EP0528718A1 - Reciprocating hydraulic motor - Google Patents

Reciprocating hydraulic motor Download PDF

Info

Publication number
EP0528718A1
EP0528718A1 EP92402240A EP92402240A EP0528718A1 EP 0528718 A1 EP0528718 A1 EP 0528718A1 EP 92402240 A EP92402240 A EP 92402240A EP 92402240 A EP92402240 A EP 92402240A EP 0528718 A1 EP0528718 A1 EP 0528718A1
Authority
EP
European Patent Office
Prior art keywords
chamber
pistons
piston
exhaust
inlet
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.)
Withdrawn
Application number
EP92402240A
Other languages
German (de)
French (fr)
Inventor
Philippe Cloup
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0528718A1 publication Critical patent/EP0528718A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/1035—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber the movement of the pump piston in the two directions being obtained by two single-acting liquid motors each acting in one direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L23/00—Valves controlled by impact by piston, e.g. in free-piston machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/03—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with movement in two directions being obtained by two single-acting piston liquid engines, each acting in one direction
    • F03C1/035—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with movement in two directions being obtained by two single-acting piston liquid engines, each acting in one direction one single-acting piston being always under the influence of the liquid under pressure

Definitions

  • the present invention relates to a reciprocating hydraulic motor disposed between a fluid inlet pipe at a pressure P1 and a fluid exhaust pipe at a pressure P2 lower than P1.
  • Differential hydraulic motors which use pistons of different cross section slidably mounted in a stepped cylinder and various mechanisms for putting in communication the different chambers delimited by the pistons and the stepped cylinder.
  • energy is drawn from the main fluid, as a direct function of the flow of fluid passing through the engine, and of the pressure difference between the inlet and its exhaust.
  • These motors generally have pistons whose surface area is usually 1 to 2. They are mainly used to drive external pumps for secondary fluid and in particular metering devices.
  • the object of the present invention is to propose a different alternative hydraulic motor.
  • the alternative hydraulic motor proposed comprises: a movable coupling having first and second pistons linked together by a piston rod, first and second cylinder bodies placed end to end and in the respective bores from which said first and second pistons can slide in leaktight manner, said piston rod sliding in leaktight manner in an orifice formed in a wall common to said cylinder bodies, said first piston sharing the bore of said first cylinder body in an inlet chamber into which opens said fluid inlet pipe at pressure P1, and in a first intermediate chamber, said second piston sharing the bore of said second body cylinder into an exhaust chamber in which opens the fluid exhaust duct at pressure P2 and into a second intermediate chamber, means for permanently communicating said first intermediate chamber with said second intermediate chamber, and means for alternating said inlet chamber and said exhaust chamber in communication with said intermediate chambers.
  • Said inlet chamber and said exhaust chamber are situated on the same side with respect to their respective piston.
  • the sections of the two pistons of the movable coupling have substantially equal dimensions.
  • the purpose of the particular distribution of the main fluid is, in each direction of movement, to cancel the effect of one of the two pistons, and to use the pressure difference between the faces of the other piston to cause the displacement of this one.
  • the means for alternating between said inlet chamber and said exhaust chamber in communication with said intermediate chambers comprise a three-way distributor mounted in the wall common to said cylinder bodies and means for actuating said distributor.
  • Pipes connecting the inlet conduit and the exhaust conduit with said distributor are formed in said common wall.
  • said distributor comprises a sleeve mounted to slide and seal in a cavity formed in said common wall, said cavity being coaxial with said piston rod and opening into the intermediate chamber adjacent to said common wall.
  • the means for actuating said dispenser comprise trigger rods carried by said sleeve and capable of cooperating with the internal walls of said pistons.
  • said motor is intended to actuate a metering pump of the type comprising a pump piston slidably mounted in a metering chamber
  • said metering chamber is advantageously formed by a bore formed in said piston rod and passing through one pistons of said movable coupling, and the pump piston is disposed in said bore and is fixed relative to said cylinder bodies.
  • the drawing shows an alternative hydraulic motor 1 comprising two coaxial cylinder bodies 2 and 3, placed end to end and linked by a common wall 4.
  • first piston 6 In the bore 5 of the first cylinder body 2 is slidably mounted a first piston 6 sharing the bore 5 in an inlet chamber 7 located between the piston 6 and the end wall 8 of the cylinder body 2 and in a first intermediate chamber 9 located between the piston 6 and the common wall 4.
  • a second piston 11 sharing the bore 10 in an exhaust chamber 12 located between the piston 11 and the common wall 4 and in a second intermediate chamber 13 located between the piston 11 and the end wall 14.
  • Seals 14a, 14b are mounted on the pistons 6 and 11.
  • the pistons 6 and 11 are linked together by means of a piston rod 15 which slides in an orifice 16 provided in the common wall 4 with interposition of a seal 17.
  • the inlet chamber 7 communicates permanently with an inlet conduit 18 of fluid at pressure P1.
  • the exhaust chamber 12 is in permanent communication with an exhaust duct 19 for fluid at a pressure P2 lower than P1.
  • the intermediate chamber 9 and the second intermediate chamber 13 are placed in permanent communication by a conduit 20, and are always at the same pressure.
  • the inlet chamber 7 and the exhaust chamber 12 are alternately placed in communication with the intermediate chambers 9 and 13 by means 21 described below.
  • the conduit 20 which connects the intermediate chambers 9 and 13 is arranged in the piston rod 15 and in the piston 11. It opens into the intermediate chamber 9 by a first orifice 22 and in the intermediate chamber 13 by a second orifice 23.
  • the conduit 20 also passes through the piston 6.
  • the means 21, making it possible to alternate between the inlet chamber 7 and the exhaust chamber with the intermediate chambers 9 and 13, comprise a trigger rod 24 and valves 25 and 26.
  • the trigger rod 24 is slidably mounted in the duct 20.
  • the end of the trigger rod 24 which is located in the inlet chamber 7 has a valve 25 capable of cooperating with a valve seat 27 formed at the mouth of the conduit 20.
  • the other end of the trigger rod 24 is provided with a rod 28 supporting at least one valve 26 capable of cooperating with a valve seat 29 provided in the wall of the piston 11 at the mouth of a conduit 30 connecting the exhaust chamber 12 and the second intermediate chamber 13.
  • the diameter of the trigger rod 24 is less than the diameter of the conduit 20, so that the intermediate chambers communicate with each other permanently.
  • Figure 1 shows the engine 1 when the movable coupling moves to the right (arrow D); the valve 25 is closed and the valves 26 are open.
  • the inlet chamber 7 is always at pressure P1.
  • the exhaust chamber 12 is always at pressure P2.
  • the intermediate chambers 9 and 13 communicate with the exhaust chamber 12 via the orifice 22, the conduit 20, the orifice 23 and the orifices 30.
  • the pressure difference P1-P2 which is exerted on the two faces of the piston 6 causes the movable coupling to move to the right, and a discharge of fluid towards the exhaust duct 19.
  • the conduit 20 is formed in the common wall 4.
  • the conduit 20 communicates the first intermediate chamber 9 with a first annular chamber 31 surrounding the second cylinder body 3 and communicating with the second bedroom intermediate 13.
  • a second annular chamber 32 communicating with the inlet chamber 7 also surrounds the first cylinder body 2.
  • the inlet 18 and exhaust 19 conduits are connected to the common wall 4.
  • This common wall has a cavity 33 coaxial with the piston rod 15 and opening into the first intermediate chamber 9.
  • a sleeve 34 is slidably and sealingly mounted in the cavity 33.
  • This sleeve 34 is provided with axial trigger rods 35a and 35b capable of cooperating respectively with the internal faces of the pistons 6 and 11 for axially displacing the sleeve 34.
  • the sleeve 34 has in its wall distribution passages 36 capable of coming opposite annular cavities 37a and 37b surrounding the sleeve 34 and communicating respectively with the conduits inlet 18 and exhaust 19.
  • the sleeve 34 forms with the cavities 37a and 37b and the cavity 33 a three-way distributor.
  • FIGs 3 and 4 show a metering device 40 driven by the motor 1.
  • This metering device 40 consists of a three-way valve 41, a pump piston 42 and a metering chamber 43.
  • the metering chamber 43 of variable volume is formed by a bore 44 formed in the piston rod 15 and passing through the piston 6.
  • the pump piston 42 is fixed.
  • a conduit 46 is formed in the pump piston 42 and its rod 47 to put the metering chamber 43 into communication with the three-way valve 41.
  • the movement to the left of the movable coupling constituted by two pistons 6 and 11 and the piston rod 15 (arrow G in FIG. 3), causes the metering chamber 43 to be filled with a dose of additional product drawn into the bottle 48.
  • the displacement of the movable coupling to the right causes the evacuation of the dose of additional product contained in the metering chamber 43 to the discharge conduit 49 of the dose of additional product.
  • FIG 3 shows the engine when the movable hitch moves to the left.
  • the sleeve 34 is positioned to the right of the common wall 4, the trigger rod 35a is located in the first intermediate chamber 9.
  • the annular cavity 37b is in communication with the cavity 33.
  • the intermediate chambers 9 and 13 are therefore at pressure P2.
  • the exhaust chamber 12 is at pressure P2.
  • the inlet chamber 7 is alone at the pressure P1.
  • a force is exerted on the piston 6 which moves the movable coupling to the left.
  • the internal face of the piston 6 abuts on the trigger rod 35a, which causes the displacement of the sleeve 34 to the left.
  • the cavity 37b is insulated.
  • the cavity 37a is in communication with the cavity 33 via the distribution passage 36.
  • the intermediate chambers 9 and 13 are at pressure P1.
  • the trigger rod 35b is located in the exhaust chamber 12. A pressure result is exerted on the piston 11 which displaces the movable coupling to the right (arrow D in FIG. 4). Finally the internal face of the piston 11 abuts on the trigger rod 35b, which causes the displacement of the sleeve 34 to the right, and a reversal of the movement of the engine.

