A drive system has at least one drive unit each drive unit including a central shaft and a central gear connected to the central shaft such that the central gear rotates at a speed of the central shaft. Two to four decentralized gears are distributed around the circumference of the central gear and mesh with the central gear such that the rotational speed of the central gear is at least 0.5 times the rotational speed of the decentralized gears. A plurality of electric machines are operable at a speed of at least 4,000 rpm, and each decentralized gear wheel is coupled directly and without transmission ratio to a single electric machine or to two electric machines, respectively.

A modular electric power steering system is disclosed. The system includes a tubular neck which guides a universal joint. The tubular neck has a certain bend angle. The system further includes a drive assembly that has an electric motor which is controlled by a control unit. The system additionally includes a gearbox assembly having a torque sensor and a gearbox. The system also includes a steering rod that has a shortenable tube. Further, the system includes a gearbox housing that houses the gearbox assembly. In addition, the system includes two tubular toothed rack housing halves that are shortenable. The gearbox housing is disposed between the two toothed rack housing halves. The system also includes two feet which are disposed at the respective outer end of the two toothed rack housing halves. The feet serve to fasten the power steering system to the vehicle. And the feet include a bushing for guiding the toothed rack.

A drive system has at least two drive units each including a central shaft, a central gear wheel connected to the central shaft such that the central gear wheel rotates at a speed of the central shaft, and two to four decentralized gear wheels distributed over the circumference of the central gear wheel and meshing with the central gear wheel such that the speed of the central gear wheel is at least 0.5 times the speed of the decentralized gear wheels. The rotational speed of the central gear wheel is at least 0.5 times the rotational speed of the decentralized gear wheels. Each decentralized gear wheel is coupled directly and without transmission to a single electric machine, or to two electric machines of a plurality of electric machines. The central shafts of the drive units are coupled to form a series connection of the drive units.

A driving device includes a motor unit including a motor, and a speed reducer attached to the motor unit. The speed reducer includes a plurality of gears combined to decelerate an output of the motor, and a gear case configured to support the plurality of gears and attached to the motor unit. The gear case is selected from a plurality of types of gear cases. The plurality of types of gear cases are different from one another in an arrangement of the plurality of gears and a position of an output shaft relative to an input shaft.

A driving device includes a motor unit including a motor, and a speed reducer attached to the motor unit. The speed reducer includes a plurality of gears combined to decelerate an output of the motor, and a gear case configured to support the plurality of gears and attached to the motor unit. The gear case is selected from a plurality of types of gear cases. The plurality of types of gear cases are different from one another in an arrangement of the plurality of gears and a position of an output shaft relative to an input shaft.

A modular high precision gear box arrangement includes first and second gear boxes. The first gear box has a first rotatable hollow wheel, a second fixed hollow wheel and at least one double planet having a first planet and a second planet arranged on a planet shaft. The first planet meshes with the first hollow wheel, the second planet meshes with the second hollow wheel, and the first hollow wheel is coupled with an output. The second gear box includes a fixed hollow wheel that is the second hollow wheel of the first gear box and at least one planet that is the second planet of the at least one double planet of the first gear box. The second gear box further includes an input for driving the planet shaft, wherein the input is arranged centrically or eccentrically to a central rotation axis of the gear box arrangement.

Methods and systems for an electric drive axle of a vehicle are provided. An electric drive axle system includes, in one example, a gear train configured to rotationally attach to an electric motor-generator. The gear train includes an output shaft rotationally coupled to a first planetary gear assembly axially offset from an input shaft rotationally coupled to the electric motor-generator, the first planetary gear assembly configured to removably couple to a differential arranged co-axial with an axle.

A portal gear box assembly effective to lift and change the gear ratio of a wheel of an off-road vehicle includes a housing, an input gear sub-assembly, an output gear sub-assembly, and an idler gear sub-assembly effective for linking the input gear to the output gear. The input gear sub-assembly includes an input gear, the output gear sub-assembly includes an output gear, and the idler gear sub-assembly includes at least one idler gear and at least one removable adaptor effective for holding the idler gear in either a first position or a second position different from the first position. The sub-assemblies may also include bearings to facilitate movement of the gears.

A transmission includes a first housing part, a second housing part connected to the first housing part, and bearings accommodated in the first housing part and supporting an input shaft in a rotatable manner. The input shaft projects through a recess that extends through the second housing part, and a cover part is connected to the first housing part. The cover part or a flange part inserted into the cover part accommodates a sealing system, which provides sealing with respect to the input shaft. The second housing part has an inlet for lubricating oil, which terminates in an axial bore being open with respect to the side of the first housing part facing the cover part, and in a second annular space. The opening of the axial bore facing the cover part is covered and/or sealed by the cover part, and rolling elements of two bearings at least also restricting and/or surrounding the second annular space together with the first housing part.

A transmission includes a first housing part, a second housing part connected to the first housing part, and bearings accommodated in the first housing part and supporting an input shaft in a rotatable manner. The input shaft projects through a recess that extends through the second housing part, and a cover part is connected to the first housing part. The cover part or a flange part inserted into the cover part accommodates a sealing system, which provides sealing with respect to the input shaft. The second housing part has an inlet for lubricating oil, which terminates in an axial bore being open with respect to the side of the first housing part facing the cover part, and in a second annular space. The opening of the axial bore facing the cover part is covered and/or sealed by the cover part, and rolling elements of two bearings at least also restricting and/or surrounding the second annular space together with the first housing part.