EP1111248B1 - Actuator with locked intermediate position - Google Patents

Actuator with locked intermediate position Download PDF

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Publication number
EP1111248B1
EP1111248B1 EP00403557A EP00403557A EP1111248B1 EP 1111248 B1 EP1111248 B1 EP 1111248B1 EP 00403557 A EP00403557 A EP 00403557A EP 00403557 A EP00403557 A EP 00403557A EP 1111248 B1 EP1111248 B1 EP 1111248B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
shuttle
actuator according
chamber
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.)
Expired - Lifetime
Application number
EP00403557A
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German (de)
French (fr)
Other versions
EP1111248A1 (en
Inventor
Jean Michel Godart
Bruno Villemin
Roland Martinet
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.)
Parker Hannifin SA
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Parker Hannifin SA
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Publication date
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Publication of EP1111248A1 publication Critical patent/EP1111248A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/122—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with multiple stops
    • 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
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/765—Control of position or angle of the output member
    • F15B2211/7653—Control of position or angle of the output member at distinct positions, e.g. at the end position

Definitions

  • the present invention relates generally to a cylinder, and, in its preferred embodiment, a cylinder double-acting.
  • the invention relates to a jack comprising at least a first working chamber at variable volume delimited by a cylinder of length determined, by a first bottom wall of the cylinder, and by a first face of a piston selectively moved in the cylinder, from a rest position corresponding to a minimum volume of the first chamber to an extreme position, by means of a fluid under pressure injected into the first chamber, the piston being extended by an actuating rod external to the first chamber and protruding from the cylinder.
  • Cylinders of this type have been known for a long time and find application in many areas of the technique.
  • the main objective of the invention is therefore to propose a structural cylinder simple and nevertheless meets this requirement in a way satisfactory.
  • a first accessory objective of the invention is to propose a jack whose structure allows, so simple, to define the intermediate stop position of the actuating rod during the construction of the cylinder.
  • a second accessory objective of the invention is to offer a cylinder in which the stop position the actuating rod can be defined at any point between the extreme positions of this rod.
  • a third accessory objective of the invention is to propose a jack in which the stop position the actuating rod can be defined with relatively high precision.
  • a fourth accessory objective of the invention is to provide a jack whose size either reduced and independent of the choice of intermediate stop position of the actuating rod.
  • the cylinder of the invention moreover conforms to the generic definition given by the preamble above, is characterized according to claim 1.
  • this cylinder comprises a second working chamber delimited by the cylinder, by a second face of the piston, and by a second bottom wall of the cylinder, this second wall being traversed so sealed by the actuating rod.
  • the liaison body comprises, for example, one or more several rigid connecting rod (s), mounted sliding (s) tightly through the piston, or in the actuating rod if it is hollow, between first and second stops.
  • the shuttle comprises a body essentially cylindrical and the retainers axial include balls stressed by force radial elastic and selectively bearing, for a limit position adopted by the shuttle at least when the piston is in its intermediate position, on an inclined surface of the shuttle body.
  • the axial retaining members can include an essentially cylindrical pusher, axially stressed in the housing by a spring prestressed in the direction of the piston, and having a conical ramp which, at least in the limit position of the shuttle, is supported on the balls.
  • the tapered ramp of the pusher flares towards piston while the inclined surface of the shuttle body is substantially frustoconical and converges towards the piston.
  • the pusher can delimit in the housing of the first and second auxiliary chambers, waterproof to each other and the second of which communicates with the first working chamber through the passage, which results in the balls ceasing to be pressed against the inclined surface of the body of the shuttle by the radial elastic force when the pressurized fluid injected into the first chamber of work exerts on the pusher sufficient force to compress the prestressed spring.
  • the inclined surface of the shuttle body can then be transversely terminated by a rear face and the axial retaining members may include a core shouldered, elastically pressed against the rear face of the shuttle body, of which an anterior part substantially cylindrical takes the place of the surface tilted to keep the balls in position radial they adopt when the shuttle leaves its resting state.
  • the axial retaining members advantageously comprise a front support of the casing, serving as an axial stop for the balls, and the core is preferably mounted sliding in the pusher and guided by him.
  • the cylinder essentially comprises a cylinder 2 in which a sliding piston 3 defines a working chamber rear 11 and a front working chamber 12.
  • Cylinder 2 is closed at its rear ends and before by respective bottom walls, 21 and 22, separated from each other by a distance L0 representing the length of the cylinder.
  • the rear working chamber 11 is thus located defined in cylinder 2 between a rear face 31 of the piston 3 and the rear bottom wall 21 of the cylinder, the working chamber before 12 being defined in the cylinder 2 between a front face 32 of the piston 3 and the front bottom wall 22 of the cylinder.
  • Cylinder 2 is drilled in each of the chambers 11 and 12, of an injection and delivery orifice, such that 61, 23, by which a pressurized fluid can be injected into or be ejected from this chamber, piston 3 can thus be moved in cylinder 2 from a rest position which corresponds to a minimum volume of the rear chamber 11 (FIGS. 1 and 4), up to a extreme actuation position corresponding to a volume maximum of this chamber 11 ( Figures 3 and 6).
