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.
A Study of Friction Reduction by ‘Soft Skirt’ Piston
Sae Technical Papers
SAE International Powertrains, Fuels and Lubricants Meeting ; 2011
2011-08-30
Conference paper
English
A Study of Friction Reduction by `Soft Skirt' Piston
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