EP1176318A1 - Fluid actuator without friction - Google Patents

Fluid actuator without friction Download PDF

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Publication number
EP1176318A1
EP1176318A1 EP01410094A EP01410094A EP1176318A1 EP 1176318 A1 EP1176318 A1 EP 1176318A1 EP 01410094 A EP01410094 A EP 01410094A EP 01410094 A EP01410094 A EP 01410094A EP 1176318 A1 EP1176318 A1 EP 1176318A1
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EP
European Patent Office
Prior art keywords
piston
cylinder
actuation device
fluid
reaction member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP01410094A
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German (de)
French (fr)
Inventor
Gérard Pernin
Henri Carmona
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Mape SA
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Mape SA
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Filing date
Publication date
Application filed by Mape SA filed Critical Mape SA
Publication of EP1176318A1 publication Critical patent/EP1176318A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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

Definitions

  • the invention relates to a fluidic actuation device comprising a reaction member cooperating with a piston cylinder assembly to obtain a control force or movement without friction.
  • Pneumatic or hydraulic actuators such as cylinders, use air or oil in the pistonable chamber to move a rod actuation connected to a load or a receiver.
  • the piston is usually attached to the actuating rod, and can slide inside the cylinder when the pressure increase inside the pistonable chamber.
  • a joint ring seal is mounted on the piston to prevent air or oil leakage. The displacement of the piston causes friction of the seal in the cylinder.
  • the object of the invention is to provide a fluidic actuation device allowing to create a control force or a movement of displacement without friction.
  • the reaction member is formed by a fixed stop, while the cylinder is movable.
  • the cylinder is fixed, and the reaction member serves as an actuator mobile under the pushing effect of the piston.
  • the piston is formed by a ball spherical whose diameter is less than the internal diameter of the cylinder.
  • the piston spherical in this case cooperates with a plane actuating face of the reaction.
  • the piston can be constituted by a cylindrical section stud.
  • the flat base of the piston then cooperates with a face rounded actuation of the reaction member.
  • the pressurized fluid may be gas, especially air, or a liquid.
  • a fluidic actuator 10 includes a cylinder 12 having an inlet port 14 intended to be connected to a reservoir 16 filled with pressurized fluid.
  • the pressurized fluid can be a gas, in particular air, or a liquid, for example water or oil.
  • Inside cylinder 12 there is a movable piston 18 in the form of a spherical ball, cooperating with a reaction member 20 extending opposite the inlet port 14 through the exhaust port 22 of the cylinder 12.
  • the diameter of the spherical piston 18 is less than the internal diameter of the cylinder 12, so as to provide a radial clearance J between the internal cylindrical face of the cylinder 12 and the ball.
  • the exhaust port 22 is connected to atmospheric pressure, and there has no seal between piston 18 and cylinder 12.
  • the presence of clearance J establishes a permanent fluid flow D between the intake chamber 24 and the exhaust chamber 26, so as to obtain a self-centering effect of the piston 18 relative to the axial direction of cylinder 12.
  • the spherical piston 18 is mechanically separated from the reaction member 20, and the isotropic pressure of the fluid in the intake chamber 24 pushes the piston 18 against a plane actuating face 28 of the reaction member 20, and the maintains balance in the centered position.
  • reaction member 20 is fixed or mobile.
  • the cylinder 12 is mounted mobile, and moves in translation in the direction of the arrow F1 when it comes into engagement against the stop, and under the effect of pressure isotropic fluid in the inlet chamber 24. Displacement of the cylinder 12 is carried out without any friction following the presence of the fluid flow D at through the game J.
  • reaction member 20 serves linear actuator by being moved in the direction of arrow F2 under the effect of the thrust of the piston 18. The displacement of the reaction member 20 takes place also without friction.
  • Figure 2 shows an alternative embodiment of an actuating device 10a fluidic with a piston 18a formed by a cylindrical stud cooperating with a face rounded actuation 28 of the reaction member 20.
  • the base 30 of the piston 18a is planar, and the reaction member 20 can be fixed or mobile as in figure 1.
  • Figures 3 and 4 show a double-acting pneumatic cylinder 34 using two actuating devices 10 fluidic 10 of Figure 1 arranged upside down.
  • the stops of the reaction members 20 are formed by rods fixed cylindrical integral with the chassis 36, and extending axially into the cylinders 20 with a certain clearance to define the exhaust orifices 22.
  • the air is alternately sent through the intake ports 14 in each room intake where the corresponding spherical piston 18 is located.
  • Both cylinders 12 are housed in a movable central part 38, to which is fixed a drive element 40 driven by an alternating rectilinear movement (indicated by arrows F3 and F4), respectively during the alternating pressurization of the two cylinders 12.
  • the leakage rate through the clearances J of the spherical pistons 18 allows movement of the drive element 40 without any friction.
  • FIG. 5 shows a pneumatic lifting device 42 usable on any load transport system, in particular conveyors.
  • the device lift 42 comprises a support plate 44 equipped with a plurality of cylinders 24 with balls 18.
  • the reaction member 20 associated with each ball 18 is formed by the load itself (not shown), which moves on the plate 44 without friction thanks to the self-centering of the balls 18.
  • the pressurized air is permanently admitted into the hollow box 46 of the plate 44 to constitute a fluidized bed under the balls 18.
  • the spindle 48 of a tool holder 49 is centered axially without friction by means of a positioning ring 50 provided with a plurality of cylindrical pistons 18a distributed angularly at regular intervals around the axis of spindle 48.
  • the air is sent according to the arrow F5 on the right side of the pistons 18, while the opposite face cooperates with 52 fixed nipples of the reaction members, which are arranged on a crown support 54 coaxial.
  • Self-centering of the cylindrical pistons 18a on the studs 52 due to the air flow allows the coaxial adjustment of the two crowns 50, 54, causing spindle alignment 48.
  • Figure 8 shows a variant of Figure 7, in which the tool holder 49a uses a ball joint 56 for centering the spindle 48.
  • the pistons 18 are of the ball type, and are centered on the nipples 52 by moving the ball joint to spindle alignment 48.
  • the pistons 18, 18a can be made of plastic or metallic material, and have any shape.

Abstract

The fluid actuator (10) consists of a reaction member (20) co-operating with a piston (18) and cylinder (12) Assembly. The piston is located inside the cylinder between an inlet (14) connected to a fluid reservoir (16) and an outlet (22), and the reaction member is separated mechanically from the piston, which is set with a clearance (J) from the cylinder's inner wall to provide a constant fluid flow between the inlet chamber (24) and outlet (22) ensuring automatic centering of the piston.

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention est relative à un dispositif d'actionnement fluidique comprenant un organe de réaction coopérant avec un ensemble piston cylindre pour obtenir une force de commande ou un mouvement de déplacement sans frottement.The invention relates to a fluidic actuation device comprising a reaction member cooperating with a piston cylinder assembly to obtain a control force or movement without friction.

Etat de la techniqueState of the art

Les actionneurs pneumatiques ou hydrauliques, par exemple les vérins, utilisent de l'air ou de l'huile dans la chambre pistonnable pour déplacer une tige d'actionnement reliée à une charge ou un récepteur. Le piston est généralement fixé à la tige d'actionnement, et peut coulisser à l'intérieur du cylindre lors de l'augmentation de pression à l'intérieur de la chambre pistonnable. Un joint d'étanchéité annulaire est monté sur le piston pour éviter toute fuite d'air ou d'huile. Le déplacement du piston provoque un frottement du joint dans le cylindre. Pneumatic or hydraulic actuators, such as cylinders, use air or oil in the pistonable chamber to move a rod actuation connected to a load or a receiver. The piston is usually attached to the actuating rod, and can slide inside the cylinder when the pressure increase inside the pistonable chamber. A joint ring seal is mounted on the piston to prevent air or oil leakage. The displacement of the piston causes friction of the seal in the cylinder.

Objet de l'inventionSubject of the invention

L'objet de l'invention consiste à réaliser un dispositif d'actionnement fluidique permettant de créer une force de commande ou un mouvement de déplacement sans frottement.The object of the invention is to provide a fluidic actuation device allowing to create a control force or a movement of displacement without friction.

