摘要
文章建立了内燃机活塞裙部混合润滑数学模型,建模时综合考虑了活塞裙部外形轮廓、表面波度和粗糙度、活塞裙部和缸套的热变形和弹性变形以及裙部润滑摩擦状况等因素,分析了工作状态下热、弹性变形对活塞二阶运动轨迹、最小油膜厚度以及摩擦力的影响。结果表明相对于冷态,工作状态下活塞二阶运动幅度和摩擦力有所减少,而最小油膜厚度则有所增加。该模型可对活塞-缸套系统各种设计参数进行分析比较,为活塞-缸套系统优化设计提供指导。
A mathematical model for piston skirts in mixed lubrication is developed in this paper.The model takes into account the factors that affect the lubrication characteristics of piston skirt,such as the topography of piston skirt surface waviness and roughness,thermal and elastic deformations of piston skirt and cylinder bore,and the lubrication and friction of piston skirt.The effects of thermal and elastic deformations on entire piston secondary motion trajectory,minimum film thickness,and total friction forces are calculated under working condition.It is shown that under working condition,the displacement of the piston secondary motion and total friction forces are smaller and the minimum film thickness is larger than in cold state.All the design parameters of piston-cylinder system can be compared and analyzed by using the model,and the results are useful for the optimal design of piston-cylinder system.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期801-804,816,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家高技术研究发展计划(863计划)资助项目(2007AA04Z119)
关键词
活塞
热变形
弹性变形
二阶运动
piston
thermal deformation
elastic deformation
secondary motion
