EP3234341B1 - Injecteur de carburant pour moteur à combustion interne - Google Patents

Injecteur de carburant pour moteur à combustion interne Download PDF

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Publication number
EP3234341B1
EP3234341B1 EP14824862.8A EP14824862A EP3234341B1 EP 3234341 B1 EP3234341 B1 EP 3234341B1 EP 14824862 A EP14824862 A EP 14824862A EP 3234341 B1 EP3234341 B1 EP 3234341B1
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EP
European Patent Office
Prior art keywords
fuel
injector
space
needle arrangement
control piston
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EP14824862.8A
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German (de)
English (en)
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EP3234341A1 (fr
Inventor
Antti VUOHIJOKI
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Wartsila Finland Oy
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Wartsila Finland Oy
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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
    • 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
    • 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
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. 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
    • 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

Definitions

  • the present invention relates to a fuel injector for an internal combustion piston engine according to the preamble of claim 1. More particularly, the invention relates to a fuel injector for an internal combustion piston engine comprising an injector body provided with a fuel space in the body, a fuel inlet for admission of pressurized fuel into the fuel space, at least one nozzle orifice through which fuel may be injected into a cylinder of the engine, an injector needle arrangement, a first end of which is arranged in co-operation with the nozzle orifice for opening or closing the orifice, a spring element forcing the injector needle towards a position closing the nozzle orifice, and a piezoelectric actuator arranged to control the position of the injector needle arrangement so as to control opening and closing of a flow communication from the fuel space through the at least one nozzle orifice.
  • the fuel is injected as a fine mist from the fuel injector into the cylinder of the engine such that with eddies of air is achieved a good mixture of fuel and combustion air and combustion.
  • Fuel injected by the fuel injector as tiny droplets vaporizes quickly as combustion begins after a short ignition delay.
  • a spring-loaded injector needle is typically used as a shut-off element in the fuel injector. The injector needle is generally guided hydraulically by the pressure of the fuel or other hydraulic fluid.
  • One means of achieving these goals is to adjust with a greater accuracy the amount of the fuel injection and the timing and duration of injection during the injection event.
  • the accuracy of adjustment of fuel injection can be improved by guiding the injector needle of the fuel injector by a piezoelectric actuator.
  • WO 2013160536 A1 is related to a fuel injector for a reciprocating engine.
  • the fuel injector comprises an injector needle for opening and closing a flow communication between a fuel chamber and a nozzle opening, and a movable control piston, a fuel space delimited by the control piston and the injector needle, whereby fuel pressure in the fuel space is arranged to press the injector needle towards a closing position.
  • EP 1342913 A1 discloses a fuel injector comprising a body with an injection orifice at the end of the body to deliver fuel, a moving needle so as to opening and closing a flow path via the injection orifice, a piezoelectric actuator, and a return spring. Movement amplification between the actuator and the needle is provided with a hydraulic chamber with one end closed by the moving surface of the actuator and the other end closed by a surface attached to the needle. The needle is allowed to move a distance which is greater than a movement of the actuator.
  • JP 2010223195 A is related to a fuel injection in an internal combustion engine comprising a piezoelectric actuator.
  • the reliability of the piezoelectric actuator is enhanced while improving energy efficiency in a direct-acting type fuel injection valve having a variable displacement magnification which is opened when the piezoelectric actuator is charged.
  • US 2008/0163852 A1 discloses an injector for fuel injection systems of internal combustion engines, in particular, direct-injecting diesel engines.
