EP1467118B1 - Device for replenishing the chambers of a hydraulic actuating cylinder - Google Patents

Device for replenishing the chambers of a hydraulic actuating cylinder Download PDF

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Publication number
EP1467118B1
EP1467118B1 EP20040290911 EP04290911A EP1467118B1 EP 1467118 B1 EP1467118 B1 EP 1467118B1 EP 20040290911 EP20040290911 EP 20040290911 EP 04290911 A EP04290911 A EP 04290911A EP 1467118 B1 EP1467118 B1 EP 1467118B1
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EP
European Patent Office
Prior art keywords
valves
spring
valve
valve seat
set forth
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EP20040290911
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German (de)
French (fr)
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EP1467118A3 (en
EP1467118A2 (en
Inventor
Alain Roy
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Goodrich Actuation Systems SAS
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Goodrich Actuation Systems SAS
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Publication of EP1467118A3 publication Critical patent/EP1467118A3/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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/047—Preventing foaming, churning or cavitation
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/265—Plural outflows
    • Y10T137/2663—Pressure responsive

Definitions

  • the invention relates to a device for regulating the pressure in the chambers of a hydraulic cylinder especially when the cylinder Hydraulic is used as shock absorber.
  • the cylinder is used by example as steering actuator of an aircraft and is apt to be used to ensure depreciation whether in mode of normal operation or in emergency mode.
  • FIG. 1 schematically illustrates a conventional device of regulating the pressure in the chambers of a hydraulic cylinder 1 used as shock absorber.
  • Said hydraulic cylinder 1 comprises a chamber 14 filled with hydraulic fluid in which a piston 13 and a piston control rod 11 integral with said piston 13.
  • the position of the piston 13 in the chamber 14 defines on either side of said piston 13 two chambers, Chamber1 and Chamber2, respectively to the left and to the right of said piston 13.
  • the hydraulic cylinder 1 receives by its control rod 11 a reciprocating motion represented by the arrow 12, said hydraulic cylinder 1 having the function of damping said reciprocating movement.
  • the fluid hydraulic moves from one chamber to another through a restrictor 3.
  • a hydraulic accumulator 4 pressurizes the hydraulic fluid above atmospheric pressure.
  • the fluid thus pressurized circulates from said physical accumulator 4 to the device 2.
  • Said device 2 a thus function to supply pressurized hydraulic fluid, when that is necessary, room Room1 or Room2 in depression.
  • said device 2 is "non-return" type, the fluid being able to circulate only from said device 2 to said chambers Chamber1, Chamber2 of said cylinder 1.
  • the device 2 for refilling the chambers of a cylinder with fluid hydraulic system typically two check valves. Said two check valves are arranged separately or placed head to tail in the same bore. And each check valve thus has its own spring and its own flap guide.
  • JP 11-63081 shows another device of the same type including features of the preamble of claim 1.
  • An object of the invention is to overcome these aforementioned drawbacks.
  • the invention proposes a device for regulating the pressure in the chambers of a hydraulic cylinder comprising a seat of hollow valve extending substantially longitudinally between two portions the valve seat body being connected to a source of pressurized fluid, each of the end portions of the valve seat being connected to a hydraulic cylinder chamber and adapted to accommodate a valve to control the supply of hydraulic fluid from said cylinder chamber, characterized in that a valve return spring is disposed in said valve seat and that each of the ends said valve return spring is attached to one of said valves.
  • the device that is the subject of the invention requires only one spring.
  • the mobile equipment consisting of spring and valves has no need to be guided. Due to the restoring force exerted by the said spring, the valves do automatically return, after their raised on the end portions of the valve seat.
  • the device object of the invention does not make use of flap guides. The size of the device object of the invention is thus limited and its implementation is simplified.
  • the device which is the subject of the invention also prevents the circulation of hydraulic fluid from said cylinder chambers to said seat of valve, said valves thus also acting as non-return valves.
  • each of the valves since its equilibrium position in contact with the corresponding end portion of the valve seat is realized when a sufficient pressure difference exists between the chamber of the hydraulic cylinder to which said portion end of said valve seat is connected and the inside of said valve seat, thereby allowing the refilling of pressurized hydraulic fluid with said cylinder chamber.
  • each of the ends of the spring of reminder valve is hooked to one of the valves substantially in the center adapted so that the mobile equipment consisting of the spring and valves need not be guided, said valves returning in particular automatically on their equilibrium position after being discarded, including understood if said valves have not spaced perfectly in the axis of the seat valve.
  • valves used in the context of the invention are spherical or conical.
  • a hole passes through each of the valves and each of the end portions of the spring forms a end wire adapted to come into said holes.
  • Said threads end protruding from holes and are welded at their outlet to said valves to allow the attachment of each of the ends of said spring to a said valves.
  • an adjustment of the spring tension is realized, once a first end portion of the spring welded to a first valve, stretching the other end portion of the spring through the through hole diametrically the second valve until the setting desired voltage. The other end portion of said spring is then welded second check valve.
  • the valves have a nipple with a hole and each of the end portions of the Valve return spring forms an end loop. Said loops ends are received in said holes of the nipples to allow hooking each end of said valve return spring to one of said valves.
  • said flaps can not be simultaneously spaced apart from said end portions of said valve seat, this which prevents the simultaneous feeding of the chambers of said cylinder.
