EP1548287A1 - Hydraulic actuator position command device and interface manifold for a servovalve operating such device - Google Patents

Hydraulic actuator position command device and interface manifold for a servovalve operating such device Download PDF

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Publication number
EP1548287A1
EP1548287A1 EP04292928A EP04292928A EP1548287A1 EP 1548287 A1 EP1548287 A1 EP 1548287A1 EP 04292928 A EP04292928 A EP 04292928A EP 04292928 A EP04292928 A EP 04292928A EP 1548287 A1 EP1548287 A1 EP 1548287A1
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EP
European Patent Office
Prior art keywords
servovalve
hydraulic
actuator
circuit
interface plate
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
EP04292928A
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German (de)
French (fr)
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EP1548287B1 (en
Inventor
Daniel Charles-Bernaud
Philippe Grelat
Franck Pollet
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Nexter Systems SA
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Giat Industries SA
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Priority to PL04292928T priority Critical patent/PL1548287T3/en
Publication of EP1548287A1 publication Critical patent/EP1548287A1/en
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    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0807—Manifolds
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/765—Control of position or angle of the output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the technical field of the invention is that of devices for controlling the position of a hydraulic actuator.
  • These devices usually include a circuit hydraulic pump incorporating a pump (for example with displacement variable) which supplies one or the other of the two the actuator via a servovalve.
  • the invention relates to a control device in position of a hydraulic actuator, device comprising a hydraulic circuit comprising a pump feeding from a tarpaulin or hydraulic reserve the two chambers of the actuator via a servovalve, each output channel of the servovalve being connected to a chamber of the actuator via a non-return valve, characterized in that at least one of the output channels of the servovalve which is connected to a actuator chamber is also connected to the tarpaulin hydraulic nozzle calibrated upstream of the valve valve.
  • T connection is intended for back to the tarpaulin 5, the input connection P to the fluid supply from the pump 3, the output connections A and B being intended to connect the servovalve 4 to the two chambers 2a and 2b of the cylinder 2.
  • the servovalve 4 is conventionally represented in FIG. 1 in its closed position (middle block 4c in the circuit) in which the four connections A, B, P and T are closed.
  • the extreme positions 4a, 4b correspond to the flow rates maximum fluid delivered by the servovalve.
  • the drawer can in a classic way occupy intermediate positions between the closed position and either of the two extreme positions. These intermediate positions correspond to different fluid flows transmitted according to one or the other of the control channels.
  • valves 9a and 9b allow the holding in position of the cylinder 2 when it is controlled in an open loop or closed loop.
  • a first nozzle 10a is connected by a pipe 11a to the pipe 8a and it drifts towards the tarpaulin 5 a part fluid flowing in it.
  • the interface plate 13 is thus also produced under the shape of a parallelepipedic block of which one face lower 13a is intended to be applied on the face 12a of the servovalve.
  • This face has four openings Ta, Aa, Ba and Pa destined to be next respectively openings T, A, B and P of the servovalve 4.
  • each opening (Ta, Aa, Ba, Pa) the interface plate 13 has a counterbore which allows fit an O-ring. This seal will be applied during mounting against the face 12a of the servovalve and will ensure sealing.
  • This variant makes it possible to accelerate in a preferential one of the movements of the cylinder.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)

Abstract

The device has a hydraulic circuit with a pump (3) for supplying, from a hydraulic tank (5), two chambers (2a, 2b) of a hydraulic actuator (2) through a servo-valve (4). Pipelines (8a, 8b) of the valve are connected to the respective chambers of the actuator through anti-return valves (9a, 9b). The pipelines are connected to the hydraulic tank by calibrated metering jets (10, 10b), in upstream of the anti-return valves.

Description

Le domaine technique de l'invention est celui des dispositifs permettant la commande en position d'un actionneur hydraulique.The technical field of the invention is that of devices for controlling the position of a hydraulic actuator.

Ces dispositifs comprennent habituellement un circuit hydraulique incorporant une pompe (par exemple à cylindrée variable) qui alimente l'une ou l'autre des deux chambres de l'actionneur par l'intermédiaire d'une servovalve.These devices usually include a circuit hydraulic pump incorporating a pump (for example with displacement variable) which supplies one or the other of the two the actuator via a servovalve.

La servovalve est un composant classique du commerce qui comprend un tiroir mobile par l'action d'un moteur couple. Ce tiroir peut occuper au moins trois positions différentes: une position centrale dans laquelle les circuits sont fermés et deux positions symétriques permettant de relier l'une ou l'autre des chambres de l'actionneur à la pompe hydraulique tandis que l'autre chambre est reliée à une bâche ou réserve hydraulique. Le tiroir peut également occuper, en fonction de la commande donnée par le moteur couple, n'importe quelle position intermédiaire entre la position centrale et l'une ou l'autre des positions extrêmes, chaque position intermédiaire correspondant à un débit de fluide différent délivré par la servovalve.The servovalve is a classic component of the trade which includes a movable drawer by the action of a torque motor. This drawer can occupy at least three different positions: one central position in which the circuits are closed and two symmetrical positions to connect one or the other of the actuator chambers to the hydraulic pump while the other room is connected to a tarpaulin or reserve hydraulic. The drawer can also occupy, depending on the command given by the torque motor, any intermediate position between the central position and one or the other extreme positions, each intermediate position corresponding to a different fluid flow delivered by the servo valve.

Une telle servovalve est utilisée d'une façon classique dans les commandes d'actionneurs en boucle fermée, c'est à dire les commandes avec asservissement de position. On peut également utiliser une telle servovalve pour une commande d'actionneur en boucle ouverte c'est à dire sans asservissement de position.Such a servovalve is used in a conventional manner in closed-loop actuator controls, it's up to say commands with position control. We can also use such a servovalve for a command of open loop actuator ie without position control.

Dans tous les cas, afin d'éviter un maintien de la pompe hydraulique en fonctionnement permanent, on dispose généralement un clapet antiretour piloté entre chaque chambre de l'actionneur et la servovalve. Ainsi la pression qui règne dans chaque chambre de l'actionneur se trouve maintenue indépendamment du niveau de l'alimentation. Ce clapet permet par ailleurs d'améliorer la précision du positionnement de l'actionneur en boucle ouverte. Cependant cette solution présente des inconvénients, aussi bien lors d'un fonctionnement en boucle fermée qu'en boucle ouverte. En effet les sections des chambres de l'actionneur sont différentes (en raison notamment de la présence de la tige du vérin dans une des chambres). Il en résulte un petit à-coup en fin de ralliement qui conduit à une imprécision au niveau du positionnement final de l'actionneur.In any case, to avoid a maintenance of the pump hydraulic system in permanent operation, we have usually a non-return valve piloted between each chamber of the actuator and the servovalve. So the pressure that reigns in every room of the actuator is kept regardless of the power level. This valve allows Moreover, to improve the precision of the positioning of the open loop actuator. However this solution disadvantages, both in a closed-loop operation only in open loop. In effect the sections of the actuator chambers are different (mainly because of the presence of the stem of the jack in one of the bedrooms). The result is a little jolt at the end of the rally, which leads to inaccuracy final positioning of the actuator.

Ainsi lorsque l'actionneur est un vérin assurant le pointage d'une arme en site, l'angle de ralliement en site obtenu est erroné par rapport à la consigne donnée et l'arme est mal pointée.Thus when the actuator is a jack ensuring the pointing of a weapon in site, the angle of rally in site obtained is erroneous with respect to the given instruction and the weapon is badly pointed.

Par ailleurs lors d'un fonctionnement en boucle ouverte on observe une dérive de positionnement de l'actionneur.Moreover during an open loop operation a positioning drift of the actuator is observed.

L'invention a pour but de pallier de tels inconvénients en proposant un dispositif de commande en position d'un actionneur hydraulique permettant une commande aussi bien en boucle fermée qu'en boucle ouverte tout en assurant la précision du positionnement et la vitesse du ralliement.The object of the invention is to overcome such drawbacks by proposing a control device in the position of a hydraulic actuator allowing control both in closed loop in open loop while ensuring the positioning accuracy and rallying speed.

L'invention permet également d'assurer ce positionnement avec des composants standards du commerce et peu coûteux.The invention also makes it possible to ensure this positioning with standard commercial components and inexpensive.

Ainsi l'invention a pour objet un dispositif de commande en position d'un actionneur hydraulique, dispositif comprenant un circuit hydraulique comprenant une pompe alimentant à partir d'une bâche ou réserve hydraulique les deux chambres de l'actionneur par l'intermédiaire d'une servovalve, chaque voie de sortie de la servovalve étant reliée à une chambre de l'actionneur par l'intermédiaire d'un clapet antiretour, caractérisé en ce qu'au moins une des voies de sortie de la servovalve qui est raccordée à une chambre de l'actionneur est également reliée à la bâche hydraulique par un gicleur calibré en amont du clapet antiretour.Thus the invention relates to a control device in position of a hydraulic actuator, device comprising a hydraulic circuit comprising a pump feeding from a tarpaulin or hydraulic reserve the two chambers of the actuator via a servovalve, each output channel of the servovalve being connected to a chamber of the actuator via a non-return valve, characterized in that at least one of the output channels of the servovalve which is connected to a actuator chamber is also connected to the tarpaulin hydraulic nozzle calibrated upstream of the valve valve.

Le dispositif pourra comprendre un gicleur calibré reliant chaque voie de sortie de la servovalve à la bâche hydraulique.The device may include a calibrated nozzle connecting each output channel of the servovalve to the cover hydraulic.

L'invention a également pour objet une plaque interface de servovalve permettant la mise en oeuvre à moindre coût de ce dispositif avec des composants standards peu coûteux.The invention also relates to an interface plate servovalve allowing the implementation at lower cost of this device with inexpensive standard components.

Cette plaque comporte au moins quatre perçages transversaux destinés à coopérer avec les quatre connexions hydrauliques de la servovalve, c'est à dire une alimentation en fluide sous pression à partir d'une pompe, une sortie vers une bâche de réserve, une première voie de commande d'une première chambre de l'actionneur et une seconde voie de commande d'une seconde chambre de l'actionneur, caractérisée en ce qu'elle comporte au moins un circuit de fuite reliant une des voies de commande à la sortie bâche, circuit dans lequel est disposé un gicleur calibré.This plate has at least four holes transversals intended to cooperate with the four connections hydraulic servovalve, ie a power supply fluid under pressure from a pump, an output to a reserve tarpaulin, a first way of ordering a first chamber of the actuator and a second way of control of a second chamber of the actuator, characterized in that it comprises at least one leakage circuit connecting one of the control channels at the exit tarpaulin, circuit in which is arranged a calibrated nozzle.

La plaque interface de servovalve pourra comporter deux circuits de fuite comprenant un gicleur calibré, chaque circuit reliant une des voies de commande à la sortie bâche.The servovalve interface plate may have two leakage circuits including a calibrated nozzle, each circuit connecting one of the control channels to the tarpaulin outlet.

Le ou les circuits de fuite seront avantageusement réalisés sous la forme de trous perpendiculaires les uns aux autres et perpendiculaires aux perçages transversaux correspondants aux différentes voies.The leak circuit (s) will be advantageously made in the form of holes perpendicular to each other other and perpendicular to the transverse bores corresponding to the different channels.

Le débouché de chaque trou à l'extérieur de la plaque pourra être obturé par un bouchon.The outlet of each hole on the outside of the plate can be closed with a plug.

Le ou les gicleurs pourront être réalisés sous la forme de vis comprenant un orifice axial calibré.The sprinkler (s) can be made in the form screw comprising a calibrated axial orifice.

D'autres caractéristiques, détails et avantages de l'invention apparaítront à la lecture de la description qui va suivre d'un mode particulier de réalisation de l'invention, description faite en référence aux dessins annexés et dans lesquels :

  • la figure 1 est un schéma hydraulique simplifié d'un dispositif de commande selon l'invention,
  • la figure 2 est un schéma simplifié de la plaque interface selon l'invention,
  • les figures 3a, 3b et 3c sont trois vues d'un mode de réalisation d'une plaque interface, les figures 3a et 3b étant des coupes suivant respectivement les plans AA et BB visibles sur la figure 3c.
Other features, details and advantages of the invention will become apparent on reading the following description of a particular embodiment of the invention, a description given with reference to the appended drawings and in which:
  • FIG. 1 is a simplified hydraulic diagram of a control device according to the invention,
  • FIG. 2 is a simplified diagram of the interface plate according to the invention,
  • FIGS. 3a, 3b and 3c are three views of an embodiment of an interface plate, FIGS. 3a and 3b being sections respectively along the planes AA and BB visible in FIG. 3c.

La figure 1 représente le schéma d'un dispositif 1 de commande en position d'un actionneur hydraulique 2, par exemple un vérin comprenant un piston 2c solidaire d'une tige 2d et délimitant deux chambres 2a et 2b. Le vérin assure le positionnement en site ou en gisement d'un tube d'arme (non représenté). Ce dispositif comprend un circuit hydraulique incorporant une pompe 3 qui alimente les deux chambres 2a, 2b de l'actionneur 2 par l'intermédiaire d'une servovalve 4. FIG. 1 represents the diagram of a device 1 of control in position of a hydraulic actuator 2, by example a cylinder comprising a piston 2c secured to a rod 2d and delimiting two chambers 2a and 2b. The cylinder ensures the positioning in site or in the field of a weapon tube (no represent). This device comprises a hydraulic circuit incorporating a pump 3 which feeds the two chambers 2a, 2b of the actuator 2 via a servovalve 4.

Cette dernière est une servovalve classique du commerce dite à "centre fermé - départ fermé".The latter is a classic commercial servovalve called "closed center - closed departure".

Elle comporte quatre connexions notées de façon conventionnelle A, B, P et T. La connexion T est destinée au retour vers la bâche 5, la connexion d'entrée P à l'alimentation en fluide à partir de la pompe 3, les connexions de sortie A et B étant destinées à relier la servovalve 4 aux deux chambres 2a et 2b du vérin 2.It has four connections noted so Conventional A, B, P and T. The T connection is intended for back to the tarpaulin 5, the input connection P to the fluid supply from the pump 3, the output connections A and B being intended to connect the servovalve 4 to the two chambers 2a and 2b of the cylinder 2.

La pompe 3 se trouve ainsi reliée par une canalisation amont 6a à la bâche hydraulique 5 (ou réserve de fluide) et elle débite par une canalisation aval 6b vers la connexion d'entrée P de la servovalve 4.The pump 3 is thus connected by a pipe upstream 6a to the hydraulic tank 5 (or reserve of fluid) and it flows through a downstream pipe 6b to the connection input P of the servovalve 4.

La servovalve 4 est représentée de façon conventionnelle sur la figure 1 dans sa position fermée (bloc médian 4c dans le circuit) dans laquelle les quatre connexions A, B, P et T sont obturées.The servovalve 4 is conventionally represented in FIG. 1 in its closed position (middle block 4c in the circuit) in which the four connections A, B, P and T are closed.

Le tiroir de la servovalve peut occuper au moins deux positions actives extrêmes différentes :

  • une première (bloc de gauche 4a dans le circuit) dans laquelle la connexion d'entrée P est reliée à la connexion de sortie A tandis que l'autre sortie B est reliée à la bâche 5 via la connexion T,
  • une seconde (bloc de droite 4b dans le circuit) dans laquelle la connexion d'entrée P est reliée à la connexion de sortie B tandis que l'autre sortie A est reliée à la bâche 5 via la connexion T.
The servovalve spool can occupy at least two different extreme active positions:
  • a first (left block 4a in the circuit) in which the input connection P is connected to the output connection A while the other output B is connected to the cover 5 via the connection T,
  • one second (right block 4b in the circuit) in which the input connection P is connected to the output connection B while the other output A is connected to the cover 5 via the connection T.

Les déplacements du tiroir de la servovalve sont commandés de façon classique par un moteur couple 4d intégré à la servovalve, moteur couple qui est piloté par une unité de commande électronique 7.The movements of the servovalve drawer are conventionally controlled by an integrated 4d torque motor to the servovalve, torque motor that is driven by a unit electronic control 7.

Les positions extrêmes 4a,4b correspondent aux débits maximaux de fluide fournis par la servovalve. Le tiroir peut d'une façon classique occuper des positions intermédiaires entre la position fermée et l'une ou l'autre des deux positions extrêmes. Ces positions intermédiaires correspondent à des débits de fluide différents transmis selon l'une ou l'autre des voies de commande. The extreme positions 4a, 4b correspond to the flow rates maximum fluid delivered by the servovalve. The drawer can in a classic way occupy intermediate positions between the closed position and either of the two extreme positions. These intermediate positions correspond to different fluid flows transmitted according to one or the other of the control channels.

Les connexions de sortie A et B de la servovalve 4 sont reliées par des canalisations 8a et 8b aux chambres 2a et 2b du vérin 2 par l'intermédiaire de deux clapets antiretour pilotés 9a, 9b.The output connections A and B of the servovalve 4 are connected by pipes 8a and 8b to chambers 2a and 2b of the cylinder 2 by means of two non-return valves driven 9a, 9b.

Ces clapets sont représentés ici sous la forme d'un seul bloc hydraulique 9 comportant quatre sorties C, D, E et F. Chaque clapet 9a,9b comprend une bille appliquée sur un siège par la pression qui règne du côté de l'actionneur 2. La bille peut être écartée du siège par une pression de commande.These valves are represented here in the form of a single hydraulic block 9 having four outputs C, D, E and F. Each valve 9a, 9b comprises a ball applied on a seat by the pressure on the side of the actuator 2. The ball can be removed from the seat by a control pressure.

Le clapet 9a est interposé entre les sorties C et E et il relie la chambre 2a de l'actionneur et la connexion A de la servovalve 4. Le clapet 9b est interposé entre les sorties D et F et il relie la chambre 2b de l'actionneur et la connexion B de la servovalve 4. Des liaisons hydrauliques 9c et 9d (représentées en pointillés) assurent la commande des clapets 9b et 9a respectivement.The valve 9a is interposed between the outputs C and E and it connects the chamber 2a of the actuator and the connection A of the servovalve 4. The valve 9b is interposed between the outputs D and F and it connects the actuator chamber 2b and the connection B of the servovalve 4. Hydraulic connections 9c and 9d (shown in dotted lines) provide control of valves 9b and 9a respectively.

Ainsi une arrivée de pression en D s'écoule naturellement vers F au travers du clapet 9b et soulève également la bille du clapet 9a autorisant ainsi un passage de fluide de E vers C. Inversement une arrivée de pression en C s'écoule vers E et autorise un passage de fluide de F vers D.Thus a pressure arrival in D flows naturally towards F through the valve 9b and also raises the ball of the valve 9a thus allowing a fluid passage of E towards C. Conversely a pressure inlet in C flows towards E and allows a fluid passage from F to D.

Les clapets 9a et 9b permettent le maintien en position du vérin 2 lorsqu'il est commandé en boucle ouverte ou en boucle fermée.The valves 9a and 9b allow the holding in position of the cylinder 2 when it is controlled in an open loop or closed loop.

Conformément à l'invention on dispose au moins un gicleur calibré reliant une des connexions de sortie A ou B de la servovalve 4 et la bâche hydraulique 5.According to the invention there is at least one nozzle calibrated connecting one of the output connections A or B of the servovalve 4 and the hydraulic cover 5.

Dans le mode de réalisation représenté à la figure 1 on prévoit deux gicleurs 10a et 10b.In the embodiment shown in FIG. provides two jets 10a and 10b.

Un premier gicleur 10a est relié par une canalisation 11a à la canalisation 8a et il dérive vers la bâche 5 une partie du fluide circulant dans celle ci.A first nozzle 10a is connected by a pipe 11a to the pipe 8a and it drifts towards the tarpaulin 5 a part fluid flowing in it.

Un deuxième gicleur 10b est relié par une canalisation 11b à la canalisation 8b et il dérive vers la bâche 5 une partie du fluide circulant dans celle ci.A second nozzle 10b is connected by a pipe 11b to the pipe 8b and it drifts towards the tarpaulin 5 a part of the fluid flowing in it.

Les gicleurs seront constitués par des ajutages de calibres bien définis. Les calibres seront choisis de façon à assurer une baisse de pression dans la canalisation 8a ou 8b qui est inactive sans pour autant diminuer le débit dans la canalisation 8b ou 8a qui commande le mouvement. On choisira par exemple des sections de fuite pour les gicleurs qui permettront d'assurer un débit de fuite compris entre 4% et 7% du débit de fluide fourni par la pompe 3.Sprinklers will consist of nozzles well defined calibres. The calibres will be chosen so as to ensure a reduction of pressure in line 8a or 8b which is inactive without reducing the flow in the channel 8b or 8a which controls the movement. We will choose for example leakage sections for sprinklers that ensure a leakage rate of between 4% and 7% of the fluid flow supplied by the pump 3.

Les gicleurs 10a et 10b ne perturbent donc pas le fonctionnement normal de la servovalve 4 car ils n'occasionnent pas de perte de débit notable dans une canalisation alimentée par la pompe 3.The jets 10a and 10b do not disturb the normal operation of the servovalve 4 because they do not cause significant loss of flow in a pipeline powered by the pump 3.

Néanmoins lorsque la servovalve 4 se trouve dans sa position fermée représentée à la figure 1, les gicleurs assurent un abaissement de la pression de fluide dans les canalisations 8a et 8b, en amont de la soupape 9.Nevertheless, when the servovalve 4 is in its closed position shown in Figure 1, the sprinklers ensure a lowering of the fluid pressure in the pipes 8a and 8b, upstream of the valve 9.

Cet abaissement de pression permet de stabiliser les clapets antiretour 9a et 9b. En effet, le maintien de la pression dans les chambres de l'actionneur est assuré par les billes qui sont appliquées sur leur siège par la pression côté vérin. Ces billes voient de l'autre côté de leur siège la pression des canalisations 8a ou 8b.This lowering of pressure makes it possible to stabilize the check valves 9a and 9b. Indeed, maintaining the pressure in the chambers of the actuator is ensured by the balls that are applied on their seat by the pressure cylinder side. These marbles see on the other side of their seat the pressure of the pipes 8a or 8b.

Grâce aux gicleurs 10a et 10b, la pression dans les canalisations 8a et 8b au niveau des entrées C et D est inférieure à celle qui se trouve respectivement aux entrées E et F. Les billes restent donc appliquées sur leurs sièges et on évite tout rebond qui conduirait à un à-coup de positionnement du vérin.With the jets 10a and 10b, the pressure in the lines 8a and 8b at the inputs C and D is less than that at the E inputs and F. The balls therefore remain applied on their seats and we avoid any rebound that would lead to a jolt of positioning of the cylinder.

Le pointage est donc obtenu avec précision lors d'un asservissement de positionnement du vérin en boucle fermée et la position est maintenue sans dérive lors d'un asservissement en boucle ouverte.The score is thus obtained precisely during a servo positioning of the cylinder in closed loop and the position is maintained without drift during a servo in open loop.

On prévoira au moins un gicleur raccordé sur la canalisation opposée au mouvement que l'on souhaite accélérer. On prévoira de préférence deux gicleurs, un raccordé sur chaque canalisation.At least one nozzle connected to the channeling opposed to the movement we want accelerate. Preferably two sprinklers, one connected on each pipe.

Concrètement il est possible de mettre en oeuvre l'invention avec un montage des canalisations 11a et 11b qui seraient raccordées directement en n'importe quel point des canalisations 8a et 8b. Concretely it is possible to implement the invention with an assembly of the pipes 11a and 11b which would be connected directly to any point of the pipes 8a and 8b.

Selon un mode de réalisation préféré de l'invention on la mettra en oeuvre en prévoyant une plaque interface particulière 13 solidaire de la servovalve 4.According to a preferred embodiment of the invention, it is will implement by providing an interface plate particular 13 secured to the servovalve 4.

La figure 2 montre un schéma hydraulique simplifié de la plaque interface 13 et les figures 3a, 3b et 3c montrent un mode de réalisation particulier de cette plaque interface.Figure 2 shows a simplified hydraulic diagram of the interface plate 13 and FIGS. 3a, 3b and 3c show a particular embodiment of this interface plate.

Une servovalve 4 est concrètement réalisée sous la forme d'un composant comportant une embase parallélépipédique 12 qui porte sur une même face supérieure 12a les ouvertures (ou connexions) d'entrées et sorties A, B, T et P.A servovalve 4 is concretely produced in the form of a component comprising a parallelepiped base 12 which bears on the same upper face 12a the openings (or connections) of inputs and outputs A, B, T and P.

La plaque interface 13 est donc elle aussi réalisée sous la forme d'un bloc parallélépipédique dont une face inférieure 13a est destinée à être appliquée sur la face 12a de la servovalve. Cette face comporte quatre ouvertures Ta, Aa, Ba et Pa destinées à se trouver en regard respectivement des ouvertures T, A, B et P de la servovalve 4. D'une façon classique et non représentée, chaque ouverture (Ta,Aa,Ba,Pa) de la plaque interface 13 comporte un lamage qui permet de loger un joint torique. Ce joint sera appliqué lors du montage contre la face 12a de la servovalve et assurera l'étanchéité.The interface plate 13 is thus also produced under the shape of a parallelepipedic block of which one face lower 13a is intended to be applied on the face 12a of the servovalve. This face has four openings Ta, Aa, Ba and Pa destined to be next respectively openings T, A, B and P of the servovalve 4. In a way classical and not shown, each opening (Ta, Aa, Ba, Pa) the interface plate 13 has a counterbore which allows fit an O-ring. This seal will be applied during mounting against the face 12a of the servovalve and will ensure sealing.

Une face supérieure 13b de la plaque 13 porte quatre ouvertures Tb, Ab, Bb et Pb sur lesquelles seront raccordées les différentes canalisations du circuit hydraulique. Les canalisations 8a et 8b qui conduisent au vérin sont fixées aux ouvertures Ab et Bb, la canalisation 6b qui vient de la pompe 3 est fixée à l'ouverture Pb et la canalisation 18 qui retourne à la bâche hydraulique 5 est fixée à l'ouverture Tb. Les fixations se font à l'aide de raccords hydrauliques appropriés.An upper face 13b of the plate 13 carries four openings Tb, Ab, Bb and Pb to which will be connected the different pipes of the hydraulic circuit. The 8a and 8b that lead to the cylinder are fixed at openings Ab and Bb, line 6b which comes from pump 3 is attached to the opening Pb and the pipe 18 which returns to the hydraulic cover 5 is attached to the opening Tb. Fasteners are made using hydraulic couplings appropriate.

On pourra également appliquer la face 13b contre un bloc hydraulique (non représenté) qui portera des trous correspondant aux ouvertures Tb, Ab, Bb et Pb. Ces dernières ouvertures porteront alors aussi des lamages (non représentés) permettant de loger des joints toriques qui assureront l'étanchéité du raccordement avec le bloc. Le bloc sera relié par des canalisations appropriées au vérin, à la pompe et à la bâche. We can also apply the face 13b against a block hydraulic (not shown) which will carry holes corresponding to the openings Tb, Ab, Bb and Pb. openings will then also bear represented) for housing O-rings which will seal the connection with the block. The block will be connected by appropriate lines to the jack, to the pump and tarpaulin.

Les différentes ouvertures de la face inférieure 13a sont reliées aux ouvertures de la face supérieure 13b par des perçages usinés dans le matériau de la plaque 13.The different openings of the lower face 13a are connected to the openings of the upper face 13b by machined holes in the material of the plate 13.

Ainsi l'ouverture Ta est reliée à l'ouverture Tb par le perçage 14, l'ouverture Aa est reliée à l'ouverture Ab par le perçage 15, l'ouverture Ba est reliée à l'ouverture Bb par le perçage 16 et l'ouverture Pa est reliée à l'ouverture Pb par le perçage 17.Thus the opening Ta is connected to the opening Tb by the 14, the opening Aa is connected to the opening Ab by the 15, the opening Ba is connected to the opening Bb by the piercing 16 and the opening Pa is connected to the opening Pb by piercing 17.

A l'intérieur de la plaque, un premier circuit de fuite hydraulique contrôlée 19a est formé par un canal sur lequel est disposé le gicleur 10a, et qui relie le perçage 15 et le perçage 14. La plaque renferme par ailleurs un deuxième circuit de fuite 19b formé par un autre canal sur lequel est disposé le gicleur 10b. Ce deuxième circuit de fuite 19b relie le perçage 16 et le perçage 14.Inside the plate, a first leak circuit controlled hydraulic system 19a is formed by a channel on which is disposed the nozzle 10a, and which connects the bore 15 and the 14. The plate also contains a second leakage circuit 19b formed by another channel on which is arranged the nozzle 10b. This second leak circuit 19b connects the piercing 16 and the piercing 14.

Ainsi la plaque 13 permet de convertir d'une façon extrêmement simple la servovalve 4 pour lui adjoindre les gicleurs proposés par l'invention. Le circuit hydraulique peut donc aisément être modifié sans qu'il soit nécessaire de prévoir des canalisations supplémentaires.So the plate 13 can convert in a way extremely simple the servovalve 4 to add the sprinklers proposed by the invention. The hydraulic circuit can therefore easily be modified without the need for provide additional piping.

Comme cela est plus particulièrement visible aux figures 3a, 3b et 3c, les circuits de fuite 19a et 19b sont réalisés sous la forme de trous orthogonaux. Une telle disposition permet de faciliter la fabrication de la plaque interface 13.As is more particularly visible in the figures 3a, 3b and 3c, the leakage circuits 19a and 19b are made in the form of orthogonal holes. Such a provision facilitates the manufacture of the interface plate 13.

Afin d'éviter toute interférence, les trous sont réalisés dans deux plans parallèles.In order to avoid any interference, the holes are made in two parallel planes.

Ainsi le plan AA (figure 3a) comprend deux trous orthogonaux 19a1 et 19a2 qui forment le premier circuit de fuite 19a. Le trou 19a2 renferme le premier gicleur 10a qui est réalisé sous la forme d'une vis dotée d'un orifice axial calibré.Thus the plan AA (figure 3a) includes two holes orthogonal 19a1 and 19a2 which form the first circuit of leakage 19a. The hole 19a2 contains the first nozzle 10a which is in the form of a screw having an axial orifice calibrated.

Le plan BB (figure 3b) comprend quatre trous 19b1, 19b2, 19b3 et 19b4 qui sont orthogonaux deux à deux et forment ainsi un rectangle. Ces quatre trous constituent le deuxième circuit de fuite 19b. Le trou 19b1 renferme le deuxième gicleur 10b qui est lui aussi réalisé sous la forme d'une vis dotée d'un orifice axial calibré. The plane BB (FIG. 3b) comprises four holes 19b1, 19b2, 19b3 and 19b4 which are orthogonal two by two and form so a rectangle. These four holes constitute the second leak circuit 19b. Hole 19b1 contains the second nozzle 10b which is also realized in the form of a screw equipped with a calibrated axial orifice.

Tous les différents trous sont obturés de façon étanche par des bouchons filetés 20.All the different holes are tightly sealed by threaded plugs 20.

On voit qu'il est aisé de modifier les caractéristiques de fuite du dispositif selon l'invention sans démontages complexes. Il suffit de dévisser les gicleurs 10a et 10b et de les remplacer par des gicleurs ayant des diamètres de fuite différents. Les diamètres de fuite des gicleurs seront choisis en fonction des caractéristiques de l'actionneur, de la charge et de la pression du circuit de l'asservissement en position.We see that it is easy to modify the characteristics leakage device according to the invention without disassembly complex. Just unscrew the nozzles 10a and 10b and to replace them with sprinklers with diameters of different leakage. The leakage diameters of the sprinklers will be chosen according to the characteristics of the actuator, the load and pressure of the servo circuit in position.

Des perçages 21 traversant la plaque interface 13 de part en part sont prévus pour permettre la fixation de la plaque sur la servovalve 4 par des vis (non représentées).Holes 21 passing through the interface plate 13 from in part are provided to allow the fixing of the plate on the servovalve 4 by screws (not shown).

A titre de variante, il est bien entendu possible de ne prévoir qu'un seul gicleur reliant une des voies d'alimentation du vérin à la bâche. Dans ce cas on remplacera l'autre gicleur par une vis non percée.As a variant, it is of course possible to provide a single nozzle connecting one of the tracks feeding the cylinder to the tarpaulin. In this case we will replace the other nozzle by a non-drilled screw.

Cette variante permet d'accélérer d'une façon préférentielle un des mouvements du vérin.This variant makes it possible to accelerate in a preferential one of the movements of the cylinder.

Claims (7)

Dispositif de commande (1) en position d'un actionneur hydraulique (2), dispositif comprenant un circuit hydraulique comprenant une pompe (3) alimentant à partir d'une bâche ou réserve hydraulique (5) les deux chambres (2a, 2b) de l'actionneur par l'intermédiaire d'une servovalve (4), chaque voie de sortie de la servovalve étant reliée à une chambre de l'actionneur par l'intermédiaire d'un clapet antiretour (9a, 9b), dispositif caractérisé en ce qu'au moins une des voies de sortie (8a, 8b) de la servovalve (4) qui est raccordée à une chambre (2a, 2b) de l'actionneur est également reliée à la bâche hydraulique (5) par un gicleur calibré (10a, 10b) en amont du clapet antiretour (9a, 9b).Control device (1) in position of a hydraulic actuator (2), device comprising a hydraulic circuit comprising a pump (3) feeding from a cover or hydraulic reserve (5) the two chambers (2a, 2b) of the actuator via a servovalve (4), each output channel of the servovalve being connected to a chamber of the actuator via a non-return valve (9a, 9b), characterized in that that at least one of the output channels (8a, 8b) of the servovalve (4) which is connected to a chamber (2a, 2b) of the actuator is also connected to the hydraulic tank (5) through a calibrated nozzle ( 10a, 10b) upstream of the non-return valve (9a, 9b). Dispositif de commande en position selon la revendication 1, dispositif caractérisé en ce qu'il comprend un gicleur calibré (10a, 10b) reliant chaque voie de sortie (8a, 8b) de la servovalve (4) à la bâche hydraulique (5).Position control device according to claim 1, characterized in that it comprises a calibrated nozzle (10a, 10b) connecting each output channel (8a, 8b) of the servovalve (4) to the hydraulic tank (5). Plaque interface (13) de servovalve mise en oeuvre dans le dispositif selon une des revendications 1 ou 2, plaque comportant au moins quatre perçages transversaux (14, 15, 16, 17) destinés à coopérer avec les quatre ouvertures ou connexions hydrauliques (A, B, P, T) de la servovalve, c'est à dire une alimentation en fluide sous pression à partir d'une pompe (3), une sortie vers une bâche de réserve (5), une première voie de commande (8a) d'une première chambre (2a) de l'actionneur et une seconde voie de commande (8b) d'une seconde chambre (2b) de l'actionneur, plaque caractérisée en ce qu'elle comporte au moins un circuit de fuite (19a,19b) reliant une des voies de commande à la sortie bâche (5), circuit dans lequel est disposé un gicleur calibré (10a, 10b).Servovalve interface plate (13) implemented in the device according to one of claims 1 or 2, a plate comprising at least four transverse bores (14, 15, 16, 17) intended to cooperate with the four openings or hydraulic connections (A, B, P, T) of the servovalve, ie a supply of fluid under pressure from a pump (3), an output to a reserve tank (5), a first control channel (8a) a first chamber (2a) of the actuator and a second control channel (8b) of a second chamber (2b) of the actuator, characterized in that it comprises at least one leakage circuit (19a , 19b) connecting one of the control channels to the tarpaulin outlet (5), circuit in which is disposed a calibrated nozzle (10a, 10b). Plaque interface de servovalve selon la revendication 3, plaque caractérisée en ce qu'elle comporte deux circuits de fuite (19a, 19b) comprenant un gicleur calibré (10a, 10b), chaque circuit reliant une des voies de commande à la sortie bâche (5).Servovalve interface plate according to Claim 3, characterized in that it comprises two leakage circuits (19a, 19b) comprising a calibrated nozzle (10a, 10b), each circuit connecting one of the control channels to the tarpaulin outlet (5). ). Plaque interface de servovalve selon une des revendications 3 ou 4, caractérisée en ce que le ou les circuits de fuite sont réalisés sous la forme de trous (19a1, 19a2, 19b1, 19b2, 19b3, 19b4) perpendiculaires les uns aux autres et perpendiculaires aux perçages transversaux (14, 15, 16) correspondants aux différentes voies.Servovalve interface plate according to one of Claims 3 or 4, characterized in that the leakage circuit or circuits are in the form of holes (19a1, 19a2, 19b1, 19b2, 19b3, 19b4) which are perpendicular to one another and perpendicular to each other. transverse bores (14, 15, 16) corresponding to the different channels. Plaque interface de servovalve selon la revendication 5, plaque caractérisée en ce que le débouché de chaque trou à l'extérieur de la plaque est obturé par un bouchon (20).Servovalve interface plate according to claim 5, characterized in that the opening of each hole outside the plate is closed by a plug (20). Plaque interface de servovalve selon une des revendications 3 à 6, plaque caractérisée en ce que le ou les gicleurs (10a, 10b) sont réalisés sous la forme de vis comprenant un orifice axial calibré.Servovalve interface plate according to one of Claims 3 to 6, characterized in that the nozzle or jets (10a, 10b) are in the form of screws comprising a calibrated axial orifice.
EP04292928A 2003-12-23 2004-12-09 Hydraulic actuator position command device and interface manifold for a servovalve operating such device Active EP1548287B1 (en)

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FR0315427A FR2864178B1 (en) 2003-12-23 2003-12-23 CONTROL DEVICE IN POSITION OF A HYDRAULIC ACTUATOR AND SERVOVALVE INTERFACE PLATE USING SUCH A DEVICE
FR0315427 2003-12-23

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US11274752B2 (en) * 2020-01-08 2022-03-15 Sun Hydraulics, Llc Flow control valve with load-sense signal generation

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FR2864178B1 (en) 2006-02-17
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US20050132876A1 (en) 2005-06-23
DE602004020440D1 (en) 2009-05-20
PL1548287T3 (en) 2009-09-30
EP1548287B1 (en) 2009-04-08
FR2864178A1 (en) 2005-06-24

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