EP0270463A1 - Hydraulic or pneumatic actuator of which the movable translation element is prevented from rotation about its longitudinal axis - Google Patents

Hydraulic or pneumatic actuator of which the movable translation element is prevented from rotation about its longitudinal axis Download PDF

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Publication number
EP0270463A1
EP0270463A1 EP87402757A EP87402757A EP0270463A1 EP 0270463 A1 EP0270463 A1 EP 0270463A1 EP 87402757 A EP87402757 A EP 87402757A EP 87402757 A EP87402757 A EP 87402757A EP 0270463 A1 EP0270463 A1 EP 0270463A1
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EP
European Patent Office
Prior art keywords
rod
cylinder
piston
rigid
axis
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Granted
Application number
EP87402757A
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German (de)
French (fr)
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EP0270463B1 (en
Inventor
Etienne Goulot
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Forest-Line SA
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Forest-Line SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston

Definitions

  • Known hydraulic or pneumatic cylinders comprise a control rod which is integral with a piston mounted sliding in a cylinder, the ends of which are fitted with closing elements.
  • the piston separates in the cylinder an annular chamber closed by the closing element, said first element, which is crossed by the rod, from a solid chamber closed by the other closing element, said second element.
  • the movable element in translation constituted by the rod and its piston is free to rotate about its axis.
  • the point of the member to be moved or blocked, on which the thrust of the jack is applied must be centered on the axis of the piston rod. Otherwise, since it can rotate around its geometric axis, the contact of this point with the end of the rod is not established in the same place on each actuation.
  • this end of the rod has an asymmetrical or eccentric tip to escape an obstacle placed on the path or to adapt to a particular shape taken by the organ to be moved or blocked, it is essential the piston rod of the actuating cylinder cannot rotate around its geometric axis.
  • German application number 1,952,677 describes a jack whose control rod carrying the piston is immobilized in rotation about the axis of the cylinder in which this piston is mounted to slide.
  • the control rod delimits an internal conduit in which coaxially extends a rigid bar fixed to the bottom of the cylinder and passing through a ring integral with the rod.
  • the bar has a square section and then comprises four guide surfaces against which the four facets of a square central orifice which the ring delimits are in contact.
  • the present invention aims: on the one hand, to keep a very precise angular setting of the piston during the displacement in axial translation of this piston, - on the other hand, a practically total annihilation of the friction forces normally generated to prevent the piston from turning.
  • the jack comprises the combination of means taught by the aforementioned German application, combination according to which a control rod is guided through a first end element for closing a cylinder and is integral with a piston mounted to slide in this cylinder, the piston separating in said cylinder an annular chamber closed by the first closing element, from a solid chamber closed by a second closing element, which forms a body with a rigid longitudinal element extending in a duct delimited by the rod and opening into the full chamber, the rigid longitudinal element having at least one guide surface parallel to the axis of the rod and cooperating with at least one bearing element carried by said rod and disposed in contact with said surface (s) guide.
  • the guide surface or surfaces of the rigid longitudinal element of the jack aforementioned cooperates with at least one support element of revolution passing through the duct in a direction substantially orthogonal to the axis of the control rod and carried by the latter so as to be in linear contact with the said surface (s).
  • the rigid guide element is a flat bar of substantially rectangular section, the two guide surfaces of which are parallel to one another and cooperate with at least two fixed pins passing through the control rod and brought into contact by the one of their generators with said surfaces.
  • the rigid guide element is a flat bar of substantially rectangular section, the two guide surfaces of which are parallel to each other cooperate with at least two rotating needles, the ends of each needle being mounted rotating in bearings. of the rod and the intermediate part of the needle considered being brought into contact by one of its generatrices with the corresponding guide surface.
  • the jack comprises a cylinder 1, the ends of which are nested with sealing, in a first and a second element 2 and 3 constituted respectively by a thick tubular part and a bottom; the part 2 is connected to the bottom 3 by tie rods 32 extending along the cylinder 1 so that these various components 1 to 3 form a rigid monolithic assembly resistant to any pressure internal.
  • a piston 4 equipped with a gasket 5.
  • the piston 4 is integral with a control rod 6; for this purpose, it has, from a shoulder 7, an extreme centering 8 extended by a thread 9, so that the reamed and tapped piston can be centered and screwed until it abuts against the shoulder, this which ensures precise fixing.
  • the control rod 6 passes through a guide bore 10 that the part 2 delimits and, to ensure the seal, seals 11 are provided.
  • the piston 4 separates in the cylinder 1 an annular chamber 12 closed by the part 2, from a full chamber 13 closed by the bottom 3.
  • open conduits 14 and 15 delimited respectively by the part 2 and the bottom 3, conduits which are selectively connected by a distributor to a source of pressurized hydraulic or pneumatic fluid.
  • the rod 6 moves in the direction of the arrow F, following an actuating stroke or in the opposite direction following an erasing stroke.
  • the movable assembly constituted by the piston 4 and the rod 6 is caused to move in translation and at the same time it is free to rotate around the geometric axis of the cylinder 1.
  • a rigid bar 16 is fixed by one of its ends in the bottom 3, for example by being embedded in a housing 17 and maintained therein by means of a pin 18
  • the bar 16 extends in a blind conduit 19 which delimits the rod 6.
  • the conduit 19 is coaxial and the bar 16 has two parallel flat guide surfaces 20 and 21 extending symmetrically with respect to the axis of conduit 19 and therefore of the rod 6. Furthermore, these two surfaces 20 and 21 cooperate by contact with two pins 22 and 23 engaged forcefully transversely in the end of said rod.
  • a single guide surface for example 20, is sufficient and then cooperates with a transverse support element, 22 consequently.
  • the corresponding transverse support element can be rotatable instead of being fixed and constituted for example by a needle whose ends are fitted in bearings force-fitted into the end of the rod 6.
  • the guide surface or each of the guide surfaces of the element 16 can cooperate with two or more support elements instead of just one.
  • the free end of the rod 6 is adapted to the member to be actuated and its environment.
  • a nozzle 24 equipped with an eccentric pad 25 is mounted and immobilized by any suitable means in this free end of the rod 6.
  • the pad 25 can also be shaped, whether it is eccentric or not, in correspondence with a housing for the member to be actuated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

