Device for blocking a ring for axially retaining a blade, associated rotor disk and retaining ring, and rotor and aircraft engine comprising them

1. A device for rotationally blocking a ring for retaining blades on a rotor disk of a turbomachine in a substantially axial direction of said turbomachine,

said rotor disk being provided with hooks spread around its circumference and defining a groove for accommodating said retaining ring, including successive first and second blocking hooks, and said retaining ring being provided with a split and with at least one cleat and which is arranged on a ring face close to said split,

wherein the position of said at least one cleat on said retaining ring is such that, when said retaining ring is in place in said groove, said at least one cleat is in abutment against said first blocking hook, and the split is covered by said second blocking hook.

2. The rotation-blocking device as claimed in claim 1 , wherein:

said first blocking hook is provided with a check face on its side which faces the second blocking hook,

said cleat of the retaining ring is provided with a contact face on its side which is opposite to its side facing said split, and

said check face cooperates with said contact face in order to bring said cleat into abutment against said first blocking hook.

3. The rotation-blocking device as claimed in claim 1 or 2 , which comprises:

successive first and second blocking hooks of said rotor disk,

first and second cleats of the retaining ring, which are arranged on a ring face on the same side of said split, said first cleat being closer to said split than said second cleat,

and wherein the positions of said first and second cleats on the retaining ring are such that, when said retaining ring is in place in said groove, said first and second cleats are in abutment against said first blocking hook, on each side thereof, and said split is covered by said second blocking hook.

4. The rotation-blocking device as claimed in claim 3 , wherein:

said first blocking hook is provided with one check face on its side which faces said second blocking hook and with another check face on its opposite side,

said cleats of said retaining ring are each provided with a contact face, the contact face of said second cleat being on its side which faces said split, and the contact face of said first cleat being on its side which is opposite to its side facing said split,

and wherein said check faces cooperate with said contact faces in order to bring said cleats into abutment against said first blocking hook.

5. The rotation-blocking device as claimed in claim 1 or 2 , which comprises:

successive first and second blocking hooks of said rotor disk,

a single cleat of said retaining ring, arranged on a ring face close to said split,

and wherein the position of said cleat on said retaining ring is such that, when said retaining ring is in place in said groove, said cleat is in abutment against said first blocking hook and against said second blocking hook, and said split is covered by said second blocking hook.

6. The rotation-blocking device as claimed in claim 5 , wherein:

said first blocking hook is provided with a check face on its side which faces said second blocking hook,

said second blocking hook is provided with a check face on its side which faces said first blocking hook,

said cleat of said retaining ring is provided with two contact faces, one of said contact faces being on its side which faces said split, and the other of said contact faces being on its opposite side,

and wherein said check faces cooperate with said contact faces in order to bring said first and second blocking hooks into abutment against said cleat.

7. The blocking device as claimed in claim 2 , in which the groove has two walls, one internal wall which is closer to the rotor disk and one external wall which is further from the rotor disk, wherein each check face is situated on said corresponding blocking hook and extends in the axial direction, starting from the free surface of said blocking hook and continuing as far as the internal wall of said groove.

8. The blocking device as claimed in claim 2 , wherein each check face is oriented in a radial plane of said rotor disk.

9. The blocking device as claimed in claim 2 , wherein each check face is oriented in an oblique plane with respect to a radial plane of said rotor disk.

10. A turbomachine rotor, which comprises a blocking device as claimed in claim 1 .

11. An aircraft engine, which comprises a blocking device as claimed in claim 1 .

12. A ring for retaining the blades of a turbomachine rotor, intended to be combined with a rotor disk provided with hooks spread around its circumference, including a first blocking hook and a second blocking hook in succession, said first blocking hook being provided with one check face on its side which faces said second blocking hook and with another check face on its side opposite to its side which faces said second blocking hook, said ring comprising a split and two cleats which are arranged on a face of this ring, wherein said two cleats are disposed on the same side of said split such that they can be respectively in abutment against one of said two check faces of said first blocking hook.

13. A ring for retaining the blades of a turbomachine rotor, intended to be combined with a rotor disk provided with hooks spread around its circumference, including a first blocking hook and a second blocking hook in succession, said first blocking hook being provided with a check face on its side which faces said second blocking hook, and said second blocking hook being provided with a check face on its side which faces said first blocking hook, said ring comprising a split,

wherein said ring further comprises a single cleat, arranged on a ring face on one side of said split in the vicinity thereof, such that said single cleat can be in abutment against the check face of said first blocking hook and the check face of said second blocking hook.

14. A disk/ring assembly of a turbomachine,

comprising a retaining ring provided with a split,

and comprising a rotor disk provided with hooks spread around its circumference and defining a groove for accommodating said retaining ring,

wherein said rotor disk comprises a first blocking hook and a second blocking hook in succession,

wherein said retaining ring comprises at least one cleat arranged on a ring face close to said split,

and wherein the position of said cleat on said retaining ring is such that, when said retaining ring is in place in said groove, said cleat is in abutment against said first blocking hook, and the split is covered by said second blocking hook.

15. The disk/ring assembly as claimed in claim 14 , wherein

said first blocking hook is provided with a check face on its side which faces the second blocking hook,

said at least one cleat of the retaining ring is provided with a contact face on its side which is opposite to its side facing said split, and

said check face cooperates with said contact face in order to bring said cleat into abutment against said first blocking hook.

16. The disk/ring assembly as claimed in claim 14 , wherein said rotor disk comprises a first blocking hook and a second blocking hook in succession,

wherein said retaining ring comprises first and second cleats arranged on a ring face on the same side of said split, said first cleat being closer to said split than said second cleat,

and wherein the positions of said first and second cleats on the retaining ring are such that, when said retaining ring is in place in said groove, said first and second cleats are in abutment against said first blocking hook, on each side thereof, and said split is covered by said second blocking hook.

17. The disk/ring assembly as claimed in claim 16 , wherein

said first blocking hook is provided with one check face on its side which faces said second blocking hook and with another check face on its opposite side,

said cleats of said retaining ring are each provided with a contact face, the contact face of said second cleat being on its side which faces said split, and the contact face of said first cleat being on its side which is opposite to its side facing said split,

and wherein said check faces cooperate with said contact faces in order to bring said cleats into abutment against said first blocking hook.

18. The disk/ring assembly as claimed in claim 14 , wherein said rotor disk comprises a first blocking hook and a second blocking hook in succession,

wherein said retaining ring comprises a single cleat arranged on a ring face close to said split,

and wherein the position of said cleat on said retaining ring is such that, when said retaining ring is in place in said groove, said single cleat is in abutment against said first blocking hook and against said second blocking hook, and said split is covered by said second blocking hook.

19. The disk/ring assembly as claimed in claim 18 , wherein

said first blocking hook is provided with a check face on its side which faces said second blocking hook,

said second blocking hook is provided with a check face on its side which faces said first blocking hook,

said cleat of said retaining ring is provided with two contact faces, one of said contact faces being on its side which faces said split, and the other of said contact faces being on its opposite side,

and wherein said check faces cooperate with said contact faces in order to bring said first and second blocking hooks into abutment against said cleat.