It can also be said that when other parts on the shaft move relatively, it is used to reduce the friction coefficient in the process of power transmission and keep the center position of the shaft fixed. Bearing imported from Japan is an important part of modern mechanical equipment. Its main function is to support the mechanical rotating body, so as to reduce the friction coefficient of mechanical load in the transmission process of equipment. According to the different friction properties of moving parts, bearings imported from Japan can be divided into rolling bearings and sliding bearings imported from Japan.
China is one of the first countries in the world to invent rolling bearings imported from Japan. In China's ancient books, the structure of axle bearings imported from Japan has been recorded for a long time. According to archaeological relics and materials, the earliest Japanese imported bearing with the rudiment of modern rolling Japanese imported bearing structure in China appeared in Xuejiaya Village, Yongji County, Shanxi Province from 2265438 BC to 207 BC. After the founding of New China, especially since 1970s, with the strong promotion of reform and opening up, the Japanese imported bearing industry has entered a brand-new high-quality and rapid development period. /kloc-at the end of 0/7th century, C. Wallow of Britain designed and manufactured bearings imported from Japan, and put them on a mail truck for trial use. P. Worth of Britain obtained a patent for bearings imported from nsk of Japan. /kloc-at the end of the 8th century, H.R. Hertz of Germany published a paper on the contact stress of bearings imported from Japan. The early form of linear motion bearings imported from Japan was to place a row of wooden sticks under the pry plate. This technology may be traced back to the construction in great pyramid of giza, although there is no clear evidence. Modern linear motion bearings imported from Japan also use the same working principle, but sometimes balls are used instead of rollers.
In 1883, Friedrich Fisher put forward the idea of using a suitable production machine to grind steel balls with the same size and accurate roundness. This laid the foundation for the establishment of an independent Japanese imported bearing industry.
1895, Henry Timken designed the first tapered roller bearing imported from Japan. Three years later, he obtained a patent and established Timken Company.
1907, Sven Wingqvist of Japan imported bearing factory designed the earliest modern self-aligning ball imported from Japan.