EP1907689B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP1907689B1
EP1907689B1 EP06762739A EP06762739A EP1907689B1 EP 1907689 B1 EP1907689 B1 EP 1907689B1 EP 06762739 A EP06762739 A EP 06762739A EP 06762739 A EP06762739 A EP 06762739A EP 1907689 B1 EP1907689 B1 EP 1907689B1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
filter
injector according
sleeve
fuel
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.)
Not-in-force
Application number
EP06762739A
Other languages
German (de)
French (fr)
Other versions
EP1907689A1 (en
Inventor
Ricardo Cadavid-Giraldo
Anton Kerckhoff
Stefan Kleiber
Hans-Joachim Koch
Wolfgang Scheibe
Ralph Wilding
Thomas Ziegler
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.)
LOrange GmbH
Original Assignee
LOrange GmbH
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Filing date
Publication date
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Publication of EP1907689A1 publication Critical patent/EP1907689A1/en
Application granted granted Critical
Publication of EP1907689B1 publication Critical patent/EP1907689B1/en
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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
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters
    • 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
    • F02M2200/90—Selection of particular materials
    • 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 fuel injector for injecting fuel stored in a fuel accumulator under high pressure into the combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • fuel injectors For injecting fuel, which is kept in a fuel tank under high pressure, in the combustion chamber of an internal combustion engine (common rail injection system) fuel injectors are known. Such fuel injectors typically have two hydraulic fluid paths. A main channel leads from the injector to the injection nozzle, a second channel branches off at a suitable location from the main channel and leads to a servo valve with which the control pressure of the control chamber is switched in the sense of opening and closing of the nozzle needle.
  • a main channel leads from the injector to the injection nozzle
  • a second channel branches off at a suitable location from the main channel and leads to a servo valve with which the control pressure of the control chamber is switched in the sense of opening and closing of the nozzle needle.
  • the fuel always contains particles up to a certain size. Therefore, in many known injectors on the input side filters or other construction elements are provided which retain particles above a harmful for the injector size.
  • control valves provided for controlling the injectors are intended to convert the supplied electrical control signal into a change of the control pressure as quickly as possible, the better the response of the valves, the better.
  • An increase in the switching speed is achieved inter alia by a reduction in the stroke of the valve actuator, which of course means that particles that are larger than the hub, can not pass through the valve gap and pinch in the valve gap and thereby interfere with the function of the valve.
  • the flow resistance increases with a correspondingly increasing deterioration of the hydraulic characteristics of the injector.
  • a fuel injector for injecting fuel stored in a fuel storage under high pressure fuel into the combustion chamber of an internal combustion engine is known, an injector, a longitudinally displaceably arranged in the nozzle needle and an injector nozzle to be opened by the nozzle needle through which the fuel into the combustion chamber of the Internal combustion engine is injectable contains.
  • a cooperating with the nozzle needle in the sense of an optional opening and closing of the injector, acted upon by the fuel pressure control chamber is limited by a bush surrounding the nozzle needle, which is flowed around by the supplied fuel and a leading to the control chamber inlet channel releases.
  • From the EP 0 957 262 A2 and from the DE 100 37 388 A1 are each arranged in the inlet to the control chamber of a fuel injector filter itself known.
  • the object of the invention is to provide an improved fuel injector of the type presumed.
  • a fuel injector is to be created, which against foreign particles contained in the supplied fuel is largely insensitive.
  • a fuel injector for internal combustion engines which has an axial bore through which fuel flows in a nozzle body, is created.
  • the bore receives a nozzle needle in the axially displaceable guided nozzle needle, which has at its one end a seat in the nozzle body, and carries at its other end a seated on the circumference of the nozzle needle, relative to the nozzle needle slidable sleeve.
  • the sleeve is adjacent, resiliently supported on the nozzle needle; in abutment against an axially adjacent to the nozzle body component of the fuel injector from a control chamber, which communicates via an inlet channel in the socket with the fuel-flow space on the outside of the socket in connection, and having a control valve controlled by a flow channel.
  • a filter for filtering the fuel flowing through the inlet channel to the control chamber is provided on the bushing.
  • a significant advantage of the invention is that the control circuit is reliably protected from particles of very small size, while the flow in the main channel to the injection nozzle, which is significantly less sensitive to larger particles, remains substantially unimpaired.
  • the filter is provided on the circumference of the bushing.
  • the filter surrounding the circumference of the sleeve is annular.
  • the filter is designed in the form of the lateral surface of a circular cylinder.
  • the bushing is formed with two sections of different circumferences and the filter is disposed on the smaller, recessed diameter of the bushing.
  • the bushing is retracted to the edge with respect to a section facing away from the control chamber, and the difference in diameter forms a radial step for the frontal contact of the filter.
  • the recessed diameter forms a filter receiving recess in the form of a circumferential annular groove with two radial steps.
  • a recess receiving the fuel stream passing through the filter is further formed on the bushing within the filter.
  • the recess is formed in the form of a circumferential annular groove.
  • the inlet channel leading to the control chamber contains an inflow throttle limiting the inflow.
  • the inlet channel leading to the control chamber contains an antechamber collecting the inflow.
  • the leading to the control chamber inlet channel is formed in the socket.
  • the supply channel leading to the control chamber is formed in the shaft of the nozzle needle.
  • the filter may be formed by a wire mesh filter or a wire mesh.
  • the filter may be formed by a fabric laminate.
  • the filter may be formed by a sintered material.
  • the filter may be formed by a gap filter.
  • the filter may be formed by a filter with holes, in particular circular, elliptical or polygonal holes.
  • the filter is attached to the socket by welding.
  • the filter is located in the fuel flow to be injected and is thereby self-cleaning.
  • FIG. 1 is a part of a fuel injector, which is provided for injecting fuel held in a fuel storage (common rail), not shown, under high pressure.
  • the fuel injector comprises an injector housing, which is shown only partially, with a nozzle body 7, in which a nozzle needle 6 is arranged so as to be longitudinally displaceable. This is in cooperation with a provided at its one end seat in the nozzle body 7 an injector 13 for injecting the fuel optionally free.
  • the fuel stored in the fuel accumulator under high pressure is supplied to the tip of the nozzle needle 6 in a ring-surrounding nozzle front chamber 14 via a formed in the nozzle body 7 extending bore 8 in the form of a high-pressure channel.
  • the nozzle needle 6 is guided longitudinally displaceably in the axial bore 8.
  • the nozzle needle 6 carries at its other end a seated on its periphery, relative to the nozzle needle 6 slidable bushing 1.
  • the bushing 1 is resiliently supported on the nozzle needle 6 and in abutment against an axially adjoining the nozzle body 7 component of the fuel injector from a control chamber 10 from which is connected via an inlet channel 2, 9 in the socket 1 with the fuel-flow space on the outside of the socket 1 in combination.
  • control chamber 10 is acted upon by the fuel supplied at high pressure and selectively depressurized by means of a control valve not shown in the figure via an outlet throttle 4 in the sense of opening the injector 13.
  • the control chamber 10 is circumferentially bounded by the nozzle needle 6 surrounding and tightly against this bushing 1, which is flowed around by the supplied via the high-pressure bore 8 fuel.
  • the bush 1 is the leading to the control chamber 10, an inlet throttle 2 containing inlet channel 2, 9 free.
  • a filter 3 for filtering the fuel to be supplied to the control chamber 10 is provided, which is annularly formed surrounding the circumference of the bushing 1 and has the shape of the lateral surface of a circular cylinder.
  • the outer periphery of the sleeve 1 is withdrawn to receive the filter 3.
  • the recessed diameter 11 forms a circumferential annular groove in which the filter 3 is located between two radial stages of the groove.
  • the recessed diameter 11 extends on a part of the bushing to the upper end of the bush 1, which has the mounting advantage that the filter 3 pushed from the top of the bushing 1 to the stop at a lower, formed by the diameter withdrawal, radial step can be.
  • the filter 3, preferably a wire mesh, can be formed separately from the socket 1 as a tissue cylinder.
  • the bushing 1 is spot-welded circumferentially with the tissue cylinder.
  • a through the filter 3 passing fuel flow receiving formed in the form of a circumferential annular groove 12 recess provided.
  • FIG. 3 is the opening into the control room inlet throttle 2 directed so that the mouth can not come to lie directly below the outlet throttle 4. Accordingly, the nozzle needle 6 is slightly withdrawn at the upper end in the scope.
  • the leading to the control chamber 10 inlet channel 2, 9 is formed in the socket 1.
  • the supply channel leading to the control chamber 10 may also be formed in the shaft of the nozzle needle 6.
  • the socket 1 would have a corresponding, the access to the inlet channel releasing recess.
  • the filter 3 may be formed by a cylindrical wire mesh or wire mesh having circumferentially and longitudinally extending wires.
  • the longitudinal, ie, extending coaxially to the bushing wires are thicker to ensure sufficient strength. So that the wires can not move, the wire mesh should be sintered.
  • the filter 3 may be formed by a fabric laminate or a sintered material.
  • the filter 3 may be formed by a slit filter or a filter having holes, in particular circular, elliptical or polygonal holes.
  • the filter 3 is self-cleaning. Due to the fuel flowing past in the high-pressure bore 8 on the outside of the filter 3 deposited particles are entrained there and in a manner not harmful to the fuel injector (and also for the internal combustion engine) by injection together with the fuel through the injector 13 into the combustion chamber of the internal combustion engine eliminated. Thus, a maintenance of the filter 3 is not required.

