EP3279465A1 - Injector nozzle body - Google Patents

Injector nozzle body Download PDF

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Publication number
EP3279465A1
EP3279465A1 EP17181021.1A EP17181021A EP3279465A1 EP 3279465 A1 EP3279465 A1 EP 3279465A1 EP 17181021 A EP17181021 A EP 17181021A EP 3279465 A1 EP3279465 A1 EP 3279465A1
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EP
European Patent Office
Prior art keywords
face
needle
female
bore
cylindrical
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.)
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Application number
EP17181021.1A
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German (de)
French (fr)
Inventor
Philippe Legrand
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
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Publication of EP3279465A1 publication Critical patent/EP3279465A1/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
    • F02M61/04—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
    • 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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188

Definitions

  • the invention relates to a fuel injector provided with a device for guiding the needle of the injector.
  • a fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber.
  • the needle is slidable within a bore of the nozzle body, wherein one end of the needle is sealingly provided with a nozzle seat provided on an inner surface of the bore of the nozzle body, to control the supply of fuel through spray holes located through the wall of the nozzle body.
  • the fuel is at high pressure and flows into the injector from the inlet channel to the injection holes.
  • the end of the needle expands and thus the clearance increases between the low guide and the needle up to values of 15 micrometers.
  • the needle can then be more widely misaligned and as a result slippage increases as the needle comes into contact with the nozzle seat before the needle reaches its seat completely and the injection stops.
  • the effect of this sliding is greater wear and closure time varying with each injection.
  • the object of the present invention is to provide a solution that overcomes these disadvantages.
  • the present invention proposes to solve these problems by a device for guiding the needle of the injector.
  • the fuel injector includes a nozzle body adapted to cooperate with a slidably adjusting needle to form a nozzle assembly of a fuel injector.
  • the nozzle assembly extends along the longitudinal axis.
  • the nozzle body comprises a wall peripheral and longitudinal extending along the longitudinal axis defining a longitudinal cylindrical bore open at a first end and terminating in a conical face at a second opposite end defining a valve seat adapted to cooperate with a complementary face of the needle.
  • the conical tip of the valve seat opens into a bag from which there are injection holes passing through said peripheral wall.
  • the nozzle body further comprises a needle guiding means comprising a high guide and a low guide in which a female cylindrical face of the bore and a complementary male face of the needle cooperate.
  • the cylindrical female face is in direct continuity with the nozzle seat.
  • the female cylindrical face has a diameter smaller than the diameter of the bore so that the female face is connected to the bore in at least one connecting face.
  • a nozzle assembly comprises a nozzle body provided with a female guide face as previously described and a valve needle slidably arranged in the bore comprising the complementary guide male face.
  • the cylindrical male face of the needle includes fuel passage conduits extending along the longitudinal axis.
  • the fuel passage ducts of the male cylindrical face of the needle are flats.
  • the needle has a diameter of the male face substantially equal to the diameter of the female cylindrical guide face.
  • an injector comprises a nozzle assembly as described above.
  • top-down orientation is chosen arbitrarily and, words and phrases such as "above, below, above, below, up, down " can be used without any intention to limit the invention.
  • FIG 1 there is described an embodiment of the invention relating to a fuel injector 10, here a diesel injector although the invention is fully transposable to a gas injector or any other fuel.
  • a fuel injector 10 here a diesel injector
  • the invention is fully transposable to a gas injector or any other fuel.
  • the description will detail the elements of the invention and will remain more succinct and general as to the surrounding elements.
  • the injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and non-limiting sense of the figures, a nozzle assembly 12 comprising a needle valve element 14 or commonly called needle 14 arranged in a body nozzle 16, a control valve assembly 18 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24.
  • the needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position in which the needle 14 is in contact with a nozzle body seat 38 and an open position where the needle is spaced from the seat 38.
  • the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high-pressure circuit from an inlet orifice arranged in an upper part of the injector 10 to the d injection 28 arranged in a lower part of the injector 10.
