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Effect of Design and Operational Parameters of Piston Skirt on the Performance and Efficiency of a Small Gasoline Engine
Technical Paper
2014-01-2016
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Piston is a very important part of the engine as the contribution to its efficiency and performance is huge. This study is to understand in detail, the effect of piston skirt design on the functioning of an engine. A small gasoline engine was taken up for study. A commercially available numerical code PISDYN was used to analyze the piston liner interface. The Finite Element (FE) models of piston and the liner were used to simulate Elasto-Hydrodynamic Lubrication (EHL) between skirt / liner and piston pin / pin hole. Friction of the numerical model was validated through a tear-down motoring of the engine.
The secondary motion of the piston is studied. Understanding of how the profile and the ovality of the piston skirt affects the friction, wear and impact force at the piston liner interface is gathered. Asymmetrical skirt profile is proposed and its utility to reduce the thrust force on the liner and hence its friction and vibration of the engine is explained. The importance of piston-liner cold clearance, viscosity and liner surface roughness on skirt lubrication, friction and wear is understood. Also how piston pin offset and piston mass affects the thrust forces is seen. Based on the above understandings, conditions which would aid engine seizure and how it can be avoided are explained.
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Citation
J, A. and Agarwal, V., "Effect of Design and Operational Parameters of Piston Skirt on the Performance and Efficiency of a Small Gasoline Engine," SAE Technical Paper 2014-01-2016, 2014, https://doi.org/10.4271/2014-01-2016.Also In
References
- Moughon Luke Effects of piston design and lubricant selection on reciprocating engine friction Master's thesis Massachusetts Institute of Technology June 2006
- Agarwal , V. and J , A. Optimization of Piston and Ringpack Design to Improve the Performance and Emission Characteristics of a Gasoline Engine SAE Technical Paper 2013-01-2809 2013
- Duyar , M. , Bell , D. , and Perchanok , M. A Comprehensive Piston Skirt Lubrication Model Using a Mass Conserving EHL Algorithm SAE Technical Paper 2005-01-1640 2005 10.4271/2005-01-1640
- Wong , V. , Tian , T. , Lang , H. , Ryan , J. et al. A Numerical Model of Piston Secondary Motion and Piston Slap in Partially Flooded Elastohydrodynamic Skirt Lubrication SAE Technical Paper 940696 1994 10.4271/940696
- Shah Paras B An efficient piston design methodology including secondary dynamics and Elasto hydrodynamic lubrication Phd thesis Oakland University 2008
- Keribar , R. and Dursunkaya , Z. A Comprehensive Model of Piston Skirt Lubrication SAE Technical Paper 920483 1992 10.4271/920483
- PISDYN Documentation/User Manual Version 2013.3
- Stanley , R. , Taraza , D. , Henein , N. , and Bryzik , W. A Simplified Friction Model of the Piston Ring Assembly SAE Technical Paper 1999-01-0974 1999 10.4271/1999-01-0974
- Goenka , P. and Meernik , P. Lubrication Analysis of Piston Skirts SAE Technical Paper 920490 1992 10.4271/920490