A wheel rotation speed measurement assembly and a wheel hub driving system. The assembly includes a wheel hub bearer, a synchronous shaft and a compiler. The wheel hub bearer has a central shaft and an outer ring. The central shaft is hollow with an inner cavity and forms a torsion-resistant connection with a vehicle suspension. The outer ring can be driven to rotate relative to the central shaft, and forms a torsion-resistant connection with the wheel hub. The synchronous shaft is arranged in the inner cavity and has an end that is close to the first end has a torsion-resistant connection with the outer ring. The compiler is mounted at an end of the synchronous shaft away from the first end. The assembly has a simple structure and can measure the wheel rotation speed directly. Rotation speed output by this compact wheel hub driving system can be accurately measured.

Provided is a dual wheel assembly for engagement with an associated vehicle having an associated chassis, the assembly having an output support and a transmission. The output support has a bell housing adapted to operationally mount to the associated chassis, and a tail shaft. The tail shaft is rotatably mounted within the bell housing, defines and is rotatable about a drive axis, and is adapted to transmit operational drive work by rotation about the drive axis. The tail shaft is further adapted to transmit and support an operational support load transverse to the drive axis. The transmission is operationally engaged to the output support and has a transmission shaft. The transmission shaft defines a transmission shaft axis, is operationally engaged with the tail shaft, and is adapted to transmit the operational drive work to the tail shaft.

A drive module (1, 1a) includes an axle casing (2) and a shaft (3) rotatably mounted in an interior space (11) of the axle casing (2). Two bearing units (6, 6a) lie opposite each other and are secured in the axle casing (2) in an axial direction. Each bearing unit (6, 6a) includes an inner bearing ring (7, 7a) fixedly connected to the shaft (3), an outer bearing ring (8, 8a) fixedly connected to the axle casing (2), and rolling elements (9, 9a) arranged between the inner bearing ring (7, 7a) and the outer bearing ring (8, 8a). A lubricating fluid is present at least in the interior space (11). The lubricating fluid forming a fluid reservoir at a bottom of the interior space (11). The axle casing (2) includes a fluid opening extending, in each case, from the interior space (11) to a respective bearing unit (6, 6a) for conducting the lubricating fluid to the rolling elements (9, 9a). At least one conduction device is fluidically connected to the fluid reservoir and is configured for conducting the lubricating fluid the interior space (11) to the respective fluid opening.

A forked linkage includes a forked end and a control end. An axially translatable spline coupling is supported and carried by the forked end. A pivot is between the forked end and the control end. A cam is configured to interact with the control end of the forked linkage. The cam includes a profile that defines an axial position of the spline coupling relative to an angular position of the cam. A bias biases the control end towards the cam.