  • the nozzle body 16 extends along a longitudinal axis X.
  • the figure 2 is an exaggerated representation of the nozzle assembly 12 where the needle 14 is shown remote from the seat 38 when in fact the needle 14 remains close to the seat 38.
  • the nozzle body 16 is provided to cooperate with the valve needle 14 according to a sliding fit so as to form a nozzle assembly 12 of a fuel injector.
  • the nozzle body 16 comprises a peripheral and longitudinal wall 46 extending along the longitudinal axis X and a guide means 48 of the needle comprising a high guide 49 and a low guide 50. In the low guide 50, as described in figure 2 , cooperate a female cylindrical face 52 of the bore and a male face 54 complementary to the needle.
  • the peripheral wall 46 defines a longitudinal cylindrical bore 26 open at a first end 58 and ending in point 59 in a conical face 56 at a second opposite end 60 defining a valve seat 38 adapted to cooperate with a complementary face 62 of the 'needle.
  • the conical face 56 and the face 62 of the needle seal.
  • the tapered tip 59 of the valve seat opens into a bag 64 from which the injection holes 28 extend through said peripheral wall 46.
  • the male face 54 of the needle is slidably fitted to the female face 52 of the bore. functional game near.
  • the female cylindrical face 52 is in direct continuity with the nozzle seat 38.
  • the female face 52 extends along the longitudinal axis X.
  • the female face 52 is in the extension of the seat of the nozzle 38.
  • the bore 26 extends axially towards the valve seat 38 in parallel with the female face 52 so as to form an annular recess 68 surrounding the female cylindrical face 52.
  • the female face 52 is connected to the recess 68 by a flat face 55.
  • the plane face 55 is perpendicular to the longitudinal axis X.
  • the face 55 may have other shapes, such as a beveled shape, a shape in bias or any other form.
  • the nozzle body 16 is provided with an annular cylindrical wall 53 between the recess 68 and the female cylindrical face 52.
  • the thickness of the wall 53 is of the order of 0.2 mm to 0.4 mm.
  • the recess 68 may be of various shapes such as a semicircular or planar shaped bottom or any other shape.
  • the nozzle body 16 is provided with an annular groove 70 which is arranged at the intersection of the seat 38 and the cylindrical female face 52 of the bore.
  • the annular groove 70 is disposed between the bore 26 and the female face 52 of low guide.
  • the cylindrical female face 52 has a diameter D52 smaller than the diameter D26 of the bore.
  • the nozzle assembly 12 comprises a nozzle body 16 provided with the female face 52 and the needle 14 which is slidably arranged in the bore 26.
  • the needle 14 comprises the male guide face 54 complementary to the female face 52 of the bore.
  • the male cylindrical face 54 of the needle comprises fuel passage conduits 72 extending along the longitudinal axis X.
  • the fuel passage ducts 72 of the male cylindrical face 54 of the needle are flats 72.
  • the number of flats is 8 of which 4 are visible on the figure 2 but other flats 72 may be added or removed.
  • the flats 72 can be made by a grinding method or any other method.
  • the fuel passage conduits 72 may be longitudinal grooves or any other form allowing the passage of fuel.
  • the annular groove 70 of the nozzle body serves to equalize the fuel pressure arriving from the different fuel lines 72 before it reaches the nozzle seat 38 and the bag 64.
  • the needle 14 has a diameter DE14 less than the guide diameter DE52 of the female cylindrical face 52. The difference between the guide diameter DE52 and the diameter DE14 of the needle corresponds to the functional clearance to effect the sliding.
  • the needle 14 does not have fuel passage conduits 72.
  • the wall 53 then comprises longitudinal openings, for example at least 3 openings. The realization of these openings may be carried out for example by an electrochemical machining process.
  • the female cylindrical face 52 is connected to the bore 26 in at least one connecting face, for example by the extension of the perpendicular face 55, the face 55 being able to be a radial face, or inclined.
  • this alternative there is no annular recess 68.
  • the actuator 22 when the actuator 22 is electrically powered, it attracts the magnetic armature 30 and the valve stem 32 which are secured together, thereby opening the evacuation channel (not shown) and allowing the fuel enclosed in the control chamber 34 to evacuate to a low pressure circuit (not shown). Then the pressure decreases in the chamber of control 34 and the needle 14 moves in the bore 26 of the nozzle body to an open position in which a lower end 36 of the needle moves away from the seat 38 of the nozzle body. As a result, an upper end 40 of the needle contacts a lower face 42 of the valve body.
  • the magnetic armature assembly 30 and control rod 32 is pushed by a valve spring 44 to a position which prevents the fuel from flowing to the evacuation channel which is closed. , which retains the high-pressure fuel that gets there. Then the pressure in the control chamber 34 rises and the needle 14 is pushed down by a needle spring 45 and the lower end 36 of the needle is in contact with the nozzle seat 38 and the end upper 40 of the needle is remote from the lower face 42 of the valve body.

