Abstract: A sintered connecting rod for an internal combustion engine comprises a connecting rod eye (1) for receiving a piston pin, a connecting rod big end (3) for holding the crank pin and a shaft (2) made of two diverging longitudinal bridges (4) which are optionally stiffened by a connecting bridge (5) and whose mutually facing bridge flanks (11) are connected in the zone of the connecting rod big end (3) by a central concave rounding (9). In order to ensure advantageous loading conditions it is proposed that the longitudinal bridges (4) of the shaft (2) diverge from the connecting rod big end (3) to the connecting rod eye (1).

Abstract: A chain wheel is described with a wheel body consisting of a wheel rim and a wheel hub which wheel body carries a transmitter ring with radially projecting shoulders for detecting various angles of rotation or ranges of angles of rotation. In order to provide advantageous constructional conditions, it is proposed that the transmitter ring provided with inwardly projecting shoulders can be inserted into the wheel rim and can be attached to supports which are distributed over the inner circumference of the wheel rim and can be attached to supports which are distributed over the inner circumference of the wheel rim and form an axial support for the transmitter ring.

Abstract: A process for powder metallurgic manufacture of a coupling body (1) with a crown (2) of coupling teeth (3) is described, whose flanks (5) going out from wedge-shaped end faces (4) are in relief, such that a formed body with coupling teeth (3), which have wedge-shaped end faces (4), but flanks (5) parallel to axis, is pressed out of a sintering powder and sintered to a molded blank, whose coupling teeth (3) for forming the flank reliefs are subjected to axial compression molding between two form tools (9, 10) on the one hand for the wedge-shaped end faces (4) and on the other hand for the flank reliefs.

Abstract: Described is a molded part made of light metal, in particular a crankcase for an internal combustion engine, comprising holes (5) for receiving fastening screws (6) with the help of which compressive strains can be exerted on the molded body in a light metal area. In order to create advantageous constructional conditions, it is proposed that at least one open-pored sintered body (7) is cast in the light metal area exposed to compressive strains with infiltration of the light metal at least in the pores of a surface layer; and that the sintered body (7) having a lower coefficient of thermal expansion than the light metal has a strength at least corresponding with the strength of the light area when combined with the infiltrated light metal.

Abstract: There are described a method and an apparatus for producing a gear wheel from a powder metal blank (1) pressed and sintered with an overmeasure in the toothing area, which powder metal blank is compacted under a plastic deformation in the vicinity of the overmeasure by pressing against a counter-toothing (8) of at least one rotating pressing tool (3) by the overmeasure, which counter-toothing engages in the toothing (9) of the powder metal blank (1). To create advantageous constructional conditions it is proposed that the counter-toothing (8) designed as internal toothing of the annular pressing tool (3) enclosing the powder metal blank (1) is pressed into the toothing (9) of the powder metal blank (1) by means of a pressure roller rolling on the outside periphery (10) of the pressing tool (3).

Abstract: The description relates to a crankcase made of light metal for an internal combustion engine with a parting plane (4) running through the crankshaft axis between a case upper part and a case bottom part, whose bearing walls (2), which connect the case outer walls (1), are provided with inserts (3) made of an iron material, in which the bearing shells of the crankshaft bearing and the bearing bolts (7) provided on both sides of the bearing shells are borne. To achieve favorable construction features it is suggested that the bearing walls (2) forming a continuous light metal bridge between the case outer walls (1) accommodate the inserts (3) that are lower than the bearing walls (2) in recesses (8) starting from the parting plane (4) and are provided, in the area of the bearing bolts (7), with through holes (9) for the bolt heads (10).

Abstract: A method of producing a sintered body (1) having different cross-sections along a main axis (5), in particular a toothed-belt or chain wheel, by compression moulding a sintering powder in the direction of the main axis (5) and subsequent sintering. At least two partial bodies (6, 7), which can be form-fitted into each other in the direction of the main axis (5), are pressed from sintering powder, which partial bodies each form an axial portion of the sintered body (1) with different cross-sections, and that the separately pressed and possibly presintered partial bodies (6, 7) are jointly sintered after joining them together.

