EP1999372A1 - Transfer pump for high-pressure petrol injection - Google Patents

Transfer pump for high-pressure petrol injection

Info

Publication number
EP1999372A1
EP1999372A1 EP07731087A EP07731087A EP1999372A1 EP 1999372 A1 EP1999372 A1 EP 1999372A1 EP 07731087 A EP07731087 A EP 07731087A EP 07731087 A EP07731087 A EP 07731087A EP 1999372 A1 EP1999372 A1 EP 1999372A1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
bellows
solenoid valve
pump
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Withdrawn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
EP07731087A
Other languages
German (de)
French (fr)
Inventor
Florent Sellas
Dominique Veret
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.)
Continental Automotive France SAS
Original Assignee
Continental Automotive France SAS
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 Continental Automotive France SAS filed Critical Continental Automotive France SAS
Publication of EP1999372A1 publication Critical patent/EP1999372A1/en
Withdrawn legal-status Critical Current

Links

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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/10—Pumps having fluid drive
    • F04B43/107—Pumps having fluid drive the fluid being actuated directly by a piston
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves

Definitions

  • the present invention relates to the supply of high pressure gasoline injectors for internal combustion engines.
  • pumps such as transfer pumps have been used to provide such a power supply in which an elastically deformable member resistant to the attacks of modern fuels (containing chemically aggressive additives), the deformations of this member being caused by a hydraulic pump. high pressure.
  • the present invention also aims to achieve the regulation of the gasoline flow by performing this regulation in the oil part, but by other means much simpler than those described in the patents cited above.
  • the present invention relates to a transfer pump for injection of high-pressure gasoline of the type comprising a piston displacing oil in a deformable element such as a bellows; the longitudinal deformations of said bellows in a cylindrical chamber filled with fuel causing a pumping effect of said fuel to a rail supplying high-pressure injectors, characterized in that means are provided for wholly or partly diverting the oil pumped by the piston towards a chamber without putting it under pressure so as to determine at will the useful stroke said piston and therefore the amount of fuel pumped at high pressure to the rail.
  • Figure 1 a schematic sectional view of a first embodiment of the invention
  • Figure 2 a schematic sectional view of a second embodiment of the invention.
  • Figure 3 a schematic view corresponding to Figure 2 illustrating an alternative embodiment of the electro control valve.
  • the transfer pump according to the invention is constituted by a piston 1, socio-reduction pump 1 and actuated by a cam 3 so as to have a movement back and forth.
  • the cam 3 has three lobes but this is not limiting.
  • This piston 1 moves in the bore 4 of a cylinder 5.
  • This cylinder 5 is placed in a cylindrical chamber 6 formed in a pump body 7.
  • the cylinder 5 is surrounded by a deformable bellows 8, which maintains a volume 9 between the outer walls of the bellows 8 and the inner walls of the cylindrical chamber 6.
  • an orifice 10 which communicates the bore 4 of the cylinder 5 with the volume 11 between the inner wall of the bellows 8 and the outer wall of the cylinder 5.
  • the bellows 8 is fixed at its upper end to a flange 8a integral with the pump body 7 and at its lower end to a plate 12 controlled by a spring 13.
  • a yoke 14 fixed to the pump body 7, defining therewith a chamber 15, which communicates via a pipe 16 with the volume 11, which communicates through the orifice 10 with the base of the bore 4.
  • a solenoid valve 17, controlled by a solenoid 18 is interposed between the chamber 15 and the pipe 16 which connects the chamber 15 and the volume 11.
  • This solenoid valve 17 is subjected to the action of a spring 17a which tends to keep it open; and the action of the solenoid 18.
  • the action of the spring 17a and the solenoid 18 has the effect of keeping open the electro valve 17 in the open position.
  • the base of the chamber 6 comprises a supply pipe 20 and a delivery pipe 21.
  • the supply pipe 20 is connected to a fuel tank 30 via a pipe 31 comprising a booster pump 32 and a non-return valve 22.
  • the discharge pipe 21 comprises a non-return valve 24 at the outlet of the pump.
  • the oil discharged by the piston 1 pushes the plate 12 against its spring 13 by lengthening the bellows 8.
  • the plate 12 lowers the gasoline contained in 6 is pushed through the non-return valve 24; when the plate 12 returns to its starting position, the gasoline is admitted into the chamber 6 by passing through the nonreturn valve 22.
  • the electro valve 17 is normally open; so that the oil discharged at 4 by the piston 1 passes through the orifice 10, passes through the volume 11 and through the pipe 16 returns to the chamber 15 without increasing pressure; the plate 12 remains stationary and the rail 40 does not receive fuel.
  • the solenoid valve 17 is closed, the oil discharged by the piston 1 can no longer flow through the pipe 16, the plate 12 is pushed back and high pressure fuel is sent into the rail 40.
  • the function of the solenoid 18 is to keep the solenoid valve 17 open when it is activated. When not activated, it is the difference in pressure of the oil between the pipe 16 and the chamber 15 which causes it to close.
  • the amount of fuel sent into the rail 40 is therefore determined by the amount of oil that is displaced by the piston 1 when the solenoid valve 17 is closed.
  • the total stroke of the piston 1 determines the maximum possible amount of fuel sent to the rail 40 when all the oil in the bore 4 is moved, the solenoid valve 17 is closed. By decreasing more or less the amount of oil displaced the amount of fuel sent to the rail 40 is correspondingly reduced. This reduction is obtained by keeping the solenoid valve 17 open for the time necessary to eliminate the excess oil.
  • the solenoid valve 17 is deactivated, which causes it to close and therefore the pumping action to the rail 40.
  • the entire volume of surplus oil is directly discharged into the chamber 15, without being pressurized and re-mixed with the oil in this chamber, which prevents any heating of the oil.
  • the pump thus described is analogous to a variable displacement pump.
  • a non-return valve 25, perfectly sealed is disposed on the pipe supplying the rail 40.
  • This perfectly tight valve is made by overmolding a material such as rubber on a metal part.
  • the perfect seal is provided by the rubber and the metal part prevents the extrusion of the rubber under the effect of pressure.
  • the position of the valve 25 must be determined so that the gas volume between said non-return valve 25 and the chamber 6, in which the bellows is located, is small enough to prevent deformation of the bellows 8 during high pressure engine shutdown.
  • the fuel supply pipe 31 may comprise a device 33 intended to avoid the pulsations caused by the pump.
  • This device is constituted by the combination of a nonreturn valve 34 and a calibrated passage 35 in derivation of said valve 34.
  • Figure 2 shows a variant of Figure 1, the identical elements bearing the same references.
  • the transfer pump is constituted by a piston 1, cortenu by a spring 2 and actuated by a cam 3 (which has four lobes in this example).
  • This piston 1 moves in a bore 41 formed in a pump body 41a.
  • This piston 1 moves inside a deformable bellows 8, which is placed in a cylindrical chamber 6 and which communicates with the bore 41.
  • the bore 41 comprises a circular chamber 45, which will fulfill the role of the chamber 15 of FIG.
  • the internal volume of the bellows 8 is connected by a pipe 46 to a solenoid valve
  • This duct 46 has a bypass 46a which, through a pressure relief valve 49, communicates with a duct 47.
  • This pipe 47 connects the solenoid valve 42 with the accumulator 26, which acts as a heat compensator and volume compensator.
  • valve 48 remains closed and at the beginning, a maximum flow rate is sent to the rail 40. This has the effect that the pressure valve 49 opens: all the flow then goes into the accumulator 26 and the pump is no longer supplied with hydraulic fluid, defuses; so that the engine operates in low pressure injection.
  • valve 48 is biased in the open position by the spring 44; but the hydraulic fluid, arriving through the pipe 46 acts on said valve and closes it, which has the effect that the pumping function continues, that the rail 40 remains fed and that the engine continues to operate in high pressure injection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Transfer pump for high-pressure petrol injection of the type comprising a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of said bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby said fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein means are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of said piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Description

Pompe transfert pour injection d'essence à haute pressionTransfer pump for high pressure fuel injection
La présente invention concerne l'alimentation en essence sous haute pression d'injecteurs pour moteurs à combustion interne.The present invention relates to the supply of high pressure gasoline injectors for internal combustion engines.
Les travaux récents ont montré que l'on améliorait considérablement le rendement d'un moteur à combustion interne utilisant de l'essence comme carburant en injectant ce carburant à haute pression par ce que l'on appelle un rail commun.Recent work has shown that the efficiency of an internal combustion engine using gasoline as a fuel is significantly improved by injecting this fuel at high pressure by what is called a common rail.
On a, en particulier, employé pour réaliser une telle alimentation des pompes dites pompes transfert dans lesquelles un organe élastiquement déformable, résistant aux agressions des carburants modernes (contenant des additifs chimiquement agressifs), les déformations de cet organe étant provoquées par une pompe hydraulique à haute pression.In particular, pumps such as transfer pumps have been used to provide such a power supply in which an elastically deformable member resistant to the attacks of modern fuels (containing chemically aggressive additives), the deformations of this member being caused by a hydraulic pump. high pressure.
On a pu, avec ce genre de pompe, faire fonctionner des moteurs de façon expérimentale, mais il a fallu ensuite résoudre les problèmes posés par la régulation du débit d'essence, ou encore par la rémanence d'essence à haute pression dans le circuit d'alimentation après arrêt du moteur.With this type of pump, it was possible to run engines experimentally, but it was then necessary to solve the problems posed by the regulation of the flow of gasoline, or by the persistence of gasoline at high pressure in the circuit. supply after stopping the engine.
En ce qui concerne la régulation du débit d'essence, deux voies ont été explorées : d'une part la régulation du débit d'essence par recyclage partiel de ce débit en aval de la pompe ; d'autre part la régulation de l'alimentation en essence de la pompe, en amont de celle-ci. D'autre part on a proposé de réaliser la partie régulation du débit d'essence en agissant sur l'alimentation en huile de la pompe transfert.Regarding the regulation of the gasoline flow, two ways have been explored: on the one hand the regulation of the flow of gasoline by partial recycling of this flow downstream of the pump; on the other hand the regulation of the fuel supply of the pump, upstream thereof. On the other hand it has been proposed to achieve the gasoline flow control part by acting on the oil supply of the transfer pump.
Des dispositifs de ce genre ont été décrits dans les brevets 2.826.068 et 2.828.240 déposés au nom du demandeur.Devices of this type have been described in patents 2,826,068 and 2,828,240 filed in the name of the applicant.
La présente invention a également pour but de réaliser la régulation du débit d'essence en réalisant cette régulation dans la partie huile, mais par d'autres moyens beaucoup plus simples que ceux décrits dans les brevets cités ci-dessus.The present invention also aims to achieve the regulation of the gasoline flow by performing this regulation in the oil part, but by other means much simpler than those described in the patents cited above.
La présente invention concerne une pompe transfert pour injection d'essence à haute pression du type comportant un piston refoulant de l'huile dans un élément déformable tel qu'un soufflet ; les déformations longitudinales dudit soufflet dans une chambre cylindrique remplie de carburant provoquant un effet de pompage dudit carburant vers un rail alimentant des injecteurs à haute pression caractérisée par le fait que des moyens sont disposés pour dériver en tout ou en partie l'huile pompée par le piston vers une chambre sans la mettre en pression de façon à déterminer à volonté la course utile dudit piston et donc la quantité de carburant pompé à haute pression vers le rail.The present invention relates to a transfer pump for injection of high-pressure gasoline of the type comprising a piston displacing oil in a deformable element such as a bellows; the longitudinal deformations of said bellows in a cylindrical chamber filled with fuel causing a pumping effect of said fuel to a rail supplying high-pressure injectors, characterized in that means are provided for wholly or partly diverting the oil pumped by the piston towards a chamber without putting it under pressure so as to determine at will the useful stroke said piston and therefore the amount of fuel pumped at high pressure to the rail.
A titre d'exemple et pour faciliter la compréhension de l'invention on a représenté au dessin annexé :By way of example and to facilitate understanding of the invention, the appended drawing shows:
Figure 1 : une vue schématique en coupe d'un premier exemple de réalisation de l'invention Figure 2 : une vue schématique en coupe d'un deuxième exemple de réalisation de l'invention.Figure 1: a schematic sectional view of a first embodiment of the invention Figure 2: a schematic sectional view of a second embodiment of the invention.
Figure 3 : une vue schématique correspondant à la figure 2 illustrant une variante de fonctionnement de l'électro vanne de commande.Figure 3: a schematic view corresponding to Figure 2 illustrating an alternative embodiment of the electro control valve.
