Patent ID: 6789460
Filing Date: 2004-09-14
Classification: F02F,F05C

Abstract:
A multipart cooled piston for a combustion engine, comprising:a piston upper part of forged steel comprising a piston crown, a combustion bowl in the piston crown and a ring wall with a ring belt; a piston lower part comprising a box shaped piston skirt, pin bosses for receiving a piston pin connecting the piston to a connecting rod, and pin boss supports connected to the piston skirt, wherein between the piston upper and lower part, an annular recess is arranged; a cooling channel formed in the piston upper part has holes spread over its circumference towards the piston crown, with piston material present between such holes forming supporting ribs that each form sections of an all-round ring rib with a surface radially to a longitudinal piston axis (K), the piston lower part has an annular and all-round carrier rib with a connection surface connected to the pin boss supports, the piston upper part and the piston lower part are non detachably connected by means of connection surfaces of the ring rib and the carrier rib, and the cooling channel is closable by a cooling channel cover.