塑料-金属复合轴瓦推力滑动轴承最小油膜厚度与功耗分析  

Analysis of the Minimum Oil Film Thickness and Power Consumption of Heavy-duty Thrust Sliding Bearings with PTFE-faced Pads

作　　者：苗建伟 谭庆昌 孙宝瑞 柴博森 赵京鹤[1] 王顺 MIAO Jianwei;TAN Qingchang;SUN Baorui;CHAI Bosen;ZHAO Jinghe;WANG Shun(School of Mechanical Engineering,Changchun Guanghua University,Changchun Jilin 130033,China;School of Mechanical and Aerospace Engineering,Jilin University,Changchun Jilin 130022,China;Sinotest Equipment Co.,Ltd.,Changchun Jilin 130012,China)

机构地区：[1]长春光华学院机械工程学院,吉林长春130033 [2]吉林大学机械与航空航天工程学院,吉林长春130022 [3]中机试验装备股份有限公司,吉林长春130012

出　　处：《润滑与密封》2025年第2期164-169,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(52075212);长春光华学院科研基金培育项目(QNXS2023024)。

摘　　要：聚四氟乙烯(Polytetrafluoroethylene,PTFE)与金属复合轴瓦存在尺寸大、PTFE强度低和表面能低等问题,制约润滑膜的形成。为提高重载塑料瓦推力滑动轴承的润滑性能,研究PTFE层厚度、润滑油入口区形状对成膜能力的影响。在考虑润滑油密度和黏度沿着油膜厚度方向的变化、双层材料轴瓦力变形和热变形的条件下,联立膜厚方程、Reynolds方程和能量方程,建立热流固耦合的推力滑动轴承3D润滑模型;对油膜和轴瓦的压力场和温度场进行数值模拟,分析PTFE层厚度、润滑油入口楔形区的高度和长度对最小膜厚和功耗影响。结果表明:随润滑油入口区楔形间隙长度增加,最小油膜厚度增大,功率损耗降低,当入口楔形区长度约为瓦块宽度的64%时,最小膜厚和功耗达到最佳值;随着PTFE层厚度增大,增大入口区高度有利于提高润滑性能,高度一般控制在0.28~0.32 mm较为合适;随PTFE层厚度增加,最小膜厚增大,功耗减小,但PTFE层厚度过大时,其影响程度减小。There exists the problem of large size,low strength and surface energy of polytetrafluoroethylene(PTFE)metal composite bearing pads,which restricts the formation of lubrication films.In order to improve the lubrication performance of heavy-duty thrust sliding bearing with PTFE-faced pads,the effects of PTFE layer thickness and the shape of lubricating oil inlet wedge area on oil-film formation capacity were studied.Considering the changes of density and viscosity of the lubricating oil along the film thickness,as well as the deformations from the force and the thermal of the double-layer material pads,a 3D lubrication model with thermal-fluid-structure coupling was established by combining film thickness equation,deformation equation,Reynolds equation,and energy equation.The pressure and the temperature of the oil film were numerically simulated,and the effects of some parameters on the minimum film thickness and power consumption were analyzed,including the PTFE layer thickness,the height and the length of the lubricating oil inlet wedge area.The results show that,with the increase of the length of entrance area,the minimum oil film thickness increases,and power consumption decreases.When the length of the inlet wedge area is about 64%of the pad width,the minimum film thickness and the power consumption reach optimal values.As the thickness of PTFE layer increases,increasing the height of entrance area is beneficial for improving lubrication performance,and the height is generally controlled at 0.28 mm to 0.32 mm.With the increase of PTFE layer thickness,the minimum film thickness increases and the power consumption decreases,but when the PTFE layer thickness is too large,the influence degree decreases.

关 键 词：复合瓦推力轴承 聚四氟乙烯 成膜能力 油膜厚度 功耗 

分 类 号：TH117[机械工程—机械设计及理论]