Bearing raceway sound and its control method Raceway sound is when the imported bearings running, its rolling body rolling on the raceway surface and issued a kind of slippery continuous sound, is all rolling bearings will happen the unique basic sound. General bearing sound is the raceway sound plus other sound. Ball bearing raceway sound is irregular, frequency in 1000Hz above, its main frequency does not change with the speed, but its total sound pressure level with the speed of speed and increase. Raceway sound big bearing, its raceway sound sound pressure level with the viscosity increase and reduce; And raceway sound small bearing, its sound pressure level in the viscosity increase to about 20mm2/s above, from reduce and turn to increase. 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 of the raceway sound and the main frequency will be reduced with the radial clearance and a sharp increase. Methods to control the raceway sound are: selection of low-noise bearings, i.e., bearings with a small degree of corrugation, and prudent selection of the conditions of use. Raceway sound often affects the noise of the whole machinery, reduce the raceway sound can reduce the noise of the whole machinery.

Rolling body impact sound and its control method Larger models of ball bearings or cylindrical roller bearings in pure radial load at low speed operation, due to the rolling body of the centrifugal force is small, in the non-load area of the rolling body will impact the cage or raceway and issued noise. But with the increase of speed, this sound will disappear. Rolling body impact sound control methods are: appropriate reduction of radial clearance, the use of reasonable structure and material has a pliable cage bearings.

Imported bearings rolling sound and its control methods Rolling sound is cylindrical roller bearings in all occasions may occur in the harsh metal friction sound, mostly occur in the grease lubrication of the larger types of bearings, and in the base oil performance degradation of grease is more likely to occur in oil lubrication, almost does not occur. In addition, in the winter is more likely to occur, when bearing pure radial load, in the radial clearance of the occasion is easy to occur, and with the size of the model is different, in a particular speed range is easy to occur, both will be continuous and intermittent occurrence. Outer ring raceway to take special processing method can prevent the appearance of rolling sound, if necessary, can choose this kind of bearing, or reduce the radial clearance of the bearing, the use of good performance grease and improve the rigidity of the machine parts with the bearing.
1) standard (G) tolerance bearings;
2)Radial bearings bear only radial load thrust bearings bear only axial load;
3)=0.1C (C is the basic dynamic load rating of the bearing);
4)rigid bearing housing and shaft;

5) normal lubrication and cooling conditions.

When the imported bearings in 0.1C load conditions, due to the rolling body and raceway contact surface contact stress increases, resulting in bearing operating temperature increases, lubricant performance relative deterioration, therefore, the bearing limit speed will be reduced accordingly. For C / = 10 range, because the limit speed reduction is very small, so can not be considered, that is, according to f1 = 1 value. For bear the role of joint load centripetal bearings, because of the load bearing rolling body number increases, friction resistance increases, heat rise, lubrication and cooling conditions become worse, and act on the cage on the force also increases, therefore, according to the type of bearings and the size of the loading angle, the ultimate speed of the bearings will be adjusted by multiplying a reduction coefficient f2.

If the selected limit speed of imported bearings can not meet the use of speed requirements, can be used to improve certain technical measures to improve, in order to achieve more satisfactory requirements. Such as improving the bearing tolerance level; appropriate increase clearance; change to special materials and improve the structure of the cage; change the lubrication mode, such as the use of oil and gas, oil mist and jet lubrication; improve the cooling conditions and so on.