Device for coupling two aircraft turbine engine parts

Abstract

The invention relates to a coupling device (80) for coupling two parts (10, 20) of a turbine rotor (1) having a longitudinal axis (X), the device comprising a nut (30) to ensure the second part (20) is longitudinally locked onto the first part (10) by being screwed onto the first part (10). The coupling device (80) comprises a brake (40) that comprises a first rotational coupling member (41) that co-operates with a complementary first rotational coupling member (31) provided on the nut (30) in a first coupling position, wherein the brake (40) is free to move in longitudinal translation relative to the nut (30), a second rotational coupling member (42) that co-operates with a complementary second rotational coupling member (22) of the second part (20) in a second coupling position during the first coupling position, and a longitudinal locking element (50) that longitudinally locks the brake (40) onto the nut (30) in the second coupling position.

Description

Description Title: Device for coupling two parts of an aircraft turbomachine

[0001] The invention relates to the field of devices for coupling two turbine rotor parts, such as an aircraft turbomachine, for example a turbojet or a turboprop.

[0002] In certain turbomachine architectures, such a coupling device may comprise a nut for tightening the two rotor parts, the nut then being provided with a thread cooperating with another thread made on the first of the two rotor parts to be coupled, for example a rotor shaft.

[0003] Thus, the present invention relates to a coupling device between a first rotating rotor part and a second rotating turbine rotor part extending along a longitudinal axis X, the first rotor part being provided with a first thread, the coupling device comprising a nut which is provided with a nut thread intended to cooperate with the first thread, this nut being intended to block the second rotor part on the first rotor part along the longitudinal axis.

[0004] In a known embodiment, illustrated in figures 11 and 12, in order to limit the radial size of the coupling device, a nut 130 of the “shur-lock” ® type and a locking element 140 are used. The nut 130 is screwed onto a first thread of the first part 110 which is a rotor shaft. The nut 130 has on its circumference several notches 131 along the longitudinal axis X. A locking element 140 is fitted onto the rotor shaft 110, which is a ring having on its circumference several fingers 141 which extend along the longitudinal axis X and which are the same number as the notches 131. The locking element 140 has teeth on its radially internal face. The rotor shaft 110 has longitudinal grooves 111 over the entire circumference of a portion of its radially outer face, which is a portion adjacent to the nut 130. These grooves 111 have been machined over this entire circumference.The teeth of the locking element 140 are able to slide longitudinally (along the X axis) in these grooves 111. The element is translated longitudinally. locking 140 until each of the fingers 141 are substantially opposite one of the notches 131. This situation is shown in figure 11 (the second part is not shown). Then the locking element 140 continues to be translated longitudinally until the teeth begin to engage in the grooves 111. In order for the fingers 141 to be able to engage in the notches 131, it is necessary to apply an overtorque to the nut 130 so that the notches 131 are located exactly opposite the fingers 141 longitudinally. The locking element 140 then continues to be translated longitudinally until the fingers 141 are housed in the notches 131. This situation is shown in Figure 12. Thus, the locking element 140 prevents the rotation of the nut 130 relative to the first part (rotor shaft 110) by becoming integral with this first part via the grooves 111.

[0005] However, this securing of the locking element to the first part requires machining of this first part (in this case machining of the grooves), which generates additional cost and loss of time. Description of the invention

[0006] The present invention aims to remedy these drawbacks.

[0007] The invention aims to provide a two-part coupling device which comprises a nut, which has the smallest possible radial space requirement and which avoids machining or modification of the first rotor part in addition to the thread used to screw the nut onto the first rotor part.

[0008] This object is achieved by the fact that the coupling device comprises a brake which comprises a first rotational coupling member intended to cooperate with a first complementary rotational coupling member provided on the nut in a first rotational coupling position, the brake being free in longitudinal translation relative to the nut in the first rotational coupling position, and which comprises a second rotational coupling member intended to cooperate with a second complementary rotational coupling member provided on the second part in a second rotational coupling position during the first rotational coupling position, the coupling device further comprising a longitudinal locking element which is intended to cooperate with the brake and with the nut to longitudinally lock the brake on the nut in the second rotational coupling position.

