EP3362671B1 - Injecteur piézoélectrique pour l'injection de carburant - Google Patents

Injecteur piézoélectrique pour l'injection de carburant Download PDF

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Publication number
EP3362671B1
EP3362671B1 EP16779084.9A EP16779084A EP3362671B1 EP 3362671 B1 EP3362671 B1 EP 3362671B1 EP 16779084 A EP16779084 A EP 16779084A EP 3362671 B1 EP3362671 B1 EP 3362671B1
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EP
European Patent Office
Prior art keywords
coupler
nozzle needle
piston
piezo injector
coupler piston
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.)
Active
Application number
EP16779084.9A
Other languages
German (de)
English (en)
Other versions
EP3362671A1 (fr
EP3362671B8 (fr
Inventor
Gerd Schmutzler
Christoph Heukenroth
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.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP3362671A1 publication Critical patent/EP3362671A1/fr
Publication of EP3362671B1 publication Critical patent/EP3362671B1/fr
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Publication of EP3362671B8 publication Critical patent/EP3362671B8/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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/08—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 the valves opening in direction of 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/708—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with hydraulic chambers formed by a movable sleeve

Definitions

  • the invention relates to a piezo injector for fuel injection, in particular for direct fuel injection in an internal combustion engine.
  • a piezo injector for direct fuel injection which has a hydraulic coupler unit between the piezo actuator and the nozzle needle.
  • the hydraulic coupler has a coupler piston, a coupler cylinder and a coupler spring, wherein the coupler piston is pressed by means of the coupler spring against an end face of the nozzle needle facing the coupler piston.
  • the filling and pressure equalization of the coupler volume are ensured by the mating clearance between coupler piston and coupler cylinder.
  • the mating clearance is designed as small as possible so that the coupler keeps the needle stroke almost constant over a control time of up to 5 ms.
  • the pressure equalization between the coupler volume and the surrounding fuel volume at such a small mating game requires a certain time, which, depending on the time duration until the next injection process for influencing the coupler function with respect to the transmitted stroke.
  • the coupler volume between coupler cylinder and coupler piston may not be filled up fast enough.
  • US 2003/127617 A1 discloses a valve for controlling fluids for storage injection systems including a hydraulic coupler and a piezoelectric actuator.
  • the hydraulic coupler includes a first piston, a second piston and a coupling chamber disposed between the two pistons.
  • the piezoelectric actuator is in communication with the first piston.
  • the first piston is designed substantially cup-shaped, and the second piston is arranged in a recess in the first piston.
  • the coupling chamber is disposed between the second piston and an inner bottom portion of the first piston.
  • a piezo injector for fuel injection which comprises a nozzle unit with a nozzle needle movably arranged in a nozzle needle, a piezoelectric actuator unit and a hydraulic coupler unit for coupling the nozzle unit with the actuator unit.
  • the hydraulic coupler unit has a coupler piston, a coupler cylinder and a coupler spring.
  • the coupler piston has a top side facing the coupler cylinder and a bottom side facing the nozzle needle.
  • the coupler cylinder is open to the nozzle needle, preferably so that the coupler piston is exposed.
  • the coupler cylinder has a bottom.
  • the fact that the upper side of the coupler piston faces the coupler cylinder means, in particular, that the upper side faces the bottom of the coupler cylinder. Between the bottom of the coupler cylinder and the top of the coupler piston, the coupler volume is formed.
  • the coupler piston is pressed by the coupler spring against one of the underside of the coupler piston facing end face of the nozzle needle and has a contact surface with the nozzle needle.
  • the coupler piston has a through opening which provides flow communication from its bottom to its top and which is disposed within the interface with the nozzle needle.
  • the passage opening extends from an opening at the top to an opening at the bottom through the coupler piston.
  • the fact that the passage opening is arranged within the contact surface with the nozzle needle means in particular that the opening of the passage opening arranged on the underside completely overlaps with the nozzle needle in a plan view of the end face.
  • the end face of the nozzle needle and the underside of the coupler piston are designed and arranged such that the opening of the passage opening arranged on the underside can be closed by means of the end face of the nozzle needle.
  • the piezoelectric actuator unit is mechanically connected to the coupler cylinder, in particular rigidly connected, so that a change in length of the piezoelectric actuator unit causes a displacement of the coupler cylinder along a longitudinal axis.
