Patent ID: 6470792
Filing Date: 2002-10-29
Classification: F16J

Abstract:
A piston for an internal combustion engine comprising(a) a crown; (b) a plurality of axially spaced circumferential piston grooves; and (c) separate piston rings seated in respective said piston grooves; one of the piston rings comprising (1) a first radial flank; (2) a second radial flank; said first radial flank being closer to said crown than said second radial flank; a distance between the first and second flanks determining an axial height of the piston ring; (3) an outer rounded circumferential surface constituting a contact face of the piston ring; said rounded surface having a circumferential crest situated at a distance from said first radial flank; said distance from said first radial flank being more than one half of said axial height; (4) facing end surfaces defining a ring gap; (5) a circumferential groove provided in said outer rounded circumferential surface and extending axially from said second radial flank to said crest; said circumferential groove terminating adjacent each end surface at a distance therefrom; (6) an inner circumferential surface; and (7) a circumferential chamfer provided on said inner circumferential surface; said chamfer extending to said second radial flank.