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In operation, the rolling road sound after the source is affected by load rings due to inherent vibration. Due to the elasticity of the rings and rolling contact form non-linear vibration system. When lubricating or when accuracy is not high, it fires associated with the elastic characteristics of natural vibration, pass into the air, it becomes noise. As we all know, is the adoption of the most advanced manufacturing technology and processing components of TIMKEN bearing, varying degrees of its surface there is always small geometrical error so that the fluctuations between the raceways and rolling elements stimulating vibration inherent vibration.
KOYO bearings bearing inherent vibration caused by external incentives, means the bearing inner ring, the natural vibration of outer ring, rolling elements and cage.
Due to movement pieces each other contact collision and caused of forced vibration, including due to scroll body not ideal of sphere, both inside and outside Groove road contact points movement of track not ideal round (round degrees, and corrugated degrees), and scroll surface not ideal of smooth surface (rough degrees) and scroll body and keep frame in movement in the of collision and lubricant in of impurities, caused of forced vibration, vibration and sound has close of relationship.
General INA bearing, recommended concentrate its limited human and financial resources to improve vibration control. Noise should not be separate quality standards, according to experience, for special products, such as computer hard drives, video disc drive system bearings, not easy when using vibration test, standard for noise measurement method could be developed to assess.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4976 NTN | 380 | 520 | 140 |
| NNU4972K NTN | 360 | 480 | 118 |