EP2766612A1 - Two-stage servovalve and control stage suited to such a servovalve - Google Patents

Two-stage servovalve and control stage suited to such a servovalve

Info

Publication number
EP2766612A1
EP2766612A1 EP12769114.5A EP12769114A EP2766612A1 EP 2766612 A1 EP2766612 A1 EP 2766612A1 EP 12769114 A EP12769114 A EP 12769114A EP 2766612 A1 EP2766612 A1 EP 2766612A1
Authority
EP
European Patent Office
Prior art keywords
feedback
servovalve
movable
power distribution
clamping means
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
EP12769114.5A
Other languages
German (de)
French (fr)
Other versions
EP2766612B1 (en
EP2766612B8 (en
Inventor
Guylain Ozzello
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 Aerosystems Hydraulics SAS
Original Assignee
IN LHC 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 IN LHC SAS filed Critical IN LHC SAS
Publication of EP2766612A1 publication Critical patent/EP2766612A1/en
Publication of EP2766612B1 publication Critical patent/EP2766612B1/en
Application granted granted Critical
Publication of EP2766612B8 publication Critical patent/EP2766612B8/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0436—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being of the steerable jet type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/06—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by means using a fluid jet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/06—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by means using a fluid jet
    • F15B9/07—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by means using a fluid jet with electrical control means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y10T137/2409—With counter-balancing pressure feedback to the modulating device