Abstract: A method of producing a sliding sleeve for a synchronizer of a speed-changing gear, the sliding sleeve being comprised of a sintered powder metal compact having a claw extending along an inner periphery of the sleeve, and the claw consisting of teeth having opposite end faces and a cross-section between the end faces which is reduced relative to an undercut portion at at least one of the end faces, which method comprises the steps of sintering the powder metal compact having the claw consisting of the teeth having the opposite end faces and the reduced cross-section extending between the end faces, and then applying solely an axial upsetting force to the one end face to form the undercut portion thereat while leaving the reduced cross-section unchanged.

Abstract: There is described a method of producing a cam for a jointed camshaft by sintering a compact made from a sintering powder, which is calibrated after sintering and then subjected to quenching and tempering. To avoid extensive rework, it is suggested that the compact be pressed, sintered and calibrated corresponding to a desired contour (4), which differs from the desired contour (1) of the cam contrary to the distortion (3) produced during quenching and tempering, and that the calibrated compact is then given the desired contour (1) of the cam due to the distortion (3) produced during quenching and tempering.

Abstract: A process is described which serves to assemble a synchronizer for a gear change box, which synchronizer comprises a hub provided with a slidable sleeve and at least one cone coupling comprising a double-conical ring, which is freely rotatable relative to the hub and is adapted to be non-positively gripped between an inner friction ring, which is connected to the hub, and a synchronizing outer ring, which is axially displaceable relative to the friction ring by the slidable sleeve, wherein the clutch in an engaged position is moved to engage the synchronizing outer ring with a locating abutment to ensure an axial lost motion between the synchronizing ring and the hub, and the friction ring is subsequently axially fixed to the hub and thereafter the locating abutment is removed.

Abstract: An apparatus is described for machining a conical ring, particularly a friction ring, which has inside and outside conical machinable surfaces having parallel radially aligned generatrices, which apparatus comprises two coaxial machining tools which consist of an outer tool having an inside conical machining surface for machining the outside machinable surface of said ring and an inner tool having an outside conical machining surface for machining said inside machinable surface of said ring, which machining tools are mounted to be rotatable about a common axis relative to said ring and said ring is adapted to be held between said tools so as to be centered on said axis.

Abstract: A process is described for manufacturing a friction ring for use in a clutch or brake. The friction ring comprises a friction lining provided on at least one peripheral surface of a conical or cylindrical carrying ring, which has been formed from a flat sheet metal blank after coating comprising a power mixture has been formed on the flat sheet metal blank. The process comprises providing a flat sheet metal blank, admixing a curable synthetic resin binder to the powder mixture to provide a binder-containing mixture, applying the binder-containing mixture to the blank to form a coating thereon, partly setting the coating, subsequently shaping the blank with the coating to form the carrying ring, and curing the coating on the carrying ring to form the friction lining.

Abstract: A sintered electrode having fine pores and coarse pores and intended for use in a voltaic cell is made from reduced iron powder granules, which have been made from an iron(III) oxide powder having a particle size up to 10 micrometers and have a particle size not in excess of 500 micrometers and are compacted to form an electrode body, which is sintered under a reducing atmosphere at a sintering temperature up to 750.degree. C. The iron powder granules are derived from the agglomerated iron powder that is formed as the iron powder is reduced at 600.degree. to 800.degree. C. and optionally after the agglomerated iron powder has been reduced in size, and the iron powder granules before being compacted are mixed with an organic solid expanding agent, which volatilizes during the sintering process and is used in such a proportion and has such a particle size that the resulting sintered electrode has coarse pores in the desired number and the desired size.

