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When the import operation of the bearing under a radial load, its internal only a plurality of rolling load, due to the ferrule elastic contact constitute the "spring" supporting the rolling body in the radial load line generates periodic oscillation, and the shaft center will therefore moving vertically or horizontally moving, at the same time triggered noise. This kind of vibration is called rolling through the vibration, especially in low speed when the more obvious.
The amplitude type, and imported bearing radial load, radial clearance and ball number of. Usually the smaller amplitude, if the amplitude is large when the harm, this is often the minish preload appropriate axial clearance or to reduce.

The 1 raceway acoustic
Raceway is due to imports of 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 increases sharply; e. import bearing rigidity 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 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 noise reduction in import EDA Bearing and precision use imported EDA Bearing to vibration.
2 fall rolling sound
The noise in general, mostly large EDA Bearing at low speeds and bear radial load. When the import operation of the bearing in the radial load, load and non load bearing, if the bearing has a radial clearance, the non load area of the rolling body and the inner raceway no contact, but because of the action of centrifugal force may be associated with the outer ring contact, therefore, at low speeds, the centrifugal force is less than the rolling body weight, natural vibration and noise of rolling down and inner raceway or cage collision and motivate the imported bearing, and has the following characteristics: easy to produce A. grease lubrication, oil lubrication is not easy to produce. When use inferior lubricating grease are more susceptible to. 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. Through the use of pre load equation method can effectively reduce the noise, reduce the installed after the inlet radial bearing 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 EDA Bearing often have this noise, the features: A. bearing radial clearance large easy to produce. B. usually occurs in grease lubrication, oil lubrication is rare. C. decreases with the increase in the size of imported EDA Bearing, 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.
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 process of rotation, import EDA Bearing. It may appear in various types of imported EDA 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 import EDA Bearing in finished products to exist, thus completely eliminate cage sound is very difficult, but can reduce the assembly error, gap optimum and cage movement to improve.
Another cage special sound is due to the holder and other imported bearing parts leading between the rubbing surfaces caused maintain self-excited vibration and noise frame. Stamping of deep groove ball bearing retainer is thin, curved in the radial and axial in-plane stiffness is low, the overall poor stability, import EDA Bearing rotate at high speed will be due to bending deformation caused by self-excited vibration, "beep".
When the import EDA Bearing under radial load and oil poor performance situation, at the beginning of operation "Kacha, Kacha hear noise", which is mainly due to the rolling body left in the load zone, noise suddenly accelerated and cage collision by rolling, the crash is inevitable but with running for a period of time will disappear.
To prevent the holder noise measures are as follows:
A. cage revolution motion stability, should as far as possible by the ring guide way and pay attention to guide the full lubrication, give the improvement of the tapered roller bearing structure of high speed conditions, the L type roller guide holder is changed to Z type ring rib guide holder.
B. EDA Bearing rotate at high speed, import EDA Bearing pocket clearance of the cage vibration amplitude is much larger than the pocket hole cage vibration amplitude gap is small, so the pocket clearance value is very important.
C. should pay attention to reduce the radial clearance.
D. try to improve retention value manufacturing accuracy, improve the surface quality of the holder, helps to reduce body roll and keep the noise frame collision or friction.
E. actively adopt advanced cleaning technology, cleaning effective parts and the set of products, improving the cleanliness of bearing.
5 by rolling vibration