Raceway sound excitation due to the rotation of the NSK bearing rolling element raceway rolling out a smooth and continuous noise, to draw attention only when its sound pressure level or tone greatly when. In fact, the raceway sound inspired by the sound energy is limited, such as under normal circumstances, quality 6203NSK bearing raceway sound is 25 ~ 27dB. This noise in order to withstand the radial load single row deep groove ball NSK Bearings for the most typical, it has the following characteristics:
(a) noise, vibration is random;
(b) the vibration frequency at 1kHz or more;
(c) regardless of speed of changes in the noise frequency is almost unchanged while the sound pressure level is increased with the speed and improve;
(d) when the radial clearance increases, the sound pressure level is dramatically increased;
(e).NSK bearing rigidity increases, the lower the total sound pressure level, even if the speed increases, the total sound pressure level is also small extra cost;
(f) the higher the lubricant viscosity, the lower the sound pressure level, but for the grease lubrication, viscosity, soap fiber shape and size can affect the noise value.
The raceway sound source is the subject of the inherent vibration of the ring after the load. Due to the elasticity of the ring and rolling element contacts constitute a nonlinear vibration system? Lubrication or processing accuracy is not high will be excited about this flexibility characteristics inherent vibration, transfer into the noise into the air. Well known that even the highest levels of contemporary manufacturing technology and processing NSK bearing parts, the work surface there will always be varying degrees of small geometric errors, so that tiny fluctuations in the raceway and rolling element to stimulate the natural vibration of the vibration system.
NSK bearing raceway noise is inevitable, however, can be taken to the surface of high-precision machining parts, the correct selection NSK Bearings and precise use of NSK Bearings so NVH.



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