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INA Bearings and Their Lubrication Methods:

Source:  skf bearing  Time:  2020-05-22

The INA bearing is a kind of bearing that adopts the lubrication method of thin grease and oil mist, and is an important part in contemporary mechanical 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.


German INA bearing products are involved in industries including: agricultural machinery industry, construction industry, hydraulic and wind engineering industry, construction machinery industry, machine tool and manufacturing machinery industry, material processing and packaging industry, port engineering industry, power tool industry, gearbox industry, Semiconductor industry, pump and fan industry, industrial robot and automation industry, rubber, plastic and chemical industry, textile industry, tractor industry, woodworking machinery industry, etc. In these industries, German INA bearings have been widely used.
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Lubrication method:

General working INA bearings use thin grease and oil mist lubrication. These lubrication methods have their own characteristics. However, to meet the working requirements of modern high-speed and high-load work roller bearings, oil vapor lubrication is more suitable.

Lubrication has an important impact on the fatigue life and friction, wear, temperature, vibration, etc. of the INA bearing. The most outstanding feature of the ceramic bearing cannot work without normal lubrication. Analysis of the cause 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 oil-air lubrication is used, the actual working life of the work roller bearing has been significantly improved, and the wear and damage of the rolling work 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. After re-installation of the inspected bearing, the load-bearing area should be replaced (that is, the outer ring should be rotated 90 degrees before matching with the bearing seat).
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Under the conditions of high speed and high temperature, oil lubrication can be used when grease lubrication is no longer suitable for the adjustment scheme of INA bearing combination position and clearance. 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 under bearing operating temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricants include mechanical oil, high-speed mechanical oil, steam turbine oil, compressor oil, transformer oil, cylinder oil, etc.

INA bearings have increased internal clearance due to wear during operation. The increase of the bearing clearance will cause the bearing's internal load-bearing area to decrease and the running noise to increase. Therefore, when considering the reuse standard of bearing clearance, the bearing with increased clearance should be first allowed according to the working conditions of the host.
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