EP2766612B1 - Zweistufiges servoventil und geeignete regelstufe für ein solches servoventil - Google Patents

Zweistufiges servoventil und geeignete regelstufe für ein solches servoventil Download PDF

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Publication number
EP2766612B1
EP2766612B1 EP12769114.5A EP12769114A EP2766612B1 EP 2766612 B1 EP2766612 B1 EP 2766612B1 EP 12769114 A EP12769114 A EP 12769114A EP 2766612 B1 EP2766612 B1 EP 2766612B1
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EP
European Patent Office
Prior art keywords
servovalve
feedback
power distribution
stage
distribution member
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.)
Active
Application number
EP12769114.5A
Other languages
English (en)
French (fr)
Other versions
EP2766612A1 (de
EP2766612B8 (de
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
Zodiac Hydraulics SAS
IN LHC SAS
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Publication date
Application filed by Zodiac Hydraulics SAS, IN LHC SAS filed Critical Zodiac Hydraulics SAS
Publication of EP2766612A1 publication Critical patent/EP2766612A1/de
Publication of EP2766612B1 publication Critical patent/EP2766612B1/de
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Publication of EP2766612B8 publication Critical patent/EP2766612B8/de
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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
    • 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
    • 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
    • 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 drive 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 member 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, see for example the document US3814131 .
  • the control stage comprises two hydraulic elements, namely a hydraulic transmitter (nozzle or ejector) and a hydraulic receiver (pallet, deflector or fixed receiver) whose modification of their relative position generates pressure differentials which are exploited to move finely.
  • a movable power distribution member of the power stage of the servovalve This mobile power distribution member slides in a cylindrical jacket implanted in the body of the servovalve.
  • the position of the transmitter or the hydraulic receiver is controlled by a torque motor which moves one of the hydraulic elements of the control stage facing the other.
  • the displacement of the mobile power distribution member in its jacket then communicates a set of drilled channels and lights whose arrangement allows to deliver a pressure or a flow, proportional to the displacement of said movable power distribution member.
  • 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 of the feedback member interacts with a groove or bore in the center of the movable power distribution member. Operating clearance allows swiveling and sliding of the ball in the groove for moving the movable power distribution member in a direction transverse to the axis of the rod / feedback blade. This connection allows a relative sliding of the two elements by generating little parasitic friction of the mobile power distribution member on the sleeve which carries it, resulting in hysteresis performance and resolution of the servovalve acceptable with respect to the requirements of the users of these equipments.
  • Solutions to overcome this weakness may consist in the selection of harder materials or the realization of local surface treatments to reduce the wear caused by friction. As servovalves are devices with reduced space involving small parts, these solutions are, in practice, difficult to implement.
  • An object of the invention is to reduce the wear generated by the relative movements of the feedback member and the movable power distribution member of a servovalve while retaining acceptable resolution and hysteresis characteristics.
  • 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 nip allows a connection between the mobile power distribution member and the feedback member which limits the creation of efforts detrimental to the movement of the movable power distribution member in his liner.
  • These displacements are preferably obtained by the use of slender metal rods.
  • the column 20 carries a fluid ejector 4 which faces a fixed receiver 5.
  • the column 20 is supplied with fluid and the fluid ejector 4 sends a jet of hydraulic fluid to the stationary receiver 5 in an angular orientation depending on the movement 3.
  • 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 comprises a cylindrical jacket 10 sealingly attached to the frame of the servovalve 1.
  • This jacket comprises an axial bore 12 machined at its center in which slides a slide 7.
  • the jacket 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.
  • the receiver 5 is fluidly connected to control chambers 9 located on either side of the drawer 7; so that an angular displacement of the ejector 4 opposite the receiver 5 produces a pressure differential in the control chambers 9 which induces on the slide 7 a displacement force.
  • the spool 7 is of cylindrical shape and pierced with two bores including a first axial bore 14 and a second radial bore 15 substantially in the middle.
  • a feedback blade 6 mechanically connected to the spool 7 and integral with the column 20 passes through the radial bore 13 of the liner 10 and the radial bore 15 of the spool 7 so that one end of the feedback blade 6 extends in the axial bore 12 of the drawer 7.
  • the feedback blade 6 has a substantially triangular shape and has a base 23 which is connected to a bushing 11 shrunk on the column 20.
  • the tip of the blade 6 forms an end 22 which extends through the 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 pinching 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 force to the rods 18.
  • the ends of the rods 18 pinch the feedback blade 6 ensuring the connection between it and the drawer 7.
  • 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 differential pressure of the chambers 9 located on either side of the slide 7.
  • This then moves by a value substantially proportional to the electrical instruction received by the torque motor.
  • the displacement of the slide 7 in the liner 10 then communicates a set of drilled channels and lights whose arrangement allows to deliver a pressure or a flow 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 moving the drawer 7 in an opposite direction, as illustrated in FIG. figure 4 .
  • the feedback blade 6 then exerts an elastic return servocontrol function between the slide 7 and the rotor 3 (via the column 20) by generating on the rotor 3 a torque that comes to evade the control action.
  • the displacement of the pinched end 22 of the feedback blade 6 along the axis of movement of the slide 7 subjects the feedback blade 6 to a bending force and then causes 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 on the figure 4 .
  • This displacement is made possible by the flexibility of the clamping means 8 which originates in the flexibility of the metal rods 18, without additional constraints being transmitted to the mobile power distribution member.

Landscapes

  • 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)

Claims (7)

  1. Hydraulisches Servoventil (1) mit zwei Stufen, umfassend:
    - eine Leistungsstufe, die ein bewegliches Leistungsverteilungsorgan (7) umfasst,
    - eine Steuerstufe, die einen Drehmomentmotor umfasst, der einen Rotor (3) enthält, der mit einem Hydraulikfluidgeber oder -ablenker (4) verbunden ist, sowie ein verformbares Rückkopplungsorgan (6), das betriebsfähig mit dem Rotor (3) und dem beweglichen Leistungsverteilungsorgan (7) verbunden ist, um zwischen ihnen eine mechanische Verbindung herzustellen, dadurch gekennzeichnet, dass das bewegliche Leistungsverteilungsorgan (7) Klemmmittel (8) zum Festklemmen des Rückkopplungsorgans (6) umfasst, die so ausgebildet sind, dass sie eine Verschiebung eines festgeklemmten Teils des Rückkopplungsorgans (6) relativ zu dem beweglichen Leistungsverteilungsorgan (7) zumindest in einer Richtung quer zu einer Festklemmkraft gestatten, die von den Klemmmitteln (8) erzeugt wird.
  2. Servoventil nach Anspruch 1, bei dem die Klemmmittel (8) mindestens eine Druckschraube (17) umfassen.
  3. Servoventil nach Anspruch 1, bei dem die Klemmmittel (8) zwei gegenüberliegend angebrachte Druckschrauben (17) umfassen.
  4. Servoventil nach Anspruch 1, bei dem die Klemmmittel (8) Metallstangen (18) umfassen, die sich vorspringend erstrecken und Enden haben, die das Rückkopplungsorgan (6) derart festklemmen, dass sie die Verschiebung des festgeklemmten Teils des Rückkopplungsorgans (6) unter der Wirkung einer Biegung der Metallstangen (18) gestatten.
  5. Servoventil nach Anspruch 1, bei dem, da das bewegliche Leistungsverteilungsorgan (7) im Wesentlichen zylindrisch ist, die Klemmmittel (8) in eine Bohrung (14) eingesetzt sind, die in diesem beweglichen Leistungsorgan gemäß einer Rotationsachse des Organs (7) ausgebildet ist.
  6. Servoventil nach Anspruch 1, bei dem das Rückkopplungsorgan (6) eine Stange ist.
  7. Servoventil nach Anspruch 1, bei dem das Rückkopplungsorgan (6) eine Blatt ist.
EP12769114.5A 2011-10-12 2012-10-08 Zweistufiges servoventil und geeignete regelstufe für ein solches servoventil Active EP2766612B8 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1159209A FR2981414B1 (fr) 2011-10-12 2011-10-12 Servovalve a deux etages et etage de pilotage adapte a une telle servovalve.
PCT/EP2012/069860 WO2013053668A1 (fr) 2011-10-12 2012-10-08 Servovalve a deux etages et etage de pilotage adapte a une telle servovalve

Publications (3)

Publication Number Publication Date
EP2766612A1 EP2766612A1 (de) 2014-08-20
EP2766612B1 true EP2766612B1 (de) 2017-02-22
EP2766612B8 EP2766612B8 (de) 2017-05-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12769114.5A Active EP2766612B8 (de) 2011-10-12 2012-10-08 Zweistufiges servoventil und geeignete regelstufe für ein solches servoventil

Country Status (5)

Country Link
US (1) US9644645B2 (de)
EP (1) EP2766612B8 (de)
ES (1) ES2624141T3 (de)
FR (1) FR2981414B1 (de)
WO (1) WO2013053668A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201320192D0 (en) * 2013-11-15 2014-01-01 Blagdon Actuation Res Ltd Servo Valves
EP2889491B1 (de) * 2013-12-24 2018-06-06 Goodrich Actuation Systems SAS Servoventile
EP3284955B1 (de) * 2016-08-18 2020-02-12 Hamilton Sundstrand Corporation Servoventilschieber
EP3537581B1 (de) * 2018-03-08 2022-05-04 Hamilton Sundstrand Corporation Servoventil
EP3597935B1 (de) * 2018-07-19 2021-09-08 Hamilton Sundstrand Corporation Schiebervorrichtung für servoventil
CN114396416B (zh) * 2022-01-07 2022-10-25 燕山大学 阀后压力补偿系统参数灵敏度分析方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401603A (en) * 1967-03-03 1968-09-17 Abex Corp Fluidic-hydraulic servoactuator
US3554211A (en) * 1968-10-22 1971-01-12 G Hydraulics Inc Ab Hydraulic valve and system
US3814131A (en) * 1972-11-07 1974-06-04 Tokyo Precision Instr Co Ltd Servo valve
US4046059A (en) * 1974-07-18 1977-09-06 Willie Burt Leonard Fluidic repeater
US4335645A (en) * 1974-07-18 1982-06-22 Leonard Willie B Fluidic repeater
US4094229A (en) * 1974-11-05 1978-06-13 Leonard Willie B Fluidic repeater
US4285358A (en) * 1980-01-14 1981-08-25 Textron Inc. Servovalve feedback wire interface configuration
FR2963393B1 (fr) * 2010-07-29 2014-02-14 In Lhc Etage de pilotage de servovalve, pouvant servir de premier etage dans une servovalve a deux etages.
EP2889491B1 (de) * 2013-12-24 2018-06-06 Goodrich Actuation Systems SAS Servoventile

Also Published As

Publication number Publication date
EP2766612A1 (de) 2014-08-20
EP2766612B8 (de) 2017-05-03
ES2624141T3 (es) 2017-07-13
WO2013053668A1 (fr) 2013-04-18
US9644645B2 (en) 2017-05-09
FR2981414B1 (fr) 2013-10-18
FR2981414A1 (fr) 2013-04-19
US20140251447A1 (en) 2014-09-11

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