WO2018036966A1 - Fuel injector nozzle body - Google Patents

Fuel injector nozzle body Download PDF

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Publication number
WO2018036966A1
WO2018036966A1 PCT/EP2017/071033 EP2017071033W WO2018036966A1 WO 2018036966 A1 WO2018036966 A1 WO 2018036966A1 EP 2017071033 W EP2017071033 W EP 2017071033W WO 2018036966 A1 WO2018036966 A1 WO 2018036966A1
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WO
WIPO (PCT)
Prior art keywords
outlet mouth
groove
nozzle body
hole
mouth
Prior art date
Application number
PCT/EP2017/071033
Other languages
French (fr)
Inventor
Anthony Piton
Cyrille Lesieur
Original Assignee
Delphi Technologies Ip Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Ip Limited filed Critical Delphi Technologies Ip Limited
Publication of WO2018036966A1 publication Critical patent/WO2018036966A1/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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/184—Discharge orifices having non circular sections
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices

Definitions

  • This invention relates to a fuel injector whose injection holes are shaped so as to improve the homogenization of the sprayed fuel jets.
  • the pressurized fuel ejected via the injection holes of an injector forms duster jets that deploy in a compression chamber so as to leave the fuel axisymmetrically in said chamber.
  • the flow in the injection holes is a permanent source of research in order to reach an optimum compromise between speed, shape of the jet, penetration and filling of the chamber.
  • the holes are generally cylindrical with circular or oval section.
  • triangular or cat-shaped holes are also found in the literature.
  • the present invention aims to remedy the disadvantages mentioned above by proposing a simple and economical solution.
  • the invention relates to a nozzle body of a fuel injector, the body extending along a main axis from a wide end to a tip end forming an injection nozzle.
  • the body has a peripheral wall defining an inner bore adapted to receive a valve needle, the body being provided with injection holes extending through the wall of the tip end, each hole extending along a secondary axis from an inlet mouth opening in the inner bore to an outlet mouth opening in the outer face of the wall.
  • At least one of the injection holes is provided in its lateral face with at least one groove extending along the secondary axis of the hole, said groove forming a peripheral notch in the outlet mouth.
  • the length of the throat is limited to the area proximal to outlet mouth.
  • said length does not exceed 300 ⁇ and preferably is of the order of ⁇ .
  • the depth of the throat increases as it approaches the outlet mouth.
  • the depth of the groove at the outlet mouth does not exceed 20 ⁇ and is preferably of the order of ⁇ .
  • the notch has a semi-circular or rectangular or triangular section.
  • all the injection holes are provided in their lateral face with at least one groove extending along the secondary axis of the hole, said groove forming a peripheral notch in the outlet mouth.
  • the injection hole is provided with a plurality of grooves forming notches, the grooves being equidistributed to the periphery of the outlet mouth.
  • the invention further extends to a fuel injector provided with a nozzle whose body is according to any one of the preceding paragraphs.
  • Figure 1 is an axial section of a fuel injector.
  • FIGS. 2 and 3 represent two different embodiments of the outlet port of the injection holes of the injector of FIG. 1.
  • FIGS. 4 to 7 are several possibilities diagrams illustrating different outlet mouths of injection holes of the injector of FIG. 1.
  • a diesel fuel injector 10 shown in axial section XI in FIG. 1 extends along the main axis XI from an injector head shown at the top of the figure and where there is arranged an electrical connector, an inlet for the fuel and , a fuel return outlet, to an injection nozzle 12 located at the opposite low end.
  • Figure 1 is a non-limiting example of the invention that can be applied to all types of fuel injectors.
  • the injector 10 of FIG. 1 comprises in a description according to the arbitrary direction from top to bottom of FIG. 1 an actuator assembly 14, a control valve 16 and an assembled nozzle 18.
  • the assembled nozzle 18 comprises a nozzle body 20 having a peripheral wall 22 in a floor defining an interior space open at an upper end and provided at the lower end with injection holes 24 extending through the side wall between the wall. interior space and the outer face of the wall and, whereby, in use, pressurized fuel is injected into a compression chamber of an internal combustion engine.
