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The effect of grease filling on bearing temperature is complex and multifaceted, involving not only the amount of grease but also factors such as the type of grease, its distribution, and the operating environment. Proper lubrication can effectively reduce friction and wear during bearing operation, thereby maintaining a reasonable temperature level. However, incorrect application methods or amounts of lubricant may lead to a rise in temperature, which not only affects the bearing’s performance but may also shorten its service life. The following will provide a detailed analysis of the impact of grease filling on the increase in bearing temperature: 1. Excessive amount of grease leads to an increase in temperature (1) Increased rotational resistance: When too much grease is used, it moves vigorously inside the bearing, increasing rotational resistance and thus raising the temperature. (2) Accelerates grease deterioration: An increase in temperature speeds up the oxidation of grease, causing it to deteriorate prematurely and shortening its service life. The precipitation of the base oil accelerates, causing the grease to dry out and harden, which further deteriorates the lubrication conditions, creating a vicious cycle. 2. Improper filling amount affects bearing performance (1) Increased friction torque: When the amount of grease filled increases, the friction torque rises, leading to an increase in bearing temperature. (2) Sealing issues: Overapplication of grease also increases the pressure on seals, which may lead to seal rupture or failure. This allows contaminants or moisture to enter, thereby damaging the bearings. 3. Uneven distribution of grease leads to localized overheating (1) Issue with new grease integration: The newly added grease fails to melt and distribute evenly, resulting in excessive local friction and thus an increase in temperature. (2) Running-in period: After new lubricant is added, a running-in period is required, with the speed reduced to 30–60% of the standard operating speed, in order to avoid overheating caused by uneven distribution. 4. An inappropriate type of grease affects the lubrication effect. (1) Incorrect grade selection: Using a grease grade that does not meet the requirements of the bearing can result in poor lubrication and increased temperatures. (2) Degradation or contamination of lubricants: If lubricants are contaminated or degraded, they lose their normal lubricating function, increasing the frictional resistance during bearing operation and thus leading to an increase in temperature. 5. Assembly quality and environmental issues (1) Improper assembly: Incorrect assembly of bearings, such as too loose or too tight a fit with the end caps, can also lead to abnormally high temperatures. (2) Environmental impact: Insufficient cleanliness of the bearings and their surrounding environment can also have an adverse effect on them, including an increase in temperature. 6. Improper operation and maintenance (1) Incorrect greasing technique: Improper handling during the application of lubricant, such as inadequate control of the pressure from the grease gun, can also lead to excessive or uneven application of the lubricant, thereby causing an increase in temperature. (2) Insufficient maintenance monitoring: The lack of appropriate monitoring and maintenance of the bearing’s operating condition may result in problems that cause temperature increases not being detected and addressed in a timely manner. In addition to the above, the following aspects also need attention: (1) Determine the appropriate amount of grease to be filled, avoiding either too much or too little. (2) Select the appropriate type of grease to ensure it meets the requirements of the bearing. (3) When filling in lubricant, pay attention to the proper method of operation to avoid problems caused by improper technical handling. (4) Regularly inspect and maintain the bearings to ensure that the bearings and their surrounding area remain clean. Summary: Factors such as the amount of grease added, its type, distribution, and the operating environment all have a significant impact on the temperature of bearings. The proper method of greasing and maintenance can effectively control the temperature of bearings, ensuring their normal operation and long-term durability.