A differential is a device that allows the wheels on each side to rotate at different speeds, and the axle is attached to the differential and then to the wheels.
The two ends of each half shaft are connected with the wheels and the differential on its side respectively, and the torque and speed distributed by the differential are transferred to the wheels to drive the wheels to rotate.
General engineering machinery, such as loaders, cranes and other half-axis of the transmission of the speed through the wheel side reducer to further decelerate, in order to increase the torque,
so that the wheel has a stronger driving force. Wheelside reducers are planetary gear reducers.