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EP0088017B1 - Hydraulic directional spool valve - Google Patents

Hydraulic directional spool valve Download PDF

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Publication number
EP0088017B1
EP0088017B1 EP19830400385 EP83400385A EP0088017B1 EP 0088017 B1 EP0088017 B1 EP 0088017B1 EP 19830400385 EP19830400385 EP 19830400385 EP 83400385 A EP83400385 A EP 83400385A EP 0088017 B1 EP0088017 B1 EP 0088017B1
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EP
European Patent Office
Prior art keywords
channel
bore
grooves
chamber
source
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
EP19830400385
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German (de)
French (fr)
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EP0088017A2 (en
EP0088017A3 (en
Inventor
Claude Bouveret
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.)
Compagnie Parisienne dOutillage a Air Comprime SA
Original Assignee
Compagnie Parisienne dOutillage a Air Comprime SA
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Publication of EP0088017A2 publication Critical patent/EP0088017A2/en
Publication of EP0088017A3 publication Critical patent/EP0088017A3/en
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Publication of EP0088017B1 publication Critical patent/EP0088017B1/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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage

Definitions

  • the subject of the invention is a hydraulic distribution device with a slide valve of the servo-valve type comprising a body closed at one of its ends by a cap, this body enclosing a fur, said fur as well as said body comprising bores in which can slide a drawer, grooves being formed in said body and said fur, a central groove communicating with a source of pressurized fluid, two use grooves arranged on either side of said central groove, and two extreme grooves communicating with a source of low pressure fluid, said slide comprising two axial bores, a first bore provided with a movable means for closing it and into which open a first pipe connected to the source of pressurized fluid and a second pipe connected to the low pressure fluid source, the bottom of said bore constituting a first chamber, and a second bore comprising a feedback needle coming into abutment i at one of its ends against the bottom of the cap, the bottom of said second bore constituting a second chamber communicating permanently with said source of pressurized fluid, said movable means being
  • Such a device is known from document FR-A-2112323.
  • the mobile control means is constituted by a piston movable in translation on which large forces must be applied.
  • the device according to the invention making it possible to operate with a low control force is characterized in that the control chamber is constituted by the first chamber, in that said movable means is a helical thread screw driven in rotation in said first bore by said motor, the net balance in front ends of the first and the second pipe opening into said first bore, said 'ends being spaced apart by at least one pitch of the screw thread, and in that the thread of the screw uncovers for one direction of rotation the end of the first pipe and for the other direction of rotation the end of the second pipe.
  • the reference 100 designates a body of circular section closed at one of its ends by a cap 102.
  • a bore 103 receiving a fur 104, seals such as 105 being advantageously disposed between said body 100 and said fur 104.
  • a first bore 109 is capable of receiving a screw 110 with a helical thread, the raised and recessed portions of said thread being referenced 111A and 1118 respectively, said screw 110 being linked by means of a shaft 112 to a rotary drive means 113 such as a digitally controlled stepping motor, an O-ring 114 ensuring the tightness of said shaft 112.
  • a rotary drive means 113 such as a digitally controlled stepping motor
  • O-ring 114 ensuring the tightness of said shaft 112.
  • the bottom of said bore 109 constitutes a first chamber 115.
  • a second bore 116 is made in the drawer 108 opposite the first bore 109, a member known as a feedback needle 117 being disposed in this bore 116 and coming into abutment by means of one of its ends against the bottom of the cap 102, the space delimited by the other end of the feedback needle 117 and the bottom of the second bore 116 constituting a second chamber 118 whose section is substantially half of the section of the first room 115.
  • the single figure also shows that in the body 100 and the fur 104 are successively formed a central groove 120 communicating with a source of pressurized oil P via a line 121, two so-called use grooves being arranged on either side of the central groove 120, a first groove 122 and a second groove 123 communicating by way of example, each with one of the compartments of a jack (not shown) and this by means of lines 124 and 125 respectively, and finally two extreme grooves 126 and 127 communicating with an oil tank under atmospheric pressure T, and this via lines 128 and 129 respectively.
  • the periphery of the drawer 108 comprises a first median annular recess 130, as well as a second 131 and a third 132 annular recesses arranged on either side of the median recess 130.
  • the central recess 130 communicates on the one hand with a first pipe 133 whose outlet orifice opens at the level of the screw 110 and on the other hand with a second pipe 134 opening into said chamber 118 of the second bore 116.
  • the second recess 131 communicates with a pipe 135, the outlet orifice of which also opens at the level of the screw 110.
  • the diameter of the orifices of the pipes 133 and 135 is substantially equal to half the width of the thread of the screw 110, ie a quarter of the pitch of said screw.
  • a pipe 143 machined in the body 100 makes it possible to put the front and rear parts of the drawer 108 in communication and thus to drain outwards the oil leaks spreading inside the cap 102 in particular.
  • the pressure P prevailing in the second chamber 118 will therefore move the drawer 108 towards the left thus communicating the median annular recess 130 with the groove 123 communicating via the conduit 125 for example with one of the compartments of the jack (not shown), while the annular recess 132 communicating with the groove 127 and the pipe 129 will relate the groove 122 and the pipe 124 connected to the other compartment of the jack at atmospheric pressure.
  • the movement of the drawer 108 stops as soon as the screw 110 is stopped maneuvering by means of the stepping motor 113; if the operation of said screw 110 is continued, the slide continues its stroke.
  • the device according to the invention makes it possible to transform any rotary movement into a linear movement by following the helical thread of the screw 110. It therefore has the advantages previously listed.