Abstract

Corps de buse (16) prévu pour coopérer avec une aiguille de vanne (14) selon un ajustement coulissant de sorte à former un ensemble de buse (12) d'un injecteur (10) de carburant s'étendant le long d'un axe longitudinal (X). Le corps de buse (16) comprend :
- une paroi (46) longitudinale s'étendant le long de l'axe longitudinal (X) définissant un alésage (26) cylindrique longitudinal ouvert à une première extrémité (58) et, se terminant en pointe selon une face conique (56) à une deuxième extrémité (60) définissant un siège de vanne (38) adapté à coopérer avec une face complémentaire (62) de l'aiguille,
- un moyen de guidage (48) de l'aiguille comprenant un guide haut (49) et un guide bas (50) dans lequel coopèrent une face femelle (52) de l'alésage et une face mâle (54) complémentaire de l'aiguille,
- caractérisé en ce que ladite face (52) est en continuité directe du siège de buse (38).

Figure imgaf001
A nozzle body (16) for cooperating with a valve needle (14) in a sliding fit to form a nozzle assembly (12) of a fuel injector (10) extending along an axis longitudinal (X). The nozzle body (16) comprises:
- a longitudinal wall (46) extending along the longitudinal axis (X) defining a longitudinal cylindrical bore (26) open at a first end (58) and terminating in a point on a conical face (56) to a second end (60) defining a valve seat (38) adapted to cooperate with a complementary face (62) of the needle,
- A guide means (48) of the needle comprising a high guide (49) and a low guide (50) in which cooperate a female face (52) of the bore and a male face (54) complementary to the needle,
characterized in that said face (52) is in direct continuity with the nozzle seat (38).
Figure imgaf001

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention est relative à un injecteur de carburant pourvu d'un dispositif de guidage de l'aiguille de l'injecteur.The invention relates to a fuel injector provided with a device for guiding the needle of the injector.

ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTIONBACKGROUND OF THE INVENTION

Un injecteur de carburant comprend classiquement une aiguille pilotée en ouverture et en fermeture en fonction de la pression régnant dans une chambre de contrôle. L'aiguille est coulissante à l'intérieur d'un alésage du corps de buse, dans lequel une extrémité de l'aiguille est agencée de manière étanche avec un siège de buse prévu sur une surface interne de l'alésage du corps de buse, afin de contrôler l'alimentation en carburant à travers des trous de pulvérisation située à travers la paroi du corps de buse. Le carburant est à haute pression et circule dans l'injecteur du canal d'entrée vers les trous d'injection. Lorsque le corps de buse est sous pression, l'extrémité de l'aiguille se dilate et ainsi le jeu augmente entre le guide bas et l'aiguille pouvant aller jusqu'à des valeurs de 15 micromètres. L'aiguille peut alors se désaxer plus largement et en conséquence le glissement augmente quand l'aiguille entre en contact avec le siège de buse avant que l'aiguille arrive complétement sur son siège et que l'injection s'arrête. L'effet de ce glissement est une usure plus importante ainsi qu'un délai de fermeture variant à chaque injection. L'objet de la présente invention est de fournir une solution qui résout ces inconvénients.A fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber. The needle is slidable within a bore of the nozzle body, wherein one end of the needle is sealingly provided with a nozzle seat provided on an inner surface of the bore of the nozzle body, to control the supply of fuel through spray holes located through the wall of the nozzle body. The fuel is at high pressure and flows into the injector from the inlet channel to the injection holes. When the nozzle body is under pressure, the end of the needle expands and thus the clearance increases between the low guide and the needle up to values of 15 micrometers. The needle can then be more widely misaligned and as a result slippage increases as the needle comes into contact with the nozzle seat before the needle reaches its seat completely and the injection stops. The effect of this sliding is greater wear and closure time varying with each injection. The object of the present invention is to provide a solution that overcomes these disadvantages.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention se propose de résoudre ces problèmes par un dispositif de guidage de l'aiguille de l'injecteur. L'injecteur de carburant comprend un corps de buse prévu pour coopérer avec une aiguille ajuster coulissante de sorte à former un ensemble de buse d'un injecteur de carburant. L'ensemble de buse s'étend le long de l'axe longitudinal. Le corps de buse comprend une paroi périphérique et longitudinale s'étendant le long de l'axe longitudinal définissant un alésage cylindrique longitudinal ouvert à une première extrémité et, se terminant en pointe selon une face conique à une deuxième extrémité opposée définissant un siège de vanne adapté à coopérer avec une face complémentaire de l'aiguille. La pointe conique du siège de vanne s'ouvre dans un sac duquel partent des trous d'injection traversant ladite paroi périphérique. Le corps de buse comprend de plus un moyen de guidage de l'aiguille comprenant un guide haut et un guide bas dans lequel coopèrent une face cylindrique femelle de l'alésage et une face mâle complémentaire de l'aiguille. La face cylindrique femelle est en continuité directe du siège de buse. De plus la face cylindrique femelle a un diamètre inférieur au diamètre de l'alésage de sorte que la face femelle se raccorde à l'alésage selon au moins une face de raccordement.The present invention proposes to solve these problems by a device for guiding the needle of the injector. The fuel injector includes a nozzle body adapted to cooperate with a slidably adjusting needle to form a nozzle assembly of a fuel injector. The nozzle assembly extends along the longitudinal axis. The nozzle body comprises a wall peripheral and longitudinal extending along the longitudinal axis defining a longitudinal cylindrical bore open at a first end and terminating in a conical face at a second opposite end defining a valve seat adapted to cooperate with a complementary face of the needle. The conical tip of the valve seat opens into a bag from which there are injection holes passing through said peripheral wall. The nozzle body further comprises a needle guiding means comprising a high guide and a low guide in which a female cylindrical face of the bore and a complementary male face of the needle cooperate. The cylindrical female face is in direct continuity with the nozzle seat. In addition the female cylindrical face has a diameter smaller than the diameter of the bore so that the female face is connected to the bore in at least one connecting face.

