EP2427658B1 - Fan rotor for an airplane turbojet engine - Google Patents

Fan rotor for an airplane turbojet engine Download PDF

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Publication number
EP2427658B1
EP2427658B1 EP10723700.0A EP10723700A EP2427658B1 EP 2427658 B1 EP2427658 B1 EP 2427658B1 EP 10723700 A EP10723700 A EP 10723700A EP 2427658 B1 EP2427658 B1 EP 2427658B1
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EP
European Patent Office
Prior art keywords
latch
groove
main
lock
fan rotor
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EP10723700.0A
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German (de)
French (fr)
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EP2427658A1 (en
Inventor
Hervé BUISSON
Jean-Luc Goga
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Safran Aircraft Engines SAS
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SNECMA SAS
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Publication of EP2427658A1 publication Critical patent/EP2427658A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
    • F04D29/322—Blade mountings
    • 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
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates

Definitions

  • the invention relates to a fan rotor of an aircraft turbojet and more particularly concerns the locking of the blade roots in their respective grooves. It aims in particular the development of the system of individual locks to maintain the blades in their respective grooves. It also relates to an aircraft turbojet engine whose fan is equipped with such a rotor.
  • the rotor of the fan carries a number of blades, each blade having a blade root blade engaged in a groove formed at the periphery of a wheel.
  • the grooves are defined between radial protuberances provided with longitudinal lateral protrusions, covering the edges of the grooves and shaped to retain the blade roots.
  • each blade root is engaged in its groove by sliding it by the upstream end thereof.
  • upstream and downstream are used to denote respectively a forward or a rearward position of the engine, according to the direction of flow of the air in the blower.
  • the role of the locks is important since the axial force that the blade root exerts on each of them is normally between 500 and 900 kg. In addition, in case of damage, up to the breaking of a blade, the lock must allow to dissipate the shock energy and minimize the deterioration of blades and neighboring parts.
  • honeycomb structure made from fairly thin strip, is difficult to fix (weld) on the downstream face of the thick metal element of said lock.
  • the cost price of such a lock is also quite high.
  • the invention solves these problems.
  • EP 0 061 948 discloses a blade lock device where a so-called main lock is associated with an additional lock spaced therefrom.
  • the invention relates to a fan rotor comprising fan blades attached to the periphery of a wheel, each blade having a blade root engaged in a groove of said wheel and retained therein by a latch engaged in notches made in the vicinity and on either side of the upstream end of the corresponding groove, to oppose a displacement of said blade root axially, each said lock said main lock being associated with a lock separate additional said main lock, characterized in that this additional lock is spaced from the main lock a predetermined distance, said additional lock being located between said main lock and the upstream end of said blade root engaged in the groove.
  • the additional lock is a thin wall.
  • Said thin wall is advantageously deformable material, such as a metal plate engaged in corresponding notches formed on either side of the groove upstream thereof.
  • This metal plate whose outer contour is advantageously similar to that of the main lock, may, for example, be made of stainless steel or any other metal capable of deforming without breaking, coming crashing against the downstream face of the lock main.
  • the deformation of the thin plate causes neither its extraction nor the formation of debris likely to damage the neighboring blades.
  • the cost of said additional lock is very low. Its thickness is low compared to the thickness of the main lock, usually of the order of 1/4 to 1/3 of the thickness of the main lock. Consequently, the corresponding notches practiced on the other of the groove are also of small width and can therefore easily be made by a machining type electroerosion wire.
  • the additional lock comprises a tongue extending substantially perpendicular to its surface, upstream.
  • This tongue is welded to an edge of said main lock. Accordingly, at the time of assembly, there is a single locking assembly, the spacing between the two locks being predetermined by the length of the tongue.
  • This locking assembly can be implemented by introducing the two locks in their respective notches by their inner radial ends opening.
