1, INA bearings and shafts and shell holes combined with tension causes the variation of the bearing clearance. General bearing after installation make the clearance values reduced;
2, INA bearings in institutions in the process, because of the different thermal conditions of the axis with the shell, the temperature difference between inner and outer rings, which will lead to reduction in clearance values;
3, due to shaft and housing materials for different coefficients of expansion, will lead to the clearance values reduces or increases.
　　Typically selects the most appropriate operational clearance value of radial bearings bearing clearance is set forth in the standard basic set clearance value. Basic Group clearance values apply to General working conditions should be preferred. For radial spherical plain bearings working under special conditions when you cannot use basic clearance, the choice of auxiliary group clearance values. Such as deep groove ball bearings, 3rd, 5 groups of clearance values, apply to bearings and shafts and shell holes than normal tie in with a tight interference fit or work INA bearing inner ring and outer ring of large temperature difference in mechanical parts. Centre the axis and inclination of large shell hole center line, and in order to increase their axial load carrying capacity, improve bearing limit speed, as well as reducing the INA under the condition of bearing friction can be adopted, 3rd, 5 clearance values. Requirements for rotating axis of precision or limit the axial play, generally uses the 2nd set clearance value (small clearance values) of the INA bearing, if necessary, give a certain amount of preloading "preload", to increase the rigidity of the shaft.
1, INA bearing surface injury: iron found in the spectrum of cutting abrasive, abrasive compositions for non-ferrous metals.
2, INA bearings axial shaft neck surface corrosion: spectral analysis of iron concentrations found exceptions, many of ferrographic iron composition of submicron particles, lubricant excessive moisture or excessive acid.
3, INA bearing surface corrosion: spectral analysis found non-ferrous metal elements concentration exception; iron spectrum appears in a number of non-ferrous metal components of sub-micrometer-diameter wear particles; lubricant excessive moisture, excessive acid.
4, INA bearing back fretting wear: spectral analysis found INA bearing iron concentration of exceptions, many of ferrographic submicron wear particles of iron components, lubricants water and acid value exception.
Liquid lubrication, sliding surfaces separated by lubricating oil without direct contact, can also significantly reduce friction losses and surface abrasion, oil film also has a vibration-absorbing capacity
5, INA bearing surface of neck injury: ferrography is cutting abrasive or black iron oxide particles, metal surface temper.



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