EP1460264B1 - Fuel injection system for internal combustion engine, particularly for a motor vehicle - Google Patents

Fuel injection system for internal combustion engine, particularly for a motor vehicle Download PDF

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Publication number
EP1460264B1
EP1460264B1 EP04290554A EP04290554A EP1460264B1 EP 1460264 B1 EP1460264 B1 EP 1460264B1 EP 04290554 A EP04290554 A EP 04290554A EP 04290554 A EP04290554 A EP 04290554A EP 1460264 B1 EP1460264 B1 EP 1460264B1
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EP
European Patent Office
Prior art keywords
cannula
injector
bore
fact
injection nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04290554A
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German (de)
French (fr)
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EP1460264A1 (en
Inventor
Alain Bredeka
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication of EP1460264A1 publication Critical patent/EP1460264A1/en
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Publication of EP1460264B1 publication Critical patent/EP1460264B1/en
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    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on 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
    • 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
    • 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
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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

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

Abstract

The device has a longitudinal body (11) for each injector (40). A tube (20) connects the injector with a corresponding nozzle (13) of a ramp (10). The ramp and an electrical connection with a connector are joined to a control computer of an engine. The tube has two ends with a knuckle and a blocking unit in a joining position to form an inseparable assembly having the ramp, tube and injector.

Description

La présente invention concerne un dispositif d'injection de carburant pour moteur à combustion interne, notamment pour un véhicule automobile, voir par example US 6 564 755 B.The present invention relates to a fuel injection device for an internal combustion engine, especially for a motor vehicle, see for example US 6 564 755 B.

Les moteurs à combustion interne comportent des injecteurs de carburant qui sont reliés, d'une part, à une rampe d'alimentation de carburant et, d'autre part, à des moyens de raccordement électrique avec un calculateur de contrôle du moteur.Internal combustion engines comprise fuel injectors which are connected, on the one hand, to a fuel supply ramp and, on the other hand, to electrical connection means with an engine control computer.

Chaque injecteur comporte une extrémité inférieure d'injection, une extrémité supérieure d'alimentation destinée à être raccordée à la rampe d'alimentation de carburant et un connecteur relié par des câbles électriques à une bobine électromagnétique disposée à l'intérieur de l'injecteur et commandant le déplacement de l'aiguille de cet injecteur.Each injector comprises a lower injection end, an upper supply end intended to be connected to the fuel supply rail and a connector connected by electric cables to an electromagnetic coil disposed inside the injector and controlling the displacement of the needle of this injector.

La rampe d'alimentation comporte des buses parallèles et s'étendant sensiblement perpendiculairement à l'axe longitudinal de la rampe, chacune de ces buses étant destinée à s'emboîter sur l'extrémité d'alimentation d'un injecteur.The feed ramp comprises parallel nozzles and extending substantially perpendicular to the longitudinal axis of the ramp, each of these nozzles being intended to fit on the feed end of an injector.

Généralement, les injecteurs sont tout d'abord montés sur la culasse du moteur et la rampe d'alimentation est ensuite montée en plaçant chaque buse directement sur une extrémité supérieure d'un injecteur ou en intercalant une douille entre la buse et l'extrémité supérieure de chaque injecteur.Generally, the injectors are first mounted on the cylinder head of the engine and the feed ramp is then mounted by placing each nozzle directly on an upper end of an injector or by interposing a bushing between the nozzle and the upper end. of each injector.

Pour obtenir un bon rendement du moteur à combustion interne et lutter efficacement contre la pollution, chaque injecteur doit avoir une position précise dans la culasse. Ainsi, lors du montage ou à chaque intervention en service après-vente, la position de chaque injecteur doit être réglée avec précision ce qui entraîne des opérations fastidieuses et multiplie de ce fait les risques d'un mauvais réglage.To obtain a good performance of the internal combustion engine and effectively fight against pollution, each injector must have a precise position in the cylinder head. Thus, during assembly or after each service intervention, the position of each injector must be adjusted precisely which leads to tedious operations and therefore increases the risk of a bad adjustment.

L'invention a pour but d'éviter ces inconvénients en proposant un dispositif d'injection de carburant qui est particulièrement simple à installer sur les moteurs à combustion interne.The invention aims to avoid these disadvantages by providing a fuel injection device which is particularly simple to install on internal combustion engines.

