EP0006045B1 - Control device for an hydraulic circuit and hydraulic motor unit incorporating such a circuit - Google Patents

Control device for an hydraulic circuit and hydraulic motor unit incorporating such a circuit Download PDF

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Publication number
EP0006045B1
EP0006045B1 EP79400311A EP79400311A EP0006045B1 EP 0006045 B1 EP0006045 B1 EP 0006045B1 EP 79400311 A EP79400311 A EP 79400311A EP 79400311 A EP79400311 A EP 79400311A EP 0006045 B1 EP0006045 B1 EP 0006045B1
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EP
European Patent Office
Prior art keywords
cylinder structure
base
pump
stage
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79400311A
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German (de)
French (fr)
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EP0006045A1 (en
Inventor
Jacques Benilan
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.)
Les Applications Hydrauliques R Sarrazin Sa Dite Ste
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Les Applications Hydrauliques R Sarrazin Sa Dite Ste
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Priority to AT79400311T priority Critical patent/ATE388T1/en
Publication of EP0006045A1 publication Critical patent/EP0006045A1/en
Application granted granted Critical
Publication of EP0006045B1 publication Critical patent/EP0006045B1/en
Expired 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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
    • F15B15/18—Combined units comprising both motor and pump
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2544—Supply and exhaust type
    • Y10T137/2554—Reversing or 4-way valve systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2617—Bypass or relief valve biased open
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2635—Pilot valve operated

Definitions

  • the present invention relates to fluid control devices and in particular those used to carry out the control of so-called “autonomous" jacks, that is to say double acting linear jacks equipped with their own pumping group constituted by a motor and a pump.
  • such equipment comprises, in addition to the motor and the pump, a control unit which is housed in a tank and whose access is therefore difficult, which in particular does not allow adjustments to be made. when the device is in use.
  • certain components are presented independently, in the form of “cartridges and are incorporated into the circuit while being accessible from the outside. These are, however, components which generally fulfill only one function so that, whatever the configuration, the result is a unit which is bulky and of a relatively high cost price.
  • a piloted balancing valve and a non-return valve are combined in the same sub-assembly in a single body.
  • a balancing valve offers well-known drawbacks, and in particular of not allowing speed adjustment, there is no such sub-assembly in the function of controlling the nominal pressure in the circuit.
  • US-A-2 449 482 (Hufferd) describes an autonomous cylinder whose incorporated control device comprises two adjacent assemblies, which operate in combination and which do not allow braking on the fluid return circuit.
  • an indirect control is carried out, from one control assembly to another, which is not very efficient and complicated.
  • the object of this invention is therefore to provide a control device for a fluid circuit, which fulfills several functions, which is compact, economical and allows cartridge mounting. In addition, such a device must be able to easily make the necessary adjustments.
  • the subject of the invention is a control device for a fluid circuit, comprising a body delimiting a housing which passes right through it and in which two subassemblies are arranged coaxially, one of which constitutes a check valve. restraint and braking of a fluid flow, characterized in that the two sub-assemblies respectively constitute a first pressure limiting stage and a second stage forming a check and braking valve and a piloting device is provided arranged in said housing between the pressure limiter stage and the stage forming a check and braking valve, this device acting on the valve shutter and being subjected to the pressure established by the limiter.
  • such a device is associated with a jack, the chamber delimited between the pressure limiting stage and the pilot piston being connected to a source of pressurized fluid and to a first working chamber of this jack, a second of which chamber is connected to the second retaining and braking stage.
  • the invention also relates to an autonomous cylinder comprising a motor, a body forming a reservoir for the fluid, a pump driven by the motor and associated with a control device, and a base on which is fixed a set of cylinder and rod.
  • cylinder characterized in that it comprises two integrated control devices as defined above, incorporated in the base and suitably connected, on the one hand, to the pump and, on the other hand, to the two cylinder working chambers.
  • the pressure relief stage comprises a first insert 10, fixed in the body by screwing, which is hollowed out and has a bottom 11 and a side wall 12.
  • a shutter 14 which, in the example chosen, has a conical shape.
  • This shutter is held in the closed position by a spring 15 bearing against the bottom 16 of a part 17 which is itself screwed in an adjustable manner in the first insert 10.
  • This screw 17 also comprises a skirt 18 received with a tight seal in the insert 10. At its upper part, the latter is closed by a plug 19. It also has a circumferential groove 20 communicating by one or more passages 21 with its internal recess and with a conduit 5 for covering, pierced in the body 1. Seals 22, 23 are provided between this insert and the adjacent wall of the body.
  • the body 1 receives seal around sealing a second insert 30 which may simply be held by the part 10 in abutment against a radial shoulder 8 of the body 3 or may be screwed into the body.
  • This second part is also hollowed out and has a bottom 31 and a side wall 32 which guides a piston 33, the bottom of which directly faces the bottom 11 of the part 10.
  • the latter comprises on its outer face a crosspiece 24 or any other equivalent means. This interval constitutes a chamber 25.
  • the bottom of the second insert is pierced with an orifice 34 and constitutes a seat for a ball 40 of a check valve.
  • the orifice 34 also allows the passage of a pusher 35 integral with the piston 33 or bearing against the bottom of the latter is urged upward looking towards the drawing by a spring 36 itself bearing against the bottom 31 of the part 30.
  • the internal volume of the latter communicates with the volume delimited by the adjacent part of the body by at least one orifice 37.
  • This part of the body is also also connected to the cover by a conduit 6.
  • the end of the pusher 35 adjacent to the check valve 40 has a profile of variable section so as to be able to delimit with the bottom of the part 30 a passage whose free section varies as a function of the axial position of the pusher; the latter may for this purpose have any suitable shape and comprise for example oblique slots 38.
  • a lining 39 is also provided between the bottom 31 and a radial shoulder 3 b of the body 1.
  • the body delimits a stepped bore of smaller section comprising in an intermediate part a radial shoulder 4a on which is supported a spring 41 which acts on the ball 40 to apply it against its seat.
  • the chamber delimited by the body between this shoulder and the second insert is connected to a conduit 7 for the return of fluid.
  • an abutment finger 42 which determines the displacement stroke of the check valve 40 under the action of the pusher 35, the position of this abutment being determined by an adjustment screw 43 comprising a seal. sealing 44.
  • the lower part (in the drawing) of the bore formed in the body is also closed by a tight plug 45.
  • the chamber 25 is connected by a conduit 8, on the one hand, to a source of pressurized fluid (pump 50 in FIG. 2) and, on the other hand, by means of a non-return valve 51 to a working chamber 52 of a jack 53.
  • the duct 7 is assumed to be connected to the second chamber 54 of the jack and therefore receives fluid from this second chamber.
  • the conduits 5 and 6 as well as a pump suction conduit 55, associated with two non-return valves 56, 57 are connected to a fluid reservoir 58.
  • the pump 50 is in two directions of rotation and it is understood that the diagram can be completed to achieve a double-acting control of the jack 53, by a second circuit equivalent to that shown and ensuring the supply of the chamber 54 (from the conduit 59) and the braking of the fluid coming from the chamber 52.
  • the part 30 being blocked in the body 1, and the spider 24 or equivalent means having a radial size such that it does not interfere with this part 30, it is possible, by screwing the part 10 into the body, positively hold the ball 40 away from its seat, which can be particularly advantageous for example to obtain free movement of the associated jack.
  • FIG. 3 There is shown schematically in FIG. 3 a so-called autonomous cylinder, that is to say comprising a motor and a pump incorporated, comprising two control devices according to the invention arranged in the same body which is here constituted by a base 100. These two devices are designated by the references 101 and 102 and one sees on the drawing only the plugs which correspond to the plug 19 in FIG. 1.
  • this base are also provided two housings 103, 104 for pins of axis Y-Y perpendicular to the axis Z-Z of the jack.
  • the latter comprises an electric motor 105, a pump 106 associated with a block of valves 107 which corresponds to the valves 56, 57 in FIG. 2.
  • This pump is surrounded by a cylindrical body 108 and the assembly of the motor, the pump and the body 108 is fixed to the base 10G by means of tie rods 109 or other equivalent fixing members.
  • a drive link is also provided between the output shaft 110 of the motor and the pump.
  • a cylinder assembly proper consisting of a cylinder 111 in which is received a piston 112 secured to a rod 113, the piston and the cylinder defining two chambers 114 and 115.
  • the cylinder 111 is received in a bore 116 of an axial extension 117 of the base. It is also received in a bore 118 of a flange 119 which carries a ring 120 for guiding the rod 113.
  • This assembly is completed by a cylindrical body 121 which is made integral, on the one hand, with the extension 117 of the base and, on the other hand, the flange 119 by means of two elastic rods 122, 123 received in the circumferential grooves of these different parts.
  • the suction of the pump takes place in the part of the reservoir delimited by the body 108, for example, by conduits 127, 128 converging at a point 129 which is as close as possible to the point of intersection between the two axes YY and ZZ.
  • This ensures good circulation of the fluid, improving its cooling, and a correct supply of the pump whatever the variations in position of the jack, thus making the presence of compensators unnecessary in the majority of cases.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Braking Arrangements (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Regulating Braking Force (AREA)