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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)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

At one of its ends, an injector needle (IN) (6) has a seating area in a nozzle/jet unit (7) and, at its other end, supports a bush (1) that sits on the IN's periphery and slides in relation to the IN. With springy support on the IN, the bush defines a control chamber (10) against a fuel injector's component linking on-axis to the nozzle/jet unit.

Description

Die Erfindung betrifft einen Kraftstoffinjektor zum Einspritzen von in einem Kraftstoffspeicher unter hohem Druck vorgehaltenem Kraftstoff in den Brennraum einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector for injecting fuel stored in a fuel accumulator under high pressure into the combustion chamber of an internal combustion engine according to the preamble of claim 1.

Zum Einspritzen von Kraftstoff, der in einem Kraftstoffspeicher unter hohem Druck vorgehalten ist, in den Brennraum einer Brennkraftmaschine (Common-Rail-Einspritzsystem) sind Kraftstoffinjektoren bekannt. Solche Kraftstoffinjektoren haben typischerweise zwei hydraulische Flüssigkeitswege. Ein Hauptkanal führt vom Injektoreingang zur Einspritzdüse, ein zweiter Kanal zweigt an geeigneter Stelle vom Hauptkanal ab und führt zu einem Servoventil, mit dem der Steuerdruck des Steuerraums im Sinne eines Öffnens und Schließens der Düsennadel geschaltet wird.For injecting fuel, which is kept in a fuel tank under high pressure, in the combustion chamber of an internal combustion engine (common rail injection system) fuel injectors are known. Such fuel injectors typically have two hydraulic fluid paths. A main channel leads from the injector to the injection nozzle, a second channel branches off at a suitable location from the main channel and leads to a servo valve with which the control pressure of the control chamber is switched in the sense of opening and closing of the nozzle needle.

