Patent ID: 7080610

Claim:
Cooled two-part piston for internal combustion engines, comprising: an upper piston part containing piston ring grooves and piston pin bosses, and a piston skirt connected with the upper piston part exclusively by way of a piston pin in an articulated manner, wherein the upper piston part is provided with a cooling oil annular channel that is open towards the piston skirt, radially within a piston ring groove region, into which channel the cooling oil is introduced and discharged, and wherein collecting pockets are attached at an upper end of the piston skirt facing the upper piston part, said pockets at least partially covering the cooling oil annular channel; and wherein when the internal combustion engine and the piston are arranged horizontally, a tub-shaped recess is provided in inside bottom region of the piston skirt for accommodating cooling oil, and wherein the tub-shaped recess has a circumferential wall limitation formed exclusively by a wall of the inside piston skirt.