Split ceramic piston ring arrangement with nested biasing ring

US4966068A · kind A · utility

Assignee

• Ficht GmbH · DE

Inventors

• Reinhold Ficht · Kirchseeon, DE
• Lutz Hamann · Neubrandenburg, DE

Key dates

• Filing date: Mar 28, 1989
• Grant date: Oct 30, 1990
• Expiry date: Mar 28, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2201/0448
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A piston-ring arrangement for use in an internal combustion engine including a cylinder with a piston axially displaceable within the cylinder and at least one piston ring guided in the cylinder. The cylinder, piston and piston-ring are made of a ceramic material. The piston ring is formed of two circumferentially extending parts and is mounted in a groove in the circumferentially surface of the piston. The groove has a depth greater than the corresponding radial depth of the piston ring so that a spring element can be positioned between the base of the groove and the piston ring for biasing the piston ring radially outwardly. The spring element can be annular member with a corrugated shape or a multi-part ceramic member shaped to provide a biasing action.