  • the piston 3 is extended by a rod actuator 4, which is external to the rear chamber 11, which protrudes from cylinder 2 by crossing sealingly the front bottom wall 22 of the cylinder, and which therefore adopts a position imposed by that of the piston.
  • the jack according to the invention is remarkable in that that it essentially comprises a connecting member 5 which, at least in the particular embodiments illustrated, takes the form of one or more rods rigid, and a retainer 678, this device itself comprising a casing 6, retaining members axial 7, and a shuttle 8.
  • the or each connecting rod 5 has a length L less than the length L0 of the cylinder, is disposed in the cylinder 2, and connects the piston 3 to the shuttle 8.
  • the cylinder of the invention can, as shown by Figures 1 to 3, or use several connecting rods 5 sliding climbs tightly across the piston 3 between first and second stops 91a, 91b, either, if the actuating rod 4 is hollow, use a single connecting rod 5 slidably mounted in the actuating rod, between first and second stops 92a, 92b, as shown in Figures 4 to 6.
  • the casing 6 is adjacent to the rear bottom wall 21 of the cylinder, is arranged outside the chamber 11 rear, and contains the axial retaining members 7.
  • the shuttle 8 is either in a state of rest, illustrated in the figures 1, 2, 4, and 5, for which it is housed in the housing 6, either in a free state, which is illustrated in the figures 3 and 6, and which it reaches by crossing a passage 61 open between housing 6 and the rear working chamber 11.
  • the shuttle 8 is placed in its rest state, in particular when the piston 3 is in its rest position, and is moved from its state of rest when the piston exceeds a position intermediate between its rest position and its position extreme, this intermediate position being illustrated in Figures 2 and 5.
  • the axial retaining members 7 have the function to exercise on shuttle 8, in its resting state ( Figures 2 and 5), an axial retaining force Fx of limited amplitude opposing a displacement of the shuttle 8 out of its resting state.
  • shuttle 8 can include a body 80 extended, backwards, by a surface inclined 81 radially divergent, and the organs of axial retention 7 comprise for example balls 71a, 71b stressed by a radial elastic force centripetal Fr and bearing on the inclined surface 81 for a limit position of shuttle 8 such as illustrated in Figures 2 and 5.
  • shuttle 8 rest is defined as an energy state and that the shuttle can therefore remain in its resting state in several different axial positions (for example illustrated in Figures 1 and 2, 4 and 5), as is the case when the body 80 of the shuttle is cylindrical.
  • FIGS. 2 and 5 are limit positions, precisely defined by the length of the connecting rod (s), and is located at the border between the state of rest and the free state of shuttle 8.
  • the balls 71a, 71b can be pushed by a conical ramp 720 defined on a cylindrical pusher 72, which is itself solicited, following a direction axial oriented from rear to front, by a spring prestressed 73 resting on the bottom of the casing 6.
  • the balls 71a, 71b are moreover maintained axially by a front support 62 of the casing 6, which makes forward axial stop office.
  • the 720 conical ramp pusher 72 flares towards piston 3, then that the inclined surface 81 of the body 8 of the shuttle, which is also substantially frustoconical, flares in reverse direction, and therefore converges towards the piston 3.
  • the pusher 72 itself forms a piston for the casing 6, that is to say that it delimits therein rear and front auxiliary chambers 601 and 602, waterproof against each other, the chamber auxiliary before 602 communicating with the rear work 11 through passage 61, and the chamber rear auxiliary 601 preferably opening onto the atmosphere by drilling 64.
  • the inclined surface 81 of the body 8 of shuttle ends with a rear transverse face 82, against which the front part is supported cylindrical 740 of a shouldered core 74.
  • the front part 740 of the core 74 takes the place of the inclined surface 81 for maintain the balls 71a, 71b in the radial position that they adopt when the shuttle 8 leaves its state of rest, so that the balls 71a, 71b resume spontaneously their place on the body 80 of the shuttle 8 when it returns to its resting state after to have left him.
  • the core 74 is preferably guided sliding inside the pusher 72 and biased by a spring 741 bearing in the bottom of this pusher 72.
  • the cylinder can be actuated by injection of a pressurized fluid in the rear chamber 11, by example by injecting this fluid into an orifice 63 of the casing 6, which communicates with passage 61 open between the rear chamber 11 and the front auxiliary chamber 602 of the casing 6, which is otherwise assumed to be tight.
  • the prestressed spring 73 exercises on the shuttle, via the ramp conical 720 of pusher 72, a radial elastic force Fr including an axial component, developing by application of this elastic force Fr on the surface inclined 81 of the body 80 of the shuttle, constitutes a shuttle axial force Fx 8.
  • the cylinder can return to its resting state illustrated in Figure 2 by injecting fluid under pressure in the orifice 23 of the front chamber 12, the piston 3 then coming to bear on the stops 91b for push the shuttle 8 back to its illustrated position in Figure 1.

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  • 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)
  • Jib Cranes (AREA)
  • Vehicle Body Suspensions (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The power cylinder consists of a variable-volume working chamber (11) formed by a cylinder (2) and the end face (31) of a piston (3) with a rod (4), moved by a pressure fluid. The chamber contains a connector (5) providing an intermediate stop position for the piston, attached to a shuttle (8) held inside a housing (6) mounted on the end wall (21) of the cylinder and released to allow the piston to travel the full length of the cylinder. The shuttle is held in the housing by spring-loaded balls and released when the fluid pressure in the cylinder exceeds the effort of the spring (73).

