Question

A bearing has a specific dynamic radial capacity of 40 kN. The desired life is 5000 hours for 90% of the bearings. The equivalent radial load at 400 rev/min is

• A. 8.11 kN
• B. 12.56 kN
• C. 9.43 kN
• D. 10.27 kN

Answer 1

The correct option is A 8.11 kN

$\text{C = 40 kN, L}{}_{90}\text{= 5000 hour}$

$L_{90}\text{= 120 million revolutions}$

$\text{we known that,}{L}_{90}={\left(\frac{C}{P_e}\right)}^3=120\text{million revolutions}$

$P_e=8.10kN$