Friction ring for clutches or brakes, and a method and device for producing the friction ring

A friction ring for use in clutches, brakes and synchronizing equipment, said friction ring consisting of an annular metallic element which has at least one cylindrical or conical face and an uneven lining of powdered friction material attached to at least one said cylindrical or conical face of said annular metallic element, said friction ring being formed by the steps of

• (a) providing a flat metallic plate which has opposite planar surfaces,
• (b) spraying a layer of a powdered friction material onto at least one of said opposite planar surfaces of said flat metallic plate,
• (c) sintering said at least one layer of powdered friction material so that it becomes attached to the surface of said flat metallic plate on which it was sprayed,
• (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends,
• (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and
• (f) welding said abutting ends of said closed annular element.

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of

• (a) providing a flat metallic ring having opposite planar surfaces and inner and outer peripheral edges,
• (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic ring,
• (c) sintered said at least one said layer of powdered friction material, and
• (d) reshaping said flat metallic ring with said at least one sintered layer of powdered friction material thereon so that it has a cylindrical or conical shape.

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of

• (a) providing a flat metallic plate having opposite planar surfaces,
• (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic plate,
• (c) sintering said at least one layer of powdered friction material,
• (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends,
• (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and
• (f) welding said abutting ends of said annular element.