1 raceways sound.
The raceways sound inspire a smooth and continuous noise, to draw attention only when its sound pressure level or tone greatly when the rolling element bearing swivel raceway rolling. In fact, the raceway sound inspired by the sound energy is limited, as in normal circumstances, the quality of the 6203 bearing raceway sound is 25 ~ 27dB. This noise to withstand the radial load single row deep groove ball bearings of the most typical, it has the following characteristics: (a) noise, vibration is random; (b) vibration frequency above 1kHz; regardless of how changes in speed, the noise frequency almost the same sound pressure level with the speed increased with the increase; (d) when the radial clearance increases, the sound pressure level of a sharp increase; (e) bearing rigidity increases, the lower the total sound pressure level, even if the speed increases also increases the total sound pressure level is not; (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 processing bearing parts, the work surface there will always be varying degrees of small geometric errors, so that tiny fluctuations in the raceway and the rolling body to stimulate the natural vibration of the vibration system. Although it is inevitable, however, can be taken to the surface of high-precision machining parts, the correct selection of bearings and precision bearings used so NVH.
Rolling sound of the falling body
The noise under normal circumstances, mostly at low speeds and withstand large radial load bearing. Bearings operating under radial load, the load area with non-load bearing areas, if the bearing has a certain radial clearance, non-load the rolling body and the inner raceway does not touch, but the effect of centrifugal force may be associated with the outer circle contact this end, at low speeds, when centrifugal force is less than when the weight of the rolling element rolling experience of falling and inner raceway or cage collision and stimulate the inherent vibration and noise of bearings, and has the following characteristics: (a) grease lubrication is easy to produce, easy to produce oil lubrication. Easier to generate when using poor quality grease. (b) often occurs in winter. (c) when only the radial load, radial clearance also easy to produce. (d) will produce a specific range of the speed range of different size bearings are also different. (e) may be continuous sound may be intermittent sound. (f) of the forced vibration is often to stimulate the outer ring of the second, third bending natural vibration and thus the issue of the noise. Through the use of pre-loading method can effectively reduce the noise, reduce the installed capacity of the bearing radial clearance in selection of a good lubricant also has improved, some foreign companies with a light rolling element such as a ceramic roller or hollow roller technical measures to prevent the generation of this noise.
(3) the tip of song
It is quite intense screams of sliding friction between the metal bearing temperature is not high, without much impact on bearing life and grease life, does not affect the rotation, but not sweet sound disturbing, especially large radial load short cylindrical roller bearings often this noise, which is characterized by: (a) bearing radial gap large, easy to produce. (b) usually appears in the grease lubrication, oil lubrication is more rare. (c) decreases with the increase of the bearing size, often with a certain speed range. (d) often occur in winter. (e) its appearance is irregular, and unpredictable, and fill in the amount of fat and performance, installation and operation conditions. This noise can be used to reduce the radial bearing clearance and shallow outer ring raceway structure to prevent.
Cage sound
Bearing swivel to keep the free vibration of the frame and hit it with the rolling element or ferrule will send out this noise. It may occur in various types of bearings, but its sound pressure level is not too high and low frequencies. Its characteristics are: (a) stamping to keep the frame and plastic cages can produce. (b) whether it is thin oil or grease lubrication will occur. (c) most likely to occur when the outer ring to withstand the bending moment. (d) prone to radial gap large.
Cage pocket hole clearance and the cage and ring gap inevitably exists in the bearings finished, the complete elimination of the cage sound very difficult, but by reducing assembly errors, preferably the gap and cage runout to improve the .
Another cage, special sound is noisy due to the cage and the other bearing parts to guide the friction between the surface caused by the self-excited vibration of the cage. Punching deep groove ball bearings to keep the frame thinner, low bending stiffness in the radial and axial plane, the overall stability of difference, will be bearing the high-speed rotation due to bending and self-excited vibration caused by the "beep" .
Bearing radial loads and poor performance of grease case, the initial operation will hear a "click, click, noise, which is mainly rolling body to leave the loading area, the rolling body suddenly accelerated and cage hit the noise, this crash is inevitable but with the running of the period of time will disappear.
Prevent cage noise measures are as follows:
(a) To make the cage revolution movement and stability, should be adopted in the ring guide and pay attention to be given sufficient lubrication of the guide surface, given to improvement of tapered roller bearings of high-speed conditions will be guided by the roller L-shaped to maintain aircraft change Z-ring wall to guide the cage.
(b) bearing high-speed rotation, pocket hole clearance bearing cage cage vibration amplitude is much larger than pocket hole gap small vibration amplitude, so the pocket hole gap value is particularly important.
c to pay attention to minimize the radial clearance.
(d) maximize to keep the price of manufacturing precision, and to improve the cage surface quality, and helps to reduce the rolling element and keep the frame collision or friction noise.
(e) active use of advanced cleaning technologies, effective and thorough cleaning product parts Hop set to improve the cleanliness of the bearing.
Scroll through the body by the vibration
Bearings operating under radial load, the internal number of rolling body load bearing contact with the flexibility of the ferrule constitute the "spring" bearing the rolling element in periodic vibration by radial load line, while the shaft center so the meeting under the vertical movement or to do the horizontal movement caused by noise at the same time. Such vibration is called the rolling body vibration, especially at low speed is more obvious.
Amplitude and bearing type, radial load, radial clearance and the rolling element related to the number. Usually the amplitude is smaller, if the amplitude is large when the formation of the hazards, this is often used to reduce the radial clearance or impose appropriate preload to reduce.



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