Abstract: A method for producing a piston for an internal combustion engine, designed as a cooling duct piston for small compression heights. The piston includes a lower part and an upper part which are supported by one or more corresponding joining planes and are connected of a friction welding process. The piston encloses an inner, trough-shaped cooling duct and an outer cooling duct which is axially spaced apart from an annual area. The inner cooling duct is formed in the lower part of the piston by a mechanical machining process, such as a forging process. Transfer openings which are assigned to the cooling ducts are formed before the frictional welding of the joining planes.

Abstract: A cooling channel piston for an internal combustion engine which includes a piston bottom and a piston shaft that are joined thereto of a friction welding process. The piston bottom and the piston shaft jointly form a cooling channel. An annular wall which radially delimits the cooling channel towards the outside is formed by the piston bottom and/or the piston shaft. The annular wall can be sealed by a welding process once the piston bottom and the piston shaft have been joined together.

Abstract: Process for manufacturing a cooling channel piston which has a cooling channel approximately in the area behind the ring belt, where a piston blank is shaped at least partially by forging, where in accordance with the invention it is envisaged that a circumferential shoulder is formed in the area of the heat dam also by forging, a recess is introduced behind the shoulder and the shoulder is subsequently reshaped by deformation in such a way that the recess is closed by the shoulder to form a cooling channel.

Abstract: A method for producing pistons that can be used in internal combustion engines made from lightweight metal, with a combustion bowl assigned to one piston head, wherein a bowl rim is subjected to a melt treatment. In a first method step, the bowl rim is inductively heated. In a second method step, the material of the bowl rim, also to be referred to as the delimiting zone, is improved by means of a laser beam.

Abstract: A piston of an internal combustion engine has a piston crown with annular grooves and a shaft part disposed on the piston crown. The shaft part has bearing shaft wall sections which are connected to one another via inclined connecting walls which are retracted with respect to the outer diameter of the piston. Piston-pin bosses for accommodating a piston pin are disposed in connecting walls. The connecting walls are retracted at such an angle that, in progressing from the lower edge over an intermediate region which lies further back than the lower edge, into an end region which lies further back than the intermediate region the connecting walls to over flush into a hub supporting region below the piston crown.

Abstract: A piston for an internal combustion engine includes a piston head provided with an annular field, and a piston shaft arranged beneath the annular field. The piston shaft has shaft surfaces and a recess surface which is arranged around a bolt borehole and set back in relation to an outer diameter of the piston. At least one cavity is provided in the region of the lowest annular groove for oil flow in the direction of the recess surface during the movement of the piston and the at least one cavity is arranged outside an especially stressed region above the bolt borehole.

Abstract: A piston of an internal combustion engine has a piston crown provided with a ring zone and adjoining a piston skirt encompassing a piston interior, the skirt having two load-bearing skirt wall segments and two pin bosses. Each pin boss encompassing a boss hole is connected to a boss base body by a boss support, the base body having ribs to increase stiffness, which are aligned to the extent possible in the direction of the boss holes continuously connecting the pin bosses. The curved or arched ribs thereby cover a pivoting range of a connecting rod.

Abstract: A method for producing a cast part using a casting machine which comprises a least one casting mould that can be filled with a casting melt. According to the method, the casting is filled with a casting melt, the melt is left to completely solidify and the cast part is then removed from the casting. The casting is filled with melt by the casting machine without the use of pressure at a fill speed of less than 10 m per second in the gating and is then squeezed in the casting mould at a casting pressure greater than 100.

Abstract: A method for producing a piston of an internal combustion engine in which a first blank and at least one additional black are provided with a somewhat cylindrical shape. The blanks are joined together, and the obtained piston blank is subjected to a shaping process in which a combustion chamber cavity of the piston is formed in the area of a joining point between the first and the second blank. The material of the second blank forms a reinforcement for at least the combustion chamber cavity.

Abstract: The invention relates to a process for hardening an annular groove of a piston head (1) of a steel piston of an internal combustion engine by means of laser beams (4), in which, according to the invention, at least the annular groove to be hardened is provided before or directly during hardening with a coating which absorbs the energy of laser beams (4) and the coating is subsequently irradiated with the laser beams (4). The absorbing layer is preferably a manganese phosphate coating or is formed in situ by treating the component surface with a process gas comprising oxygen and inert gas. Furthermore, the laser beams are directed at the piston during hardening at an oblique angle to the direction of rotation. The advantages achieved are: avoidance of reflections and undesirable hardening of the bottom of the rotation. The advantages achieved are: avoidance of reflection and undesirable hardening of the bottom of the groove, an increased degree of absorption and reduced distortion of the piston.

Abstract: A method for producing a one-piece, lightweight piston consisting of steel and having a small compression depth (S) forms piston with at least one cavity in a shaft aperture region. A piston blank is produced in a first step using a forging or casting method. To form a cooling channel between an annular region and a combustion chamber recess an annular section is formed in one piece onto the wall of a cooling channel in the vicinity of the piston base. The joint produced between the annular section and an outer wall of the cooling channel is sealed by welding.

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 coating for a tribologically heavily loaded component, wherein the coating is in the form of a ceramic coating made of an organic-inorganic prepolymer which is pyrolyzed after being applied to the component.

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, such as a cooling channel piston of an internal combustion engine, has a first part, a second part and a third part. The parts can be produced separately from each other and subsequently assembled by way of a joining method. The third part has at least one rotationally symmetrical joining area disposed in direction of the first part, and, another rotationally symmetrical joining area disposed at least in the direction of the second part. The joining areas mate with joining areas of the first part and the second part.

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).

Abstract: A piston, especially a cooling channel piston of an internal combustion engine, has an upper part and a lower part which can be produced separately from each other and subsequently be assembled. The upper part has at least three radially peripheral joining webs and the lower part likewise at least three radially peripheral joining webs. During assembly, the webs are put together and connect the upper part firmly to the lower part.

Abstract: A piston for an internal combustion engine includes a piston head provided with an annular field, and a piston shaft arranged beneath the annular field. The piston shaft has shaft surfaces and a recess surface which is arranged around a bolt borehole and set back in relation to an outer diameter of the piston. At least one cavity is provided in the region of the lowest annular groove for oil flow in the direction of the recess surface during the movement of the piston and the at least one cavity is arranged outside an especially stressed region above the bolt borehole.

Abstract: A coating for a component coming into contact with carbon compounds, wherein the coating consists of a heat-resistant organic-inorganic hybrid polymer.