Question

A ball bearing is subjected to the aradial load of 10 kN, and an axial load 4 kN. The shaft rotates at 1200 r.p.m with average life of 5000 hr. is desired inner race rotation. The service factor is 1.5, $X=0.48,Y=1.3,V=1.$

Dynamic load is _____ .

Answer 1

$F_r=10kN,F_a=4kN,N=1200\text{rpm}$

$L_{90}=\text{5000 hr = 360 million revolutions}$

$P_e=S(XV{F}_r+V{F}_a)$

$S=1.5,X=0.48,Y=1.3,V=1$

$P_e=15kN,$

$L_{90}=\left(\frac{C}{P_e}\right)\Rightarrow C=106.70kN$