1. Hydraulic or pneumatic jack of which the element movable in translation is immobilized in rotation about its longitudinal axis, said movable element comprising a control rod (6) which is guided through a first outermost closure element (2) of a cylinder (1) and which is integral with a piston (4) mounted for sliding in said cylinder the piston separating in said cylinder an annular chamber (12) obturated by the first closure element (2), from a filled chamber (13) obturated by a second closure element (3), which element is integral with a rigid longitudinal element (16) which extends into a conduit (19) defined by rod (6) and issues into the filled chamber (13), the rigid longitudinal element (16) having at least one guiding surface (20, 21) parallel to the rod axis and cooperating with at least one support element carried by said rod (6) and arranged so as to be in contact with the guiding surface or surfaces, characterized in that the guiding surface or surfaces (20, 21) of the rigid longitudinal element (16) cooperates with at least one an axi-symmetrical supporting element (22, 23) traversing the conduit (19) in a direction substantially perpendicular to the axis of the control rod (6) and carried by same in such a way as to be in linear contact with said surface or surfaces.

Description

Les vérins hydrauliques ou pneumatiques connus comportent une tige de commande faisant corps avec un piston monté coulissant dans un cylindre dont les extrémités sont équipées d'éléments de fermeture. Le piston sépare dans le cylindre une chambre annulaire obturée par l'élément de fermeture, dit premier élément, qui est traversé par la tige, d'une chambre pleine obturée par l'autre élément de fermeture, dit deuxième élément. L'élément mobile en translation constitué par la tige et son piston est libre de tourner autour de son axe.Known hydraulic or pneumatic cylinders comprise a control rod which is integral with a piston mounted sliding in a cylinder, the ends of which are fitted with closing elements. The piston separates in the cylinder an annular chamber closed by the closing element, said first element, which is crossed by the rod, from a solid chamber closed by the other closing element, said second element. The movable element in translation constituted by the rod and its piston is free to rotate about its axis.

Bien entendu, le point de l'organe à déplacer ou à bloquer, sur lequel la poussée du vérin est appliquée, doit être centré sur l'axe de la tige de piston. Sinon, étant donné que celle-ci peut tourner autour de son axe géométrique, le contact de ce point avec l'extrémité de la tige ne s'établit pas au même endroit à chaque actionnement.Of course, the point of the member to be moved or blocked, on which the thrust of the jack is applied, must be centered on the axis of the piston rod. Otherwise, since it can rotate around its geometric axis, the contact of this point with the end of the rod is not established in the same place on each actuation.

Si cette extrémité de la tige est munie d'un embout de forme dissymétrique ou excentrée pour échapper à un obstacle placé sur le trajet ou pour s'adapter à une prise de forme particulière de l'organe à déplacer ou à bloquer, il est essentiel que la tige de piston du vérin d'actionnement ne puisse pas tourner autour de son axe géométrique.If this end of the rod has an asymmetrical or eccentric tip to escape an obstacle placed on the path or to adapt to a particular shape taken by the organ to be moved or blocked, it is essential the piston rod of the actuating cylinder cannot rotate around its geometric axis.

Or, la demande allemande numéro 1.952.677 décrit un vérin dont la tige de commande portant le piston est immobilisée en rotation autour de l'axe du cylindre dans lequel ce piston est monté coulissant. A cet effet, la tige de commande délimite un conduit interne dans lequel s'étend coaxialement une barre rigide fixée au fond du cylindre et traversant une bague faisant corps avec la tige. La barre présente une section carrée et comporte alors quatre surfaces de guidage contre lesquelles sont en contact les quatre facettes d'un orifice central carré que délimite la bague.However, German application number 1,952,677 describes a jack whose control rod carrying the piston is immobilized in rotation about the axis of the cylinder in which this piston is mounted to slide. To this end, the control rod delimits an internal conduit in which coaxially extends a rigid bar fixed to the bottom of the cylinder and passing through a ring integral with the rod. The bar has a square section and then comprises four guide surfaces against which the four facets of a square central orifice which the ring delimits are in contact.

Il est bien connu qu'il est difficile d'assurer un guidage en translation parfait de la bague le long de la barre lorsque ces organes sont conformés comme indiqué dans ce qui précède. Pour que le fonctionnement du vérin ne soit pas perturbé par des forces de frottement entre la barre et la bague, forces qui peuvent être relativement importantes et surtout inégalement réparties le long de la course axiale du piston, il est généralement nécessaire de prévoir du jeu entre les surfaces de guidage de la barre et les facettes de la bague. Dès lors, ce dispositif empêche bien le piston et sa tige de tourner autour de leur axe, mais leur positionnement angulaire est imprécis puisqu'en raison du jeu précité entre la barre et la bague, le piston ne reste pas fixe dans une position angulaire précise mais peut occuper n'importe quelle position entre deux limites décalées angulairement l'une par rapport à l'autre. Cet inconvénient est particulièrement gênant lorsque l'extrémité de la tige de commande coopère avec un moyen tel, que l'indexage angulaire doit être précis.It is well known that it is difficult to ensure perfect translational guidance of the ring along the bar when these members are shaped as indicated in the foregoing. So that the operation of the cylinder is not disturbed by friction forces between the bar and the ring, forces which can be relatively large and especially unevenly distributed along the axial stroke of the piston, it is generally necessary to provide clearance between the guide surfaces of the bar and the facets of the ring. Consequently, this device does indeed prevent the piston and its rod from rotating around their axis, but their angular positioning is imprecise since, due to the aforementioned clearance between the bar and the ring, the piston does not remain fixed in a precise angular position. but can occupy any position between two limits angularly offset from each other. This drawback is particularly troublesome when the end of the control rod cooperates with means such that the angular indexing must be precise.

