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How much do You Know about Air Bearings

wallpapers Innovations 2020-02-19
Bearing, I believe everyone will not be unfamiliar; it is an integral part of contemporary mechanical equipment. In the early form of linear motion bearing, a row of wooden poles was placed under a row of skid plates. Modern linear motion bearings use the same working principle, but sometimes balls are used instead of rollers. The most straightforward rotating bearing is the sleeve bearing, which is just a sleeve sandwiched between the wheel and axle. This design is then replaced by rolling bearings, which use a lot of cylindrical rollers instead of the original bushes. Each roller is like a separate wheel.


So when did the air bearing start?
In 1854, the French G.A. Ian put forward the idea of using gas as a lubricant. In 1896, the first air bearing came out. Air bearing, as the name implies, the most commonly used gas lubricant for bearings using gas as oil is air, and nitrogen, argon, hydrogen, helium, or carbon dioxide can also be used as required. In the gas compressor, expander, and circulator, the working medium is often used as a lubricant. In the selection of air bearing materials, there are mainly tool steel, bronze, tungsten cobalt molybdenum alloy, powder metallurgy porous materials, ceramics, and engineering plastics, etc.
The bearing mechanism of gas lubricated bearing is the same as that of liquid lubricated bearing, which can be divided into the gas hydrodynamic bearing and gas hydrostatic bearing. Gas dynamic pressure bearing: it uses the dynamic fluid pressure produced by gas in wedge space to support the load. The shallow thread groove is usually made on the surface of the journal or bearing bush, and the bearing capacity is improved by the pump action of the slot. Pneumatic spiral groove thrust bearing: pneumatic spiral groove thrust bearing. Aerostatic bearing: generally, the air supply pressure of aerostatic bearing shall not exceed 0.6MPa. The gas enters the air chamber through the air supply hole, and then comes the clearance between the bearing and the journal through the throttler, and then flows out of the bearing from both ends, forming a static pressure air film supporting the load in the clearance. Generally, the inner hole surface of aerostatic bearing does not have an air cavity to increase the film stiffness and improve the stability.

Compared with liquid lubricating oil-bearing, this kind of gas lubricating oil-bearing also has many advantages, such as low friction, a wide range of application speed, a wide range of application temperature, low bearing capacity, etc.. Still, it is inevitable that it also has high requirements for processing accuracy, and more attention should be paid to the detection of bearing in advance and afterward.

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Tag: bearing   air bearings