EP2505852B1 - Hydraulic actuator with automatic drain at end of travel - Google Patents

Hydraulic actuator with automatic drain at end of travel Download PDF

Info

Publication number
EP2505852B1
EP2505852B1 EP12162285.6A EP12162285A EP2505852B1 EP 2505852 B1 EP2505852 B1 EP 2505852B1 EP 12162285 A EP12162285 A EP 12162285A EP 2505852 B1 EP2505852 B1 EP 2505852B1
Authority
EP
European Patent Office
Prior art keywords
rod
needle
valve
crosspiece
shut
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
EP12162285.6A
Other languages
German (de)
French (fr)
Other versions
EP2505852A1 (en
Inventor
Xavier Jubert
Ludovic Dufay
Sébastien Ernis
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 Landing Systems SAS
Original Assignee
Safran Landing Systems SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Safran Landing Systems SAS filed Critical Safran Landing Systems SAS
Publication of EP2505852A1 publication Critical patent/EP2505852A1/en
Application granted granted Critical
Publication of EP2505852B1 publication Critical patent/EP2505852B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • 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
    • 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
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

Definitions

  • the invention relates to a hydraulic actuator with automatic bleeding end of stroke.
  • automatic purge hydraulic actuators comprising a hollow body defining a cylindrical cavity, a rod slidably mounted in the hollow body between two extreme positions, the rod defining an internal passage between two chambers of the cylindrical cavity, said passage being equipped with a valve having a shutter member for opening and closing the passage.
  • This type of actuator allows a purge of the air contained in one of the chambers when the rod reaches the end of the race in one of its extreme positions.
  • the invention relates to a hydraulic actuator with automatic purge, allowing a purge of the air contained in one of the chambers thereof at least when the rod reaches the end of the race.
  • the opening of the purge valve is automatic and systematic every time the rod reaches the end of the race.
  • the valve remains open while the rod remains at the end of the race.
  • the pusher member comprises a needle slidably mounted in the rod in a direction parallel to the axis of sliding of the rod, the needle having a distal end close to the valve and a proximal end close to a cross member. floating climb through the rod in a longitudinal slot thereof to protrude on both sides of the rod so that when the rod reaches the end of the race, the ends of the cross support against the part opposite the hollow body, pushing the cross relative to the needle so that it in turn pushes the needle, which in turn pushes the shutter member of the valve to force it to open.
  • the actuator of the invention is illustrated here in the form of a jack single acting hydraulic cylinder comprising a cylinder 1 defining a cylindrical cavity 2 of Z axis emerging which is closed by a sealing cap 3, here held in place on the body by a rod 4.
  • the assembly of the cylinder 1 and the cap 3 form a hollow body.
  • a rod 5 is slidably mounted inside the body 1 along the Z axis.
  • the rod 5 extends projecting from the body on both sides, passing through the plug 3.
  • the rod 5 forms a piston 6 delimiting in the cavity 2 two chambers C1 and C2 (the chamber C1 is more visible on the figure 3 ).
  • the chamber C1 is connected to an external source of pressure by a supply port 7, while the chamber C2 is connected to a return port 8.
  • the rod 5 is returned to the retracted position, illustrated in FIG. figure 1 by means of a spring 9 bearing on the one hand on the body 1 and on the other hand on a cup 10 integral with the rod 5.
  • the rod 5 is hollow and defines an internal cavity 11 opening closed sealing by a plug 12. As is more visible in the figure 4 , the rod comprises a transverse transverse light 13, extending here astride the redan delimiting the end of the piston 6.
  • a cross member 15 (visible at the end on the figure 4 ) which extends to protrude from either side of the rod 5.
  • the piston 6 abuts against the plug 3 and the ends of the crosspiece 15 bear against the plug 3 so that the cross member 15 is moved longitudinally relative to the rod 5.
  • the light 13 is sufficiently high so that, when the piston 6 bears against the plug 3, the crosspiece 15 does not rest against the top of the light 13.
  • the light 13 communicates the chamber C2 with the internal cavity 11 of the rod 5. Moreover, a bore 16 communicates the internal cavity 11 and the chamber C1, so that the rod 5 defines a fluid passage between the chambers C1 and C2. This passage is closed by a purge valve 20 comprising a ball 21 returned to a seat 22 by a spring 23.
  • the seat 22 is part of a series of inserted elements fitted into the cavity 11 and resting on a shoulder 27 of the cavity 11, and respectively comprising a strainer 27, a cage 29 receiving the spring 23, the seat 22, a jumper 12 dug to allow the floating of the crosspiece 15 in the slot 13, and finally the plug 12, screwed into a tapping of the inner cavity 11.
  • the seat 22 has an axial bore 25 closed by the ball 21 and wherein a needle 26 is slidably fitted. The fit is not airtight.
  • the needle has a distal end that extends near the ball 21, and a proximal end extending near the cross member 15. The length of the needle 26 is chosen so that when the crosspiece 15 is not pushed by the cap 3, the needle is floating between the crosspiece 15 and the ball 21, so that the needle 26 is spaced from the ball 21. The latter is then held against the seat 22 by the spring 23.
  • the cross member 15 when the cross member 15 is pushed back by the plug 3 (that is to say when the rod is in the extended position as on the figure 3 ), the crosspiece 15 pushes the needle 26 which acts on the ball 21 to detach it from the seat 22 against the spring 23.
  • the purge valve 20 is kept open when the rod 5 is in the extended position, this which allows the air purge contained in the chamber C2 which can then pass through the passage defined by the rod 5 between the bedrooms C1 and C2.
  • the pusher member which opens the valve comprises a crossbar and a needle
  • the invention covers any actuator comprising a pusher member which cooperates with the hollow body when the rod arrives in one of its extreme positions to push back the shutter member of the valve.
  • valve is a ball valve

