EP0086725A1 - Hydraulic-pressure generator - Google Patents

Hydraulic-pressure generator Download PDF

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Publication number
EP0086725A1
EP0086725A1 EP83400324A EP83400324A EP0086725A1 EP 0086725 A1 EP0086725 A1 EP 0086725A1 EP 83400324 A EP83400324 A EP 83400324A EP 83400324 A EP83400324 A EP 83400324A EP 0086725 A1 EP0086725 A1 EP 0086725A1
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EP
European Patent Office
Prior art keywords
piston
chamber
auxiliary piston
elastic return
return member
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.)
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Application number
EP83400324A
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German (de)
French (fr)
Inventor
Auguste Moiroux
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.)
Poclain Hydraulics France SA
Airmachines SA
Original Assignee
Poclain Hydraulics France SA
Airmachines SA
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Publication date
Application filed by Poclain Hydraulics France SA, Airmachines SA filed Critical Poclain Hydraulics France SA
Publication of EP0086725A1 publication Critical patent/EP0086725A1/en
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    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
    • 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
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/003—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 free-piston type pumps

Definitions

  • a generator of pressurized hydraulic fluid comprising an internal combustion engine of which a part of the free piston evolves in a combustion chamber, while a another part of said piston evolves in a mattress chamber.
  • a hydraulic pump, driven by said motor, comprises a piston subjected to the action of an elastic return member.
  • the present invention therefore relates to a hydraulic fluid generator of the aforementioned type, the structure and the regulation. are simplified and whose reliability and flexibility are consequently increased compared to the known technique.
  • the piston of the hydraulic pump is coupled to an auxiliary piston independent of the free piston of the engine and arranged in the mattress chamber, preferably facing the free piston of the engine and coaxially with it, while the elastic return member of the hydraulic pump piston acts on said auxiliary piston in the opposite direction to that of the pressure in the mattress chamber.
  • the generator comprises an internal combustion engine designated by the general reference 1 and a hydraulic pump designated by the general reference 2.
  • the engine 1 is preferably of the two-stroke Diesel type, described in the patent FR-A-81 05 770 already mentioned. It essentially comprises a monobloc mobile assembly 3 of which a first part constitutes the piston 4 of the engine operating in the combustion chamber 5 supplied with fuel by an injector 6. Opposite the combustion chamber, the monobloc mobile assembly 3 has a part 7 of diameter greater than that of the piston 4. This part 7 constitutes a piston evolving in a cylinder 8 formed in the body 9 of the engine. In the cylinder 8, the chamber 10, located on the side opposite to the combustion chamber 5, is sealed and is called, as is known, the mattress chamber.
  • the hydraulic pump 2 essentially comprises a cylindrical chamber 11 formed in a pump body 12 fixed to the body 9 of the motor, preferably by means of a part 13.
  • the piston 14 of the pump moves in the chamber 11 and is guided by a jacket 15 fixed in a bore 16 of the intermediate part 13.
  • Adjacent to the chamber 11 are provided, on the one hand, at least one suction valve 17 disposed inside a conduit 18 opening into the chamber and connected to a reservoir 19 of hydraulic fluid, shown schematically and located preferably above the valve 17, on the other hand, at least one discharge valve 20 disposed on the discharge line 21.
  • an accumulator 22 for example of the membrane type, intended to regulate, at least in part, the pulsating flow supplied by the pump.
  • the assembly of the pump 2 is preferably arranged, as shown in the figure, so that the chamber 11 and the piston 14 are coaxial with the motor, but this arrangement could be modified in certain particular cases.
  • the intermediate piece 13 also receives a cylindrical jacket 23 inside which can slide an auxiliary piston 24 for controlling the pump 2.
  • the head 14a of the piston 14 is coupled to the auxiliary piston 24 by a rod 25 fixed to the two aforementioned pistons.
  • the head 14a has a shoulder 14b capable of coming into abutment on the jacket 15 or even directly on the intermediate piece 13.
  • An elastic return member such as, for example, a spring 26 bears on the control piston 24 and on the intermediate piece 13, the head 14a of the piston 14 limiting the movement of the piston 24 under the action of said spring.
  • a compressible fluid such as air thereby office of elastic recall organ under conditions which will be specified later.
  • the mattress chamber 10 is closed, on one of its faces, by the control piston 24.
  • the pump 2 could comprise several pistons l4 coupled to the control piston 24, either directly or indirectly, for example fixed on suitable extensions of the rod 25 which would then pass through one or more chambers 11.
  • annular groove 28 is provided in the intermediate part 13 and communicates with the mattress chamber 10 by means of an annular passage 28a between the jacket 23 and the body 9 of the engine.
  • This annular groove 28 can be placed in communication with a reservoir 29 of compressed air, when the generator starts.
  • a device 30, preferably pneumatically controlled from the reservoir 29 makes it possible to apply an overload to the discharge valve 20.
  • means known in themselves are provided for compensating for leaks of air in the mattress chamber 10 and optionally in the chamber 27 when the latter is used as an elastic return member of the piston 14 of the pump.
  • the one-piece mobile assembly 3 stops even before the piston 7 has reached the piston 24, the air contained in the mattress chamber being however at its maximum pressure. the one-piece assembly 3 is then pushed back in the opposite direction to the arrow F and the purging air is introduced into the chamber 5 under well-known conditions.
  • the spring 26 can push the piston 24 back into the chamber 10, which causes the piston 14 to exit the chamber 11. Under the effect of the vacuum thus created, the hydraulic fluid in the reservoir 19 is drawn into the chamber 11 through the valve 17.
  • a new cycle begins again as soon as the fuel has been introduced into the chamber 5 by the injector 6.
  • pump 2 is very flexible and very safe since there is no mechanical connection between the monobloc assembly 3 and the piston 14.
  • the pulses of the flow delivered by pump 2 are damped by l accumulator 22 which, during the suction phase, returns to the operating circuit the fluid stored during the delivery phase.
  • the regulation of the engine can be ensured by any suitable means, for example by those described in patents FR-A-72 25 175 or 81 05770. In most cases, however, it will suffice to control the injection, and in particular the dosage. , fuel as a function of the power used on the discharge of pump 2. Such commands are well known and it is not useful to describe them here. It should be emphasized, however, that if the fluid flow used is zero, the motor 1 can continue to operate without practically consuming energy. Indeed, the fuel metering will then be such that the pressure in the chamber 10 will not reach a value sufficient to push the piston 24 against the spring 26. This does not of course prevent the return of the monoblock assembly 3 in the opposite direction of arrow F.
  • the one-piece assembly 3 is first brought, by means not shown, to a position very close to the piston 24 in its rest position.
  • the device 30 is placed in communication with the reservoir 29 of compressed air, so that the discharge valve 20 of the pump is greatly overloaded without being completely blocked, and can only open under very high fluid pressure in the chamber 11.
  • the mattress chamber 10 is then connected to the reservoir 29 and the compressed air pushes the monobloc assembly 3 towards the combustion chamber.
  • the injection of fuel is then controlled and the first combustion can take place. Due to the overload imposed on the discharge valve 20, the pistons 14 and 24 cannot move.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