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

Description

L'invention a pour objet un dispositif de distribution hydraulique à tiroir du type servo-valve comportant un corps obturé à l'une de ses extrémités par un capuchon, ce corps enserrant une fourrure, ladite fourrure ainsi que ledit corps comportant des alésages dans lesquels peut coulisser un tiroir, des gorges étant ménagées dans ledit corps et ladite fourrure, une gorge médiane communiquant avec une source de fluide sous pression, deux gorges d'utilisation disposées de part et d'autre de ladite gorge médiane, et deux gorges extrêmes communiquant avec une source de fluide à basse pression, ledit tiroir comportant deux alésages axiaux, un premier alésage muni d'un moyen mobile l'obturant et dans lequel débouchent une première canalisation reliée à la source de fluide sous pression et une seconde canalisation reliée à la source de fluide basse pression, le fond dudit alésage constituant une première chambre, et un deuxième alésage comportant une aiguille de contre-réaction venant en appui à une de ses extrémités contre le fond du capuchon, le fond dudit deuxième alésage constituant une deuxième chambre communiquant en permanence avec ladite source de fluide sous pression, ledit moyen mobile étant déplaçable par un moteur et mettant en communication selon le sens de déplacement une chambre de commande s'opposant à la seconde chambre et de section droite supérieure à celle de cette dernière, soit avec ladite source de fluide sous pression par l'intermédiaire de la première canalisation, soit avec ladite source de fluide à basse pression par l'intermédiaire de la seconde canalisation, ledit tiroir se trouvant ainsi entraîné dans un sens ou en sens inverse et faisant ainsi communiquer d'une part l'une desdites gorges d'utilisation avec la source de fluide sous pression et d'autre part l'autre gorge d'utilisation avec la source de fluide à base pression et vice versa.The subject of the invention is a hydraulic distribution device with a slide valve of the servo-valve type comprising a body closed at one of its ends by a cap, this body enclosing a fur, said fur as well as said body comprising bores in which can slide a drawer, grooves being formed in said body and said fur, a central groove communicating with a source of pressurized fluid, two use grooves arranged on either side of said central groove, and two extreme grooves communicating with a source of low pressure fluid, said slide comprising two axial bores, a first bore provided with a movable means for closing it and into which open a first pipe connected to the source of pressurized fluid and a second pipe connected to the low pressure fluid source, the bottom of said bore constituting a first chamber, and a second bore comprising a feedback needle coming into abutment i at one of its ends against the bottom of the cap, the bottom of said second bore constituting a second chamber communicating permanently with said source of pressurized fluid, said movable means being movable by a motor and putting in communication according to the direction of movement a control chamber opposing the second chamber and having a cross section greater than that of the latter, either with said source of pressurized fluid via the first pipe, or with said source of low pressure fluid via the intermediate of the second pipe, said drawer thus being driven in one direction or in opposite direction and thus communicating on the one hand one of said grooves of use with the source of pressurized fluid and on the other hand the other throat of use with the pressure-based fluid source and vice versa.

Un tel dispositif est connu du document FR-A-2112323.Such a device is known from document FR-A-2112323.

Dans le dispositif connu le moyen mobile de commande est constitué par un piston mobile en translation sur lequel on doit appliquer des efforts importants.In the known device, the mobile control means is constituted by a piston movable in translation on which large forces must be applied.

Le dispositif selon l'invention permettant de fonctionner avec un faible effort de commande est caractérisé en ce que la chambre de commande est constituée par la première chambre, en ce que ledit moyen mobile est une vis à filet hélicoîdal entraînée en rotation dans ledit premier alésage par ledit moteur, le filet à l'équilibre se trouvant devant les extrémités de la première et de la seconde canalisation débouchant dans ledit premier alésage, lesdites' extrémités étant distantes d'au moins un pas du filet de la vis, et en ce que le filet de la vis découvre pour un sens de rotation l'extrémité de la première canalisation et pour l'autre sens de rotation l'extrémité de la seconde canalisation.The device according to the invention making it possible to operate with a low control force is characterized in that the control chamber is constituted by the first chamber, in that said movable means is a helical thread screw driven in rotation in said first bore by said motor, the net balance in front ends of the first and the second pipe opening into said first bore, said 'ends being spaced apart by at least one pitch of the screw thread, and in that the thread of the screw uncovers for one direction of rotation the end of the first pipe and for the other direction of rotation the end of the second pipe.

Il est ainsi possible d'utiliser un moteur de faible puissance.It is thus possible to use a low power motor.

L'invention sera mieux comprise à la lumière de la description d'un mode de réalisation du dispositif de distribution hydraulique représenté sur la figure unique.The invention will be better understood in the light of the description of an embodiment of the hydraulic distribution device shown in the single figure.

La référence 100 désigne un corps de section circulaire obturé à l'une de ses extrémités par un capuchon 102. Dans le corps 100 est pratiqué un alésage 103 recevant une fourrure 104, des joints d'étanchéité tels que 105 étant avantageusement disposés entre ledit corps 100 et ladite fourrure 104.The reference 100 designates a body of circular section closed at one of its ends by a cap 102. In the body 100 is made a bore 103 receiving a fur 104, seals such as 105 being advantageously disposed between said body 100 and said fur 104.

Dans la fourrure 10 ainsi que dans le capuchon 102 sont ménagés des alésages 106 et 107 respectivement dans lesquels peut coulisser un tiroir 108.In the fur 10 as well as in the cap 102 are provided bores 106 and 107 respectively in which a drawer 108 can slide.

Par ailleurs, dans le tiroir 108 un premier alésage 109 est apte à recevoir une vis 110 à filet hélicoïdal, les parties en relief et en creux dudit filet étant référencées 111A et 1118 respectivement, ladite vis 110 étant liée au moyen d'un arbre 112 à un moyen d'entraînement en rotation 113 tel qu'un moteur pas à pas à commande digitale, un joint torique 114 assurant l'étanchéité dudit arbre 112. Le fond dudit alésage 109 constitue une première chambre 115.Furthermore, in the drawer 108 a first bore 109 is capable of receiving a screw 110 with a helical thread, the raised and recessed portions of said thread being referenced 111A and 1118 respectively, said screw 110 being linked by means of a shaft 112 to a rotary drive means 113 such as a digitally controlled stepping motor, an O-ring 114 ensuring the tightness of said shaft 112. The bottom of said bore 109 constitutes a first chamber 115.

En outre un deuxième alésage 116 est pratiqué dans le tiroir 108 en vis-à-vis du premier alésage 109, un organe dit aiguille de contre réaction 117 étant disposé dans cet alésage 116 et venant an appui par l'intermédiaire de l'une de ses extrémités contre le fond du capuchon 102, l'espace délimité par l'autre extrémité de l'aiguille de contre-réaction 117 et le fond du deuxième alésage 116 constituant une deuxième chambre 118 dont la section est sensiblement la moitié de la section de la première chambre 115.In addition, a second bore 116 is made in the drawer 108 opposite the first bore 109, a member known as a feedback needle 117 being disposed in this bore 116 and coming into abutment by means of one of its ends against the bottom of the cap 102, the space delimited by the other end of the feedback needle 117 and the bottom of the second bore 116 constituting a second chamber 118 whose section is substantially half of the section of the first room 115.

