The half shaft of a car is the transmission shaft. The car needs to turn after walking. The rotation of the wheels on both sides is different. Faster on one side and slower on the other. This requires a differential on the transmission shaft. The differential is a device that allows the wheels on both sides to rotate at different speeds. The half shaft is connected to the differential and then to the wheels.

The two ends of each axle are respectively connected to the wheels and the differential on the side, and the torque and speed distributed by the differential are transmitted to the wheels to drive the wheels to rotate. The rotational speed transmitted by half shafts of general construction machinery such as loaders and cranes will be further decelerated by the wheel-side reducer to increase the torque and make the wheels have a stronger driving force. The wheel speed reducer is the planetary gear reducer.

The drive shaft uses two half shafts is designed to improve the vehicle"s turning performance.