Question

The figure is a schematic drawing of a countershaft that supports two V-belt pulleys. Thecounterchae rpm and the bearings are to have manufacturer 2 in Table 11-6 The belt tension on the loose side of pulley runs at 2000 alife of 80 kh at a combined reliability of 0.98, assuming distribution data from A is f % of the tension on the tight side. GIVEN: W L andf- 19 a) Select deep-groove bearings from Table 11-2 for use at O and E, using an application factor of 1.2. b) Determine, if any, the range of w where pulley A can be placed on the shaft so that the bearings selected in part a) will remain valid to use at O and E. Dimensions in millimeters. 700-w 150 250 dia. 300 dia. 50 350 Table 11-2 Dimensions and Load Ratings for Single-Row 02-Series Deep-Groove and Angular-Contact Ball Bearings Fillet Bore,OD,Width, Radius Shoulder Load Ratings, kN Deep Groove Angular Contact 5.07 6.89 7.80 9.56 2.12 3.05 3.65 4.75 6.55 7.65 10 12.5 14.5 17.5 19.5 2.24 4.94 7.02 8.06 9.95 12 35 3.55 17 12 4.50 12.7 6.20 13.3 19.5 25.5 30.7 33.2 35.1 43.6 47.5 55.9 6.95 10.0 13.7 16.6 18.6 19.6 25.0 28.0 34.0 37.5 40.5 45.0 53.0 62.0 69.5 20.3 27.0 11.0 18.6 21.2 22.8 28.5 35.5 72 35.8 37.7 46.2 55.9 63.7 68.9 71.5 80.6 90.4 106 19 100 21 120 125 130 140 150 160 170 109 66.3 70.2 83.2 95.6 108 45.5 49.0 55.0 63.0 73.5 85.0 127 2.0 2.0 2.0 2.0 30 104 146 32 156

Answer 1

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