EP2630335A1 - Hydraulic device for changing the pitch of a propeller - Google Patents

Hydraulic device for changing the pitch of a propeller

Info

Publication number
EP2630335A1
EP2630335A1 EP11779773.8A EP11779773A EP2630335A1 EP 2630335 A1 EP2630335 A1 EP 2630335A1 EP 11779773 A EP11779773 A EP 11779773A EP 2630335 A1 EP2630335 A1 EP 2630335A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic device
changing
nut
pitch
yoke
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
EP11779773.8A
Other languages
German (de)
French (fr)
Other versions
EP2630335B1 (en
Inventor
Frédéric Brettes
Alain François Jean LAVIE
Dominique Raulin
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
Original Assignee
SNECMA SAS
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 SNECMA SAS filed Critical SNECMA SAS
Publication of EP2630335A1 publication Critical patent/EP2630335A1/en
Application granted granted Critical
Publication of EP2630335B1 publication Critical patent/EP2630335B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01D7/00—Rotors with blades adjustable in operation; Control thereof
    • 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
    • F04D29/323—Blade mountings adjustable
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
    • 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
    • F05D2260/00—Function
    • F05D2260/50—Kinematic linkage, i.e. transmission of position
    • 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
    • F05D2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05D2260/79—Bearing, support or actuation arrangements therefor

