Combined compression and oil scraper piston ring
AssigneeFederal-Mogul Burscheid GmbH
InventorHans-Albert Michel
Life of this patent
Estimating the term…
Abstract
A piston ring includes a first radial flank; a second radial flank; and an outer rounded circumferential surface constituting a contact face of the piston ring. The rounded face has a circumferential crest line situated at a distance from the first radial flank which is more than one half of the axial piston ring height. The piston ring further has facing end surfaces defining a ring gap; and a circumferential groove provided in the outer rounded circumferential surface and extending axially from the second radial flank to the crest. The circumferential groove terminates adjacent each end surface at a distance therefrom.
Claims3
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.
Dependencies are inferred from the claim text.