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EP2980395A1 - Soupape d'injection de carburant pour moteurs à combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP2980395A1
EP2980395A1 EP14179027.9A EP14179027A EP2980395A1 EP 2980395 A1 EP2980395 A1 EP 2980395A1 EP 14179027 A EP14179027 A EP 14179027A EP 2980395 A1 EP2980395 A1 EP 2980395A1
Authority
EP
European Patent Office
Prior art keywords
armature
valve needle
fuel injection
stopper element
needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14179027.9A
Other languages
German (de)
English (en)
Inventor
Marco Maragliulo
Francesco Sabatini
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.)
Continental Automotive 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
Priority to EP14179027.9A priority Critical patent/EP2980395A1/fr
Publication of EP2980395A1 publication Critical patent/EP2980395A1/fr
Withdrawn legal-status Critical Current

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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
    • F02M51/061—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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the disclosure relates to a fuel injection valve for an internal combustion engine.
  • Fuel injection valves which operate electromagnetically are well known. With the aid of an electromagnetic actuator having a magnetic coil which is chargeable by electricity to generate a magnetic field, a magnetizable armature which may be combined with a valve needle, will be stimulated for movement. Normally, the movement is an axial movement along a valve axis of the valve.
  • valve needle If the valve needle and the armature are coupled, the valve needle also starts moving due to the movement of the armature.
  • a nozzle orifice may be opened or closed with the aid of the valve needle.
  • a valve spring is normally positioned in the fuel injection valve, which urges the valve needle against the nozzle orifice. This means, that the valve needle has to be moved by the aid of the armature against the spring force of the valve spring, when the nozzle orifice is to be opened.
  • a fuel quantity positioned in the fuel injection valve can flow through the nozzle orifice into a combustion chamber, normally a combustion chamber of an internal combustion engine.
  • a problem of fuel injection valves in the state of the art is a so-called overshoot of the valve needle.
  • the valve needle is detachably coupled with the armature. Due to an impact of the armature with the stop element, the valve needle and the armature decouple and the valve needle may move without being contacted to the armature. So an extraordinary lift is initiated, also called needle overshoot. More fuel as expected may be sprayed into the combustion engine due to the needle overshoot.
  • a combustion process of the internal combustion engine depends among several other criteria, e.g. fuel quantity or fuel temperature or fuel pressure, on the opening and closing of the nozzle orifice. Therefore, an exactly defined opening and closing of the nozzle orifice are very important for reaching a desired power rate, fuel consumption or emissions of the internal combustion engine.
  • the international application WO 2013/060717 A1 discloses a fuel injection valve for an internal combustion engine which comprises a valve body with a cavity and a valve needle being movably arranged in the cavity.
  • a movable armature is positioned in the cavity and may axially move along a central longitudinal axis of the valve body. The moving is initiated by an electromagnetic actuator due to a magnetic field.
  • the valve needle comprises a stop element fixed to the valve needle for coupling a movable armature with the valve needle.
  • the stop element is arranged between an armature body of the armature and a flange of the armature.
  • an armature spring is provided between the armature body and the stopper.
  • a fuel injection valve for an internal combustion engine comprises a housing having a central longitudinal valve axis and a cavity with a fluid inlet portion and a fluid outlet portion. It further comprises a valve needle which is axially movable in the cavity.
  • the valve needle is operable to prevent fuel flow through the fluid outlet portion in a closing position of the valve needle and to allow fuel flow through the fluid outlet portion in opening positions of the valve needle.
  • it is operable to prevent fuel flow through at least one injection nozzle of the fuel injection valve in the closing position and to allow fuel flow through the at least one injection nozzle in the opening positions.
  • the housing comprises the injection nozzle(s).
  • a needle tip of the valve needle forms the - in particular only - injection nozzle together with the fluid outlet portion.
  • the fuel injection valve comprises a valve spring which is operable to bias the valve needle towards the closing position.
  • the fuel injection valve comprises an electromagnetic actuator with a magnetic coil, an armature and a pole element.
  • the armature positioned in the cavity. It is axially movable relative to the housing and to the valve needle.
  • the armature has a recess.
  • the valve needle comprises a stopper element.
  • the stopper element is positioned in the recess of the armature.
  • the stopper element is disc-shaped or comprises a disc-shaped portion.
  • the stopper element preferably extends circumferentially around a shaft of the valve needle. It may be fixed to the shaft or in one piece with the shaft.
