EP2179195A2 - Vibration damper for aircraft nacelle - Google Patents

Vibration damper for aircraft nacelle

Info

Publication number
EP2179195A2
EP2179195A2 EP08842552A EP08842552A EP2179195A2 EP 2179195 A2 EP2179195 A2 EP 2179195A2 EP 08842552 A EP08842552 A EP 08842552A EP 08842552 A EP08842552 A EP 08842552A EP 2179195 A2 EP2179195 A2 EP 2179195A2
Authority
EP
European Patent Office
Prior art keywords
screw
impactor
fixed structure
bowl
block
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.)
Withdrawn
Application number
EP08842552A
Other languages
German (de)
French (fr)
Inventor
Pierre Moradell-Casellas
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 Nacelles SAS
Original Assignee
Aircelle SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aircelle SA filed Critical Aircelle SA
Publication of EP2179195A2 publication Critical patent/EP2179195A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/371—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by inserts or auxiliary extension or exterior elements, e.g. for rigidification
    • F16F1/3713—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by inserts or auxiliary extension or exterior elements, e.g. for rigidification with external elements passively influencing spring stiffness, e.g. rings or hoops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0052—Physically guiding or influencing
    • F16F2230/007—Physically guiding or influencing with, or used as an end stop or buffer; Limiting excessive axial separation

Definitions

  • the present invention relates to a vibration damper for a housing installed on an aircraft nacelle.
  • a vibration damper capable of being interposed between an electronic box and a fixed structure of aircraft nacelle, comprising a block made of elastic material, a screw for fixing this block on said fixed structure, and means fixing said housing to said block.
  • the electronic box may typically be a control box for various functions of the nacelle, such as the function of opening a nacelle part for maintenance operations.
  • Vibration dampers protect the electronic components of this housing vis-à-vis vibrations generated by the turbojet engine located inside the nacelle.
  • Such a stirrup makes it possible to retain the damper in place when it is destroyed under the effect of vibrations of high amplitude, and thus to avoid that the electronic unit is completely detached from the fixed structure of the nacelle.
  • bracket and its fasteners are additional parts that maintenance technicians may forget to reassemble during replacement and / or maintenance operations.
  • the present invention is intended to overcome these disadvantages.
  • a vibration damper able to be interposed between an electronic box and a fixed structure of aircraft nacelle, comprising a block of elastic material, a screw for fixing this block on said fixed structure, and means for securing said housing to said block, characterized in that it comprises means for limiting the stroke of said fixing means relative to said fixing screw in at least two directions of space, these limiting means being dimensioned to avoid a biasing of said screw may lead to fatigue and / or rupture " ⁇ >
  • stroke limiting means makes it possible, in the case of very high amplitude vibration regimes, to short-circuit the damper screw as regards the transmission of the dynamic forces between the fixed structure of the nacelle. and the electronic box, and thus to avoid subjecting this screw to efforts likely to lead to ruin.
  • said limiting means are able to limit said stroke in a plane perpendicular to said screw: these limiting means make it possible to eliminate the risks of shearing the screw;
  • Said limiting means are able to limit said stroke in at least one direction of a direction parallel to said screw;
  • said limiting means comprise on the one hand a cup able to be fixed on said fixed structure, and on the other hand an integral impactor of said fixing means and positioned inside said cup, this cup and this impactor being separated.
  • this embodiment cup and impactor provides a very simple way a stroke limitation in the plane perpendicular to the screw and in the direction of compression of the screw; the games are chosen so that no contact between the cup and the impactor is likely to modify the behavior of the damper in nominal stresses;
  • said impactor is coated with an elastomer material on its face intended to cooperate with said cup: this coating makes it possible to limit the intensity of the impacts between the impactor and the cup, in the event of abutment of these two parts, one against the other ;
  • said block of elastic material is shaped as a double cone and said fastening means comprise a fixing washer taken between the two cones of said double cone: this elastic block thus shaped has a high damping efficiency;