Definitions

  • the present invention relates to a hydraulic device of a propeller pitch change control device.
  • the field of the invention is that of systems provided with a propeller, such as a wind turbine, an industrial fan, but also turbomachines and turbojet engines provided with a fan comprising a plurality of blades or blades at angles of variable setting.
  • a propeller such as a wind turbine, an industrial fan
  • turbomachines and turbojet engines provided with a fan comprising a plurality of blades or blades at angles of variable setting.
  • a turbomachine comprises one or more stages of variable pitch vanes which are mounted between rotor wheels of a compressor. These variable-pitch vanes are carried by the stator of the turbomachine and are adjustable in position about their axis to optimize the flow of gas in the engine of the turbomachine.
  • the variation of the setting of the blades makes it possible to increase the performances and to improve the efficiency of the engine of a turbomachine during all the phases of its operation, from the take-off to the landing.
  • This variable setting also makes it possible to vary the speed of the propeller or the blower to obtain the desired thrust, without modifying that of the turbine, which is generally calibrated at its maximum continuous speed, or even, during landing, to reverse this thrust thus replacing conventional heavy and complex reverse thrust systems.
  • Propeller or fan pitch control devices are hydraulic actuators (jacks driving each of the blade roots) which provide the force necessary to orient the blades in the desired position.
  • Each variable-pitch blade has a cylindrical pivot at each of its ends, these pivots defining the axis of rotation of the blade.
  • the radially outer pivot of the blade is engaged in a chimney cylindrical outer annular casing which is connected by means of a rod to a control ring mounted around the annular housing.
  • the control ring is connected by a lever to a control shaft actuated by a hydraulic cylinder.
  • the control shaft extends parallel to the axis of the housing and can be connected to one or more rings so as to control one or more stages of blades with a single cylinder.
  • the hydraulic cylinder rod is connected to the control shaft by a radial arm integral with the control shaft causing, by linear displacement of the cylinder rod, the rotation of each of the rings around the housing.
  • the rotation of a control ring is transmitted by the corresponding billets to the outer pivots of the blades of a stage rotating them about their axes.
  • the rod of the jack has at its end a yoke for ensuring a connection with a ball joint forming the end of the radial arm integral with the control shaft.
  • the connection between the yoke and the ball joint is ensured by means of a screw-nut connection.
  • the invention aims to solve the problems mentioned above, by proposing a hydraulic blade pitch change device to ensure rapid assembly and / or disassembly of the device, for example during a maintenance operation, while avoiding the dismantling of other neighboring rooms.
  • the invention proposes a hydraulic device for changing the pitch of a helix comprising a piston rod actuated by a hydraulic fluid, said piston rod comprising at its end a clevis adapted to provide a connection for the transmission of the movements of said piston rod for a pitch change of at least one helix, said hydraulic device being characterized in that it comprises a threaded nut held in position on said yoke of said piston rod by holding means, said nut being adapted to cooperate with a threaded rod for making a connection.
  • the disassembly of the hydraulic cylinder for example during a handling operation, is quickly realized not simple unscrewing of the threaded rod for separating the hydraulic cylinder from the control shaft. Disassembly of the cylinder is achieved without disassembly of other neighboring parts despite a complex architecture does not allow access to the clamping nut of the screw-nut connection.
  • the hydraulic propeller pitch change device may also have one or more of the following characteristics, considered individually or in any technically possible combination:
  • said threaded nut is a self-locking nut
  • said holding means are formed by the cooperation of a metal plate secured to said threaded nut and a notch ring secured to said yoke comprising elastic means; adapted to receive and maintain said platinum metal;
  • said elastic means are formed by elastic tabs each comprising at least one notch;
  • said metal plate comprises protuberances capable of cooperating with said notches of said elastic tabs by clipping or stapling;
  • said device comprises means for blocking the rotation of said notched ring with respect to said screed;
  • said threaded nut comprises two tabs projecting radially with respect to the axis of rotation of said threaded nut adapted to cooperate with two openings arranged in said metal plate;
  • said subassembly formed by said metal plate and by said threaded nut comprises means for blocking the rotation of said subassembly with respect to said notched ring;
  • Said hydraulic device is adapted to the change of turbine blade pitch variable blades turbomachine.
  • the invention also relates to a propeller pitch change control device comprising a hydraulic step change device according to the invention.
  • FIG. 1 is a perspective view of a rod of a hydraulic variable pitch pitch changing device according to a first embodiment of the invention
  • FIG. 2 is a perspective view of the piston rod illustrated in Figure 1 secured to a control shaft of a control device;
  • FIG. 3 is an exploded view of a prisoner nut secured to the piston rod illustrated in Figure 1:
  • FIG. 4 is a perspective view of a piston rod of a hydraulic device for changing pitch of variable-pitch vanes according to a second exemplary embodiment.
  • Figure 1 is a perspective view of a piston rod of a hydraulic variable pitch pitch changing device according to a first embodiment of the invention.
  • the hydraulic cylinder 100 is formed by a body 10 and a piston rod 20 actuated by the pressure of a hydraulic fluid flowing inside the body 10 of the cylinder 1 00.
  • the piston rod 20 comprises at its free end a substantially U-shaped yoke 30 which is intended to be connected to the control shaft via a radial arm secured to the control shaft causing, by linear displacement of the rod 20 of the cylinder, the indirect rotation of the blades of the blowers.
  • the yoke 30 comprises two coaxial orifices 32 crossing on either side the branches of the U of the yoke 30.
  • the space 33 formed between the two branches of the U is intended to receive the end of a radial arm 50 of the yoke. control shaft, called a ball joint, as shown in FIG.
  • the yoke 30 comprises a threaded nut 41 held in position by holding means 40.
  • the threaded nut is adapted to cooperate with a threaded rod (not shown) introduced through the orifice 32 of the lower branch of the U.
  • the threaded nut 41 is a self-locking nut.
  • the holding means 40 are formed by:
  • a metal plate 42 formed from a metal sheet and secured to the threaded nut 41 by folding;
  • a metal ring 43 comprising elastic means 44 able to hold the metal plate 42 in position by stapling or clipping.
  • the metal ring 43 has a base
  • the elastic means 44 are arranged in projections relative to the base 47, and at the edge thereof, forming resilient tabs in which notches 48 are arranged of to perform a clip or staple function.
  • the metal ring 43 is secured to the U-shaped yoke for example by shrinking the crimping ring 46 in the hole 32 of the upper branch of the U of the yoke 30.
  • the yoke comprises a face 34 serving as a support for the metal ring 43 is thus performing a function of anti-rotation of the metal ring 43.
  • This face of support 34 is obtained by producing a flat surface on the yoke 30 adapted to form a plane support for the metal ring 43.
  • the metal plate 42 is formed from a flat metal sheet of substantially rectangular shape having two openings, for example of rectangular shape and arranged in parallel manner.
  • the nut 41 comprises a threaded upper part and a base on which two tabs 45 project radially with respect to the axis of rotation of the nut 41, the shape of the tabs 45 being complementary to the shape of the openings of the metal plate. 42.
  • the metal plate 42 is made integral with the nut 41 by folding the lateral edges of the metal sheet on either side of the nut and so that the tabs 45 protruding through the two openings of the metal plate 42.
  • the metal plate 42 is integral with movements of the threaded nut 41.
  • the metal plate 42 also comprises protuberances 49 able to cooperate with the elastic tabs 44 of the metal ring and more precisely with the notches 48 of the elastic tabs 44.
  • the subassembly formed by the nut 41 and the plate 42 is inserted into the metal ring 43, integral with the yoke, until the introduction of the protuberances of the metal plate 42 in the notches 48 of the elastic tabs 44 .
  • the protuberances 49 of the metal plate 42 and the corresponding notches 48 may be of different sizes and shapes from the moment they perform a clipping or stapling function between the plate 42 and the ring 43.
  • the platen-nut subassembly can be detached from the metal ring 43, and more particularly from the elastic tabs 44, by means of a specific tool allowing the elastic tabs 44 to be sufficiently spaced apart to disengage the protuberances 49 from the notches. 48.
  • the nut 41 is made captive, held in position on the yoke 30 while ensuring a certain clearance of operation between the subassembly and the metal ring 43.
  • the operating clearance thus allows the nut 41 to be precisely positioned. by self-centering, depending on the position of the threaded rod and thus be able to perform the screwing function between the nut and the threaded rod.
  • the threaded rod is a calibrated rod which eliminates the play in the orifices 32 of the yoke 30.
  • the orifice 32 of the lower branch of the U comprises a ring 31 whose diameter is also calibrated to receive the calibrated threaded rod (not shown).
  • An additional anti-rotation function is provided between the platen-nut subassembly and the metal ring 43 by positioning between two elastic tabs 44 of the metal ring 43, the tabs 45 projections.
  • the rotation of the platen-nut sub-assembly is blocked on the one hand by the elastic means and on the other by the spacing of the elastic tabs 44 allowing the passage of the tabs 45 projecting and forming lateral stops.
  • Figure 4 is a perspective view of a piston rod of a hydraulic variable pitch vanes step change device according to a second embodiment.
  • the anti-rotation function of the metal ring 143 relative to the yoke 30 is achieved by the particular geometry of the metal ring 143.
  • the metal ring 143 has an outgrowth of material at its base 147 so as to protrude from the bearing face of the yoke 30.
  • the metal ring 143 has a protrusion 150 protruding and directed towards the inside of the yoke 30 adapted to block any displacement by rotation of the metal ring 143 relative to the yoke 30.
  • the invention has been mainly described for a hydraulic device for changing the pitch of blades with variable turbine engine fan timing; however, the invention is also applicable to any system with propellers such as wind turbines, industrial fans or turbojets.

Landscapes

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

Abstract

The present invention relates to a hydraulic device (100) for changing the pitch of a propeller comprising a piston rod (20) actuated by a hydraulic fluid, said piston rod (20) comprising at its end a clevis mount (30) able to provide a connection for transmitting the movements of said piston rod (20) so as to change the pitch of at least one propeller, said hydraulic device being characterized in that it comprises a thread nut (41) held in position on said clevis (30) of said piston rod (20) by retaining means (40), said nut (41) being able to collaborate with a threaded rod in order to provide a connection.

Description

DISPOSITIF HYDRAULIQUE DE CHANGEMENT DE PAS  HYDRAULIC DEVICE FOR CHANGING THE PITCH
D'HELICE  HELIX
La présente invention concerne un dispositif hydraulique d'un dispositif de commande de changement de pas d'hélice. The present invention relates to a hydraulic device of a propeller pitch change control device.
Le domaine de l'invention est celui des systèmes munis d'une hélice, tel qu'une éolienne, un ventilateur industriel, mais aussi les turbomachines et les turboréacteurs munis d'une soufflante comprenant une pluralité d'aubes ou de pales à angles de calage variable.  The field of the invention is that of systems provided with a propeller, such as a wind turbine, an industrial fan, but also turbomachines and turbojet engines provided with a fan comprising a plurality of blades or blades at angles of variable setting.
D'une façon connue, une turbomachine comporte un ou plusieurs étages d'aubes à calage variable qui sont montés entre des roues de rotor d'un compresseur. Ces aubes à calage variable sont portées par le stator de la turbomachine et sont réglables en position autour de leur axe pour optimiser l'écoulement des gaz dans le moteur de la turbomachine. Ainsi, la variation du calage des aubes permet d'augmenter les performances et d'améliorer le rendement du moteur d'une turbomachine durant toutes les phases de son fonctionnement, du décollage à l'atterrissage.  In a known manner, a turbomachine comprises one or more stages of variable pitch vanes which are mounted between rotor wheels of a compressor. These variable-pitch vanes are carried by the stator of the turbomachine and are adjustable in position about their axis to optimize the flow of gas in the engine of the turbomachine. Thus, the variation of the setting of the blades makes it possible to increase the performances and to improve the efficiency of the engine of a turbomachine during all the phases of its operation, from the take-off to the landing.
Ce calage variable permet en outre de faire varier le régime de l'hélice ou de la soufflante pour obtenir la poussée désirée, sans modifier celui de la turbine qui est en général calé à son régime maximum continu, voire, lors de l'atterrissage, d'inverser cette poussée remplaçant ainsi les systèmes conventionnels lourds et complexes d'inversion de poussée.  This variable setting also makes it possible to vary the speed of the propeller or the blower to obtain the desired thrust, without modifying that of the turbine, which is generally calibrated at its maximum continuous speed, or even, during landing, to reverse this thrust thus replacing conventional heavy and complex reverse thrust systems.
Les dispositifs de commande de variation de pas d'hélice ou de soufflante sont des actionneurs hydrauliques (vérins entraînant chacun des pieds d'aubes) qui procurent la force nécessaire pour orienter les aubes dans la position désirée.  Propeller or fan pitch control devices are hydraulic actuators (jacks driving each of the blade roots) which provide the force necessary to orient the blades in the desired position.
Chaque aube à calage variable comporte un pivot cylindrique à chacune de ses extrémités, ces pivots définissant l'axe de rotation de l'aube. Le pivot radialement externe de l'aube est engagé dans une cheminée cylindrique d'un carter annulaire externe qui est relié au moyen d'une biellette à un anneau de commande monté autour du carter annulaire. L'anneau de commande est quant à lui relié par un levier à un arbre de commande actionné par un vérin hydraulique. De façon générale, l'arbre de commande s'étend parallèlement à l'axe du carter et peut être relié à un ou plusieurs anneaux de façon à commander un ou plusieurs étages d'aubes avec un seul vérin. Each variable-pitch blade has a cylindrical pivot at each of its ends, these pivots defining the axis of rotation of the blade. The radially outer pivot of the blade is engaged in a chimney cylindrical outer annular casing which is connected by means of a rod to a control ring mounted around the annular housing. The control ring is connected by a lever to a control shaft actuated by a hydraulic cylinder. In general, the control shaft extends parallel to the axis of the housing and can be connected to one or more rings so as to control one or more stages of blades with a single cylinder.
La tige du vérin hydraulique est reliée à l'arbre de commande par un bras radial solidaire de l'arbre de commande provoquant, par déplacement linéaire de la tige du vérin, la rotation de chacun des anneaux autour du carter. La rotation d'un anneau de commande est transmise par les billettes correspondantes aux pivots externes des aubes d'un étage les faisant tourner autour de leurs axes.  The hydraulic cylinder rod is connected to the control shaft by a radial arm integral with the control shaft causing, by linear displacement of the cylinder rod, the rotation of each of the rings around the housing. The rotation of a control ring is transmitted by the corresponding billets to the outer pivots of the blades of a stage rotating them about their axes.
La tige du vérin comporte à son extrémité une chape permettant d'assurer une liaison avec une rotule formant l'extrémité du bras radial solidaire de l'arbre de commande. La liaison entre la chape et la rotule est assurée au moyen d'une liaison vis-écrou.  The rod of the jack has at its end a yoke for ensuring a connection with a ball joint forming the end of the radial arm integral with the control shaft. The connection between the yoke and the ball joint is ensured by means of a screw-nut connection.
En fonction des contraintes de volume et d'architecture de la soufflante, il arrive que l'environnement proche du vérin hydraulique n'offre que le volume nécessaire à l'écrou ainsi qu'à sa cinématique lors du fonctionnement du vérin hydraulique. Ce volume n'est par conséquent pas suffisant pour pouvoir installer, positionner, ou encore maintenir correctement l'écrou lors des opérations de montage ou démontage du vérin hydraulique par exemple lors des opérations de maintenance.  Depending on the constraints of volume and architecture of the fan, it happens that the environment close to the hydraulic cylinder offers only the volume required for the nut and its kinematics during operation of the hydraulic cylinder. This volume is therefore not sufficient to install, position, or maintain the nut correctly during assembly or disassembly of the hydraulic cylinder for example during maintenance operations.
Ainsi, durant les opérations de manutention du vérin hydraulique, l'opérateur se trouve dans la nécessité de démonter différentes pièces avoisinantes afin de libérer un espace suffisamment important pour que l'opérateur puisse accéder à l'écrou de la liaison vis-écrou et ainsi pouvoir le manipuler et le démonter aisément. Dans ce contexte, l'invention vise à résoudre les problèmes mentionnés ci-dessus, en proposant un dispositif hydraulique de changement de pas d'aubes permettant d'assurer un montage et/ou un démontage rapide du dispositif, par exemple lors d'une opération de maintenance, tout en s'affranchissant du démontage d'autres pièces avoisinantes. Thus, during the handling operations of the hydraulic cylinder, the operator is in the need to dismantle different neighboring parts in order to free a space large enough for the operator to access the nut of the screw-nut connection and thus be able to handle and dismount it easily. In this context, the invention aims to solve the problems mentioned above, by proposing a hydraulic blade pitch change device to ensure rapid assembly and / or disassembly of the device, for example during a maintenance operation, while avoiding the dismantling of other neighboring rooms.
A cette fin, l'invention propose un dispositif hydraulique de changement de pas d'hélice comportant une tige de piston actionnée par un fluide hydraulique, ladite tige de piston comportant à son extrémité une chape apte à assurer une liaison pour la transmission des mouvements de ladite tige de piston en vue d'un changement de pas d'au moins une hélice, ledit dispositif hydraulique étant caractérisé en ce qu'il comporte un écrou fileté maintenu en position sur ladite chape de ladite tige de piston par des moyens de maintien, ledit écrou étant apte à coopérer avec une tige filetée pour réaliser une liaison.  To this end, the invention proposes a hydraulic device for changing the pitch of a helix comprising a piston rod actuated by a hydraulic fluid, said piston rod comprising at its end a clevis adapted to provide a connection for the transmission of the movements of said piston rod for a pitch change of at least one helix, said hydraulic device being characterized in that it comprises a threaded nut held in position on said yoke of said piston rod by holding means, said nut being adapted to cooperate with a threaded rod for making a connection.
Grâce à l'invention, le démontage du vérin hydraulique, par exemple lors d'une opération de manutention, est réalisé rapidement pas simple dévissage de la tige filetée permettant de désolidariser le vérin hydraulique de l'arbre de commande. Le démontage du vérin est réalisé sans démontage d'autres pièces avoisinantes malgré une architecture complexe n'autorisant pas un accès à l'écrou de serrage de la liaison vis-écrou.  Thanks to the invention, the disassembly of the hydraulic cylinder, for example during a handling operation, is quickly realized not simple unscrewing of the threaded rod for separating the hydraulic cylinder from the control shaft. Disassembly of the cylinder is achieved without disassembly of other neighboring parts despite a complex architecture does not allow access to the clamping nut of the screw-nut connection.
Le dispositif hydraulique de changement de pas d'hélice selon l'invention peut également présenter une ou plusieurs des caractéristiques ci-dessous, considérées individuellement ou selon toutes les combinaisons techniquement possibles :  The hydraulic propeller pitch change device according to the invention may also have one or more of the following characteristics, considered individually or in any technically possible combination:
- ledit écrou fileté est un écrou auto-freinant ;  said threaded nut is a self-locking nut;
- lesdits moyens de maintien sont formés par la coopération d'une platine métallique solidaire dudit écrou fileté et d'une bague à encoches solidaire de ladite chape comportant des moyens élastiques aptes à recevoir et à maintenir ladite platine métallique ; said holding means are formed by the cooperation of a metal plate secured to said threaded nut and a notch ring secured to said yoke comprising elastic means; adapted to receive and maintain said platinum metal;
- lesdits moyens élastiques sont formés par des pattes élastiques comportant chacune au moins une encoche ;  said elastic means are formed by elastic tabs each comprising at least one notch;
- ladite platine métallique comporte des protubérances aptes à coopérer avec lesdites encoches desdites pattes élastiques par clipsage ou par agrafage ;  said metal plate comprises protuberances capable of cooperating with said notches of said elastic tabs by clipping or stapling;
- ledit dispositif comporte des moyens pour bloquer la rotation de ladite bague à encoches par rapport à ladite chape ;  said device comprises means for blocking the rotation of said notched ring with respect to said screed;
- ledit écrou fileté comporte deux pattes faisant saillies radialement par rapport à l'axe de rotation dudit écrou fileté aptes à coopérer avec deux ouvertures agencées dans ladite platine métallique ;  said threaded nut comprises two tabs projecting radially with respect to the axis of rotation of said threaded nut adapted to cooperate with two openings arranged in said metal plate;
- ledit sous-ensemble formé par ladite platine métallique et par ledit écrou fileté comporte des moyens pour bloquer la rotation dudit sous- ensemble par rapport à ladite bague à encoches ;  said subassembly formed by said metal plate and by said threaded nut comprises means for blocking the rotation of said subassembly with respect to said notched ring;
- ledit dispositif hydraulique est apte au changement de pas d'aubes à calage variable de soufflante de turbomachine.  - Said hydraulic device is adapted to the change of turbine blade pitch variable blades turbomachine.
L'invention a également pour objet un dispositif de commande de changement de pas d'hélice comportant un dispositif hydraulique de changement de pas selon l'invention.  The invention also relates to a propeller pitch change control device comprising a hydraulic step change device according to the invention.
D'autres caractéristiques et avantages de l'invention ressortiront plus clairement de la description qui en est donnée ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles :  Other features and advantages of the invention will emerge more clearly from the description which is given below, by way of indication and in no way limitative, with reference to the appended figures, among which:
- la figure 1 est une vue en perspective d'une tige d'un dispositif hydraulique de changement de pas d'aubes à calage variable selon un premier exemple de réalisation de l'invention ; - Figure 1 is a perspective view of a rod of a hydraulic variable pitch pitch changing device according to a first embodiment of the invention;
- la figure 2 est une vue en perspective de la tige de piston illustrée à la figure 1 solidarisée à un arbre de commande d'un dispositif de commande ; - Figure 2 is a perspective view of the piston rod illustrated in Figure 1 secured to a control shaft of a control device;
- la figure 3 est une vue éclatée d'un écrou prisonnier solidarisée sur la tige de piston illustrée à la figure 1 : FIG. 3 is an exploded view of a prisoner nut secured to the piston rod illustrated in Figure 1:
- la figure 4 est une vue en perspective d'une tige de piston d'un dispositif hydraulique de changement de pas d'aubes à calage variable selon un deuxième exemple de réalisation.  FIG. 4 is a perspective view of a piston rod of a hydraulic device for changing pitch of variable-pitch vanes according to a second exemplary embodiment.
Dans toutes les figures, les éléments communs portent les mêmes numéros de référence sauf précision contraire.  In all the figures, the common elements bear the same reference numbers unless otherwise specified.
La figure 1 est une vue en perspective d'une tige de piston d'un dispositif hydraulique de changement de pas d'aubes à calage variable selon un premier exemple de réalisation de l'invention.  Figure 1 is a perspective view of a piston rod of a hydraulic variable pitch pitch changing device according to a first embodiment of the invention.
De façon connue, le vérin hydraulique 100 est formé par un corps 10 et par une tige de piston 20 actionnée par la pression d'un fluide hydraulique circulant à l'intérieur du corps 10 du vérin 1 00.  In known manner, the hydraulic cylinder 100 is formed by a body 10 and a piston rod 20 actuated by the pressure of a hydraulic fluid flowing inside the body 10 of the cylinder 1 00.
La tige de piston 20 comporte à son extrémité libre une chape 30 sensiblement en forme de U qui est destinée à être reliée à l'arbre de commande via un bras radial solidaire de l'arbre de commande provoquant, par déplacement linéaire de la tige 20 du vérin, la rotation indirecte des aubes de la soufflantes.  The piston rod 20 comprises at its free end a substantially U-shaped yoke 30 which is intended to be connected to the control shaft via a radial arm secured to the control shaft causing, by linear displacement of the rod 20 of the cylinder, the indirect rotation of the blades of the blowers.
La chape 30 comporte deux orifices 32 coaxiaux traversant de part et d'autre les branches du U de la chape 30. L'espace 33 formé entre les deux branches du U est destiné à recevoir l'extrémité d'un bras radial 50 de l'arbre de commande, appelé rotule, tel qu'illustré à la figure 2.  The yoke 30 comprises two coaxial orifices 32 crossing on either side the branches of the U of the yoke 30. The space 33 formed between the two branches of the U is intended to receive the end of a radial arm 50 of the yoke. control shaft, called a ball joint, as shown in FIG.
Sur la face extérieure de la branche supérieure du U illustrée à la figure 1 , la chape 30 comporte un écrou fileté 41 maintenu en position par des moyens de maintien 40. L'écrou fileté est apte à coopérer avec une tige filetée (non représentée) introduite au travers de l'orifice 32 de la branche inférieure du U. De façon préférentielle, l'écrou fileté 41 est un écrou auto- freinant.  On the outer face of the upper leg of the U illustrated in Figure 1, the yoke 30 comprises a threaded nut 41 held in position by holding means 40. The threaded nut is adapted to cooperate with a threaded rod (not shown) introduced through the orifice 32 of the lower branch of the U. Preferably, the threaded nut 41 is a self-locking nut.
Les moyens de maintien 40 sont formés par :  The holding means 40 are formed by:
- une platine métallique 42 formée à partir d'une tôle métallique et rendu solidaire à l'écrou fileté 41 par pliage ; a metal plate 42 formed from a metal sheet and secured to the threaded nut 41 by folding;
- une bague métallique 43 comportant des moyens élastiques 44 aptes à maintenir en position la platine métallique 42 par agrafage ou par clipsage.  a metal ring 43 comprising elastic means 44 able to hold the metal plate 42 in position by stapling or clipping.
Tel qu'illustré à la figure 3, la bague métallique 43 présente une base As illustrated in FIG. 3, the metal ring 43 has a base
47 sensiblement perpendiculaire comportant un orifice apte à recevoir une bague de sertissage 46. Les moyens élastiques 44 sont agencés en saillies par rapport à la base 47, et en bordure de celle-ci, formant des pattes élastiques dans lesquelles des encoches 48 sont agencées de façon à réaliser une fonction de clipsage ou d'agrafage. 47 substantially perpendicular having an orifice adapted to receive a crimping ring 46. The elastic means 44 are arranged in projections relative to the base 47, and at the edge thereof, forming resilient tabs in which notches 48 are arranged of to perform a clip or staple function.
La bague métallique 43 est solidarisée sur la chape en forme de U par exemple par frettage de la bague de sertissage 46 dans l'orifice 32 de la branche supérieure du U de la chape 30.  The metal ring 43 is secured to the U-shaped yoke for example by shrinking the crimping ring 46 in the hole 32 of the upper branch of the U of the yoke 30.
Selon le premier mode de réalisation de l'invention illustré à la figure 1 , la chape comporte une face 34 servant d'appui à la bague métallique 43 est réalisant ainsi une fonction d'anti-rotation de la bague métallique 43. Cette face d'appui 34 est obtenue par la réalisation d'un méplat sur la chape 30 apte à former un appui plan pour la bague métallique 43.  According to the first embodiment of the invention illustrated in Figure 1, the yoke comprises a face 34 serving as a support for the metal ring 43 is thus performing a function of anti-rotation of the metal ring 43. This face of support 34 is obtained by producing a flat surface on the yoke 30 adapted to form a plane support for the metal ring 43.
La platine métallique 42 est formée à partir d'une tôle métallique plane de forme sensiblement rectangulaire comportant deux ouvertures, par exemple de forme rectangulaire et disposées de façon parallèle.  The metal plate 42 is formed from a flat metal sheet of substantially rectangular shape having two openings, for example of rectangular shape and arranged in parallel manner.
L'écrou 41 comporte un partie supérieure filetée et une base sur laquelle deux pattes 45 font saillies radialement par rapport à l'axe de rotation de l'écrou 41 , la forme des pattes 45 étant complémentaires de la forme des ouvertures de la platine métallique 42.  The nut 41 comprises a threaded upper part and a base on which two tabs 45 project radially with respect to the axis of rotation of the nut 41, the shape of the tabs 45 being complementary to the shape of the openings of the metal plate. 42.
