Why does the bearing temperature rise after grease filling?
Greases play a vital role in bearings, the main purpose of which is to reduce friction and wear and protect bearings from damage. However, when the grease is not filled properly, the bearing temperature may increase abnormally, which has a negative impact on the performance and life of the bearing.
First of all, excessive grease injection is one of the main reasons for the rise in bearing temperature. Too much grease turns violently inside the bearing, forming additional resistance, which increases the rotating load of the bearing, which in turn causes the temperature to rise. In addition, too high temperature will accelerate the oxidation rate of grease, make it deteriorate in advance, accelerate the precipitation of Base Oil, dry hardening of grease, and further deteriorate the lubrication conditions, forming a vicious cycle.
Secondly, the improper filling of grease will also affect the performance of the bearing. Too much filling will increase the friction torque and increase the bearing temperature. At the same time, too much grease may also increase the pressure of the seal, leading to seal rupture or failure, and then introduce impurities or water vapor, causing damage to the bearing.
Uneven distribution of grease is also an important reason for local overheating of bearings. If the newly added grease is not quickly melted and evenly distributed, it will lead to excessive local friction and cause the temperature to rise. In addition, after the new grease is added, there should be an appropriate running cycle, and the speed is reduced to 30 to 60% of the standard operation to ensure the uniform distribution of the grease and avoid overheating problems.
The choice of grease type is also crucial to the lubrication effect. The use of grease grades that do not match the bearing requirements may lead to poor lubrication and higher temperatures. At the same time, if the grease is contaminated or deteriorated, it will lose its normal lubrication function, increase the friction resistance of the bearing operation, and then lead to a rise in temperature.
In addition to the factors of the grease itself, the assembly quality and the environment will also have an impact on the bearing temperature. Improper bearing assembly, such as too loose or too tight with the end cap, will cause abnormal temperature rise. In addition, the insufficient cleanliness of the bearing and its surrounding environment will also cause adverse effects on the bearing, including temperature increase.
In terms of operation and maintenance, improper refueling technology and insufficient maintenance monitoring are also causes of rising bearing temperatures. If the pressure of the grease gun is not properly controlled during refueling, excessive or uneven grease may be added, causing the temperature to rise. The lack of proper monitoring and maintenance of the operating state of the bearing may lead to the failure to timely detect and deal with problems that lead to temperature increases.
Therefore, in order to ensure the normal operation and long-term durability of the bearing, we need to pay attention to the following aspects: determine the appropriate grease filling amount to avoid too much or too little; Select the appropriate grease type to ensure that it matches the requirements of the bearing; When adding grease, pay attention to the operation method to avoid the introduction of problems due to improper technical operation; Check and maintain bearings regularly to ensure that bearings and their surrounding environment are clean. Through these measures, we can effectively control the temperature of the bearing to ensure its normal operation and long-term durability.
