Liquid-cooled composite piston for internal combustion engines

US4587932A · kind A · utility

Assignee

• Kolbenschmidt Aktiengesellschaft · DE

Inventor

• Horst Moebus · Neckarsulm, DE

Key dates

• Filing date: Jan 29, 1985
• Grant date: May 13, 1986
• Expiry date: Jan 29, 2005

Classification

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

Abstract

A composite piston for internal combustion engines has an interior cooling chamber and an outer cooling passage. An annular rib protrudes from the inside surface of the upper part and that surface of the lower part which faces that annular rib. An annular flange is clamped between said rib and said surface of the lower part. A tongue which protrudes into the cooling passage is provided on that edge of said flange which faces the cooling passage. In order to minimize the temperature of that surface of the cooling passage which is near the combustion chamber and to maintain at least adjacent to the uppermost ring groove a temperature which is sufficient to prevent a wet corrosion of the piston and of the piston rings, the tongue defines a relatively narrow annular gap with that surface of the cooling passage which is near the combustion chamber so that the coolant oil is throttled as it flows through that gap.