A hydraulic pressure generator comprises, on the one hand, an internal-combustion engine (1), of which part (7) of the free piston (3) moves in a cushioning chamber (10), and, on the other hand, a hydraulic pump (2), the piston (14) of which is coupled to an auxiliary piston (24) arranged in the cushioning chamber (10), a spring (26) acting on the auxiliary piston in the opposite direction to that of the pressure in the cushioning chamber (10). <IMAGE>

Description

On connaît déjà, notamment par les brevets FR-A-72 25175 et 78 32696,des compresseurs à action directe, dans lesquels un moteur à combustion interne assure la compression d'un fluide tel que l'air au moyen d'un piston constituant un ensemble monobloc avec le piston du moteur. Cet ensemble monobloc comporte une partie cylindrique évoluant dans une chambre-matelas étanche, l'air ou le fluide compressible qui y est contenu constituant un élément élastique assurant le retour du piston du moteur en vue de la compression du mélange combustible-comburant. On a également eu l'idée, exposée dans le brevet FR-A- 81 05770, d'atteler directement à l'ensemble monobloc le piston d'une pompe hydraulique à double effet. Toutefois, cette réalisation connue d'un générateur de fluide hydraulique sous pression est surtout destinée à la production d'un débit qui doit êtr.e très régulier et dont la variation, en fonction de la demande, doit pouvoir être obtenue de façon quasi instantanée.Already known, in particular from patents FR-A-72 25 175 and 78 32 696, direct-action compressors, in which an internal combustion engine ensures the compression of a fluid such as air by means of a piston constituting a one-piece assembly with the engine piston. This monobloc assembly comprises a cylindrical part evolving in a sealed mattress chamber, the air or the compressible fluid contained therein constituting an elastic element ensuring the return of the piston of the engine for the compression of the fuel-oxidant mixture. We also had the idea, exposed in patent FR-A-81 05770, to directly couple to the monobloc assembly the piston of a double-acting hydraulic pump. However, this known embodiment of a pressurized hydraulic fluid generator is above all intended for the production of a flow rate which must be very regular and the variation of which, depending on demand, must be able to be obtained almost instantaneously. .