Abstract

The present invention relates to a reciprocating hydraulic motor interposed between a fluid inlet duct (18) at a pressure P1 and a fluid outlet duct (19) at a pressure P2. This motor comprises two identical pistons (6, 11) connected by a piston rod (15) and mounted so as to slide in two cylinders (2, 3) arranged end-to-end. The inlet chamber (7) communicating with the inlet duct (18), and the outlet chamber (12) communicating with the outlet duct (19), are located on the same side with respect to each of the pistons (6, 11). The intermediate chambers (9, 13) permanently communicate with each other, and they communicate alternately with the inlet chamber (7) and the outlet chamber (12) by means of a distribution device (34) actuated by the displacement of the pistons (6, 11). <IMAGE>

Description

La présente invention concerne un moteur hydraulique alternatif disposé entre une conduite d'arrivée de fluide à une pression P1 et un conduit d'échappement de fluide à une pression P2 inférieure à P1.The present invention relates to a reciprocating hydraulic motor disposed between a fluid inlet pipe at a pressure P1 and a fluid exhaust pipe at a pressure P2 lower than P1.

On connaît des moteurs hydrauliques différentiels qui utilisent des pistons de section différente montés coulissants dans un cylindre étagé et des mécanismes divers pour mettre en communication les différentes chambres délimitées par les pistons et le cylindre étagé. Lors du fonctionnement de ces moteurs, l'énergie est puisée sur le fluide principal, en fonction directe du débit de fluide traversant le moteur, et de la différence de pression entre l'arrivée et son échappement.Differential hydraulic motors are known which use pistons of different cross section slidably mounted in a stepped cylinder and various mechanisms for putting in communication the different chambers delimited by the pistons and the stepped cylinder. During the operation of these engines, energy is drawn from the main fluid, as a direct function of the flow of fluid passing through the engine, and of the pressure difference between the inlet and its exhaust.

Ces moteurs possèdent en général des pistons dont le rapport de surface est habituellement de 1 à 2. Ils sont essentiellement utilisés pour entraîner des pompes extérieures pour fluide secondaire et notamment des dispositifs de dosage.These motors generally have pistons whose surface area is usually 1 to 2. They are mainly used to drive external pumps for secondary fluid and in particular metering devices.

Le but de la présente invention est de proposer un moteur hydraulique alternatif différent.The object of the present invention is to propose a different alternative hydraulic motor.

