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Designed by INA bearings structures as determined by the parameters of steel, flexibility, quality, posed by damping vibration system under operating conditions will result in a commensurate and mechanical vibration. Operating conditions such as installation conditions, speed, axial load borne by direction, values, and so on.
The vibration caused by variation in the manufacturing process, deviations smaller, smaller the vibration. Steel ball roundness, surface waviness and surface roughness are the factors having the greatest effect on vibration of bearing parts, followed by the inner ring and outer ring raceway surface roughness and shape errors of again for bearing cleanliness and quality of lubricants.
Fatigue failure was a failure of the bearing surface form, mainly for fatigue crack initiation and extension and fracture process, the long-term effects of alternating load resulting from failure of metal. Cracks in two ways:
1: from surface Shang see, this is, bearing in scroll contact process in the, due to in work surface of plastic deformation and strain hardened surface of contact stress cyclical changes by caused of external load of role, and finally in small crack from development of within surface, in both Zhijian of surface crack of formed, due to work surface of lobby doors wedged into lubricant, open of power, severe against in wall Shang, forced crack forward advance;
2 from the layer, under repeated pressure, surface contact, initial cracking at exposed places on the surface of some depth of cracks, surface direction and point of view, to a certain depth from surface of contact surface, and go beyond the surface, corrosion and eventually split, leaving a Ma Hang.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4922 NTN | 110 | 150 | 40 |
| NNU4921K NTN | 105 | 145 | 40 |