• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (22): 190-200.doi: 10.3901/JME.2020.22.190

• 运载工程 • 上一篇    下一篇

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考虑摩擦副接触应力场和冷却流场的湿式离合器温度场分析

吴邦治1, 秦大同1,2, 胡建军1,2, 刘永刚1,2   

  1. 1. 重庆大学机械传动国家重点实验室 重庆 400044;
    2. 重庆大学汽车工程学院 重庆 400044
  • 收稿日期:2020-01-22 修回日期:2020-09-26 出版日期:2020-11-20 发布日期:2020-12-31
  • 通讯作者: 秦大同(通信作者),男,1956年出生,博士,教授,博士研究生导师。主要研究方向为车辆动力传动与控制。E-mail:dtqin@cqu.edu.cn
  • 作者简介:吴邦治,男,1993年出生,博士研究生。主要研究方向为车辆动力传动与控制。E-mail:bangzhiwu@cqu.edu.cn
  • 基金资助:
    国家自然科学基金(U1764259)、中央高校基础研究(2018CDJDCD0002)和重庆基础研究与前沿探索(cstc2018jcyj AX0409)资助项目。

Analysis of Temperature Field of Wet Clutch Considering Contact Stress Field and Cooling Flow Field of Friction Pair

WU Bangzhi1, QIN Datong1,2, HU Jianjun1,2, LIU Yonggang1,2   

  1. 1. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044;
    2. College of Automotive Engineering, Chongqing University, Chongqing 400044
  • Received:2020-01-22 Revised:2020-09-26 Online:2020-11-20 Published:2020-12-31

摘要: 温度对湿式离合器摩擦副的摩擦特性和热失效具有重要影响。为了获取湿式离合器温度场的分布规律,建立摩擦副接触应力分布有限元模型和摩擦片沟槽内冷却流场数值计算模型,获得了摩擦副接触应力随离合器接合油压的变化规律和冷却流场对流换热随离合器转速的变化规律。在此基础上,提出考虑离合器摩擦副接触应力分布时变特性和冷却流场分布时变特性的离合器温度场数值计算模型。将所建温度场模型的仿真结果与试验结果作对比,验证了所建温度场模型的正确性。通过计算获得了湿式离合器接合过程中不同钢片在半径和厚度方向的温度分布规律,揭示了摩擦副接触应力场和摩擦片沟槽内冷却流场对离合器温度场的影响规律。结果表明,在离合器摩擦副半径方向上,摩擦副的温度分布规律与接触应力分布规律相一致。而摩擦片沟槽内冷却流场的对流换热主要影响离合器同步阶段的温度分布。

关键词: 湿式离合器, 应力场, 冷却流场, 温度场, 数值计算

Abstract: Temperature plays an important role in friction characteristics and thermal failure of wet clutch friction pairs. In order to obtain the distribution of the temperature field of the wet clutch, the finite element model of the contact stress distribution of the friction pair and the numerical calculation model of the cooling flow field in the groove of the friction plate are established. The variation of the contact stress of the friction pair with the clutch engagement oil pressure and the variation of convective heat transfer in the cooling flow field with the clutch speed are obtained. On this basis, a numerical model of clutch temperature field considering the time-varying characteristics of contact stress distribution and cooling flow field distribution is proposed. The simulation results of the temperature field model are compared with the experimental results to verify the correctness of the temperature field model. The temperature distribution of different separator plates in the radius and thickness directions during the wet clutch engagement process is obtained. The influences of the contact stress field of the friction pair and the cooling flow field in the groove of the friction plate on the temperature field of the clutch are revealed. The results show that the temperature distribution is consistent with the contact stress distribution in the radial direction of the clutch friction pair. The convective heat transfer of the cooling flow field in the groove of the friction plate mainly affects the temperature distribution of the clutch locked phase.

Key words: wet clutch, stress field, flow field, temperature field, numerical calculation

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