Apparatus to centre a tube in a turbine shaft

The invention relates to a centering device for a tube (3) or a room inside of a shaft (2) in a hollow turbine turbomachine, said tube (3) or said part being integral in rotation said shaft (2) at its ends, this device comprising a sheath (9) integral with said tube (3) and surrounding the latter, a ring spring (20) interposed between the sleeve (9) and the shaft (2) and having pairs of diametrically opposite pads which extend radially outward, and means for allow ring expansion (20) after assembly of the device so that said pads are supported against the wall interior of the shaft, characterized in that the pads are formed by thin walls (25) having cylindrical and elastic resting a slightly different outer diameter of the diameter inside the shaft (2) and matching the internal hollow wall (21) the shaft (2) after assembly.