高能密度摩擦片接合过程传热特性分析  

Analysis of the Thermal Field of Friction Disc with High Energy Density

作　　者：赵海鸣[1] 曹飞[1] 夏毅敏[1] 洪余久[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《机械科学与技术》2014年第3期339-343,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：湖南省科技计划项目(2010GK3074);中南大学研究生学位论文创新项目(1102)资助

摘　　要：以某型湿式多片离合器为例,研究高能密度摩擦片的温度场,以探求其温度变化规律。建立了高能密度摩擦片数值模型,讨论空气和润滑油的对流换热,运用有限元法对接合过程温度场进行计算,讨论各向异性导热率、转速差、接合时间对温度场的影响。结果表明:最高温度值出现在接合面中径的外侧,各向异性导热率主要影响摩擦片接合面的温度场;高转速差会使接合面上产生高温,当转速超过4 000 r/min,接合时间小于0.8 s时,会出现400℃以上的高温烧蚀;缩短接合时间会加快接合后期温度下降的速度。In order to discuss the temperature feature of disc, the temperature under high investigated based on the multi-plate wet clutch. The convective effects of cooling oil and heat conduction theory and numerical model for heat transfer in the emergency braking energy density condition is air are analyzed based on is established. The transi- ent temperature distribution in the engagement process is simulated via FEM, Then the influencing factors on the tem- perature field are discussed by investigating the parameters of anisotropic thermal conductivity, relative rotary speed, engaging time. The present results show that the highest temperature of engagement face of disc appears in the outside of pitch diameter; anisotropic thermal conductivity primarily affects the temperature of the engagement face of disc rather than the location far away from it; higher relative rotary speed results in higher temperature on engagement face, at the speed difference reaches 4 000 r/min or above and the engaging time is less than 0.8 s, the max tempera- ture will exceed 400 ℃ so as to cause high temperature ablation. Under the same rotary speed difference, to decrease in the engaging time will accelerate the temperature drop at its later engagement stage.

关 键 词：高能密度摩擦片 数值模型 有限元 温度场 

分 类 号：U463.211[机械工程—车辆工程]