A set of sleeve bearings has a journal of 31.25 mm dia with a unilateral tolerance of -0.025mm. The bushing has a diameter of 31.3 mm with a unilateral tolerance of 0.075 mm. The bearing length is 31.25 mm. The applied radial load on a shaft rotating at 1750 rpm is 1113 N. SAE 10 oil is used at axial groove, sump temperature at steady state of 49°C. For the maximum clearance assembly, find the magnitude and location of the minimum film thickness, the co-efficient of friction, the power loss rate, the side flow rate and total flow rate.
Define sommerfeld number and write down its significance.
A full journal bearing is 28 mm long. The shaft journal has diameter of 56 mm with unilateral tolerance of -0.012 mm. The bushing bore has diameter of 56.05 mm with unilateral tolerance of 0.012 mm. The load 2.4 kN and the journal speed is 900 rev/min. For the minimum clearance assembly, find the minimum oil film thickness and position of the minimum film thickness, if operating temperature is 65°C and SAE - 40 lubricating oil is used.
Design a full hydraudynamic journal bearing of journal diameter = 75 mm, radial load = 10 kN, journal speed = 1400 rpm, inlet temperature = 40∘C40^{\circ}\text{C}40∘C to satisfy minimum film thickness and radial clearance of 0.001r.
A full journal bearing has a shaft journal with a diameter of 1.25 in and a unilateral tolerance of -0.0006 in. The bushing bore has a diameter of 1.252 in with a unilateral tolerance of 0.0014 in. The bushing bore is 2 in long. The bearing load is 620 lbf and the journal rotates at 1120 rev/min. Analyze the minimum clearance assembly and find the minimum film thickness, the coefficient of friction.
A full journal bearing has a shaft diameter of 3.00 in with a unilateral tolerance of 0.0004 in. The l/d ratio is unity. The bushing has a bore diameter of 3.00 in with a unilateral tolerance of 0.0012 in. The SAE 40 oil supply in an axial groove sump with a steady state temperature of 140∘F140^{\circ}F140∘F. The radial load is 675 lbf. Estimate the average film temperature, the minimum film thickness and the head loss rate for the minimum clearance assembly, if the journal speed is 10 rev/s.