Piston for internal combustion engines
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United States of America Patent
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Nov 28, 2017
Issued Date -
N/A
app pub date -
May 24, 2016
filing date -
May 25, 2015
priority date (Note) -
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Abstract
A resin coat film 39 formed on a skirt portion 10 of a piston 7 has a four-sided outer peripheral region knurled at upper and lower regions thereof corresponding in a rear view of the piston 7 to an upper skirt part 36 and a lower skirt part 38 of the skirt portion 10 extending in parallel with an axial direction of left and right piston pin boss portions 15 and 14, with a combination of short vertical grooves 43A and 43B and medium-length vertical grooves 42A and 42B extending in parallel with a central axis C of a piston crow portion 9, and at left and right edge regions thereof, with long vertical grooves 41.
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