Lorsque ces conditions ne sont pas exigées, la solution proposée par le brevetFR-A-81 05790 apparaît trop onéreuse, de sorte que l'on a été conduit à rechercher un nouveau type de générateur de fluide hydraulique sous pression, capable de supporter un fonctionnement à vide ou à charge partielle pendant de longues périodes sans entraîner une consommation notable d'énergie.When these conditions are not required, the solution proposed by the patent FR-A-81 05790 appears too expensive, so that we have been led to seek a new type of generator of pressurized hydraulic fluid, capable of withstanding an operation unladen or at partial load for long periods without causing significant energy consumption.

A cet égard, on connaît déjà, par le brevet US-A-3 065 703, un générateur de fluide hydraulique sous pression, comportant un moteur à combustion interne dont une partie du piston libre évolue dans une chambre de combustion, tandis qu'une autre partie dudit piston évolue dans une chambre-matelas. Une pompe hydraulique, entraînée par ledit moteur, comporte un piston soumis à l'action d'un organe élastique de rappel.In this regard, we already know, from US-A-3,065,703, a generator of pressurized hydraulic fluid, comprising an internal combustion engine of which a part of the free piston evolves in a combustion chamber, while a another part of said piston evolves in a mattress chamber. A hydraulic pump, driven by said motor, comprises a piston subjected to the action of an elastic return member.

Toutefois, dans ce générateur connu, le matelas assurant l'énergie nécessaire au retour du piston est indépendant de la chambre, emplie d'un fluide compressible, dans laquelle évolue le piston de la pompe hydraulique. Il en résulte divers inconvénients en ce qui concerne la régulation du générateur, car il est nécessaire de prévoir deux régulations indépendantes en fonction, d'une part, de la pression dans le matelas du moteur, d'autre part,de la pression dans la chambre du piston de la pompe hydraulique.However, in this known generator, the mattress ensuring the energy necessary for the return of the piston is independent of the chamber, filled with a compressible fluid, in which the piston of the hydraulic pump operates. This results in various drawbacks as regards the regulation of the generator, since it is necessary to provide two independent regulations as a function, on the one hand, of the pressure in the engine mattress, on the other hand, of the pressure in the hydraulic pump piston chamber.

La présente invention a donc pour objet un générateur de fluide hydraulique du type précité, dont la structure ainsi que la régulation. sont simplifiées et dont la fiabilité et la souplesse sont par conséquent augmentées par rapport à la technique connue.The present invention therefore relates to a hydraulic fluid generator of the aforementioned type, the structure and the regulation. are simplified and whose reliability and flexibility are consequently increased compared to the known technique.

Selon l'invention, le piston de la pompe hydraulique est attelé à un piston auxiliaire indépendant du piston libre du moteur et disposé dans la chambre-matelas, de préférence en regard du piston libre du moteur et coaxialement à celui-ci, cependant que l'organe élastique de rappel du piston de la pompe hydraulique agit sur ledit piston auxiliaire dans le sens opposé à celui de la pression dans la chambre-matelas.According to the invention, the piston of the hydraulic pump is coupled to an auxiliary piston independent of the free piston of the engine and arranged in the mattress chamber, preferably facing the free piston of the engine and coaxially with it, while the the elastic return member of the hydraulic pump piston acts on said auxiliary piston in the opposite direction to that of the pressure in the mattress chamber.

