Lubrication |
Why Lubrication is required?
The main objective of lubrication is to prevent metal-to-metal contact between the bearing rings and the rolling elements by means of a lubricant film. In this way wear and premature rolling bearing fatigue are avoided. In addition, lubrication reduces the development of noise and friction, thus improving the operating characteristics of bearing. Additional functions may include protection against corrosion and heat dissipation from bearing.
Usually, bearing are lubricated with grease or oil; in rare cases e.g where very high temperatures are involved, dry lubricants are used. |
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Lubrication Types:-
1. Grease Lubrication
Grease lubrication is used for about 90% of all rolling bearings.
The main advantage of grease lubrications are:
- A very simple design.
- It enhances the sealing effect.
- Long service life but little maintenance is required.
With normal operating and environmental conditions, for – life grease lubrication is often possible. If a bearing is heavely stressed (load, speed, temperature), suitable re-lubrication intervals must be scheduled. |
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| 2. Oil Lubrication
Oil Lubrication is the obvious solution for applications where adjacent machine elements are already supplied with oil or where heat has to be removed by means of the lubricant. Eat can be removed by circulating substantial oil volume. It may be required where high loads and/or high speeds have to be accommodated or where the bearings are exposed to external heating. With oil throwaway lubrication e.g. Oil-mist-lubrication or oil-air-lubrication, the bearing friction is kept low. |
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