Abstract: The invention relates to a one-piece piston (1) for an internal combustion engine comprising an annular cooling channel (6) which is arranged in the edge area of the piston head (4) and closed by a substantially cylindrical embodied in one-piece ring (18).

Abstract: A piston for an internal combustion engine has a piston head and a piston skirt spaced apart from the piston head by a ring-shaped recess. The piston has at least one pin bore for accommodating a piston pin. A ring-shaped circumferential cooling channel for a coolant is provided in the piston head, which channel is closed off by a cover ring that consists of at least two segments. At least one region of the cover ring projects at least partially into the clear opening of the at least one pin bore, in such a manner that the cover ring simultaneously forms the retaining element for the piston pin.

Abstract: Disclosed is a piston (1) for a combustion engine, comprising an annular grooved reinforcement (4) that is screwed onto an externally threaded (13) collar (12) located in the piston head area via an internal thread (19) which is mounted on the inside of the grooved reinforcement (4). The grooved reinforcement (4) blocks a recess (14) so as to form an annular, closed cooling duct (21). In order to provide the screwed connection between the collar (12) and the grooved reinforcement (4) with sufficient stability, a radially outward area of the collar (12) is equipped with a bend that points towards the hub. Furthermore, the collar (12) is embodied in an elastically resilient manner so as to bend in the direction of the piston head when the grooved reinforcement is screwed in, thus prestressing the screwed connection.

Abstract: Disclosed is a two-part piston (1) for a combustion engine comprising a combustion chamber (16) in the piston head (13). The piston (1) is composed of a basic member (5) and a top part (6) that is screwed to the basic member (5). In order for the combustion pressure to act substantially upon the basic member (5), which is provided with great mechanical stability and load-bearing capacity relative to the pressure prevailing in the combustion chamber, the bottom part of the combustion chamber (16) is molded into the basic member (5), the top part (6) is configured in an essentially annular manner, and the top part (6) enlarges the combustion chamber (16) at the piston head end while delimiting the same in a radially outward direction similar to a collar (19).

Abstract: Disclosed is a multipart, cooled piston for a combustion engine, comprising, in a radially outward direction, an annular cooling duct located on the bottom side that faces away from the piston head. The cooling duct is closed by a cooling duct cover which is embodied as a ring. The cooling duct cover is provided with a tongue in the radially inner zone. The tongue engages into a recess that is molded into the bottom piston part, thus preventing the cooling duct cover from rotating relative to the piston during assembly as well as during operation.

Abstract: Disclosed is a piston (1) for a combustion engine comprising a closed ring element (6) which is disposed in the radially outer peripheral area of the piston head (5) and is joined to the basic piston member (4) by means of a high-temperature resistant adhesive. The basic member (4) is made of forged aluminum while the ring element (6) is made of Ni-resist. A closed, annular cooling duct (15) that comprises holes for delivering and discharging cooling oil is placed between the basic member (4) and the ring element (6), resulting in a piston (1) that has a simple design, can be produced at low cost, and can be subjected to great thermal loads.

Abstract: The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) provided with a combustion cavity (8), and a lower part (5) that is screwed to the upper part (4) by means of a screw (6) which is arranged coaxially to the piston axis (31). Said screw (6) is embodied as a set screw comprising a hexagon socket (6?) on the inner side of the piston and a head (6?) on the bottom side of the piston, the head (6?) forming part of the bottom of the combustion cavity (8) and being flush therewith (8) in the screwed state.

Abstract: The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) and a lower part (5) that are interconnected by means of an internal hexagon screw (6) consisting of an upper half (37) and lower half (38). The upper half (37) of the internal hexagon screw (6) comprises an external thread (39) which is parallel to the external thread (40) of the lower screw half (38) and has a larger lead angle than the same (40). The lead angle resulting from the difference between the lead angles of the two external threads (39, 40) is very small and contributes to a high strength of the screw connection.

Abstract: The invention relates to a two-piece piston (1) for an internal combustion engine, comprising a piston upper piece (2) and a piston lower piece (2). A cylindrical moulding (24) is arranged on the underside of the piston upper piece (2), facing away from the piston crown, lying coaxial to the piston axis (15), with two radial outward-facing hooked projections (27) on the end thereof facing away from the piston crown. The piston lower piece (6) has an opening (16) on the piston crown side, in which the cylindrical moulding (24) with the projections (27) is introduced and rotated on assembly of the piston upper piece (2) on the piston lower piece (6), such that the projections (27) engage behind the edge of the opening (16).