Le dispositif selon l'invention est caractérisé en ce que :

  • le piston est agencé à l'intérieur du cylindre entre un orifice d'admission en liaison avec un réservoir de fluide sous pression, et un orifice d'échappement,
  • l'organe de réaction est désolidarisé mécaniquement du piston,
  • et un jeu est ménagé entre la face interne du cylindre et le piston pour établir un débit de fluide permanent entre la chambre d'admission et l'orifice d'échappement, de manière à provoquer un effet d'autocentrage du piston par rapport à la direction axiale du cylindre.
The device according to the invention is characterized in that:
  • the piston is arranged inside the cylinder between an inlet port in connection with a reservoir of pressurized fluid, and an exhaust port,
  • the reaction member is mechanically detached from the piston,
  • and a clearance is provided between the internal face of the cylinder and the piston to establish a permanent fluid flow between the intake chamber and the exhaust port, so as to cause a self-centering effect of the piston relative to the axial direction of the cylinder.

Selon une caractéristique de l'invention, l'organe de réaction est formé par une butée fixe, alors que le cylindre est mobile.According to a characteristic of the invention, the reaction member is formed by a fixed stop, while the cylinder is movable.

Selon une variante, le cylindre est fixe, et l'organe de réaction sert d'actionneur mobile sous l'effet de poussée du piston.Alternatively, the cylinder is fixed, and the reaction member serves as an actuator mobile under the pushing effect of the piston.

Selon une autre caractéristique de l'invention, le piston est formé par une bille sphérique dont le diamètre est inférieur au diamètre interne du cylindre. Le piston sphérique coopère dans ce cas avec une face d'actionnement plane de l'organe de réaction.According to another characteristic of the invention, the piston is formed by a ball spherical whose diameter is less than the internal diameter of the cylinder. The piston spherical in this case cooperates with a plane actuating face of the reaction.

Selon une autre caractéristique de l'invention, le piston peut être constitué par un plot de section cylindrique. La base plane du piston coopère alors avec une face d'actionnement arrondie de l'organe de réaction. Le fluide pressurisé peut être du gaz, notamment de l'air, ou un liquide.According to another characteristic of the invention, the piston can be constituted by a cylindrical section stud. The flat base of the piston then cooperates with a face rounded actuation of the reaction member. The pressurized fluid may be gas, especially air, or a liquid.

Diverses applications sont possibles, notamment pour la réalisation d'un actionneur sans frottement, ou d'un dispositif de sustentation pour convoyeur. Various applications are possible, in particular for the production of an actuator without friction, or a lifting device for conveyor.

Description sommaire des dessinsBrief description of the drawings

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés, dans lesquels:

  • la figure 1 est vue schématique en perspective partiellement en coupe du dispositif d'actionnement fluidique selon l'invention ;
  • la figure 2 est une vue identique de la figure 1 d'une variante de réalisation ;
  • la figure 3 représente une vue en perspective partiellement en coupe d'un vérin à double effet utilisant une paire de dispositifs d'actionnement fluidique selon la figure 1 ;
  • la figure 4 est une vue en plan du vérin de la figure 3 ;
  • la figure 5 représente une vue en perspective d'un dispositif de sustentation pneumatique utilisable sur tout système de transport de charges, notamment des convoyeurs ;
  • la figure 6 illustre une vue en perspective éclatée d'un porte-outil utilisant le dispositif d'actionnement fluidique de la figure 2 pour le centrage d'une broche,
  • la figure 7 montre une vue en élévation partiellement en coupe du porte-outil de la figure 6, équipé de la broche en position centrée ;
  • la figure 8 est une vue identique de la figure 7 d'une variante de réalisation.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example, and represented in the appended drawings, in which:
  • Figure 1 is a schematic perspective view partially in section of the fluidic actuating device according to the invention;
  • Figure 2 is an identical view to Figure 1 of an alternative embodiment;
  • 3 shows a perspective view partially in section of a double-acting cylinder using a pair of fluid actuating devices according to Figure 1;
  • Figure 4 is a plan view of the jack of Figure 3;
  • FIG. 5 represents a perspective view of a pneumatic lifting device usable on any load transport system, in particular conveyors;
  • FIG. 6 illustrates an exploded perspective view of a tool holder using the fluid actuation device of FIG. 2 for centering a spindle,
  • Figure 7 shows an elevational view partially in section of the tool holder of Figure 6, equipped with the spindle in the centered position;
  • Figure 8 is an identical view to Figure 7 of an alternative embodiment.

