Question

For the bearing application specification of radial load 2 kN, design life ${10}^9$ rev. and desired reliability 90%, determine the basic load rating for ball bearing.

• A. 10 kN
• B. 21 kN
• C. 20 kN
• D. 35 kN

Answer 1

The correct option is C 20 kN

$F_D=2kN,$

$L_D={10}^{9}rev$

$R=0.90$

$C_{10}=F_D{\left(\frac{L_D}{L_R}\right)}^{\frac{1}{3}}$

$2\times {\left(\frac{{10}^9}{{10}^6}\right)}^{\frac{1}{3}}=20kN$