  • said impactor is mounted on said fixing means so as to take part of said electronic box in sandwich: this arrangement makes it possible to form a robust connection of the electronic box with the damper;
  • This damper comprises an anti-tearing stop: this stop limits the tearing of the movable part of the damper relative to its fixed part in the exceptional vibration regimes.
  • the present invention also relates to an aircraft nacelle comprising a fixed structure and at least one electronic unit mounted on this fixed structure by means of at least one damper according to the foregoing.
  • FIG. 1 partially and in perspective shows an electronic unit fixed to a fixed structure of aircraft nacelle by means of a vibration damper according to the invention
  • FIG. 2 represents a perspective view of this damper
  • FIG. 3 represents a perspective view of the bowl of this damper
  • FIG. 4 shows in perspective the impactor of this shock absorber
  • - Figure 5 is an axial sectional view of the damper according to the invention, respectively fixed to the electronic housing and to the fixed structure of the nacelle of Figure 1.
  • an electronic box 1 which may include for example electronic components for controlling actuators of an aircraft nacelle.
  • actuators can be used in particular to open moving parts of the nacelle during maintenance operations.
  • the fixed part of this nacelle that is to say the part of this nacelle on which are mounted the moving parts, is partially visible at 3 in Figure 1.
  • the electronic box 1 is fixed on the structure 3 by means of a plurality of dampers, one of which is shown in FIG. 1.
  • this damper comprises a screw 7 traversing, in this order, an anti-tearing stopper 9, a block of elastic material 10, a fixing washer 11, an impactor 13 and a bowl 15, which may also be referred to as a "cup".
  • the anti-tearing stop 9 has a washer-like shape wedged against the head 17 of the screw 7.
  • the anti-tearing stopper 9 comprises a rim of elastomeric material 21.
  • the screw 7 passes through a spacer 23 abutting respectively against the head 17 of this screw and against the bottom of the bowl 15, on which is formed a centering edge 25.
  • the spacer 23 defines a shoulder 27, and the block of elastic material 10 is clamped between the anti-tearing stop 9 and this shoulder 27. More particularly, the block of elastic material 10 has the shape of a double cone, whose two cones facing each other 10a and 10b pinch the fixing washer 11.
  • This washer is itself fixed by at least two screws 29a, 29b on the impactor 13, the electronic box 1 being sandwiched between this fixing washer 11 and this impactor 13.
  • this impactor 13 comprises at its periphery a coating of elastomeric material 31.
  • the bowl 15 is secured to the structure 3, so that all the stresses due to the impacts of the impactor 13 are directly transmitted to this structure 3. Note also that the bottom of the impactor 13 is separated from the bottom of the bowl 15 by a second clearance J2 less than the clearance J'2 separating the fixing washer 11 from the shoulder 27 of the spacer 23.
  • the screw 7 passes through the fixed structure of the nacelle 3, on which it is fixed by means of a nut 33.
  • This stop is damped by the coating of elastomeric material 31 disposed at the periphery of the impactor 13. This stop allows direct transmission, that is to say without passing through the screw 7, the dynamic forces of the bowl 15 to the impactor 13.
  • the screw 7 is thus short-circuited, which makes it possible to avoid subjecting this screw to excessive bending and / or shear forces and, to a lesser extent, to compression, which can cause its fatigue and / or its ruin. It should be noted that providing that the games J1 and J2 are respectively lower than the games J'1 and J'2 makes it possible to ensure that the transmission of the dynamic forces in these extreme situations passes through the impactor 13 and the cuvette 15, which are suitably dimensioned and incorporate damping properties, and not by other more fragile parts of the damper such as the screw 7.
  • the anti-tearing stop 9 makes it possible to limit the travel of the fixing washer 11 in a direction that would lead to tearing of the elastic material block 10. In this particular mode of loading the screw works in tension, its usual and preferred mode. .
  • the damper according to the invention makes it possible to guarantee that, beyond a certain threshold of vibrations, the dynamic forces transmitted by the fixed nacelle structure 3 to the electronic box 1 , no longer pass through the screw 7, to avoid tiring and / or ruining the screw.
  • these sets J1 and J2 are large enough to allow normal operation, that is to say based on the elasticity of the block 10, in normal vibration ranges, and sufficiently small to ensure a transition direct dynamic forces between the bowl 15 and the impactor 13 in case of exceptional vibrations.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Vibration Dampers (AREA)

