Patent ID: 6844654

Claim:
A method for producing a drum commutator comprising a barrel-shaped support body ( 1 ) made of insulating compression-molding material, a plurality of metal conductor segments ( 3 , 3 ′) and an equal number of carbon segments ( 4 ), which are joined to the conductor segments ( 3 , 3 ′) in electrically conductive relationship, comprising the following steps: producing a metal conductor blank comprising a plurality of conductor segments, each two of which adjacent to one another are joined to one another via a bridge part ( 20 ), the distance from the radial inside faces of the bridge parts ( 20 ) to the commutator axis ( 2 ) corresponding substantially to the distance from the radial outside faces of the conductor segments ( 3 , 3 ′) to the commutator axis ( 2 ); producing a carbon shell with a substantially regular cylindrical outside face ( 26 ), at least the radial inside face and one axial end face of the carbon shell being metallized; joining the conductor blank together with the carbon shell in the axial direction to form electrically conductive contact zones ( 17 ) between the conductor segments ( 3 , 3 ′) and the metallized end face of the carbon shell; injection molding of a support body ( 1 ) made of insulating compression-molding material onto the composite part comprising the conductor blank and the carbon shell in an injection-molding die, the metallized radial inside face of the carbon shell being covered with compression-molding material; removing the bridge parts ( 20 ) with formation of an annular, closed, substantially regular cylindrical surface ( 19 ) with alternating zones of compression-molding material and metal; forming the carbon segments ( 4 ) by incising the carbon shell with axial cuts ( 16 ) extending in radial direction as far as the support body ( 1 ) and running in axial planes disposed between each two conductor segments ( 3 , 3 ′), the annular, closed, substantially regular cylindrical surface ( 19 ) with alternating zones of compression-molding material and metal being at least partly preserved.