Grâce à cette disposition,.on conserve les avantages de la technique connue ; en particulier, la fermeture du conduit de refoulement de la pompe permet la poursuite du fonctionnement du moteur tout en conduisant à une dépense d'énergie pratiquement nulle.Thanks to this arrangement, .on the advantages of the known technique are retained; in particular, the closing of the pump discharge pipe allows the engine to continue operating while leading to a practically zero energy expenditure.

L'invention sera mieux comprise et diverses caractéristiques secondaires, ainsi que ses avantages, apparaîtront au cours de la description qui va suivre d'un mode avantageux de réalisation en référence au dessin annexé ; sa figure unique représente une coupe longitudinale d'un générateur selon l'invention.The invention will be better understood and various secondary characteristics, as well as its advantages, will appear during the description which follows of an advantageous embodiment with reference to the appended drawing; its single figure represents a longitudinal section of a generator according to the invention.

Ainsi qu'on le voit sur la figure, le générateur comprend un moteur à combustion interne désigné par la référence générale 1 et une pompe hydraulique désignée par la référence générale 2.As can be seen in the figure, the generator comprises an internal combustion engine designated by the general reference 1 and a hydraulic pump designated by the general reference 2.

Le moteur 1 est de préférence du type Diesel à deux temps, décrit dans le brevet FR-A-81 05 770 déjà mentionné. Il comporte essentiellement un ensemble mobile monobloc 3 dont une première partie constitue le piston 4 du moteur évoluant dans la chambre de combustion 5 alimentée en combustible par un injecteur 6. A l'opposé de la chambre de combustion, l'ensemble mobile monobloc 3 présente une partie 7 de diamètre supérieur à celui du piston 4. Cette partie 7 constitue un piston évoluant dans un cylindre 8 ménagé dans le corps 9 du moteur. Dans le cylindre 8, la chambre 10, située du côté opposé à la chambre de combustion 5, est étanche et est dénommée, ainsi qu'on le sait, la chambre-matelas.The engine 1 is preferably of the two-stroke Diesel type, described in the patent FR-A-81 05 770 already mentioned. It essentially comprises a monobloc mobile assembly 3 of which a first part constitutes the piston 4 of the engine operating in the combustion chamber 5 supplied with fuel by an injector 6. Opposite the combustion chamber, the monobloc mobile assembly 3 has a part 7 of diameter greater than that of the piston 4. This part 7 constitutes a piston evolving in a cylinder 8 formed in the body 9 of the engine. In the cylinder 8, the chamber 10, located on the side opposite to the combustion chamber 5, is sealed and is called, as is known, the mattress chamber.

La pompe hydraulique 2 comporte essentiellement une chambre cylindrique 11 ménagée dans un corps de pompe 12 fixé au corps 9 du moteur, de préférence par l'intermédiaire d'une pièce 13. Le piston 14 de la pompe évolue dans la chambre 11 et est guidé par une chemise 15 fixée dans un alésage 16 de la pièce intermédiaire 13.The hydraulic pump 2 essentially comprises a cylindrical chamber 11 formed in a pump body 12 fixed to the body 9 of the motor, preferably by means of a part 13. The piston 14 of the pump moves in the chamber 11 and is guided by a jacket 15 fixed in a bore 16 of the intermediate part 13.

Adjacents à la chambre 11 sont prévus, d'une part, au moins un clapet d'aspiration 17 disposé à l'intérieur d'un conduit 18 débouchant dans la chambre et relié à un réservoir 19 de fluide hydraulique, représenté schématiquement et situé de préférence au-dessus du clapet 17, d'autre part., au moins un clapet de refoulement 20 disposé sur la canalisation de refoulement 21. En dérivation sur cette dernière, il est prévu un accumulateur 22, par exemple du type à membrane, destiné à régulariser, au moins en partie, le débit pulsa- toire fourni par la pompe.Adjacent to the chamber 11 are provided, on the one hand, at least one suction valve 17 disposed inside a conduit 18 opening into the chamber and connected to a reservoir 19 of hydraulic fluid, shown schematically and located preferably above the valve 17, on the other hand, at least one discharge valve 20 disposed on the discharge line 21. As a bypass on the latter, there is provided an accumulator 22, for example of the membrane type, intended to regulate, at least in part, the pulsating flow supplied by the pump.

