The noise of motor bearings has always been a problem that plagues many engineers. Since the noise of motor bearings cannot be described in words, it often brings trouble to motor technicians in judgment. By introducing the source of bearing noise, let us combine on-site practice, plus the mastery and analysis of motor bearing knowledge, we will get a lot of useful judgment criteria on site. For example, what kind of noise is the normal noise of the bearing.

Are there any bearings without "noise"?

People often ask how to eliminate bearing noise. The answer to this question is that it is impossible to completely eliminate it. Because of the operation of the bearing itself, there must be some "noise". Of course, this mainly refers to the state of the bearing during normal operation.

Normal bearing noise includes:

1. The collision between the rolling element and the raceway in the non-load zone

The rolling elements of the bearing run in the bearing raceway. When the rolling elements run in the non-load zone, they rolling elements collide with the raceway in the radial or axial direction. This is because the rolling element itself comes out of the load zone and has a certain linear velocity. At the same time, the rolling element has a certain centrifugal force. If it rotates around the axis, it will collide with the raceway, resulting in noise. Especially in the non-loaded area, when residual clearance exists, such collision noise is particularly noticeable.

2. Collision between rolling element and cage

The main function of the cage is to guide the running of the rolling elements. Collision of rolling elements and cages is also a source of the noise. Such collisions include circumferential, radial, and possibly axial. From the point of view of the motion state, including the collision when the rolling body is inside the load zone and the rolling body actively pushes the cage; the collision when the cage pushes the rolling body in the non-load zone. The rolling elements collide with the cage in the radial direction due to centrifugal force. Due to the disturbance, the collision between the rolling element and the cage when the rolling element moves axially.

3. Rolling body stirs grease

When the inside of the bearing is filled with grease, there is a stirring of the grease in the operation of the rolling elements. This agitation also makes a corresponding noise.

4. The sliding friction of the rolling elements in and out

There is certain sliding friction between the rolling elements and the raceway when they enter the load zone. A certain degree of sliding friction may also occur when leaving the load zone.

5. Movement inside other bearings

The friction of the bearing lips with seals can also cause noise.

To sum up, it is not difficult to find that these rolling bearings running under normal conditions inevitably produce bearing noise. So the answer to the opening question is: the normal noise inherent in rolling bearings cannot be eliminated.

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