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Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Lubricants 2019, 7(11), 98; https://doi.org/10.3390/lubricants7110098
Received: 17 September 2019 / Revised: 25 October 2019 / Accepted: 29 October 2019 / Published: 2 November 2019
(This article belongs to the Special Issue Tribology of Powertrain Systems)
The piston skirt is one of the main contributors to the total mechanical loss in internal combustion engines. Usually, the skirt friction experiences a rapid change during the break-in period largely due to the wear of the machine marks or roughness against soft coatings. It is thus important to consider the effect of the change of the roughness for a realistic prediction of the piston skirt friction and system optimization. In this work, an existing model of piston skirt lubrication was improved with the consideration of a breaking in process for the most commonly used triangle machine marks. A new set of flow factors in the averaged Reynolds equation were analytically derived for the trapezoid shape formed after wear of the original triangle shape. A new asperity contact model was developed for the trapezoid shape. The calculation results reflect the trend of friction mean effective pressure (FMEP) during break-in in an engine test and showed quantitative agreement under the same amount of wear. View Full-Text
Keywords: piston skirt lubrication; break-in; worn surface; modeling; floating liner engine piston skirt lubrication; break-in; worn surface; modeling; floating liner engine
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MDPI and ACS Style

Meng, Z.; Zhang, L.; Tian, T. Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines. Lubricants 2019, 7, 98.

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