EP2818687A1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP2818687A1
EP2818687A1 EP13173947.6A EP13173947A EP2818687A1 EP 2818687 A1 EP2818687 A1 EP 2818687A1 EP 13173947 A EP13173947 A EP 13173947A EP 2818687 A1 EP2818687 A1 EP 2818687A1
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EP
European Patent Office
Prior art keywords
injector
groove
needle
flange
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13173947.6A
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German (de)
French (fr)
Inventor
Guillaume Brignon
Marion Balin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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.)
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Publication date
Application filed by Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13173947.6A priority Critical patent/EP2818687A1/en
Priority to PCT/EP2014/062239 priority patent/WO2014206753A1/en
Publication of EP2818687A1 publication Critical patent/EP2818687A1/en
Withdrawn legal-status Critical Current

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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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to a fuel injector and more particularly to a collar which are equipped with some and which forms an annular restriction to the passage of fuel under pressure.
  • the fuel injectors have a tubular body of which one end forms a nozzle and in the body a needle driven between an "open nozzle” position and a "closed nozzle” position.
  • the needle of some injectors is provided with a flange extending radially to the vicinity of the body to form an annular restriction through which the pressurized fuel must pass which generates a pressure drop helping to control the needle.
  • the profile of the restriction, the axial length, and the diameter of the flange are critical. The nominal dimensions must be carefully chosen and the manufacturing tolerances are very tight, especially to take into account the temperature sensitivity for which a short length or sharp edge, and a minimum restriction are preferable.
  • the present invention aims to solve these problems by providing a pressurized fuel injector comprising a tubular body extending along a longitudinal axis provided with an axial bore and a needle arranged axially sliding in the bore.
  • the needle is of smaller cross section than the bore, the fuel flowing in the tubular space between the needle and the wall of the bore.
  • the needle is locally provided with a collar forming a restriction to the passage of fuel.
  • the flange extends radially from the needle to near the wall of the bore and longitudinally between an upstream face and a downstream face.
  • the flange is provided in its longitudinal peripheral wall of at least one groove so as to create at least two restrictions that the fuel must pass in series. Thus the manufacturing tolerances of the collar can be enlarged.
  • the depth of the groove is much smaller than the radial extent d of the collar.
  • the depth of the groove is at least 0.2 mm, preferably between 0.4 mm and 0.6 mm.
  • the width of the groove, measured longitudinally along the peripheral wall of the collar is less than the longitudinal length of the flange measured between the upstream face and the downstream face.
  • the width of the groove is between 0.5 mm and 1.5 mm and preferably between 0.8 mm and 1.2 mm.
  • profile of the groove may be trapezoidal or semi-circular or semi-oblong or triangular or rectangular or any other geometry.
  • the flange is provided with two grooves.
  • the groove is helical forming a thread in the peripheral wall.
  • At least one of the upstream or downstream faces may be provided with a peripheral chamfer.
  • An injector 10 of fuel C comprises a tubular body 12 extending along a longitudinal axis A.
  • the interior of the body 12 is a bore 14 having a cylindrical wall 16 of diameter d1.
  • an injection nozzle At one end of the body is formed an injection nozzle and, in the bore 14 is arranged axially sliding a needle 18 of diameter d2, driven as a function of the pressure difference between a control chamber located upstream and the nozzle located downstream, between a closed nozzle position and an open nozzle position.
  • the diameter d2 of the needle 18 is smaller than the diameter of the cylindrical wall 16. Also, does the pressurized fuel C circulate without loss of pressure in the tubular space E situated between the cylindrical wall 16 and the 18 L needle.
  • needle 18 is further provided with a flange 20 forming a restriction R at the passage of the fuel C.
  • the flange 20 extends longitudinally A over a length L between an upstream transverse face 22 and a transverse transverse face 24 of diameters d3, and which are connected by a peripheral wall 26 substantially parallel to the cylindrical wall 16 of the bore 14, the restriction R being the thin space between said peripheral walls 26 and cylindrical 16.
  • the upstream faces 22 and downstream 24 are shown symmetrical to each other and provided with peripheral chamfers 32. Alternatively, they may be fully sloping, conical or slightly rounded and they may have different diameters and chamfers.
  • the peripheral wall 26 of the flange 20 is provided with an annular groove 28 substantially equidistant from the upstream faces 22 and swallows 24.
  • the groove 28 may be eccentric and made closer to one than the other.
  • the groove 28 is defined by its profile P, its depth D measured between the peripheral wall 26 and the bottom 30 of the groove 28 and its width S measured at the peripheral wall 26.
  • the collar 20 creates a upstream restriction R1 and a restriction avale R2 identical separated from each other by the width S of the groove 28.
  • the depth D of the groove 28 is much smaller than the diameter d3 of the collar 20 and the separation width S is also much smaller than the longitudinal length L of the flange 20.
  • the depth D of the groove 28 is at least 0.2 mm.
  • the depth D is between 0.4 mm and 0.6 mm.
  • the separation width S is between 0.5 mm and 1.5 mm.
  • the width S is between 0.8 mm and 1.2 mm.
  • upstream restrictions R1 and downstream R2 shown are identical, however, according to a non-illustrated embodiment, they may be different both in individual longitudinal length, the groove 28 being for example off-center, and in individual radial distance, the upstream face 22 and the downstream face 24 having different diameters.
  • the fuel C flowing from the upstream undergoes a first pressure expansion, or loss of load, through the upstream restriction R1 and a second expansion through the downstream restriction R2.
  • the groove 28 may have different profiles P.
  • the figures illustrate several examples of non-limiting profile P of the invention.
  • the profile P can be chosen trapezoidal figure 1 , semicircular figure 2 , trapezoidal again but of larger size figure 3 , oblong figure 4 .
  • Other profiles, triangular or rectangular for example, are of course possible.
  • the flange 20 is provided with two grooves 28 thus creating three restrictions which must be successively crossed by the fuel C.
  • the two grooves 28 of the figure 5 are trapezoidal and identical. Obviously we can choose other profiles, including any of those presented before. In addition the two grooves may have P profiles different from each other and different dimensions.
  • the collar 20 may be provided with three grooves 28 or even four or more, each having its profile P and its dimensions D, S, clean.
  • the separate grooves as represented on the figure 5 may be replaced by one or two threads several threads forming one or more helical grooves each making at least one turn of the collar 20.
  • the needle 18, the flange 20 have been represented circular of revolution.
  • the invention is not limited to this geometry and can be extended to any type of transverse section.