  • a valve needle 26 is arranged axially XI guided sliding in said internal space and is movable between a closed position PF, or low position, and an open position PO, or high position.
  • the needle extends axially XI from a head to a point cooperating with a complementary face of the inside of the wall 22 of the nozzle body so as to form a valve 28 and, in the open position PO the tip of the the needle is lifted from said complementary face and the pressurized fuel is injected via the holes 24 and, in the closed position PF of the needle, the tip and the complementary surface are in sealing contact preventing any passage of fuel.
  • the injector 10 is provided with a plurality of injection holes 24 each extending along a secondary axis X2 of its own and which forms an angle of the order of 75 ° to 82.5 ° with the main axis XI, the set of secondary axes being distributed in a star and forming a cone.
  • a typical diesel injector comprises about six to twelve injection holes, each with a section diameter of the order of 80 ⁇ to 150 ⁇ , the holes extending through the wall of 0.5 to 1 mm thickness from an inlet mouth 30 located on the side of the interior space to an outlet mouth 32 opening in the outer face of said wall.
  • the outlet mouth 32 of an injection hole is shown in FIG. 2 and, from a hole of circular or oval section, said outlet mouth has indentations 34. These are created by grooves 36 dug in the lateral face of the hole 24 and extending along the secondary axis X2.
  • eighteen grooves 36 extend over a length L measured between a starting point 38 inside the hole to the outlet mouth 32, the grooves shown have a semicircular individual section and a increasing depth from the starting point 38 inside the hole where, the grooves are of zero depth and are connected to the side face of the hole, to the outlet mouth 32 where it forms a notch 34 on the periphery of said outlet mouth 32.
  • the grooves 36 form indentations 34 with a depth of 5 ⁇ at 15 ⁇ . These indentations 34 have been shown in numerical modeling that no disturbing pressure waves of the fuel jet are formed in an exit section which would be circular.
  • the length L of the grooves can be very short, of the order of magnitude of the depth of the notch, or on the contrary much longer, or even the complete length of the hole, the grooves then being of almost constant depth and opening at both ends of the hole.
  • the grooves of FIG. 2 can be made of different lengths in alternating for example a long groove with a short groove, or concentrating on long grooves on one half of the opposite hole to the other half where are only short grooves.
  • the grooves 36 are not evenly distributed around the outlet mouth but concentrated on only one half of the said periphery, the other half having no grooves.
  • an injection hole may have only one groove, which may be short or long, or several grooves distributed over a restricted angular sector around the outlet mouth.
  • Figures 4 to 7 illustrate four outlet mouths, among an infinity of possibility, these four profiles varying the number of indentations, from four to eight, the shape of notches, triangular, rectangular or semicircular.

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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)

Abstract

A fuel injector nozzle body provided with injection holes (24), at least one of the injection holes (24) being provided, in the lateral face thereof, with a groove (36) extending along a secondary axis (X2) of the hole, said groove (36) forming a peripheral indentation (34) in the outlet mouth (32).

Description

CORPS DE BUSE D'INJECTEUR DE CARBURANT DOMAINE TECHNIQUE  FUEL INJECTOR NOZZLE BODY TECHNICAL FIELD
Cette invention est relative à un injecteur de carburant dont les trous d'injection sont conformés de sorte à améliorer l'homogénéisation des jets du carburant pulvérisés. ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTION  This invention relates to a fuel injector whose injection holes are shaped so as to improve the homogenization of the sprayed fuel jets. BACKGROUND OF THE INVENTION
Dans un moteur à combustion interne, le carburant sous pression éjecté via les trous d'injection d'un injecteur forme des jets en plumeau qui se déploie dans une chambre de compression de manière à repartir axisymétriquement le carburant dans ladite chambre. L'écoulement dans les trous d'injection est une source permanente de recherche dans le but d'atteindre un compromis optimum entre vitesse, forme du jet, pénétration et remplissage de la chambre.  In an internal combustion engine, the pressurized fuel ejected via the injection holes of an injector forms duster jets that deploy in a compression chamber so as to leave the fuel axisymmetrically in said chamber. The flow in the injection holes is a permanent source of research in order to reach an optimum compromise between speed, shape of the jet, penetration and filling of the chamber.
