Hoerbiger & Co.

Sinterstahl Gesellschaft

Ulrich Wollenteit

Walter Knoess

Hermann Putz

A process is provided for the manufacture of a gearshifting or sliding sleeve for the forced synchronization of manually shifted automotive transmissions in which the sleeve is manufactured in the form of two substantially symmetrical partial units and is then processed further into a complete sleeve by means of customary joining methods. This process permits sleeves to be manufactured by means of comparatively low-cost powder metallurgical methods through pressing and sintering, and thus makes it possible to dispense with very cost-intensive machining methods.

Gearshifting or sliding sleeve for automobile transmissions and a

A friction ring for clutches and brakes consists of an annular metal element having at least one cylindrical or conical friction surface comprising a spray-sintered friction lining. The friction linings are directly sintered onto the annular element itself, the intially planar friction surfaces being formed, after applying the spray-sintered friction linings, into cylindrical or conical shape by a non-cutting shaping process such as stamping, deepdrawing or the like. The method of producing the friction ring comprises producing an annular metal element, applying a spray-sintered friction lining on to one or both sides thereof and shaping the annular element together with the sintered linings applied thereto into a cylindrical or conical form. The shaping is performed by means of a shaping tool comprising a die and an associated plunger working on the annular element. To avoid detrimental effect of the device to the porous spray-sintered friction lining, a layer or sheet of rubber or plastic is provided between the annular element and the shaping surface of the plunger and/or the die, respectively.

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Munich, Germany

Ulrich Wollenteit