Le but est atteint par le fait que le moteur hydraulique alternatif proposé comporte :
   un attelage mobile présentant un premier et un deuxième pistons liés entre eux par une tige de piston,
   un premier et un deuxième corps de cylindre disposés bout à bout et dans les alésages respectifs desquels lesdits premier et deuxième pistons peuvent coulisser de manière étanche, ladite tige de piston coulissant de manière étanche dans un orifice ménagé dans une paroi commune auxdits corps de cylindre, ledit premier piston partageant l'alésage dudit premier corps de cylindre en une chambre d'arrivée dans laquelle débouche ledit conduit d'arrivée de fluide à la pression P1, et en une première chambre intermédiaire, ledit deuxième piston partageant l'alésage dudit deuxième corps de cylindre en une chambre d'échappement dans laquelle débouche le conduit d'échappement de fluide à la pression P2 et en une deuxième chambre intermédiaire,
   des moyens pour mettre en communication permanente ladite première chambre intermédiaire avec ladite deuxième chambre intermédiaire, et
   des moyens pour mettre ladite chambre d'arrivée et ladite chambre d'échappement en alternance en communication avec lesdites chambres intermédiaires.The aim is achieved by the fact that the alternative hydraulic motor proposed comprises:
a movable coupling having first and second pistons linked together by a piston rod,
first and second cylinder bodies placed end to end and in the respective bores from which said first and second pistons can slide in leaktight manner, said piston rod sliding in leaktight manner in an orifice formed in a wall common to said cylinder bodies, said first piston sharing the bore of said first cylinder body in an inlet chamber into which opens said fluid inlet pipe at pressure P1, and in a first intermediate chamber, said second piston sharing the bore of said second body cylinder into an exhaust chamber in which opens the fluid exhaust duct at pressure P2 and into a second intermediate chamber,
means for permanently communicating said first intermediate chamber with said second intermediate chamber, and
means for alternating said inlet chamber and said exhaust chamber in communication with said intermediate chambers.

Ladite chambre d'arrivée et ladite chambre d'échappement sont situées d'un même côté par rapport à leur piston respectif.Said inlet chamber and said exhaust chamber are situated on the same side with respect to their respective piston.

Grâce à cette structure il s'établit en alternance une différence de pression sur les faces opposées de l'un des pistons ce qui permet le déplacement alternatif dudit attelage mobile par rapport aux corps de cylindre.Thanks to this structure, a pressure difference is established alternately on the opposite faces of one of the pistons, which allows said movable coupling to move alternately relative to the cylinder bodies.

Avantageusement, les sections des deux pistons de l'attelage mobile ont des dimensions sensiblement égales.Advantageously, the sections of the two pistons of the movable coupling have substantially equal dimensions.

La distribution particulière du fluide principal a pour but, dans chaque sens du mouvement, d'annuler l'effet d'un des deux pistons, et d'utiliser la différence de pression entre les faces de l'autre piston pour provoquer le déplacement de celui-ci.The purpose of the particular distribution of the main fluid is, in each direction of movement, to cancel the effect of one of the two pistons, and to use the pressure difference between the faces of the other piston to cause the displacement of this one.

Avantageusement, les moyens pour mettre ladite chambre d'arrivée et ladite chambre d'échappement en alternance en communication avec lesdites chambres intermédiaires comportent un distributeur à trois voies monté dans la paroi commune auxdits corps de cylindre et des moyens pour actionner ledit distributeur.Advantageously, the means for alternating between said inlet chamber and said exhaust chamber in communication with said intermediate chambers comprise a three-way distributor mounted in the wall common to said cylinder bodies and means for actuating said distributor.

Des canalisations mettant en communication le conduit d'arrivée et le conduit d'échappement avec ledit distributeur sont ménagées dans ladite paroi commune.Pipes connecting the inlet conduit and the exhaust conduit with said distributor are formed in said common wall.

De préférence, ledit distributeur comporte un manchon monté coulissant et étanche dans une cavité ménagée dans ladite paroi commune, ladite cavité étant coaxiale à ladite tige de piston et débouchant dans la chambre intermédiaire adjacente à ladite paroi commune.Preferably, said distributor comprises a sleeve mounted to slide and seal in a cavity formed in said common wall, said cavity being coaxial with said piston rod and opening into the intermediate chamber adjacent to said common wall.

Avantageusement, les moyens pour actionner ledit distributeur comportent des tiges de déclenchement portées par ledit manchon et susceptibles de coopérer avec les parois internes desdits pistons.Advantageously, the means for actuating said dispenser comprise trigger rods carried by said sleeve and capable of cooperating with the internal walls of said pistons.

Dans le cas où le moteur est destiné à actionner une pompe de dosage du type comportant un piston de pompe monté coulissant dans une chambre de dosage, ladite chambre de dosage est avantageusement formée par un alésage ménagé dans ladite tige de piston et traversant l'un des pistons dudit attelage mobile, et le piston de pompe est disposé dans ledit alésage et est fixe par rapport auxdits corps de cylindre.In the case where the motor is intended to actuate a metering pump of the type comprising a pump piston slidably mounted in a metering chamber, said metering chamber is advantageously formed by a bore formed in said piston rod and passing through one pistons of said movable coupling, and the pump piston is disposed in said bore and is fixed relative to said cylinder bodies.

D'autres avantages et caractéristiques de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence au dessin annexé dans lequel :

  • la figure 1 représente en coupe un premier mode de réalisation d'un moteur hydraulique alternatif selon l'invention, lors du déplacement de l'attelage mobile vers la droite de la figure,
  • la figure 2 représente en coupe le moteur hydraulique alternatif de la figure 1, lors du déplacement de l'attelage mobile vers la gauche,
  • la figure 3 est une coupe d'un deuxième mode de réalisation de l'invention, représentant le moteur pendant le déplacement de l'attelage mobile vers la gauche, et
  • la figure 4 représente le moteur de la figure 3 pendant le déplacement de l'attelage mobile vers la droite.
Other advantages and characteristics of the invention will emerge on reading the following description given by way of example and with reference to the appended drawing in which:
  • FIG. 1 represents in section a first embodiment of an alternative hydraulic motor according to the invention, when the movable coupling is moved to the right of the figure,
  • FIG. 2 represents in section the alternative hydraulic motor of FIG. 1, when the movable coupling is moved to the left,
  • FIG. 3 is a section through a second embodiment of the invention, showing the motor during the movement of the movable coupling to the left, and
  • Figure 4 shows the motor of Figure 3 during the movement of the movable coupling to the right.