Les trous sont globalement cylindrique de section circulaire ou ovale. Existent également des trous de sections évoluant lentement de sorte à avoir une section longitudinale en léger diabolo, voire des trous dont la face latérale est pourvue d'obstacles séparés ou encore de trous réalisés en plusieurs portions chacune séparée de la suivante par une micro marche annulaire destinée à perturber le flux du carburant injecté en créant des turbulences permettant de nettoyer la surface des trous. Grossi plus de 1000 fois on trouve également dans la littérature des trous de section triangulaire ou en forme de tête de chat.  The holes are generally cylindrical with circular or oval section. There are also sections of holes evolving slowly so as to have a longitudinal section in light diabolo, or holes whose side face is provided with separate obstacles or holes made in several portions each separated from the next by a micro annular step intended to disturb the flow of fuel injected by creating turbulence to clean the surface of the holes. Enlarged more than 1000 times, triangular or cat-shaped holes are also found in the literature.
La pression croissante, l'augmentation du nombre des trous et la diminution de leur taille, contribuent à former des jets pulvérisés de plus en plus fins et pénétrants mais dont l'axisymétrie est perturbée par la géométrie interne de la buse d'injection. RESUME DE L'INVENTION The increasing pressure, the increase in the number of holes and the decrease in their size, contribute to forming sprayed jets of finer and more penetrating but whose axisymmetry is disturbed by the internal geometry of the injection nozzle. SUMMARY OF THE INVENTION
La présente invention vise à remédier aux inconvénients mentionnés précédemment en proposant une solution simple et économique. Notamment l'invention concerne un corps de buse d'un injecteur de carburant, le corps s'étendant selon un axe principal depuis une extrémité large jusqu'à une extrémité en pointe formant buse d'injection. Le corps a une paroi périphérique définissant un alésage intérieure adapté à recevoir une aiguille de vanne, le corps étant pourvu de trous d'injections s'étendant au travers de la paroi de l'extrémité en pointe, chaque trou s'étendant selon un axe secondaire depuis une bouche d'entrée ouvrant dans l'alésage intérieure jusqu'à une bouche de sortie ouvrant dans la face extérieure de la paroi. The present invention aims to remedy the disadvantages mentioned above by proposing a simple and economical solution. In particular, the invention relates to a nozzle body of a fuel injector, the body extending along a main axis from a wide end to a tip end forming an injection nozzle. The body has a peripheral wall defining an inner bore adapted to receive a valve needle, the body being provided with injection holes extending through the wall of the tip end, each hole extending along a secondary axis from an inlet mouth opening in the inner bore to an outlet mouth opening in the outer face of the wall.
De plus, avantageusement, au moins un des trous d'injection est pourvu dans sa face latérale d'au moins une gorge s'étendant selon l'axe secondaire du trou ladite gorge formant une échancrure périphérique dans la bouche de sortie.  In addition, advantageously, at least one of the injection holes is provided in its lateral face with at least one groove extending along the secondary axis of the hole, said groove forming a peripheral notch in the outlet mouth.
De plus, la longueur de la gorge est limitée à la zone proximale à de bouche de sortie.  In addition, the length of the throat is limited to the area proximal to outlet mouth.
De plus, ladite longueur n'excède pas 300μιη et de préférence est de l'ordre de ΙΟΟμιη.  In addition, said length does not exceed 300μιη and preferably is of the order of ΙΟΟμιη.
De plus, la profondeur de la gorge augmente en s'approchant de la bouche de sortie.  In addition, the depth of the throat increases as it approaches the outlet mouth.
De plus, la profondeur de la gorge au niveau de la bouche de sortie n'excède pas 20μιη et est de préférence de l'ordre de ΙΟμιη.  In addition, the depth of the groove at the outlet mouth does not exceed 20μιη and is preferably of the order of ΙΟμιη.
