Patent ID: 7098568

Claim:
Current-transfer assembly for electric machines, especially generators of e.g. wind power plants, comprising a shaft ( 20 ) with electrically conductive slip elements ( 14 , 128 , 132 , 134 ) originating from and coaxially surrounding said shaft, said slip elements supporting contact elements such as carbon brushes, wherein various electric phases are connected to the slip elements that are insulated from one another by means of current paths that lead the windings of the electric machine such as conductor pins or conductor rods ( 84 ), wherein the slip elements ( 12 , 14 , 16 , 18 , 22 , 124 , 126 , 128 , 130 , 132 , 134 ) are disc elements containing carbon material, and the disc element ( 22 ) comprise perforations ( 26 , 28 , 30 , 32 , 34 , 36 , 38 ); wherein in at least one perforation a bushing ( 50 ) consisting of an electrically conductive material is inserted in a snug fit, said bushing ( 50 ) protrudes on both lateral surfaces ( 40 , 42 ) of the disc element ( 22 ); wherein each lateral surface ( 40 , 42 ) of the disc element ( 22 ) has a contact plate ( 52 ), wherein the contact plates is made of electrically conductive material resting against the lateral surface of the disk element having perforations ( 26 , 28 , 30 , 32 , 34 , 36 , 38 ) with a bore pattern that corresponds to the perforations of the disc-element, and the bushing ( 50 ) with its peripheral face sections ( 54 , 56 ) that protrude beyond the lateral surfaces ( 40 , 42 ) of the disc element ( 22 ) at a dimension H is inserted in one of the perforations of the contact plate ( 52 ).