EP3312384A1 - Rotary assembly of a turbine engine provided with a system for axial retention of a blade - Google Patents

Rotary assembly of a turbine engine provided with a system for axial retention of a blade Download PDF

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Publication number
EP3312384A1
EP3312384A1 EP17197598.0A EP17197598A EP3312384A1 EP 3312384 A1 EP3312384 A1 EP 3312384A1 EP 17197598 A EP17197598 A EP 17197598A EP 3312384 A1 EP3312384 A1 EP 3312384A1
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EP
European Patent Office
Prior art keywords
teeth
disc
disk
latch
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17197598.0A
Other languages
German (de)
French (fr)
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EP3312384B1 (en
Inventor
Thomas Alain DE GAILLARD
Alexandre Bernard Marie Boisson
Gilles Pierre-Marie NOTARIANNI
Charles-Henri Claude Jacky SULLET
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
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Safran Aircraft Engines SAS
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Publication date
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Publication of EP3312384A1 publication Critical patent/EP3312384A1/en
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Publication of EP3312384B1 publication Critical patent/EP3312384B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/36—Application in turbines specially adapted for the fan of turbofan engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position

Definitions

  • the present invention relates to a rotary assembly of a turbomachine provided with a system for axially holding one or more of its blades, in particular blades of a rotor disc of a turbojet engine.
  • Such a rotary assembly generally comprises one or more rotors whose disc is connected to a rotor rotation shaft, which rotor disc has at its periphery a circumferential alternation of cells, also called grooves, and teeth, of substantially axial orientations, that is to say which extend in a direction parallel to the axis of the rotor shaft.
  • the rotor disc is provided with a plurality of vanes partially inserted in grooves and extend radially from the periphery of the disc, in a vein of fluid supplying the turbomachine.
  • the blades of the fan extend radially in a vein up to the inner wall of a fan casing connected to an annular pod to externally delimit the vein.
  • axial refers to the axis of rotation (longitudinal) of the rotor.
  • radial refers to a radius of the rotor disk, the latter extending by definition orthogonal to the axis of rotation of the rotor.
  • circumferential refers to the circumference of the rotor disk, and corresponds to the rotational path of the rotor disk.
  • upstream corresponds to a zone of origin of the fluid that passes through the turbomachine in operation
  • downstream corresponds to a departure zone of this fluid.
  • the fluid passes through the turbomachine, and in particular the rotor disc, from upstream to downstream.
  • the blades each have at their end a foot engaged axially in the grooves of the disc and retained radially by the teeth of the disc.
  • a wedge is typically inserted between each blade root and the bottom of the groove corresponding, for purposes of maintenance, a priori prestressing, these elements.
  • the blades are secured and retained upstream including an upstream cone connected to the disk. This cone constitutes the internal and upstream limit of the vein of gas circulation of the turbomachine.
  • the turbojet engine further comprises an upstream ferrule integral with the disk and the upstream cone, and located between the disk and the upstream cone along the axis of the turbomachine. The ferrule thus makes it possible to connect the upstream cone to the disk.
  • a lock can conventionally be provided to axially secure the blades in their grooves.
  • the lock is positioned in slots provided for this purpose in the teeth of the disk, the lock being in correspondence of a groove of the disk in which has been previously inserted the dawn foot.
  • the lock is immobilized via the upstream ferrule fixed on the disc, this ferrule axially blocking a shim interposed between each blade root and the bottom of the corresponding groove.
  • the latch is inserted into its slots by radial translation directed towards the outside of the disc.
  • the document US6634863 describes a lock of this type inserted into a groove. It more precisely describes a turbine engine assembly comprising a disk whose vanes are held axially by a retaining element (latch) inserted in a recess provided in the inner wall of the disc teeth, and extending perpendicular to the axis of the disc. groove welcoming the foot of dawn.
  • the retaining element is coupled to a spacing element positioned in the groove, resting on the lower surface of said groove, and prevents the blades from pivoting on themselves in the groove.
  • the need to provide such a space generates constraints for the manufacture of the rotor disk, and more particularly the placement constraints of the fastener element for connecting the disk to the upstream shell, the latter connecting the disk and upstream cone.
  • the fastening element for connecting the ferrule to the disc must necessarily be positioned under the space reserved for the radial displacement of the lock (that is to say, even closer to the center of the disc).
  • the radial space required for the insertion or removal of the latch by radial translation is unfavorable to reduce the diameter of the disc to its free end upstream at its teeth, to the detriment of the freedom of choice of the aerodynamic profile and the diameter of the upstream ferrule and the upstream cone.
  • the purpose of the invention is therefore to overcome the disadvantages of the prior art by proposing a rotary turbine engine assembly provided with an axial retention system of a blade, such a holding system comprising a latch closing the opening of the engine. a groove in which is inserted a blade, and whose establishment and / or withdrawal is not achieved by a radial translation of said lock in particular in / out of a notch provided for this purpose.
  • the holding system according to the invention must also, and therefore, make it possible to use the space usually provided to allow the insertion or withdrawal of the lock in its slot, in order to reduce certain manufacturing constraints of the disk, and particular manufacturing constraints related to the placement on the disc of the fastening between the ferrule and the disc.
  • another object of the invention is to provide a rotating turbomachine assembly provided with the previous holding system, wherein the attachment of the ferrule to the disc is positioned in the space usually required for insertion or removal. of the lock, so that the ferrule-disk attachment is positioned higher on the disk pin, at the periphery of the disk, that is to say more radially away from the center of the rotor disk.
  • Another object of the invention is to propose a turbojet engine comprising such a rotary assembly.
  • the invention also aims to propose a method of mounting the previous holding system to a rotating assembly of a turbomachine for axially holding one or more of its blades.
  • Another object of the invention relates to a turbomachine comprising one or more rotary assembly (s) comprising at least one axial retention system of a blade of the rotor disk described above.
  • the invention relates to a rotary assembly of a turbomachine, and in particular a turbojet, provided with a system for axially holding at least one blade of a rotor disk.
  • a disk of a blower of a turbojet engine said fan being positioned upstream of a compressor module, or a compressor stage, for example, with vanes reported on the disk.
  • turbomachine any type of turbomachine, and in particular to a turbojet, the latter being in particular simple flow or double flow.
  • turbojets are well known to those skilled in the art and therefore will not be detailed further in this text.
  • the rotor disk 1 is rotated about a longitudinal axis A by a fan shaft.
  • the disc comprises at its outer periphery a circumferential alternation of teeth 10 and grooves 20 which extend axially, that is to say in a direction substantially parallel to the axis A of the disc.
  • Blades 30 (shown on the Figures 2A, 2B, 2C ), whose feet 31 are adapted to be engaged axially in the grooves 20 of the disk and retained radially by the teeth 10, extend radially around the disk.
  • Plates 45 are generally provided on the disc 1, and extend circumferentially between each pair of adjacent blades.
  • the rotor disk 1 is of the pin-shaped type 2, in that it comprises a pin 2 of said disk having a curved profile at the head of the pin that moves radially away from the axis of the disk upstream .
  • This curved profile at the head of the pin is a substantially C-shaped profile comprising an outer axial branch which delimits the teeth 10 of the disc, an inner branch which extends at least on a component substantially axially closer to the motor axis. the outer branch, and a radially-connected connecting front branch, which conventionally comprises an advance 40.
  • the fastening element 41 of the ferrule 43 is generally in the form of a hook provided with an orifice 42 enabling the ferrule 43 to be fixed to the disk pin 2 1 by screwing.
  • the ferrule 43 is connected further upstream to an upstream cone 44 forming the internal and upstream boundary of a fluid circulation vein of the turbomachine.
  • FIGS. 2A, 2B, and 2C illustrate a portion of a rotary assembly, centered on a groove 20 of the disc 1, a blade 30 inserted in the groove 20 is held axially by the holding system according to the invention, and the mounting of such a system of maintaining on the upstream face of the rotor disc 1.
  • the holding system according to the invention, and the mounting of such a system of maintaining on the upstream face of the rotor disc 1.
  • axial retention means that the blade is immobilized axially thanks to the holding system, and that any displacement along the longitudinal axis A of the rotor disk is therefore made impossible.
  • a blade 30 is mounted on the rotor disc 1 by inserting its foot 31 into the corresponding groove 20 of the disc.
  • the groove has a flared shape, and is limited circumferentially by two consecutive teeth 10 of the disc. It extends axially along the rotor disc, and comprises a bottom 21, bordered by two edges 22 common with the teeth 10, and an opening 23 which constitutes the upstream axial end of the groove 20 and whose bottom 21 is located in the vicinity of the disk pin 2.
  • the blade root 31 has a flared shape substantially corresponding to the shape of the groove 20 into which it is inserted. It is formed by two sides 32 which extend axially facing the borders 22 of the groove 20, by an upstream front 33 connecting the two sides 32, and a base 34 which extends axially, facing the bottom 21 of the groove.
  • the blade root 31 is mounted in the groove so that its upstream edge 33 is located in the plane P of the rotor disk 1, orthogonal to the axis A of the disk, and containing the ends 13 of the teeth 10. In other words, the upstream front 33 of the blade root 31 and the ends 13 of the teeth 10 have substantially the same axial position.
  • a tooth 10 extends axially along the outer periphery of the disc 1 and comprises two side edges 11 common to the borders of the grooves 20 which it defines.
  • the edges 20 of the tooth are connected by an upper face 12 and terminate axially by an end 13.
  • the opening 23 of the groove is bordered by the ends 13 of the teeth 10.
  • the front 33 upstream of the foot dawn, the opening 23 of the groove, and the ends 13 of the teeth are located in the plane P of the rotor disk 1.
  • the ends 13 are upstream axial ends in the form of a surface on which the holding system is mountable in accordance with the following.
  • the teeth 10 advantageously comprise grooves 14 which extend along their upper face 12, serving to accommodate platforms 45. It will be understood that such grooves are optional, as well as the platforms they accommodate.
  • the latch 501 of the holding system is pressed against the ends 13 of the teeth of the disk 1 so as to close the opening 23 of the groove. In doing so, the lock 501 bears against the upstream front 33 of the blade root 31. The lock thus prevents the blade root from emerging from the groove through the opening by axial displacement. Note that the closure of the opening 23 by the latch 501 is at least partial, and must be sufficient to prohibit the crossing of the opening by the blade root.
  • the latch 501 is in the form of a part comprising a central portion 511 of which extend the edges 521.
  • the central portion 511 of the lock closes the opening 23 of the groove 20 and abuts against the upstream front 33 of the blade root, and the edges 521 of the lock bear against the ends 13 of the teeth 10.
  • removable parts 502 are mounted at the ends 13 of the teeth, bearing against the latch 501, to lock said latch.
  • the removable parts 502 are therefore the new ends of the teeth on which they are mounted.
  • the removable parts 502 project from the rotor disc 1.
  • the pieces are said to be “removable” in that they can be separated from the ends of the teeth or fixed to said ends of the teeth, by any means provided for this purpose.
  • the lock is said to be “locked” in that it is held stationary, clamped between the ends of the teeth and the removable parts.
  • the edges 521 of the lock 501 bear against both the ends 13 of the teeth, on the downstream surface side of the lock, and against the removable parts 502, on the upstream surface side of the lock.
  • the blade 30 is held axially, in position in its groove 20, by the holding system according to the invention.
  • the shape (or section) of the lock is not limited to the substantially pentagonal shape shown on the Figures 2B and 2C .
  • the shape and the dimensions of the lock will advantageously be chosen so as to allow a total closure of the opening 23 of the groove 20. It will be particularly ensured that the edges 521 of the lock are sufficiently pronounced in order to obtain a satisfactory stop and stable edges of the latch against the ends 13 of the teeth, so as to prevent the latch from pivoting or tilting on itself, and accidentally detaches from the disk 1.
  • the lock may optionally include a spout 541 to facilitate its gripping by a user and thus facilitating its introduction or removal, and may be provided with an orifice 551 to fix it to an underlying shim 60 described in the after.
  • a removable piece 502 when a removable piece 502 is mounted at the end 13 of a tooth, it completely eclipses said end of the tooth. More preferably, the shape (or section) of a removable piece corresponds to the shape of the end of the tooth on which it is mounted, so as to extend the tooth continuously.
  • the removable part 502 comprises in particular grooves 552 corresponding to those of the teeth 10.
  • the removable part 502 once mounted on one end 13 of a tooth 10, bears against said end 13 of the tooth.
  • the removable part 502 comprises two lateral edges 522, and a central portion 512 projecting on the downstream surface of the part, so as to form side recesses 532.
  • the central portion 512 of each removable piece bears against the end 13 of the corresponding tooth, and the lateral recesses 532 of the removable parts 502 abut against the edges 521 of the lock 501.
  • a shim 60 is inserted into the groove 20, between the bottom 21 of the groove and the base 34 of the root of the blade.
  • the shim 60 is located under the lock, that is to say between the periphery of the disk and the lock.
  • the wedge 60 makes it possible to exert a force directed radially towards the outside of the disc on the blade root 31, thus pushing the sides 32 of the blade root against the lateral edges 22 of the groove, which limits the movement of the blade. dawn with respect to the disk, and particularly the radial displacement of the blade and the rotation of the blade around the axis of its foot (circumferential movement).
  • the shim 60 may be provided with an orifice in order to be fixed to the spout 541 of the lock 501 by means of an orifice 551, by means of a rod for example.
  • the removable parts 502 and the ends 13 of the teeth advantageously comprise attachment means for connecting said removable parts to said ends of the teeth.
  • the attachment means respectively comprise a first axial orifice 542 provided on the removable parts 520 and a second axial orifice 15 provided in the ends 13 of the teeth.
  • the teeth 10 may further comprise a third orifice 16 on their upper face 12, in the vicinity of their end 13, said third orifice 16 being orthogonal to the second orifice 15, opening on the second orifice, and being adapted to for example, to receive a barrel nut.
  • a holding system adapted to prohibit the rotation of the removable parts 502 about the axis of the rod inserted in the orifice 542 which connects them to the end 13 of the teeth.
  • Any known means of angular indexing allowing to prohibit the rotation of the removable parts 502 can be envisaged. It is for example two additional orifices arranged respectively in the removable parts and in the ends of the teeth, parallel to the first orifice 542 and at the second port 15 above, and a rod housed in said additional holes. It may also be a pin or an indexing finger adapted to be housed in said additional holes.
  • the removable parts may also comprise a shoulder bearing against the upper face 12 of the teeth 10.
  • An advantage of the holding system according to the invention is that it makes it possible to use the space located at the periphery of the disk, on the disk pin 2 when the latter is of pin-shaped type, usually necessary for the inserting or removing the latch at the opening 23 of the groove 20.
  • the holding system makes it possible to relax the dimensioning constraints related to the positioning of the fixing element 41 of the ferrule on the disk 1 provided on the end 40 of the disk pin 2.
  • the ferrule-disk attachment element 41, and by extension the advanced 40 can indeed be positioned higher on the pin of the disk, at the periphery of the disk, that is to say be more distant from the center of the disc, as shown in arrow 46 of Figure 4 .
  • the advance 40 comprises a fixing element 41 which is advantageously in the form of a hook and which is provided with a hole 42 for fixing the ferrule to the disc 1.
  • the arrow 46 indicates that the hook of the fastener 41 is positioned higher on the disc pin 2, it is that is, more radially away from the center of the disc, compared to the existing one.
  • the holding system according to the invention thus makes it possible to reduce the overhang of the ferrule (or the "clearance” of the ferrule ") which corresponds to the part D of ferrule which extends from the fastening element. 41 (from advanced 40) to its outer periphery (on the Figure 4 it is the "high” part of the ferrule). This reduces the torque between the attachment of the shell and the outer periphery of the shell.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

