Lubrication increases bearing life in most operating environments. The positive
effects of lubrication may be summarized as follows:
- A lubricant film reduces friction and wear between the balls and raceways of the bearing, extending fatigue life.
- Dissipates frictional heat and can provide additional cooling if lubricant is circulated.
- Guards against corrosion and may help prevent foreign material from entering the bearing.
In addition to these general benefits, a good lubricant should have the following intrinsic properties:
- Resists change in structure or consistency during prolonged service.
- Resists excessive viscosity changes at temperature extremes.
- Resists leakage, dripping or throw-off from rotating surfaces.
- Compatibility with materials used in bearings, particularly seals and retainers.
- Tolerate some contamination, including moisture, without loss of characteristics.
Other factors that are affected by lubricant choice include:
- Noise level
- Maximum operating speed
- Torque
- Storage time (shelf life)