EP3824174B1 - Common-rail injection device - Google Patents

Common-rail injection device Download PDF

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Publication number
EP3824174B1
EP3824174B1 EP19752733.6A EP19752733A EP3824174B1 EP 3824174 B1 EP3824174 B1 EP 3824174B1 EP 19752733 A EP19752733 A EP 19752733A EP 3824174 B1 EP3824174 B1 EP 3824174B1
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EP
European Patent Office
Prior art keywords
injection well
injection
zone
cylindrical element
channel
Prior art date
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Active
Application number
EP19752733.6A
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German (de)
French (fr)
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EP3824174A1 (en
Inventor
Pierre-Yves GRIVEAU
Gilles DAUBORD
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Duncha France SAS
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Duncha France SAS
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Publication of EP3824174A1 publication Critical patent/EP3824174A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the present invention relates to a common rail injection device for an internal combustion engine.
  • the injection devices of the state of the art comprise a common rail having a main chamber, an inlet orifice opening into the main chamber and intended to be connected to a fuel supply tube, a plurality of wells injection which are distributed along the common rail and are each intended to receive an injector and a plurality of conduits each allowing the main chamber to be connected to one of the injection wells.
  • the injection wells are offset from the main chamber of the common rail.
  • the geometric axis of the injection wells does not cross the main chamber of the common rail.
  • the machining is carried out transversely to the common rail through the main chamber of the common rail.
  • the injection devices are equipped with nozzles which are formed by a reduction in the fuel passage section so as to generate a pressure loss which makes it possible to dampen the pressure waves.
  • the first consists of fitting an axially drilled cylindrical element into the conduit connecting the main chamber of the common rail to the injection well. This fitting is particularly difficult to achieve, given the restricted accessibility of the conduits, for the aforementioned structures in which the injection wells are offset from the main chamber of the common rail.
  • the conduit connecting the main chamber to the injection well presents at the junction between said conduit and the injection well a weaker section.
  • the machining of this weaker section requires the use of a drill of small diameter but of significant length to reach the end of the conduit.
  • the use of a small drill bit over such a long length makes it fragile with a risk of generating numerous manufacturing rejects and defects in the finished product.
  • one of the aims of the present invention is to provide an injection device comprising a common rail, which makes it possible to obviate the above drawbacks.
  • Another aim of the invention is to provide such a device which is simple and inexpensive to produce.
  • the sprinkler function being carried out in a more easily accessible zone, namely in the bottom of the injection well and not in the conduit, said function can be carried out in a simpler and more reliable manner.
  • such an injection device may have one or more of the following characteristics.
  • the nozzle is a cylindrical element which is fitted into the bottom of the injection well and which provides a space for the passage of fuel from the conduit to the injector interface zone.
  • a cylindrical element forming a nozzle can thus be fitted more easily into the bottom of the injection well than when it must be fitted into the conduit connecting the main chamber to the bottom of the injection well.
  • the cylindrical element is force-fitted into the bottom of the injection well.
  • the bottom of the injection well has a diameter smaller than that of the injector interface zone. This facilitates the fitting of the cylindrical element forming a nozzle into the bottom of the injection well.
  • the nozzle comprises at least a first channel and a second channel opening into each other and opening respectively facing the injector interface zone and facing the conduit, the first channel and the second channel having a diameter smaller than that of the conduit.
  • the nozzle abuts against the end of the injection well. This ensures precise axial positioning of the cylindrical element along the first axis.
  • the cylindrical element comprises keying means making it possible to guarantee positioning of the nozzle relative to the bottom of the injection well in a relative position such that the second channel is directed facing the conduit.
  • the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a channel crossing oriented along the first axis, opening on the one hand into said bottom zone and, on the other hand, into the injector interface zone.
  • the through channel oriented along the first axis has a diameter smaller than that of the conduit.
  • the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a flat providing a space between the cylindrical element and a bottom wall of the injection well allowing the passage of fuel from said bottom zone to the injector interface zone.
  • the injection device 1 represents an injection device designated as a whole by the reference 1.
  • the injection device 1 comprises a common rail 2 which extends in a longitudinal direction.
  • the common rail 2 is hollow and thus defines a main chamber 4 of tubular shape, illustrated in the figure 2 , extending in the longitudinal direction of the common rail 2.
  • the common rail 2 is advantageously made in one piece, for example by a forging process.
  • the common rail 2 includes an inlet orifice 3 opening into the main chamber 4 of the common rail 2 and intended to be connected to a fuel supply tube, not illustrated.
  • the common rail 2 comprises injection wells 5 which are each intended to receive an injector 9, partially illustrated in the figure 2 .
  • Each of the injection wells 5 extends along a geometric axis A.