  • the device 2 object of the invention for the fluid feed of the chambers of a jack hydraulic comprises a valve seat 5 which receives the fluid supply of the hydraulic accumulator to which it is connected via the conduit 18.
  • Said valve seat 5 is substantially cylindrical and is filled with hydraulic fluid previously pressurized by the hydraulic accumulator.
  • Said valve seat 5 has at each of its ends a seat of valve adapted to accommodate a valve 7a, 7b and for this reason will be called subsequently double-seat flapper.
  • Each of the ends of the double seat 5 of the valve is connected to one Chamber1, Chamber2 of the hydraulic cylinder used as damping, where necessary, the hydraulic fluid of one of the chambers Chamber1, Chamber2 of the cylinder hydraulic.
  • a tension spring 6 is disposed in the center of said double seat 5 of valve and the flaps 7a, 7b are attached to each of the ends of said tension spring 6.
  • valves 7a, 7b are drawn in their center at each end of said tension spring 6.
  • said two valves 7a, 7b interconnected by said traction spring 6 are, in their equilibrium position, housed in their seat respective on both sides of said double seat 5 of valve filled with fluid pressurized.
  • the restoring force exerted by the spring 6 on each of the valves 7a, 7b substantially in their center allows to maintain said valves 7a, 7b in contact with said double seat 5 of the valve and to prevent the flow of said fluid to one of the chambers.
  • the traction spring 6 advantageously constitutes a spring of valve reminder. After being removed from their equilibrium position, valves 7a, 7b automatically return, because of the force restoring force exerted by said spring 6, in an equilibrium position, to be housed in their respective seat, including if the said flaps have not spread perfectly in the axis of said double-seat valve 5. Mobile equipment consisting of the spring 6 and said valves 7a, 7b and, by construction, no need to be guided.
  • valves 7a, 7b can not be simultaneously removed from their equilibrium position in contact with the double-seat 5 of valve. Simultaneous feeding of both chambers Chamber1, Chamber2 can not operate and a faulty operation of the pressure regulating device in the cylinder chambers hydraulics is thus prevented.
  • the arrangement of the parts of the device which is the subject of the invention makes it possible to advantageously create a testable set apart from its final assembly in the device for which it is intended.
  • valves 7a, 7b are not only flaps of refueling able to allow the flow of fluid from said double-seat 5 of valve to the cylinder chambers but also flaps anti-return devices capable of preventing the circulation of fluid from said chambers of the cylinder towards said double-seat valve 5.
  • Each of the pins 14a, 14b is respectively pierced with a hole 15a, 15b adapted to receive an end portion of the spring 6 forming a loop end.
  • said spring 6 is able to extend enough for, once the first end portion forming a loop received in the hole of the nipple of a valve (for example the loop left end of the spring 6 received in the hole 15a of the stud 14a of the valve 16a), allow the assembly of the second end portion forming a loop (the right end loop in this example) with the other valve (here the valve 16b) and thus the constitution of the mobile equipment consisting of said spring 6 and said valves 16a, 16b in said seat of flap 5.
  • FIG. 4 shows more precisely a sectional view of a device according to the invention for which the attachment of the spring 6 of the valves 16a, 16b is produced in accordance with the first embodiment of illustrated in FIG. 3.
  • the references 19 and 20 represent the communication of each of the end portions of the double seat 5 of valve to one of the chambers of the hydraulic cylinder, said communication being of course allowed only when the corresponding flap is away from his equilibrium position.
  • FIG. 5 presents a second embodiment of the hanging of the tension spring 6 to the valves 17a, 17b.
  • Each of the valves 17a, 17b is a ball pierced with a hole through its diameter. Said holes extend longitudinally in extension of the longitudinal axis of said double seat 5 of valve and are adapted to receive an end portion of the spring 6 forming an end wire.
  • the subset formed of the valves 17a, 17b and the traction spring 6 is thus inchtmontable.
  • a spring tension adjustment 6 can be advantageously carried out.
  • a first weld is everything first made (the solder 8 for example) on a first portion end of the spring. Once this first welding done, the other end portion of the spring is stretched, while holding the flapper on the side of this other end portion of the spring in contact with the double seat 5 of valve (the valve 17a in the context of the example), until reaching the under tension of the desired spring.
  • the adjustment of the spring tension is schematically represented in FIG. 5 by the arrow 10.
  • the second solder (the weld 9 in this example) is then performed to render non-removable the subset formed of said valves 17a, 17b and the spring
  • the stretching of the end-wire end portion of the spring 6 through the hole in the valve to adjust the tension of the spring advantageously makes it possible to ensure adjustment of the calibration of the valve particularly accurate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
  • Safety Valves (AREA)

Description

L'invention concerne un dispositif pour la régulation de la pression dans les chambres d'un vérin hydraulique notamment lorsque le vérin hydraulique est utilisé comme amortisseur.The invention relates to a device for regulating the pressure in the chambers of a hydraulic cylinder especially when the cylinder Hydraulic is used as shock absorber.

L'invention concerne plus particulièrement un dispositif de réalimentation en fluide hydraulique des chambres d'un vérin hydraulique utilisé comme amortisseur.The invention relates more particularly to a device for hydraulic fluid supply of the chambers of a hydraulic cylinder used as shock absorber.

L'invention trouve notamment, mais non exclusivement, application dans le domaine aéronautique. Dans ce cadre, le vérin est employé par exemple comme actionneur de gouverne d'un aéronef et est apte à être utilisé pour assurer un amortissement que ce soit en mode de fonctionnement normal ou en mode de secours.The invention finds particular, but not exclusively, application in the aeronautical field. In this context, the cylinder is used by example as steering actuator of an aircraft and is apt to be used to ensure depreciation whether in mode of normal operation or in emergency mode.

