Abstract: The aim of the invention is to produce a light-alloy bearing bush with a rough external surface. To achieve this, particles, which are subsequently surrounded in part by the molten metal, are applied to the surface of the casting mould. When the bearing bush is released from the mould, the particles remain in said bush and are subsequently removed from the bearing bush preform either mechanically or by being dissolved in liquid.

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.

Abstract: A piston for an internal combustion engine which comprises a piston body, and a ring element, which together form a basic piston body. When the ring element is screwed onto the piston body, it forms a ring shaped cooling channel which is closed off in a direction of the pin bosses by a projection of the basic body. The projection is structured in the form of an elastically resilient cup spring which is deformed when the ring element is screwed onto the body. This deformation and counter stress, contributes to the strength of the screw connection.

Abstract: A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft, wherein the piston shaft is connected with the piston hubs suspended on the piston crown. In such a piston, an easy to assemble cooling channel cover is achieved in that a one-piece, plastic spring steal ring, U-shaped in cross-section, having radially angled outer and inner shanks around the circumference, has at least one film hinge running around the circumference of the ring. The film hinge allows at least one radial deflection of at least one of the shanks, in such a manner that in order to close off the cooling channel, the shanks engage in a stepped conical recess on the inner edge of the cooling channel.

Abstract: A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft. The piston shaft is connected with the piston hubs suspended on the piston crown. In such a piston, an easy to assemble cooling channel cover is achieved by a one-piece plastic/spring steel ring that is U-shaped in cross-section, having a ring bottom and an outer shank around the circumference, molded onto the ring bottom and angled off radially to the outside, and an inner shank around the circumference, angled off radially to the inside.

Abstract: In a cooling channel piston for a diesel engine with direct injection, a reduction in the compression height is achieved while keeping the output the same or increasing it. The piston consists of at least two parts soldered to one another, one of which is a piston base body forged from steel, having a shaft, hubs, and a ring part, and second part of which, consisting of steel or a nickel-based material, comprises a combustion trough and at least a part of the piston head. The piston base body and the second part together from a cooling channel that can be filled with oil.

Abstract: A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft, wherein the piston shaft is connected with the piston hubs suspended on the piston crown. In such a piston, an easy to assemble cooling channel cover is achieved by means of a one-piece plastic/spring steel ring that is U-shaped in cross-section.

Abstract: The invention relates to a piston for a diesel engine comprising a combustion cavity. The piston crown and the cavity are plasma-sprayed with a coating. The aim of the invention is to produce the coating in a cost-effective manner. To achieve this, the layer thickness of the coating is uneven, being thicker in the border region of the cavity.

Abstract: To provide the pistons of internal combustion engines with profiled ring grooves in a simple manner. To this end, the profile is produced by laser beams.

Abstract: To prevent, in a cooled ring carrier (1) for pistons, durinh Alfin bonding, the formation of oxides induced by air that escapes due to porous ring carrier material and, as a consequence, an impairment of the ring carrier bond. To this end, the cooled ring carrier, once the ring carrier part and the sheet metal part (3) have been linked, is subjected to negative pressure in a vacuum tank.

Abstract: The invention relates to a built-up piston, comprising central screwing and a central cooling chamber. The aim of the invention is to reduce the flow resistance in the oil delivery area. To this end, means for transferring oil from the piston rod to the central cooling chamber are provided in the area of the screw head of the central screw connection.

Abstract: A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown and a ring-shaped recess between the piston ring band and the piston shaft. There is an easy to assemble cooling channel cover comprising a one-piece plastic/spring steel ring that is U-shaped in cross-section, having a ring bottom and an outer shank around the circumference, molded onto the ring bottom and angled off radially to the outside, and an inner shank around the circumference, angled off radially to the inside. There is a fist radial division having a mouth width (M) and a second radial division forming a first film hinge for radial deflection of one of the ring shanks and a second film hinge that permits at least one radial deflection of at least one of the radially angled shanks. In order to close off the cooling channel, the shanks engage in a stepped conical recess of on an inner circumferential edge of the cooling channel.

