文章摘要
李涵.表面形貌对内燃机主轴承润滑性能的影响[J].润滑与密封,2018,43(6):49-54
表面形貌对内燃机主轴承润滑性能的影响
Influence of Surface Profile on Lubrication Performance of Engine Main bearings
  
DOI:10.3969/j.issn.0254-0150.2018.06.009
中文关键词: 流量因子  表面形貌  内燃机  主轴承  润滑
英文关键词: flow factor  surface profile  internal combustion engine  main bearings  lubrication
基金项目:国家自然科学基金项目 (51275487).
作者单位E-mail
李涵 中北大学机械工程学院 1305658511@qq.com 
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中文摘要:
      基于Patir和Cheng的平均流量方程和流量因子,计入表面形貌和弹性变形等因素,以流体润滑理论为基础,建立内燃机主轴承的润滑分析计算模型;研究主轴颈和轴瓦表面形貌对主轴承最小油膜厚度、最大油膜压力、摩擦损失总功和粗糙接触压力等润滑特性的影响。结果表明,轴颈和轴瓦表面粗糙度值大小和纹理方向对主轴承润滑性能具有显著影响,随着粗糙度值的增加,最小油膜厚度增加,油膜压力减小,粗糙接触压力增加,摩擦损失总功增大;相较横向纹理和各向同性,纵向纹理有利于提高最小油膜厚度,降低粗糙接触压力和摩擦损失总功;当粗糙度值不变时,随着内燃机转速和爆发压力的增加,粗糙接触压力增加,粗糙摩擦损失功率增加,导致磨损加剧效率降低。
英文摘要:
      Based on Patir and Cheng’s average flow equation and flow factor,considered the factors such as surface profile and elastic deformation,the lubrication analysis model of main bearings of engine was established based on the fluid lubrication theory.The influences of the surface profile of journal and bearing bush on the lubrication performances of main bearings were analyzed,including the minimum oil film thickness,the peak oil film pressure,the total friction power loss and peak asperity contact pressure.The results show that the roughness size and roughness texture direction of journal and bearing bush have significant influence on the lubrication performances of main bearings.As the roughness value increases,the minimum oil film thickness is increased,the oil film pressure is decreased,the peak asperity contact pressure and total friction power loss are increased.Compared with transverse texture and isotropy,longitudinal texture is helpful to increase the minimum oil film thickness and reduce the total friction power loss and peak asperity contact pressure.When the value of the roughness is constant,the peak asperity contact pressure and the asperity friction power loss will increased with the increase of internal combustion engine speed and explosion pressure,which will lead to the increase of wear and the decrease of engine efficiency .
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