Description

La présente invention concerne de façon générale un vérin, et, dans son mode de réalisation préféré, un vérin à double effet.The present invention relates generally to a cylinder, and, in its preferred embodiment, a cylinder double-acting.

Plus précisément, l'invention concerne un vérin comprenant au moins une première chambre de travail à volume variable délimitée par un cylindre de longueur déterminée, par une première paroi de fond du cylindre, et par une première face d'un piston sélectivement déplacé dans le cylindre, depuis une position de repos correspondant à un volume minimal de la première chambre jusqu'à une position extrême, au moyen d'un fluide sous pression injecté dans la première chambre, le piston étant prolongé par une tige d'actionnement externe à la première chambre et faisant saillie hors du cylindre.More specifically, the invention relates to a jack comprising at least a first working chamber at variable volume delimited by a cylinder of length determined, by a first bottom wall of the cylinder, and by a first face of a piston selectively moved in the cylinder, from a rest position corresponding to a minimum volume of the first chamber to an extreme position, by means of a fluid under pressure injected into the first chamber, the piston being extended by an actuating rod external to the first chamber and protruding from the cylinder.

Les vérins de ce type sont connus depuis longtemps et trouvent application dans de très nombreux domaines de la technique.Cylinders of this type have been known for a long time and find application in many areas of the technique.

Dans certaines de ces applications, il est nécessaire d'arrêter et de maintenir la tige d'actionnement dans une position fixe et bien définie, intermédiaire entre la position qu'elle adopte pour la position de repos du piston, et celle qu'elle adopte pour la position extrême du piston.In some of these applications, it is necessary to stop and maintain the rod actuation in a fixed and well-defined position, intermediary between the position it adopts for the piston rest position, and the one it adopts for the extreme position of the piston.

Dans ce contexte, le principal objectif de l'invention est donc de proposer un vérin de structure simple et répondant néanmoins à cette exigence de façon satisfaisante.In this context, the main objective of the invention is therefore to propose a structural cylinder simple and nevertheless meets this requirement in a way satisfactory.

Un premier objectif accessoire de l'invention est de proposer un vérin dont la structure permette, de façon simple, de définir la position d'arrêt intermédiaire de la tige d'actionnement lors de la construction du vérin.A first accessory objective of the invention is to propose a jack whose structure allows, so simple, to define the intermediate stop position of the actuating rod during the construction of the cylinder.

Un second objectif accessoire de l'invention est de proposer un vérin dans lequel la position d'arrêt intermédiaire de la tige d'actionnement puisse être définie en tout point entre les positions extrêmes de cette tige. A second accessory objective of the invention is to offer a cylinder in which the stop position the actuating rod can be defined at any point between the extreme positions of this rod.

Un troisième objectif accessoire de l'invention est de proposer un vérin dans lequel la position d'arrêt intermédiaire de la tige d'actionnement puisse être définie avec une précision relativement élevée.A third accessory objective of the invention is to propose a jack in which the stop position the actuating rod can be defined with relatively high precision.

Enfin, un quatrième objectif accessoire de l'invention est de proposer un vérin dont l'encombrement soit à la fois réduit et indépendant du choix de la position d'arrêt intermédiaire de la tige d'actionnement.Finally, a fourth accessory objective of the invention is to provide a jack whose size either reduced and independent of the choice of intermediate stop position of the actuating rod.

A cette fin, le vérin de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est caractérisé selon la revendication 1.To this end, the cylinder of the invention, moreover conforms to the generic definition given by the preamble above, is characterized according to claim 1.

Dans le cas fréquent où le vérin, après actionnement, doit pouvoir retourner de lui-même à sa position de repos sans assistance, et notamment sans l'aide d'un ressort qui serait comprimé par le vérin lors de son actionnement, ce vérin comprend une seconde chambre de travail délimitée par le cylindre, par une seconde face du piston, et par une seconde paroi de fond du cylindre, cette seconde paroi étant traversée de façon étanche par la tige d'actionnement.In the frequent case where the cylinder, after actuation, must be able to return by itself to its rest position without assistance, and in particular without using a spring which would be compressed by the cylinder during of its actuation, this cylinder comprises a second working chamber delimited by the cylinder, by a second face of the piston, and by a second bottom wall of the cylinder, this second wall being traversed so sealed by the actuating rod.

L'organe de liaison comprend par exemple une ou plusieurs tige(s) de liaison rigide(s), montée(s) coulissante(s) de façon étanche à travers le piston, ou dans la tige d'actionnement si elle est creuse, entre des première et seconde butées.The liaison body comprises, for example, one or more several rigid connecting rod (s), mounted sliding (s) tightly through the piston, or in the actuating rod if it is hollow, between first and second stops.

De préférence, la navette comprend un corps essentiellement cylindrique et les organes de retenue axiale comprennent des billes sollicitées par une force élastique radiale et venant sélectivement en appui, pour une position limite adoptée par la navette au moins lorsque le piston est dans sa position intermédiaire, sur une surface inclinée du corps de la navette.Preferably, the shuttle comprises a body essentially cylindrical and the retainers axial include balls stressed by force radial elastic and selectively bearing, for a limit position adopted by the shuttle at least when the piston is in its intermediate position, on an inclined surface of the shuttle body.

