Oilless Bearing mainly includes gas lubricated bearings, composite lubricated bearings, water-lubricated bearings, etc.
1. Gas-lubricated bearings:
Gas-lubricated bearings are sliding bearings that use gas as a lubricant. The most commonly used gas lubricant is air, and nitrogen, argon, hydrogen, helium, etc. can also be used as needed. The mechanism of the gas-lubricated bearing to form a bearing gas film is the same as that of the liquid-lubricated bearing. Gas-lubricated bearings make use of gas transmission, diffusivity, viscosity and thermal conductivity, adsorption and compressibility. It forms a complete air film between the friction pairs under the effect of hydrodynamic pressure, static pressure and squeezing effect, which has the function of supporting a load and reducing friction.
Gas-lubricated bearings are generally divided into three types: gas dynamic pressure bearings, gas static pressure bearings and gas squeeze bearings. The actual lubrication state of the bearing often exists in the form of dynamic, static pressure, dynamic, extrusion, static, extrusion, and mixed lubrication of dynamic, static and extrusion. The mechanism of the gas-lubricated bearing to form a bearing gas film is the same as that of the liquid-lubricated bearing.
2. Composite lubricated bearings
Due to the requirements of special production processes, some key equipment of industrial and mining enterprises operates under extremely harsh working conditions. Due to the heavy equipment, high ambient temperature, large dust or acid corrosive gas in the air, etc. There are many problems to the lubrication of the equipment, and the friction and wear are serious. At present, most of the traditional oil and grease lubrication is still used. In fact, these industrial and mining conditions have exceeded the scope of oil and grease lubrication. It is extremely prone to bite or seizure of bearings and other friction pairs. Cause severe wear and damage of parts, often resulting in equipment outages.
The composite material used in the composite lubricated bearing is a new type of extreme pressure solid lubricating material, which is composed of a metal substrate and a solid lubricant paste embedded in the hole or groove of the substrate. The metal substrate bears most of the load during the friction process. After friction, the solid lubricant in the hole or groove is transferred or reversely transferred to the friction surface, and a solid transfer film with good lubrication, firm adhesion and uniform coverage is formed on the friction surface, which greatly reduces friction and wears. As the friction progresses, the embedded solid lubricant is continuously provided on the friction surface, ensuring good lubrication of the friction pair during long-term operation.
3. Water-lubricated bearings
Since the emergence of the oil resource crisis in the 1970s and people's attention to environmental protection in recent years, hydraulic transmission technology has faced severe challenges, and water-lubricated bearings have gradually been promoted and applied. Water-lubricated bearings use water as the lubrication and working medium, which not only saves a lot of oil but also avoids environmental pollution to traditional bearings that use oil as the lubricating medium. At the same time, water has the advantages of being non-polluting, wide sources, safety and flame resistance, etc., and it is an ideal lubricating medium. It can also reduce the friction, wear, vibration, noise, non-functional consumption and other key problems of the friction pair. Therefore, the research of water-lubricated bearings has important theoretical research and application value for improving mechanical efficiency and protecting the environment and has become a hot spot in various countries.
Jiashan Minqin Oilless Bearing Co., Ltd. is an Oilless Bearing Manufacturers, welcome to visit our official website.