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Lift Valve (AREA)

Description

L'invention est relative à un actionneur hydraulique avec purge automatique en fin de course.The invention relates to a hydraulic actuator with automatic bleeding end of stroke.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

On connaît, notamment du document JP 62 130204 U , des actionneurs hydrauliques à purge automatique comportant un corps creux définissant une cavité cylindrique, une tige montée coulissante dans le corps creux entre deux positions extrêmes, la tige définissant un passage intérieur entre deux chambres de la cavité cylindrique, ledit passage étant équipé d'un clapet comportant un organe d'obturation pour ouvrir et fermer le passage. Ce type d'actionneur permet une purge de l'air contenu dans l'une des chambres lorsque la tige arrive en fin de course dans l'une de ses positions extrêmes.We know, particularly from the document JP 62 130204 U , automatic purge hydraulic actuators comprising a hollow body defining a cylindrical cavity, a rod slidably mounted in the hollow body between two extreme positions, the rod defining an internal passage between two chambers of the cylindrical cavity, said passage being equipped with a valve having a shutter member for opening and closing the passage. This type of actuator allows a purge of the air contained in one of the chambers when the rod reaches the end of the race in one of its extreme positions.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour objet un actionneur hydraulique à purge automatique, permettant une purge de l'air contenu dans l'une des chambres de celui-ci au moins lorsque la tige arrive en fin de course.The invention relates to a hydraulic actuator with automatic purge, allowing a purge of the air contained in one of the chambers thereof at least when the rod reaches the end of the race.

BREVE DESCRIPTION DE L'INVENTIONBRIEF DESCRIPTION OF THE INVENTION

A cet effet, on propose un actionneur hydraulique comportant :

