Abstract: A method for producing a piston with a cooling duct for an internal combustion engine, wherein a piston blank is provided with a collar protruding beyond the outer diameter of the later formed piston, and is formed on the piston blank by forging, spin-bending or the like. To form the cooling duct, a radially peripheral recess is introduced into the piston blank by forging, spin-bending or the like. In a further method step, a forming operation is performed on the collar, which together with the peripheral recess forms the cooling duct.

Abstract: A piston includes a piston head, a ring zone and a piston skirt having load-bearing skirt wall sections and rear connecting walls which interconnect the skirt wall sections and piston-pin bosses which run on a boss axis that is set back from a piston axis and penetrate the connecting walls. The peripheral lower edge of the connecting walls is convex in relation to an axis and the upper edge of said connecting walls, preferably below the ring zone, is concave in relation to an axis perpendicular to a piston-pin axis. The piston is equipped with a reinforced section in the vicinity of the piston head running radially behind the ring zone.

Abstract: A piston has a piston head that is provided with a field of rings and a piston shaft which is disposed thereupon. The piston shaft is equipped with supporting shaft wall sections and rear connecting walls which interconnect the shaft wall sections, have an arched shape, and are fitted with a bolt bore. An undercut free space is provided below the annular field in the area of the bolt bore in the region of the piston head. An arched zone is disposed in the interior of the piston at the transition from the bolt bore in the direction of the shaft wall session.

Abstract: A piston for an internal combustion engine has a piston upper part which has a ring field having a plurality of ring grooves, and a piston lower part wherein there is provision for the ring field to have precisely two ring grooves with at least the upper ring grooves having a ring carrier.

Abstract: A piston having a top part and an adjacent shaft part. The top part of the piston is provided with a field of rings encompassing at least one annular groove. A circumferential radial recess is located in the region between the upper edge of the shaft part and the annular groove. The upper diameter of the recess is smaller than the lower diameter of the recess.

Abstract: A piston has a piston head that is provided with a field of rings and a piston shaft which is disposed thereupon. The piston shaft is equipped with supporting shaft wall sections and rear connecting walls which interconnect the shaft wall sections, have an arched shape, and are fitted with a bolt bore. An undercut free space is provided below the annular field in the area of the bolt bore in the region of the piston head. An arched zone is disposed in the interior of the piston at the transition from the bolt bore in the direction of the shaft wall session.

Abstract: The invention relates in particular to a piston (1). Said piston comprises a piston head (3), a ring zone (6) and a piston skirt (2), consisting of load-bearing skirt wall sections (7)and rear connecting walls (5), which interconnect the skirt wall sections (7) and piston-pin bosses (4), which run on a boss axis that is set back from a piston axis and penetrate the connecting walls (5). the peripheral lower edge (8) fo said connecting walls (5) is convex in relation to an axis (10) and the upper edge (9) of said connecting walls, preferably below the ring zone (6), is concave in relation to the axis (10). The piston is equipped with a reinforced section (15) in the vicinity of the piston head (3), said section running radially behind the ring zone (6).