Patent ID: 7019432

Claim:
A plane commutator with a support member ( 1 ) made from insulating molding compound, a plurality of conductor segments ( 3 ) disposed uniformly around the commutator axis ( 2 ) and an equally large number of carbon segments ( 4 ), which are composed of monolithic carbon, which are connected interlockingly and electrically conductively to the conductor segments and which define the brush running surface ( 5 ), characterized by the following features: each carbon segment ( 4 ) is provided with an annular projection ( 13 ) disposed opposite the brush running surface ( 5 ), the annular end face ( 15 ) of the said projection being in contact with a corresponding annular contact face ( 16 ) of the associated conductor segment ( 3 ); the annular contact faces ( 16 ) are each surrounded by a contact ring ( 24 ) of the conductor segment ( 3 ) in question, which segment is in gap-free contact with the associated annular projection ( 13 ) in the region of the outer circumferential surface ( 23 ) thereof; on each conductor segment, there projects a contact pin ( 17 ) surrounded by the annular contact face, which pin engages without gaps in a corresponding bore ( 14 ) of the associated annular projection ( 13 ) of the carbon segment ( 4 ) in question in such a way that the carbon segments are each connected electrically conductively via the outer circumferential face ( 23 ), the annular end face ( 15 ) and the inner circumferential face ( 19 ) of the annular projection ( 13 ) to the conductor segments ( 3 ); the faces of the contact rings ( 24 ) used for connection to the carbon segments ( 4 ), the annular contact faces ( 16 ) and the outer circumferential faces ( 18 ) of the contact pins ( 17 ) are provided with an oxidation-resistant and corrosion-resistant finish.