EP0034509A1 - Hydraulic operating device - Google Patents

Hydraulic operating device Download PDF

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Publication number
EP0034509A1
EP0034509A1 EP81400025A EP81400025A EP0034509A1 EP 0034509 A1 EP0034509 A1 EP 0034509A1 EP 81400025 A EP81400025 A EP 81400025A EP 81400025 A EP81400025 A EP 81400025A EP 0034509 A1 EP0034509 A1 EP 0034509A1
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EP
European Patent Office
Prior art keywords
jacket
envelope
cylinder
hydraulic control
housing
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.)
Granted
Application number
EP81400025A
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German (de)
French (fr)
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EP0034509B1 (en
Inventor
Gérard Lucien Devaud
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.)
Societe dApplications des Machines Motrices SAMM SA
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Societe dApplications des Machines Motrices SAMM SA
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Publication of EP0034509A1 publication Critical patent/EP0034509A1/en
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Publication of EP0034509B1 publication Critical patent/EP0034509B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/1438—Cylinder to end cap assemblies

Definitions

  • the present invention relates to hydraulic control devices as used, in particular although not exclusively, in a helicopter mast rotor, to ensure the control of the general or collective pitch, of the cyclic pitch, and / or of the lateral pitch or warping of the blades.
  • Such a device comprises, in a known construction a cylinder formed by a cylinder body made of treated light alloy and which is machined so as to delimit a cylindrical chamber with which a piston cooperates, as well as various conduits and passages forming part of the circuit
  • a cylinder body made of treated light alloy and which is machined so as to delimit a cylindrical chamber with which a piston cooperates, as well as various conduits and passages forming part of the circuit
  • In and on this cylinder body are conventionally fixed bearings and end caps or end caps, as well as a hydraulic control unit which is arranged so as to provide a servo-control of the movable element of the device, which in the particular application envisaged above is constituted by the cylinder body itself, the piston rod being kept fixed.
  • the object of this invention is mainly to provide a control device which, while fulfilling the same functions, is of a cost price significantly lower in manufacturing as in maintenance, and also offers a reduced weight.
  • Such a device of the type comprising a jack formed by a cylinder and a piston secured to a rod, and a hydraulic control block whose body is secured to the cylinder is characterized in that the body of the hydraulic control block defines a housing intended to receive the cylinder of the jack and this cylinder is produced in two main parts, an envelope partially received in the aforementioned housing and fixed on the body of the hydraulic control block; and a tubular jacket positioned axially and radially inside the casing and the housing and which cooperates with the piston.
  • the envelope can be produced in such a way that it simultaneously constitutes the actuating member connected to the swash plate forming part of the mechanism for varying the pitch of the blades.
  • a hydraulic control device which can for example be used to vary the pitch of the blades of a helicopter or to control a light aircraft control surface.
  • this device is connected upstream by a linkage to a control member actuated by the pilot and downstream it is connected to the actual pitch variation mechanism, in this case to the lower element of the swash plate (also not It is understood, however, that such a device can have many other different applications offering the same advantages.
  • the input member is therefore here constituted by a lever L and its output member by a "trumpet" T ".
  • the device mainly comprises a cylinder 1 of axis XX with hydraulic control, and a servo-control block 2, the functions of which will be explained with reference to FIG. 3.
  • the lever L is articulated at 3 on a support 4 linked to the block 2.11 is connected by a link 5 to a sliding drawer 6 and can be locked relative to block 2 by a lock 7.
  • the hydraulic servo-control unit comprises a body 8 pierced right through with three lights 8 a , 8 b , 8 c of parallel axes in which the cylinder, the latch 7 and the drawer 6 and its drawer are received respectively
  • This block also has two end faces perpendicular to the axis XX. It is preferably made by spinning a light alloy, the profile obtained then being cut to length and machined. '
  • the cylinder comprises two main parts, an envelope 9 and a jacket 10.
  • the envelope 9 comprises a roughly cylindrical part 11 extended by a part 12 of progressively decreasing section which constitutes the "trumpet" T.
  • This envelope also includes a skirt 13 end fitted with a seal in a portion 14 of larger diameter of the housing 8 a , and an outer flange 15 delimiting an approximately radial face 16 bearing on the adjacent face 17 of the block, and a frustoconical bearing 18 on which engages a bearing of complementary shape 19d'une flange 20-fixing on the block.
  • the type of fixing used appears in Fig.2 and we can see that it is provided three fixing screws 21 equidistant arranged in such a way that the rupture of one of them does not cause the flange to tilt or change the state of the entire device.
  • the envelope also comprises a cylindrical internal surface 22 and a radial shoulder internal 23 allowing positioning and abutment of a first end element or bottom 24 which constitutes on the one hand, a support member for the jacket 10, and on the other hand, a bearing for the piston rod 25.
  • the jacket 10 has an outer diameter slightly smaller than that of the bore 22 of the casing and also slightly smaller than the diameter of the housing 8 has defined in the control block. It thus defines with these two parts an annular chamber 26 which, in the example chosen, is constantly in communication with the chamber 27 of the jack defined between this jacket, the piston, the piston rod and the bottom 24.
  • the device is completed by considering the left part of Fig.l by a second end element 28 mounted with a seal in the housing 8a of the control unit and which serves, on the one hand, as an axial and radial support for the jacket 10 and, on the other hand, a bearing for the rod 25, thus playing a role similar to that filled by the element 24.
  • An end cover constituted here by the support 4 is fixed on the control block and completes the by ensuring the blocking of the element 28.
  • the second chamber of the jack is designated by the reference 29.
  • the piston rod 25 extends in the example chosen on either side of the piston itself 25 2 with which it is made integral by any suitable means and this rod can be constituted by a hollow tube.
  • a distributor e is supplied by a pipe a, with the interposition of a filter b with three spans, which makes it possible to selectively supply two conduits d, e connected respectively to the chambers 27 and 29 of the jack.
  • the conduit d actually opens into the annular chamber 26 connected to the chamber 27.
  • the conduit e passes through the part rear of the bore 8b of the lock 7, the internal end of which acts on a valve f which can open or close the communication between the two conduits d and e.
  • a conduit g brings the fluid under pressure into the front part of the bore 8 b and there is also a path h back to the cover, from the distributor.
  • this jacket in association with the fact that this jacket is subjected to an axial force of prestress in compression, that it can have a relatively small thickness.
  • This jacket does not in fact intervene for the transmission of the forces which is performed in normal operation via the casing and the hydraulic fluid.
  • the latch 7 blocks the lever L relative to the block 2 and the conduits d and e are put in communication. the mobile assembly is then moved at the same time as the lever L and the force is transmitted directly by the block 2 and the casing 9.
  • the separation of functions which is carried out in the construction according to the invention makes it possible to choose for each element an appropriate structure and a particularly inexpensive manufacturing method.
  • This is how the envelope can be obtained by hammering or stamping - spinning if it is made of light alloy, or even by molding and / or winding if it is made of high resistance plastic resin.
  • control unit can be manufactured by spinning an aluminum alloy or molding a high-strength plastic resin, the additional machining operations being much less numerous.
  • This device can therefore have a significantly reduced weight compared to that of 'a device made by traditional methods.