La figure unique montre en outre que dans le corps 100 et la fourrure 104 sont ménagés successivement une gorge médiane 120 communiquant avec une source d'huile sous pression P par l'intermédiaire d'une conduite 121, deux gorges dites d'utilisation étant disposées de part et d'autre de la gorge médiane 120, une première gorge 122 et une deuxième gorge 123 communiquant à titre d'exemple, chacune avec l'un des compartiments d'un vérin (non représenté) et cela par l'intermédiaire de conduites 124 et 125 respectivement, et enfin deux gorges extrêmes 126 et 127 communiquant avec un réservoir d'huile sous pression atmosphérique T, et cela par l'intermédiaire de conduites 128 et 129 respectivement.The single figure also shows that in the body 100 and the fur 104 are successively formed a central groove 120 communicating with a source of pressurized oil P via a line 121, two so-called use grooves being arranged on either side of the central groove 120, a first groove 122 and a second groove 123 communicating by way of example, each with one of the compartments of a jack (not shown) and this by means of lines 124 and 125 respectively, and finally two extreme grooves 126 and 127 communicating with an oil tank under atmospheric pressure T, and this via lines 128 and 129 respectively.

Par ailleurs, on voit que la périphérie du tiroir 108 comporte un premier évidement annulaire médian 130, ainsi qu'un deuxième 131 et un troisième 132 évidements annulaires disposés de part et d'autre de l'évidement médian 130.Furthermore, it can be seen that the periphery of the drawer 108 comprises a first median annular recess 130, as well as a second 131 and a third 132 annular recesses arranged on either side of the median recess 130.

L'évidement médian 130 communique d'une part avec une première canalisation 133 dont l'orifice de sortie débouche au niveau de la vis 110 et d'autre part avec une deuxième canalisation 134 débouchant dans ladite chambre 118 du deuxième alésage 116.The central recess 130 communicates on the one hand with a first pipe 133 whose outlet orifice opens at the level of the screw 110 and on the other hand with a second pipe 134 opening into said chamber 118 of the second bore 116.

Le deuxième évidement 131 communique avec une canalisation 135 dont l'orifice de sortie débouche également au niveau de la vis 110.The second recess 131 communicates with a pipe 135, the outlet orifice of which also opens at the level of the screw 110.

Avantageusement, le diamètre des orifices des canalisations 133 et 135 est sensiblement égal à la moitié de la largeur du filet de la vis 110 soit au quart du pas de ladite vis.Advantageously, the diameter of the orifices of the pipes 133 and 135 is substantially equal to half the width of the thread of the screw 110, ie a quarter of the pitch of said screw.

De même la distance entre les orifices des canalisations 133 et 135 des donnée par la relation:

Figure imgb0001
dans laquelle p est le pas du filet de la vis 110, N un nombre entier (en général égal à 1) et d le diamètre desdits orifices des canalisations 133 et 135.Likewise the distance between the orifices of pipes 133 and 135 given by the relation:
Figure imgb0001
 in which p is the pitch of the thread of the screw 110, N is an integer (generally equal to 1) and d is the diameter of the said orifices in the pipes 133 and 135.

On voit également sur la figure un ressort 140 disposé dans une cavité du capuchon 102 et venant en appui sur deux rondelles 141A et 141 B, ce ressort étant destiné à centrer le tiroir 108 vis-à-vis de la fourrure 104, ainsi qu'un pion 142 apte à éviter toute rotation dudit tiroir 108.We also see in the figure a spring 140 placed in a cavity of the cap 102 and coming to bear on two washers 141A and 141 B, this spring being intended to center the drawer 108 with respect to the fur 104, as well as a pin 142 capable of preventing any rotation of said drawer 108.

Enfin une canalisation 143 usinée dans le corps 100 permet de mettre en communication les parties avant et arrière du tiroir 108 et de drainer ainsi vers l'extérieur les fuites d'huile se répandant à l'intérieur du capuchon 102 notamment.Finally, a pipe 143 machined in the body 100 makes it possible to put the front and rear parts of the drawer 108 in communication and thus to drain outwards the oil leaks spreading inside the cap 102 in particular.

