EP3921535B1 - Buse pour un injecteur de carburant - Google Patents

Buse pour un injecteur de carburant Download PDF

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Publication number
EP3921535B1
EP3921535B1 EP20704828.1A EP20704828A EP3921535B1 EP 3921535 B1 EP3921535 B1 EP 3921535B1 EP 20704828 A EP20704828 A EP 20704828A EP 3921535 B1 EP3921535 B1 EP 3921535B1
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EP
European Patent Office
Prior art keywords
nozzle
fuel
opening
nozzle needle
accordance
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
EP20704828.1A
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German (de)
English (en)
Other versions
EP3921535A1 (fr
Inventor
Klaus LICHTINGER
Thomas Atzkern
Markus HÖLLBACHER
Michael Schmid
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.)
Liebherr Components Deggendorf GmbH
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Liebherr Components Deggendorf GmbH
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Publication of EP3921535A1 publication Critical patent/EP3921535A1/fr
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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
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • 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
    • 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
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F02M51/0657—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow

Definitions

  • the present invention relates to a nozzle for a fuel injector and a fuel injector with such a nozzle.
  • Fuel injectors which are also called injection nozzles, are an essential component of every internal combustion engine, as they are used to introduce the required amount of fuel to be burned into the combustion chamber. For clean combustion, it is extremely important to maintain the injector opening and closing as quickly as possible over its entire service life in order to be able to continuously supply an exact amount of fuel.
  • nozzles for fuel injectors are typically known whose openings for discharging fuel under high pressure lead from a so-called blind hole.
  • the blind hole is a space arranged below the nozzle needle that can be moved in the longitudinal direction and which can be fluidically separated from a reservoir for fuel under high pressure by placing the nozzle needle on a seat area (see. Fig.3 ). If the nozzle needle is lifted from the seat area of the nozzle body, fuel flows into the blind hole and from there out of the nozzle via the openings. The nozzle needle is surrounded by fuel from the outside, which flows towards the openings.
  • the JP 2001 221132 A shows a nozzle that has all the features from the preamble of claim 1.
  • the nozzle therefore comprises, among other things, a rotationally symmetrical nozzle body with a cavity for inserting a nozzle needle, a nozzle tip which is provided at a longitudinal end of the nozzle body and has at least one opening for discharging fuel, and a nozzle needle arranged in the cavity for selectively blocking a fuel inflow to the at least one opening, wherein the nozzle needle is tubular in the area of the nozzle tip and is designed to direct fuel inside the tubular area to the at least one opening.
  • the nozzle needle is a tubular needle nozzle or a hollow needle, the interior of which is designed to carry fuel.
  • the outer circumference of the nozzle needle is constant in its third facing the nozzle tip, preferably in its half facing the nozzle tip. This is the outer circumference of the nozzle needle constant along its longitudinal direction in its half or third facing the tip. This significantly simplifies the production of the nozzle body.
  • This design is particularly advantageous in combination with the rounded end faces of the tubular area of the nozzle needle.
  • the rounded edges may preferably have the shape of a quarter circle in cross-section, the center of which is arranged on the outer circumference of the nozzle needle.
  • the nozzle according to the invention no longer requires the blind hole, which is largely responsible for the HC emissions (hydrocarbon emissions).
  • the structure according to the invention therefore achieves significant improvements in terms of emissions, in particular in terms of HC emissions, and results in lower consumption and a longer shelf life (due to less cavitation damage and improved quantity stability).
  • a fluidic connection from the at least one opening to a reservoir for receiving pressurized fuel advantageously runs exclusively through the tubular region of the nozzle needle.
  • the inflow of fuel to the at least one opening therefore takes place through the tubular section, which can also be embodied by a bore.
  • the fuel therefore no longer flows around the nozzle needle but flows in the nozzle needle in the direction of the fuel openings.
  • the nozzle needle by being placed on a seat surface of the nozzle body, interrupts a fluidic connection of the at least one opening to a reservoir for receiving pressurized fuel.
  • the nozzle needle has a front-side outlet opening at its end facing the nozzle tip, which can be closed by placing it on a seat surface of the nozzle body or the nozzle tip.
  • This outlet opening can be formed in one piece with the tubular section of the nozzle needle, so that fuel flowing through the nozzle needle exits the front side of the nozzle needle.
  • the nozzle tip in a cross section has a conical elevation towards the cavity for the nozzle needle, in particular in the form of a straight circular cone, the tip of which penetrates into the interior of the tubular region of the nozzle needle when the nozzle is in a closed state.