La présente invention vise :
    - d'une part, à conserver un calage angulaire très précis du piston lors du déplacement en translation axiale de ce piston,
    - d'autre part, une annihilation pratiquement totale des forces de frottement normalement engendrées pour empêcher le piston de tourner.The present invention aims:
on the one hand, to keep a very precise angular setting of the piston during the displacement in axial translation of this piston,
- on the other hand, a practically total annihilation of the friction forces normally generated to prevent the piston from turning.

Pour atteindre ce but, le vérin comporte la combinaison de moyens enseignée par la demande allemande précitée, combinaison selon laquelle une tige de commande est guidée à travers un premier élément extrême de fermeture d'un cylindre et fait corps avec un piston monté coulissant dans ce cylindre, le piston séparant dans ledit cylindre une chambre annulaire obturée par le premier élément de fermeture, d'une chambre pleine obturée par un deuxième élément de fermeture, lequel fait corps avec un élément longitudinal rigide s'étendant dans un conduit délimité par la tige et débouchant dans la chambre pleine, l'élément longitudinal rigide présentant au moins une surface de guidage parallèle à l'axe de la tige et coopérant avec au moins un élément d'appui porté par ladite tige et disposé au contact de la ou lesdites surfaces de guidage.To achieve this goal, the jack comprises the combination of means taught by the aforementioned German application, combination according to which a control rod is guided through a first end element for closing a cylinder and is integral with a piston mounted to slide in this cylinder, the piston separating in said cylinder an annular chamber closed by the first closing element, from a solid chamber closed by a second closing element, which forms a body with a rigid longitudinal element extending in a duct delimited by the rod and opening into the full chamber, the rigid longitudinal element having at least one guide surface parallel to the axis of the rod and cooperating with at least one bearing element carried by said rod and disposed in contact with said surface (s) guide.

Conformément à l'invention et toujours dans ce but, la ou les surfaces de guidage de l'élément longitudinal rigide du vérin précité coopère avec au moins un élément d'appui de révolution traversant le conduit dans une direction sensiblement orthogonale à l'axe de la tige de commande et porté par celle-ci pour être en contact linéaire avec la ou lesdites surfaces.According to the invention and still for this purpose, the guide surface or surfaces of the rigid longitudinal element of the jack aforementioned cooperates with at least one support element of revolution passing through the duct in a direction substantially orthogonal to the axis of the control rod and carried by the latter so as to be in linear contact with the said surface (s).

Suivant une première forme de réalisation, l'élément rigide de guidage est une barre méplate de section sensiblement rectangulaire, dont les deux surfaces de guidage parallèles entre elles coopèrent avec au moins deux goupilles fixes traversant la tige de commande et mises en contact par l'une de leurs génératrices avec lesdites surfaces.According to a first embodiment, the rigid guide element is a flat bar of substantially rectangular section, the two guide surfaces of which are parallel to one another and cooperate with at least two fixed pins passing through the control rod and brought into contact by the one of their generators with said surfaces.

Suivant une deuxième forme de réalisation, l'élément rigide de guidage est une barre méplate de section sensiblement rectangulaire, dont les deux surfaces de guidage parallèles entre elles coopèrent avec au moins deux aiguilles tournantes, les extrémités de chaque aiguille étant montées tournantes dans des coussinets de la tige et la partie intermédiaire de l'aiguille considérée étant mise en contact par l'une de ses génératrices avec la surface de guidage correspondante.According to a second embodiment, the rigid guide element is a flat bar of substantially rectangular section, the two guide surfaces of which are parallel to each other cooperate with at least two rotating needles, the ends of each needle being mounted rotating in bearings. of the rod and the intermediate part of the needle considered being brought into contact by one of its generatrices with the corresponding guide surface.

Divers autres caractéristiques et avantages de l'inven­tion ressortent d'ailleurs de la description détaillée qui suit.Various other characteristics and advantages of the invention will also emerge from the detailed description which follows.

Une forme de réalisation de l'objet de l'invention est représentée, à titre d'exemple non limitatif, sur le dessin annexé.An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing.