  • the injector comprises a piezoelectric actuator contained in an injector body and acted in by a first spring mechanism so that it remains in contact with the injector body at one end and with a sleeve-like booster piston on the other end.
  • FR 2 941 745 A3 discloses an injecting device having an electro-active material actuator arranged to trigger movement of a needle.
  • the injecting device comprises a hydraulic chamber defined by an actuator piston and a needle piston.
  • the hydraulic chamber is connected to a duct for maintaining the hydraulic chamber supplied with liquid.
  • An object of the invention is to provide a fuel injector for an internal combustion piston engine in which the performance is considerably improved compared to the prior art solutions.
  • a fuel injector for an internal combustion piston engine comprising an injector body provided with a fuel space in the body, a fuel inlet for admission of pressurized fuel into the fuel space, at least one nozzle orifice through which fuel may be injected into a cylinder of the engine, an injector needle arrangement, a first end of which is arranged in co-operation with the nozzle orifice for opening or closing the orifice, a spring element forcing the injector needle towards a position closing the nozzle orifice, and a piezoelectric actuator arranged to control the position of the injector needle arrangement so as to control opening and closing of a flow communication from the fuel space through the at least one nozzle orifice.
  • the piezoelectric actuator is in direct connection with a control piston at a first end of the control piston, a second end of which control piston is arranged to extend into a cylinder space arranged into the injector body, the control piston having a first cross sectional area at its second end, a second end of the injector needle arrangement is arranged to extend from the fuel space into the cylinder space towards the control piston, the second end of the injector needle arrangement having a second cross sectional area, being smaller than the first cross sectional area, the cylinder space is arranged in flow connection with the fuel space via a gap between the second end of the injector needle arrangement extending into the cylinder space and the injector body so that the cylinder space is filled with the fuel, and the injector body is provided with a fuel discharge duct which opens into the cylinder space and the fuel space is continuously in flow communication with the discharge duct for discharging fuel from the fuel space via a flow path successively comprising the gap between the second end of the injector needle arrangement and the injector body,
  • This provides a fuel injector for an internal combustion piston engine which performance is considerably improved.
  • the fuel injector is accurate, fast and easy to control.
  • This type of fuel injector is a so-called direct acting.
  • a minor amount of fuel may leak through the gap into the cylinder space from the fuel space and further discharges from the fuel injector via the discharge duct. This keeps the gap clean.
  • the discharge duct is in flow communication to a low pressure fuel system, for example, a fuel return duct and a tank. This will prevent additional leakages in the fuel injector and enhances the durability of the fuel injector.
  • the invention provides a very fast injector wherein a small movement of the piezoelectric actuator is transferred to a larger movement of the injector needle arrangement. This is due to the cylinder space which amplifies the movement of the injector needle arrangement.
  • the fuel is moving via the gaps and thus substantially continuously changing in the fuel space, it keeps clean moving parts of the injector needle arrangement. This is desirable, at least with fuels which are poor in properties i.e. problematic or which are not substantially clean partially because the fuel may not be stuck in the fuel injector. There is no need for additional control oil systems for operating the fuel injector.
  • the flow communication from the fuel space through the at least one nozzle orifice into the cylinder of the engine is openable by activating the piezoelectric actuator causing a retraction movement of the control piston from the cylinder space and thus moving the injector needle arrangement away from the nozzle orifice, wherein the movement of the injector needle arrangement is proportional to the ratio of the first cross sectional area of the control piston and the second cross sectional area of the injector needle arrangement.
