Multiple-piece oil stripping piston ring with reduced friction

US11092238B2 · kind B2 · utility

Assignee

• Federal-Mogul Burscheid GmbH · DE

Inventors

• Stephan Machliner · Leverkusen, DE
• FABIAN RUCH · Leverkusen, DE

Key dates

• Filing date: Nov 28, 2016
• Grant date: Aug 17, 2021
• Expiry date: Jan 4, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J9/22
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A three-piece piston oil control ring 2 has an upper, disc-shaped scraping ring 4, a lower, disc-shaped stabilising ring 6, and a circular expander 8 which has projections 10 protruding in the axial direction on an inner face. The circular expander 8 is arranged between the upper scraping ring 4 and the lower stabilising ring 6, wherein the projections 10 each bear inwardly against an inner face 14 of the scraping ring 4 or against an inner face 16 of the stabilising ring 6. An outer radius 18 of the scraping ring 4 is greater than an outer radius 20 of the lower stabilising ring 6, so that there is a radius difference δ between the scraping ring 4 and the stabilising ring 6.