L'invention a donc pour objet un dispositif d'injection de carburant pour moteur à combustion interne, notamment dans un véhicule automobile, du type comprenant une rampe d'alimentation en carburant comportant un corps longitudinal et, pour chaque injecteur, une buse s'étendant sensiblement perpendiculairement à l'axe du corps et une liaison électrique avec un connecteur destiné à être raccordé à un calculateur de contrôle du moteur, caractérisé en ce qu'il comprend, pour chaque injecteur, une canule de raccordement dudit injecteur avec la buse correspondante de la rampe et comportant, à chacune de ses extrémités, une rotule et un organe de blocage en position de raccordement pour former un ensemble indémontable comprenant la rampe, les canules et les injecteurs.The subject of the invention is therefore a fuel injection device for an internal combustion engine, in particular in a motor vehicle, of the type comprising a fuel supply ramp comprising a longitudinal body and, for each injector, a nozzle extending substantially perpendicularly to the axis of the body and an electrical connection with a connector intended to be connected to a control computer of the engine, characterized in that it comprises, for each injector, a cannula for connecting said injector with the corresponding nozzle of the ramp and having, at each of its ends, a ball and a locking member in the connecting position to form a releasable assembly comprising the ramp, the cannulas and the injectors.

Selon d'autres caractéristiques de l'invention :

  • chaque extrémité de la canule est pourvue d'un élément d'étanchéité avec l'extrémité de la buse ou de l'injecteur,
  • chaque buse comporte, à son extrémité de raccordement avec la canule, un alésage de positionnement d'une extrémité de ladite canule et comprenant un fond hémisphérique et une entrée munie d'un chanfrein,
  • l'alésage de la buse comporte une gorge destinée à coopérer avec l'organe de blocage de la canule,
  • chaque injecteur comporte, à son extrémité de raccordement avec la canule, un alésage de positionnement d'une extrémité de ladite canule et comprenant un fond hémisphérique et une entrée munie d'un chanfrein,
  • l'alésage de la buse comporte une gorge destinée à coopérer avec l'organe de blocage de la canule,
  • l'alésage de chaque buse présente une forme identique à l'alésage de chaque injecteur,
  • chaque extrémité de la canule comprend une portion cylindrique de forme complémentaire à l'alésage de la buse ou de l'injecteur, ladite portion cylindrique comportant une surface d'extrémité hémisphérique formant avec le fond hémisphérique de l'alésage de la buse ou de l'injecteur ladite rotule,
  • l'organe de blocage à chaque extrémité de la canule est formé par un anneau élastique monté dans une rainure ménagée dans ladite extrémité et déplaçable entre une position escamotée dans la rainure lors de l'introduction de la portion cylindrique dans l'alésage de la buse ou de l'injecteur et une position en saillie dans la gorge dudit alésage pour le blocage de la canule,
  • l'élément d'étanchéité comprend un joint torique maintenu par une rondelle anti-extrusion dans une rainure ménagée dans la portion cylindrique de chaque extrémité de la canule,
  • la rampe, les canules et les extrémités supérieures de chaque injecteur sont surmoulées dans une matière plastique dans laquelle est noyée la liaison électrique de chaque injecteur.
According to other features of the invention:
  • each end of the cannula is provided with a sealing element with the end of the nozzle or the injector,
  • each nozzle has, at its connection end with the cannula, a positioning bore of an end of said cannula and comprising a hemispherical bottom and an inlet provided with a chamfer,
  • the bore of the nozzle comprises a groove intended to cooperate with the blocking member of the cannula,
  • each injector comprises, at its connection end with the cannula, a positioning bore of an end of said cannula and comprising a hemispherical bottom and an inlet provided with a chamfer,
  • the bore of the nozzle comprises a groove intended to cooperate with the blocking member of the cannula,
  • the bore of each nozzle has a shape identical to the bore of each injector,
  • each end of the cannula comprises a cylindrical portion of complementary shape to the bore of the nozzle or the injector, said cylindrical portion having a hemispherical end surface forming with the hemispherical bottom of the bore of the nozzle or the nozzle. injector said ball joint,
  • the locking member at each end of the cannula is formed by a resilient ring mounted in a groove formed in said end and movable between a retracted position in the groove during the introduction of the cylindrical portion into the bore of the nozzle or the injector and a position protruding into the groove of said bore for blocking the cannula,
  • the sealing member comprises an O-ring held by an anti-extrusion washer in a groove in the cylindrical portion of each end of the cannula,
  • the ramp, the cannulas and the upper ends of each injector are overmolded in a plastic material in which is embedded the electrical connection of each injector.