  • the piezoelectric actuator comprises a stack of piezoelectric elements isolated from contact with fuel in the injector body when in use. This protects the piezoelectric actuator from the fuel. In other words, the fuel space is not in flow communication with the piezoelectric actuator.
  • the piezoelectric actuator is isolated from the discharge duct in addition to the fuel inlet.
  • the first end of the control piston is attached to the piezoelectric element of the piezoelectric actuator.
  • the spring element is arranged in a spring chamber that is in flow communication with the fuel inlet and the fuel space.
  • the flow communication from the fuel space via the at least one nozzle orifice is arranged to be open, at least a portion of the second end of the injector needle arrangement extends into the cylinder space.
  • a surface of the second end of the control piston is in contact with a surface of the second end of the injector needle arrangement.
  • Figure 1 depicts schematically a fuel injector 10 for an internal combustion piston engine comprising an injector body 12 provided with a fuel space 14 in the body 12.
  • the fuel space 14 is in connection with a fuel inlet 16 in the body 12 and receives pressurized fuel via the fuel inlet 16 from e.g. a pressure accumulator (not shown).
  • the fuel injector 10 is provided with at least one nozzle orifice 18 at and end of the body 12 through which fuel may be injected into a cylinder of the engine.
  • Fig. 1 there are schematically shown two nozzle orifices 18. In practice, however, the number of nozzle orifices may vary.
  • the fuel injector 10 further comprises an injector needle arrangement 22 which is provided with a first end 21 which is arranged in co-operation with the nozzle orifice 18 in the body 12 for opening or closing the orifice 18 depending on the position of the injector needle arrangement 22.
  • the fuel injector 10 comprises a spring element 24 forcing the needle arrangement 22 towards a position closing the nozzle orifice 18, that is when the needle tip is against end of the nozzle.
  • the spring element 24 is a helical spring.
  • Fig. 1 illustrates schematically a situation when the flow communication is closed from the fuel space 14 via the nozzle orifice(s) 18.
  • the spring element 24 is arranged into a spring chamber 25 and surrounding a portion of the injector needle arrangement 22.
  • the spring chamber 25 is in direct flow communication with the fuel inlet 16 and with the fuel space 14. There is a clearance between the injector needle arrangement 22 and the injector body via which the spring chamber 25 is in flow communication with the fuel space 14.
  • fuel pressure in the fuel space 14 is arranged to subject a force component in the direction of a longitudinal axis A of the fuel injector 10 to the injector needle arrangement 22. The actual position and movement of the needle arrangement is ruled by co-operation of the spring element and the forces subjected by the fuel pressure to the needle.
  • piezoelectric actuator 26 arranged to the fuel injection to control the position of the injector needle arrangement 22 so as to control opening and closing of a flow communication from the fuel space 14 through the at least one nozzle orifice 18 into the cylinder 20 of the engine, when being installed into the engine.
  • control piston arranged in connection with the piezoelectric actuator 26, which is in direct connection with the control piston 28, more specifically with a first end 29 of the control piston.
  • a second end 27 of the control piston 28 is arranged to extend into a cylinder space 30 arranged into the injector body 12.
  • the piezoelectric actuator 26 is supported into the body so that it may apply force to the control piston 28, for example by arranging the end opposite to the control piston to be supported by the body.
  • the control piston 28 has a first cross sectional area A1 specifically at the second end 27 thereof.
  • the control piston 28 has a first diameter D1 specifically at the second end 27 thereof which second end 27 is substantially cylinder.
  • the form of the second end 27 of the control piston 28 is not limited only to cylinder. Thus any other shape is possible for the second end 27 of the control piston 28, for instance, a rectangular prism.
  • the control piston 28 as well as the piezoelectric actuator 26 is movable in a direction of the longitudinal axis A of the fuel injector 10.
