Device for centering and rotationally guiding a shaft line of a turbine engine, and turbine engine

A turbine engine comprising a frame;

• a shaft line arranged in the frame, said shaft line being suitable for driving the rotation of a turbine;
• and a centering and guiding device for centering and rotationally guiding said shaft line, the shaft line capable of being driven to rotate about an axis of rotation, said device comprising:
• a first inner ring fixed to a shaft line, a first outer ring, a first ball bearing arranged between the first inner ring and the first outer ring, a first support supporting the first outer ring,
• a second inner ring fixed to the shaft line, a second outer ring, a second bearing arranged between the second inner ring and the second outer ring, and a flexible cage supporting the second outer ring;
• and the second bearing is spaced apart from the first ball bearing by a predefined axial spacing,
• said centering and guiding device being mounted on at least one shaft line among the shaft line of a speed reducer, the shaft line of an accessory drive chain, a front portion of the shaft line of a gas generator, and the shaft line of a free turbine wherein the stiffness of the first support is greater than the stiffness of the flexible cage, the first ball bearing, the first outer ring, and the first support are shaped such that a first clearance is provided between the first ball bearing and the first outer ring;
• the second bearing, the second outer ring, and the flexible cage are shaped so that a second clearance is provided between the second bearing and the second outer ring;
• the first clearance having a greater dimension in a radial direction than the second clearance.