EP1740821A1 - Common rail injector - Google Patents

Common rail injector

Info

Publication number
EP1740821A1
EP1740821A1 EP05716732A EP05716732A EP1740821A1 EP 1740821 A1 EP1740821 A1 EP 1740821A1 EP 05716732 A EP05716732 A EP 05716732A EP 05716732 A EP05716732 A EP 05716732A EP 1740821 A1 EP1740821 A1 EP 1740821A1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
nozzle needle
control
common rail
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.)
Granted
Application number
EP05716732A
Other languages
German (de)
French (fr)
Other versions
EP1740821B1 (en
Inventor
Friedrich Boecking
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1740821A1 publication Critical patent/EP1740821A1/en
Application granted granted Critical
Publication of EP1740821B1 publication Critical patent/EP1740821B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a common rail injector with an injector housing, which has a fuel inlet which communicates with a central high-pressure fuel source outside the injector housing and with a pressure chamber inside the injector housing, from which, depending on the pressure in a control chamber, with High-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle lifts off its seat, the pressure in the control chamber being controlled directly by an actuator, in particular a piezo actuator.
  • the object of the invention is to provide a common rail injector with an injector housing which has a fuel inlet which is connected to a central one High-pressure fuel source outside the injector housing and communicates with a pressure chamber within the injector housing, from which high-pressure fuel is injected depending on the pressure in a control chamber into a combustion chamber of an internal combustion engine when a nozzle needle lifts off its seat, the pressure in the Control space is controlled directly by an actuator, in particular a piezo actuator, which, particularly in terms of length, requires less installation space than conventional injectors.
  • the task is for a common rail injector with an injector housing which has a fuel inlet which is connected to a central high-pressure fuel source outside the injector housing and to a pressure chamber inside the injector housing, from which, depending on the pressure in a control chamber, high-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle lifts from its seat, the pressure in the control chamber being controlled directly by an actuator, in particular a piezo actuator, in that a control chamber limiting sleeve is located in the end of the nozzle needle remote from the combustion chamber is movably received back and forth, by means of which the end face of the nozzle needle which is remote from the combustion chamber and is acted upon by the control chamber pressure is reduced.
  • an actuator in particular a piezo actuator
  • the control room can be connected to an actuator room which is delimited by an end face of the actuator or by an actuator head coupled to the actuator or attached to the actuator.
  • the control space is artificially reduced by the control space boundary sleeve. Therefore, the pressure difference required to open and close the nozzle needle in the control room can be lower than with conventional injectors with inverse control. This has the advantage that shorter actuators can be used.
  • a preferred embodiment of the injector is characterized in that the outer diameter of the control space limiting sleeve is smaller than the outer diameter of the nozzle needle in the region of its seat. It is thereby achieved that the area of the nozzle needle pressurized in the control chamber can be designed only slightly larger than the area of the nozzle needle pressurized in the opposite direction.
  • Another preferred exemplary embodiment of the injector is characterized in that a biting edge is formed radially on the outside of the combustion chamber end of the control space limiting sleeve. The biting edge comes into contact with the injector housing in a sealing manner in order to delimit the control space radially on the inside.
  • Another preferred exemplary embodiment of the injector is characterized in that the control space limiting sleeve has a central through hole which is connected to a leakage oil channel which is recessed in the injector housing. Leak oil entering the interior of the control space limiting sleeve can be discharged through the leak oil channel. In addition, the inside of the control space limiting sleeve is relieved of pressure by the leakage oil channel.
  • a further preferred exemplary embodiment of the injector is characterized in that a blind hole is left in the end of the nozzle needle remote from the combustion chamber, which has a guide section in which the control space limiting sleeve is guided in a sealing manner. This enables the nozzle needle to move without the control space limiting sleeve also moving.
  • Another preferred exemplary embodiment of the injector is characterized in that a bias spring for the control space limiting sleeve is arranged in the blind hole.
  • the biasing spring serves to hold the control space limiting sleeve in contact with the injector housing when the nozzle needle rests on its seat.
  • Another preferred exemplary embodiment of the injector is characterized in that the control space is delimited radially on the outside by a further control space delimitation sleeve which is guided so that it can move back and forth at the end of the nozzle needle remote from the combustion chamber.
  • the one of the two control room The limiting chamber has a control chamber in the form of an annular space which is delimited in the axial direction by the end face of the nozzle needle remote from the combustion chamber and the injector housing.
  • the control chamber is connected to an actuator pressure chamber which is delimited in the injector housing by a piezo actuator.
  • the piezo actuator is preferably continuously energized, so that the nozzle needle is in the closed position.
  • the pressure in the actuator pressure chamber and the control chamber communicating with it decreases, so that the nozzle needle lifts off its seat and releases at least one spray hole through which high-pressure fuel is injected into the combustion chamber .
  • This type of control is also referred to as inverse control.
  • the accompanying figure shows an embodiment of a common rail injector according to the invention in longitudinal section.
