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CN-121986056-A - Nut locking system for an aircraft turbine engine

CN121986056ACN 121986056 ACN121986056 ACN 121986056ACN-121986056-A

Abstract

The invention relates to a nut locking system (100) comprising around an axis (X) a part (110) having at least one first radially oriented recess (111), a nut (120) screwed onto the part and having at least one second radially oriented recess (121), a first locking washer (130) comprising at least one first finger (131) received in the first recess, the first washer having a first face comprising radially oriented teeth and grooves, a second locking washer (140) having at least one second radial finger (141) received in the second recess, the second washer having a first face bearing against the first face of the first washer and being complementary to the first face of the first washer, one of the washers having a second face bearing on the nut.

Inventors

  • FLORIAN BENJAMIN KEVIN LACROIX
  • Jerome Paul Marceau MACE
  • Pielke Thierry Su Brent

Assignees

  • 赛峰飞机发动机公司

Dates

Publication Date
20260505
Application Date
20241003
Priority Date
20231011

Claims (15)

  1. 1. A nut locking system (100) for an aircraft turbine engine, comprising: An annular member (110) extending around an axis (X) and comprising a thread (112) around the axis and at least one first recess (111) oriented radially with respect to the axis, -A nut (120) extending around said axis (X) and adapted to be screwed onto said thread (112), said nut defining an annular housing (122) around said component and comprising at least one second recess (121) oriented radially with respect to said axis, -A first locking washer (130) extending around the axis (X) and receivable in the annular housing (122), the first locking washer comprising at least one first finger (131) oriented radially with respect to the axis (X) and receivable in the at least one first recess (111) accordingly, so as to rotationally fix the first locking washer (130) to the annular member (110), the first locking washer (130) comprising two radial bearing surfaces (132 a,132 b), a first face (132 a) of the two radial bearing surfaces comprising alternating teeth (133) and grooves (134) around the axis (X), the teeth (133) and grooves (134) of the first locking washer (130) having a radial orientation with respect to the axis (X), and -A second locking washer (140) extending around said axis (X) and receivable in said annular receiving portion (122), said second locking washer (140) comprising at least one second finger (141) oriented radially with respect to said axis (X) and receivable in said at least one second recess (121) accordingly, so as to rotationally fix said second locking washer (140) with said nut (120), said second locking washer comprising two radial bearing surfaces (142 a,142 b), a first surface (142 a) of said two radial bearing surfaces of said second locking washer being adapted to bear against a first surface (132 a) of said first washer (130) and comprising alternating teeth (143) and grooves (144) around said axis, said teeth (143) and grooves (144) of said second locking washer (140) having a radial orientation with respect to said axis (X) and complementary to said first surface (133 b) of said second washer (130), said second washer (133) and grooves (144) having complementary axial bearing surfaces (134 b) of said second washer (130).
  2. 2. The nut locking system (100) of claim 1, including a retaining ring (150) extending about said axis (X) and adapted to be received in said annular receptacle (122) and an annular groove (124) of said nut (120), said retaining ring (150) axially supporting a second face (132 b,142 b) of the other of said first and second washers (130, 140).
  3. 3. The nut locking system (100) of claim 2 wherein said second locking washer (140) has a second face (142 b) supported on said nut (120) and said first locking washer (130) has a second face (132 b) supported on said retaining ring (150).
  4. 4. A nut locking system (100) according to any one of claims 1 to 3, wherein the receptacle (122) is defined between a free end of the nut (120) and a free end of the component (110).
  5. 5. Nut locking system (100) according to any one of claims 1 to 4, wherein the teeth (133, 143) or grooves (134, 144) of each locking washer (130, 140) have a pitch (P1, P2) between each tooth (133, 143) or groove (134, 144) of less than or equal to 5 degrees, preferably less than or equal to 2 degrees, more preferably less than or equal to 1 degree, even more preferably less than or equal to 0.5 degrees.
  6. 6. The nut locking system (100) according to any one of claims 1 to 5, wherein each of said locking washers (130, 140) comprises at least two or three fingers (131, 141) distributed around said axis (X).
  7. 7. The nut locking system (100) according to any one of claims 1 to 6 wherein said teeth (133, 143) and said grooves (134, 144) extend over the entire radial extent of each of said locking washers (130, 140).
  8. 8. The nut locking system (100) according to any one of claims 1 to 7 wherein said teeth (133, 143) and said grooves (134, 144) extend over fingers (131, 141) of each of said locking washers (130, 140).
  9. 9. The nut locking system (100) according to any one of claims 1 to 8, wherein the threads (112) of the component (110) are external threads.
  10. 10. Nut locking system (100) according to any one of claims 1 to 9, comprising a rolling bearing (160) extending around the axis (X), the rolling bearing being mounted on the component (110), the rolling bearing being axially clamped between an annular shoulder (114) of the component and the nut (120), the nut being axially supported on the rolling bearing (160).
  11. 11. The nut locking system (100) according to any one of claims 1 to 10, wherein the thread (112) has a pitch of less than 5mm, preferably less than 3mm, more preferably less than 2mm, and even more preferably less than or equal to 1.5 mm.
  12. 12. Nut locking system (100) according to any one of claims 1 to 11, wherein the at least one first recess (111) of the annular member (110) is adapted to be radially aligned with the at least one second recess (121) of the nut (120) when the nut is in a tightened position.
  13. 13. The nut locking system (100) according to any one of claims 1 to 12 wherein the teeth (133, 143) and the grooves (134, 144) of each locking washer (130, 140) have a thickness of less than or equal to 0.2 mm.
  14. 14. The nut locking system (100) according to any one of claims 1 to 13, wherein the threads (112) have an average diameter of greater than or equal to 40 mm.
  15. 15. An aircraft turbine engine comprising at least one nut locking system (100) according to any one of claims 1 to 14.

