Self-compensating dynamic joint

The invention relates to a self-compensating dynamic joint (32), between two parts (11, 21) of a device, a fixed part and a part rotating about an axis of rotation on the fixed part, said joint providing the seal for the device relative to the outside. The above comprises a seal piece (321) with a coefficient of expansion given with the temperature, provided with a sweeping face (322) comprising a swept surface (111) on a first part (11), mounted with a hermetic seal in a rigid mechanical structure (323), connected to the second part (21), with a compensation element (324), forming the connection between the mechanical structure and the second part in a hermetically-sealed manner. The compensation element may be deformed with temperature, of such an embodiment that, on temperature variations taking place, the movements of the mechanical structure, as a result of the deformation of the compensation element, guarantee the contact of the sweeping face of the sealing piece with the swept surface.