La figure 1 illustre de manière schématique un dispositif classique de régulation de la pression dans les chambres d'un vérin hydraulique 1 utilisé comme amortisseur. Ledit vérin hydraulique 1 comprend une chambre 14 remplie de fluide hydraulique dans laquelle se déplacent un piston 13 et une tige de commande 11 solidaire dudit piston 13. La position du piston 13 dans la chambre 14 définit de part et d'autre dudit piston 13 deux chambres, Chambre1 et Chambre2, respectivement à gauche et à droite dudit piston 13.Figure 1 schematically illustrates a conventional device of regulating the pressure in the chambers of a hydraulic cylinder 1 used as shock absorber. Said hydraulic cylinder 1 comprises a chamber 14 filled with hydraulic fluid in which a piston 13 and a piston control rod 11 integral with said piston 13. The position of the piston 13 in the chamber 14 defines on either side of said piston 13 two chambers, Chamber1 and Chamber2, respectively to the left and to the right of said piston 13.

Le vérin hydraulique 1 reçoit par sa tige de commande 11 un mouvement alternatif représenté par la flèche 12, ledit vérin hydraulique 1 ayant pour fonction d'amortir ledit mouvement alternatif. A cet effet, le fluide hydraulique passe d'une chambre à l'autre en traversant un restricteur 3.The hydraulic cylinder 1 receives by its control rod 11 a reciprocating motion represented by the arrow 12, said hydraulic cylinder 1 having the function of damping said reciprocating movement. For this purpose, the fluid hydraulic moves from one chamber to another through a restrictor 3.

Il se produit alors une augmentation de pression dans la chambre comprimée par le mouvement de ladite tige de commande 11 et une diminution de pression dans la chambre opposée, dite alors chambre en dépression. Si ladite chambre en dépression subit une baisse de pression importante, il peut s'y produire un phénomène de cavitation qui ne permet alors pas au dispositif amortisseur à vérin hydraulique d'assurer l'amortissement attendu. There is then a pressure increase in the chamber compressed by the movement of said control rod 11 and a pressure decrease in the opposite chamber, then called chamber in depression. If said depression chamber suffers a pressure drop important, there may be a phenomenon of cavitation that does not allow then not to the damper device to hydraulic cylinder to ensure the expected amortization.

Afin d'éviter ce phénomène de cavitation, chacune des chambres Chambre1, Chambre2 est classiquement reliée à un dispositif 2 permettant de réalimenter ledit vérin 1 en fluide hydraulique.In order to avoid this cavitation phenomenon, each of the chambers Chambre1, Chambre2 is conventionally connected to a device 2 allowing refueling said cylinder 1 in hydraulic fluid.

Un accumulateur hydraulique 4 pressurise le fluide hydraulique au-dessus de la pression atmosphérique. Le fluide ainsi pressurisé circule depuis ledit accumulateur physique 4 vers le dispositif 2. Ledit dispositif 2 a ainsi pour fonction d'alimenter en fluide hydraulique pressurisé, lorsque cela est nécessaire, la chambre Chambre1 ou Chambre2 en dépression.A hydraulic accumulator 4 pressurizes the hydraulic fluid above atmospheric pressure. The fluid thus pressurized circulates from said physical accumulator 4 to the device 2. Said device 2 a thus function to supply pressurized hydraulic fluid, when that is necessary, room Room1 or Room2 in depression.

Comme cela est schématisé sur la figure 1, ledit dispositif 2 est du type "anti-retour", le fluide pouvant uniquement circuler depuis ledit dispositif 2 vers lesdites chambres Chambre1, Chambre2 dudit vérin 1.As shown schematically in FIG. 1, said device 2 is "non-return" type, the fluid being able to circulate only from said device 2 to said chambers Chamber1, Chamber2 of said cylinder 1.

Le dispositif 2 de réalimentation en fluide des chambres d'un vérin hydraulique, comme celui illustré schématiquement sur la figure 1, comprend classiquement deux clapets anti-retour. Lesdits deux clapets anti-retour sont disposés séparément ou placés tête bêche dans le même alésage. Et chaque clapet anti-retour possède ainsi son propre ressort et son propre guide clapet.The device 2 for refilling the chambers of a cylinder with fluid hydraulic system, as illustrated schematically in FIG. typically two check valves. Said two check valves are arranged separately or placed head to tail in the same bore. And each check valve thus has its own spring and its own flap guide.

De la sorte, un tel dispositif pour la réalimentation en fluide des chambres d'un vérin hydraulique est encombrant et le nombre de pièces nécessaires à sa réalisation est important. L'encombrement et la complexité de réalisation d'un tel dispositif sont en particulier tels que notamment le volume, la masse et le coût de réalisation d'un tel dispositif sont élevés. Le document JP 11-63081 montre un autre dispositif du même type comprenant les caractéristiques du préambule de la revendication 1.In this way, such a device for the fluid supply of chambers of a hydraulic cylinder is bulky and the number of parts necessary for its realization is important. Clutter and complexity of such a device are in particular such as, in particular, the volume, mass and cost of realization of such a device are high. JP 11-63081 shows another device of the same type including features of the preamble of claim 1.

Un but de l'invention est de pallier à ces inconvénients précités.An object of the invention is to overcome these aforementioned drawbacks.

A cet effet, l'invention propose un dispositif de régulation de la pression dans les chambres d'un vérin hydraulique comportant un siège de clapet creux s'étendant sensiblement longitudinalement entre deux portions d'extrémité, le corps du siège de clapet étant connecté à une source de fluide pressurisé , chacune des portions d'extrémités du siège de clapet étant reliée à une chambre du vérin hydraulique et adaptée pour accueillir un clapet permettant de contrôler la réalimentation en fluide hydraulique de ladite chambre du vérin, caractérisé en ce qu'un ressort de rappel de clapet est disposé dans ledit siège de clapet et en ce que chacune des extrémités dudit ressort de rappel de clapet est accrochée à un desdits clapets.For this purpose, the invention proposes a device for regulating the pressure in the chambers of a hydraulic cylinder comprising a seat of hollow valve extending substantially longitudinally between two portions the valve seat body being connected to a source of pressurized fluid, each of the end portions of the valve seat being connected to a hydraulic cylinder chamber and adapted to accommodate a valve to control the supply of hydraulic fluid from said cylinder chamber, characterized in that a valve return spring is disposed in said valve seat and that each of the ends said valve return spring is attached to one of said valves.

De telle sorte, le dispositif objet de l'invention ne nécessite qu'un seul ressort. De plus, l'équipement mobile constitué du ressort et des clapets n'a pas besoin d'être guidé. Du fait de la force de rappel exercée par ledit ressort, les clapets reviennent effectivement automatiquement, après leur levée, sur les portions d'extrémités du siège de clapet. Le dispositif objet de l'invention ne fait donc pas usage de guides clapets. L'encombrement du dispositif objet de l'invention est ainsi limité et sa réalisation est simplifiée.In this way, the device that is the subject of the invention requires only one spring. In addition, the mobile equipment consisting of spring and valves has no need to be guided. Due to the restoring force exerted by the said spring, the valves do automatically return, after their raised on the end portions of the valve seat. The device object of the invention does not make use of flap guides. The size of the device object of the invention is thus limited and its implementation is simplified.

Le dispositif objet de l'invention empêche en outre la circulation de fluide hydraulique depuis lesdites chambres du vérin vers ledit siège de clapet, lesdits clapets faisant ainsi également office de clapets anti-retour.The device which is the subject of the invention also prevents the circulation of hydraulic fluid from said cylinder chambers to said seat of valve, said valves thus also acting as non-return valves.

De manière préférentielle, l'écartement de chacun des clapets depuis sa position d'équilibre au contact de la portion d'extrémité correspondante du siège de clapet est réalisé dès lors qu'une différence de pression suffisante existe entre la chambre du vérin hydraulique à laquelle ladite portion d'extrémité dudit siège de clapet est reliée et l'intérieur dudit siège de clapet, autorisant de la sorte la réalimentation en fluide hydraulique pressurisé de ladite chambre du vérin.Preferably, the spacing of each of the valves since its equilibrium position in contact with the corresponding end portion of the valve seat is realized when a sufficient pressure difference exists between the chamber of the hydraulic cylinder to which said portion end of said valve seat is connected and the inside of said valve seat, thereby allowing the refilling of pressurized hydraulic fluid with said cylinder chamber.

De manière préférentielle, chacune des extrémités du ressort de rappel de clapet est accrochée à un des clapets sensiblement en son centre de manière adaptée pour que l'équipement mobile constitué du ressort et des clapets n'ait pas besoin d'être guidé, lesdits clapets revenant notamment automatiquement sur leur position d'équilibre après en avoir été écarté, y compris si lesdits clapets n'ont pas écartés parfaitement dans l'axe du siège de clapet.Preferably, each of the ends of the spring of reminder valve is hooked to one of the valves substantially in the center adapted so that the mobile equipment consisting of the spring and valves need not be guided, said valves returning in particular automatically on their equilibrium position after being discarded, including understood if said valves have not spaced perfectly in the axis of the seat valve.

De manière non limitative, les clapets utilisés dans le cadre de l'invention sont de portée sphérique ou conique.Without limitation, the valves used in the context of the invention are spherical or conical.

Selon un premier mode de réalisation de l'invention, un trou traverse chacun des clapets et chacune des portions d'extrémité du ressort forme un fil d'extrémité apte à venir s'introduire dans lesdits trous. Lesdits fils d'extrémité dépassent des trous et sont soudés à leur sortie auxdits clapets pour permettre l'accrochage de chacune des extrémités dudit ressort à un desdits clapets.According to a first embodiment of the invention, a hole passes through each of the valves and each of the end portions of the spring forms a end wire adapted to come into said holes. Said threads end protruding from holes and are welded at their outlet to said valves to allow the attachment of each of the ends of said spring to a said valves.

De manière avantageuse, un réglage de la tension du ressort est réalisé, une fois une première portion d'extrémité du ressort soudée à un premier clapet, en étirant l'autre portion d'extrémité du ressort à travers le trou traversant diamétralement le second clapet jusqu'à obtenir la mise sous tension désirée. L'autre portion d'extrémité dudit ressort est ensuite soudée audit second clapet.Advantageously, an adjustment of the spring tension is realized, once a first end portion of the spring welded to a first valve, stretching the other end portion of the spring through the through hole diametrically the second valve until the setting desired voltage. The other end portion of said spring is then welded second check valve.