Abstract: A method for the production of pistons having depression edge armoring for internal combustion engines, in which a more heat-resistant armoring ring, in comparison with a forged piston blank having a combustion depression, is connected with the piston blank in the region of the depression edge.

Abstract: A method for the production of a forged piston for an internal combustion engine, having a combustion depression provided on the piston head. The piston is formed from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters. The two unmachined parts are formed to produce a piston blank, by means of forging, causing the combustion depression to be formed from oxidation-resistant steel. The piston blank is subsequently finished via machining to produce a piston ready for installation in the internal combustion engine.

Abstract: A method for the production of a forged piston for an internal combustion engine, having a combustion depression provided on the piston head. The piston is formed from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters (d), in each instance. The two unmachined parts are formed to produce a piston blank by means of forging, causing the combustion depression to be formed from oxidation-resistant steel. Subsequently the piston blank is finished via machining to produce a piston ready for installation in the internal combustion engine.

Abstract: A method for the production of a forged piston for an internal combustion engine, having a combustion depression provided on the piston head. The piston is formed from a first tube-shaped unmachined part made of oxidation-resistant steel, having at least one join surface, and a second cylindrical unmachined part made of hot-forgeable steel, having at least one join surface. The join surface of the first unmachined part is shrunk onto the join surface of the second unmachined part. The two unmachined parts are formed to produce a piston blank, by means of forging, causing at least the combustion depression to be formed from oxidation-resistant steel. Subsequently the piston blank is finished via machining to produce a piston ready for installation in the internal combustion engine. Simplified and cost-effective production of a piston having a reduced tendency to oxidize at the edge of the depression, and improved protection against wear caused by erosion is achieved.

Abstract: A multipart cooled piston for a combustion engine has a piston upper part of steel comprising a combustion bowl and a ring wall with ring belt, and a piston lower part comprising a piston skirt, pin bosses for receiving the piston pin connecting the piston to the connecting rod, and pin boss supports connected to the piston skirt. An inexpensive manufacture and high form stability are achieved in that a cooling channel formed in the piston upper part has holes towards the piston crown spread over its circumference, with the piston material present between such holes forming supporting ribs that each form sections of an all-round ring rib radially to the longitudinal piston axis (K), The piston lower part has an annular and all-round carrier rib with a connection surface connected to the pin boss supports.

Abstract: A method for drilling shaker bores into a cooling channel of a single-part piston, in which gudgeon-pin bosses each having a gudgeon-pin bore and piston shaft elements are molded onto the piston head via a tie-up substantially extending fully around in the form of a ring. Passage bores are drilled into the tie-up coaxially with the shaker bores to be drilled into the cooling channel, and the shaker bore is drilled into the underside of the piston head with a drilling bit inserted in the respective passage bore.

Abstract: A method for drilling shaker bores into a cooling channel of a single-part piston, in which gudgeon-pin bosses each having a gudgeon-pin bore and piston shaft elements are molded onto the piston head via a tie-up substantially extending fully around in the form of a ring. Passage bores are drilled into the tie-up coaxially with the shaker bores to be drilled into the cooling channel, and the shaker bore is drilled into the underside of the piston head with a drilling bit inserted in the respective passage bore.

Abstract: A multi-part cooled piston for an internal combustion engine comprises a one-piece piston upper part having a combustion bowl and an annular wall with a piston-ring part, and a one-piece piston lower part having a box-like piston skirt, and bosses to receive the piston pins joining the piston to the connecting rod and boss supports, which are joined to the piston skirt. A cooling channel is formed through the piston upper part and also the piston lower part and is limited thereby in its cross section. A reduction of the compression height and an increase of the heat load can be achieved with this piston despite increasing engine power. The piston can also be assembled without microstructural change. The piston upper part and the piston lower part are provided with support elements having seating faces, which form a first and a second seat.