| 主权项 |
1. A piston for an internal combustion engine, comprising:
a piston body forming a crown portion and a skirt portion, the skirt portion including a pin bore that is arranged to receive a pin for connecting the piston to a connecting rod, the skirt portion further forming two guide surfaces along outer margins of the skirt portion, the crown portion forming a generally cylindrical surface surrounding the crown portion, the generally cylindrical surface forming at least two grooves therein that extend parallel to one another, the at least two grooves defining a top land surface, a bottom land surface, and at least one intermediate land surface along the generally cylindrical surface; wherein the top land surface has a height in a direction along a centerline of the piston, wherein the piston has a nominal outer diameter configured to permit the piston to operate within a bore having a nominal inner diameter, and wherein a ratio between the height of the top land surface and the nominal inner diameter of the bore is between 3% and 4.5%; wherein each guide surface extends on an outer portion of the skirt portion over a height in the direction along the centerline of the piston, and wherein the pin bore has a diameter that extends entirely within the respective heights of the two guide surfaces in the direction along the centerline of the piston such that the skirt portion fully supports the piston during operation within a piston bore by counteracting forces and moments present in the piston and applied through the piston bore. |