  • the common rail injector shown has an injector housing designated overall by 1.
  • the injector housing 1 comprises a nozzle body 2 which, with its lower free end protrudes the combustion chamber of the internal combustion engine to be supplied. With its upper end face remote from the combustion chamber, the nozzle body 2 is clamped axially against an intermediate body 3 and an injector body 4 by means of a clamping nut (not shown).
  • An axial guide bore 6 is recessed in the nozzle body 2.
  • a nozzle needle 8 is guided axially displaceably in the guide bore 6.
  • a sealing edge 10 is formed, which cooperates with a sealing seat or a sealing surface 11, which is formed on the nozzle body 2.
  • a spray hole 13 is closed in the nozzle body 2. If the nozzle needle tip 9 lifts off with its sealing edge 10 from its sealing seat 11, then high-pressure fuel is injected through the spray hole 13 or more spray holes into the combustion chamber of the internal combustion engine.
  • the nozzle needle 8 has a pressure chamber section 15 which is essentially in the form of a circular cylinder.
  • the pressure chamber section 15 is followed by a truncated cone section 16.
  • the sections 15 and 16 are arranged in a pressure chamber 17 which is formed in the nozzle body 2.
  • a substantially circular cylindrical guide section 18 follows the section 16, which widens like a truncated cone.
  • the guide section 18 is guided to move back and forth in the axial guide bore 6 of the nozzle body 2.
  • a flat 20 or a plurality of flats, which is or are formed on the guide section a fluid connection is created between the pressure chamber 17 and a nozzle spring chamber 22, which is provided on the end of the nozzle body 2 remote from the combustion chamber.
  • An arrow 21 indicates that high-pressure fuel is fed into the nozzle spring chamber 22 via an inlet channel 23, which is recessed in the intermediate body 3 and is connected to a high-pressure source (not shown). From the nozzle spring chamber 22, the fuel subjected to high pressure passes the flattened area 20 into the pressure chamber 17.
  • the high-pressure fuel source (not shown) is also referred to as a common rail.
  • a collar 24 is formed on the nozzle needle 8 and forms a stop for a spring plate 25.
  • One end of a prestressed nozzle spring 27 bears against the spring plate 25 and is arranged or guided radially outside a substantially circular-cylindrical control section 29 which is formed on the end of the nozzle needle 8 remote from the combustion chamber.
  • an outer control chamber limiting sleeve 31 is guided, which has a bite edge 32.
  • the bite edge 32 of the outer control space limiting sleeve 31 lies against the intermediate body 3.
  • a central blind hole 33 is formed in the end of the nozzle needle 8 that is remote from the combustion chamber and forms a receiving space 35 for a sealing spring 36.
  • the blind hole 33 merges into a guide section 37, through which an inner control space limiting sleeve 38 is guided so that it can move back and forth.
  • the inner control space limiting sleeve 38 has an outer diameter 40 which is approximately smaller than the outer diameter 12 of the sealing edge 10 at the tip 9 of the nozzle needle 8.
  • a bite edge 41 is formed, with which the inner control chamber limiting sleeve 38 bears against the intermediate body 3.
  • the inner control space delimitation sleeve 38 has a central through hole 43 which is connected to a leakage oil connection channel 45, which is formed in the intermediate body 3 and within the area of the intermediate body 3 delimited by the biting edge 41 in the area of the inner body Control room limiting sleeve 38 delimits the interior.
  • the leak oil connection channel 45 in the intermediate body 3 continues in a leak oil channel 46 in the injector body 4.
  • the inner control space limiting sleeve 38 and the outer control space limiting sleeve 31 delimit a control space 50 in the radial direction, which is delimited in the axial direction by the end face of the nozzle needle 8 and the intermediate body 3 remote from the combustion chamber.
  • the control room 50 has the shape of an annulus, which through control room connecting channels 52 and 53, which are formed in the intermediate body 3, is connected to an actuator pressure space which is formed in the injector body 4.
  • the actuator pressure chamber 55 is delimited in the axial direction on the side remote from the combustion chamber by an actuator 56 and on the side near the combustion chamber by the intermediate body 3.
  • the actuator pressure chamber 55 is delimited radially on the outside by an actuator sleeve 58.
  • the actuator pressure chamber 55 is connected to the inlet channel 23 via connecting channels (not shown), so that the actuator pressure chamber 55 is filled with fuel under high pressure.
  • a biting edge 57 is formed on the actuator sleeve 58 and bears against the intermediate body 3.
  • Actuator 56 is a piezo actuator that has a larger volume in the energized state than in the de-energized state.
  • a double arrow 60 indicates that the actuator 56 can deform such that the pressure in the actuator pressure chamber 55 and the control chamber 50 connected therewith increases or decreases.
  • the actuator which is otherwise continuously energized, is relieved, then the pressure in the actuator pressure chamber 55 and the control chamber 50 connected therewith drops.
  • the pressurized surfaces of the nozzle needle 8 are designed such that the nozzle needle 8 then has its sealing edge 10 lifts off the sealing seat 11 so that high pressure ter fuel is injected from the pressure chamber 17 through the spray hole 13 into the combustion chamber of the internal combustion engine.
  • the gas back pressure of the combustion chamber acts on the nozzle needle.
  • the use of the inner control space limiting sleeve 38 can artificially reduce the control space 50, since leakage oil pressure prevails in the inner region of the inner control space limiting sleeve 38.
  • the diameter 40 of the inner control space limiting sleeve 38 is preferably designed such that it is smaller than the diameter 12 of the sealing edge 10 of the nozzle needle 8. When designing, care must be taken that the sum of the forces in the area of the sealing seat 11 is less than the force that results from the pressure forces acting in the control chamber 50 and the spring forces of the nozzle spring 27 and the sealing spring 36.