Sur ce dessin :

  • - la figure 1 est une coupe longitudinale montrant le vérin de l'invention lorsque son piston est arrêté entre ses positions extrêmes.
  • - la figure 2 est une coupe transversale prise suivant la ligne II-II de la figure 1.
On this drawing :
  • - Figure 1 is a longitudinal section showing the cylinder of the invention when its piston is stopped between its extreme positions.
  • - Figure 2 is a cross section taken along line II-II of Figure 1.

Ainsi que cela ressort clairement du dessin, le vérin comporte un cylindre 1 dont les extrémités sont emboîtées avec étanchéité, dans un premier et un deuxième éléments 2 et 3 constitués respectivement par une pièce tubulaire épaisse et un fond; la pièce 2 est reliée au fond 3 par des tirants 32 s'étendant le long du cylindre 1 afin que ces divers composants 1 à 3 forment un ensemble monolithique rigide et résistant à toute pression interne.As is clear from the drawing, the jack comprises a cylinder 1, the ends of which are nested with sealing, in a first and a second element 2 and 3 constituted respectively by a thick tubular part and a bottom; the part 2 is connected to the bottom 3 by tie rods 32 extending along the cylinder 1 so that these various components 1 to 3 form a rigid monolithic assembly resistant to any pressure internal.

Dans le cylindre 1 est monté coulissant un piston 4 équipé d'une garniture 5. Le piston 4 fait corps avec une tige de commande 6 ; à cet effet, celle-ci présente, à partir d'un épaule­ment 7, un centrage extrême 8 prolongé par un filetage 9, de façon que le piston alésé et taraudé puisse être centré et vissé jusqu'à buter contre l'épaulement, ce qui assure une fixation précise.In the cylinder 1 is slidably mounted a piston 4 equipped with a gasket 5. The piston 4 is integral with a control rod 6; for this purpose, it has, from a shoulder 7, an extreme centering 8 extended by a thread 9, so that the reamed and tapped piston can be centered and screwed until it abuts against the shoulder, this which ensures precise fixing.

La tige de commande 6 traverse un alésage de guidage 10 que la pièce 2 délimite et, pour assurer l'étanchéité, des joints 11 sont prévus.The control rod 6 passes through a guide bore 10 that the part 2 delimits and, to ensure the seal, seals 11 are provided.

Le piston 4 sépare dans le cylindre 1 une chambre annu­laire 12 obturée par la pièce 2, d'une chambre pleine 13 obturée par le fond 3. Dans ces chambres débouchent des conduits 14 et 15 délimités respectivement par la pièce 2 et le fond 3, conduits qui sont sélectivement raccordés par un distributeur à une source de fluide hydraulique ou pneumatique sous pression. Ainsi, suivant que la chambre 13 ou la chambre 12 est alimentée en fluide sous pression, la tige 6 se déplace dans le sens de la flèche F, suivant une course d'actionnement ou dans le sens opposé suivant une course d'effacement.The piston 4 separates in the cylinder 1 an annular chamber 12 closed by the part 2, from a full chamber 13 closed by the bottom 3. In these chambers open conduits 14 and 15 delimited respectively by the part 2 and the bottom 3, conduits which are selectively connected by a distributor to a source of pressurized hydraulic or pneumatic fluid. Thus, depending on whether the chamber 13 or the chamber 12 is supplied with pressurized fluid, the rod 6 moves in the direction of the arrow F, following an actuating stroke or in the opposite direction following an erasing stroke.

Le vérin étant réalisé comme cela est décrit dans ce qui précède, l'équipage mobile constitué par le piston 4 et la tige 6 est amené à se déplacer en translation et en même temps il est libre de tourner autour de l'axe géométrique du cylindre 1.The cylinder being produced as described above, the movable assembly constituted by the piston 4 and the rod 6 is caused to move in translation and at the same time it is free to rotate around the geometric axis of the cylinder 1.

Si l'on veut s'opposer à ce que cet équipage mobile 4,6 puisse tourner, des moyens particuliers faisant l'objet de la présente invention doivent être mis en oeuvre.If we want to oppose that this moving equipment 4,6 can rotate, particular means forming the subject of the present invention must be implemented.