Les caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, donnés à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :

  • la figure 1 est une vue schématique en perspective d'un dispositif d'injection conforme à l'invention, avant montage sur un moteur à combustion interne,
  • la figure 2 est une vue schématique en coupe transversale d'une rampe du dispositif d'injection conforme à l'invention,
  • la figure 3 est une vue schématique en coupe axiale de la partie supérieure d'un injecteur du dispositif d'injection conforme à l'invention,
  • la figure 4 est une vue schématique en coupe axiale d'une canule du dispositif d'injection conforme à l'invention,
  • la figure 5 est une vue schématique en coupe transversale d'une culasse d'un moteur à combustion interne équipée d'un dispositif d'injection conforme à l'invention.
The features and advantages of the invention will become apparent from the following description, given by way of example and with reference to the appended drawings, in which:
  • FIG. 1 is a schematic perspective view of an injection device according to the invention, before mounting on an internal combustion engine,
  • FIG. 2 is a diagrammatic cross-sectional view of a ramp of the injection device according to the invention;
  • FIG. 3 is a diagrammatic view in axial section of the upper part of an injector of the injection device according to the invention,
  • FIG. 4 is a diagrammatic view in axial section of a canula of the injection device according to the invention,
  • Figure 5 is a schematic cross-sectional view of a cylinder head of an internal combustion engine equipped with an injection device according to the invention.

Sur la figure 1, on a représenté schématiquement en perspective un dispositif d'injection désigné dans son ensemble par la référence 1 et qui est destiné à alimenter des injecteurs 40 d'un moteur à combustion interne en carburant et en énergie électrique.FIG. 1 diagrammatically shows in perspective an injection device designated as a whole by the reference numeral 1 and which is intended to supply injectors 40 of an internal combustion engine with fuel and electrical energy.

Dans l'exemple de réalisation représenté à la figure 1, le dispositif d'injection comprend quatre injecteurs 40 comportant chacun une extrémité inférieure 41 d'injection et une extrémité supérieure 42 d'alimentation destinée à être raccordée à une rampe 10 d'injection de carburant.In the exemplary embodiment shown in FIG. 1, the injection device comprises four injectors 40 each comprising a lower injection end 41 and an upper supply end 42 intended to be connected to an injection ramp 10. fuel.

Ainsi que montré sur les figures 1 et 2, la rampe d'alimentation 10 comprend un corps longitudinal 11 percé d'un conduit axial 12 destiné à être raccordé à une canalisation, non représentée, d'alimentation en carburant. La rampe 10 comporte également quatre buses 13 s'étendant parallèlement les unes aux autres et sensiblement perpendiculairement à l'axe longitudinal du corps 11 de ladite rampe 10. Chaque buse 13 est percée d'un canal 14 qui débouche à une extrémité 14a dans le conduit axial 12 et à une autre extrémité 14b dans un alésage 15 ménagé à l'extrémité libre de la buse 13 correspondante.As shown in Figures 1 and 2, the feed ramp 10 comprises a longitudinal body 11 pierced with an axial duct 12 to be connected to a pipe, not shown, for supplying fuel. The ramp 10 also comprises four nozzles 13 extending parallel to each other and substantially perpendicular to the longitudinal axis of the body 11 of said ramp 10. Each nozzle 13 is pierced with a channel 14 which opens at one end 14a in the axial duct 12 and at another end 14b in a bore 15 formed at the free end of the corresponding nozzle 13.

En se reportant maintenant à la figure 2, on va décrire un alésage 15 d'une buse 13, l'alésage de chacune des autres buses étant identique.Referring now to FIG. 2, a bore 15 of a nozzle 13 will be described, the bore of each of the other nozzles being identical.

Ainsi que représenté sur cette figure, l'alésage 15 comporte, de l'extrémité 14b du canal 14 jusqu'à l'extrémité libre de la buse 13, un fond 15a hémisphérique, une première portion cylindrique 15b, une seconde portion cylindrique 15c de plus grand diamètre que la première portion cylindrique 15b et une entrée munie d'un chanfrein 15d. La seconde portion cylindrique 15c est pourvue d'une gorge 16.As shown in this figure, the bore 15 comprises, from the end 14b of the channel 14 to the free end of the nozzle 13, a hemispherical bottom 15a, a first cylindrical portion 15b, a second cylindrical portion 15c of larger diameter than the first cylindrical portion 15b and an inlet provided with a chamfer 15d. The second cylindrical portion 15c is provided with a groove 16.

En se reportant à la figure 3, on va décrire une extrémité supérieure 42 d'un injecteur 40 destiné à être raccordé à la rampe 10, l'extrémité supérieure de chacun des autres injecteurs étant semblable.Referring to Figure 3, we will describe an upper end 42 of an injector 40 to be connected to the ramp 10, the upper end of each of the other injectors being similar.

