The early linear motion bearing form is to place a row of wooden poles under a row of pry plates. Modern linear motion bearings use the same working principle, but sometimes the ball instead of the rollers. The simplest rotating bearing is the sleeve bearing, which is just a bushing between the wheel and the axle. The design is then replaced by rolling bearings, which replace the original bushing with many cylindrical rollers, each of which is like a single wheel.
An example of an early ball bearing was found on an ancient Roman vessel found in the Italian nano Lake in 40 BC: a wooden ball bearing is used to support rotating desktops. It is said that Leonnado Dar Finch had a description of a ball bearing in the past 1500 years or so. Among the various immature factors of bearings, it is very important that the ball will collide and cause additional friction. But you can prevent the phenomenon by putting the ball in a small cage. Galileo made the earliest description of the ball bearings of "cage-loaded balls" in 17th century. At the end of 17th century, the British c. WA Luo Danba designed and manufactured ball bearings, which were fitted on a mail trail and patented by British p. The earliest practical application of a rolling bearing with a cage was invented by watchmaker John Harrison in 1760 to make a H3 chronograph. At the end of 18th century, Germany's H.R Hertz published a paper on contact stress of ball bearings. On the basis of Hertz achievement, Germany's R. Striebeck, Sweden's a. Pamglen and other people carried out a large number of experiments on the development of rolling bearing design theory and fatigue life calculation made a contribution. Subsequently, the Russian N.P. Petrov uses Newton's viscosity law to calculate bearing friction. The first patent on the fairway was obtained by Carmarthen Philippe Wahn in 1794.
In the 1883, Friedrich Fischer proposed the use of suitable production machines to grind the same size, roundness accurate steel ball proposition, laid the foundation of the bearing industry. The discovery of Thor was analyzed mathematically by the British O. Reynolds, and the Reynolds equation was deduced, and the foundation of hydrodynamic lubrication theory was laid.
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