Abstract: A guide blade-adjusting device for a turbocharger has an adjusting ring that is guided in a simple manner on the guide blade carrier plate. The adjusting ring comprises noses projecting in the axial direction. At least one the noses radially guides the adjusting ring on the guide blade carrier plate.

Abstract: A one-piece piston comprises a piston crown made of steel and a bottom component made of forged steel, and a cooling channel that is formed by welding the crown and the bottom component of the piston together. The cooling channel is located radially behind the annular grooves. The crown and the bottom component of the piston jointly form a central cooling chamber whose lower limiting wall is forged as one piece with the bottom component of the piston. The welding seams joining the crown and the bottom component of the piston are friction welding seams. The piston provides for superior cooling of the crown of the piston and simplifies the production of the welding seams.

Abstract: Disclosed is a clamping device for a piston to be mounted, said clamping device being actuated mainly in the direction of pressure/counter-pressure, whereby the whole initial pressure is increased, resulting in greater anti-loosening safety. To that end two screws are placed very close to each other on each side of the piston, one pair being on the pressure side of the piston and the other pair on the counter-pressure side. Both screw pairs have on each side a common pressure member.

Abstract: The invention concerns a built-up piston (1) with an upper part (2) made of an iron material and a lower part (3) made of an aluminum alloy. The object of the invention is to increase the loading capacity of the bosses. To that end, the lower part (3) comprises cast-iron or steel gudgeon pin bosses (4) which are screwed at lest to the lower part (3).

Abstract: The invention relates to a piston with a central cooling chamber. The cooling chamber is located beneath the piston head and is impinged upon by oil. At least the lower wall of the cooling chamber is formed by a plate. The purpose of the invention is to provide a means of fixing the plate to the piston as easily as possible. To this end, the piston has at least one second pin or clamping sleeve situated above the piston pin. The second piston pin or clamping sleeve has a smaller diameter, extends approximately in the direction of the piston pin axis, and is connected to the piston. The plate which forms the lower wall of the cooling chamber is supported against the second piston pin or clamping sleeve.

Abstract: The aim is to improve the strength of an intermetallic bond between engine component made from an aluminium alloy and a reinforcing element made from austenitic cast iron. For that purpose, the reinforcing element is annealed in a decarbonising atmosphere before the known prior art alfin process is carried out, in order to obtain an alfin layer largely free of graphite scales.

Abstract: A cooled ring carrier assembly for the piston of an internal combustion engine, comprising a metal-sheet cooling duct welded to a ring carrier. The cooling duct is press-fit into the inwardly-pointing surfaces of the ring carrier prior to welding. The angle between the inwardly pointing surface of the ring carrier, to which surface metal-sheet cooling duct is welded, and the metal-sheet cooling duct is smaller than 45.degree.. This allows the cooling duct to be press fit into the ring carrier rather than being shrunk in by temperature differences between the ring carrier and cooling duct.

Abstract: In a piston-cylinder assembly with a shaftless piston, the aim is to improve the lateral guidance of the connecting rod, to reduce edge wear and the seizing tendency in the event of fault during the combustion process. Consequently, the piston has at least one supporting ring, form-fittingly on the bosses which guides in the cylinder the piston along with the piston head.

Abstract: In a reinforcing component made from austenitic iron which is bonded intermetallically with an engine component made from an aluminium-base alloy, in particular a piston, the aim is to improve the strength of the bond irrespective of the graphite configuration in the base material. For that purpose, the structure at least on areas of the reinforcing component surface in the vicinity of the intermetallic bond is austenitic-ledeburitic.

Abstract: A mushroom-type pin retainer for a pin having a central bore and which connects a piston and a piston rod of an internal combustion engine. The pin retainer is comprised of a mushroom head connected to a shaft. The shaft has a section of larger diameter for insertion into the bore of the pin. This section is no longer than 2 mm in an axial direction and is located remote from the mushroom head, so that the pin retainer may swing by a limited angle during mounting in the bore. This configuration makes the assembly simple to mount, even if it is manufactured by an imprecise manufacturing process such as injection molding.

Abstract: A piston with a cooling channel having a basic piston barrel made from forged steel and a box-shaped shaft, bosses and boss supports and connecting walls between the boss supports as well as a combustion trough. The piston increases the rigidity of the ring part. To accomplish this, the piston has a wall extending all around above the boss bores. A structural component is welded in between the wall and the piston head and limits the cooling channel. This design increases the rigidity of the ring part in pistons.