Selon un second mode de réalisation de l'invention, les clapets comportent un téton percé d'un trou et chacune des portions d'extrémité du ressort de rappel de clapet forme une boucle d'extrémité. Lesdites boucles d'extrémité sont reçues dans lesdits trous des tétons pour permettre l'accrochage de chacune des extrémités dudit ressort de rappel de clapet à un desdits clapets.According to a second embodiment of the invention, the valves have a nipple with a hole and each of the end portions of the Valve return spring forms an end loop. Said loops ends are received in said holes of the nipples to allow hooking each end of said valve return spring to one of said valves.

De manière préférentielle, lesdits clapets ne peuvent être simultanément écartés desdites portions d'extrémité dudit siège de clapet, ce qui empêche l'alimentation simultanée des chambres dudit vérin.Preferably, said flaps can not be simultaneously spaced apart from said end portions of said valve seat, this which prevents the simultaneous feeding of the chambers of said cylinder.

D'autres caractéristiques, buts et avantages de l'invention apparaítront à la lecture de la description détaillée qui va suivre, et au regard des dessins annexés, donnés à titre d'exemples non limitatifs et sur lesquels :

  • la figure 1, déjà commentée, représente schématiquement un dispositif de régulation de la pression dans les chambres d'un vérin hydraulique utilisé comme amortisseur ;
  • la figure 2 représente schématiquement le dispositif pour la réalimentation en fluide des chambres d'un vérin hydraulique objet de l'invention ;
  • la figure 3 illustre un premier mode de réalisation de l'accrochage du ressort de traction aux clapets à portée sphérique ;
  • La figure 4 représente une vue en coupe d'un dispositif conforme à l'invention, l'accrochage du ressort de traction aux clapets étant réalisé conformément au premier mode de réalisation illustré sur la figure 3 ;
  • la figure 5 illustre un second mode de réalisation de l'accrochage du ressort de traction aux clapets à portée sphérique.
Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given as non-limiting examples and in which:
  • Figure 1, already commented, schematically shows a device for regulating the pressure in the chambers of a hydraulic cylinder used as a damper;
  • FIG. 2 diagrammatically represents the device for the fluid refilling of the chambers of a hydraulic jack which is the subject of the invention;
  • FIG. 3 illustrates a first embodiment of the attachment of the tension spring to the spherical bearing valves;
  • FIG. 4 represents a sectional view of a device according to the invention, the attachment of the tension spring to the valves being made according to the first embodiment illustrated in FIG. 3;
  • FIG. 5 illustrates a second embodiment of the attachment of the tension spring to the spherical bearing valves.

Comme cela est représenté sur la figure 2, le dispositif 2 objet de l'invention pour la réalimentation en fluide des chambres d'un vérin hydraulique comporte un siège 5 de clapet qui reçoit l'alimentation en fluide de l'accumulateur hydraulique auquel il est relié via le conduit 18.As shown in FIG. 2, the device 2 object of the invention for the fluid feed of the chambers of a jack hydraulic comprises a valve seat 5 which receives the fluid supply of the hydraulic accumulator to which it is connected via the conduit 18.

Ledit siège 5 de clapet est sensiblement cylindrique et est rempli de fluide hydraulique préalablement pressurisé par l'accumulateur hydraulique. Ledit siège 5 de clapet dispose à chacune de ses extrémités d'un siège de clapet apte à accueillir un clapet 7a, 7b et sera pour cette raison dénommé par la suite double-siège de clapet.Said valve seat 5 is substantially cylindrical and is filled with hydraulic fluid previously pressurized by the hydraulic accumulator. Said valve seat 5 has at each of its ends a seat of valve adapted to accommodate a valve 7a, 7b and for this reason will be called subsequently double-seat flapper.

Les clapets 7a, 7b ont préférentiellement une portée sphérique ou conique de manière à venir efficacement au contact de chacune des portions d'extrémité du double-siège 5 de clapet pour assurer l'étanchéité du dispositif objet de l'invention.The valves 7a, 7b preferentially have a spherical bearing or tapered so as to come into contact with each of the portions end of the double seat valve 5 to ensure the sealing of the device object of the invention.

Chacune des extrémités du double-siège 5 de clapet est reliée à l'une des chambres Chambre1, Chambre2 du vérin hydraulique utilisé comme amortisseur permettant, lorsque cela est nécessaire, la réalimentation en fluide hydraulique de l'une des chambres Chambre1, Chambre2 du vérin hydraulique.Each of the ends of the double seat 5 of the valve is connected to one Chamber1, Chamber2 of the hydraulic cylinder used as damping, where necessary, the hydraulic fluid of one of the chambers Chamber1, Chamber2 of the cylinder hydraulic.

Un ressort de traction 6 est disposé au centre dudit double-siège 5 de clapet et les clapets 7a, 7b sont accrochés respectivement à chacune des extrémités dudit ressort de traction 6.A tension spring 6 is disposed in the center of said double seat 5 of valve and the flaps 7a, 7b are attached to each of the ends of said tension spring 6.

De manière avantageuse, les clapets 7a, 7b sont tirés en leur centre par chacune des extrémités dudit ressort de traction 6.Advantageously, the valves 7a, 7b are drawn in their center at each end of said tension spring 6.