La présente invention concerne un ensemble rotatif de turbomachine, comprenant une pluralité d'aubes (30) présentant des pieds (31) positionnés dans les rainures (20) d'un disque de rotor et un système de maintien axial desdites aubes (30). Le système de maintien axial comprend un verrou (501) amovible monté en appui contre les extrémités axiales amont (13) de deux dents (10) consécutives du disque (1) de manière à obturer l'ouverture (23) de la rainure (20) formée par lesdites dents (10). Il comporte des pièces amovibles (502) adaptées pour être montées aux extrémités axiales amont (13) des dents (10) et pour bloquer le verrou (501) par serrage dudit verrou entre lesdites pièces amovibles (502) et les dents (10) une fois le verrou mis en place contre les extrémités axiales amont (13) des dents (10).

Figure imgaf001
The present invention relates to a rotary turbine engine assembly, comprising a plurality of blades (30) having feet (31) positioned in the grooves (20) of a rotor disk and a system for axially holding said vanes (30). The axial retention system comprises a detachable latch (501) mounted in abutment against the upstream axial ends (13) of two consecutive teeth (10) of the disk (1) so as to close the opening (23) of the groove (20). ) formed by said teeth (10). It comprises removable parts (502) adapted to be mounted at the upstream axial ends (13) of the teeth (10) and to lock the latch (501) by clamping said latch between said removable parts (502) and the teeth (10) a once the lock is in place against the upstream axial ends (13) of the teeth (10).
Figure imgaf001

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

La présente invention concerne un ensemble rotatif d'une turbomachine muni d'un système de maintien axial d'une ou plusieurs de ses aubes, en particulier des aubes d'un disque de rotor d'un turboréacteur.The present invention relates to a rotary assembly of a turbomachine provided with a system for axially holding one or more of its blades, in particular blades of a rotor disc of a turbojet engine.

ETAT DE LA TECHNIQUESTATE OF THE ART

La structure générale d'un ensemble rotatif d'une turbomachine dans le domaine de l'aéronautique est bien connue de l'homme du métier.The general structure of a rotary assembly of a turbomachine in the field of aeronautics is well known to those skilled in the art.

