| 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 |
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| ABSTRACT |
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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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Corresponding Author.
Sungwook Park , Email. 
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