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EP-4735740-A1 - DEVICE FOR COUPLING TWO AIRCRAFT TURBINE ENGINE PARTS

EP4735740A1EP 4735740 A1EP4735740 A1EP 4735740A1EP-4735740-A1

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.

Inventors

  • GARIN, Fabrice Marcel Noël
  • BOISNAULT, Franck Davy

Assignees

  • SAFRAN AIRCRAFT ENGINES

Dates

Publication Date
20260506
Application Date
20240626

Claims (10)

  1. [Claim 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 block 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. [Claim 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. [Claim 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 a set of P housings (225) regularly distributed 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. [Claim 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. [Claim 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 blocking element (50) and in the other direction by said second rotor part (20).
  6. [Claim 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. [Claim 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. [Claim 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. [Claim 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. [Claim 10] Coupling device (80) according to any one of claims 1 to 9 such that said turbine (1) is an aircraft turbomachine. [Claim 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 block said second rotor part (20) on 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) to 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).

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 FIGS. 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 external 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 capable of sliding 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 FIG. 12. Thus, the locking element 140 prevents the rotation of the nut 130 relative to the first part (rotor shaft 110) by becoming secured to 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 size 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 on the circumference of the brake and the first complementary rotat