Description

Nut locking system for an aircraft turbine engine Technical Field The invention relates to a nut locking system for an aircraft turbine engine. Background Generally, with reference to fig. 1, in a turbine engine such as a turbojet engine or a turboprop engine, a shaft 1 (such as a shaft 1 of a low pressure compressor) comprises an upstream cylindrical end portion 2 in the direction of the air flow in the turbine engine, which upstream cylindrical end portion is coaxially engaged in a cylindrical portion 3 of a disk 4 (such as a fan disk). The cylindrical portion 3 of the disc 4 includes internal splines 5, the internal splines 5 engaging in complementary splines 6 on the shaft 1 to rotationally fix the shaft 1 and the disc 4. The cylindrical portion 2 of the shaft comprises, near its upstream end, an external thread 7 for screwing onto a nut 8 with an internal thread. The nut 8 is screwed onto the cylindrical portion 2 of the shaft from upstream and comprises at its downstream end axial support means 9 on the disc 4 to axially clamp the disc between the nut 8 and an axial abutment 10 of the compressor shaft 1. Means are provided for locking the nut 8 relative to the shaft 1 to prevent the nut from loosening during operation. These locking means are, for example, teeth 11 extending axially from the upstream end of the nut 8 and regularly spaced about the axis of the shaft 1 so as to define a recess between each tooth 11. The shaft 1 further comprises similar teeth 12 such that the teeth 12 of the shaft 1 and the teeth 11 of the nut 8 face each other in the radial direction to enable the locking ring 13 to be fitted to the nut 8. The ring 13 comprises at least one radially external tab 14 engaged in a recess defined by two of the teeth 11 of the nut 8 and at least one radially internal tab 15 engaged in a recess defined by two of the teeth 12 of the shaft 1. The tabs 14, 15 cooperate by abutting in the circumferential direction with the teeth 11 and 12 arranged on both sides of these tabs to block the rotation of the nut 8 with respect to the shaft 1. The teeth 11 of the nut comprise an inner annular groove for receiving a split annular retaining ring 16. The ring 16 axially rests on the ring 13 and prevents its detachment from the nut 8 and the shaft 1. In the above example, the nut allows axial locking of the fan disc. In other configurations, similar fastening devices may allow for axial fixation of other annular components (e.g., guide bearings). This aspect is described in particular in the documents FR-B1-2 857 708, FR-B1-2 929 358, FR-B1-3 013 388 or FR-B1-3 093 538. Other nut locking systems are also described in US-A1-2007/052287, US-A1-2022/042460, US-A1-2016/298548 and US-A1-2020/200209. In practice, it has been found that the locking accuracy of the nut has an effect on the load to which the axial locking member, in particular a guide bearing such as a rolling bearing, is subjected. It is a further object of the present invention to provide an improved nut locking system solution. Disclosure of Invention Accordingly, a nut locking system for an aircraft turbine engine is proposed, comprising: an annular member extending about an axis and comprising a thread about the axis and at least one first recess oriented radially with respect to the axis, A nut extending about an axis and being capable of being screwed onto a thread, the nut defining an annular housing around the component and comprising at least one second recess oriented radially with respect to the axis, A first locking washer extending around the axis and adapted to be received in the annular receiving portion, the first locking washer comprising at least one first finger oriented radially with respect to the axis and adapted to be received in the at least one first recess, respectively, so as to rotationally fix the first washer with the annular member, the first locking washer comprising two radial bearing surfaces, a first of the two radial bearing surfaces of the first locking washer comprising alternating teeth and grooves around the axis, the teeth and grooves of the first washer having a radial orientation with respect to the axis, -A second annular locking washer extending around the axis and receivable in the annular receiving portion, the second locking washer comprising at least one second finger oriented radially with respect to the axis and receivable in the at least one second recess respectively for rotationally fixing the second washer to the nut, the second locking washer comprising two radial bearing surfaces, a first of the two radial bearing surfaces of the second locking washer being supportable against the first face of the first washer and comprising alternating teeth and grooves around the axis, the teeth and grooves of the second washer having a radial orientation with respect to the axis and complementary to the teeth and grooves of the first washer, one of the first washer and the second washer having a second