In view of the fault of ball bearing in a liquid rocket engine turbopump during the experiment

the failure mechanism of bearing was analyzed

the key structural parameters of bearing were optimized. The contact stress

contact angle

spin-to-roll ratio

slip ratio of cage and orbit trajectory of cage’s centroid were compared and analyzed by means of SARB (simulation and analysis of rolling bearings) software. Experiment was done to verify the improvement and the dynamic analysis results of ball bearing. Results showed that after the structural parameters of the bearing were improved

the contact angle between steel ball and inner ring was reduced

the cage slip rate declined from 10% to 4%

and the spin-to-roll ratio and slip speed were reduced

and the stability of steel ball and cage was improved.