Machine Design
In hydrodynamic bearings

The oil film is maintained by supplying oil under pressure
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

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

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