  • the function of the hydraulic coupler unit is no longer dependent on the time interval between the injections, but is very quickly available again.
  • the passage opening in the coupler piston improves the fillability of the coupler volume after the initial assembly or in case of service after a change of the injector.
  • the hydraulic coupler unit is arranged in particular in the nozzle body and the coupler volume can be filled by means of the fuel flowing through the nozzle body to the fuel outlet.
  • the pairing game is understood to be, in particular, the lateral mating play - in particular between a circumferential side wall of the coupler cylinder and the outer surface of the coupler piston.
  • a contact surface of the coupler piston with the nozzle needle is understood here and below to mean a surface on the surface of the coupler piston, in particular on its underside facing the nozzle needle, which is contacted by the nozzle needle.
  • the contact can also take place along a line, in particular a circular line, so that a sealing edge is formed between the coupler piston and the nozzle needle.
  • the contact surface is then understood to be the surface of the coupler piston enclosed by this line.
  • the passage opening in the coupler piston is typically completely sealable by the nozzle needle.
  • the passage opening thus forms, together with the nozzle needle, a valve which opens when a gap between the coupler piston and the nozzle needle remains due to the leakage of fuel from the coupler volume at the injection end.
  • the geometry of the coupler piston and the end face of the nozzle needle may be flat, convex or concave.
  • These different types of training and in particular their combination affect the inflow behavior of fuel.
  • the radial flow area available for pressure compensation can be increased or decreased independently of the diameter of the passage opening itself.
  • a newly formed contact surface and a newly formed end face of the nozzle needle have the advantage that the production is particularly simple.
  • a concave contact surface together with a convex end face or vice versa a convex contact surface in connection with a concave end face has the advantage that a centering of the coupler piston and the nozzle needle takes place.
  • the front side and / or the contact surface may be formed in particular spherical or conical.
  • the nozzle needle is in particular designed to open outward.
  • the needle seat of the nozzle needle may be formed as a conical surface, which is pressed in the nozzle body against a hollow cone surface, so that a sealing function is achieved.
  • a fuel film having a thickness in the range of 0.01 mm to 0.7 mm is disposed in the hydraulic coupler unit between the coupler cylinder and the coupler volume.
  • the fuel film is in particular the coupler volume.
  • the fuel film is in particular between the top of the coupler piston and the bottom of the Coupling cylinder arranged.
  • the thickness of the fuel film is chosen as small as possible, so that the hydraulic coupler has the greatest possible rigidity.
  • the minimum thickness of the layer is determined by the required mounting tolerances and the changes in length between the piezoelectric actuator and the injector body with temperature change due to the different thermal expansion coefficients between the piezoelectric actuator and the material of the injector body, in particular steel.
  • the mating clearance - in particular the lateral mating clearance - between the coupler cylinder and the coupler piston is at most 10 ⁇ m, in particular at most 2 ⁇ m.
  • the piezo injector 1 according to FIG. 1 is formed in the embodiment shown for the direct injection of fuel into an internal combustion engine. It has a fuel inlet 2 and a fuel outlet 4. The fuel outlet 4 is closed by the nozzle needle 5 in the closed state of the piezo injector 1. For injection, the nozzle needle 5 opens to the outside and thus opens the fuel outlet. 4
  • the nozzle needle 5 is part of the nozzle unit 3 and is movable in a nozzle body 7 along a longitudinal axis of the piezo injector.
  • the transmission of the force from the actuator unit 9 to the nozzle needle 5 is effected by means of a hydraulic coupler unit 11.
  • the coupler unit 11 comprises the coupler piston 13, which is movably mounted in the coupler cylinder 15 along the longitudinal axis of the piezo injector 1.
  • the coupler piston 13 is pressed by means of the coupler spring 17 against a coupling piston 13 facing end face 23 of the nozzle needle 5.
  • the piezoelectric actuator unit 9 is discharged and the stack of piezoelectric ceramic discs shortens again to its original length.
  • the coupler cylinder 15 follows this movement.
  • the coupler volume isolated by the small seal gap can not increase so that the coupler piston 13 follows the movement of the coupler cylinder 15.
  • the nozzle needle 5 Since now no actuating force acts on the top of the nozzle needle 5, the nozzle needle 5 also follows the backward movement and gets back to its sealing seat.
  • the contact area between the coupler piston 13 and the nozzle needle 5 is in the right half of FIG. 1 shown in detail.
  • the coupler piston 13 has a contact surface 21 with the nozzle needle 5, which represents a portion of the bottom 28 and which is flat in the embodiment shown.
