Cooling system for I.C.E. valve seat inserts

US4941436A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Michael Beer · Wimsheim, DE
• Philipp Schimko · Besigheim, DE
• August Hofbauer · Pforzheim, DE
• Matthias Kroner · Eisenberg, DE

Key dates

• Filing date: Aug 30, 1989
• Grant date: Jul 17, 1990
• Expiry date: Aug 30, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02F2001/245
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Valve seat inserts of a four-cycle internal-combustion engine are cooled by the lubricating oil of the oil circulating system. An oil duct extending in the camshaft housing is bored in such a manner that the lubricating oil flows from the oil duct into a ring duct surrounding the valve seat inserts. By means of a projection which closes off the ring duct, a forced flow around the valve seat insert is achieved before the lubricating oil flows out of the ring duct through an opening located close to the lubricating oil inlet. From the ring duct the lubricating oil flows through a discharge pipe to the camshaft where it is sprayed on the cams.