Oil-free bearings mainly include gas-lubricated bearings, composite lubricated bearings, and water-lubricated bearings.
First, gas lubrication bearings:
Gas-lubricated bearings are gas-lubricated sliding bearings. The most common gas lubricant is air, and if necessary, nitrogen, argon, hydrogen, helium, or carbon dioxide can also be used. The mechanism by which a gas-lubricated bearing forms a bearing film is the same as a liquid-lubricated bearing. Gas lubricated bearings utilize the gas's transportability, diffusivity, viscosity and thermal conductivity, adsorbability, and compressibility. They are formed between friction pairs under hydrodynamic, hydrostatic, and squeeze effects. A complete film, with support load, reduce friction function.
Gas-lubricated bearings are generally classified into three types: gas dynamic pressure bearings, gas hydrostatic bearings, and gas extrusion bearings. The lubricating state of the actual bearing is often in the form of dynamic and static pressure, dynamic, extrusion, static, extrusion, and dynamic, static, and mixed lubrication. The mechanism by which a gas-lubricated bearing forms a bearing film is the same as a liquid-lubricated bearing.
Second, composite materials lubrication bearings
Due to the requirements of special production processes, certain key equipment of industrial and mining enterprises are operating under extremely harsh conditions. Due to heavy equipment, high ambient temperature, large dust or acidic gases in the air. Lubrication of the equipment brings many problems, and the friction and wear are serious. Most of the current lubrication oils are still lubricated with traditional oils and greases. In fact, these industrial and mining conditions have exceeded the range of oil and grease lubrication. Bearings and other friction pairs can easily occur. Biting or biting. Causes severe parts wear and damage, often resulting in equipment outages.