De telle sorte, lesdits deux clapets 7a, 7b reliés entre eux par ledit ressort de traction 6 sont, dans leur position d'équilibre, logés dans leur siège respectif de part et d'autre dudit double-siège 5 de clapet rempli de fluide pressurisé. La force de rappel exercée par le ressort 6 sur chacun des clapets 7a, 7b sensiblement en leur centre permet de maintenir lesdits clapets 7a, 7b au contact dudit double-siège 5 de clapet et de prévenir l'écoulement dudit fluide vers l'une des chambres.In this way, said two valves 7a, 7b interconnected by said traction spring 6 are, in their equilibrium position, housed in their seat respective on both sides of said double seat 5 of valve filled with fluid pressurized. The restoring force exerted by the spring 6 on each of the valves 7a, 7b substantially in their center allows to maintain said valves 7a, 7b in contact with said double seat 5 of the valve and to prevent the flow of said fluid to one of the chambers.

Le ressort de traction 6 constitue avantageusement un ressort de rappel de clapet. Après avoir été écartés de leur position d'équilibre, lesdits clapets 7a, 7b reviennent effectivement automatiquement, du fait de la force de rappel exercée par ledit ressort 6, en position d'équilibre, se loger dans leur siège respectif, y compris si lesdits clapets n'ont pas écartés parfaitement dans l'axe dudit double-siège 5 de clapet. L'équipement mobile constitué du ressort 6 et desdits clapets 7a, 7b n'a ainsi, par construction, pas besoin d'être guidé.The traction spring 6 advantageously constitutes a spring of valve reminder. After being removed from their equilibrium position, valves 7a, 7b automatically return, because of the force restoring force exerted by said spring 6, in an equilibrium position, to be housed in their respective seat, including if the said flaps have not spread perfectly in the axis of said double-seat valve 5. Mobile equipment consisting of the spring 6 and said valves 7a, 7b and, by construction, no need to be guided.

Dès lors la différence de pression entre l'une des chambres Chambre1 ou Chambre2 du vérin hydraulique alors en dépression et l'intérieur du double-siège 5 de clapet est suffisamment importante, le clapet relié à ladite chambre en dépression s'écarte de sa position d'équilibre. Le ressort 6 est alors étiré du côté correspondant audit clapet écarté de sa position d'équilibre, exerçant sur celui-ci une force de rappel, et le fluide pressurisé contenu dans le double-siège 5 de clapet s'écoule alors vers ladite chambre en dépression. Une fois la différence de pression régularisée, ledit clapet revient, du fait de la force de rappel exercée sur ledit ressort 6, sur sa position d'équilibre au contact du double-siège 5 de clapet bloquant ainsi l'écoulement du fluide hydraulique.From then on the pressure difference between one of the rooms Chambre1 or Chamber2 of the hydraulic cylinder then in depression and the interior of the double seat valve 5 is sufficiently large, the valve connected to said chamber in depression deviates from its equilibrium position. Spring 6 is then stretched on the side corresponding to said valve removed from its position of balance, exerting on it a restoring force, and the pressurized fluid contained in the double-seat valve 5 then flows to said chamber in depression. Once the pressure difference is regularized, said valve returns, because of the restoring force exerted on said spring 6, on its equilibrium position in contact with the double seat 5 blocking valve and the flow of the hydraulic fluid.

De manière avantageuse, lesdits clapets 7a, 7b ne peuvent être simultanément écartés de leur position d'équilibre au contact du double-siège 5 de clapet. L'alimentation simultanée des deux chambres Chambre1, Chambre2 ne peut donc s'opérer et un fonctionnement défectueux du dispositif de régulation de la pression dans les chambres du vérin hydraulique est ainsi prévenu. Advantageously, said valves 7a, 7b can not be simultaneously removed from their equilibrium position in contact with the double-seat 5 of valve. Simultaneous feeding of both chambers Chamber1, Chamber2 can not operate and a faulty operation of the pressure regulating device in the cylinder chambers hydraulics is thus prevented.

En outre, l'agencement des pièces du dispositif objet de l'invention permet de créer avantageusement un ensemble testable en dehors de son montage définitif dans l'appareil auquel il est destiné.In addition, the arrangement of the parts of the device which is the subject of the invention makes it possible to advantageously create a testable set apart from its final assembly in the device for which it is intended.

Bien entendu, les clapets 7a, 7b sont non seulement des clapets de réalimentation aptes à permettre la circulation de fluide depuis ledit double-siège 5 de clapet vers les chambres du vérin mais également des clapets anti-retour aptes à empêcher la circulation de fluide depuis lesdites chambres du vérin vers ledit double-siège 5 de clapet.Of course, the valves 7a, 7b are not only flaps of refueling able to allow the flow of fluid from said double-seat 5 of valve to the cylinder chambers but also flaps anti-return devices capable of preventing the circulation of fluid from said chambers of the cylinder towards said double-seat valve 5.

La description qui suit présente de manière non limitative deux modes de réalisation particuliers de l'invention, et plus précisément deux modes de réalisation de l'accrochage du ressort de traction aux clapets à portée sphérique.The following description presents in a nonlimiting manner two modes particular embodiments of the invention, and more specifically two modes of performing the attachment of the tension spring to the valves in range spherical.

La figure 3 présente un premier mode de réalisation de l'accrochage du ressort de traction 6 aux clapets 16a, 16b. Chacun desdits clapets 16a, 16b comporte respectivement un téton 14a, 14b qui s'étend vers l'intérieur du double-siège 5 de clapet.FIG. 3 presents a first embodiment of the hanging from the tension spring 6 to the valves 16a, 16b. Each of said valves 16a, 16b respectively comprises a nipple 14a, 14b which extends towards the inside of the double-seat 5 of flap.