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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

Le corps (8) du bloc de commande hydraulique (2) délimite un logement (8<a>) destiné à recevoir le cylindre du vérin, et ce cylindre est réalisé en deux parties principales : une enveloppe (9) reçue en partie dans le logement précité et fixée sur le corps du bloc de commande hydraulique et une chemise tubulaire (10) positionnée axialement et radialement à l'intérieur de l'enveloppe et du logement et qui coopère avec le piston. Application notamment à la commande du pas d'un hélicoptère ou des gouvernes d'un avion léger.The body (8) of the hydraulic control unit (2) delimits a housing (8 <a>) intended to receive the cylinder of the jack, and this cylinder is produced in two main parts: an envelope (9) partly received in the aforementioned housing and fixed to the body of the hydraulic control unit and a tubular jacket (10) positioned axially and radially inside the casing and the housing and which cooperates with the piston. Application in particular to the control of the pitch of a helicopter or of the control surfaces of a light aircraft.

Description

La présente invention concerne les dispositifs de commande hydraulique tels qu'utilisés,notamment bien que non exclusivement,dans un mat-rotor d'hélicoptère, pour assurer la commande du pas général ou collectif,du pas cyclique,et/ou du pas latéral ou gauchissement des pales.The present invention relates to hydraulic control devices as used, in particular although not exclusively, in a helicopter mast rotor, to ensure the control of the general or collective pitch, of the cyclic pitch, and / or of the lateral pitch or warping of the blades.

