Patent ID: 9551291
Date: 2017-01-24
CPC Classifications: F02F,F16J

Claim:
1. A piston, comprising: a crown including a plurality of lands separated by a groove defined between adjacent lands; and a skirt secured to the crown; wherein the plurality of lands includes a first land having a first axial extent, a second land having a second axial extent positioned between the first land and a third land, the third land having a third axial extent, and a fourth land having a fourth axial extent positioned away from a region of combustion in relation to the first and second land, and wherein the fourth land has a greater axial extent than the second land such that an axial guidance surface is predominately provided by the fourth land and the skirt during reciprocating motion in a cylinder or liner; and wherein the fourth axial extent of the fourth land is approximately 2 to 17 percent of a diameter of the piston crown.