Abstract

A common rail injector having an injector housing that has a fuel inlet, which communicates with a central high-pressure fuel source outside the injector housing and with a pressure chamber inside the injector housing, from the latter of which, depending on the pressure in a control chamber, highly pressurized fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle lifts away from its seat, and in which the pressure in the control chamber is directly controlled by a piezoelectric actuator. The end of the nozzle needle oriented away from the combustion chamber accommodates a control chamber delimiting sleeve that can move back and forth and reduce the size of the control chamber-pressurized end surface of the nozzle needle oriented away from the combustion chamber.

Description

Common-Rail-I jektorCommon rail injector
Beschreibungdescription
Die Erfindung betrifft einen Common-Rail-Injektor mit einem Injektorgehäuse, das einen KraftStoffZulauf aufweist, der mit einer zentralen Kraftstoffhochdruckquelle außerhalb des Injektorgehäuses und mit einem Druckraum innerhalb des Injektorgehäuses in Verbindung steht, aus dem, in Abhängigkeit von dem Druck in einem Steuerraum, mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird, wenn eine Düsennadel von ihrem Sitz abhebt, wobei der Druck in dem Steuerraum durch einen Aktor, insbesondere einen Piezoaktor, direkt gesteuert wird.The invention relates to a common rail injector with an injector housing, which has a fuel inlet which communicates with a central high-pressure fuel source outside the injector housing and with a pressure chamber inside the injector housing, from which, depending on the pressure in a control chamber, with High-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle lifts off its seat, the pressure in the control chamber being controlled directly by an actuator, in particular a piezo actuator.
Wenn der Druck in dem Steuerraum direkt durch eine Verformung des Aktors, insbesondere eines Piezoak- tors, gesteuert wird, dann spricht man auch von einer direkten Düsennadelsteuerung. Herkömmliche Common-Rail-Injektoren mit direkter Düsennadelsteuerung benötigen, insbesondere in der Länge, relativ viel Baurau .If the pressure in the control room is controlled directly by a deformation of the actuator, in particular a piezo actuator, then one speaks of a direct nozzle needle control. Conventional common rail injectors with direct nozzle needle control require a relatively large amount of construction space, particularly in terms of length.
Aufgabe der Erfindung ist es, einen Common-Rail- Injektor mit einem Injektorgehäuse, das einen Kraftstoffzulauf aufweist, der mit einer zentralen Kraftstoffhochdruckquelle außerhalb des Injektorgehäuses und mit einem Druckraum innerhalb des Injektorgehäuses in Verbindung steht, aus dem mit Hochdruck beaufschlagter Kraftstoff in Abhängigkeit von dem Druck in einem Steuerraum in einen Brennraum einer Brennkraftmaschine eingespritzt wird, wenn eine Düsennadel von ihrem Sitz abhebt, wobei der Druck in dem Steuerraum durch einen Aktor, insbesondere einen Piezoaktor, direkt gesteuert wird, zu schaffen, der, insbesondere in der Länge, weniger Bauraum benötigt als herkömmliche Injektoren.The object of the invention is to provide a common rail injector with an injector housing which has a fuel inlet which is connected to a central one High-pressure fuel source outside the injector housing and communicates with a pressure chamber within the injector housing, from which high-pressure fuel is injected depending on the pressure in a control chamber into a combustion chamber of an internal combustion engine when a nozzle needle lifts off its seat, the pressure in the Control space is controlled directly by an actuator, in particular a piezo actuator, which, particularly in terms of length, requires less installation space than conventional injectors.
Darstellung der ErfindungPresentation of the invention
Die Aufgabe ist bei einem Common-Rail-Injektor mit einem Injektorgehäuse, das einen KraftStoffZulauf aufweist, der mit einer zentralen Kraftstoffhochdruckquelle außerhalb des Injektorgehäuses und mit einem Druckraum innerhalb des Injektorgehäuses in Verbindung steht, aus dem, in Abhängigkeit von dem Druck in einem Steuerraum, mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird, wenn eine Düsennadel von ihrem Sitz abhebt, wobei der Druck in dem Steuerraum durch einen Aktor, insbesondere einen Piezoaktor, direkt gesteuert wird, dadurch gelöst, dass in dem brennraumfernen Ende der Düsennadel eine Steuerraumbegrenzungshülse hin und her bewegbar aufgenommen ist, durch welche die durch den Steuerraumdruck beaufschlagte brennraumferne Stirnfläche der Düsennadel verkleinert wird. Im Zusammenhang mit der vorliegenden Erfindung wird unter einem direkten Steuern des Drucks in dem Steuerraum das Erzeugen eines Druckabfalls und/oder eines Druckanstiegs infolge einer Volumenänderung des Aktors verstanden. Um eine solche direkte Steuerung zu ermöglichen, kann der Steuerraum mit einem Aktorraum in Verbindung stehen, der durch eine Stirn- fläche des Aktors oder eines mit dem Aktor gekoppelten beziehungsweise an dem Aktor angebrachten Aktorkopfs begrenzt wird. Durch die Steuerraumbe- grenzungshülse wird der Steuerraum künstlich verkleinert. Daher kann die zum Öffnen und Schließen der Düsennadel erforderliche Druckdifferenz im Steuerraum geringer ausfallen als bei herkömmlichen Injektoren mit inverser Ansteuerung. Das liefert den Vorteil, dass kürzere Aktoren verwendet werden können.The task is for a common rail injector with an injector housing which has a fuel inlet which is connected to a central high-pressure fuel source outside the injector