Disclosed is a drive train having a drive shaft of a driven machine, a drive machine, and a differential transmission with three drives or outputs, wherein one output can be connected to the drive shaft, a first drive can be connected to the drive machine, and a second drive can be connected to a differential drive. The differential drive is connected to the second drive via an adjusting gear system with gears, and the drive shaft is connected to the output via an output gear system with gears. Viewed from the drive machine in the direction of the axis of the drive shaft, the gears of the adjusting gear system project at least as far as into the area of the gears of the output gear system.

Disclosed is a drive train having a drive shaft of a driven machine, a drive machine, and a differential transmission with three drives or outputs, wherein one output can be connected to the drive shaft, a first drive can be connected to the drive machine, and a second drive can be connected to a differential drive. The differential drive is connected to the second drive via an adjusting gear system with gears, and the drive shaft is connected to the output via an output gear system with gears. Viewed from the drive machine in the direction of the axis of the drive shaft, the gears of the adjusting gear system project at least as far as into the area of the gears of the output gear system.

An axle assembly having a drive pinion that may be rotatably supported by first and second sets of roller bearing elements. A preload element may exert a preload force on at least one of the first and second sets of roller bearing elements. The preload element may be disposed on the drive pinion in an inboard direction from the yoke.

An axle assembly having a drive pinion that may be rotatably supported by first and second sets of roller bearing elements. A preload element may exert a preload force on at least one of the first and second sets of roller bearing elements. The preload element may be disposed on the drive pinion in an inboard direction from the yoke.

A trim ring gear for use in an integrated drive generator has a ring gear body extending between a first end and a second end. Outer gear teeth are formed on an outer surface, and inner gear teeth are formed on an inner surface. The outer tooth roll angle at A is between 16.0 and 17.5, at B is between 17.5 and 190, at C is between 22.0 and 23.5, and at D is between 23.0 and 24.5. The inner tooth roll angle at A is between 31.5 and 33.0, at B is between 30.0 and 31.5, at C is between 25.5 and 27.0, and at D is between 24.0 and 25.5. An integrated drive generator, and a method of replacing the trim ring gear are also disclosed and claimed.

A trim ring gear for use in an integrated drive generator has a ring gear body extending between a first end and a second end. Outer gear teeth are formed on an outer surface, and inner gear teeth are formed on an inner surface. The outer tooth roll angle at A is between 16.0 and 17.5, at B is between 17.5 and 190, at C is between 22.0 and 23.5, and at D is between 23.0 and 24.5. The inner tooth roll angle at A is between 31.5 and 33.0, at B is between 30.0 and 31.5, at C is between 25.5 and 27.0, and at D is between 24.0 and 25.5. An integrated drive generator, and a method of replacing the trim ring gear are also disclosed and claimed.

A power transmission system includes: a power source; a speed change unit, where the speed change unit is selectively power-coupled to the power source; a first motor generator unit; a system power output portion; and a mode conversion device, where the mode conversion device includes: a conversion device input portion and a conversion device output portion, the conversion device input portion outputs power from at least one of the power source and the first motor generator unit, the conversion device output portion is connected to an input end of the system power output portion, and the conversion device input portion is selectively power-coupled to the conversion device output portion; and when the conversion device input portion is power-coupled to the conversion device output portion, the rotational speed of the conversion device input portion is greater than or equal to the rotational speed of the conversion device output portion.

A clutch for a Rear Drive Unit (RDU) selectively couples one of the half-shafts to an intermediate shaft. The clutch is actuated with a ball-ramp mechanism having a plate that rotates in response to rotation of a motor. In order to provide precise control of clutch torque capacity, a high gear reduction is desirable. Gear reduction is provided by a planetary gear set located co-axially with the clutched half-shaft. In addition to providing a relatively high gear ratio, this is more likely to fit into the available space without interfering with other components.

A clutch for a Rear Drive Unit (RDU) selectively couples one of the half-shafts to an intermediate shaft. The clutch is actuated with a ball-ramp mechanism having a plate that rotates in response to rotation of a motor. In order to provide precise control of clutch torque capacity, a high gear reduction is desirable. Gear reduction is provided by a planetary gear set located co-axially with the clutched half-shaft. In addition to providing a relatively high gear ratio, this is more likely to fit into the available space without interfering with other components.

An axle assembly having a preload mechanism. The preload mechanism engages a bearing assembly and includes a preload element and an adjuster element. The preload element is disposed inside a housing and is rotatable about an axis. The adjuster element engages the preload element and is moveable to actuate the preload element and exert a preload force on a bearing assembly. The adjuster element is accessible from outside of the housing.