Types and control methods of high temperature bearing noise Situation 1: Raceway sound of high temperature bearing and its control method , is the unique basic sound that occurs in all rolling bearings. The general bearing sound is the raceway sound plus other sounds. The raceway sound of the ball bearing is irregular, the frequency is above 1000Hz, its main frequency does not change with the rotation speed, but its total sound pressure level increases with the acceleration of the rotation speed. For a bearing with loud raceway sound, the sound pressure level of its raceway sound decreases with the increase of viscosity; while for a bearing with a small raceway sound, its sound pressure level changes from decreasing to about 20mm2/s when the viscosity increases. to increase. The more rigid the housing, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of the raceway sound will increase sharply with the reduction of the radial clearance. The methods of controlling the sound of the raceway are as follows: choose low-noise bearings, that is, bearings with small waviness, and carefully select the conditions of use. The sound of the raceway often affects the noise of the entire machine, and reducing the sound of the raceway can reduce the noise of the entire machine. Case 2: Impact sound of rolling elements and its control method When larger ball bearings or cylindrical roller bearings run at low speed under pure radial load, the rolling elements in the non-load zone will be affected due to the small centrifugal force of the rolling elements. Noise is generated by impacting the cage or raceway. But as the revs increase, the noise disappears. The control methods for the impact sound of rolling elements are: reduce the radial clearance appropriately, and use a bearing with a cage with a reasonable structure and a flexible material. Situation 3: The rolling sound of high temperature bearing and its control method The rolling sound is the harsh metal friction sound that may occur in all occasions for cylindrical roller bearings. It is more likely to occur in greases with degraded oil properties, and hardly occurs during oil lubrication. In addition, it is more likely to occur in winter. When subjected to pure radial load, it is prone to occur in occasions with large radial clearance, and it is prone to occur within a specific speed range depending on the size of the model, and it will occur continuously. Reappears intermittently. Adopting a special processing method for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, this kind of bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the grease with excellent performance is used, and the rigidity of the matching parts of the bearing can be improved. .
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