Abstract

The invention relates to a vibration damper (5) that can be provided between an electronic housing (1) and the fixed structure of an aircraft nacelle (3). It comprises a block of an elastic material (10), a screw (7) for securing the block (10) to said fixed structure (3), and means (11, 29a, 29b) for securing said housing (1) onto said block (10). It is characterised in that it comprises means (13, 15) for limiting the travel of said attachment means (11, 29a, 29b) relative to said securing screw (7) in at least two directions of the space, wherein the limitation means (13, 15) are sized so as to prevent any strain on the screw (7) that could lead to the fatigue and/or breakage thereof.

Description

Amortisseur de vibrations pour nacelle d'aéronef Vibration damper for aircraft nacelle
La présente invention se rapporte à un amortisseur de vibrations pour boîtier installé sur une nacelle d'aéronef. On connaît de la technique antérieure un amortisseur de vibrations apte à être interposé entre un boîtier électronique et une structure fixe de nacelle d'aéronef, comprenant un bloc en matériau élastique, une vis de fixation de ce bloc sur ladite structure fixe, et des moyens de fixation dudit boîtier sur ledit bloc. Le boîtier électronique peut être typiquement un boîtier de commande de différentes fonctions de la nacelle, telle que la fonction d'ouverture d'une partie de nacelle pour des opérations de maintenance.The present invention relates to a vibration damper for a housing installed on an aircraft nacelle. A vibration damper capable of being interposed between an electronic box and a fixed structure of aircraft nacelle, comprising a block made of elastic material, a screw for fixing this block on said fixed structure, and means fixing said housing to said block. The electronic box may typically be a control box for various functions of the nacelle, such as the function of opening a nacelle part for maintenance operations.
Les amortisseurs de vibration permettent de protéger les composants électroniques de ce boîtier vis-à-vis des vibrations engendrées par le turboréacteur situé à l'intérieur de la nacelle.Vibration dampers protect the electronic components of this housing vis-à-vis vibrations generated by the turbojet engine located inside the nacelle.
Lorsqu'une aube du turboréacteur se casse de manière accidentelle (situation connue de l'homme du métier sous l'abréviation anglo- saxonne FBO, pour « Fan Blade Out »), les vibrations engendrées par le turboréacteur atteignent des amplitudes très élevées pouvant conduire notamment à la destruction des amortisseurs, et à la désolidarisation consécutive du boîtier électronique de la structure fixe de la nacelle.When a dawn of the turbojet accidentally breaks (a situation known to the skilled person under the abbreviation Anglo-Saxon FBO for "Fan Blade Out"), the vibrations generated by the turbojet reach very high amplitudes that can lead in particular to the destruction of the dampers, and the subsequent disconnection of the electronic box of the fixed structure of the nacelle.
Une telle désolidarisation est inacceptable, car alors le boîtier électronique est susceptible d'endommager d'autres organes de la nacelle et du moteur. Pour éviter une telle désolidarisation, on vient classiquement placer au-dessus de l'amortisseur un étrier de sécurité que l'on fixe par ses deux extrémités sur la structure fixe de la nacelle.Such disconnection is unacceptable, because then the electronic box is likely to damage other organs of the nacelle and the engine. To avoid such separation, it is classically placed above the damper a safety bracket that is fixed at both ends on the fixed structure of the nacelle.
Un tel étrier permet de retenir l'amortisseur en place lorsqu'il est détruit sous l'effet de vibrations de forte amplitude, et d'éviter ainsi que le boîtier électronique se détache entièrement de la structure fixe de la nacelle.Such a stirrup makes it possible to retain the damper in place when it is destroyed under the effect of vibrations of high amplitude, and thus to avoid that the electronic unit is completely detached from the fixed structure of the nacelle.
Un tel étrier et les fixations qui lui sont associées pèsent un certain poids, ce qui va à rencontre de la recherche permanente de réduction de masse, propre au domaine aéronautique.Such a stirrup and the fasteners associated with it carry a certain weight, which goes against the permanent search for mass reduction, specific to the aeronautical field.
En outre, un tel étrier et ses fixations constituent des pièces supplémentaires que les techniciens de maintenance risquent d'oublier de remonter lors des opérations de remplacement et/ou de maintenance. La présente invention a notamment pour but de remédier à ces inconvénients.In addition, such a bracket and its fasteners are additional parts that maintenance technicians may forget to reassemble during replacement and / or maintenance operations. The present invention is intended to overcome these disadvantages.
