Simple bearing friction force calculation

[Donnis]

Hi everybody,

could anybody help me to remember hot to calculate the friction force value in a simple bearing system (a spindle in a bearing)?

 

[electricpete]

I'm not sure what bearing type your talking about. For rolling element bearings, SKF gives coefficient of friction values.

Excerpt from SKF Interactive bearing catalog for rolling element bearings:

"Under certain conditions (bearing load P » 0,1 C, good lubrication, normal operating conditions) the frictional moment can be calculated with sufficient accuracy using a constant coefficient of friction µ from the following equation

M = 0,5 µ F d

where
M = frictional moment, Nmm
µ = coefficient of friction for bearing (Table 1)
F = bearing load, N
d = bearing bore diameter, mm"
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Table 1 gives mu depending on bearing type. For example deep groove bearings without seals, mu=0.0015

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[Maclean]

Hi!

I wonder how to keep on with the above analyses, to the calculation of medium/big size bearing lubrification requirements, i mean to estimate the generated heat as function of F and bearing type, can we have the clearance about the essencial aspects ? Thank you?

maclean