extends in an axial direction, the support pin is further defined by an inner surface disposed opposite the cylindrical outer surface; an inner ring is non-rotatably connected to the support pin and defines an inner surface opposed to the outer surface of the support pin, the inner ring defining an outer surface that defines at least one track, each track defined in the outer surface being configured to receive and rotatably guide therein a respective plurality of cylindrical rollers; an outer ring defines an inner cylindrical surface that is disposed facing toward the at least one track, the outer ring defining an outer cylindrical surface that is disposed facing toward the ring gear; a respective plurality of cylindrical rollers rotatably disposed within each respective track of the inner ring, and each of the plurality of rollers rotatably contacting the inner cylindrical surface of the outer ring; and a planet gear is non-rotatably connected to the outer ring and defines an inner surface opposed to the outer surface of the outer ring, the planet gear defining an outer surface that defines a gear tooth surface that is configured to mesh with both the sun gear and the ring gear; and an attenuation spring disposed between the outer surface of the outer ring and the inner surface of the planet gear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A gas turbine engine comprising:
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a fan including a plurality of blades extending radially from a hub and rotatable about a first axis of rotation defined centrally through the hub; a compressor disposed downstream from the fan; a turbine disposed downstream of the compressor; a rotatable input shaft mechanically coupling the compressor to rotate in unison with the turbine; an epicyclic gearing arrangement that has only a single input and that includes a carrier, a sun gear rotatable about a second axis of rotation that is parallel to the first axis of rotation, a ring gear disposed circumferentially around the sun gear, at least one planet gearbox that is carried by the carrier and houses a planet gear rotatable with respect to the carrier about a third axis of rotation that is parallel to the second axis of rotation, wherein the at least one planet gear meshes with both the sun gear and the ring gear; and an engine envelope surrounding the fan, the compressor, the turbine and the epicyclic gearing arrangement, wherein one of the ring gear and the carrier is non-rotatably coupled to the engine envelope; and the planet gearbox further including; a support pin is configured to be fixed to the carrier, the support pin is a hollow body that is defined by a cylindrical outer surface that is radially equidistant from a virtual central axis that extends in an axial direction, the support pin is further defined by an inner surface disposed opposite the cylindrical outer surface; an inner ring is non-rotatably connected to the support pin and defines an inner surface opposed to the outer surface of the support pin, the inner ring defining an outer surface that defines at least one track, each track defined in the outer surface being configured to receive and rotatably guide therein a respective plurality of cylindrical rollers; an outer ring defines an inner cylindrical surface that is disposed facing toward the at least one track, the outer ring defining an outer cylindrical surface that is disposed facing toward the ring gear; a respective plurality of cylindrical rollers rotatably disposed within each respective track of the inner ring, and each of the plurality of rollers rotatably contacting the inner cylindrical surface of the outer ring; and a planet gear is non-rotatably connected to the outer ring and defines an inner surface opposed to the outer surface of the outer ring, the planet gear defining an outer surface that defines a gear tooth surface that is configured to mesh with both the sun gear and the ring gear; and an attenuation spring disposed between the outer surface of the outer ring and the inner surface of the planet gear. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification