The Housing 19 of the outer winding 8 is here with a between ring 20 directly connected with the multiblock housing 9. Instead the centrical and with a air gap to the Electricity an communication 45 channel 3 a hollow bevel 22 founted on to the Housing 19 hinged support to each other. The hollow bevel 22 gear the intermediate gear23, which also gear into into the Sprocket inner ring 4 therby into the rotary unions 4. Thereby is a reduction ratio between the rotating speed of the housing 19 and the whole block housing 9 reached.