For the use of bearings, it is very common to generate noise. Even the low-noise bearings in NSK bearings have the same situation. So why is there noise? Today I will introduce the essence to you.
(1) Bearing track sound and its control method Rolling sound is a kind of slippery continuous sound that the rolling element rolls on the raceway surface when the bearing is running. It is the unique basic sound that all rolling bearings will produce. . The general bearing sound is the rolling sound plus other sounds. The ball bearing's raceway sound is irregular, the frequency is above 1000Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the increase of the speed. For bearings with large rolling sounds, the sound pressure level of the raceway sound decreases with the increase of viscosity; while for bearings with small raceway sound, the sound pressure level decreases when the viscosity increases to about 20 mm2/s or more. For the increase. The greater the rigidity of the bearing 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 main frequency of the raceway sound will increase sharply as the radial clearance decreases. The method of controlling the rolling sound is to select a low-noise bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.
(2) Impact sound of rolling element and its control method When the larger type of ball bearing or cylindrical roller bearing runs at low speed under pure radial load, the rolling element in the non-load area will be small due to the small centrifugal force of the rolling element. Noise is generated by impacting the cage or raceway. But as the speed increases, the sound will disappear. The control methods for the impact sound of the rolling element are: appropriately reducing the radial clearance, and using a bearing having a reasonable structure and a flexible material.
(3) Bearing rolling sound and its control method Rolling sound is a harsh metal friction sound that can occur in cylindrical roller bearings in all occasions, most of which occur in grease-lubricated larger type bearings, and in base oil performance Deteriorated grease is more likely to occur and hardly occurs when oil is lubricated. In addition, it is more likely to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the model, and it will occur continuously. It will appear intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, the bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, and the grease with excellent performance and the rigidity of the bearing device can be improved.
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