  • a fixing lug protrudes upstream of said main lock, for mounting a wedge inserted between the blade root and the bottom of said groove.
  • the wedge traditionally housed at the bottom of the groove, is fixed to the main latch and immobilized axially by the establishment thereof. Conversely, the wedge prevents the release of the lock.
  • the fan rotor 11 as shown, consists mainly of a disc constituting a wheel 13, to which are attached fan blades 15.
  • Each blade comprises a blade root 17, provided with lateral ribs, engaged in a groove 18 , corresponding wheel 13.
  • the latter and has at its periphery radial protuberances 20, extending over a certain length, parallel to the axis of the rotor.
  • These radial protuberances are provided with lateral bosses 22 extending above the edges of the adjacent grooves 18.
  • a longitudinal shim 24 is inserted between the bottom of each groove and the blade root therein, to stabilize the position of the blade, radially.
  • the upstream ends of the grooves are closed individually by locks 28.
  • a lock 28 is hereinafter referred to as the main lock.
  • Each main latch 28 is engaged in notches 34 formed on either side of the groove 18 that closes in the vicinity of the upstream end thereof.
  • the end portions 19 of the radial protuberances 20 project upstream with respect to the upstream face 13a of the wheel 13.
  • Each notch 34 is formed in this portion projecting from the adjacent radial protuberance 20.
  • the notches 34 open in front of the groove and are oriented so as to converge towards each other radially outwards.
  • a corresponding main latch 28 has edges 30 having the same convergence as the notches.
  • each main latch 28 is associated with a deformable, thin wall additional lock 32 separate from said main latch 28 and spaced therefrom by a predetermined distance.
  • the additional lock 32 is therefore interposed between the main latch 28 and the upstream end of the blade root 17 mounted in the corresponding groove.
  • the additional lock 32 is a metal plate, for example made of stainless steel, engaged in corresponding notches 36 formed on either side of said groove, in the end portions 19 projecting from the adjacent radial protuberances 20.
  • the notches 34 of the main latch 28 and those of the additional latch 32 open radially internally to the front of the upstream face 13a of the wheel 13.
  • the additional latch 32 has substantially the same contour as the main latch 28 and the notches 36 in which it is engaged are also similar to those that host the neighboring main lock. However, they have a smaller axial length since the additional lock 32 is thinner than the main lock.
  • the thickness of the additional lock will be approximately one quarter to one third of the thickness of the main lock.
  • the additional latch has a tongue 38 extending substantially perpendicular to its surface toward the main latch and this tongue is welded to an edge 37 of the main latch.
  • a unitary locking assembly 28, 32 to close the upstream end of each groove 18. The assembly is done by inserting the two latches simultaneously in their notches, radially outwardly.
  • a bracket 40 protrudes upstream of the main lock for immobilizing the wedge 24 inserted between the blade root and the bottom of the groove.
  • the fixing lug 40 is provided with a captive nut 42 and the end of the shim is pierced with a hole.
  • the wedge 24 is slid into the groove 18 between the bottom wall thereof and the inner radial face of the blade root and the end of the wedge is fixed to the leg of the blade. fastening by means of a screw or the like. The screw passes through the hole in the hold and is screwed into the lock nut.
  • a bracing piece 45 is interposed between the end of shim 24 and the fixing lug 40.
  • the notches 36 of the additional lock are narrow and therefore they can be made by implementing a wire electroerosion process. This operation can be performed on an already existing rotor wheel, that is to say not originally provided for this type of lock.

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

Description

L'invention se rapporte à un rotor de soufflante d'un turboréacteur d'avion et concerne plus particulièrement le verrouillage des pieds d'aubes dans leurs rainures respectives. Elle vise en particulier le perfectionnement du système de verrous individuels permettant de maintenir les aubes dans leurs rainures respectives. Elle se rapporte également à un turboréacteur d'avion dont la soufflante est équipée d'un tel rotor.The invention relates to a fan rotor of an aircraft turbojet and more particularly concerns the locking of the blade roots in their respective grooves. It aims in particular the development of the system of individual locks to maintain the blades in their respective grooves. It also relates to an aircraft turbojet engine whose fan is equipped with such a rotor.

Dans un turboréacteur double flux, le rotor de la soufflante porte un certain nombre d'aubes, chaque aube comportant un pied d'aube nervuré engagé dans une rainure ménagée à la périphérie d'une roue. Les rainures sont définies entre des protubérances radiales munies de bossages latéraux longitudinaux, recouvrant les bords des rainures et conformés pour retenir les pieds d'aube.In a double-flow turbojet, the rotor of the fan carries a number of blades, each blade having a blade root blade engaged in a groove formed at the periphery of a wheel. The grooves are defined between radial protuberances provided with longitudinal lateral protrusions, covering the edges of the grooves and shaped to retain the blade roots.

Au montage, on engage chaque pied d'aube dans sa rainure en le faisant glisser par l'extrémité amont de celle-ci.In the assembly, each blade root is engaged in its groove by sliding it by the upstream end thereof.

Dans la suite du texte, les termes "amont" et "aval" sont utilisés pour désigner respectivement une position vers l'avant ou vers l'arrière du moteur, suivant le sens d'écoulement de l'air dans la soufflante.In the rest of the text, the terms "upstream" and "downstream" are used to denote respectively a forward or a rearward position of the engine, according to the direction of flow of the air in the blower.

Il est connu de fermer chaque rainure à son extrémité amont par un verrou engagé dans des encoches latérales pratiquées de part et d'autre de la rainure, dans des prolongements amont desdites protubérances radiales, sortes de dents faisant saillie à l'amont de la roue. Ces encoches sont orientées de façon à converger l'une vers l'autre radialement vers l'extérieur. Les verrous comportent des bords latéraux présentant la même convergence que lesdites encoches. Ils sont montés en étant engagés par les extrémités radiales internes, débouchantes, des encoches pratiquées dans lesdites dents.It is known to close each groove at its upstream end by a latch engaged in lateral notches made on either side of the groove, in upstream extensions of said radial protuberances, kinds of teeth protruding upstream of the wheel. . These notches are oriented so as to converge towards each other radially outwards. The locks have side edges having the same convergence as said notches. They are mounted by being engaged by the inner radial ends, outlets, notches made in said teeth.

Le rôle des verrous est important puisque la force axiale que le pied d'aube exerce sur chacun d'eux est comprise, normalement, entre 500 et 900 kg. De plus, en cas d'avarie, pouvant aller jusqu'à la rupture d'une aube, le verrou doit permettre de dissiper l'énergie de choc et de minimiser la détérioration des aubes et pièces voisines.The role of the locks is important since the axial force that the blade root exerts on each of them is normally between 500 and 900 kg. In addition, in case of damage, up to the breaking of a blade, the lock must allow to dissipate the shock energy and minimize the deterioration of blades and neighboring parts.

On connaît, du document US 5 259 728 un type de verrou comportant un élément métallique relativement épais, par exemple en titane, portant sur sa face aval une structure d'amortissement constituée par un élément creux en nid d'abeilles. Cette structure est suffisamment rigide pour résister aux sollicitations normales du pied d'aube. En cas d'incident grave, elle permet, en s'écrasant, d'amortir le choc.We know from the document US 5,259,728 a type of lock comprising a relatively thick metal element, for example in titanium, bearing on its downstream face a damping structure constituted by a hollow honeycomb element. This structure is rigid enough to withstand the normal stresses of the blade root. In case of serious incident, it allows, crashing, to dampen the shock.

Cependant, la structure en nid d'abeilles faite à partir de feuillard assez mince, est difficile à fixer (souder) sur la face aval de l'élément métallique épais dudit verrou. Le prix de revient d'un tel verrou est en outre assez élevé.However, the honeycomb structure made from fairly thin strip, is difficult to fix (weld) on the downstream face of the thick metal element of said lock. The cost price of such a lock is also quite high.

L'invention permet de résoudre ces problèmes.The invention solves these problems.

Par ailleurs EP 0 061 948 décrit un dispositif de verrouillages d'aubes où un verrou dit principal est associé à un verrou supplémentaire espacé de celui-ci.otherwise EP 0 061 948 discloses a blade lock device where a so-called main lock is associated with an additional lock spaced therefrom.

Plus précisément, l'invention concerne un rotor de soufflante comportant des aubes de soufflante rattachées à la périphérie d'une roue, chaque aube comportant un pied d'aube engagé dans une rainure de ladite roue et retenu dans celle-ci par un verrou engagé dans des encoches pratiquées au voisinage et de part et d'autre de l'extrémité amont de la rainure correspondante, pour s'opposer à un déplacement dudit pied d'aube en direction axiale, chaque verrou précité dit verrou principal étant associé à un verrou supplémentaire distinct dudit verrou principal, caractérisé en ce que ce verrou supplémentaire est espacé du verrou principal d'une distance prédéterminée, ledit verrou supplémentaire étant situé entre ledit verrou principal et l'extrémité amont dudit pied d'aube engagé dans la rainure.More specifically, the invention relates to a fan rotor comprising fan blades attached to the periphery of a wheel, each blade having a blade root engaged in a groove of said wheel and retained therein by a latch engaged in notches made in the vicinity and on either side of the upstream end of the corresponding groove, to oppose a displacement of said blade root axially, each said lock said main lock being associated with a lock separate additional said main lock, characterized in that this additional lock is spaced from the main lock a predetermined distance, said additional lock being located between said main lock and the upstream end of said blade root engaged in the groove.

Selon un mode de réalisation, le verrou supplémentaire est une paroi mince. Ladite paroi mince est avantageusement en matériau déformable, comme par exemple une plaque de métal engagée dans des encoches correspondantes pratiquées de part et d'autre de la rainure en amont de celle-ci.According to one embodiment, the additional lock is a thin wall. Said thin wall is advantageously deformable material, such as a metal plate engaged in corresponding notches formed on either side of the groove upstream thereof.

Cette plaque de métal dont le contour extérieur est avantageusement semblable à celui du verrou principal, peut, par exemple, être réalisée en acier inoxydable ou en tout autre métal susceptible de se déformer sans casser, en venant s'écraser contre la face aval du verrou principal. La déformation de la plaque mince n'entraîne ni son extraction, ni la formation de débris susceptibles d'endommager les aubes voisines.This metal plate whose outer contour is advantageously similar to that of the main lock, may, for example, be made of stainless steel or any other metal capable of deforming without breaking, coming crashing against the downstream face of the lock main. The deformation of the thin plate causes neither its extraction nor the formation of debris likely to damage the neighboring blades.

Le coût dudit verrou supplémentaire est très faible. Son épaisseur est faible au regard de l'épaisseur du verrou principal, habituellement de l'ordre de 1/4 à 1/3 de l'épaisseur du verrou principal. En conséquence, les encoches correspondantes pratiquées de part et d'autre de la rainure sont également de faible largeur et peuvent par conséquent être aisément réalisées par un usinage du type électroérosion au fil.The cost of said additional lock is very low. Its thickness is low compared to the thickness of the main lock, usually of the order of 1/4 to 1/3 of the thickness of the main lock. Consequently, the corresponding notches practiced on the other of the groove are also of small width and can therefore easily be made by a machining type electroerosion wire.

On peut même envisager d'adapter ce nouveau type de verrouillage sur des roues existantes, déjà en service, par exemple lors d'une opération de maintenance.One can even consider adapting this new type of lock on existing wheels, already in use, for example during a maintenance operation.

Selon une autre caractéristique avantageuse, le verrou supplémentaire comporte une languette s'étendant sensiblement perpendiculairement à sa surface, vers l'amont. Cette languette est soudée à un bord dudit verrou principal. En conséquence, au moment du montage, on dispose d'un seul ensemble de verrouillage, l'écartement entre les deux verrous étant prédéterminé par la longueur de la languette. Cet ensemble de verrouillage peut être mis en place en introduisant les deux verrous dans leurs encoches respectives par leurs extrémités radiales internes débouchantes.According to another advantageous characteristic, the additional lock comprises a tongue extending substantially perpendicular to its surface, upstream. This tongue is welded to an edge of said main lock. Accordingly, at the time of assembly, there is a single locking assembly, the spacing between the two locks being predetermined by the length of the tongue. This locking assembly can be implemented by introducing the two locks in their respective notches by their inner radial ends opening.

Selon une autre caractéristique avantageuse, une patte de fixation fait saillie à l'amont dudit verrou principal, pour le montage d'une cale insérée entre le pied d'aube et le fond de ladite rainure. Ainsi, la cale, traditionnellement logée au fond de la rainure, est fixée au verrou principal et immobilisée axialement par la mise en place de celui-ci. Inversement, la cale empêche le dégagement du verrou.According to another advantageous characteristic, a fixing lug protrudes upstream of said main lock, for mounting a wedge inserted between the blade root and the bottom of said groove. Thus, the wedge, traditionally housed at the bottom of the groove, is fixed to the main latch and immobilized axially by the establishment thereof. Conversely, the wedge prevents the release of the lock.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue partielle en perspective de la roue du rotor de soufflante montrant l'extrémité d'une rainure ;
  • la figure 2 est une vue en élévation de l'ensemble de verrouillage composé des deux verrous ;
  • la figure 3 est une vue en perspective du même ensemble de verrouillage ;
  • la figure 4 est une vue partielle en perspective de la roue, avec l'aube et l'ensemble de verrouillage en place ;
  • la figure 5 est une vue partielle selon la flèche V de la figure 4, l'ensemble de verrouillage étant fixé à la cale installée sous le pied d'aube ; et
  • la figure 6 est une vue selon la flèche VI de la figure 5.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description given solely by way of example and with reference to the appended drawings in which:
  • the figure 1 is a partial perspective view of the fan rotor wheel showing the end of a groove;
  • the figure 2 is an elevational view of the locking assembly composed of the two locks;
  • the figure 3 is a perspective view of the same lock assembly;
  • the figure 4 is a partial perspective view of the wheel, with the dawn and lock assembly in place;
  • the figure 5 is a partial view along arrow V of the figure 4 , the locking assembly being fixed to the hold installed under the blade root; and
  • the figure 6 is a view according to the arrow VI of the figure 5 .

Le rotor de soufflante 11 tel que représenté, se compose principalement d'un disque constituant une roue 13, auquel sont rattachées des aubes de soufflante 15. Chaque aube comporte un pied d'aube 17, muni de nervures latérales, engagées dans une rainure 18, correspondante de la roue 13. Cette dernière comporte ainsi à sa périphérie des protubérances radiales 20, s'étendant sur une certaine longueur, parallèlement à l'axe du rotor. Ces protubérances radiales sont munies de bossages latéraux 22 s'étendant au-dessus des bords des rainures 18 voisines. Ainsi, la forme des rainures 18 et des protubérances 20 est déterminée pour retenir les pieds d'aube. Une cale longitudinale 24 est insérée entre le fond de chaque rainure et le pied d'aube qui s'y trouve, pour stabiliser la position de l'aube, radialement. Les extrémités amont des rainures sont refermées individuellement par des verrous 28. Un verrou 28 est ci-après dénommé verrou principal.The fan rotor 11 as shown, consists mainly of a disc constituting a wheel 13, to which are attached fan blades 15. Each blade comprises a blade root 17, provided with lateral ribs, engaged in a groove 18 , corresponding wheel 13. The latter and has at its periphery radial protuberances 20, extending over a certain length, parallel to the axis of the rotor. These radial protuberances are provided with lateral bosses 22 extending above the edges of the adjacent grooves 18. Thus, the shape of the grooves 18 and protuberances 20 is determined to retain the blade roots. A longitudinal shim 24 is inserted between the bottom of each groove and the blade root therein, to stabilize the position of the blade, radially. The upstream ends of the grooves are closed individually by locks 28. A lock 28 is hereinafter referred to as the main lock.