La platine métallique 42 est rendue solidaire de l'écrou 41 par pliage des bords latéraux de la tôle métallique de part et d'autre de l'écrou et de sorte que les pattes 45 faisant saillies traversent les deux ouvertures de la platine métallique 42. Ainsi, la platine métallique 42 est solidaire des mouvements de l'écrou fileté 41 . The metal plate 42 is made integral with the nut 41 by folding the lateral edges of the metal sheet on either side of the nut and so that the tabs 45 protruding through the two openings of the metal plate 42. Thus, the metal plate 42 is integral with movements of the threaded nut 41.
La platine métallique 42 comporte également des protubérances 49 aptes à coopérer avec les pattes élastiques 44 de la bague métallique et plus précisément avec les encoches 48 des pattes élastiques 44.  The metal plate 42 also comprises protuberances 49 able to cooperate with the elastic tabs 44 of the metal ring and more precisely with the notches 48 of the elastic tabs 44.
Ainsi, le sous-ensemble formé par l'écrou 41 et la platine 42 est inséré dans la bague métallique 43, solidaire de la chape, jusqu'à l'introduction des protubérances de la platine métallique 42 dans les encoches 48 des pattes élastiques 44.  Thus, the subassembly formed by the nut 41 and the plate 42 is inserted into the metal ring 43, integral with the yoke, until the introduction of the protuberances of the metal plate 42 in the notches 48 of the elastic tabs 44 .
Les protubérances 49 de la platine métallique 42 et les encoches 48 correspondantes peuvent être de tailles et de formes différentes à partir du moment où elles réalisent une fonction de clipsage ou d'agrafage entre la platine 42 et la bague 43.  The protuberances 49 of the metal plate 42 and the corresponding notches 48 may be of different sizes and shapes from the moment they perform a clipping or stapling function between the plate 42 and the ring 43.
Bien entendu, le sous-ensemble platine-écrou peut être désolidarisé de la bague métallique 43, et plus particulièrement des pattes élastiques 44, au moyen d'un outil spécifique permettant d'écarter suffisamment les pattes élastiques 44 pour désengager les protubérances 49 des encoches 48.  Of course, the platen-nut subassembly can be detached from the metal ring 43, and more particularly from the elastic tabs 44, by means of a specific tool allowing the elastic tabs 44 to be sufficiently spaced apart to disengage the protuberances 49 from the notches. 48.
Ainsi, l'écrou 41 est rendu imperdable, maintenu en position sur la chape 30 tout en garantissant un certain jeu de fonctionnement entre le sous-ensemble et la bague métallique 43. Le jeu de fonctionnement permet ainsi de placer précisément l'écrou 41 , par auto-centrage, en fonction de la position de la tige filetée et ainsi pouvoir réaliser la fonction de vissage entre l'écrou et la tige filetée. En effet, la tige filetée est une tige calibrée qui permet de supprimer les jeux dans les orifices 32 de la chape 30.  Thus, the nut 41 is made captive, held in position on the yoke 30 while ensuring a certain clearance of operation between the subassembly and the metal ring 43. The operating clearance thus allows the nut 41 to be precisely positioned. by self-centering, depending on the position of the threaded rod and thus be able to perform the screwing function between the nut and the threaded rod. Indeed, the threaded rod is a calibrated rod which eliminates the play in the orifices 32 of the yoke 30.
A cet effet, l'orifice 32 de la branche inférieure du U comporte une bague 31 dont le diamètre est également calibré pour recevoir la tige filetée calibrée (non représentée).  For this purpose, the orifice 32 of the lower branch of the U comprises a ring 31 whose diameter is also calibrated to receive the calibrated threaded rod (not shown).
Une fonction supplémentaire d'anti-rotation est assurée entre le sous- ensemble platine-écrou et la bague métallique 43 par positionnement entre deux pattes élastiques 44 de la bague métallique 43 les pattes 45 faisant saillies. Ainsi la rotation du sous-ensemble platine-écrou est bloquée d'une part par les moyens élastiques et d'autre part par l'espacement des pattes élastiques 44 autorisant le passage des pattes 45 faisant saillies et formant des butées latérales. An additional anti-rotation function is provided between the platen-nut subassembly and the metal ring 43 by positioning between two elastic tabs 44 of the metal ring 43, the tabs 45 projections. Thus the rotation of the platen-nut sub-assembly is blocked on the one hand by the elastic means and on the other by the spacing of the elastic tabs 44 allowing the passage of the tabs 45 projecting and forming lateral stops.
La figure 4 est une vue en perspective d'une tige de piston d'un dispositif hydraulique de changement de pas d'aubes à calage variable selon un deuxième exemple de réalisation.  Figure 4 is a perspective view of a piston rod of a hydraulic variable pitch vanes step change device according to a second embodiment.
Dans ce deuxième exemple de réalisation, la fonction anti-rotation de la bague métallique 143 par rapport à la chape 30 est réalisée par la géométrie particulière de la bague métallique 143.  In this second embodiment, the anti-rotation function of the metal ring 143 relative to the yoke 30 is achieved by the particular geometry of the metal ring 143.
A cet effet, la bague métallique 143 comporte une excroissance de matière au niveau de sa base 147 de façon à déborder de la face d'appui de la chape 30. Au niveau de cette excroissance de matière, la bague métallique 143 comporte une protubérance 150 faisant saillie et dirigée vers l'intérieur de la chape 30 apte à bloquer tout déplacement par rotation de la bague métallique 143 par rapport à la chape 30.  For this purpose, the metal ring 143 has an outgrowth of material at its base 147 so as to protrude from the bearing face of the yoke 30. At the level of this protrusion of material, the metal ring 143 has a protrusion 150 protruding and directed towards the inside of the yoke 30 adapted to block any displacement by rotation of the metal ring 143 relative to the yoke 30.
L'invention a été principalement décrite pour un dispositif hydraulique de changement de pas d'aubes à calage variable de soufflante de turbomachine ; toutefois, l'invention est également applicable à tout système muni d'hélices tel que les éoliennes, les ventilateurs industriels ou encore les turboréacteurs.  The invention has been mainly described for a hydraulic device for changing the pitch of blades with variable turbine engine fan timing; however, the invention is also applicable to any system with propellers such as wind turbines, industrial fans or turbojets.
Les autres avantages de l'invention sont notamment les suivants :  Other advantages of the invention include the following:
- réduction des coûts de réalisation ;  - reduction of implementation costs;
- réduction du temps de réalisation ;  - reduction of the production time;
- simplification de la gamme de fabrication ;  - simplification of the manufacturing range;
- réduction des coûts des outillages ;  - reduction of tooling costs;
- réduction des coûts matière.  - reduction of material costs.