Definitions

  • the invention relates to a servovalve control stage, which can serve as a first stage in a two - stage servovalve.
  • a conventional servovalve consists of a control stage controlling a mobile power distribution device ⁇ tion of a power stage.
  • the function of the power stage is to deliver a pressure or a flow proportional to an instruction transmitted to the control stage.
  • the control stage comprises two hy ⁇ hydraulic elements, namely a hydraulic transmitter (nozzle or ejector) and a hydraulic receiver (pallet, defl ⁇ tor or fixed receiver) whose modification of their relative position generates pressure differentials which are operated to finely move a movable power distribution member of the power stage of the servovalve.
  • This movable member of distribution then ⁇ slide defect in a cylindrical sleeve implanted in the body of the servovalve.
  • the position of the transmitter or of the hydraulic receiver is controlled by a torque motor that moves one of the elements of the hydrauli c ⁇ pilot stage next to the other.
  • the displacement of the mobile power distribution member in its liner then communicates a set of bored channels and lights whose arrangement makes it possible to deliver a pressure or a flow, proportional to the displacement of said movable member. distribution and ⁇ failure.
  • These servovalves comprise a mechanical connection between the rotor of the torque motor and the mobile power distribution member, made using a device of feedback.
  • the feedback member is generally connected to the movable power distribution member in the middle thereof and is also connected to the hydraulic element associated with the rotor via the latter.
  • the feedback member slaves the position of the movable power distribution member to the rotor of the servovalve and generates on the torque motor a torque which is withdrawn from the control action.
  • the feedback member comprises a rod or a flexible blade operably connected to the rotor at one end and carrying a ball at its other end.
  • the ball member of the re ⁇ troaction interacts with a groove or a bore located in the center of the movable power distribution.
  • An operating clearance permits swiveling and glis ⁇ ment of the ball in the groove allowing ⁇ moves the movable member of power distribution in a direction transverse to the axis of the shaft / blade re ⁇ troaction.
  • This connection allows relative sliding of the two elements by generating little parasitic friction of the mobile power distribution member on the liner which carries it, resulting in hysteresis performance and resolution of the servovalve acceptable against the requirements of the users of these equipments.
  • the ball presses and rolls on one or other of the faces of the throat that contains it.
  • Repeated displacements of the mobile power unit by soliciting the interface between the ball and the groove which contains it, cause the wear of this link which aug ⁇ mente then the clearance between the mobile power distribution member and the ball of the feedback organ.
  • This wear increases the clearance between the ti ⁇ roir and the feedback element which disturbs the servo of the servovalve. This disturbance is at the origin of many returns for defective servovalves. Reducing this frictional wear therefore makes equipment more reliable and improves their service life.
  • An object of the invention is to decrease the wear generated by the relative movements of the re member ⁇ FEEDBACK AND of the movable dispensing then ⁇ ciency of a servo while maintaining a resolution of the characteristics and acceptable hysteresis.
  • a two-stage hydraulic servovalve comprising:
  • a power stage comprising a mobile power distribution device
  • the movable power distribution comprises means clamp ⁇ of the feedback element which are shaped to allow movement of a pinched portion of the feedback member relatively to the moving member of distribution bution of power at least in a direction trans vers ⁇ a pinch force generated by the clamping means.
  • connection made by clamping between the movable power member and the feedback member is then without play and reduces the wear of the junction between the parts.
  • the clamping means are shaped to allow at least one displacement of a pinched portion of the feedback member relative to the mobile power distribution member at least in a direction transverse to the pinch force generated by the clamping means.
  • This type of clamping allows a connection between the movable power distribution member and the feedback member which limits the creation of forces detrimental to the displacement of the movable dis ⁇ tribution power in his shirt. These displacements are preferably obtained by the use of slender metal rods.
  • FIG. 1 is a sectional view along a plane normal to the axis of movement of the movable power distribution member of a servo valve according to the invention.
  • FIG. 1 is a sectional view along a broken plane A-A shown in Figure 1.
  • FIG. 3 is a view similar to that of FIG. 1 illustrating the power stage during a movement of the mobile power distribution device of the servovalve
  • the servovalve generally designated 1 comprises a control stage 100 and a power stage 200.
  • the control stage 100 comprises a torque motor comprising a stator 2 and a rotor 3.
  • the stator 2 comprises a cage surrounding the rotor 3 which rotates along the axis Z.
  • the rotor 3 comprises two main elements:
  • the column 20 carries a fluid ejector 4 facing a fixed receiver 5.
  • the column 20 is ALIMEN ⁇ ted fluid and the fluid ejector 4 supplies hydraulic fluid jet towards the fixed receiver 5 according to an angular orientation function
  • the column 20 is coupled to an elastic return member (not shown here) to an equilibrium position in which the ejector 4 is substantially opposite the center of the receiver 5.
  • the power stage 200 includes a shirt cy ⁇ lindrique 10 sealingly secured to the frame of the ser ⁇ vovalve 1.
  • This jacket comprises an axial bore 12 machined in its center in which slides a slide 7.
  • the sleeve 10 is provided with drilled channels and lights communicating with the hydraulic power supply (P), output (U1 and U2) and return (R) ports of the servovalve.
  • the liner 10 is pierced with a second radial bore 13 made in the middle.
  • the receiver 5 is fluidly connected to the pilot chambers 9 located on either side of the ti ⁇ roir 7; so that an angular displacement of the ejector 4 facing the receiver 5 produces a differential pressure in the control chambers 9 which ⁇ ⁇ on the drawer 7 a displacement force.
  • the slide 7 is of cylindrical shape and pierced with two bores including a first axial bore 14 and a radial bore is ⁇ cond 15 made substantially at its mid ⁇ place.
  • a feedback blade 6 mechanically linked to the 7 and integral tray of the column 20 passes through the radial bore 13 of the sleeve 10 and the radial bore 15 of ti ⁇ roir 7 so that one end of the rhyroidac ⁇ blade 6 extends into the axial bore 12 of the slide 7.
  • the feedback blade 6 has a substantially triangular shape and comprises a base 23 which is re ⁇ connected to a sleeve 11 hooped on the column 20.
  • the tip of the blade 6 forms an end 22 which extends through radial bores 13 and 15 of the liner 10 and the drawer 7.
  • the end 22 of the feedback blade 6 is gripped by pinch means 8 integral with the slide 7.
  • the clamping means 8 comprise pressure screws 16 screwed into the slide 7 in internal threads. it is coaxial with the bore 12.
  • the pressure screws 16 push on pinches 17 slidably mounted in the axial bore 12 and carrying metal rods 18 extending cantilevered to clamp the end 22 of the feedback blade 6.
  • the pinch of the feedback blade 6 is achieved by the screwing of the pressure screws 16 which exert a force on the pincers 17, which transmit this ef ⁇ strong to the rods 18.
  • the ends of the rods 18 come to pinch the feedback blade 6 ensuring the connection between the latter and the drawer 7.
  • the assembly operations preferably comprise the following succession of steps:
  • an instruction in the form of an electric current is sent to the stator 2 of the torque motor.
  • This instruction causes an angular movement of the rotor 3 around the Z axis.
  • the torsion exerted by the torque motor on the column 20 via the rotor 3 modifies the relative position of the ejector 4 and the fixed receiver 5, and causes a difference.
  • - tial pressure between the chambers 9 located on either side of the drawer 7. the latter then moves a value substantially proportional to the elec tric ⁇ instruction received by the torque motor.
  • Moving the ti ⁇ roir 7 in the jacket 10 then communicates a set of drilled channels and lights whose arrangement allows to deliver a pressure or a flow rate proportional to the displacement of said ⁇ power distribution member 7.
  • the base 23 of the feedback blade 6 embedded in the column 20 is then subjected to an angular displacement in one direction and its pinched end is subjected to a displacement of the slide 7 in an opposite direction, as ⁇ glossy in Figure 4.
  • feedback blade 6 then exerts an elastic return by servo function between the drawer 7 and the rotor 3 (via the column 20 ) by generating on the rotor 3 a torque which comes to evade the control action.
  • the clamping means 8 of the re ⁇ troaction member 6 may comprise a single screw 16 pinching, for example, the feedback member against a fixed part;
  • the flexibility of the clamping means of the feedback member described here can be provided by deformable members such as springs, polymer or latex-based elements, a damping hydraulic ⁇ , or Belleville washers;
  • the feedback member 6 can be connected to ro ⁇ tor via the column 20 or by mechanical connection with the ejector or the nozzle of the control stage.
  • the invention also applies to a ser- vovalve equipped with other types of mobile bodies then ⁇ ciency such as, for example, rotary valves;
  • the invention also applies to a servo valve equipped with other types of re ⁇ troaction organs such as, for example, rods of rodiac ⁇ .
  • hydraulic transmitter is connected to the motor rotor by a column
  • the invention is of course not limited to this configuration, and applies to other types of servovalves in which the position of the hydraulic transmitter relative to the receiver re ⁇ is fixed for example by an eccentric or a connecting rod connected to the movable part of the motor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)
  • Manipulator (AREA)
  • Hydraulic Motors (AREA)

Abstract

Hydraulic servovalve (1) having two stages and feedback members, in which the moving power-distribution member (7) comprises means (8) of trapping the feedback member (6), allowing at least a movement of one trapped part of the feedback member relative to the moving distribution member.