En se reportant à la figure 1 on voit que la pompe transfert selon l'invention est constituée par un piston 1, contretenu par un ressort 2 et actionné par une came 3 de façon à avoir un mouvement de va-et-vient. Dans l'exemple représenté la came 3 comporte trois lobes mais cela n'est pas limitatif.Referring to Figure 1 we see that the transfer pump according to the invention is constituted by a piston 1, contretenu by a spring 2 and actuated by a cam 3 so as to have a movement back and forth. In the example shown the cam 3 has three lobes but this is not limiting.
Ce piston 1 se déplace dans l'alésage 4 d'un cylindre 5.This piston 1 moves in the bore 4 of a cylinder 5.
Ce cylindre 5 est placé dans une chambre cylindrique 6 ménagée dans un corps de pompe 7.This cylinder 5 is placed in a cylindrical chamber 6 formed in a pump body 7.
Le cylindre 5 est entouré d'un soufflet déformable 8, ce qui ménage un volume 9 entre les parois extérieures du soufflet 8 et les parois internes de la chambre cylindrique 6.The cylinder 5 is surrounded by a deformable bellows 8, which maintains a volume 9 between the outer walls of the bellows 8 and the inner walls of the cylindrical chamber 6.
A la base du cylindre 5 est disposé un orifice 10 qui fait communiquer l'alésage 4 du cylindre 5 avec le volume 11 compris entre la paroi interne du soufflet 8 et la paroi externe du cylindre 5.At the base of the cylinder 5 is disposed an orifice 10 which communicates the bore 4 of the cylinder 5 with the volume 11 between the inner wall of the bellows 8 and the outer wall of the cylinder 5.
Le soufflet 8 est fixé à son extrémité supérieure à une bride 8a solidaire du corps de pompe 7 et à son extrémité inférieure à un plateau 12 contretenu par un ressort 13. Au-dessus du cylindre 5 est disposée une culasse 14, fixée au corps de pompe 7, définissant avec celui-ci une chambre 15, qui communique par une canalisation 16 avec le volume 11, lequel communique par l'orifice 10 avec la base de l'alésage 4.The bellows 8 is fixed at its upper end to a flange 8a integral with the pump body 7 and at its lower end to a plate 12 controlled by a spring 13. Above the cylinder 5 is arranged a yoke 14, fixed to the pump body 7, defining therewith a chamber 15, which communicates via a pipe 16 with the volume 11, which communicates through the orifice 10 with the base of the bore 4.
Une électrovanne 17, commandée par un solénoïde 18 est interposée entre la chambre 15 et la canalisation 16 qui relie la chambre 15 et le volume 11.A solenoid valve 17, controlled by a solenoid 18 is interposed between the chamber 15 and the pipe 16 which connects the chamber 15 and the volume 11.
Cette électrovanne 17 est soumise à l'action d'un ressort 17a qui tend à la maintenir ouverte ; ainsi qu'à l'action du solénoïde 18. L'action du ressort 17a et du solénoïde 18 a pour effet de maintenir ouverte l'électro vanne 17 en position ouverte.This solenoid valve 17 is subjected to the action of a spring 17a which tends to keep it open; and the action of the solenoid 18. The action of the spring 17a and the solenoid 18 has the effect of keeping open the electro valve 17 in the open position.
La base de la chambre 6 comporte une canalisation d'alimentation 20 et une canalisation de refoulement 21.The base of the chamber 6 comprises a supply pipe 20 and a delivery pipe 21.
La canalisation d'alimentation 20 est reliée à un réservoir de carburant 30 par une canalisation 31 comportant une pompe de gavage 32 et un clapet anti-retour 22.The supply pipe 20 is connected to a fuel tank 30 via a pipe 31 comprising a booster pump 32 and a non-return valve 22.
La canalisation de refoulement 21 comporte un clapet anti-retour 24 au sortir de la pompe. Le fonctionnement du dispositif ainsi décrit, est décrit ci-après :The discharge pipe 21 comprises a non-return valve 24 at the outlet of the pump. The operation of the device thus described is described below:
La rotation de la came 3 provoque, avec le ressort de rappel 2, un mouvement de va- et-vient du piston.The rotation of the cam 3 causes, with the return spring 2, a movement of the piston back and forth.
Comme dans les dispositifs connus, l'huile refoulée par le piston 1 repousse le plateau 12 à rencontre de son ressort 13 en allongeant le soufflet 8. Lorsque le plateau 12 s'abaisse l'essence contenue en 6 est refoulée à travers le clapet antiretour 24 ; lorsque le plateau 12 revient à sa position de départ l'essence est admise dans la chambre 6 en traversant le clapet anti-retour 22.As in the known devices, the oil discharged by the piston 1 pushes the plate 12 against its spring 13 by lengthening the bellows 8. When the plate 12 lowers the gasoline contained in 6 is pushed through the non-return valve 24; when the plate 12 returns to its starting position, the gasoline is admitted into the chamber 6 by passing through the nonreturn valve 22.
