MCKEE Investigation
It is done for hydro-dynamic bearing.
Transition Graph From Thin Film to Thick Film
Bearing characteristic number = μN/p, it is dimensionless.
Here, P = Unit bearing pressure
μ = Absolute viscosity
N = Speed (RPM)
At point C, viscosity is minimum.
- The value of bearing characteristic number corresponding to minimum value of coefficient of friction is called bearing modulus (K).
- Bearing should not be operated near critical value of ‘k’ because slight drop in the speed, or increase in load
results in boundary lubrication.
Ideally it should be 5 K , but for impact fluctuating load it is 15 K.
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