Abstract: A process is described for manufacturing a friction ring for use in a clutch or brake. Said friction ring comprises a sintered friction lining that is provided on at least one peripheral surface of a conical or cylindrical carrying ring, which has been formed from a flat sheet metal blank after a coating comprising a sinterable powder mixture has been formed on the flat sheet metal blank. In order to permit a shaping of the sheet metal blank independently of the ductility of the sintered friction lining, it is proposed that the sinterable powder mixture for making the friction lining is mixed with an expellable synthetic resin binder before said mixture is applied to the flat sheet metal blank to form said coating, said coating is set, the sheet metal blank provided with said coating is shaped to form the friction ring when said coating has been set, and the friction lining is subsequently sintered while or after the synthetic resin binder is expelled at least in part.

Abstract: To make a sintered member having a molybdenum-containing wear-resisting layer it is known to compact a low-alloy iron powder for forming the body of said member and a non-alloyed iron-base metal powder, which contains molybdenum and is intended to form the wear-resisting layer, so as to form a shaped member, which is subsequently sintered. In order to reduce the manufacturing costs, it is proposed that in such process the metal powder for forming the wear-resisting layer contains a low-alloy iron powder and 10 to 30% by weight molybdenum and contains a total of 1.5 to 3.0% by weight carbon and phosphorus, carbon and phosphorus are optionally contained as alloying constituents in the iron powder of said metal powder in a total amount of 0.3 to 0.7% by weight, and the shaped member consisting of the body and the wear-resisting layer is subjected to liquid-phase sintering at temperatures from 1070.degree. to 1130.degree. C.

Abstract: A process of manufacturing a member formed with a shaft-receiving opening in that a compact formed with a through hole and comprising a sinterable powder is subjected to liquid-phase sintering is improved in that a bushing, which is made of a material produced by fusion metallurgy and is dimensionally stable under the conditions under which the compact is to be sintered, is inserted into the through opening of the compact with a play which is smaller than the extent of the unrestrained radial shrinkage of the compact at its through opening during its liquid-phase sintering, and the compact is subjected to liquid-phase sintering after the bushing has thus been inserted.

Abstract: To make a friction ring which is intended to be used in clutches or brakes and has a sinter-bonded friction facing, an annular blank is blanked from flat sheet metal and is provided with a sinter-bonded friction facing. Thereafter the blank provided with the sintered friction facing is shaped to form a conical or cylindrical friction ring and grooves distributed around the periphery of the friction facing are embossed into the friction facing at the same time. In order to ensure that that shaping operation will result in an adequate dimensional accuracy, the operation to emboss the grooves into the friction facing is carried out in such a manner that the backing ring is similarly embossed.

Abstract: To permit an economical manufacture of high-strength sintered members for use in valve timing mechanisms of internal combustion engine by powder metallurgy with liquid-phase sintering, an iron-base powder mixture is provided, which contains 13 to 18% by weight chromium or 3 to 6% by weight molybdenum as a carbide-forming alloying element in the iron alloy powder and also contains 1.5 to 2.6% carbon and 0.4 to 1.0% by weight phosphorus. A corresponding molten iron alloy is atomized into an entraining gas or water jet and is subsequently mixed with the remaining components of the powder.

Abstract: To make a sintered molding which is provided with at least one molybdenum containing wear-resisting facing (2), a low-alloy iron powder (10) which is intended to form the base of the molding and a carbon-free metal powder mixture (3) which is intended to form the wear-resisting facing (2) and consists of unalloyed iron particles and unalloyed molybdenum particles are jointly molded in a common mold (9) to form a molding, which is subsequently sintered.In order to prevent a mixing of the two metal powder layers, the metal powder which is intended to form the wear-resisting facing (2) is separately compacted to form a compact (5) before the mold (9) is charged with the iron powder (10) that is intended to form the base of the molding.

Abstract: In a process of manufacturing a substrate provided with a synthetic resin-bonded friction coating, the friction coating, which is joined to the substrate by a primer is formed in that a powder mixture which contains a friction powder and a synthetic resin powder is compacted and is cured at an elevated temperature.To eliminate the need for precompacting the powder mixture before it is applied to the substrate, said powder mixture is applied to the substrate to form a powder layer which can be compacted to the desired thickness of the friction coating. The powder layer which has been applied is then heated for a short time before the powder layer is compacted to the desired thickness of the friction coating.