On atteint ce but de l'invention avec un amortisseur de vibrations apte à être interposé entre un boîtier électronique et une structure fixe de nacelle d'aéronef, comprenant un bloc en matériau élastique, une vis de fixation de ce bloc sur ladite structure fixe, et des moyens de fixation dudit boîtier sur ledit bloc, remarquable en ce qu'il comprend des moyens pour limiter la course desdits moyens de fixation par rapport à ladite vis de fixation dans au moins deux directions de l'espace, ces moyens de limitation étant dimensionnés pour éviter une sollicitation de ladite vis pouvant conduire à sa fatigue et/ou à sa rupture "^ >This object of the invention is achieved with a vibration damper able to be interposed between an electronic box and a fixed structure of aircraft nacelle, comprising a block of elastic material, a screw for fixing this block on said fixed structure, and means for securing said housing to said block, characterized in that it comprises means for limiting the stroke of said fixing means relative to said fixing screw in at least two directions of space, these limiting means being dimensioned to avoid a biasing of said screw may lead to fatigue and / or rupture "^>
La présenc^ ^s moyens de limitation de course permet, en cas de régimes de vibrations We très forte amplitude, de court-circuiter la vis de l'amortisseur pour ce qui est de la transmission des efforts dynamiques entre la structure fixe de la nacelle et le boîtier électronique, et ainsi d'éviter de soumettre cette vis à des efforts susceptibles de conduire à sa ruine.The presence of stroke limiting means makes it possible, in the case of very high amplitude vibration regimes, to short-circuit the damper screw as regards the transmission of the dynamic forces between the fixed structure of the nacelle. and the electronic box, and thus to avoid subjecting this screw to efforts likely to lead to ruin.
Grâce à ces moyens de limitation de course, on obtient donc un amortisseur qui n'est plus susceptible de se ruiner en cas de régimes de vibration de forte amplitude, pouvant survenir notamment lors d'un FBO (rupture d'aube du turboréacteur) et lors du temps de retour de l'avion consécutif au FBO.Thanks to these stroke limiting means, a damper is thus obtained which is no longer liable to break down in the event of high amplitude vibration regimes, which may occur especially during an FBO (jet engine dawn break) and during the return time of the aircraft following the FBO.
Suivant d'autres caractéristiques optionnelles de l'amortisseur selon l'invention :According to other optional features of the damper according to the invention:
- lesdits moyens de limitation sont aptes à limiter ladite course dans un plan perpendiculaire à ladite vis : ces moyens de limitation permettent de supprimer les risques de cisaillement de la vis ;said limiting means are able to limit said stroke in a plane perpendicular to said screw: these limiting means make it possible to eliminate the risks of shearing the screw;
- lesdits moyens de limitation sont aptes à limiter ladite course dans au moins un sens d'une direction parallèle à ladite vis ;- Said limiting means are able to limit said stroke in at least one direction of a direction parallel to said screw;
- lesdits moyens de limitation comprennent d'une part une coupelle apte à être fixée sur ladite structure fixe, et d'autre part un impacteur solidaire desdits moyens de fixation et positionné à l'intérieur de ladite coupelle, cette coupelle et cet impacteur étant séparés selon les directions perpendiculaire et parallèle à ladite vis par des jeux tels que la sollicitation de ladite vis correspondant à la butée dudit impacteur à l'intérieur de ladite coupelle, soit située en deçà du seuil de fatigue et/ou de rupture de ladite vis : ce mode de réalisation à coupelle et à impacteur permet d'obtenir de manière très simple une limitation de course dans le plan perpendiculaire à la vis et dans le sens d'une compression de la vis ; les jeux sont choisis de telle sorte qu'aucun contact entre la coupelle et l'impacteur ne soit susceptible de modifier le comportement de l'amortisseur en sollicitations nominales ; - ledit impacteur est revêtu d'un matériau élastomère sur sa face destinée à coopérer avec ladite coupelle : ce revêtement permet de limiter l'intensité des chocs entre l'impacteur et la coupelle, en cas de butée de ces deux pièces l'une contre l'autre ;said limiting means comprise on the one hand a cup able to be fixed on said fixed structure, and on the other hand an integral impactor of said fixing means and positioned inside said cup, this cup and this impactor being separated. in the directions perpendicular and parallel to said screw by games such that the biasing of said screw corresponding to the abutment of said impactor inside said cup, is located below the fatigue threshold and / or rupture of said screw: this embodiment cup and impactor provides a very simple way a stroke limitation in the plane perpendicular to the screw and in the direction of compression of the screw; the games are chosen so that no contact between the cup and the impactor is likely to modify the behavior of the damper in nominal stresses; said impactor is coated with an elastomer material on its face intended to cooperate with said cup: this coating makes it possible to limit the intensity of the impacts between the impactor and the cup, in the event of abutment of these two parts, one against the other ;