De plus, dans la bouche de sortie, l'échancrure a une section semi- circulaire ou rectangulaire ou triangulaire.  In addition, in the outlet mouth, the notch has a semi-circular or rectangular or triangular section.
De plus, tous les trous d'injection sont pourvus dans leur face latérale d'au moins une gorge s'étendant selon l'axe secondaire du trou, ladite gorge formant une échancrure périphérique dans la bouche de sortie.  In addition, all the injection holes are provided in their lateral face with at least one groove extending along the secondary axis of the hole, said groove forming a peripheral notch in the outlet mouth.
De plus, un secteur angulaire limité de la bouche de sortie est pourvu d'échancrures.  In addition, a limited angular sector of the outlet mouth is provided with indentations.
De plus, le trou d'injection est pourvu d'une pluralité de gorges formant échancrures, les gorges étant equiréparties au pourtour de la bouche de sortie.  In addition, the injection hole is provided with a plurality of grooves forming notches, the grooves being equidistributed to the periphery of the outlet mouth.
L'invention s'étend de plus à un injecteur de carburant pourvu d'une buse dont le corps est selon l'un quelconque des paragraphes précédentes.  The invention further extends to a fuel injector provided with a nozzle whose body is according to any one of the preceding paragraphs.
BREVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
D'autres caractéristiques, buts et avantages de l'invention apparaîtront la lecture de la description détaillée qui suit, et en regard des dessins annexés donnés à titre d'exemple non limitatif et sur lesquels:  Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the accompanying drawings given by way of non-limiting example and in which:
La figure 1 est une section axiale d'un injecteur de carburant. Les figures 2 et 3 représentent deux différents modes de réalisation de bouche de sortie des trous d'injection de l'injecteur de la figure 1. Figure 1 is an axial section of a fuel injector. FIGS. 2 and 3 represent two different embodiments of the outlet port of the injection holes of the injector of FIG. 1.
Les figures 4 à 7 sont plusieurs schémas de possibilités illustrant différentes bouches de sortie des trous d'injection de l'injecteur de la figure 1.  FIGS. 4 to 7 are several possibilities diagrams illustrating different outlet mouths of injection holes of the injector of FIG. 1.
DESCRIPTION DES MODES DE REALISATION PREFERES DESCRIPTION OF THE PREFERRED EMBODIMENTS
Un injecteur 10 de carburant diesel représenté en section axiale XI en figure 1 s'étend selon l'axe principal XI depuis une tête d'injecteur représentée en haut de la figure et où se trouve agencés un connecteur électrique, une entrée pour le carburant et, une sortie de retour du carburant, jusqu'à une buse d'injection 12 située à l'extrémité basse opposée.  A diesel fuel injector 10 shown in axial section XI in FIG. 1 extends along the main axis XI from an injector head shown at the top of the figure and where there is arranged an electrical connector, an inlet for the fuel and , a fuel return outlet, to an injection nozzle 12 located at the opposite low end.
De très nombreux injecteurs existent et, le mode de réalisation particuliers de la figure 1 n'est qu'un exemple non limitatif de l'invention qui peut être appliquée à tous types injecteurs de carburant.  Many injectors exist and, the particular embodiment of Figure 1 is a non-limiting example of the invention that can be applied to all types of fuel injectors.
L'injecteur 10 de la figure 1 dont le fonctionnement général est connu, comprend dans une description selon le sens arbitraire de haut en bas de la figure 1 un ensemble actionneur 14, une vanne de contrôle 16 et une buse assemblée 18.  The injector 10 of FIG. 1, the general operation of which is known, comprises in a description according to the arbitrary direction from top to bottom of FIG. 1 an actuator assembly 14, a control valve 16 and an assembled nozzle 18.
La buse assemblée 18 comprend un corps de buse 20 ayant une paroi périphérique 22 en étage définissant un espace intérieur ouvert à une extrémité haute et pourvue à l'extrémité basse de trous d'injection 24 s'étendant au travers de la paroi latérale entre l'espace intérieur et la face extérieure de la paroi et, par lesquels, en utilisation, du carburant sous pression est injecté dans une chambre de compression d'un moteur à combustion interne.  The assembled nozzle 18 comprises a nozzle body 20 having a peripheral wall 22 in a floor defining an interior space open at an upper end and provided at the lower end with injection holes 24 extending through the side wall between the wall. interior space and the outer face of the wall and, whereby, in use, pressurized fuel is injected into a compression chamber of an internal combustion engine.
