1. Insufficient or incorrect lubrication
- Lack of oil or insufficient lubrication: Bearing surfaces are not sufficiently lubricated, increasing friction and temperature.
- Incorrect grease or oil selection: Using a very viscous oil for high speeds, or grease with low temperature resistance for high temperatures, increases heating.
- Excessive lubrication: Too much grease can become trapped and create friction within the bearing.
2. Excessive load and impacts
- Loads greater than normal or impact forces on the bearing stress the bearing elements, increasing friction and leading to heating.
- This also includes axial or radial loads resulting from incorrect mounting.
3. High speed
- As bearing speed increases, friction and centrifugal effect increase.
- If low-viscosity oil or synthetic grease is not used at high speeds, heating will rapidly increase.
4. Bearing damage or mounting error
- Incorrect mounting: Tight/loose fit, axial misalignment, or using the wrong bearing type can cause heating.
- Wear or surface damage: Surface degradation such as pitting, scratches, or cracks increases friction.
5. External factors
- Contamination: Dust, dirt, or water degrades the oil film and increases friction.
- Hot environment: If the external ambient temperature is very high, the bearing will naturally heat up faster.
6. Electrical effects (especially in motor bearings)
- Inverter-controlled motors or AC motors can have electrical current passing through the bearing, which can cause micropitting and heating on the bearing surface.
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