- ledit bloc en matériau élastique est conformé en double cône et lesdits moyens de fixation comprennent une rondelle de fixation prise entre les deux cônes dudit double cône : ce bloc élastique ainsi conformé présente une grande efficacité d'amortissement ;said block of elastic material is shaped as a double cone and said fastening means comprise a fixing washer taken between the two cones of said double cone: this elastic block thus shaped has a high damping efficiency;
- ledit impacteur est monté sur lesdits moyens de fixation de manière à prendre une partie dudit boîtier électronique en sandwich : cet agencement permet de réaliser une liaison robuste du boîtier électronique avec l'amortisseur ;said impactor is mounted on said fixing means so as to take part of said electronic box in sandwich: this arrangement makes it possible to form a robust connection of the electronic box with the damper;
- cet amortisseur comprend une butée anti-arrachement : cette butée permet de limiter l'arrachement de la partie mobile de l'amortisseur par rapport à sa partie fixe dans les régimes de vibration exceptionnels. La présente invention se rapporte également à une nacelle d'aéronef comprenant une structure fixe et au moins un boîtier électronique monté sur cette structure fixe au moyen d'au moins un amortisseur conforme à ce qui précède.- This damper comprises an anti-tearing stop: this stop limits the tearing of the movable part of the damper relative to its fixed part in the exceptional vibration regimes. The present invention also relates to an aircraft nacelle comprising a fixed structure and at least one electronic unit mounted on this fixed structure by means of at least one damper according to the foregoing.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lumière de la description qui va suivre et à l'examen des figures ci-annexées, dans lesquelles :Other features and advantages of the present invention will emerge in the light of the following description and the examination of the appended figures, in which:
- la figure 1 représente de manière partielle et en perspective un boîtier électronique fixé sur une structure fixe de nacelle d'aéronef au moyen d'un amortisseur de vibrations selon l'invention, - la figure 2 représente une vue en perspective de cet amortisseur,FIG. 1 partially and in perspective shows an electronic unit fixed to a fixed structure of aircraft nacelle by means of a vibration damper according to the invention; FIG. 2 represents a perspective view of this damper,
- la figure 3 représente une vue en perspective de la cuvette de cet amortisseur,FIG. 3 represents a perspective view of the bowl of this damper,
- la figure 4 représente en perspective l'impacteur de cet amortisseur, et - la figure 5 est une vue en coupe axiale de l'amortisseur selon l'invention, fixé respectivement au boîtier électronique et à la structure fixe de la nacelle de la figure 1.FIG. 4 shows in perspective the impactor of this shock absorber, and - Figure 5 is an axial sectional view of the damper according to the invention, respectively fixed to the electronic housing and to the fixed structure of the nacelle of Figure 1.
En se reportant à présent à la figure 1 , on peut voir une partie d'un boîtier électronique 1 , pouvant comprendre par exemple des composants électroniques permettant de commander des actionneurs d'une nacelle d'aéronef.Referring now to Figure 1, one can see a part of an electronic box 1, which may include for example electronic components for controlling actuators of an aircraft nacelle.
Ces actionneurs peuvent être utilisés notamment pour ouvrir des parties mobiles de la nacelle lors d'opérations de maintenance. La partie fixe de cette nacelle, c'est-à-dire la partie de cette nacelle sur laquelle sont montées les parties mobiles, est visible de manière partielle en 3 sur la figure 1.These actuators can be used in particular to open moving parts of the nacelle during maintenance operations. The fixed part of this nacelle, that is to say the part of this nacelle on which are mounted the moving parts, is partially visible at 3 in Figure 1.
Le boîtier électronique 1 est fixé sur la structure 3 au moyen d'une pluralité d'amortisseurs dont l'un 5 est représenté sur la figure 1. En se reportant plus particulièrement aux figures 2 à 4, on peut voir que cet amortisseur comprend une vis 7 traversant, dans cet ordre, une butée anti-arrachement 9, un bloc en matériau élastique 10, une rondelle de fixation 11 , un impacteur 13 et une cuvette 15, qui peut être également désignée par le terme de « coupelle ». En se reportant plus particulièrement à la figure 5, on peut voir que la butée anti-arrachement 9 présente une forme de rondelle calée contre la tête 17 de la vis 7.The electronic box 1 is fixed on the structure 3 by means of a plurality of dampers, one of which is shown in FIG. 1. Referring more particularly to FIGS. 2 to 4, it can be seen that this damper comprises a screw 7 traversing, in this order, an anti-tearing stopper 9, a block of elastic material 10, a fixing washer 11, an impactor 13 and a bowl 15, which may also be referred to as a "cup". Referring more particularly to FIG. 5, it can be seen that the anti-tearing stop 9 has a washer-like shape wedged against the head 17 of the screw 7.