Une aiguille de vanne 26 est agencée axialement XI guidée coulissante dans ledit espace interne et est mobile entre une position fermée PF, ou position basse, et une position ouverte PO, ou position haute. L'aiguille s'étend axialement XI depuis une tête jusqu'à une pointe coopérant avec une face complémentaire de l'intérieur de la paroi 22 du corps de buse de sorte à former une vanne 28 et, en position ouverte PO la pointe de l'aiguille est levée de ladite face complémentaire et le carburant sous pression est injecté via les trous 24 et, en position fermée PF de l'aiguille la pointe et la surface complémentaire sont en contact étanche empêchant tout passage de carburant. L'injecteur 10 est pourvu de plusieurs trous d'injection 24 chacun s 'étendant selon un axe secondaire X2 qui lui est propre et qui forme un angle de l'ordre de 75° à 82,5° avec l'axe principal XI, l'ensemble des axes secondaires étant répartis en étoile et s'inscrivant dans un cône. Un injecteur diesel typique comprend environ de six à douze trous d'injection, chacun d'un diamètre de section de l'ordre de 80 μιη à 150 μιη, les trous s'étendant au travers de la paroi de 0,5 à 1 mm d'épaisseur depuis une bouche d'entrée 30 située du côté de l'espace intérieur jusqu'à une bouche de sortie 32 s'ouvrant dans la face extérieure de ladite paroi. A valve needle 26 is arranged axially XI guided sliding in said internal space and is movable between a closed position PF, or low position, and an open position PO, or high position. The needle extends axially XI from a head to a point cooperating with a complementary face of the inside of the wall 22 of the nozzle body so as to form a valve 28 and, in the open position PO the tip of the the needle is lifted from said complementary face and the pressurized fuel is injected via the holes 24 and, in the closed position PF of the needle, the tip and the complementary surface are in sealing contact preventing any passage of fuel. The injector 10 is provided with a plurality of injection holes 24 each extending along a secondary axis X2 of its own and which forms an angle of the order of 75 ° to 82.5 ° with the main axis XI, the set of secondary axes being distributed in a star and forming a cone. A typical diesel injector comprises about six to twelve injection holes, each with a section diameter of the order of 80 μιη to 150 μιη, the holes extending through the wall of 0.5 to 1 mm thickness from an inlet mouth 30 located on the side of the interior space to an outlet mouth 32 opening in the outer face of said wall.
La bouche de sortie 32 d'un trou d'injection est représentée en figure 2 et, à partir d'un trou de section circulaire ou ovale ladite bouche de sortie présente des échancrures 34. Celles-ci sont créées par des gorges 36 creusées dans la face latérale du trou 24 et s'étendant selon l'axe secondaire X2. Dans le mode de réalisation présenté les dix- huit gorges 36 s'étendent sur une longueur L mesurée entre un point de départ 38 intérieur au trou jusqu'à la bouche de sortie 32, les gorges représentées ont une section individuelle semi- circulaire et une profondeur croissante depuis le point de départ 38 à l'intérieure du trous où, les gorges sont de profondeur nulle et se raccordent à la face latérale du trou, jusqu'à la bouche de sortie 32 où elle forme une échancrure 34 à la périphérie de ladite bouche de sortie 32.  The outlet mouth 32 of an injection hole is shown in FIG. 2 and, from a hole of circular or oval section, said outlet mouth has indentations 34. These are created by grooves 36 dug in the lateral face of the hole 24 and extending along the secondary axis X2. In the embodiment shown eighteen grooves 36 extend over a length L measured between a starting point 38 inside the hole to the outlet mouth 32, the grooves shown have a semicircular individual section and a increasing depth from the starting point 38 inside the hole where, the grooves are of zero depth and are connected to the side face of the hole, to the outlet mouth 32 where it forms a notch 34 on the periphery of said outlet mouth 32.
