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Analysis of four reasons why the bearing does not run smoothly

Release Time : 2024/01/15 Read：

In the actual operation of the bearing, many factors can cause problems in the bearing and cause the machine to malfunction. This article lists the 4 most common causes. Let's take a look at which 4 are?

1. The bearing is overheated

Overheating is the biggest culprit of bearing failure, mainly because bearing heating is generally an alarm signal for abnormal machine operation. Failure to deal with it as soon as possible will cause chain reactions such as machine damage. Common causes of bearing heating are:
(1) Bearing accuracy is low, improper selection

Bearing accuracy is not up to standard or there is a difference in selection, because the machine cannot meet the best operating conditions, it will intuitively cause the bearing to heat up. Solution: Use bearings with accuracy grades specified by the official requirements.

(2) Large vibration

For example, the coupling alignment process difference does not meet the requirements, the rotor has dynamic and static imbalance, the foundation rigidity is poor, the foot is virtual, rotating stall and surge.

During the operation of some rotors, due to the corrosion of the medium or the abrasion of solid impurities, or the bending of the shaft, unbalanced centrifugal force will be generated, which will cause the bearing to heat and vibrate, and the raceway will be seriously worn until it is destroyed.

(3) Insufficient cooling


Insufficient cooling is usually manifested as: pipeline blockage, inappropriate choice of cooler, poor cooling effect, etc.
Scaling and clogging of the cooler of the lubrication pipeline will cause the cooling effect to deteriorate, especially in summer production.

The cooler has serious fouling and frequent alarms for excessively high bearing temperature are encountered in many production sites. A more effective solution is to pickling the cooler before the summer.

(4) Improper installation

Improper installation is another important reason for bearing heating. Because the bearing is installed correctly or not, it has a direct impact on its life and the accuracy of the host, so the center line of the shaft and the bearing hole must be coincident during installation.

If the bearing is installed incorrectly, the accuracy is low, and the bearing has deflection, torque will be generated during rotation, causing the bearing to heat or wear. In addition, the bearing will generate vibration, increase the noise, and increase the temperature rise.

2. Dust and pollution

In precision machinery, motors and other equipment with high environmental requirements, various types of suspended particles in the air will enter the bearing working environment and cause various hazards. Corrosive particles may wear components, and conductive particles may interfere with component currents. Once the particles accumulate and block the periphery of the bearing, overheating will be accelerated. Obviously, choosing the correct IP protection level can alleviate this problem to some extent.


In outdoor equipment or environments with general conditions, although the entire bearing system has corresponding protection, it should be protected as much as possible to avoid secondary damage from sand, gravel and dust. In addition, it is easy to get wet outdoors, and moisture can corrode bearing components. When the humidity and particulate pollutants in the air mix, it is fatal to the bearing and further shortens the life of the machine.

3. Power supply problem

Harmonic currents caused by high frequency switching and pulse width modulation can cause voltage and current distortion, overload and overheating. This shortens the life of machines and bearings and increases long-term equipment costs.

Damage is always caused by partial discharge. The oil film between the inner ring groove of the bearing and the steel ball acts as a dielectric (capacitor), which is charged by the bearing current.

Once the voltage is high enough, short-circuit discharge, this regular discharge will corrode the metal, and the speed of the rotor will accelerate the corrosion. Higher rotation produces a thicker oil film, and the higher the voltage, the greater the damage; at low speeds, the oil film "contacts" the area larger and the risk of damage is much lower. The higher the speed, the higher the rated power and the higher the DC voltage, the greater the risk of damage.

Once the damaged steel ball surface is corroded, it will cause permanent vibration of the inner and outer rings.

4. Improper lubrication

Lubrication is a necessary condition to ensure the normal operation of the bearing. Lubrication has an important influence on the fatigue life and friction, wear and vibration of rolling bearings. About 40% of bearing damages are related to poor lubrication. The purpose of bearing lubrication is to form an oil film between the rolling surfaces of the bearing to prevent direct contact between metal and metal.

The effects of lubrication on rolling bearings are as follows:

(1)Reduce friction and wear and extend the life of the bearing;

(2)Discharge the frictional heat to prevent excessive temperature rise of the bearing;

(3)Prevent the intrusion of foreign matter and play a sealing role;

(4)Prevent metal corrosion.