Importance

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Abstract

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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First Claim