Le dessin montre un moteur hydraulique alternatif 1 comportant deux corps de cylindre 2 et 3 coaxiaux, disposés bout à bout et liés par une paroi commune 4.The drawing shows an alternative hydraulic motor 1 comprising two coaxial cylinder bodies 2 and 3, placed end to end and linked by a common wall 4.

Dans l'alésage 5 du premier corps de cylindre 2 est monté coulissant un premier piston 6 partageant l'alésage 5 en une chambre d'arrivée 7 située entre le piston 6 et la paroi d'extrémité 8 du corps de cylindre 2 et en une première chambre intermédiaire 9 située entre le piston 6 et la paroi commune 4.In the bore 5 of the first cylinder body 2 is slidably mounted a first piston 6 sharing the bore 5 in an inlet chamber 7 located between the piston 6 and the end wall 8 of the cylinder body 2 and in a first intermediate chamber 9 located between the piston 6 and the common wall 4.

De la même manière, dans l'alésage 10 du deuxième corps de cylindre 3 est monté coulissant un deuxième piston 11 partageant l'alésage 10 en une chambre d'échappement 12 située entre le piston 11 et la paroi commune 4 et en une deuxième chambre intermédiaire 13 située entre le piston 11 et la paroi d'extrémité 14.Similarly, in the bore 10 of the second cylinder body 3 is slidably mounted a second piston 11 sharing the bore 10 in an exhaust chamber 12 located between the piston 11 and the common wall 4 and in a second intermediate chamber 13 located between the piston 11 and the end wall 14.

Des joints d'étanchéité 14a, 14b sont montés sur les pistons 6 et 11. Les pistons 6 et 11 sont liés entre eux par l'intermédiaire d'une tige de piston 15 qui coulisse dans un orifice 16 prévu dans la paroi commune 4 avec interposition d'un joint d'étanchéité 17.Seals 14a, 14b are mounted on the pistons 6 and 11. The pistons 6 and 11 are linked together by means of a piston rod 15 which slides in an orifice 16 provided in the common wall 4 with interposition of a seal 17.

La chambre d'arrivée 7 communique en permanence avec un conduit d'arrivée 18 de fluide à la pression P1. La chambre d'échappement 12 est en communication permanente avec un conduit d'échappement 19 de fluide à une pression P2 inférieure à P1.The inlet chamber 7 communicates permanently with an inlet conduit 18 of fluid at pressure P1. The exhaust chamber 12 is in permanent communication with an exhaust duct 19 for fluid at a pressure P2 lower than P1.

La chambre intermédiaire 9 et la deuxième chambre intermédiaire 13 sont mises en communication permanente par un conduit 20, et sont toujours à la même pression.The intermediate chamber 9 and the second intermediate chamber 13 are placed in permanent communication by a conduit 20, and are always at the same pressure.

La chambre d'arrivée 7 et la chambre d'échappement 12 sont mises en alternance en communication avec les chambres intermédiaires 9 et 13 par des moyens 21 décrits plus loin.The inlet chamber 7 and the exhaust chamber 12 are alternately placed in communication with the intermediate chambers 9 and 13 by means 21 described below.

Dans le mode de réalisation représenté sur les figures 1 et 2, le conduit 20 qui met en communication les chambres intermédiaires 9 et 13 est aménagé dans la tige de piston 15 et dans le piston 11. Il débouche dans la chambre intermédiaire 9 par un premier orifice 22 et dans la chambre intermédiaire 13 par un deuxième orifice 23. Le conduit 20 traverse également le piston 6. Les moyens 21, permettant de mettre en alternance en communication la chambre d'arrivée 7 et la chambre d'échappement avec les chambres intermédiaires 9 et 13, comportent une tige de déclenchement 24 et des soupapes 25 et 26. La tige de déclenchement 24 est montée coulissante dans le conduit 20. Elle a une longueur supérieure à la longueur de l'attelage mobile constitué par les deux pistons 6 et 11 et la tige de piston 15 de telle manière qu'elle puisse venir en butée sur les parois d'extrémité 8 et 14, ce qui provoque son déplacement par rapport à l'attelage mobile. L'extrémité de la tige de déclenchement 24 qui est située dans la chambre d'arrivée 7 comporte une soupape 25 susceptible de coopérer avec un siège de soupape 27 formé à l'embouchure du conduit 20. L'autre extrémité de la tige de déclenchement 24 est munie d'une tige 28 supportant au moins une soupape 26 susceptible de coopérer avec un siège de soupape 29 prévu dans la paroi du piston 11 à l'embouchure d'un conduit 30 mettant en communication la chambre d'échappement 12 et la deuxième chambre intermédiaire 13. Le diamètre de la tige de déclenchement 24 est inférieur au diamètre du conduit 20, pour que les chambres intermédiaires communiquent entre elles en permanence.In the embodiment shown in Figures 1 and 2, the conduit 20 which connects the intermediate chambers 9 and 13 is arranged in the piston rod 15 and in the piston 11. It opens into the intermediate chamber 9 by a first orifice 22 and in the intermediate chamber 13 by a second orifice 23. The conduit 20 also passes through the piston 6. The means 21, making it possible to alternate between the inlet chamber 7 and the exhaust chamber with the intermediate chambers 9 and 13, comprise a trigger rod 24 and valves 25 and 26. The trigger rod 24 is slidably mounted in the duct 20. It has a length greater than the length of the movable coupling formed by the two pistons 6 and 11 and the piston rod 15 in such a way that it can come into abutment on the end walls 8 and 14, which causes it to move relative to the movable coupling. The end of the trigger rod 24 which is located in the inlet chamber 7 has a valve 25 capable of cooperating with a valve seat 27 formed at the mouth of the conduit 20. The other end of the trigger rod 24 is provided with a rod 28 supporting at least one valve 26 capable of cooperating with a valve seat 29 provided in the wall of the piston 11 at the mouth of a conduit 30 connecting the exhaust chamber 12 and the second intermediate chamber 13. The diameter of the trigger rod 24 is less than the diameter of the conduit 20, so that the intermediate chambers communicate with each other permanently.