Selon la présente invention l'électro vanne 17 est normalement ouverte ; de sorte que l'huile refoulée en 4 par le piston 1 passe par l'orifice 10, traverse le volume 11 et, par la canalisation 16 retourne dans la chambre 15 sans monter en pression ; le plateau 12 demeure immobile et le rail 40 ne reçoit pas de carburant. Lorsque l'électro vanne 17 est fermée, l'huile refoulée par le piston 1 ne peut plus s'écouler par la canalisation 16, le plateau 12 est repoussé et du carburant sous haute pression est envoyé dans le rail 40. Le solénoïde 18 a pour fonction de maintenir l'électro vanne 17 ouverte lorsqu'il est activé. Lorsqu'il n'est pas activé c'est la différence de pression de l'huile entre la canalisation 16 et la chambre 15 qui provoque sa fermeture.According to the present invention the electro valve 17 is normally open; so that the oil discharged at 4 by the piston 1 passes through the orifice 10, passes through the volume 11 and through the pipe 16 returns to the chamber 15 without increasing pressure; the plate 12 remains stationary and the rail 40 does not receive fuel. When the solenoid valve 17 is closed, the oil discharged by the piston 1 can no longer flow through the pipe 16, the plate 12 is pushed back and high pressure fuel is sent into the rail 40. The function of the solenoid 18 is to keep the solenoid valve 17 open when it is activated. When not activated, it is the difference in pressure of the oil between the pipe 16 and the chamber 15 which causes it to close.
La quantité de carburant envoyée dans le rail 40 est donc déterminée par la quantité d'huile qui est déplacée par le piston 1 lorsque l'électrovanne 17 est fermée.The amount of fuel sent into the rail 40 is therefore determined by the amount of oil that is displaced by the piston 1 when the solenoid valve 17 is closed.
La course totale du piston 1 détermine la quantité maximale possible de carburant envoyée au rail 40 lorsque toute l'huile se trouvant dans l'alésage 4, est déplacée, l'électrovanne 17 étant fermée. En diminuant plus ou moins la quantité d'huile déplacée on diminue d'autant la quantité de carburant envoyée au rail 40. Cette diminution est obtenue en maintenant l'électrovanne 17 ouverte pendant le temps nécessaire pour éliminer le surplus d'huile.The total stroke of the piston 1 determines the maximum possible amount of fuel sent to the rail 40 when all the oil in the bore 4 is moved, the solenoid valve 17 is closed. By decreasing more or less the amount of oil displaced the amount of fuel sent to the rail 40 is correspondingly reduced. This reduction is obtained by keeping the solenoid valve 17 open for the time necessary to eliminate the excess oil.
Une fois la quantité d'huile en surplus éliminée, l'électrovanne 17 est désactivée ce qui entraîne sa fermeture et donc l'action de pompage vers le rail 40.Once the surplus amount of oil has been eliminated, the solenoid valve 17 is deactivated, which causes it to close and therefore the pumping action to the rail 40.
Ainsi, selon la présente invention, tout le volume d'huile en surplus est directement refoulé dans la chambre 15, sans être mis en pression et re-mélangé avec l'huile se trouvant dans cette chambre, ce qui évite tout échauffement de l'huile.Thus, according to the present invention, the entire volume of surplus oil is directly discharged into the chamber 15, without being pressurized and re-mixed with the oil in this chamber, which prevents any heating of the oil.
La pompe ainsi décrite est analogue à une pompe à cylindrée variable.The pump thus described is analogous to a variable displacement pump.
Lorsque le débit de sortie en 21 est nul la course du soufflet 8 est nulle, ce qui améliore sa tenue dans le temps. Un dispositif de type connu 26, analogue à un accumulateur compense les variations du volume d'huile entrant ou sortant de la chambre 15.When the output flow at 21 is zero the stroke of the bellows 8 is zero, which improves its behavior over time. A device of known type 26, similar to an accumulator, compensates for variations in the volume of oil entering or leaving the chamber 15.
De préférence, comme cela est représenté, un clapet anti-retour 25, parfaitement étanche est disposé sur la canalisation alimentant le rail 40.Preferably, as shown, a non-return valve 25, perfectly sealed is disposed on the pipe supplying the rail 40.
Ce clapet parfaitement étanche est réalisé en surmoulant une matière telle que du caoutchouc sur une pièce métallique. L'étanchéité parfaite est assurée par le caoutchouc et la partie métallique interdit l'extrusion du caoutchouc sous l'effet de la pression.This perfectly tight valve is made by overmolding a material such as rubber on a metal part. The perfect seal is provided by the rubber and the metal part prevents the extrusion of the rubber under the effect of pressure.
La position du clapet 25 doit être déterminée de façon que le volume essence entre ledit clapet anti-retour 25 et la chambre 6, dans laquelle se trouve le soufflet soit suffisamment petit pour empêcher une déformation du soufflet 8 lors d'un arrêt moteur en haute pression.The position of the valve 25 must be determined so that the gas volume between said non-return valve 25 and the chamber 6, in which the bellows is located, is small enough to prevent deformation of the bellows 8 during high pressure engine shutdown.
Comme cela est représentée la canalisation d'alimentation en essence 31 peut comporter un dispositif 33 destiné à éviter les pulsations provoquées par la pompe. Ce dispositif est constitué par l'association d'un clapet anti-retour 34 et d'un passage calibré 35 en dérivation dudit clapet 34.As shown, the fuel supply pipe 31 may comprise a device 33 intended to avoid the pulsations caused by the pump. This device is constituted by the combination of a nonreturn valve 34 and a calibrated passage 35 in derivation of said valve 34.
