Piston ring for an internal combustion engine

摘要

A piston ring for sealing a cylinder wall to a piston body is provided. The piston ring includes a ring body of an elastically deformable material which extends substantially circumferentially around an axis and has an inner face that faces the axis. The inner face includes a plurality of axially spaced and radially inwardly extending contact features. The ring body configured to bias the contact features into engagement with the piston body to establish a seal therebetween. At least one of the contact features extends substantially continuously around a circumference for establishing a substantially continuous seal around the piston body, and at least one of the contact features is non-continuous and has at least one recessed area for allowing the passage of oil and gas therethrough.

主权项

1. A piston ring for sealing a cylinder wall to a piston body, comprising:
a ring body having a width extending substantially circumferentially around an axis between opposite ring ends that are spaced from one another by a ring gap when said piston body is in an installed condition, said ring body having a height defined by a distance from a top surface to a bottom surface, said ring body having an inner face facing towards said axis, said inner face including a plurality of axially spaced and radially inwardly extending contact features, said ring body being of an elastically deformable material for biasing said contact features of said inner face into engagement with the piston body, at least one of said radially inwardly extending contact features extending substantially continuously around a circumference for establishing a substantially continuous seal around the piston body, a plurality of said radially inwardly extending contact features being non-continuous and including at least one recessed area for, wherein said recessed areas of said contact features are aligned circumferentially with one another to present a passage for enhanced oil drainage, wherein said passage extends a majority of said height of said ring body, wherein said ring gap when said ring body is in said installed condition has a gap length which is less than said width of said ring body, and wherein each of said recessed areas has a pair of ramping surfaces that are spaced from one another by a non-ramping surface that extends along a predetermined length between said ramping surfaces.