Dans sa partie située en vis-à-vis de la rondelle de fixation 11 , la butée anti-arrachement 9 comporte une bordure en matériau élastomère 21. La vis 7 passe à travers une entretoise 23 venant en butée respectivement contre la tête 17 de cette vis et contre le fond de la cuvette 15, sur lequel est ménagée une bordure de centrage 25.In its part opposite the fixing washer 11, the anti-tearing stopper 9 comprises a rim of elastomeric material 21. The screw 7 passes through a spacer 23 abutting respectively against the head 17 of this screw and against the bottom of the bowl 15, on which is formed a centering edge 25.
L'entretoise 23 définit un épaulement 27, et le bloc en matériau élastique 10 est pincé entre la butée anti-arrachement 9 et cet épaulement 27. Plus particulièrement, le bloc en matériau élastique 10 présente la forme d'un double cône, dont les deux cônes situés en vis-à-vis 10a et 10b viennent pincer la rondelle de fixation 11.The spacer 23 defines a shoulder 27, and the block of elastic material 10 is clamped between the anti-tearing stop 9 and this shoulder 27. More particularly, the block of elastic material 10 has the shape of a double cone, whose two cones facing each other 10a and 10b pinch the fixing washer 11.
Cette rondelle est elle-même fixée par au moins deux vis 29a, 29b sur l'impacteur 13, le boîtier électronique 1 étant pris en sandwich entre cette rondelle de fixation 11 et cet impacteur 13. De préférence, cet impacteur 13 comporte à sa périphérie un revêtement en matériau élastomère 31.This washer is itself fixed by at least two screws 29a, 29b on the impactor 13, the electronic box 1 being sandwiched between this fixing washer 11 and this impactor 13. Preferably, this impactor 13 comprises at its periphery a coating of elastomeric material 31.
L'impacteur 13, qui est disposé à l'intérieur de la cuvette 15, comme cela est visible sur la figure 5, est séparé de cette cuvette, sur toute sa périphérie, d'un premier jeu J1 inférieur au jeu J'1 séparant l'intérieur de l'impacteur 13 de l'entretoise 23.The impactor 13, which is disposed inside the bowl 15, as can be seen in FIG. 5, is separated from this bowl, over its entire periphery, with a first set J1 lower than the set Je1 separating the inside of the impactor 13 of the spacer 23.
La cuvette 15 est solidarisée à la structure 3, de telle sorte que toutes les sollicitations dues aux impacts de l'impacteur 13 soient directement transmises à cette structure 3. On notera par ailleurs que le fond de l'impacteur 13 est séparé du fond de la cuvette 15 par un deuxième jeu J2 inférieur au jeu J'2 séparant la rondelle de fixation 11 de l'épaulement 27 de l'entretoise 23.The bowl 15 is secured to the structure 3, so that all the stresses due to the impacts of the impactor 13 are directly transmitted to this structure 3. Note also that the bottom of the impactor 13 is separated from the bottom of the bowl 15 by a second clearance J2 less than the clearance J'2 separating the fixing washer 11 from the shoulder 27 of the spacer 23.
La vis 7 traverse la structure fixe de la nacelle 3, sur laquelle elle est fixée au moyen d'un écrou 33. Le mode de fonctionnement et les avantages de l'amortisseur qui vient d'être décrit résultent directement de ce qui précède.The screw 7 passes through the fixed structure of the nacelle 3, on which it is fixed by means of a nut 33. The mode of operation and the advantages of the damper which has just been described result directly from the foregoing.
En mode de fonctionnement normal, c'est-à-dire lorsque les vibrations de la nacelle ne dépassent pas un seuil prédéterminé, ces vibrations sont transmises par la structure fixe de la nacelle 3 au boîtier électronique 1 par l'intermédiaire du bloc en matériau élastique 10, l'impacteur 13 pouvant se déplacer librement à l'intérieur de la cuvette 15, tant selon la direction de la vis 7 que dans un plan perpendiculaire à cette vis.In normal operating mode, that is to say when the vibrations of the nacelle do not exceed a predetermined threshold, these vibrations are transmitted by the fixed structure of the nacelle 3 to the electronic box 1 through the block of material elastic 10, the impactor 13 being able to move freely inside the bowl 15, both in the direction of the screw 7 in a plane perpendicular to this screw.
Lorsque les vibrations de la structure fixe de nacelle 3 dépassent ledit seuil prédéterminé, par exemple par suite d'une rupture d'aube du turboréacteur situé à l'intérieur de la nacelle (« Fan Blade Out »), l'impacteurWhen the vibrations of the fixed nacelle structure 3 exceed said predetermined threshold, for example as a result of a dawn rupture of the turbojet engine located inside the nacelle ("Fan Blade Out"), the impactor
13 est susceptible de venir en butée à l'intérieur de la cuvette 15, soit dans la direction du premier jeu J1 , soit dans la direction du deuxième jeu J2.13 is capable of abutting inside the bowl 15, either in the direction of the first set J1, or in the direction of the second set J2.