Naturgemäß sind im Kraftstoff immer Partikel bis zu einer bestimmten Größe enthalten. Deshalb sind in vielen bekannten Injektoren eingangsseitig Filter oder andere Konstruktionselemente vorgesehen, die Partikel oberhalb einer für den Injektor schädlichen Größe zurückhalten.Naturally, the fuel always contains particles up to a certain size. Therefore, in many known injectors on the input side filters or other construction elements are provided which retain particles above a harmful for the injector size.

Die zur Steuerung der Injektoren vorgesehenen Steuerventile sollen das zugeführte elektrische Steuersignal so schnell wie möglich in eine Änderung des Steuerdrucks umsetzen, je schneller das Ansprechverhalten der Ventile, desto besser.The control valves provided for controlling the injectors are intended to convert the supplied electrical control signal into a change of the control pressure as quickly as possible, the better the response of the valves, the better.

Eine Steigerung der Schaltgeschwindigkeit wird unter anderem erreicht durch eine Verkleinerung des Hubes des Ventilstellgliedes, was natürlich bedeutet, dass Partikel, die größer sind als der Hub, durch den Ventilspalt nicht hindurchtreten können und sich in dem Ventilspalt einklemmen und dadurch die Funktion des Ventils stören.An increase in the switching speed is achieved inter alia by a reduction in the stroke of the valve actuator, which of course means that particles that are larger than the hub, can not pass through the valve gap and pinch in the valve gap and thereby interfere with the function of the valve.

Wenn die oben genannten eingangsseitigen Filter in Bezug auf die zulässige Partikelgröße weiter verfeinert werden, steigt zunehmend der Durchflusswiderstand mit entsprechend zunehmender Beeinträchtigung der hydraulischen Eigenschaften des Injektors.As the above-mentioned input side filters are further refined with respect to the allowable particle size, the flow resistance increases with a correspondingly increasing deterioration of the hydraulic characteristics of the injector.

Aus der WO 01/11222 A1 ist ein Kraftstoffinjektor zum Einspitzen von in einem Kraftstoffspeicher unter hohem Druck vorgehaltenem Kraftstoff in den Brennraum einer Brennkraftmaschine bekannt, der ein Injektorgehäuse, eine in dem Gehäuse längsverschieblich angeordnete Düsennadel und eine von der Düsennadel wahlweise zu öffnende Einspritzdüse, durch die der Kraftstoff in den Brennraum der Brennkraftmaschine einspritzbar ist, enthält. Ein mit der Düsennadel im Sinne eines wahlweisen Öffnens und Schließens der Einspritzdüse zusammenwirkender, vom Kraftstoffdruck beaufschlagter Steuerraum ist durch eine die Düsennadel umgebende Buchse begrenzt, die von dem zugeführten Kraftstoff umströmt wird und einen zum Steuerraum führenden Zulaufkanal freigibt. Aus der EP 0 957 262 A2 und aus der DE 100 37 388 A1 sind jeweils im Zulauf zur Steuerkammer eines Kraftstoffinjektors angeordnete Filter an sich bekannt.From the WO 01/11222 A1 a fuel injector for injecting fuel stored in a fuel storage under high pressure fuel into the combustion chamber of an internal combustion engine is known, an injector, a longitudinally displaceably arranged in the nozzle needle and an injector nozzle to be opened by the nozzle needle through which the fuel into the combustion chamber of the Internal combustion engine is injectable contains. A cooperating with the nozzle needle in the sense of an optional opening and closing of the injector, acted upon by the fuel pressure control chamber is limited by a bush surrounding the nozzle needle, which is flowed around by the supplied fuel and a leading to the control chamber inlet channel releases. From the EP 0 957 262 A2 and from the DE 100 37 388 A1 are each arranged in the inlet to the control chamber of a fuel injector filter itself known.

Die Aufgabe der Erfindung ist es einen verbesserten Kraftstoffinjektor der vorausgesetzten Art zu schaffen. Insbesondere soll ein Kraftstoffinjektor geschaffen werden, welcher gegen in dem zugeführten Kraftstoff enthaltene Fremdkörperpartikel weitestgehend unempfindlich ist.The object of the invention is to provide an improved fuel injector of the type presumed. In particular, a fuel injector is to be created, which against foreign particles contained in the supplied fuel is largely insensitive.

Die Aufgabe wird durch einen Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 gelöst.The object is achieved by a fuel injector with the features of claim 1.

Vorteilhafte Weiterbildungen und Ausführungsformen des erfindungsgemäßen Kraftstoffinjektors sind in den Unteransprüchen angegeben.Advantageous developments and embodiments of the fuel injector according to the invention are specified in the subclaims.