L'alésage s'étend axialement vers le siège de vanne en parallèle de la face femelle de sorte à former un évidement annulaire entourant la face cylindrique femelle et définissant ainsi un muret cylindrique annulaire entre l'évidement et la face femelle cylindrique. De plus le corps de bus comprend une gorge annulaire agencée à l'intersection du siège et de la face cylindrique femelle de l'alésage. De plus un ensemble de buse comprend un corps de buse pourvu d'une face femelle de guidage comme décrit précédemment et une aiguille de vanne agencée coulissante dans l'alésage comprenant la face male de guidage complémentaire. De plus la face male cylindrique de l'aiguille comprend des conduits de passage de carburant s'étendant le long de l'axe longitudinal. Dans un mode de réalisation les conduits de passage de carburant de la face cylindrique male de l'aiguille sont des méplats. De plus l'aiguille présente un diamètre de la face male sensiblement égale au diamètre de la face cylindrique femelle de guidage. De plus un injecteur comprend un ensemble de buse tel que décrit précédemment.The bore extends axially towards the valve seat in parallel with the female face so as to form an annular recess surrounding the female cylindrical face and thus defining an annular cylindrical wall between the recess and the cylindrical female face. In addition, the bus body comprises an annular groove arranged at the intersection of the seat and the cylindrical female face of the bore. In addition, a nozzle assembly comprises a nozzle body provided with a female guide face as previously described and a valve needle slidably arranged in the bore comprising the complementary guide male face. In addition, the cylindrical male face of the needle includes fuel passage conduits extending along the longitudinal axis. In one embodiment, the fuel passage ducts of the male cylindrical face of the needle are flats. In addition, the needle has a diameter of the male face substantially equal to the diameter of the female cylindrical guide face. In addition, an injector comprises a nozzle assembly as described above.

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 va suivre, et en regard des dessins annexés, donnés à titre d'exemple non limitatif:

  • Figure 1 est une coupe axiale de l'injecteur selon l'invention.
  • Figure 2 est une coupe axiale de l'invention selon un mode de réalisation.
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:
  • Figure 1 is an axial section of the injector according to the invention.
  • Figure 2 is an axial section of the invention according to one embodiment.

DESCRIPTION DES MODES DE REALISATION PRÉFÉRÉSDESCRIPTION OF PREFERRED EMBODIMENTS

Pour faciliter et clarifier la description qui suit, l'orientation de haut en bas est choisi arbitrairement et, les mots et expressions tels que "ci-dessus, dessous, dessus, dessous, haut, bas ..." peuvent être utilisés sans aucune intention de limiter l'invention.To facilitate and clarify the following description, the top-down orientation is chosen arbitrarily and, words and phrases such as "above, below, above, below, up, down ..." can be used without any intention to limit the invention.

Selon la figure 1, est décrit un mode de réalisation de l'invention se rapportant à un injecteur 10 de carburant, ici un injecteur diesel bien que l'invention soit intégralement transposable à un injecteur essence ou de tout autre carburant. La description détaillera les éléments de l'invention et restera plus succincte et générale quant aux éléments environnants.According to figure 1 , there is described an embodiment of the invention relating to a fuel injector 10, here a diesel injector although the invention is fully transposable to a gas injector or any other fuel. The description will detail the elements of the invention and will remain more succinct and general as to the surrounding elements.

L'injecteur 10 s'étend selon un axe longitudinal X et comprend de bas en haut, selon le sens conventionnel et non limitatif des figures, un ensemble de buse 12 comprenant un élément de vanne aiguille 14 ou communément appelé aiguille 14 agencée dans un corps de buse 16, un ensemble de vanne de contrôle 18 agencé dans un corps de vanne 20, un actionneur 22 agencé dans un corps d'actionneur 24. L'aiguille 14 est agencée axialement coulissante dans un alésage 26 cylindrique longitudinal du corps de buse entre une position fermée dans laquelle l'aiguille 14 est en contact avec un siège 38 de corps de buse et une position ouverte où l'aiguille est écarté du siège 38.The injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and non-limiting sense of the figures, a nozzle assembly 12 comprising a needle valve element 14 or commonly called needle 14 arranged in a body nozzle 16, a control valve assembly 18 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24. The needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position in which the needle 14 is in contact with a nozzle body seat 38 and an open position where the needle is spaced from the seat 38.

Comme décrit dans la figure 1, l'injecteur 10 est pourvu d'un circuit de circulation de carburant qui permet d'amener du carburant haute pression via un circuit haute pression depuis un orifice d'entrée agencé dans une partie haute de l'injecteur 10 jusqu'aux trous d'injection 28 agencés dans une partie basse de l'injecteur 10.As described in figure 1 , the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high-pressure circuit from an inlet orifice arranged in an upper part of the injector 10 to the d injection 28 arranged in a lower part of the injector 10.

