Patent ID: 7156426

Claim:
A rotary transmission leadthrough for a fluid system for a hydraulic system, having a first rotary element designated as a first rotor and a second rotary element designated as stator, which rotary elements are arranged at least partly coaxially to one another and so as to be rotatable about a first rotation axis D 1 , characterized in that a third rotary element designated as second rotor ( 41 ) is arranged at least partly coaxially to a part ( 39 ) of the stator ( 38 ) and so as to be rotatable relative to said stator ( 38 ) about a second rotation axis D 2 different from the first rotation axis D 1 and at least one of the rotary elements have at least two fluid lines and at least one of the first rotor, second rotor and stator have an internal or external annular groove.