In the late 18th century, H.R. herz of Germany published a paper on contact stress of ball bearings. On the basis of Hertz's achievements, r. streibeck of Germany and a. palmgren of Sweden carried out A large number of experiments, which contributed to the development of the design theory of rolling bearings and the calculation of fatigue life. Later, Russian N.P. petrov applied Newton's laws of viscosity to calculate the friction of bearings. The first patent for the ball channel was granted by Philip vaughn of carmarthen in 1794.
In 1883, friedrich fischer laid the foundation of the bearing industry by proposing the use of suitable production machines to grind steel balls of the same size and with accurate roundness. British o. Reynolds made mathematical analysis of thor's discovery and derived Reynolds equation, which laid the foundation of hydrodynamic lubrication theory.
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