Cette butée est amortie par le revêtement en matériau élastomère 31 disposé à la périphérie de l'impacteur 13. Cette butée permet une transmission directe, c'est-à-dire sans passer par la vis 7, des efforts dynamiques de la cuvette 15 à l'impacteur 13.This stop is damped by the coating of elastomeric material 31 disposed at the periphery of the impactor 13. This stop allows direct transmission, that is to say without passing through the screw 7, the dynamic forces of the bowl 15 to the impactor 13.
On court-circuite ainsi en quelque sorte la vis 7, ce qui permet d'éviter de soumettre cette vis à des efforts excessifs de flexion et/ou de cisaillement et, dans une moindre mesure, de compression, susceptibles d'entraîner sa fatigue et/ou sa ruine. On notera que le fait de prévoir que les jeux J1 et J2 soient inférieurs respectivement aux jeux J'1 et J'2, permet de s'assurer que la transmission des efforts dynamiques dans ces situations extrêmes passe bien par l'impacteur 13 et la cuvette 15, qui sont dimensionnées de manière appropriée et incorporent des propriétés amortissantes, et non par d'autres pièces plus fragiles de l'amortisseur telles que la vis 7.The screw 7 is thus short-circuited, which makes it possible to avoid subjecting this screw to excessive bending and / or shear forces and, to a lesser extent, to compression, which can cause its fatigue and / or its ruin. It should be noted that providing that the games J1 and J2 are respectively lower than the games J'1 and J'2 makes it possible to ensure that the transmission of the dynamic forces in these extreme situations passes through the impactor 13 and the cuvette 15, which are suitably dimensioned and incorporate damping properties, and not by other more fragile parts of the damper such as the screw 7.
La butée anti-arrachement 9 permet de limiter la course de la rondelle de fixation 11 dans un sens qui conduirait à l'arrachement du bloc en matériau élastique 10. Dans ce mode particulier de sollicitation le vis travaille en traction, son mode habituel et privilégié.The anti-tearing stop 9 makes it possible to limit the travel of the fixing washer 11 in a direction that would lead to tearing of the elastic material block 10. In this particular mode of loading the screw works in tension, its usual and preferred mode. .
Comme on peut le comprendre à la lumière de ce qui précède, l'amortisseur selon l'invention permet de garantir qu'au delà d'un certain seuil de vibrations, les efforts dynamiques transmis par la structure fixe de nacelle 3 au boîtier électronique 1 , ne transitent plus par la vis 7, permettant d'éviter de fatiguer et/ou de ruiner cette vis.As can be understood in the light of the foregoing, the damper according to the invention makes it possible to guarantee that, beyond a certain threshold of vibrations, the dynamic forces transmitted by the fixed nacelle structure 3 to the electronic box 1 , no longer pass through the screw 7, to avoid tiring and / or ruining the screw.
Bien entendu, le dimensionnement des jeux J1 et J2 est effectué en fonction des caractéristiques mécaniques de la vis 7, selon des méthodes classiques à la portée de l'homme du métier.Of course, the sizing of the games J1 and J2 is performed according to the mechanical characteristics of the screw 7, according to conventional methods within the reach of those skilled in the art.
En d'autres termes, ces jeux J1 et J2 sont suffisamment importants pour permettre un fonctionnement normal, c'est-à-dire reposant sur l'élasticité du bloc 10, dans les plages de vibrations normales, et suffisamment petits pour assurer une transition directe des efforts dynamiques entre la cuvette 15 et l'impacteur 13 en cas de vibrations exceptionnelles.In other words, these sets J1 and J2 are large enough to allow normal operation, that is to say based on the elasticity of the block 10, in normal vibration ranges, and sufficiently small to ensure a transition direct dynamic forces between the bowl 15 and the impactor 13 in case of exceptional vibrations.
Du fait de la présence des moyens de limitation de course de la partie mobile de l'amortisseur par rapport à sa partie fixe, on prévient tout risque de destruction de la vis 7 dans les régimes de vibrations exceptionnelles, et il n'est ainsi plus nécessaire de prévoir des moyens supplémentaires de sécurité tels qu'un étrier (comme c'était le cas dans la technique antérieure) pour prévenir le risque de désolidarisation du boîtier électronique 1 de la structure fixe de nacelle 3.Due to the presence of the stroke limiting means of the movable part of the damper relative to its fixed part, it prevents any risk of destruction of the screw 7 in the exceptional vibration regimes, and it is thus no longer it is necessary to provide additional safety means such as a stirrup (as was the case in the prior art) to prevent the risk of disconnection of the electronic unit 1 from the fixed platform structure 3.
Bien entendu, la présente invention n'est nullement limitée aux modes de réalisation décrits et représentés, fournis à titre de simples exemples. Of course, the present invention is not limited to the embodiments described and shown, provided as simple examples.