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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

Un injecteur (10) de carburant (C) comprend un corps (12) tubulaire pourvu d'un alésage (14) et, une aiguille (18) agencée axialement (A) coulissante dans l'alésage (14), l'aiguille (18) ayant une section transversale nettement inférieur à celle de l'alésage (14). L'aiguille (18) est localement pourvue d'une collerette (20) s'étendant radialement depuis l'aiguille (18) jusqu'à proximité de la paroi (16) de l'alésage (14) et longitudinalement (A) entre une face amont (22) et une face avale (24). La collerette (20) est pourvue dans sa paroi périphérique (26) longitudinale d'au moins une gorge (28) de sorte à créer au moins deux restrictions (R1, R2) que le carburant (C) doit franchir en série.

Figure imgaf001
A fuel injector (10) comprises a tubular body (12) provided with a bore (14) and a needle (18) axially arranged (A) sliding in the bore (14), the needle ( 18) having a cross section much smaller than that of the bore (14). The needle (18) is locally provided with a flange (20) extending radially from the needle (18) to near the wall (16) of the bore (14) and longitudinally (A) between an upstream face (22) and a downstream face (24). The flange (20) is provided in its longitudinal peripheral wall (26) with at least one groove (28) so as to create at least two restrictions (R1, R2) that the fuel (C) must pass in series.
Figure imgaf001

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention est relative à un injecteur de carburant et plus particulièrement à une collerette dont sont équipés certains et qui forme une restriction annulaire au passage du carburant sous pression.The present invention relates to a fuel injector and more particularly to a collar which are equipped with some and which forms an annular restriction to the passage of fuel under pressure.

ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTIONBACKGROUND OF THE INVENTION

Les injecteurs de carburant ont un corps tubulaire dont une extrémité forme une buse et, dans le corps une aiguille pilotée entre une position « buse ouverte » et une position « buse fermée ». L'aiguille de certains injecteurs est pourvue d'une collerette s'étendant radialement jusqu'à proximité du corps pour former une restriction annulaire par laquelle le carburant pressurisé doit passer ce qui génère une chute de pression aidant au pilotage de l'aiguille. Le profil de la restriction, la longueur axiale, et le diamètre de la collerette sont critiques. Les dimensions nominales doivent être choisies avec soin et les tolérances de fabrication sont très serrées, notamment pour tenir compte de la sensibilité à la température pour laquelle une longueur courte, voire à bord aiguisé, et une restriction minimale sont préférables.The fuel injectors have a tubular body of which one end forms a nozzle and in the body a needle driven between an "open nozzle" position and a "closed nozzle" position. The needle of some injectors is provided with a flange extending radially to the vicinity of the body to form an annular restriction through which the pressurized fuel must pass which generates a pressure drop helping to control the needle. The profile of the restriction, the axial length, and the diameter of the flange are critical. The nominal dimensions must be carefully chosen and the manufacturing tolerances are very tight, especially to take into account the temperature sensitivity for which a short length or sharp edge, and a minimum restriction are preferable.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention vise à résoudre ces problèmes en proposant un injecteur de carburant pressurisé comprenant un corps tubulaire s'étendant selon un axe longitudinal pourvu d'un alésage axial et, une aiguille agencée axialement coulissante dans l'alésage. L'aiguille est de section transversale inférieure à celle de l'alésage, le carburant circulant dans l'espace tubulaire compris entre l'aiguille et la paroi de l'alésage. L'aiguille est localement pourvue d'une collerette formant restriction au passage du carburant. La collerette s'étend radialement depuis l'aiguille jusqu'à proximité de la paroi de l'alésage et longitudinalement entre une face amont et une face avale. La collerette est pourvue dans sa paroi périphérique longitudinale d'au moins une gorge de sorte à créer au moins deux restrictions que le carburant doit franchir en série. Ainsi les tolérances de fabrication de la collerette peuvent être élargies.The present invention aims to solve these problems by providing a pressurized fuel injector comprising a tubular body extending along a longitudinal axis provided with an axial bore and a needle arranged axially sliding in the bore. The needle is of smaller cross section than the bore, the fuel flowing in the tubular space between the needle and the wall of the bore. The needle is locally provided with a collar forming a restriction to the passage of fuel. The flange extends radially from the needle to near the wall of the bore and longitudinally between an upstream face and a downstream face. The flange is provided in its longitudinal peripheral wall of at least one groove so as to create at least two restrictions that the fuel must pass in series. Thus the manufacturing tolerances of the collar can be enlarged.

La profondeur de la gorge, mesurée radialement à partir de la paroi périphérique, est très inférieure à l'étendue radiale d de la collerette.The depth of the groove, measured radially from the peripheral wall, is much smaller than the radial extent d of the collar.

La profondeur de la gorge est au moins de 0,2 mm de manière préférée comprise entre 0,4 mm et 0,6 mm.The depth of the groove is at least 0.2 mm, preferably between 0.4 mm and 0.6 mm.

La largeur de la gorge, mesurée longitudinalement le long de la paroi périphérique de la collerette est inférieure à la longueur longitudinale de la collerette mesurée entre la face amont et la face avale.The width of the groove, measured longitudinally along the peripheral wall of the collar is less than the longitudinal length of the flange measured between the upstream face and the downstream face.

La largeur de la gorge est comprise entre 0,5 mm et 1,5 mm et de manière préférée comprise entre 0,8 mm et 1,2 mm.The width of the groove is between 0.5 mm and 1.5 mm and preferably between 0.8 mm and 1.2 mm.

De plus le profil de la gorge peut être trapézoïdal ou semi-circulaire ou semi-oblong ou triangulaire ou rectangulaire ou selon toute autre géométrie.In addition the profile of the groove may be trapezoidal or semi-circular or semi-oblong or triangular or rectangular or any other geometry.

Selon un autre mode de réalisation la collerette est pourvue de deux gorges.According to another embodiment the flange is provided with two grooves.

Selon encore un autre mode de réalisation la gorge est hélicoïdale formant un filetage dans la paroi périphérique.According to yet another embodiment the groove is helical forming a thread in the peripheral wall.