Dans un mode de réalisation de l'invention et selon les figures 1 et 2, le corps de buse 16 s'étend le long d'un axe longitudinal X. La figure 2 est une représentation exagérée de l'ensemble de buse 12 où l'aiguille 14 est représentée éloignée du siège 38 alors qu'en fait l'aiguille 14 reste à proximité du siège 38. Le corps de buse 16 est prévu pour coopérer avec l'aiguille de vanne 14 selon un ajustement coulissant de sorte à former un ensemble de buse 12 d'un injecteur de carburant. Le corps de buse 16 comprend une paroi 46 périphérique et longitudinale s'étendant le long de l'axe longitudinal X et un moyen de guidage 48 de l'aiguille comprenant un guide haut 49 et un guide bas 50. Dans le guide bas 50, comme décrit dans la figure 2, coopèrent une face cylindrique femelle 52 de l'alésage et une face mâle 54 complémentaire de l'aiguille. La paroi périphérique 46 définit un alésage 26 cylindrique longitudinal ouvert à une première extrémité 58 et, se terminant en pointe 59 selon une face conique 56 à une deuxième extrémité opposée 60 définissant un siège de vanne 38 adapté à coopérer avec une face complémentaire 62 de l'aiguille. La face conique 56 et la face 62 de l'aiguille assurent l'étanchéité. La pointe conique 59 du siège de vanne s'ouvre dans un sac 64 duquel partent les trous d'injection 28 traversant ladite paroi périphérique 46. La face 54 male de l'aiguille est ajustée coulissante sur la face femelle 52 de l'alésage au jeu fonctionnel près.In one embodiment of the invention and according to figures 1 and 2 , the nozzle body 16 extends along a longitudinal axis X. The figure 2 is an exaggerated representation of the nozzle assembly 12 where the needle 14 is shown remote from the seat 38 when in fact the needle 14 remains close to the seat 38. The nozzle body 16 is provided to cooperate with the valve needle 14 according to a sliding fit so as to form a nozzle assembly 12 of a fuel injector. The nozzle body 16 comprises a peripheral and longitudinal wall 46 extending along the longitudinal axis X and a guide means 48 of the needle comprising a high guide 49 and a low guide 50. In the low guide 50, as described in figure 2 , cooperate a female cylindrical face 52 of the bore and a male face 54 complementary to the needle. The peripheral wall 46 defines a longitudinal cylindrical bore 26 open at a first end 58 and ending in point 59 in a conical face 56 at a second opposite end 60 defining a valve seat 38 adapted to cooperate with a complementary face 62 of the 'needle. The conical face 56 and the face 62 of the needle seal. The tapered tip 59 of the valve seat opens into a bag 64 from which the injection holes 28 extend through said peripheral wall 46. The male face 54 of the needle is slidably fitted to the female face 52 of the bore. functional game near.