Suivant la forme de réalisation représentée sur le dessin, une barre rigide 16 est fixée par l'une de ses extrémités dans le fond 3, par exemple en étant encastrée dans un logement 17 et maintenu dans celui-ci au moyen d'une goupille 18. La barre 16 s'étend dans un conduit borgne 19 que délimite la tige 6. Dans cet exemple, le conduit 19 est coaxial et le barreau 16 présente deux surfaces planes parallèles de guidage 20 et 21 s'étendant symétriquement par rapport à l'axe du conduit 19 et donc de la tige 6. Par ailleurs, ces deux surfaces 20 et 21 coopèrent par contact avec deux goupilles 22 et 23 engagées à force transversalement dans l'extrémité de ladite tige.According to the embodiment shown in the drawing, a rigid bar 16 is fixed by one of its ends in the bottom 3, for example by being embedded in a housing 17 and maintained therein by means of a pin 18 The bar 16 extends in a blind conduit 19 which delimits the rod 6. In this example, the conduit 19 is coaxial and the bar 16 has two parallel flat guide surfaces 20 and 21 extending symmetrically with respect to the axis of conduit 19 and therefore of the rod 6. Furthermore, these two surfaces 20 and 21 cooperate by contact with two pins 22 and 23 engaged forcefully transversely in the end of said rod.

Il résulte de ce qui précède que lorsque l'équipage mobile 4, 6 se déplace en translation dans le sens de la flèche F ou dans le sens opposé, les goupilles 22 et 23 glissent contre les surfaces 20 et 21 de la barre 16 qui empèchent ainsi ledit équipage de tourner.It follows from the above that when the moving element 4, 6 moves in translation in the direction of the arrow F or in the opposite direction, the pins 22 and 23 slide against the surfaces 20 and 21 of the bar 16 which prevent thus said crew to turn.

Bien entendu, une seule surface de guidage, 20 par exemple, suffit et coopère alors avec un élément transversal d'appui, 22 par conséquent. Par ailleurs, que l'élément longitudinal rigide 16 comporte une ou deux surfaces de guidage, l'élément transversal d'appui correspondant peut être tournant au lieu d'être fixe et constitué par exemple par une aiguille dont les extrémités sont emboîtées dans des coussinets montés à force dans l'extrémité de la tige 6. D'autre part, la surface de guidage ou chacune des surfaces de guidage de l'élément 16 peut coopérer avec deux ou plusieurs éléments d'appui au lieu d'un seul.Of course, a single guide surface, for example 20, is sufficient and then cooperates with a transverse support element, 22 consequently. Furthermore, as the rigid longitudinal element 16 has one or two guide surfaces, the corresponding transverse support element can be rotatable instead of being fixed and constituted for example by a needle whose ends are fitted in bearings force-fitted into the end of the rod 6. On the other hand, the guide surface or each of the guide surfaces of the element 16 can cooperate with two or more support elements instead of just one.

Les variantes exposées ci-dessus concernent le cas où une seule barre de guidage 16 est prévue. Mais il est bien évident que deux ou plusieurs barres peuvent coopérer avec un ou plusieurs éléments transversaux d'appui disposées entre elles et/ou à l'extérieur.The variants set out above relate to the case where a single guide bar 16 is provided. But it is obvious that two or more bars can cooperate with one or more transverse support elements arranged between them and / or outside.

Quelle que soit la forme de réalisation choisie, l'extrémité libre de la tige 6 est adaptée à l'organe à actionner et son environnement. Dans l'exemple représenté, il s'agit d'appliquer la force en un point excentré par rapport à l'axe longitudinal du vérin. Dans ce cas, un embout 24 équipé d'une pastille excentrée 25 est monté et immobilisé par tout moyen approprié dans cette extrémité libre de la tige 6. La pastille 25 peut aussi être conformée, qu'elle soit excentrée ou non, en correspondance avec un logement de l'organe à actionner.Whatever the embodiment chosen, the free end of the rod 6 is adapted to the member to be actuated and its environment. In the example shown, it is a question of applying the force at a point eccentric with respect to the longitudinal axis of the jack. In this case, a nozzle 24 equipped with an eccentric pad 25 is mounted and immobilized by any suitable means in this free end of the rod 6. The pad 25 can also be shaped, whether it is eccentric or not, in correspondence with a housing for the member to be actuated.

