Patent ID: 6729291
Filing Date: 2004-05-04
Classification: F02F

Abstract:
A multipart, cooled piston for an internal combustion engine, comprising:an upper part having a ring part and a ring wall; a lower part, which jointly with the upper part forms an outer ring-shaped cooling channel and an inner ring-shaped cooling channel arranged concentrically with the outer cooling channel, said lower part comprising a box-shaped piston shaft with two bolt hubs connected therewith; a threaded bolt arranged coaxially with a longitudinal axis of the piston and disposed on a side of the upper part facing the lower part, wherein the threaded bolt forms an inner limitation of the inner cooling channel; and a threaded bore arranged coaxially with the longitudinal axis of the piston and disposed on an area of the lower part that covers the inner cooling channel and which faces the upper part, said area being thin-walled to such an extent that it can be deformed like a plate spring, and said threaded bore having a female thread fitting the thread of the threaded bolt, wherein the threaded bolt and the threaded bore are arranged so that the threaded bolt is screwed into the threaded bore for assembling the upper part and the lower part.