Abstract

The device comprises in a body a pressure limiting stage, a second stage constituting a fluid check and retarding valve and piloting means between these two stages. The second stage comprises regulating means which are easily accessible from outside the body. The device is particularly compact and is of high interest, for example when it is incorporated in a self-contained cylinder structure.

Description

La présente invention concerne les dispositifs de commande à fluide et notamment ceux utilisés pour réaliser la commande de vérins dits « autonomes », c'est-à-dire de vérins linéaires à double effet équipés de leur propre groupe de pompage constitué par un moteur et une pompe.The present invention relates to fluid control devices and in particular those used to carry out the control of so-called "autonomous" jacks, that is to say double acting linear jacks equipped with their own pumping group constituted by a motor and a pump.

D'une façon générale, de tels équipements comportent en plus du moteur et de la pompe un bloc de commande qui est logé dans un réservoir et dont l'accès est de ce fait difficile, ce qui ne permet pas en particulier de réaliser des réglages lorsque l'appareil est en cours d'utilisation. Dans d'autres réalisations, certains composants sont présentés de façon indépendante, sous forme de « cartouches et sont incorporés au circuit tout en étant accessibles de l'extérieur. Il s'agit là cependant de composants ne remplissant en général qu'une seule fonction de sorte que quelle que soit la configuration on aboutit à un ensemble qui est encombrant et d'un prix de revient relativement élevé.In general, such equipment comprises, in addition to the motor and the pump, a control unit which is housed in a tank and whose access is therefore difficult, which in particular does not allow adjustments to be made. when the device is in use. In other embodiments, certain components are presented independently, in the form of “cartridges and are incorporated into the circuit while being accessible from the outside. These are, however, components which generally fulfill only one function so that, whatever the configuration, the result is a unit which is bulky and of a relatively high cost price.

On connaît également (DE-A-2 445 699-Meier-) un agencement de clapet anti-retour et de freinage du débit, dont l'ouverture est commandée par une tige et un piston soumis à une pression de pilotage. Cependant cet agencement n'assure pas le réglage de la pression nominale dans le circuit et il est nécessaire pour remplir cette fonction de prévoir des moyens supplémentaires, ainsi d'ailleurs qu'un trajet pour la pression de pilotage.There is also known (DE-A-2 445 699-Meier-) an arrangement of check valve and flow braking, the opening of which is controlled by a rod and a piston subjected to piloting pressure. However, this arrangement does not ensure the adjustment of the nominal pressure in the circuit and it is necessary to fulfill this function to provide additional means, as well as a path for the pilot pressure.

Dans un autre dispositif connu (DE-A-2 559 029-Heilmeier), on combine dans un même sous-ensemble qu'on dispose coaxialement dans un même corps une vanne d'équilibrage pilotée et un clapet anti-retour mais, outre qu'une telle vanne d'équilibrage offre des inconvénients bien connus, et en particulier de ne pas autoriser un réglage des vitesses, on ne trouve pas dans un tel sous-ensemble la fonction de contrôle de la pression nominale dans le circuit.In another known device (DE-A-2 559 029-Heilmeier), a piloted balancing valve and a non-return valve are combined in the same sub-assembly in a single body. 'such a balancing valve offers well-known drawbacks, and in particular of not allowing speed adjustment, there is no such sub-assembly in the function of controlling the nominal pressure in the circuit.

Enfin le brevet US-A-2 449 482 (Hufferd) décrit un vérin autonome dont le dispositif de commande incorporé comprend deux ensembles adjacents, qui fonctionnent en combinaison et qui ne permettent pas de réaliser un freinage sur le circuit de retour du fluide. De plus, dans cet agencement connu, on effectue un pilotage indirect, d'un ensemble de commande à l'autre, ce qui est peu efficace et compliqué.Finally, US-A-2 449 482 (Hufferd) describes an autonomous cylinder whose incorporated control device comprises two adjacent assemblies, which operate in combination and which do not allow braking on the fluid return circuit. In addition, in this known arrangement, an indirect control is carried out, from one control assembly to another, which is not very efficient and complicated.

Le but de cette invention est par conséquent de fournir un dispositif de commande pour circuit de fluide, qui remplisse plusieurs fonctions, qui soit peu encombrant, économique et permette un montage en cartouche. De plus, un tel dispositif doit pouvoir permettre d'effectuer aisément les réglages nécessaires.The object of this invention is therefore to provide a control device for a fluid circuit, which fulfills several functions, which is compact, economical and allows cartridge mounting. In addition, such a device must be able to easily make the necessary adjustments.

A cet effet, l'invention a pour objet un dispositif de commande pour circuit de fluide, comprenant un corps délimitant un logement qui le traverse de part en part et dans lequel sont disposés coaxialement deux sous-ensembles dont l'un constitue un clapet de retenue et de freinage d'un écoulement de fluide, caractérisé en ce que les deux sous-ensembles constituent respectivement un premier étage limiteur de pression et un deuxième étage formant clapet de retenue et de freinage et il est prévu un dispositif de pilotage disposé dans ledit logement entre l'étage limiteur de pression et l'étage formant clapet de retenue et de freinage, ce dispositif agissant sur l'obturateur du clapet et étant soumis à la pression établie par le limiteur.To this end, the subject of the invention is a control device for a fluid circuit, comprising a body delimiting a housing which passes right through it and in which two subassemblies are arranged coaxially, one of which constitutes a check valve. restraint and braking of a fluid flow, characterized in that the two sub-assemblies respectively constitute a first pressure limiting stage and a second stage forming a check and braking valve and a piloting device is provided arranged in said housing between the pressure limiter stage and the stage forming a check and braking valve, this device acting on the valve shutter and being subjected to the pressure established by the limiter.

Suivant d'autres caractéristiques :

  • - le logement délimité dans le corps comporte une première partie dans laquelle est fixée une première pièce rapportée délimitant un siège pour un obturateur, cette pièce rapportée étant évidée de façon à recevoir l'obturateur, un ressort de tarage et un organe délimitant une face d'appui pour ce ressort, le volume interne de cette pièce rapportée communiquant avec une chambre du corps qui est mise à la bâche, des moyens étant prévus pour régler la position de l'organe délimitant la face d'appui pour le ressort.
  • - le logement délimité dans le corps comporte une deuxième partie pour une deuxième pièce rapportée qui délimite une surface de guidage pour un piston de pilotage, une surface d'appui pour un ressort de rappel de ce piston et un siège pour l'obturateur du clapet de retenue ;
  • - le fond du piston de pilotage fait directement face au fond de la première pièce rapportée et il est prévu des moyens pour maintenir ce piston espacé de la première pièce rapportée.
According to other characteristics:
  • - The housing defined in the body comprises a first part in which is fixed a first insert defining a seat for a shutter, this insert being hollowed out so as to receive the shutter, a setting spring and a member defining a face d 'support for this spring, the internal volume of this insert communicating with a chamber of the body which is put on the cover, means being provided for adjusting the position of the member delimiting the support face for the spring.
  • - the housing defined in the body comprises a second part for a second insert which defines a guide surface for a pilot piston, a bearing surface for a return spring of this piston and a seat for the valve shutter restraint;
  • - The bottom of the pilot piston directly faces the bottom of the first insert and means are provided to keep this piston spaced from the first insert.

Dans une application particulière un tel dispositif est associé à un vérin, la chambre délimitée entre l'étage limiteur de pression et le piston de pilotage étant reliée à une source de fluide sous pression et à une première chambre de travail de ce vérin dont une deuxième chambre est reliée au deuxième étage de retenue et de freinage.In a particular application, such a device is associated with a jack, the chamber delimited between the pressure limiting stage and the pilot piston being connected to a source of pressurized fluid and to a first working chamber of this jack, a second of which chamber is connected to the second retaining and braking stage.

L'invention a également pour objet un vérin autonome comprenant un moteur, un corps formant réservoir pour le fluide, une pompe entraînée par le moteur et associée à un dispositif de commande, et une embase sur laquelle est fixé un ensemble de cylindre et de tige de vérin, caractérisé en ce qu'il comporte deux dispositifs de commande intégrés tels que définis ci-dessus, incorporés à l'ambase et reliés de façon convenable, d'une part, à la pompe et, d'autre part, aux deux chambres de travail du vérin.The invention also relates to an autonomous cylinder comprising a motor, a body forming a reservoir for the fluid, a pump driven by the motor and associated with a control device, and a base on which is fixed a set of cylinder and rod. cylinder, characterized in that it comprises two integrated control devices as defined above, incorporated in the base and suitably connected, on the one hand, to the pump and, on the other hand, to the two cylinder working chambers.