Cette extrémité supérieure 42 de l'injecteur 40 comporte un alésage 43 comprenant un fond 43a hémisphérique, une première portion cylindrique 43b, une seconde portion cylindrique 43c de plus grand diamètre que la première portion cylindrique 43b et une entrée munie d'un chanfrein 43d. La seconde portion cylindrique 43c comporte une gorge 44.This upper end 42 of the injector 40 comprises a bore 43 comprising a hemispherical bottom 43a, a first cylindrical portion 43b, a second cylindrical portion 43c of larger diameter than the first cylindrical portion 43b and an inlet provided with a chamfer 43d. The second cylindrical portion 43c has a groove 44.

Ainsi, l'alésage 15 de chaque buse 13 de la rampe 10 présente une forme identique à l'alésage 43 de chaque injecteur 40.Thus, the bore 15 of each nozzle 13 of the ramp 10 has a shape identical to the bore 43 of each injector 40.

Le dispositif d'injection comprend également, pour chaque injecteur 40, une canule 20 de raccordement de l'injecteur 40 avec la buse 13 de la rampe 10.The injection device also comprises, for each injector 40, a cannula 20 connecting the injector 40 with the nozzle 13 of the ramp 10.

D'une manière générale, chaque canule 20 comprend, à chacune de ses extrémités, une rotule et un organe de blocage en position de raccordement pour former un ensemble indémontable comprenant la rampe 10, les canules 20 et les injecteurs 40, comme on le verra ultérieurement.In general, each cannula 20 comprises, at each of its ends, a ball and a locking member in the connection position to form a releasable assembly comprising the ramp 10, the cannulas 20 and the injectors 40, as will be seen later.

En se reportant maintenant à la figure 4, on va décrire une canule 20, les autres canules étant identiques.Referring now to Figure 4, a cannula 20 will be described, the other cannulas being identical.

Ainsi que montré sur cette figure, la canule 20 est formée par un corps 21 de forme générale cylindrique percée d'un canal axial 22 débouchant à chaque extrémité dudit corps 21 et destiné à mettre en communication le canal 14 de la buse 13 avec l'injecteur 40 correspondant.As shown in this figure, the cannula 20 is formed by a body 21 of generally cylindrical shape pierced with an axial channel 22 opening at each end of said body 21 and intended to put in communication the channel 14 of the nozzle 13 with the corresponding injector 40.

Le corps 21 de la canule 20 comporte deux extrémités, respectivement 23 et 24 qui sont semblables, ce qui évite un sens de montage particulier de la canule 20 permettant ainsi de monter l'extrémité 23, soit dans l'alésage 15 de la buse 13, soit dans l'alésage 43 de l'injecteur 40 et l'extrémité 24, soit dans ledit alésage 15 ou dans ledit alésage 43.The body 21 of the cannula 20 has two ends, respectively 23 and 24 which are similar, which avoids a particular mounting direction of the cannula 20 thereby mounting the end 23, or in the bore 15 of the nozzle 13 , either in the bore 43 of the injector 40 and the end 24, or in said bore 15 or in said bore 43.

L'extrémité 23 du corps 21 de la canule 20 comprend une surface d'extrémité 23a hémisphérique et une portion cylindrique de forme complémentaire aux alésages 15 et 43, comportant une première partie 23b et une seconde partie 23c de plus grand diamètre que ladite première partie 23b.The end 23 of the body 21 of the cannula 20 comprises a hemispherical end surface 23a and a cylindrical portion of complementary shape to the bores 15 and 43, comprising a first portion 23b and a second portion 23c of larger diameter than said first portion. 23b.

La partie 23c est équipée d'un organe de blocage dans l'alésage 15 ou dans l'alésage 43 et qui est constituée par un anneau élastique 26, du type circlips monté dans une rainure 27. Cet anneau élastique 26 est, comme on le verra ultérieurement, déplaçable entre une position escamotée dans la rainure 27 lors du montage de la canule 20 et une position en saillie dans la gorge 16 ou 44 de l'alésage 15 ou 43.The portion 23c is equipped with a locking member in the bore 15 or in the bore 43 and which is constituted by an elastic ring 26 of the circlip type mounted in a groove 27. This elastic ring 26 is, as it is will see later, movable between a retracted position in the groove 27 during assembly of the cannula 20 and a projecting position in the groove 16 or 44 of the bore 15 or 43.