Description d'un mode de réalisation préférentielDescription of a preferred embodiment

En référence à la figure 1, un dispositif d'actionnement 10 fluidique comporte un cylindre 12 ayant un orifice d'admission 14 destiné à être relié à un réservoir 16 rempli de fluide sous pression. Le fluide pressurisé peut être un gaz, notamment de l'air, ou un liquide, par exemple de l'eau ou de l'huile. A l'intérieur du cylindre 12 se trouve un piston 18 mobile en forme de bille sphérique, coopérant avec un organe de réaction 20 s'étendant à l'opposé de l'orifice d'admission 14 à travers l'orifice d'échappement 22 du cylindre 12.Referring to Figure 1, a fluidic actuator 10 includes a cylinder 12 having an inlet port 14 intended to be connected to a reservoir 16 filled with pressurized fluid. The pressurized fluid can be a gas, in particular air, or a liquid, for example water or oil. Inside cylinder 12 there is a movable piston 18 in the form of a spherical ball, cooperating with a reaction member 20 extending opposite the inlet port 14 through the exhaust port 22 of the cylinder 12.

Le diamètre du piston 18 sphérique est inférieur au diamètre interne du cylindre 12, de manière à ménager un jeu J radial entre la face cylindrique interne du cylindre 12 et la bille. L'orifice d'échappement 22 est relié à la pression atmosphérique, et il n'y a pas de joint d'étanchéité entre le piston 18 et le cylindre 12. La présence du jeu J permet d'établir un débit de fluide D permanent entre la chambre d'admission 24 et la chambre d'échappement 26, de manière à obtenir un effet d'autocentrage du piston 18 par rapport à la direction axiale du cylindre 12.The diameter of the spherical piston 18 is less than the internal diameter of the cylinder 12, so as to provide a radial clearance J between the internal cylindrical face of the cylinder 12 and the ball. The exhaust port 22 is connected to atmospheric pressure, and there has no seal between piston 18 and cylinder 12. The presence of clearance J establishes a permanent fluid flow D between the intake chamber 24 and the exhaust chamber 26, so as to obtain a self-centering effect of the piston 18 relative to the axial direction of cylinder 12.

Le piston 18 sphérique est désolidarisé mécaniquement de l'organe de réaction 20, et la pression isotropique du fluide dans la chambre d'admission 24 pousse le piston 18 contre une face d'actionnement 28 plane de l'organe de réaction 20, et le maintient en équilibre dans la position centrée.The spherical piston 18 is mechanically separated from the reaction member 20, and the isotropic pressure of the fluid in the intake chamber 24 pushes the piston 18 against a plane actuating face 28 of the reaction member 20, and the maintains balance in the centered position.

Deux cas sont possibles selon que l'organe de réaction 20 est fixe ou mobile.Two cases are possible depending on whether the reaction member 20 is fixed or mobile.

Dans le premier cas où l'organe de réaction 20 est constitué par une butée fixe, le cylindre 12 est monté mobile, et se déplace en translation dans le sens de la flèche F1 lorsqu'il arrive en engagement contre la butée, et sous l'effet de la pression isotropique du fluide dans la chambre d'admission 24. Le déplacement du cylindre 12 s'effectue sans aucun frottement suite à la présence du débit de fluide D à travers le jeu J.In the first case where the reaction member 20 is constituted by a fixed stop, the cylinder 12 is mounted mobile, and moves in translation in the direction of the arrow F1 when it comes into engagement against the stop, and under the effect of pressure isotropic fluid in the inlet chamber 24. Displacement of the cylinder 12 is carried out without any friction following the presence of the fluid flow D at through the game J.

Dans le deuxième cas où le cylindre 12 est fixe, l'organe de réaction 20 sert d'actionneur linéaire en étant déplacé dans le sens de la flèche F2 sous l'effet de la poussée du piston 18. Le déplacement de l'organe de réaction 20 s'opère également sans frottement.In the second case where the cylinder 12 is fixed, the reaction member 20 serves linear actuator by being moved in the direction of arrow F2 under the effect of the thrust of the piston 18. The displacement of the reaction member 20 takes place also without friction.

