Federal-mogul Burscheid Gmbh

Stephan Machliner

Fabian Ruch

Dirk Bärenreuter

Nigel Gray

Sina Shahverdi

A multi-piece piston ring includes an upper scraper ringcomprising two flank surfaces, an outer scraping surface/edge, and an inner spring contact surface. A lower support ringincludes two flank surfaces, an outer spring contact surface, and a support ring inner surface. An expander spring/spiral spring, which, on an upper and lower side, is operational to abut against a respective lower flank surface of the upper scraper ringand against the upper flank surface of the support ring. Scraper ring contact projections protruding upwards on an inner spring side, and support ring contact projections protruding downwards on an outer spring side, wherein the scraper ring contact projections are to each abut against the inner spring contact surface of the scraper ring, and support ring contact projections protruding downwards are to abut against the outer spring contact surface.

Multi-piece oil scraper ring with reduced friction

A three-piece piston oil control ringhas an upper, disc-shaped scraping ring, a lower, disc-shaped stabilising ring, and a circular expanderwhich has projectionsprotruding in the axial direction on an inner face. The circular expanderis arranged between the upper scraping ringand the lower stabilising ring, wherein the projectionseach bear inwardly against an inner faceof the scraping ringor against an inner faceof the stabilising ring. An outer radiusof the scraping ringis greater than an outer radiusof the lower stabilising ring, so that there is a radius difference &#x3b4; between the scraping ringand the stabilising ring

Multiple-piece oil stripping piston ring with reduced friction

A piston ring () having increased fatigue resistance includes a plastically deformable material. The piston ring () has a running face (), which is delimited at the top by an upper running face edge () and at the bottom by a lower running face edge (). Compressive stresses are introduced into the upper running face edge () and/or into the lower running face edge () along at least one part of the circumference, the compressive stresses having been produced by roller burnishing.

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Leverkusen, Germany

Stephan Machliner