A propulsion system for an electric vehicle includes an assembly of four electric propulsion machines each having a stator and a rotor having an output shaft that is movable in rotation about an axis. Also includes is a common gearwheel that is kinematically connected to the n output shafts and that is able to receive the torque provided by the electric machines so as to form a first speed reducer, and primary gearwheels able to be driven by the common gearwheel. An intermediate shaft is able to be driven by intermediate gearwheels, each primary gearwheel being kinematically connected to a corresponding intermediate gearwheel so as to form a pair of gears with which a second speed reducer is associated, and a secondary shaft that is able to drive the vehicle and that has a secondary gearwheel kinematically connected to the intermediate shaft so as to form a third speed reducer.

Drive system for an electric vehicle including a first sub-assembly of electric machines kinematically connected to a first common gear, and a second sub-assembly of electric machines kinematically connected to a second common gear. A first set of gear trains is kinematically connecting the first sub-assembly to a secondary shaft capable of driving the driving wheels of the vehicle, wherein a first selective coupling system is arranged to select a first gear train or a second gear train from a neutral position during a gear change phase. A second sub-assembly kinematically connects the second common gear to the secondary shaft. The second sub-assembly of electric machines is controlled so as to supply additional torque making it possible to compensate for the loss of torque resulting from the uncoupling of the first sub-assembly inherent in the gear change.

A motor vehicle drive shaft has a receptacle tube component with a receptacle internal diameter and a push-fit component with a push-fit external diameter. The push-fit external diameter is smaller than or equal to the receptacle internal diameter. The receptacle tube component and the push-fit component can be rotated about a common drive shaft rotational axis and extend along the latter in a longitudinal direction. The receptacle tube component and the push-fit component are connected to one another for the transmission of torque. A connecting component is provided, wherein the connecting component is connected in a torque-conducting manner to the receptacle tube component by way of a receptacle connection. The connecting component is connected to the push-fit component by way of a push-fit connection. At least one of the two connections is configured as a combined frictionally locking and positively locking shaft/hub connection.

A low surface-roughness part is formed at a first tapered part, and, as a result, the roughness of an opening-edge of a groove part of an internal spline part that opens at the first tapered part is reduced, and surface pressure applied by the opening edge to a tooth of an external spline part can be reduced. As a result, the opening edge of the groove part of the internal spline part can be kept from digging into the tooth, and variation, between products, in the insertion load of a second shaft part can be suppressed.

A drive train for an electric truck includes a gearbox and a gear box housing. The drive train further includes an output shaft extending in an axial direction across a wall of the gear box housing and powering a cardan shaft arranged outside of the gear box housing. At least one output gear is arranged inside of the gear box housing on the output shaft. At least a first and a second electric motor attached to the housing of the gearbox form a team of electric motors, wherein each electric motor includes a drive shaft extending parallel to the axial direction and being interconnected via an input gear to an output gear.

An air and land multimodal vehicle comprises a frame, a propeller engine attached to a first location of the frame supplying power and torque to a propeller, a ground engine attached to a second location of the frame supplying power and torque to one or more ground traction elements, and a flexible wing releasably connectable to the frame, wherein the propeller engine is vertically and horizontally spaced from the ground engine.

An air and land multimodal vehicle comprises a frame, a propeller engine attached to a first location of the frame supplying power and torque to a propeller, a ground engine attached to a second location of the frame supplying power and torque to one or more ground traction elements, and a flexible wing releasably connectable to the frame, wherein the propeller engine is vertically and horizontally spaced from the ground engine.

[Technical problem] To provide a power transmission mechanism for a four-wheel drive vehicle in which a prime mover is disposed at a low position to lower the center of gravity of the vehicle while a driving path from a transmission to a front wheel differential mechanism is also shortened. [Solutions] In a power transmission mechanism for a four-wheel drive vehicle, the power of a prime mover is transmitted to a front wheel differential mechanism which is disposed in front of the prime mover, and to a rear wheel differential mechanism which is disposed behind a transmission, through the transmission which is disposed behind the prime mover. The transmission comprises a front and rear wheel drive shaft that extends along the longitudinal direction of the vehicle body. The transmission is arranged separately from the prime mover and a rear axle drive device. The rear end portion of the front and rear wheel drive shaft is connected to an input shaft of the rear wheel differential mechanism. The front end portion of the front and rear wheel drive shaft is connected to an input shaft of the front wheel differential mechanism via a front wheel power transmission shaft that extends along the longitudinal direction of the vehicle body and passes through the space beneath the prime mover. The front wheel differential mechanism, the prime mover, the transmission, and the rear wheel differential mechanism are arranged along the longitudinal direction of the vehicle body at the center of the vehicle width of the vehicle.

[Technical problem] To provide a power transmission mechanism for a four-wheel drive vehicle in which a prime mover is disposed at a low position to lower the center of gravity of the vehicle while a driving path from a transmission to a front wheel differential mechanism is also shortened. [Solutions] In a power transmission mechanism for a four-wheel drive vehicle, the power of a prime mover is transmitted to a front wheel differential mechanism which is disposed in front of the prime mover, and to a rear wheel differential mechanism which is disposed behind a transmission, through the transmission which is disposed behind the prime mover. The transmission comprises a front and rear wheel drive shaft that extends along the longitudinal direction of the vehicle body. The transmission is arranged separately from the prime mover and a rear axle drive device. The rear end portion of the front and rear wheel drive shaft is connected to an input shaft of the rear wheel differential mechanism. The front end portion of the front and rear wheel drive shaft is connected to an input shaft of the front wheel differential mechanism via a front wheel power transmission shaft that extends along the longitudinal direction of the vehicle body and passes through the space beneath the prime mover. The front wheel differential mechanism, the prime mover, the transmission, and the rear wheel differential mechanism are arranged along the longitudinal direction of the vehicle body at the center of the vehicle width of the vehicle.

Apparatus and methods for achieving a high strength bonded joint between a stub connector and a shaft.