La figure 1 montre le moteur 1 lorsque l'attelage mobile se déplace vers la droite (flèche D) ; la soupape 25 est fermée et les soupapes 26 sont ouvertes. La chambre d'arrivée 7 est toujours à la pression P1. La chambre d'échappement 12 est toujours à la pression P2. Les chambres intermédiaires 9 et 13 communiquent avec la chambre d'échappement 12 par l'intermédiaire de l'orifice 22, du conduit 20, de l'orifice 23 et des orifices 30. L'écart de pression P1-P2 qui s'exerce sur les deux faces du piston 6 provoque le déplacement de l'attelage mobile vers la droite, et une évacuation de fluide vers le conduit d'échappement 19.Figure 1 shows the engine 1 when the movable coupling moves to the right (arrow D); the valve 25 is closed and the valves 26 are open. The inlet chamber 7 is always at pressure P1. The exhaust chamber 12 is always at pressure P2. The intermediate chambers 9 and 13 communicate with the exhaust chamber 12 via the orifice 22, the conduit 20, the orifice 23 and the orifices 30. The pressure difference P1-P2 which is exerted on the two faces of the piston 6 causes the movable coupling to move to the right, and a discharge of fluid towards the exhaust duct 19.

Finalement, la tige de déclenchement 24 vient en butée sur la paroi d'extrémité 14. La soupape 25 s'ouvre et les soupapes 26 se ferment (voir figure 2). Les chambres intermédiaires 9 et 13 communiquent maintenant avec la chambre d'arrivée 7 par l'intermédiaire du conduit 20 et sont à la pression P1. L'écart de pression P2-P1 qui s'exerce sur le piston 11 provoque le déplacement de l'attelage mobile vers la gauche (flèche G). Lorsque l'extrémité de la tige de déclenchement 24 vient en butée sur la paroi d'extrémité 8, la soupape 25 se ferme de nouveau et les soupapes 26 s'ouvrent.Finally, the trigger rod 24 abuts on the end wall 14. The valve 25 opens and the valves 26 close (see FIG. 2). The intermediate chambers 9 and 13 now communicate with the inlet chamber 7 via the conduit 20 and are at pressure P1. The pressure difference P2-P1 which is exerted on the piston 11 causes the displacement of the movable coupling to the left (arrow G). When the end of the trigger rod 24 abuts on the end wall 8, the valve 25 closes again and the valves 26 open.

Dans le mode de réalisation représenté sur les figures 3 et 4, le conduit 20 est ménagé dans la paroi commune 4. Le conduit 20 met en communication la première chambre intermédiaire 9 avec une première chambre annulaire 31 entourant le deuxième corps de cylindre 3 et communiquant avec la deuxième chambre intermédiaire 13. Une deuxième chambre annulaire 32 communiquant avec la chambre d'arrivée 7 entoure également le premier corps de cylindre 2. Les conduits d'arrivée 18 et d'échappement 19 sont raccordés à la paroi commune 4. Cette paroi commune présente une cavité 33 coaxiale à la tige de piston 15 et débouchant dans la première chambre intermédiaire 9. Un manchon 34 est monté de manière coulissante et étanche dans la cavité 33. Ce manchon 34 est muni de tiges de déclenchement axiales 35a et 35b susceptibles de coopérer respectivement avec les faces internes des pistons 6 et 11 pour déplacer axialement le manchon 34. Le manchon 34 comporte dans sa paroi des passages de distribution 36 susceptibles de venir en regard de cavités annulaires 37a et 37b entourant le manchon 34 et communiquant respectivement avec les conduits d'arrivée 18 et d'échappement 19. Le manchon 34 forme avec les cavités 37a et 37b et la cavité 33 un distributeur à trois voies.In the embodiment shown in Figures 3 and 4, the conduit 20 is formed in the common wall 4. The conduit 20 communicates the first intermediate chamber 9 with a first annular chamber 31 surrounding the second cylinder body 3 and communicating with the second bedroom intermediate 13. A second annular chamber 32 communicating with the inlet chamber 7 also surrounds the first cylinder body 2. The inlet 18 and exhaust 19 conduits are connected to the common wall 4. This common wall has a cavity 33 coaxial with the piston rod 15 and opening into the first intermediate chamber 9. A sleeve 34 is slidably and sealingly mounted in the cavity 33. This sleeve 34 is provided with axial trigger rods 35a and 35b capable of cooperating respectively with the internal faces of the pistons 6 and 11 for axially displacing the sleeve 34. The sleeve 34 has in its wall distribution passages 36 capable of coming opposite annular cavities 37a and 37b surrounding the sleeve 34 and communicating respectively with the conduits inlet 18 and exhaust 19. The sleeve 34 forms with the cavities 37a and 37b and the cavity 33 a three-way distributor.

Les figures 3 et 4 montrent un dispositif de dosage 40 entraîné par le moteur 1. Ce dispositif de dosage 40 est constitué d'une vanne à trois voies 41, d'un piston de pompe 42 et d'une chambre de dosage 43. De façon avantageuse, la chambre de dosage 43 de volume variable est formée par un alésage 44 ménagé dans la tige de piston 15 et traversant le piston 6. Le piston de pompe 42 est fixe. Un conduit 46 est ménagé dans le piston de pompe 42 et sa tige 47 pour mettre en communication la chambre de dosage 43 avec la vanne à trois voies 41. Le déplacement vers la gauche de l'attelage mobile, constitué par deux pistons 6 et 11 et la tige de piston 15 (flèche G de la figure 3), entraîne le remplissage de la chambre de dosage 43 avec une dose de produit annexe aspirée dans le flacon 48. Le déplacement de l'attelage mobile vers la droite (flèche D de la figure 4) entraîne l'évacuation de la dose de produit annexe contenue dans la chambre de dosage 43 vers le conduit d'évacuation 49 de la dose de produit annexe.Figures 3 and 4 show a metering device 40 driven by the motor 1. This metering device 40 consists of a three-way valve 41, a pump piston 42 and a metering chamber 43. advantageously, the metering chamber 43 of variable volume is formed by a bore 44 formed in the piston rod 15 and passing through the piston 6. The pump piston 42 is fixed. A conduit 46 is formed in the pump piston 42 and its rod 47 to put the metering chamber 43 into communication with the three-way valve 41. The movement to the left of the movable coupling, constituted by two pistons 6 and 11 and the piston rod 15 (arrow G in FIG. 3), causes the metering chamber 43 to be filled with a dose of additional product drawn into the bottle 48. The displacement of the movable coupling to the right (arrow D of Figure 4) causes the evacuation of the dose of additional product contained in the metering chamber 43 to the discharge conduit 49 of the dose of additional product.