Chaque verrou principal 28 est engagé dans des encoches 34 pratiquées de part et d'autre de la rainure 18 qu'il referme au voisinage de l'extrémité amont de celle-ci. Les portions d'extrémité 19 des protubérances radiales 20 font saillie vers l'amont par rapport à la face amont 13a de la roue 13. Chaque encoche 34 est pratiquée dans cette partie en saillie de la protubérance radiale 20 adjacente. Ainsi disposé, le verrou peut s'opposer au déplacement de l'aube en direction axiale vers l'amont.Each main latch 28 is engaged in notches 34 formed on either side of the groove 18 that closes in the vicinity of the upstream end thereof. The end portions 19 of the radial protuberances 20 project upstream with respect to the upstream face 13a of the wheel 13. Each notch 34 is formed in this portion projecting from the adjacent radial protuberance 20. Thus arranged, the lock can oppose the movement of the blade in the axial direction upstream.

Les encoches 34 débouchent en avant de la rainure et sont orientées de façon à converger l'une vers l'autre radialement vers l'extérieur. Un verrou principal 28 correspondant comporte des bords 30 présentant la même convergence que les encoches.The notches 34 open in front of the groove and are oriented so as to converge towards each other radially outwards. A corresponding main latch 28 has edges 30 having the same convergence as the notches.

Selon une caractéristique importante de l'invention, chaque verrou principal 28 est associé à un verrou supplémentaire 32 à paroi mince, déformable, distinct dudit verrou principal 28 et espacé de celui-ci d'une distance prédéterminé. Le verrou supplémentaire 32 se trouve donc intercalé entre le verrou principal 28 et l'extrémité amont du pied d'aube 17 monté dans la rainure correspondante.According to an important feature of the invention, each main latch 28 is associated with a deformable, thin wall additional lock 32 separate from said main latch 28 and spaced therefrom by a predetermined distance. The additional lock 32 is therefore interposed between the main latch 28 and the upstream end of the blade root 17 mounted in the corresponding groove.

Plus précisément, le verrou supplémentaire 32 est une plaque de métal, par exemple en acier inoxydable, engagée dans des encoches 36 correspondantes pratiquées de part et d'autre de ladite rainure, dans les portions d'extrémité 19, en saillie, des protubérances radiales 20 adjacentes. Ainsi, les encoches 34 du verrou principal 28 et celles du verrou supplémentaire 32 débouchent radialement intérieurement à l'avant de la face amont 13a de la roue 13. Le verrou supplémentaire 32 a sensiblement le même contour que le verrou principal 28 et les encoches 36 dans lesquelles il est engagé sont aussi semblables à celles qui accueillent le verrou principal voisin. Elles ont cependant une plus faible longueur axiale puisque le verrou supplémentaire 32 est plus mince que le verrou principal. Typiquement, l'épaisseur du verrou supplémentaire sera approximativement comprise entre le quart et le tiers de l'épaisseur du verrou principal.More specifically, the additional lock 32 is a metal plate, for example made of stainless steel, engaged in corresponding notches 36 formed on either side of said groove, in the end portions 19 projecting from the adjacent radial protuberances 20. Thus, the notches 34 of the main latch 28 and those of the additional latch 32 open radially internally to the front of the upstream face 13a of the wheel 13. The additional latch 32 has substantially the same contour as the main latch 28 and the notches 36 in which it is engaged are also similar to those that host the neighboring main lock. However, they have a smaller axial length since the additional lock 32 is thinner than the main lock. Typically, the thickness of the additional lock will be approximately one quarter to one third of the thickness of the main lock.