Selon la figure 2, la face cylindrique femelle 52 est en continuité directe du siège de buse 38. La face femelle 52 s'étend le long de l'axe longitudinal X. La face femelle 52 est dans le prolongement du siège du buse 38. L'alésage 26 s'étend axialement vers le siège de vanne 38 en parallèle de la face femelle 52 de sorte à former un évidement annulaire 68 entourant la face cylindrique femelle 52. Selon la figure 2 la face femelle 52 est raccordée à l'évidement 68 par une face plane 55. La face plane 55 est perpendiculaire à l'axe longitudinal X. La face 55 peut avoir d'autre forme, comme par exemple une forme biseautée, une forme en biais ou toute autre forme. Le corps de buse 16 est pourvu d'un muret 53 cylindrique annulaire entre l'évidement 68 et la face cylindrique femelle 52. L'épaisseur du muret 53 est de l'ordre de 0,2mm à 0,4mm. L'évidement 68 peut être de formes variées comme un fond de forme semi circulaire ou plan ou toute autre forme. Le corps de buse 16 est pourvu d'une gorge annulaire 70 qui est agencée à l'intersection du siège 38 et de la face cylindrique femelle 52 de l'alésage. La gorge annulaire 70 est disposée entre l'alésage 26 et la face femelle 52 de guidage bas. La face cylindrique femelle 52 a un diamètre D52 inférieur au diamètre D26 de l'alésage. L'ensemble de buse 12 comprend un corps de buse 16 pourvu de la face femelle 52 et l'aiguille 14 qui est agencée coulissante dans l'alésage 26. L'aiguille 14 comprend la face de guidage male 54 complémentaire à la face femelle 52 de l'alésage. La face cylindrique male 54 de l'aiguille comprend des conduits de passage de carburant 72 s'étendant le long de l'axe longitudinal X. Selon la figure 2, les conduits de passage de carburant 72 de la face cylindrique male 54 de l'aiguille sont des méplats 72. Le nombre de méplats est de 8 dont 4 sont visibles sur la figure 2 mais d'autres méplats 72 peuvent être ajoutés ou retirés. Les méplats 72 peuvent être réalisés par un procédé de rectification ou tout autre procédé. Dans d'autres alternatives non représentées les conduits de passage de carburant 72 peuvent être des gorges longitudinales ou toutes autres formes permettant le passage de carburant. De plus la gorge annulaire 70 du corps de buse sert à égaliser la pression du carburant arrivant des différents conduits de carburant 72 avant que celui-ci n'atteigne le siège de buse 38 et le sac 64. L'aiguille 14 présente un diamètre DE14 inférieur au diamètre de guidage DE52 de la face cylindrique femelle 52. La différence entre le diamètre de guidage DE52 et le diamètre DE14 de l'aiguille correspond au jeu fonctionnel pour réaliser le coulissement.According to figure 2 the female cylindrical face 52 is in direct continuity with the nozzle seat 38. The female face 52 extends along the longitudinal axis X. The female face 52 is in the extension of the seat of the nozzle 38. The bore 26 extends axially towards the valve seat 38 in parallel with the female face 52 so as to form an annular recess 68 surrounding the female cylindrical face 52. figure 2 the female face 52 is connected to the recess 68 by a flat face 55. The plane face 55 is perpendicular to the longitudinal axis X. The face 55 may have other shapes, such as a beveled shape, a shape in bias or any other form. The nozzle body 16 is provided with an annular cylindrical wall 53 between the recess 68 and the female cylindrical face 52. The thickness of the wall 53 is of the order of 0.2 mm to 0.4 mm. The recess 68 may be of various shapes such as a semicircular or planar shaped bottom or any other shape. The nozzle body 16 is provided with an annular groove 70 which is arranged at the intersection of the seat 38 and the cylindrical female face 52 of the bore. The annular groove 70 is disposed between the bore 26 and the female face 52 of low guide. The cylindrical female face 52 has a diameter D52 smaller than the diameter D26 of the bore. The nozzle assembly 12 comprises a nozzle body 16 provided with the female face 52 and the needle 14 which is slidably arranged in the bore 26. The needle 14 comprises the male guide face 54 complementary to the female face 52 of the bore. The male cylindrical face 54 of the needle comprises fuel passage conduits 72 extending along the longitudinal axis X. According to the figure 2 , the fuel passage ducts 72 of the male cylindrical face 54 of the needle are flats 72. The number of flats is 8 of which 4 are visible on the figure 2 but other flats 72 may be added or removed. The flats 72 can be made by a grinding method or any other method. In other alternatives not shown, the fuel passage conduits 72 may be longitudinal grooves or any other form allowing the passage of fuel. In addition, the annular groove 70 of the nozzle body serves to equalize the fuel pressure arriving from the different fuel lines 72 before it reaches the nozzle seat 38 and the bag 64. The needle 14 has a diameter DE14 less than the guide diameter DE52 of the female cylindrical face 52. The difference between the guide diameter DE52 and the diameter DE14 of the needle corresponds to the functional clearance to effect the sliding.

Dans une alternative non représentée du mode de réalisation, l'aiguille 14 ne présente pas de conduits de passage de carburant 72. Le muret 53 comprend alors des ouvertures longitudinales, par exemple au moins 3 ouvertures. La réalisation de ces ouvertures pourra être réalisée par exemple par un procédé d'usinage électrochimique.In a not shown alternative of the embodiment, the needle 14 does not have fuel passage conduits 72. The wall 53 then comprises longitudinal openings, for example at least 3 openings. The realization of these openings may be carried out for example by an electrochemical machining process.

Dans une seconde alternative non représentée au mode de réalisation la face cylindrique femelle 52 se raccorde à l'alésage 26 selon au moins une face de raccordement, par exemple par le prolongement de la face perpendiculaire 55, la face 55 pouvant être une face radiale, ou incliné. Dans cette alternative il n'y a pas d'évidement annulaire 68.In a second alternative not shown in the embodiment, the female cylindrical face 52 is connected to the bore 26 in at least one connecting face, for example by the extension of the perpendicular face 55, the face 55 being able to be a radial face, or inclined. In this alternative there is no annular recess 68.

Dans ce chapitre nous allons décrire le fonctionnement de l'injecteur.In this chapter we will describe the operation of the injector.

Comme décrit dans la figure 1, lorsque l'actionneur 22 est électriquement alimenté, il attire l'armature magnétique 30 et la tige de vanne 32 qui sont fixés ensemble, ce qui ouvre le canal d'évacuation (non représenté) et permet au carburant enfermé dans la chambre de contrôle 34 de s'évacuer vers un circuit basse pression (non représenté). Alors la pression diminue dans la chambre de contrôle 34 et l'aiguille 14 se déplace dans l'alésage 26 du corps de buse vers une position ouverte dans laquelle une extrémité inférieure 36 de l'aiguille s'éloigne du siège 38 du corps de buse. Par voie de conséquence une extrémité supérieure 40 de l'aiguille vient au contact d'une face inférieure 42 du corps de vanne.As described in figure 1 when the actuator 22 is electrically powered, it attracts the magnetic armature 30 and the valve stem 32 which are secured together, thereby opening the evacuation channel (not shown) and allowing the fuel enclosed in the control chamber 34 to evacuate to a low pressure circuit (not shown). Then the pressure decreases in the chamber of control 34 and the needle 14 moves in the bore 26 of the nozzle body to an open position in which a lower end 36 of the needle moves away from the seat 38 of the nozzle body. As a result, an upper end 40 of the needle contacts a lower face 42 of the valve body.

