Satisfactory bearing performance can be achieved by adopting the lubricating method which is most suitable for the particular application and operating conditions. In general, oil offers superior lubrication; however, grease lubrication allows a simpler structure around the bearings. A comparison of grease and oil lubrication is given in the table.
| Item |
Grease Lubrication |
Oil Lubrication |
Housing Structure and
Sealing Method |
Simple |
May be complex.
Careful maintenance
required. |
| Speed |
Limiting speed is 65% to 80% of that with oil lubrication. |
In comparison with
grease lubrication, has a higher limiting speed. |
| Cooling Effect |
Poor |
Heat transfer is possible using forced oil
circulation. |
| Fluidity |
Poor |
Good |
Full Lubricant
Replacement |
Sometimes difficult |
Easy |
Removal of Foreign
Matter |
Removal of particles
from grease is
impossible. |
Easy |
External
Contamination due
to Leakage |
Surroundings seldom
contaminated by
leakage. |
Often leaks without
proper
countermeasures.
Not suitable if external contamination must be avoided. |
