What is the raceway sound of timken bearings? It refers to a slippery and continuous sound produced by the rolling elements rolling on the raceway surface when the bearing is running. It is a unique basic sound that occurs in all cylindrical roller 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 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 timken bearings, that is, timken 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. 1. For the side clearance of cylindrical and elliptical bearing bushes, it can be adjusted by manual grinding and scraping or the method of repairing and scraping after adding padding and turning in the middle of the bearing. 2. For the top clearance of cylindrical and elliptical bearing bushes, it can be adjusted by manual grinding and scraping or by adding pads to the bearing middle face when the situation permits. 3. For the fixed bearing bush with multiple oil wedges, in principle, it is not allowed to repair and adjust the bearing bush clearance. If the clearance is not suitable, the new pad should be replaced. 4. For multi-oil wedge tiltable bearing pads, scraping pads are not allowed to be repaired, and the pads should be replaced when the clearance is not suitable. For tiles with adjustable thickness, the amount of tiles can be adjusted by adding a stainless steel pad under the adjustment block behind the tile, or by reducing the thickness of the adjustment block. Note that for multi-oil wedge tiltable bearing pads, the thickness error between the pads in the same group should be less than 0.01mm The impact sound of the rolling element and its control method When the larger type of ball bearing or cylindrical roller bearing is running at low speed under pure radial load , Because the centrifugal force of the rolling element is small, the rolling element in the non-load zone will impact the cage or the raceway and make noise. 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. The rolling sound of timken bearing and its control method is the harsh metal friction sound that may occur in cylindrical roller bearings in all occasions. It is more likely to occur in grease and hardly occurs in 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 timken bearing can be used, or the radial clearance of the bearing can be appropriately reduced, the grease with excellent performance is used, and the compatibility with the cylindrical roller bearing can be improved. The rigidity of the machine.
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