Device for rotationally locking a clamping nut for a component on a shaft, clamping nut and shaft comprising it, and aircraft engine equipped therewith

1. A device for rotationally locking a clamping nut for a bearing outer race, on an end of a hollow shaft having an axial direction, said clamping nut being screwed inside said shaft, and said clamping nut having a first end in contact with said bearing outer race and a second end which is free, wherein the device comprises:

at least one shaft cutout disposed on the radially inner periphery of said end of the shaft;

at least one nut cutout disposed on the radially outer periphery of an end of said clamping nut; and

a locking plug configured to be placed in a locking hole, said locking hole formed by bringing the at least one shaft cutout into coincidence with the at least one nut cutout,

wherein said clamping nut includes a radially inner face which is substantially smooth and flares out in a direction towards the second end such that an inner radius at the second end of said clamping nut is greater than an inner radius at the first end of said clamping nut.

2. The rotation-locking device as claimed in claim 1 , which comprises an odd number of shaft cutouts and an even number of nut cutouts.

3. The rotation-locking device as claimed in claim 2 , which comprises thirteen shaft cutouts and twelve nut cutouts.

4. A nut for clamping a component inside an end of a hollow shaft, said clamping nut having an end in contact with said component and a free end, wherein the nut is configured to be locked against rotation by a rotation-locking device as claimed in claim 1 , and

wherein the nut comprises at least one nut cutout on the radially outer periphery of its free end.

5. The clamping nut as claimed in claim 4 , which additionally comprises a radially inner face which is substantially smooth and which flares out in the direction of its free end.

6. An aircraft engine which is equipped with a clamping nut as claimed in claim 4 .

7. A hollow shaft configured to cooperate with a clamping nut for maintaining a component inside one of its ends, wherein the shaft is designed to be able to be locked against rotation by a rotation-locking device as claimed in claim 1 , and

wherein the shaft comprises at least one shaft cutout on the radially inner periphery of said end of said shaft, and a locating groove disposed on an inner face of an end rim of said shaft.

8. An aircraft engine which is equipped with a hollow shaft as claimed in claim 7 .

9. An aircraft engine which is equipped with a rotation-locking device as claimed in claim 1 .

10. The rotation-locking device as claimed in claim 1 , wherein said clamping nut includes at least one tightening slot disposed on the outer periphery end.

11. The rotation-locking device as claimed in claim 1 , wherein said shaft includes at least one oil passage configured to circulate oil between the bearing outer race and an end face of said shaft.

12. A device for rotationally locking a clamping nut for a bearing outer race, on an end of a hollow shaft having an axial direction, said clamping nut being screwed inside said shaft, and said clamping nut having a first end in contact with said component and a second end which is free, wherein the device comprises:

at least one shaft cutout disposed on the radially inner periphery of said end of the shaft;

at least one nut cutout disposed on the radially outer periphery of an end of said clamping nut; and

a locking plug configured to be placed in a locking hole, said locking hole formed by bringing the at least one shaft cutout into coincidence with the at least one nut cutout; and

a retention ring configured to retain said locking plug in an axial direction.

13. The rotation-locking device as claimed in claim 12 , wherein the retention ring comprises at least one retention lug extending radially inward, the number of retention lugs being identical to the number of shaft cutouts.

14. The rotation-locking device as claimed in claim 13 , wherein said retention ring has indentations which open radially inward, each indentation being situated between two successive retention lugs.

15. The rotation-locking device as claimed in claim 12 , further comprising a finger on said retention ring and a notch in the shaft, said finger and said notch cooperating to prevent rotation of said retention ring.

16. The rotation-locking device as claimed in claim 15 , wherein said notch is situated opposite a shaft cutout in an axially projecting end rim of the shaft.

17. The rotation-locking device as claimed in claim 16 , wherein said finger extends radially outward opposite one of said locking plugs.

18. The rotation-locking device as claimed in claim 17 , wherein said retention ring includes an assembly gap.

19. The rotation-locking device as claimed in claim 18 , wherein said assembly gap and said finger are positioned in a diametrically opposed manner on said retention ring.

20. The rotation-locking device as claimed in claim 12 , further comprising a locating groove for locating said retention ring, said groove being disposed on a radially inner end face of the shaft.