La figure 3 montre le moteur lorsque l'attelage mobile se déplace vers la gauche. Le manchon 34 est positionné à droite de la paroi commune 4, la tige de déclenchement 35a se trouve dans la première chambre intermédiaire 9. La cavité annulaire 37b est en communication avec la cavité 33. Les chambres intermédiaires 9 et 13 sont donc à la pression P2. La chambre d'échappement 12 est à la pression P2. La chambre d'arrivée 7 est seule à la pression P1. Il s'exerce sur le piston 6 une force qui déplace l'attelage mobile vers la gauche. Finalement, la face interne du piston 6 vient buter sur la tige de déclenchement 35a, ce qui provoque le déplacement du manchon 34 vers la gauche. La cavité 37b est isolée. La cavité 37a est en communication avec la cavité 33 par l'intermédiaire du passage de distribution 36. Les chambres intermédiaires 9 et 13 sont à la pression P1. La tige de déclenchement 35b se trouve dans la chambre d'échappement 12. Il s'exerce sur le piston 11 une résultante de pression qui déplace l'attelage mobile vers la droite (flèche D de la figure 4). Enfin la face interne du piston 11 vient buter sur la tige de déclenchement 35b, ce qui entraîne le déplacement du manchon 34 vers la droite, et un renversement du mouvement du moteur.Figure 3 shows the engine when the movable hitch moves to the left. The sleeve 34 is positioned to the right of the common wall 4, the trigger rod 35a is located in the first intermediate chamber 9. The annular cavity 37b is in communication with the cavity 33. The intermediate chambers 9 and 13 are therefore at pressure P2. The exhaust chamber 12 is at pressure P2. The inlet chamber 7 is alone at the pressure P1. A force is exerted on the piston 6 which moves the movable coupling to the left. Finally, the internal face of the piston 6 abuts on the trigger rod 35a, which causes the displacement of the sleeve 34 to the left. The cavity 37b is insulated. The cavity 37a is in communication with the cavity 33 via the distribution passage 36. The intermediate chambers 9 and 13 are at pressure P1. The trigger rod 35b is located in the exhaust chamber 12. A pressure result is exerted on the piston 11 which displaces the movable coupling to the right (arrow D in FIG. 4). Finally the internal face of the piston 11 abuts on the trigger rod 35b, which causes the displacement of the sleeve 34 to the right, and a reversal of the movement of the engine.

Diverses modifications peuvent être apportées aux modes de réalisation décrits ci-dessus sans sortir du cadre de la présente invention. On peut notamment ajouter des dispositifs supplémentaires qui favorisent un déplacement franc et rapide des moyens 21 lorsque l'attelage mobile est en bout de course, tels que des ressorts agissant aux extrémités des tiges de déclenchement 24, 35a et 35b.Various modifications can be made to the embodiments described above without departing from the scope of the present invention. One can in particular add additional devices which promote a frank and rapid movement of the means 21 when the movable coupling is at the end of its travel, such as springs acting at the ends of the trigger rods 24, 35a and 35b.

Claims (9)

