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International Journal of Automotive Technology > Volume 24(1); 2023 > Article
International Journal of Automotive Technology 2023;24(1): 15-22.
doi: https://doi.org/10.1007/s12239-023-0002-0
REDUCTION OF PISTON SKIRT FRICTION USING THE MICRO-SCALE PATTERNED SURFACE
Jongdae Kang , Jonghun Yi , Dong Rip Kim , Sungwook Park
School of Mechanical Engineering, Hanyang University
PDF Links Corresponding Author.  Sungwook Park  , Email. parks@hanyang.ac.kr
ABSTRACT
The purpose of this study is to determine whether piston friction can be reduced by applying a micro-pattern to the skirt portion of the piston, which accounts for the largest proportion of engine parts. The roughness of the ready-made pistons was reduced before etching the micro-scale pattern onto the piston skirt. The micro-patterns were screen-printed on the piston skirt, and kept uniform through etching. The friction reduction effect of the piston was confirmed through an engine experiment using a 1.6 L four-cylinder gasoline engine to remove parts. A hexagonal shape that is representative of bionic textures was selected for the micro-pattern, and circular and cross-hatch patterns were additionally produced for comparison. The friction experiments with the patterning pistons confirmed that friction was reduced by up to 6.74 % by adjusting the spacing of the hexagonal pattern. It was also confirmed that friction was reduced in the cross-hatch pattern by up to 5.28 %. The friction reduction effect may vary depending on the parameters used for a specific pattern.
Key Words: Microscale patterning, Surface structure, Low friction, Engine friction, Piston skirt
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