Un tel ensemble rotatif comprend de manière générale un ou plusieurs rotors dont le disque est relié à un arbre de rotation du rotor, lequel disque de rotor possède à sa périphérie une alternance circonférentielle d'alvéoles, appelées également rainures, et de dents, d'orientations sensiblement axiales, c'est-à-dire qui s'étendent dans une direction parallèle à l'axe de l'arbre du rotor.Such a rotary assembly generally comprises one or more rotors whose disc is connected to a rotor rotation shaft, which rotor disc has at its periphery a circumferential alternation of cells, also called grooves, and teeth, of substantially axial orientations, that is to say which extend in a direction parallel to the axis of the rotor shaft.

Le disque de rotor est muni d'une pluralité d'aubes partiellement insérées dans des rainures et s'étendent radialement, depuis la périphérie du disque, dans une veine de fluide alimentant la turbomachine.The rotor disc is provided with a plurality of vanes partially inserted in grooves and extend radially from the periphery of the disc, in a vein of fluid supplying the turbomachine.

Dans le cas particulier d'un ensemble rotatif d'une soufflante, les aubes de la soufflante s'étendent radialement dans une veine allant jusqu'à la paroi interne d'un carter de soufflante raccordé à une nacelle annulaire pour délimiter extérieurement cette veine.In the particular case of a rotary assembly of a fan, the blades of the fan extend radially in a vein up to the inner wall of a fan casing connected to an annular pod to externally delimit the vein.

On précise que le terme « axial » se rapporte à l'axe de rotation (longitudinal) du rotor. Le terme « radial » fait référence à un rayon du disque de rotor, ce dernier s'étendant par définition de manière orthogonale à l'axe de rotation du rotor. Le terme « circonférentiel » fait référence à la circonférence du disque de rotor, et correspond au chemin rotationnel du disque de rotor.It is specified that the term "axial" refers to the axis of rotation (longitudinal) of the rotor. The term "radial" refers to a radius of the rotor disk, the latter extending by definition orthogonal to the axis of rotation of the rotor. The term "circumferential" refers to the circumference of the rotor disk, and corresponds to the rotational path of the rotor disk.

On précise également que le terme « amont » (AM) correspond à une zone de provenance du fluide qui traverse la turbomachine en fonctionnement, et que le terme « aval » (AV) correspond à une zone de partance de ce fluide. Ainsi, le fluide traverse la turbomachine, et en particulier le disque de rotor, depuis l'amont vers l'aval.It is also specified that the term "upstream" (AM) corresponds to a zone of origin of the fluid that passes through the turbomachine in operation, and that the term "downstream" (AV) corresponds to a departure zone of this fluid. Thus, the fluid passes through the turbomachine, and in particular the rotor disc, from upstream to downstream.

Par ailleurs, en vue de leur maintien, les aubes possèdent chacune à leur extrémité un pied engagé axialement dans les rainures du disque et retenu radialement par les dents du disque. Une cale est typiquement intercalée entre chaque pied d'aube et le fond de la rainure correspondant, à des fins de maintien, a priori en précontrainte, de ces éléments. Les aubes sont sécurisées et retenues en amont notamment par un cône amont relié au disque. Ce cône constitue la limite interne et amont de la veine de circulation des gaz de la turbomachine. Le turboréacteur comprend en outre une virole amont, solidaire du disque et du cône amont, et située entre le disque et le cône amont selon l'axe de la turbomachine. La virole permet ainsi de relier le cône amont au disque.Moreover, in order to maintain them, the blades each have at their end a foot engaged axially in the grooves of the disc and retained radially by the teeth of the disc. A wedge is typically inserted between each blade root and the bottom of the groove corresponding, for purposes of maintenance, a priori prestressing, these elements. The blades are secured and retained upstream including an upstream cone connected to the disk. This cone constitutes the internal and upstream limit of the vein of gas circulation of the turbomachine. The turbojet engine further comprises an upstream ferrule integral with the disk and the upstream cone, and located between the disk and the upstream cone along the axis of the turbomachine. The ferrule thus makes it possible to connect the upstream cone to the disk.

De manière générale, un verrou peut classiquement être prévu afin de sécuriser axialement les aubes dans leurs rainures. En référence au document FR2974864 , illustrant l'état de l'art pour le montage d'un tel verrou, le verrou est positionné dans des fentes prévues à cet effet dans les dents du disque, le verrou étant en correspondance d'une rainure du disque dans lequel a été préalablement inséré le pied d'aube. Conformément au mode de réalisation de la figure 4 et de la figure 5 de ce document, le verrou est immobilisé via la virole amont fixée sur le disque, cette virole bloquant axialement une cale intercalée entre chaque pied d'aube et le fond de la rainure correspondant. Le verrou est inséré dans ses fentes par translation radiale orientée vers l'extérieur du disque.In general, a lock can conventionally be provided to axially secure the blades in their grooves. With reference to the document FR2974864 , illustrating the state of the art for mounting such a lock, the lock is positioned in slots provided for this purpose in the teeth of the disk, the lock being in correspondence of a groove of the disk in which has been previously inserted the dawn foot. In accordance with the embodiment of the figure 4 and of FIG. 5 of this document, the lock is immobilized via the upstream ferrule fixed on the disc, this ferrule axially blocking a shim interposed between each blade root and the bottom of the corresponding groove. The latch is inserted into its slots by radial translation directed towards the outside of the disc.

Le document US6634863 décrit un verrou de ce type inséré dans une rainure. Il décrit plus précisément un ensemble de turbomoteur comprenant un disque dont les aubes sont maintenues axialement par un élément de retenu (verrou) inséré dans un logement prévu dans la paroi interne des dents du disque, et s'étendant perpendiculairement à l'axe de la rainure accueillant le pied de l'aube. L'élément de retenu est couplé à un élément d'espacement positionné dans la rainure, en appui sur la surface inférieure de ladite rainure, et permet d'éviter que les aubes ne pivotent sur elles-mêmes dans la rainure.The document US6634863 describes a lock of this type inserted into a groove. It more precisely describes a turbine engine assembly comprising a disk whose vanes are held axially by a retaining element (latch) inserted in a recess provided in the inner wall of the disc teeth, and extending perpendicular to the axis of the disc. groove welcoming the foot of dawn. The retaining element is coupled to a spacing element positioned in the groove, resting on the lower surface of said groove, and prevents the blades from pivoting on themselves in the groove.

De ce qui précède, on comprend qu'il est nécessaire de réserver un espace radial au niveau de l'épingle de disque du rotor, c'est-à-dire au niveau de sa partie externe, de manière à permettre l'insertion ou le retrait du verrou dans son encoche par translation radiale, tel que décrit précédemment. Cet espace est situé sous le verrou, c'est-à-dire plus proche du centre du disque, lorsque ledit verrou est en place dans son encoche.From the above, it is understood that it is necessary to reserve a radial space at the rotor disk pin, that is to say at its outer portion, so as to allow the insertion or removing the latch in its notch by radial translation, as described above. This space is located under the lock, that is to say closer to the center of the disk, when said lock is in place in its notch.

Or la nécessité de prévoir un tel espace engendre des contraintes de fabrication du disque de rotor, et tout particulièrement des contraintes de placement de l'élément de fixation permettant de relier le disque à la virole amont, cette dernière reliant le disque et cône amont. En effet, l'élément de fixation permettant de relier la virole au disque doit nécessairement être positionné sous l'espace réservé au déplacement radial du verrou (c'est-à-dire encore plus proche du centre du disque). Par ailleurs, l'espace radial nécessaire à l'insertion ou au retrait du verrou par translation radiale est défavorable pour réduire le diamètre du disque à son extrémité libre amont au niveau de ses dents, au détriment de la liberté de choix du profil aérodynamique et du diamètre de la virole amont et du cône amont.However, the need to provide such a space generates constraints for the manufacture of the rotor disk, and more particularly the placement constraints of the fastener element for connecting the disk to the upstream shell, the latter connecting the disk and upstream cone. Indeed, the fastening element for connecting the ferrule to the disc must necessarily be positioned under the space reserved for the radial displacement of the lock (that is to say, even closer to the center of the disc). Furthermore, the radial space required for the insertion or removal of the latch by radial translation is unfavorable to reduce the diameter of the disc to its free end upstream at its teeth, to the detriment of the freedom of choice of the aerodynamic profile and the diameter of the upstream ferrule and the upstream cone.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

L'invention a donc pour but de remédier aux inconvénients de l'art antérieur en proposant un ensemble rotatif de turbomachine muni d'un système de maintien axial d'une aube, un tel système de maintien comprenant un verrou venant obturer l'ouverture d'une rainure dans laquelle est insérée une aube, et dont la mise en place et/ou le retrait n'est pas réalisé par une translation radiale dudit verrou notamment dans/hors d'une encoche prévue à cet effet.The purpose of the invention is therefore to overcome the disadvantages of the prior art by proposing a rotary turbine engine assembly provided with an axial retention system of a blade, such a holding system comprising a latch closing the opening of the engine. a groove in which is inserted a blade, and whose establishment and / or withdrawal is not achieved by a radial translation of said lock in particular in / out of a notch provided for this purpose.

Le système de maintien selon l'invention doit également, et par conséquent, permettre de rendre utilisable l'espace prévu habituellement pour permettre l'insertion ou le retrait du verrou dans son encoche, afin de réduire certaines contraintes de fabrication du disque, et en particulier les contraintes de fabrication liées au placement sur le disque de la fixation entre la virole et le disque.The holding system according to the invention must also, and therefore, make it possible to use the space usually provided to allow the insertion or withdrawal of the lock in its slot, in order to reduce certain manufacturing constraints of the disk, and particular manufacturing constraints related to the placement on the disc of the fastening between the ferrule and the disc.

À cette fin, un autre but de l'invention est de proposer un ensemble rotatif de turbomachine muni du système de maintien précédent, dans lequel la fixation de la virole au disque est positionnée dans l'espace habituellement nécessaire à l'insertion ou au retrait du verrou, de sorte que la fixation virole-disque est positionnée plus haut sur l'épingle de disque, au niveau de la périphérie du disque, c'est-à-dire plus éloignée radialement du centre du disque de rotor.To this end, another object of the invention is to provide a rotating turbomachine assembly provided with the previous holding system, wherein the attachment of the ferrule to the disc is positioned in the space usually required for insertion or removal. of the lock, so that the ferrule-disk attachment is positioned higher on the disk pin, at the periphery of the disk, that is to say more radially away from the center of the rotor disk.

La mise en place et le retrait du système de maintien doivent avantageusement être réalisés rapidement et simplement.The establishment and removal of the holding system must advantageously be carried out quickly and simply.

Un autre but de l'invention est de proposer un turboréacteur comprenant un tel ensemble rotatif.Another object of the invention is to propose a turbojet engine comprising such a rotary assembly.

L'invention vise également à proposer un procédé de montage du système de maintien précédent à un ensemble rotatif d'une turbomachine pour maintenir axialement une ou plusieurs de ses aubes.The invention also aims to propose a method of mounting the previous holding system to a rotating assembly of a turbomachine for axially holding one or more of its blades.

À cette fin, l'invention concerne un ensemble rotatif de turbomachine, comprenant :

  • un disque de rotor comprenant circonférentiellement une alternance de dents et de rainures périphériques, lesdites rainures étant munies d'une ouverture bordée par les extrémités des dents,
  • une pluralité d'aubes présentant des pieds positionnés dans les rainures, l'ensemble rotatif de turbomachine comprenant en outre au moins un système de maintien axial desdites aubes, et étant principalement caractérisé en ce que le système de maintien axial comprend un verrou amovible monté en appui contre les extrémités axiales amont de deux dents consécutives du disque de manière à obturer l'ouverture de la rainure formée par lesdites dents, et en ce que ledit système de maintien axial comporte des pièces amovibles adaptées pour être montées aux extrémités axiales amont des dents et pour bloquer le verrou par serrage dudit verrou entre lesdites pièces amovibles et les dents une fois le verrou mis en place contre les extrémités axiales amont des dents.
To this end, the invention relates to a rotating turbomachine assembly, comprising:
  • a rotor disc circumferentially comprising an alternation of teeth and peripheral grooves, said grooves being provided with an opening bordered by the ends of the teeth,
  • a plurality of blades having feet positioned in the grooves, the rotary turbine engine assembly further comprising at least one system for axially holding said blades, and being mainly characterized in that the holding system axial comprises a removable latch mounted in abutment against the upstream axial ends of two consecutive teeth of the disk so as to close the opening of the groove formed by said teeth, and in that said axial retention system comprises removable parts adapted to be mounted at the upstream axial ends of the teeth and for locking the latch by clamping said latch between said removable parts and the teeth once the latch is in place against the upstream axial ends of the teeth.

De manière optionnelle, l'ensemble rotatif selon l'invention peut comprendre les caractéristiques suivantes :

  • les pièces amovibles ont une forme correspondant à la forme des extrémités des dents sur lesquelles elles sont montées, de manière à prolonger les dents de manière continue ;
  • les pièces amovibles sont montées aux extrémités des dents par vissage ;
  • le verrou amovible se présente sous la forme d'une pièce présentant une partie centrale obturant l'ouverture de la rainure, et des bords latéraux destinés à être enserrés par les extrémités des dents et les pièces amovibles ;
  • le disque de rotor étant du type à forme en épingle, en ce qu'il comprend une épingle dudit disque présentant un profil recourbé en tête d'épingle qui s'éloigne radialement de l'axe du disque vers l'amont, les pièces amovibles font saillie du disque de rotor et sont à l'aplomb d'une avancée de l'épingle de disque. Ce profil recourbé en tête d'épingle est un profil sensiblement en forme de C comprenant une branche axiale extérieure qui délimite les dents du disque, une branche intérieure qui s'étend au moins sur une composante sensiblement axialement plus proche de l'axe moteur que la branche extérieure, et une branche frontale de raccordement à composante radiale, qui comprend de manière classique ladite avancée ;
  • l'épingle de disque est munie à son avancée d'un élément de fixation d'une virole au disque, de préférence se présentant sous la forme d'un crochet, de sorte que le verrou est monté à l'aplomb de l'élément de fixation de la virole au disque ;
  • de manière avantageuse, entre l'avancée de l'épingle de disque et les dents, l'épingle de disque est dépourvue d'espace d'insertion et/ou de retrait du verrou ;
  • l'ensemble rotatif comprend en outre une cale destinée à être positionnée dans la rainure, entre le fond de la rainure et le pied d'aube, de manière à maintenir les côtés du pied d'aube en appui contre les bordures de la rainure.
Optionally, the rotary assembly according to the invention can comprise the following characteristics:
  • the removable parts have a shape corresponding to the shape of the ends of the teeth on which they are mounted, so as to extend the teeth continuously;
  • the removable parts are mounted to the ends of the teeth by screwing;
  • the removable lock is in the form of a part having a central portion closing the opening of the groove, and side edges intended to be gripped by the ends of the teeth and the removable parts;
  • the rotor disk being of the pin-shaped type, in that it comprises a pin of said disk having a curved profile at the head of the pin which moves radially away from the axis of the disk upstream, the removable parts protrude from the rotor disk and are in line with an advance of the disk pin. This curved profile at the head of the pin is a substantially C-shaped profile comprising an outer axial branch which delimits the teeth of the disc, an inner branch which extends at least on a component substantially axially closer to the motor axis than the outer branch, and a radially-connected front branch of connection, which conventionally comprises said step;
  • the disc pin is provided in its advance with a fastener element of a ferrule to the disc, preferably in the form of a hook, so that the lock is mounted at the base of the element fastening the ferrule to the disc;
  • advantageously, between the advance of the disc pin and the teeth, the disc pin is devoid of insertion space and / or withdrawal of the lock;
  • the rotary assembly further comprises a wedge intended to be positioned in the groove, between the bottom of the groove and the blade root, so as to maintain the sides of the blade root bearing against the edges of the groove.

Un autre objet de l'invention concerne une turbomachine comprenant un ou plusieurs ensemble(s) rotatif(s) comprenant au moins un système de maintien axial d'une aube du disque de rotor décrit précédemment.Another object of the invention relates to a turbomachine comprising one or more rotary assembly (s) comprising at least one axial retention system of a blade of the rotor disk described above.

Un autre objet de l'invention concerne un procédé de montage d'un système de maintien axial d'une aube sur un ensemble rotatif de turbomachine tel que décrit précédemment, l'ensemble rotatif comprenant un disque de rotor muni circonférentiellement d'une alternance de dents et de rainures périphériques, lesdites rainures étant munies d'une ouverture bordée par les extrémités des dents, et au moins une aube dont le pied est inséré dans une rainure, le procédé de montage étant principalement caractérisé en ce qu'il comprend :

  • le montage d'un verrou en appui contre les extrémités des dents, de manière à obturer l'ouverture de la rainure,
  • le montage des pièces amovibles aux extrémités des dents afin de bloquer le verrou par serrage dudit verrou entre lesdites pièces amovibles et les dents.
Another object of the invention relates to a method of mounting an axial retention system of a blade on a rotary turbine engine assembly as described above, the rotary assembly comprising a rotor disc circumferentially provided with an alternation of teeth and peripheral grooves, said grooves being provided with an opening bordered by the ends of the teeth, and at least one blade whose foot is inserted into a groove, the mounting method being mainly characterized in that it comprises:
  • mounting a lock bearing against the ends of the teeth, so as to close the opening of the groove,
  • mounting the removable parts at the ends of the teeth to lock the lock by clamping said lock between said removable parts and the teeth.

D'autres avantages et caractéristiques de l'invention apparaîtront à la lecture de la description suivante donnée à titre d'exemple illustratif et non limitatif, en référence aux Figures annexées qui représentent :

  • La Figure 1, une vue en perspective d'un disque de rotor ;
  • Les Figures 2A, 2B, et 2C illustrant le montage du système de maintien axial d'une aube, selon l'invention ;
  • La Figure 3, une vue en perspective d'une pièce amovible du système de maintien axial d'une aube, selon l'invention ;
  • La Figure 4, une vue en coupe d'un disque de rotor illustrant un avantage de l'invention se traduisant par une remontée de la fixation de la virole sur l'épingle du disque de rotor.
Other advantages and characteristics of the invention will appear on reading the following description given by way of illustrative and nonlimiting example, with reference to the appended figures which represent:
  • The Figure 1 a perspective view of a rotor disc;
  • The Figures 2A, 2B, and 2C illustrating the mounting of the axial retention system of a blade, according to the invention;
  • The Figure 3 , a perspective view of a removable part of the axial retention system of a blade, according to the invention;
  • The Figure 4 , a sectional view of a rotor disk illustrating an advantage of the invention resulting in a rise in the attachment of the ferrule on the pin of the rotor disc.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

L'invention concerne un ensemble rotatif d'une turbomachine, et en particulier d'un turboréacteur, muni d'un système de maintien axial d'au moins une aube d'un disque de rotor. Il s'agit par exemple, mais non exclusivement, d'un disque d'une soufflante d'un turboréacteur, ladite soufflante étant positionnée en amont d'un module compresseur, ou bien d'un étage de compresseur, par exemple, à aubes rapportées sur le disque.The invention relates to a rotary assembly of a turbomachine, and in particular a turbojet, provided with a system for axially holding at least one blade of a rotor disk. This is for example, but not exclusively, a disk of a blower of a turbojet engine, said fan being positioned upstream of a compressor module, or a compressor stage, for example, with vanes reported on the disk.

L'invention s'applique à tout type de turbomachine, et en particulier à un turboréacteur, ce dernier pouvant être notamment simple flux ou double flux. Ces types de turboréacteurs sont parfaitement connus de l'homme de métier et ne seront donc pas détaillés davantage dans le présent texte.The invention applies to any type of turbomachine, and in particular to a turbojet, the latter being in particular simple flow or double flow. These types of turbojets are well known to those skilled in the art and therefore will not be detailed further in this text.

En référence à la Figure 1 illustrant le rotor d'une soufflante, le disque 1 de rotor est entrainé en rotation autour d'un axe A longitudinal par un arbre de soufflante. Le disque comprend à sa périphérie externe une alternance circonférentielle de dents 10 et de rainures 20 qui s'étendent axialement, c'est-à-dire selon une direction sensiblement parallèle à l'axe A du disque.With reference to the Figure 1 illustrating the rotor of a fan, the rotor disk 1 is rotated about a longitudinal axis A by a fan shaft. The disc comprises at its outer periphery a circumferential alternation of teeth 10 and grooves 20 which extend axially, that is to say in a direction substantially parallel to the axis A of the disc.

Des aubes 30 (représentées sur les Figures 2A, 2B, 2C), dont les pieds 31 sont aptes à être engagés axialement dans les rainures 20 du disque et retenus radialement par les dents 10, s'étendent radialement autour du disque.Blades 30 (shown on the Figures 2A, 2B, 2C ), whose feet 31 are adapted to be engaged axially in the grooves 20 of the disk and retained radially by the teeth 10, extend radially around the disk.

Des plateformes 45 sont généralement prévues sur le disque 1, et s'étendent circonférentiellement entre chaque couple d'aubes adjacentes.Plates 45 are generally provided on the disc 1, and extend circumferentially between each pair of adjacent blades.

En référence à la Figure 4, le disque 1 de rotor est du type à forme en épingle 2, en ce qu'il comprend une épingle 2 dudit disque présentant un profil recourbé en tête d'épingle qui s'éloigne radialement de l'axe du disque vers l'amont. Ce profil recourbé en tête d'épingle est un profil sensiblement en forme de C comprenant une branche axiale extérieure qui délimite les dents 10 du disque, une branche intérieure qui s'étend au moins sur une composante sensiblement axialement plus proche de l'axe moteur que la branche extérieure, et une branche frontale de raccordement à composante radiale, qui comprend de manière classique une avancée 40.With reference to the Figure 4 , the rotor disk 1 is of the pin-shaped type 2, in that it comprises a pin 2 of said disk having a curved profile at the head of the pin that moves radially away from the axis of the disk upstream . This curved profile at the head of the pin is a substantially C-shaped profile comprising an outer axial branch which delimits the teeth 10 of the disc, an inner branch which extends at least on a component substantially axially closer to the motor axis. the outer branch, and a radially-connected connecting front branch, which conventionally comprises an advance 40.

À l'aplomb de chaque rainure 20, sur l'avancée 40 de l'épingle de disque est prévu un élément de fixation 41 d'une virole 43 amont au disque 1, dont un exemple de réalisation est représenté sur la Figure 4. L'élément de fixation 41 de la virole 43 se présente généralement sous la forme d'un crochet muni d'un orifice 42 permettant la fixation de la virole 43 sur l'épingle 2 de disque 1 par vissage. La virole 43 est reliée plus en amont à un cône amont 44 formant la limite interne et amont d'une veine de circulation de fluide de la turbomachine.In line with each groove 20, on the end 40 of the disc pin is provided a fixing element 41 of a ferrule 43 upstream to the disc 1, an exemplary embodiment of which is shown in FIG. Figure 4 . The fastening element 41 of the ferrule 43 is generally in the form of a hook provided with an orifice 42 enabling the ferrule 43 to be fixed to the disk pin 2 1 by screwing. The ferrule 43 is connected further upstream to an upstream cone 44 forming the internal and upstream boundary of a fluid circulation vein of the turbomachine.

Les Figures 2A, 2B, et 2C illustrent une partie d'un ensemble rotatif, centrée sur une rainure 20 du disque 1, dont une aube 30 insérée dans la rainure 20 est maintenue axialement par le système de maintien selon l'invention, ainsi que le montage d'un tel système de maintien sur la face amont du disque 1 de rotor. Ainsi seront décrits parallèlement la structure du système de maintien et son procédé de montage sur le disque.The Figures 2A, 2B, and 2C illustrate a portion of a rotary assembly, centered on a groove 20 of the disc 1, a blade 30 inserted in the groove 20 is held axially by the holding system according to the invention, and the mounting of such a system of maintaining on the upstream face of the rotor disc 1. Thus will be described in parallel the structure of the holding system and its method of mounting on the disk.

On précise qu'un « maintien axial » signifie que l'aube est immobilisée axialement grâce au système de maintien, et que tout déplacement selon l'axe A longitudinal du disque de rotor est dès lors rendu impossible.It is specified that "axial retention" means that the blade is immobilized axially thanks to the holding system, and that any displacement along the longitudinal axis A of the rotor disk is therefore made impossible.

Sur la Figure 2A, une aube 30 est montée sur le disque 1 de rotor par insertion de son pied 31 dans la rainure 20 correspondante du disque. La rainure a une forme évasée, et est limitée circonférentiellement par deux dents 10 consécutives du disque. Elle s'étend axialement le long du disque de rotor, et comprend un fond 21, bordé par deux bordures 22 communes avec les dents 10, ainsi qu'une ouverture 23 qui constitue l'extrémité axiale amont de la rainure 20 et dont le fond 21 est situé au voisinage de l'épingle 2 de disque.On the Figure 2A a blade 30 is mounted on the rotor disc 1 by inserting its foot 31 into the corresponding groove 20 of the disc. The groove has a flared shape, and is limited circumferentially by two consecutive teeth 10 of the disc. It extends axially along the rotor disc, and comprises a bottom 21, bordered by two edges 22 common with the teeth 10, and an opening 23 which constitutes the upstream axial end of the groove 20 and whose bottom 21 is located in the vicinity of the disk pin 2.

Le pied d'aube 31 possède une forme évasée correspondant sensiblement à la forme de la rainure 20 dans laquelle il est inséré. Il est formé par deux côtés 32 qui s'étendent axialement en regard des bordures 22 de la rainure 20, par un front 33 amont reliant les deux côtés 32, ainsi qu'une base 34 qui s'étend axialement, en regard du fond 21 de la rainure. Le pied d'aube 31 est monté dans la rainure de manière à ce que son front 33 amont se situe dans le plan P du disque 1 de rotor, orthogonal à l'axe A du disque, et contenant les extrémités 13 des dents 10. En d'autres termes, le front 33 amont du pied d'aube 31 et les extrémités 13 des dents 10 ont sensiblement la même position axiale.The blade root 31 has a flared shape substantially corresponding to the shape of the groove 20 into which it is inserted. It is formed by two sides 32 which extend axially facing the borders 22 of the groove 20, by an upstream front 33 connecting the two sides 32, and a base 34 which extends axially, facing the bottom 21 of the groove. The blade root 31 is mounted in the groove so that its upstream edge 33 is located in the plane P of the rotor disk 1, orthogonal to the axis A of the disk, and containing the ends 13 of the teeth 10. In other words, the upstream front 33 of the blade root 31 and the ends 13 of the teeth 10 have substantially the same axial position.

Une dent 10 s'étend axialement le long de la périphérie externe du disque 1 et comprend deux bordures latérales 11 communes aux bordures des rainures 20 qu'elle délimite. Les bordures 20 de la dent sont reliées par une face supérieure 12 et se terminent axialement par une extrémité 13. Ainsi, l'ouverture 23 de la rainure est bordée par les extrémités 13 des dents 10. En particulier, le front 33 amont du pied d'aube, l'ouverture 23 de la rainure, et les extrémités 13 des dents se situent dans le plan P du disque 1 de rotor.A tooth 10 extends axially along the outer periphery of the disc 1 and comprises two side edges 11 common to the borders of the grooves 20 which it defines. The edges 20 of the tooth are connected by an upper face 12 and terminate axially by an end 13. Thus, the opening 23 of the groove is bordered by the ends 13 of the teeth 10. In particular, the front 33 upstream of the foot dawn, the opening 23 of the groove, and the ends 13 of the teeth are located in the plane P of the rotor disk 1.

Les extrémités 13 sont des extrémités axiales amont se présentant sous la forme d'une surface sur laquelle le système de maintien est susceptible d'être monté, conformément à ce qui suit.The ends 13 are upstream axial ends in the form of a surface on which the holding system is mountable in accordance with the following.

Les dents 10 comprennent avantageusement des sillons 14 qui s'étendent le long de leur face supérieure 12, servant à accueillir des plateformes 45. On comprendra que de tels sillons sont optionnels, de même que les plateformes qu'ils accueillent.The teeth 10 advantageously comprise grooves 14 which extend along their upper face 12, serving to accommodate platforms 45. It will be understood that such grooves are optional, as well as the platforms they accommodate.

En référence à la Figure 2B, le verrou 501 du système de maintien est plaqué contre les extrémités 13 des dents du disque 1 de manière à obturer l'ouverture 23 de la rainure. Ce faisant, le verrou 501 est en appui contre le front 33 amont du pied d'aube 31. Le verrou empêche ainsi que le pied d'aube ne sorte de la rainure par l'ouverture par un déplacement axial. On notera que l'obturation de l'ouverture 23 par le verrou 501 est au moins partielle, et doit être suffisante pour interdire le franchissement de l'ouverture par le pied d'aube.With reference to the Figure 2B , the latch 501 of the holding system is pressed against the ends 13 of the teeth of the disk 1 so as to close the opening 23 of the groove. In doing so, the lock 501 bears against the upstream front 33 of the blade root 31. The lock thus prevents the blade root from emerging from the groove through the opening by axial displacement. Note that the closure of the opening 23 by the latch 501 is at least partial, and must be sufficient to prohibit the crossing of the opening by the blade root.

Selon le mode de réalisation de l'ensemble rotatif représenté sur la Figure 2B, le verrou 501 se présente sous la forme d'une pièce comprenant une partie centrale 511 de laquelle s'étendent des bords 521. Ainsi, lorsque le verrou 501 est en place, la partie centrale 511 du verrou obture l'ouverture 23 de la rainure 20 et vient en appui contre le front amont 33 du pied d'aube, et les bords 521 du verrou viennent en appui contre extrémités 13 des dents 10.According to the embodiment of the rotary assembly shown in the Figure 2B , the latch 501 is in the form of a part comprising a central portion 511 of which extend the edges 521. Thus, when the lock 501 is in place, the central portion 511 of the lock closes the opening 23 of the groove 20 and abuts against the upstream front 33 of the blade root, and the edges 521 of the lock bear against the ends 13 of the teeth 10.

En référence à la Figure 2C, lorsque le verrou 501 est en place, des pièces amovibles 502 sont montées aux extrémités 13 des dents, en appui contre le verrou 501, afin de bloquer ledit verrou. Les pièces amovibles 502 constituent dès lors les nouvelles extrémités des dents sur lesquelles elles sont montées.With reference to the Figure 2C when the latch 501 is in place, removable parts 502 are mounted at the ends 13 of the teeth, bearing against the latch 501, to lock said latch. The removable parts 502 are therefore the new ends of the teeth on which they are mounted.

De manière avantageuse, les pièces amovibles 502 font saillie du disque 1 de rotor.Advantageously, the removable parts 502 project from the rotor disc 1.

Les pièces sont dites « amovibles » en ce qu'elles peuvent être séparées des extrémités des dents ou fixées auxdites extrémités des dents, par tout moyen prévu à cet effet.The pieces are said to be "removable" in that they can be separated from the ends of the teeth or fixed to said ends of the teeth, by any means provided for this purpose.

Le verrou est dit « bloqué » en ce qu'il est maintenu immobile, serré entre les extrémités des dents et les pièces amovibles.The lock is said to be "locked" in that it is held stationary, clamped between the ends of the teeth and the removable parts.

Selon le mode de réalisation de l'ensemble rotatif représenté sur la Figure 2C, les bords 521 du verrou 501 sont en appui à la fois contre les extrémités 13 des dents, du côté de la surface aval du verrou, et contre les pièces amovibles 502, du côté de la surface amont du verrou.According to the embodiment of the rotary assembly shown in the Figure 2C , the edges 521 of the lock 501 bear against both the ends 13 of the teeth, on the downstream surface side of the lock, and against the removable parts 502, on the upstream surface side of the lock.

Dès lors, l'aube 30 est maintenue axialement, en position dans sa rainure 20, par le système de maintien selon l'invention.Therefore, the blade 30 is held axially, in position in its groove 20, by the holding system according to the invention.

De manière avantageuse, on pourra également prévoir des moyens de maintien permettant de maintenir en position le verrou 501 contre les extrémités 13 des dents pendant le montage des pièces amovibles 502.Advantageously, it will also be possible to provide holding means for holding the latch 501 in position against the ends 13 of the teeth during assembly of the removable parts 502.

Par ailleurs, la forme (ou section) du verrou n'est pas limitée à la forme sensiblement pentagonale représentée sur les Figures 2B et 2C. La forme et les dimensions du verrou seront avantageusement choisies de manière à permettre une obturation totale de l'ouverture 23 de la rainure 20. On veillera tout particulièrement à ce que les bords 521 du verrou soient suffisamment prononcés afin d'obtenir une butée satisfaisante et stable des bords du verrou contre les extrémités 13 des dents, de manière à éviter que le verrou ne pivote ou ne bascule sur lui-même, et ne se détache accidentellement du disque 1.Moreover, the shape (or section) of the lock is not limited to the substantially pentagonal shape shown on the Figures 2B and 2C . The shape and the dimensions of the lock will advantageously be chosen so as to allow a total closure of the opening 23 of the groove 20. It will be particularly ensured that the edges 521 of the lock are sufficiently pronounced in order to obtain a satisfactory stop and stable edges of the latch against the ends 13 of the teeth, so as to prevent the latch from pivoting or tilting on itself, and accidentally detaches from the disk 1.

Le verrou peut optionnellement comprendre un bec 541 permettant de faciliter sa préhension par un utilisateur et facilitant ainsi sa mise en place ou son retrait, et peut être muni d'un orifice 551 afin de le fixer à une cale 60 sous-jacente décrite dans la suite.The lock may optionally include a spout 541 to facilitate its gripping by a user and thus facilitating its introduction or removal, and may be provided with an orifice 551 to fix it to an underlying shim 60 described in the after.

De préférence, lorsqu'une pièce amovible 502 est montée à l'extrémité 13 d'une dent, elle éclipse entièrement ladite extrémité de la dent. De manière davantage préférée, la forme (ou section) d'une pièce amovible correspond à la forme de l'extrémité de la dent sur laquelle elle est montée, de manière à prolonger la dent de manière continue. Ainsi, la pièce amovible 502 comprend notamment des sillons 552 correspondant à ceux des dents 10. Cette complémentarité des formes permet avantageusement d'obtenir une dent, lorsque la pièce amovible est montée à son extrémité, dont la structure est sensiblement similaire à l'état de l'art, à l'exception bien sûr du caractère amovible de son extrémité, ce qui offre l'avantage notamment de pouvoir mettre en oeuvre le système de maintien selon l'invention sur des disques de rotor préexistants par découpe des extrémités 13 des dents en saillie afin d'obtenir des pièces amovibles 502.Preferably, when a removable piece 502 is mounted at the end 13 of a tooth, it completely eclipses said end of the tooth. More preferably, the shape (or section) of a removable piece corresponds to the shape of the end of the tooth on which it is mounted, so as to extend the tooth continuously. Thus, the removable part 502 comprises in particular grooves 552 corresponding to those of the teeth 10. This complementarity of the forms advantageously makes it possible to obtain a tooth, when the removable part is mounted at its end, whose structure is substantially similar to the state of the art, except of course the removable nature of its end, which offers the advantage including being able to implement the holding system according to the invention on pre-existing rotor disks by cutting the ends 13 of the protruding teeth to obtain removable parts 502.