Un tel dispositif comprend,dans une construction connue un vérin formé d'un corps de cylindre réalisé en alliage léger traité et qui est usiné de façon à délimiter une chambre cylindrique avec laquelle coopère un piston,ainsi que divers conduits et passages faisant partie du circuit hydraulique.Dans et sur ce corps de cylindre sont fixés de façon classique des paliers et des fonds ou couvercles d'extrémité,ainsi qu'un bloc de commande hydraulique qui est agencé de façon à réaliser une servo-commande de l'élément mobile du dispositif,qui dans l'application particulière envisagée ci-dessus est constitué par le corps de cylindre lui-même,la tige de piston étant maintenue fixe.Such a device comprises, in a known construction a cylinder formed by a cylinder body made of treated light alloy and which is machined so as to delimit a cylindrical chamber with which a piston cooperates, as well as various conduits and passages forming part of the circuit In and on this cylinder body are conventionally fixed bearings and end caps or end caps, as well as a hydraulic control unit which is arranged so as to provide a servo-control of the movable element of the device, which in the particular application envisaged above is constituted by the cylinder body itself, the piston rod being kept fixed.

On connaît également un autre agencement dans lequel le corps de cylindre et le bloc hydraulique sont matricés d'une seule pièce puis usinés comme dans l'exemple précédent.Another arrangement is also known in which the cylinder body and the hydraulic block are stamped in one piece and then machined as in the previous example.

Ces deux constructions sont coûteuses,d'une part,à cause du traitement de surface que doit subir le matériau utilisé pour résister aux frottements,et d'autre part, du procédé de fabrication utilisé,l'usinage du corps de cylindre et du bloc de commande hydraulique constituant une phase délicate compte tenu du nombre et de la précision des opérations.Un autre inconvénient sérieux réside dans le coût de maintenance puisqu'on cas d'usure partielle c'est l'ensemble du corps de cylindre qu'il faut changer.Par ailleurs,un tel corps de cylindre est relativement lourd ce qui offre un inconvénient supplémentaire dans la plupart des applications envisagées.These two constructions are expensive, on the one hand, because of the surface treatment which the material used to undergo friction must undergo, and on the other hand, the manufacturing process used, the machining of the cylinder body and of the block. hydraulic control constituting a delicate phase taking into account the number and the precision of the operations. Another serious disadvantage resides in the cost of maintenance since in case of partial wear it is the whole of the cylinder body which it is necessary In addition, such a cylinder body is relatively heavy, which offers an additional disadvantage. in most of the applications envisaged.

Le but de cette invention est principalement de réaliser un dispositif de commande qui,tout en remplissant les mêmes fonctions, soit d'un prix de revient nettement inférieur à la fabrication comme à la maintenance,et offre également un poids réduit.The object of this invention is mainly to provide a control device which, while fulfilling the same functions, is of a cost price significantly lower in manufacturing as in maintenance, and also offers a reduced weight.

Un tel dispositif du type comprenant un vérin formé d'un cylindre et d'un piston solidaire d'une tige, et un bloc de commande hydraulique dont le corps est solidaire du cylindre est caractérisé en ce que le corps du bloc de commande hydraulique délimite un logement destiné à recevoir le cylindre du vérin et ce cylindre est réalisé en deux parties principales une enveloppe reçue en partie dans le logement précité et fixée sur le corps du bloé de commande hydraulique; et une chemise tubulaire positionnée axialement et radialement à l'intérieur de l'enveloppe et du logement et qui coopère avec le piston.Such a device of the type comprising a jack formed by a cylinder and a piston secured to a rod, and a hydraulic control block whose body is secured to the cylinder is characterized in that the body of the hydraulic control block defines a housing intended to receive the cylinder of the jack and this cylinder is produced in two main parts, an envelope partially received in the aforementioned housing and fixed on the body of the hydraulic control block; and a tubular jacket positioned axially and radially inside the casing and the housing and which cooperates with the piston.

Suivant d'autres caractéristiques :

  • - l'enveloppe et le logement contiennent chacun un élément d'extrémité formant éventuellement palier et qui délimitent avec la chemise et le piston les deux chambres du vérin,la chemise étant emmanchée sur des portées cylindriques de ces deux éléments d'extrémité et étant en appui axial contre deux épaulements radiaux de ces mêmes éléments d'extrémité une force de précontrainte axiale en compression étant exercée sur la chemise lors de la fixation de l'enveloppe sur le corps du bloc de commande hydraulique ;
  • - une chambre annulaire est délimitée entre d'une part,la chemise et d'autre part,l'enveloppe et la paroi adjacente du logement ménagé dans le corps du bloc de commande hydraulique,cet intervalle annulaire servant de canalisation d'alimentation pour l'une des chambres du vérin ;
  • - de préférence,la tige de piston s'étend de part et d'autre du piston et est reçue dans deux paliers délimités par les éléments d'extrémité précités.
According to other characteristics:
  • - The casing and the housing each contain an end element possibly forming a bearing and which delimit with the jacket and the piston the two chambers of the jack, the jacket being fitted on cylindrical surfaces of these two end elements and being in axial support against two radial shoulders of these same end elements an axial prestressing force in compression being exerted on the jacket during the fixing of the casing to the body of the hydraulic control unit;
  • - An annular chamber is delimited between on the one hand, the jacket and on the other hand, the casing and the adjacent wall of the housing formed in the body of the hydraulic control unit, this annular gap serving as a supply line for the one of the bedrooms cylinder;
  • - Preferably, the piston rod extends on either side of the piston and is received in two bearings delimited by the aforementioned end elements.

Dans l'application particulière envisagée en tête du présent mémoire,on peut réaliser l'enveloppe de telle façon qu'elle constitue simultanément l'organe d'actionnement relié au plateau cyclique faisant partie du mécanisme de variation du pas des pales.In the particular application envisaged at the head of this specification, the envelope can be produced in such a way that it simultaneously constitutes the actuating member connected to the swash plate forming part of the mechanism for varying the pitch of the blades.

L'invention va être décrite plus en détail ci-dessous en se référant au dessin annexé donné uniquement à titre d'exemple et dont :

  • - la Fig.l est une vue en partie en coupe et en partie en élévation d'un dispositif réalisé selon l'invention ;
  • - la Fig.2 est une vue en élévation latérale du dispositif à partir de la droite en considérant la Fig.l ;
  • - la Fig.3 est un schéma hydraulique du dispositif.
The invention will be described in more detail below with reference to the appended drawing given solely by way of example and of which:
  • - Fig.l is a view partly in section and partly in elevation of a device produced according to the invention;
  • - Fig.2 is a side elevational view of the device from the right considering Fig.l;
  • - Fig.3 is a hydraulic diagram of the device.

On voit sur la Fig.l un dispositif de commande hydraulique suivant l'invention qui peut par exemple être utilisé pour faire varier le pas des pales d'un hélicoptère ou bien pour commander une gouverne d'avion léger.Dans la première de ces applications ce dispositif est relié en amont par une tringlerie à un organe de commande actionné par le pilote et en aval il est relié au mécanisme proprement dit de variation du pas,en l'occu- rence à l'élément inférieur du plateau cyclique (également non représenté).Il est bien entendu cependant qu'un tel dispositif peut avoir de nombreuses autres applications différentes en offrant les mêmes avantages.We see in Fig.l a hydraulic control device according to the invention which can for example be used to vary the pitch of the blades of a helicopter or to control a light aircraft control surface. In the first of these applications this device is connected upstream by a linkage to a control member actuated by the pilot and downstream it is connected to the actual pitch variation mechanism, in this case to the lower element of the swash plate (also not It is understood, however, that such a device can have many other different applications offering the same advantages.

L'organe d'entrée est donc ici constitué par un levier L et son organe de sortie par une " trom - pette " T ".The input member is therefore here constituted by a lever L and its output member by a "trumpet" T ".

Le dispositif comprend principalement un vérin 1 d'axe X-X à commande hydraulique,et un bloc de servo-commande 2 dont les fonctions seront explicitées à propos de la Fig.3.Le levier L est articulé en 3 sur un support 4 lié au bloc 2.11 est relié par une biellette 5 à un tiroir coulissant 6 et peut être bloqué par rapport au bloc 2 par un verrou 7.The device mainly comprises a cylinder 1 of axis XX with hydraulic control, and a servo-control block 2, the functions of which will be explained with reference to FIG. 3. The lever L is articulated at 3 on a support 4 linked to the block 2.11 is connected by a link 5 to a sliding drawer 6 and can be locked relative to block 2 by a lock 7.

Le bloc de servo-commande hydraulique comprend un corps 8 percé de part en part de trois lumières 8a, 8b, 8c d'axes parallèles dans lesquelles sont-reçus respectivement le vérin,le verrou 7 et le tiroir 6 et sa fourrure.Ce bloc comporte par ailleurs deux faces d'extrémités perpendiculaires à l'axe X-X.Il est de préférence réalisé par filage d'un alliage léger,leprofilé obtenu étant ensuite tronçonné à longueur et usiné.'The hydraulic servo-control unit comprises a body 8 pierced right through with three lights 8 a , 8 b , 8 c of parallel axes in which the cylinder, the latch 7 and the drawer 6 and its drawer are received respectively This block also has two end faces perpendicular to the axis XX. It is preferably made by spinning a light alloy, the profile obtained then being cut to length and machined. '

Le vérin comprend deux pièces principales une enveloppe 9 et une chemise 10.L'enveloppe 9 comporte une partie 11 à peu près cylindrique prolongée par une partie 12 de section progressivement décroissante qui constitue la " trompette " T.Cette enveloppe comprend également une jupe 13 d'extrémité encastrée à joint étanche dans une partie 14 de plus grand diamètre du logement 8a,et une collerette extérieure 15 délimitant une face à peu près radiale 16 d'appui sur la face adjacente 17 du bloc,et une portée tronconique 18 sur laquelle s'engage une portée de forme complémentaire 19d'une bride 20-de fixation sur le bloc.Le,type de fixation utilisé apparaît sur la Fig.2 et l'on peut voir qu'il est prévu trois vis de fixation 21 équidistantes agencées de telle façon que la rupture de l'une d'entre elles n'engendre pas de basculement de la bride ni de modification de l'état de l'ensemble du dispositif.L'enveloppe comporte par ailleurs une surface interne cylindrique 22 et un épaulement radial interne 23 permettant le positionnement et la venue en butée d'un premier élément d'extrémité ou fond 24 qui constitue d'une part,un organe de support pour la chemise 10, et d'autre part,un palier pour la tige de piston 25.The cylinder comprises two main parts, an envelope 9 and a jacket 10. The envelope 9 comprises a roughly cylindrical part 11 extended by a part 12 of progressively decreasing section which constitutes the "trumpet" T. This envelope also includes a skirt 13 end fitted with a seal in a portion 14 of larger diameter of the housing 8 a , and an outer flange 15 delimiting an approximately radial face 16 bearing on the adjacent face 17 of the block, and a frustoconical bearing 18 on which engages a bearing of complementary shape 19d'une flange 20-fixing on the block. The type of fixing used appears in Fig.2 and we can see that it is provided three fixing screws 21 equidistant arranged in such a way that the rupture of one of them does not cause the flange to tilt or change the state of the entire device. The envelope also comprises a cylindrical internal surface 22 and a radial shoulder internal 23 allowing positioning and abutment of a first end element or bottom 24 which constitutes on the one hand, a support member for the jacket 10, and on the other hand, a bearing for the piston rod 25.

La chemise 10 présente un diamètre extérieur légèrement inférieur à celui de l'alésage 22 de l'enveloppe et également légèrement inférieur au diamètre du logement 8a délimité dans le bloc de commande. Elle délimite ainsi avec ces deux pièces une chambre annulaire 26 qui,dans l'exemple choisi,est constamment en communication avec la chambre 27 du vérin délimitée entre cette chemise,le piston,la tige de piston et le fond 24.The jacket 10 has an outer diameter slightly smaller than that of the bore 22 of the casing and also slightly smaller than the diameter of the housing 8 has defined in the control block. It thus defines with these two parts an annular chamber 26 which, in the example chosen, is constantly in communication with the chamber 27 of the jack defined between this jacket, the piston, the piston rod and the bottom 24.

Le dispositif est complété en considérant la partie gauche de la Fig.l par un deuxième élément d'extrémité 28 monté à joint étanche dans le logement 8a du bloc de commande et qui sert,d'une part,de support axial et radial pour la chemise 10 et,d'autre part de palier pour la tige 25,jouant ainsi un rôle analogue à celui rempli par l'élément 24.Un couvercle d'extrémité constitué ici par le support 4 est fixé sur le bloc de commande et complète l'ensemble en assurant le blocage de l'élément 28.La deuxième chambre du vérin est désignée par la référence 29.The device is completed by considering the left part of Fig.l by a second end element 28 mounted with a seal in the housing 8a of the control unit and which serves, on the one hand, as an axial and radial support for the jacket 10 and, on the other hand, a bearing for the rod 25, thus playing a role similar to that filled by the element 24. An end cover constituted here by the support 4 is fixed on the control block and completes the by ensuring the blocking of the element 28. The second chamber of the jack is designated by the reference 29.

La tige de piston 25 s'étend dans l'exemple choisi de part et d'autre du piston proprement dit 252 dont elle est rendue solidaire par tout moyen convenable et cette tige peut être constituée par un tube creux.The piston rod 25 extends in the example chosen on either side of the piston itself 25 2 with which it is made integral by any suitable means and this rod can be constituted by a hollow tube.

