DOUBLE ROW CYLINDRICAL ROLLER BEARING WITH HIGH LENGTH TO DIAMETER RATIO ROLLERS
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 disposed circumferentially around the planet gearbox and the sun gear, the planet gearbox comprising:
- a support pin configured to be fixed to the carrier and defining a cylindrical outer surface that is equidistant from a central axis that extends in an axial direction;
an inner race defining a cylindrical inner surface that is non-rotatably connected to the cylindrical outer surface of the support pin, the inner race 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;
a respective plurality of cylindrical rollers rotatably disposed within each respective track of the inner race;
an outer race defining an inner cylindrical surface contacting each respective plurality of cylindrical rollers, the outer race defining an outer cylindrical surface that defines a gearing surface that is configured to mesh with both the sun gear and the ring gear;
wherein each cylindrical roller defines a cylindrical outer surface that is disposed with an axis of rotation that extends in a direction parallel to the axial direction, and the cylindrical outer surface of each cylindrical roller is defined by a diameter that extends through the axis of rotation along a direction that is normal to the axis of rotation; and
wherein the outer cylindrical surface of each cylindrical roller defines a length in the direction parallel to the axis of rotation of the cylindrical roller, and the ratio of each cylindrical roller'"'"'s length to each cylindrical roller'"'"'s diameter is greater than one.
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Accused Products
Abstract
A planet gearbox is provided for connection to a carrier of an epicyclic gearing arrangement with a single input and single output and including a sun gear, a ring gear and at least one double helix planet gear rotatable on a cylindrical roller bearing wherein the ratio of each cylindrical roller'"'"'s length to each cylindrical roller'"'"'s diameter exceeds 1.0. A gas turbine engine includes a shaft coupling a compressor of a compressor section to a turbine of a turbine section. An epicyclic gearing arrangement has a single input from the shaft coupled to a sun gear, a single output from the carrier that is coupled to the shaft of a fan and includes a planet gearbox with cylindrical rollers having a length-to-diameter ratio exceeding 1.0.
21 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 disposed circumferentially around the planet gearbox and the sun gear, the planet gearbox comprising:
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a support pin configured to be fixed to the carrier and defining a cylindrical outer surface that is equidistant from a central axis that extends in an axial direction; an inner race defining a cylindrical inner surface that is non-rotatably connected to the cylindrical outer surface of the support pin, the inner race 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; a respective plurality of cylindrical rollers rotatably disposed within each respective track of the inner race; an outer race defining an inner cylindrical surface contacting each respective plurality of cylindrical rollers, the outer race defining an outer cylindrical surface that defines a gearing surface that is configured to mesh with both the sun gear and the ring gear; wherein each cylindrical roller defines a cylindrical outer surface that is disposed with an axis of rotation that extends in a direction parallel to the axial direction, and the cylindrical outer surface of each cylindrical roller is defined by a diameter that extends through the axis of rotation along a direction that is normal to the axis of rotation; and wherein the outer cylindrical surface of each cylindrical roller defines a length in the direction parallel to the axis of rotation of the cylindrical roller, and the ratio of each cylindrical roller'"'"'s length to each cylindrical roller'"'"'s diameter is greater than one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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 section disposed downstream from the fan and including one or more compressors; a turbine section located downstream of the compressor section, the turbine section including one or more turbines; a rotatable input shaft mechanically coupling at least one of the one or more compressors of the compressor section to rotate in unison with at least one of the one or more turbines of the turbine section; an epicyclic gearing arrangement that has only a single input and a single output 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 second axis of rotation that is parallel to the first axis of rotation, the at least one planet gear meshes with both the sun gear and the ring gear; and an engine envelope surrounding the fan, the compressors, the turbines and the epicyclic gearing arrangement, wherein only 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 fixed to the carrier and defining a cylindrical outer surface that is equidistant from a central axis that extends in an axial direction, an inner race defining an inner cylindrical surface that is non-rotatably connected to the cylindrical outer surface of the support pin, the inner race defining an outer surface that defines a at least one track that is configured to receive and rotatably guide therein a respective plurality of cylindrical rollers, an outer race defining an inner cylindrical surface and an outer cylindrical surface that defines a gearing surface of the planet gear and that is configured to mesh with both the sun gear and the ring gear, a plurality of cylindrical rollers wherein the individual cylindrical rollers being distributed between each track of the inner race, each cylindrical roller being free to rotate about a third axis of rotation that is parallel to the second axis of rotation, each cylindrical roller defining a cylindrical outer surface contacting both the inner race and the inner cylindrical surface of the outer race, each cylindrical roller defining a length in the direction parallel to the third axis of rotation and wherein the ratio of each cylindrical roller'"'"'s length to each cylindrical roller'"'"'s diameter is greater than one. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification