Machine Design
In hydrodynamic bearings

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

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Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is subjected to a higher stress than the outer side
It is subjected to a higher cyclic loading than the outer side
It has a lower curvature than the outer side
It is more stretched than the outer side during the manufacturing process

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Machine Design
The contact ratio is the ratio of

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

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