  • the injector needle arrangement 22 is movable in the direction of the longitudinal axis A of the fuel injector 10.
  • the piezoelectric actuator 26 and the injector needle arrangement 22 work in co-operation but according to the invention the movement of the injector needle arrangement 22 can even be up to five times greater than the movement of the control piston 28 which is moved by the piezoelectric actuator 26..
  • a second end 23 of the injector needle arrangement 22 is arranged to extend from the fuel space 14 into the cylinder space 30 towards the control piston 28.
  • the second end 23 of the injector needle arrangement 22 has a second cross sectional area A2 that is smaller than the first cross sectional area A1.
  • a form of the second end 23 of the injector needle arrangement 22 is cylindrical having a second diameter D2 that is smaller than the first diameter D1 of the control piston 28.
  • a surface 27' of the second end 27 of the control piston 28 is substantially of greater cross sectional area than a surface 23' of the second end 23 of the injector needle arrangement 22.
  • the control piston 28 is arranged between the piezoelectric actuator 26 and the injector needle arrangement 22.
  • the shape of the second end 23 of the injector needle arrangement 22 is not limited only to cylindrical shapes. Thus any other shape is possible for the second end 23 of the injector needle, for instance, a rectangular prism.
  • the cylinder space 30 is arranged in flow connection with the fuel space 14 via a gap 32 between the second end 23 of the injector needle arrangement 22 extending into the cylinder space 30 and the injector body 12 so that the cylinder space 30 is filled with the fuel when in use.
  • the cylinder space 30 may be called as a hydraulic volume because it amplifies a relatively small movement of the piezoelectric actuator 26, and this way also the movement of the control piston, to a larger movement of the injector needle arrangement 22.
  • ⁇ V ( ⁇ D1 2 /4). x.
  • z ⁇ V /( ⁇ D2 2 /4).
  • the movement of the injector needle arrangement 22 is proportional to the ratio of the first cross sectional area A1 of the control piston 28 and the second cross sectional area A2 of the injector needle arrangement 22.
  • the movement of the injector needle arrangement 22 is proportional to a square of the ratio of the first diameter D1 of the control piston 28 and the second diameter D2 of the injector needle arrangement 22.
  • the injector body is provided with the fuel discharge duct 34 which opens into the cylinder space 30.
  • the fuel space 14 is continuously in flow communication with the discharge duct 34 for discharging fuel from the fuel space 14 via a flow path comprising the gap 32 between the second end 23 of the injector needle arrangement 22 and the injector body 12, the cylinder space 30, a gap 36 between the second end 27 of the control piston 28 and the injector body 12, and the discharge duct 34.
  • the fuel is changing in the fuel injector 10 and the fuel injector 10 is kept clean by the fuel.
  • the fuel introduced into the fuel space 14 at least a portion of fuel is substantially continuously discharged via the discharge duct 34, also, when the flow communication from the fuel space 14 into the cylinder 20 of the engine is closed.
  • the discharge duct 34 is in flow communication to a low pressure fuel system, for example a fuel return duct and a tank, which are not shown in figures.
  • a low pressure fuel system for example a fuel return duct and a tank, which are not shown in figures.
  • the discharge duct 34 opens into the cylinder space 30 at a longitudinal location nearer to the first end 29 of the control piston 28 than the second end 27 of the control piston which improves the cleaning effect described above,
  • the flow communication from the fuel space 14 through the at least one nozzle orifice 18 into the cylinder 20 of the engine is openable by activating the piezoelectric actuator 26 causing a retraction movement of the control piston 28 from the cylinder space 30 and thus moving the injector needle arrangement 22 away from the nozzle orifice 18, wherein according to an embodiment of the invention, the movement of the injector needle arrangement 22 is proportional to the ratio of the first cross sectional area A1 of the control piston 28 and the second cross sectional area A2 of the injector needle arrangement 22. According to an embodiment of the invention, the movement of the injector needle arrangement 22 is proportional to a square of the ratio of the first diameter D1 of the control piston 28 and the second diameter D2 of the injector needle arrangement 22.