Dans ce cas, les organes de retenue axiale peuvent comprendre un poussoir essentiellement cylindrique, sollicité axialement dans le carter par un ressort précontraint en direction du piston, et présentant une rampe conique qui, au moins dans la position limite de la navette, est en appui sur les billes.In this case, the axial retaining members can include an essentially cylindrical pusher, axially stressed in the housing by a spring prestressed in the direction of the piston, and having a conical ramp which, at least in the limit position of the shuttle, is supported on the balls.

Dans le mode de réalisation préféré de l'invention, la rampe conique du poussoir s'évase en direction du piston alors que la surface inclinée du corps de navette est sensiblement tronconique et converge en direction du piston.In the preferred embodiment of the invention, the tapered ramp of the pusher flares towards piston while the inclined surface of the shuttle body is substantially frustoconical and converges towards the piston.

Par ailleurs, le poussoir peut délimiter dans le carter des première et seconde chambres auxiliaires, étanches l'une par rapport à l'autre et dont la seconde communique avec la première chambre de travail à travers le passage, ce dont il résulte que les billes cessent d'être sollicitées contre la surface inclinée du corps de la navette par la force élastique radiale lorsque le fluide sous pression injecté dans la première chambre de travail exerce sur le poussoir une force suffisante pour comprimer le ressort précontraint.Furthermore, the pusher can delimit in the housing of the first and second auxiliary chambers, waterproof to each other and the second of which communicates with the first working chamber through the passage, which results in the balls ceasing to be pressed against the inclined surface of the body of the shuttle by the radial elastic force when the pressurized fluid injected into the first chamber of work exerts on the pusher sufficient force to compress the prestressed spring.

La surface inclinée du corps de navette peut alors être transversalement terminée par une face arrière et les organes de retenue axiale peuvent comprendre un noyau épaulé, élastiquement sollicité contre la face arrière du corps de navette, et dont une partie antérieure sensiblement cylindrique prend la place de la surface inclinée pour maintenir les billes dans la position radiale qu'elles adoptent lorsque la navette quitte son état de repos.The inclined surface of the shuttle body can then be transversely terminated by a rear face and the axial retaining members may include a core shouldered, elastically pressed against the rear face of the shuttle body, of which an anterior part substantially cylindrical takes the place of the surface tilted to keep the balls in position radial they adopt when the shuttle leaves its resting state.

Dans tous les cas, les organes de retenue axiale comprennent avantageusement un appui frontal du carter, servant de butée axiale aux billes, et le noyau est de préférence monté coulissant dans le poussoir et guidé par lui.In all cases, the axial retaining members advantageously comprise a front support of the casing, serving as an axial stop for the balls, and the core is preferably mounted sliding in the pusher and guided by him.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique en coupe d'un vérin conforme à un premier mode de réalisation de l'invention, représenté dans la position de repos du piston et de la tige d'actionnement;
  • la figure 2 est une vue schématique en coupe d'un vérin conforme à un premier mode de réalisation de l'invention, représenté dans la position d'arrêt intermédiaire du piston et de la tige d'actionnement;
  • la figure 3 est une vue schématique en coupe d'un vérin conforme à un premier mode de réalisation de l'invention, représenté dans la position d'actionnement extrême du piston et de la tige d'actionnement;
  • la figure 4 est une vue schématique en coupe d'un vérin conforme à un second mode de réalisation de l'invention, représenté dans la position de repos du piston et de la tige d'actionnement;
  • la figure 5 est une vue schématique en coupe d'un vérin conforme à un second mode de réalisation de l'invention, représenté dans la position d'arrêt intermédiaire du piston et de la tige d'actionnement; et
  • la figure 6 est une vue schématique en coupe d'un vérin conforme à un second mode de réalisation de l'invention, représenté dans la position d'actionnement extrême du piston et de la tige d'actionnement.
Other characteristics and advantages of the invention will emerge from the description given below, by way of indication and in no way limitative, with reference to the appended drawings, in which:
  • Figure 1 is a schematic sectional view of a cylinder according to a first embodiment of the invention, shown in the rest position of the piston and the actuating rod;
  • Figure 2 is a schematic sectional view of a cylinder according to a first embodiment of the invention, shown in the intermediate stop position of the piston and the actuating rod;
  • Figure 3 is a schematic sectional view of a cylinder according to a first embodiment of the invention, shown in the extreme actuation position of the piston and the actuating rod;
  • Figure 4 is a schematic sectional view of a cylinder according to a second embodiment of the invention, shown in the rest position of the piston and the actuating rod;
  • Figure 5 is a schematic sectional view of a cylinder according to a second embodiment of the invention, shown in the intermediate stop position of the piston and the actuating rod; and
  • Figure 6 is a schematic sectional view of a cylinder according to a second embodiment of the invention, shown in the extreme actuation position of the piston and the actuating rod.

Dans les deux modes de réalisation illustrés, le vérin comprend essentiellement un cylindre 2 dans lequel un piston coulissant 3 délimite une chambre de travail arrière 11 et une chambre de travail avant 12.In the two illustrated embodiments, the cylinder essentially comprises a cylinder 2 in which a sliding piston 3 defines a working chamber rear 11 and a front working chamber 12.

