Machine Design
In a hydrodynamic lubricated bearing

The lubricant is forced between the journal and the bearing, by external pressure
There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal

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