Transcription of The SKF model for calculating the frictional moment
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The SKF model for calculating the frictional moment
The SKF model for calculating the frictional moment The SKF model for calculating Zone 2 Mixed lubrication condition, in which a separating oil film carries part of the frictional moment the load, with fewer asperities in contact, Bearing friction is not constant and depends and so friction decreases. on certain tribological phenomena that occur Zone 3 Full film lubrication condition, in in the lubricant film between the rolling ele- which the lubricant film carries the load, but ments, raceways and cages. with increased viscous losses, and so fric- Diagram 1 shows how friction changes, as a tion increases. function of speed, in a bearing with a given Zone 4 Full film lubrication with thermal lubricant. Four zones are distinguishable: and starvation effects, in which the inlet shear heating and kinematic replenishment Zone 1 Boundary layer lubrication condi- reduction factors compensate partially for tion, in which only the asperities carry the the viscous losses, and so friction evens off.
ments, raceways and cages. Diagram 1 shows how friction changes, as a function of speed, in a bearing with a given lubricant. Four zones are distinguishable: Zone 1 – Boundary layer lubrication condi - tion, in which only the asperities carry the load, and so friction between the moving surfaces is high. Zone 2 – Mixed lubrication condition, in
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