Abstract: The invention relates to an aluminum piston for a combustion engine having a ring element, which is made of NiResist, is placed in the radially outer edge area of the piston head, and which, together with the base body, forms an annular cooling channel. The ring element is fastened to the base body of the piston via a screwed connection.

Abstract: Proposed is a two-part piston 1 for an internal combustion engine, having an upper part 2 that has a pin 31 having an outside thread 32 on the underside of its piston crown 4, and having a lower part 3, which is connected with the upper part 2 by means of a nut 29 screwed onto the pin 31. The lower part 3 has an elastically resilient upper base part 25, onto which an expansion sleeve 26, elastic in the axial direction, is formed, which has an opening 27 having a collar 28, which is directed radially inward, into which the pin 31 is introduced. An elastic compression sleeve 30 is formed onto the nut 29, which sleeve rests against the collar 28. In this connection, the elastic resilience of the base part 25, the expansion sleeve 26, the compression sleeve 30, the pin 31, and the piston crown 4 has the result that the screw connection has a flat characteristic line despite a low compression height of the piston 1, thereby imparting great strength to the screw connection.

Abstract: The invention relates to a cooling channel covering for a piston of an internal combustion engine in the form of a spring metal sheet which is measured in such a manner that wear and tear in the region of the surface is prevented, in such a manner that a peripheral gap is produced between the radial, external front side of the spring metal sheet and the radial, external limit of the step-shaped recess.

Abstract: Proposed is a two-part piston 1 for an internal combustion engine, having an upper part 2 that has a pin 31 having an outside thread 32 on the underside of its piston crown 4, and having a lower part 3, which is connected with the upper part 2 by means of a nut 29 screwed onto the pin 31. The lower part 3 has an elastically resilient upper base part 25, onto which an expansion sleeve 26, elastic in the axial direction, is formed, which has an opening 27 having a collar 28, which is directed radially inward, into which the pin 31 is introduced. An elastic compression sleeve 30 is formed onto the nut 29, which sleeve rests against the collar 28. In this connection, the elastic resilience of the base part 25, the expansion sleeve 26, the compression sleeve 30, the pin 31, and the piston crown 4 has the result that the screw connection has a flat characteristic line despite a low compression height of the piston 1, thereby imparting great strength to the screw connection.

Abstract: The invention relates to a method for producing a piston (1) for an internal combustion engine. The inventive method comprises producing the base (4) from aluminum by a forging process, casting, by way of a composite casting process, a ring support (10) which is provided with a cooling channel (15) into an aluminum ring element (6), and then welding the ring element (6) with the base (4).

Abstract: The invention relates to a one-piece piston (1) for an internal combustion engine comprising an annular cooling channel (6) which is arranged in the edge area of the piston head (4) and closed by a substantially cylindrical embodied in one-piece ring (18).

Abstract: A piston for an internal combustion engine has a piston head and a piston skirt spaced apart from the piston head by a ring-shaped recess. The piston has at least one pin bore for accommodating a piston pin. A ring-shaped circumferential cooling channel for a coolant is provided in the piston head, which channel is closed off by a cover ring that consists of at least two segments. At least one region of the cover ring projects at least partially into the clear opening of the at least one pin bore, in such a manner that the cover ring simultaneously forms the retaining element for the piston pin.

Abstract: The invention relates to a piston for an internal combustion engine, comprising an essentially cylindrical basis member made of forged aluminum and a ring element that is disposed in the radially outer edge area of the bottom of the piston and forms an annular cooling channel along with the basic member. The ring element is made of cast aluminum and is provided with a ring support for a compression ring, said ring support being made of Ni-resist.

Abstract: The invention relates to an aluminum piston for a combusion engine having a ring element, which is made of NiResist, is placed in the radially outer edge area of the piston head, and which, together with the base body, forms an annular cooling channel. The ring element is fastened to the base body of the piston via a screwed connection.

Abstract: A one-piece piston for an internal combustion engine, having a ring-shaped cooling channel arranged in the outer region of the piston head, is proposed, which is closed off by a ring-shaped cooling channel cover structured towards the side of the pin bosses as a support element. This cooling channel cover comprises at least two arc-shaped cover elements the outer edge of which supports the pin-boss-side face of the ring wall.

Abstract: A method for the production of a one piece piston for an internal combustion engine. The piston has a ring shaped cooling channel arranged in an outer region of a piston head. The channel is partially closed off by a circumferential projection structured as an oil groove. The piston is produced in a simple and inexpensive manner using a piston blank using cutting work such as lathing.