The precautions for using Class II cylindrical roller bearings mainly include the following aspects:

1、 Installation and disassembly

Cleaning and inspection: Before installation, ensure that the bearings and their installation environment are clean and free of impurities.

Check the bearings for any damage or defects, such as cracks, scratches, etc.

Proper use of tools: During installation, special tools should be used to press the bearings flat and evenly, avoiding using a hammer to directly strike the bearings to prevent damage or improper installation.

When disassembling, a suitable puller should also be used to pull out the bearing, avoiding using tools such as chisels and hammers to strike the bearing.

Match size: Ensure that the fit size between the bearing seat ring and the seat hole is correct, avoiding being too tight or too loose. When the fit is loose, the seat hole should be repaired or the bearing should be replaced to avoid forced use using methods such as punching holes or copper pads.

2、 Lubrication

Lubricant selection: Choose the appropriate lubricant based on the working conditions and requirements of the bearing. There are two commonly used lubricants: lubricating oil and lubricating grease.

When the circumferential speed of the shaft is less than 4-5m/s, or in parts of the car that cannot be lubricated with lubricating oil, lubricating grease is often used for lubrication. The advantage of grease lubrication is that the sealing structure is simple, the grease is not easily lost, and it is not greatly affected by temperature.

The advantages of lubricating oil lubrication are low frictional resistance and the ability to dissipate heat, making it suitable for bearings in high-speed and high-temperature working environments.

Moderate addition: Both lubricating grease and lubricating oil should be added in accordance with the instructions. Excessive or insufficient lubricant may have adverse effects on bearings.

For lubricating grease, it is generally advisable to only fill 1/2-1/3 of the bearing cavity; For lubricating oil, it should be added to the specified markings or level with the oil filling port.

3、 Operation and maintenance

Temperature monitoring: During the operation of the mechanism, the temperature of the bearings should be regularly monitored. When touching the outer shell of the mechanism with your hands, it is normal not to feel hot. If the temperature is too high, it may indicate that there is a problem with the bearing or poor lubrication.

Noise inspection: The bearing is allowed to have slight operating noise during operation, but if the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty. It should be stopped in a timely manner for inspection and handling.

Regular inspection and maintenance: Regularly inspect and maintain bearings, including checking lubrication status, wear, sealing, etc. If any problems are found, they should be dealt with in a timely manner to avoid the expansion of the fault or the impact on the normal operation of the equipment.

4、 Other precautions

Avoid overload: Ensure that the bearing operates within the rated load range and avoid bearing damage caused by overload.

Pollution prevention: Keep the bearings and their surrounding environment clean to prevent dust, moisture, and other pollutants from entering the interior of the bearings.

Proper storage: Bearings should be stored away from adverse environments such as direct sunlight, high temperatures, and humidity to prevent damage or performance degradation.

In summary, the precautions for the use of Class II cylindrical roller bearings involve multiple aspects such as installation and disassembly, lubrication, operation, and maintenance. Only by strictly following the requirements for operation and maintenance can the normal operation of bearings be ensured and their service life be extended.