Fan bearings are the core components used in air-cooled radiators to reduce frictional resistance and ensure long-term stable operation of fans. They are mainly used in fields such as computer cooling. Its types are divided into two categories: oil lubricated bearings with sliding friction and ball bearings with rolling friction, as well as mixed forms combining the two Oil containing bearings use lubricating oil to reduce friction, with low initial noise and low cost. However, the lubricating oil is prone to volatilization and is affected by dust, resulting in a shorter lifespan (about 5000-8000 hours). Ball bearings use a rolling friction mechanism, with a lifespan of tens of thousands to 100000 hours, but they have high manufacturing costs and operating noise. Improved bearings such as hydraulic bearings can increase their lifespan to 40000 hours through a loop back oil supply system, magnetic levitation bearings reduce friction through non-contact design, and nano ceramic bearings enhance wear resistance with high hardness materials
