1. The sound of raceway
Race is due to the rolling element bearing rotates in raceway rolling and inspire a smooth and continuous noise, only when the sound pressure level or tone great concern. Actually raceway sparked by the sound of sound energy is limited, such as in normal circumstances, quality of 6203 bearing raceway is 25 ~ 27 db. This noise to bear radial load of single row deep groove ball bearing is the most typical, it has the following features: a. the randomness of noise and vibration; B. vibration frequency above 1 KHZ; C. no matter how change speed, the main frequency noise almost unchanged while the sound pressure level increase with the increase of rotational speed; D. when the radial clearance increases, the sound pressure level increased dramatically; E. bearing stiffness increases, the lower the total sound pressure level, even if the speed increases, the total sound pressure level increases; F. lubricant viscosity is higher, the lower the sound pressure level, but for grease lubrication, the viscosity, the shape of soap fiber size can influence the noise value.
Raceway acoustic source lies in the inherent vibration caused by ring after exposure to the load. Because of the ring and rolling body elastic contact nonlinear vibration system. When lubrication or the machining accuracy is not high will stimulate the related to the elastic characteristics of natural vibration and passed to the was noise in the air. As is known to all, even if is to use the contemporary most advanced manufacturing technology and processing the bearing parts, there will always be the working surface of varying degrees of tiny geometric error,FAG 6205 Bearing http://www.bearing-us.com/FAG-6205-Deep-Groove-Ball-Bearing-15910.html thus make the raceway and rolling body produces slight fluctuations inherent vibration excitation vibration system. Although it is inevitable, but can take work surface precision machining parts, choose correct bearing and precise use bearing noise vibration reduction.
2. Fall rolling noise
The noise usually, mostly appear in low speed and large bearing to bear radial load. When under radial load bearing, bearing the load and the load area, if the bearing has a certain radial clearance, the load of roller and inner raceway is not contact, but because of the action of centrifugal force may be in contact with the outer ring, therefore, under the low speed, when the centrifugal force is less than the rolling body weight, scrolling experience fall with inner raceway or bearing cage collision and to stimulate the natural vibration and noise, and has the following features: a. grease lubrication easy generation, oil lubrication is not easy to produce. When using inferior grease is easier to produce. B. often occur in winter. C. for only radial load and also easy to produce radial clearance is bigger. D. also can produce in a certain range and the different size of bearing its speed range is also different. E. may be continuous sound may be interrupted. F. the forced vibration often stimulate the outer ring of the second order and third order bending vibration mode, which produces the noise. By using the load method can effectively reduce the noise, reduce work bearing radial clearance after installed, choose good lubricant can improved, some foreign enterprises to adopt light rolling body, such as ceramic roller or hollow roller and other technical measures to prevent the generation of this kind of noise.
3. Sharp whine
It is sliding friction between metal produce fairly sharp scream, though bearing temperature rise is not high, at this time is little effect on bearing life and grease life, also does not affect the rotation, but not sweet sound disturbing, especially bear radial load large short cylindrical roller bearing is the noise, its characteristic is: a. bearing radial clearance when easy to produce. B. usually appear in grease lubrication and oil lubrication are relatively rare. C. and decreases as the size of bearing, and often appears in a certain speed range. D. often appear in winter. E. it is without rules, and unpredictable, and fill in the amount of fat and related performance, installation and operation conditions. This can be used to reduce noise bearing radial clearance and shallow outer ring raceway structure is used to prevent.