[0009] Thanks to these provisions, the nut is locked in rotation using a part, called a brake, which is not secured directly to the first part but which is secured directly to the nut (in the first coupling position) while being free in longitudinal translation relative to this nut and therefore relative to the first part, then which is secured to the second part (in the second coupling position). In addition, the brake is locked longitudinally on the nut by means of the longitudinal locking element. This avoids having to machine or modify the first part.

[0010] For example, the first rotating coupling member is a set of N teeth distributed regularly around the circumference of the brake and the first complementary rotating coupling member is a set of N notches distributed regularly around the circumference of the nut, such that in the first rotating coupling position each of the teeth is housed in one of the notches

[0011] This ensures easy coupling between the brake and the nut, and helps to minimize the radial thickness of the brake and therefore of the coupling device.

[0012] For example, the second rotating coupling member is a finger and the second complementary rotating coupling member is a set of P housings distributed regularly around the circumference of the second part with P different from N, such that in the second rotating coupling position the finger is housed in one of the housings.

[0013] This ensures easy coupling between the brake and the second part, and helps to minimize the radial thickness of the brake and therefore of the coupling device.

[0014] For example, the brake is a ring that radially covers the nut, the teeth being arranged on the radially inner face of the brake and the notches being arranged on the radially outer face of the nut.

[0015] This helps to minimize the radial thickness of the brake.

[0016] For example, in the second rotational coupling position the brake is locked in translation in one direction by the longitudinal locking element and in the other direction by the second part.

[0017] Thus, the brake is held integral with the nut both in rotation and in longitudinal translation.

[0018] For example, in the second rotational coupling position the brake is locked in translation in one direction by the longitudinal locking element and in the other direction by the nut.

[0019] Thus, the brake is held integral with the nut both in rotation and in longitudinal translation.

[0020] For example, the longitudinal locking element is a split O-ring that is housed in a groove in the nut.

[0021] This makes it easier to assemble the longitudinal locking element with the nut.

[0022] For example, the first part is a rotor shaft and the second part is a sleeve that is slidable over the first part.

[0023] For example, in the first coupling position and before the second coupling position, the brake is not rotationally secured to the second part.

[0024] For example, the turbine is an aircraft turbomachine.

[0025] The invention also relates to a method for coupling a first rotating turbine rotor part which is provided with a first thread and a second rotating turbine rotor part which comprises a second complementary rotational coupling member, the turbine extending along a longitudinal axis X.

[0026] According to the invention, the method comprises the following steps: (a) a nut is provided which is provided with a nut thread and a first complementary rotational coupling member, a brake which comprises a first rotational coupling member and a second rotational coupling member, and a longitudinal locking element; (b) the nut is secured to the first part by screwing the nut thread onto the first thread so as to lock the second part onto the first part according to the longitudinal axis X; (c) the first rotational coupling member is made to cooperate with the first complementary rotational coupling member by longitudinal translation of the brake in order to secure the brake to the nut in a first rotational coupling position, the brake being free in longitudinal translation relative to the nut; (d) after step (c), the second rotational coupling member is made to cooperate with the second complementary rotational coupling member by rotation of the assembly formed by the nut and the brake in order to secure the brake to the second part in a second rotational coupling position; (e) the brake is longitudinally locked on the nut in the second rotational coupling position using the longitudinal locking element.

[0027] The invention will be better understood and its advantages will appear better on reading the detailed description which follows, of embodiments shown as non-limiting examples. The description refers to the appended drawings in which:

[0028] [Fig. 1] Figure 1 is a longitudinal sectional view of a turbojet engine.

[0029] [Fig. 2] Figure 2 is a perspective and longitudinal sectional view of the coupling device according to the invention, before screwing the nut onto the first part.

