保持架过梁断裂前后球轴承的动力学行为分析  

Dynamic behavior analysis of ball bearings before and after cage lintel fracture

作　　者：房晓辉 徐自力[1] 王珺 黄金平 FANG Xiaohui;XU Zili;WANG Jun;HUANG Jinping(State key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University,Xi'an 710049,China;Science and Technology on Liquid Rocket Engine Laboratory,Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,陕西西安710049 [2]西安航天动力研究所液体火箭发动机技术重点实验室,陕西西安710100

出　　处：《火箭推进》2023年第6期21-30,共10页Journal of Rocket Propulsion

基　　金：科工局稳定支持项目(HTKJ2020KL011007);基础研究项目(11S2020KT12)。

摘　　要：火箭涡轮泵中的球轴承保持架过梁断裂情况时有发生,严重时甚至影响涡轮泵系统的正常运行。为了及时有效地预测球轴承保持架断裂故障,考虑断裂保持架和滚珠及引导外圈之间的碰磨与接触作用,建立了断裂保持架的运动微分方程并通过显式有限元法进行求解;对某涡轮泵球轴承在过梁断裂前后的动力学行为进行了计算和对比,研究了保持架过梁断裂对瞬时作用力、打滑率、磨损、最大PV值的影响。结果表明:保持架过梁断裂显著增大了保持架与外圈之间的作用力,瞬时作用力最大值增大了29.81;保持架的打滑率、保持架导向面的磨损及最大PV值均大幅增大;保持架过梁断裂位置处的滚珠之间存在大幅值的瞬时碰撞力,滚珠存在明显打滑,打滑率达14.06。The fracture of the ball bearing cage lintel in rocket turbo-pump occurs from time to time and even affects the normal operation of the turbo-pump system.In order to predict the fracture failure of ball bearing cage timely and effectively,considering the friction and contact effects between the fracture cage,ball bearing and guide ring,the motion differential equation of fracture cage was established and solved by explicit finite element method.The dynamic behavior of a turbo-pump ball bearing before and after the lintel fracture were calculated and compared,and the effects of cage lintel fracture on instantaneous force,slip rate,wear and maximum PV value were studied.The results show that the fracture of the cage lintel significantly increases the force between the cage and the outer ring,and the maximum instantaneous force increases by 29.81.The slip rate of cage,the wear of cage guide surface and the maximum PV value increase greatly.There is a large instantaneous impact force between the ball bearings at the fracture position of the cage lintel,and the ball has obvious slippage,with a slip rate of 14.06.

关 键 词：涡轮泵球轴承 保持架断裂 显式有限元 打滑率 瞬时作用力 

分 类 号：V431[航空宇航科学与技术—航空宇航推进理论与工程]