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

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

南京农业大学工学院，南京　210031

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
计量
- 文章访问数: 233
- HTML全文浏览量: 68
- PDF下载量: 19
- 被引次数: 0
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

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

College of Engineering, Nanjing Agricultural University, Nanjing 210031, China

摘要

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。
- HMCVT箱体 /
- 刚柔耦合虚拟样机模型 /
- 动态激励 /
- 线性累积损伤 /
- 疲劳寿命
Abstract: In order to solve the fatigue failure problem of the hydro-mechanical continuously variable transmission(HMCVT) boxof the heavy tractor due to the complex load in the actual process, a fatigue life prediction method for HMCVT box based on the virtual prototype technology was proposed. A rigid-flexible coupling virtual prototype model for HMCVT box was established based on Adams. Besides, the dynamic excitation of each bearing hole of gearbox shell under different working conditions was acquired. S - N curves of HMCVT boxwere re-fitted under the consideration of load characteristics, structure parameters, and surface technology. Finally, the prediction offatigue life of the HMCVT boxwas conducted based on the Miner linear accumulative damage theory. The results indicated that the S - N curve of the structure has a certaindegreeof modification comparing with the traditional material. The dangerous point of the shell was located at the bore of the idler axle under the dynamic excitation, while the fatigue cumulative damage (D) was 4.8353×10⁻⁸, and the life of the HMCVT box is 57447 hours. So, the structure design of the box was conservative and satisfied the requirement of service time.
- HMCVT box /
- rigid-flexible coupling virtual prototype model /
- dynamic excitation /
- fatigue Life /
- linear accumulative damage theory

HTML全文

图 1 液压机械无级变速器传动原理图

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图 2 变速器虚拟样机仿真模型

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图 3 试验设备及测点

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图 4 拖拉机轮心路面激励

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图 5 输出轴左轴承孔动态载荷

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图 6 HMCVT箱体有限元模型

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图 7 HMCVT箱体有限元分析结果

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图 8 应力积分路径及分布

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图 9 原材料与修正后结构的S - N曲线

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图 10 危险点应力历程雨流直方图

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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	3 969	148
犁耕工况	20 844	775

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表 2 各轴承孔载荷最大值

轴承孔		X方向/N		Y方向/N		Z方向/N
轴承孔		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	左	13 780	5 140	11 759	−6 354	9 668	6 086
Ⅰ 轴	右	−3 573	−1 551	15 673	−4 639	−8 529	−4 761
Ⅱ 轴	左	3 206	−4 266	−5 576	−3 984	3 489	2 155
Ⅱ 轴	右	−23 829	−19 880	12 230	7 467	8 338	7 052
Ⅲ 轴	左	6 055	7 493	6 155	3 933	4 125	1 600
Ⅲ 轴	右	14 454	9 207	24 956	12 907	−5 102	−3 713
Ⅳ 轴	左	−53 329	−26 677	−56 354	−54 011	−22 179	−6 800
Ⅳ 轴	右	56 036	40 632	−51 837	32 138	−30 831	13 520
Ⅴ 轴	左	−28 459	−15 682	9 473	3 878	17 571	9 380
Ⅴ 轴	右	−56 835	−35 001	50 595	22 756	−26 239	−20 311
Ⅵ 轴	左	−30 638	30 180	−45 253	36 446	14 858	10 601
Ⅵ 轴	右	45 376	−1 551	15 673	−4 639	−8 529	−4 761

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