When it comes to the origin of bearings, it can be traced back to ancient Egypt. In early forms of linear motion bearings, a row of battens was placed on the skid. This technique dates back to the construction of the Great Pyramid of Giza, although there is no clear evidence. Modern linear motion bearings use working principles, but sometimes balls are used instead of rollers.
Initial stage
From heavy-duty axle and machine tool spindle to precision watch parts, many occasions need rotating bearings. The simplest rotating bearing is a sleeve bearing, which is just a sleeve sandwiched between the axles. This design was later replaced by rolling bearings, which used a large number of cylindrical rollers instead of the original bushings. Each wheel is like a separate wheel. The earliest practical roller bearing with cage was invented by clock manufacturer John Harrison for H3 astronomical clock in 1760.
In the 17th century, Galileo first described ball bearing as "fixed ball" or "cage ball". But for quite a long time, the bearing installation on the machine tool has not been realized. The first patent for the ball raceway was in 1794. Philip Vaughan, an ironworker in camassan, Wales, uses ball bearings as the axle bearings of the wagons. From then on until the 1950s and 1960s, ball bearings were widely used in children's carousels, transmission shafts, turrets, armchairs and bicycle shafts.
Economic growth cycle
The Second World War stimulated the development of military industry. The position of bearing industry is more and more important. In addition, the rapid development of science and technology, the short-term stability of the first World War and the urgent need for weapons in the Second World War promoted the rapid growth of the world bearing industry and the increase of bearing varieties, which were widely used in automobile, aircraft, tank and armored vehicles, machine tools, instruments, meters, bicycles, sewing machines and other fields.
During the Second World War, with the modernization of the means of war, people's understanding and attention to bearings sublimated to an unprecedented level. All countries are in urgent need of bearings and are eager to establish bearing industry. As a result, there are a large number of bearing factories in various countries. It can be seen from the location of the Allied attack on Nazi Germany. The large-scale cluster bombing, which destroyed the enemy's morale and economy at one stroke, was a typical tactic of the Second World War. When they reached Germany to attack their targets, the Allies believed that in order to weaken the enemy's combat effectiveness, they must concentrate on bombing German submarine manufacturers and bases, aircraft manufacturers, bearing factories, refineries, synthetic rubber factories and vehicles. The bearing factory was designated as the main bombing target. Schweinfurt, a town with a concentration of bearing factories in Germany, was bombed twice in August and October 1943. The bombing mission was carried out by air force 8. Albert schumper, the Nazi German military minister, admitted that the bombing in August reduced German bearing production by 38%, and that the bombing in October destroyed 65% of bearing enterprises.
development
With the rapid development of high and new technologies such as aerospace, nuclear industry, electronic computer, optical electromagnetic measuring instrument and precision machinery, the world bearing industry, which embodies the level of modern science and technology, has entered a new era of comprehensive innovation and manufacturing technology.
During this period, various bearings had different USES.At present, there are ten thousand kinds of bearings.Super large bearings up to 38 meters in size and miniature bearings as small as 0.0mm.That is to say, more than the traditional single row, double row and column ball bearing, roller bearing, needle roller bearings, tapered bearings, even without lubrication bearings, self-lubricating bearings, angular contact bearings, transmission bearings, unive