The automobile half shaft is also called the drive shaft, which is the shaft that connects the differential and the drive wheels.
The semi-shaft is the shaft that transmits torque between the gearbox reducer and the driving wheel. There is a universal joint (U/JOINT) at the inner and outer ends, respectively, which are connected to the reducer gear and the inner ring of the hub bearing through the spline on the universal joint. .

The role of automobile axle shaft
The half shaft transfers the power from the differential to the left and right driving wheels.
The half shaft is a solid shaft that transmits large torque between the differential and the drive axle. Its inner end is generally connected with the side gear of the differential by a spline, and the outer end is connected to the drive through a flange or spline. The wheel shells of the wheels are connected.
The half shaft structure is different due to the different structure of the drive axle. The half shaft in the non-disconnected drive axle is a rigid full shaft;
The half shafts in the steering drive axle and the split drive axle are segmented and connected by universal joints.
Automobile half shaft structure
The half shaft is used to transmit power between the differential and the drive wheels. The half shaft is the shaft that transmits the torque between the gearbox reducer and the drive wheel. Generally, it used to be mostly solid. Because the hollow shaft is easier to control unbalanced rotation, now, many cars use a hollow shaft, and the half shaft has a universal shaft on its inner and outer ends. The U/JOINT is connected to the gear of the reducer and the inner ring of the hub bearing through the spline on the universal joint.

Types of car axle shafts
The semi-axles commonly used in modern cars are classified into full-floating and semi-floating according to their different supporting types.
The full-floating semi-axle only transmits torque, and does not bear any reaction force or bending moment. Cooperating with the independent suspension, it is beneficial to improve the comfort of the vehicle, so it is widely used in various vehicles. The full-floating half-shaft is easy to disassemble and assemble. Only by unscrewing the fixing bolts of the half-shaft during maintenance, the half-shaft can be drawn out. The wheels and axle housing can still support the car, thus bringing convenience to car maintenance.
The semi-floating half shaft not only transmits torque but also bears all reaction forces and bending moments. Its supporting structure is simple and low in cost, and it is mainly suitable for pickup and SUV vehicles that do not require high comfort. However, this kind of half-shaft support is troublesome to dismantle, and if the half-shaft breaks during driving, it is easy to cause the risk of wheels flying off, which is a form that is about to be eliminated.
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