  • the valve needle has a seat element at its axial end facing towards the fluid outlet portion and a spring seat at the opposite axial end.
  • the valve spring may expediently bears on the spring seat.
  • the stopper element is arranged at an axial position between the seat element and the spring seat and axially spaced apart from the seat element and the spring seat.
  • the stopper element and the recess are configured such that a movement of the valve needle can be actuated by the electromagnetic actuator. More specifically, the stopper element and the recess are configured such that the stopper element is operable to engage into a form-fit connection with the armature for initiating a movement of the valve needle and to engage in a further form-fit connection with the armature for limiting a movement of the valve needle relative to the armature.
  • the armature extends around the stopper in such fashion that an axial movement of the armature towards the pole element is transferable to the valve needle by the form-fit connection with the stopper element and an axial displacement of the valve needle relative to the armature in axial direction away from the closing position is limited by the further form-fit connection.
  • the dynamics of the movement of the valve needle may be improved.
  • the armature may be used for initiating the movement of the valve needle on the one hand.
  • the armature may be used for limiting the movement of the valve needle relative to the armature so that the overshoot may be reduced only by embedding the stopper element in the armature.
  • the armature has a first armature body and a second armature body wherein the first armature body and the second armature body are fixed to each other and are shaped to form the recess between the first armature body and the second armature body.
  • the armature bodies are fixedly coupled, for example by welding.
  • the recess in which the stopper element is received is provided in one of the first and second armature bodies. This enables an easy way of manufacturing the embedded stopper element in the armature.
  • the recess is manufactured by milling in one of the armature bodies.
  • the recess has to be manufactured on a side of the armature body which faces the other armature body so that the recess may be closed by the other armature body.
  • the stopper element may solely move between the first armature body and the second armature body in the recess. So the possible needle overshoot may be particularly small. Also, due to the possibility of a precise dimensioning of the recess, the stopper element may axially move without getting stuck.
  • the form-fit connection for initiating the movement of the valve needle is established between a second surface of the armature facing towards the pole element and a fourth surface of the stopper element facing away from the pole element
  • the further form-fit connection for limiting the movement of the valve needle relative to the armature is established between a first surface of the armature facing away from the pole element and a third surface of the stopper element facing towards the pole element.
  • the second surface and the fourth surface are planar.
  • the advantage of such planar surfaces which contact each other for moving the valve needle is that a contact area of the surfaces may be enhanced. Therefore a pressure resulting from a weight of the valve needle may be distributed over the enhanced contact area and causes less wear.
  • the contact area of the second and fourth surfaces is at least 25 %, preferable at least 50 % of the area content enclosed by an outer contour of the stopper element in top view along the longitudinal axis. In this way, a satisfactory hydraulic damping of the movement of the valve needle relative to the armature is achievable when the displacement of the latter stops - e.g. in contact with the pole element - and the form-fit connection is released. A particularly good dynamic behaviour of the valve needle is achievable in this way. In particular, the impact of the valve needle on the armature when engaging into the further form-fit connection may be particularly soft.
  • the first surface and the third surface are planar. Therefore a pressure between the armature and the stopper element is reduced due to the enhanced contact area between the stopper and the armature during the closing phase of the injection process.
  • the contact area of the first and third surfaces is at least 25 %, preferable at least 50 % of the area content enclosed by the outer contour of the stopper element in top view along the longitudinal axis.
  • the form-fit connection for initiating the movement of the valve needle is established between a contact surface of the armature facing towards the pole element and a contact surface of the stopper element facing away from the pole element.
  • Said contact surfaces are in particular the above-mentioned second and fourth surfaces.
  • the contact area of the contact surfaces has a surface roughness R a which is equal to or less than 1.2 ⁇ m. Because of this surface roughness the hydraulic sticking between the contact surfaces may be particularly large.
  • the stop element is in particular the pole element or a further part of the fuel injection valve which is positionally fix with respect to the pole element. Due to the hit of the armature against the stop element, the valve needle, resp. the stopper element and the armature may decouple so that the valve needle travels between the first surface and the second surface. Due to the sticking between the contact surfaces, the travel may be reduced and/or delayed and/or damped or the stopper element will not decouple of the armature so the overshoot at all.
  • an increased adhesion area - in particular on a microscopic scale - is achieved by reducing the surface roughness. Due to the increased adhesion area, the overshoot may be particularly small or even avoided.