Moteur hydraulique alternatif disposé entre une conduite d'arrivée de fluide (18) à une pression P1 et un conduit d'échappement de fluide (19) à une pression P2 inférieure à P1, caractérisé en ce qu'il comporte :
   un attelage mobile présentant un premier et un deuxième pistons (6, 11) liés entre eux par une tige de piston (15),
   un premier et un deuxième corps de cylindre (2, 3) disposés bout à bout et dans les alésages respectifs (5, 10) desquels lesdits premier et deuxième pistons (6, 11) peuvent coulisser de manière étanche, ladite tige de piston (15) coulissant de manière étanche dans un orifice (16) ménagé dans une paroi commune (4) auxdits corps de cylindre (2, 3), ledit premier piston (6) partageant l'alésage (5) dudit premier corps de cylindre (2) en une chambre d'arrivée (7) dans laquelle débouche ledit conduit d'arrivée de fluide (18) à la pression P1, et en une première chambre intermédiaire (9), ledit deuxième piston (11) partageant l'alésage (10) dudit deuxième corps de cylindre (3) en une chambre d'échappement (12) dans laquelle débouche le conduit d'échappement de fluide (19) à la pression P2 et en une deuxième chambre intermédiaire (13),
   des moyens (20) pour mettre en communication permanente ladite première chambre intermédiaire (9) avec ladite deuxième chambre intermédiaire (13), et
   des moyens (21) pour mettre ladite chambre d'arrivée (7) et ladite chambre d'échappement (12) en alternance en communication avec lesdites chambres intermédiaires (9, 13), et en ce que ladite chambre d'arrivée (7) et ladite chambre d'échappement (12) sont situées d'un même côté par rapport à leur piston respectif (6, 11), grâce à quoi il s'établit en alternance une différence de pression sur les faces opposées de l'un des pistons (6, 11), ce qui permet le déplacement alternatif dudit attelage mobile par rapport aux corps de cylindre (2, 3).Reciprocating hydraulic motor disposed between a fluid inlet pipe (18) at a pressure P1 and a fluid exhaust pipe (19) at a pressure P2 lower than P1, characterized in that it comprises:
a movable coupling having first and second pistons (6, 11) linked together by a piston rod (15),
first and second cylinder bodies (2, 3) arranged end to end and in the respective bores (5, 10) from which said first and second pistons (6, 11) can slide in leaktight manner, said piston rod (15 ) sliding in leaktight manner in an orifice (16) formed in a wall common (4) to said cylinder bodies (2, 3), said first piston (6) sharing the bore (5) of said first cylinder body (2) in an inlet chamber (7) into which opens said fluid inlet conduit (18) at pressure P1, and in a first intermediate chamber (9), said second piston (11) sharing the bore (10) said second cylinder body (3) into an exhaust chamber (12) into which the fluid exhaust duct (19) opens at pressure P2 and into a second intermediate chamber (13),
means (20) for permanently communicating said first intermediate chamber (9) with said second intermediate chamber (13), and
means (21) for alternating said inlet chamber (7) and said exhaust chamber (12) in communication with said intermediate chambers (9, 13), and in that said inlet chamber (7) and said exhaust chamber (12) are located on the same side with respect to their respective piston (6, 11), whereby a pressure difference is established alternately on the opposite faces of one of the pistons (6, 11), which allows said movable coupling to move alternately relative to the cylinder bodies (2, 3). Moteur selon la revendication 1, caractérisé en ce que les moyens pour mettre en communication permanente ladite première chambre intermédiaire (9) avec ladite deuxième chambre intermédiaire (13) comportent un conduit (20) ménagé dans ladite tige de piston (15) et dans l'un au moins desdits pistons (11) et débouchant dans lesdites chambres intermédiaires (9, 13) par des orifices (22, 23).Motor according to claim 1, characterized in that the means for bringing said first intermediate chamber (9) into permanent communication with said second intermediate chamber (13) comprise a conduit (20) formed in said piston rod (15) and in the 'at least one of said pistons (11) and opening into said intermediate chambers (9, 13) through orifices (22, 23). Moteur selon la revendication 2, caractérisé en ce que ledit conduit (20) traverse lesdits deux pistons (6, 11), et, en ce que les moyens (21) pour mettre ladite chambre d'arrivée (7) et ladite chambre d'échappement en alternance en communication avec lesdites chambres intermédiaires (9, 13) comportent :
   une tige de déclenchement (24) montée coulissante dans ledit conduit (20), ladite tige de déclenchement (24) ayant une longueur supérieure à la longueur dudit attelage et étant susceptible de se déplacer par rapport audit attelage mobile lorsqu'elle vient en butée sur des parois (8, 14) desdits corps de cylindre (2, 3) par suite de déplacement alternatif dudit attelage mobile, et
   au moins deux soupapes (25, 26) portées par ladite tige de déclenchement (24) et susceptibles de coopérer alternativement avec des sièges de soupape (27, 29) prévus dans les parois desdits pistons (6, 11), lesdites soupapes (25, 26) étant disposées de telle manière que la soupape fermée coopère positivement avec son siège de soupape par suite de la différence des pressions exercées sur les deux faces du piston correspondant.Motor according to claim 2, characterized in that said duct (20) passes through said two pistons (6, 11), and, in that the means (21) for placing said inlet chamber (7) and said chamber alternating exhaust in communication with said intermediate chambers (9, 13) comprise:
a trigger rod (24) slidably mounted in said conduit (20), said trigger rod (24) having a length greater than the length of said hitch and being capable of moving relative to said movable hitch when it abuts on walls (8, 14) of said cylinder body (2, 3) as a result of reciprocating movement of said movable coupling, and
at least two valves (25, 26) carried by said trigger rod (24) and capable of cooperating alternately with valve seats (27, 29) provided in the walls of said pistons (6, 11), said valves (25, 26) being arranged in such a way that the closed valve cooperates positively with its valve seat as a result of the difference in pressures exerted on the two faces of the corresponding piston. Moteur selon la revendication 1, caractérisé en ce que les moyens (21) pour mettre ladite chambre d'arrivée (7) et ladite chambre d'échappement (12) en alternance en communication avec lesdites chambres (9, 13) intermédiaires comportent un distributeur (34) à trois voies monté dans la paroi commune (4) auxdits corps de cylindre (2, 3) et des moyens (35a, 35b) pour actionner ledit distributeur (34), et,
   en ce que des canalisations (37a, 37b) mettant en communication le conduit d'arrivée (18) et le conduit d'échappement (19) avec ledit distributeur (34) sont ménagées dans ladite paroi commune (4).Engine according to claim 1, characterized in that the means (21) for alternating said inlet chamber (7) and said exhaust chamber (12) in communication with said intermediate chambers (9, 13) comprise a distributor (34) three-way mounted in the wall common (4) to said cylinder bodies (2, 3) and means (35a, 35b) for actuating said distributor (34), and,
in that pipes (37a, 37b) connecting the inlet duct (18) and the duct exhaust (19) with said distributor (34) are formed in said common wall (4). Moteur selon la revendication 4, caractérisé en ce que ledit distributeur comporte un manchon (34) monté coulissant et étanche dans une cavité (33) ménagée dans ladite paroi commune (4), ladite cavité (33) étant coaxiale à ladite tige de piston (15) et débouchant dans la chambre intermédiaire (9) adjacente à ladite paroi commune (4).Motor according to claim 4, characterized in that said distributor comprises a sleeve (34) mounted to slide and seal in a cavity (33) formed in said common wall (4), said cavity (33) being coaxial with said piston rod ( 15) and opening into the intermediate chamber (9) adjacent to said common wall (4). Moteur selon la revendication 4, caractérisé en ce que les moyens pour actionner ledit distributeur comportent des tiges de déclenchement (35a, 35b) portées par ledit manchon (34) et susceptibles de coopérer avec les parois internes desdits pistons (6, 11).Motor according to claim 4, characterized in that the means for actuating said distributor comprise trigger rods (35a, 35b) carried by said sleeve (34) and capable of cooperating with the internal walls of said pistons (6, 11). Moteur selon l'une quelconque des revendications 4 à 6, destiné à actionner une pompe de dosage (40) du type comportant un piston de pompe (42) monté coulissant dans une chambre de dosage (43), caractérisé en ce que ladite chambre de dosage (43) est formée par un alésage (44) ménagé dans ladite tige de piston (15) et traversant l'un des pistons (6) dudit attelage mobile, et, en ce que le piston de pompe (42) est disposé dans ledit alésage (44) et est fixe par rapport auxdits corps de cylindre (2, 3).Motor according to any one of claims 4 to 6, intended to actuate a metering pump (40) of the type comprising a pump piston (42) slidably mounted in a metering chamber (43), characterized in that said metering (43) is formed by a bore (44) formed in said piston rod (15) and passing through one of the pistons (6) of said movable coupling, and, in that the pump piston (42) is arranged in said bore (44) and is fixed relative to said cylinder body (2, 3). Moteur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les sections des deux pistons (6, 11) de l'attelage mobile ont des dimensions sensiblement égales.Engine according to any one of claims 1 to 7, characterized in that the sections of the two pistons (6, 11) of the movable coupling have dimensions which are substantially equal. Moteur selon l'une quelconque des revendications 3 à 6, caractérisé en ce que les moyens (21) pour mettre ladite chambre d'arrivée (7) et ladite chambre d'échappement en alternance en communication avec lesdites chambres intermédiaires sont assités dans leur déplacement par des ressoits agissant aux extrémités des tiges de déclenchement (24, 35a, 35b), lesdits ressorts étant mis sous tension par l'attelage mobile sur une longueur au moins égale à la course complète desdits moyens (21) puis relachés par un dispositif à déclenchement brusque, mécanique ou magnétique.Engine according to any one of Claims 3 to 6, characterized in that the means (21) for alternating between said inlet chamber (7) and said exhaust chamber in communication with said intermediate chambers are assisted in their movement by springs acting at the ends of the trigger rods (24, 35a, 35b), said springs being tensioned by the movable coupling over a length at least equal to the full stroke of said means (21) and then released by a device to sudden, mechanical or magnetic release.
EP92402240A 1991-08-08 1992-08-06 Reciprocating hydraulic motor Withdrawn EP0528718A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110142A FR2680204B1 (en) 1991-08-08 1991-08-08 ALTERNATIVE HYDRAULIC MOTOR.
FR9110142 1991-08-08

