EP1907689A1 - Fuel injector - Google Patents

Fuel injector

Info

Publication number
EP1907689A1
EP1907689A1 EP06762739A EP06762739A EP1907689A1 EP 1907689 A1 EP1907689 A1 EP 1907689A1 EP 06762739 A EP06762739 A EP 06762739A EP 06762739 A EP06762739 A EP 06762739A EP 1907689 A1 EP1907689 A1 EP 1907689A1
Authority
EP
European Patent Office
Prior art keywords
filter
fuel injector
injector according
fuel
bushing
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
EP06762739A
Other languages
German (de)
French (fr)
Other versions
EP1907689B1 (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
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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP1907689A1 publication Critical patent/EP1907689A1/en
Application granted granted Critical
Publication of EP1907689B1 publication Critical patent/EP1907689B1/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
    • 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 in a fuel storage under high pressure held fuel into the combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • 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 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.
  • 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.
  • 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.
  • WO 01/11222 A1 discloses a fuel injector for injecting fuel stored in a fuel reservoir under high pressure into the combustion chamber of an internal combustion engine, comprising an injector housing, a nozzle needle arranged to be longitudinally displaceable in the housing and an injection nozzle which can be optionally opened by the nozzle needle. by the fuel in the combustion chamber of the internal combustion engine can be injected bar contains.
  • a control chamber which cooperates with the nozzle needle in the sense of an optional opening and closing of the injection nozzle and is acted upon by the fuel pressure, is delimited by a bush surrounding the nozzle needle, which is surrounded by the supplied fuel and releases an inlet channel leading to the control chamber. From EP 0957262 A2 and DE 100 37 388 Al each filter arranged in the inlet to the control chamber of a Kraftstoffinj are known per se.
  • the object of the invention is to provide an improved fuel injector of the presumed kind.
  • a fuel injector is to be created which rather, is largely insensitive to foreign body particles contained in the fuel supplied.
  • the object is achieved by a fuel injector with the shopping ⁇ paint of claim 1.
  • the invention provides a fuel injector for internal combustion engines, which has in a nozzle body an axial, flowed through by the fuel bore.
  • 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 displaceable sleeve.
  • the sleeve is adjacent, resiliently supported on the nozzle needle, in abutment against an axially adjacent to the nozzle body component of Kraftstoffinj ector a control chamber from which is connected via an inlet channel in the socket with the fuel-flow space on the outside of the socket in conjunction, and the one Having controlled by a control valve drain channel.
  • a filter is provided on the bushing for filtering the fuel flowing through the inlet channel to the control chamber.
  • 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 sleeve is formed with two sections with different circumferences and the filter is disposed on the smaller, recessed diameter of the bushing.
  • the bushing in the region of a control-end-side section is retracted to the edge in relation to a section facing away from the control space, and the difference in diameter forms a radial step for the end-face 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 flow passing through the filter is also 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 Kraftstoffström injected and thus is self-cleaning.
  • the fuel injector according to the invention will be explained with reference to the drawing.
  • Figure 1 is a partial cross-sectional view of a fuel injector according to a first embodiment of the invention
  • Figure 2 is a view of a detail A of Figure 1 and
  • FIG. 3 shows a variant embodiment in a detail view corresponding to FIG. 2.
  • FIG. 1 shows a part of a fuel injector which is provided for injecting fuel stored under high pressure in a fuel accumulator (common rail), not shown.
  • 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 to be guided in a longitudinally displaceable manner. 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 reservoir under high pressure is supplied to the tip of the nozzle needle 6 in a ring-shaped surrounding nozzle leading chamber 14 via a in the form of an axially extending in the nozzle body 7 bore 8 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 on the nozzle needle 6 till- supports and abuts in plant against an axially adjacent to the Düsenkör ⁇ per 7 component of Kraftstoffinj 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 conjunction.
  • 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.
  • control chamber 10 is bounded circumferentially by the bush 1 surrounding the nozzle needle 6 and tightly against it, which is surrounded by the fuel supplied via the high-pressure bore 8 ,
  • 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 withdrawn diameter 11 extends on a part of the sleeve to the upper end of the bushing 1, which has the mounting advantage that the filter 3 from above on the bushing 1 until it stops at a lower, formed by the diameter withdrawal, Radial stage can be pushed.
  • 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 recess which passes through the filter 3 and receives a fuel flow formed in the form of a circumferential annular groove 12 is provided.
  • 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.
  • the inflow throttle 2 opening into the control chamber is directed such 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.

