Abstract: A rotary joint assembly is disclosed which includes a stator and a rotor, the stator having a stationary conduit for supplying a coolant through the joint assembly to a rotary body and the rotor being rotatable with respect to the stator and accommodating the motion of said rotary body, the rotary body having stationary and rotating parts, the rotary joint assembly being constructed in that: the stator includes a housing having integral elements for fixing the rotary joint assembly to a stationary part of the rotary body; the rotor further includes a carrier, within the housing, coaxial with and surrounding the conduit element, for attaching the rotary joint assembly to a rotating part of the rotary body; and stationary seal and bearing elements being secured to the stator and extending between the stator and rotor, providing a stationary seal for the rotary joint assembly against the coolant and providing bearing elements allowing rotation of the rotor with respect to the stator for accommodating the motion