Theory of Machine
In a hydrodynamic journal bearing, there is

A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
No lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

One lower pair and two additional links
Two lower pairs and one additional link
Any one of these
Two lower pairs and two additional links

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