Description

SERVOVALVE A DEUX ETAGES ET ETAGE DE PILOTAGE ADAPTE A SERVOVALVE HAS TWO FLOORS AND STEERING FLOOR ADAPTED TO
UNE TELLE SERVOVALVE SUCH SERVOVALVE
Domaine de l' invention Field of the invention
L' invention est relative à un étage de pilotage de servovalve, pouvant servir de premier étage dans une servovalve à deux étages.  The invention relates to a servovalve control stage, which can serve as a first stage in a two - stage servovalve.
Etat de la technique  State of the art
Une servovalve classique est constituée d'un étage de pilotage pilotant un organe mobile de distribu¬ tion de puissance d'un étage de puissance. L'étage de puissance a pour fonction de délivrer une pression ou un débit proportionnel à une instruction transmise à l'étage de pilotage. A conventional servovalve consists of a control stage controlling a mobile power distribution device ¬ tion of a power stage. The function of the power stage is to deliver a pressure or a flow proportional to an instruction transmitted to the control stage.
L'étage de pilotage comporte deux éléments hy¬ drauliques, à savoir un émetteur hydraulique (buse ou éjecteur) et un récepteur hydraulique (palette, déflec¬ teur ou récepteur fixe) dont la modification de leur position relative génère des différentiels de pression qui sont exploités pour déplacer finement un organe mobile de distribution de puissance de l'étage de puissance de la servovalve. Cet organe mobile de distribution de puis¬ sance coulisse dans une chemise cylindrique implantée dans le corps de la servovalve. Généralement, la position de l'émetteur ou du récepteur hydraulique est pilotée par un moteur couple qui déplace l'un des éléments hydrauli¬ ques de l'étage de pilotage en regard de l'autre. Le dé¬ placement de l'organe mobile de distribution de puissance dans sa chemise met alors en communication un ensemble de canaux forés et de lumières dont l'agencement permet de délivrer une pression ou un débit, proportionnels au dé¬ placement dudit organe mobile de distribution de puis¬ sance . The control stage comprises two hy ¬ hydraulic elements, namely a hydraulic transmitter (nozzle or ejector) and a hydraulic receiver (pallet, defl ¬ tor or fixed receiver) whose modification of their relative position generates pressure differentials which are operated to finely move a movable power distribution member of the power stage of the servovalve. This movable member of distribution then ¬ slide defect in a cylindrical sleeve implanted in the body of the servovalve. Generally, the position of the transmitter or of the hydraulic receiver is controlled by a torque motor that moves one of the elements of the hydrauli c ¬ pilot stage next to the other. The displacement of the mobile power distribution member in its liner then communicates a set of bored channels and lights whose arrangement makes it possible to deliver a pressure or a flow, proportional to the displacement of said movable member. distribution and ¬ failure.
Ces servovalves comprennent une liaison mécanique entre le rotor du moteur couple et l'organe mobile de distribution de puissance, réalisée à l'aide d'un organe de rétroaction. L'organe de rétroaction est généralement raccordé à l'organe mobile de distribution de puissance au milieu de celui-ci et est également relié à l'élément hydraulique associé au rotor via ce dernier. L'organe de rétroaction asservit la position de l'organe mobile de distribution de puissance au rotor de la servovalve et engendre sur le moteur couple un couple qui vient se soustraire à l'action de commande. These servovalves comprise a mechanical connection between the rotor of the torque motor and the mobile power distribution member, made using a device of feedback. The feedback member is generally connected to the movable power distribution member in the middle thereof and is also connected to the hydraulic element associated with the rotor via the latter. The feedback member slaves the position of the movable power distribution member to the rotor of the servovalve and generates on the torque motor a torque which is withdrawn from the control action.
Dans la majorité des cas, l'organe de rétroaction comprend une tige ou une lame flexible opérationnellement liée au rotor en une de ses extrémités et portant une bille en son autre extrémité. La bille de l'organe de ré¬ troaction interagit avec une gorge ou un alésage situé au centre de l'organe mobile de distribution de puissance. Un jeu de fonctionnement autorise le rotulage et le glis¬ sement de la bille dans la gorge permettant le déplace¬ ment de l'organe mobile de distribution de puissance dans une direction transverse à l'axe de la tige/lame de ré¬ troaction. Cette liaison permet un glissement relatif des deux éléments en engendrant peu de frottement parasites de l'organe mobile de distribution de puissance sur la chemise qui le porte, résultant en des performances en hystérésis et résolution de la servovalve acceptables en regard des exigences des utilisateurs de ces équipements. In most cases, the feedback member comprises a rod or a flexible blade operably connected to the rotor at one end and carrying a ball at its other end. The ball member of the re ¬ troaction interacts with a groove or a bore located in the center of the movable power distribution. An operating clearance permits swiveling and glis ¬ ment of the ball in the groove allowing ¬ moves the movable member of power distribution in a direction transverse to the axis of the shaft / blade re ¬ troaction. This connection allows relative sliding of the two elements by generating little parasitic friction of the mobile power distribution member on the liner which carries it, resulting in hysteresis performance and resolution of the servovalve acceptable against the requirements of the users of these equipments.
