Minimum Film Thickness and Eccentricity Ratio 1.0 0.9 0.1 08 TA 0.2 0.7 03 06 04 Minimum film thickness variable dimensi
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Minimum Film Thickness and Eccentricity Ratio 1.0 0.9 0.1 08 TA 0.2 0.7 03 06 04 Minimum film thickness variable dimensionless) 05 0.5 Eccentricity ratio e (dimensionless) 0.4 0.6 14 03 0.7 0.2 0.8 0.1 0.9 0 001 0.02 0.04 0.06 0.08 0.1 0.2 04 2 4 1.0 8 10 0.6 0.8 1.0 AN Bearing characteristic number,s- Position of Minimum Film Thickness 100 90 80 70 1/d=00 60 Position of minimum film thickness (deg) 50 1/2 40 30 1/4 20 10 0 0 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 2 2 4 6 8 10 Bearing characteristic number, S = (9) N
Coefficient of Friction Variable 102 5 4 3 2 Coefficient-of-friction variable dimensionless) 10 I/d = 1/4 1/2 5 1 4 00 2 1 0.01 0.02 2 4 6 8 10 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 AN Bearing characteristic number, S= P (9) Maximum film pressure 1.0 0.9 1/d=00 - 1 - - -- - - 1 - 1 - 1 1 0.8 psig 0.7 0.6 1 0.5 1 Maximum-film-pressure ratione 1.4 1/2 0.3 1/4 0.2 0.1 0 | 0 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 Bearing characteristic number, S = -(
Position of maximum film pressure 100 25 1/2 90 1/4 90 20 70 60 15 1/4 Terminating position of film, deg) 50 Position of maximum film pressure, (deg) 40 0 1/2 50 20 10 0 0.01 0.02 0.04 0.06 0.08 0.1 0.2 0.4 6 0 8 10 Bearing characteristic number, 5-9 0.6 0.8 1.0 2N P "Keyway" sump Oilfill hole Bushing (bearing) Journal (shaft) U Side leakage negligible А Section A-A (flow) Cavitating film region Journal 0
Dynamic Viscosity vs Temperature for different lubricants 104 5 3 2 10 5 3 2 102 5 4 3 2 SAE 70 10 5 4 40 30 20 Dynamic viscosity (greyn) 3 10 2 1 0.5 0.4 0.3 0.2 30 50 200 250 300 100 150 Temperature (°F) Source: Raimondi and Boyd.
10-3 10-4 Castor oil SAE 30 oil 10-5 Dynamic viscosity, reyn 10-6 10-7 Water Gasoline 10-8 Air 10-9 0 50 100 150 200 Temperature, °F