Dans une configuration classique de trous 24 d'environ 115 μιη de diamètre, les gorges 36 forment des échancrures 34 de profondeur de 5μιη à 15μιη. Ces échancrures 34 ont montrés lors de modélisation numériques que ne se formaient pas, selon une section de sortie qui serait circulaire, des ondes de pression perturbatrices du jet de carburant.  In a conventional configuration of holes 24 of approximately 115 μιη in diameter, the grooves 36 form indentations 34 with a depth of 5μιη at 15μιη. These indentations 34 have been shown in numerical modeling that no disturbing pressure waves of the fuel jet are formed in an exit section which would be circular.
Par rapport au mode de réalisation présenté figure 2, de nombreuses alternatives peuvent être dérivées. Ainsi, la longueur L des gorges peut être très courte, de l'ordre de grandeur de la profondeur de Γ échancrure, ou bien au contraire beaucoup plus longue, voire de la longueur complète du trou, les gorges étant alors de profondeur quasiment constante et débouchant aux deux extrémités du trou.  Compared to the embodiment shown in Figure 2, many alternatives can be derived. Thus, the length L of the grooves can be very short, of the order of magnitude of the depth of the notch, or on the contrary much longer, or even the complete length of the hole, the grooves then being of almost constant depth and opening at both ends of the hole.
De plus, si toutes les gorges de la figure 2 ont la même longueur, dans des alternatives, les gorges peuvent être réalisées de longueurs différentes en alternant par exemple une gorge longue avec une gorge courte, ou bien en concentrant sur des gorges longues sur une moitié du trou opposée à l'autre moitié où ne sont que des gorges courtes. Moreover, if all the grooves of FIG. 2 have the same length, in alternatives, the grooves can be made of different lengths in alternating for example a long groove with a short groove, or concentrating on long grooves on one half of the opposite hole to the other half where are only short grooves.
Dans une alternative présentée en figure 3 les gorges 36 ne sont pas equiréparties au pourtour de la bouche de sortie mais concentrées sur une moitié seulement dudit pourtour, l'autre moitié n'ayant pas de gorges. Dans des variantes non représentées, un trou d'injection peut n'avoir qu'une seule gorge, celle-ci pouvant être courte ou longue, ou plusieurs gorges réparties sur un secteur angulaire restreint du pourtour de la bouche de sortie.  In an alternative shown in FIG. 3, the grooves 36 are not evenly distributed around the outlet mouth but concentrated on only one half of the said periphery, the other half having no grooves. In variants not shown, an injection hole may have only one groove, which may be short or long, or several grooves distributed over a restricted angular sector around the outlet mouth.
Les figures 4 à 7 illustrent quatre bouches de sorties, parmi une infinité de possibilité, ces quatre profils variant le nombre d'échancrure, de quatre à huit, la forme des échancrures, triangulaires, rectangulaire ou encore semi-circulaire.  Figures 4 to 7 illustrate four outlet mouths, among an infinity of possibility, these four profiles varying the number of indentations, from four to eight, the shape of notches, triangular, rectangular or semicircular.
