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Bella2021.01.28 15:44
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1. SKF bearing raceway sound and its control method

The raceway sound is 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 rolling bearings. The general SKF bearing sound is the raceway sound plus other sounds. The raceway sound of a ball bearing is irregular, the frequency is above 1000 Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the speed of the speed. The sound pressure level of the SKF bearing with loud raceway sound decreases with the increase of viscosity; while the sound pressure level of the SKF bearing with low raceway sound decreases when the viscosity increases to about 20mm2/s or more. And it has increased. The greater the rigidity of the bearing seat, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases. The methods to control the raceway sound are: select low-noise bearings, that is, SKF bearings with small waviness, and carefully choose the conditions of use. The noise of the raceway often affects the noise of the entire machine, reducing the noise of the raceway can reduce the noise of the entire machine.

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-loaded area will impact the cage or raceway and cause noise due to the small centrifugal force of the rolling elements. But as the speed increases, this sound will disappear. The methods for controlling the impact sound of rolling elements include: appropriately reducing the radial clearance and using SKF bearings with a reasonable structure and a flexible cage.

3. Rolling noise of SKF bearing and its control method

Rolling noise is the harsh metal friction noise that may occur in cylindrical roller bearings in all occasions. Most of them occur in larger grease-lubricated SKF bearings, and are more likely to occur in grease with degraded base oil performance. It almost never happens. In addition, it is more likely to happen in winter. When bearing pure radial load, it is easy to happen in occasions with large radial clearance, and depending on the size of the model, it is easy to happen in a specific speed range, and it will happen continuously. It will appear intermittently again. The outer ring raceway adopts a special processing method to prevent the occurrence of rolling noise. If necessary, this SKF bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the use of high-performance grease and the improvement of the matching parts of the bearing rigidity.
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