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重型拖拉机液压机械无级变速器箱体疲劳寿命分析

孙晓旭 鲁植雄 陈元

孙晓旭,鲁植雄,陈元. 重型拖拉机液压机械无级变速器箱体疲劳寿命分析[J]. 机械科学与技术,2022,41(12):1844-1851 doi: 10.13433/j.cnki.1003-8728.20200548
引用本文: 孙晓旭,鲁植雄,陈元. 重型拖拉机液压机械无级变速器箱体疲劳寿命分析[J]. 机械科学与技术,2022,41(12):1844-1851 doi: 10.13433/j.cnki.1003-8728.20200548
SUN Xiaoxu, LU Zhixiong, CHEN Yuan. Fatigue Life Analysis of Hydro-mechanical Continuously Variable Transmission Box of Heavy Tractor[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(12): 1844-1851. doi: 10.13433/j.cnki.1003-8728.20200548
Citation: SUN Xiaoxu, LU Zhixiong, CHEN Yuan. Fatigue Life Analysis of Hydro-mechanical Continuously Variable Transmission Box of Heavy Tractor[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(12): 1844-1851. doi: 10.13433/j.cnki.1003-8728.20200548

重型拖拉机液压机械无级变速器箱体疲劳寿命分析

doi: 10.13433/j.cnki.1003-8728.20200548
基金项目: 国家重点研发专项(2016YFD0701103)
详细信息
    作者简介:

    孙晓旭(1995−),硕士研究生,研究方向为结构设计与优化,sxx18705190738@163.com

    通讯作者:

    鲁植雄,教授,博士生导师,博士,luzx@njau.edu.cn

  • 中图分类号: TH132

Fatigue Life Analysis of Hydro-mechanical Continuously Variable Transmission Box of Heavy Tractor

  • 摘要: 针对重型拖拉机液压机械无级变速器(简称HMCVT)实际作业过程中由于箱体受载复杂,载荷不对称从而易发生疲劳破坏的问题。本文提出了一种基于虚拟样机技术修正材料S-N曲线对HMVCT箱体进行疲劳寿命预测的方法。利用Adams建立变速器刚柔耦合虚拟样机模型,提取HMCVT箱体各轴承孔处的动态激励。综合考虑HMCVT箱体载荷特点,结构参数,表面工艺等因素,重新拟合了箱体结构S - N曲线,根据Miner线性累计损伤理论对HMCVT箱体进行疲劳寿命预测。结果表明,结构S - N曲线较传统材料S - N曲线有较大程度的修正,HMCVT箱体危险点疲劳累计损伤量为D = 4.8353×10−8,变速箱寿命为57447 h,满足全寿命使用要求。该研究为设计及优化农机装备关键零部件时的疲劳寿命预测提供了参考。
  • 图  1  液压机械无级变速器传动原理图

    图  2  变速器虚拟样机仿真模型

    图  3  试验设备及测点

    图  4  拖拉机轮心路面激励

    图  5  输出轴左轴承孔动态载荷

    图  6  HMCVT箱体有限元模型

    图  7  HMCVT箱体有限元分析结果

    图  8  应力积分路径及分布

    图  9  原材料与修正后结构的S - N曲线

    图  10  危险点应力历程雨流直方图

    表  1  变速器扭矩负载

    拖拉机作业方式路面负载/Nm变速箱输出轴扭矩/Nm
    运输工况3 969148
    犁耕工况20 844775
    下载: 导出CSV

    表  2  各轴承孔载荷最大值

    轴承孔X方向/NY方向/NZ方向/N
    犁耕工况运输工况犁耕工况运输工况犁耕工况运输工况
    Ⅰ 轴 13 780 5 140 11 759 −6 354 9 668 6 086
    −3 573 −1 551 15 673 −4 639 −8 529 −4 761
    Ⅱ 轴 3 206 −4 266 −5 576 −3 984 3 489 2 155
    −23 829 −19 880 12 230 7 467 8 338 7 052
    Ⅲ 轴 6 055 7 493 6 155 3 933 4 125 1 600
    14 454 9 207 24 956 12 907 −5 102 −3 713
    Ⅳ 轴 −53 329 −26 677 −56 354 −54 011 −22 179 −6 800
    56 036 40 632 −51 837 32 138 −30 831 13 520
    Ⅴ 轴 −28 459 −15 682 9 473 3 878 17 571 9 380
    −56 835 −35 001 50 595 22 756 −26 239 −20 311
    Ⅵ 轴 −30 638 30 180 −45 253 36 446 14 858 10 601
    45 376 −1 551 15 673 −4 639 −8 529 −4 761
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-01-21
  • 网络出版日期:  2023-02-16
  • 刊出日期:  2022-12-05

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