Question : (CO3:PO2 - C5, 50 marks) Geor 4:200T; m3 Pinion 2:30T; m-3 Bearing A ShaftI...

  

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Question : (CO3:PO2 - C5, 50 marks) Geor 4:200T; m÷3 Pinion 2:30T; m-3 Bearing A ShaftI Shaft 2 Gear 3: 100Tim-3 Powers 48kew Spead: 180oreu min Ceorl- SOT, m=3 BeaoringB 200mm 40OMM 200mm Figure 1 Figure 1 shows a power transmission system that consist of 4 gears, shafts and bearing. Choose a suitable ball bearing for ball bearings A and B with reliability goal of 0,90 and design life of 25,000 hours, from Table 11-2 that can withstand the input from gear 1 of 48kW and speed of 1800rev/min. For the purpose of calculation, the following information may be used: T allowable for shaft: 40MPA All gears have pressure angle, o = 20 ASME design code for shaft ASME design code: Combined shock and fatigue factors Stationary shaft Rotating shaft Type of load km kt km ke Gradualy applied load 1 1 1.5 1 Suddenly applied load, minor shock 1.5-2 1.5-2 1.5-2 1-1.5 Suddenly applied load, heavy shock 2-3 1.5-3 Torque (T) relation with respect to power and rotational speed : 70 24 x h p 9549 x k W N (R P M ) T N (R P M ) Table 11-2 : Table 11-2 Dimensions and Load Ratings for Single-Row 02-Series Deep-Groove and Angular-Contact Ball Bearings Fillet Shoulder Load Ratings, kN Deep Groove Co Bore, OD, Width, Radius, Diameter, mm Angular Contact "p 27 ds Go C0 mm mm mm mm 10 30 0.6 12.5 5.07 2.24 4.94 2.12 12 32 10 0.6 14.5 28 6.89 3.10 7.02 3.05 15 35 11 0.6 17.5 31 7.80 3.55 8.06 3.65 17 40 12 0.6 19.5 34 9.56 4.50 9.95 4.75 20 47 14 1.0 25 41 12.7 6.20 13.3 6.55 25 52 15 1.0 30 47 14.0 6.95 14.8 7.65 30 62 16 1.0 35 55 19.5 10.0 20.3 11.0 35 72 17 1.0 41 65 25.5 13.7 27.0 15.0 40 80 18 1.0 46 72 30.7 16.6 31.9 18.6 45 85 19 1.0 52 77 33.2 18.6 35.8 21.2 50 90 20 1.0 56 82 35.1 19.6 37.7 22.8 55 100 21 1.5 63 90 43.6 25.0 46.2 28.5 60 110 22 1.5 70 99 47.5 28.0 55.9 35.5 65 120 23 1.5 74 109 55.9 34.0 63.7 41.5 70 125 24 1.5 79 114 61.8 37.5 68.9 45.5 75 130 25 1.5 86 119 66.3 40.5 71.5 49.0 80 140 26 2.0 93 127 70.2 45.0 80.6 55.0 85 150 28 2.0 99 136 83.2 53.0 90.4 63.0 90 160 30 2.0 104 146 95.6 62.0 106 73.5 95 170 32 2.0 110 156 108 69.5 121 85.0 Question : (CO3:PO2 - C5, 50 marks) Geor 4:200T; m÷3 Pinion 2:30T; m-3 Bearing A ShaftI Shaft 2 Gear 3: 100Tim-3 Powers 48kew Spead: 180oreu min Ceorl- SOT, m=3 BeaoringB 200mm 40OMM 200mm Figure 1 Figure 1 shows a power transmission system that consist of 4 gears, shafts and bearing. Choose a suitable ball bearing for ball bearings A and B with reliability goal of 0,90 and design life of 25,000 hours, from Table 11-2 that can withstand the input from gear 1 of 48kW and speed of 1800rev/min. For the purpose of calculation, the following information may be used: T allowable for shaft: 40MPA All gears have pressure angle, o = 20 ASME design code for shaft ASME design code: Combined shock and fatigue factors Stationary shaft Rotating shaft Type of load km kt km ke Gradualy applied load 1 1 1.5 1 Suddenly applied load, minor shock 1.5-2 1.5-2 1.5-2 1-1.5 Suddenly applied load, heavy shock 2-3 1.5-3 Torque (T) relation with respect to power and rotational speed : 70 24 x h p 9549 x k W N (R P M ) T N (R P M ) Table 11-2 : Table 11-2 Dimensions and Load Ratings for Single-Row 02-Series Deep-Groove and Angular-Contact Ball Bearings Fillet Shoulder Load Ratings, kN Deep Groove Co Bore, OD, Width, Radius, Diameter, mm Angular Contact "p 27 ds Go C0 mm mm mm mm 10 30 0.6 12.5 5.07 2.24 4.94 2.12 12 32 10 0.6 14.5 28 6.89 3.10 7.02 3.05 15 35 11 0.6 17.5 31 7.80 3.55 8.06 3.65 17 40 12 0.6 19.5 34 9.56 4.50 9.95 4.75 20 47 14 1.0 25 41 12.7 6.20 13.3 6.55 25 52 15 1.0 30 47 14.0 6.95 14.8 7.65 30 62 16 1.0 35 55 19.5 10.0 20.3 11.0 35 72 17 1.0 41 65 25.5 13.7 27.0 15.0 40 80 18 1.0 46 72 30.7 16.6 31.9 18.6 45 85 19 1.0 52 77 33.2 18.6 35.8 21.2 50 90 20 1.0 56 82 35.1 19.6 37.7 22.8 55 100 21 1.5 63 90 43.6 25.0 46.2 28.5 60 110 22 1.5 70 99 47.5 28.0 55.9 35.5 65 120 23 1.5 74 109 55.9 34.0 63.7 41.5 70 125 24 1.5 79 114 61.8 37.5 68.9 45.5 75 130 25 1.5 86 119 66.3 40.5 71.5 49.0 80 140 26 2.0 93 127 70.2 45.0 80.6 55.0 85 150 28 2.0 99 136 83.2 53.0 90.4 63.0 90 160 30 2.0 104 146 95.6 62.0 106 73.5 95 170 32 2.0 110 156 108 69.5 121 85.0

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