First of all, we must first understand the cause of bearing heating.
The reasons why the bearing exceeds the normal temperature during operation may be:
1. The joint between the bearing and the journal is uneven or the contact surface is too small (the fit gap is too small), and the specific pressure per unit area is too large. Most of this happens after the trial operation of the new machine or the replacement of the bearing bush;
2. The bearing is deflected or the crankshaft is bent or twisted;
3. The quality of the bearing bush is not good, the quality of the lubricating oil is inconsistent (low viscosity), or the oil circuit is blocked. The oil supply pressure of the gear oil pump is too low, and the oil supply is interrupted, resulting in lack of oil in the bearing bush, resulting in dry friction;
4. The bearing has sundries or too much lubricating oil, too dirty;
5. The bearing bush has uneven excessive wear;
6. When the compressor is installed, the shaft coupling between the main shaft and the motor (or diesel engine) is not aligned, and the error is too large, causing the two shafts to tilt.
After understanding the cause of bearing heating, we can prescribe the right medicine.
Method of exclusion:
1. Use the coloring method to scrape and grind the bearing bush to make the contact surface meet the requirements and improve the specific pressure per unit area;
2. Properly adjust its matching clearance, check the bending and twisting of the crankshaft, and replace the crankshaft with a new one or repair it according to the situation;
3. Use bearing bushes that meet the quality requirements, check the oil delivery pipe and gear oil pump, use lubricating oil that meets the quality requirements, and check and adjust the oil pump to make the pressure meet the requirements;
4. Clean and replace the new engine oil, adjust the oil pressure;
5. Replace the bearing bush with a new one;
6. The concentricity of the two machines must be positive, and the leveling tolerance value must comply with the value specified in the machine manual. Especially when the compressor and the motor are connected with a rigid connection, more attention should be paid to aligning
Post time: Jul-25-2023