Suivant d'autres caractéristiques :

  • - le corps formant réservoir comprend deux parties disposées de part et d'autre de l'embase et communiquant par des passages ménagés dans cette embase, l'une de ces parties entourant comme connu en soi la pompe, tandis que l'autre partie entoure l'ensemble de vérin ;
  • - la deuxième partie du corps et l'ensemble de vérin sont montés sur un prolongement axial de l'embase et fixés sur cette embase par au moins un jonc élastique ;
  • - le moteur, la pompe et la première partie du réservoir sont fixés sur l'ambase au moyen de tirants, la pompe et le réservoir étant serrés entre un flasque du moteur et une face de l'embase ;
  • - l'orifice d'aspiration de la pompe se trouve au voisinage de l'axe longitudinal du vérin et, lorsque ce dernier est monté oscillant autour de deux tourillons, au voisinage du point d'intersection entre l'axe de ces tourillons et l'axe longitudinal du vérin.
According to other characteristics:
  • - The reservoir body comprises two parts arranged on either side of the base and communicating by passages formed in this base, one of these parts surrounding the pump as known per se, while the other part surrounds the cylinder assembly;
  • - The second part of the body and the cylinder assembly are mounted on an axial extension of the base and fixed to this base by at least one elastic ring;
  • - The engine, the pump and the first part of the tank are fixed to the base by means of tie rods, the pump and the tank being clamped between a flange of the engine and one face of the base;
  • - The suction port of the pump is located in the vicinity of the longitudinal axis of the cylinder and, when the latter is mounted oscillating around two journals, in the vicinity of the point of intersection between the axis of these journals and l 'longitudinal axis of the jack.

L'invention va être décrite plus en détail ci-après en se référant aux dessins annexés, donnés uniquement à titre d'exemple et sur lesquels :

  • - la Fig. 1 est une vue en coupe longitudinale d'un dispositif de commande intégré suivant l'invention ;
  • - la Fig. 2 est un schéma montrant une application particulière d'un tel dispositif ;
  • - la Fig. 3 est une vue en partie en élévation latérale et en partie en coupe d'un vérin autonome réalisé conformément à l'invention. On a représenté sur la Fig. 1 un dispositif de commande intégré comprenant un corps 1 muni de moyens de montage (non représentés) permettant de l'incorporer à un circuit de commande à fluide. Dans ce corps est ménagé un logement d'axe X-X qui le traverse de part en part et qui comporte principalement trois parties :
  • - une partie supérieure 2 qui reçoit un étage limiteur de pression ;
  • - un étage intermédiaire 3 qui reçoit des moyens de pilotage actionnés à partir de la pression déterminée par le limiteur ;
  • - une partie inférieure 4 qui correspond à un étage clapet de retenue et dispositif de freinage.
The invention will be described in more detail below with reference to the accompanying drawings, given solely by way of example and in which:
  • - Fig. 1 is a view in longitudinal section of an integrated control device according to the invention;
  • - Fig. 2 is a diagram showing a particular application of such a device;
  • - Fig. 3 is a view partly in side elevation and partly in section of an autonomous cylinder produced in accordance with the invention. There is shown in FIG. 1 an integrated control device comprising a body 1 provided with mounting means (not shown) making it possible to incorporate it into a fluid control circuit. In this body is housed an axis XX which passes right through it and which mainly comprises three parts:
  • - an upper part 2 which receives a pressure limiting stage;
  • - an intermediate stage 3 which receives control means actuated from the pressure determined by the limiter;
  • - A lower part 4 which corresponds to a check valve stage and braking device.

Ces trois parties vont être décrites successivement.These three parts will be described successively.

L'étage limiteur de pression comprend une première pièce rapportée 10, fixée dans le corps par vissage, qui est évidée et comporte un fond 11 et une paroi latérale 12. Dans le fond de cette pièce est ménagé un orifice 13 et ce même fond sert de siège pour un obturateur 14 qui, dans l'exemple choisi, a une forme conique. Cet obturateur est maintenu en position de fermeture par un ressort 15 en appui contre le fond 16 d'une pièce 17 elle-même vissée de façon réglable dans la première pièce rapportée 10. Cette vis 17 comporte par ailleurs une jupe 18 reçue à joint étanche dans la pièce rapportée 10. A sa partie supérieure cette dernière est obturée par un bouchon 19. Elle comporte par ailleurs une gorge circonférentielle 20 communiquant par un ou plusieurs passages 21 avec son évidement interne et avec un conduit 5 de mise à la bâche, percé dans le corps 1. Des garnitures d'étanchéité 22, 23 sont prévues entre cette pièce rapportée et la paroi adjacente du corps.The pressure relief stage comprises a first insert 10, fixed in the body by screwing, which is hollowed out and has a bottom 11 and a side wall 12. In the bottom of this piece is an orifice 13 and this same bottom serves seat for a shutter 14 which, in the example chosen, has a conical shape. This shutter is held in the closed position by a spring 15 bearing against the bottom 16 of a part 17 which is itself screwed in an adjustable manner in the first insert 10. This screw 17 also comprises a skirt 18 received with a tight seal in the insert 10. At its upper part, the latter is closed by a plug 19. It also has a circumferential groove 20 communicating by one or more passages 21 with its internal recess and with a conduit 5 for covering, pierced in the body 1. Seals 22, 23 are provided between this insert and the adjacent wall of the body.

Dans sa partie intermédiaire 3, le corps 1 reçoit à joint à peu près étanche une deuxième pièce rapportée 30 qui peut être simplement maintenue par la pièce 10 en appui contre un épaulement radial 38 du corps ou être vissée dans ce corps. Cette deuxième pièce est également évidée et comporte un fond 31 et une paroi latérale 32 qui assure le guidage d'un piston 33 dont le fond fait directement face au fond 11 de la pièce 10. Pour maintenir un intervalle entre la deuxième pièce rapportée 30 et le piston 33, d'une part, et la première pièce rapportée 10, d'autre part, cette dernière comporte sur sa face extérieure un croisillon 24 ou tout autre moyen équivalent. Cet intervalle constitue une chambre 25. Le fond de la deuxième pièce rapportée est percé d'un orifice 34 et constitue un siège pour une bille 40 d'un clapet de retenue. L'orifice 34 autorise également le passage d'un poussoir 35 solidaire du piston 33 ou en appui contre le fond de ce dernier est sollicité vers le haut en regardant vers le dessin par un ressort 36 lui-même en appui contre le fond 31 de la pièce 30. Le volume interne de cette dernière communique avec le volume délimité par la partie adjacente du corps par au moins un orifice 37. Cette partie du corps est par ailleurs également reliée à la bâche par un conduit 6.In its intermediate portion 3, the body 1 receives seal around sealing a second insert 30 which may simply be held by the part 10 in abutment against a radial shoulder 8 of the body 3 or may be screwed into the body. This second part is also hollowed out and has a bottom 31 and a side wall 32 which guides a piston 33, the bottom of which directly faces the bottom 11 of the part 10. To maintain an interval between the second added part 30 and the piston 33, on the one hand, and the first insert 10, on the other hand, the latter comprises on its outer face a crosspiece 24 or any other equivalent means. This interval constitutes a chamber 25. The bottom of the second insert is pierced with an orifice 34 and constitutes a seat for a ball 40 of a check valve. The orifice 34 also allows the passage of a pusher 35 integral with the piston 33 or bearing against the bottom of the latter is urged upward looking towards the drawing by a spring 36 itself bearing against the bottom 31 of the part 30. The internal volume of the latter communicates with the volume delimited by the adjacent part of the body by at least one orifice 37. This part of the body is also also connected to the cover by a conduit 6.