A chaque déplacement de l'organe mobile de dis¬ tribution de puissance, la bille appuie et roule sur l'une ou l'autre des faces de la gorge qui la contient. Les déplacements répétés de l'organe mobile de puissance, en sollicitant l'interface entre la bille et la gorge qui la contient, provoquent l'usure de cette liaison qui aug¬ mente alors le jeu entre l'organe mobile de distribution de puissance et la bille de l'organe de rétroaction. Cette usure entraîne une augmentation du jeu entre le ti¬ roir et l'organe de rétroaction qui vient perturber l'asservissement de la servovalve. Cette perturbation est à l'origine de nombreux retours pour défaut des servoval- ves. La réduction de cette usure par frottement permet donc de fiabiliser les équipements et d'améliorer leur durée de vie. With each movement of the movable power dis¬ tribution device, the ball presses and rolls on one or other of the faces of the throat that contains it. Repeated displacements of the mobile power unit, by soliciting the interface between the ball and the groove which contains it, cause the wear of this link which aug ¬ mente then the clearance between the mobile power distribution member and the ball of the feedback organ. This wear increases the clearance between the ti ¬ roir and the feedback element which disturbs the servo of the servovalve. This disturbance is at the origin of many returns for defective servovalves. Reducing this frictional wear therefore makes equipment more reliable and improves their service life.
Les solutions pour palier à cette faiblesse peu¬ vent consister en la sélection de matériaux plus durs ou la réalisation de traitements de surface locaux permet¬ tant de réduire l'usure provoquée par les frottements. Les servovalves étant des équipements à encombrement ré- duit mettant en jeu des pièces de faibles dimensions, ces solutions s'avèrent, dans la pratique, délicates à mettre en œuvre . The solutions to compensate for this weakness ¬ little wind consist of the selection of harder materials or performing local surface treatment allows ¬ as to reduce wear caused by friction. As servovalves are low-profile devices involving small parts, these solutions are, in practice, tricky to implement.
On connaît également des dispositifs de liaison rigide de l'organe de rétroaction à l'organe mobile de distribution de puissance par pincement de l'organe de rétroaction. Dans de tels dispositifs, des vis de pres¬ sion montées selon un axe longitudinal dans l'organe mo¬ bile de distribution de puissance viennent serrer l'organe de rétroaction, supprimant ainsi tout jeu entre ces deux éléments. L'inconvénient majeur de cette solu¬ tion réside dans les efforts radiaux générés par cette liaison et qui sont à l'origine d'importants frottements de l'organe mobile de distribution de puissance contre la chemise cylindrique dans laquelle il coulisse. De tels frottements détériorent rapidement les surfaces de cou- lissement entre l'organe mobile de distribution de puis¬ sance et la chemise, compromettant la fiabilité et la du¬ rée de vie de la servovalve. Ces frottements ont un im¬ pact fort sur la sensibilité de la servovalve et dégra- dent notamment son hystérésis, pouvant aller jusqu'au blocage complet dans les cas extrêmes. There are also known rigid connection devices of the feedback member to the mobile power distribution member by pinching the feedback member. In such devices, pres ¬ tion screws mounted along a longitudinal axis in the mo ¬ bile power distribution member come to tighten the feedback member, thus eliminating any play between these two elements. The major drawback of this solu ¬ lies in the radial forces generated by this bond, and which are the cause of high friction of the movable power distribution against the cylindrical jacket in which it slides. Such friction surfaces deteriorate rapidly between then LYING smoothening the movable distribution ¬ ciency and shirt, compromising the reliability and the life ¬ REE servo valve. This friction has a strong im ¬ pact on the sensitivity of the servo valve and degrading tooth particular hysteresis, up to complete blockage in extreme cases.
Il est connu du document US3814131 de munir l'ex¬ trémité de l'organe de rétroaction d'un embout conique qui est reçu à coulissement dans une douille à perçage conique homologue. La douille s'étend à l'intérieur de l'organe mobile de distribution de puissance en étant so¬ lidarisée à celui-ci par des ressorts (en l'occurrence des lames flexibles) autorisant une rotation de la douille autour d'un axe perpendiculaire à l'axe longitu- dinal de l'organe mobile de distribution de puissance. Ainsi lors d'un déplacement de l'organe mobile de puis¬ sance, l'embout conique se déplace dans la douille qui subit elle-même une rotation autorisée par la souplesse des lames. Cette solution ne répond que partiellement au problème d'usure de la liaison de l'organe de rétroaction avec l'organe mobile de distribution de puissance car elle génère des frottements entre la douille du plat flexible et l'embout conique de l'organe de rétroaction. Objet de l'invention It is known from US3814131 to provide the former ¬ Tremite the feedback member with a conical tip which is received slidably in a conical drilling sleeve counterpart. The socket extends inside the movable power distribution being so ¬ lidarisée thereto by springs (in this case flexible arms) allowing a rotation of the bush about an axis perpendicular to the longitu- dinal axis of the mobile power distribution member. Thus, during a displacement of the movable member ¬ sance, the conical tip moves in the sleeve which itself undergoes a rotation permitted by the flexibility of the blades. This solution only partially meets the problem of wear of the connection of the feedback member with the mobile power distribution member because it generates friction between the sleeve of the flexible plate and the conical tip of the body of the feedback. Object of the invention
Un but de l'invention est de diminuer l'usure engendrée par les mouvements relatifs de l'organe de ré¬ troaction et de l'organe mobile de distribution de puis¬ sance d'une servovalve tout en conservant des caractéris- tiques de résolution et d'hystérésis acceptables. An object of the invention is to decrease the wear generated by the relative movements of the re member ¬ FEEDBACK AND of the movable dispensing then ¬ ciency of a servo while maintaining a resolution of the characteristics and acceptable hysteresis.
Exposé de l'invention  Presentation of the invention
A cet effet, on prévoit, selon l'invention, une servovalve hydraulique à deux étages comprenant :  For this purpose, according to the invention, a two-stage hydraulic servovalve comprising:
-un étage de puissance comprenant un organe mo- bile de distribution de puissance,  a power stage comprising a mobile power distribution device,