[0030] [Fig. 3] Figure 3 is a perspective and longitudinal sectional view of the coupling device according to the invention, after screwing the nut onto the first part and before achieving the first coupling position.

[0031] [Fig. 4] Figure 4 is a perspective and longitudinal sectional view of the coupling device according to the invention, after achieving the first coupling position and before achieving the second coupling position.

[0032] [Fig. 5] Figure 5 is a perspective and longitudinal sectional view of the coupling device according to the invention, after achieving the second coupling position.

[0033] [Fig. 6] Figure 6 is a longitudinal sectional view of the coupling device of Figure 5.

[0034] [Fig. 7] Figure 7 is a perspective view of a portion of the brake of the coupling device of Figure 5.

[0035] [Fig. 8] Figure 8 is a longitudinal sectional view of a variant of the coupling device according to the invention.

[0036] [Fig. 9] Figure 9 is a longitudinal sectional view of another embodiment of the coupling device according to the invention.

[0037] [Fig. 10] Figure 10 is a perspective view of a portion of the brake of the coupling device of Figure 9.

[0038] [Fig. 11] Figure 11, already described, is a perspective view of a coupling device according to the prior art, before assembly / locking.

[0039] [Fig. 12] Figure 12, already described, is a perspective view of the coupling device according to the prior art of Figure 11, after assembly / locking. Detailed description of the invention

[0040] The invention is described below in the case of an aircraft turbomachine. However, the invention applies to any turbine 1. Figure 1 illustrates an aircraft turbomachine 1 which is a double-flow, double-spool turbojet. However, this turbomachine 1 could be of another type, for example a turboprop, without departing from the scope of the invention.

[0041] The turbomachine 1 has a longitudinal axis X around which its various components extend. The turbomachine 1 comprises, from upstream to downstream along a main direction D of flow of the gases through this turbomachine 1, a fan 91, a low-pressure compressor 92, a high-pressure compressor 93, a combustion chamber 94, a high-pressure turbine 95 and a low-pressure turbine 96. In normal operation, after passing through the fan 91, the air divides into a central primary flow F1 and a secondary flow F2 which surrounds the primary flow F1. The primary flow F1 flows in a main gas circulation vein V1 which passes through the low pressure compressor 92 and the high pressure compressor 93, the combustion chamber 94, the high pressure turbine 95 and the low pressure turbine 96. The secondary flow F2 flows in a secondary vein V2 delimited radially towards the outside by a motor casing, surrounded by a nacelle 87.

[0042] Figure 2 represents a coupling device 80 of a first rotating part 10 of the rotor of the turbomachine and a second rotating part 20 of the rotor of the turbomachine 1, having the same axis of rotation which is the longitudinal axis X. For example, this first part 10 is a rotor shaft. The second part 20 is slidably mounted on the first part 10 like a sleeve.

[0043] The first part 10 is provided with a first thread 18. The coupling device 80 comprises a nut 30 which is provided with a nut thread 38 intended to cooperate with the first thread 18 so as to be screwed onto the first part 10. The nut 30 surrounds a section of the first part 10. Thus, this nut 30, when it is screwed onto the first part 10, is capable of blocking the second part 20 in longitudinal translation (i.e. in the direction of the longitudinal axis X) against a shoulder of the first part 10 (for the sake of clarity this shoulder is not shown). Figure 2 shows the nut 30 before it is screwed on, and Figure 3 shows the nut 30 after it is screwed on the first part 10. The second part 20 is thus blocked in one direction by this shoulder and in the opposite direction by the nut 30. The coupling device 80 further comprises a brake 40. The brake 40 is mounted on the first part 10 so as to surround a section of the first part 10.The brake 40 is free in translation and rotation relative to the first part 10 with which it is not in contact.

