A power transmission device includes a pinion gear having a large pinion gear and a small pinion gear, a carrier that supports the pinion gear, a ring gear that engages with the small pinion gear, an oil supply unit positioned above a horizontal line that passes through a revolution center of the pinion gear, and a downstream side wall part facing a gear surface of the large pinion gear. The downstream side wall part is arranged to be adjacent to the oil supply unit further downstream in a revolution direction of the pinion gear than the oil supply unit when viewed from an axial direction.

A power transmission device includes a gear mechanism, a wall part that overlaps with the gear mechanism in an axial direction, a plate provided between the wall part and the gear mechanism in the axial direction, and a park lock mechanism. The park lock mechanism has a parking pawl on a side of a surface of the plate facing the wall part. The park lock mechanism has a manual shaft and/or a detent mechanism on a side of a surface of the plate facing the gear mechanism.

An oil collector for a mechanical reduction gear of a turbomachine, in particular for an aircraft, the reduction gear including a body having two opposite lateral faces configured to extend in part around planet gears of the reduction gear, the collector further including an internal oil circulation cavity connected firstly to oil inlets located on the faces, and on the other hand to at least one oil outlet, characterised in that at least one of the faces comprises includes columns and rows of several inlets each having a recess with a progressively increasing cross-section, each recess being delimited by walls, at least some of the walls having a hydrodynamic profile.

A power transmission device includes a bearing, a differential mechanism, a case that houses the differential mechanism, a pinion gear supported by the case, a wall part that overlaps the case in an axial direction, a plate that is provided between the wall part and the case in the axial direction, and that supports the case with the bearing being interposed, and a parking pawl that is rotatably fixed to the plate in a position that overlaps the plate in the axial direction.

A power transmission device includes a box, a case disposed in the box, a differential mechanism housed in the case, and a planetary gear mechanism disposed in the box and supported by the case. The planetary gear mechanism includes a sun gear and a pinion gear that engages with the sun gear. The box has a shelf part above a horizontal line that passes through a revolution center of the pinion gear. The shelf part is arranged at a position that does not overlap the sun gear when viewed from radially above.

A power transmission device includes a motor, a gear mechanism connected downstream of the motor and lubricated by oil, and a box. The box has a wall part that covers an outer circumference of the gear mechanism, and a jacket part that covers an outer circumference of the wall part. A cooling chamber, in which cooling liquid is introduced, is formed between the wall part and the jacket part. The cooling chamber includes a portion that overlaps with the gear mechanism when seen from a radial direction, and a portion that overlaps the gear mechanism when seen from an axial direction.

A compact geared reduction unit for application with transmission shaft subjected to radial loads, comprising a box-like body inside which a gear system is accommodated for the transmission of rotary motion from a driving shaft to a transmission shaft, which is provided with an output reduction stage of the epicyclic type; the output reduction stage comprises a driving sun gear which rotates about a main axis and a ring gear which is integrally associated with the box-like body, between which multiple planet gears are engaged which are supported in rotation about respective longitudinal axes which are parallel to the main axis by a transmission planet carrier, which in turn rotates about the main axis and is associated so as to be integral in rotation with the transmission shaft at a connection region. The reduction unit furthermore provides for rolling means adapted to support radial loads associated with the transmission shaft.

A carrier assembly has a pair of axially spaced-apart plates defining an axial gap therebetween. The plates have a plurality of planetary bores on a plurality of planetary axes. A plurality of planetary gear mount assemblies are disposed on the planetary axes and mounted within the planetary bores of the gear carrier. Each assembly comprises a journal bearing shaft having a pair of compliance grooves extending axially from opposed axial ends of the shaft. An inner cylindrical surface of each compliance groove defines a shaft mounting surface. A pair of collars is provided to assemble each journal bearing shaft to the carrier. Each collar has a mounting socket mating the shaft mounting surface and an external collar surface matching the planetary bore diameter.

An epicyclic gear train for a turbine engine includes a gutter with an annular channel. A rotating structure includes a ring gear that has an aperture that is axially aligned with the annular channel. Axially spaced apart walls extend radially outward relative to the rotating structure to define a passageway. The passageway is arranged radially between and axially aligned with the aperture and the annular channel. The walls are configured to inhibit an axial flow of an oil passing from the aperture toward the annular channel.

Disclosed is a drive unit (10) with a housing (12), an electric motor (14) arranged in the housing with a rotor shaft (26). At least two oil chambers (30) are arranged in the housing (12). In each case the oil chambers include an oil zone (38) and an air zone (40) with an oil capture pocket (46). The oil chambers are flow-connected to one another via an overflow channel (42). Axial end areas of the rotor shaft (26) project into the oil chambers (30), and the rotor shaft defines a connecting channel (34) which flow-connects the oil chambers (30) to one another. A transmission is coupled to one axial end area or the rotor shaft (26) and an impulse disk (32) is coupled to the opposite axial end area, where each axial end area conveys oil to the respective oil capture pocket (46).