Bearing is an important component in contemporary mechanical equipment.Its main function is to support mechanical rotating bodies, reduce their frictioncoefficient during motion, and ensure their rotational accuracy.

According to the different friction properties of moving components, bearingscan be divided into two categories: rolling bearings and sliding bearings. Rollingbearings have been standardized and serialized, but compared to sliding bearings,they have larger radial dimensions, vibration, and noise, and are also more expensive.

Rolling bearings are generally composed of four parts: outer ring, inner ring, rollingelement, and retainer. Strictly speaking, they are composed of six major components:outer ring, inner ring, rolling element, retainer, seal, and lubricating oil. Simply put,as long as it has the outer ring, inner ring, and rolling element, it can be defined as arolling bearing. According to the shape of the rolling element, rolling bearings aredivided into two categories: ball bearings and roller bearings.