The ball bearing changes the friction mode of the bearing and adopts rolling friction. This method is more effective in reducing the friction between the bearing surfaces, improving the service life of the fan bearing and thus prolonging the service life of the radiator. The disadvantage is that the process is more complicated, the cost is increased, and it also brings higher working noise.
In terms of its role, it should be support, that is, literal interpretation is used for the bearing shaft, but this is only part of its function, and its essence is to be able to bear the radial load. It can also be understood that it is used to fix the shaft. It is the fixed shaft that allows it to only rotate and control its axial and radial movement.