Le cylindre 2 est fermé à ses extrémités arrière et avant par des parois de fond respectives, 21 et 22, séparées l'une de l'autre par une distance L0 représentant la longueur du vérin.Cylinder 2 is closed at its rear ends and before by respective bottom walls, 21 and 22, separated from each other by a distance L0 representing the length of the cylinder.

La chambre de travail arrière 11 se trouve ainsi définie dans le cylindre 2 entre une face arrière 31 du piston 3 et la paroi de fond arrière 21 du cylindre, la chambre de travail avant 12 étant définie dans le cylindre 2 entre une face avant 32 du piston 3 et la paroi de fond avant 22 du cylindre.The rear working chamber 11 is thus located defined in cylinder 2 between a rear face 31 of the piston 3 and the rear bottom wall 21 of the cylinder, the working chamber before 12 being defined in the cylinder 2 between a front face 32 of the piston 3 and the front bottom wall 22 of the cylinder.

Le cylindre 2 est percé, dans chacune des chambres 11 et 12, d'un orifice d'injection et de refoulement, tel que 61, 23, par lequel un fluide sous pression peut être injecté dans cette chambre ou en être éjecté, le piston 3 pouvant ainsi être déplacé dans le cylindre 2 depuis une position de repos qui correspond à un volume minimal de la chambre arrière 11 (figures 1 et 4), jusqu'à une position d'actionnement extrême correspondant à un volume maximal de cette chambre 11 (figures 3 et 6).Cylinder 2 is drilled in each of the chambers 11 and 12, of an injection and delivery orifice, such that 61, 23, by which a pressurized fluid can be injected into or be ejected from this chamber, piston 3 can thus be moved in cylinder 2 from a rest position which corresponds to a minimum volume of the rear chamber 11 (FIGS. 1 and 4), up to a extreme actuation position corresponding to a volume maximum of this chamber 11 (Figures 3 and 6).

Le piston 3 est prolongé par une tige d'actionnement 4, qui est externe à la chambre arrière 11, qui fait saillie hors du cylindre 2 en traversant de façon étanche la paroi de fond avant 22 du cylindre, et qui adopte donc une position imposée par celle du piston.The piston 3 is extended by a rod actuator 4, which is external to the rear chamber 11, which protrudes from cylinder 2 by crossing sealingly the front bottom wall 22 of the cylinder, and which therefore adopts a position imposed by that of the piston.

Le vérin selon l'invention est remarquable en ce qu'il comprend essentiellement un organe de liaison 5 qui, au moins dans les modes de réalisation particuliers illustrés, prend la forme d'une ou plusieurs tiges rigides, et un dispositif de retenue 678, ce dispositif comprenant lui-même un carter 6, des organes de retenue axiale 7, et une navette 8.The jack according to the invention is remarkable in that that it essentially comprises a connecting member 5 which, at least in the particular embodiments illustrated, takes the form of one or more rods rigid, and a retainer 678, this device itself comprising a casing 6, retaining members axial 7, and a shuttle 8.

La ou chaque tige de liaison 5 présente une longueur L inférieure à la longueur L0 du cylindre, est disposée dans le cylindre 2, et relie le piston 3 à la navette 8.The or each connecting rod 5 has a length L less than the length L0 of the cylinder, is disposed in the cylinder 2, and connects the piston 3 to the shuttle 8.

Le vérin de l'invention peut, comme le montrent les figures 1 à 3, soit utiliser plusieurs tiges de liaison 5 montées coulissantes de façon étanche à travers le piston 3 entre des première et seconde butées 91a, 91b, soit, si la tige d'actionnement 4 est creuse, utiliser une seule tige de liaison 5 montée coulissante dans la tige d'actionnement, entre des première et seconde butées 92a, 92b, comme le montrent les figures 4 à 6.The cylinder of the invention can, as shown by Figures 1 to 3, or use several connecting rods 5 sliding climbs tightly across the piston 3 between first and second stops 91a, 91b, either, if the actuating rod 4 is hollow, use a single connecting rod 5 slidably mounted in the actuating rod, between first and second stops 92a, 92b, as shown in Figures 4 to 6.

Le carter 6 est adjacent à la paroi de fond arrière 21 du cylindre, est disposé à l'extérieur de la chambre 11 arrière, et contient les organes de retenue axiale 7.The casing 6 is adjacent to the rear bottom wall 21 of the cylinder, is arranged outside the chamber 11 rear, and contains the axial retaining members 7.

Selon la position du piston 3, la navette 8 se trouve soit dans un état de repos, illustré aux figures 1, 2, 4, et 5, pour lequel elle est logée dans le carter 6, soit dans un état libre, qui est illustré aux figures 3 et 6, et qu'elle atteint en traversant un passage 61 ouvert entre le carter 6 et la chambre de travail arrière 11.Depending on the position of the piston 3, the shuttle 8 is is either in a state of rest, illustrated in the figures 1, 2, 4, and 5, for which it is housed in the housing 6, either in a free state, which is illustrated in the figures 3 and 6, and which it reaches by crossing a passage 61 open between housing 6 and the rear working chamber 11.

Plus précisément, la navette 8 est placée dans son état de repos notamment lorsque le piston 3 est dans sa position de repos, et se trouve déplacée de son état de repos lorsque le piston dépasse une position intermédiaire entre sa position de repos et sa position extrême, cette position intermédiaire étant illustrée aux figures 2 et 5.More specifically, the shuttle 8 is placed in its rest state, in particular when the piston 3 is in its rest position, and is moved from its state of rest when the piston exceeds a position intermediate between its rest position and its position extreme, this intermediate position being illustrated in Figures 2 and 5.

Les organes de retenue axiale 7 ont pour fonction d'exercer sur la navette 8, dans son état de repos (figures 2 et 5), une force de retenue axiale Fx d'amplitude limitée s'opposant à un déplacement de la navette 8 hors de son état de repos. The axial retaining members 7 have the function to exercise on shuttle 8, in its resting state (Figures 2 and 5), an axial retaining force Fx of limited amplitude opposing a displacement of the shuttle 8 out of its resting state.

Pour ce faire, la navette 8 peut comprendre un corps 80 prolongé, vers l'arrière, par une surface inclinée 81 radialement divergente, et les organes de retenue axiale 7 comprennent par exemple des billes 71a, 71b sollicitées par une force élastique radiale centripète Fr et venant en appui sur la surface inclinée 81 pour une position limite de la navette 8 telle qu'illustrée aux figures 2 et 5.To do this, shuttle 8 can include a body 80 extended, backwards, by a surface inclined 81 radially divergent, and the organs of axial retention 7 comprise for example balls 71a, 71b stressed by a radial elastic force centripetal Fr and bearing on the inclined surface 81 for a limit position of shuttle 8 such as illustrated in Figures 2 and 5.

Il est ici essentiel de souligner que l'état de repos de la navette 8 est défini comme un état d'énergie et que la navette peut donc rester dans son état de repos dans plusieurs positions axiales différentes (par exemple illustrées aux figures 1 et 2, 4 et 5), comme c'est le cas lorsque le corps 80 de la navette est cylindrique.It is essential here to emphasize that the state of shuttle 8 rest is defined as an energy state and that the shuttle can therefore remain in its resting state in several different axial positions (for example illustrated in Figures 1 and 2, 4 and 5), as is the case when the body 80 of the shuttle is cylindrical.

L'homme de l'art comprendra ainsi que la position de la navette illustrée aux figures 2 et 5 est une position limite, définie de façon précise par la longueur de la ou des tige(s) de liaison, et se situe à la frontière entre l'état de repos et l'état libre de la navette 8.Those skilled in the art will understand as well as the position of the shuttle illustrated in FIGS. 2 and 5 is a limit position, precisely defined by the length of the connecting rod (s), and is located at the border between the state of rest and the free state of shuttle 8.

Pour pouvoir recevoir et transmettre la force radiale Fr, les billes 71a, 71b peuvent être poussées par une rampe conique 720 définie sur un poussoir cylindrique 72, qui est lui-même sollicité, suivant une direction axiale orientée de l'arrière vers l'avant, par un ressort précontraint 73 prenant appui dans le fond du carter 6.To be able to receive and transmit force radial Fr, the balls 71a, 71b can be pushed by a conical ramp 720 defined on a cylindrical pusher 72, which is itself solicited, following a direction axial oriented from rear to front, by a spring prestressed 73 resting on the bottom of the casing 6.

Les billes 71a, 71b sont par ailleurs maintenues axialement par un appui frontal 62 du carter 6, qui fait office de butée axiale vers l'avant.The balls 71a, 71b are moreover maintained axially by a front support 62 of the casing 6, which makes forward axial stop office.

Comme le montrent les figures, la rampe conique 720 du poussoir 72 s'évase en direction du piston 3, alors que la surface inclinée 81 du corps 8 de la navette, qui est également sensiblement tronconique, s'évase en direction inverse, et converge donc en direction du piston 3.As shown in the figures, the 720 conical ramp pusher 72 flares towards piston 3, then that the inclined surface 81 of the body 8 of the shuttle, which is also substantially frustoconical, flares in reverse direction, and therefore converges towards the piston 3.

Le poussoir 72 forme lui-même piston pour le carter 6, c'est-à-dire qu'il délimite dans ce dernier des chambres auxiliaires arrière et avant 601 et 602, étanches l'une par rapport à l'autre, la chambre auxiliaire avant 602 communiquant avec la chambre de travail arrière 11 à travers le passage 61, et la chambre auxiliaire arrière 601 s'ouvrant de préférence sur l'atmosphère par un perçage 64.The pusher 72 itself forms a piston for the casing 6, that is to say that it delimits therein rear and front auxiliary chambers 601 and 602, waterproof against each other, the chamber auxiliary before 602 communicating with the rear work 11 through passage 61, and the chamber rear auxiliary 601 preferably opening onto the atmosphere by drilling 64.

Par ailleurs, la surface inclinée 81 du corps 8 de navette est terminée par une face transversale arrière 82, contre laquelle est appuyée la partie antérieure cylindrique 740 d'un noyau épaulé 74.Furthermore, the inclined surface 81 of the body 8 of shuttle ends with a rear transverse face 82, against which the front part is supported cylindrical 740 of a shouldered core 74.

