Bearing history

Bearing history：
In the seventeenth century, the British design and manufacturing ball bearings C. Vallo, and installed in the car to try and British postal P. Wirth made ball bearings patent. Eighteenth century German publication on ball bearings HR Hertz contact stress papers. On the basis of the achievements of the Hertz, Germany, Sweden, Glenn A. Pam, who have done a lot of testing, the design theory and the development of fatigue life of rolling bearings is calculated to make a contribution. Subsequently, the Russian Petrov NP Newton's law to calculate the viscous friction bearings. British Thor O. Renault were found mathematical analysis, Reynolds equation is derived, from the foundation hydrodynamic lubrication theory. The early form of linear motion bearings, is placed in a row in a row of wooden sled. This technique might be traced back to the time of the construction of the Great Pyramid of Giza, although there is no clear evidence. Modern linear motion bearings using the same kind of works, but sometimes with the ball instead of rollers. The first sliding and rolling element bearings are made of wood. Ceramic, sapphire or glass are also used, steel, copper, other metals, plastics  have been widely used. From the heavy-duty vehicle axle and spindle to precision watch parts, many occasions require rotating bearings. The easiest is rotating bearing sleeve turbocharger bearings, it's just a clip in the bush between the wheels and axles. This design is then Rolling alternative is to use a lot of cylindrical roller bushings replace the original, each rolling element as a single wheel. Rolling with the earliest practical input cage is clockmaker John Harrison in 1760 for the production of H3 timing meter invention. Aboard a Roman ship found in the Italian lake nm, found examples of early ball bearings. The wooden ball bearings are used to support rotating desktop. The ship was built in 40 BC. It is said that Leonardo da Vinci around 1500 had been to a ball bearing is described. Ball bearings of various immature factors, there is a very important point is that a collision will occur between the ball, causing additional friction. But you can put the ball into a small cage to prevent this phenomenon. 17th century, Galileo "fixed ball" or "caged ball" ball bearing did the earliest descriptions. But then for a long time, install the sealed angular contact ball bearing has not been achieved on the machine. The first patent on ball channel is Carmarthen Philip Vaughan in 1794 obtained. In 1883, Friedrich Fischer proposed the use of appropriate production grinding machine of the same size, roundness accurate idea of the ball. This laid the foundation for the creation of an independent industrial bearings.