Abstract: A cast light metal piston of box-type construction for a two-stroke engine, comprising a piston blank having a gudgeon pin boss molded on a bottom section of the piston blank and a piston shaft having an open end and being connected to the gudgeon pin boss via approximately straight wall sections. There is only one lug disposed on only one side of the piston shaft. The wall section connecting the piston shaft with the gudgeon pin boss near the lug has a window-like recess. The wall section connecting the piston shaft with the gudgeon pin boss remote from the lug is closed and is raised upwardly with respect to the length of the shaft beginning from the open end of the shaft.

Abstract: A light-metal piston has a sheet-metal cooling channel integrally cast in the piston head. In order to improve the heat transfer between the piston material and the cooling channel and to reduce the manufacturing costs of the cooling channel, the channel has a narrow slit, which allows oil to pass, extending along at least part of the channel wall.

Abstract: The cylinder running surfaces of an internal combustion engine are treated with pretreatment and coating baths by using flush-in devices (5, 11) with lances insertable into the cylinder bores (1'). The flush-in devices (5, 11) can be successively connected via manifold devices (10, 12) with reservoirs (V.sub.1 to V.sub.5 ; B.sub.1 to B.sub.3) for different bath liquors. Thus, each flush-in device (5, 11) serves for the successive introduction of different bath liquors into the cylinder bores (1').

Abstract: A precision drill for drilling noncircular bores, comprising a drill bit on a shaft and a holder for the workpiece being drilled, for providing a drill that can operate economically at high speeds. The workpiece holder oscillates translationally in at least one direction at a frequency controlled by the speed of the drill bit, and moves along a path determined by the desired shape of the bore to be drilled.

Abstract: The invention concerns a method of producing a one-part piston which, in the region of the piston ring zone, has a closed cooling duct and a recess between the piston ring zone and the box-shaped piston body. The method comprises the following steps: a piston blank is produced by a forging process; the annular recess is produced by machining, the axial height of the recess corresponding at least to the axial height of the cooling duct; the cooling duct, which is open at the bottom, is produced by machining; hub bores are formed and the outer contour of the piston is finished; and the cooling duct, which is open at the bottom, is closed by a two-part cover ring.

Abstract: In a light-metal piston for highly stressed internal combustion engines with a combustion chamber in the piston head, in order to keep the stresses at the edge of the combustion chamber low without unnecessarily increasing the stresses in the support and the gudgeon pin boss, the following features are provided in combination: the combustion chamber in the piston head is not reinforced; the drilling of gudgeon pin boss is widened (crowned) at and towards its inner end at least in a partial region X of its entire length; the drilling in each gudgeon pin boss is a shaped drilling widening conically from the outside at least in a partial region Z; the drilling of each gudgeon pin boss has two oblique wells running from its inner end.

Abstract: An internal combustion engine with at least one cooling oil injector arranged in the motor housing, and at least one reciprocating piston made of light metal. The piston head has a combustion space depression and a closed, ring-shaped cooling oil channel arranged thereon. The channel has an inlet opening and at least one outlet opening. A cooling oil injector rigidly joined with the engine housing injects a free jet of oil aligned slanted relative to the axis of the piston. The ring-shaped cooling oil channel is partly filled with cooling oil in the motor operation. The inlet opening has an edge stretched out long in the circumferential direction of the piston, which ends funnel-like in the zone of the inside wall of the piston skirt. The piston can accommodate high stresses since the length of the inlet opening disposed in the circumferential direction of the ring-shaped cooling oil channel is slightly shorter than the length required to directly collect the oil jet in all piston positions.

Abstract: In order to improve the guidance of a light-metal piston for an internal combustion engine of a motor vehicle by obtaining a uniform behavior under different stresses of the pressure and/or counter pressure side of the piston skirt, the wall thickness of the piston skirt is made different in the region of its pressure and/or counterpressure regions from that in its other regions. In the pressure and counterpressure regions, there is a thickening on the inner side of the piston skirt which is gradually reduced from the lower edge of the skirt in a central plane in the piston length and pressure/counterpressure direction back to the normal thickness.

Abstract: In a piston-cylinder assembly with a shaftless piston, the aim is to improve the lateral guidance of the connecting rod, to reduce edge wear and the seizing tendency in the event of fault during the combustion process. Consequently, the piston has at least one supporting ring, form-fittingly on the bosses which guides in the cylinder the piston along with the piston head.