Par ailleurs, au moins une des faces amont ou avale peut être pourvue d'un chanfrein périphérique.In addition, at least one of the upstream or downstream faces may be provided with a peripheral chamfer.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit, et en regard des dessins annexés, donnés à titre d'exemple non limitatif et sur lesquels:

  • La figure 1 est une coupe d'un injecteur dont l'aiguille est pourvue d'une collerette ayant une gorge trapézoïdale.
  • La figure 2 est une coupe d'un injecteur dont l'aiguille est pourvue d'une collerette ayant une gorge semi-circulaire.
  • La figure 3 est une coupe d'un injecteur dont l'aiguille est pourvue d'une collerette ayant une gorge trapézoïdale plus importante que celle de la figure 1.
  • La figure 4 est une coupe d'un injecteur dont l'aiguille est pourvue d'une collerette ayant une gorge semi-oblong.
  • La figure 5 est une coupe d'un injecteur dont l'aiguille est pourvue d'une collerette ayant deux gorges.
Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given by way of non-limiting example and in which:
  • The figure 1 is a section of an injector whose needle is provided with a collar having a trapezoidal groove.
  • The figure 2 is a section of an injector whose needle is provided with a collar having a semicircular groove.
  • The figure 3 is a section of an injector whose needle is provided with a flange having a trapezoidal groove larger than that of the figure 1 .
  • The figure 4 is a section of an injector whose needle is provided with a collar having a semi-oblong groove.
  • The figure 5 is a section of an injector whose needle is provided with a collar having two grooves.

DESCRIPTION DES MODES DE REALISATION PREFERESDESCRIPTION OF THE PREFERRED EMBODIMENTS

Un injecteur 10 de carburant C, non représenté dans son ensemble, comprend un corps 12 tubulaire s'étendant selon un axe longitudinal A. L'intérieur du corps 12 est un alésage 14 ayant une paroi cylindrique 16 de diamètre d1. A une extrémité du corps est formée une buse d'injection et, dans l'alésage 14 est agencée axialement coulissante une aiguille 18 de diamètre d2, pilotée en fonction de la différence de pression entre une chambre de contrôle située en amont et la buse située en aval, entre une position buse fermée et une position buse ouverte. Le diamètre d2 de l'aiguille 18 est inférieur au diamètre d1 la paroi cylindrique 16 aussi, le carburant C pressurisé circule-t-il sans perte de pression dans l'espace tubulaire E situé entre la paroi cylindrique 16 et l'aiguille 18 L'aiguille 18 est de plus pourvue d'une collerette 20 formant une restriction R au passage du carburant C. La collerette 20 s'étend longitudinalement A sur une longueur L entre une face transversale amont 22 et une face transversale avale 24 de diamètres d3, et qui sont reliées par une paroi périphérique 26 sensiblement parallèle à la paroi cylindrique 16 de l'alésage 14, la restriction R étant le mince espace compris entre lesdites parois périphérique 26 et cylindrique 16.An injector 10 of fuel C, not shown as a whole, comprises a tubular body 12 extending along a longitudinal axis A. The interior of the body 12 is a bore 14 having a cylindrical wall 16 of diameter d1. At one end of the body is formed an injection nozzle and, in the bore 14 is arranged axially sliding a needle 18 of diameter d2, driven as a function of the pressure difference between a control chamber located upstream and the nozzle located downstream, between a closed nozzle position and an open nozzle position. The diameter d2 of the needle 18 is smaller than the diameter of the cylindrical wall 16. Also, does the pressurized fuel C circulate without loss of pressure in the tubular space E situated between the cylindrical wall 16 and the 18 L needle. needle 18 is further provided with a flange 20 forming a restriction R at the passage of the fuel C. The flange 20 extends longitudinally A over a length L between an upstream transverse face 22 and a transverse transverse face 24 of diameters d3, and which are connected by a peripheral wall 26 substantially parallel to the cylindrical wall 16 of the bore 14, the restriction R being the thin space between said peripheral walls 26 and cylindrical 16.

Les faces amont 22 et avale 24 sont représentées symétriques l'une de l'autre et pourvues de chanfreins 32 périphériques. Alternativement, elles peuvent être entièrement pentues, coniques ou légèrement arrondies et elles peuvent avoir des diamètres et des chanfreins différents.The upstream faces 22 and downstream 24 are shown symmetrical to each other and provided with peripheral chamfers 32. Alternatively, they may be fully sloping, conical or slightly rounded and they may have different diameters and chamfers.

