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1 1. A full journal bearing has a journal diameter of 25 mm, clearance 0.015 mm, and ratio of 12. The load is 1.2 kN and the journal runs at 1100 rev/min. If the viscosity is 55 mPa.s, find (a) minimum film thickness, (b) coefficient of friction, (c) torque to overcome friction, and (d) power loss to friction.

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