solid bushing, bronze with lubricant plugs embedded
solid bushing, bronze with lubricant plugs embedded runs in the early stage of bearing surface of the solid lubricant rub against each other to form transfer film and coated to eventually form solid lubrication film on the ring to achieve self lubrication effect, it direct contact between the partition of the artifacts which was very good protection of grinding extend the service life of the bushing bearing and workpiece, has a large bearing capacity, high dimensional accuracy.
The metal composite bearing is made of high-quality metal material with porous bronze powder in the middle. The surface is covered with wear resistant material mainly PTFE as the working surface of the bearing. The middle copper powder layer provides high heat conduction, so the heat generated by the bearing can be transferred quickly, and the dry friction working condition can be designed. Simplified design with superior wear resistance and very low friction coefficient.
Plastic bearing because of the use of modified self-lubricating plastic injection molding solid its whole is lubricating material, light weight, corrosion resistance, good wear resistance.
The biggest role of bearings is to reduce friction resistance, to put it bluntly, is to save effort. As many of us have experienced, we can easily tow a large ship floating on the water, but it is very difficult to tow a small boat stranded on the shore. In this case, it’s the frictional resistance.
The first condition for friction is for two objects to come into contact. There are two ways of contact, one is face-to-face contact, the other is point-to-surface contact. The first way is like rubbing your hands. It has a high frictional resistance and generates a lot of heat. This is called sliding friction. The second way is just like the ball rolling on the ground, with less friction and faster rolling speed. This way is called rolling friction. Secondly, the material of the contact surface and the weight of the moving object also affect the frictional resistance, which we will discuss later.
To get back to the point, the previous nonsense is to lead to today’s topic, we would like to say that the development history of bearings. The academic world is divided as to who invented the first bearing, and I do not comment. The past is a story, just listen to a good, do not have to tangle too much.
First of all, the ancestors in life gradually groped out the law of friction. For example, dragging prey or large stones from the ground can be very laborious, but if logs are laid under the prey or stone, it can be very easy to pull. This seemingly simple improvement is actually great progress in the history of human development, indicating that human beings have discovered the secret of friction, and can transform sliding friction into rolling friction, so as to achieve the purpose of saving effort.
Archaeologists excavating the site of Nineveh in Mesopotamia discovered a mural (FIG. 1) in a tomb depicting the removal of a giant stone statue. The giant statue appears to have been placed on a “ship,” with a tow rope at the front and back of the ship, which was pulled by a crowd to move the statue. It is worth noting that logs were scattered under and around the ship. You can imagine that these logs are actually used as pillow rails to reduce friction.
FIG. 1 Mural in Nineveh
The above method, which USES logs as sleeper rails to carry heavy loads, is similar to the flat needle roller bearings we still use today (Figure 2). The so-called plane needle roller bearing is to fix the needle through the retainer. This kind of bearing is usually placed between two planes, which can transform the sliding friction between plane and plane into the rolling friction between point and plane.
FIG. 2 Plane needle roller bearing
However, this kind of plane bearing is quite different from the bearings we usually recognize. Most people think that bearings should be round and can be rotated. This view may be more representative, but when did the bearing first appear? There are several different points of view, and I will briefly introduce them. First, it was believed that the earliest bearings were those used on the axles of horse-drawn carriages, as evidenced by some archaeological finds. Secondly, it is believed that the ancient axle bearing is different from the modern bearing in structure. Considering the similarity of structure, the bearing used in “simplified instrument” is more similar to the modern bearing. “Jian Yi” is an astronomical observation instrument in ancient China, its inventor can not be tested, but the maker is Guo Shoujing. You can find a very detailed introduction on the Internet, but I won’t go into more details here. To reduce friction, the device incorporated four “circular shafts” (or cylindrical rollers) between the “bezel” and the “equatorial ring,” creating the first cylindrical roller bearings, 200 years before Da Vinci designed the roller bearings.
So that’s before the Industrial Revolution, and then you get to the industrial Revolution.
In 1794, inventor Philip Vaughan received a patent for a ball bearing for use on the axle of a horse-drawn carriage.
In 1795, Rexroth, the world’s first professional manufacturer of bearings, was founded in Heimbuchenthal, Germany. Today, the company is still full of vitality. In 1987, Rexroth acquired Deutsche Star GmbH and successfully developed the linear guide market. In 2001, Rexroth reached a merger agreement with Robert Bosch GmbH and the two companies were renamed, Bosch Rexroth.
For nearly 50 years after 1795, bearing development entered a stage of stagnation due to the slow progress of the Industrial Revolution. Until the middle of the 19th century, with the surge of bearing demand, the related research showed a blowout trend. Here are some of the findings from this period.
(1849) New Research on the Friction of Solid bodies, Comptes Rendus, 28, p.290
(1855) Studies on the main phenomena That are General media and on the various ways of today’s value mechanics of the Materials Used in Engine Lubrication, Bulletin DE La Societe Industrielle DE Mulhouse, 26, p.202
(1855) Notice on the laws of Caloric output by Friction Media, Bulletin DE la Societe Industrielle DE Mulhouse, 26, p.238
(1862). Mechanical Theory of Heat, (Paris, Lieber)
(1863). Exhibition Analytical and Experimental Theory of Heat, (Paris, Mallet Bachelet)
(1887) The thermodynamics and The Work of Living Beings, Revue Scientifique,22, May (Paris, Bureau Journals), P.673-684
In 1869 Michaux et Cie (Michaux and Company) adopted the inventor Jules Suriray’s patent for bearings, which led to the first installation of a radial ball bearing in a bicycle and the world’s first cycling road race.
Pierre Michaux and his bike
In 1881, German scientist Hertzian Contact Stress Theory was put forward by Hertzian, which opened a new chapter of bearing mechanics analysis.
In 1883 the FAG Company was formally established. In 1912, FAG pioneered the introduction of single-row roller bearings. 2001 FAG, INA, and FUK merged and were renamed Schaeffler Group.
In 1883, N.P. Petrov calculated bearing Friction Friction in Machines and the effect of the lubricant, St.Petersburg
In 1886 Osborne Reynolds (O.R Eynolds) proposed the Reynolds equation, which laid the foundation for hydrodynamic lubrication theory
In 1899, Timken was founded. The company obtained a patent for tapered roller bearings in 1898 and is still the leader in tapered roller bearings today.
In 1907, the SKF company was established. The automatic self-aligning double row ball bearings used in textile machinery are introduced
Self-aligning double-row ball bearing
SKF’s office in Canada in 1940
In 1916, NSK, the first Japanese manufacturer of ball bearings, was established
NSK factory in 1916
In 1923, Schneeberger was founded in Switzerland and developed the first linear guide rail in the world. In 1945, the world’s first grinding machine with cross roller guide was produced.
In 1924, a. Palmgren published the method of life expectancy prediction and in 1945, M.A. Miner expanded it, and finally formed the palmgren-miner rule.
In 1938, the tile shaft was established
1950 The Ha Axis was founded (the north shift of the tile axis was founded)
In 1954, the Luochuan Axis was established (assisted by the Tile Axis)
Since then, the bearing companies of various countries have sprung up like bamboo shoots after a spring rain continuously, presenting the situation of a race for the deer, we will not go into detail here.