Dans un premier mode de réalisation, illustré par les figures 1 à 4, la paroi périphérique 26 de la collerette 20 est pourvue d'une gorge annulaire 28 sensiblement équidistante des faces amont 22 et avale 24. Dans une alternative la gorge 28 peut être excentrée et réalisée plus proche d'une que de l'autre. La gorge 28 est définit par son profil P, sa profondeur D mesurée entre la paroi périphérique 26 et le fond 30 de la gorge 28 et, sa largeur S mesurée au niveau de la paroi périphérique 26. Tel que représenté, la collerette 20 créée une restriction amont R1 et une restriction avale R2 identiques séparées l'une de l'autre par la largeur S de la gorge 28. Tel qu'observable sur les figures, la profondeur D de la gorge 28 est très inférieure au diamètre d3 de la collerette 20 et, la largeur de séparation S est également très inférieure à la longueur longitudinale L de la collerette 20.In a first embodiment, illustrated by the Figures 1 to 4 , the peripheral wall 26 of the flange 20 is provided with an annular groove 28 substantially equidistant from the upstream faces 22 and swallows 24. In an alternative, the groove 28 may be eccentric and made closer to one than the other. The groove 28 is defined by its profile P, its depth D measured between the peripheral wall 26 and the bottom 30 of the groove 28 and its width S measured at the peripheral wall 26. As shown, the collar 20 creates a upstream restriction R1 and a restriction avale R2 identical separated from each other by the width S of the groove 28. As seen in the figures, the depth D of the groove 28 is much smaller than the diameter d3 of the collar 20 and the separation width S is also much smaller than the longitudinal length L of the flange 20.

Selon un mode de réalisation, la profondeur D de la gorge 28 est au moins de 0,2 mm. De manière préférée, la profondeur D est comprise entre 0,4 mm et 0,6 mm. Par ailleurs, la largeur de séparation S est comprise entre 0,5 mm et 1,5 mm. De manière préférée, la largeur S est comprise entre 0,8 mm et 1,2 mm. Un optimum peut être atteint avec une gorge 28 ayant une profondeur D d'environ 0,5 mm et une largeur S d'environ 1,0 mm.According to one embodiment, the depth D of the groove 28 is at least 0.2 mm. Preferably, the depth D is between 0.4 mm and 0.6 mm. Moreover, the separation width S is between 0.5 mm and 1.5 mm. Preferably, the width S is between 0.8 mm and 1.2 mm. An optimum can be achieved with a groove 28 having a depth D of about 0.5 mm and a width S of about 1.0 mm.

Les restrictions amont R1 et avale R2 représentées sont identiques cependant, selon un mode de réalisation non illustré, elles peuvent être différentes tant en longueur longitudinale individuelle, la gorge 28 étant par exemple décentrée, qu'en distance radiale individuelle, la face amont 22 et la face avale 24 ayant des diamètres différents.The upstream restrictions R1 and downstream R2 shown are identical, however, according to a non-illustrated embodiment, they may be different both in individual longitudinal length, the groove 28 being for example off-center, and in individual radial distance, the upstream face 22 and the downstream face 24 having different diameters.

Le carburant C circulant depuis l'amont, représenté symboliquement en haut des figures, subit une première détente de pression, ou perte de charge, en passant par la restriction amont R1 puis une seconde détente en passant par la restriction avale R2.The fuel C flowing from the upstream, represented symbolically at the top of the figures, undergoes a first pressure expansion, or loss of load, through the upstream restriction R1 and a second expansion through the downstream restriction R2.

La gorge 28 peut avoir différents profils P. Les figures illustrent plusieurs exemples de profil P non limitatifs de l'invention. Le profil P peut être choisi trapézoïdal figure 1, semi-circulaire figure 2, trapézoïdal à nouveau mais de plus grande dimension figure 3, oblong en figure 4. D'autres profils, triangulaire ou rectangulaire par exemple, sont bien sûr possibles.The groove 28 may have different profiles P. The figures illustrate several examples of non-limiting profile P of the invention. The profile P can be chosen trapezoidal figure 1 , semicircular figure 2 , trapezoidal again but of larger size figure 3 , oblong figure 4 . Other profiles, triangular or rectangular for example, are of course possible.