LISTE DES REFERENCES UTILISEESLIST OF REFERENCES USED
XI axe principal XI main axis
X2 axe secondaire  X2 secondary axis
PO position ouverte  PO open position
PF position fermée  PF closed position
L longueur  L length
10 injecteur 10 injector
12 buse d'injection  12 injection nozzle
14 ensemble actionneur  14 actuator assembly
16 vanne de contrôle  16 control valve
18 buse assemblée  18 nozzle assembly
20 corps de buse  20 nozzle body
22 paroi périphérique  22 peripheral wall
24 trous d'injection  24 injection holes
26 aiguille  26 needle
28 vanne  28 valve
30 bouche d'entrée  30 mouth of entry
32 bouche de sortie  32 outlet mouth
34 échancrure 36 gorge 34 indentation 36 throat
38 point de départ des gorges  38 starting point of the gorge

Claims

REVENDICATIONS
1. Corps de buse (20) d'un injecteur (10) de carburant, le corps (20) s'étendant selon un axe principal (XI) depuis une extrémité large jusqu'à une extrémité en pointe formant buse d'injection (12), le corps (20) ayant une paroi périphérique (22) définissant un alésage intérieure adapté à recevoir une aiguille de vanne (26), le corps (20) étant pourvu de trous d'injections (24) s'étendant au travers de la paroi (22) de l'extrémité en pointe, chaque trou (24) s'étendant selon un axe secondaire (X2) depuis une bouche d'entrée (30) ouvrant dans l'alésage intérieur jusqu'à une bouche de sortie (32) ouvrant dans la face extérieure de la paroi, A nozzle body (20) of a fuel injector (10), the body (20) extending along a main axis (XI) from a broad end to a tip end forming an injection nozzle ( 12), the body (20) having a peripheral wall (22) defining an inner bore adapted to receive a valve needle (26), the body (20) being provided with injection holes (24) extending therethrough from the wall (22) of the pointed end, each hole (24) extending along a secondary axis (X2) from an inlet mouth (30) opening in the internal bore to an outlet mouth (32) opening in the outer face of the wall,
un des trous d'injection (24) au moins étant pourvu dans sa face latérale d'au moins une gorge (36) s'étendant selon l'axe secondaire (X2) du trou ladite gorge (36) formant une échancrure (34) périphérique dans la bouche de sortie (32), caractérisé en ce que  at least one of the injection holes (24) being provided in its lateral face with at least one groove (36) extending along the secondary axis (X2) of the hole, said groove (36) forming an indentation (34) device in the outlet mouth (32), characterized in that
la longueur (L) de la gorge est limitée à la zone proximale à de bouche de sortie (32), ladite longueur (L) n'excédant pas 300μιη et étant de préférence de l'ordre de ΙΟΟμιη.  the length (L) of the groove is limited to the proximal zone to mouth outlet (32), said length (L) not exceeding 300μιη and preferably being of the order of ΙΟΟμιη.
2. Corps de buse (20) selon la revendication précédente dans lequel la profondeur de la gorge augmente en s'approchant de la bouche de sortie (32). 2. nozzle body (20) according to the preceding claim wherein the depth of the groove increases as it approaches the outlet mouth (32).
3. Corps de buse (20) selon la revendication 2 dans lequel la profondeur de la gorge au niveau de la bouche de sortie (32) n'excède pas 20μιη et est de préférence de l'ordre de ΙΟμιη. 3. nozzle body (20) according to claim 2 wherein the depth of the groove at the outlet mouth (32) does not exceed 20μιη and is preferably of the order of ΙΟμιη.
4. Corps de buse (20) selon l'une quelconque des revendications précédentes dans lequel, dans la bouche de sortie (32), l'échancrure a une section semi-circulaire ou rectangulaire ou triangulaire. 4. nozzle body (20) according to any one of the preceding claims wherein in the outlet mouth (32), the notch has a semi-circular or rectangular or triangular section.
5. Corps de buse (20) selon l'une quelconque des revendications précédentes dans lequel tous les trous d'injection (24) sont pourvus dans leur face latérale d'au moins une gorge (36) s'étendant selon l'axe secondaire (X2) du trou, ladite gorge (36) formant une échancrure (34) périphérique dans la bouche de sortie (32). A nozzle body (20) according to any one of the preceding claims wherein all the injection holes (24) are provided in their lateral face with at least one groove (36) extending along the secondary axis. (X2) of the hole, said groove (36) forming a peripheral indentation (34) in the outlet mouth (32).
6. Corps de buse (20) selon une quelconque des revendications précédentes dans lequel un secteur angulaire limité de la bouche de sortie (32) est pourvu d' échancrures (34). A nozzle body (20) according to any one of the preceding claims wherein a limited angular sector of the outlet mouth (32) is provided with indentations (34).
