ROTARY TRANSMISSION DEVICE FOR TRANSMITTING CONTROL AND/OR WORKING PRESSURES TO A WHEEL HUB OR A VEHICLE WHEEL RECEIVED BY THE WHEEL HUB

The invention provides a rotary transmission device for transmitting control and/or working pressures to a wheel hub or a vehicle wheel received by the wheel hub. The rotary transmission device has ahousing structure in which a piston element is displaceable between a first position and a second position relative to the housing structure and relative to a running body of the wheel hub which is mounted so as to rotate about a wheel axis relative to the housing structure. To transmit the control and/or working pressures, at least one pressure medium channel is formed in the piston element. In the first position of the piston element, an air gap is present between an end face of the piston element on the running body side and an end face of the running body on the piston element side, whilein the second position of the piston element, no air gap is present between the end face of the piston element on the running body side and the end face of the running body on the piston element side,and the at least one press