  • un corps creux définissant une cavité cylindrique ;
  • un tige montée coulissante dans le corps selon un axe de coulissement entre deux positions extrêmes et solidaire d'un piston coulissant à étanchéité dans la cavité cylindrique du corps pour y définir deux chambres. Selon l'invention, la tige définit un passage intérieur reliant les deux chambres, ce passage étant équipé d'un clapet de purge comportant un organe d'obturation rappelé vers un siège et coopérant avec ce dernier pour fermer le passage, la tige recevant un organe poussoir mobile relativement à la tige entre une position dans laquelle il est écarté de l'organe d'obturation du clapet et une position dans laquelle il force l'ouverture de l'organe d'obturation, l'organe poussoir étant contraint dans cette dernière position lorsque la tige arrive en fin de course dans l'une de ses positions extrêmes par coopération de l'organe poussoir avec une partie du corps creux.
For this purpose, there is provided a hydraulic actuator comprising:
  • a hollow body defining a cylindrical cavity;
  • a rod slidably mounted in the body along an axis of sliding between two extreme positions and secured to a sliding piston sealing in the cylindrical cavity of the body to define two chambers. According to the invention, the rod defines an internal passage connecting the two chambers, this passage being equipped with a purge valve comprising a shutter member biased towards a seat and cooperating with it to close the passage, the stem receiving a pusher member movable relative to the rod between a position in which it is spaced from the closure member of the valve and a position in which it forces the opening of the closure member, the pusher member being constrained in this last position when the rod reaches the end of stroke in one of its extreme positions by cooperation of the pusher member with a portion of the hollow body.

Ainsi, l'ouverture du clapet de purge est automatique et systématique à chaque fois que la tige arrive en fin de course. Le clapet reste alors ouvert tant que la tige reste en fin de course.Thus, the opening of the purge valve is automatic and systematic every time the rod reaches the end of the race. The valve remains open while the rod remains at the end of the race.

Selon l'invention, l'organe poussoir comporte une aiguille montée coulissante dans la tige selon une direction parallèle à l'axe de coulissement de la tige, l'aiguille ayant une extrémité distale proche du clapet et une extrémité proximale proche d'une traverse montée flottante au travers de la tige dans une lumière longitudinale de celle-ci pour dépasser de part et d'autre de la tige de sorte que, lorsque la tige arrive en fin de course, des extrémités de la traverse viennent en appui contre la partie en regard du corps creux, poussant la traverse relativement à l'aiguille de sorte que celle-ci pousse à son tour l'aiguille, qui pousse à son tour l'organe d'obturation du clapet pour le forcer à s'ouvrir.According to the invention, the pusher member comprises a needle slidably mounted in the rod in a direction parallel to the axis of sliding of the rod, the needle having a distal end close to the valve and a proximal end close to a cross member. floating climb through the rod in a longitudinal slot thereof to protrude on both sides of the rod so that when the rod reaches the end of the race, the ends of the cross support against the part opposite the hollow body, pushing the cross relative to the needle so that it in turn pushes the needle, which in turn pushes the shutter member of the valve to force it to open.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

L'invention sera mieux comprise à la lumière de la description qui suit d'un mode particulier de réalisation de l'invention, en référence aux figures des dessins annexés parmi lesquels :

  • la figure 1 est une vue en coupe longitudinale d'un vérin simple effet, la tige étant représentée dans la position rentrée vers laquelle elle est élastiquement rappelée ;
  • la figure 2 est une vue en coupe longitudinale du vérin de la figure 1 selon un plan perpendiculaire au plan de coupe de la figure 1 ;
  • la figure 3 est une vue en coupe longitudinale analogue à la figure 2, la tige ayant été repoussée hydrauliquement en position sortie ;
  • la figure 4 est une vue externe agrandie de la tige dans la position illustrée à la figure 1, selon le même angle de vue ;
  • la figure 5 est une vue de détail selon le détail de la figure 3.
The invention will be better understood in the light of the following description of a particular embodiment of the invention, with reference to the figures of the appended drawings in which:
  • the figure 1 is a longitudinal sectional view of a single-acting cylinder, the rod being shown in the retracted position to which it is elastically recalled;
  • the figure 2 is a longitudinal sectional view of the cylinder of the figure 1 in a plane perpendicular to the section plane of the figure 1 ;
  • the figure 3 is a longitudinal sectional view similar to the figure 2 the rod having been hydraulically pushed back into the extended position;
  • the figure 4 is an enlarged external view of the rod in the position illustrated in FIG. figure 1 according to the same angle of view;
  • the figure 5 is a detail view according to the detail of the figure 3 .