La première partie 23b de la portion cylindrique de l'extrémité 23 est aussi pourvue d'un élément d'étanchéité avec l'alésage 15 ou l'alésage 43 et qui est constitué par un joint torique 28 et une rondelle anti-extrusion 29 montée dans une rainure 30.The first part 23b of the cylindrical portion of the end 23 is also provided with a sealing element with the bore 15 or the bore 43 and which consists of an O-ring 28 and an anti-extrusion washer 29 mounted in a groove 30.

De manière identique, l'extrémité 24 du corps 21 de la canule 20 comporte une surface d'extrémité 24a hémisphérique et une portion cylindrique comprenant une première partie 24b et une seconde partie 24c de plus grand diamètre. La seconde partie 24c est pourvue d'un organe de blocage qui est formé par un anneau élastique 31 du type circlips monté dans une rainure 32 et déplaçable, comme on le verra ultérieurement, entre une position escamotée dans la rainure 32 lors de l'introduction de l'extrémité 24 de la canule 20 dans l'alésage 15 ou dans l'alésage 43 et une position en saillie dans la gorge 16 ou 44 pour le blocage de la canule 20.Similarly, the end 24 of the body 21 of the cannula 20 has a hemispherical end surface 24a and a cylindrical portion comprising a first portion 24b and a second portion 24c of larger diameter. The second portion 24c is provided with a locking member which is formed by an elastic ring 31 of the circlip type mounted in a groove 32 and movable, as will be seen later, between a retracted position in the groove 32 during the introduction of the end 24 of the cannula 20 in the bore 15 or in the bore 43 and a position protruding into the groove 16 or 44 for blocking the cannula 20.

La partie 24b de l'extrémité 24 de la canule 20 est équipée d'un élément d'étanchéité avec l'alésage 15 ou l'alésage 43 et qui est constitué par un joint torique 33 et une rondelle anti-extrusion 34 montée dans une rainure 35.The portion 24b of the end 24 of the cannula 20 is equipped with a sealing element with the bore 15 or the bore 43 and which consists of an O-ring 33 and an anti-extrusion washer 34 mounted in a groove 35.

L'assemblage de l'ensemble constitué par la rampe 10, les canules 20 et les injecteurs 40 est réalisé de la façon suivante.The assembly of the assembly consisting of the ramp 10, the cannulas 20 and the injectors 40 is made in the following manner.

Dans un but de simplification, on supposera que l'extrémité 23 de la canule 20 est destinée à être placée dans l'alésage 15 de la buse 13 et que l'extrémité 24 est destinée à être placée dans l'alésage 43 de l'injecteur 40. Mais, compte tenu de la symétrie des extrémités 23 et 24, l'inverse est également possible, ce qui évite tout sens de montage.For the purpose of simplification, it will be assumed that the end 23 of the cannula 20 is intended to be placed in the bore 15 of the nozzle 13 and that the end 24 is intended to be placed in the bore 43 of the injector 40. But, given the symmetry of the ends 23 and 24, the opposite is also possible, which avoids any sense of assembly.

L'extrémité 23 de la canule 20 est emboîtée dans l'alésage 15 de la buse 13 ce qui provoque, dans un premier temps, le déplacement de l'anneau élastique 26 en position rétractée par le chanfrein 15d ménagé à l'entrée de l'alésage 15, puis le déplacement de cet anneau élastique 26 dans une position en saillie lorsque cet anneau élastique 26 se trouve en vis-à-vis de la gorge 16. Dans cette position, la canule 20 est solidarisée de la rampe 10 et est indémontable du fait de l'inaccessibilité de l'anneau 26 de l'extérieur. L'étanchéité entre l'extrémité 23 de la canule 20 et l'alésage 15 de la buse 13 est réalisée par le joint torique 28.The end 23 of the cannula 20 is nested in the bore 15 of the nozzle 13 which causes, in a first step, the displacement of the elastic ring 26 in the retracted position by the chamfer 15d formed at the inlet of the nozzle. boring 15, then the displacement of this elastic ring 26 in a projecting position when the elastic ring 26 is opposite the groove 16. In this position, the cannula 20 is secured to the ramp 10 and is indémontable due to the inaccessibility of the ring 26 from the outside. The seal between the end 23 of the cannula 20 and the bore 15 of the nozzle 13 is formed by the O-ring 28.

Le contact de la surface d'extrémité hémisphérique 23a avec le fond 15a hémisphérique forme une rotule ce qui permet un débattement angulaire de la canule 20 par rapport à la buse 13.The contact of the hemispherical end surface 23a with the hemispherical bottom 15a forms a ball joint which allows an angular displacement of the cannula 20 with respect to the nozzle 13.

