Piston
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United States of America Patent
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Mar 9, 2021
Grant Date -
Apr 23, 2020
app pub date -
Apr 4, 2017
filing date -
Apr 4, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
In a piston of an internal combustion engine in which a recessed portion that holds an intake air swirling flow is formed on a crown surface of the piston, the crown surface includes a heat insulating film formation portion having a heat insulating film whose thermal conductivity is lower than a base material of the piston, the heat insulating film whose thermal capacity per volume is smaller than the base material of the piston, and a heat insulating film non-formation portion provided at a position on the more outside of a cylinder bore side of the internal combustion engine than the heat insulating film formation portion, the heat insulating film non-formation portion not having the heat insulating film.
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