The origin of the development of bearings
Release time：
2023-08-17 16:01
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An early form of linear motion bearing was a row of wooden rods placed under a row of skids. Modern linear motion bearings use the same principle of operation, except that sometimes balls are used instead of rollers. The simplest type of rotary bearing was the bushing bearing, which was simply a bushing sandwiched between the wheel and the axle. This design was then replaced by the rolling bearing, which is a bearing that replaces the original bushing with a number of cylindrical rollers, each of which acts like a separate wheel.
An early example of a ball bearing was found on an ancient Roman ship constructed in 40 B.C. found in Lake Nemi, Italy: a wooden ball bearing was used to support a rotating tabletop. Leonardo da Vinci is said to have described a ball bearing around 1500. Among the various unsophisticated elements of ball bearings is the fact that the balls can collide with each other, causing additional friction. This can be prevented by placing the balls in a small cage, and Galileo's earliest description of the "caged ball" ball bearing was given in the 17th century. At the end of the 17th century, C. Valor of England designed and manufactured ball bearings, which were mounted on mail carriages and tried out, and P. Worth of England patented the ball bearing. The first practical rolling bearing with a cage was invented by watchmaker John Harrison in 1760 for the H3 chronograph. At the end of the 18th century, H.R. Hertz of Germany published a paper on contact stresses in ball bearings. On the basis of Hertz's achievement, R. Streibeck of Germany, A. Palmgren of Sweden and others carried out a large number of tests and 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 on ball grooves was granted to Philip Vaughan of Carmarthen in 1794.
In 1883, Friedrich Fischer laid the foundations of the bearing industry with his proposition of using suitable production machines to grind steel balls of the same size and exact roundness. O. Reynolds of England mathematically analyzed Thor's discovery and derived the Reynolds equation, which henceforth laid the foundation for the theory of fluid dynamic pressure lubrication.
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Prospects for the Use Prospects of Ceramic Bearings and Ceramic Ball Bearings
Ceramic bearings and ceramic ball bearings have many excellent properties such as: self-lubricating, high temperature resistance, corrosion resistance, anti-magnetic, electrical insulation, etc., yet to be developed and utilized in a wider field, and the potential application fields are huge. High-quality high-speed ceramic ball bearings: can serve the domestic machine tool industry well.
Features of spherical plain bearings
The structure of the spherical plain bearing is simpler than that of the rolling bearing, which is mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. Joint bearings are generally used for low-speed swinging motion (ie angular motion). Since the sliding surface is spherical, it can also perform tilting motion (ie self-aligning motion) within a certain angle range. When the degree is large, it can still work normally.
Precautions for the use of deep groove ball bearings
For deep groove ball bearings, the bearing load is too small during operation, which will cause sliding between the ball and the raceway, which will become the cause of scratches. This is especially true for large deep groove ball bearings with heavy ball and cage weights. In many cases, bearings will corrode. There are many reasons for bearing corrosion. The most common factors in our daily life are the following:
How deep groove ball bearings work
Deep groove ball bearings mainly bear radial load, and can also bear radial load and axial load at the same time. When it is only subjected to radial load, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can bear a large axial load. The friction coefficient of the deep groove ball bearing is very small, and the limit speed is also high.
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