[0044] The brake 40 comprises a first rotational coupling member 41 which is intended to cooperate with a first complementary rotational coupling member 31 provided on the nut 30. This cooperation constitutes a first rotational coupling position between the brake 40 and the nut 30, in which the brake 40 is locked in rotation relative to the nut 30. For example, the nut 30 is already screwed onto the first part 10 before this coupling. In this first rotational coupling position, the brake 40 is free in longitudinal translation relative to the nut 30, at least over a certain length.

[0045] Figures 2 to 5 illustrate an exemplary embodiment of the first rotational coupling member 41 and the first complementary rotational coupling member 31. These figures are perspective and longitudinal section views of the coupling device 80 in the vertical plane V passing through the longitudinal axis X. The first rotational coupling member 41 is a set of N teeth 415 distributed regularly around the circumference of the brake 40. N is an integer. The first complementary rotational coupling member 31 is a set of N notches 315 distributed regularly around the circumference of the nut 30. The notches 315 are separated by projections 32, visible in Figures 2 and 3. The circumferential width of each notch 315 is at least equal to the circumferential width of each tooth 415.

[0046] In the first rotational coupling position, each of the teeth 415 is partially engaged in one of the notches 315 and is locked in rotation (around the longitudinal axis X) such that the nut 30 and the brake 40 are integral in rotation. In this first rotational coupling position, the brake 40 is free in longitudinal translation relative to the nut 30 because the teeth 415 are not fully engaged in the notches 315. Figure 4 shows the coupling device 80 in its first coupling position and before its second coupling position (see below). In this situation (before the second coupling position), the brake 40 is not integral in rotation with the second part 20.

[0047] The brake 40 comprises a second rotational coupling member 42 which is intended to cooperate with a second complementary rotational coupling member 22 provided on the second part 20. This cooperation constitutes a second rotational coupling position between the brake 40 and the second part 20, in which the brake 40 is locked in rotation relative to the second part 20. This second rotational coupling position takes place while the first rotational coupling position is already achieved. Consequently, the second part 20 is also locked in rotation relative to the nut 30. Figure 5 shows the coupling device 80 in its second coupling position.

[0048] For example, the second rotational coupling member 42 is a finger 425 and the second complementary rotational coupling member 22 is a set of P housings 225 distributed regularly around the circumference of the second part 20 and separated by teeth 23. P is an integer different from N, such that in the second rotational coupling position the finger 425 is housed in one of the housings 225.

[0049] In the first coupling position, the finger 425 is not necessarily opposite (i.e. aligned longitudinally) one of the housings 225. In this case, given that the brake 40 is integral in rotation with the nut 30, it is necessary to apply an overtorque to the nut 30 in order to bring the finger 425 opposite one of the housings 225. By “application of an overtorque” is meant an additional screwing of the nut 30 onto the first part 10. The brake 40 can then be translated longitudinally relative to the nut 30 to engage the finger 425 in one of the housings 225, in order to achieve the second coupling position. In this translation, the teeth 415 are engaged more deeply in the notches 315 than in the first coupling position, as illustrated in Figure 5. Thus, the teeth 415 are engaged over their entire length in the notches 315.The teeth 415 do not come into abutment against the bottom of the notches 315 when these notches 315 are blind. Alternatively, the notches 315 are open-ended, that is to say they extend over the entire length of the nut 30.

[0050] Figure 6 is a sectional view in the vertical longitudinal plane V (sectional plane) of Figure 5, i.e. in the second rotational coupling position.

[0051] It is advantageous for the overtorque applied to the nut 30 to be as low as possible. However, from any angular position of the brake 40, the angle by which the brake 40 must be pivoted in order to place the finger 425 opposite one of the P housings 225 is at most equal to 0 = |P - N| / (NP) where |x| is the absolute value of x. Advantageously, the number P is close to the integer N, ideally is distinct from N by 1, which minimizes the maximum angle 0. For example, the integer P is a prime number.