Un tel dispositif fonctionne de la façon suivante:

  • En position d'arrêt comme représenté sur la figure, on voit que les orifices de sortie des deux canalisations 133 et 135 débouchent tous deux sur la partie en relief 111A du filet de la vis 110. En conséquence, il règne dans ladite première chambre 115 une pression
    Figure imgb0002
    P désignant la pression de l'huile comme précédemment mentionné et dans la deuxième chambre 118 une pression P, la section de ladite chambre 118 étant la moitié de celle de la chambre 115.
Such a device works as follows:
  • In the stopped position as shown in the figure, it can be seen that the outlet orifices of the two pipes 133 and 135 both open onto the raised part 111A of the thread of the screw 110. Consequently, it prevails in said first chamber 115 a pressure
    Figure imgb0002
     P designating the pressure of the oil as previously mentioned and in the second chamber 118 a pressure P, the section of said chamber 118 being half that of the chamber 115.

Si l'on suppose maintenant que l'on entraîne en rotation la vis 110 dans le sens de la flêche f au moyen du moteur pas à pas 113, on voit que l'orifice de sortie de la canalisation 135 va être mis progressivement en relation avec la partie creuse 111 B du filet de la vis 110 qui communique avec la première chambre 115, tandis qu l'orifice de sortie de la canalisation 133 demeure au contact de la partie en relief 111A de ladite vis 110. Il en résulte que dans la chambre 115, la pression va progressivement décroître jusqu'à la pression atmosphérique par suite de la mise en communication de cette chambre avec l'évidement annulaire 131 du tiroir communiquant avec la gorge 126 et la conduite 128. Dans le même temps, la pression P régnant dans la deuxième chambre 118 va donc déplacer le tiroir 108 vers la gaughe faisant ainsi communiquer l'évidement annulaire médian 130 avec la gorge 123 communiquant par l'intermédiaire de la conduite 125 par exemple avec l'un des compartiments du vérin (non représenté), tandis que l'évidement annulaire 132 communiquant avec la gorge 127 et la conduite 129 va mettre en relation la gorge 122 et la conduite 124 reliées à l'autre compartiment du vérin à la pression atmosphérique.If we now assume that the screw 110 is rotated in the direction of the arrow f by means of the stepping motor 113, it can be seen that the outlet orifice of the pipe 135 will be gradually brought into relationship with the hollow part 111 B of the thread of the screw 110 which communicates with the first chamber 115, while the outlet orifice of the pipe 133 remains in contact with the raised part 111A of said screw 110. It follows that in the chamber 115, the pressure will gradually decrease to atmospheric pressure as a result of the communication of this chamber with the annular recess 131 of the drawer communicating with the groove 126 and the pipe 128. At the same time, the pressure P prevailing in the second chamber 118 will therefore move the drawer 108 towards the left thus communicating the median annular recess 130 with the groove 123 communicating via the conduit 125 for example with one of the compartments of the jack (not shown), while the annular recess 132 communicating with the groove 127 and the pipe 129 will relate the groove 122 and the pipe 124 connected to the other compartment of the jack at atmospheric pressure.

Inversement si l'on suppose maintenant que l'on entraîne en rotation la vis 110 dans le sans de la flèche f' au moyen de moteur pas à pas 113, on voit que l'orifice de sortie de la canalisation 133 va être mis progressivement en relation avec la partie creuse 111B du filtet de la vis 110 qui comme précédemment mentionné communique avec la première chambre 115, tandis que l'orifice de sortie de la canalisation 135 demeure au contact de la partie en relief 111A de ladite vis 110. Il en résulte que dans la chambre 115, la pression va progressivement croître jusqu'à la valeur P, cette chambre communiquant donc avec la source d'huile à haute pression P par l'intermédiaire de l'évidement 130, de la gorge 120 et de la conduite 121. En conséquence le tiroir 108 va être entraîne vers la droite faisant ainsi communiquer l'évidement annulaire médian 130 avec la gorge 122 communiquant par l'intermédiaire de la conduite 124 avec l'autre compartiment du vérin (non représenté), tandis qui l'évidement annulaire 131 communiquant avec la gorge 126 et la conduite 128 va mettre en relation la gorge 123 et la conduite 125 reliées à l'autre compartiment du vérin sous pression atmosphérique.Conversely if we now assume that the screw 110 is rotated in the no of the arrow f 'by means of stepping motor 113, we see that the outlet of the pipe 133 will be gradually put in relation to the hollow part 111B of the thread of the screw 110 which, as previously mentioned, communicates with the first chamber 115, while the outlet orifice of the pipe 135 remains in contact with the raised part 111A of the said screw 110. It As a result, in the chamber 115, the pressure will gradually increase to the value P, this chamber therefore communicating with the source of high pressure oil P via the recess 130, the groove 120 and line 121. Consequently, the drawer 108 will be driven to the right thus making the median annular recess 130 communicate with the groove 122 communicating via the line 124 with the other compartment of the jack (not shown), while who the recess annular 131 communicating with the groove 126 and the pipe 128 will connect the groove 123 and the pipe 125 connected to the other compartment of the jack under atmospheric pressure.