Grâce à cet agencement, la partie antérieure 740 du noyau 74 prend la place de la surface inclinée 81 pour maintenir les billes 71a, 71b dans la position radiale qu'elles adoptent lorsque la navette 8 quitte son état de repos, de sorte que les billes 71a, 71b reprennent spontanément leur place sur le corps 80 de la navette 8 lorsque celle-ci retourne dans son état de repos après l'avoir quitté.Thanks to this arrangement, the front part 740 of the core 74 takes the place of the inclined surface 81 for maintain the balls 71a, 71b in the radial position that they adopt when the shuttle 8 leaves its state of rest, so that the balls 71a, 71b resume spontaneously their place on the body 80 of the shuttle 8 when it returns to its resting state after to have left him.

Enfin, comme le montrent les figures, le noyau 74 est de préférence guidé à coulissement à l'intérieur du poussoir 72 et sollicité par un ressort 741 prenant appui dans le fond de ce poussoir 72.Finally, as the figures show, the core 74 is preferably guided sliding inside the pusher 72 and biased by a spring 741 bearing in the bottom of this pusher 72.

Le fonctionnement du vérin de l'invention sera décrit ci-après en référence aux figures 1 à 3.The operation of the jack of the invention will be described below with reference to Figures 1 to 3.

A partir de son état de repos représenté à la figure 1, le vérin peut être actionné par injection d'un fluide sous pression dans la chambre arrière 11, par exemple par injection de ce fluide dans un orifice 63 du carter 6, qui communique avec le passage 61 ouvert entre la chambre arrière 11 et la chambre auxiliaire avant 602 du carter 6, supposée étanche par ailleurs.From its rest state shown in Figure 1, the cylinder can be actuated by injection of a pressurized fluid in the rear chamber 11, by example by injecting this fluid into an orifice 63 of the casing 6, which communicates with passage 61 open between the rear chamber 11 and the front auxiliary chamber 602 of the casing 6, which is otherwise assumed to be tight.

Si la pression P1 du fluide injecté est non nulle mais inférieure à une pression de seuil Pc, le piston 3 et la tige d'actionnement 4 adoptent leur position intermédiaire illustrée à la figure 2, la navette se trouvant alors dans sa position limite, et les tiges de liaison 5 étant en prise avec le piston 3 par les butées 91a.If the pressure P1 of the injected fluid is not zero but less than a threshold pressure Pc, the piston 3 and the actuating rod 4 adopt their position intermediate illustrated in Figure 2, the shuttle is then in its limit position, and the rods of link 5 being engaged with the piston 3 by the stops 91a.

Dans cette configuration, le ressort précontraint 73 exerce sur la navette, par l'intermédiaire de la rampe conique 720 du poussoir 72, une force élastique radiale Fr dont une composante axiale, se développant par application de cette force élastique Fr sur la surface inclinée 81 du corps 80 de la navette, constitue une force Fx de retenue axiale de la navette 8.In this configuration, the prestressed spring 73 exercises on the shuttle, via the ramp conical 720 of pusher 72, a radial elastic force Fr including an axial component, developing by application of this elastic force Fr on the surface inclined 81 of the body 80 of the shuttle, constitutes a shuttle axial force Fx 8.

Si au contraire la pression P1 du fluide injecté atteint la pression de seuil Pc, ce fluide sous pression exerce sur le poussoir 72 une force suffisante pour comprimer le ressort précontraint 73, de sorte que les billes 71a, 71b cessent d'être sollicitées contre la surface inclinée 81 du corps 80 de la navette et que le piston 3 et la tige d'actionnement 4, libérés de la force de retenue axiale Fx, peuvent adopter leur position d'actionnement extrême représentée à la figure 3.If on the contrary the pressure P1 of the injected fluid reaches the threshold pressure Pc, this pressurized fluid exerts on the pusher 72 a force sufficient to compress the prestressed spring 73, so that the balls 71a, 71b cease to be used against the inclined surface 81 of the body 80 of the shuttle and that the piston 3 and actuating rod 4, released from force axial restraint Fx, can adopt their position extreme actuation shown in Figure 3.

Le vérin peut retourner à son état de repos illustré à la figure 2 par injection de fluide sous pression dans l'orifice 23 de la chambre avant 12, le piston 3 venant alors en appui sur les butées 91b pour repousser la navette 8 jusque dans sa position illustrée à la figure 1.The cylinder can return to its resting state illustrated in Figure 2 by injecting fluid under pressure in the orifice 23 of the front chamber 12, the piston 3 then coming to bear on the stops 91b for push the shuttle 8 back to its illustrated position in Figure 1.

Claims (12)

