And the hardness of the cage is lower than the ball and ring, the material has metal (such as: Medium carbon steel, aluminum alloy) or non-metallic (such as: Teflon, PTEF, polymer materials). Rolling bearing (rolling bearing) is smaller than the rotational frictional resistance of the axle-neck bearing (journal bearing), so the temperature of friction will be lower because of the same rotational speed.
Ball bearings are generally used in low load mechanical transmission equipment. Because the bearing area of ball bearing is small, it is very easy to have serious mechanical damage in the condition of high speed operation, so the needle roller bearing is often adopted in heavy load mechanical transmission to increase the bearing surface, improve the efficiency of mechanical transmission and reduce the mechanical damage.
Ball bearings change the friction of bearings, using rolling friction, this way more effectively reduce the friction between the bearing surface, improve the service life of the fan bearing, and therefore the life of the radiator will be extended. The disadvantage is that the process is more complex, the cost increases, and also the higher the work noise.