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悬链线型线轴瓦对连杆大头轴承润滑特性的影响

李程坤 贾德文 邓伟 李伟 徐加恒 冀会平

李程坤,贾德文,邓伟, 等. 悬链线型线轴瓦对连杆大头轴承润滑特性的影响[J]. 机械科学与技术,2022,41(12):1815-1821 doi: 10.13433/j.cnki.1003-8728.20200542
引用本文: 李程坤,贾德文,邓伟, 等. 悬链线型线轴瓦对连杆大头轴承润滑特性的影响[J]. 机械科学与技术,2022,41(12):1815-1821 doi: 10.13433/j.cnki.1003-8728.20200542
LI Chengkun, JIA Dewen, DENG Wei, LI Wei, XU Jiaheng, JI Huiping. Influence of Catenary Profile on Lubrication Characteristics of Conrod Big-end Bearing[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(12): 1815-1821. doi: 10.13433/j.cnki.1003-8728.20200542
Citation: LI Chengkun, JIA Dewen, DENG Wei, LI Wei, XU Jiaheng, JI Huiping. Influence of Catenary Profile on Lubrication Characteristics of Conrod Big-end Bearing[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(12): 1815-1821. doi: 10.13433/j.cnki.1003-8728.20200542

悬链线型线轴瓦对连杆大头轴承润滑特性的影响

doi: 10.13433/j.cnki.1003-8728.20200542
基金项目: 云南省科技厅重大科技计划项目(2018ZE001)
详细信息
    作者简介:

    李程坤(1995−),硕士研究生,研究方向为内燃机设计与结构优化,1417507244@ qq. com

    通讯作者:

    邓伟,教授,硕士生导师,1323364897@qq.com

  • 中图分类号: TK422

Influence of Catenary Profile on Lubrication Characteristics of Conrod Big-end Bearing

  • 摘要: 针对柴油机连杆大头轴承润滑不良和摩擦磨损的问题,结合轴承型线的设计理论,建立了悬链型线的数学表达式。运用AVL POWER UNIT搭建连杆柔性多体动力学模型,研究了连杆大头轴承的悬链线型线对其润滑特性的影响。结果表明:当连杆大头轴承采用悬链线型线轴瓦时,随着型线径向变化量的逐步增加,峰值油膜压力先减小后增大,最小油膜厚度先增大后减小,总摩擦功耗先减小后增大。当采用径向变化量为方案4(变化量6 μm)的悬链线型线轴瓦时,最小油膜厚度增加了0.22 μm,峰值油膜压力减少了10.92 MPa,总摩擦功耗减少了0.28 kW,有利于减小轴承的摩擦磨损功耗和改善连杆大头轴承的总体润滑性能。通过曲线拟合分析得到了最小油膜厚度、峰值油膜压力和总摩擦功耗这3个评价参数的函数关系,为连杆大头轴承润滑特性的优化设计提供参考依据。
  • 图  1  连杆大头轴承剖面对比示意图

    图  2  平衡活塞机构示意图

    图  3  缸内压力曲线

    图  4  连杆组柔性多体动力学模

    图  5  工作连杆轴瓦缩减模型

    图  6  连杆悬链线型线轴瓦放大图(1 000×)

    图  7  最小油膜厚度变化曲线

    图  8  峰值油膜压力变化曲线

    图  9  总摩擦功耗变化曲线

    图  10  不同评价指标的函数拟合图

    表  1  不同径向变化量对应变参

    径向变化量y/μm轴承宽度x/mm悬链型线变参a
    2±12.539062.50
    4±12.519531.25
    6±12.513020.83
    8±12.59765.63
    10±12.57812.50
    下载: 导出CSV

    表  2  连杆大头轴承结构参数与工作参数

    参数数值
    轴承宽度/mm 25
    轴承孔径/mm 56
    轴承半径间隙/mm 0.03
    润滑油类型 5W-30
    供油压力/bar 4
    穴蚀压力/bar 0.98
    环境压力/bar 1
    轴颈表面粗糙度/μm 0.4
    轴瓦表面粗糙度/μm 0.8
    下载: 导出CSV

    表  3  不同径向变化量轴承润滑参数对比

    方案径向变化
    量/μm
    最小油膜
    厚度/μm
    峰值油膜
    压力/MPa
    总摩擦
    功耗/kW
    101.25222.191.14
    221.32218.841.01
    341.39215.770.91
    461.47211.270.86
    581.18227.191.23
    6101.12233.491.29
    下载: 导出CSV

    表  4  不同函数的系数取值表

    系数f1xf2xf3x
    a01.28222.41.08
    a1−9.53×10−24.500.13
    b11.23×10−1−8.74−0.17
    a25.09×10−2−3.44−0.05
    b2−4.69×10−40.04−4.93×10−3
    a3−1.59×10−20.280.02
    b39.61×10−3−0.79−4.90×10−3
    a41.80×10−2−1.02−1.74×10−2
    b44.12×10−30.39−1.42×10−2
    w5.14×10−10.490.53
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-01-11
  • 网络出版日期:  2023-02-16
  • 刊出日期:  2022-12-05

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