Machine Design
In hydrodynamic bearings

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

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Machine Design
Crowning on pulley helps

In increasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
To increase pulley life
In decreasing the slip of the belt

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