Roll say source by load is the natural vibration caused by the collar. Due to the contractor and the flexibility of the roller contact form nonlinear vibration system. When the lubrication or machining accuracy is not high, the elastic characteristics to arouse and the natural vibration, and transfer to the air is a noise. As is known to all, even adopt the contemporary most superb manufacturing technology processing NSK bearing parts, the working surface will always have different degrees of tiny geometric errors, so that groove roller slight fluctuations stimulate the generation between vibration natural vibration system.
Although NSK bearing groove noise is inevitable, but can take precision machining parts work surfaces, the correct choice of NSK bearings and accurate NSK bearings to use noise vibration reduction.
Roll say is because NSK bearing rotates in groove roller roll and stimulate the a steady and continuous noise, only when the pressure level or voice to cause people to pay attention to greatly. Actually get say that invoke the sound energy is limited, as in normal circumstances, the high quality 6203 NSK bearings rolling say 25 to 27 dB. This noise to bear radial load of a single deep groove ball bearings for the most typical, it has the following features:
A. noise, vibration is random;
B. vibration frequency in 1 kHz above;
C. No matter how to change speed, the noise frequency almost the same and pressure level with the speed increases;
D. when radial clearance increases, the pressure level increased sharply;
E.N SK bearing rigidity increases, the lower the total pressure level, even if the speed increases, its total pressure level increases a little;
F. lubricant viscosity, the higher the pressure level is low, but for grease lubrication, the viscosity of the shape of the fiber, soap size all can affect noise value.
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