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Lubrication Method Of INA Bearings

wallpapers Green Building 2020-12-03 >
INA bearing is a kind of bearing that adopts dilute grease and oil mist lubrication method, and is an important part of modern machinery and equipment. The main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. It is mainly divided into cylindrical roller bearings and self-aligning ball bearings.
 
Lubrication method
 
General working INA bearings adopt thin grease and oil mist lubrication methods. These lubrication methods have their own characteristics. However, to meet the working requirements of modern high-speed, high-load work roll bearings, oil-vapor lubrication can be considered more appropriate.
 
Lubrication has an important influence on the fatigue life and friction, wear, temperature, vibration, etc. of INA bearings. The most outstanding feature of ceramic bearings is that without normal lubrication, the bearings cannot work. Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication. Therefore, good lubrication of INA bearings is an effective measure to reduce bearing friction and wear. In addition, the lubrication of the bearing is also affected by heat dissipation, rust prevention, sealing, and impact mitigation.

 
After using oil-air lubrication, the actual working life of the work roll bearing has been significantly improved, and the wear and damage of the rolling working surface has been greatly improved compared with grease lubrication. When the bearing reaches 1/3-1/4 of its service life, it must be thoroughly cleaned and the internal clearance of the INA bearing must be measured. When the internal clearance of the bearing is greater than twice the original clearance, it should be adjusted. When the inspected bearing is reinstalled, the loaded area should be replaced (that is, the outer ring is rotated 90 degrees and then matched with the bearing seat)
 
Under high-speed and high-temperature conditions, oil lubrication can be used when the INA bearing combination position and clearance adjustment scheme is not suitable for grease lubrication. Through the circulation of lubricating oil, a lot of heat can be taken away. Viscosity is an important characteristic of lubricating oil. The size of the viscosity directly affects the fluidity of the lubricating oil and the thickness of the oil film formed between the friction surfaces. The viscosity of the lubricating oil at the working temperature of the bearing is generally 12-15cst. The higher the speed, the lower the viscosity, the heavier the load, the higher the viscosity. Commonly used lubricants include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, and cylinder oil.
 
The internal clearance of the INA bearing increases due to wear during operation. The increase in the bearing clearance will reduce the load bearing area inside the bearing and increase the running noise. Therefore, when considering the reuse standard of bearing clearance, the bearing with increased clearance should be used first according to the working conditions of the main engine.

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