Lorsque l'actionneur 22 n'est pas alimenté, l'ensemble armature magnétique 30 et tige de commande 32 est repoussé par un ressort de vanne 44 vers une position qui empêche au carburant de s'écouler vers le canal d'évacuation qui est fermé, ce qui retient le carburant à haute pression qui y arrive. Alors la pression dans la chambre de contrôle 34 remonte et l'aiguille 14 est repoussée vers le bas par un ressort 45 d'aiguille et l'extrémité inférieure 36 de l'aiguille est en contact avec le siège 38 de buse et l'extrémité supérieure 40 de l'aiguille est éloignée de la face inférieure 42 du corps de vanne.When the actuator 22 is not energized, the magnetic armature assembly 30 and control rod 32 is pushed by a valve spring 44 to a position which prevents the fuel from flowing to the evacuation channel which is closed. , which retains the high-pressure fuel that gets there. Then the pressure in the control chamber 34 rises and the needle 14 is pushed down by a needle spring 45 and the lower end 36 of the needle is in contact with the nozzle seat 38 and the end upper 40 of the needle is remote from the lower face 42 of the valve body.

Les références suivantes ont été utilisées dans la description:

10
injecteur
12
ensemble de buse
14
element de vanne
16
corps de buse
18
ensemble de vanne de contrôle
20
corps de vanne
22
actionneur
24
corps d'actionneur
26
alésage
28
trous d'injection
30
armature
32
tige de vanne
34
chambre de contrôle
36
extrémité inférieure de l'aiguille
38
siège
40
extrémité supérieure de l'aiguille
42
face inférieure
44
ressort de vanne
45
ressort d'aiguille
46
paroi périphérique
48
moyen de guidage
49
guide haut
50
guide bas
52
face cylindrique femelle
53
muret
54
face mâle
55
face supérieure du muret
56
face conique
58
première extrémité
59
pointe
60
deuxième extrémité
62
face de l'aiguille
64
sac
68
évidement
70
gorge annulaire
72
conduits de passage de carburant
X
Axe longitudinal
D14
Diamètre de l'aiguille
D26
Diamètre de l'alésage
D52
Diamètre de la face femelle
The following references were used in the description:
10
injector
12
nozzle set
14
valve element
16
nozzle body
18
control valve assembly
20
valve body
22
actuator
24
actuator body
26
bore
28
injection holes
30
armature
32
valve stem
34
Control Chamber
36
lower end of the needle
38
seat
40
upper end of the needle
42
lower side
44
valve spring
45
needle spring
46
peripheral wall
48
guide way
49
guide up
50
low guide
52
female cylindrical face
53
wall
54
male face
55
upper face of the wall
56
conical face
58
first end
59
point
60
second end
62
face of the needle
64
bag
68
recess
70
annular groove
72
fuel passage ducts
X
Longitudinal axis
D14
Diameter of the needle
D26
Diameter of the bore
D52
Diameter of the female face

Claims (8)

