Piston for internal combustion engines

US4075934A · kind A · utility

Assignee

• Karl Schmidt GmbH

Inventors

• Erich Wacker · Heilbronn, DE
• Heinz Hofmann · Neunkirchen, DE
• Karl Kopp · Täby, SE
• Hermann Bauer · Wolnzach, DE
• Volker VON Ey
• Franz Weiss · Dachau, DE

Key dates

• Filing date: Dec 29, 1975
• Grant date: Feb 28, 1978
• Expiry date: Dec 29, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2201/021
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A piston for internal combustion engines, preferably made from aluminum alloy, has machined, oil-dragging grooves formed on the periphery of the piston skirt and concave transitions with a sawtoothlike profile with an obtuse profile angle. The piston skirt is provided with an electrodeposited hard iron layer having a thickness of 1-30 .mu.m and contains 0.5-6% metal-oxy compounds incorporated therein.