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence aux figures 1 et 2, l'actionneur de l'invention est illustré ici sous la forme d'un vérin hydraulique simple effet comportant un cylindre 1 définissant une cavité cylindrique 2 d'axe Z débouchante qui est fermée à étanchéité par un bouchon 3, ici maintenu en place sur le corps par un jonc 4. L'ensemble du cylindre 1 et du bouchon 3 forme un corps creux.With reference to Figures 1 and 2 , the actuator of the invention is illustrated here in the form of a jack single acting hydraulic cylinder comprising a cylinder 1 defining a cylindrical cavity 2 of Z axis emerging which is closed by a sealing cap 3, here held in place on the body by a rod 4. The assembly of the cylinder 1 and the cap 3 form a hollow body.

Une tige 5 est montée à coulissement étanche à l'intérieur du corps 1 selon l'axe Z . Ici, la tige 5 s'étend en saillie du corps des deux côtés, en passant au travers du bouchon 3. La tige 5 forme un piston 6 délimitant dans la cavité 2 deux chambres C1 et C2 (la chambre C1 est plus visible sur la figure 3). La chambre C1 est reliée à une source externe de pression par un port d'alimentation 7, tandis que la chambre C2 est reliée à un port de retour 8. La tige 5 est rappelée en position rentrée, illustrée à la figure 1, au moyen d'un ressort 9 prenant appui d'une part sur le corps 1 et d'autre part sur une coupelle 10 solidaire de la tige 5.A rod 5 is slidably mounted inside the body 1 along the Z axis. Here, the rod 5 extends projecting from the body on both sides, passing through the plug 3. The rod 5 forms a piston 6 delimiting in the cavity 2 two chambers C1 and C2 (the chamber C1 is more visible on the figure 3 ). The chamber C1 is connected to an external source of pressure by a supply port 7, while the chamber C2 is connected to a return port 8. The rod 5 is returned to the retracted position, illustrated in FIG. figure 1 by means of a spring 9 bearing on the one hand on the body 1 and on the other hand on a cup 10 integral with the rod 5.

La tige 5 est creuse et définit une cavité interne 11 débouchante fermée à étanchéité par un bouchon 12. Comme cela est plus visible à la figure 4, la tige comporte une lumière transversale traversante 13, s'étendant ici à cheval sur le redan délimitant l'extrémité du piston 6.The rod 5 is hollow and defines an internal cavity 11 opening closed sealing by a plug 12. As is more visible in the figure 4 , the rod comprises a transverse transverse light 13, extending here astride the redan delimiting the end of the piston 6.

Dans la lumière 13 s'étend une traverse 15 (visible en bout sur la figure 4) qui s'étend pour dépasser de par et d'autre de la tige 5. Lorsque la tige 5 est poussée en position sortie (telle qu'illustrée à la figure 3) par alimentation du port 7, le piston 6 vient en appui contre le bouchon 3 et les extrémités de la traverse 15 prennent appui sur le bouchon 3 de sorte que la traverse 15 est déplacée longitudinalement relativement à la tige 5. On remarquera à la figure 4 que la lumière 13 est suffisamment haute pour que, lorsque le piston 6 est en appui contre le bouchon 3, la traverse 15 n'est pas en appui contre le haut de la lumière 13.In the light 13 extends a cross member 15 (visible at the end on the figure 4 ) which extends to protrude from either side of the rod 5. When the rod 5 is pushed into the extended position (as illustrated in FIG. figure 3 ) by supplying the port 7, the piston 6 abuts against the plug 3 and the ends of the crosspiece 15 bear against the plug 3 so that the cross member 15 is moved longitudinally relative to the rod 5. It will be noted at the figure 4 that the light 13 is sufficiently high so that, when the piston 6 bears against the plug 3, the crosspiece 15 does not rest against the top of the light 13.

La lumière 13 met en communication la chambre C2 avec la cavité interne 11 de la tige 5. Par ailleurs, un perçage 16 met en communication la cavité interne 11 et la chambre C1, de sorte que la tige 5 définit un passage fluidique entre les chambres C1 et C2. Ce passage est fermé par un clapet 20 de purge comportant une bille 21 rappelée vers un siège 22 par un ressort 23.The light 13 communicates the chamber C2 with the internal cavity 11 of the rod 5. Moreover, a bore 16 communicates the internal cavity 11 and the chamber C1, so that the rod 5 defines a fluid passage between the chambers C1 and C2. This passage is closed by a purge valve 20 comprising a ball 21 returned to a seat 22 by a spring 23.

Le siège 22 fait partie d'une suite d'éléments insérés à ajustement dans la cavité 11 et venant s'appuyer sur un épaulement 27 de la cavité 11, et comportant respectivement une crépine 27, une cage 29 recevant le ressort 23, le siège 22, un cavalier 12 creusé pour permettre le flottement de la traverse 15 dans la lumière 13, et enfin le bouchon 12, vissé dans un taraudage de la cavité interne 11.The seat 22 is part of a series of inserted elements fitted into the cavity 11 and resting on a shoulder 27 of the cavity 11, and respectively comprising a strainer 27, a cage 29 receiving the spring 23, the seat 22, a jumper 12 dug to allow the floating of the crosspiece 15 in the slot 13, and finally the plug 12, screwed into a tapping of the inner cavity 11.

Le siège 22 comporte un alésage axial 25 fermé par la bille 21 et dans lequel une aiguille 26 est montée coulissante à ajustement. L'ajustement n'est pas étanche à l'air. L'aiguille a une extrémité distale qui s'étend à proximité de la bille 21, et une extrémité proximale s'étendant à proximité de la traverse 15. La longueur de l'aiguille 26 est choisie pour que lorsque la traverse 15 n'est pas repoussée par le bouchon 3, l'aiguille est flottante entre la traverse 15 et la bille 21, de sorte que l'aiguille 26 est écartée de la bille 21. Cette dernière est alors maintenue contre le siège 22 par le ressort 23. Au contraire, lorsque la traverse 15 est repoussée par le bouchon 3 (c'est-à-dire lorsque la tige est en position sortie comme sur la figure 3), la traverse 15 repousse l'aiguille 26 qui agit sur la bille 21 pour la décoller du siège 22 à l'encontre du ressort 23. Ainsi, le clapet de purge 20 est maintenu ouvert lorsque la tige 5 est en position sortie, ce qui permet la purge d'air contenu dans la chambre C2 qui peut dès lors passer par le passage défini par la tige 5 entre les chambres C1 et C2.The seat 22 has an axial bore 25 closed by the ball 21 and wherein a needle 26 is slidably fitted. The fit is not airtight. The needle has a distal end that extends near the ball 21, and a proximal end extending near the cross member 15. The length of the needle 26 is chosen so that when the crosspiece 15 is not pushed by the cap 3, the needle is floating between the crosspiece 15 and the ball 21, so that the needle 26 is spaced from the ball 21. The latter is then held against the seat 22 by the spring 23. At contrary, when the cross member 15 is pushed back by the plug 3 (that is to say when the rod is in the extended position as on the figure 3 ), the crosspiece 15 pushes the needle 26 which acts on the ball 21 to detach it from the seat 22 against the spring 23. Thus, the purge valve 20 is kept open when the rod 5 is in the extended position, this which allows the air purge contained in the chamber C2 which can then pass through the passage defined by the rod 5 between the bedrooms C1 and C2.

Lorsque la tige 5 est rappelée par le ressort 9 en position rentrée, la traverse 15 n'est plus repoussée et cesse donc son action sur l'aiguille 26, de sorte que le clapet de purge 20 se referme automatiquement.When the rod 5 is returned by the spring 9 in the retracted position, the cross member 15 is no longer pushed and therefore stops its action on the needle 26, so that the purge valve 20 closes automatically.

L'invention n'est pas limitée à ce qui vient d'être décrit, mais englobe au contraire toute variante entrant dans le cadre défini par les revendications.The invention is not limited to what has just been described, but on the contrary covers any variant within the scope defined by the claims.

En particulier, bien qu'ici l'organe poussoir qui ouvre le clapet comporte une traverse et une aiguille, l'invention couvre tout actionneur comportant un organe poussoir qui coopère avec le corps creux lorsque la tige arrive dans l'une de ses positions extrêmes pour repousser l'organe d'obturation du clapet.In particular, although here the pusher member which opens the valve comprises a crossbar and a needle, the invention covers any actuator comprising a pusher member which cooperates with the hollow body when the rod arrives in one of its extreme positions to push back the shutter member of the valve.