Corps de buse (16) prévu pour coopérer avec une aiguille de vanne (14) selon un ajustement coulissant de sorte à former un ensemble de buse (12) d'un injecteur (10) de carburant s'étendant le long d'un axe longitudinal (X), le corps de buse (16) comprenant : - une paroi (46) périphérique et longitudinale s'étendant le long de l'axe longitudinal (X) définissant un alésage (26) cylindrique longitudinal ouvert à une première extrémité (58) et, se terminant en pointe selon une face conique (56) à une deuxième extrémité opposée (60) définissant un siège de vanne (38) adapté à coopérer avec une face complémentaire (62) de l'aiguille, la pointe conique du siège de vanne (38) s'ouvrant dans un sac (64) duquel partent des trous d'injection (28) traversant ladite paroi périphérique (46), - un moyen de guidage (48) de l'aiguille comprenant un guide haut (49) et un guide bas (50) dans lequel coopèrent une face cylindrique femelle (52) de l'alésage et une face mâle (54) complémentaire de l'aiguille, caractérisé en ce que ladite face cylindrique femelle (52) est en continuité directe du siège de buse (38) et,
en ce que l'alésage (26) s'étend axialement vers le siège de vanne (38) en parallèle de la face femelle (52) de sorte à former un évidement annulaire (68) entourant la face cylindrique femelle (52) et définissant ainsi un muret (53) cylindrique annulaire entre l'évidement (68) et la face (52) femelle cylindrique.A nozzle body (16) for cooperating with a valve needle (14) in a sliding fit to form a nozzle assembly (12) of a fuel injector (10) extending along an axis longitudinal (X), the nozzle body (16) comprising: a peripheral and longitudinal wall (46) extending along the longitudinal axis (X) defining a longitudinal cylindrical bore (26) open at a first end (58) and ending in a point along a conical face (56); ) at an opposite second end (60) defining a valve seat (38) adapted to cooperate with a complementary face (62) of the needle, the conical tip of the valve seat (38) opening in a bag (64). ) from which injection holes (28) extend through said peripheral wall (46), a guide means (48) for the needle comprising a high guide (49) and a low guide (50) in which a female cylindrical face (52) of the bore and a male face (54) complementary to the bore 'needle, characterized in that said female cylindrical face (52) is in direct continuity with the nozzle seat (38) and,
in that the bore (26) extends axially towards the valve seat (38) in parallel with the female face (52) so as to form an annular recess (68) surrounding the female cylindrical face (52) and defining and an annular cylindrical wall (53) between the recess (68) and the cylindrical female face (52). Corps de buse (16) selon la revendication précédente dans lequel la face cylindrique femelle (52) a un diamètre (DE52) inférieur au diamètre (DE26) de l'alésage de sorte que la face femelle (52) se raccorde à l'alésage (26) selon au moins une face de raccordement (55).Nozzle body (16) according to the preceding claim wherein the female cylindrical face (52) has a diameter (DE52) smaller than the diameter (DE26) of the bore so that the female face (52) is connected to the bore (26) according to at least one connecting face (55). Corps de buse (16) selon l'une quelconque des revendications 1 à 2 dans lequel une gorge annulaire (70) est agencée à l'intersection du siège (38) et de la face (52) cylindrique femelle de l'alésage.Nozzle body (16) according to any one of claims 1 to 2 wherein an annular groove (70) is arranged at the intersection of the seat (38) and the cylindrical female face (52) of the bore. Ensemble de buse (12) comprenant un corps de buse (16) pourvu d'une face femelle (52) de guidage selon l'une quelconque des revendications 1 à 3 et une aiguille de vanne (14) agencée coulissante dans l'alésage (26) comprenant la face male (54) de guidage complémentaire.A nozzle assembly (12) comprising a nozzle body (16) having a female guide face (52) as claimed in any one of claims 1 to 3 and a valve needle (14) slidably disposed in the bore ( 26) comprising the complementary guide male face (54). Ensemble de buse (12) selon la revendication 4 dans lequel la face male (54) cylindrique de l'aiguille comprend des conduits de passage de carburant (72) s'étendant le long de l'axe longitudinal (X).The nozzle assembly (12) of claim 4 wherein the cylindrical male (54) face of the needle includes fuel passage conduits (72) extending along the longitudinal axis (X). Ensemble de buse (12) selon la revendication 5 dans lequel des conduits de passage de carburant (72) de la face cylindrique male de l'aiguille sont des méplats (72).The nozzle assembly (12) of claim 5 wherein fuel passage conduits (72) of the male cylindrical face of the needle are flats (72). Ensemble de buse (12) selon l'une quelconque des revendications 4 à 6 dans lequel l'aiguille (14) présente un diamètre (DE14) de la face male (54) sensiblement égale au diamètre (DE52) de la face cylindrique femelle (52) de guidage.A nozzle assembly (12) according to any one of claims 4 to 6 wherein the needle (14) has a diameter (DE14) of the male face (54) substantially equal to the diameter (DE52) of the female cylindrical face ( 52). Injecteur comprenant un ensemble de buse (12) selon la revendication 7.Injector comprising a nozzle assembly (12) according to claim 7.
EP17181021.1A 2016-08-01 2017-07-12 Injector nozzle body Withdrawn EP3279465A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1601178A FR3054614A1 (en) 2016-08-01 2016-08-01 INJECTOR NOZZLE BODY

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ID=57485547

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EP (1) EP3279465A1 (en)
FR (1) FR3054614A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195515A2 (en) * 2000-10-04 2002-04-10 Robert Bosch Gmbh Fuel injector
WO2003067076A1 (en) * 2002-02-05 2003-08-14 Robert Bosch Gmbh Fuel injection valve
US20110180635A1 (en) * 2010-01-25 2011-07-28 Continental Automotive Systems Us, Inc. High Pressure Fuel Injector Seat That Resists Distortion During Welding
EP2799706A1 (en) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Injection nozzles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195515A2 (en) * 2000-10-04 2002-04-10 Robert Bosch Gmbh Fuel injector
WO2003067076A1 (en) * 2002-02-05 2003-08-14 Robert Bosch Gmbh Fuel injection valve
US20110180635A1 (en) * 2010-01-25 2011-07-28 Continental Automotive Systems Us, Inc. High Pressure Fuel Injector Seat That Resists Distortion During Welding
EP2799706A1 (en) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Injection nozzles

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