[0052] Advantageously, the brake 40 is a ring which radially covers the nut 30. This ring comprises a ring 43, and the teeth 415 are regularly distributed on the radially internal face of the ring 43. The notches 315 are regularly distributed on the radially external face of the nut 30. In the first and second coupling positions, the radially internal face of the ring 43 matches the radially external face of the nut 30. Thus, the radial size of the assembly formed by the brake 40 and the nut 30 in the second coupling position is minimal. Figure 7 illustrates such a brake 40 in perspective (only a circumferential portion of the brake 40 is shown taking into account the symmetry). The finger 425 extends in the extension of the ring 43 along the longitudinal axis X. Between each pair of adjacent teeth 415 the radially internal face of the ring 43 is free of any relief so that the projections 32 of the nut 30 can slide freely between the teeth 415.

[0053] In the second coupling position, the longitudinal edge of the ring 43 on the side of the finger 425 comes into abutment against the longitudinal edge of the teeth 23 of the second part 20.

[0054] The coupling device 80 further comprises a longitudinal locking element 50 which is intended to cooperate with the brake 40 and with the nut 30 to longitudinally lock the brake 40 on the nut 30 in the second rotational coupling position. For example, this longitudinal locking element 50 is a split O-ring which is housed in a groove 35 of the nut 30. The groove 35 is formed on the radially inner face of the projections 32 of the nut 30, and is therefore regularly interrupted at the notches 315. Thus, when the teeth 415 of the brake 40 engage in the notches 315, they encounter this O-ring 50. The teeth 415 have on their radially inner face a protuberance 416 (visible in FIGS. 6 and 7).In the translation of the brake 40 from the first coupling position to the second coupling position, the protrusions 416 engage and pass through the O-ring 50 such that the brake 40 is clipped onto the O-ring 50. Thus, in the second coupling position, the brake 40 is blocked in longitudinal translation in one direction by the teeth 23 and in the other direction by the O-ring 50.

[0055] In figures 2 to 7 above (main case), the finger 425 is located in the longitudinal extension of the rest of the brake 40 and the P housings 225 are located in the longitudinal extension of the ring of the brake 40.

[0056] Alternatively, the finger 425 extends radially outwards and the P housings 225 are located on a crown 24 of the second part 20 which is located radially outwards relative to the ring 43 of the brake 40. This crown 24 constitutes the second complementary rotational coupling member 22. The second rotational coupling position is thus achieved by engagement of the finger 425 with one of the P housings 425 of the crown 24. This variant is shown in Figure 8. The rest of the geometry of the brake 40 is unchanged compared to the main case. In the second coupling position, the brake 40 is blocked in longitudinal translation in one direction by the second part 20 and in the other direction by the O-ring 50.

[0057] The embodiment described above, with reference to Figures 2 to 8, represents a first embodiment in which, in the second rotational coupling position, the brake 40 is blocked in translation in one direction by the longitudinal blocking element 50 and in the other direction by the second part 20.

[0058] In a second embodiment, an example of which is illustrated with reference to Figures 9 and 10, the brake 40 is locked in translation in the second coupling position in one direction by the longitudinal locking element 50 and in the other direction by the nut 30. Figure 9 is a sectional view of the coupling device 80 in the vertical longitudinal plane V. The brake 40 is identical to the brake 40 in the first embodiment but additionally has a circumferential rim 44 which is oriented radially inwards (towards the longitudinal axis X) and which extends over the entire circumference of the ring 43 on the longitudinal edge of the ring 43 which is opposite the finger 425.In the translation of the brake 40 from the first coupling position to the second coupling position, the protrusions 416 engage and pass over the O-ring 50 such that the brake 40 is clipped onto the O-ring 50, and the rim 44 comes into abutment against the projections 32 of the nut 30. Thus, in the second coupling position, the brake 40 is blocked in longitudinal translation in one direction by the nut 30 (via the projections 32) and in the other direction by the O-ring 50.

[0059] In the first embodiment and in the second embodiment, and in all cases, in the second coupling position the brake 40 is locked in translation in a first direction. The brake 40 is then locked in translation in a direction opposite to this first direction by the longitudinal locking element.