  • the piezoelectric actuator 26 and the injector needle arrangement 22 work in co-operation but the movement of the injector needle arrangement 22 is larger than the movement of the piezoelectric actuator 26.
  • the function of the piezoelectric actuator 26 is based on the piezoelectric phenomenon.
  • the piezoelectric actuator 26 comprises piezoelectric elements 26' which comprise piezoelectric crystals made generally from PZT ceramics.
  • the PZT ceramics comprise lead, zirconium and titanium.
  • the piezoelectric elements 26' are arranged one above another so as to form a so-called a piezoelectric stack.
  • Figure 1 illustrates the piezoelectric actuator 26 that comprises the stack of piezoelectric elements isolated from contact with fuel in the injector body 12 when in use. In other words, the fuel is not allowed to flow into the piezoelectric actuator 26 from the fuel space 14.
  • the piezoelectric actuator 26 is isolated from the discharge duct 34 and the fuel inlet 16. This protects the piezoelectric actuator 26 and the piezoelectric elements 26' from the fuel.
  • the fuel space 14 is not in flow communication with the piezoelectric actuator 26.
  • the first end 29 of the control piston 28 is attached to the piezoelectric element 26' of the piezoelectric actuator 26.
  • a length of the piezoelectric actuator 26 changes in response to an electrical field.
  • the piezoelectric actuator 26 is energized.
  • the piezoelectric actuator 26 is compressed or exposed to retraction that is the length of the piezoelectric elements 26' is shortened.
  • the needle arrangement 22 is moving away from the closing position and the at least one nozzle orifice 18 towards the control piston 28 so as to open the flow communication from the fuel space 14 into the cylinder 20 of the engine.
  • Figure 2 illustrates schematically a position when the flow communication from the fuel space 14 is open into the cylinder 20 of the engine via the nozzle orifice 18.
  • a hydraulic pressure due to the fuel flowing into the fuel space 14 and the cylinder space 30 forces the needle arrangement 22 into the position wherein the flow communication from the fuel space 14 to the cylinder 20 of the engine is open.
  • the cylinder space 30 amplifies the movement of the injector needle arrangement 22 towards the control piston 28.
  • FIG. 2 it is illustrated that the second end 23 of the injector needle arrangement 22 is not in contact with the second end 27 of the control piston 28 in the cylinder space 30.
  • a small retraction movement of the piezoelectric actuator 26 is transferred to a greater opening movement of the injector needle arrangement 22.
  • a movement of the piezoelectric actuator 26 can be e.g. five times smaller than a movement of the injector needle arrangement 22.
  • at least a portion of the second end 23 of the injector needle arrangement 22 extends into the cylinder space 30 when the flow communication from the fuel space 14 is open into the cylinder 20 of the engine via the at least one nozzle orifice 18.
  • the surface 23' of the second end 23 of the injector needle arrangement 22 is not in contact with the surface 27' of the second end 27 of the control piston 28.
  • the fuel injector needle arrangement 22 When to the piezoelectric actuator 26 is de-energized, the fuel injector needle arrangement 22 is in a closing position and thus the flow communication from the fuel space 14 to the cylinder 20 of the engine is closed as illustrated in Figure 1 .
  • the movement of the injector needle arrangement 22 is very fast due to the fact that the cylinder space 30 is filled with the fuel and amplifies the movement of the injector needle arrangement 22 towards the at least one nozzle orifices 18, in Fig. 1 towards the two nozzle orifices 18.
  • the piezoelectric actuator 26 when the piezoelectric actuator 26 is de-energized, the length of the piezoelectric actuator grows and the movement of the piezoelectric actuator is towards the injector needle arrangement 22 when expanding. This forces the injector needle arrangement 22 to its closing position.
  • Figure 1 and Figure 2 illustrate an embodiment of the fuel injector 10 having only one control piston 28, according to an embodiment of the invention, it is possible to have more than one control piston element 28 in the fuel injector 10.