Suivant une caractéristique particulièrement intéressante, l'extrémité du poussoir 35 adjacente au clapet de retenue 40 présente un profil de section variable de façon à pouvoir délimiter avec le fond de la pièce 30 un passage dont la section libre varie en fonction de la position axiale du poussoir ; ce dernier peut à cet effet présenter toute forme convenable et comporter par exemple des fentes obliques 38. Une garniture 39 est par ailleurs prévue entre le fond 31 et un épaulement radial 3b du corps 1.According to a particularly advantageous characteristic, the end of the pusher 35 adjacent to the check valve 40 has a profile of variable section so as to be able to delimit with the bottom of the part 30 a passage whose free section varies as a function of the axial position of the pusher; the latter may for this purpose have any suitable shape and comprise for example oblique slots 38. A lining 39 is also provided between the bottom 31 and a radial shoulder 3 b of the body 1.

Dans sa partie inférieure 4 le corps délimite un alésage étagé de section plus faible comportant dans une partie intermédiaire un épaulement radial 4a sur lequel est en appui un ressort 41 qui agit sur la bille 40 pour l'appliquer contre son siège. La chambre délimitée par le corps entre cet épaulement et la deuxième pièce rapportée est reliée à un conduit 7 de retour de fluide. Il est prévu par ailleurs dans cette partie du corps un doigt de butée 42 qui détermine la course de déplacement du clapet de retenue 40 sous l'action du poussoir 35, la position de cette butée étant déterminée par une vis de réglage 43 comportant un joint d'étanchéité 44.In its lower part 4 the body delimits a stepped bore of smaller section comprising in an intermediate part a radial shoulder 4a on which is supported a spring 41 which acts on the ball 40 to apply it against its seat. The chamber delimited by the body between this shoulder and the second insert is connected to a conduit 7 for the return of fluid. There is also provided in this part of the body an abutment finger 42 which determines the displacement stroke of the check valve 40 under the action of the pusher 35, the position of this abutment being determined by an adjustment screw 43 comprising a seal. sealing 44.

La partie inférieure (sur le dessin) du perçage ménagé dans le corps est également obturée par un bouchon étanche 45.The lower part (in the drawing) of the bore formed in the body is also closed by a tight plug 45.

Pour expliquer le fonctionnement d'un tel dispositif on supposera que la chambre 25 est reliée par un conduit 8, d'une part, à une source de fluide sous pression (pompe 50 sur la Fig. 2) et, d'autre part, par l'intermédiaire d'un clapet anti-retour 51 à une chambre de travail 52 d'un verin 53. Le conduit 7 est supposé être relié à la deuxième chambre 54 du vérin et reçoit donc du fluide en provenance de cette deuxième chambre. Les conduits 5 et 6 ainsi qu'un conduit 55 d'aspiration de la pompe, associé à deux clapets anti-retour 56, 57 sont reliés à un réservoir de fluide 58. Sur le schéma de la Fig. 2, la pompe 50 est à deux sens de rotation et l'on conçoit que le schéma peut être complété pour réaliser une commande à double effet du vérin 53, par un deuxième circuit équivalent à celui représenté et assurant l'alimentation de la chambre 54 (à partir du conduit 59) et le freinage du fluide provenant de la chambre 52.To explain the operation of such a device, it will be assumed that the chamber 25 is connected by a conduit 8, on the one hand, to a source of pressurized fluid (pump 50 in FIG. 2) and, on the other hand, by means of a non-return valve 51 to a working chamber 52 of a jack 53. The duct 7 is assumed to be connected to the second chamber 54 of the jack and therefore receives fluid from this second chamber. The conduits 5 and 6 as well as a pump suction conduit 55, associated with two non-return valves 56, 57 are connected to a fluid reservoir 58. In the diagram of FIG. 2, the pump 50 is in two directions of rotation and it is understood that the diagram can be completed to achieve a double-acting control of the jack 53, by a second circuit equivalent to that shown and ensuring the supply of the chamber 54 (from the conduit 59) and the braking of the fluid coming from the chamber 52.

On se contentera d'expliquer le fonctionnement du dispositif pour une séquence correspondant à la partie du schéma qui est représentée, et en se référant principalement à la Fig. 1.We will simply explain the operation of the device for a sequence corresponding to the part of the diagram which is represented, and with reference mainly to FIG. 1.

En l'absence de pression d'alimentation dans la chambre 25, le piston 33 occupe la position représentée sur le dessin et la bille 40 du clapet de retenue est appliquée contre son siège 31, bloquant ainsi le trajet de retour du fluide par le conduit 7.In the absence of supply pressure in the chamber 25, the piston 33 occupies the position shown in the drawing and the ball 40 of the check valve is applied against its seat 31, thereby blocking the return path of the fluid through the conduit 7.