Comme on le voit sur les dessins, le verrou supplémentaire comporte une languette 38 s'étendant sensiblement perpendiculairement à sa surface en direction du verrou principal et cette languette est soudée à un bord 37 du verrou principal. On dispose ainsi d'un ensemble de verrouillage 28, 32 unitaire pour venir fermer l'extrémité amont de chaque rainure 18. Le montage se fait en insérant les deux verrous simultanément dans leurs encoches, radialement vers l'extérieur.As seen in the drawings, the additional latch has a tongue 38 extending substantially perpendicular to its surface toward the main latch and this tongue is welded to an edge 37 of the main latch. There is thus a unitary locking assembly 28, 32 to close the upstream end of each groove 18. The assembly is done by inserting the two latches simultaneously in their notches, radially outwardly.

En outre, une patte de fixation 40 fait saillie à l'amont du verrou principal pour l'immobilisation de la cale 24 insérée entre le pied d'aube et le fond de la rainure. La patte de fixation 40 est pourvue d'un écrou prisonnier 42 et l'extrémité de la cale est percée d'un trou. Ainsi, après mise en place des verrous, la cale 24 est glissée dans la rainure 18 entre la paroi de fond de celle-ci et la face radiale interne du pied d'aube et l'extrémité de la cale est fixée à la patte de fixation au moyen d'une vis ou analogue. La vis traverse le trou de la cale et est vissée dans l'écrou du verrou. Une pièce d'entretoisement 45 est intercalée entre l'extrémité de la cale 24 et la patte de fixation 40.In addition, a bracket 40 protrudes upstream of the main lock for immobilizing the wedge 24 inserted between the blade root and the bottom of the groove. The fixing lug 40 is provided with a captive nut 42 and the end of the shim is pierced with a hole. Thus, after placing the locks, the wedge 24 is slid into the groove 18 between the bottom wall thereof and the inner radial face of the blade root and the end of the wedge is fixed to the leg of the blade. fastening by means of a screw or the like. The screw passes through the hole in the hold and is screwed into the lock nut. A bracing piece 45 is interposed between the end of shim 24 and the fixing lug 40.

Les encoches 36 du verrou supplémentaire sont étroites et par conséquent elles peuvent être réalisées par mise en oeuvre d'un procédé d'électroérosion à fil. Cette opération peut s'effectuer sur une roue de rotor déjà existante, c'est-à-dire non prévue à l'origine pour ce type de verrouillage.The notches 36 of the additional lock are narrow and therefore they can be made by implementing a wire electroerosion process. This operation can be performed on an already existing rotor wheel, that is to say not originally provided for this type of lock.

Claims (7)

  1. A fan rotor comprising fan blades (15) attached to the periphery of a wheel (13), each blade having a blade root engaged in a groove in said wheel and retained therein by a latch (28) engaged in notches (34) formed in the vicinity of and on either side of the upstream end of the corresponding groove in order to oppose movement of said blade root in an axial direction, each above-mentioned latch, referred to as a "main" latch (28), being associated with an additional latch that is distinct from said main latch, the rotor being characterized in that the additional latch is spaced apart from the main latch at a predetermined distance, said additional latch (32) being situated between said main latch and the upstream end of said blade root engaged in the groove.
  2. A fan rotor according to claim 1, characterized in that said additional latch (32) is a thin wall engaged in corresponding notches (36) formed in either side of said groove.
  3. A fan rotor according to claim 2, characterized in that said thin wall is made of deformable material.
  4. A fan rotor according to any preceding claim, characterized in that said additional latch (32) is essentially constituted by a metal plate.
  5. A fan rotor according to any preceding claim, characterized in that said additional latch (32) includes a tongue (38) extending upstream substantially perpendicularly to its surface and welded to an edge of said main latch.
  6. A fan rotor according to any preceding claim, characterized in that a fastener tab (40) projects upstream from said main latch (28) for mounting a wedge (24) inserted between the blade root and the bottom of said groove.
  7. A turbojet, characterized in that it is fitted with a fan corresponding to a rotor according to any preceding claim.
EP10723700.0A 2009-05-06 2010-04-19 Fan rotor for an airplane turbojet engine Active EP2427658B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0953001A FR2945329B1 (en) 2009-05-06 2009-05-06 BLOWER ROTOR OF AN AIRCRAFT TURBORACTOR
PCT/FR2010/050747 WO2010128229A1 (en) 2009-05-06 2010-04-19 Fan rotor for an airplane turbojet engine

