Machine Design
The contact ratio is the ratio of

Length of arc of approach to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch

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Machine Design
In hydrodynamic bearings

The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
Grease is used for lubrication
The oil film is maintained by supplying oil under pressure

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