  • the injection wells 5 are offset relative to the main chamber 4. In other words, the geometric axis A of each injection well 5 does not pass through the main chamber 4.
  • Each injection well 5 has a bottom 5a and an injector interface zone 5b in which the injector 9 is mounted.
  • the bottom 5a like the injector interface zone 5b of each injection well 5 presents a general cylindrical shape.
  • the main chamber 4 of the common rail 2 is connected to each of the injection wells 5 by means of a conduit 6.
  • Each conduit 6 has a cylindrical shape extending along an axis B which intersects the axis A.
  • Each leads 6 opens, on the one hand, into the main chamber 4, and, on the other hand, into the bottom 5a of one of the injection wells 5 and thus makes it possible to conduct the fuel from the main chamber 4 towards said well. injection 5.
  • the conduit 6 opens laterally, that is to say at the level of the peripheral wall of the bottom 5a of the injection well 5.
  • each conduit 6 is machined transversely to the longitudinal axis of the common rail 2 and from the side of the common rail 2 opposite the injection wells. injection 5.
  • a through bore 7 is necessarily formed, in the common rail 2, facing said conduit 6.
  • the bore 7 extends coaxially to the geometric axis B of the conduit 6.
  • the diameter of conduit 6 is for example between 3 and 5 mm.
  • the axis B passes through the central axis of the main chamber 4.
  • the bore 7 is intended to be sealed in a sealed manner by means of a closing device, not shown.
  • the injection device 1 comprises a nozzle 8 provided in the bottom 5a of each of the injection wells 5.
  • the nozzle 8 aims to reduce the fuel passage section between the conduit 6 and the injector interface zone 5b of the injection well 5.
  • the nozzle 8 thus generates a pressure loss which makes it possible to dampen the pressure waves.
  • the nozzle 8 is a cylindrical element which is force-fitted into the bottom 5a of the injection well 5.
  • the nozzle 8 is for example made of stainless steel.
  • the bottom 5a has a diameter smaller than that of the injector interface zone 5b.
  • the nozzle 8 comprises a frustoconical portion 20 which is positioned, along the axis A, facing the conduit 6 and which thus allows the fuel to penetrate into the bottom 5a of the injection well 5, and more particularly in a zone located between the end 11 of the injection well 5 and the nozzle 8.
  • the nozzle 8 also includes a through channel 10, which is oriented along the axis A of the injection well 5 and thus makes it possible to conduct the fuel from the aforementioned bottom zone 5a from the injection well 5 towards the injector interface zone 5b.
  • channel 10 passes through nozzle 8 at its center.
  • the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
  • the nozzle 8 further comprises one or more transverse channels 13 which pass through the nozzle 8 radially.
  • the channels 13 pass through the channel 10 and are advantageously perpendicular to said channel 10.
  • the nozzle 8 is oriented in the bottom 5a of the injection well 5 so that one of the channels 13 opens facing the conduit 6. Thanks to the plurality of channels 13, there is a greater number of positions making it possible to ensure relative positioning of the nozzle 8 relative to the injection well 5 in which one of the channels 13 opens facing the conduit 6.
  • the nozzle 8 comprises keying means making it possible to guarantee positioning of the nozzle 8 in a relative position such that one of the channels 13 is directed facing the conduit 6.
  • the coding means are formed by a visual indication provided on the lower surface of the nozzle 8.
  • the bottom 5a of the injection well and the nozzle 8 each have a singularity complementary geometry to ensure mechanical keying.
  • the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
  • the nozzle 8 further comprises a blind channel 15 which is oriented in a radial orientation at the axis A, perpendicular to said channel 10.
  • channel 15 opens opposite conduit 6 and, on the other hand, it joins channel 10 so as to allow the passage of fuel from conduit 6 towards the zone d injector interface 5b of the injection well 5.
  • the nozzle 8 comprises keying means, as described above, making it possible to guarantee positioning of the nozzle in a position such that the channel 15 is directed in view of conduit 6.
  • the nozzle 8 comprises a channel 16 which is oriented along the axis A.
  • the channel 16 is blind, that is to say it only opens opposite the injector interface zone 5b of the injection well 5a.
  • the nozzle 8 further comprises another channel 15, also blind, which is oriented, in a radial orientation to the axis A, perpendicular to said channel 16.
  • the channel 15 opens opposite the conduit 6 and joins the channel 16 so as to allow the passage of fuel from conduit 6 to the injector interface zone 5b of the injection well 5.
  • the nozzle 8 is also likely to include keying means. Furthermore, in this embodiment, the nozzle 8 abuts against the end 11 of the injection well 5, which ensures correct positioning of the nozzle 8, and more particularly of the channel 15, along the A axis.
  • the channels 10, 13, 15, 16 have a diameter smaller than that of the conduit 6 in order to generate a pressure loss.
  • their diameter is between 0.75 to 1.5 mm.
  • the nozzle 8 does not have a channel but has a flat 8c extending over the entire length of said nozzle 8.
  • the nozzle 8 is fitted into the bottom 5a of the injection well 5 so as to maintain a space 18 between the conduit 6 and a zone located between the end 11 of the injection well 5 and the nozzle 8.
  • the flat 8c thus makes it possible to provide between the nozzle 8 and the cylindrical wall of the bottom 5a of the injection well 5 a space 19 authorizing the passage of fuel towards the injector interface zone 5b.
  • the axis A of the injection well 5 passes through the conduit 6 so that the bottom 5a of the injection well 5 opens into the conduit 6.
  • the bottom 5a of the injection well 5 which communicates the zone d
  • the injector interface 5b with the conduit 6 has a diameter smaller than that of the conduit 6 and that of the injector interface zone 5b.
  • the diameter of the bottom 5a of the injection well 5 is for example between 0.75 to 1.5 mm.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Domaine techniqueTechnical area

La présente invention est relative à un dispositif d'injection à rampe commune pour moteur à combustion interne.The present invention relates to a common rail injection device for an internal combustion engine.

Arrière-plan technologiqueTechnology background

Les dispositifs d'injection de l'état de la technique comportent une rampe commune présentant une chambre principale, un orifice d'entrée débouchant dans la chambre principale et destiné à être raccordé à un tube d'alimentation en carburant, une pluralité de puits d'injection qui sont répartis le long de la rampe commune et sont chacun destinés à recevoir un injecteur et une pluralité de conduits permettant chacun de relier la chambre principale à l'un des puits d'injection.The injection devices of the state of the art comprise a common rail having a main chamber, an inlet orifice opening into the main chamber and intended to be connected to a fuel supply tube, a plurality of wells injection which are distributed along the common rail and are each intended to receive an injector and a plurality of conduits each allowing the main chamber to be connected to one of the injection wells.

Il est connu de la demanderesse que, afin d'adapter l'encombrement du dispositif d'injection à son environnement à l'intérieur du véhicule, les puits d'injections sont déportés par rapport à la chambre principale de la rampe commune. En d'autres termes, l'axe géométrique des puits d'injection ne traverse pas la chambre principale de la rampe commune. Aussi, afin de pouvoir usiner le conduit reliant la chambre principale au puits d'injection, l'usinage est réalisé transversalement à la rampe commune au travers de la chambre principale de la rampe commune.It is known to the applicant that, in order to adapt the size of the injection device to its environment inside the vehicle, the injection wells are offset from the main chamber of the common rail. In other words, the geometric axis of the injection wells does not cross the main chamber of the common rail. Also, in order to be able to machine the conduit connecting the main chamber to the injection well, the machining is carried out transversely to the common rail through the main chamber of the common rail.

Les dispositifs d'injection sont équipés de gicleurs qui sont formés par une réduction de la section de passage du carburant de manière à générer une perte de charge qui permet d'amortir les ondes de pression. Actuellement, il existe au moins deux technologies de gicleur. La première consiste à emmancher dans le conduit reliant la chambre principale de la rampe commune au puits d'injection un élément cylindrique percé axialement. Cet emmanchement est particulièrement difficile à réaliser, compte-tenu de l'accessibilité restreinte des conduits, pour les structures précitées dans lesquels les puits d'injections sont déportés par rapport à la chambre principale de la rampe commune.The injection devices are equipped with nozzles which are formed by a reduction in the fuel passage section so as to generate a pressure loss which makes it possible to dampen the pressure waves. Currently, there are at least two sprinkler technologies. The first consists of fitting an axially drilled cylindrical element into the conduit connecting the main chamber of the common rail to the injection well. This fitting is particularly difficult to achieve, given the restricted accessibility of the conduits, for the aforementioned structures in which the injection wells are offset from the main chamber of the common rail.

Selon une deuxième technologie, le conduit reliant la chambre principale au puits d'injection présente à la jonction entre ledit conduit et le puits d'injection une section plus faible. Pour les structures précitées dans lesquels les puits d'injections sont déportés par rapport à la chambre principale de la rampe commune, l'usinage de cette section plus faible requiert l'utilisation d'un foret de faible diamètre mais de longueur importante pour atteindre l'extrémité du conduit. Or, l'utilisation d'un foret de petite taille sur une aussi grande longueur rend celui-ci fragile avec un risque de générer de nombreux rebus de fabrication et des défauts sur le produit fini.According to a second technology, the conduit connecting the main chamber to the injection well presents at the junction between said conduit and the injection well a weaker section. For the aforementioned structures in which the injection wells are offset from the main chamber of the common rail, the machining of this weaker section requires the use of a drill of small diameter but of significant length to reach the end of the conduit. However, the use of a small drill bit over such a long length makes it fragile with a risk of generating numerous manufacturing rejects and defects in the finished product.

DE102007049357 et WO01/71179 A2 divulguent un dispositif d'injection selon le préambule de la revendication 1. DE102007049357 And WO01/71179 A2 disclose an injection device according to the preamble of claim 1.

RésuméSummary

Aussi un des buts de la présente invention est-il de fournir un dispositif d'injection comportant une rampe commune, qui permet d'obvier les inconvénients ci-dessus.Also one of the aims of the present invention is to provide an injection device comprising a common rail, which makes it possible to obviate the above drawbacks.

Un autre but de l'invention est de fournir un tel dispositif dont la réalisation est simple et peu coûteuse.Another aim of the invention is to provide such a device which is simple and inexpensive to produce.

Ces buts, ainsi que d'autres qui apparaîtront pas la suite, sont atteints par un dispositif d'injection comportant une rampe commune s'étendant dans une direction longitudinale et définissant un chambre principale, la rampe commune comportant :

  • un orifice d'entrée débouchant dans la chambre principale et destiné à être raccordé à un tube d'alimentation en carburant,
  • au moins un puits d'injection s'étendant selon un premier axe, ledit puits d'injection comportant un fond et une zone d'interface injecteur dans laquelle est destiné à être monté un injecteur ;
  • au moins un conduit transversal s'étendant selon un deuxième axe et débouchant dans la chambre principale, d'une part, et dans le fond du puits d'injection, d'autre part, de manière à relier la chambre principale audit puits d'injection, le premier et le deuxième axes étant sécants ; et
  • un gicleur agencé dans le fond du puits d'injection et réduisant la section de passage du carburant entre le conduit et la zone d'interface injecteur du puits d'injection.
These goals, as well as others which will appear later, are achieved by an injection device comprising a common rail extending in a longitudinal direction and defining a main chamber, the common rail comprising:
  • an inlet port opening into the main chamber and intended to be connected to a fuel supply tube,
  • at least one injection well extending along a first axis, said injection well comprising a bottom and an injector interface zone in which an injector is intended to be mounted;
  • at least one transverse conduit extending along a second axis and opening into the main chamber, on the one hand, and into the bottom of the injection well, on the other hand, so as to connect the main chamber to said injection well injection, the first and second axes being intersecting; And
  • a nozzle arranged in the bottom of the injection well and reducing the fuel passage section between the conduit and the injector interface zone of the injection well.

Ainsi, la fonction gicleur étant réalisée dans une zone plus facilement accessible, à savoir dans le fond du puits d'injection et non dans le conduit, ladite fonction peut être réalisée de manière plus simple et plus fiable.Thus, the sprinkler function being carried out in a more easily accessible zone, namely in the bottom of the injection well and not in the conduit, said function can be carried out in a simpler and more reliable manner.

