The preload method can effectively reduce the noise

Listen to the sound and judge the motor bearing problem. Raceway sound The raceway sound is caused by the rolling elements rolling in the raceway when the bearing rotates, and a kind of smooth and continuous noise is excited. The preload method can effectively reduce the noise and reduce the radial clearance of the bearing after installation.

For example, under normal conditions, the high-quality 6203 bearing raceway sound is 25 ~ 27dB. This forced vibration often excites the second-order and third-order bending natural vibrations of the outer ring, thereby emitting the noise. If the bearing has a certain radial clearance, the rolling elements in the non-load zone do not contact the inner raceway, but due to centrifugal force, it may contact the outside 

For this reason, at low speeds, when the centrifugal force is less than the weight of the rolling elements, the rolling elements will fall and collide with the inner raceway or the cage and stimulate the natural vibration and noise of the bearing, and have the following characteristics: This noise can be prevented by reducing the radial clearance of the bearing and adopting a shallow outer ring raceway structure. 

Although the temperature rise of SKF Bearing Suppliers the bearing at this time is not high, it has little effect on bearing life and grease life, and does not affect rotation, but the unpleasant sound is disturbing, especially Large-scale short cylindrical roller bearings that bear radial loads often have this noise. 

Screaming It is a very violent scream caused by sliding friction between metals. It is easier to produce when using inferior grease. Grease lubrication Easy to produce, not easy to produce when oil lubricated. Some foreign companies use light rolling elements, such as ceramic rollers or hollow rollers.. This kind of noise is most typical of single row deep groove ball bearings bearing radial load