La description sommaire du circuit de servo-commande hydraulique est la suivante (Fig.3).A partir d'une source de fluide sous pression non représentée,on alimente par une canalisation a ,avec interposition d'un filtre b ,un distributeur e à trois portées,qui permet d'alimenter sélectivement deux conduits d, e reliés respectivement aux chambres 27 et 29 du vérin.Le conduit d débouche en fait dans la chambre annulaire 26 reliée à la chambre 27.Le conduit e traverse quant à lui la partie arrière de l'alésage 8b du verrou 7 dont l'extrémité interne agit sur un clapet f qui peut ouvrir ou fermer la communication entre les deux conduits d et e .Un conduit g amène le fluide sous pression dans la partie avant de l'alésage 8b et il est également prévu un trajet h de retour à la bâche,à partir du distributeur.The summary description of the hydraulic servo-control circuit is as follows (Fig. 3): From a source of pressurized fluid not shown, a distributor e is supplied by a pipe a, with the interposition of a filter b with three spans, which makes it possible to selectively supply two conduits d, e connected respectively to the chambers 27 and 29 of the jack. The conduit d actually opens into the annular chamber 26 connected to the chamber 27. The conduit e passes through the part rear of the bore 8b of the lock 7, the internal end of which acts on a valve f which can open or close the communication between the two conduits d and e. A conduit g brings the fluid under pressure into the front part of the bore 8 b and there is also a path h back to the cover, from the distributor.

Le fonctionnement de cet ensemble est simple : en utilisation normale tout déplacement parallèle à l'axe X-X imprimé au levier d'actionnement L provoque le dégagement du verrou 7 et la fermeture du clapet f, puis un déplacement du tiroir 6 du distributeur et l'ali- meutation sélective de l'une ou l'autre des deux chambres 27 et 29 du vérin.L'alimentation de l'une ou l'autre de ces deux chambres entraîne un déplacement dans le sens souhaité,de la partie mobile du vérin constituée par l'ensemble du cylindre et du bloc de commande,la tige de piston étant fixe.The operation of this assembly is simple: in normal use any movement parallel to the axis XX printed on the actuating lever L causes the release of the latch 7 and the closure of the valve f, then a displacement of the drawer 6 of the distributor and the selective feeding of one or the other of the two chambers 27 and 29 of the jack. The feeding of one or the other of these two chambers causes the movable part of the jack to move in the desired direction consisting of the entire cylinder and the control unit, the piston rod being fixed.

On remarquera,au plan du fonctionnement hydraulique du dispositif,que l'utilisation de la chambre annulaire 26 comme canalisation d'alimentation de la chambre 27 se traduit par l'établissement d'une pression égale de part et d'autre de la chemise 10 sur la longueur de la chambre 27,supprimant dans cette partie tout effort de pression différentielle sur ladite chemise.Dans la portion restante de cette chemise,correspondant à la longueur de la chambre 29,une différence de pression peut exister mais qui demeure dans des limites raisonnables, par exemple de l'ordre de la moitié de la pression nominale qui peut elle-même par exemple être de 40 à 50 bars.It will be noted, in terms of the hydraulic operation of the device, that the use of the annular chamber 26 as a supply line for the chamber 27 results in the establishment of an equal pressure on either side of the jacket 10 along the length of the chamber 27, eliminating in this part any differential pressure force on said jacket. In the remaining portion of this jacket, corresponding to the length of the chamber 29, a pressure difference may exist but which remains within limits reasonable, for example of the order of half the nominal pressure which can itself for example be 40 to 50 bars.

Il en résulte,en association avec le fait que cette chemise se trouve soumise 'à une force axiale de précontrainte en compression,qu'elle peut présenter une épaisseur relativement faible.Cette chemise n'intervient pas en effet pour la transmission des efforts qui est effectuée en fonctionnement normal par l'intermédiaire de l'enveloppe et du fluide hydraulique.En cas de défaillance du circuit hydraulique,le verrou 7 bloque le levier L par rapport au bloc 2 et les conduits d et e sont mis en communication.L'ensemble mobile est alors déplacé en même temps que le levier L et l'effort est transmis directement par le bloc 2 et l'enveloppe 9.As a result, in association with the fact that this jacket is subjected to an axial force of prestress in compression, that it can have a relatively small thickness. This jacket does not in fact intervene for the transmission of the forces which is performed in normal operation via the casing and the hydraulic fluid. In the event of a failure of the hydraulic circuit, the latch 7 blocks the lever L relative to the block 2 and the conduits d and e are put in communication. the mobile assembly is then moved at the same time as the lever L and the force is transmitted directly by the block 2 and the casing 9.