housing and to a pressure chamber inside the injector housing, from which, depending on the pressure in a control chamber, high-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle lifts from its seat, the pressure in the control chamber being controlled directly by an actuator, in particular a piezo actuator, in that a control chamber limiting sleeve is located in the end of the nozzle needle remote from the combustion chamber is movably received back and forth, by means of which the end face of the nozzle needle which is remote from the combustion chamber and is acted upon by the control chamber pressure is reduced. In the context of the present invention, under direct control of the pressure in the control room is generating a pressure drop and / or Understand pressure increase due to a change in volume of the actuator. In order to enable such direct control, the control room can be connected to an actuator room which is delimited by an end face of the actuator or by an actuator head coupled to the actuator or attached to the actuator. The control space is artificially reduced by the control space boundary sleeve. Therefore, the pressure difference required to open and close the nozzle needle in the control room can be lower than with conventional injectors with inverse control. This has the advantage that shorter actuators can be used.
Ein bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass der Außendurchmesser der Steuerraumbegrenzungshülse kleiner als der Außendtarchmesser der Düsennadel im Bereich ihres<r Sitzes ist. Dadurch wird erreicht, dass die im Steuerraum angeordnete druckbeaufschlagte Fläche der Düsennadel nur geringfügig größer als die in der entgegengesetzten Richtung druckbeaufschlagte Fläche der Düsennadel ausgelegt werden kann.A preferred embodiment of the injector is characterized in that the outer diameter of the control space limiting sleeve is smaller than the outer diameter of the nozzle needle in the region of its seat. It is thereby achieved that the area of the nozzle needle pressurized in the control chamber can be designed only slightly larger than the area of the nozzle needle pressurized in the opposite direction.
Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass an dem brennraumfernen Ende der Steuerraumbegrenzungshülse radial außen eine Beißkante ausgebildet ist. Die Beißkante kommt in abdichtender Weise an dem Injektorgehäuse zur Anlage, um den Steuerraum radial innen zu begrenzen. Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass die Steuerraumbegrenzungshülse ein zentrales Durchgangsloch aufweist, das mit einem Leckölkanal in Verbindung steht, der in dem Injektorgehäuse ausgespart ist. Durch den Leckölkanal kann aus dem Steuerraum in das Innere der Steuerraumbegrenzungshülse eintretendes Lecköl abgeführt werden. Außerdem wird das Innere der Steuerraumbegrenzungshülse durch den Leckageölkanal druckentlastet.Another preferred exemplary embodiment of the injector is characterized in that a biting edge is formed radially on the outside of the combustion chamber end of the control space limiting sleeve. The biting edge comes into contact with the injector housing in a sealing manner in order to delimit the control space radially on the inside. Another preferred exemplary embodiment of the injector is characterized in that the control space limiting sleeve has a central through hole which is connected to a leakage oil channel which is recessed in the injector housing. Leak oil entering the interior of the control space limiting sleeve can be discharged through the leak oil channel. In addition, the inside of the control space limiting sleeve is relieved of pressure by the leakage oil channel.
Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass in dem brennraumfernen Ende der Düsennadel ein Sackloch ausgespart ist, das einen Führungsabschnitt aufweist, in welchem die Steuerraumbegrenzungshülse in abdichtender Weise geführt ist. Dadurch wird eine Bewegung der Düsennadel ermöglicht, ohne dass sich die Steuerraumbegrenzungshülse mit bewegt.A further preferred exemplary embodiment of the injector is characterized in that a blind hole is left in the end of the nozzle needle remote from the combustion chamber, which has a guide section in which the control space limiting sleeve is guided in a sealing manner. This enables the nozzle needle to move without the control space limiting sleeve also moving.
Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass in dem Sackloch eine Vorspannfeder für die Steuerraumbegrenzungshülse angeordnet ist. Die Vorspannfeder dient dazu, die Steuerraumbegrenzungshülse an dem Injektorgehäuse in Anlage zu halten, wenn die Düsennadel an ihrem Sitz anliegt.Another preferred exemplary embodiment of the injector is characterized in that a bias spring for the control space limiting sleeve is arranged in the blind hole. The biasing spring serves to hold the control space limiting sleeve in contact with the injector housing when the nozzle needle rests on its seat.
Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass der Steuerraum radial außen durch eine weitere Steuerraumbegrenzungshülse begrenzt ist, die an dem brennraumfernen Ende der Düsennadel hin und her bewegbar geführt ist. Der von den beiden Steuerraum- begrenzungshülsen begrenzte Steuerraum hat die Gestalt eines Ringraums, der in axialer Richtung durch die brennraumferne Stirnfläche der Düsennadel und das Injektorgehäuse begrenzt ist.Another preferred exemplary embodiment of the injector is characterized in that the control space is delimited radially on the outside by a further control space delimitation sleeve which is guided so that it can move back and forth at the end of the nozzle needle remote from the combustion chamber. The one of the two control room The limiting chamber has a control chamber in the form of an annular space which is delimited in the axial direction by the end face of the nozzle needle remote from the combustion chamber and the injector housing.