  • the stopper element comprises or consists of a magnetizable material, preferably a ferromagnetic material, which is in particular not a permanent magnetic material.
  • a magnetizable material preferably a ferromagnetic material
  • the magnetization of the magnetic stopper element and the magnetic armature causes an attractive magnetic force between the stopper element and the armature which reinforces the form-fit connection or the further form-fit connection, respectively, between the stopper element and the armature.
  • the connection can only be released against said attractive magnetic force which leads to a damping of the needle movement relative to the armature or to a complete avoidance of the overshoot.
  • the stopper element is made out of a magnetic steel.
  • the stopper element comprises or consists of stainless steel having the steel grade AISI 440C.
  • FIG. 1 shows an exemplary embodiment of a fuel injection valve 1 according to the invention.
  • the fuel injection valve 1 may be used as a fuel injection valve for an internal combustion engine, in particular for dosing fuel directly into a combustion chamber of the engine.
  • the fuel injection valve 1 according to the present embodiment is of the inward opening type.
  • the injection valve 1 may be of the outward opening type.
  • the fuel injection valve 1 comprises a housing 2 having a longitudinal valve axis 6.
  • the housing 2 has a cavity 8 which hydraulically connects a fluid inlet portion 10 to a fluid outlet portion 12 of the fuel injection valve 1.
  • a valve needle 4 is movably arranged in the cavity 8 of the housing 2.
  • the cavity 8 extends axially trough the housing 2 from the fluid inlet portion 10 to the fluid outlet portion 12.
  • the fluid inlet portion 10 is configured for hydraulically coupling the fuel injection valve 1 to a fuel rail in which the fuel is stored under high pressure.
  • a sealing element 48 is provided in the area of the fluid inlet portion 10, the sealing element 48 embracing the housing 2.
  • the fuel injection valve 1 has an injection nozzle, in the following also denoted as nozzle orifice 13. Fuel coming from the fuel rail into the fluid inlet portion 10 may flow through the cavity 8 and leave the fuel injection valve 1 through the nozzle orifice 13 at the fuel outlet portion 12. A flow of the fluid through the fuel injection valve 1 is indicated by a dotted line in Fig. 1 .
  • the nozzle orifice 13 may be opened and closed by the valve needle 4.
  • the valve needle 4 has a generally cylindrical shape and is not hollow.
  • the valve needle 4 is axially displaceable relative to the housing 2 for closing and opening the nozzle orifice 13 of the housing 2 by means of its needle tip 14. More specifically, the needle tip 14 is operable to interact with a valve seat of the housing 2 for preventing fuel flow through the orifice 13 in a closing position.
  • the needle 4 is displaceable away from the closing position to establish a gap between the valve seat and the needle tip 14 so that fuel flow through the orifice 13 is enabled in opening positions of the valve needle.
  • the needle 4 may comprise a sealing element such as a ball which represents the needle tip 14 and interacts with the valve seat.
  • a valve spring 18 is arranged in the cavity 8 and preloaded so that it is operable to bias the valve needle 4 towards the closing position.
  • a calibration tube 16 is positioned at the end of the valve spring 18 which is remote from the valve needle 4 to preload the valve spring 18.
  • the calibration tube 16 is coupled to the housing 2 by means of a friction-fit connection so that is positionally fix relative to the housing 2 during operation of the fuel injection valve 1 and axially displaceable relative to the housing 1 during manufacturing of the fuel injection valve 1 for calibrating the preload of the valve spring 18.
  • the calibration tube 16 may have a filter for filtering the fuel. After passing the calibration tube 16, the fuel flows through the valve spring 18 which is positioned downstream of the calibration tube 16 in the housing 2.
  • the fuel injection valve 1 comprises an electromagnetic actuator assembly for moving the valve needle 4 away from the closing position against the bias of the valve spring 18.
  • the electromagnetic actuator assembly comprises a magnetic coil 22, a pole element 24 and a movable armature 20.
  • the coil is operable to generate a magnetic field for moving the armature 20 in axial direction towards the pole element 24 relative to the housing 2 until it hits a stop element placed in the housing 2 and fixed thereto.
  • the stop element is represented by the pole element 24.
  • the armature 20 is movably arranged downstream of the valve spring 18 in the housing 2.
  • the armature 20 is made of a metallic material.