La séparation des fonctions qui est réalisée dans la construction selon l'invention permet de choisir pour chaque élément une structure appropriée et un mode de fabrication particulièrement peu coûteux.C'est ainsi que l'enveloppe peut être obtenue par martelage ou matriçage - filage si elle est en alliage léger,ou bien encore par moulage et/ou bobinage si elle est en résine plastique haute résistance.Quant à la chemise également en alliage léger elle est simplement constituée par un tube calibré,tronçonné et traité.De même,le bloc de commande peut être fabriqué par filage d'un alliage d'aluminium ou moulage d'une résine plastique à haute résistance,les opérations complémentaires d'usinage étant beaucoup moins nombreuses.Ce dispositif peut ainsi présenter un poids sensiblement réduit par rapport à celui d'un dispositif fabriqué par des méthodes traditionnelles.The separation of functions which is carried out in the construction according to the invention makes it possible to choose for each element an appropriate structure and a particularly inexpensive manufacturing method. This is how the envelope can be obtained by hammering or stamping - spinning if it is made of light alloy, or even by molding and / or winding if it is made of high resistance plastic resin. control unit can be manufactured by spinning an aluminum alloy or molding a high-strength plastic resin, the additional machining operations being much less numerous. This device can therefore have a significantly reduced weight compared to that of 'a device made by traditional methods.

Claims (10)

1 - Dispositif de commande hydraulique du type comprenant un vérin formé d'un cylindre et d'un piston solidaire d'une tige et un bloc de commande hydraulique dont le corps est solidaire du cylindre, caractérisé en ce que le corps (8) du bloc de commande hydraulique (2) délimite un logement (8a) destiné à recevoir le cylindre du vérin,et ce cylindre est réalisé en deux parties principales : une enveloppe (9) reçue en partie dans le logement précité et fixée sur le corps du bloc de commande hydraulique ; et une chemise tubulaire (10) positionnée axialement et radialement à l'intérieur de l'enveloppe et du logement et qui coopère avec le piston.1 - Hydraulic control device of the type comprising a cylinder formed by a cylinder and a piston secured to a rod and a hydraulic control block whose body is secured to the cylinder, characterized in that the body (8) of the hydraulic control unit (2) delimits a housing (8 a ) intended to receive the cylinder of the jack, and this cylinder is produced in two main parts: an envelope (9) partly received in the aforementioned housing and fixed on the body of the hydraulic control block; and a tubular jacket (10) positioned axially and radially inside the casing and the housing and which cooperates with the piston. 2 - Dispositif suivant la revendication l,caractérisé en ce que l'enveloppe (9). et le logement contiennent chacun un élément d'extrémité (24,28) formant éventuellement palier et qui délimitent avec la chemise et le piston les deux chambres (27,29) du vérin,la chemise (10) étant emmanchée sur des portées'eylindriques de ces deux éléments d'extrémité et étant en appui axial contre deux épaulements radiaux de ces mêmes éléments d'extrémité,une force de précontrainte axiale en compression étant exercée sur la chemise lors de la fixation de l'enveloppe sur le corps du bloc de commande hydraulique.2 - Device according to claim l, characterized in that the envelope (9). and the housing each contain an end element (24,28) possibly forming a bearing and which delimit with the jacket and the piston the two chambers (27,29) of the jack, the jacket (10) being fitted on eyelined bearings of these two end elements and being in axial abutment against two radial shoulders of these same end elements, an axial prestressing force in compression being exerted on the jacket during the fixing of the casing to the body of the block of hydraulic control. 3 - Dispositif suivant la revendication l,caractérisé en ce qu'une chambre annulaire (26) est délimitée entre d'une part,la chemise (10) et d'autre part,l'enveloppe (9) et la paroi adjacente du logement (8a) ménagé dans le corps du bloc de commande hydraulique;cet intervalle annulaire servant de canalisation d'alimentation pour l'une (27) des chambres du vérin.3 - Device according to claim l, characterized in that an annular chamber (26) is delimited between on the one hand, the jacket (10) and on the other hand, the envelope (9) and the adjacent wall of the housing (8a) formed in the body of the hydraulic control unit ; this annular interval serving as a supply line for one (27) of the chambers of the jack. 4 - Dispositif suivant la revendication l,caractérisé en ce que le logement (8a) constitue un alésage étagé dont la partie (14) de plus grand diamètre reçoit à joint étanche l'extrémité (13) de l'enveloppe (9).4 - Device according to Claim l, characterized in that the receptacle (8 a) is a stepped bore whose section (14) of larger diameter receives seal the end (13) of the envelope (9). 5 - Dispositif suivant la revendication l,caractérisé en ce que l'enveloppe (9) comporte une collerette extérieure délimitant une face à peu près radiale (16) d'appui sur la face adjacente (17) du bloc,et une portée tronconique (18) sur laquelle s'engage une portée de forme complémentaire (19) d'une bride (20) de fixation sur le bloc.5 - Device according to claim l, characterized in that the envelope (9) comprises an outer collar delimiting an approximately radial face (16) bearing on the adjacent face (17) of the block, and a frustoconical bearing ( 18) on which engages a bearing of complementary shape (19) with a flange (20) for fixing to the block. 6 - Dispositif suivant la revendication 5,caractérisé en ce que l'enveloppe (9) est fixée en trois points sur le bloc de commande(2).6 - Device according to claim 5, characterized in that the casing (9) is fixed at three points on the control unit (2). 7 - Dispositif suivant la revendication l,caractérisé en ce que la chemise est constituée par un simple tube cylindrique.7 - Device according to claim l, characterized in that the jacket is constituted by a simple cylindrical tube. 8 - Dispositif suivant la revendication 1, caractérisé en ce que le corps (2) du bloc de servo-commande comporte trois lumières (8a, 8b, 8c) parallèles entre elles et qui le traversent de part en part et sont réalisées lors de l'opération initiale de fabrication de ce corps.8 - Device according to Claim 1, characterized in that the body (2) of the servo control block comprises three slots (8 a, 8 b, 8 c) parallel to one another and extending from through the through and are carried during the initial operation of manufacturing this body. 9 - Dispositif suivant la revendication l,caractérisé en ce qu'il est complété par un couvercle d'extrémité (4) fixé sur la face d'extrémité du corps opposée à celle qui reçoit l'enveloppe du vérin.9 - Device according to claim l, characterized in that it is completed by an end cover (4) fixed on the end face of the body opposite to that which receives the casing of the jack. 10 - Dispositif suivant l'une quelconque des revendications 1 à 9,caractérisé en ce que l'enveloppe (9) constitue simultanément l'organe de liaison (Trompette T) relié au mécanisme commandé.10 - Device according to any one of claims 1 to 9, characterized in that the envelope (9) simultaneously constitutes the connecting member (Trumpet T) connected to the controlled mechanism.
EP81400025A 1980-01-25 1981-01-09 Hydraulic operating device Expired EP0034509B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8001592A FR2474613A1 (en) 1980-01-25 1980-01-25 PERFECTED HYDRAULIC CONTROL DEVICE
FR8001592 1980-01-25

