The raceway sound of the bearing and its control method The raceway sound is a slippery and continuous sound emitted by the rolling elements rolling on the raceway surface when the bearing is running. It is a 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 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.

Impact sound of rolling elements and its control method When larger type ball bearings or cylindrical roller bearings run at low speed under pure radial load, the rolling elements in the non-load zone will impact the cage due to the small centrifugal force of the rolling elements or 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.

Rolling sound of bearing and its control method Rolling sound 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 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. .

1) Standard (G) class tolerance bearings;

2) The radial bearing only bears radial load, and the thrust bearing only bears axial load;

3)=0.1C (C is the basic dynamic load rating of the bearing);

4) Rigid bearing seat and shaft;

5) The lubrication and cooling conditions are normal.

When the bearing operates under the load condition of 0.1C, due to the increase of the contact stress between the rolling elements and the contact surface of the raceway, the working temperature of the bearing increases, and the performance of the lubricant is relatively deteriorated. Therefore, the limit speed of the bearing will be corresponding. reduce. For the range of C/=10, since the limit speed is reduced very little, it can be ignored, that is, the value is taken as f1=1. For radial bearings under combined load, due to the increase in the number of rolling elements under load, the frictional resistance increases, the heat generation increases, the lubrication and cooling conditions become worse, and the force acting on the cage also increases. Therefore, it must be According to the bearing type and the size of the load angle, the limit speed of the bearing is multiplied by a reduction factor f2 to adjust.

If the limit speed and rotation speed of the selected bearing cannot meet the requirements of use, some improved technical measures can be used to improve it to achieve more satisfactory requirements. Such as increasing the bearing tolerance level; appropriately increasing the clearance; changing to special materials and improving the structure of the cage; changing the lubrication method, such as using oil and gas, oil mist and jet lubrication; improving cooling conditions, etc.