Cependant, on pourra également prévoir d'autre mode de réalisation concernant la forme des pièces amovibles, notamment des pièces annulaires, carrées, ou encore triangulaires, par exemple.However, it may also provide another embodiment concerning the shape of removable parts, including annular pieces, square, or triangular, for example.

Selon le mode de réalisation illustré sur la Figure 3, la pièce amovible 502, une fois montée sur une extrémité 13 d'une dent 10, vient en appui contre ladite extrémité 13 de la dent. Pour ce faire, la pièce amovible 502 comprend deux bords latéraux 522, et une partie centrale 512 faisant saillie sur la surface aval de la pièce, de manière à former des retraits latéraux 532. Ainsi, lorsque les pièces amovibles 502 sont montées contre le verrou 501, la partie centrale 512 de chaque pièce amovible vient en appui contre l'extrémité 13 de la dent correspondante, et les retraits latéraux 532 des pièces amovibles 502 viennent en appui contre les bords 521 du verrou 501.According to the embodiment illustrated on the Figure 3 , the removable part 502, once mounted on one end 13 of a tooth 10, bears against said end 13 of the tooth. To do this, the removable part 502 comprises two lateral edges 522, and a central portion 512 projecting on the downstream surface of the part, so as to form side recesses 532. Thus, when the removable parts 502 are mounted against the latch 501, the central portion 512 of each removable piece bears against the end 13 of the corresponding tooth, and the lateral recesses 532 of the removable parts 502 abut against the edges 521 of the lock 501.

Par ailleurs, de manière optionnelle, une cale 60 est insérée dans la rainure 20, entre le fond 21 de la rainure et la base 34 du pied de l'aube. Lorsque le verrou 501 est en place, la cale 60 est située sous le verrou, c'est-à-dire entre la périphérie du disque et le verrou. La cale 60 permet d'exercer une force dirigée radialement vers l'extérieur du disque sur le pied d'aube 31, poussant ainsi les côtés 32 du pied d'aube contre les bordures latérales 22 de la rainure, ce qui limite le mouvement de l'aube par rapport au disque, et tout particulièrement le déplacement radial de l'aube et la rotation de l'aube autour de l'axe de son pied (déplacement circonférentiel). La cale 60 peut être munie d'un orifice afin d'être fixée au bec 541 du verrou 501 par on orifice 551, au moyen d'une tige par exemple.Furthermore, optionally, a shim 60 is inserted into the groove 20, between the bottom 21 of the groove and the base 34 of the root of the blade. When the lock 501 is in place, the shim 60 is located under the lock, that is to say between the periphery of the disk and the lock. The wedge 60 makes it possible to exert a force directed radially towards the outside of the disc on the blade root 31, thus pushing the sides 32 of the blade root against the lateral edges 22 of the groove, which limits the movement of the blade. dawn with respect to the disk, and particularly the radial displacement of the blade and the rotation of the blade around the axis of its foot (circumferential movement). The shim 60 may be provided with an orifice in order to be fixed to the spout 541 of the lock 501 by means of an orifice 551, by means of a rod for example.

Les pièces amovibles 502 et les extrémités 13 des dents comportent avantageusement des moyens d'attache permettant de relier lesdites pièces amovibles auxdites extrémités des dents. De préférence, les moyens d'attache comprennent respectivement un premier orifice 542 axial prévu sur les pièces amovibles 520 et un deuxième orifice 15 axial prévu dans les extrémités 13 des dents. Lorsque les pièces amovibles 502 sont montées sur les extrémités 13 des dents, les premier 542 et deuxième 15 orifices sont alignés, et sont destinés à recevoir une tige, afin d'attacher les pièces amovibles à l'extrémité des dents.The removable parts 502 and the ends 13 of the teeth advantageously comprise attachment means for connecting said removable parts to said ends of the teeth. Preferably, the attachment means respectively comprise a first axial orifice 542 provided on the removable parts 520 and a second axial orifice 15 provided in the ends 13 of the teeth. When the removable parts 502 are mounted on the ends 13 of the teeth, the first 542 and second 15 orifices are aligned, and are intended to receive a rod, in order to attach the removable parts to the end of the teeth.

À cette même fin, les dents 10 peuvent en outre comporter un troisième orifice 16 sur leur face supérieure 12, au voisinage de leur extrémité 13, ledit troisième orifice 16 étant orthogonal au deuxième orifice 15, débouchant sur le deuxième orifice, et étant apte à recevoir par exemple un écrou tonneau.For the same purpose, the teeth 10 may further comprise a third orifice 16 on their upper face 12, in the vicinity of their end 13, said third orifice 16 being orthogonal to the second orifice 15, opening on the second orifice, and being adapted to for example, to receive a barrel nut.

On prévoit avantageusement un système de maintien adapté pour interdire la rotation des pièces amovibles 502 autour de l'axe de la tige insérée dans l'orifice 542 qui les relie à l'extrémité 13 des dents. On pourra envisager tout moyen connu d'indexation angulaire permettant d'interdire la rotation des pièces amovibles 502. Il s'agit par exemple de deux orifices supplémentaires aménagés respectivement dans les pièces amovibles et dans les extrémités des dents, parallèlement au premier orifice 542 et au deuxième orifice 15 précédents, et d'une tige logée dans lesdits orifices supplémentaires. Il peut également s'agir d'un pion ou un doigt d'indexation adapté pour venir se loger dans lesdits orifices supplémentaires. Les pièces amovibles peuvent également comprendre un épaulement venant en appui contre la face supérieure 12 des dents 10.Advantageously provided is a holding system adapted to prohibit the rotation of the removable parts 502 about the axis of the rod inserted in the orifice 542 which connects them to the end 13 of the teeth. Any known means of angular indexing allowing to prohibit the rotation of the removable parts 502 can be envisaged. It is for example two additional orifices arranged respectively in the removable parts and in the ends of the teeth, parallel to the first orifice 542 and at the second port 15 above, and a rod housed in said additional holes. It may also be a pin or an indexing finger adapted to be housed in said additional holes. The removable parts may also comprise a shoulder bearing against the upper face 12 of the teeth 10.

Un avantage du système de maintien selon l'invention est qu'il permet de rendre utilisable l'espace situé en périphérie du disque, sur l'épingle 2 de disque lorsque ce dernier est de type à forme en épingle, habituellement nécessaire à l'insertion ou au retrait du verrou au niveau de l'ouverture 23 de la rainure 20.An advantage of the holding system according to the invention is that it makes it possible to use the space located at the periphery of the disk, on the disk pin 2 when the latter is of pin-shaped type, usually necessary for the inserting or removing the latch at the opening 23 of the groove 20.

Par conséquent, le système de maintien permet d'assouplir les contraintes de dimensionnement liées au positionnement de l'élément de fixation 41 de la virole sur le disque 1 prévu sur l'avancée 40 de l'épingle 2 de disque. L'élément 41 de fixation virole-disque, et par extension l'avancée 40, peut en effet être positionné plus haut sur l'épingle du disque, au niveau de la périphérie du disque, c'est-à-dire être plus éloignée du centre du disque, comme l'illustre la flèche 46 de la Figure 4.Consequently, the holding system makes it possible to relax the dimensioning constraints related to the positioning of the fixing element 41 of the ferrule on the disk 1 provided on the end 40 of the disk pin 2. The ferrule-disk attachment element 41, and by extension the advanced 40, can indeed be positioned higher on the pin of the disk, at the periphery of the disk, that is to say be more distant from the center of the disc, as shown in arrow 46 of Figure 4 .

En reprenant le mode de réalisation courant de la fixation de la virole 43 sur l'épingle 2 de disque, l'avancée 40 fait saillie au disque 1. L'avancée 40 comprend un élément de fixation 41 qui se présente avantageusement sous la forme d'un crochet et qui est muni d'un orifice 42 de fixation de la virole au disque 1. La flèche 46 indique que le crochet de l'élément de fixation 41 est positionné plus haut sur l'épingle 2 de disque, c'est-à-dire plus éloignée radialement du centre du disque, par rapport à l'existant.Referring to the current embodiment of the attachment of the ferrule 43 to the disk pin 2, the projection 40 protrudes from the disk 1. The advance 40 comprises a fixing element 41 which is advantageously in the form of a hook and which is provided with a hole 42 for fixing the ferrule to the disc 1. The arrow 46 indicates that the hook of the fastener 41 is positioned higher on the disc pin 2, it is that is, more radially away from the center of the disc, compared to the existing one.

On comprendra que l'élément 41 de fixation de la virole 43 au disque 1 n'est pas limité au crochet illustré sur la Figure 4.It will be understood that the element 41 for fastening ferrule 43 to disk 1 is not limited to the hook illustrated on FIG. Figure 4 .

