Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

N/Zp
Z/pN
p/ZN
ZN/p

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Machine Design
The contact ratio is the ratio of

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

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