A power transmission device includes first and second drive shafts, a differential mechanism, a case, a pinion shaft, a pinion gear, and a bearing. The differential mechanism is connected to the second drive shaft. The differential mechanism includes a first side gear connected to the first drive shaft, a second side gear, first and second pinion mate gears that engage with the first and second side gears, first and second pinion mate shafts that respectively support the first and second pinion mate gears. The pinion gear includes small and large diameter gear parts. The bearing is positioned between the pinion shaft and the pinion gear, and is lubricated via an oil hole that is open facing an outside of the case at a small diameter gear part side. The small diameter gear part is positioned between the first and second pinion mate shafts in a circumferential direction.

A power transmission device includes first and second drive shafts, a differential mechanism, a case, a pinion shaft, a pinion gear, and a bearing. The differential mechanism is connected to the second drive shaft. The differential mechanism includes a first side gear connected to the first drive shaft, a second side gear, first and second pinion mate gears that engage with the first and second side gears, first and second pinion mate shafts that respectively support the first and second pinion mate gears. The pinion gear includes small and large diameter gear parts. The bearing is positioned between the pinion shaft and the pinion gear, and is lubricated via an oil hole that is open facing an outside of the case at a small diameter gear part side. The small diameter gear part is positioned between the first and second pinion mate shafts in a circumferential direction.

An axle assembly having a drive pinion, a transmission, and a shift collar. The transmission may include a set of drive pinion gears. The shift collar may be rotatable about an axis with the drive pinion and may be moveable along the axis with respect to the drive pinion to selectively connect a member of the set of drive pinion gears to the drive pinion.

A differential case includes an outer shell wall portion configured to accommodate a pinion gear therein, and a first groove is formed in an inner surface of the outer shell wall portion on a back surface side of the pinion gear. In addition, a convex portion is formed on the inner surface of the outer shell wall portion on the back surface side of the pinion gear, and the first groove is formed in the convex portion. Further, a diameter of the convex portion is equal to or larger than a diameter of a back surface of the pinion gear.

A differential case includes an outer shell wall portion configured to accommodate a pinion gear therein, and a first groove is formed in an inner surface of the outer shell wall portion on a back surface side of the pinion gear. In addition, a convex portion is formed on the inner surface of the outer shell wall portion on the back surface side of the pinion gear, and the first groove is formed in the convex portion. Further, a diameter of the convex portion is equal to or larger than a diameter of a back surface of the pinion gear.

A first rotation shaft (which is provided with a first gear) is assembled to a first case member so as to provide a first assembly. A second rotation shaft (which is provided with a second gear) and a third rotation shaft (which is provided with a third gear) are assembled to a support member so as to provide a second assembly. When the second assembly is assembled to the first assembly, the second assembly is rotatable around a third axis from a first position where the first gear and the second gear are located away from each other to a second position where the first gear and the second gear are in mesh with each other, and is positioned at the second position by using a positioning member.

A first rotation shaft (which is provided with a first gear) is assembled to a first case member so as to provide a first assembly. A second rotation shaft (which is provided with a second gear) and a third rotation shaft (which is provided with a third gear) are assembled to a support member so as to provide a second assembly. When the second assembly is assembled to the first assembly, the second assembly is rotatable around a third axis from a first position where the first gear and the second gear are located away from each other to a second position where the first gear and the second gear are in mesh with each other, and is positioned at the second position by using a positioning member.

Systems for a differential are provided. The differential includes two sets of pinion gears with an asymmetric split tooth profile. A case of the differential includes a plurality of lubrication ports which open adjacent to untoothed sections of one set of pinion gears and in a drive mode and an outboard axial load is exerted on the corresponding set of pinion gears.

Systems for a differential are provided. The differential includes two sets of pinion gears with an asymmetric split tooth profile. A case of the differential includes a plurality of lubrication ports which open adjacent to untoothed sections of one set of pinion gears and in a drive mode and an outboard axial load is exerted on the corresponding set of pinion gears.

A parallel axis gearbox is provided for a vehicle. The parallel axis gearbox includes an input shaft having a first axis of rotation and an intermediate shaft having a second axis of rotation parallel to the first axis of rotation. The intermediate shaft includes an intermediate driving gear, an intermediate driven gear, and a longitudinal bore passing through the intermediate shaft. The intermediate driven gear is meshingly engaged with a first driving gear on the input shaft. The input shaft and the intermediate shaft are contained within and supported by a cover fixedly coupled to a housing. A bolt fixedly couples the cover to the housing and passes through the longitudinal bore of the intermediate shaft.