A movable barrier operator that includes a motor, an armature shaft of the motor, and a worm screw assembled with a distal end portion of the armature shaft. The movable barrier operator further includes a worm wheel engaged with the worm screw and a rotatable drive member connected to the worm wheel. Turning of the armature shaft and worm screw mounted thereto causes turning of the worm wheel and rotatable drive member.

A series of planetary gearboxes includes a plurality of subseries of planetary gearboxes. Each of the plurality of subseries includes a planetary gear carrier of a planetary stage, at least two rolling bearings, and a planetary gear mounted on the at least two rolling bearings. The at least two rolling bearings in a first one of the first plurality of subseries have a first bearing width and in a second one of the first plurality of subseries having a second bearing width.

A series of planetary gearboxes includes a plurality of subseries of planetary gearboxes. Each of the plurality of subseries includes a planetary gear carrier of a planetary stage, at least two rolling bearings, and a planetary gear mounted on the at least two rolling bearings. The at least two rolling bearings in a first one of the first plurality of subseries have a first bearing width and in a second one of the first plurality of subseries having a second bearing width.

A dual drive unit may include two motors, two power transfer mechanisms, and two output shafts. The output shafts are co-linear. The dual drive unit may include two single drive units, which may be similar to each other, coupled together at a joint, which may optionally include a clutch. A drive unit may be modular, and various components may be combined to provide power to an output shaft. For example, a drive unit may include a differential at a first interface, which may be removable, and two drive units may be coupled together at the first interface. A drive unit may have a Z configuration, wherein a motor on a first side of a vehicle powers a wheel on an opposite side of the vehicle.

A dual drive unit may include two motors, two power transfer mechanisms, and two output shafts. The output shafts are co-linear. The dual drive unit may include two single drive units, which may be similar to each other, coupled together at a joint, which may optionally include a clutch. A drive unit may be modular, and various components may be combined to provide power to an output shaft. For example, a drive unit may include a differential at a first interface, which may be removable, and two drive units may be coupled together at the first interface. A drive unit may have a Z configuration, wherein a motor on a first side of a vehicle powers a wheel on an opposite side of the vehicle.

A powershift transmission for an agricultural machine includes a transmission housing, an input shaft unit and an output shaft, wherein the input shaft unit and the output shaft extend at least in sections within the transmission housing. An auxiliary shaft is arranged parallel to but offset between the input shaft unit and the output shaft. The input shaft unit and the auxiliary shaft are connected to one another via a front-mounted range unit, and the auxiliary shaft and the output shaft are connected to one another via a rear-mounted range unit. The front-mounted and rear mounted range units each includes at least two gear wheel pairs, the at least two gear wheel pairs being individually coupled or decoupled. The auxiliary shaft unit includes a first auxiliary shaft and a second auxiliary shaft, where the first and second auxiliary shafts are coupled to one another via a reduction gear unit.

A modular multi-engine system having a plurality of engines and a plurality of gear units each gear unit having at least one rotatable member and a drive shaft being driven by one of the plurality of engines, where at least one of the gear units is a main gear and the other peripheral gear unit(s). Each rotatable member of each gear unit engages at least one other rotatable member of an adjacent gear unit such as to ultimately transfer torque from all the engines operable in said modular multiengine system to an output drive shaft connected to said main gear unit. The rotatable member of at least one of the peripheral gear units is located at a different height than at least one other cogwheel of another gear unit. The main gear unit includes an upper rotatable member and a lower rotatable member coaxially connected.

A modular multi-engine system having a plurality of engines and a plurality of gear units each gear unit having at least one rotatable member and a drive shaft being driven by one of the plurality of engines, where at least one of the gear units is a main gear and the other peripheral gear unit(s). Each rotatable member of each gear unit engages at least one other rotatable member of an adjacent gear unit such as to ultimately transfer torque from all the engines operable in said modular multiengine system to an output drive shaft connected to said main gear unit. The rotatable member of at least one of the peripheral gear units is located at a different height than at least one other cogwheel of another gear unit. The main gear unit includes an upper rotatable member and a lower rotatable member coaxially connected.

A longitudinal multi-shift electrically driving power assembly, wherein the longitudinal multi-shift electrically driving power assembly includes an electric motor and a plurality of sets of gearboxes, each of the gearboxes is a single-shift reduction gearbox or a multi-shift reduction gearbox, the gearboxes are connected in series to form a gearbox assembly, and an output shaft of the electric motor and an input shaft of the gearbox assembly are integrally manufactured. The power assembly employs the plurality of sets of gearboxes that are connected in series, which improves the performance of the power assembly without adding a power source.

A transmission series has a first transmission and a second transmission. The first transmission and the second transmission each have a respective input shaft, a housing, a supporting structure fixed in the housing, and at least two bearings by means of which the input shaft is mounted rotatably in the respective supporting structure. The at least two bearings of the first transmission are of the same first design and the at least two bearings of the second transmission are of the same second design that is different from the first design. The supporting structures of the first and second transmissions are designed identically.