La figure 2 montre une variante de réalisation d'un dispositif d'actionnement 10a fluidique avec un piston 18a formé par un plot cylindrique coopérant avec une face d'actionnement 28 arrondie de l'organe de réaction 20. Dans ce cas, la base 30 du piston 18a est plane, et l'organe de réaction 20 peut être fixe ou mobile comme dans la figure 1.Figure 2 shows an alternative embodiment of an actuating device 10a fluidic with a piston 18a formed by a cylindrical stud cooperating with a face rounded actuation 28 of the reaction member 20. In this case, the base 30 of the piston 18a is planar, and the reaction member 20 can be fixed or mobile as in figure 1.

Les figures 3 et 4 représentent un vérin 34 pneumatique à double effet utilisant deux dispositifs d'actionnement 10 fluidique 10 de la figure 1 disposés en tête-bêche. Les butées des organes de réaction 20 sont formées par des tiges cylindriques fixes solidaires du châssis 36, et pénétrant axialement dans les cylindres 20 avec un certain jeu pour définir les orifices d'échappement 22. L'air est envoyé alternativement par les orifices d'admission 14 dans chaque chambre d'admission où se trouve le piston 18 sphérique correspondant. Les deux cylindres 12 sont logés dans une pièce centrale 38 mobile, à laquelle est fixé un élément d'entraínement 40 animé d'un mouvement rectiligne alternatif (indiqué par les flèches F3 et F4), respectivement lors de la mise sous pression alternée des deux cylindres 12. Le débit de fuite à travers les jeux J des pistons 18 sphériques permet un déplacement de l'élément d'entraínement 40 sans aucun frottement.Figures 3 and 4 show a double-acting pneumatic cylinder 34 using two actuating devices 10 fluidic 10 of Figure 1 arranged upside down. The stops of the reaction members 20 are formed by rods fixed cylindrical integral with the chassis 36, and extending axially into the cylinders 20 with a certain clearance to define the exhaust orifices 22. The air is alternately sent through the intake ports 14 in each room intake where the corresponding spherical piston 18 is located. Both cylinders 12 are housed in a movable central part 38, to which is fixed a drive element 40 driven by an alternating rectilinear movement (indicated by arrows F3 and F4), respectively during the alternating pressurization of the two cylinders 12. The leakage rate through the clearances J of the spherical pistons 18 allows movement of the drive element 40 without any friction.

La figure 5 montre un dispositif de sustentation 42 pneumatique utilisable sur tout système de transport de charges, notamment des convoyeurs. Le dispositif de sustentation 42 comporte une plaque d'appui 44 équipée d'une pluralité de cylindres 24 à billes 18. L'organe de réaction 20 associé à chaque bille 18 est formé par la charge elle-même (non représentée), laquelle se déplace sur la plaque 44 sans frottement grâce à l'autocentrage des billes 18. L'air pressurisé est admis en permanence dans le caisson 46 creux de la plaque 44 pour constituer un lit fluidisé sous les billes 18.FIG. 5 shows a pneumatic lifting device 42 usable on any load transport system, in particular conveyors. The device lift 42 comprises a support plate 44 equipped with a plurality of cylinders 24 with balls 18. The reaction member 20 associated with each ball 18 is formed by the load itself (not shown), which moves on the plate 44 without friction thanks to the self-centering of the balls 18. The pressurized air is permanently admitted into the hollow box 46 of the plate 44 to constitute a fluidized bed under the balls 18.

En référence aux figures 6 et 7, la broche 48 d'un porte-outil 49 est centrée axialement sans frottement au moyen d'une couronne de positionnement 50 pourvue d'une pluralité de pistons 18a cylindriques répartis angulairement à intervalles réguliers autour de l'axe de la broche 48. L'air est envoyé selon la flèche F5 sur le côté droit des pistons 18, tandis que la face opposée coopère avec des tétons 52 fixes des organes de réaction, lesquels sont agencés sur une couronne support 54 coaxiale. L'autocentrage des pistons 18a cylindriques sur les tétons 52 dû au débit d'air, permet l'ajustage coaxial des deux couronnes 50, 54, provoquant l'alignement de la broche 48.Referring to Figures 6 and 7, the spindle 48 of a tool holder 49 is centered axially without friction by means of a positioning ring 50 provided with a plurality of cylindrical pistons 18a distributed angularly at regular intervals around the axis of spindle 48. The air is sent according to the arrow F5 on the right side of the pistons 18, while the opposite face cooperates with 52 fixed nipples of the reaction members, which are arranged on a crown support 54 coaxial. Self-centering of the cylindrical pistons 18a on the studs 52 due to the air flow, allows the coaxial adjustment of the two crowns 50, 54, causing spindle alignment 48.