La figure 2 représente une variante de la figure 1, les éléments identiques portant les mêmes références.Figure 2 shows a variant of Figure 1, the identical elements bearing the same references.
Comme dans le cas de la figure 1 la pompe transfert est constituée par un piston 1, contretenu par un ressort 2 et actionnée par une came 3 (qui comporte quatre lobes dans cet exemple).As in the case of Figure 1 the transfer pump is constituted by a piston 1, contretenu by a spring 2 and actuated by a cam 3 (which has four lobes in this example).
Ce piston 1 se déplace dans un alésage 41 ménagé dans un corps de pompe 41a.This piston 1 moves in a bore 41 formed in a pump body 41a.
Ce piston 1 se déplace à l'intérieur d'un soufflet déformable 8, qui est placé dans une chambre cylindrique 6 et qui communique avec l'alésage 41. L'alésage 41 comporte une chambre circulaire 45, qui va remplir le rôle de la chambre 15 de la figure 1.This piston 1 moves inside a deformable bellows 8, which is placed in a cylindrical chamber 6 and which communicates with the bore 41. The bore 41 comprises a circular chamber 45, which will fulfill the role of the chamber 15 of FIG.
Le volume interne du soufflet 8 est relié par une canalisation 46 à une électrovanneThe internal volume of the bellows 8 is connected by a pipe 46 to a solenoid valve
42.42.
Cette canalisation 46, comporte une dérivation 46a qui, à travers un clapet de surpression 49, communique avec une canalisation 47.This duct 46 has a bypass 46a which, through a pressure relief valve 49, communicates with a duct 47.
Cette canalisation 47 relie l'électrovanne 42 avec l'accumulateur 26, qui joue le rôle de compensateur thermique et compensateur de volume.This pipe 47 connects the solenoid valve 42 with the accumulator 26, which acts as a heat compensator and volume compensator.
Sur la figure 2 on voit que le ressort 44 de l'électrovanne 42 exerce une poussée qui maintient le clapet 48 en position ouverte pour laquelle la canalisation 46 communique avec la canalisation 47 et donc avec la chambre 45 et l'accumulateur 26.In FIG. 2 it can be seen that the spring 44 of the solenoid valve 42 exerts a thrust that keeps the valve 48 in the open position for which the pipe 46 communicates with the pipe 47 and thus with the chamber 45 and the accumulator 26.
Sur la figure 3 on voit que le ressort 44 de l'électrovanne 42 exerce un effort qui sollicite le clapet 48 en position fermée. Quand le clapet 48 de l'électrovanne 42 est fermé le volume de liquide hydraulique se trouvant à l'intérieur du soufflet 8 est mis en pression par le mouvement du piston 1, ce soufflet s'allonge ; de sorte que le carburant se trouvant dans la chambre 6 est refoulé par la canalisation 21 vers le rail 40. Quand le clapet 48 de l'électrovanne 42 est ouvert le liquide hydraulique se trouvant à l'intérieur du soufflet 8, s'écoule à travers ce clapet dans la canalisation 47 et vers l'accumulateur 26 et la chambre 45 ; de sorte qu'il n'y a pas d'effet de pompage.In Figure 3 we see that the spring 44 of the solenoid valve 42 exerts a force that urges the valve 48 in the closed position. When the valve 48 of the solenoid valve 42 is closed, the volume of hydraulic fluid inside the bellows 8 is pressurized by the movement of the piston 1, this bellows elongates; so that the fuel in the chamber 6 is discharged through the pipe 21 to the rail 40. When the valve 48 of the solenoid valve 42 is open the hydraulic fluid located inside the bellows 8, flows to through this valve in the pipe 47 and to the accumulator 26 and the chamber 45; so that there is no pumping effect.
La différence entre la disposition de la figure 2 et celle de la figure 3 est que le fonctionnement n'est pas le même en cas de défaillance ou de non-alimentation de l'électrovanne 42.The difference between the arrangement of FIG. 2 and that of FIG. 3 is that the operation is not the same in the event of failure or non-supply of the solenoid valve 42.
Si un tel dysfonctionnement se produit :If such a malfunction occurs:
- dans le cas de la figure 3, le clapet 48 demeure fermé et, au début, un débit maximum est envoyé au rail 40. Cela a pour effet que le clapet de surpression 49 s'ouvre : tout le débit va alors dans l'accumulateur 26 et, la pompe n'étant plus alimentée en liquide hydraulique, se désamorce ; de sorte que le moteur fonctionne en injection basse pression.- In the case of Figure 3, the valve 48 remains closed and at the beginning, a maximum flow rate is sent to the rail 40. This has the effect that the pressure valve 49 opens: all the flow then goes into the accumulator 26 and the pump is no longer supplied with hydraulic fluid, defuses; so that the engine operates in low pressure injection.
- dans le cas de la figure 2, le clapet 48 est sollicité en position ouverte par le ressort 44 ; mais le liquide hydraulique, arrivant par la canalisation 46 agit sur ledit clapet et le referme, ce qui a pour effet que la fonction de pompage continue, que le rail 40 demeure alimenté et que le moteur continue à fonctionner en injection haute pression.- In the case of Figure 2, the valve 48 is biased in the open position by the spring 44; but the hydraulic fluid, arriving through the pipe 46 acts on said valve and closes it, which has the effect that the pumping function continues, that the rail 40 remains fed and that the engine continues to operate in high pressure injection.
L'un ou l'autre de ces modes de fonctionnement sera choisi par l'utilisateur. One or other of these modes of operation will be chosen by the user.