Selon un second mode de réalisation représenté figure 5, la collerette 20 est pourvue de deux gorges 28 créant ainsi trois restrictions qui doivent être successivement franchies par le carburant C. Les deux gorges 28 de la figure 5 sont trapézoïdales et identiques. On pourra évidemment choisir des profils autres, notamment l'un quelconque de ceux présentés par avant. De plus les deux gorges peuvent avoir des profils P différents l'une de l'autre et des dimensions différentes.According to a second embodiment shown figure 5 , the flange 20 is provided with two grooves 28 thus creating three restrictions which must be successively crossed by the fuel C. The two grooves 28 of the figure 5 are trapezoidal and identical. Obviously we can choose other profiles, including any of those presented before. In addition the two grooves may have P profiles different from each other and different dimensions.

Selon une alternative au second mode de réalisation, la collerette 20 peut être pourvue de trois gorges 28 voire quatre ou plus encore, chacune ayant son profil P et ses dimensions D, S, propres.According to an alternative to the second embodiment, the collar 20 may be provided with three grooves 28 or even four or more, each having its profile P and its dimensions D, S, clean.

Selon un troisième mode de réalisation, les gorges séparées telles que représentées sur la figure 5 peuvent être remplacées par un filetage à un ou plusieurs filets formant une ou plusieurs gorges hélicoïdales faisant chacune au moins un tour de la collerette 20.According to a third embodiment, the separate grooves as represented on the figure 5 may be replaced by one or two threads several threads forming one or more helical grooves each making at least one turn of the collar 20.

Dans la description qui précède l'alésage 16, l'aiguille 18, la collerette 20 ont été représentées circulaire de révolution. Cependant l'invention n'est pas limitée à cette géométrie et peut être étendue à tout type de section transverse.In the description which precedes the bore 16, the needle 18, the flange 20 have been represented circular of revolution. However, the invention is not limited to this geometry and can be extended to any type of transverse section.

Claims (13)

