Rotary transmission apparatus for the transmission of control and/or working pressures to a fluid duct in the interior of a shaft

A rotary transmission apparatus for the transmission of a control pressure and/or working pressure to a fluid duct that is received or configured at least in regions in an interior of a shaft, the rotary transmission apparatus comprising:

• a stator assembly that is arranged in a stationary manner with respect to a rotational movement of the shaft and has at least one fluid feed/discharge line and a control element that can be displaced in a shaft longitudinal direction (L) relative to the shaft between a first position and a second position, a flow connection between the at least one fluid feed/discharge line and the fluid duct being interrupted in the first position of the control element, and a flow connection between the at least one fluid feed/discharge line and the fluid duct established in the second position of the control element,
• wherein the control element includes a front end region as viewed in the shaft longitudinal direction (L) and an opposite rear end region, the front end region being assigned a first seal in the form of a sealing lip, and the rear end region being assigned a second seal in the form of a sealing lip, the first and second seal being connected to the control element in such that they are also moved in the case of a longitudinal displacement of the control element relative to the shaft, and, in the second position of the control element, the seals sealing a fluid space with respect to a circumferential face of the shaft, which fluid space is configured as an annular space, whereas, in the first position of the control element, the seals are contact-free or at least substantially contact-free in relation to the circumferential face of the shaft.