Patent ID: 6763758
Filing Date: 2004-07-20
Classification: F02F

Abstract:
A multi-part cooled piston for an internal combustion engine, comprising:a piston upper part having a combustion bowl and an annular wall with a piston-ring part; a piston lower part having a box-like piston skirt, bosses to receive piston pins joining the piston to a connecting rod and boss supports, which are joined to the piston skirt; a cooling channel formed by the piston upper part and the piston lower part and being limited thereby in cross section; support elements on the piston upper part and lower part, said support elements having seating faces which form a first and a second seat, wherein the support element comprising the first seat is provided with threads for screwing the piston upper and lower parts together, said threads being configured as a male thread on a circumferential side of an annular rib disposed radially outward relative to a piston diameter and as a female thread on a circumferential side of an annular load-bearing rib disposed radially inward, wherein in a screwed together condition of the piston upper part and piston lower part, the two piston parts are supported exclusively via the first and second seats.