Durch die Erfindung wird ein Kraftstoffinjektor für Brennkraftmaschinen, der in einem Düsenkörper eine axiale, vom Kraftstoff durchströmte Bohrung aufweist, geschaffen. Die Bohrung nimmt eine im Düsenkörper axial verschieblich geführte Düsennadel auf, die an ihrem einen Ende eine Sitzfläche im Düsenkörper besitzt, und die an ihrem anderen Ende eine auf dem Umfang der Düsennadel aufsitzende, relativ zur Düsennadel verschiebliche Buchse trägt. Die Buchse grenzt, federnd an der Düsennadel abgestützt; in Anlage gegen ein axial an den Düsenkörper anschließendes Bauteil des Kraftstoffinjektors einen Steuerraum ab, der über einen Zulaufkanal in der Buchse mit dem kraftstoffumströmten Raum auf der Außenseite der Buchse in Verbindung steht, und der einen von einem Steuerventil gesteuerten Ablaufkanal aufweist. Erfindungsgemäß ist an der Buchse ein Filter zur Filterung des über den Zulaufkanal zum Steuerraum strömenden Kraftstoffs vorgesehen.By means of the invention, a fuel injector for internal combustion engines, which has an axial bore through which fuel flows in a nozzle body, is created. The bore receives a nozzle needle in the axially displaceable guided nozzle needle, which has at its one end a seat in the nozzle body, and carries at its other end a seated on the circumference of the nozzle needle, relative to the nozzle needle slidable sleeve. The sleeve is adjacent, resiliently supported on the nozzle needle; in abutment against an axially adjacent to the nozzle body component of the fuel injector from a control chamber, which communicates via an inlet channel in the socket with the fuel-flow space on the outside of the socket in connection, and having a control valve controlled by a flow channel. According to the invention, a filter for filtering the fuel flowing through the inlet channel to the control chamber is provided on the bushing.

Ein wesentlicher Vorteil der Erfindung ist es, dass der Steuerkreis zuverlässig vor Partikeln auch sehr geringer Größe geschützt wird, während die Strömung im Hauptkanal zur Einspritzdüse, die gegen größere Partikel deutlich weniger empfindlich ist, im wesentlichen unbeeinträchtigt bleibt.A significant advantage of the invention is that the control circuit is reliably protected from particles of very small size, while the flow in the main channel to the injection nozzle, which is significantly less sensitive to larger particles, remains substantially unimpaired.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Filter am Umfang der Buchse vorgesehen.According to a preferred embodiment of the invention, the filter is provided on the circumference of the bushing.

Vorzugsweise ist der Filter den Umfang der Buchse umgebend ringförmig ausgebildet.Preferably, the filter surrounding the circumference of the sleeve is annular.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Filter in Form der Mantelfläche eines Kreiszylinders ausgebildet.According to a preferred embodiment of the invention, the filter is designed in the form of the lateral surface of a circular cylinder.

Zweckmäßigerweise ist die Buchse mit zwei Abschnitten mit unterschiedlichen Umfängen ausgebildet und der Filter ist auf dem kleineren, im Umfang zurückgenommenen Durchmesser der Buchse angeordnet.Conveniently, the bushing is formed with two sections of different circumferences and the filter is disposed on the smaller, recessed diameter of the bushing.

Vorzugsweise ist die Buchse im Bereich eines steueraumseitigen Abschnitts bis zum Rand gegenüber einem steuerraumabgewandten Abschnitt im Durchmesser zurückgenommen und der Durchmesserunterschied bildet eine radiale Stufe für die stirnseitige Anlage des Filters.Preferably, in the region of a control-chamber-side section, the bushing is retracted to the edge with respect to a section facing away from the control chamber, and the difference in diameter forms a radial step for the frontal contact of the filter.

Vorzugsweise bildet der zurückgenommene Durchmesser eine den Filter aufnehmende Ausnehmung in Form einer umlaufenden ringförmigen Nut mit zwei radialen Stufen.Preferably, the recessed diameter forms a filter receiving recess in the form of a circumferential annular groove with two radial steps.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist an der Buchse innerhalb des Filters weiterhin eine den durch den Filter hindurchtretenden Kraftstoffstrom aufnehmende Ausnehmung ausgebildet.According to a preferred embodiment of the invention, a recess receiving the fuel stream passing through the filter is further formed on the bushing within the filter.

Vorzugsweise ist die Ausnehmung in Form einer umlaufenden ringförmigen Nut ausgebildet.Preferably, the recess is formed in the form of a circumferential annular groove.

Vorzugsweise enthält der zum Steuerraum führende Zulaufkanal eine den Zustrom begrenzende Zulaufdrossel.Preferably, the inlet channel leading to the control chamber contains an inflow throttle limiting the inflow.

Gemäß einer bevorzugten Ausführungsform der Erfindung enthält der zum Steuerraum führende Zulaufkanal eine den Zustrom sammelnde Vorkammer.According to a preferred embodiment of the invention, the inlet channel leading to the control chamber contains an antechamber collecting the inflow.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist der zum Steuerraum führende Zulaufkanal in der Buchse ausgebildet.According to a preferred embodiment of the invention, the leading to the control chamber inlet channel is formed in the socket.

Gemäß einer anderen Ausführungsform der Erfindung ist der zum Steuerraum führende Zulaufkanal im Schaft der Düsennadel ausgebildet.According to another embodiment of the invention, the supply channel leading to the control chamber is formed in the shaft of the nozzle needle.

Der Filter kann durch ein Drahtgewebefilter oder ein Drahtgeflecht gebildet sein.The filter may be formed by a wire mesh filter or a wire mesh.

Der Filter kann durch ein Gewebelaminat gebildet sein.The filter may be formed by a fabric laminate.

Der Filter kann durch einen Sinterwerkstoff gebildet sein.The filter may be formed by a sintered material.

Der Filter kann durch ein Spaltfilter gebildet sein.The filter may be formed by a gap filter.

