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Origin of bearing
Source: | Author:hkw2e7f0c | Publish time: 2020-06-08 | 83 Views | Share:

China is one of the countries that invented rolling bearing earlier in the world. In ancient Chinese books, the structure of axle bearing has been recorded for a long time. According to archaeological relics and materials, the oldest bearing with the prototype of modern rolling bearing structure in China appeared in 221-207 BC (Qin Dynasty) in xuejia Village, Yongji County, Shanxi Province. After the founding of new China, especially since the 1970s, the bearing industry has entered a new period of high quality and rapid development under the strong impetus of reform and opening up.

At the end of the 17th century, England's C. Wallow designed and manufactured ball bearings, which were tested in mail cars and the British P. Worth patented the ball bearing. At the end of the 18th century, H.R. Hertz of Germany published a paper on contact stress of ball bearings. On the basis of Hertz's achievements, R. Striebeck of Germany and A. Palmgren of Sweden conducted A large number of experiments and made contributions to the development of rolling bearing design theory and fatigue life calculation. Then N.P. Petrov of Russia applied Newton's law of viscosity to calculate the friction of bearings. Britain's O. Raynor made a mathematical analysis of Toll's discovery and derived the Reynolds equation, thus laying the foundation of hydrodynamic lubrication theory.

The early form of linear motion bearings consisted of a row of rods placed under a skid. This technique may date back to the construction of the Great Pyramid of Giza, although there is no clear evidence for it. Modern linear motion bearings use the same principle of operation, but sometimes in place of roller ball. The earliest sliding and rolling bearings were made of wood. Ceramics, sapphires, or glass are also used, and steel, copper, other metals, and plastics (such as nylon, Formosa, Teflon, and UHMWPE) are commonly used.