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12-3 A journal bearing has a journal diameter of 3.000 in, with a unilateral tolerance of -0.001 in. The bushing bore has a diameter
12-3 A journal bearing has a journal diameter of 3.000 in, with a unilateral tolerance of -0.001 in. The bushing bore has a diameter of 3.005 in and a unilateral tolerance of 0.004 in. The bushing is 1.5 in long. The journal speed is 600 rev/min and the load is 800 lbf. For both SAE 10 and SAE 40, lubricants, find the minimum film thickness and the maximum film pressure for an operating temperature of 150F for the minimum clearance assembly. 12-8 A journal bearing has a shaft diameter of 75.00 mm with a unilateral tolerance of -0.02 mm. The bushing bore has a diameter of 75.10 mm with a unilateral tolerance of 0.06 mm. The bushing is 36 mm long and supports a load of 2 kN. The journal speed is 720 rev/min. For the minimum clearance assembly find the minimum film thickness, the heat loss rate, and the maximum lubricant pressure for SAE 20 and SAE 40 lubricants operating at an average film temperature of 60C. 12-12 A set of sleeve bearings has a specification of shaft journal diameter of 1.250 in with a unilateral tolerance of -0.001 in. The bushing bore has a diameter of 1.252 in with a unilateral tolerance of 0.003 in. The bushing is 1 in long. The radial load is 250 lbf and the shaft rotational speed is 1750 rev/min. The lubricant is SAE 10 oil and the axial-groove sump temperature at steady state T, is 120F. For the Cmin only assemblies analyze the bearings and observe the changes in S, , f, Q, Qs, AT, Tmax, Tf, and ho.
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