Si du fluide sous pression est fourni à la chambre 25, l'obturateur 14 du limiteur de pression se soulève et établit dans le circuit une pression déterminée. Cette pression s'exerce sur le piston 33 qui se déplace vers le bas et pilote ainsi l'ouverture du clapet de retenue en éloignant la bille 40 de son siège. La fonction de freinage remplie par ce lapet peut alors, suivant une caractéristique importante de l'invention, être remplie de deux façons différentes :

  • - si la course libre de la bille 40 est faible, la section de freinage est déterminée par le passage libre entre la bille et son siège ;
  • - dans une variante on peut également prévoir que l'action du piston 33 et du poussoir 35 sur la bille provoque dans un premier temps l'ouverture d'un passage pratiquement libre pour le fluide de retour, provoquant ainsi une décompression dans le circuit de retour, suivie d'une limitation de la section de passage déterminée alors par l'intervalle entre le poussoir 35 et le fond 31 de la pièce 30.
If pressurized fluid is supplied to the chamber 25, the shutter 14 of the pressure limiter rises and establishes a determined pressure in the circuit. This pressure is exerted on the piston 33 which moves down and thus controls the opening of the check valve by moving the ball 40 away from its seat. The braking function fulfilled by this lap can then, according to an important characteristic of the invention, be fulfilled in two different ways:
  • - If the free stroke of the ball 40 is small, the braking section is determined by the free passage between the ball and its seat;
  • - In a variant, it is also possible to provide that the action of the piston 33 and of the plunger 35 on the ball initially causes the opening of a practically free passage for the return fluid, thus causing decompression in the circuit of return, followed by a limitation of the passage section then determined by the interval between the pusher 35 and the bottom 31 of the part 30.

Les principaux avantages procurés par un tel dispositif sont les suivants :

  • - on dispose dans un ensemble d'encombrement particulièrement faible de moyens remplissant plusieurs fonctions : limiteur de pression, clapet de retenue et de freinage, pilotage de ce clapet de retenue par la pression établie par le limiteur ;
  • - les organes de réglage 17 et 43 du limiteur de pression et du clapet de retenue sont accessibles de part et d'autre du corps, de façon très commode puisqu'il suffit d'enlever les bouchons 19 et 45 ;
  • - le limiteur de pression constitue un sous-ensemble qui peut être démonté aisément, sans que son réglage soit d'ailleurs modifié, ce démontage permettant d'accéder aux moyens de pilotage et au clapet de retenue ;
  • - étant donné l'emplacement du limiteur de pression et du piston de pilotage, la pression qui agit sur ce dernier est exactement la même que celle qui règne au niveau du limiteur, ce qui assure au dispositif une grande précision de fonctionnement ;
  • - ainsi qu'on l'a mentionné ci-dessus, il est possible par un simple réglage de disposer de deux modes de fonctionnement différents du clapet de retenue et de freinage, ce freinage pouvant être obtenu soit immédiatement, soit après passage par une position autorisant un passage à peu près libre du fluide et provoquant ainsi une décompression du circuit de retour. C'est cette dernière configuration qui a été figurée sur le schéma de la Fig. 2.
The main advantages provided by such a device are as follows:
  • - We have in a particularly small overall space means fulfilling several functions: pressure relief valve, check and braking valve, control of this check valve by the pressure established by the limiter;
  • - The adjustment members 17 and 43 of the pressure relief valve and the check valve are accessible on either side of the body, very conveniently since it suffices to remove the plugs 19 and 45;
  • - The pressure relief valve constitutes a sub-assembly which can be disassembled easily, without its setting being modified, this disassembly giving access to the control means and to the check valve;
  • - given the location of the pressure relief valve and the pilot piston, the pressure acting on the latter is exactly the same as that prevailing at the level of the relief valve, which provides the device with high operating precision;
  • - As mentioned above, it is possible by a simple adjustment to have two different operating modes of the check and braking valve, this braking can be obtained either immediately or after passing through a position allowing an almost free passage of the fluid and thus causing a decompression of the return circuit. It is this latter configuration which has been shown in the diagram in FIG. 2.

Suivant une autre variante, la pièce 30 étant bloquée dans le corps 1, et le croisillon 24 ou moyen équivalent ayant un encombrement radial tel qu'il n'interfère pas avec cette pièce 30, on peut, par vissage de la pièce 10 dans le corps, maintenir de façon positive la bille 40 éloignée de son siège, ce qui peut se révéler particulièrement intéressant par exemple pour obtenir un mouvement libre du vérin associé.According to another variant, the part 30 being blocked in the body 1, and the spider 24 or equivalent means having a radial size such that it does not interfere with this part 30, it is possible, by screwing the part 10 into the body, positively hold the ball 40 away from its seat, which can be particularly advantageous for example to obtain free movement of the associated jack.

On a représenté de façon schématique à la Fig. 3 un vérin dit autonome, c'est-à-dire comprenant un moteur et une pompe incorporés, comprenant deux dispositifs de commande suivant l'invention disposés dans un même corps qui est ici constitué par une embase 100. Ces deux dispositifs sont désignés par les références 101 et 102 et l'on n'aperçoit sur le dessin que les bouchons qui correspondent au bouchon 19 sur la Fig. 1. Dans cette embase sont par ailleurs prévus deux logements 103, 104 pour des tourillons d'axe Y-Y perpendiculaire à l'axe Z-Z du vérin.There is shown schematically in FIG. 3 a so-called autonomous cylinder, that is to say comprising a motor and a pump incorporated, comprising two control devices according to the invention arranged in the same body which is here constituted by a base 100. These two devices are designated by the references 101 and 102 and one sees on the drawing only the plugs which correspond to the plug 19 in FIG. 1. In this base are also provided two housings 103, 104 for pins of axis Y-Y perpendicular to the axis Z-Z of the jack.

Ce dernier comprend un moteur électrique 105, une pompe 106 associée à un bloc de clapets 107 qui correspond aux clapets 56, 57 sur la Fig. 2. Cette pompe est entourée par un corps cylindrique 108 et l'ensemble du moteur, de la pompe et du corps 108 est fixé sur l'embase 10G au moyen de tirants 109 ou autres organes de fixation équivalents. Une liaison d'entraînement est par ailleurs prévue entre l'arbre de sortie 110 du moteur et la pompe.The latter comprises an electric motor 105, a pump 106 associated with a block of valves 107 which corresponds to the valves 56, 57 in FIG. 2. This pump is surrounded by a cylindrical body 108 and the assembly of the motor, the pump and the body 108 is fixed to the base 10G by means of tie rods 109 or other equivalent fixing members. A drive link is also provided between the output shaft 110 of the motor and the pump.