Claims

Revendicationsclaims
1/- Pompe transfert pour injection d'essence à haute pression du type comportant un piston (1) refoulant de l'huile dans un élément déformable tel qu'un soufflet (8), les déformations dudit soufflet (8) dans une chambre cylindrique (6) remplie de carburant provoquant un effet de pompage dudit carburant vers un rail (40) alimentant des injecteurs à haute pression caractérisée par le fait que des moyens sont disposés pour dériver en tout ou en partie l'huile pompée par le piston (1) vers une capacité (15) sans la mettre en pression de façon à déterminer à volonté la course utile dudit piston (1) et donc la quantité de carburant pompé à haute pression vers le rail (40).1 / - Transfer pump for injection of high-pressure gasoline of the type comprising a piston (1) discharging oil into a deformable element such as a bellows (8), the deformations of said bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect of said fuel to a rail (40) supplying high-pressure injectors, characterized in that means are provided for wholly or partly diverting the oil pumped by the piston (1 ) to a capacity (15) without putting pressure in order to determine at will the useful stroke of said piston (1) and thus the amount of fuel pumped at high pressure to the rail (40).
21- Pompe selon la revendication 1 caractérisée par le fait que le piston (1) se déplace de façon alternative dans un alésage (4) ménagé dans un cylindre (5) lui-même placé dans une chambre cylindrique (6), remplie de carburant, ledit cylindre (5) étant entouré par un soufflet (8) dont l'enceinte interne (11) est en communication avec l'alésage (4) par un orifice (10), les mouvements de va-et-vient du piston (1) provoquant l'allongement et le raccourcissement du soufflet (8), lui-même solidaire d'un plateau (12) qui, par ses déplacements, aspire et refoule le carburant. 3/- Pompe selon la revendication 2 dans laquelle l'enceinte interne (11) du soufflet (8) communique avec une réserve d'huile (15) par l'intermédiaire d'une canalisation (16) munie d'une électrovanne (17).21- Pump according to claim 1 characterized in that the piston (1) moves alternately in a bore (4) formed in a cylinder (5) itself placed in a cylindrical chamber (6), filled with fuel , said cylinder (5) being surrounded by a bellows (8) whose internal chamber (11) is in communication with the bore (4) via an orifice (10), the reciprocating movements of the piston ( 1) causing the lengthening and shortening of the bellows (8), itself secured to a plate (12) which, by its movements, sucks and represses the fuel. 3 / - Pump according to claim 2 wherein the inner chamber (11) of the bellows (8) communicates with a reserve of oil (15) via a pipe (16) provided with a solenoid valve (17). ).
Al- Pompe selon la revendication 3 dans laquelle lorsque l'électro vanne est ouverte l'huile déplacée par le piston (1) est retournée dans la chambre (15) sans être mise en pression ; le soufflet (8) et le plateau (12) n'étant mis en action que lorsque l'électro vanne (17) est fermée.Al-Pump according to claim 3 wherein when the solenoid valve is open oil moved by the piston (1) is returned to the chamber (15) without being pressurized; the bellows (8) and the plate (12) being activated only when the solenoid valve (17) is closed.
5/- Pompe selon les revendications 3 et 4 dans laquelle l'électrovanne (17) est ouverte lorsqu'elle est activée et fermée par la différence de pression entre ses bornes. 61- Pompe selon les revendications 3 à 5 dans laquelle, lors de la course d'alimentation du piston, l'huile est introduite dans l'alésage (4) par la canalisation (16) à travers l' électrovanne (17).5 / - Pump according to claims 3 and 4 wherein the solenoid valve (17) is open when it is activated and closed by the pressure difference between its terminals. 61- Pump according to claims 3 to 5 wherein, during the supply stroke of the piston, the oil is introduced into the bore (4) through the pipe (16) through the solenoid valve (17).
Il- Pompe selon l'une quelconque des revendications 1 à 6 dans laquelle le piston (1) est mû par une came (3) pouvant comporter un ou plusieurs lobes.II- Pump according to any one of claims 1 to 6 wherein the piston (1) is moved by a cam (3) may comprise one or more lobes.
8/- Pompe selon la revendication 1 dans laquelle le piston (1) se déplace dans un alésage (41) ménagé dans un corps de pompe (41a), communiquant avec le volume intérieur d'un soufflet (8) placé dans une chambre cylindrique (6) ; ce volume intérieur du soufflet (8) communiquant à travers le clapet (48) d'une électrovanne (42) avec une chambre (45) et un accumulateur (26) ; de telle sorte que lorsque ledit clapet (48) est fermé il y ait un effet de pompage du carburant et que lorsque ledit clapet (48) est ouvert il n'y ait aucun effet de pompage.8 / - Pump according to claim 1 wherein the piston (1) moves in a bore (41) formed in a pump body (41a), communicating with the internal volume of a bellows (8) placed in a cylindrical chamber (6); this interior volume of the bellows (8) communicating through the valve (48) of a solenoid valve (42) with a chamber (45) and an accumulator (26); such that when said valve (48) is closed there is a pumping effect of the fuel and when said valve (48) is open there is no pumping effect.
91- Pompe selon la revendication 8 dans laquelle le clapet (48) de l'électrovanne (42) est sollicité par le ressort (44) de ladite électrovanne en position fermée ; de telle sorte que, en cas de défaillance de la commande de l'électrovanne il y a un débit d'huile maximum, ce qui a pour effet de provoquer l'ouverture du clapet de surpression (49) ce qui désamorce la pompe et le moteur fonctionne en injection basse pression.91- pump according to claim 8 wherein the valve (48) of the solenoid valve (42) is biased by the spring (44) of said solenoid valve in the closed position; such that, in the event of a failure of the solenoid valve control, there is a maximum oil flow, which has the effect of causing the pressure relief valve (49) to open, thereby defusing the pump and the pump. engine operates in low pressure injection.
10/- Pompe selon la revendication 8 dans laquelle le clapet (48) de l'électrovanne (42) est sollicité par le ressort (44) en position ouverte ; de sorte que, en cas de défaillance de la commande de l'électrovanne le liquide hydraulique arrivant par la canalisation (46) agit sur ledit clapet (48), ce qui maintient la fonction de pompage haute pression.10 / - Pump according to claim 8 wherein the valve (48) of the solenoid valve (42) is biased by the spring (44) in the open position; so that, in the event of failure of the control of the solenoid valve the hydraulic fluid arriving through the pipe (46) acts on said valve (48), which maintains the high pressure pumping function.
11/- Pompe selon l'une quelconque des revendications précédentes dans laquelle la canalisation allant de la pompe au rail d'injection (40) est munie d'un clapet étanche (25) placé en une position telle que le volume de conduite allant dudit clapet (25) à la chambre (6) où se trouve le soufflet (8) ait un volume aussi petit que possible pour éviter un hydroformage en cas d'arrêt du moteur en haute pression.11 / - Pump according to any one of the preceding claims wherein the pipe from the pump to the injection rail (40) is provided with a sealed valve (25) placed at a position such that the driving volume of said valve (25) to the chamber (6) where the bellows (8) is located has a volume as small as possible to avoid hydroforming in case of high pressure engine shutdown.
12/- Pompe selon l'une quelconque des revendications précédentes dans laquelle la canalisation (31) d'alimentation de la pompe comporte un dispositif anti-pulsation (33). 12 / - Pump according to any one of the preceding claims wherein the pipe (31) for supplying the pump comprises an anti-pulsation device (33).
EP07731087A 2006-03-24 2007-03-05 Transfer pump for high-pressure petrol injection Withdrawn EP1999372A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0602594A FR2898942B1 (en) 2006-03-24 2006-03-24 TRANSFER PUMP FOR HIGH PRESSURE FUEL INJECTION
PCT/FR2007/000388 WO2007110492A1 (en) 2006-03-24 2007-03-05 Transfer pump for high-pressure petrol injection