Chacun des tétons 14a, 14b est percé respectivement d'un trou 15a, 15b apte à recevoir une portion d'extrémité du ressort 6 formant une boucle d'extrémité. De manière avantageuse, ledit ressort 6 est apte à s'étendre suffisamment pour, une fois la première portion d'extrémité formant une boucle reçue dans le trou du téton d'un clapet (par exemple la boucle d'extrémité gauche du ressort 6 reçue dans le trou 15a du téton 14a du clapet 16a), permettre l'assemblage de la deuxième portion d'extrémité formant une boucle (la boucle d'extrémité droite dans cet exemple) avec l'autre clapet (ici le clapet 16b) et donc la constitution de l'équipement mobile constitué dudit ressort 6 et desdits clapets 16a, 16b dans ledit siège de clapet 5.Each of the pins 14a, 14b is respectively pierced with a hole 15a, 15b adapted to receive an end portion of the spring 6 forming a loop end. Advantageously, said spring 6 is able to extend enough for, once the first end portion forming a loop received in the hole of the nipple of a valve (for example the loop left end of the spring 6 received in the hole 15a of the stud 14a of the valve 16a), allow the assembly of the second end portion forming a loop (the right end loop in this example) with the other valve (here the valve 16b) and thus the constitution of the mobile equipment consisting of said spring 6 and said valves 16a, 16b in said seat of flap 5.

La figure 4 représente de manière plus précise une vue en coupe d'un dispositif conforme à l'invention pour lequel l'accrochage du ressort 6 de traction aux clapets 16a, 16b est réalisé conformément au premier mode de réalisation illustré sur la figure 3. Les références 19 et 20 représentent la communication de chacune des portions d'extrémité du double-siège 5 de clapet à une des chambres du vérin hydraulique, ladite communication n'étant bien entendu autorisée que lorsque le clapet correspondant est écarté de sa position d'équilibre.FIG. 4 shows more precisely a sectional view of a device according to the invention for which the attachment of the spring 6 of the valves 16a, 16b is produced in accordance with the first embodiment of illustrated in FIG. 3. The references 19 and 20 represent the communication of each of the end portions of the double seat 5 of valve to one of the chambers of the hydraulic cylinder, said communication being of course allowed only when the corresponding flap is away from his equilibrium position.

La figure 5 présente un second mode de réalisation de l'accrochage du ressort de traction 6 aux clapets 17a, 17b. Chacun des clapets 17a, 17b est une bille percée d'un trou à travers son diamètre. Lesdits trous s'étendent longitudinalement en prolongement de l'axe longitudinal dudit double-siège 5 de clapet et sont aptes à recevoir une portion d'extrémité du ressort 6 formant un fil d'extrémité.FIG. 5 presents a second embodiment of the hanging of the tension spring 6 to the valves 17a, 17b. Each of the valves 17a, 17b is a ball pierced with a hole through its diameter. Said holes extend longitudinally in extension of the longitudinal axis of said double seat 5 of valve and are adapted to receive an end portion of the spring 6 forming an end wire.

De manière préférentielle, lesdites portions d'extrémité du ressort 6 formant un fil d'extrémité dépassent des billes formant clapets 17a, 17b et sont soudées à leur sortie desdites billes formant clapets 17a, 17b aux points référencés 8 et 9 sur la figure 5. Le sous-ensemble formé des clapets 17a, 17b et du ressort de traction 6 est ainsi indémontable.Preferably, said end portions of the spring 6 forming an end wire protrude from the valve balls 17a, 17b and are welded at their output of said valve balls 17a, 17b at the points referenced 8 and 9 in Figure 5. The subset formed of the valves 17a, 17b and the traction spring 6 is thus indémontable.

Lors de l'opération de soudure des portions d'extrémité du ressort aux billes formant clapet, un réglage de la tension du ressort 6 peut être avantageusement effectué. A cet effet, une première soudure est tout d'abord réalisée (la soudure 8 par exemple) sur une première portion d'extrémité du ressort. Une fois cette première soudure réalisée, l'autre portion d'extrémité du ressort est étirée, tout en maintenant le clapet du côté de cette autre portion d'extrémité du ressort au contact du double-siège 5 de clapet (le clapet 17a dans le cadre de l'exemple), jusqu'à atteindre la mise sous tension du ressort désirée. Le réglage de la tension du ressort est schématiquement représenté sur la figure 5 par la flèche 10. La deuxième soudure (la soudure 9 dans cet exemple) est ensuite effectuée pour rendre indémontable le sous-ensemble formé desdits clapets 17a, 17b et du ressort de traction 6. L'étirement de la portion d'extrémité formant fil d'extrémité du ressort 6 à travers le trou dans le clapet en vue du réglage de la tension du ressort permet avantageusement d'assurer un réglage du tarage de clapet particulièrement précis.During the welding operation of the end portions of the spring to ball forming valve, a spring tension adjustment 6 can be advantageously carried out. For this purpose, a first weld is everything first made (the solder 8 for example) on a first portion end of the spring. Once this first welding done, the other end portion of the spring is stretched, while holding the flapper on the side of this other end portion of the spring in contact with the double seat 5 of valve (the valve 17a in the context of the example), until reaching the under tension of the desired spring. The adjustment of the spring tension is schematically represented in FIG. 5 by the arrow 10. The second solder (the weld 9 in this example) is then performed to render non-removable the subset formed of said valves 17a, 17b and the spring The stretching of the end-wire end portion of the spring 6 through the hole in the valve to adjust the tension of the spring advantageously makes it possible to ensure adjustment of the calibration of the valve particularly accurate.

