If the bearing is in a good state of continuous rotation, it will emit a low whining or humming sound. If the sharp hiss, squeak and other irregular sounds are emitted, it often means that the bearing is in poor continuous rotation. The sharp squeaking noise may be caused by improper lubrication. Improper bearing clearance can also cause metallic sound.

Dents in the track of the outer ring of the bearing can cause vibrations and create a smooth, clear sound.

If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is rolled, if there are pollutants in the bearing often cause the hiss sound. Serious bearing damage will produce irregular and loud noise.

If the percussion scar caused by installation will also produce noise, the noise will be different with the height of the bearing speed.

► Loud metal noise

Cause 1: abnormal load, countermeasures: correct fit, study bearing clearance, adjust and load, correct the position of the shell shoulder.

Cause 2: poor installation, countermeasures: shaft, shell processing accuracy, improve installation accuracy, installation method.

Cause 3: Insufficient or unsuitable lubricant. Countermeasures: supplement lubricant and choose appropriate lubricant.

Cause 4: Rotating parts are in contact. Countermeasure: Modify the contact part of the curved path seal.

► Regular noise

Cause 1: The rolling surface is indentation, rust or scar caused by foreign bodies. Countermeasures: replace the bearing, clean the relevant parts, improve the sealing device, and use clean lubricant.

Cause 2: (after steel carburizing) surface deformation, countermeasures: replace the bearing, pay attention to its use.

Cause 3: Raceway surface stripping, countermeasures: replacement of bearings.

► Irregular noise

Cause 1: Clearance is too large, countermeasures: study fit and bearing clearance, modify the pre-load.

Cause 2: foreign body invasion, countermeasures: study to replace the bearing, clean the relevant parts, improve the sealing device, use clean lubricant.

Cause 3: spherical damage, peeling, countermeasures: replacement of bearings.

e-mail：bearing6@hyzcgroup.com