Der Filter kann durch ein Filter mit Löchern, insbesondere kreis-, ellipsen- oder polygonförmigen Löchern, gebildet sein.The filter may be formed by a filter with holes, in particular circular, elliptical or polygonal holes.

Vorzugsweise ist der Filter durch Schweißen an der Buchse befestigt.Preferably, the filter is attached to the socket by welding.

Gemäß einer bevorzugten Ausführungsform der Erfindung liegt der Filter im einzuspritzenden Kraftstoffstrom und ist dadurch selbstreinigend.According to a preferred embodiment of the invention, the filter is located in the fuel flow to be injected and is thereby self-cleaning.

Im folgenden wird ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffinjektors anhand der Zeichnung erläutert.In the following an embodiment of the fuel injector according to the invention will be explained with reference to the drawing.

Es zeigen:

  • Figur 1 eine teilweise Querschnittsdarstellung eines Kraftstoffinjektors gemäß einem ersten Ausführungsbeispiel der Erfindung;
  • Figur 2 eine Ansicht eines Details A aus Figur 1 und
  • Figur 3 eine Ausführungsvariante in einer Detailansicht entsprechend Figur 2.
Show it:
  • FIG. 1 a partial cross-sectional view of a fuel injector according to a first embodiment of the invention;
  • FIG. 2 a view of a detail A from FIG. 1 and
  • FIG. 3 a variant in a detailed view accordingly FIG. 2 ,

In Figur 1 ist ein Teil eines Kraftstoffinjektors dargestellt, der zum Einspritzen von in einem nicht gezeigten Kraftstoffspeicher (Common-Rail) unter hohem Druck vorgehaltenem Kraftstoff vorgesehen ist. Der Kraftstoffinjektor umfasst ein nur teilweise dargestelltes Injektorgehäuse mit einem Düsenkörper 7, worin eine Düsennadel 6 längsverschieblich geführt angeordnet ist. Diese gibt unter Zusammenwirken mit einer an ihrem einen Ende vorgesehenen Sitzfläche im Düsenkörper 7 eine Einspritzdüse 13 zum Einspritzen des Kraftstoffs wahlweise frei. Der in dem Kraftstoffspeicher unter hohem Druck vorgehaltene Kraftstoff ist über einen in Form einer axial in dem Düsenkörper 7 verlaufenden Bohrung ausgebildeten Hochdruckkanal 8 einem die Spitze der Düsennadel 6 ringförmig umgebenden Düsenvorraum 14 zuführbar. Die Düsennadel 6 ist in der axialen Bohrung 8 längsverschieblich geführt.In FIG. 1 is a part of a fuel injector, which is provided for injecting fuel held in a fuel storage (common rail), not shown, under high pressure. The fuel injector comprises an injector housing, which is shown only partially, with a nozzle body 7, in which a nozzle needle 6 is arranged so as to be longitudinally displaceable. This is in cooperation with a provided at its one end seat in the nozzle body 7 an injector 13 for injecting the fuel optionally free. The fuel stored in the fuel accumulator under high pressure is supplied to the tip of the nozzle needle 6 in a ring-surrounding nozzle front chamber 14 via a formed in the nozzle body 7 extending bore 8 in the form of a high-pressure channel. The nozzle needle 6 is guided longitudinally displaceably in the axial bore 8.

Die Düsennadel 6 trägt an ihrem anderen Ende eine auf ihrem Umfang aufsitzende, relativ zur Düsennadel 6 verschiebliche Buchse 1. Die Buchse 1 ist federnd an der Düsennadel 6 abgestützt und grenzt in Anlage gegen ein axial an den Düsenkörper 7 anschließendes Bauteil des Kraftstoffinjektors einen Steuerraum 10 ab, der über einen Zulaufkanal 2, 9 in der Buchse 1 mit dem kraftstoffumströmten Raum auf der Außenseite der Buchse 1 in Verbindung steht.The nozzle needle 6 carries at its other end a seated on its periphery, relative to the nozzle needle 6 slidable bushing 1. The bushing 1 is resiliently supported on the nozzle needle 6 and in abutment against an axially adjoining the nozzle body 7 component of the fuel injector from a control chamber 10 from which is connected via an inlet channel 2, 9 in the socket 1 with the fuel-flow space on the outside of the socket 1 in combination.

Der Steuerraum 10 ist von dem unter hohem Druck zugeführten Kraftstoff beaufschlagt und mittels eines in der Figur nicht gezeigten Steuerventils über eine Ablaufdrossel 4 im Sinne eines Öffnens der Einspritzdüse 13 wahlweise druckentlastbar.The control chamber 10 is acted upon by the fuel supplied at high pressure and selectively depressurized by means of a control valve not shown in the figure via an outlet throttle 4 in the sense of opening the injector 13.

Wie Figur 1 und insbesondere die in den Figuren 2 und 3 dargestellten vergrößerten Detaildarstellungen zweier Ausführungsvarianten zeigen, ist der Steuerraum 10 umfangsmäßig durch die die Düsennadel 6 umgebende und dicht an dieser anliegende Buchse 1 begrenzt, die von dem über die Hochdruckbohrung 8 zugeführten Kraftstoff umströmt wird. Die Buchse 1 gibt den zum Steuerraum 10 führenden, eine Zulaufdrossel 2 enthaltenden Zulaufkanal 2, 9 frei.As FIG. 1 and especially those in the FIGS. 2 and 3 shown enlarged detail representations of two embodiments, the control chamber 10 is circumferentially bounded by the nozzle needle 6 surrounding and tightly against this bushing 1, which is flowed around by the supplied via the high-pressure bore 8 fuel. The bush 1 is the leading to the control chamber 10, an inlet throttle 2 containing inlet channel 2, 9 free.