Bien qu'ici le clapet soit un clapet à bille, on pourra bien évidemment utiliser toute autre sorte de clapet, comme un clapet à pointeau.Although here the valve is a ball valve, we can obviously use any other kind of valve, such as a needle valve.

Claims (1)

  1. Hydraulic actuator comprising
    - a hollow body (1, 3) defining a cylindrical cavity;
    - a rod (5) which is mounted so as to be able to slide within the body along a sliding axis between two end positions and which is integral with a piston sliding in a sealed manner within the cylindrical cavity of the body in order to define two chambers (C1, C2) therein; the rod defining an interior passage connecting the two chambers, this passage being equipped with a valve (20) comprising a shut-off member (21) which is returned towards a seat (22) and which engages with the latter to close the passage, the rod receiving a push member (15, 26) which can move relative to the rod between a position in which it is moved apart from the shut-off member (21) of the valve and a position in which it forces the shut-off member to open, the push member being constrained in the latter position when the rod reaches the end of its stroke in one of its end positions as a result of the push member engaging with a portion (3) of the hollow body,
    characterized in that the push member (15, 26) comprises a needle (26) which is mounted so as to be able to slide within the rod in a direction parallel to the sliding axis of the rod, the needle having a distal end close to the valve and a proximal end close to a crosspiece (15) which is floatingly mounted across the rod in a longitudinal slot (13) therein so as to project to either side of the rod such that, when the rod reaches the end of its stroke, ends of the crosspiece will bear against the facing portion (3) of the hollow body, pushing the crosspiece relative to the needle such that said crosspiece in turn pushes the needle, which in turn pushes the shut-off member of the valve to force it to open.
EP12162285.6A 2011-03-31 2012-03-29 Hydraulic actuator with automatic drain at end of travel Active EP2505852B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1152770A FR2973454B1 (en) 2011-03-31 2011-03-31 HYDRAULIC ACTUATOR WITH AUTOMATIC PURGE AT THE END OF THE RACE.

Publications (2)

Publication Number Publication Date
EP2505852A1 EP2505852A1 (en) 2012-10-03
EP2505852B1 true EP2505852B1 (en) 2017-08-23

Family

ID=45878017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12162285.6A Active EP2505852B1 (en) 2011-03-31 2012-03-29 Hydraulic actuator with automatic drain at end of travel

Country Status (6)

Country Link
US (1) US9151303B2 (en)
EP (1) EP2505852B1 (en)
CN (1) CN102734258B (en)
BR (1) BR102012007169B1 (en)
CA (1) CA2773202C (en)
FR (1) FR2973454B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10280946B2 (en) * 2016-05-20 2019-05-07 Greenlee Tools, Inc. Adapter for mounting a cylinder for a fluid powered linear actuator to a fluid channel
WO2021040515A1 (en) * 2019-08-23 2021-03-04 Holmatro B.V. Method for selectively coupling or uncoupling a coupling, and a coupling therefor
EP3792504B1 (en) 2019-09-12 2023-06-07 Ratier-Figeac SAS Hydraulic actuator end stroke stop pressure/load control
CN111425484A (en) * 2020-04-17 2020-07-17 河海大学常州校区 Oil cylinder tail end buffering device
CN111425483B (en) * 2020-04-17 2022-04-22 河海大学常州校区 Oil cylinder tail end buffering device

