System for attaching a turbojet engine spinner

1. An assembly for a turbomachine having a longitudinal axis, the assembly comprising:

a rotor;

a spinner coaxial with the longitudinal axis and which is attached removably to an upstream end of the rotor, the spinner including a plurality of radial teeth;

a flange provided at the upstream end of the rotor, the flange including a plurality of radial teeth and an annular groove which accommodates the radial teeth of the spinner to form a dog clutch; and

at least one rotation-proofing peg which extends radially relative to said axis and which prevents the spinner from rotating with respect to the rotor,

wherein said at least one rotation-proofing peg is carried by said flange and is able to occupy at least an unlocked position while being still carried by the flange, allowing the spinner to rotate with respect to the rotor, and a locked position, preventing any rotation of the spinner with respect to the rotor, said at least one rotation-proofing peg being urged into the locked position by a compression spring through which said at least one rotation-proofing peg passes.

2. The rotor according to claim 1 , further comprising a main housing in which a head of said at least one rotation-proofing peg can be housed when said at least one rotation-proofing peg is in the locked position, and against outer edges of the main housing against which the head of said at least one rotation-proofing peg is able to rest when said at least one rotation-proofing peg is in the unlocked position.

3. The assembly according to claim 2 , wherein the main housing is formed wholly in the flange and includes a bottom in which a hole is provided, said at least one rotation-proofing peg having a sliding fit with the hole.

4. The assembly according to claim 3 , wherein an auxiliary housing is formed in an internal wall of the spinner and which is intended to accommodate a free end of the rotation-proofing peg, when said at least one rotation-proofing peg is in the locked position.

5. The assembly according to claim 2 , wherein the main housing is formed in the flange and the spinner when the flange and spinner are joined together.

6. The assembly according to claim 1 , wherein the spinner comprises a hole which opens onto an outer surface of the spinner and is positioned facing a hole for the at least one rotation-proofing peg which is formed in an outwardly facing end thereof and able to accept an assembly tool for translationally moving the rotation-proofing peg and turning said at least one rotation-proofing peg about its axis.

7. The assembly according to claim 1 , wherein the compression spring can be compressed, when the at least one rotation-proofing peg is in the unlocked position, and can be at least partially relaxed when the least one rotation-proofing peg is in the locked position.

8. A turbomachine which comprises an assembly according to claim 1 .

9. The assembly according to claim 1 , wherein a head of the at least one rotation-proofing peg is rectangular.

10. An assembly for a turbomachine having a longitudinal axis, the assembly comprising:

a rotor;

a spinner coaxial with the longitudinal axis and which is attached removably to an upstream end of the rotor, the spinner including a plurality of radial teeth;

a flange provided at the upstream end of the rotor, the flange including a plurality of radial teeth and an annular groove which accommodates the radial teeth of the spinner to form a dog clutch; and

a rotation-proofing peg which prevents the spinner from rotating with respect to the rotor,

wherein the rotation-proofing peg is able to occupy at least an unlocked position, allowing the spinner to rotate with respect to the rotor, and a locked position, preventing any rotation of the spinner with respect to the rotor, the rotation-proofing peg being urged into the locked position by a compression spring through which the rotation-proofing peg passes,

wherein the flange includes a main housing including a hole through which the rotation-proofing peg passes, an axis of the hole extending radially, a head of the rotation-proofing peg being housed in the main housing when the rotation-proofing peg is in the locked position, and the head of the rotation-proofing peg resting against outer edges of the main housing at a radially inner side of the flange when the rotation-proofing peg is in the unlocked position, and

wherein the rotation-proofing peg is inserted radially into the main housing of the flange such that an axis of the rotation-proofing peg is perpendicular to the longitudinal axis.