La même opération est renouvelée pour chaque canule 20 dans une buse 13 de la rampe 10.The same operation is repeated for each cannula 20 in a nozzle 13 of the ramp 10.

Ensuite, chaque injecteur 40 est monté sur une canule 20.Then, each injector 40 is mounted on a cannula 20.

Pour cela, l'extrémité 24 du corps 21 de la canule 20 est emboîtée dans l'alésage 43 ce qui entraîne, lors du coulissement, le déplacement de l'anneau élastique 31 par le chanfrein 43d de l'extrémité de l'alésage 43 entre une position escamotée dans la rainure 32 et une position en saillie lorsque cette rondelle 31 se trouve en vis-à-vis de la gorge 44 pour solidariser l'injecteur 40 avec la canule 20. Cet injecteur 40 est indémontable de la canule 20 du fait de l'inaccessibilité de l'anneau élastique 31 de l'extérieur.For this, the end 24 of the body 21 of the cannula 20 is nested in the bore 43 which causes, during sliding, the displacement of the elastic ring 31 by the chamfer 43d of the end of the bore 43 between a retracted position in the groove 32 and a projecting position when the washer 31 is vis-à-vis the groove 44 to secure the injector 40 with the cannula 20. This injector 40 is unmountable from the cannula 20 of the makes the inaccessibility of the elastic ring 31 from the outside.

L'étanchéité entre l'extrémité 24 de la canule 20 et l'alésage 43 de l'injecteur 40 est obtenue par le joint torique 33.The seal between the end 24 of the cannula 20 and the bore 43 of the injector 40 is obtained by the O-ring 33.

Le contact de la surface d'extrémité hémisphérique 24a avec le fond 43a hémisphérique forme une rotule ce qui permet un débattement angulaire de la canule 20 par rapport à la buse 13.The contact of the hemispherical end surface 24a with the hemispherical bottom 43a forms a ball joint which allows an angular displacement of the cannula 20 with respect to the nozzle 13.

La même opération est renouvelée pour chaque injecteur 40.The same operation is renewed for each injector 40.

Ainsi, l'ensemble formé par la rampe 10 comprenant le corps 11 et les buses 13, les canules 20 et les injecteurs 40 forment un ensemble cohérent et indémontable.Thus, the assembly formed by the ramp 10 comprising the body 11 and the nozzles 13, the cannulas 20 and the injectors 40 form a coherent and unmountable assembly.

La rampe 10, les canules 20 et les extrémités supérieures 42 des injecteurs 40 sont surmoulées dans une matière plastique 45, ainsi que montré aux figures 1 et 5. Sur la figure 1, la matière plastique 45 a été enlevée pour l'une des canules 20.The ramp 10, the cannulas 20 and the upper ends 42 of the injectors 40 are overmolded in a plastic material 45, as shown in FIGS. 1 and 5. In FIG. 1, the plastic material 45 has been removed for one of the cannulas 20.

Enfin, le dispositif d'injection comprend, pour chaque injecteur, une liaison électrique 46 noyée dans la matière plastique 45, raccordée à un connecteur électrique, non représenté, monté sur la rampe 15 et qui est lui-même destiné à être relié à un calculateur de contrôle du moteur à combustion interne.Finally, the injection device comprises, for each injector, an electrical connection 46 embedded in the plastic material 45, connected to an electrical connector, not shown, mounted on the ramp 15 and which is itself intended to be connected to a control computer of the internal combustion engine.

L'ensemble ainsi formé est monté dans une culasse A d'un moteur à combustion interne, ainsi que montré à la figure 5. Ce dispositif d'injection permet le montage des injecteurs 40 entre les deux arbres à cames B d'un moteur à combustion interne où le passage des mains pour la mise en place ou l'extraction de ces injecteurs est particulièrement difficile.The assembly thus formed is mounted in a cylinder head A of an internal combustion engine, as shown in FIG. 5. This injection device allows the injectors 40 to be mounted between the two camshafts B of an internal combustion engine where the passage of the hands for the introduction or the extraction of these injectors is particularly difficult. .

Comme montré sur cette figure 5, chaque injecteur 40 est positionné verticalement dans la culasse A et il repose sur des surfaces horizontales si bien que la précision de positionnement de chacun desdits injecteurs 40 est plus facile à tenir en fabrication en grande série.As shown in this figure 5, each injector 40 is positioned vertically in the cylinder head A and it rests on horizontal surfaces so that the positioning accuracy of each of said injectors 40 is easier to hold in mass production.

