The nature of bearing noise

Noise is very common for bearings to be used. Even low noise bearings in bearings have the same situation. So why is it noisy?

(1) The rolling sound of bearing and its control method

The rolling track sound is a kind of continuous sound of sliding when the rolling body rolls on the raceway surface when the shaft is transported and turned. It is the unique basic sound that all rolling bearings will produce. The general bearing sound is the rolling track sound plus other sound. The rolling track sound of ball bearing is irregular, and the frequency is above 1000Hz, and its main frequency rate does not change with the speed, but its total sound pressure level increases with the speed of speed. The sound pressure level of the bearing with high noise decreases with the increase of viscosity; The sound pressure level of the bearing with low noise increases from decreasing to increasing when the viscosity increases to about 20mm2 / s. The higher the rigidity of the bearing pedestal, the lower the total sound pressure level of the rolling track sound. If the radial clearance is too small, the total sound pressure level and the main frequency rate of the rolling track sound will increase sharply with the decrease of the radial clearance. The methods to control the noise of raceway are: low noise bearing is selected, which is bearing with small ripple, and carefully selects the use conditions. The noise of rolling track often affects the noise of the whole machine, and the noise of the whole machine can be reduced by reducing the noise of the rolling track.

(2) The impact sound of rolling body and its control method

When the larger ball bearings or cylindrical roller bearings operate at low speed under pure radial load, the rolling body in the non load area will impact the cage or raceway and make noise because of the small centrifugal force of the rolling body. But as the speed increases, the sound disappears. The control method of rolling body impact sound includes: reducing radial clearance properly, using bearings with reasonable structure and flexible materials.

(3) Rolling sound of bearings and its control method

Rolling sound is the harsh metal friction sound that can occur in all occasions of cylindrical roller bearings. Most of them occur in larger bearing with grease lubrication, but it is more likely to occur in grease with poor performance of base oil, and rarely occurs when lubricating oil. In addition, it is easy to occur in winter. When it is under pure radial load, it is easy to happen in the case of large radial clearance. With the different model size, it is easy to occur in a certain range of speed, which will occur continuously and intermittently. Special processing method can prevent the appearance of rolling sound for outer ring raceway. If necessary, it can be selected, or the radial clearance of bearing can be reduced appropriately, and the grease with excellent performance and rigidity of matching parts with bearing can be improved.