Injecteur (10) de carburant (C) pressurisé comprenant un corps (12) tubulaire s'étendant selon un axe longitudinal (A) et pourvu d'un alésage (14) axial (A) et, une aiguille (18) agencée axialement (A) coulissante dans l'alésage (14), l'aiguille (18) étant de section transversale nettement inférieur à celle de l'alésage (14), le carburant (C) circulant dans l'espace (E) tubulaire compris entre l'aiguille (18) et la paroi (16) de l'alésage, l'aiguille (18) étant localement pourvue d'une collerette (20) formant restriction au passage du carburant (C), la collerette (20) s'étendant radialement depuis l'aiguille (18) jusqu'à proximité de la paroi (16) de l'alésage (14) et longitudinalement (A) entre une face amont (22) et une face avale (24), caractérisé en ce que la collerette (20) est pourvue dans sa paroi périphérique (26) longitudinale d'au moins une gorge (28) de sorte à créer au moins deux restrictions (R1, R2) que le carburant (C) doit franchir en série.A pressurized fuel injector (10) comprising a tubular body (12) extending along a longitudinal axis (A) and provided with an axial bore (14) (A) and an axially arranged needle (18) ( A) sliding in the bore (14), the needle (18) being of much smaller cross section than the bore (14), the fuel (C) flowing in the space (E) between tubular needle (18) and the wall (16) of the bore, the needle (18) being locally provided with a flange (20) forming a restriction to the passage of the fuel (C), the flange (20) extending radially from the needle (18) to the wall (16) of the bore (14) and longitudinally (A) between an upstream face (22) and a downstream face (24), characterized in that the flange (20) is provided in its longitudinal peripheral wall (26) with at least one groove (28) so as to create at least two restrictions (R1, R2) that the fuel (C) must pass in series. Injecteur (10) selon la revendication précédente dans lequel la profondeur (D) de la gorge (28), mesurée radialement à partir de la paroi périphérique (26), est très inférieure à l'étendue radiale (d3) de la collerette (20).Injector (10) according to the preceding claim wherein the depth (D) of the groove (28), measured radially from the peripheral wall (26), is much smaller than the radial extent (d3) of the collar (20). ). Injecteur (10) selon la revendication 2 dans lequel la profondeur (D) est au moins de 0,2 mm.Injector (10) according to claim 2 wherein the depth (D) is at least 0.2 mm. Injecteur (10) selon la revendication 3 dans lequel la profondeur (D) est comprise entre 0,4 mm et 0,6 mm.Injector (10) according to claim 3 wherein the depth (D) is between 0.4 mm and 0.6 mm. Injecteur (10) selon l'une quelconque des revendications précédentes dans lequel la largeur (S) de la gorge (28), mesurée longitudinalement (A) le long de la paroi périphérique (26) de la collerette (20), est inférieure à la longueur (L) longitudinale de la collerette (20) mesurée entre la face amont (22) et la face avale (24).Injector (10) according to any one of the preceding claims wherein the width (S) of the groove (28), measured longitudinally (A) along the peripheral wall (26) of the flange (20), is less than the longitudinal length (L) of the flange (20) measured between the upstream face (22) and the downstream face (24). Injecteur (10) selon la revendication 5 dans lequel la largeur (S) de la gorge (28) est comprise entre 0,5 mm et 1,5 mm.Injector (10) according to claim 5 wherein the width (S) of the groove (28) is between 0.5 mm and 1.5 mm. Injecteur (10) selon la revendication 6 dans lequel la largeur (S) de la gorge (28) est comprise entre 0,8 mm et 1,2 mm.Injector (10) according to claim 6 wherein the width (S) of the groove (28) is between 0.8 mm and 1.2 mm. Injecteur (10) selon l'une quelconque des revendications précédentes dans lequel le profil (P) de la gorge (28) est trapézoïdal.Injector (10) according to any preceding claim wherein the profile (P) of the groove (28) is trapezoidal. Injecteur (10) selon l'une quelconque des revendications 1 à 7 dans lequel le profil (P) de la gorge (28) est semi-circulaire.Injector (10) according to any one of claims 1 to 7 wherein the profile (P) of the groove (28) is semicircular. Injecteur (10) selon l'une quelconque des revendications 1 à 7 dans lequel le profil (P) de la gorge (28) est semi-oblong.Injector (10) according to any one of claims 1 to 7 wherein the profile (P) of the groove (28) is semi-oblong. Injecteur (10) selon l'une quelconque des revendications précédentes dans lequel la collerette (20) est pourvue de deux gorges (28).Injector (10) according to any one of the preceding claims wherein the flange (20) is provided with two grooves (28). Injecteur (10) selon l'une quelconque des revendications précédentes dans lequel la gorge (28) est hélicoïdale formant un filetage dans la paroi périphérique (26).Injector (10) according to any preceding claim wherein the groove (28) is helical forming a thread in the peripheral wall (26). Injecteur (10) selon l'une quelconque des revendications précédentes dans lequel au moins une des faces amont (22) ou avale (24) est pourvue d'un chanfrein (32) périphérique.Injector (10) according to any preceding claim wherein at least one of the upstream faces (22) or downstream (24) is provided with a peripheral chamfer (32).
EP13173947.6A 2013-06-27 2013-06-27 Fuel injector Withdrawn EP2818687A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13173947.6A EP2818687A1 (en) 2013-06-27 2013-06-27 Fuel injector
PCT/EP2014/062239 WO2014206753A1 (en) 2013-06-27 2014-06-12 Fuel injector

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EP13173947.6A EP2818687A1 (en) 2013-06-27 2013-06-27 Fuel injector

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EP2818687A1 true EP2818687A1 (en) 2014-12-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018036966A1 (en) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Fuel injector nozzle body

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388880B (en) * 2016-05-17 2019-04-05 四川日机密封件股份有限公司 Cross-circulation heat-exchanger rig

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000206A1 (en) * 2009-01-14 2010-07-15 Robert Bosch Gmbh Fuel injector for internal combustion engines
DE102010044088A1 (en) * 2010-11-18 2012-05-24 Robert Bosch Gmbh Nozzle assembly for fuel injector of internal combustion engine, comprises nozzle needle, which is guided into high pressure borehole of nozzle body for releasing and closing injection opening by guide portion
EP2568157A1 (en) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Injection Nozzle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000206A1 (en) * 2009-01-14 2010-07-15 Robert Bosch Gmbh Fuel injector for internal combustion engines
DE102010044088A1 (en) * 2010-11-18 2012-05-24 Robert Bosch Gmbh Nozzle assembly for fuel injector of internal combustion engine, comprises nozzle needle, which is guided into high pressure borehole of nozzle body for releasing and closing injection opening by guide portion
EP2568157A1 (en) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Injection Nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018036966A1 (en) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Fuel injector nozzle body

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