[0060] Figure 10 illustrates the brake 40 of Figure 9 in perspective (only a circumferential portion of the brake 40 is shown for reasons of symmetry).

[0061] The method of coupling the first part 10 and the second part 20 with the coupling device according to the invention as described above is summarized below.

[0062] In a step (a) a nut 30 is provided which is provided with a nut thread 38 and a first complementary rotational coupling member 31, a brake 40 which comprises a first rotational coupling member 41 and a second rotational coupling member 42, and a longitudinal locking element 50. An example of this situation is illustrated in FIG. 2.

[0063] In a step (b) the nut 30 is secured to the first part 10 by screwing the nut thread 38 onto a first thread 18 of the first part 10 so as to block the second part 20 on the first part 10 along the longitudinal axis X. At this step, the brake 40 does not cooperate with either the nut 30 or the second part 20. An example of this situation is illustrated in figure 3.

[0064] In a step (c) the first rotational coupling member 41 (for example teeth 415) is made to cooperate with the first complementary rotational coupling member 31 (for example notches 315) by longitudinal translation of the brake 40 in order to secure the brake 40 with the nut 30 in a first rotational coupling position, the brake 40 being free in longitudinal translation relative to the nut 30. At this step, the brake 40 does not cooperate with the second part 20. An example of this situation is illustrated in FIG. 4, in the case where step (c) takes place after step (b).

[0065] In a step (d), after step (c), the second rotational coupling member 42 (for example a finger 425) is made to cooperate with the second complementary rotational coupling member 22 (for example housings 225) by rotation of the assembly formed by the nut 30 and the brake 40 (relative to the first part 10) in order to secure the brake 40 with the second part 20 in a second rotational coupling position. To effect this rotation of the assembly formed by the nut 30 and the brake 40, a screwing overtorque is applied to the brake 30 until the second rotational coupling member 42 is aligned (along the longitudinal axis X) with the second complementary rotational coupling member 22. Then these two second members are coupled by longitudinal translation of the brake 40 relative to the second part 20.Thus, at this stage, the brake 40 cooperates with both the nut 30 and the second part 20, i.e. both the first rotational coupling position and the second rotational coupling position are achieved.

[0066] In a step (e) the brake 40 is longitudinally locked on the nut 30 in the second rotational coupling position using the longitudinal locking element 50. In this position the brake 40 comes into abutment either against the second part 20 or against the nut 30 in order to be locked in longitudinal translation in one direction by this abutment and in the other direction by the locking element 50. An example of this situation is illustrated in FIG. 5.

[0067] In the above description with reference to the figures, step (c) takes place after step (b), i.e. the nut 30 is screwed onto the first part 10 before the brake 40 is secured in rotation with the nut 30 (first possibility). Alternatively, step (b) takes place after step (c), i.e. the brake 40 is secured with the nut 30 in the first rotational coupling position before the nut is screwed onto the first part 10 (second possibility). The nut 30 is then screwed onto the first part 10, which causes the brake 40 to rotate simultaneously. Both possibilities are covered by the method according to the invention.

[0068] In the above description with reference to the figures, step (e) is simultaneous with step (d) (first option), that is to say that in the longitudinal translation of the finger 425 in the housings 225 the brake 40 is locked with the locking element 50. Alternatively, step (e) takes place after step (d) (second option), that is to say that the longitudinal locking of the brake 40 by the locking element 50 is carried out only after the brake 40 is secured in rotation with the second part 20. The method according to the invention covers these two options.