Ein weiteres bevorzugtes Ausführungsbeispiel des Injektors ist dadurch gekennzeichnet, dass der Steuerraum mit einem Aktordruckraum in Verbindung steht, der in dem Injektorgehäuse durch einen Pie- zoaktor begrenzt wird. Vorzugsweise ist der Piezoaktor dauernd bestromt, so dass sich die Düsennadel in Schließstellung befindet . Wenn der Piezoaktor entlastet wird, dann sinkt der Druck in dem Ak- tordruck-raum und dem damit kommunizierenden Steu- erraum, so dass die Düsennadel von ihrem Sitz abhebt und mindestens ein Spritzloch freigibt, durch das mit Hochdruck beaufschlagter Kraftstoff in den Brennraum eingespritzt wird. Diese Art der Ansteue- rung wird auch als inverse Ant-euerung bezeichnet.Another preferred exemplary embodiment of the injector is characterized in that the control chamber is connected to an actuator pressure chamber which is delimited in the injector housing by a piezo actuator. The piezo actuator is preferably continuously energized, so that the nozzle needle is in the closed position. When the piezo actuator is relieved, the pressure in the actuator pressure chamber and the control chamber communicating with it decreases, so that the nozzle needle lifts off its seat and releases at least one spray hole through which high-pressure fuel is injected into the combustion chamber , This type of control is also referred to as inverse control.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrie- ben ist.Further advantages, features and details of the invention result from the following description, in which an exemplary embodiment is described in detail with reference to the drawing.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die beiliegende Figur zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Common-Rail-Injektors im Längsschnitt. Der dargestellte Common-Rail-Injektor weist ein insgesamt mit 1 bezeichnetes Injektorgehäuse auf. Das Injektorgehäuse 1 umfasst einen Düsenkörper 2, der mit seinem unteren freien Ende in den Brennraum der zu versorgenden Brennkraftmaschine ragt. Mit seiner oberen, brennraumfernen Stirnfläche ist der Düsenkörper 2 mittels einer (nicht dargestellten) Spannmutter axial gegen einen Zwi- schenkörper 3 und einen Injektorkörper 4 verspannt.The accompanying figure shows an embodiment of a common rail injector according to the invention in longitudinal section. The common rail injector shown has an injector housing designated overall by 1. The injector housing 1 comprises a nozzle body 2 which, with its lower free end protrudes the combustion chamber of the internal combustion engine to be supplied. With its upper end face remote from the combustion chamber, the nozzle body 2 is clamped axially against an intermediate body 3 and an injector body 4 by means of a clamping nut (not shown).
In dem Düsenkörper 2 ist eine axiale Führungsbohrung 6 ausgespart. In der Führungsbohrung 6 ist eine Düsennadel 8 axial verschiebbar geführt. An der Spitze 9 der Düsennadel 8 ist eine Dichtkante 10 ausgebildet, die mit einem Dichtsitz beziehungsweise einer Dichtfläche 11 zusammenwirkt, der beziehungsweise die an dem Düsenkörper 2 ausgebildet ist. Wenn sich die Spitze 9 der Düsennadel 8 mit ihrer Dichtkante 10 in Anlage an dem Dichtsitz 11 befindet, ist ein Spritzloch 13 in dem Düsenkörper 2 verschlossen. Wenn die Düsennadelspitze 9 mit der Dichtkante 10 vom ihrem Dichtsitz 11 abhebt, dann wird mit Hochdruck beaufschlagter Kraftstoff durch das Spritzloch 13 oder mehrere Spritzlöcher in den Brennraum der Brennkraftmaschine eingespritzt.An axial guide bore 6 is recessed in the nozzle body 2. A nozzle needle 8 is guided axially displaceably in the guide bore 6. At the tip 9 of the nozzle needle 8, a sealing edge 10 is formed, which cooperates with a sealing seat or a sealing surface 11, which is formed on the nozzle body 2. When the tip 9 of the nozzle needle 8 is in contact with the sealing seat 11 with its sealing edge 10, a spray hole 13 is closed in the nozzle body 2. If the nozzle needle tip 9 lifts off with its sealing edge 10 from its sealing seat 11, then high-pressure fuel is injected through the spray hole 13 or more spray holes into the combustion chamber of the internal combustion engine.
Ausgehend von der Spitze 9 weist die Düsennadel 8 einen Druckraumabschnitt 15 auf, der im Wesentli- chen kreiszylinderförmig ausgebildet ist. Auf den Druckraumabschnitt 15 folgt ein sich kegelstumpfartig erweiternder Abschnitt 16. Die Abschnitte 15 und 16 sind in einem Druckraum 17 angeordnet, der in dem Düsenkörper 2 ausgebildet ist. Auf den sich kegelstumpfartig erweiternden Abschnitt 16 folgt ein im Wesentlichen kreiszylinderförmiger Führungsabschnitt 18. Der Führungsabschnitt 18 ist in der axialen Führungsbohrung 6 des Düsenkörpers 2 hin und her bewegbar geführt. Durch eine Abflachung 20 oder mehrere Abflachungen, die an dem Führungsabschnitt ausgebildet ist beziehungsweise sind, wird eine Fluidverbindung zwischen dem Druckraum 17 und einem Düsenfederräum 22 geschaffen, der an dem brennraumfernen Ende des Düsenkörpers 2 vorgesehen ist.Starting from the tip 9, the nozzle needle 8 has a pressure chamber section 15 which is essentially in the form of a circular cylinder. The pressure chamber section 15 is followed by a truncated cone section 16. The sections 15 and 16 are arranged in a pressure chamber 17 which is formed in the nozzle body 2. A substantially circular cylindrical guide section 18 follows the section 16, which widens like a truncated cone. The guide section 18 is guided to move back and forth in the axial guide bore 6 of the nozzle body 2. By a flat 20 or a plurality of flats, which is or are formed on the guide section, a fluid connection is created between the pressure chamber 17 and a nozzle spring chamber 22, which is provided on the end of the nozzle body 2 remote from the combustion chamber.
