How to deal with excessive bearing temperature

·The bearing temperature is too high, similar to an abnormal situation of "fever". It is a common and harmful malfunction of rotating equipment. If the cause is unknown and handled improperly, it often results in twice the effort, reducing the service life of bearings, increasing maintenance costs, and even causing bearing burnout.

·Therefore, quickly determining the cause of the malfunction and taking appropriate measures to solve it is the guarantee for the continuous and safe operation of the equipment.

·The bearing temperature is too high - the culprit is here

·There are many reasons for high bearing temperature, and we have compiled several common problems for everyone.




-Poor lubrication

·Lubrication has a significant impact on the service life, friction, wear, vibration, etc. of bearings, and good lubrication is a necessary condition to ensure the normal operation of bearings. According to statistics, about 40% of bearing damage is related to poor lubrication.

·The main effects of lubrication on bearings include:



-1) Prevent metal corrosion -2) Prevent foreign objects from invading, providing a sealing effect. 3) Remove frictional heat to prevent excessive bearing temperature rise. 4) Reduce friction and wear, and extend bearing life




·The longer the rotation time, the better the quality? Facts have proven to be related to lubricating oil

·The factors that usually cause poor lubrication of bearings include:

·1) Insufficient lubricating oil (grease)

·2) The lubricating oil pipe is blocked by foreign objects, etc

·3) There is a quality issue with the lubricating oil (grease) -4) The lubricating oil (grease) was not added on time -5) The lubricating oil (grease) contains impurities

Bearing wear

·As an important component, bearings are used in various sizes of machinery, and some machinery (such as crushers) have a high level of dust in their working environment. When some fine dust enters the high-speed running bearing seat, it causes the lubricating oil or grease inside the bearing seat to deteriorate, resulting in poor lubrication and subsequent wear of the bearing. The bearing continues to operate in a worn state, but due to increased friction and heat, the temperature of the bearing increases.



·Improper installation

·Improper installation is another important cause of bearing heating. Because the correct installation of bearings has a direct impact on their lifespan and host accuracy, it is required that the centerline of the shaft and bearing hole must coincide during installation

·If the bearing is not installed correctly, has low accuracy, and has deflection, torque will be generated during rotation, causing the bearing to heat or wear. In addition, bearings will also generate vibration and increase noise, which will also increase the temperature rise

-Insufficient cooling

·Insufficient cooling is usually manifested as blocked pipelines, improper selection of coolers, and poor cooling effectiveness.



-▲ Cooler

·The cooler of the lubrication pipeline is clogged with scale, which can lead to poor cooling effect, especially during summer production. This problem is particularly common (public account: pump manager). Some manufacturers are willing to increase or parallel connect coolers to enhance the cooling effect.

·Severe scaling of the cooler and frequent alarms due to high bearing temperature are common in many production sites. A more effective solution is to acid wash and descale the cooler before summer each year.

·High vibration

·For example, the poor alignment process of the coupling does not meet the requirements, there is dynamic and static imbalance in the rotor, poor foundation rigidity, weak foundation, rotational stall and surge.

·▲ Coupling

·Some rotors may experience corrosion from the medium, wear from solid impurities, or bending of the shaft during operation,