Le dispositif d'injection selon l'invention forme un ensemble monobloc, ce qui permet d'obtenir un ensemble correctement réglé et monté pour un bon rendement du moteur à combustion interne. La fiabilité s'en trouve accrue du fait qu'il n'est plus nécessaire de démonter en service après-vente les injecteurs et ceux-ci peuvent être appairés en première monte lors de la fabrication du moteur à combustion interne.The injection device according to the invention forms a one-piece assembly, which makes it possible to obtain a set that is correctly adjusted and mounted for a good efficiency of the internal combustion engine. The reliability is increased because it is no longer necessary to disassemble the after-sales service injectors and they can be paired in original equipment during the manufacture of the internal combustion engine.

La rotule entre chaque extrémité de la canule et respectivement la buse correspondante de la rampe et l'injecteur permet de corriger les écarts de tolérance entre axe entre la rampe d'injection et la culasse du moteur à combustion interne. Enfin, le dispositif d'injection selon l'invention présente l'avantage de n'avoir qu'une seule connexion électrique pour l'ensemble des injecteurs, ce qui permet d'obtenir un gain de temps au montage en série et une meilleure qualité.The ball between each end of the cannula and respectively the corresponding nozzle of the ramp and the injector makes it possible to correct the tolerance differences between axis between the injection rail and the cylinder head of the internal combustion engine. Finally, the injection device according to the invention has the advantage of having only one electrical connection for all the injectors, which makes it possible to obtain a saving of time during serial assembly and better quality. .

Claims (11)

  1. Fuel injection device for internal combustion engines, in particular for automotive vehicles, of a type which includes a fuel supply manifold which is made up of a longitudinal body (11) and, for each injector (40), an injection nozzle (13) which runs effectively perpendicular to the axis of the body (11) of the said manifold (10) and an electrical connection (46) with a connector designed to be connected to an engine management computer, characterised by the fact that it includes, for each injector (40), a cannula (20) connecting the aforementioned injector (40) with the corresponding injection nozzle (13) on the manifold (10) and which includes, at each of its extremities (23, 24), a ball joint (23a, 24a) and a device for locking the connection in position (26, 31) to form an assembly that cannot be dismantled made up of the manifold (10), the cannulae (20) and the injectors (40).
  2. Device as described in claim 1, characterised by the fact that each extremity (23, 24) of the cannula (20) is equipped with an element (28, 33) for forming a seal with the extremity of the injection nozzle (13) of the injector (40).
  3. Device as described in claim 1 or 2, characterised by the fact that at the end which connects it to the cannula (20) each injection nozzle includes a bore (15) for the location of one extremity (23, 24) of the said cannula (20), which has a hemispherical end (15a) and a chamfered entry (15d).
  4. Device as described in claim 3, characterised by the fact that the bore (15) in the injection nozzle has a groove (16) designed to fit with the device (26, 31) for locking the cannula (20) in position.
  5. Device as described in claim 1 or 2, characterised by the fact that at the end (42) which connects it with the cannula (20), each injector (40) has a bore (43) for the location of one extremity (23, 24) of the said cannula (20) and which includes a hemispherical end (43a) and a chamfered entry (43d).
  6. Device as described in claim 5, characterised by the fact that the bore (43) in the injection nozzle has a groove (44) designed to fit with the device (26, 31) for locking the cannula (20) in place.
  7. Device as described in any of claims 1 to 6 whatsoever, characterised by the fact that the bore (15) in each injection nozzle (13) has a shape which is identical to the bore (43) in each injector (40).
  8. Device as described in any of claims 1 to 7, characterised by the fact that each extremity (23, 24) of the cannula (20) includes a cylindrical portion (23b, 23c, 24b, 24c) whose shape complements that of the bore (15, 43) in the injection nozzle (13) or in the injector (40), with the aforementioned cylindrical portion including a hemispherical end surface (23a, 24a) which forms the aforementioned ball joint with the hemispherical end (15a, 43a) of the injection nozzle (13) or of the injector (40).
  9. Device as described in any of claims 1 to 8 whatsoever, characterised by the fact that the locking device at each end (23, 24) of the cannula (20) is formed by an elastic ring (26, 31) fitted in a groove (27, 32) made in the aforementioned extremity (23, 24), and which can be moved between a position in which it is retracted into the groove (25b, 30) during the in troduction of the cylindrical portion (23b, 23c; 24b, 24c) into the bore (15, 43) of the injection nozzle (13) or of the injector (40), and an position in which it protrudes into the groove (16, 44) in the aforementioned bore (15, 43) in order to lock the cannula (20) in place.
  10. Device as described in any of claims 1 to 9 whatsoever, characterised by the fact that the sealing element includes an o-ring (26, 31) held in place by an anti-extrusion washer (29, 34)) in a groove (30, 35) made in the cylindrical portion of each extremity (23, 24) of the cannula (20).
  11. Device as described in any of claims 1 to 10 whatsoever, characterised by the fact that the manifold (10), the cannulae (20) and the upper extremity (42) of each injector (40) are over-moulded in a plastic material (45) in which the electrical element (46) for each injector (40) is embedded.
EP04290554A 2003-03-19 2004-03-01 Fuel injection system for internal combustion engine, particularly for a motor vehicle Expired - Lifetime EP1460264B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0303373A FR2852636B1 (en) 2003-03-19 2003-03-19 FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE, IN PARTICULAR A MOTOR VEHICLE.
FR0303373 2003-03-19