Selon d'autres modes de réalisation avantageux, un tel dispositif d'injection peut présenter une ou plusieurs des caractéristiques suivantes.According to other advantageous embodiments, such an injection device may have one or more of the following characteristics.

Selon un mode de réalisation, le gicleur est un élément cylindrique qui est emmanché dans le fond du puits d'injection et qui ménage un espace de passage du carburant du conduit vers la zone d'interface injecteur. Un tel élément cylindrique formant gicleur peut ainsi être emmanché de manière plus facile dans le fond du puits d'injection que lorsqu'il doit être emmanché dans le conduit reliant la chambre principale au fond du puits d'injection.According to one embodiment, the nozzle is a cylindrical element which is fitted into the bottom of the injection well and which provides a space for the passage of fuel from the conduit to the injector interface zone. Such a cylindrical element forming a nozzle can thus be fitted more easily into the bottom of the injection well than when it must be fitted into the conduit connecting the main chamber to the bottom of the injection well.

Selon un mode de réalisation, l'élément cylindrique est emmanché en force dans le fond du puits d'injection.According to one embodiment, the cylindrical element is force-fitted into the bottom of the injection well.

Selon un mode de réalisation, le fond du puits d'injection comporte un diamètre inférieur à celui de la zone d'interface injecteur. Ceci facilite l'emmanchement de l'élément cylindrique formant gicleur dans le fond du puits d'injection.According to one embodiment, the bottom of the injection well has a diameter smaller than that of the injector interface zone. This facilitates the fitting of the cylindrical element forming a nozzle into the bottom of the injection well.

Selon un mode de réalisation, le gicleur comprend au moins un premier canal et un deuxième canal débouchant l'un dans l'autre et débouchant respectivement en regard de la zone d'interface injecteur et en regard du conduit, le premier canal et le deuxième canal présentant un diamètre inférieur à celui du conduit.According to one embodiment, the nozzle comprises at least a first channel and a second channel opening into each other and opening respectively facing the injector interface zone and facing the conduit, the first channel and the second channel having a diameter smaller than that of the conduit.

Selon un mode de réalisation, le gicleur est en butée contre l'extrémité du puits d'injection. Ceci permet d'assurer un positionnement axial précis de l'élément cylindrique le long du premier axe.According to one embodiment, the nozzle abuts against the end of the injection well. This ensures precise axial positioning of the cylindrical element along the first axis.

Selon un mode de réalisation, l'élément cylindrique comporte des moyens de détrompage permettant de garantir un positionnement du gicleur par rapport au fond du puits d'injection dans une position relative telle que le deuxième canal soit dirigé en regard du conduit.According to one embodiment, the cylindrical element comprises keying means making it possible to guarantee positioning of the nozzle relative to the bottom of the injection well in a relative position such that the second channel is directed facing the conduit.

Selon un autre mode de réalisation, l'élément cylindrique ménage un espace de passage du carburant entre le conduit et une zone du fond ménagée entre l'élément cylindrique et une extrémité du puits d'injection, l'élément cylindrique comportant en outre un canal traversant orienté selon le premier axe, débouchant d'une part dans ladite zone du fond et, d'autre part dans la zone d'interface injecteur.According to another embodiment, the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a channel crossing oriented along the first axis, opening on the one hand into said bottom zone and, on the other hand, into the injector interface zone.

Selon un mode de réalisation, le canal traversant orienté selon le premier axe présente un diamètre inférieur à celui du conduit.According to one embodiment, the through channel oriented along the first axis has a diameter smaller than that of the conduit.

Selon un autre mode de réalisation, l'élément cylindrique ménage un espace de passage du carburant entre le conduit et une zone du fond ménagée entre l'élément cylindrique et une extrémité du puits d'injection, l'élément cylindrique comportant en outre un méplat ménageant entre l'élément cylindrique et une paroi du fond du puits d'injection un espace autorisant le passage du carburant de ladite zone du fond vers la zone d'interface injecteur.According to another embodiment, the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a flat providing a space between the cylindrical element and a bottom wall of the injection well allowing the passage of fuel from said bottom zone to the injector interface zone.

Brève description des figuresBrief description of the figures

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description suivante de plusieurs modes de réalisation particuliers de l'invention, donnés uniquement à titre illustratif et non limitatif, en référence aux dessins annexés.

  • La figure 1 est une vue en perspective d'un dispositif d'injection.
  • La figure 2 est une vue en coupe verticale selon le plan II-II du dispositif d'injection de la figure 1.
  • La figure 3 est une vue en coupe selon la plan III-III de la figure 2, représentant un puits d'injection.
  • La figure 4 est une vue similaire à celle de la figure 2 pour un dispositif d'injection selon un second mode de réalisation.
  • La figure 5 est une vue similaire à celle de la figure 2 pour un dispositif d'injection selon un troisième mode de réalisation.
  • La figure 6 est une vue similaire à celle de la figure 2 pour un dispositif d'injection selon un quatrième mode de réalisation.
  • La figure 7 est une vue similaire à celle de la figure 2 pour un dispositif d'injection selon un cinquième mode de réalisation.
  • La figure 8 est une vue en perspective du gicleur de la figure 7.
  • La figure 9 est une vue en coupe pour un dispositif d'injection selon un sixième mode de réalisation non couvert par les revendications .
The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely by way of illustration and not limitation. , with reference to the attached drawings.
  • There figure 1 is a perspective view of an injection device.
  • There figure 2 is a vertical sectional view along plane II-II of the injection device of the figure 1 .
  • There Figure 3 is a sectional view according to plan III-III of the figure 2 , representing an injection well.
  • There Figure 4 is a view similar to that of the figure 2 for an injection device according to a second embodiment.
  • There Figure 5 is a view similar to that of the figure 2 for an injection device according to a third embodiment.
  • There Figure 6 is a view similar to that of the figure 2 for an injection device according to a fourth embodiment.
  • There Figure 7 is a view similar to that of the figure 2 for an injection device according to a fifth embodiment.
  • There figure 8 is a perspective view of the nozzle of the Figure 7 .
  • There Figure 9 is a sectional view for an injection device according to a sixth embodiment not covered by the claims.

Description détaillée de modes de réalisationDetailed description of embodiments

La figure 1 représente un dispositif d'injection désigné dans son ensemble par la référence 1. Le dispositif d'injection 1 comprend une rampe commune 2 qui s'étend selon une direction longitudinale. La rampe commune 2 est creuse et définit ainsi une chambre principale 4 de forme tubulaire, illustrée sur la figure 2, s'étendant selon la direction longitudinale de la rampe commune 2. La rampe commune 2 est avantageusement réalisée d'un seul tenant, par exemple par un procédé de forgeage.There figure 1 represents an injection device designated as a whole by the reference 1. The injection device 1 comprises a common rail 2 which extends in a longitudinal direction. The common rail 2 is hollow and thus defines a main chamber 4 of tubular shape, illustrated in the figure 2 , extending in the longitudinal direction of the common rail 2. The common rail 2 is advantageously made in one piece, for example by a forging process.

La rampe commune 2 comporte un orifice d'entrée 3 débouchant dans la chambre principale 4 de la rampe commune 2 et destiné à être raccordé à un tube d'alimentation en carburant, non illustré.The common rail 2 includes an inlet orifice 3 opening into the main chamber 4 of the common rail 2 and intended to be connected to a fuel supply tube, not illustrated.

Par ailleurs, comme représenté sur la figure 2, la rampe commune 2 comporte des puits d'injection 5 qui sont chacun destinés à recevoir un injecteur 9, partiellement illustré sur la figure 2. Chacun des puits d'injection 5 s'étend selon un axe géométrique A. Les puits d'injection 5 sont déportés par rapport à la chambre principale 4. En d'autres termes, l'axe géométrique A de chaque puits d'injection 5 ne passe pas au travers de la chambre principale 4.Furthermore, as shown in the figure 2 , the common rail 2 comprises injection wells 5 which are each intended to receive an injector 9, partially illustrated in the figure 2 . Each of the injection wells 5 extends along a geometric axis A. The injection wells 5 are offset relative to the main chamber 4. In other words, the geometric axis A of each injection well 5 does not pass through the main chamber 4.

Chaque puits d'injection 5 comporte un fond 5a et une zone d'interface injecteur 5b dans laquelle est montée l'injecteur 9. De manière avantageuse, le fond 5a comme la zone d'interface injecteur 5b de chaque puits d'injection 5 présente une forme générale cylindrique.Each injection well 5 has a bottom 5a and an injector interface zone 5b in which the injector 9 is mounted. Advantageously, the bottom 5a like the injector interface zone 5b of each injection well 5 presents a general cylindrical shape.

La chambre principale 4 de la rampe commune 2 est reliée à chacun des puits d'injection 5 au moyen d'un conduit 6. Chaque conduit 6 présente une forme cylindrique s'étendant selon un axe B qui est sécant à l'axe A. Chaque conduit 6 débouche, d'une part, dans la chambre principale 4, et, d'autre part, dans le fond 5a de l'un des puits d'injection 5 et permet ainsi de conduire le carburant de la chambre principale 4 vers ledit puits d'injection 5. Dans le mode de réalisation représenté sur la figure 2, le conduit 6 débouche latéralement, c'est-à-dire au niveau de la paroi périphérique du fond 5a du puits d'injection 5.The main chamber 4 of the common rail 2 is connected to each of the injection wells 5 by means of a conduit 6. Each conduit 6 has a cylindrical shape extending along an axis B which intersects the axis A. Each leads 6 opens, on the one hand, into the main chamber 4, and, on the other hand, into the bottom 5a of one of the injection wells 5 and thus makes it possible to conduct the fuel from the main chamber 4 towards said well. injection 5. In the embodiment shown on the figure 2 , the conduit 6 opens laterally, that is to say at the level of the peripheral wall of the bottom 5a of the injection well 5.

Compte-tenu du caractère déporté des puits d'injection 5 par rapport à la chambre principale 4, chaque conduit 6 est usiné transversalement à l'axe longitudinal de la rampe commune 2 et par le côté de la rampe commune 2 opposé aux puits d'injection 5. Ainsi, pour former chaque conduit 6, un perçage 7 traversant est nécessairement formé, dans la rampe commune 2, en regard dudit conduit 6. Le perçage 7 s'étend coaxialement à l'axe géométrique B du conduit 6. Le diamètre du conduit 6 est par exemple compris entre 3 et 5 mm. Dans le mode de réalisation représenté, l'axe B passe par l'axe central de la chambre principale 4. Le perçage 7 est destiné à être obturé de manière étanche au moyen d'un dispositif d'obturation, non représenté.Taking into account the offset nature of the injection wells 5 relative to the main chamber 4, each conduit 6 is machined transversely to the longitudinal axis of the common rail 2 and from the side of the common rail 2 opposite the injection wells. injection 5. Thus, to form each conduit 6, a through bore 7 is necessarily formed, in the common rail 2, facing said conduit 6. The bore 7 extends coaxially to the geometric axis B of the conduit 6. The diameter of conduit 6 is for example between 3 and 5 mm. In the embodiment shown, the axis B passes through the central axis of the main chamber 4. The bore 7 is intended to be sealed in a sealed manner by means of a closing device, not shown.

Par ailleurs, le dispositif d'injection 1 comporte un gicleur 8 ménagé dans le fond 5a de chacun des puits d'injection 5. Le gicleur 8 vise à réduire la section de passage du carburant entre le conduit 6 et la zone d'interface injecteur 5b du puits d'injection 5. Le gicleur 8 génère ainsi une perte de charge qui permet d'amortir les ondes de pression.Furthermore, the injection device 1 comprises a nozzle 8 provided in the bottom 5a of each of the injection wells 5. The nozzle 8 aims to reduce the fuel passage section between the conduit 6 and the injector interface zone 5b of the injection well 5. The nozzle 8 thus generates a pressure loss which makes it possible to dampen the pressure waves.

Dans le premier mode de réalisation représenté sur les figures 2 et 3, le gicleur 8 est un élément cylindrique qui est emmanché en force dans le fond 5a du puits d'injection 5. Le gicleur 8 est par exemple en acier inoxydable. Afin de permettre un tel emmanchement du gicleur 8 dans le fond 5a du puits d'injection 5, le fond 5a présente un diamètre inférieur à celui de la zone d'interface injecteur 5b.In the first embodiment shown on the figure 2 And 3 , the nozzle 8 is a cylindrical element which is force-fitted into the bottom 5a of the injection well 5. The nozzle 8 is for example made of stainless steel. In order to allow such fitting of the nozzle 8 in the bottom 5a of the injection well 5, the bottom 5a has a diameter smaller than that of the injector interface zone 5b.

Par ailleurs, le gicleur 8 comporte une portion tronconique 20 qui est positionnée, le long de l'axe A, en regard du conduit 6 et qui permet ainsi au carburant de pénétrer dans le fond 5a du puits d'injection 5 , et plus particulièrement dans une zone située entre l'extrémité 11 du puits d'injection 5 et le gicleur 8. Le gicleur 8 comporte également un canal 10, traversant, qui est orienté selon l'axe A du puits d'injection 5 et permet ainsi de conduire le carburant de la zone précitée du fond 5a du puits d'injection 5 vers la zone d'interface injecteur 5b. Dans le mode de réalisation représenté, le canal 10 traverse le gicleur 8 en son centre.Furthermore, the nozzle 8 comprises a frustoconical portion 20 which is positioned, along the axis A, facing the conduit 6 and which thus allows the fuel to penetrate into the bottom 5a of the injection well 5, and more particularly in a zone located between the end 11 of the injection well 5 and the nozzle 8. The nozzle 8 also includes a through channel 10, which is oriented along the axis A of the injection well 5 and thus makes it possible to conduct the fuel from the aforementioned bottom zone 5a from the injection well 5 towards the injector interface zone 5b. In the embodiment shown, channel 10 passes through nozzle 8 at its center.

Les modes de réalisations illustrés sur les figures 4 à 7 ne diffèrent du mode de réalisation décrit ci-dessus en relation avec les figures 2 et 3 que par la structure du gicleur 8.The embodiments illustrated on the figures 4 to 7 do not differ from the embodiment described above in relation to the figures 2 And 3 than by the structure of the nozzle 8.

Dans le mode de réalisation de la figure 4, le gicleur 8 comporte un canal 10 traversant qui est orienté selon l'axe A du puits d'injection 5 et qui traverse ledit gicleur 8. Le gicleur 8 comporte en outre un ou plusieurs canaux 13 transversaux qui traversent le gicleur 8 radialement. Les canaux 13 passent au travers du canal 10 et sont avantageusement perpendiculaires audit canal 10. Le gicleur 8 est orienté dans le fond 5a du puits d'injection 5 de sorte que l'un des canaux 13 débouche en regard du conduit 6. Grâce à la pluralité des canaux 13, il existe un plus grand nombre de positions permettant d'assurer un positionnement relatif du gicleur 8 par rapport au puits d'injection 5 dans lequel l'un des canaux 13 débouche en regard du conduit 6. En outre, selon une variante de réalisation avantageuse, le gicleur 8 comporte des moyens de détrompage permettant de garantir un positionnement du gicleur 8 dans une position relative telle que l'un des canaux 13 soit dirigé en regard du conduit 6. Selon un mode de réalisation, les moyens de détrompage sont formés par une indication visuelle ménagée sur la surface inférieure du gicleur 8. Selon un autre mode de réalisation, afin de réaliser de tels moyens de détrompage, le fond 5a du puits d'injection et le gicleur 8 présentent chacun une singularité géométrique complémentaire permettant d'assurer un détrompage mécanique.In the embodiment of the figure 4 , the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8. The nozzle 8 further comprises one or more transverse channels 13 which pass through the nozzle 8 radially. The channels 13 pass through the channel 10 and are advantageously perpendicular to said channel 10. The nozzle 8 is oriented in the bottom 5a of the injection well 5 so that one of the channels 13 opens facing the conduit 6. Thanks to the plurality of channels 13, there is a greater number of positions making it possible to ensure relative positioning of the nozzle 8 relative to the injection well 5 in which one of the channels 13 opens facing the conduit 6. In addition, according to an advantageous alternative embodiment, the nozzle 8 comprises keying means making it possible to guarantee positioning of the nozzle 8 in a relative position such that one of the channels 13 is directed facing the conduit 6. According to one embodiment, the coding means are formed by a visual indication provided on the lower surface of the nozzle 8. According to another embodiment, in order to produce such coding means, the bottom 5a of the injection well and the nozzle 8 each have a singularity complementary geometry to ensure mechanical keying.