L'ensemble de la pompe 2 est de préférence disposé, comme le montre la figure, de façon que la chambre 11 et le piston 14 soient coaxiaux au moteur mais cette disposition pourrait- être mofi- fiée dans certains cas particuliers.The assembly of the pump 2 is preferably arranged, as shown in the figure, so that the chamber 11 and the piston 14 are coaxial with the motor, but this arrangement could be modified in certain particular cases.

La pièce intermédiaire 13 reçoit d'autre part une chemise cylindrique 23 à l'intérieur de laquelle peut coulisser un piston auxiliaire 24 pour la commande de la pompe 2. A cet effet, la tête 14a du piston 14 est attelée au piston auxiliaire 24 par une tige 25 fixée aux deux pistons précités. De plus, la tête 14a présente un épaulement 14b susceptible de venir en butée sur la chemise 15 ou même directement sur la pièce intermédiaire 13.The intermediate piece 13 also receives a cylindrical jacket 23 inside which can slide an auxiliary piston 24 for controlling the pump 2. For this purpose, the head 14a of the piston 14 is coupled to the auxiliary piston 24 by a rod 25 fixed to the two aforementioned pistons. In addition, the head 14a has a shoulder 14b capable of coming into abutment on the jacket 15 or even directly on the intermediate piece 13.

Un organe de rappel élastique tel, par exemple, qu'un ressort 26 prend appui sur le piston de commande 24 et sur la pièce intermédiaire 13, la tête 14a du piston 14 limitant le déplacement du piston 24 sous l'action dudit ressort. Il faut cependant noter ici que la chambre 27, délimitée par la pièce 13, la chemise 23 et la face du piston 24 opposée à la chambre-matelas 10, peut être étanche et remplie d'un fluide compressible tel que l'air faisant ainsi office d'organe élastique de rappel dans des conditions que l'on précisera plus loin.An elastic return member such as, for example, a spring 26 bears on the control piston 24 and on the intermediate piece 13, the head 14a of the piston 14 limiting the movement of the piston 24 under the action of said spring. It should however be noted here that the chamber 27, delimited by the part 13, the jacket 23 and the face of the piston 24 opposite the mattress chamber 10, can be sealed and filled with a compressible fluid such as air thereby office of elastic recall organ under conditions which will be specified later.

Quelle que soit la position de la pompe 2 par rapport au moteur 1, et la forme de la pièce intermédiaire 13 qui assure sa fixation au moteur, il est clair que la chambre-matelas 10 est fermée, sur l'une de ses faces, par le piston de commande 24. A cet égard, on soulignera que la pompe 2 pourrait comporter plusieurs pistonsl4 attelés au piston de commande 24, soit directement, soit indirectement, par exemple fixés sur des prolongements convenables de la tige 25 qui traverserait alors une ou plusieurs chambres 11.Whatever the position of the pump 2 relative to the motor 1, and the shape of the intermediate part 13 which ensures its attachment to the motor, it is clear that the mattress chamber 10 is closed, on one of its faces, by the control piston 24. In this regard, it will be emphasized that the pump 2 could comprise several pistons l4 coupled to the control piston 24, either directly or indirectly, for example fixed on suitable extensions of the rod 25 which would then pass through one or more chambers 11.

On signalera encore qu'une gorge annulaire 28 est prévue dans la pièce intermédiaire 13 et communique avec la chambre-matelas 10 grâce à un passage annulaire 28a entre la chemise 23 et le corps 9 du moteur. Cette gorge annulaire 28 peut être mise en communication avec un réservoir 29 d'air comprimé, au moment du démarrage du générateur. En outre, un dispositif 30, de préférence à commande pneumatique à partir du réservoir 29 permet d'appliquer une surcharge au clapet de refoulement 20. Enfin, il est évident que des moyens connus en eux-mêmes sont prévus pour compenser les fuites d'air dans la chambre-matelas 10 et éventuellement dans la chambre 27 lorsque celle-ci est utilisée comme organe de rappel élastique du piston 14 de la pompe.It will also be noted that an annular groove 28 is provided in the intermediate part 13 and communicates with the mattress chamber 10 by means of an annular passage 28a between the jacket 23 and the body 9 of the engine. This annular groove 28 can be placed in communication with a reservoir 29 of compressed air, when the generator starts. In addition, a device 30, preferably pneumatically controlled from the reservoir 29 makes it possible to apply an overload to the discharge valve 20. Finally, it is obvious that means known in themselves are provided for compensating for leaks of air in the mattress chamber 10 and optionally in the chamber 27 when the latter is used as an elastic return member of the piston 14 of the pump.

