A Study of Friction Reduction by ‘Soft Skirt’ Piston

To reduce friction is required to improve engine fuel economy. This study aimed to reduce piston skirt friction, which is a major factor in engine friction. ‘Soft skirt’ is a trendy item in recent gasoline engines, which can improve skirt sliding condition by larger deformation when the piston is pr...

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Bibliographic Details
Main Authors: Hoshikawa, Jun, Kato, Kiminari, Miyamoto, Kazushi, Higashi, Hirofumi, Ito, Akemi
Format: Report
Language:English
Online Access:Request full text
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Summary:To reduce friction is required to improve engine fuel economy. This study aimed to reduce piston skirt friction, which is a major factor in engine friction. ‘Soft skirt’ is a trendy item in recent gasoline engines, which can improve skirt sliding condition by larger deformation when the piston is pressed to the liner. The effect is confirmed by friction measurement and oil film observation, using prototype pistons. And also one major factor of the effect is clarified that not only side force but also cylinder pressure causes effective deformation of the skirt to create thick oil film at early combustion stroke.
ISSN:0148-7191
2688-3627
DOI:10.4271/2011-01-2120