Dans le mode de réalisation de la figure 5, le gicleur 8 comporte un canal 10 traversant qui est orienté selon l'axe A du puits d'injection 5 et qui traverse ledit gicleur 8. Le gicleur 8 comporte en outre un canal 15 borgne qui est orienté, selon une orientation radiale à l'axe A, perpendiculairement audit canal 10. D'une part, le canal 15 débouche en regard du conduit 6 et, d'autre part, il rejoint le canal 10 de sorte à autoriser le passage du carburant du conduit 6 vers la zone d'interface injecteur 5b du puits d'injection 5. Selon une variante avantageuse, le gicleur 8 comporte des moyens de détrompage, tels que décrits ci-dessus, permettant de garantir un positionnement du gicleur dans une position telle que le canal 15 soit dirigé en regard du conduit 6.In the embodiment of the Figure 5 , the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8. The nozzle 8 further comprises a blind channel 15 which is oriented in a radial orientation at the axis A, perpendicular to said channel 10. On the one hand, channel 15 opens opposite conduit 6 and, on the other hand, it joins channel 10 so as to allow the passage of fuel from conduit 6 towards the zone d injector interface 5b of the injection well 5. According to an advantageous variant, the nozzle 8 comprises keying means, as described above, making it possible to guarantee positioning of the nozzle in a position such that the channel 15 is directed in view of conduit 6.

Dans le mode de réalisation de la figure 6, le gicleur 8 comporte un canal 16 qui est orienté selon l'axe A. Le canal 16 est borgne, c'est-à-dire qu'il débouche uniquement en regard de la zone d'interface injecteur 5b du puits d'injection 5a. Le gicleur 8 comporte en outre un autre canal 15, borgne également, qui est orienté, selon une orientation radiale à l'axe A, perpendiculairement audit canal 16. Le canal 15 débouche en regard du conduit 6 et rejoint le canal 16 de sorte à permettre le passage du carburant du conduit 6 vers la zone d'interface injecteur 5b du puits d'injection 5.In the embodiment of the Figure 6 , the nozzle 8 comprises a channel 16 which is oriented along the axis A. The channel 16 is blind, that is to say it only opens opposite the injector interface zone 5b of the injection well 5a. The nozzle 8 further comprises another channel 15, also blind, which is oriented, in a radial orientation to the axis A, perpendicular to said channel 16. The channel 15 opens opposite the conduit 6 and joins the channel 16 so as to allow the passage of fuel from conduit 6 to the injector interface zone 5b of the injection well 5.

Le gicleur 8 est également susceptible de comporter des moyens de détrompage. En outre, dans ce mode de réalisation, le gicleur 8 vient en butée contre l'extrémité 11 du puits d'injection 5, ce qui permet d'assurer un positionnement correct du gicleur 8, et plus particulièrement du canal 15, le long de l'axe A.The nozzle 8 is also likely to include keying means. Furthermore, in this embodiment, the nozzle 8 abuts against the end 11 of the injection well 5, which ensures correct positioning of the nozzle 8, and more particularly of the channel 15, along the A axis.

Dans les modes de réalisation des figures 2 à 6, les canaux 10, 13, 15, 16 présentent un diamètre inférieur à celui du conduit 6 afin de générer une perte de charge. A titre d'exemple, leur diamètre est compris entre 0.75 à 1.5 mm. Dans le mode de réalisation illustré sur les figures 7 et 8, le gicleur 8 est dépourvu de canal mais comporte un méplat 8c s'étendant sur toute la longueur dudit gicleur 8.Comme représenté sur la figure 7, le gicleur 8 est emmanché dans le fond 5a du puits d'injection 5 de manière à conserver un espace 18 entre le conduit 6 et une zone située entre l'extrémité 11 du puits d'injection 5 et le gicleur 8. Le méplat 8c permet ainsi de ménager entre le gicleur 8 et la paroi cylindrique du fond 5a du puits d'injection 5 un espace 19 autorisant le passage du carburant vers la zone d'interface injecteur 5b.In the embodiments of figures 2 to 6 , the channels 10, 13, 15, 16 have a diameter smaller than that of the conduit 6 in order to generate a pressure loss. For example, their diameter is between 0.75 to 1.5 mm. In the embodiment illustrated on the figures 7 And 8 , the nozzle 8 does not have a channel but has a flat 8c extending over the entire length of said nozzle 8. As shown in the Figure 7 , the nozzle 8 is fitted into the bottom 5a of the injection well 5 so as to maintain a space 18 between the conduit 6 and a zone located between the end 11 of the injection well 5 and the nozzle 8. The flat 8c thus makes it possible to provide between the nozzle 8 and the cylindrical wall of the bottom 5a of the injection well 5 a space 19 authorizing the passage of fuel towards the injector interface zone 5b.

Selon un sixième mode de réalisation représenté sur la figure 9, l'axe A du puits d'injection 5 passe par le conduit 6 de sorte que le fond 5a du puits d'injection 5 débouche dans le conduit 6. Le fond 5a du puits d'injection 5 qui met en communication la zone d'interface injecteur 5b avec le conduit 6 présente un diamètre inférieur à celui du conduit 6 et à celui de la zone d'interface injecteur 5b. Ainsi, c'est ici le fond 5a du puits d'injection 5a qui forme le gicleur 8 générant une perte de charge permettant d'amortir les ondes de pression. Le diamètre du fond 5a du puits d'injection 5 est par exemple compris entre 0.75 à 1.5 mm.According to a sixth embodiment shown on the Figure 9 , the axis A of the injection well 5 passes through the conduit 6 so that the bottom 5a of the injection well 5 opens into the conduit 6. The bottom 5a of the injection well 5 which communicates the zone d The injector interface 5b with the conduit 6 has a diameter smaller than that of the conduit 6 and that of the injector interface zone 5b. Thus, it is here the bottom 5a of the injection well 5a which forms the nozzle 8 generating a pressure loss making it possible to dampen the pressure waves. The diameter of the bottom 5a of the injection well 5 is for example between 0.75 to 1.5 mm.

