Question

Solve following questions: (Reference : Machine Design - Book by J.K. Gupta and R.S. Khurmi )

5. A single row deep groove ball bearing operating at 2000 r.p.m. is acted by a 10 kN radial load and 8 kN thrust load. The bearing is subjected to a light shock load and the outer ring is rotating. Deter mine the rating life of the bearing A ball bearing operates on the following work cycle [Ans. 15.52 x 10° rev] 6. Element No Radial load Element time eed 3000 7000 5000 30 40 30 720 1440 900 The dynamic load capacity of the bearing is 16 600 N. Calculate 1. the average speed of rotation 2. the equivalent radial load; and 3. the bearing life [Ans. 1062 .p.m. ; 6.067 kN ; 20.5% 100 rev]

Answer 1

Given dota Q.G elimunt Radispeed Elmunal Revolution in limu [clemuntal ime load NO (rpm) 3000 720 0-3x120 216 O.3 7000 1440 576 /440メ0.4 SO0D 900 900x0.3 ะ 270 1062 6) Avg speed of rotation ) 1062 YPM Eivolent adial load 216x3000, 576 x 70OU +讠10x 5000 1062 For bail bearing 6061N 6.061 KN Qn) 16 600 Rated lite CL10 6067 20.5 xio6 rev

Given data WR10,000 N WAs0oo pm WA .8000 WR 0000 0.8 From tables , x- Y-O J v -) 036 Xx 10,00 d tife of bcaring- x l0 For ball bearing, k - 3 In problem dala vegarding d^namic lood carrying capacity s missing from słandard!, c 25 K N 25000 10000 5.62x 106 1 rev