The main function of the bearing is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load during the transmission process of the equipment. 

Bearings are components that fix and reduce the friction coefficient of loads during mechanical transmission. It can also be said that when other parts move relative to each other on the shaft, 

it is used to reduce the friction coefficient during power transmission and keep the center of the shaft fixed.

The early form of linear motion bearings was to place a row of wooden poles under a row of pry plates. Modern linear motion bearings use the same working principle, sometimes with balls instead of rollers. 

The simplest swivel bearing is the bushing bearing, 

which is just a bush sandwiched between the wheel and the axle.

This design was later replaced by rolling bearings, which replaced the original bushings with many cylindrical rollers, each rolling element acting like a separate wheel. 

Due to the difference in manufacturing accuracy and material uniformity, even the same batch of bearings of the same material and size are used under the same working conditions, 

and their service life is not the same..

Bearing plays a vital and irreplaceable role in mechanical design, and it involves a very wide range. It can be understood that without bearings, the shaft is just a simple iron rod. 

The following is a basic introduction to the working principle of bearings. 

Rolling bearings developed on the basis of bearings, whose working principle is to replace sliding friction with rolling friction, generally 

consist of two rings, a set of rolling elements and a cage, which are highly versatile, standardized and highly 

serialized Mechanical base parts. Due to the different working conditions of 

various machines, various requirements are put forward for rolling bearings in terms of load capacity, 

structure and performance. For this reason, rolling bearings require various structures. However, the most basic structure is composed of inner ring, outer ring, rolling elements and cage - 

often referred to as the four major parts.