An der Buchse 1 ist ein Filter 3 zur Filterung des zum Steuerraum 10 zuzuführenden Kraftstoffs vorgesehen, der den Umfang der Buchse 1 umgebend ringförmig ausgebildet ist und die Form der Mantelfläche eines Kreiszylinders hat. Der äußere Umfang der Buchse 1 ist zur Aufnahme des Filters 3 zurückgenommen. Gemäß Figur 2 bildet der zurückgenommene Durchmesser 11 eine umlaufende ringförmige Nut, in der der Filter 3 zwischen zwei radialen Stufen der Nut liegt. Gemäß Figur 3 erstreckt sich der zurückgenommene Durchmesser 11 auf einem Teil der Buchse bis zum oberen Ende der Buchse 1, was den montagemäßigen Vorteil hat, dass der Filter 3 von oben auf die Buchse 1 bis zum Anschlag an einer unteren, durch die Durchmesserzurücknahme gebildeten, radialen Stufe geschoben werden kann. Der Filter 3, vorzugsweise ein Drahtgewebe, kann separat von der Buchse 1 als Gewebezylinder geformt werden. Die Buchse 1 wird mit dem Gewebezylinder umlaufend punktverschweißt.At the socket 1, a filter 3 for filtering the fuel to be supplied to the control chamber 10 is provided, which is annularly formed surrounding the circumference of the bushing 1 and has the shape of the lateral surface of a circular cylinder. The outer periphery of the sleeve 1 is withdrawn to receive the filter 3. According to FIG. 2 the recessed diameter 11 forms a circumferential annular groove in which the filter 3 is located between two radial stages of the groove. According to FIG. 3 the recessed diameter 11 extends on a part of the bushing to the upper end of the bush 1, which has the mounting advantage that the filter 3 pushed from the top of the bushing 1 to the stop at a lower, formed by the diameter withdrawal, radial step can be. The filter 3, preferably a wire mesh, can be formed separately from the socket 1 as a tissue cylinder. The bushing 1 is spot-welded circumferentially with the tissue cylinder.

Weiterhin ist an der Buchse 1 innerhalb des Filters 3 und im Bereich des zurückgenommenen Durchmessers 11 eine den durch den Filter 3 hindurchtretenden Kraftstoffstrom aufnehmende, in Form einer umlaufenden ringförmigen Nut 12 ausgebildete Ausnehmung vorgesehen.Furthermore, on the sleeve 1 within the filter 3 and in the region of the withdrawn diameter 11, a through the filter 3 passing fuel flow receiving, formed in the form of a circumferential annular groove 12 recess provided.

Der zum Steuerraum 10 führende Zulaufkanal enthält die bereits vorher genannte, den Zustrom begrenzende Zulaufdrossel 2, sowie eine den Zustrom sammelnde Vorkammer 9 am Übergang von der Nut 12 zur Zulaufdrossel 2. Gemäß Figur 3 ist die in den Steuerraum mündende Zulaufdrossel 2 so gerichtet, dass die Mündung nicht direkt unterhalb der Ablaufdrossel 4 zu liegen kommen kann. Entsprechend ist die Düsennadel 6 am oberen Ende im Umfang etwas zurückgenommen.The inlet channel leading to the control chamber 10 contains the previously mentioned inflow restrictor 2 delimiting the inflow, and an antechamber 9 collecting the inflow at the transition from the groove 12 to the inflow throttle 2 FIG. 3 is the opening into the control room inlet throttle 2 directed so that the mouth can not come to lie directly below the outlet throttle 4. Accordingly, the nozzle needle 6 is slightly withdrawn at the upper end in the scope.

Bei den dargestellten Ausführungsbeispielen ist der zum Steuerraum 10 führende Zulaufkanal 2, 9 in der Buchse 1 ausgebildet. Alternativ kann der zum Steuerraum 10 führende Zulaufkanal auch im Schaft der Düsennadel 6 ausgebildet sein. In diesem Falle müsste die Buchse 1 eine entsprechende, den Zugang zu dem Zulaufkanal freigebende Ausnehmung aufweisen.In the illustrated embodiments, the leading to the control chamber 10 inlet channel 2, 9 is formed in the socket 1. Alternatively, the supply channel leading to the control chamber 10 may also be formed in the shaft of the nozzle needle 6. In this case, the socket 1 would have a corresponding, the access to the inlet channel releasing recess.

Der Filter 3 kann durch ein zylindrisches Drahtgewebe oder Drahtgeflecht mit in Umfangsrichtung und in Längsrichtung verlaufenden Drähten gebildet sein. Vorzugsweise sind die längs, d.h., koaxial zur Buchse verlaufenden Drähte dicker, um eine ausreichende Festigkeit zu gewährleisten. Damit die Drähte sich nicht verschieben können, soll das Drahtgewebe gesintert sein. Alternativ kann der Filter 3 durch ein Gewebelaminat oder einen Sinterwerkstoff gebildet sein. Gemäß noch anderen alternativen Ausführungsformen kann der Filter 3 durch einen Spaltfilter oder einen Filter mit Löchern, insbesondere kreis-, ellipsen- oder polygonförmigen Löchern, gebildet sein.The filter 3 may be formed by a cylindrical wire mesh or wire mesh having circumferentially and longitudinally extending wires. Preferably, the longitudinal, ie, extending coaxially to the bushing wires are thicker to ensure sufficient strength. So that the wires can not move, the wire mesh should be sintered. Alternatively, the filter 3 may be formed by a fabric laminate or a sintered material. According to In yet other alternative embodiments, the filter 3 may be formed by a slit filter or a filter having holes, in particular circular, elliptical or polygonal holes.