Publications (2)

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EP0034509A1 true EP0034509A1 (en) 1981-08-26
EP0034509B1 EP0034509B1 (en) 1985-05-02

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EP81400025A Expired EP0034509B1 (en) 1980-01-25 1981-01-09 Hydraulic operating device

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US (1) US4414881A (en)
EP (1) EP0034509B1 (en)
DE (1) DE3170219D1 (en)
FR (1) FR2474613A1 (en)

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WO1986002054A1 (en) * 1984-10-03 1986-04-10 FUSSEDER, Günther Servo-steering motor

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US4785721A (en) * 1986-07-15 1988-11-22 Leigh Monstevens Keith V Hydraulic cylinder annular insert for retainer member
JPS6315306U (en) * 1986-07-16 1988-02-01
US5117741A (en) * 1990-01-16 1992-06-02 Sta-Rite Industries, Inc. Double wall hydraulic cylinder
DE4128959A1 (en) * 1991-08-30 1993-03-04 Schaeff Karl Gmbh & Co SHOVEL LOADER TILT CYLINDER
FR2684953B1 (en) * 1991-12-11 1994-04-01 Aerospatiale Ste Nationale Indle REDUCED VULNERABILITY DEVICE FOR CONTROLLING A HELICOPTER ROTOR BY CYCLIC PLATFORMS.
AT409788B (en) 2000-07-26 2002-11-25 Hoerbiger Micro Fluid Gmbh CENTRAL PRESSURE CYLINDER

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WO1986002054A1 (en) * 1984-10-03 1986-04-10 FUSSEDER, Günther Servo-steering motor

Also Published As

Publication number Publication date
EP0034509B1 (en) 1985-05-02
US4414881A (en) 1983-11-15
DE3170219D1 (en) 1985-06-05
FR2474613A1 (en) 1981-07-31
FR2474613B1 (en) 1983-11-18

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