- un étage de pilotage comprenant un moteur cou¬ ple comportant un rotor lié à un émetteur ou un déflec¬ teur de fluide hydraulique, et un organe de rétroaction déformable et opérationnellement relié au rotor et à l'organe mobile de puissance pour établir entre eux une liaison mécanique. Selon l'invention, l'organe mobile de distribution de puissance comprend des moyens de pince¬ ment de l'organe de rétroaction qui sont conformés pour autoriser un déplacement d'une partie pincée de l'organe de rétroaction relativement à l'organe mobile de distri- bution de puissance au moins suivant une direction trans¬ verse à un effort de pincement généré par les moyens de pincement . - a control stage comprising a motor neck ¬ ple having a rotor connected to a transmitter or a hydraulic fluid déflec ¬ tor, and a feedback deformable member and operatively connected to the rotor and the movable power to establish them a mechanical connection. According to the invention, the movable power distribution comprises means clamp ¬ of the feedback element which are shaped to allow movement of a pinched portion of the feedback member relatively to the moving member of distribution bution of power at least in a direction trans vers¬ a pinch force generated by the clamping means.
La liaison réalisée par pincement entre l'organe mobile de puissance et l'organe de rétroaction se fait alors sans jeu et réduit l'usure de la jonction entre les pièces .  The connection made by clamping between the movable power member and the feedback member is then without play and reduces the wear of the junction between the parts.
Selon un mode de réalisation particulièrement avantageux, les moyens de pincement sont conformés pour autoriser au moins un déplacement d'une partie pincée de l'organe de rétroaction relativement à l'organe mobile de distribution de puissance au moins suivant une direction transverse à l'effort de pincement généré par les moyens de pincement. Ce type de pincement permet une liaison en- tre l'organe mobile de distribution de puissance et l'organe de rétroaction qui limite la création d'efforts préjudiciables au déplacement de l'organe mobile de dis¬ tribution puissance dans sa chemise. Ces déplacements sont de préférence obtenus par l'utilisation de tiges mé- talliques élancées. According to a particularly advantageous embodiment, the clamping means are shaped to allow at least one displacement of a pinched portion of the feedback member relative to the mobile power distribution member at least in a direction transverse to the pinch force generated by the clamping means. This type of clamping allows a connection between the movable power distribution member and the feedback member which limits the creation of forces detrimental to the displacement of the movable dis¬ tribution power in his shirt. These displacements are preferably obtained by the use of slender metal rods.
D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit de modes de réalisation particuliers non limita¬ tifs de l'invention. Other features and advantages of the invention will become apparent from reading the following description of non-confined particular embodiments of the invention ¬ tive.
Brève description des dessins  Brief description of the drawings
Il sera fait référence aux dessins annexés, parmi lesquels :  Reference will be made to the appended drawings, among which:
- la figure 1 est une vue en coupe suivant un plan normal à l'axe de déplacement de l'organe mobile de distribution de puissance d'une servovalve selon 1 ' invention .  - Figure 1 is a sectional view along a plane normal to the axis of movement of the movable power distribution member of a servo valve according to the invention.
- la figure 2 est une vue en coupe suivant un plan brisé A-A représenté sur la figure 1.  - Figure 2 is a sectional view along a broken plane A-A shown in Figure 1.
- la figure 3 est une vue analogue à celle de la figure 1 illustrant l'étage de puissance lors d'un mouve- ment de l'organe mobile de distribution de puissance de la servovalve FIG. 3 is a view similar to that of FIG. 1 illustrating the power stage during a movement of the mobile power distribution device of the servovalve
- La figure 4 et une vue partielle en perspective de l'organe de rétroaction lors d'un mouvement de l'organe mobile de distribution de puissance de la servo¬ valve . - Figure 4 and a partial perspective view of the feedback member upon movement of the movable power distribution ¬ the servo valve.
Description détaillée d' au moins un mode de réalisation de l'invention  Detailed description of at least one embodiment of the invention
En référence aux figures 1 et 2, la servovalve généralement désignée 1 comprend un étage de pilotage 100 et un étage de puissance 200. L'étage de pilotage 100 comporte un moteur couple comprenant un stator 2 et un rotor 3. Le stator 2 comporte une cage entourant le rotor 3 qui tourne selon l'axe Z. Le rotor 3 comprend deux élé- ments principaux:  With reference to FIGS. 1 and 2, the servovalve generally designated 1 comprises a control stage 100 and a power stage 200. The control stage 100 comprises a torque motor comprising a stator 2 and a rotor 3. The stator 2 comprises a cage surrounding the rotor 3 which rotates along the axis Z. The rotor 3 comprises two main elements:
-une palette magnétique 19 sollicitée par le champ magnétique développé par le stator 2 et mobile par rapport au corps de la servovalve 1  a magnetic pad 19 biased by the magnetic field developed by the stator 2 and movable relative to the body of the servovalve 1
- une colonne 20 solidaire de la palette magnéti- que 19s' étendant selon l'axe Z en saillie du stator et pénétrant à l'intérieur du corps de la servovalve.  a column 20 secured to the magnetic pallet 19 'extending along the axis Z projecting from the stator and penetrating inside the body of the servovalve.
La colonne 20 porte un éjecteur à fluide 4 qui fait face à un receveur fixe 5. La colonne 20 est alimen¬ tée en fluide et l' éjecteur de fluide 4 envoie un jet de fluide hydraulique vers le receveur fixe 5 selon une orientation angulaire fonction du mouvement du rotor 3. La colonne 20 est attelée à un organe élastique de rappel (non représenté ici) vers une position d'équilibre dans laquelle l' éjecteur 4 est sensiblement en regard du cen- tre du receveur 5. The column 20 carries a fluid ejector 4 facing a fixed receiver 5. The column 20 is ALIMEN ¬ ted fluid and the fluid ejector 4 supplies hydraulic fluid jet towards the fixed receiver 5 according to an angular orientation function The column 20 is coupled to an elastic return member (not shown here) to an equilibrium position in which the ejector 4 is substantially opposite the center of the receiver 5.
L'étage de puissance 200 comprend une chemise cy¬ lindrique 10 fixée de manière étanche au bâti de la ser¬ vovalve 1. Cette chemise comprend un alésage axial 12 usiné en son centre dans lequel coulisse un tiroir 7. La chemise 10 est pourvue de canaux forés et de lumières communiquant avec les ports hydrauliques d'alimentation de puissance (P) , de sortie (Ul et U2) et de retour (R) de la servovalve. La chemise 10 est percée d'un second alésage 13 radial réalisé en son milieu. Deux bouchons 21 vissés sur le corps de la servovalve 1, de part et d'autre de la chemise 10, participent au maintien de celle-ci dans le corps de la servovalve 1 et assurent l'étanchéité entre l'alésage 12 et l'extérieur. The power stage 200 includes a shirt cy ¬ lindrique 10 sealingly secured to the frame of the ser ¬ vovalve 1. This jacket comprises an axial bore 12 machined in its center in which slides a slide 7. The sleeve 10 is provided with drilled channels and lights communicating with the hydraulic power supply (P), output (U1 and U2) and return (R) ports of the servovalve. The liner 10 is pierced with a second radial bore 13 made in the middle. Two plugs 21 screwed on the body of the servovalve 1, on either side of the liner 10, participate in maintaining it in the body of the servovalve 1 and ensure the seal between the bore 12 and the outside.
Le receveur 5 est fluidiquement connecté à des chambres de pilotage 9 situées de part et d'autre du ti¬ roir 7 ; de sorte qu'un déplacement angulaire de l'éjecteur 4 en regard du receveur 5 produit un différentiel de pression dans les chambres de pilotage 9 qui in¬ duit sur le tiroir 7 un effort de déplacement. The receiver 5 is fluidly connected to the pilot chambers 9 located on either side of the ti ¬ roir 7; so that an angular displacement of the ejector 4 facing the receiver 5 produces a differential pressure in the control chambers 9 which ¬ ¬ on the drawer 7 a displacement force.
Le tiroir 7 est de forme cylindrique et percé de deux alésages dont un premier alésage axial 14 et un se¬ cond alésage radial 15 réalisé sensiblement en son mi¬ lieu . The slide 7 is of cylindrical shape and pierced with two bores including a first axial bore 14 and a radial bore is ¬ cond 15 made substantially at its mid ¬ place.
Une lame de rétroaction 6 reliée mécaniquement au tiroir 7 et solidaire de la colonne 20 traverse l'alésage radial 13 de la chemise 10 et l'alésage radial 15 du ti¬ roir 7 de sorte qu'une extrémité de la lame de rétroac¬ tion 6 s'étende dans l'alésage axial 12 du tiroir 7. A feedback blade 6 mechanically linked to the 7 and integral tray of the column 20 passes through the radial bore 13 of the sleeve 10 and the radial bore 15 of ti ¬ roir 7 so that one end of the rétroac ¬ blade 6 extends into the axial bore 12 of the slide 7.
Ici, la lame de rétroaction 6 a une forme sensi- blement triangulaire et comporte une base 23 qui est re¬ liée à une douille 11 frettée sur la colonne 20. La pointe de la lame 6 forme une extrémité 22 qui s'étend au travers des alésages radiaux 13 et 15 de la chemise 10 et du tiroir 7. Here, the feedback blade 6 has a substantially triangular shape and comprises a base 23 which is re ¬ connected to a sleeve 11 hooped on the column 20. The tip of the blade 6 forms an end 22 which extends through radial bores 13 and 15 of the liner 10 and the drawer 7.
Selon l'invention, l'extrémité 22 de la lame de rétroaction 6 est pincée par des moyens de pincement 8 solidaires du tiroir 7. Ici, les moyens de pincement 8 comportent des vis de pression 16 vissées dans le tiroir 7 dans des taraudages de celui-ci coaxiaux à l'alésage 12. Les vis de pression 16 poussent sur des pinceurs 17 montés coulissants dans l'alésage axial 12 et qui portent des tiges métalliques 18 s' étendant en porte à faux pour pincer l'extrémité 22 de la lame de rétroaction 6. According to the invention, the end 22 of the feedback blade 6 is gripped by pinch means 8 integral with the slide 7. Here, the clamping means 8 comprise pressure screws 16 screwed into the slide 7 in internal threads. it is coaxial with the bore 12. The pressure screws 16 push on pinches 17 slidably mounted in the axial bore 12 and carrying metal rods 18 extending cantilevered to clamp the end 22 of the feedback blade 6.
Le pincement de la lame de rétroaction 6 est ré- alisé par le vissage des vis de pression 16 qui exercent un effort sur les pinceurs 17, qui transmettent cet ef¬ fort aux tiges 18. Les extrémités des tiges 18 viennent pincer la lame de rétroaction 6 assurant la liaison entre celle-ci et le tiroir 7. The pinch of the feedback blade 6 is achieved by the screwing of the pressure screws 16 which exert a force on the pincers 17, which transmit this ef ¬ strong to the rods 18. The ends of the rods 18 come to pinch the feedback blade 6 ensuring the connection between the latter and the drawer 7.
Les opérations de montage comprennent préféren- tiellement la succession d'étapes suivante :  The assembly operations preferably comprise the following succession of steps:
- montage du tiroir 7 dans la chemise 10 déjà bloquée dans le corps de servovalve 1 ;  - Mounting the drawer 7 in the sleeve 10 already locked in the servovalve body 1;
- montage de l'étage de pilotage 100 sur le corps 1 de la servovalve, la lame de rétroaction 6 étant intro¬ duite au travers des alésages 13 et 15 ; - Mounting the control stage 100 on the body 1 of the servo valve, the feedback plate 6 being intro ¬ through through the bores 13 and 15;
- mise en place des pinceurs 17 et des vis de pression 16 dans l'alésage 14 ;  - Placement of the nippers 17 and the set screws 16 in the bore 14;
- serrage des vis de pression 16 sur l'extrémité 22 de la lame de rétroaction 6 ;  tightening the set screws 16 on the end 22 of the feedback blade 6;
- montage et serrage des bouchons 21.  - mounting and tightening the plugs 21.
Le fonctionnement de l'ensemble est maintenant expliqué. En réponse à une demande d'un utilisateur, une instruction sous forme d'un courant électrique est en- voyée au stator 2 du moteur couple. Cette instruction entraîne un mouvement angulaire du rotor 3 autour de l'axe Z. La torsion exercée par le moteur couple sur la colonne 20 via le rotor 3 modifie la position relative de l'éjecteur 4 et du receveur fixe 5, et entraîne un diffé- rentiel de pression entre les chambres 9 situées de part et d'autre du tiroir 7. Celui-ci se déplace alors d'une valeur sensiblement proportionnelle à l'instruction élec¬ trique reçue par le moteur couple. Le déplacement du ti¬ roir 7 dans la chemise 10 met alors en communication un ensemble de canaux forés et de lumières dont l'agencement permet de délivrer une pression ou un débit proportionnels au déplacement dudit organe de distribution de puis¬ sance 7. La base 23 de lame de rétroaction 6 encastrée à la colonne 20 est alors soumise à un déplacement angu- laire dans un sens et son extrémité pincée est soumise à un déplacement du tiroir 7 dans un sens opposé, comme il¬ lustré à la figure 4. La lame de rétroaction 6 exerce alors un rappel élastique faisant fonction d'asservissement entre le tiroir 7 et le rotor 3 (via la colonne 20) en engendrant sur le rotor 3 un couple qui vient se soustraire à l'action de commande. The operation of the whole is now explained. In response to a request from a user, an instruction in the form of an electric current is sent to the stator 2 of the torque motor. This instruction causes an angular movement of the rotor 3 around the Z axis. The torsion exerted by the torque motor on the column 20 via the rotor 3 modifies the relative position of the ejector 4 and the fixed receiver 5, and causes a difference. - tial pressure between the chambers 9 located on either side of the drawer 7. the latter then moves a value substantially proportional to the elec tric ¬ instruction received by the torque motor. Moving the ti ¬ roir 7 in the jacket 10 then communicates a set of drilled channels and lights whose arrangement allows to deliver a pressure or a flow rate proportional to the displacement of said ¬ power distribution member 7. The base 23 of the feedback blade 6 embedded in the column 20 is then subjected to an angular displacement in one direction and its pinched end is subjected to a displacement of the slide 7 in an opposite direction, as ¬ glossy in Figure 4. feedback blade 6 then exerts an elastic return by servo function between the drawer 7 and the rotor 3 (via the column 20 ) by generating on the rotor 3 a torque which comes to evade the control action.
Le déplacement de l'extrémité pincée 22 de la lame de rétroaction 6 suivant l'axe de déplacement du ti¬ roir 7 (qui est parallèle à l'effort de pincement) soumet la lame de rétroaction 6 à un effort de flexion et entraîne alors un déplacement de l'extrémité pincée selon une direction normale à cet axe ainsi que, dans l'exemple illustré, un déplacement angulaire de ladite extrémité comme illustré par des flèches sur la figure 4. Ce dépla- cernent est rendu possible par la flexibilité des moyens de pincement 8 qui trouve son origine dans la souplesse des tiges métalliques 18, sans que des contraintes addi¬ tionnelles soient transmises à l'organe mobile de distri¬ bution puissance, Moving the clamped end 22 of the feedback blade 6 along the axis of displacement of the ti ¬ roir 7 (which is parallel to the pinching force) submit feedback blade 6 to a bending stress and then drives a displacement of the pinched end in a direction normal to this axis and, in the example shown, an angular displacement of said end as illustrated by arrows in FIG. 4. This displacement is made possible by the flexibility of the pinching means 8, which has its origin in the flexibility of the metal rods 18, without any constraints addi tional ¬ is transmitted to the movable member distri bution ¬ power,
Ainsi, le déplacement relatif du tiroir 7 et de la lame de rétroaction 6 s'effectue sans frottement entre ces pièces, réduisant ainsi l'usure de celles-ci.  Thus, the relative displacement of the slide 7 and the feedback blade 6 is effected without friction between these parts, thus reducing the wear thereof.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits mais englobe toute variante entrant dans le cadre de l'invention tel que définie par les revendications.  Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims.
En particulier,  In particular,
- les moyens de pincement 8 de l'organe de ré¬ troaction 6 peuvent comprendre une seule vis de pression 16 pinçant, par exemple, l'organe de rétroaction contre une partie fixe ; - the clamping means 8 of the re ¬ troaction member 6 may comprise a single screw 16 pinching, for example, the feedback member against a fixed part;
la flexibilité des moyens de pincement de l'organe de rétroaction décrite ici peut être assurée par des organes déformables comme par exemple des ressorts, des éléments en polymère ou à base de latex, un amortis¬ seur hydraulique, ou encore des rondelles Belleville ; the flexibility of the clamping means of the feedback member described here can be provided by deformable members such as springs, polymer or latex-based elements, a damping hydraulic ¬ , or Belleville washers;
- l'organe de rétroaction 6 peut être lié au ro¬ tor via la colonne 20 ou par liaison mécanique avec l'éjecteur ou la buse de l'étage de pilotage. - The feedback member 6 can be connected to ro ¬ tor via the column 20 or by mechanical connection with the ejector or the nozzle of the control stage.
- bien que la douille 11 liant l'organe de ré¬ troaction à la colonne 20 soit frettée sur celle-ci, l'invention s'applique également à d'autres modes de fixation tel que le soudage ou le clavetage ; - although the sleeve 11 re binding member ¬ troaction in column 20 is shrunk onto the latter, the invention also applies to other methods of attachment such as welding or keying;
- bien que l'organe mobile de puissance soit ici un tiroir 7, l'invention s'applique également à une ser- vovalve équipée d'autres types d'organes mobiles de puis¬ sance tels que, par exemple, des vannes rotatives; - that the movable power is here a drawer 7, the invention also applies to a ser- vovalve equipped with other types of mobile bodies then ¬ ciency such as, for example, rotary valves;
- bien que l'organe de rétroaction soit ici une lame de rétroaction 6, l'invention s'applique également à une servovalve équipée d'autres types d'organes de ré¬ troaction tels que, par exemple, des tiges de rétroac¬ tion. - that the feedback member is here a feedback blade 6, the invention also applies to a servo valve equipped with other types of re ¬ troaction organs such as, for example, rods of rétroac ¬ .
- Enfin, bien qu'ici l'émetteur hydraulique soit relié au rotor du moteur par une colonne l'invention n'est bien sûr pas limitée à cette configuration, et s'applique à d'autres types de servovalves dans lesquels la position de l'émetteur hydraulique relativement au ré¬ cepteur est fixé par exemple par un excentrique ou encore une biellette reliés à la partie mobile du moteur. - Finally, although here the hydraulic transmitter is connected to the motor rotor by a column the invention is of course not limited to this configuration, and applies to other types of servovalves in which the position of the hydraulic transmitter relative to the receiver re ¬ is fixed for example by an eccentric or a connecting rod connected to the movable part of the motor.