  • the nozzle tip has a flat surface or even a tapered structure, for example a tapered structure, on the side facing the nozzle needle.
  • the conical elevation has the advantage that escaping fuel only has to be diverted once, namely only at the conical elevation, from where it can be dispensed via the at least one opening without further redirection.
  • the at least one opening for discharging fuel adjoins the outer surface of the conical elevation, preferably in such a way that, when the nozzle needle is lifted off the conical elevation, fuel can flow out of the at least one opening in a straight line from the tubular region of the nozzle needle by deflecting once at the conical elevation.
  • a longitudinal inner edge of the at least one opening channel is aligned with the lateral surface, so that fuel can be guided continuously from the lateral surface into the opening.
  • the conical elevation and the nozzle needle are arranged coaxially to one another. This results in the tip of the conical elevation penetrating into the tubular section when the nozzle is in a closed state. If the front end sections of the tubular area now contact the conical elevation, the nozzle closes. Fuel can no longer flow from the interior of the nozzle needle in the direction of the at least one outlet opening.
  • a region of the lateral surface of the conical elevation, which encloses the tip of the conical elevation represents a seating area for the nozzle needle, which is contacted by the nozzle needle when the nozzle is in a closed state.
  • the nozzle needle advantageously has rounded edges in its end section facing the nozzle tip. This minimizes the area that contacts the conical elevation, so that there is sufficient sealing to interrupt fuel flow even with a relatively low force.
  • the at least one opening for discharging fuel cannot be connected to a blind hole.
  • the at least one opening for dispensing fuel now leads directly from the seat area and is preferably aligned with the surface of the conical elevation.
  • the at least one opening for discharging fuel is directed with its opening channel directly towards the seating area of the nozzle needle and/or extends directly from the seating area.
  • tubular region of the nozzle needle extends to its tip, so that the nozzle needle has a tubular outlet there.
  • the invention also includes the variant that the tubular region of the nozzle needle is rotationally symmetrical, and preferably the region of the nozzle needle facing the nozzle tip is rotationally symmetrical.
  • the outer circumference of the nozzle needle is constant in the half facing the nozzle tip, preferably in the third facing the nozzle tip. This enables a particularly simple design of the nozzle body. Only a few holes are then required for this.
  • the invention also relates to a fuel injector with a nozzle according to one of the preceding claims.
  • the fuel injector is provided with a reservoir for receiving pressurized fuel, with a fluidic connection of the reservoir to the at least one opening for discharging fuel running only through the interior of the tubular region of the nozzle needle. This preferably happens when the nozzle needle is lifted out of its fuel flow-interrupting state, in which the end faces of the nozzle needle no longer contact the associated seat surface of the nozzle tip.
  • the invention also relates to an engine with a nozzle according to one of the variants described above or a fuel injector as described above.
  • Fig. 1 shows a schematic view of a nozzle 1 according to the invention in a partially shown fuel injector 20.
  • the nozzle body 2 has a cavity 3 for receiving a nozzle needle 4, which is movably accommodated therein.
  • the nozzle needle 4 can be moved along its longitudinal axis according to the known principles for raising and lowering a nozzle needle 4, which are not limiting for the present invention.
  • the nozzle needle 4 has a tubular region 7 which is designed to direct fuel from a proximal region of the nozzle 1 to a distal region (i.e. towards the tip) of the nozzle 1.
  • the nozzle needle 3 can be designed as a tubular needle nozzle. It is also conceivable that the tubular region 7 is formed by a bore which runs coaxially to the longitudinal direction of the nozzle needle 4.
  • Fig.2 shows an enlarged view of an end region of the nozzle 1 according to the invention.
  • the nozzle tip 5 of the nozzle body 2 has a conical elevation 9 on the side facing the tubular region 7 of the nozzle needle 4, the tip of which projects into the interior of the tubular region 9.
  • the end faces of the nozzle needle 4 contact the conical elevation 9 on the so-called seat surface 10 and seal the interior of the nozzle needle 4 against the at least one outlet opening 6.
  • the end faces of the nozzle needle 4 are rounded (see reference numeral 11), so that a small contact surface with the conical elevation 9 already achieves the desired sealing. In addition, this makes it possible to achieve a seal in a reliable manner despite manufacturing tolerances.
  • Fig.3 shows a nozzle 1 in the area of the tip according to the prior art.
  • the nozzle body 2 has a recess 8 into which a nozzle needle 4 is inserted.
  • This nozzle needle 4 is - unlike according to the invention - solid and contacts an inner section of the nozzle body 2 in the area of the seat surface 10 at a peripheral area.
  • a blind hole 12 is provided below the seat surface 10, from which the openings 6 for the discharge of fuel from the nozzle 1 branch off. Due to this design, repeated deflection of fuel is necessary, which promotes the occurrence of cavitation damage.

