Axle shafts can be divided into full-floating axle shafts, three-quarter floating axle shafts and semi-floating axle shafts according to different support types. Full-floating axle shafts only transmit torque, do not bear reaction force and bending moment, are easy to disassemble and assemble, easy to maintain in the later stage, and are widely used. Semi-floating axle shafts not only transmit torque, but also bear the reaction force and bending moment of the car. They have a simple support structure and low production cost, and are suitable for cars with small reaction force and bending moment.