Durch einen Pfeil 21 ist angedeutet, dass mit Hochdruck beaufschlagter Kraftstoff über einen Zulauf- kanal 23, der in dem Zwischenkörper 3 ausgespart ist und mit einer (nicht dargestellten) Hochdruckquelle in Verbindung steht, in den Düsenfederraum 22 eingespeist wird. Aus dem Düsenfederraum 22 gelangt der mit Hochdruck beaufschlagte Kraftstoff an der Abflachung 20 vorbei in den Druckraum 17. Die (nicht dargestellte) Kraftstoffhochdruckquelle wird auch als Common-Rail bezeichnet.An arrow 21 indicates that high-pressure fuel is fed into the nozzle spring chamber 22 via an inlet channel 23, which is recessed in the intermediate body 3 and is connected to a high-pressure source (not shown). From the nozzle spring chamber 22, the fuel subjected to high pressure passes the flattened area 20 into the pressure chamber 17. The high-pressure fuel source (not shown) is also referred to as a common rail.
Im Anschluss an -den Führungsabschnitt 18 ist an der Düsennadel 8 ein Bund 24 ausgebildet, der einen Anschlag für einen Federteller 25 bildet. An dem Federteller 25 liegt ein Ende einer vorgespannten Düsenfeder 27 an, die radial außerhalb eines im Wesentlichen kreiszylinderförmigen Steuerabschnitts 29 angeordnet beziehungsweise geführt ist, der an dem brennraumfernen Ende der Düsennadel 8 ausgebildet ist.Following the guide section 18, a collar 24 is formed on the nozzle needle 8 and forms a stop for a spring plate 25. One end of a prestressed nozzle spring 27 bears against the spring plate 25 and is arranged or guided radially outside a substantially circular-cylindrical control section 29 which is formed on the end of the nozzle needle 8 remote from the combustion chamber.
An dem Steuerabschnitt 29 am brennraumfernen Ende der Düsennadel 8 ist eine äußere Steuerraumbegrenzungshülse 31 geführt, die eine Beißkante 32 aufweist. Die Beißkante 32 der äußeren Steuerraumbegrenzungshülse 31 liegt an dem Zwischenkörper 3 an. In dem brennraumfernen Ende der Düsennadel 8 ist ein zentrales Sackloch 33 ausgespart, das einen Aufnahmeraum 35 für eine Dichtfeder 36 bildet. Zum brennraumfernen Ende der Düsennadel 8 hin geht das Sackloch 33 in einen Führungsabschnitt 37 über, durch den eine innere Steuerraumbegrenzungshülse 38 hin und her bewegbar geführt ist. Die innere Steuerraumbegrenzungshülse 38 weist einen Außendurchmesser 40 auf, der etwa kleiner als der Außendurch- messer 12 der Dichtkante 10 an der Spitze 9 der Düsennadel 8 ist.On the control section 29 at the end of the nozzle needle 8 remote from the combustion chamber, an outer control chamber limiting sleeve 31 is guided, which has a bite edge 32. The bite edge 32 of the outer control space limiting sleeve 31 lies against the intermediate body 3. A central blind hole 33 is formed in the end of the nozzle needle 8 that is remote from the combustion chamber and forms a receiving space 35 for a sealing spring 36. Towards the end of the nozzle needle 8 remote from the combustion chamber, the blind hole 33 merges into a guide section 37, through which an inner control space limiting sleeve 38 is guided so that it can move back and forth. The inner control space limiting sleeve 38 has an outer diameter 40 which is approximately smaller than the outer diameter 12 of the sealing edge 10 at the tip 9 of the nozzle needle 8.
An dem brennraumfernen Ende der inneren Steuerraumbegrenzungshülse 38 ist eine Beißkante 41 ausgebil- det, mit der die innere Steuerraumbegrenzungshülse 38 an dem Zwischenkörper 3 anliegt. Die innere Steuerraumbegrenzungshülse 38 weist ein zentrales Durchgangsloch 43 auf, das mit einem Leckölverbin- dungskanal..45 in Verbindung steht, der in dem Zwi- schenkörper 3 ausgebildet ist und innerhalb der von der Beißkante 41 begrenzten Fläche des Zwischenkörpers 3 in den von der inneren Steuerraumbegrenzungshülse 38 begrenzten Innenraum mündet. Der Leckölverbindungskanal 45 in dem Zwischenkörper 3 setzt sich in einem Leckölkanal 46 in dem Injektorkörper 4 fort .At the end of the inner control chamber limiting sleeve 38 remote from the combustion chamber, a bite edge 41 is formed, with which the inner control chamber limiting sleeve 38 bears against the intermediate body 3. The inner control space delimitation sleeve 38 has a central through hole 43 which is connected to a leakage oil connection channel 45, which is formed in the intermediate body 3 and within the area of the intermediate body 3 delimited by the biting edge 41 in the area of the inner body Control room limiting sleeve 38 delimits the interior. The leak oil connection channel 45 in the intermediate body 3 continues in a leak oil channel 46 in the injector body 4.