Le fonctionnement du générateur est alors le suivant.The operation of the generator is then as follows.

Si l'on suppose que le piston moteur 4 se déplace dans le sens de la flèche F sous l'effet de la combustion du mélange combus-. tible-comburant dans la chambre 5, l'air contenu dans la chambre-matelas 10 est comprimé. Lorsque la pression est suffisante, la force s'exerçant sur le piston 24 est supérieure à celle du ressort 26 et le piston 14 de la pompe pénètre dans la chambre 11. Le fluide hydraulique qui s'.y trouve est refoulé vers la canalisation 21 à travers le clapet 20. Une partie de ce fluide est cependant emmagasinée dans l'accumulateur 22.If it is assumed that the driving piston 4 moves in the direction of arrow F under the effect of the combustion of the combus- mixture. tible-oxidant in the chamber 5, the air contained in the mattress-chamber 10 is compressed. When the pressure is sufficient, the force exerted on the piston 24 is greater than that of the spring 26 and the piston 14 of the pump enters the chamber 11. The hydraulic fluid which is there is discharged towards the line 21 through the valve 20. Part of this fluid is however stored in the accumulator 22.

A un certain moment qui dépend des conditions de fonctionnement du moteur et du circuit d'utilisation du fluide débité par la pompe, un équilibre se produit entre les diverses forces de pression en présence. L'ensemble mobile monobloc 3 s'arrête avant même que le piston 7 n'ait atteint le piston 24, l'air contenu dans la chambre-matelas étant cependant alors à sa pression maximale. l'ensemble monobloc 3 est ensuite repoussé dans le sens inverse de la flèche F et l'air de balayage est introduit dans la chambre 5 dans des conditions bien connues.At a certain time which depends on the operating conditions of the engine and the circuit of use of the fluid delivered by the pump, a balance occurs between the various pressure forces present. The one-piece mobile assembly 3 stops even before the piston 7 has reached the piston 24, the air contained in the mattress chamber being however at its maximum pressure. the one-piece assembly 3 is then pushed back in the opposite direction to the arrow F and the purging air is introduced into the chamber 5 under well-known conditions.

La pression dans la chambre 10 diminuant, le ressort 26 peut repousser le piston 24 dans la chambre 10, ce qui provoque la sortie du piston 14 de la chambre 11. Sous l'effet de la dépression ainsi créée, le fluide hydraulique du réservoir 19 est aspiré dans la chambre 11 à travers le clapet 17.As the pressure in the chamber 10 decreases, the spring 26 can push the piston 24 back into the chamber 10, which causes the piston 14 to exit the chamber 11. Under the effect of the vacuum thus created, the hydraulic fluid in the reservoir 19 is drawn into the chamber 11 through the valve 17.

Un nouveau cycle recommence dès que le combustible a été introduit dans la chambre 5 par l'injecteur 6.A new cycle begins again as soon as the fuel has been introduced into the chamber 5 by the injector 6.

Il est à souligner que la commande de la pompe 2 est très souple et très sûre puisqu'il n'existe aucune liaison mécanique entre l'ensemble monobloc 3 et le piston 14. Les pulsations du débit refoulé par la pompe 2 sont amorties par l'accumulateur 22 qui, pendant la phase d'aspiration, renvoie au circuit d'utilisation le fluide emmagasiné pendant la phase de refoulement.It should be emphasized that the control of pump 2 is very flexible and very safe since there is no mechanical connection between the monobloc assembly 3 and the piston 14. The pulses of the flow delivered by pump 2 are damped by l accumulator 22 which, during the suction phase, returns to the operating circuit the fluid stored during the delivery phase.

