Their role on the bearings, to create an oil film to separate the bearing shaft with hydrodynamic lubrication. The lack of bearing clearance prevents formation of the oil film. Metal metal contacts are possible. A scraping of bearings in case of falling bearing clearances is recommended.
Bearing contact pattern
They must not exceed the following value:
- For holder bearings of mills, 1/5 of holding surface
- For the kilns, 1/6 of holding surface
- For the pinion bearings, 1/4 of holding surface