La figure 8 montre une variante de la figure 7, dans laquelle le porte-outil 49a utilise une articulation à rotule 56 pour le centrage de la broche 48. Les pistons 18 sont du type à billes, et s'autocentrent sur les tétons 52 en déplaçant la rotule pour l'alignement de la broche 48.Figure 8 shows a variant of Figure 7, in which the tool holder 49a uses a ball joint 56 for centering the spindle 48. The pistons 18 are of the ball type, and are centered on the nipples 52 by moving the ball joint to spindle alignment 48.

Les pistons 18, 18a peuvent être réalisés en matière plastique ou métallique, et avoir des formes quelconques.The pistons 18, 18a can be made of plastic or metallic material, and have any shape.

Claims (10)

Dispositif d'actionnement fluidique comprenant un organe de réaction (20) coopérant avec un ensemble piston (18, 18a) cylindre (12) pour obtenir une force de commande ou un mouvement de déplacement sans frottement,
   caractérisé en ce que : le piston (18, 18a) est agencé à l'intérieur du cylindre (12) entre un orifice d'admission (14) en liaison avec un réservoir (16) de fluide sous pression, et un orifice d'échappement (22), l'organe de réaction (20) est désolidarisé mécaniquement du piston (18, 18a), et un jeu (J) est ménagé entre la face interne du cylindre (12) et le piston (18, 18a) pour établir un débit de fluide (D) permanent entre la chambre d'admission (24) et I' orifice d'échappement (22), de manière à provoquer un effet d'autocentrage du piston (18, 18a) par rapport à la direction axiale du cylindre (12). Fluid actuation device comprising a reaction member (20) cooperating with a piston assembly (18, 18a) cylinder (12) to obtain a control force or a movement of movement without friction,
characterized in that : the piston (18, 18a) is arranged inside the cylinder (12) between an inlet orifice (14) in connection with a reservoir (16) of pressurized fluid, and an exhaust orifice (22), the reaction member (20) is mechanically detached from the piston (18, 18a), and a clearance (J) is provided between the internal face of the cylinder (12) and the piston (18, 18a) to establish a permanent flow of fluid (D) between the inlet chamber (24) and the orifice exhaust (22), so as to cause a self-centering effect of the piston (18, 18a) relative to the axial direction of the cylinder (12). Dispositif d'actionnement fluidique selon la revendication 1, caractérisé en ce que l'organe de réaction (20) est formé par une butée fixe, et le cylindre (12) est mobile.Fluid actuation device according to claim 1, characterized in that the reaction member (20) is formed by a fixed stop, and the cylinder (12) is movable. Dispositif d'actionnement fluidique selon la revendication 1, caractérisé en ce que le cylindre (12) est fixe, et l'organe de réaction (20) sert d'actionneur mobile sous l'effet de poussée du piston (18, 18a).Fluid actuation device according to claim 1, characterized in that the cylinder (12) is fixed, and the reaction member (20) serves as a movable actuator under the pushing effect of the piston (18, 18a). Dispositif d'actionnement fluidique selon l'une des revendications 1 à 3, caractérisé en ce que le piston (18) est formé par une bille sphérique dont le diamètre est inférieur au diamètre interne du cylindre (12). Fluid actuation device according to one of claims 1 to 3, characterized in that the piston (18) is formed by a spherical ball whose diameter is less than the internal diameter of the cylinder (12). Dispositif d'actionnement fluidique selon la revendication 4, caractérisé en ce que le piston (18) sphérique coopère avec une face d'actionnement (28) plane de l'organe de réaction (20).Fluid actuation device according to claim 4, characterized in that the spherical piston (18) cooperates with a planar actuation face (28) of the reaction member (20). Dispositif d'actionnement fluidique selon l'une des revendications 1 à 3, caractérisé en ce que le piston (18a) est constitué par un plot de section cylindrique.Fluid actuation device according to one of claims 1 to 3, characterized in that the piston (18a) consists of a stud of cylindrical section. Dispositif d'actionnement fluidique selon la revendication 6, caractérisé en ce que le piston (18a) comprend une base (30) plane coopérant avec une face d'actionnement (28) arrondie de l'organe de réaction (20).Fluid actuation device according to claim 6, characterized in that the piston (18a) comprises a flat base (30) cooperating with a rounded actuation face (28) of the reaction member (20). Dispositif d'actionnement fluidique selon l'une des revendications 1 à 7, caractérisé en ce que le fluide pressurisé peut être du gaz, notamment de l'air, ou un liquide.Fluid actuation device according to one of claims 1 to 7, characterized in that the pressurized fluid can be gas, in particular air, or a liquid. Actionneur utilisant le dispositif d'actionnement fluidique selon l'une des revendications 1 à 8.Actuator using the fluidic actuation device according to one of claims 1 to 8. Dispositif de sustentation utilisant le dispositif d'actionnement fluidique selon l'une des revendications 1 à 8.Lifting device using the fluidic actuation device according to one of claims 1 to 8.
EP01410094A 2000-07-25 2001-07-24 Fluid actuator without friction Withdrawn EP1176318A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009745A FR2812351B1 (en) 2000-07-25 2000-07-25 FRICTIONLESS FLUIDIC ACTUATOR
FR0009745 2000-07-25

