分片式可变间隙径向滑动轴承混合润滑研究  

Mixed Lubrication of Multi-Pad Journal Bearing with Variable Clearance

作　　者：罗庆 董庆兵[1,2] 赵滨 魏静 杨海师[4] LUO Qing;DONG Qingbing;ZHAO Bin;WEI Jing;YANG Haishi(State Key Laboratory of Mechanical Transmissions,Chongqing University,Chongqing 400044,China;College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China;College of Power and Energy Engineering,Harbin Engineering University,Heilongjiang Harbin 150001,China;Chongqing Gearbox Co,Ltd,Chongqing 402263,China)

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]重庆大学机械与运载工程学院,重庆400044 [3]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [4]重庆齿轮箱有限责任公司,重庆402263

出　　处：《摩擦学学报》2023年第11期1285-1298,共14页Tribology

基　　金：重点研发计划项目(2020YFB2010100);国家自然科学基金项目(52271312);机械传动国家重点实验室自主项目(SKLMTMSKFKT-202211)资助。

摘　　要：径向滑动轴承因其高可靠性被广泛应用于大型轴承-转子系统,但恶劣工况下常因润滑不良造成局部区域固体直接接触,即混合润滑,导致轴承系统提前失效.本文中以某大型核电循环泵齿轮箱中分片式可变间隙径向滑动轴承为研究对象,耦合弹性流体动压润滑模型和表面粗糙峰接触模型,并计入分体式轴承不连续承载特性,建立了考虑轴颈倾斜的分片式可变间隙径向滑动轴承混合润滑模型.采用有限差分法和影响系数法数值解析轴承表面油膜压力、接触压力和油膜厚度等特征量,研究了轴承间隙、轴颈倾斜和转速等因素对滑动轴承系统润滑性能的影响,并揭示了分片式可变间隙径向滑动轴承摩擦学特征.研究表明,轴承载荷主要由部分特定轴承片支撑,且各因素对轴承片载荷比率影响不同,其中轴颈倾斜对润滑性能影响最为显著,恶劣工况下轴承间隙较小一侧率先发生固体直接接触,导致轴承边缘最易发生严重磨损;合理地调整各轴承片间隙可有效地改善轴承表面油膜压力分布,有利于提高轴承系统承载能力,并降低轴承表面发生过度磨损风险,为实现最优润滑方案提供了理论依据.The lubrication is essentially important to enhance the anti-tribology abilities of the journal bearing by forming a thin film to separate the contact surface.However,the journal bearing usually works under severe operating conditions,and the journal misalignment may happen due to various reasons,such as the induced errors during the manufacturing/installation process and uneven deformation caused by the non-uniform distributed load,especially for those journal bearings used in heavy-duty machinery.Whenever the thin lubrication film cannot afford to carry out the loading,solid-solid contact occurs,which is usually referred to as mixed lubrication.In this paper,a multi-pads journal bearing used in the planetary gearbox of the circulating water pump at nuclear power plant was focused on and the safe application of nuclear energy requiring the bearing to have a reliable ability to maintain the rotating motion of gear sets,and the lubrication in such a bearing system deserved special attention.A numerical mixed lubrication model with misaligned journal involved was thus established by connecting the elastohydrodynamic lubrication and the asperity contact.The equation of film thickness for each pad was properly formulated and the influence coefficient method was also employed to estimate the elastic deformation of each pad surface,which was then introduced to update the film thickness equation.The average Reynolds equation that governed the lubrication pressure was discretized by the finite difference method and solved based on the pre-specified boundary conditions.Later,the solid direct contact pressure was obtained through the asperity contact model.The developed numerical model was well validated by comparing the simulation results with those reported in references.Then,the lubrication performance of multi-pad journal bearing with variable clearance under different operation conditions was investigated,and the effects of various factors,including journal bearing clearance,misaligned journal angle and rotating speed

关 键 词：分片式径向滑动轴承 可变间隙 轴颈倾斜 混合润滑 载荷比率 

分 类 号：TH132.413[机械工程—机械制造及自动化]