PISTON ASSEMBLY HAVING A PASSAGE EXTENDING TO THE SECOND RING GROOVE

摘要

A piston assembly configured to reciprocate within a cylinder of an internal combustion engine is disclosed. The piston assembly comprises a top surface, a cylindrical wall, a first ring, a second ring, and at least one passage. The cylindrical wall extends from the top surface and includes a first ring groove, a second ring groove, and a first land between the first ring groove and the second ring groove. The first ring is received within the first ring groove. The second ring is received within the second ring groove. The second ring includes an outer surface configured to engage the cylinder and an inner surface opposite the outer surface. The at least one passage fluidly couples a first volume to which the outer surface is exposed to a second volume to which the inner surface is exposed.