The rolling bearing has low friction resistance, can be preloaded, and is easy to maintain for lubrication. It can work stably within a certain range of speed and load variation. Rolling bearings are produced by specialized factories, which are easy to purchase and maintain. However, compared with sliding bearings, rolling bearings are very noisy, have a limited number of rolling elements, vary in rigidity, have slightly poorer vibration resistance, and have a large limit on the speed of rotation. Rolling bearings are classified into ball bearings and cylindrical roller bearings according to the structure of the rolling elements. Ceramic bearing means that the rolling elements of the bearing are made of ceramic materials, while the inner and outer rings are still made of bearing steel. The reason why the rolling element is selected is mainly because it has the following characteristics: one is light weight, the other is the thermal expansion coefficient is small, and the third is the elastic modulus. Therefore, it has the characteristics of low centrifugal force, low dynamic friction, stable pre-tightening force, small elastic deformation and high rigidity.