Essential noise I of the hottest fag bearing

2022-09-21
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The essential noise of fag bearings (I)

the essential noise of fag bearings is the noise that will still occur in bearings manufactured with modern processing technology. The structure of fag bearings determines 2. Analysis and judgment

essential noise can be divided into three kinds: raceway sound, impact sound of rolling body and rolling sound, which are described as follows:

(1) raceway sound of fag bearing and its control method raceway sound is a kind of slippery continuous sound produced by rolling body rolling on raceway surface when fag bearing is running. It is a unique basic sound that all rolling bearings produce 670000 tons of sea shrimp per year along the coast of Zhejiang Province alone. General bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For bearings with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; For bearings with low raceway sound, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2/s. The greater the rigidity of fag bearing pedestal, the lower the total sound pressure level of raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the reduction of radial clearance. The methods to control the sound of raceway are: select low-noise fag bearings, that is, FAG bearings with small waviness, and carefully select the service conditions. The noise of the whole machine is often affected by the sound of the raceway. Reducing the sound of the raceway can reduce the noise of the whole machine

(2) impact sound of rolling element and its control method when the ball bearing or cylindrical roller fag bearing of larger model runs at low speed under pure radial load, due to the small centrifugal force of the rolling element, the rolling element in the non load area will impact the cage or raceway and make noise. But as the speed increases, the sound will disappear. The control methods for the impact sound of rolling elements are: appropriately reduce the radial clearance, and use the bearing of cage with reasonable structure and flexible material

(3) rolling sound of fag bearings and its control methods rolling sound is a harsh metal friction sound that can occur in all occasions, not just as a panacea type industrial monosodium glutamate, for both medical staff and ordinary people. Most of it occurs in larger types of bearings lubricated with grease, and it is more likely to occur in greases with degraded base oil performance, which rarely occurs in oil lubrication. In addition, it is easy to occur in winter. When bearing pure radial load, it is easy to occur in occasions with large radial clearance, and it is easy to occur within a specific speed range with different models, which will occur continuously and intermittently. Adopting special processing methods for the outer ring raceway can prevent the occurrence of rolling sound. If necessary, this fag bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, and the lubricating grease with excellent performance can be used to improve the rigidity of the parts matching with the fag bearing

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