Radial Bearings
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Lubricant selection is of critical importance for the performance of a ball
bearing. It affects Life, Torque, Speed, Noise, Grease migration,
Outgassing, Temperature effects and rust prevention.
The two basic types of lubricants available are oil and grease.
Oil Lubricants
- Applications that require extremely low torque or narrow range of
torque variation, are suited to use oil as a lubricant.
Grease Lubricants
- Greases are comprised of a base oil and a thickener. The life
obtained from greases is considerably greater than that of just oil.
This is because of a continuous mechanism of lubrication by base oil
separation coming from the construction of the thickener.
- Calculating grease life and performance in sealed-for-life ball
bearings includes many complicated factors, such that grease life
calculation formulas in the industry at this time will likely show
different results than actual life.
- In recent years, using plastic material around the bearing has become
more common, so the proper selection of lubricant is even more critical
to prevent compatibility issues.
- Miniature and instrument ball bearings are typically filled with a
30% (±5%) by volume fill quantity.
