Interpretation of the basic knowledge of bearing maintenance

Bearings are one of the most vulnerable parts in small and medium-sized motors. Bearing damage may cause increased noise, vibration, temperature, reduced equipment accuracy, and even cause motor damage.

To extend the service life of bearings, the following are the factors that should be paid attention to during the installation and use of motors:

1. Coupling installation

When using a coupling to connect the motor to the equipment, it is necessary to avoid damage to the bearing caused by the axial force generated during the installation process. It is recommended to use a shrink sleeve or install the shaft end face on the non-shaft extension end for interference fit sizes to protect the bearing from large axial forces.

2. Bearing lubrication

About 36% of bearing damage is caused by poor lubrication or improper use of grease. Small and medium-sized motors (80-355) should replace grease after six months of continuous operation. When the grease is found to be deteriorating or the bearing is hot, the grease should be replaced immediately. When replacing, remove the old grease and clean the bearing and bearing cover, and then add an appropriate amount of new grease to fill 1/3--2/3 of the bearing chamber space.

3. Pollution

Bearings are precision parts, and contamination will affect their normal operation. Therefore, the use environment of the motor must meet the requirements of the protection level.

4. Fatigue

Overload, improper use or poor maintenance can affect bearings. Studies have shown that 34% of premature bearing failures are caused by fatigue. Therefore, the motor should be operated under rated conditions and avoid overload.

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