Claims

REVENDICATIONS
Dispositif hydraulique (100) de changement de pas d'hélice comportant une tige de piston (20) actionnée par un fluide hydraulique, ladite tige de piston (20) comportant à son extrémité une chape (30) apte à assurer une liaison pour la transmission des mouvements de ladite tige de piston (20) en vue d'un changement de pas d'au moins une hélice, ledit dispositif hydraulique étant caractérisé en ce qu'il comporte un écrou fileté (41 ) maintenu en position sur ladite chape (30) de ladite tige de piston (20) par des moyens de maintien (40), ledit écrou (41 ) étant apte à coopérer avec une tige filetée pour réaliser une liaison. Hydraulic device (100) for changing propeller pitch comprising a piston rod (20) actuated by a hydraulic fluid, said piston rod (20) comprising at its end a yoke (30) capable of providing a connection for transmission movements of said piston rod (20) with a view to changing the pitch of at least one propeller, said hydraulic device being characterized in that it comprises a threaded nut (41) held in position on said yoke (30). ) of said piston rod (20) by holding means (40), said nut (41) being able to cooperate with a threaded rod to create a connection.
Dispositif hydraulique (100) de changement de pas d'hélice selon la revendication 1 caractérisé en ce que ledit écrou fileté (41 ) est un écrou auto-freinant. Hydraulic device (100) for changing propeller pitch according to claim 1 characterized in that said threaded nut (41) is a self-locking nut.
Dispositif hydraulique (100) de changement de pas d'hélice selon l'une des revendications 1 à 2 caractérisé en ce que lesdits moyens de maintien sont formés par la coopération d'une platine métallique (42) solidaire dudit écrou fileté (41 ) et d'une bague à encoches (43) solidaire de ladite chape (30) comportant des moyens élastiques (44) aptes à recevoir et à maintenir ladite platine métallique (42). Hydraulic device (100) for changing propeller pitch according to one of claims 1 to 2 characterized in that said holding means are formed by the cooperation of a metal plate (42) secured to said threaded nut (41) and a notched ring (43) secured to said yoke (30) comprising elastic means (44) capable of receiving and holding said metal plate (42).
Dispositif hydraulique (100) de changement de pas d'hélice selon la revendication 3 caractérisé en ce que lesdits moyens élastiques sont formés par des pattes élastiques (44) comportant chacune au moins une encoche (48). Dispositif hydraulique (100) de changement de pas d'hélice selon la revendication 4 caractérisé en ce que ladite platine métallique (42) comporte des protubérances (49) aptes à coopérer avec lesdites encoches (48) desdites pattes élastiques (44) par clipsage ou par agrafage. Hydraulic device (100) for changing propeller pitch according to claim 3 characterized in that said elastic means are formed by elastic tabs (44) each comprising at least one notch (48). Hydraulic device (100) for changing propeller pitch according to claim 4 characterized in that said metal plate (42) comprises protuberances (49) capable of cooperating with said notches (48) of said elastic tabs (44) by clipping or by stapling.
Dispositif hydraulique (100) de changement de pas d'hélice selon l'une des revendications 1 à 5 caractérisé en ce qu'il comporte des moyens (34, 150) pour bloquer la rotation de ladite bague à encoches (43) par rapport à ladite chape (30). Hydraulic device (100) for changing propeller pitch according to one of claims 1 to 5 characterized in that it comprises means (34, 150) for blocking the rotation of said notched ring (43) relative to said yoke (30).
Dispositif hydraulique (100) de changement de pas d'hélice selon l'une des revendications 1 à 6 caractérisé en ce que ledit écrou fileté (41 ) comporte deux pattes (45) faisant saillies radialement par rapport à l'axe de rotation dudit écrou fileté (41 ) aptes à coopérer avec deux ouvertures agencées dans ladite platine métallique (42). Hydraulic device (100) for changing propeller pitch according to one of claims 1 to 6 characterized in that said threaded nut (41) comprises two tabs (45) projecting radially relative to the axis of rotation of said nut threaded (41) capable of cooperating with two openings arranged in said metal plate (42).
Dispositif hydraulique (100) de changement de pas d'hélice selon l'une des revendications 1 à 7 caractérisé en ce que le sous- ensemble formé par ladite platine métallique (42) et par ledit écrou fileté (41 ) comporte des moyens (45) pour bloquer la rotation dudit sous-ensemble par rapport à ladite bague à encoches (43). Hydraulic device (100) for changing propeller pitch according to one of claims 1 to 7 characterized in that the subassembly formed by said metal plate (42) and by said threaded nut (41) comprises means (45 ) to block the rotation of said subassembly relative to said notched ring (43).
Dispositif hydraulique (100) de changement de pas d'hélice selon l'une des revendications 1 à 8 caractérisé en ce que ledit dispositif hydraulique (100) est apte au changement de pas d'aubes à calage variable de soufflante de turbomachine. Hydraulic device (100) for changing the pitch of a propeller according to one of Claims 1 to 8, characterized in that said hydraulic device (100) is suitable for changing the pitch of variable-pitch blades of a turbomachine fan.
10. Dispositif de commande de changement de pas d'hélice caractérisé en ce qu'il comporte un dispositif hydraulique selon l'une des revendications 1 à 9. 10. Propeller pitch change control device characterized in that it comprises a hydraulic device according to one of claims 1 to 9.
EP11779773.8A 2010-10-21 2011-09-30 Hydraulic device for changing the pitch of a propeller Active EP2630335B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1058594A FR2966426B1 (en) 2010-10-21 2010-10-21 HYDRAULIC DEVICE FOR CHANGING PROPELLER PITCH
PCT/FR2011/052290 WO2012052649A1 (en) 2010-10-21 2011-09-30 Hydraulic device for changing the pitch of a propeller

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EP2630335A1 true EP2630335A1 (en) 2013-08-28
EP2630335B1 EP2630335B1 (en) 2017-01-04

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EP (1) EP2630335B1 (en)
CN (1) CN103210183B (en)
BR (1) BR112013009848A2 (en)
CA (1) CA2815337A1 (en)
FR (1) FR2966426B1 (en)
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FR2992696B1 (en) * 2012-06-28 2015-04-10 Eurocopter France HYDRAULIC DISPENSER, DEVICE FOR ADJUSTING BLADE PITCH, AIRCRAFT PROVIDED WITH SUCH A HYDRAULIC DISPENSER
FR3046408B1 (en) * 2016-01-05 2018-02-09 Safran Aircraft Engines DEVICE FOR LOCKING THE FLAGS AND FLOWING BLADES OF REGULATLY ORIENTED BLOWER BLADES OF A TURBOMACHINE PROPELLER
CN106938695B (en) * 2017-01-19 2023-08-15 飞灵智控(北京)科技有限公司 Rotor hub and unmanned helicopter
CN114962328B (en) * 2022-07-25 2023-01-06 沈阳鼓风机集团股份有限公司 Axial-flow type main driving compressor for continuous wind tunnel device

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FR2794801B1 (en) * 1999-06-10 2001-07-06 Snecma PROTECTIVE DEVICE FOR THE CONTROL MECHANISM OF THE SHUTTERS OF A TURBOEACTOR INPUT STEERING WHEEL
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FR2911644B1 (en) * 2007-01-23 2012-06-01 Snecma TURBOPROPULSEUR COMPRISING A PROPELLED PROPELLER OF BLADES WITH ADJUSTABLE ORIENTATION.
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FR2966426B1 (en) 2012-12-07
CA2815337A1 (en) 2012-04-26
RU2013123058A (en) 2014-11-27
US20130199167A1 (en) 2013-08-08
WO2012052649A1 (en) 2012-04-26
CN103210183B (en) 2015-11-25
US9879552B2 (en) 2018-01-30
FR2966426A1 (en) 2012-04-27
CN103210183A (en) 2013-07-17
BR112013009848A2 (en) 2016-07-26
EP2630335B1 (en) 2017-01-04

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