Rotor recentering after decoupling

A recentering device for a rotor shaft for recentering a rotor shaft relative to an axis X of a stator structure in an event of a decoupling caused by excessive imbalance, said shaft, in an absence of said decoupling, lying on the axis X and being radially supported by a bearing support disposed in a bore of the axis X in said stator structure, said bearing support having an outside diameter that is smaller than a diameter of said bore, to enable said bearing support to orbit about the axis X in the event of said decoupling, said bearing support being connected to the stator structure by radially fusible elements, said device comprising:

• means for recentering the bearing support after said decoupling,
• wherein the recentering means of the bearing support comprises means for generating a movement in precession by said bearing support in a direction contrary to a direction of said bearing support's orbits traveled after said decoupling, and a plurality of devices for decreasing permitted clearance of said bearing support relative to the axis X, said devices for decreasing permitted clearance being arranged regularly around the axes of two parts constituted by the stator structure and the bearing support, and each part including a first ramp provided on one of said two parts and a protuberance provided on the other of said two parts, said protuberance being, in the absence of said decoupling, radially spaced apart apart from said first ramp and configured to come into contact with said first ramp during the movement in precession of said bearing support.