Abstract: A piston for an internal combustion engine includes a mostly linearly displaceable sleeve for forming at least one piston pin bore and at least one slider that can be displaced at least mostly linearly and diagonally to the sleeve for forming at least one recess under a ring zone of the piston. The sleeve and the slider are at least indirectly coupled, such that the sleeve at least partially carries the slider when displaced. A method for opening and/or closing a casting device for a piston for an internal combustion engine, wherein a mostly linearly displaceable sleeve at least partially carries a slider that can be displaced mostly linearly and diagonally to the sleeve.

Abstract: Piston for use in internal combustion engines, having a piston skirt composed of skirt walls and box walls, said walls enclosing a recess wherein the at least one skirt wall is provided for use on the pressure side of the piston in the installed state. Said piston is in particular characterized in that, in at least one partial region of at least one skirt wall provided for use on the pressure side of the piston, the recess is in substantially the shape of a parabola, a section of an ellipse or a catenoid, wherein said parabola, said section of an ellipse or said catenoid lies in a plane substantially parallel to the piston crown.

Abstract: The invention relates to a method for producing a piston for an internal combustion engine, wherein a section which in the finished piston has a cooling duct (14) and a piston ring groove is recessed at first, the later cooling duct is then covered, and finally material for accommodating the piston ring is applied, and which is characterized in that the later cooling duct is covered by a wire material which is provided in a length, greater than necessary for one single piston. A device for producing a piston for an internal combustion engine with an at first recessed section that in the finished piston has a cooling duct (14) and a piston ring groove, has a device for attaching a cover on the cooling duct and a device for providing wire material having a length greater than necessary for one single piston.

Abstract: In a process for casting a piston for an internal combustion engine, boundary layer solidification in the region of the gudgeon-pin bores (12) is followed by the withdrawal of at least one sleeve provided there and the cooling of the region of at least one gudgeon-pin bore (12). An apparatus for casting pistons for internal combustion engines has at least one sleeve which can be withdrawn from the region of a gudgeon-pin bore (12) and a device for cooling the region of the gudgeon-pin bores (12).

Abstract: In a method for casting a piston for an internal combustion engine, after solidification of the surface layer in the region of the piston-pin bores (12), at least one mandrel provided there is withdrawn and the region of at least one piston-pin bore (12) is cooled by coolant supplied through at least one mandrel. A device for casting pistons for internal combustion engines has at least one mandrel which can be withdrawn from the region of a piston-pin bore (12) and through which a coolant for cooling the region of the piston-pin bores (12) can be supplied.

Abstract: An engine component such as, for example, an engine piston or a part thereof, for instance a ring carrier or piston boss bushing, consisting of a cast iron alloy that contains zirconium as an alloy constituent in an amount by weight of at least 0.01% and up to 0.1%.

Abstract: A cylindrical piston for internal combustion engines, comprising a piston crown and a piston base, in the piston base a hollow space being provided, and in a piston base wall forming the hollow space pinholes being provided, characterized in that the outer circumferential surface in at least the piston base at least one oil guide is provided, the direction thereof having an axial component relative to the piston axis and the oil guide extending from the piston crown in the direction of a pinhole.

Abstract: The invention relates to a cast piston for an internal combustion engine having a piston base, a cylindrical piston head connected to the piston base, and pin bores provided in an at least partially hollow piston shaft, which is positioned on the side of the piston head opposite the piston base. The piston has one or more supporting ribs located at least partially in the piston shaft, and at least one supporting rib has a recess on the side facing the piston base.

Abstract: In a method for producing a piston for an internal combustion engine, at least the region of the upper annular groove is at least partially recessed, an adhesion promoter layer containing aluminum is then applied, a wear-resistant layer is thermally sprayed onto said adhesion promoter layer and at least the upper annular groove is at least partially formed in said layers. The invention also relates to a piston for an internal combustion engine that comprises a base material, an adhesion promoter layer that contains aluminum and is applied to at least some regions of said material and a wear-resistant layer that is thermally sprayed onto said adhesion promoter layer. At least the upper annular groove is at lest partially formed in said layers.

Abstract: The invention relates to a method for producing an internal combustion engine piston which is provided with at least one cooling channel (12) and at least one reinforced piston ring groove (14) consisting in producing a piston blank (1), in forming a groove (10) provided with a cooling channel (12) and an external ring (11) in said piston blank (1), in filling the cooling channel (12) with are movable material (2), in filling the external ring with a reinforcing material (3) in removing the removable material (2) and in finish-machining the piston. A piston made of aluminum alloy and produced according to the inventive method is also disclosed.

Abstract: Disclosed is a piston for a combustion engine, comprising a cooling duct with a single inlet port and at least two outlet ports, at least two of which are separated from each other regarding the discharged coolant. Also disclosed is a combustion engine comprising at least one such piston.

Abstract: A piston for an internal combustion device, has at least one cooling channel, with at least two sections which, when seen from above, are located along the piston axis and/or on different levels in the radial direction, and/or the two or more cooling channels are provided, and at least two of the cooling channels are located on different levels along the piston axis and/or in the radial direction when seen from above, and that at least a supply and/or discharge element extends in an least parallel manner on the piston axis.

Abstract: In a method of producing a piston (10) for an internal combustion engine including at least one strengthened piston ring groove at least one relatively narrow groove (14) is configured in the region of the upper and/or lower flank of the provided piston ring groove (18) and the groove (14) is filled with a hard-wearing material (16) and the piston ring groove (18) is worked out such that the upper and/or lower flank is formed at least in part by the hard-wearing material (16).

Abstract: The invention relates to a liquid-cooled piston (10) for internal combustion engines having a cooling duct (16) that has an annular shape or consists of several annular segments, said duct having a substantially constant cross section along its extension and extending in an undulated manner at least in certain areas in the direction of the axis of the piston (18).