  1. Actuator comprising at least one first working chamber (11) of variable volume delimited by a cylinder (2) of a given length (L0), by a first base wall (21) of the cylinder, and by a first face (31 ) of a piston (3) selectively displaced within the cylinder (2) from a rest position corresponding to a minimum volume of the first chamber (11) into an extreme position by means of a pressurised fluid injected into the first chamber (11), the piston (3) being extended by a control rod (4) external to the first chamber (11) and projecting outside the cylinder (2), characterised in that it comprises a retaining device (678), said device (678) comprising a casing (6) adjacent to the first base wall (21) and external to the first chamber (11), axial retention members (7) housed in the casing (6), and a shuttle member (8) which selectively adopts a resting state in respect of which it is housed in the casing (6) and which selectively leaves its resting state, traversing an open passage (61) between the casing and the first chamber, that it comprises a connector (5) disposed in the cylinder (2) and rigidly joined to the shuttle member (8), of a lesser length (L) than that (L10) of the cylinder and becoming connected at its lower end so as to be fast with the piston (3), the shuttle member being put into its resting state at least whenever the piston (3) is in its rest position, and displaced from its resting state whenever the piston overtakes an intermediate position between its rest position and its extreme position, and further characterised in that the axial retention members (7) exert on the shuttle member (8), in its resting state, an axial retention force (Fx) of a limited amplitude which counters any displacement of the shuttle member (8) outside its resting state.
  2. Actuator according to claim 1, characterised in that it comprises a second working chamber (12) delimited by the cylinder (2), by a second face (32) of the piston (3), and by a second base wall (22) of the cylinder, said second wall being traversed in a sealed manner by the control rod (4).
  3. Actuator according to either of the preceding claims, characterised in that the connector (5) is mounted so as to slide in a sealed manner through the piston (3), between first and second limit stops (91a, 91b).
  4. Actuator according to either of claims 1 and 2, characterised in that the control rod (4) is hollow and that the connector (5) is mounted so as to slide in the control rod between first and second limit stops (92a, 92b).
  5. Actuator according to any of the preceding claims, characterised in that the connector (5) comprises at least one rigid connecting rod.
  6. Actuator according to any of the preceding claims, characterised in that the shuttle member (8) has a substantially cylindrical body (80) and that the axial retention members (7) comprise balls (71a, 71b) placed under load by a radial elastic force (Fr) and selectively bearing against an inclined surface (81) of the shuttle body (80), in respect of a limit position adopted by the shuttle member (8) at least whenever the piston (3) is in its intermediate position.
  7. Actuator according to claim 6, characterised in that the axial retention members (7) comprise a substantially cylindrical thrust member (72) placed axially under load in the casing (6) by a pre-stressed spring (73) in the direction of the piston (3), and presenting a conical ramp (720) which, at least when the shuttle member (8) is in the limit position, is positioned up against the balls (71a, 71b).
  8. Actuator according to claim 7, characterised in that the conical ramp (720) of the thrust member (72) widens out in the direction of the piston (3) and that the inclined surface (81) of the shuttle body (8) is substantially tapered and converges in the direction of the piston (3).
  9. Actuator according to claim 8, characterised in that in the casing (6) the thrust member (72) delimits first and second auxiliary chambers (601, 602), which are sealed with respect to one another and the second of which (602) communicates with the first working chamber (11) across the passage (61), as a result of which the balls (71a, 71b) are no longer placed under load against the inclined surface (81) of the shuttle body (8) by the radial elastic force (Fr) whenever the pressurised fluid injected into the first working chamber (11) exerts on the thrust member (72) a force sufficient to compress the pre-stressed spring (73).
  10. Actuator according to any of claims 6 to 9, characterised in that the inclined surface (81) of the shuttle body (8) terminates transversely in a rear face (82) and that the axial retention members (7) incorporate a collared core (74) which is placed flexibly under load against the rear face (82) of the shuttle body (80) and a substantially cylindrical front portion of which (740) takes the place of the inclined surface (81) so as to keep the balls (71a, 71b) in the radial position adopted by them whenever the shuttle member (8) leaves its resting state.
  11. Actuator according to any of claims 7 to 10, characterised in that the axial retention members (7) incorporate a front support (62) of the casing (6), which serves as an axial limit stop for the balls (71a, 71b).
  12. Actuator according to any of the preceding claims in combination with claims 7 and 10, characterised in that the core (74) is slidably mounted in the thrust member (72) and is guided by it.
EP00403557A 1999-12-23 2000-12-15 Actuator with locked intermediate position Expired - Lifetime EP1111248B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9916384 1999-12-23
FR9916384A FR2802985B1 (en) 1999-12-23 1999-12-23 INTERMEDIATE STOP POINT CYLINDER

Publications (2)

Publication Number Publication Date
EP1111248A1 EP1111248A1 (en) 2001-06-27
EP1111248B1 true EP1111248B1 (en) 2004-05-12

Family

ID=9553752

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Application Number Title Priority Date Filing Date
EP00403557A Expired - Lifetime EP1111248B1 (en) 1999-12-23 2000-12-15 Actuator with locked intermediate position

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EP (1) EP1111248B1 (en)
AT (1) ATE266815T1 (en)
DE (1) DE60010636D1 (en)
FR (1) FR2802985B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10307828A1 (en) 2003-02-24 2004-09-02 Undrau-Anstalt Wall panel prefabricated element as well as system and method for producing the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121874A (en) * 1931-04-09 1938-06-28 Universal Gear Shift Corp Servo-motor
US3614912A (en) * 1969-09-29 1971-10-26 Lionel Pacific Inc Telescoping piston central lock hydraulic actuator
DE2203473C2 (en) * 1972-01-26 1983-07-07 Pneumo Dynamics Corp., Cleveland, Ohio Ram with hollow piston rod - has locking bar turned to engage teeth with those inside rod
DE8812882U1 (en) * 1988-10-13 1989-02-16 Fa. Otto Grasl, 3452 Heiligeneich Pneumatic cylinder with end position locking, especially for operating smoke extraction flaps

Also Published As

Publication number Publication date
EP1111248A1 (en) 2001-06-27
DE60010636D1 (en) 2004-06-17
FR2802985B1 (en) 2002-03-22
ATE266815T1 (en) 2004-05-15
FR2802985A1 (en) 2001-06-29

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