La régulation du moteur peut être assurée par tout moyen convenable, par exemple par ceux décrits dans les brevets FR-A-72 25175 ou 81 05770. Dans la plupart des cas, cependant, il suffira de commander l'injection, et notamment le dosage, du combustible en fonction de la puissance utilisée sur le refoulement de la pompe 2. De telles commandes sont bien connues et il n'est pas utile de les décrire ici. On soulignera cependant que,si le débit de fluide utilisé est nul, le moteur 1 peut continuer à fonctionner sans pratiquement consommer d'énergie. En effet, le dosage de combustible sera alors tel que la pression dans la chambre 10 n'atteindra pas une valeur suffisante pour pousser le piston 24 contre le ressort 26. Ceci n'empêche pas bien entendu le retour de l'ensemble monobloc 3 dans le sens inverse de la flèche F.The regulation of the engine can be ensured by any suitable means, for example by those described in patents FR-A-72 25 175 or 81 05770. In most cases, however, it will suffice to control the injection, and in particular the dosage. , fuel as a function of the power used on the discharge of pump 2. Such commands are well known and it is not useful to describe them here. It should be emphasized, however, that if the fluid flow used is zero, the motor 1 can continue to operate without practically consuming energy. Indeed, the fuel metering will then be such that the pressure in the chamber 10 will not reach a value sufficient to push the piston 24 against the spring 26. This does not of course prevent the return of the monoblock assembly 3 in the opposite direction of arrow F.

Il convient enfin d'expliquer le démarrage du générateur. L'ensemble monobloc 3 est d'abord amené, par des moyens non représentés, dans une position très voisine du piston 24 dans sa position de repos . Le dispositif 30 est mis en communication avec le réservoir 29 d'air comprimé, de sorte que le clapet de refoulement 20 de la pompe est fortement surchargé sans être complètement bloqué, et ne peut s'ouvrir que sous une pression de fluide très élevée dans la chambre 11. La chambre-matelas 10 est ensuite reliée au réservoir 29 et l'air comprimé pousse l'ensemble monobloc 3 vers la chambre de combustion. L'injection'de combustible est alors commandée et la première combustion peut avoir lieu. En raison de la surcharge imposée au clapet de refoulement 20, les pistons 14 et 24 ne peuvent se déplacer.Finally, the generator start should be explained. The one-piece assembly 3 is first brought, by means not shown, to a position very close to the piston 24 in its rest position. The device 30 is placed in communication with the reservoir 29 of compressed air, so that the discharge valve 20 of the pump is greatly overloaded without being completely blocked, and can only open under very high fluid pressure in the chamber 11. The mattress chamber 10 is then connected to the reservoir 29 and the compressed air pushes the monobloc assembly 3 towards the combustion chamber. The injection of fuel is then controlled and the first combustion can take place. Due to the overload imposed on the discharge valve 20, the pistons 14 and 24 cannot move.

Dès le premier cycle, la surcharge du clapet 20 sera supprimée et la pompe 2 sera entraînée par le moteur dans les conditions précédemment décrites.From the first cycle, the overload of the valve 20 will be eliminated and the pump 2 will be driven by the motor under the conditions described above.

Claims (6)