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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 (7)

  1. Injecteur de carburant (10) pour moteur à piston à combustion interne, comprenant
    - un corps d'injection (12) pourvu d'un espace de carburant (14) dans le corps (12),
    - une entrée de carburant (16) pour l'admission de carburant pressurisé dans l'espace de carburant (14),
    - au moins un orifice de buse (18) à travers lequel du carburant peut être injecté dans un cylindre (20) du moteur,
    - un dispositif d'aiguille d'injection (22) dont une première extrémité (21) est disposée en coopération avec l'orifice de buse (18) pour ouvrir ou fermer l'orifice (18),
    - un élément à ressort (24) poussant le dispositif d'aiguille d'injection (22) vers une position fermant l'orifice de buse (18), et
    - un actionneur piézo-électrique (26) conçu pour contrôler la position du dispositif d'aiguille d'injection (22) de manière à contrôler l'ouverture d'une communication d'écoulement depuis l'espace de carburant (14) à travers l'au moins un orifice de buse (18) par un mouvement de rétraction,
    - l'actionneur piézo-électrique (26) étant en connexion directe avec un piston de commande (28) à une première extrémité (29) du piston de commande (28), une seconde extrémité (27) duquel piston de commande (28) étant conçue pour s'étendre dans un espace cylindrique (30) disposé dans le corps d'injection (12), et la seconde extrémité du piston de commande (28) ayant une première superficie de section transversale (A1),
    - une seconde extrémité (23) du dispositif d'aiguille d'injection (22) étant conçue pour s'étendre depuis l'espace de carburant (14) dans l'espace cylindrique (30) en direction du piston de commande (28), la seconde extrémité (23) du dispositif d'aiguille d'injection (22) ayant une seconde superficie de section transversale (A2) qui est inférieure à la première superficie de section transversale (A1) du piston de commande (28),
    - le corps d'injection (12) étant pourvu d'une conduite de décharge de carburant (24) qui s'ouvre sur l'espace cylindrique (30), et
    caractérisé en ce que
    - l'espace cylindrique (30) est disposé en connexion d'écoulement avec l'espace de carburant (14) via un intervalle entre la seconde extrémité (23) du dispositif d'aiguille d'injection (22) s'étendant dans l'espace cylindrique (30) et le corps d'injection (12), de sorte que l'espace cylindrique (30) est rempli de carburant, et
    - l'espace de carburant (14) est continûment en communication d'écoulement avec la conduite de décharge (34) pour décharger du carburant depuis l'espace de carburant (14) via un parcours d'écoulement comprenant successivement l'intervalle (32) entre la seconde extrémité (23) du dispositif d'aiguille d'injection (22) et le corps d'injection (12), l'espace cylindrique (30), un intervalle (36) entre la seconde extrémité (27) du piston de commande (28) et le corps d'injection (12), et la conduite de décharge (34).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la communication d'écoulement depuis l'espace de carburant (14) à travers l'au moins un orifice de buse (18) vers l'intérieur du cylindre (20) du moteur peut être ouverte en activant l'actionneur piézo-électrique (26) provoquant un mouvement de rétraction du piston de commande (28) depuis l'espace cylindrique (30) et éloignant ainsi le dispositif d'aiguille d'injection (22) de l'orifice de buses (18), le mouvement du dispositif d'aiguille d'injection (22) étant proportionnel au rapport entre la première superficie de section transversale (A1) du piston de commande et la seconde superficie de section transversale (A2) du dispositif d'aiguille d'injection (22) .
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'actionneur piézo-électrique (26) comprend une pile d'éléments piézo-électriques (26') isolés du contact avec le carburant dans le corps d'injection (12) en cours d'utilisation.
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que la première extrémité (29) du piston de commande (28) est fixée à l'élément piézo-électrique (26') de l'actionneur piézo-électrique (26).
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'élément à ressort (24) est disposé dans une chambre de ressort (25) qui est en communication d'écoulement avec l'entrée de carburant (16) et l'espace de carburant (14) .
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, lorsque la communication d'écoulement depuis l'espace de carburant (14) via l'au moins un orifice de buse (18) est prévue pour être ouverte, au moins une partie de la seconde extrémité (23) du dispositif d'aiguille d'injection (22) s'étend dans l'espace cylindrique (30).
  7. Injecteur de carburant selon l'une quelconque des revendications 1 à 6, caractérisé en ce que, lorsque la communication d'écoulement depuis l'espace de carburant (14) via l'au moins un orifice de buse (18) est prévue pour être ouverte, une surface (27') de la seconde extrémité (27) du piston de commande (28) est en contact avec une surface (23') de la seconde extrémité (23) du dispositif d'aiguille d'injection (22).
EP14824862.8A 2014-12-19 2014-12-19 Injecteur de carburant pour moteur à combustion interne Active EP3234341B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2014/051031 WO2016097463A1 (fr) 2014-12-19 2014-12-19 Injecteur de carburant pour moteur à combustion interne

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EP3234341A1 EP3234341A1 (fr) 2017-10-25
EP3234341B1 true EP3234341B1 (fr) 2019-02-06

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SE545024C2 (en) * 2019-10-01 2023-02-28 Scania Cv Ab Fuel injector arrangement for an internal combustion engine and method for operating said arrangement

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FR2836518B1 (fr) 2002-02-22 2005-12-02 Peugeot Citroen Automobiles Sa Injecteur de carburant
DE10217594A1 (de) * 2002-04-19 2003-11-06 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10302863B3 (de) * 2003-01-25 2004-09-16 Robert Bosch Gmbh Hydraulischer Koppler für Piezo-Injektoren mit verbesserter Befüllung
DE10336327B4 (de) 2003-08-07 2016-03-17 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
FR2941745A3 (fr) * 2009-02-02 2010-08-06 Renault Sas Dispositif d'injection de liquide, notamment de carburant.
JP5024320B2 (ja) 2009-03-25 2012-09-12 株式会社デンソー 燃料噴射弁
FI123570B (en) 2012-04-24 2013-07-15 Waertsilae Finland Oy fuel injector

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WO2016097463A1 (fr) 2016-06-23

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