Die innere Steuerraumbegrenzungshülse 38 und die äußere Steuerraumbegrenzungshülse 31 begrenzen in radialer Richtung einen Steuerraum 50, der in axialer Richtung von der brennraumfernen Stirnfläche der Düsennadel 8 und dem Zwischenkörper 3 begrenzt wird. Der Steuerraum 50 hat die Gestalt eines Ringraums, der durch Steuerraumverbindungskanäle 52 und 53, die in dem Zwischenkörper 3 ausgebildet sind, mit einem Aktordruckraum in Verbindung steht, der in dem Injektorkörper 4 ausgebildet. Der Aktordruckraum 55 wird in axialer Richtung auf der brennraumfernen Seite durch einen Aktor 56 und auf der brennraumnahen Seite durch den Zwischenkörper 3 begrenzt. Radial außen wird der Aktordruckraum 55 durch eine Aktorhülse 58 begrenzt. Der Aktordruckraum 55 steht über (nicht dargestellte) Verbindungskanäle mit dem Zulaufkanal 23 in Verbindung, so dass der Aktordruckraum 55 mit unter Hochdruck stehendem Kraftstoff gefüllt ist. An der Aktorhülse 58 ist eine Beißkante 57 ausgebildet, die an dem Zwischenkörper 3 anliegt. An dem entgegenge- setzten Ende der Aktorhülse 58 liegt eine Aktorfe- der 59 an, durch den die Aktorhülse 58 mit der Beißkante 57 an dem Zwischenkörper 3 in Anlage gehalten wird.The inner control space limiting sleeve 38 and the outer control space limiting sleeve 31 delimit a control space 50 in the radial direction, which is delimited in the axial direction by the end face of the nozzle needle 8 and the intermediate body 3 remote from the combustion chamber. The control room 50 has the shape of an annulus, which through control room connecting channels 52 and 53, which are formed in the intermediate body 3, is connected to an actuator pressure space which is formed in the injector body 4. The actuator pressure chamber 55 is delimited in the axial direction on the side remote from the combustion chamber by an actuator 56 and on the side near the combustion chamber by the intermediate body 3. The actuator pressure chamber 55 is delimited radially on the outside by an actuator sleeve 58. The actuator pressure chamber 55 is connected to the inlet channel 23 via connecting channels (not shown), so that the actuator pressure chamber 55 is filled with fuel under high pressure. A biting edge 57 is formed on the actuator sleeve 58 and bears against the intermediate body 3. At the opposite end of the actuator sleeve 58 there is an actuator spring 59, by means of which the actuator sleeve 58 is held in contact with the bite edge 57 on the intermediate body 3.
Bei dem Aktor 56 handelt es sich um einen Piezoaktor, der im bestromten Zustand ein größeres Volumen aufweist als im unbestromten Zustand. Durch einen Doppelpfeil 60 ist angedeutet, dass sich der Aktor 56 so verformen kann, dass der Druck im Ak- tordruckraum 55 und dem damit in Verbindung stehenden Steuerraum 50 zu- oder abnimmt.Actuator 56 is a piezo actuator that has a larger volume in the energized state than in the de-energized state. A double arrow 60 indicates that the actuator 56 can deform such that the pressure in the actuator pressure chamber 55 and the control chamber 50 connected therewith increases or decreases.
Wenn der Aktor, der ansonsten dauernd bestromt ist, entlastet wird, dann sinkt der Druck in dem Ak- tordruckraum 55 und dem damit in Verbindung stehenden Steuerraum 50. Die druckbeaufschlagten Flächen der Düsennadel 8 sind so ausgelegt, dass die Düsennadel 8 dann mit ihrer Dichtkante 10 von dem Dichtsitz 11 abhebt, so dass mit Hochdruck beaufschlag- ter Kraftstoff aus dem Druckraum 17 durch das Spritzloch 13 in den Brennraum der Brennkraftmaschine eingespritzt wird.If the actuator, which is otherwise continuously energized, is relieved, then the pressure in the actuator pressure chamber 55 and the control chamber 50 connected therewith drops. The pressurized surfaces of the nozzle needle 8 are designed such that the nozzle needle 8 then has its sealing edge 10 lifts off the sealing seat 11 so that high pressure ter fuel is injected from the pressure chamber 17 through the spray hole 13 into the combustion chamber of the internal combustion engine.
Unterhalb der Dichtkante 10 wirkt der Gasgegendruck des Brennraums auf die Düsennadel . Oberhalb der Dichtkante 10 wirkt der über den Zulaufkanal 23 gelieferte Hochdruck, der auch als Common-Rail-Druck bezeichnet wird, auf die Düsennadel 8. Wenn die Dü- se geöffnet werden soll, dann muss im Bereich des Steuerraums 50 ein Kräftegleichgewicht zu dem Common-Rail-Druck auf den Durchmesser 12 erzeugt werden. Zum Abheben der Düsennadel 8 wird der Druck im Steuerraum 50 mit Hilfe des Aktors 56 abgesenkt.Below the sealing edge 10, the gas back pressure of the combustion chamber acts on the nozzle needle. Above the sealing edge 10, the high pressure supplied via the inlet channel 23, which is also referred to as common rail pressure, acts on the nozzle needle 8. If the nozzle is to be opened, a force equilibrium with the common must be in the area of the control chamber 50 -Rail pressure can be generated on the diameter 12. To lift the nozzle needle 8, the pressure in the control chamber 50 is lowered with the aid of the actuator 56.
Der den Einsatz der inneren Steuerraumbegrenzungshülse 38 kann der Steuerraum 50 künstlich verkleinert werden, da im Innenbereich der inneren Steuerraumbegrenzungshülse 38 Lecköldruck .herrscht. Der Durchmesser 40 der inneren Steuerraumbegrenzungshülse 38 wird vorzugsweise so ausgelegt, dass er kleiner als der Durchmesser 12 der Dichtkante 10 der Düsennadel 8 ist. Bei der Auslegung ist darauf zu achten, dass die Summe der Kräfte im Bereich des Dichtsitzes 11 kleiner als die Kraft ist, die aus den im Steuerraum 50 wirkenden Druckkräften und den Federkräften der Düsenfeder 27 und der Dichtfeder 36 resultiert. The use of the inner control space limiting sleeve 38 can artificially reduce the control space 50, since leakage oil pressure prevails in the inner region of the inner control space limiting sleeve 38. The diameter 40 of the inner control space limiting sleeve 38 is preferably designed such that it is smaller than the diameter 12 of the sealing edge 10 of the nozzle needle 8. When designing, care must be taken that the sum of the forces in the area of the sealing seat 11 is less than the force that results from the pressure forces acting in the control chamber 50 and the spring forces of the nozzle spring 27 and the sealing spring 36.