Claims

REVENDICATIONS
1. Amortisseur de vibrations (5) apte à être interposé entre un boîtier électronique (1) et une structure fixe de nacelle d'aéronef (3), comprenant un bloc en matériau élastique (10), une vis (7) de fixation de ce bloc (10) sur ladite structure fixe (3), et des moyens (11 , 29a, 29b) de fixation dudit boîtier (1) sur ledit bloc (10), caractérisé en ce qu'il comprend des moyens (13, 15) pour limiter la course desdits moyens de fixation (11 , 29a, 29b) par rapport à ladite vis de fixation (7) dans au moins deux directions de l'espace, lesdits moyens de limitation (13, 15) comprenant d'une part une cuvette (15) apte à être fixée sur ladite structure fixe (3), et d'autre part un impacteur (13) se déplaçant librement à l'intérieur de ladite cuvette (15), l'impacteur (13) étant solidaire desdits moyens de fixation (11 , 29a, 29b), et en ce que les moyens de limitation (13, 15) sont dimensionnés pour éviter une sollicitation de ladite vis (7) pouvant conduire à sa fatigue et/ou à sa rupture.Vibration damper (5) adapted to be interposed between an electronic box (1) and a fixed structure of aircraft nacelle (3), comprising a block of elastic material (10), a screw (7) for fixing this block (10) on said fixed structure (3), and means (11, 29a, 29b) for fixing said housing (1) on said block (10), characterized in that it comprises means (13, 15 ) to limit the stroke of said fixing means (11, 29a, 29b) relative to said fixing screw (7) in at least two directions of space, said limiting means (13, 15) comprising on the one hand a bowl (15) adapted to be fixed on said fixed structure (3), and secondly an impactor (13) moving freely inside said bowl (15), the impactor (13) being integral with said fastening means (11, 29a, 29b), and in that the limiting means (13, 15) are sized to avoid a biasing of said screw (7) which can lead to fatigue and / or at break.
2. Amortisseur (5) selon la revendication 1 , caractérisé en ce que lesdits moyens de limitation (13, 15) sont aptes à limiter ladite course dans un plan perpendiculaire à ladite vis (7).2. Shock absorber (5) according to claim 1, characterized in that said limiting means (13, 15) are adapted to limit said stroke in a plane perpendicular to said screw (7).
3. Amortisseur (5) selon l'une des revendications 1 ou 2, caractérisé en ce que lesdits moyens de limitation (13, 15) sont aptes à limiter ladite course dans au moins un sens d'une direction parallèle à ladite vis.3. Shock absorber (5) according to one of claims 1 or 2, characterized in that said limiting means (13, 15) are adapted to limit said stroke in at least one direction of a direction parallel to said screw.
4. Amortisseur (5) selon les revendications 2 et 3, caractérisé en ce que la cuvette (15) et l'impacteur (13) sont séparés selon les directions perpendiculaire et parallèle à ladite vis par des jeux (J1 , J2) tels que la sollicitation de ladite vis (7) correspondant à la butée dudit impacteur (13) à l'intérieur de ladite cuvette (15), soit située en deçà du seuil de fatigue et/ou de rupture de ladite vis (7). 4. Shock absorber (5) according to claims 2 and 3, characterized in that the bowl (15) and the impactor (13) are separated in the directions perpendicular and parallel to said screw by sets (J1, J2) such that the biasing of said screw (7) corresponding to the abutment of said impactor (13) inside said bowl (15), is located below the fatigue threshold and / or breaking of said screw (7).
5. Amortisseur (5) selon la revendication 4, caractérisé en ce que ledit impacteur (13) est revêtu d'un matériau élastomère (31 ) sur sa face destinée à coopérer avec ladite cuvette (15).5. Shock absorber (5) according to claim 4, characterized in that said impactor (13) is coated with an elastomeric material (31) on its face intended to cooperate with said bowl (15).
6. Amortisseur (5) selon l'une des revendications 4 ou 5, caractérisé en ce que ledit impacteur (13) est monté sur lesdits moyens de fixation (11 , 29a, 29b) de manière à prendre une partie dudit boîtier électronique (1) en sandwich. 6. Damper (5) according to one of claims 4 or 5, characterized in that said impactor (13) is mounted on said fixing means (11, 29a, 29b) so as to take a portion of said electronic housing (1 ) in sandwich.
7. Amortisseur (5) selon l'une quelconque des revendications précédentes, caractérisé en qu'il comprend une butée anti-arrachement (9).7. Shock absorber (5) according to any one of the preceding claims, characterized in that it comprises an anti-tearing stop (9).
8. Nacelle d'aéronef comprenant une structure fixe (3) et au moins un boîtier électronique (1) monté sur cette structure fixe (3) au moyen d'au moins un amortisseur (5) conforme à l'une quelconque des revendications précédentes. 8. Aircraft nacelle comprising a fixed structure (3) and at least one electronic unit (1) mounted on this fixed structure (3) by means of at least one damper (5) according to any one of the preceding claims. .
EP08842552A 2007-08-20 2008-08-01 Vibration damper for aircraft nacelle Withdrawn EP2179195A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0705897A FR2920210B1 (en) 2007-08-20 2007-08-20 VIBRATION SHOCK ABSORBER FOR AN AIRCRAFT NACELLE
PCT/FR2008/001150 WO2009053546A2 (en) 2007-08-20 2008-08-01 Vibration damper for aircraft nacelle

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EP2179195A2 true EP2179195A2 (en) 2010-04-28

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US (1) US8979078B2 (en)
EP (1) EP2179195A2 (en)
CN (1) CN101784811B (en)
BR (1) BRPI0813596A2 (en)
CA (1) CA2695150C (en)
FR (1) FR2920210B1 (en)
RU (1) RU2467221C2 (en)
WO (1) WO2009053546A2 (en)

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RU170717U1 (en) * 2016-04-12 2017-05-04 Николай Иванович Подлевский VIBRATION ISOLATING DEVICE
RU186458U1 (en) * 2018-03-05 2019-01-21 Николай Иванович Подлевский VIBRATION ISOLATING SYSTEM
CN109322953A (en) * 2018-11-23 2019-02-12 平湖众力汽车部件有限公司 It is supported on damper

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BRPI0813596A2 (en) 2014-12-30
CA2695150C (en) 2016-05-10
CN101784811A (en) 2010-07-21
CA2695150A1 (en) 2009-04-30
RU2010109775A (en) 2011-09-27
FR2920210A1 (en) 2009-02-27
WO2009053546A3 (en) 2009-06-18
FR2920210B1 (en) 2013-04-26
RU2467221C2 (en) 2012-11-20
US8979078B2 (en) 2015-03-17
WO2009053546A2 (en) 2009-04-30
US20100164153A1 (en) 2010-07-01
CN101784811B (en) 2013-01-02

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