Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines
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 con...
| Main Authors: | , , |
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| Format: | Article |
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MDPI AG
2020
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| Online Access: | https://hdl.handle.net/1721.1/124976 |
| _version_ | 1811074139485634560 |
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| author | Meng, Zhen Zhang, Linfeng Tian, Tian |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Meng, Zhen Zhang, Linfeng Tian, Tian |
| author_sort | Meng, Zhen |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:44:03Z |
| format | Article |
| id | mit-1721.1/124976 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:44:03Z |
| publishDate | 2020 |
| publisher | MDPI AG |
| record_format | dspace |
| spelling | mit-1721.1/1249762022-09-26T13:25:34Z Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines Meng, Zhen Zhang, Linfeng Tian, Tian Massachusetts Institute of Technology. Department of Mechanical Engineering 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. 2020-05-01T17:23:56Z 2020-05-01T17:23:56Z 2019-11 2019-10 Article http://purl.org/eprint/type/JournalArticle 2075-4442 https://hdl.handle.net/1721.1/124976 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 http://dx.doi.org/10.3390/lubricants7110098 Lubricants Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf MDPI AG MDPI |
| spellingShingle | Meng, Zhen Zhang, Linfeng Tian, Tian Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title | Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title_full | Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title_fullStr | Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title_full_unstemmed | Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title_short | Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines |
| title_sort | study of break in process and its effects on piston skirt lubrication in internal combustion engines |
| url | https://hdl.handle.net/1721.1/124976 |
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