Mixed Thermo-Elastohydrodynamic Lubrication of Connecting Rod Big End Bearing Considering Cavitation and Micro-Elastohydrodynamic Conditions

Abstract

Abstract:

Abstract： Based on multi-body dynamics, the lubrication calculation model was built for connecting rod big end bearing with consideration of mixed thermoelastohydrodynamic, cavitation and micro-elastohydrodynamic conditions. The method to find cavitation erosion region was proposed, the lubrication state was analyzed, and the heat dissipation of frictional power loss was calculated. The results show that the bearing is in a mixed lubrication state, the asperity contact takes place at both edges of upper bearing top; the cavitation erosion position is recognized by the axis orbit, the lube oil fill ratio, the fill ratio rate of change and the hydrodynamic pressure rate of change; the mean frictional power is 0.44 kW; the maximum transient asperity frictional power is only 111.1 mW, and the monitoring of transient frictional power will not accurately recognize the local lubrication state; and the heat conduction is the main way of energy dissipation in big end bearing lubrication.
Key words：

Key words: connecting rod big end bearing, microelastohydrodynamic, mixed lubrication, cavitation effect

CLC Number:

TK 421

LIU Xiaori，LI Guoxiang，HU Yuping，BAI Shuzhan. Mixed Thermo-Elastohydrodynamic Lubrication of Connecting Rod Big End Bearing Considering Cavitation and Micro-Elastohydrodynamic Conditions[J]. Journal of Shanghai Jiaotong University, 2015, 49(05): 626-632.

References

［1］Bukovnik S, Offner G, Caika V, et al. Thermoelastohydrodynamic lubrication model for journal bearing including shear ratedependent viscosity［J］. Lubrication Science, 2007, 19(4): 231245.

［2］Allmaier H，Priestner C，Reich F M，et al. Predicting friction reliably and accurately in journal bearingsExtending the EHD simulation model to TEHD［J］.Tribology International, 2013, 58: 2028.

［3］Elbutch A. Transient thermo elasto hydrodynamic lubrication of connecting rod bigend bearings［C］∥ 2002 World Congress of the Society of Automotive Engineers.USA: SAE Paper, 2002, 2002011731.

［4］Katagiri T, Hanahashi M, Okamoto Y. Parametric study for design factors on engine bearings by using TEHL analysis［C］∥ 2002 World Congress of the Society of Automotive Engineers. USA: SAE Paper, 2002, 2002010298.

［5］Sun J, Cai X X, Liu L P. Research on the effect of whole cylinder block on EHL performance of main bearings considering crankshaft deformation for internal combustion engine［J］. Journal of Tribology, 2010, 132(4):044502044508.

［6］刘利平, 孙军, 桂长林, 等. 内燃机工况对连杆轴承润滑性能的影响［J］. 轴承, 2010(5): 3033.

LIU Liping, SUN Jun, GUI Changlin, et al. Effect of operating conditons on lubrication performance of connecting rod bearings for internal combustion engine［J］. Bearings, 2010(5): 3033.

［7］陈礼焕, 杨陈, 沈源, 等. 增压直喷汽油机连杆大头轴承润滑特性研究［J］. 拖拉机与农用运输车, 2013, 40(5): 2629.

CHEN Lihuan, YANG Chen, SHEN Yuan, et al. ［J］. Tractor and Farm Transporter, 2013, 40(5): 2629.

［8］朱小平, 刘震涛, 张鹏伟, 等. 基于AVLEXICTE的内燃机连杆轴承润滑仿真分析［J］. 机电工程, 2012, 29(2): 142145.

ZHU Xiaoping, LIU Zhentao, ZHANG Pengwei, et al. Lubricating simulation analysis of connecting rod bearing based on AVLEXCITE［J］. Journal of Mechanical and Electrical Engineering, 2012, 29(2): 142145.

［9］Sloetjes J W. Microelastohydrodynamic lubrication in concentrated sliding contacts［D］. Netherlands, Enschede: University of Twente, 2006.

［10］温诗铸, 黄平. 摩擦学原理［M］. 3版. 北京: 清华大学出版社, 2008: 511.

［11］Jakobsson B, Floberg L. The finite journal bearing considering vaporization［J］. Transactions of Chalmers University of Technology Gothenburg, 1957, 190: 1116.

［12］Olsson K O. Cavitation in dynamically loaded bearing［J］. Transactions of Chalmers University of Technology, 1965, 308: 160.

［13］王刚志, 郝延明, 马维忍, 等. 内燃机主轴承热弹性流体动力润滑研究［J］. 内燃机工程, 2010, 31(5): 6368.

WANG Gangzhi, HAO Yanming, MA Weiren, et al. Thermoelastohydrodynamic lubrication research of main bearing in IC engines［J］. Chinese Internal Combustion Engine Engineering, 2010, 31(5): 6368.

［14］Greenwood J A, Tripp J H. The contact of nominally flat rough surface［J］. Proceedings of the Institution of Mechanical Engineers, 1970, 185(1): 625633.

［15］朱龙英, 李贵三. 机械设计［M］. 北京: 高等教育出版社, 2012: 237.

[1]	LI Rui,MENG Xianghui. Analysis of Factors Affecting Tribo-Dynamics of Guide Shoe of Marine Diesel Engine [J]. Journal of Shanghai Jiaotong University, 2020, 54(10): 1035-1044.
[2]	NING Lipu1,NING Xin2,MENG Xianghui3. Piston Skirt Mixed Lubrication Analysis Considering the Effects of Lubricant Shear-Thinning [J]. Journal of Shanghai Jiaotong University, 2018, 52(5): 511-517.
[3]	LIU Jun,ZHANG Zhinan,XIE Youbai. Effect of Low Viscosity Oil and Surface Texture on Friction Characteristics of Piston Ring-Liner [J]. Journal of Shanghai Jiaotong University, 2018, 52(5): 505-510.
[4]	WANG Zhijian,CHEN Xiaoyang,SHEN Xuejin. A Mixed EHL Model of Finite-Length Line Contact Considering Asperity Elasto-Plastic Deformation and the Lubricant Properties [J]. Journal of Shanghai Jiaotong University, 2018, 52(5): 525-532.
[5]	CHEN Shi1,ZHANG Zhinan1,CAI Xiaojiang2,WEI Xinsheng2. Influence of Grinding Parameters on Workpiece Surface Morphology and Friction Performance [J]. Journal of Shanghai Jiaotong University, 2018, 52(5): 575-581.