7. Corps de buse (20) selon une quelconque des revendications 1 à 5 dans lequel le trou d'injection (24) est pourvu d'une pluralité de gorges (36) formant échancrures (34), les gorges (36) étant equiréparties au pourtour de la bouche de sortie (32). The nozzle body (20) according to any one of claims 1 to 5 wherein the injection hole (24) is provided with a plurality of grooves (36) forming notches (34), the grooves (36) being equal parts around the outlet mouth (32).
Injecteur de carburant (10) pourvu d'une buse dont le corps (20) est selon quelconque des revendications précédentes. Fuel injector (10) provided with a nozzle whose body (20) is according to any one of the preceding claims.
PCT/EP2017/071033 2016-08-24 2017-08-21 Fuel injector nozzle body WO2018036966A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1657891 2016-08-24
FR1657891A FR3055371A1 (en) 2016-08-24 2016-08-24 FUEL INJECTOR NOZZLE BODY

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WO2018036966A1 true WO2018036966A1 (en) 2018-03-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023110127A1 (en) * 2021-12-17 2023-06-22 Volvo Truck Corporation A nozzle cap, a fuel gas injection and a hydrogen internal combustion engine
US12037967B2 (en) 2020-08-19 2024-07-16 Cummins Inc. Fuel injector having nozzle spray holes with grooves

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DE3415905A1 (en) * 1984-04-28 1985-11-07 Daimler-Benz Ag, 7000 Stuttgart Hole type nozzle for internal combustion engine with direct injection
JPH09126096A (en) * 1995-11-06 1997-05-13 Hino Motors Ltd Fuel injection device
WO1997033086A1 (en) * 1996-03-04 1997-09-12 Jerzy Chomiak Orifice shape of a fuel injector
WO2006018436A1 (en) * 2004-08-20 2006-02-23 Robert Bosch Gmbh Sooting-controlled nozzle
DE102004044820A1 (en) * 2004-09-16 2006-03-30 Robert Bosch Gmbh Fuel injection valve for direct injection of fuel into combustion chamber of internal combustion engine, has nozzle body with castellated structure around its periphery
FR2878583A1 (en) * 2004-11-29 2006-06-02 Renault Sas Fuel injector nozzle for e.g. direct injection diesel engine of motor vehicle, has injection conduit with inner cylindrical wall against which liquid fuel boundary layer reseals, after passage of bump formed by convex portions
EP2818687A1 (en) * 2013-06-27 2014-12-31 Delphi International Operations Luxembourg S.à r.l. Fuel injector
DE102014226762A1 (en) * 2014-12-22 2016-06-23 Continental Automotive Gmbh Nozzle body and fluid injection valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415905A1 (en) * 1984-04-28 1985-11-07 Daimler-Benz Ag, 7000 Stuttgart Hole type nozzle for internal combustion engine with direct injection
JPH09126096A (en) * 1995-11-06 1997-05-13 Hino Motors Ltd Fuel injection device
WO1997033086A1 (en) * 1996-03-04 1997-09-12 Jerzy Chomiak Orifice shape of a fuel injector
WO2006018436A1 (en) * 2004-08-20 2006-02-23 Robert Bosch Gmbh Sooting-controlled nozzle
DE102004044820A1 (en) * 2004-09-16 2006-03-30 Robert Bosch Gmbh Fuel injection valve for direct injection of fuel into combustion chamber of internal combustion engine, has nozzle body with castellated structure around its periphery
FR2878583A1 (en) * 2004-11-29 2006-06-02 Renault Sas Fuel injector nozzle for e.g. direct injection diesel engine of motor vehicle, has injection conduit with inner cylindrical wall against which liquid fuel boundary layer reseals, after passage of bump formed by convex portions
EP2818687A1 (en) * 2013-06-27 2014-12-31 Delphi International Operations Luxembourg S.à r.l. Fuel injector
DE102014226762A1 (en) * 2014-12-22 2016-06-23 Continental Automotive Gmbh Nozzle body and fluid injection valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12037967B2 (en) 2020-08-19 2024-07-16 Cummins Inc. Fuel injector having nozzle spray holes with grooves
WO2023110127A1 (en) * 2021-12-17 2023-06-22 Volvo Truck Corporation A nozzle cap, a fuel gas injection and a hydrogen internal combustion engine

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