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: Manufacturing process for a cooling channel piston with formable shoulder 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 light metal piston for internal combustion engines which includes a bearing bushing comprising a shell wrapped from a rolled strip or band shaped metal material. The shell has a butt joint which is closed in a pressed-in state, with a preferred orientation of the metallurgical grain areas being formed in the circumferential direction of the shell.

Abstract: In a piston head of a multiple component piston for internal combustion engines, the piston floor continues radially outwards into the ring section which is provided with the piston ring grooves, the supports which carry the hubs are arranged at a distance from the inner face of the ring section and the piston pin which bears the piston shaft can be mounted in the bores of the piston pin boss. An improved manufacture of the piston head is ensured by connecting the ring section with the piston floor via a weld, solder, friction or positive locking joint.

Abstract: A piston and connecting rod arrangement for internal combustion engines, including an upper piston part, a lower piston part and a connecting rod with a spherical connecting rod end. The spherical connecting rod end defines an upper spherical segment and a lower spherical segment, and a recess having a snoutlike cross section. The spherical connecting rod end is slidingly supported with the upper spherical segment in the spherical segmental indentation, and the recess is situated between the upper spherical segment and the lower spherical segment.

Abstract: In a piston and connecting rod assembly for internal combustion engines, which assembly comprises a spherical small end portion, which is movably mounted in a recess of the piston head and in a retaining ring and which is connected to the skirt of the piston, the load-carrying capacity of the piston, which consists of a pressure-cast aluminum alloy, is increased in that the piston is reinforced by fibers, and a ring carrier which has open pores and is embedded in the ring-carrying portion and is connected thereto by a metallic bond, and a collar serving as an abutment for the retaining ring is integrally cast with the piston skirt on the inside thereof.

Abstract: In a light alloy piston for use in diesel engines for an indirect fuel injection, a body of fibrous material is embedded in the cast piston head and is formed with a shallow combustion recess. In order to improve the conduction of heat outside the portion formed with the combustion recess, the body of fibrous material has a larger height on the side that is formed with the combustion recess than in the remaining portion of the piston head.

Abstract: In a light alloy piston for internal combustion engines the mounting for the piston pin is designed for heavy loads. The piston comprises piston pin bosses which are integrated in the skirt of the piston and provided with an inelastic block support. In order to reduce the weight those end faces of the piston pin bosses which face the small end of the connecting rod are outwardly setback below those segments of the top apex portions of the bosses which include an angle of less than 180 degrees.

Abstract: In a pressure-diecast light-alloy piston for internal combustion engines, which piston comprises shaped fibrous bodies which are partly embedded in at least one of the piston head, ring zone, piston pin bosses and skirt of the piston, which bodies comprise short ceramic fibers, lying in a common plane and in said plane having a random orientation, the improvement wherein the piston (1) is made of a high-temperature magnesium alloy, the piston skirt at least on its sliding surfaces has a chemically applied or electrodeposited metallic sliding layer (3) which has a thickness of about 10 to 30 .mu.m and a hardness of about 740 to 850 HV.sub.0.01, and the inside surface of the piston is coated with a thin plastic paint layer (2) or an anodized magnesium oxide layer.

Abstract: A light-alloy piston for internal combustion engine, is formed in the piston head with a combustion chamber recess. The stresses which are induced at the rim of the combustion chamber recess by the ignition pressure are reduced by the provision of an inwardly extending blind hole in the portions between the ring groove for the lowermost compression ring and the top apex of the bores in the piston pin bosses.

Abstract: A piston rod for pistons of reciprocating piston machines is I-shaped in cross-section. In order to effect a reduction in weight that flange of the piston rod which is nearer to the connecting rod and is enbraced as by claws by the forked and hook-shaped end portion of the connecting rod has a smaller width than the flange which is nearer to the piston head.

Abstract: In a light alloy piston for internal combustion engines, a fibrous insert body is embedded in the cast material adjacent to each of the bosses defining the piston pin bores. In order to minimize the costs of manufacturing such piston, the fibrous body extends only above the horizontal plane which includes the piston pin axis between that plane and the piston head and on both sides of the plane which includes the piston pin axis and the piston axis extends over not more than the load-carrying length of the boss defining the piston pin bore.

Abstract: A piston pin with a bore extending through it. To save weight and to optimize the shape of the pin with respect to accommodating stress, the diameter of the bore is increased to 75 to 90% of the outside diameter of the piston pin and reinforcing ribs are positioned in the bore in the vicinity of the inner edge of each hub.

Abstract: In a piston comprising a top part, which includes at least the piston head and the ring-carrying portion, and a bottom part, which is connected to the top part by suitable means, the adequate lubrication of the piston pin, which is firmly connected to the connecting rod is ensured in that the piston pin is movably mounted in hub segments, which are connected to the bottom part, and in a recess which has the shape of a segment of a cylinder and is formed in a plate that is made of heat-insulating material and inserted on the inside surface of the piston head.

Abstract: Light alloy components for internal combustion engines consist of castings in which reinforcing layers consisting of non-woven ceramic fibers are embedded in the stressed surface portions. In order to provide a prolonged protection against damage to the light alloy disposed under the reinforcing layer, the open interstices of the fibrous layer are impregnated with a layer of a ceramic material in the portion which is close to the stressed surface and with the light alloy of the component in the portion which is remote from the stressed surface.

Abstract: In a piston for internal combustion engines the piston head is formed with a combustion chamber recess and is provided with a heat-insulating layer of ceramic material. To minimize the heat to be dissipated to the coolant, one part of the heat-insulating layer consists of a solid ceramic insert and the other part consists of a ceramic coating.

Abstract: In a piston and connecting rod assembly for reciprocating piston machines the bending load applied to the piston pin bosses owing to the deformation of the piston pin to an oval shape should be prevented and the weight should be reduced. This is accomplished in that the piston pin is I-shaped in cross-section with wide flanges, the outer surfaces of which are shaped in accordance with an arc of a circle.

Abstract: In a piston for internal combustion engines, a cover layer comprising a material having a relatively low thermal conductivity has been applied to the piston head by plasma or flame spraying. To increase the life of the cover layer until it separates from the body of the piston, the surface of the cover layer has a peak-to-valley height of 5 to 30 .mu.m.

Abstract: A cast light metal piston for internal combustion engines is provided with a ceramic insert in those zones which are highly thermally stressed and/or for heat insulation. To form a high-strength bond between the light metal and the insert, high-strength fibers are embedded in the light metal in the zone adjoining the insert.

Abstract: An arc welding process is used for form wear-resistant surfaces at least in the uppermost ring groove of aluminum alloy pistons for internal combustion engines. To reduce the manufacturing costs and to avoid an increase of the weight of the piston, the piston blank is formed by machining with a groove in at least one region to be provided with a ring groove having wear-resistant surfaces. During a rotation of the piston blank about its longitudinal axis said groove is entirely filled by arc welding with a filler material which comprises a silicon-containing aluminum alloy. The molten pool is solidified as quickly as possible by an adequate cooling. The ring groove is subsequently formed by machining.