Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy.
According to the different friction properties of moving elements, bearings can be divided into rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, they have larger radial size, vibration and noise, and higher price.
Rolling bearing is generally composed of outer ring, inner ring, rolling element and cage. According to the shape of rolling element, rolling bearing is divided into ball bearing and roller bearing.