  • the end face 23 of the nozzle needle 5 is also flat.
  • a through hole 25 is inserted in the form of a through hole which penetrates the coupler piston 13 from an orifice on its bottom 28, where it makes contact with the nozzle needle 5, to an orifice at its top 26 and a flow connection for fuel from its bottom 28 to its top 26 provides.
  • the coupler volume is arranged in the form of a fuel film.
  • fuel can flow into the coupler volume and fill it up, whereby a pressure equalization between the coupler volume and the remaining fuel volume is ensured within the piezo injector.
  • the piezo injector for fuel injection opens to the outside by the nozzle needle 5 is actuated by the actuator unit 9.
  • the power transmission from the actuator 9 to the nozzle needle 5 by means of the hydraulic coupler unit 11 takes place.
  • the thin fuel layer with a thickness between 0.05 mm and 0.3 mm.
  • the force provided by the actuator unit 9 returns to zero.
  • the nozzle spring 19 pushes the nozzle needle 5 back up to its closed position. Since the coupler spring 17th is designed sufficiently weak, it comes to injection end to a gap between the coupler cylinder 15 and the coupler piston 13. The coupler piston 13 is lifted from the nozzle needle 5. The passage opening 25 is thereby released and fuel can flow from the fuel volume within the piezo injector 1 in the coupler volume between coupler cylinder 15 and coupler piston 13.
  • FIG. 2 shows a second embodiment of the piezo injector 1 according to FIG. 1 , This embodiment differs from that in FIG FIG. 1 shown first embodiment in that the end face 23 of the nozzle needle 5 is convex.
  • FIG. 3 schematically shows a piezo injector 1 according to a third embodiment of the invention.
  • This embodiment differs from that in the FIGS. 1 and 2 shown in that the end face 23 of the nozzle needle 5 is formed spherically convex and the contact surface 21 of the coupler piston 13 is conically concave. In this case, the radius of curvature of the end face 23 is smaller than that of the contact surface 21.
  • Both surfaces could also be spherical or conical. Via a variation of the contact diameter, the radial filling gap can be adjusted.
  • FIG. 4 shows a piezo injector 1 according to a fourth embodiment of the invention.
  • This embodiment differs from the embodiments shown in the previous figures in that the contact surface 21 of the coupler piston 13 is concave and the end face 23 of the nozzle needle 5 is flat.
  • the nozzle needle 5 touches the coupler piston 13 only in a circular area at its edge. In this embodiment, a relatively large radial flow area is available for pressure equalization.
  • FIG. 5 schematically shows a detail of a piezo injector 1 according to a fifth embodiment of the invention.
  • the contact surface 21 of the coupler piston 13 is formed flat, the end face 23 of the nozzle needle 5, however, convex, in the form of a projecting into the through hole 25 conical tip.
  • a centering of the nozzle needle 5 is achieved.
  • FIG. 6 shows details of a piezo injector 1 according to a sixth embodiment of the invention.
  • the contact surface 21 of the coupler piston 13 is formed flat, the end face 23 of the nozzle needle, however, concave, in the form of a hollow cone. It could also be spherical.
  • no centering of the nozzle needle 5 is achieved, but a relatively large radial flow area.
  • FIG. 7 shows a detail of a piezo injector 1 according to a seventh embodiment of the invention.
  • both the contact surface 21 of the coupler piston 13 and the end face 23 of the nozzle needle 5 formed flat.
  • a centering of the nozzle needle 5 is provided to the coupler piston 13, in the form of a recess 27 in the coupler piston 13, in which the nozzle needle 5 enters.
  • FIGS. 8 to 10 show details of piezoelectric injectors 1 according to an eighth, ninth and tenth embodiments of the invention, in which each of the contact surfaces 21 of the coupler piston 13 are concave, in the form of a hollow cone.
  • the end face 23 of the nozzle needle 5 is convex, in the form of a cone whose opening angle is exactly adapted to that of the hollow cone of the contact surface 21, so that there is a good centering.
  • the end face 23 is concave, in the form of a hollow cone.
  • it could also be spherical.
  • the end face 23 of the nozzle needle 5 is flat.
  • FIGS. 11 to 13 show details of piezoelectric injectors 1 according to an eleventh, twelfth and thirteenth embodiment of the invention, in which each of the contact surface 21 of the coupler piston 23 is formed convex, in the form of a cone.
  • the contact surfaces 21 could also be spherical.
  • the end face 23 of the nozzle needle 5 is convex, and spherical. It could also have a cone shape.
  • the end face 23 of the nozzle needle 5 is concave, in the form of a hollow cone. It could also be designed in the form of a hollow sphere.
  • the end face 23 of the nozzle needle is flat.
  • the individual embodiments thus differ only by the geometry of the contact surface 21 of the coupler piston 13 and the end face 23 of the nozzle needle 5.
  • the pressure compensation radial flow surfaces can be adapted to the requirements.
  • a centering and / or an angle compensation of the nozzle needle and the coupler piston to each other can be made possible as needed.