Der Filter 3 ist selbstreinigend. Durch den in der Hochdruckbohrung 8 an der Außenseite des Filters 3 vorbeiströmenden Kraftstoff werden dort abgelagerte Partikel mitgerissen und in einer für den Kraftstoffinjektor (und auch für die Brennkraftmaschine) nicht schädlichen Weise durch Einspritzen zusammen mit dem Kraftstoff durch die Einspritzdüse 13 in den Brennraum der Brennkraftmaschine beseitigt. Somit ist eine Wartung des Filters 3 nicht erforderlich.The filter 3 is self-cleaning. Due to the fuel flowing past in the high-pressure bore 8 on the outside of the filter 3 deposited particles are entrained there and in a manner not harmful to the fuel injector (and also for the internal combustion engine) by injection together with the fuel through the injector 13 into the combustion chamber of the internal combustion engine eliminated. Thus, a maintenance of the filter 3 is not required.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
BuchseRifle
22
Zulaufdrosselinlet throttle
33
Filterfilter
44
Ablaufdrosseloutlet throttle
55
Federfeather
66
Düsennadelnozzle needle
77
Injektorgehäuse, DüsenkörperInjector housing, nozzle body
88th
Hochdruckkanal, axiale BohrungHigh pressure channel, axial bore
99
Vorkammerantechamber
1010
Steuerraumcontrol room
1111
zurückgenommener Durchmesserwithdrawn diameter
1212
Nutgroove
1313
Einspritzdüseinjection
1414
Düsenvorraumnozzle antechamber

Claims (21)

  1. Fuel injector for internal combustion engines, which fuel injector has, in a nozzle body (7), an axial bore (8) which is traversed by the fuel to be injected and which holds a nozzle needle (6), which nozzle needle (6) is guided in an axially movable manner in the nozzle body (7) and, at its one end, has a seat surface in the nozzle body and, at its other end, supports a sleeve (1), which sleeve (1) is seated on the periphery of the nozzle needle (6) and is axially movable relative to the nozzle needle (6) and, while being resiliently supported on the nozzle needle (6), when said sleeve (1) is in contact against a fuel injector component which axially adjoins the nozzle body (7), said sleeve (1) delimits a control chamber (10) which is connected via a supply duct (2, 9) in the sleeve (1) to the chamber, around which fuel flows, on the outer side of the sleeve (1), which control chamber (10) has a discharge duct (4) which is controlled by a control valve,
    characterized
    in that a filter (3) for filtering the fuel flowing via the supply duct (2, 9) to the control chamber (10) is provided on the sleeve (1).
  2. Fuel injector according to Claim 1,
    characterized
    in that the filter (3) is provided on the periphery of the sleeve (1).
  3. Fuel injector according to Claim 2,
    characterized
    in that the filter (3) is formed annularly so as to surround the periphery of the sleeve (1).
  4. Fuel injector according to Claim 3,
    characterized
    in that the filter (3) is formed in the shape of the lateral surface of a circular cylinder.
  5. Fuel injector according to Claim 1, 2, 3 or 4,
    characterized
    in that the sleeve (1) has two sections with different peripheries, and in that the filter (3) is arranged on the relatively small diameter (11), which is recessed in terms of its periphery, of the sleeve (1).
  6. Fuel injector according to Claim 5,
    characterized
    in that the sleeve (1) is recessed in terms of diameter in the region of a control-chamber-side section up to the edge opposite a section which faces away from the control chamber, and in that the diameter difference forms a radial step for the end-side abutment of the filter (3).
  7. Fuel injector according to Claim 5,
    characterized
    in that the recessed diameter (11) forms a recess, which holds the filter (3), in the form of an encircling annular groove with two radial steps.
  8. Fuel injector according to one of Claims 1 to 7,
    characterized
    in that a recess (12) which receives the fuel flow passing through the filter (3) is formed on the sleeve (1) within the filter (3) and in the region of the recessed diameter (11).
  9. Fuel injector according to Claim 8,
    characterized
    in that the recess (12) is formed in the manner of an encircling annular groove.
  10. Fuel injector according to one of Claims 1 to 9,
    characterized
    in that the supply duct (2, 9) which leads to the control chamber (10) contains a supply throttle (2) which delimits the supply flow.
  11. Fuel injector according to one of Claims 1 to 10,
    characterized
    in that the supply duct (2, 9) which leads to the control chamber (10) contains a pre-chamber (9) which accumulates the supply flow.
  12. Fuel injector according to one of Claims 1 to 11,
    characterized
    in that the supply duct (2, 9) which leads to the control chamber (10) is formed in the sleeve (1).
  13. Fuel injector according to one of Claims 1 to 12,
    characterized
    in that the supply duct (2, 9) which leads to the control chamber (10) is formed in the shank of the nozzle needle (6).
  14. Fuel injector according to one of Claims 1 to 13,
    characterized
    in that the filter (3) is formed by a wire cloth or a wire mesh.
  15. Fuel injector according to Claim 14,
    characterized
    in that the wire cloth or wire mesh is sintered.
  16. Fuel injector according to one of Claims 1 to 13,
    characterized
    in that the filter (3) is formed by a fabric-based laminate.
  17. Fuel injector according to one of Claims 1 to 13,
    characterized
    in that the filter (3) is formed by a sintered material.
  18. Fuel injector according to one of Claims 1 to 13,
    characterized
    in that the filter (3) is formed by a gap filter.
  19. Fuel injector according to one of Claims 1 to 13,
    characterized
    in that the filter (3) is formed by a filter with circular, elliptical or polygonal holes.
  20. Fuel injector according to one of Claims 14 to 19,
    characterized
    in that the filter (3) is fastened to the sleeve (1) by welding.
  21. Fuel injector according to one of Claims 1 to 20,
    characterized
    in that the filter (3) is arranged in the fuel flow to be injected, and is thereby self-cleaning.
EP06762739A 2005-07-28 2006-07-21 Fuel injector Not-in-force EP1907689B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005035347A DE102005035347B3 (en) 2005-07-28 2005-07-28 Fuel injector for an internal combustion engine has an axial hole for fuel in a nozzle/jet unit with an injector needle sliding on-axis in the nozzle/jet unit
PCT/EP2006/007187 WO2007012433A1 (en) 2005-07-28 2006-07-21 Fuel injector