  • the valve needle 4 is axially completely penetrating the armature 20, in particular it projects axially from the armature 20 in direction towards the fluid inlet portion 10 and towards the fluid outlet portion 12.
  • the armature 20 is axially displaceable relative to the valve needle 4. This is achieved by a needle channel 26 which is axially penetrating the armature 20 and in which the valve needle 4 is received.
  • the valve needle 4 has a spring seat element 28 which is positioned at the end of the valve needle 4 remote from the needle tip 14 in the present embodiment.
  • the spring seat element 28 is placed between the valve spring 18 and the armature 20. It contacts the valve spring 18 which is biasing the valve needle 4 against the nozzle orifice 13, in particular at the side of the valve spring 18 remote from the calibration tube.
  • the armature 20 comprises or consists of a first armature body 30 and a second armature body 32 which are fixedly coupled with each other.
  • the first armature body 30 is positioned downstream of the spring seat element 28.
  • Channels 34 are axially and completely penetrating the first armature body 30.
  • the second armature body 32 has a recess 36 having a disc-shaped form and being positioned vis-á-vis of the first armature body 30.
  • the recess 36 is not completely penetrating the second armature body 32 so that it has a bottom surface 42 remote from the first armature body 30.
  • the recess 36 may be regarded as a widened portion of the armature channel 26.
  • a portion of the armature channel 26 extends from the bottom surface 42 in axial direction away from the first armature body 30.
  • the valve needle 4 which is movably received in the needle channel 26 has a disc-shaped stopper element 38.
  • the stopper element is fixed to a shaft of the valve needle 4 and extends circumferentially around the shaft.
  • the stopper element 38 is positioned in the recess 36.
  • the axial dimension of the stopper element 38 is smaller than the axial dimension of the recess 36 so that the stopper element 38 is axially displaceable relative to the armature 20 in the recess 36.
  • the needle channel 26 may be generally cylindrically formed and may be a bore.
  • the recess 36 has a larger diameter than the portions of the needle channel 26 upstream and downstream of the recess 36.
  • the stopper element 38 has a larger diameter than the shaft of the valve needle 4. It may protrude radially beyond the portions of the needle channel 26 which are arranged upstream and downstream of the recess 36 so that it overlaps the bottom surface 42 of the recess 36 and a cover surface 40 of the first armature body 30 which delimits the recess at the axial end opposite of the bottom surface 42. Therefore axial displacement of the valve needle 4 is limited by means of mechanical interaction between the stopper element 38 and the armature 20.
  • a side of the stopper element 38 which faces towards the pole element 24 may hit a first surface - the cover surface 40 - of the first armature body 30 when the stopper element 38 moves relative to the recess 36.
  • a side of the stopper element 38 which faces away from the pole element 24 may hit a second surface - the bottom surface 42 of the recess 36 - of the second armature body 32.
  • the first surface (cover surface 40) may come into contact with a third surface of the stopper element 38, the third surface being positioned opposite to the first surface.
  • the third surface is also denoted as stop surface 44 in the following.
  • the second surface (bottom surface 42) may come into contact with a fourth surface 46 of the stopper element 38, the fourth surface being positioned opposite to the second surface.
  • the fourth surface is also denoted as drive surface 46 in the following
  • the spring seat element 28 is configured for guiding the needle.
  • the armature 20 interacts with the stopper element 38 during an injection process to displace the valve needle 4 away from the closing position.
  • a first form-fit connection between the armature 20 and the stopper element 38 initiates the moving of the valve needle 4.
  • the first form-fit connection is established by the contact of the second surface (bottom surface 42) and the fourth surface (drive surface 46).
  • the drive surface 46 is the surface of the stopper element 38 facing away from the pole element 24.
  • a further form-fit connection i.e. a second form-fit connection, can be established between the first surface (cover surface 40) and the third surface (stop surface 44) to limit a movement of the valve needle 4 relatively to the armature 20 at the end of the opening transient of the valve needle 4.
  • the stop surface 44 is the surface of the stopper element 38 facing the pole element 24.
  • Figures 2 to 5 show exemplarily different positions of the armature 20 and of the valve needle 4, together being denoted as armature-needle assembly in the following, during the opening transient of the fuel injection valve 1.
  • Figure 2 shows the armature-needle assembly in a first position when the magnetic coil 22 is deactivated and the nozzle orifice 13 is closed by the needle tip 14 of the valve needle 4.