Claims

Patentansprüche claims
1. Common-Rail-Injektor mit einem Injektorgehäuse (1) , das einen Kraftstoffzulauf (23) aufweist, der mit einer zentralen Kraftstoffhochdruckquelle außerhalb des Injektorgehäuses und mit einem Druck- räum (17) innerhalb des Injektorgehäuses in Verbindung steht, aus dem, in Abhängigkeit von dem Druck in einem Steuerraum (50) , mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird, wenn eine Dü- sennadel (8) von ihrem Sitz (11) abhebt, wobei der Druck in dem Steuerraum (50) durch einen Aktor (56) , insbesondere einen Piezoaktor, direkt gesteuert wird, dadurch gekennzeichnet, dass in dem brennraumfernen Ende .-der Düsennadel (8) eine Steu- erraumbegrenzungshülse (38) hin und her bewegbar aufgenommen ist, durch welche die durch den Steuerraumdruck beaufschlagte brennraumferne Stirnfläche der Düsennadel (8) verkleinert wird.1. Common rail injector with an injector housing (1) which has a fuel inlet (23) which is connected to a central high-pressure fuel source outside the injector housing and to a pressure chamber (17) inside the injector housing, from which, in Depending on the pressure in a control chamber (50), fuel subjected to high pressure is injected into a combustion chamber of an internal combustion engine when a nozzle needle (8) lifts off its seat (11), the pressure in the control chamber (50) being caused by a Actuator (56), in particular a piezo actuator, is directly controlled, characterized in that in the end of the nozzle needle (8) remote from the combustion chamber, a control chamber limiting sleeve (38) is movably received, through which the combustion chamber remote from the control chamber pressure is acted upon Face of the nozzle needle (8) is reduced.
2. Common-Rail-Injektor nach Anspruch 1, dadurch gekennzeichnet, dass der Außendurchmesser (40) der Steuerraumbegrenzungshülse (38) kleiner als der Außendurchmesser (12) der Düsennadel (8) im Bereich ihres Sitzes ist.2. Common rail injector according to claim 1, characterized in that the outer diameter (40) of the control space limiting sleeve (38) is smaller than the outer diameter (12) of the nozzle needle (8) in the region of its seat.
3. Common-Rail-Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an dem brennraumfernen Ende der Steuerraumbegrenzungshülse (38) insbesondere radial außen eine Beißkante (41) ausgebildet ist.3. Common rail injector according to one of the preceding claims, characterized in that at the combustion chamber distant end of the control space limiting sleeve (38), in particular a bite edge (41) is formed radially on the outside.
4. Common-Rail-Injektor nach Anspruch 3, dadurch gekennzeichnet, dass die Steuerraumbegrenzungshülse (38) ein zentrales Durchgangsloch (43) aufweist, das mit einem Leckölkanal (45,46) in Verbindung steht, der in dem Injektorgehäuse (1) ausgespart ist.4. Common rail injector according to claim 3, characterized in that the control space limiting sleeve (38) has a central through hole (43) which is connected to a leakage oil channel (45, 46) which is recessed in the injector housing (1) ,
5. Common-Rail-Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in dem brennraumfernen Ende der Düsennadel (8) ein Sackloch (33) ausgespart ist, das einen Führungsab- schnitt (37) aufweist, in welchem die Steuerraumbegrenzungshülse (38) in abdichtender Weise geführt ist.5. Common rail injector according to one of the preceding claims, characterized in that in the end of the nozzle needle (8) remote from the combustion chamber, a blind hole (33) is recessed, which has a guide section (37) in which the control space limiting sleeve (38 ) is performed in a sealing manner.
6. Common-Rail-Injektor nach Anspruch 5, dadurch gekennzeichnet, dass in dem Sackloch (33) eine Vorspannfeder (36) für die Steuerraumbegrenzungshülse (38) angeordnet ist.6. Common rail injector according to claim 5, characterized in that a biasing spring (36) for the control space limiting sleeve (38) is arranged in the blind hole (33).
7. Common-Rail-Injektor nach einem der vorhergehen- den Ansprüche, dadurch gekennzeichnet, dass der7. Common rail injector according to one of the preceding claims, characterized in that the
Steuerraum (50) radial außen durch eine weitere Steuerraumbegrenzungshülse (31) begrenzt ist, die an dem brennraumfernen Ende der Düsennadel (8) hin und her bewegbar geführt ist.Control space (50) is delimited radially on the outside by a further control space limiting sleeve (31), which is guided to move back and forth at the end of the nozzle needle (8) remote from the combustion chamber.
8. Common-Rail-Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Steuerraum (50) mit einem Aktordruckraum (55) in Verbindung steht, der in dem Injektorgehäuse (1) durch einen Piezoaktor (56) begrenzt wird. 8. Common rail injector according to one of the preceding claims, characterized in that the control chamber (50) with an actuator pressure chamber (55) in Connection is established, which is limited in the injector housing (1) by a piezo actuator (56).
EP05716732A 2004-04-20 2005-02-18 Common rail injector Not-in-force EP1740821B1 (en)

Applications Claiming Priority (2)

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DE102004018931A DE102004018931A1 (en) 2004-04-20 2004-04-20 Common rail injector
PCT/EP2005/050715 WO2005103479A1 (en) 2004-04-20 2005-02-18 Common rail injector

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EP1740821A1 true EP1740821A1 (en) 2007-01-10
EP1740821B1 EP1740821B1 (en) 2008-08-27

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US (1) US20070215116A1 (en)
EP (1) EP1740821B1 (en)
KR (1) KR20060134166A (en)
CN (1) CN100443711C (en)
AT (1) ATE406516T1 (en)
DE (2) DE102004018931A1 (en)
WO (1) WO2005103479A1 (en)

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US20150040867A1 (en) * 2012-03-16 2015-02-12 International Engine Intellectual Property Company, Llc Fuel injector needle sleeve
EP2674608B1 (en) * 2012-06-13 2015-08-12 Delphi International Operations Luxembourg S.à r.l. Fuel injector

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US4499878A (en) * 1982-10-25 1985-02-19 Nippon Soken, Inc. Fuel injection system for an internal combustion engine
US4535743A (en) * 1983-04-15 1985-08-20 Nippon Soken, Inc. Fuel injection apparatus for an internal combustion engine
JPS601369A (en) * 1983-06-16 1985-01-07 Nippon Soken Inc Fuel injection valve
JPH01187363A (en) * 1988-01-21 1989-07-26 Toyota Motor Corp Fuel injection valve for internal combustion engine
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DE502005005197D1 (en) 2008-10-09
EP1740821B1 (en) 2008-08-27
US20070215116A1 (en) 2007-09-20
CN100443711C (en) 2008-12-17
ATE406516T1 (en) 2008-09-15
KR20060134166A (en) 2006-12-27
CN1946931A (en) 2007-04-11
WO2005103479A1 (en) 2005-11-03
DE102004018931A1 (en) 2005-11-17

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