(1)   The bearing raceway sound and its control method

Raceway sound when the operation of the bearing, the rolling body raceway surface of the scroll and to issue a slippery continuous sound is all rolling bearings are unique basic sound. The general sound of the bearing raceway sound and other sounds.

The ball bearing raceway sound is irregular frequencies above 1000Hz, its main frequency does not vary with speed change, but its total sound pressure level increased with the accelerated speed.

Bearing raceway sound, the raceway sound of the sound pressure level is reduced with increasing viscosity; raceway sound small bearings, its sound pressure level increase in the viscosity to about 20mm2 / s or more, by reducing into some increase.

Bearing rigidity greater the total sound pressure level, the lower raceway sound. If the radial clearance is too small, the raceway sound pressure level and frequency sharply increased with the reduction of the radial clearance.

Control raceway sound: selection of low-noise bearing waviness small bearings, careful selection of the conditions of use. The raceways sound often affect the mechanical noise, reduce the the raceways sound can reduce the mechanical noise.

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

larger types of ball bearings or cylindrical roller bearings in the low-speed operation under pure radial load, due to the centrifugal force of the rolling element is smaller; in the non-load rolling element will be the impact of cage or raceway noise. But as the speed increases, the sound will disappear.

The rolling element of impact sound control methods are: appropriate to reduce the radial clearance, the use of reasonable structure, materials submissive cage bearing.