Bearings in the mechanical transmission process from the fixed and reduce the load friction coefficient of the components. Sliding self-lubricating bearings when other parts move relative to each other on the shaft are used to reduce the friction coefficient during power transmission and keep the parts fixed in the middle of the shaft. Bearing is an insignificant part of modern machinery and equipment. Its main function is to support the mechanical rotating body, to reduce the mechanical load friction coefficient during the transmission of the equipment.
China is one of the earliest oil-free bearings in the world to create rolling bearings. In Chinese ancient books, the structure of axle bearings has long been documented. Bearings are important basic parts of various types of machinery and equipment, its accuracy, function, life and reliability of the host accuracy, function, life and reliability play a decisive role. In mechanical products, the bearings are classified as high-precision goods, which not only requires the induction and support of many academic disciplines such as mathematics and physics, but also needs material science, heat treatment technology, fine processing and measurement technology, numerical control technology and useful numerical methods and powerful computers Technology and many other disciplines to serve, so the bearing is a representative of the national scientific and technological strength of the commodity.