Bearings are often used after coating. Coating can make the service life of bearings longer and meet the requirements.

        Of course, under different production environments, the requirements for bearing coating are also different. Sometimes it requires wear resistance, sometimes it requires high temperature resistance. Sometimes it is required to be ink resistant.

        China is one of the countries that invented rolling bearing earlier in the world. In Chinese ancient books, the structure of axle bearing has been recorded for a long time.

    According to archaeological relics and data, the oldest bearing with the rudiment of modern rolling bearing structure in China appeared in xuejiaya village, Yongji County, Shanxi Province from 221 to 207 B.C. (Qin Dynasty). After the founding of new China, especially since the 1970s, with the strong promotion of reform and opening up, the bearing industry has entered a new period of high quality and rapid development. At the end of the 17th century, C. wallow of England designed and manufactured the ball bearing, which was installed on the mail car for trial use, and P. worth of England obtained the patent of the ball bearing.

        At the end of the 18th century, H.R. hertz of Germany published a paper on the contact stress of ball bearings. On the basis of Hertz's achievements, R. Stribeck of Germany and a. palmgren of Sweden have carried out a large number of experiments, which have contributed to the development of design theory and fatigue life calculation of rolling bearings. Subsequently, N.P. Petrov of Russia applied Newton's viscosity law to calculate bearing friction.

        O. Reynolds of England made a mathematical analysis of Thor's discovery and derived Reynolds equation, which laid the foundation of hydrodynamic lubrication theory. In the 50 years since the founding of the people's Republic of China, China's bearing industry has made remarkable achievements.

        It can also be understood that it is used to fix the shaft. It is to fix the shaft so that it can only rotate and control its axial and radial movement. The result of motor without bearing is that it can't work at all. Because the shaft may move in any direction, and the motor requires that the shaft can only rotate.

       Theoretically speaking, it is impossible to realize the function of transmission. Not only that, the bearing will also affect the transmission. In order to reduce this influence, good lubrication must be realized on the bearing of high-speed shaft. Some bearings have lubrication, which is called pre lubrication bearing, while most bearings must have lubricating oil. When the load is running at high speed, the friction will not only increase energy consumption, but also increase energy consumption It's very easy to damage the bearing. It is one-sided to change sliding friction into rolling friction, because there is something called sliding bearing.