Study its role should be support for bearing, bearing heater but this is only part of its role in supporting its essence that the literal interpretation is to be able to bear the radial load. Also be understood as it is used to fixed axis. A fixed axis so can only achieve rotation, and control the axial and radial movement. Motor without bearing the consequences is not working. Axis may be movement in any direction, the motor work requirements shaft only rotation. Impossible to realize the role of the drive, in theory, not only that, bearing also affect the transmission must be implemented in order to reduce the impact on the high speed shaft bearing lubrication, and some bearing lubrication, called pre-lubricated bearings, and most of the bearing lubricant is responsible only increase energy consumption due to friction at high speeds, even worse, is very easy to damage the bearings. Sliding friction into rolling friction is one-sided, because the kind called plain bearings.
 
For mechanical retention mechanism. When the other parts in the shaft relative movement to keep the center of the shaft position and control the movement of parts, called bearings.
 
In ancient China, the bearing heater on the axle bearing structure has long been documented. In 1279, China's GuoShouJing created astronomical simple instrument, its role and modern thrust roller bearings similar. In 1772, British C. Vallo design and manufacture of ball bearings, mounted in the mail car trial. In 1794, the United Kingdom P. Worth the patent of ball bearings. Mid-19th century Europe with the progress of the bearing materials, lubricants and mechanical manufacturing process, began to have plain bearings. In 1881, the German HR Hertz contact stress on ball bearings paper. On the basis of the achievements in Hertz in Germany R. , Sweden A. Pam, Glenn et al conducted a large number of tests, has contributed to the development of the rolling bearing design theory and bearing heater fatigue life. In 1883, the Russian NP Petrov application of Newton's law of viscosity bearing friction, the same year the British B. Thor nuclear submarines in the determination of the bearing friction coefficient of the vehicle, the bearings are bearing oil film pressure and measure the oil film pressure distribution curve. In 1886, the United Kingdom O. Renault Bristol found mathematical analysis, the Reynolds equation is derived, from laying the foundation of the theory of hydrodynamic lubrication. 1960s, the elastic hydrodynamic lubrication theory matured greatly increase the life of the rolling bearing designed according to this theory.
 
 



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