某液体火箭发动机涡轮泵球轴承故障机理及改进方案(已撤稿）

针对某型号液体火箭发动机涡轮泵球轴承在试验过程中出现的故障,在进行轴承故障机理分析的基础上,对轴承关键结构参数进行了改进,使用滚动轴承动力学分析软件SARB(simulation and analysis of rolling bearings)对比分析了改进前后轴承的接触应力、接触角、旋滚比、保持架打滑率和质心轨迹等性能参数,并通过试验手段验证轴承改进方案和动力学分析结果的正确性。结果表明:轴承结构参数改进后,内接触角减小,保持架打滑率由10%下降到4%,钢球旋滚比和打滑速度均降低,钢球和保持架运转稳定性均提高。 

Failure mechanism and improvement of ball bearing in aliquid rocket engine turbopump

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.