four point contact ball slewing bearing the introduction

China is the world's one of the earlier invention of four point contact ball slewing bearing, in ancient books in China, there is a record of earlier about the structure of the axle bearing. Seen from archaeological objects and data, China's oldest bearing with modern rolling bearing structure shape, appeared in the 221 ~ 207 BC, the qin dynasty) this permanent economic county in Shanxi Province cliff village, xue family. After the founding of new China, especially since the 1970 s, under the strong push of reform and opening to the outside, the bearing industry has entered a brand new high quality rapid development period.

In the late 17th century, British c. tile design and manufacture of miniature linear bearings, and in a coach on the trial and the p. worth taken out a patent on ball bearings. In Germany at the end of the eighteenth century H.R. Hertz published papers about the ball bearing contact stress. In Hertz achievement, on the basis of Germany's r. a. terry baker, Sweden PAM glen and others A lot of tests have been carried out, to develop the design of the rolling bearing theory and fatigue life calculation. Subsequently, the Russian N.P. petrov Newton's law of viscosity are used to calculate the bearing friction.

Britain's o. Renault mathematical analyses of thor's findings, the Reynolds equation is derived, from then on, laid the foundation of hydrodynamic pressure lubrication theory. Early forms of linear motion bearings, is a row under the pry plate placed a row of wooden poles. This technique may can be traced back to build the great pyramid of giza, while no clear evidence. Modern linear motion bearings is using the same principle, but sometimes a ball instead of roller. The earliest of sliding and rolling element bearing is made of wood. Ceramic or glass, sapphire, also have use, steel, copper and other metals, plastics, such as nylon, bakelite, fluoro lung and UHMWPE) have been widely used.