Publications (2)

Publication Number Publication Date
EP1460264A1 EP1460264A1 (en) 2004-09-22
EP1460264B1 true EP1460264B1 (en) 2006-05-24

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Application Number Title Priority Date Filing Date
EP04290554A Expired - Lifetime EP1460264B1 (en) 2003-03-19 2004-03-01 Fuel injection system for internal combustion engine, particularly for a motor vehicle

Country Status (4)

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EP (1) EP1460264B1 (en)
AT (1) ATE327425T1 (en)
DE (1) DE602004000933T2 (en)
FR (1) FR2852636B1 (en)

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DE102005051005A1 (en) 2005-10-25 2007-04-26 Robert Bosch Gmbh Fuel injection valve for internal combustion engine has inflow-side end of valve housing in form of long connection shell deformable by radial forces
US20080169364A1 (en) * 2007-01-11 2008-07-17 Zdroik Michael J Welded fuel injector attachment
US7543567B2 (en) * 2007-10-29 2009-06-09 Caterpillar Inc. Fuel system having a one-piece hollow tube connection
EP2090772B1 (en) 2008-02-15 2012-04-25 Continental Automotive GmbH Coupling assembly
EP2093411B1 (en) 2008-02-19 2011-01-19 Continental Automotive GmbH Coupling device
EP2093414B1 (en) 2008-02-19 2011-07-20 Continental Automotive GmbH Coupling device
EP2093412B1 (en) 2008-02-19 2011-01-19 Continental Automotive GmbH Coupling device
EP2208883B1 (en) 2009-01-19 2015-07-22 Continental Automotive GmbH Coupling device
US8307809B2 (en) 2009-09-29 2012-11-13 GM Global Technology Operations LLC Engine assembly including cam cover mounted fuel rail
DE102009050337A1 (en) * 2009-10-22 2011-04-28 GM Global Technology Operations, Inc., Detroit Component unit for a fuel system of an internal combustion engine and internal combustion engine
JP5682787B2 (en) 2011-09-26 2015-03-11 株式会社デンソー Fuel injection device
EP2910768A1 (en) * 2014-02-25 2015-08-26 Continental Automotive GmbH Fuel rail assembly for an internal combustion engine and method for producing the same
DE102017216643A1 (en) * 2017-09-20 2019-03-21 Robert Bosch Gmbh Water injection device of an internal combustion engine
JP2021148047A (en) * 2020-03-18 2021-09-27 臼井国際産業株式会社 Gasoline direct injection rail

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US6564775B1 (en) * 1999-08-03 2003-05-20 Aisan Kogyo Kabushiki Kaisha Fuel delivery pipes
DE10108203A1 (en) * 2001-02-21 2002-08-29 Bosch Gmbh Robert Mounting bracket and method for mounting a fuel injector
US6565128B2 (en) * 2001-07-13 2003-05-20 Siemens Diesel Systems Technology Device and method for coupling a fluid rail with fuel injectors
US6418911B1 (en) * 2001-07-13 2002-07-16 Siemens Diesel Systems Technology Device and procedure for coupling a fluid rail with fuel injectors

Also Published As

Publication number Publication date
DE602004000933T2 (en) 2006-12-28
DE602004000933D1 (en) 2006-06-29
FR2852636B1 (en) 2005-06-17
EP1460264A1 (en) 2004-09-22
FR2852636A1 (en) 2004-09-24
ATE327425T1 (en) 2006-06-15

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