Bearing is a basic part of mechanical equipment, the main function is to support the mechanical rotating body, reduce the friction coefficient of the mechanical rotating body during operation, to ensure the rotation accuracy of the mechanical rotating body, known as "industrial joint". Bearing product specifications and models are more, according to the host supporting type can be divided into wind power bearings, engineering machinery bearings, automobile bearings, machine tool bearings, railway bearings, metallurgical mining machinery bearings, etc. According to the load direction of the bearing, it can be divided into radial bearing and axial bearing. According to the friction properties between the shaft and the bearing seat when the bearing works, it can be divided into two categories: plain bearings and rolling bearings, of which rolling bearings are the main products of the bearing industry, usually referred to as bearings, generally referring to rolling bearings.
