摘要
针对星形人字齿轮系统,采用热弹流润滑理论和粗糙峰接触计算方法获得不同表面粗糙度下齿面各啮合位置的油膜承载比例及摩擦因数,结合齿面接触载荷和滑移速度计算,分析齿面热流密度分布状态;借助齿轮系统喷油润滑流场仿真得出系统油液分布及齿轮表面传热系数;基于流体动力学仿真和混合弹流润滑分析结果,建立齿轮系统稳态温度场有限元模型,仿真研究各齿轮表面的温度分布规律。结果表明:啮合区中心油膜越厚油膜承载比例越高;综合摩擦因数受几何参数和载荷影响,内、外啮合齿轮副从节点处向齿顶齿根位置摩擦因数呈先增大后减小趋势;太阳轮啮合频次高且散热较慢,温升高于其他齿轮,高温区位于齿顶和齿根,随粗糙度增大太阳轮温度明显升高。
For double helical star gear transmission system,the proportion of load carried by film and the friction coefficient at different meshing positions on tooth surface with different roughness were calculated based on thermoelastohydrodynamic lubrication theory and asperity contacting analysis.In combination with the calculation of contact load and slip velocity,the distribution of heat flux on tooth surface was analyzed.By simulating the flow field of gear transmission system in spray lubrication,the oil distribution and wall heat transfer coefficient of gears’surfaces were determined.Then steady-state thermal finite element model of gear transmission system was built based on the results of flow field simulation and mixed thermoelastohydrodynamic analysis,and temperature distribution of gears’surfaces was analyzed through simulation.Results showed that thicker central oil film got higher proportion of load carried by film.The comprehensive friction coefficient was affected by geometric parameters and load,and increased at first and then decreased from pitch point to addendum and dedendum region for internal and external gears.The sun gear got higher temperature than others with high meshing frequency and poorer heat dissipation,as the high temperature zone was located in addendum and dedendum,and the temperature rose obviously as roughness increased.
作者
林腾蛟
黄河
彭建涛
魏静
LIN Tengjiao;HUANG He;PENG Jiantao;WEI Jing(State Key Laboratory of Mechanical Transmissions,Chongqing University,Chongqing 400044,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2020年第5期1066-1080,共15页
Journal of Aerospace Power
基金
重点研发计划项目(2018YFB2001502)
国家自然科学基金(51875057)。
关键词
齿轮传动涡扇发动机
人字齿轮
混合弹流润滑
热流密度
流体动力学
稳态温度场
geared turbofan engine
double helical gear
mixed elastohydrodynamic lubrication
heat flux
fluid dynamics
steady-state temperature field