Publications (2)

Publication Number Publication Date
EP2427658A1 EP2427658A1 (en) 2012-03-14
EP2427658B1 true EP2427658B1 (en) 2015-07-08

Family

ID=41278266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10723700.0A Active EP2427658B1 (en) 2009-05-06 2010-04-19 Fan rotor for an airplane turbojet engine

Country Status (9)

Country Link
US (1) US8899935B2 (en)
EP (1) EP2427658B1 (en)
JP (1) JP5497157B2 (en)
CN (1) CN102422026B (en)
BR (1) BRPI1013848A2 (en)
CA (1) CA2760470A1 (en)
FR (1) FR2945329B1 (en)
RU (1) RU2525817C2 (en)
WO (1) WO2010128229A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8840375B2 (en) * 2011-03-21 2014-09-23 United Technologies Corporation Component lock for a gas turbine engine
GB201317161D0 (en) 2013-09-27 2013-11-06 Rolls Royce Plc Retainer plate
GB201318623D0 (en) 2013-10-22 2013-12-04 Rolls Royce Plc Retainer plate
FR3057908B1 (en) * 2016-10-21 2019-11-22 Safran Aircraft Engines ROTARY ASSEMBLY OF A TURBOMACHINE PROVIDED WITH AN AXIAL MAINTAINING SYSTEM OF A DAWN
RU2659416C1 (en) * 2017-04-07 2018-07-02 Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения имени П.И. Баранова" Gas turbine engine compressor impeller

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395891A (en) * 1967-09-21 1968-08-06 Gen Electric Lock for turbomachinery blades
FR2502690B1 (en) 1981-03-27 1985-09-13 Snecma DEVICE FOR LOCKING BLOWER VANES AND FOR FIXING A FRONT HOOD OF A TURBO-JET
FR2535793B1 (en) * 1982-11-08 1987-04-10 Snecma AXIAL LOCKING DEVICE FOR BLOWER BLADES
FR2535794A1 (en) * 1982-11-08 1984-05-11 Snecma AXIAL AND RADIAL BLADE SUPPORT DEVICE
SU1130693A1 (en) * 1983-04-11 1984-12-23 Производственное объединение "Брянский машиностроительный завод" им.В.И.Ленина Apparatus for axial securing of turbomachine blades
US5259728A (en) * 1992-05-08 1993-11-09 General Electric Company Bladed disk assembly
US5350279A (en) * 1993-07-02 1994-09-27 General Electric Company Gas turbine engine blade retainer sub-assembly
US5984639A (en) * 1998-07-09 1999-11-16 Pratt & Whitney Canada Inc. Blade retention apparatus for gas turbine rotor
FR2886336B1 (en) * 2005-05-26 2007-08-24 Snecma Moteurs Sa IMPROVEMENT TO A ROTOR AUBAGEE WHEEL TO ENHANCE THE LOCKING OF AUBES
FR2889264B1 (en) * 2005-07-29 2007-11-02 Snecma LOCKING AUBES IN A BLOWER ROTOR
FR2900437B1 (en) 2006-04-27 2008-07-25 Snecma Sa SYSTEM FOR RETENTING AUBES IN A ROTOR

Also Published As

Publication number Publication date
US20120045341A1 (en) 2012-02-23
JP5497157B2 (en) 2014-05-21
WO2010128229A1 (en) 2010-11-11
RU2525817C2 (en) 2014-08-20
FR2945329A1 (en) 2010-11-12
CN102422026A (en) 2012-04-18
US8899935B2 (en) 2014-12-02
EP2427658A1 (en) 2012-03-14
CN102422026B (en) 2014-08-20
BRPI1013848A2 (en) 2016-04-12
FR2945329B1 (en) 2011-06-03
RU2011149487A (en) 2013-06-20
CA2760470A1 (en) 2010-11-11
JP2012526231A (en) 2012-10-25

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