Sur l'autre côté de l'embase est monté un ensemble de vérin proprement dit constitué par un cylindre 111 dans lequel est reçu un piston 112 solidaire d'une tige 113, le piston et le cylindre délimitant deux chambres 114 et 115. Le cylindre 111 est reçu dans un alésage 116 d'un prolongement axial 117 de l'embase. Il est également reçu dans un alésage 118 d'un flasque 119 qui porte une bague 120 de guidage de la tige 113. Cet ensemble est complété par un corps cylindrique 121 qui est rendu solidaire, d'une part, du prolongement 117 de l'embase et, d'autre part, du flasque 119 au moyen de deux joncs élastiques 122, 123 reçus dans des rainures circonférentielles de ces différentes pièces. Pour permettre un démontage aisé, il est prévu en divers emplacements, par exemple en trois points disposés à 120° l'un par rapport à l'autre, des orifices tels que 124, 125 ménagés dans le corps cylindrique 121 et qui permettent de comprimer les joncs élastiques.On the other side of the base is mounted a cylinder assembly proper consisting of a cylinder 111 in which is received a piston 112 secured to a rod 113, the piston and the cylinder defining two chambers 114 and 115. The cylinder 111 is received in a bore 116 of an axial extension 117 of the base. It is also received in a bore 118 of a flange 119 which carries a ring 120 for guiding the rod 113. This assembly is completed by a cylindrical body 121 which is made integral, on the one hand, with the extension 117 of the base and, on the other hand, the flange 119 by means of two elastic rods 122, 123 received in the circumferential grooves of these different parts. To allow easy disassembly, there are provided at various locations, for example at three points arranged at 120 ° relative to each other, orifices such as 124, 125 formed in the cylindrical body 121 and which make it possible to compress elastic bands.

On n'a pas représenté en détail sur ce dessin les divers conduits qui réalisent des liaisons hydrauliques entre la pompe, les dispositifs de commande 101, 102, les chambres 114, 115 du vérin et le réservoir de fluide délimité par les corps 108 et 121. La réalisation de ces diverses liaisons est à la portée de l'homme de l'art et n'a pas à faire l'objet d'une description détaillée. On indiquera simplement que l'embase comporte des passages mettant en communication les deux parties du réservoir, et que les retours à la bâche de la pompe et des deux dispositifs de commande s'effectuent par l'intermédiaire d'un même conduit 126 débouchant dans la partie du réservoir délimitée par le corps 121. Dans ces passages traversant l'embase peuvent être prévus des moyens de filtration du fluide. Par contre, l'aspiration de la pompe s'effectue dans la partie du réservoir délimitée par le corps 108, par exemple, par des conduits 127, 128 convergeant en un point 129 qui est aussi proche que possible du point d'intersection entre les deux axes Y-Y et Z-Z. On assure ainsi une bonne circulation du fluide, améliorant son refroidissement, et une alimentation correcte de la pompe quelles que soient les variations de position du vérin, rendant ainsi inutile dans la majorité des cas la présence de compensateurs.The various conduits which provide hydraulic connections between the pump, the control devices 101, 102, the chambers 114, 115 of the jack and the fluid reservoir delimited by the bodies 108 and 121 have not been shown in detail in this drawing. The realization of these various connections is within the reach of those skilled in the art and has not not to be the subject of a detailed description. It will simply be indicated that the base has passages connecting the two parts of the tank, and that the returns to the tank of the pump and of the two control devices are effected by means of the same conduit 126 opening into the part of the reservoir delimited by the body 121. In these passages passing through the base can be provided means for filtering the fluid. On the other hand, the suction of the pump takes place in the part of the reservoir delimited by the body 108, for example, by conduits 127, 128 converging at a point 129 which is as close as possible to the point of intersection between the two axes YY and ZZ. This ensures good circulation of the fluid, improving its cooling, and a correct supply of the pump whatever the variations in position of the jack, thus making the presence of compensators unnecessary in the majority of cases.

Le fonctionnement d'un tel vérin est classique. Par contre, sa construction originale entraîne un certain nombre d'avantages :

  • - tout d'abord son encombrement en longueur est particulièrement faible étant donné que le bloc de commande qui était habituellement interposé entre la pompe et l'embase est ici incorporé à cette dernière ;
  • - les deux limiteurs de pression et les deux vis de réglage des moyens de freinage des trajets de retour sont accessibles aisément de l'extérieur, ce qui permet un réglage aisé de l'ensemble des fonctions du dispositif ;
  • - le montage et le démontage de l'ensemble sont particulièrement aisés et rapides ;
  • - les risques de fuite sont diminués car le nombre de garnitures d'étanchéité est réduit par rapport au montage classique ;
  • - le réservoir de fluide étant délimité en partie par un corps cylindrique entourant la partie active du vérin, son volume est ainsi proportionnel à la course du vérin, sans autre modification ;
  • - la surface d'échange thermique avec l'extérieur est accrue ce qui contribue à un meilleur refroidissement. Cette surface peut par ailleurs être augmentée par l'utilisation d'ailettes ou moyens analogues.
The operation of such a jack is conventional. However, its original construction has a number of advantages:
  • - First of all, its overall length is particularly small since the control unit which was usually interposed between the pump and the base is here incorporated into the latter;
  • - The two pressure limiters and the two adjusting screws for the braking means of the return paths are easily accessible from the outside, which allows easy adjustment of all the functions of the device;
  • - the assembly and disassembly of the assembly are particularly easy and rapid;
  • - the risk of leakage is reduced because the number of seals is reduced compared to conventional mounting;
  • the fluid reservoir being partially delimited by a cylindrical body surrounding the active part of the jack, its volume is thus proportional to the stroke of the jack, without any other modification;
  • - the heat exchange surface with the outside is increased, which contributes to better cooling. This surface can also be increased by the use of fins or the like.

