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The 1 raceway acoustic
Rolling road sound is due to NSK bearing rotates roller rolling in the rolling way to stimulate a smooth and continuous noise, only when the sound pressure level or tone greatly when attention. In fact, the rolling sound excited acoustic energy is limited, such as in the normal condition, high quality bearing raceway acoustic ranged from 25 to 27dB. Single row deep groove ball bearing this noise to bear radial load as the most typical, it has the following characteristics: A. noise, vibration is random vibration frequencies above 1kHz; B.; C. regardless of how to change speed, noise frequency and sound pressure level is almost the same with the speed increasing; D. when the radial clearance increases, pressure level increased dramatically; rigid E. bearing increases, the lower the total sound pressure level, even if the speed increased, the overall sound pressure level also increased slightly; F. lubricant viscosity is high, the sound pressure level is low, but for grease lubrication, the shape and size of the viscosity, the soap fiber can affect the value of the noise.
Rolling road sound source is the inherent vibration caused by load ring after. Due to the elastic contact rings and rolling elements of nonlinear vibration system. When the lubrication or machining precision is not high it will inspire the vibration associated with the elastic characteristics, transfer into the air into a noise. As everyone knows, even using the modern technology of manufacturing the highest machining NSK bearing parts, its work surface there are tiny geometric error is not a degree, so that the raceway and rolling body produce tiny wave excitation vibration vibration system. Although it is inevitable, however, can adopt high precision machining parts work surface, the correct selection of denoising bearing and precise use of the bearing so that the damping.
2 fall rolling sound
B. often occurred in winter. C. for only the radial load and the radial clearance is large but also easy to produce. D. also can be in a certain range and different size bearing its speed range are also different. E. may be a continuous sound may be intermittent sound. F. the forced vibration often excited outer two order, three order bending vibration, thus make the noise. F. the forced vibration often excited outer two order, three order bending vibration, thus make the noise. Through the use of pre load equation method can effectively reduce the noise, reduce the installed bearing radial clearance, choose good lubricants can also improve, some foreign enterprises adopt light rolling body, such as ceramic roller or hollow roller and other technical measures to prevent the occurrence of such noise. The 3 tip. It is a metal sliding friction produced quite sharp scream, though bearing temperature rise is not high, it will not have much impact on the service life of the bearing and grease life, does not affect the rotation, but not melodious sound disturbing, especially bear radial load of large cylindrical roller bearings often have this noise, the features: A. bearing radial clearance large easy to produce.
B. usually occurs in grease lubrication, oil lubrication is rare.
B. usually occurs in grease lubrication, oil lubrication is rare. C. decreases with the bearing size increases, and often appears in a certain speed range. D. winter often. E. its appearance is irregular, and unpredictable, and associated with the installation of operating conditions and performance, filling grease amount. This noise can be used to reduce the bearing radial clearance and the shallow outer ring raceway structure to prevent. This noise can be used to reduce the bearing radial clearance and the shallow outer ring raceway structure to prevent.
The 4 holder of sound
Keep the free vibration of frame and the rolling body or ring phase impact will send this noise in the bearings rotate process. It may appear in all kinds of bearing, but its sound pressure level is not too high and the low frequency. Its characteristics are: A. stamping cage and plastic holder can be generated. B. either oil or grease will appear. C. when the outer ring bearing the bending moment is most likely to occur. D. radial clearance large easily.

Because the cage pocket clearance and the holder and the ring gap is inevitable in bearing product to exist, thus completely eliminate cage sound is very difficult, but can reduce the assembly error, gap optimum and cage movement to improve.
Use hearing to identify irregular running is a very common method. For example: with the electronic stethoscope to certain a part of abnormal noise often is a method used by the operator.
Imported bearings is good running condition will issue a muffled whining sound. If a sharp hissing sound, squeaky voice and other irregular sound, often said bearings is bad running status.
A sharp creak noise may be due to inadequate lubrication caused. NSK bearing clearance can also cause inappropriate metallic sound. A concave rail bearing outer ring orbit will cause vibration, resulting in smooth crisp sound. If due to the installation of the percussion scars will produce noise, this noise will be with the bearing speed vary.
If intermittent noise, said rolling element may be damaged. This sound is when the damage occurred in the surface is rolled out, NSK bearing if contaminants often causes hissing sound. With the serious damage will produce irregular and loud noise.