Claims (4)

1.- Vérin hydraulique ou pneumatique dont l'élément mobile en translation est immobilisé en rotation autour de son axe longitudinal, cet élément mobile comportant une tige de commande (6) qui est guidée à travers un premier élément extrême de fermeture (2) d'un cylindre (1) et qui fait corps avec un piston (4) monté coulissant dans ce cylindre, le piston séparant dans ledit cylindre une chambre annulaire (12) obturée par le premier élément de fermeture (2), d'une chambre pleine (13) obturée par un deuxième élément de fermeture (3), lequel fait corps avec un élément longitudinal rigide (16) s'étendant dans un conduit (19) délimité par la tige (6) et débouchant dans la chambre pleine (13), l'élément longitudinal rigide (16) présentant au moins une surface de guidage (20, 21) parallèle à l'axe de la tige et coopérant avec au moins un élément d'appui porté par ladite tige (6) et disposé au contact de la ou lesdites surfaces de guidage,
      caractérisé en ce que la ou les surfaces de guidage (20, 21) de l'élément longitudinal rigide (16) coopère avec au moins un élément d'appui de révolution (22, 23) traversant le conduit (19) dans une direction sensiblement orthogonale à l'axe de la tige de commande (6) et porté par celle-ci pour être en contact linéaire avec la ou lesdites surfaces.1.- Hydraulic or pneumatic cylinder whose movable element in translation is immobilized in rotation about its longitudinal axis, this movable element comprising a control rod (6) which is guided through a first end closure element (2) d '' a cylinder (1) which is integral with a piston (4) slidably mounted in this cylinder, the piston separating in said cylinder an annular chamber (12) closed by the first closing element (2), from a full chamber (13) closed by a second closing element (3), which is integral with a rigid longitudinal element (16) extending in a duct (19) delimited by the rod (6) and opening into the full chamber (13) , the rigid longitudinal element (16) having at least one guide surface (20, 21) parallel to the axis of the rod and cooperating with at least one bearing element carried by said rod (6) and arranged in contact said guide surface (s),
characterized in that the guide surface (s) (20, 21) of the rigid longitudinal element (16) cooperates with at least one support element of revolution (22, 23) passing through the duct (19) in a direction substantially orthogonal to the axis of the control rod (6) and carried by the latter to be in linear contact with the said surface (s). 2.- Vérin selon la revendication 1, caractérisé en ce que l'élément rigide de guidage est une barre méplate (16) de section sensiblement rectangulaire, dont les deux surfaces de guidage (20, 21) parallèles entre elles coopèrent avec au moins deux goupilles fixes (22, 23) traversant la tige de commande (6) et mises en contact par l'une de leurs génératrices avec lesdites surfaces.2. A cylinder according to claim 1, characterized in that the rigid guide element is a flat bar (16) of substantially rectangular section, the two guide surfaces (20, 21) of which are mutually parallel and cooperate with at least two fixed pins (22, 23) passing through the control rod (6) and brought into contact by one of their generatrices with said surfaces. 3.- Vérin selon la revendication 1, caractérisé en ce que l'élément rigide de guidage est une barre méplate (16) de section sensiblement rectangulaire, dont les deux surfaces de guidage (20, 21) parallèles entre elles coopèrent avec au moins deux aiguilles tournantes, les extrémités de chaque aiguille étant montées tournantes dans des coussinets de la tige (6) et la partie intermédiaire de l'aiguille considérée étant mise en contact par l'une de ses génératrices avec la surface de guidage correspondante.3. A cylinder according to claim 1, characterized in that the rigid guide element is a flat bar (16) of substantially rectangular section, the two guide surfaces (20, 21) of which are mutually parallel and cooperate with at least two rotating needles, the ends of each needle being rotatably mounted in rod bearings (6) and the part intermediate of the needle in question being brought into contact by one of its generatrices with the corresponding guide surface. 4.- Vérin selon la revendication 1 ou 2, caractérisé en ce que la tige de commande (6) est munie à son extrémité libre, d'un embout (24, 25) de forme dissymétrique ou excentrée.4. A cylinder according to claim 1 or 2, characterized in that the control rod (6) is provided at its free end, with a tip (24, 25) of asymmetrical or eccentric shape.
EP19870402757 1986-12-05 1987-12-04 Hydraulic or pneumatic actuator of which the movable translation element is prevented from rotation about its longitudinal axis Expired - Lifetime EP0270463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8617089A FR2607877B1 (en) 1986-12-05 1986-12-05 HYDRAULIC OR PNEUMATIC CYLINDER OF WHICH THE MOBILE ELEMENT IN TRANSLATION IS IMMOBILIZED IN ROTATION AROUND ITS LONGITUDINAL AXIS
FR8617089 1986-12-05

