An early example of a ball bearing was found on an ancient Roman ship built in 40bc in lake nami, Italy: a wooden ball bearing used to support a rotating table top. Leonardo Da Vinci is said to have described a ball bearing around 1500. Among various immature factors of ball bearing, one of the most important is that the balls will collide with each other, causing additional friction. But this can be prevented by placing the ball in a small cage. In the 17th century, Galileo made the earliest description of "cage ball" ball bearing. At the end of the 17th century, British c. varlow designed and manufactured ball bearing, and put it on a mail truck for trial, and British p. worth obtained the patent of ball bearing. The first practical rolling bearing with a retainer was invented by clockmaker John harrison in 1760 to make the H3 timepiece. H.R. Hertz of Germany published a paper on contact stress of ball bearings at the end of the eighteenth century. On the basis of herz's achievements, Germany's r. streibeck, Sweden's a. pamgren and others carried out A large number of tests, which contributed to the development of the design theory and fatigue life calculation of rolling bearings. Subsequently, N.P. petrov of Russia applied Newton's law of viscosity to calculate bearing friction. The first patent for a ball groove was obtained by Philip vaughn of camarson in 1794.
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