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EP1176318A1 true EP1176318A1 (en) 2002-01-30

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EP01410094A Withdrawn EP1176318A1 (en) 2000-07-25 2001-07-24 Fluid actuator without friction

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EP (1) EP1176318A1 (en)
FR (1) FR2812351B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103527532A (en) * 2013-10-18 2014-01-22 浙江工业大学 Long-distance friction-free constant-force output air floatation device
CN103527561A (en) * 2013-10-18 2014-01-22 浙江工业大学 Friction-free constant force output gas floatation device
CN105290708A (en) * 2015-10-21 2016-02-03 浙江工业大学 Plane rolling cutter providing constant rolling force
WO2023193970A1 (en) * 2022-04-08 2023-10-12 Weber-Hydraulik Gmbh Cylinder/piston assembly with eccentric piston rod

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122045A (en) * 1961-12-22 1964-02-25 Sperry Rand Corp Fluid powered device
GB2079374A (en) * 1980-07-03 1982-01-20 Veeder Root Ltd Fluid actuator
US4594939A (en) * 1981-02-20 1986-06-17 Noord-Nederlandsche Machinefabriek B.V. Method for controlling the gap present between the wall of a cylinder barrel and a ball piston and apparatus embodying the method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122045A (en) * 1961-12-22 1964-02-25 Sperry Rand Corp Fluid powered device
GB2079374A (en) * 1980-07-03 1982-01-20 Veeder Root Ltd Fluid actuator
US4594939A (en) * 1981-02-20 1986-06-17 Noord-Nederlandsche Machinefabriek B.V. Method for controlling the gap present between the wall of a cylinder barrel and a ball piston and apparatus embodying the method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103527532A (en) * 2013-10-18 2014-01-22 浙江工业大学 Long-distance friction-free constant-force output air floatation device
CN103527561A (en) * 2013-10-18 2014-01-22 浙江工业大学 Friction-free constant force output gas floatation device
CN103527561B (en) * 2013-10-18 2015-08-19 浙江工业大学 A kind of without friction constant force output air-floating apparatus
CN103527532B (en) * 2013-10-18 2015-10-28 浙江工业大学 A kind of long distance exports air-floating apparatus without friction constant force
CN105290708A (en) * 2015-10-21 2016-02-03 浙江工业大学 Plane rolling cutter providing constant rolling force
CN105290708B (en) * 2015-10-21 2018-07-06 浙江工业大学 A kind of plane rolling tool for giving constant rolling power
WO2023193970A1 (en) * 2022-04-08 2023-10-12 Weber-Hydraulik Gmbh Cylinder/piston assembly with eccentric piston rod

Also Published As

Publication number Publication date
FR2812351A1 (en) 2002-02-01
FR2812351B1 (en) 2003-02-07

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