Publications (1)

Publication Number Publication Date
EP1999372A1 true EP1999372A1 (en) 2008-12-10

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EP07731087A Withdrawn EP1999372A1 (en) 2006-03-24 2007-03-05 Transfer pump for high-pressure petrol injection

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US (1) US8025488B2 (en)
EP (1) EP1999372A1 (en)
JP (1) JP4887421B2 (en)
KR (1) KR20080102318A (en)
FR (1) FR2898942B1 (en)
WO (1) WO2007110492A1 (en)

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JP5438611B2 (en) * 2010-07-09 2014-03-12 株式会社コガネイ Chemical supply device
WO2017106675A1 (en) * 2015-12-18 2017-06-22 Graco Minnesota Inc. Bellows pressure relief valve
KR20170076126A (en) * 2015-12-24 2017-07-04 주식회사 현대케피코 Cam driven electronic control valve for diesel engine in high-pressure fuel transferring system
DE112021005047T5 (en) * 2020-12-03 2023-09-14 Cummins Inc. Fuel pump devices, systems and methods
CN114738250B (en) * 2022-04-25 2023-07-21 俞贵伍 High-temperature high-pressure mortar pump

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Publication number Publication date
FR2898942B1 (en) 2008-05-02
KR20080102318A (en) 2008-11-24
FR2898942A1 (en) 2007-09-28
US20090169398A1 (en) 2009-07-02
US8025488B2 (en) 2011-09-27
JP4887421B2 (en) 2012-02-29
WO2007110492A1 (en) 2007-10-04
JP2009530540A (en) 2009-08-27

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