Claims

Claims

1. Coupling device (80) between a first rotating part (10) of a turbine rotor (1) and a second rotating part (20) of a turbine rotor (1) extending along a longitudinal axis (X), said first rotor part (10) being provided with a first thread (18), said coupling device (80) comprising a nut (30) which is provided with a nut thread (38) intended to cooperate with said first thread (18), said nut (30) being intended to lock said second rotor part (20) on said first rotor part (10) along said longitudinal axis (X), said coupling device (80) being characterized in that it comprises a brake (40) which comprises a first rotational coupling member (41) intended to cooperate with a first complementary rotational coupling member (31) provided on said nut (30) in a first rotational coupling position,said brake (40) being free in longitudinal translation relative to said nut (30) in said first rotational coupling position, and which comprises a second rotational coupling member (42) intended to cooperate with a second complementary rotational coupling member (22) provided on said second rotor part (20) in a second rotational coupling position during the first rotational coupling position, said coupling device (80) further comprising a longitudinal locking element (50) which is intended to cooperate with said brake (40) and with said nut (30) to longitudinally lock said brake (40) on said nut (30) in said second rotational coupling position.,

2. Coupling device (80) according to claim 1 such that said first rotational coupling member (41) is a set of N teeth (415) distributed regularly on the circumference of said brake (40) and said first complementary rotational coupling member (31) is a set of N notches (315) distributed regularly on the circumference of said nut (30), such that in said first rotational coupling position each of said teeth (415) is housed in one of said notches (315).

3. A coupling device (80) according to claim 2 such that said second rotational coupling member (42) is a finger (425) and said second complementary rotational coupling member (22) is an assembly of P housings (225) distributed regularly on the circumference of said second rotor part (20) with P different from N, such that in said second rotational coupling position said finger (425) is housed in one of said housings (225).

4. Coupling device (80) according to claim 2 or 3 such that said brake (40) is a ring which radially covers said nut (30), said teeth (415) being arranged on the radially internal face of said brake (40) and said notches (315) being arranged on the radially external face of said nut (30).

5. Coupling device (80) according to any one of claims 1 to 4 such that in said second rotational coupling position said brake (40) is blocked in translation in one direction by said longitudinal locking element (50) and in the other direction by said second rotor part (20).

6. Coupling device (80) according to any one of claims 1 to 4 such that in said second rotational coupling position said brake (40) is blocked in translation in one direction by said longitudinal locking element (50) and in the other direction by said nut (30).

7. A coupling device (80) according to any one of claims 1 to 6 such that said longitudinal locking element (50) is a split O-ring which is housed in a groove (35) of said nut (30).

8. A coupling device (80) according to any one of claims 1 to 7 such that said first rotor part (10) is a rotor shaft and said second part (20) is a sleeve which is capable of sliding on said first part (10).

9. Coupling device (80) according to any one of claims 1 to 8 such that in said first coupling position and before said second coupling position, said brake (40) is not rotationally secured to said second part (20).

10. Coupling device (80) according to any one of claims 1 to 9 such that said turbine (1) is an aircraft turbomachine.

11. Method for coupling a first rotating part (10) of a turbine rotor (1) which is provided with a first thread (18) and a second rotating part (20) of a turbine rotor (1) which comprises a second complementary rotational coupling member (22), said turbine (1) extending along a longitudinal axis (X), said method being characterized in that it comprises the following steps: (a) a nut (30) is provided which is provided with a nut thread (38) and a first complementary rotational coupling member (31), a brake (40) which comprises a first rotational coupling member (41) and a second rotational coupling member (42), and a longitudinal locking element (50); (b) said nut (30) is secured to said first rotor part (10) by screwing said nut thread (38) onto said first thread (18) so as to lock said second rotor part (20) onto said first rotor part (10) along said longitudinal axis (X); (c) said first rotational coupling member (41) is made to cooperate with said first complementary rotational coupling member (31) by longitudinal translation of said brake (40) in order to secure said brake (40) with said nut (30) in a first rotational coupling position, said brake (40) being free in longitudinal translation relative to said nut (30); (d) after step (c), said second rotational coupling member (42) is made to cooperate with said second complementary rotational coupling member (22) by rotation of the assembly formed by said nut (30) and said brake (40) in order to secure said brake (40) with said second rotor part (20) in a second rotational coupling position; (e) said brake (40) is longitudinally locked on said nut (30) in said second rotational coupling position using said longitudinal locking element (50).

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