The lubrication method and the lubricant have
a direct effect on the bearing life, therefore the most suitable
lubrication must be selected for each application. Effects
of lubrication are described below as follows:
Decrease of Friction and Abrasion
Lubrication decreases rolling friction between the raceway
and the rolling elements, sliding friction between the rolling
elements and cage slide friction of guide surface between
the cage and the bearing ring.
Lubrication also dissipates heat generated inside the bearing
as well as heat conducted from the outside, thus preventing
overheating of the bearing and deterioration of the lubricant.
The addition of lubrication prevents corrosion of rolling
elements, bearing rings and cages and also prevents the ingress
of contaminants and moisture into the bearing.
Some required characteristics of lubricants:
- Low friction and abrasion
- High stability against heat, good thermal conductivity
- Strong oil film
- Non-corrosive
- Provide a good barrier against dust and moisture
- Maintain a stable viscosity
There are two types of lubricant: oil or grease. It is important
to select a lubricant and a lubricant method for each application
and its conditions.
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Lubrication:
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