Patent ID: 9228530
Filing Date: 2016-01-05
CPC Classification: F02F,F16J

Claim Text:
1. A piston for an internal combustion engine, the piston comprising: a crown including a crown surface; a skirt section extending from an outside circumference of the crown; an oil ring groove formed in an outside circumference of the crown; a drain hole extending through a bottom wall of the oil ring groove and connecting the oil ring groove with an inside space of the piston, the drain hole being structurally configured to at least discharge oil away from the crown; and a cooling channel formed, in a shape of a circular ring, in the crown at a position between the crown surface and the oil ring groove, and arranged to convey a cooling oil; the cooling channel including a channel segment located near the drain hole and a main passage segment connected with the channel segment to form a circumferentially extending continuous fluid passage, the channel segment being formed to have a cross sectional shape which is offset from a cross sectional shape of the main passage segment and which is shaped to avoid the drain hole.