Reasons for and Solutions to Bearing Overheating

Bearings and similar components are prone to wear or overheating over time, and this is quite normal. The likelihood of such occurrences is higher during summer, when it's advisable to let them rest and shut down. However, if the bearings are overheating, that's a problem. Next, we aim to discuss two aspects: the causes of bearing overheating and the methods to address them.

Possible reasons for bearings operating at temperatures above normal may include: 1. Uneven fitting or insufficient contact area between the bearing and shaft neck (tight fit), resulting in excessive pressure per unit area, which commonly occurs during initial operation of new machinery or after replacing new bearing shells; 2. Misalignment of the bearing or bending and twisting of the crankshaft; 3. Poor quality of the bearing shell, lubricant not meeting specifications (low viscosity), or blocked oil passages; 4. Contamination in the bearing or excessive and dirty lubricant; 5. Uneven excessive wear on the bearing shell; 6. Misalignment during compressor installation of the main shaft with the motor (or diesel engine) shaft coupling, resulting in significant error and misalignment of the two shafts.

Exclusion Methods: 1. Scrape and grind the bearing shell with coloring method to ensure the contact surface meets requirements and improve the specific pressure per unit area; 2. Adjust the clearance appropriately, inspect for crankshaft bending and twisting, and replace or repair the crankshaft as needed; 3. Use high-quality bearing shells, check the oil supply line and gear oil pump, and use lubricating oil that meets quality standards, adjusting the oil pump to reach the required pressure; 4. Clean and replace new engine oil, adjusting the oil pressure; 5. Replace new bearing shells; 6. Ensure the concentricity of the two machines is correct, and the flatness tolerance values should comply with the specifications in the machine manual. Pay special attention to aligning when using a rigid connection between the compressor and the electric motor.

The article addresses the causes and solutions for bearing overheating, which should be clear to everyone after reading. The content we introduce in practical operations is quite common, but because it's often overlooked, people are often at a loss for how to resolve issues when they arise. Additionally, another reason is that there is a lack of knowledge about these aspects, which leaves individuals without methods to address problems.