Publications (2)

Publication Number Publication Date
EP0270463A1 true EP0270463A1 (en) 1988-06-08
EP0270463B1 EP0270463B1 (en) 1990-01-03

Family

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Application Number Title Priority Date Filing Date
EP19870402757 Expired - Lifetime EP0270463B1 (en) 1986-12-05 1987-12-04 Hydraulic or pneumatic actuator of which the movable translation element is prevented from rotation about its longitudinal axis

Country Status (3)

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EP (1) EP0270463B1 (en)
ES (1) ES2013303B3 (en)
FR (1) FR2607877B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635361A1 (en) * 1988-08-10 1990-02-16 Cit Alcatel Hydraulic jack with linear travel and sliding arm locked in rotation.
GB2274323A (en) * 1993-01-14 1994-07-20 Ian Musson Fluid cylinders
EP0896159A3 (en) * 1997-08-04 2000-09-27 Waircom M.B.S. S.p.A. Pneumatic cylinder with non rotating shaft
FR2820089A1 (en) * 2001-01-26 2002-08-02 Gaussin Sa Wheel for heavy load transport vehicle is mounted on free end of hydraulic actuator rod, installed under vehicle, rod engages rotational locking column in actuator body internal part
CN102927083A (en) * 2012-11-27 2013-02-13 东风汽车有限公司 Cylinder piston stop device
CN104454756A (en) * 2014-09-26 2015-03-25 凌长清 Self-return plunger-type hydraulic cylinder

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2016864A6 (en) * 1968-08-05 1970-05-15 Steelweld Ltd
DE1952677A1 (en) * 1969-10-20 1971-04-29 Buchmann Rudolf Ch Device to prevent uncontrolled rotary movement of pistons and piston rods on hydraulic or pneumatic devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2016864A6 (en) * 1968-08-05 1970-05-15 Steelweld Ltd
DE1952677A1 (en) * 1969-10-20 1971-04-29 Buchmann Rudolf Ch Device to prevent uncontrolled rotary movement of pistons and piston rods on hydraulic or pneumatic devices

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635361A1 (en) * 1988-08-10 1990-02-16 Cit Alcatel Hydraulic jack with linear travel and sliding arm locked in rotation.
GB2274323A (en) * 1993-01-14 1994-07-20 Ian Musson Fluid cylinders
GB2274323B (en) * 1993-01-14 1995-04-05 Ian Musson Fluid cylinders
EP0896159A3 (en) * 1997-08-04 2000-09-27 Waircom M.B.S. S.p.A. Pneumatic cylinder with non rotating shaft
FR2820089A1 (en) * 2001-01-26 2002-08-02 Gaussin Sa Wheel for heavy load transport vehicle is mounted on free end of hydraulic actuator rod, installed under vehicle, rod engages rotational locking column in actuator body internal part
CN102927083A (en) * 2012-11-27 2013-02-13 东风汽车有限公司 Cylinder piston stop device
CN104454756A (en) * 2014-09-26 2015-03-25 凌长清 Self-return plunger-type hydraulic cylinder

Also Published As

Publication number Publication date
FR2607877B1 (en) 1993-02-12
FR2607877A1 (en) 1988-06-10
EP0270463B1 (en) 1990-01-03
ES2013303B3 (en) 1990-05-01

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