Claims (9)

  1. Device for adjusting the pressure in the chambers of a hydraulic jack comprising a hollow valve seat (5) extending substantially longitudinally between two end sections, the body of the valve seat (5) being connected to a source of pressurised fluid (18), each of the end portions of the valve seat (5) being connected to a chamber of the said hydraulic jack and adapted to receive a valve (7a, 7b) used to control refilling of the jack chamber with hydraulic fluid, characterised in that a valve return spring (6) is placed inside the said valve seat (5) and in that each of the ends of the said valve return spring (6) is attached to one of said valves (7a, 7b).
  2. Device set forth in claim 1, characterised in that it also prevents the circulation of hydraulic fluid from said chambers of the jack towards the said valve seat (5), the said valves (7a, 7b) thus also acting as non-return valves.
  3. Device set forth in either of the previous claims, characterised in that one of the valves (7a, 7b) is moved away from its equilibrium position in contact with the corresponding end portion of the said valve seat (5) if there is a sufficient difference in pressure between the chamber of the hydraulic jack to which the said end portion of said valve seat (5) is connected and the inside of the said valve seat (5), in this way making it possible to refill the said jack chamber with pressurised fluid.
  4. Device set forth in any of the previous claims, characterised in that each of the ends of the valve return spring (6) is attached to one of the valves (7a, 7b) substantially at its centre in a suitable manner so that the movable equipment composed of the said spring (6) and the said valves (7a, 7b) does not need to be guided.
  5. Device set forth in any of the previous claims, characterised in that the valves (7a, 7b) have a spherical or conical contact surface.
  6. Device set forth in any of the previous claims, characterised in that there is a hole passing through each of the valves (17a, 17b) and each of the end portions of the said spring (6) form an end wire that can be inserted through the said holes, and the said end portions forming a wire extend beyond the said holes and are welded to the said valves (17a, 17b) at the exit from the said holes so that each of the ends of the said spring (6) can be attached to one of said valves (17a, 17b).
  7. Device set forth in claim 6, characterised in that the tension of the spring (6) is adjusted, after a first end portion of the said spring (6) forming an end wire has been welded to a first valve, by pulling on the other end portion of the said spring (6) through the hole passing diametrically through the second valve until the required tension is obtained, the said other end portion of the said spring (6) then being welded to the said second valve.
  8. Device set forth in any of claims 1 to 5, characterised in that the valves (16a, 16b) comprise a centring pin (14a, 14b) in which a hole (15a, 15b) is drilled and each of said end portions of the said spring (6) form an end loop, the said end loops fit into the holes (15a, 15b) in the said centring pins (14a, 14b) so that each of the ends of said spring (6) can be attached to one of said valves (16a, 16b).
  9. Device set forth in any of the previous claims, characterised in that said valves (7a, 7b) cannot be simultaneously moved away from the said end sections of the said valve seat (5), thus preventing simultaneous filling of the said jack chambers.
EP20040290911 2003-04-09 2004-04-06 Device for replenishing the chambers of a hydraulic actuating cylinder Expired - Lifetime EP1467118B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0304385A FR2853708B1 (en) 2003-04-09 2003-04-09 DEVICE FOR REALIMENTING THE CHAMBERS OF A HYDRAULIC CYLINDER
FR0304385 2003-04-09

Publications (3)

Publication Number Publication Date
EP1467118A2 EP1467118A2 (en) 2004-10-13
EP1467118A3 EP1467118A3 (en) 2004-11-03
EP1467118B1 true EP1467118B1 (en) 2005-11-16

Family

ID=32865400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040290911 Expired - Lifetime EP1467118B1 (en) 2003-04-09 2004-04-06 Device for replenishing the chambers of a hydraulic actuating cylinder

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US (1) US7007588B2 (en)
EP (1) EP1467118B1 (en)
DE (1) DE602004000184T2 (en)
ES (1) ES2248786T3 (en)
FR (1) FR2853708B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE529042C2 (en) 2004-12-06 2007-04-17 Oehlins Racing Ab Telescopic fork
DE202005012885U1 (en) * 2005-08-16 2005-11-10 Trw Automotive Gmbh Hydraulic actuator for motor vehicle chassis stabilization system, has pressure chamber connected to anti-cavitation pressure accumulator to prevent cavitation in pressure chamber

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8327983D0 (en) * 1983-10-19 1983-11-23 Pipe Supports Ltd Shock arrestors
US6390254B1 (en) * 1997-07-10 2002-05-21 Honeywell International Inc. Constant volume damper
JPH1163081A (en) * 1997-08-27 1999-03-05 Sanwa Tekki Corp Vibration frequency sensitive hydraulic damping apparatus

Also Published As

Publication number Publication date
ES2248786T3 (en) 2006-03-16
FR2853708A1 (en) 2004-10-15
EP1467118A3 (en) 2004-11-03
DE602004000184D1 (en) 2005-12-22
EP1467118A2 (en) 2004-10-13
US7007588B2 (en) 2006-03-07
FR2853708B1 (en) 2005-05-27
DE602004000184T2 (en) 2006-06-29
US20040255772A1 (en) 2004-12-23

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