Bien que l'invention ait été décrite en liaison avec plusieurs modes de réalisation particuliers, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention qui est définie par les revendications.Although the invention has been described in connection with several particular embodiments, it is quite obvious that it is in no way limited and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention which is defined by the claims.

L'usage du verbe « comporter », « comprendre » ou « inclure » et de ses formes conjuguées n'exclut pas la présence d'autres éléments ou d'autres étapes que ceux énoncés dans une revendication.The use of the verb “include”, “understand” or “include” and its conjugated forms does not exclude the presence of other elements or other steps than those set out in a claim.

Dans les revendications, tout signe de référence entre parenthèses ne saurait être interprété comme une limitation de la revendication.In the claims, any parenthetical reference sign shall not be construed as a limitation of the claim.

Claims (6)

  1. An injection device (1) comprising a common rail (2) extending in a longitudinal direction and defining a main chamber (4), the common rail (2) comprising:
    - an inlet orifice (3) emerging in the main chamber (4) and intended to be coupled to a fuel supply pipe,
    - at least one injection well (5) extending along a first axis, said injection well (5) comprising a bottom (5a) and an injector interface zone (5b) in which an injector (9) is intended to be mounted;
    - at least one transverse duct (6) extending along a second axis and emerging in the main chamber (4), on the one hand, and in the bottom (5a) of the injection well (5), on the other hand, so as to link the main chamber (4) to said injection well (5), the first and the second axes being secant; and
    - a spray nozzle (8) arranged in the bottom (5a) of the injection well (5) and reducing the section of passage of the fuel between the duct (6) and the injector interface zone (5b) of the injection well (5), and being thus configured to generates a pressure drop which makes it possible to damp the pressure waves, the injection device being characterized in that the spray nozzle (8) is a cylindrical element which is force fitted into the bottom (5a) of the injection well (5) and which forms a space (10, 13, 15, 16, 18, 19) for passage of the fuel from the duct (6) to the injector interface zone (5b).
  2. The device (1) as claimed in claim 1, wherein the bottom (5a) of the injection well (5) has a diameter smaller than that of the injector interface zone (5b).
  3. The device (1) as claimed in claim 1 or 2, wherein the spray nozzle (8) comprises at least one first channel (10, 16) and one second channel (13, 15) one emerging in the other and emerging respectively opposite the injector interface zone (5b) and facing the duct (6), the first channel and the second channel having a diameter smaller than that of the duct (6).
  4. The device (1) as claimed in claim 3, wherein the spray nozzle (8) is in abutment against the end (11) of the injection well (5).
  5. The device (1) as claimed in claim 1 or 2, wherein the cylindrical element forms a space for passage of the fuel between the duct (6) and a zone of thebottom (5a) formed between the cylindrical element and an end (11) of the injection well (5), the cylindrical element further comprising a through-channel (10) oriented along the first axis, emerging, on the one hand, in said zone of the bottom (5a) and, on the other hand, in the injector interface zone (5b).
  6. The device (1) as claimed in claim 1 or 2, wherein the cylindrical element forms a space for passage of the fuel between the duct (6) and a zone of the bottom (5a) formed between the cylindrical element and an end (11) of the injection well (5), the cylindrical element further comprising a flat (8c) forming, between the cylindrical element and a wall of the bottom (5a) of the injection well (5), a space (19) allowing the passage of the fuel from said zone of the bottom (5a) to the injector interface zone (5b).
EP19752733.6A 2018-07-16 2019-07-15 Common-rail injection device Active EP3824174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1856543A FR3083830B1 (en) 2018-07-16 2018-07-16 COMMON RAMP INJECTION DEVICE
PCT/FR2019/051770 WO2020016513A1 (en) 2018-07-16 2019-07-15 Common-rail injection device

Publications (2)

Publication Number Publication Date
EP3824174A1 EP3824174A1 (en) 2021-05-26
EP3824174B1 true EP3824174B1 (en) 2023-09-13

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EP19752733.6A Active EP3824174B1 (en) 2018-07-16 2019-07-15 Common-rail injection device

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EP (1) EP3824174B1 (en)
JP (1) JP2021535322A (en)
FR (1) FR3083830B1 (en)
WO (1) WO2020016513A1 (en)

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JP2003528254A (en) * 2000-03-21 2003-09-24 シーメンス アクチェンゲゼルシャフト Fuel injector assembly for alignably mounting a fuel injector to a fuel rail
JP2001349266A (en) * 2000-06-08 2001-12-21 Toyota Motor Corp Fuel injection valve
JP3694228B2 (en) * 2000-09-18 2005-09-14 株式会社オティックス Delivery pipe
JP2006233858A (en) * 2005-02-24 2006-09-07 Denso Corp Common rail type fuel injection device
DE102005061882A1 (en) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Pressure oscillation dampening assembly for automotive fuel injection system has press-fit throttle tubes with transverse drill holes
DE102007049357A1 (en) * 2007-10-15 2009-04-16 Robert Bosch Gmbh Fuel injection device
JP5823336B2 (en) * 2012-04-04 2015-11-25 株式会社オティックス Fuel distribution pipe
DE102012206241A1 (en) * 2012-04-17 2013-10-17 Robert Bosch Gmbh Device for holding down a valve for metering fuel
DE102013203537A1 (en) * 2013-03-01 2014-09-04 Robert Bosch Gmbh Internal combustion engine has cylinder head closing combustion chamber and valve inserted in cylinder head for injection of fluid fuel into combustion chamber, where fixing device is effective between cylinder head and valve

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WO2020016513A1 (en) 2020-01-23
EP3824174A1 (en) 2021-05-26
FR3083830B1 (en) 2021-10-01
FR3083830A1 (en) 2020-01-17
JP2021535322A (en) 2021-12-16

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