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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 (12)

  1. Injecteur piézoélectrique (1) pour l'injection de carburant, présentant
    - une unité de buse (3) avec un pointeau (5) disposé de façon mobile dans un corps de buse (7),
    - une unité d'actionneur piézoélectrique (9);
    - une unité de coupleur hydraulique (11) pour le couplage de l'unité de buse (3) à l'unité d'actionneur (9), qui présente un piston de coupleur (13), un cylindre de coupleur (15) et un ressort de coupleur (17), dans lequel le piston de coupleur (13) présente un côté supérieur (26) tourné vers le cylindre de coupleur (15) et un côté inférieur (28) tourné vers le pointeau (5), dans lequel le cylindre de coupleur (15) présente un fond sur le côté détourné du pointeau (5) et un volume de coupleur est formé entre le fond du cylindre de coupleur (15) et le côté supérieur (26) du piston de coupleur (13), dans lequel le piston de coupleur (13) est poussé par le ressort de coupleur (17) contre un côté frontal (23) du pointeau (5) tourné vers le côté inférieur (28) du piston de coupleur (13) et présente une face de contact (21) avec le pointeau (5),
    caractérisé en ce que le piston de coupleur (13) présente une ouverture de passage (25), qui procure une liaison d'écoulement de son côté inférieur (28) jusqu'à son côté supérieur (26) et qui est disposée à l'intérieur de la face de contact (21) avec le pointeau (5).
  2. Injecteur piézoélectrique (1) selon la revendication précédente, dans lequel l'ouverture de passage (25) s'étend à travers le piston de coupleur (13) depuis une embouchure dans le côté supérieur (26) jusqu'à une embouchure dans le côté inférieur (28) et l'embouchure de l'ouverture de passage (25) disposée dans le côté inférieur (28) peut être fermée au moyen du côté frontal (23) du pointeau (5).
  3. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel l'ouverture de passage (25) peut être rendue entièrement étanche par le pointeau (5).
  4. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel la face de contact (21) est réalisée sous forme plane.
  5. Injecteur piézoélectrique (1) selon l'une quelconque des revendications 1 à 3, dans lequel la face de contact (21) est réalisée sous forme concave ou convexe.
  6. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel le côté frontal (23) du pointeau (5) tourné vers le côté inférieur (28) du piston de coupleur est réalisé sous forme plane.
  7. Injecteur piézoélectrique (1) selon l'une quelconque des revendications 1 à 5, dans lequel le côté frontal (23) du pointeau (5) tourné vers le côté inférieur (28) du piston de coupleur est réalisé sous forme convexe ou concave.
  8. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel le côté frontal (23) et/ou la face de contact (21) est réalisé(e) sous forme sphérique.
  9. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel le côté frontal (23) et/ou la face de contact (21) est réalisé(e) sous forme conique.
  10. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel le pointeau (5) est réalisé sous forme s'ouvrant vers l'extérieur.
  11. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel un film de carburant d'une épaisseur comprise dans la plage de 0,01 mm à 0,7 mm est disposé entre le cylindre de coupleur (15) et le piston de coupleur (13) pour la transmission de force.
  12. Injecteur piézoélectrique (1) selon l'une quelconque des revendications précédentes, dans lequel un jeu de couplage latéral entre le cylindre de coupleur (15) et le piston de coupleur (13) vaut au maximum 10 µm.
EP16779084.9A 2015-10-14 2016-10-10 Injecteur piézoélectrique pour l'injection de carburant Active EP3362671B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015219912.6A DE102015219912B3 (de) 2015-10-14 2015-10-14 Piezo-Injektor zur Kraftstoffeinspritzung
PCT/EP2016/074182 WO2017063988A1 (fr) 2015-10-14 2016-10-10 Injecteur piézoélectrique pour l'injection de carburant

Publications (3)

Publication Number Publication Date
EP3362671A1 EP3362671A1 (fr) 2018-08-22
EP3362671B1 true EP3362671B1 (fr) 2019-07-17
EP3362671B8 EP3362671B8 (fr) 2019-12-18

Family

ID=57124009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16779084.9A Active EP3362671B8 (fr) 2015-10-14 2016-10-10 Injecteur piézoélectrique pour l'injection de carburant

Country Status (6)

Country Link
US (1) US20180298861A1 (fr)
EP (1) EP3362671B8 (fr)
KR (1) KR102082589B1 (fr)
CN (1) CN108138716A (fr)
DE (1) DE102015219912B3 (fr)
WO (1) WO2017063988A1 (fr)

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Publication number Priority date Publication date Assignee Title
KR101940563B1 (ko) * 2017-05-12 2019-01-22 주식회사 로보프린트 이미지 가공 방법, 이미지 자동 인쇄 방법 및 자동인쇄장치용 노즐

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KR20180063894A (ko) 2018-06-12
US20180298861A1 (en) 2018-10-18
WO2017063988A1 (fr) 2017-04-20
DE102015219912B3 (de) 2017-04-06
CN108138716A (zh) 2018-06-08
KR102082589B1 (ko) 2020-02-27
EP3362671A1 (fr) 2018-08-22
EP3362671B8 (fr) 2019-12-18

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