  • the stopper element 38 contacts the first armature body 30 so that the cover surface 40 and the stop surface 44 contact each other. Between the armature 20 and the stop element 24, an axial distance L1 is established.
  • the armature 20 moves into the direction towards the pole element 24 relative to the housing 2.
  • the valve spring 18 presses the valve needle 4 towards the closing position so that the cover surface 40 of the first armature part 30 disengages from the stop surface 44 of the stopper element 38 and the armature 20 also moves relative to the valve needle until it hits the drive surface 46 of the stopper element 38 with the bottom surface 42 of the recess 36 in the second armature part 32.
  • the common travel of the armature 20 and the valve needle 4 continues until the armature 20 hits the pole element 24 as may be seen in Figure 4 .
  • the hit of the armature 20 against the stop element 24 initiates a decoupling of the stopper element 38 and the second armature body 32 so that the form-fit connection between the bottom surface 42 and the drive surface 46 is released because the armature 20 comes to a rest in contact with the pole element 24 while the valve needle 4 continues its movement due to its inertia.
  • the valve needle 4 can continue its movement for a second small lift L2 until the stop surface 44 of the stopper element 38 reaches the first surface 40 to establish the further form-fit connection. This corresponds to a fourth position of the armature-needle assembly shown in Fig. 5 .
  • the fuel-time diagram as seen in Figure 6 just shows the fuel mass Q in dependence of the time Ti, respectively the pre-described positions of the armature 20 and the valve needle 4 of a conventional fuel injection valve 1.
  • the dotted curve just shows an ideal fuel mass injection over the time.
  • a real injected fuel mass over the time Ti is shown by the solid curve.
  • the valve needle 4 hits the armature 20 at the end of the overshoot. This may accelerate the closing transient, for example due to faster detachment of the armature from the pole element. Therefore the nozzle orifice 13 is closed earlier than expected and the injected mass Q will be lower than desired.
  • the movement of the stopper element 38 away from the bottom surface 42 of the recess 36 may be further damped magnetically.
  • the stopper element 38 is made of a magnetic steel which loses its magnetism after deactivating the magnetic coil 22.
  • the material may be for example AISI 440C, a martensitic steel. This material has preferred magnetic characteristics and a large fatigue strength.
  • the martensitic steel is more preferable than a ferritic steel because of its hardness and strength.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP14179027.9A 2014-07-30 2014-07-30 Soupape d'injection de carburant pour moteurs à combustion interne Withdrawn EP2980395A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14179027.9A EP2980395A1 (fr) 2014-07-30 2014-07-30 Soupape d'injection de carburant pour moteurs à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14179027.9A EP2980395A1 (fr) 2014-07-30 2014-07-30 Soupape d'injection de carburant pour moteurs à combustion interne

Publications (1)

Publication Number Publication Date
EP2980395A1 true EP2980395A1 (fr) 2016-02-03

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EP14179027.9A Withdrawn EP2980395A1 (fr) 2014-07-30 2014-07-30 Soupape d'injection de carburant pour moteurs à combustion interne

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EP (1) EP2980395A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984549A (en) * 1984-03-05 1991-01-15 Coltec Industries Inc. Electromagnetic injection valve
US20110198419A1 (en) * 2010-02-17 2011-08-18 Denso Corporation Fuel injection valve
US20120080542A1 (en) * 2010-10-05 2012-04-05 Denso Corporation Fuel injection valve
JP2012172594A (ja) * 2011-02-22 2012-09-10 Nippon Soken Inc 燃料噴射装置
WO2013060717A1 (fr) 2011-10-26 2013-05-02 Continental Automotive Gmbh Ensemble soupape pour une soupape d'injection et soupape d'injection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984549A (en) * 1984-03-05 1991-01-15 Coltec Industries Inc. Electromagnetic injection valve
US20110198419A1 (en) * 2010-02-17 2011-08-18 Denso Corporation Fuel injection valve
US20120080542A1 (en) * 2010-10-05 2012-04-05 Denso Corporation Fuel injection valve
JP2012172594A (ja) * 2011-02-22 2012-09-10 Nippon Soken Inc 燃料噴射装置
WO2013060717A1 (fr) 2011-10-26 2013-05-02 Continental Automotive Gmbh Ensemble soupape pour une soupape d'injection et soupape d'injection

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