Wednesday, 20 June 2012

Oil distribution in bearing

Oil distribution in bearing
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If the maximum radial clearance is Cr
then Cr = e + Hm
where e is the eccentricity between the shaft and bearing centreline and Hm is the minimum clearance (oil film thickness)
an eccentricity factor can be calculated from
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 and oil flow through the loaded region. The latter three determine the temperature of the bearing which for high speed bearings can be a limiting factor.

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