Publications (2)

Publication Number Publication Date
EP1907689A1 EP1907689A1 (en) 2008-04-09
EP1907689B1 true EP1907689B1 (en) 2009-03-25

Family

ID=36709981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06762739A Not-in-force EP1907689B1 (en) 2005-07-28 2006-07-21 Fuel injector

Country Status (6)

Country Link
EP (1) EP1907689B1 (en)
JP (1) JP4869345B2 (en)
KR (1) KR101029214B1 (en)
AT (1) ATE426741T1 (en)
DE (2) DE102005035347B3 (en)
WO (1) WO2007012433A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011016168A1 (en) 2011-04-05 2012-10-11 L'orange Gmbh Fuel injector for internal combustion engine, has nozzle body, within which valve needle of valve of fuel injector is longitudinal displaceably received, where valve partner is formed in form of valve seat of valve
WO2020040931A1 (en) * 2018-08-21 2020-02-27 Tenneco Automotive Operating Company Inc. Injector fluid filter with upper and lower lip seal

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
WO2008046238A2 (en) * 2006-10-16 2008-04-24 Ganser-Hydromag Ag Fuel injection valve for internal combustion engines
DE102007029793A1 (en) 2007-06-27 2008-07-17 L'orange Gmbh Fuel injector for internal combustion engines, has high pressure area extending in axial direction and allows injecting fuel staying below high pressure
DE102008041730A1 (en) * 2008-09-01 2010-03-04 Robert Bosch Gmbh Injector with a particle filter arranged in front of the inlet throttle
CN101592106B (en) * 2009-04-24 2013-10-30 靳北彪 Apertured valve sheet deformation fuel injector for engine
DE102011053113B4 (en) 2011-08-30 2017-06-29 L'orange Gmbh Filter arrangement, in particular for fuel injectors
DE102011086339A1 (en) * 2011-11-15 2013-05-16 Robert Bosch Gmbh Fuel injector, in particular common rail injector
US9644589B2 (en) * 2013-11-20 2017-05-09 Stanadyne Llc Debris diverter shield for fuel injector
EP2940287A1 (en) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Fuel injector filter
EP2940286A1 (en) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Fuel injector filter
FR3051229B1 (en) * 2016-05-13 2021-02-19 Delphi Int Operations Luxembourg Sarl FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINE
CN106762289A (en) * 2017-01-18 2017-05-31 哈尔滨工程大学 Pressure accumulation orifice-plate type electric-controlled fuel injector
CN106593722A (en) * 2017-01-18 2017-04-26 哈尔滨工程大学 Resonance hole-plate type electronic control fuel injector with carved grooves
DE102018221604A1 (en) * 2018-12-13 2020-06-18 Robert Bosch Gmbh Fuel injector

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JP3303373B2 (en) * 1992-12-09 2002-07-22 株式会社デンソー Fuel injection device
GB9810208D0 (en) * 1998-05-13 1998-07-08 Lucas Ind Plc Fuel injector
DE19936668A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
DE10037388A1 (en) * 2000-08-01 2002-02-21 Bosch Gmbh Robert Valve arrangement, in particular for a fuel injection system of an internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011016168A1 (en) 2011-04-05 2012-10-11 L'orange Gmbh Fuel injector for internal combustion engine, has nozzle body, within which valve needle of valve of fuel injector is longitudinal displaceably received, where valve partner is formed in form of valve seat of valve
DE102011016168B4 (en) * 2011-04-05 2015-02-12 L'orange Gmbh Fuel injector for an internal combustion engine
WO2020040931A1 (en) * 2018-08-21 2020-02-27 Tenneco Automotive Operating Company Inc. Injector fluid filter with upper and lower lip seal
US10704444B2 (en) 2018-08-21 2020-07-07 Tenneco Automotive Operating Company Inc. Injector fluid filter with upper and lower lip seal

Also Published As

Publication number Publication date
JP4869345B2 (en) 2012-02-08
DE502006003278D1 (en) 2009-05-07
JP2009503325A (en) 2009-01-29
KR20080034908A (en) 2008-04-22
KR101029214B1 (en) 2011-04-12
ATE426741T1 (en) 2009-04-15
DE102005035347B3 (en) 2006-08-10
EP1907689A1 (en) 2008-04-09
WO2007012433A1 (en) 2007-02-01

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