A torque transfer device has plural planets arranged for planetary rotation about one or more sun gears and within one or more ring gears. Each planet includes at least one planetary gear set comprising plural planetary gears connected to rotate together, but having a different diameter to form a differential gear system. To improve load sharing, the plural planetary gears of each planetary gear set may have a different helical angle, the plural planetary gear sets being axially movable with respect to one another. Alternatively or in addition, the planetary gears may be made flexible with respect to radial forces.

A circular wave drive system is provided. In one aspect, the circular wave drive includes a compliant input ring gear having an inner surface having internal input ring gear teeth; an input cycloidal disc having an outer surface having external input cycloidal disc gear teeth oriented on the outer surface, and wherein the external input cycloidal disc gear teeth at least partially engage the internal input ring gear teeth; a compliant primary drive gear having an outer surface having external primary drive gear teeth; an eccentric motion generator including an eccentric portion and a non-eccentric portion and wherein a centerline of the eccentric portion and the non-eccentric portion are offset from one another; and an output cycloidal disc having an inner surface with internal output cycloidal disc teeth, and wherein the internal output cycloidal disc teeth at least partially engage the external primary drive gear teeth.

A planetary gear transmission has a sun gear, a ring gear, at least one first planet gear, and at least one second planet gear. The first planet gear and the second planet gear are arranged on a planet carrier, and the sun gear, the ring gear, the first planet gear, and the second planet gear mesh with one another. The planetary gear transmission is characterized in that the planet carrier has a first planet carrier part and a second planet carrier part. The first planet carrier part and the second planet carrier part are designed such that the planet carrier parts are rotated relative to each other starting from a base position and can be fixed in their respective rotated position relative to each other, wherein the at least one first planet gear is connected to the first planet carrier part, and the at least one second planet gear is connected to the second planet carrier part.

A bearing assembly includes a shaft, a first bearing, and a nut. The nut has a thread, which is screwed onto a threaded region formed on the shaft, and a bearing seat formed on the shaft adjoins the threaded region. The inner ring of the first bearing contacts the bearing seat, and the nut contacts the inner ring of the first bearing. The inner ring of the first bearing is arranged spaced apart from the threaded region of the shaft. A runout region of a thread cut into the threaded region of the shaft is arranged in a subsection of the bearing seat adjoining the threaded region.

A planetary gear for a planetary gearset has a gear body and a planetary gear shaft defining a planetary gear rotational axis (APR) of the planetary gear. The gear body includes a gear rim having a first number (n1) of teeth and a second number (n2) of ribs. The ribs extend between the planetary gear shaft and the gear rim, and planetary gear contact projections are arranged on the ribs and project beyond the gear rim along the planetary gear rotational axis (APR). Also disclosed is a planet carrier for such a planetary gear, including an insert for removing torque from the carrier body, which insert is connected to the first disk-shaped body. The first disk-shaped body forms a first free planet carrier face on which a number of reinforcing ribs are arranged.

An epicyclic gear assembly includes a carrier that includes a first plate axially spaced from a second plate. At least one epicyclic gear set is located between the first plate and the second plate. The first plate is configured to rotate with an output of the epicyclic gear assembly. A first bearing race is attached to the first plate for supporting a first bearing. A second bearing race is attached to the second plate for supporting a second bearing.

An epicyclic gear assembly includes a carrier that includes a first plate axially spaced from a second plate. At least one epicyclic gear set is located between the first plate and the second plate. The first plate is configured to rotate with an output of the epicyclic gear assembly. A first bearing race is attached to the first plate for supporting a first bearing. A second bearing race is attached to the second plate for supporting a second bearing.

A gearbox assembly for a turbine engine. The turbine engine includes a drive shaft and a fan shaft. The gearbox assembly includes a first gear, a second gear, an output, and a journal pin. The first gear is connected to the drive shaft. The second gear is supported by a planet carrier. The output is connected to the fan shaft. Torque is transferred from the drive shaft of the core turbine engine to the fan shaft through the gearbox assembly. The journal pin is inserted into the planet carrier. The second gear rotates about the journal pin. A coupling of the journal pin and the planet carrier is characterized by an interference ratio greater than a minimum interference ratio of 1.0e-5.

A disclosed fan drive gear system includes a sun gear rotatable about an axis of rotation, a plurality of intermediate gears rotatable about an intermediate gear rotation axis in meshing engagement with the sun gear and a ring gear circumscribing the intermediate gears. A bearing assembly supports at least one of the plurality of intermediate gears and includes a first beam extending in a first direction and a second beam extending from an end of the first beam in a second direction. The bearing surface supported on the second beam such that first and second beams are configured to maintain the bearing surface substantially parallel to the intermediate gear rotation axis during operation.

A disclosed fan drive gear system includes a sun gear rotatable about an axis of rotation, a plurality of intermediate gears rotatable about an intermediate gear rotation axis in meshing engagement with the sun gear and a ring gear circumscribing the intermediate gears. A bearing assembly supports at least one of the plurality of intermediate gears and includes a first beam extending in a first direction and a second beam extending from an end of the first beam in a second direction. The bearing surface supported on the second beam such that first and second beams are configured to maintain the bearing surface substantially parallel to the intermediate gear rotation axis during operation.