Publications (1)

Publication Number Publication Date
EP0528718A1 true EP0528718A1 (en) 1993-02-24

Family

ID=9416069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402240A Withdrawn EP0528718A1 (en) 1991-08-08 1992-08-06 Reciprocating hydraulic motor

Country Status (2)

Country Link
EP (1) EP0528718A1 (en)
FR (1) FR2680204B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE258157C (en) *
US2370068A (en) * 1943-11-01 1945-02-20 Stewart Warner Corp Air motor for lubricating pumps
US3628419A (en) * 1969-08-21 1971-12-21 Doughton Mfg Co Inc Fluid-operated motor
FR2438740A1 (en) * 1978-10-13 1980-05-09 Mirkovic Radivoje Axial piston pneumatic motor - has distribution pipe passing through piston to cylinder head and regulator to control exhaust
WO1986007118A1 (en) * 1985-05-24 1986-12-04 Ethan Silva Fluid pressure intensifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE258157C (en) *
US2370068A (en) * 1943-11-01 1945-02-20 Stewart Warner Corp Air motor for lubricating pumps
US3628419A (en) * 1969-08-21 1971-12-21 Doughton Mfg Co Inc Fluid-operated motor
FR2438740A1 (en) * 1978-10-13 1980-05-09 Mirkovic Radivoje Axial piston pneumatic motor - has distribution pipe passing through piston to cylinder head and regulator to control exhaust
WO1986007118A1 (en) * 1985-05-24 1986-12-04 Ethan Silva Fluid pressure intensifier

Also Published As

Publication number Publication date
FR2680204B1 (en) 1993-11-19
FR2680204A1 (en) 1993-02-12

Similar Documents

Publication Publication Date Title
FR2802432A1 (en) AUTOMATIC SHUTTER CONNECTOR FOR CONNECTING A LIQUID INJECTION HEAD TO AN INJECTION OUTPUT
FR2763097A1 (en) DEVICE FOR CONTROLLING THE POSITION OF THE CONTROL RACK OF A VARIABLE CYLINDER MOTOR
FR2575792A1 (en) HYDRAULIC PRESSURE AMPLIFIER
FR2932539A1 (en) ELECTROHYDRAULIC ACTUATOR WITH INTEGRATED PUMP IN THE PISTON
EP0088017B1 (en) Hydraulic directional spool valve
FR2893379A1 (en) COAXIAL INTERCEPTION VALVE FOR USE IN COMPRESSED AIR FACILITIES
FR2830046A1 (en) Valve drive for internal combustion engine has common actuator cylinder for inlet and exhaust valves
EP0528718A1 (en) Reciprocating hydraulic motor
FR2720120A3 (en) Manual-pneumatic dual control oil pump
FR2731071A1 (en) DIFFERENTIAL PRESSURE INDICATOR
EP0969996B1 (en) Compact dual master cylinder with offset primary outlet
EP3163076B1 (en) Hydraulic machine with two displacements and safety valve
FR2711182A1 (en) Air distributor with low friction and anti-icing system.
FR2667908A1 (en) Pneumatic thrust cylinder with several stop positions
EP0306368B1 (en) Pressure compensator valve for a hydraulic proportional directional valve, and hydraulic directional valve comprising it
FR2611236A1 (en) HYDRAULIC PISTON WITH AXIAL PISTONS PROVIDED WITH VALVES ANTI RETURN RETURN HYDRAULICALLY CONTROLLED
EP0524104B1 (en) Hydraulic motor with reciprocating differential piston
FR2821387A1 (en) Device for introduction of fuel mixture into two-stroke engine combustion chamber comprises valve and element connected to valve delimiting upper and lower chambers, pressurized air supply and fluidic communication between chambers
EP0426772B1 (en) Self-reversing reciprocating piston pump with hydraulic transmission of the inversion signal
FR2553149A1 (en) Hydraulically or pneumatically actuated piston engine and applications
FR2526116A1 (en) Isolating valve for food processing plant - has valve seal leakage indicator with pneumatic shut=off valve actuator
FR2479918A1 (en) Linear actuator with variable force - uses differential piston heads to control force over most of travel
FR2740106A1 (en) DEVICE FOR CONTROLLING SPACEWISE ENGINE BY VANTING GAS BY MOBILE TUYERE
FR2641342A1 (en) FLUID ACTUATOR
FR2679964A1 (en) Reciprocating metering device for injecting a variable metered quantity of auxiliary product into a main fluid

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19931001