Interpretation Of Basic Knowledge Of Bearing Maintenance

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

In order to extend the service life of the bearings, the following are the elements that should be paid attention to during the installation and use of the motor:

1. Installation of coupling

When using a coupling to connect the motor and equipment, it is necessary to avoid damage to the bearings caused by the axial force generated during the installation process. It is recommended that for interference fit dimensions, use thermal sleeves or install them on the shaft end face of the non-shaft extension end to protect the bearings from large axial forces.

2. Lubrication of bearings

About 36% of bearing damage is caused by poor lubrication or improper use of grease. Small and medium-sized motors (80-355) should change the grease after six months of continuous operation. When it is found that the grease has deteriorated or the bearing is hot, the grease should be replaced immediately. When replacing, remove the old grease and clean the bearing and bearing cap, 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 operating environment of the motor must meet the requirements of the protection level.

4. Fatigue

Overloading, improper use or poor maintenance can affect bearings, and research shows that 34% of premature bearing failures are caused by fatigue. Therefore, the motor should be operated under rated conditions to avoid overloading.