Il faut noter que le déplacement du tiroir 108 s'arrête dès que l'on cesse de manoeuvrer la vis 110 au moyen du moteur pas à pas 113; si l'on poursuit la manoeuvre de ladite vis 110, le tiroir continue sa course.It should be noted that the movement of the drawer 108 stops as soon as the screw 110 is stopped maneuvering by means of the stepping motor 113; if the operation of said screw 110 is continued, the slide continues its stroke.

On voit donc que le dispositif selon l'invention permet de transformer tout mouvement rotatif en un mouvement linéaire par poursuite du filet hélicoïdal de la vis 110. Il présente de ce fait les avantages prédédemment énumérés.It can therefore be seen that the device according to the invention makes it possible to transform any rotary movement into a linear movement by following the helical thread of the screw 110. It therefore has the advantages previously listed.

En premier lieu une grande rapidté de réponse associée à une précision élevée du déplacement du tiroir.Firstly, a high response speed combined with high precision in the movement of the drawer.

En deuxième lieu une réponse en fréquence élevée par suite des faibles inerties mises en jeu.Second, a high frequency response due to the low inertias involved.

En outre, un faible encombrement associé à une mise en oeuvre simple dans un circuit hydraulique standard.In addition, a small footprint associated with simple implementation in a standard hydraulic circuit.

Par ailleurs, un déplacement du tiroir directement proportionnel à l'angle de rotation du moteur, donc, dans le cas d'un moteur pas à pas, au nombre d'impulsions transmises par le moteur.Furthermore, a displacement of the slide valve directly proportional to the angle of rotation of the motor, therefore, in the case of a stepping motor, to the number of pulses transmitted by the motor.

Enfin, une faible puissance d'entrée, de l'ordre de quelques watts seulement.Finally, low input power, on the order of just a few watts.

Claims (6)

