A flange part is usually provided in the wheel hub assembly of the wheel, useing for transmiting the force and moment between the wheel and the vehicle body. The flange part is installed on the wheel shaft and transmits the shaft torque to drive the wheel to rotate. The working principle is that the wheel and the brake disc are fixed on the flange of the flange part by bolts, and are connected with the steering knuckle through the bearing, so that the wheel can rotate with the wheel shaft through the bearing.