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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)

Claims (15)

  1. Buse (1) pour un injecteur de carburant (20), comprenant :
    un corps de buse (2) à symétrie de rotation doté d'une cavité (3) permettant l'introduction d'une aiguille d'injection (4),
    une pointe de buse (5) qui est située sur une extrémité longitudinale du corps de buse (2) et qui présente au moins une ouverture (6) permettant la sortie de carburant, et
    une aiguille d'injection (4) disposée dans la cavité (3), destinée à bloquer de manière sélective un flux de carburant vers l'au moins une ouverture (6),
    l'aiguille d'injection (4) étant réalisée de forme tubulaire dans la zone de la pointe de buse (5) et conçue pour guider du carburant à l'intérieur de la zone tubulaire (7) jusqu'à l'au moins une ouverture (6), et
    la pointe de buse (5) présentant, en direction de la cavité (3) pour l'aiguille d'injection (4), une saillie (9) conique dont la pointe pénètre, dans un état fermé de la buse (1), à l'intérieur de la zone tubulaire (7) de l'aiguille d'injection (4),
    caractérisée en ce que
    l'au moins une ouverture (6) permettant la sortie de carburant est adjacente à la surface latérale de la saillie (9) conique,
    un bord intérieur longitudinal d'au moins un canal d'ouverture qui présente l'ouverture étant de niveau avec la surface latérale, de telle sorte que du carburant peut être amené dans l'ouverture à partir de la surface latérale sans paliers.
  2. Buse (1) selon la revendication 1, dans laquelle une liaison fluidique de l'au moins une ouverture (6) à un réservoir (8) destiné à recevoir du carburant sous pression s'étend exclusivement à travers la zone tubulaire (7) de l'aiguille d'injection (4).
  3. Buse (1) selon l'une des revendications précédentes, dans laquelle l'aiguille d'injection (4) interrompt, en se posant sur une surface de siège (10) du corps de buse (2), une liaison fluidique de l'au moins une ouverture (6) à un réservoir (8) destiné à recevoir du carburant sous pression.
  4. Buse (1) selon l'une des revendications précédentes, dans laquelle la saillie (9) conique est un cône circulaire droit.
  5. Buse (1) selon l'une des revendications précédentes, dans laquelle l'au moins une ouverture (6) permettant la sortie de carburant est adjacente à la surface latérale de la saillie (9) conique de telle manière que, dans un état dans lequel l'aiguille d'injection (4) est soulevée de la saillie (9) conique, un carburant provenant de la zone tubulaire (7) de l'aiguille d'injection (4) peut s'écouler de l'au moins une ouverture (6) en ligne droite par une déviation unique sur la saillie (9) conique.
  6. Buse (1) selon l'une des revendications précédentes 4 ou 5, dans laquelle la saillie (9) conique et l'aiguille d'injection (4) sont disposées de manière coaxiale l'une par rapport à l'autre.
  7. Buse (1) selon l'une des revendications précédentes 4 à 6, dans laquelle une zone de la surface latérale de la saillie (9) conique, qui entoure la pointe de la saillie (9) conique, représente une zone de siège pour l'aiguille d'injection (4), avec laquelle l'aiguille d'injection (4) vient en contact dans un état fermé de la buse (1).