Le système de maintien selon l'invention permet ainsi de diminuer le porte-à-faux de la virole (ou le « jeu » de la virole ») qui correspond à la partie D de virole qui s'étend de l'élément de fixation 41 (de l'avancée 40) jusqu'à sa périphérie externe (sur la Figure 4, il s'agit de la partie « haute » de la virole). On diminue ainsi le couple entre la fixation de la virole et la périphérie externe de la virole.The holding system according to the invention thus makes it possible to reduce the overhang of the ferrule (or the "clearance" of the ferrule ") which corresponds to the part D of ferrule which extends from the fastening element. 41 (from advanced 40) to its outer periphery (on the Figure 4 it is the "high" part of the ferrule). This reduces the torque between the attachment of the shell and the outer periphery of the shell.

Il en résulte deux effets principaux pour l'ensemble rotatif de la turbomachine équipé du système de maintien des aubes selon l'invention :

  • Un gain de performance aérodynamique, par limitation des déplacements radiaux de la virole, et par extension de la plate-forme rattachée à la virole.
  • Un gain de masse, en ce qu'il est possible de réduire l'épaisseur et donc la masse de la virole, du fait d'un prérequis de solidité plus faible de la virole, puisque cette dernière est moins sollicitée mécaniquement.
This results in two main effects for the rotary assembly of the turbomachine equipped with the blade maintenance system according to the invention:
  • A gain in aerodynamic performance, by limiting the radial displacements of the shell, and by extension of the platform attached to the shell.
  • A gain in mass, in that it is possible to reduce the thickness and therefore the mass of the ferrule, because of a prerequisite of lower strength of the shell, since the latter is less mechanically stressed.

REFERENCESREFERENCES

  • FR2974864FR2974864
  • US 6,634,863US 6,634,863

Claims (9)

Ensemble rotatif de turbomachine, comprenant : - un disque (1) de rotor comprenant circonférentiellement une alternance de dents (10) et de rainures (20) périphériques, lesdites rainures (20) étant munies d'une ouverture (23) bordée par les extrémités (13) des dents, - une pluralité d'aubes (30) présentant des pieds (31) positionnés dans les rainures (20), l'ensemble rotatif de turbomachine comprenant en outre au moins un système de maintien axial desdites aubes (30), et étant caractérisé en ce que le système de maintien axial comprend un verrou (501) amovible monté en appui contre les extrémités axiales amont (13) de deux dents (10) consécutives du disque (1) de manière à obturer l'ouverture (23) de la rainure (20) formée par lesdites dents (10), et en ce que ledit système de maintien axial comporte des pièces amovibles (502) adaptées pour être montées aux extrémités axiales amont (13) des dents (10) et pour bloquer le verrou (501) par serrage dudit verrou entre lesdites pièces amovibles (502) et les dents (10) une fois le verrou mis en place contre les extrémités axiales amont (13) des dents (10).Rotary turbomachine assembly, comprising: - a disk (1) of rotor circumferentially comprising an alternation of teeth (10) and peripheral grooves (20), said grooves (20) being provided with an opening (23) bordered by the ends (13) of the teeth, a plurality of blades (30) having feet (31) positioned in the grooves (20), the rotary turbine engine assembly further comprising at least one system for axially holding said blades (30), and being characterized in that the axial holding system comprises a detachable latch (501) mounted in abutment against the upstream axial ends (13). ) of two consecutive teeth (10) of the disc (1) so as to close the opening (23) of the groove (20) formed by said teeth (10), and in that said axial retention system comprises removable parts (502) adapted to be mounted at the upstream axial ends (13) of the teeth (10) and to lock the latch (501) by clamping said latch between said removable parts (502) and the teeth (10) once the latch has been set. place against the upstream axial ends (13) of the teeth (10). Ensemble rotatif selon la revendication 1, caractérisé en ce que les pièces amovibles (502) ont une forme correspondant à la forme des extrémités (13) des dents (10) sur lesquelles elles sont montées, de manière à prolonger les dents (10) de manière continue.Rotary assembly according to claim 1, characterized in that the removable parts (502) have a shape corresponding to the shape of the ends (13) of the teeth (10) on which they are mounted, so as to extend the teeth (10) of continuous way. Ensemble rotatif selon l'une des revendications précédentes, caractérisé en ce que les pièces amovibles (502) sont montées aux extrémités (13) des dents (10) par vissage.Rotary assembly according to one of the preceding claims, characterized in that the removable parts (502) are mounted at the ends (13) of the teeth (10) by screwing. Ensemble rotatif selon l'une des revendications précédentes, caractérisé en ce que le verrou (501) amovible se présente sous la forme d'une pièce présentant une partie centrale (511) obturant l'ouverture (23) de la rainure (20), et des bords latéraux (521) destinés à être enserrés par les extrémités (13) des dents et les pièces amovibles (502).Rotary assembly according to one of the preceding claims, characterized in that the removable latch (501) is in the form of a part having a central portion (511) closing the opening (23) of the groove (20), and side edges (521) to be clamped by the ends (13) of the teeth and the removable pieces (502). Ensemble rotatif selon l'une des revendications précédentes, caractérisé en ce que le disque de rotor étant du type à forme en épingle (2), en ce qu'il comprend une épingle (2) dudit disque présentant un profil recourbé en tête d'épingle qui s'éloigne radialement de l'axe du disque vers l'amont, les pièces amovibles (502) font saillie du disque (1) de rotor et sont à l'aplomb d'une avancée (40) de l'épingle (2) de disque.Rotary assembly according to one of the preceding claims, characterized in that the rotor disc is of the pin-shaped type (2), in that it comprises a pin (2) of said disc having a curved profile at the head of pin that moves radially away from the axis of the disc upstream, the removable parts (502) protrude from the disk (1) of the rotor and are in line with an advance (40) of the pin ( 2) disk. Ensemble rotatif selon la revendication 5, caractérisé en ce que l'épingle (2) de disque est munie à son avancée (40) d'un élément de fixation (41) d'une virole (43) au disque, de préférence se présentant sous la forme d'un crochet, de sorte que le verrou (501) est monté à l'aplomb de l'élément de fixation (41) de la virole au disque.Rotary assembly according to claim 5, characterized in that the pin (2) disk is provided at its advance (40) a fastening element (41) of a ferrule (43) to the disk, preferably presenting itself in the form of a hook, so that the lock (501) is mounted in line with the fastening element (41) of the ferrule to the disc. Ensemble rotatif selon l'une des revendications 5 ou 6, caractérisé en ce que, entre l'avancée (40) de l'épingle (2) de disque et les dents (10), l'épingle (2) de disque est dépourvue d'espace (E) d'insertion et/ou de retrait du verrou (501).Rotary assembly according to one of Claims 5 or 6, characterized in that , between the advance (40) of the disc pin (2) and the teeth (10), the disc pin (2) is devoid of space (E) insertion and / or removal of the lock (501). Turbomachine caractérisée en ce qu'elle comprend un ou plusieurs ensemble(s) rotatif(s) comprenant au moins un système de maintien axial d'une aube (30) du disque (1) de rotor selon l'une des revendications précédentes.Turbomachine characterized in that it comprises one or more rotary assembly (s) comprising at least one axial retention system of a blade (30) of the rotor disc (1) according to one of the preceding claims. Procédé de montage d'un système de maintien axial d'une aube sur un ensemble rotatif de turbomachine selon l'une des revendications 1 à 7, l'ensemble rotatif comprenant un disque (1) de rotor muni circonférentiellement d'une alternance de dents (10) et de rainures (20) périphériques, lesdites rainures (20) étant munies d'une ouverture (23) bordée par les extrémités (13) des dents, et au moins une aube (30) dont le pied (31) est inséré dans une rainure (20), le procédé de montage étant caractérisé en ce qu'il comprend : - le montage d'un verrou (501) en appui contre les extrémités (13) des dents (10), de manière à obturer l'ouverture (23) de la rainure (20), - le montage des pièces amovibles (502) aux extrémités (13) des dents (10) afin de bloquer le verrou (501) par serrage dudit verrou entre lesdites pièces amovibles (502) et les dents (10). A method of mounting an axial retention system of a blade on a rotary turbine engine assembly according to one of claims 1 to 7, the rotary assembly comprising a rotor disc (1) circumferentially provided with an alternation of teeth (10) and peripheral grooves (20), said grooves (20) being provided with an opening (23) bordered by the ends (13) of the teeth, and at least one blade (30) whose foot (31) is inserted in a groove (20), the mounting method being characterized in that it comprises: - mounting a latch (501) bearing against the ends (13) of the teeth (10), so as to close the opening (23) of the groove (20), - Mounting the removable parts (502) at the ends (13) of the teeth (10) to lock the latch (501) by clamping said latch between said removable parts (502) and the teeth (10).
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CN107975389B (en) 2022-02-22
EP3312384B1 (en) 2020-03-11
US20180112545A1 (en) 2018-04-26
FR3057908A1 (en) 2018-04-27
CN107975389A (en) 2018-05-01
US10570757B2 (en) 2020-02-25
FR3057908B1 (en) 2019-11-22

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