A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1) .

A walk-behind tractor has an increased ground clearance to define a plant receiving space that has a greater height than a conventional walk-behind tractor having a straight axle. The walk-behind tractor has trailing drop arms from a frame that carry wheel axles that result in an elevated height of a driveshaft. The elevated driveshaft increases the ground clearance for taller plants to pass therebeneath during operation of the walk-behind tractor which would otherwise be too tall to pass below a conventional straight axle walk-behind tractor.

A walk-behind tractor has an increased ground clearance to define a plant receiving space that has a greater height than a conventional walk-behind tractor having a straight axle. The walk-behind tractor has trailing drop arms from a frame that carry wheel axles that result in an elevated height of a driveshaft. The elevated driveshaft increases the ground clearance for taller plants to pass therebeneath during operation of the walk-behind tractor which would otherwise be too tall to pass below a conventional straight axle walk-behind tractor.

A vibration-reducing portal box assembly for mounting a wheel of an off-road vehicle includes a housing with a receptacle adapted to receive a stock axle shaft of an off-road vehicle, an output shaft operably connectable to a stock axle received in the housing and effective to rotate upon rotation of said stock axle, and a wheel hub having a central opening adapted to receive said output shaft, and adapted to turn a wheel mounted to said wheel hub upon rotation of said output shaft. The output shaft has a tapered portion connecting its proximal end to its distal end. The wheel hub has a tapered portion adapted to matingly receive the tapered portion of the output shaft. The output shaft may be connected to the stock axle shaft by a geared linking mechanism.

A vibration-reducing portal box assembly for mounting a wheel of an off-road vehicle includes a housing with a receptacle adapted to receive a stock axle shaft of an off-road vehicle, an output shaft operably connectable to a stock axle received in the housing and effective to rotate upon rotation of said stock axle, and a wheel hub having a central opening adapted to receive said output shaft, and adapted to turn a wheel mounted to said wheel hub upon rotation of said output shaft. The output shaft has a tapered portion connecting its proximal end to its distal end. The wheel hub has a tapered portion adapted to matingly receive the tapered portion of the output shaft. The output shaft may be connected to the stock axle shaft by a geared linking mechanism.

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.

A shaft connection 1 for a longitudinal shaft assembly, has at least a first shaft having a first and second ends, and a second shaft, disposed so as to be coaxial with the first shaft, having first and second ends; the shafts extending axially. The first end forms a hollow portion. The first shaft end forms a first journal having a displacement portion. The first shaft end at least in an initial position of the shaft connection extends through the hollow portion which axially by the displacement portion forms a guide portion and circumferentially forms a form-fitting first connection. In the initial position a mutual axial displacement of the first and second shafts is prevented by an axial securing feature. In a crash the axial securing feature; is releasable by an axial release force. The first shaft is axially displaceable relative to the second shaft.

A shaft connection 1 for a longitudinal shaft assembly, has at least a first shaft having a first and second ends, and a second shaft, disposed so as to be coaxial with the first shaft, having first and second ends; the shafts extending axially. The first end forms a hollow portion. The first shaft end forms a first journal having a displacement portion. The first shaft end at least in an initial position of the shaft connection extends through the hollow portion which axially by the displacement portion forms a guide portion and circumferentially forms a form-fitting first connection. In the initial position a mutual axial displacement of the first and second shafts is prevented by an axial securing feature. In a crash the axial securing feature; is releasable by an axial release force. The first shaft is axially displaceable relative to the second shaft.

The present disclosure provides a reducer for an electric vehicle, the reducer including an input shaft connected to a motor, a differential disposed coaxially with the input shaft and relatively rotatable, a planetary gear train configured to decelerate power of the input shaft and transmit the power to a differential casing of the differential, and a drive shaft configured to penetrate the input shaft and coupled to one side gear of the differential.

A transmission assembly for a vehicle, includes a first input shaft gear wheel arranged on a first input shaft, a second input shaft first gear wheel and a second input shaft second gear wheel arranged axially offset with respect to each other on a second input shaft, an output shaft first gear wheel and an output shaft second gear wheel arranged axially offset with respect to each other on a common output shaft. The second input shaft first gear wheel meshes with the output shaft first gear wheel, and the first input shaft gear wheel and the second input shaft second gear wheel mesh with the output shaft second gear wheel. A first torque path is provided from the first input shaft to the output shaft.