Patent ID: 8122935

Claim:
An assembly comprising: a piston including a piston crown and having an axis through the center of the piston and in a longitudinal direction of both the piston and the piston crown; a ring-shaped soluble casting core for forming a cooling channel for accommodating cooling oil in the piston produced using casting technology, close to the piston crown, wherein the casting core has a core bend in the shape of quarter circle and makes a transition into a first region disposed at least approximately parallel to the piston axis and facing away from the piston crown, which region forms a main run-off opening of the cooling channel, wherein the casting core has a second core bend in the shape of a quarter circle and makes a transition into a second region that is disposed approximately parallel to the piston axis and faces away from the piston crown, which region forms the run-in opening of the cooling channel, and wherein the first and the second region of the casting core have at least approximately the same cross-sectional diameter, and are disposed at a distance from one another that corresponds to between once and twice the cross-sectional diameter of one of the two regions.