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 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 differential apparatus includes: a differential mechanism that distributes an input driving force to a pair of side gears so as to allow differential motion therebetween; a differential case that accommodates the differential mechanism; and a clutch mechanism that transmits the driving force between the differential case and pinion shafts of the differential mechanism. The clutch mechanism includes: a slide member that is movable relative to the pinion shafts of the differential mechanism in the axial direction of the differential case and is non-rotatable relative thereto in the differential case; and an actuator that applies an axial moving force to the slide member. The slide member has on one end portion a first meshing portion. The differential case includes a disc-shaped first case member and a bottomed-cylindrical second case member that accommodates the differential mechanism. The second case member has a second meshing portion facing the first meshing portion.

An axle assembly having an input shaft, an output shaft, and an interaxle differential unit. The interaxle differential unit includes first and second side gears, a case, and a pinion gear that is rotatably disposed on a pinion pin. The case extends from the input shaft. The pinion pin extends from the case and is spaced apart from the input shaft.

An axle assembly having an input shaft, an output shaft, and an interaxle differential unit. The interaxle differential unit includes first and second side gears, a case, and a pinion gear that is rotatably disposed on a pinion pin. The case extends from the input shaft. The pinion pin extends from the case and is spaced apart from the input shaft.

A first abutting surface, a first welding surface, a first facing surface are formed in a differential case. A second abutting surface, a second welding surface, and a second facing surface are formed in a differential ring gear. In an installing step, the first abutting surface and the second abutting surface are inserted, positions of the differential case and the differential ring gear are determined in an axial direction, a separation portion that spaces the first welding surface and the second welding surface away from each other and that has a non-linear portion is formed, and a void is formed between the first facing surface and the second facing surface. In a welding step, a laser is irradiated to the separation portion and the first welding surface and the second welding surface are welded.

The invention relates to a differential or transfer gearbox (10) in a motor vehicle, a method of production and the use of the differential or transfer gearbox (10). The differential or transfer gearbox (10) comprises a differential case (12) in which differential side gears (18, 20) and differential gears (22, 24) are accommodated. Each differential side gear (18) drives a first axle shaft (14) or a second axle shaft (16). A ring gear (32, 60) is driven by an input shaft (34) and mounted for conjoint rotation with the differential case (12). The ring gear (32, 60) is interlockingly connected to the differential case (12) of the differential or transfer gearbox (10).

The invention relates to a differential or transfer gearbox (10) in a motor vehicle, a method of production and the use of the differential or transfer gearbox (10). The differential or transfer gearbox (10) comprises a differential case (12) in which differential side gears (18, 20) and differential gears (22, 24) are accommodated. Each differential side gear (18) drives a first axle shaft (14) or a second axle shaft (16). A ring gear (32, 60) is driven by an input shaft (34) and mounted for conjoint rotation with the differential case (12). The ring gear (32, 60) is interlockingly connected to the differential case (12) of the differential or transfer gearbox (10).