【November 15】One question per day

1. The bearing and journal fit unevenly or the contact surface is too small (fitting gap is too small), and the specific pressure per unit area is too large. This situation mostly occurs after the trial operation of a new machine or the replacement of a new bearing.； 2. Bearing deflection or crankshaft bending or twisting ； 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, causing the bearing bush to be short of oil and causing dry friction. ； 4. There are debris in the bearing or too much lubricating oil, or the lubricating oil is too dirty. ； 5. The bearing bush has uneven and excessive wear. ； 6. When the compressor was installed, the coupling between the main shaft and the main shaft of the electric motor (or diesel engine) was not aligned, and the error was too large, causing the two axes to tilt.

The quality of the lubricating oil is inconsistent (low viscosity) or the oil circuit is clogged. The oil supply pressure of the gear oil pump is too low and the bearing quality is poor. And the oil supply is interrupted, causing the bearing to be short of oil and causing dry friction. ； The bearing and journal fit unevenly or the contact surface is too small (fitting gap is too small) and the specific pressure per unit area is too large. The coupling between the main shaft and the motor main shaft is not aligned when the compressor is installed. causing the two axes to tilt.

1． Lack of oil or oil outage. If the fuel supply system fails: For example, if the oil pump fails, the oil pipe breaks, the oil pipeline is blocked, the oil filter is clogged, etc., the amount of oil input to the bearing bush is reduced or interrupted 2. The lubricating oil is not up to standard. If there are sticky substances in the oil, the lubricating oil will be unevenly distributed on the friction surface. ； If the moisture content is high, the oil film will be destroyed. ； If the viscosity is too low, it is difficult to form an oil film ； The viscosity is too high and cannot be evenly distributed over the entire surface of the friction parts. ； In short, if the quality of the oil is not up to standard, the lubrication effect will be reduced 3. After maintenance, the iron filings and impurities stuck to the lubricated part of the bearing bush have not been removed. 4． Poor installation quality. If the assembly is too tight and the bearing gap is too small, a uniform oil film cannot be formed between the two friction contact surfaces 5. The quality of maintenance is poor. If the bearing bush is not ground and scraped well, the deflection of the bearing bush does not match well with the journal during installation, and the bearing bush is not fixed properly, it will cause axial movement and radial movement, resulting in uneven stress on the bearing bush and an increase in the pressure on the unit friction surface. 6. The bearing quality is poor.

Mainly caused by friction and heat, with the bearing seat and the shaft.

This post was last edited by shiguomiao on 2009-11-26 14:29 The main reasons for bearing heating should be the following aspects: 1. Assembly clearance 2. Crankshaft or bearing bush eccentric wear 3. Crankshaft deformation 4. There is a problem with the quantity and quality of the lubricating oil 5. There is a problem with the corresponding row of cylinders, pistons, piston rings, and valves. The above reasons may cause the bearing to heat up.

1. Poor lubrication effect 2. Damage to the slide 3. Equipment failure

1． Lack of oil or oil outage. If the fuel supply system fails: For example, if the oil pump fails, the oil pipe breaks, the oil pipeline is blocked, the oil filter is clogged, etc., the amount of oil input to the bearing bush is reduced or interrupted 2. The lubricating oil is not up to standard. If there are sticky substances in the oil, the lubricating oil will be unevenly distributed on the friction surface. ； If the moisture content is high, the oil film will be destroyed. ； If the viscosity is too low, it is difficult to form an oil film ； The viscosity is too high and cannot be evenly distributed over the entire surface of the friction parts. ； In short, if the quality of the oil is not up to standard, the lubrication effect will be reduced 3. After maintenance, the iron filings and impurities stuck to the lubricated part of the bearing bush have not been removed. 4． Poor installation quality. If the assembly is too tight and the bearing gap is too small, a uniform oil film cannot be formed between the two friction contact surfaces 5. The quality of maintenance is poor. If the bearing bush is not ground and scraped well, the deflection of the bearing bush does not match well with the journal during installation, and the bearing bush is not fixed properly, it will cause axial movement and radial movement, resulting in uneven stress on the bearing bush and an increase in the pressure on the unit friction surface. 6. The bearing quality is poor.

The quality of the lubricating oil is inconsistent (low viscosity) or the oil circuit is clogged. The oil supply pressure of the gear oil pump is too low and the bearing quality is poor. And the oil supply is interrupted, causing the bearing to be short of oil and causing dry friction. ；

a. When the compressor is installed, the coupling between the main shaft and the main shaft of the electric motor (or diesel engine) is not aligned, and the error is too large, causing the two axes to tilt. b. The quality of the bearing bush is poor, 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, causing the bearing bush to be short of oil and causing dry friction. ； c. Bearing deflection or crankshaft bending or twisting ； d. The bearing and journal fit unevenly or the contact surface is too small (fitting gap is too small), and the specific pressure per unit area is too large. This situation mostly occurs after the trial operation of a new machine or the replacement of a new bearing. ； e. The bearing bush has uneven and excessive wear. ； f. There are debris in the bearing or too much lubricating oil, or the lubricating oil is too dirty. ； Troubleshooting: a. Appropriately adjust the matching clearance, check the bending and twisting of the crankshaft, and replace the crankshaft with a new one or repair it as appropriate. ； b. Use bearings that meet the quality requirements, check the oil pipeline and gear oil pump, use lubricating oil that meets the quality requirements, and check and adjust the oil pump to ensure that the pressure meets the requirements. ； c. The concentricity of the two machines must be correct, and the tolerance value of the leveling must comply with the value specified in the machine manual. Especially when the compressor and motor are connected with a rigid connection, more attention should be paid to alignment. d. Replace with new bearing bush ； e. 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. ； f. Clean and replace the engine oil with new one, and adjust the oil pressure. ；

1. Assembly clearance 2. The center of the crankshaft is not allowed or the bearing bush is eccentrically worn 3. The crankshaft is deformed 4. There is a problem with the quantity and quality of the lubricating oil 5. High oil temperature causes dry friction