Analysis of the characteristics of the raceway noise of NSK bearings

Source: Bearing network time: 2014-01-24

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The rolling sound is due to the rolling of the rolling element in the raceway when the NSK bearing rotates, and it announces a smooth and continuous noise; only when its sound pressure level or cavity is extremely large, it leads to everyone's attention. In fact, the rolling sound is aroused. The sound energy is limited; as in normal conditions; the quality of the 6203NSK bearing track sound is 25 ~ 27dB. This noise is the most typical single row deep groove ball NSK bearing that accepts radial load; it has the following characteristics:
a. Noise and oscillation are random,
b. The oscillation frequency is above 1 kHz.
c. No matter how the speed changes, the main frequency of the noise is almost constant and the sound pressure level is improved with the addition of the speed.
d. When the radial clearance increases; the sound pressure level is sharply added,
e. NSK bearing housing increases rigidity; the lower the total sound pressure level; even if the speed increases, its total sound pressure level is not added much.
f. The higher the viscosity of the smoothing agent; the lower the sound pressure level; but the smoothness of the grease; the viscosity and the shape of the soap fiber can affect the noise value.
The source of the raceway sound is caused by the natural oscillation of the ferrule after the load. Because the elastic touch of the ferrule and the tumbling body constitutes a nonlinear oscillating system. When the smoothness or the machining precision is not high, the elastic characteristic is aroused. Related natural oscillations; it becomes noise when transmitted to the air. It is well known; even if the NSK bearing parts are processed with the most brilliant production skills of the world; there will always be a few minor errors in the appearance of the work; Small movements between the rolling elements stimulate the natural oscillation of the oscillation system.
Although the raceway noise of NSK bearings is unavoidable, it can adopt high-precision machining parts and exteriors; correctly select NSK bearings and accurately use NSK bearings to reduce noise and vibration.

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