Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines
Name
lubricants-07-00098.pdf
Size
8.12 MB
Format
Adobe PDF
Checksum (MD5)
7e7c802bbb9d26da1c2a75899e7652b3
Author(s)
Meng, Zhen
Zhang, Linfeng
Tian, Tian
Date Issued
November 2019
Journal
Lubricants
Publisher
MDPI AG
Citation
Meng, Zhen et al. "Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines." Lubricants 7, 11 (November 2019): 98 © 2019 The Authors
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3390/lubricants7110098