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1211772A (en) * 1958-10-08 1960-03-18 Forest & Cie Improvement in hydraulic control systems, especially for machine tools
GB1121858A (en) * 1965-01-07 1968-07-31 Peco Machinery Ltd Improvements in or relating to press mechanisms
GB1243082A (en) * 1968-10-01 1971-08-18 Webley & Scott Ltd Improvements relating to fluid-powered piston and cylinder units
FR2288896A1 (en) * 1974-10-21 1976-05-21 Poclain Sa CYLINDER
FR2463307A1 (en) * 1979-08-08 1981-02-20 Outillage Air Comprime Security device for linear actuator on machine tools - has non return valve inside piston rod which equalises pressure on either side of piston
JPS56138206U (en) * 1980-03-19 1981-10-20
JPS62130204U (en) * 1986-02-07 1987-08-17
JPH08312609A (en) * 1995-05-22 1996-11-26 Toyooki Kogyo Co Ltd Hydraulic cylinder with air vent mechanism
CN2591306Y (en) * 2002-11-01 2003-12-10 洪晔 Hydraulic synchronous oil cylinder with automatic feeding (discharging) liquid zero resetting apparatus
CN100464080C (en) * 2006-03-08 2009-02-25 利安鑫企业有限公司 Oil-pressure driving device of lifting machine
CN201347919Y (en) * 2008-12-05 2009-11-18 韶关液压件厂有限公司 Hydraulic cylinder with integrated one-way throttling device
CN201696393U (en) * 2009-12-31 2011-01-05 胡海华 speed regulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR2973454B1 (en) 2014-03-28
CA2773202C (en) 2014-03-18
CN102734258A (en) 2012-10-17
BR102012007169B1 (en) 2021-03-16
US9151303B2 (en) 2015-10-06
CA2773202A1 (en) 2012-09-30
EP2505852A1 (en) 2012-10-03
CN102734258B (en) 2015-12-09
US20120247318A1 (en) 2012-10-04
FR2973454A1 (en) 2012-10-05

Similar Documents

Publication Publication Date Title
EP2505852B1 (en) Hydraulic actuator with automatic drain at end of travel
EP0777049B1 (en) Pump connection device
EP2591273B1 (en) Filling connector, corresponding container and corresponding filling method
EP2738437B1 (en) Fluid connector
EP2088358A1 (en) Female connection element and quick connection including such an element
EP2870516B1 (en) Pressure-reducing valve having a residual pressure function built into the valve
EP0805278B1 (en) Pneumatic actuating device
CH621613A5 (en)
FR3037548A1 (en) MASTER CYLINDER TANDEM
EP2674651B1 (en) Delayed mixing valve with adjustable flow duration.
EP2891825A2 (en) Telescopic actuator
FR2855239A1 (en) Hydraulic fluid pipe fitting, has joints provided between tubular and coupling parts to delimit chambers which are placed in communication during coupling phase, by groove when coupling part is in coupled or decoupled position
EP3019118B1 (en) Device for injecting fluid in animals, in particular by intranasal administration
EP2836336B1 (en) Device for clamping a workpiece on a tool
WO2016139158A1 (en) Hydraulic control device
FR2738896A1 (en) QUICK CONNECT FOR PRESSURE FLUID LINES
FR2767221A1 (en) SELF-BLOWING AND REDUCED COMPRESSION CIRCUIT BREAKER
WO1991015409A1 (en) Device for automatic delivery of any product or object
EP1937983B1 (en) Valve with cushioned opening system
FR2955170A1 (en) Gas expander integrated tap for use in pressurized gas cylinder, has push-valve and pressure valve arranged in same housing of body, where push-valve is selectively moved independent of pressure valve for actuating insulation valve
FR2575526A1 (en) FUNCTIONAL CONNECTOR ASSEMBLY FOR PNEUMATIC HANDLE WITH COMBINED ASSEMBLY TO PROVIDE TWO FUNCTIONS AT LEAST
FR3008150A1 (en) PISTON BRAKE DEVICE WITH TOTAL REVERSE FUNCTION
EP3032159B1 (en) Fluid connection system
FR2522084A1 (en) Fluid actuator with auxiliary distributor - feed second actuator in unison with rod movements of first
FR2950939A1 (en) MANUAL AIR PUMP WITH OPTIMIZED COMPRESSION

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20130402

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SAFRAN LANDING SYSTEMS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SAFRAN LANDING SYSTEMS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20170313

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 921665

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170915

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602012036184

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170823

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 921665

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170823

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171123

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171123

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171223

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171124

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602012036184

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20180524

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20180331

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180331

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20120329

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170823

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170823

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20240220

Year of fee payment: 13

Ref country code: GB

Payment date: 20240220

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20240221

Year of fee payment: 13