  8. Buse (1) selon l'une des revendications précédentes, dans laquelle l'aiguille d'injection (4) présente, dans sa partie d'extrémité orientée vers la pointe de buse (5), des bords arrondis (11), et vient de préférence en contact avec la surface de siège (10) par les bords arrondis (11).
  9. Buse (1) selon l'une des revendications précédentes, dans laquelle l'au moins une ouverture (6) permettant la sortie de carburant n'est pas reliée à un trou borgne (12).
  10. Buse (1) selon l'une des revendications précédentes, dans laquelle l'au moins une ouverture (6) permettant la sortie de carburant est orientée avec son canal d'ouverture directement vers la zone de siège de l'aiguille d'injection (4) et/ou part directement de la zone de siège (10).
  11. Buse (1) selon l'une des revendications précédentes, dans laquelle la zone tubulaire (7) de l'aiguille d'injection (4) s'étend jusqu'à la pointe distale de celle-ci, de telle sorte que l'aiguille d'injection (4) y présente une sortie tubulaire.
  12. Buse (1) selon l'une des revendications précédentes, dans laquelle la zone tubulaire (7) de l'aiguille d'injection (4) est à symétrie de rotation et la zone de l'aiguille d'injection (4) orientée vers la pointe de buse (5) est de préférence à symétrie de révolution.
  13. Buse (1) selon l'une des revendications précédentes, dans laquelle la circonférence extérieure de l'aiguille d'injection (4) est constante dans sa moitié orientée vers la pointe de buse, de préférence dans son tiers orienté vers la pointe de buse.
  14. Injecteur de carburant (20) doté d'une buse (1) selon l'une des revendications précédentes.
  15. Injecteur de carburant (20) selon la revendication 14, comportant en outre un réservoir (8) destiné à recevoir du carburant sous pression, dans lequel une liaison fluidique du réservoir (8) à l'au moins une ouverture (6) permettant la sortie de carburant s'étend exclusivement à travers l'intérieur de la zone tubulaire (7) de l'aiguille d'injection (4).
EP20704828.1A 2019-02-12 2020-02-10 Buse pour un injecteur de carburant Active EP3921535B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019103511.2A DE102019103511A1 (de) 2019-02-12 2019-02-12 Düse für einen Kraftstoffinjektor
PCT/EP2020/053263 WO2020165072A1 (fr) 2019-02-12 2020-02-10 Buse pour un injecteur de carburant

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DE2843000A1 (de) * 1978-10-03 1980-04-24 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE3048304A1 (de) * 1980-12-20 1982-07-29 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoffeinspritzduese fuer brennkraftmaschinen"
DE3510075A1 (de) * 1985-03-20 1986-09-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Brennstoffeinspritzventil
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US8496191B2 (en) * 2008-05-19 2013-07-30 Caterpillar Inc. Seal arrangement for a fuel injector needle valve
DE102008039920A1 (de) * 2008-08-27 2010-03-04 Continental Automotive Gmbh Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
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WO2020165072A1 (fr) 2020-08-20
US20220154674A1 (en) 2022-05-19
CN113423945A (zh) 2021-09-21
CN113423945B (zh) 2024-02-06
DE102019103511A1 (de) 2020-08-13
EP3921535A1 (fr) 2021-12-15

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