OIL DISTRIBUTION WITHIN A JOURNAL BEARING

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If the maximum radial clearance is Cr

then Cr = e + Hm

where e is the eccentricity between the shaft & bearing centreline and Hm is the minimum clearance(oil film thickness)

an eccentricity factor can be calculated from the formula

n = e / Cr

Factors involved with the eccentricity factor n are; minimum oil film thickness, journal attitude angle, pressure distribution, peak pressure angle, friction, horsepower loss & oil flow through the loaded region. The latter three determine the temperature of the bearing which for the high speed bearings can be a limiting factor.