Claims (17)

1. Control device for a fluid circuit, comprising a body (1) defining a cavity (2, 3, 4) which extends throughout said body and wherein are located two units one of which constitutes a fluid flow check and retarding valve, characterized in that the two units constitute, respectively, a first pressure limiting stage and a second stage constituting a fluid flow check and retarding valve and piloting means (33, 34, 36) are provided in said cavity (3) between the pressure limiting stage and the check and retarding valve stage for piloting the check and retarding valve by the pressure established by the limiter.
2. Device as claimed in claim 1, characterized in that the two stages comprise adjusting means (17, 43) which are accessible from outside the body.
3. Device as claimed in claim 1 or 2, characterized in that the cavity defined in the body comprises a first part (2) in which is fixed a first mounted element (10) defining a seat (11) for a valve member (14), said mounted element being hollow so as to receive the valve member (14), a calibrating spring (15) and a member (17) defining a bearing face for the spring, the inner volume of this mounted element (10) communicating with a chamber of the body which is connected to the tank, means being provided for adjusting the axial position of the member (17) defining the position of said bearing face for the spring.
4. Device as claimed in claim 1, 2 or 3, characterized in that the cavity defined in the body comprises a second part, receiving a second mounted element (30) which defines a guide surface for a piloting piston (33), a bearing surface for a return spring for said piston and a seat (31) for a valve member (40) of the second stage (4) of the device.
5. Device as claimed in claim 4, characterized in that the end of the piloting piston (33) directly faces the end (11) of the first mounted element (10) and means (24) are provided for maintaining said piston spaced from the first mounted element (10).
6. Device as claimed in claim 4, characterized in that the inner volume of the second mounted element (30) communicates by way of an orifice (37) with the adjacent cavity (3) of the body and with the tank by way of a conduit (6).
7. Device as claimed in any one of the claims 3 to 6, characterized in that the cavity defined in the body comprises a third part (4) which is separated from the second part (3) by the check valve and connected by a conduit (7) to a fluid return path.
8. Device as claimed in claim 4, characterized in that, as known per se, the travel of the valve member (40) of the second stage is determined by an abutment means (42) which is adjustable from outside the body.
9. Device as claimed in any one of the claims 3 to 8, characterized in that, as known per se, the piloting piston (33) is rigid with a rod (35) which is so arranged as to act as plunger for shifting the valve member (40) of the second stage away from its seat and to cooperate with the second mounted element (30) so as to define a variable throttling for the passage of the fluid.
10. Device as claimed in claim 9, characterized in that the travel of the valve member (40) of the check and retarding valve is such that there is established first of all a practically free passage for the fluid prior to the throttling determined by the plunger (35).
11. A self-contained cylinder structure comprising a motor (105), a body (108) forming a reservoir for the fluid, a pump (106) driven by the motor and associated with a control device (107), and a base (100) on which is fixed an assembly comprising a cylinder (111) and a rod (112,113) of the cylinder structure, characterized in that it comprises two control devices (101, 102) such as defined in any one of the preceding claims, incorporated and fixed to the base and suitably connected on one hand to the pump (106) and on the other hand to the two working chambers (114, 115) of the cylinder structure.
12. A cylinder structure as claimed in claim 11, characterized in that the body forming the reservoir comprises two parts (108, 121) disposed on each side of the base (100), and communicating by way of passages formed in the base, one of said parts surrounding the pump, as known per se, and the other part surrounding the cylinder structure proper (111, 112, 113).
13. Cylinder structure as claimed in claim 11 or 12, characterized in that the second part (121) of the body and the cylinder structure proper are mounted on an axial extension (117) of the base and fixed to the base by at least one resiliently yieldable ring (122).
14. Cylinder structure as claimed in claim 13, characterized in that an end wall (119) is provided between the cylinder (111) and the body (121), the body being fixed to the end wall by a resiliently yieldable ring (123).
15. Cylinder structure as claimed in any one of the claims 10 to 14, characterized in that the motor (105), the pump (106) and the first part (108) of the reservoir are fixed to the base by means of tie rods (109), the pump and the reservoir being clamped between a wall of the motor and a face of the base.
16. Cylinder structure as claimed in any one of the claims 11 to 15, characterised in that the suction orifice of the pump (106) is located in the vicinity of the longitudinal axis (Z-Z) of the cylinder structure and, when the cylinder structure is mounted to pivot about two trunnions, in the vicinity of the point of intersection between the axis (Y-Y) of the trunnions and the longitudinal axis (Z-Z) of the cylinder structure.
17. Cylinder structure as claimed in claim 12, characterized in that continuous filtering means are disposed in the passages formed in the base.
EP79400311A 1978-06-01 1979-05-17 Control device for an hydraulic circuit and hydraulic motor unit incorporating such a circuit Expired EP0006045B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400311T ATE388T1 (en) 1978-06-01 1979-05-17 CONTROL DEVICE FOR A HYDRAULIC CIRCUIT AND AUTONOMOUS ACTUATOR INTO WHICH THIS CIRCUIT IS INTEGRATED.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7816390A FR2427499A1 (en) 1978-06-01 1978-06-01 INTEGRATED CONTROL DEVICE FOR FLUID CIRCUIT, AND ITS APPLICATIONS
FR7816390 1978-06-01

Publications (2)

Publication Number Publication Date
EP0006045A1 EP0006045A1 (en) 1979-12-12
EP0006045B1 true EP0006045B1 (en) 1981-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400311A Expired EP0006045B1 (en) 1978-06-01 1979-05-17 Control device for an hydraulic circuit and hydraulic motor unit incorporating such a circuit

Country Status (7)

Country Link
US (1) US4240255A (en)
EP (1) EP0006045B1 (en)
AT (1) ATE388T1 (en)
CA (1) CA1132440A (en)
DE (1) DE2961303D1 (en)
ES (1) ES481146A1 (en)
FR (1) FR2427499A1 (en)

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US4240255A (en) 1980-12-23
ATE388T1 (en) 1981-11-15
EP0006045A1 (en) 1979-12-12
DE2961303D1 (en) 1982-01-14
FR2427499B1 (en) 1981-11-27
FR2427499A1 (en) 1979-12-28
ES481146A1 (en) 1980-10-01
CA1132440A (en) 1982-09-28

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