Patent ID: 8201537

Claim:
A multi-part cooled piston for an internal combustion engine, comprising: an upper piston part having a ring wall with a ring belt; a lower piston part having a box-shaped piston skirt and two pin bosses; wherein the upper piston part together with the lower piston part forms an outer ring-shaped cooling channel and an inner ring-shaped cooling channel disposed concentric to the outer ring-shaped cooling channel, wherein the inner cooling channel is covered by an upper region of the lower piston part, which is configured to have such a thin wall that it can be deformed in the manner of a plate spring, wherein an underside of the upper piston part has a dead-end bore having an inside thread, disposed centered and coaxial to a piston axis, wherein a threaded pin is formed into an upper region of the lower piston part, said threaded pin having an outside thread and being disposed centered and coaxial to the piston axis and directed upward, and wherein the inside thread fits onto the outside thread, so that the upper piston part can be screwed together with the lower piston part by screwing the threaded pin into the dead-end bore.