Claims

REVENDICATIONS
1. Servovalve hydraulique (1) à deux étages com¬ prenant : 1. Hydraulic servovalve (1) with two stages com ¬ taking:
-un étage de puissance comprenant un organe mo¬ bile de distribution de puissance (7), -an output stage comprising a member mo ¬ power distribution bile (7)
- un étage de pilotage comprenant un moteur cou¬ ple (MC) comportant un rotor (3) lié à un émetteur ou un déflecteur de fluide hydraulique (4), et un organe de ré- troaction (6) déformable et opérationnellement relié au rotor (3) et à l'organe mobile de distribution de puis¬ sance (7) pour établir entre eux une liaison mécanique, caractérisée en ce que l'organe mobile de distribution de puissance (7) comprend des moyens de pincement (8) de l'organe de rétroaction (6) qui sont conformés pour auto¬ riser un déplacement d'une partie pincée de l'organe de rétroaction (6) relativement à l'organe mobile de distri¬ bution de puissance (7) au moins suivant une direction transverse à un effort de pincement généré par les moyens de pincement (8) . - a control stage comprising a neck ¬ ple motor (MC) having a rotor (3) connected to a transmitter or a hydraulic fluid deflector (4), and a member of re- troaction (6) deformable and operatively connected to the rotor (3) and the movable dispensing then ¬ impairment (7) for establishing between them a mechanical connection, characterized in that the movable power distribution (7) comprises gripping means (8) the feedback member (6) which are shaped for self ¬ riser displacement of a pinched portion of the feedback member (6) relative to the movable member of distri bution ¬ power (7) at least in one transverse direction to a pinch force generated by the clamping means (8).
2. Servovalve selon la revendication 1, dans laquelle les moyens de pincement (8) comprennent au moins une vis de pression (17) .  2. Servo valve according to claim 1, wherein the clamping means (8) comprise at least one pressure screw (17).
3. Servovalve selon la revendication 1, dans le- quel les moyens de pincement (8) comprennent deux vis de pression (17) montées en opposition.  3. The servovalve according to claim 1, wherein the clamping means (8) comprises two oppositely mounted pressure screws (17).
4. Servovalve selon la revendication 1, dans laquelle les moyens de pincement (8) comprennent des tiges métalliques (18) s' étendant en porte-à-faux et ayant des extrémités pinçant l'organe de rétroaction (6), de sorte à autoriser le déplacement de la partie pincée de l'organe de rétroaction (6) sous l'effet d'une flexion des tiges métalliques (18).  4. A servo valve according to claim 1, wherein the clamping means (8) comprises metal rods (18) extending cantilevered and having ends pinching the feedback member (6), so as to authorizing the displacement of the pinched portion of the feedback member (6) under the effect of bending the metal rods (18).
5. Servovalve selon la revendication 1, dans la- quelle, l'organe mobile de distribution de puissance (7) étant sensiblement cylindrique, les moyens de pincement (8) sont implantés dans un alésage (14) réalisé dans cet organe mobile de puissance suivant un axe de révolution dudit organe (7) . 5. Servovalve according to claim 1, in which the movable power distribution member (7) being substantially cylindrical, the clamping means (8) are implanted in a bore (14) formed in this movable power member along an axis of revolution of said member (7).
6. Servovalve selon la revendication 1, dans la¬ quelle l'organe de rétroaction (6) est une tige. 6. Servo valve according to claim 1, in which the feedback ¬ member (6) is a rod.
7. Servovalve selon la revendication 1, dans laquelle l'organe de rétroaction (6) est une lame.  The servovalve according to claim 1, wherein the feedback member (6) is a blade.
EP12769114.5A 2011-10-12 2012-10-08 Two-stage servovalve and control stage suited to such a servovalve Active EP2766612B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1159209A FR2981414B1 (en) 2011-10-12 2011-10-12 SERVOVALVE HAS TWO FLOORS AND STEERING FLOOR SUITABLE FOR SUCH SERVOVALVE.
PCT/EP2012/069860 WO2013053668A1 (en) 2011-10-12 2012-10-08 Two-stage servovalve and control stage suited to such a servovalve

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EP2766612A1 true EP2766612A1 (en) 2014-08-20
EP2766612B1 EP2766612B1 (en) 2017-02-22
EP2766612B8 EP2766612B8 (en) 2017-05-03

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EP (1) EP2766612B8 (en)
ES (1) ES2624141T3 (en)
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GB201320192D0 (en) * 2013-11-15 2014-01-01 Blagdon Actuation Res Ltd Servo Valves
EP2889491B1 (en) * 2013-12-24 2018-06-06 Goodrich Actuation Systems SAS Servo valves
EP3284955B1 (en) * 2016-08-18 2020-02-12 Hamilton Sundstrand Corporation Servo valve spool
EP3537581B1 (en) * 2018-03-08 2022-05-04 Hamilton Sundstrand Corporation Servovalve
EP3597935B1 (en) * 2018-07-19 2021-09-08 Hamilton Sundstrand Corporation Spool assembly for servovalve
CN114396416B (en) * 2022-01-07 2022-10-25 燕山大学 Parameter sensitivity analysis method for pressure compensation system behind valve

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EP2766612B1 (en) 2017-02-22
EP2766612B8 (en) 2017-05-03
ES2624141T3 (en) 2017-07-13
WO2013053668A1 (en) 2013-04-18
US9644645B2 (en) 2017-05-09
FR2981414B1 (en) 2013-10-18
FR2981414A1 (en) 2013-04-19
US20140251447A1 (en) 2014-09-11

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