• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (10): 222-234.doi: 10.3901/JME.2022.10.222

• 运载工程 • 上一篇    下一篇

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润滑机制下基于最小作用量原理的CVT传动安全裕度优化研究

韩玲, 赵伟, 曹越, 王金武   

  1. 长春工业大学机电工程学院 长春 130012
  • 收稿日期:2021-12-05 修回日期:2022-02-05 出版日期:2022-05-20 发布日期:2022-07-07
  • 通讯作者: 王金武(通信作者),男,1981年出生,博士,讲师。主要研究方向为板材冲压成形缺陷控制理论与应用研究。E-mail:wangjinwu@ccut.edu.cn
  • 作者简介:韩玲,女,1984年出生,博士,副教授。主要研究方向为变速机构传动理论与控制研究。E-mail:hanling@ccut.edu.cn;赵伟,男,1997年出生,硕士研究生。主要研究方向为变速机构传动及控制。E-mail:zw656488556@126.com;曹越,女,1990年出生,硕士,讲师。主要研究方向为汽车理论与控制、汽车造型设计。E-mail:caoyue@ccut.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51905044)。

Research on Safety Margin Optimization of CVT Transmission Based on Principle of Least Action under Lubrication Mechanism

HAN Ling, ZHAO Wei, CAO Yue, WANG Jinwu   

  1. School of Mechatronic Engineering, Changchun University of Technology, Changchun 130012
  • Received:2021-12-05 Revised:2022-02-05 Online:2022-05-20 Published:2022-07-07

摘要: 针对现有金属带式无级变速器(Continuously variable transmission, CVT)滑摩传动过程中润滑机制影响金属带传递安全性与效率的问题。以某国产自主研发CVT为研究对象,对CVT从动带轮与金属带摩擦片之间作用力和应力分布趋势的分析,建立金属带轮运动下的热弹流润滑模型。由于CVT运行过程中油膜状态在多变约束空间下具有临界极值的特性,提出润滑特性符合最小作用量原理的假设,构建符合最小作用量原理的CVT润滑特性Lagrange函数及最小作用量原理模型,推导出CVT润滑过程中实际作用量和理论最小作用量的数值,厘清变温环境下膜厚作用量的变化趋势,验证假设的合理性。求得金属带轮与摩擦片间宏观摩擦因数与微观油膜剪切力的函数表达式,结合CVT传动综合试验,分别测试摩擦因数、温度、传动效率与转矩比的工作关系,计算金属带最佳传递转矩数值。将运行特定工况参数范围得到的结果进行插值处理,确定CVT滑摩传动安全裕度,分析变速机构不同速比、输入转矩与转速在确定安全裕度下传动效率的变化特性。结果表明,基于最小作用量原理优化下的CVT传动效率可有效提升2.62%~3.76%。为解决CVT传递安全性及效率问题提供了一种新的优化思路。

关键词: 无级变速器, 最小作用量原理, 油膜特性, 安全裕度, 传动效率

Abstract: Aiming at the problem that the lubrication mechanism of the existing metal belt type continuously variable transmission (continuously variable transmission, CVT) sliding friction transmission process affects the safety and efficiency of metal belt transmission. Taking a domestically-developed CVT as the research object, the distribution trend of force and stress between CVT driven pulley and metal belt friction plate was analyzed, and the thermal elastohydrodynamic lubrication model of metal belt pulley was established. Due to the critical extreme value of oil film state in the process of CVT operation, the assumption that the lubrication characteristics conform to the principle of least action is put forward. The Lagrange function and principle of least action model of CVT lubrication characteristics are constructed, and the values of actual action and theoretical minimum action in CVT lubrication process are deduced, and the film under variable temperature environment is clarified The change trend of thick action amount verifies the rationality of the hypothesis. The function expressions of macro friction coefficient and micro oil film shear force between metal belt pulley and metal friction plate are obtained. Combined with CVT transmission comprehensive test, the working relations of friction coefficient, temperature, transmission efficiency and torque ratio are tested respectively, and the optimal transmission torque value of metal belt is calculated. The safety margin of CVT sliding friction transmission is determined by interpolating the results obtained from specific operating conditions. The variation characteristics of transmission efficiency under different speed ratios, input torque and speed of the transmission mechanism are analyzed. The results show that the transmission efficiency of CVT can be effectively increased by 2.62%-3.76% based on the principle of least action. It provides a new optimization idea to solve the problem of CVT transmission safety and efficiency.

Key words: continuously variable transmission, principle of least action, oil film characteristics, safety margin, transmission efficiency

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