Piston with oval shaped lands

US5211101A · kind A · utility

Assignee

• Mahle GmbH · DE

Inventors

• Thomas Letsch · Düsseldorf, DE
• Jorn Weipert · Lorch, DE
• Eduart Steppat · Kirchheim unter Teck, DE

Key dates

• Filing date: Jun 20, 1991
• Grant date: May 18, 1993
• Expiry date: Jun 20, 2011

Classification

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

Abstract

A piston for an internal combustion engine with a separate head and skirt which are joined by the piston pin. At least one of the upper lands has a reduced diametrical clearance with the cylinder wall in an area perpendicular to the pin direction. The bottom land has a reduced diametrical clearance with the cylinder wall in the pin direction. The lands are oval shaped, the bottom land optionally a truncated oval. At least one of the upper lands can have the shape of two ovals offset by 90.degree. like a cloverleaf.