1. Générateur de fluide hydraulique sous pression, comportant, d'une part un moteur (1) à combustion interne dont une partie (4) du piston libre (3) évolue dans une chambre de combustion (5),tandis qu'une autre partie (7) dudit piston, de diamètre supérieur à celui de la première partie, évolue dans une chambre-matelas (10), d'autre part, une pompe hydraulique (2), entraînée par ledit moteur (1), dont le piston (14) est soumis à l'action d'un organe élastique de rappel, caractérisé en ce que le piston (14) de la pompe hydraulique (2) est attelé à un piston auxiliaire (24) indépendant du piston libre (3) du moteur et disposé dans la chambre-matelas (10), de préférence en regard du piston libre (3) et coaxialement à celui-ci et en ce que l'organe élastique de rappel (26 ou 27) agit sur ledit piston auxiliaire (24) dans le sens opposé à celui de la pression dans la chambre-matelas (10).1. Generator of pressurized hydraulic fluid, comprising, on the one hand an internal combustion engine (1) of which a part (4) of the free piston (3) evolves in a combustion chamber (5), while another part (7) of said piston, of diameter greater than that of the first part, evolves in a mattress chamber (10), on the other hand, a hydraulic pump (2), driven by said motor (1), the piston of which (14) is subjected to the action of an elastic return member, characterized in that the piston (14) of the hydraulic pump (2) is coupled to an auxiliary piston (24) independent of the free piston (3) of the motor and arranged in the mattress chamber (10), preferably facing the free piston (3) and coaxially with it and in that the elastic return member (26 or 27) acts on said auxiliary piston (24 ) in the opposite direction to that of the pressure in the mattress chamber (10). 2. Générateur selon la revendication 1, caractérisé en ce que le diamètre du piston auxiliaire (24) est sensiblement égal au diamètre de la chambre-matelas (10).2. Generator according to claim 1, characterized in that the diameter of the auxiliary piston (24) is substantially equal to the diameter of the mattress chamber (10). 3. Générateur selon l'une quelconque des revendications 1 et 2, caractérisé en ce que l'organe élastique de rappel du piston auxiliaire (24) est un ressort (26) prenant appui d'une part sur la face dudit piston opposée à la chambre-matelas (10), d'autre part sur le carter du moteur.3. Generator according to any one of claims 1 and 2, characterized in that the elastic return member of the auxiliary piston (24) is a spring (26) bearing on the one hand on the face of said piston opposite to the mattress chamber (10), on the other hand on the motor housing. 4. Générateur selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le piston auxiliaire (24) évolue dans une chambre cylindrique étanche (27), susceptible d'être remplie d'un fluide compressible tel, notamment, que l'air, ledit fluide compres-' sible constituant llorgane élastique de rappel du piston auxiliaire(24).4. Generator according to any one of claims 1 and 2, characterized in that the auxiliary piston (24) operates in a sealed cylindrical chamber (27), capable of being filled with a compressible fluid such, in particular, that l air, said compressive fluid 'sible constituting the elastic return member of the auxiliary piston (24). 5 Générateur selon l'une quelconque des revendications précédentes,caractérisé en ce qu'une butée (14a) solidaire du piston auxiliaire(24) limite sa course sous l'action de l'organe élastique de rappel (26, 27).5 Generator according to any one of the preceding claims, characterized in that a stop (14a) integral with the auxiliary piston (24) limits its stroke under the action of the elastic return member (26, 27). 6. Générateur selon la revendication 5,caractérisé en ce que la butée du piston auxiliaire (24) est constituée par la tête (14-14b) du piston (14) de la pompe hydraulique (2).6. Generator according to claim 5, characterized in that the stop of the auxiliary piston (24) is constituted by the head (14-14b) of the piston (14) of the hydraulic pump (2).
EP83400324A 1982-02-16 1983-02-16 Hydraulic-pressure generator Withdrawn EP0086725A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8202504 1982-02-16
FR8202504A FR2521648A1 (en) 1982-02-16 1982-02-16 PRESSURE HYDRAULIC FLUID GENERATOR

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EP0086725A1 true EP0086725A1 (en) 1983-08-24

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EP83400324A Withdrawn EP0086725A1 (en) 1982-02-16 1983-02-16 Hydraulic-pressure generator

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EP (1) EP0086725A1 (en)
JP (1) JPS58192985A (en)
ES (1) ES8401194A1 (en)
FR (1) FR2521648A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629171A1 (en) * 1988-03-25 1989-09-29 Moiroux Auguste HYDROSTATIC TRANSMISSION DEVICE AND APPLICATION TO MOTOR POWERTRAIN OR MOTOR VEHICLE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2527724Y2 (en) * 1987-12-31 1997-03-05 カシオ計算機株式会社 Operation key mounting structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065703A (en) * 1960-11-03 1962-11-27 Int Harvester Co Free piston engine pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065703A (en) * 1960-11-03 1962-11-27 Int Harvester Co Free piston engine pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629171A1 (en) * 1988-03-25 1989-09-29 Moiroux Auguste HYDROSTATIC TRANSMISSION DEVICE AND APPLICATION TO MOTOR POWERTRAIN OR MOTOR VEHICLE
WO1989009144A1 (en) * 1988-03-25 1989-10-05 Auguste Moiroux Motor propulsion, in particular for an automobile vehicle and vehicle comprising such a unit

Also Published As

Publication number Publication date
ES519773A0 (en) 1983-11-16
FR2521648A1 (en) 1983-08-19
JPS58192985A (en) 1983-11-10
ES8401194A1 (en) 1983-11-16

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