1. A hydraulic distribution device of the servo-valve type comprising a body (100) closed at one of its ends by a cap (102), this body emprisoning a lining (104), said lining (104) as well as said body (100) comprising bores (106, 107) in which can slide a slider (108), grooves (120, 122, 123, 126, 127) being arranged in said body (100) and said lining (104), a central groove (120) communicating with a fluid pressure source (P), two utilisation grooves (122, 123) disposed on either side of said central groove (120) and two terminal grooves (126, 127) communicating with a low pressure fluid source (T), said slider (108) comprising two axial bores (109, 116), a first bore (109), which is supplied with a mobile means (110, 229) obturating it and in which terminates a first channel (133) connected to the fluid pressure source (P) and a second channel (135) connected to the low pressure fluid source (T), the bottom of said bore (109) constituting a first chamber (115), and a second bore (116) comprising a counter-reaction needle (117) resting at one of its ends against the bottom of the cap (102), the bottom of said second bore (116) constituting a second chamber (118) permanently communicating with said fluid pressure source (P), said mobile means (110, 229) being movable by a motor (113) and putting into communication, according to the moving direction, a control chamber (115) opposed to the second chamber (118) and of a cross-section greater than that of the latter, either with said fluid pressure source (P) via the first channel (133), or with said source of low pressure fluid (T) via the second channel (135), said slider (108) being thus driven into one direction or the inverse direction and thus making communicate on the one hand one of said utilisation grooves (122, 123) with the fluid pressure source (P) and on the other hand the other utilisation groove (122,123) with the low pressure fluid source (T) and vice-versa, characterised in that the control chamber is constituted by the first chamber (115), that said mobile means is a spiral-threaded screw (110) driven into rotation in said first bore (109) by said motor (113), the thread (111A) being placed in the equilibrium state in front of the ends of the first and the second channel (133, 135) terminating in said first bore (109), said ends being distanced by at least one pitch of the thread (111A) of the screw, and in that the thread (111A) of the screw (110) uncovers in one rotation direction the end of the first channel (113) and in the other rotation direction the end of the second channel (115).
2. A device according to claim 1, characterized in that said slider (108) comprises at its periphery a first annular central cavity (130) communicating with said central groove (120) and making communicate said fluid under pressure source with one or the other of said utilisation grooves (122, 123), a second annular cavity (131), which is able to make communicate one of said terminal grooves (126) with one of said utilisation grooves (123), and a third annular cavity (132) being able to make communicate the other of the terminal grooves (127) with the other of said utilisation grooves (122), the first channel (133) ending in the first cavity (130) and the second channel (135) ending in the second cavity (131).
3. A device according to claim 2, characterized in that said first annular central cavity (130) is connected via a third channel (134) to said second chamber (118) defined by said second bore (116).
4. A device according to one of claims 1 to 3, characterized in that the ratio of the cross-sections of the said first (109) and second bores (116) of the slider (108) is essentially equal to 2.
5. A device according to one of claims 1 to 4, characterized in that said cap (102) comprises a hollow serving as a housing for a spring (140) and a pin (142) cooperating for centering said slider (108) with respect to said lining (104).
6. A device according to one of claims 1 to 5, characterized in that the motor (10,113) is a step- by-step motor or a DC motor associated to a coder.
EP19830400385 1982-02-26 1983-02-25 Hydraulic directional spool valve Expired EP0088017B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8203239 1982-02-26
FR8203239 1982-02-26
FR8205928 1982-04-06
FR8205928 1982-04-06

Publications (3)

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EP0088017A2 EP0088017A2 (en) 1983-09-07
EP0088017A3 EP0088017A3 (en) 1984-04-04
EP0088017B1 true EP0088017B1 (en) 1987-11-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830400385 Expired EP0088017B1 (en) 1982-02-26 1983-02-25 Hydraulic directional spool valve

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Country Link
EP (1) EP0088017B1 (en)
DE (1) DE3374578D1 (en)

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CN101563542B (en) * 2006-12-22 2012-11-28 卡特彼勒公司 Rotary-actuated electro-hydraulic valve

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EP0117209A1 (en) * 1983-02-17 1984-08-29 COMPAGNIE PARISIENNE D'OUTILLAGE A AIR COMPRIME Société anonyme dite: Servo flow regulator
FR2547664B1 (en) * 1983-06-17 1986-04-18 Outillage Air Comprime FLOW SERVO REGULATOR
EP0117208A1 (en) * 1983-02-17 1984-08-29 COMPAGNIE PARISIENNE D'OUTILLAGE A AIR COMPRIME Société anonyme dite: Hydraulic pressure servolimiter
DE3313317A1 (en) * 1983-04-13 1984-10-18 Integral Hydraulik & Co, 4000 Düsseldorf Electro-hydraulic two-stage proportional directional control valve
DE3339578A1 (en) * 1983-11-02 1985-05-09 Volkswagenwerk Ag, 3180 Wolfsburg Device for compression control
US4907492A (en) * 1987-06-16 1990-03-13 Sig Schweizerische Industrie-Gesellschaft Apertured valve disposed in hollow piston rod of follower-type motor
DE4007648A1 (en) * 1990-03-10 1991-09-12 Friedhelm Dr Ing Schnuerle PNEUMATIC OR HYDRAULIC PISTON-CYLINDER UNIT WITH SERVO CONTROL
AU3770293A (en) * 1992-03-23 1993-10-21 Cwf Hamilton & Co Limited Hydraulic cylinder feedback control
DE19537417C2 (en) * 1995-10-07 1997-07-24 Eurocopter Deutschland Hydraulic actuator
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CN101563542B (en) * 2006-12-22 2012-11-28 卡特彼勒公司 Rotary-actuated electro-hydraulic valve

Also Published As

Publication number Publication date
EP0088017A2 (en) 1983-09-07
DE3374578D1 (en) 1987-12-23
EP0088017A3 (en) 1984-04-04

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