Cooled piston consisting of two parts

US7080610B2 · kind B2 · utility

Assignee

• Mahle GmbH · DE

Inventors

• Valery Bauer · Waiblingen, DE
• Hanspeter Wieland · Ditzingen, DE

Key dates

• Filing date: Apr 17, 2003
• Grant date: Jul 25, 2006
• Expiry date: Apr 17, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02F3/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Cooled two-part piston for internal combustion engines having an upper piston part containing the piston ring grooves and piston pin bosses, and a piston skirt connected with the former exclusively by way of a piston pin. The upper piston part has a cooling oil annular channel that is open towards the piston skirt, into which channel the cooling oil is introduced, and discharged. There are collecting pockets attached at the upper end of the piston skirt, which faces the upper piston part. The pockets at least partially cover the cooling oil annular channel. When the engine and piston are arranged horizontally, a tub-shaped recess is provided in an interior bottom region of the piston skirt for accommodating cooling oil. The circumferential wall limitation of the recess is formed exclusively by a wall of the inside piston skirt.