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

KRAFTSTOFFINJEKTOR FUEL INJECTOR
Die Erfindung betrifft einen Kraftstoffinj ektor 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 in a fuel storage under high pressure held fuel 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 Kraftstoffinj ektoren bekannt. Solche Kraftstoffinj ektoren 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 storage under high pressure, in the combustion chamber of an internal combustion engine (common-rail injection system) Kraftstoffinj are known ectors. 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 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. 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.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. 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 Al ist ein Kraftstoffinj ektor zum Einspritzen 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 einspritz- bar ist, enthält. Ein mit der Düsennadel im Sinne eines wahl- weisen 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 Al sind jeweils im Zulauf zur Steuerkammer eines Kraftstoffinj ektors angeordnete Filter an sich bekannt .WO 01/11222 A1 discloses a fuel injector for injecting fuel stored in a fuel reservoir under high pressure into the combustion chamber of an internal combustion engine, comprising an injector housing, a nozzle needle arranged to be longitudinally displaceable in the housing and an injection nozzle which can be optionally opened by the nozzle needle. by the fuel in the combustion chamber of the internal combustion engine can be injected bar contains. A control chamber, which cooperates with the nozzle needle in the sense of an optional opening and closing of the injection nozzle and is acted upon by the fuel pressure, is delimited by a bush surrounding the nozzle needle, which is surrounded by the supplied fuel and releases an inlet channel leading to the control chamber. From EP 0957262 A2 and DE 100 37 388 Al each filter arranged in the inlet to the control chamber of a Kraftstoffinj are known per se.
Die Aufgabe der Erfindung ist es einen verbesserten Kraftstoffinj ektor der vorausgesetzten Art zu schaffen. Insbesondere soll ein Kraftstoffinj ektor geschaffen werden, wel- eher gegen in dem zugeführten Kraftstoff enthaltene Fremdkörperpartikel weitestgehend unempfindlich ist.The object of the invention is to provide an improved fuel injector of the presumed kind. In particular, a fuel injector is to be created which rather, is largely insensitive to foreign body particles contained in the fuel supplied.
Die Aufgabe wird durch einen Kraftstoffinj ektor mit den Merk¬ malen des Anspruchs 1 gelöst .The object is achieved by a fuel injector with the shopping ¬ paint 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 Kraftstoffinj ektor 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 Kraftstoffinj ektors 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.The invention provides a fuel injector for internal combustion engines, which has in a nozzle body an axial, flowed through by the fuel bore. 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 displaceable sleeve. The sleeve is adjacent, resiliently supported on the nozzle needle, in abutment against an axially adjacent to the nozzle body component of Kraftstoffinj ector a control chamber from which is connected via an inlet channel in the socket with the fuel-flow space on the outside of the socket in conjunction, and the one Having controlled by a control valve drain channel. According to the invention, a filter is provided on the bushing for filtering the fuel flowing through the inlet channel to the control chamber.
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. Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Filter am Umfang der Buchse vorgesehen.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. 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 Umfangen ausgebildet und der Filter ist auf dem kleineren, im Umfang zurückgenommenen Durchmesser der Buchse angeordnet .Conveniently, the sleeve is formed with two sections with different circumferences and the filter is disposed on the smaller, recessed diameter of the bushing.
Vorzugsweise ist die Buchse im Bereich eines steueraumseiti- gen Abschnitts bis zum Rand gegenüber einem steuerraumabge- wandten Abschnitt im Durchmesser zurückgenommen und der Durchmesserunterschied bildet eine radiale Stufe für die stirnseitige Anlage des Filters.Preferably, the bushing in the region of a control-end-side section is retracted to the edge in relation to a section facing away from the control space, and the difference in diameter forms a radial step for the end-face 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 Kraftstoffström aufnehmende Ausnehmung ausgebildet .In accordance with a preferred embodiment of the invention, a recess receiving the fuel flow passing through the filter is also formed on the bushing within the filter.
Vorzugsweise ist die Ausnehmung in Form einer umlaufenden ringförmigen Nut ausgebildet . Vorzugsweise enthält der zum Steuerraum führende Zulaufkanal eine den Zustrom begrenzende Zulaufdrossel .Preferably, the recess is formed in the form of a circumferential annular groove. 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 Kraftstoffström und ist dadurch selbstreinigend. Im folgenden wird ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffinjektors anhand der Zeichnung erläutert.According to a preferred embodiment of the invention, the filter is located in the Kraftstoffström injected and thus is self-cleaning. In the following an embodiment of the fuel injector according to the invention will be explained with reference to the drawing.
Es zeigen:Show it:
Figur 1 eine teilweise Querschnittsdarstellung eines Kraftstoffinjektors gemäß einem ersten Ausführungsbeispiel der Erfindung;Figure 1 is a partial cross-sectional view of a fuel injector according to a first embodiment of the invention;
Figur 2 eine Ansicht eines Details A aus Figur 1 undFigure 2 is a view of a detail A of Figure 1 and
Figur 3 eine Ausführungsvariante in einer Detailansicht entsprechend Figur 2.FIG. 3 shows a variant embodiment in a detail view corresponding to 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 Kraftstoffinj ektor um- fasst 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 .FIG. 1 shows a part of a fuel injector which is provided for injecting fuel stored under high pressure in a fuel accumulator (common rail), not shown. 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 to be guided in a longitudinally displaceable manner. 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 reservoir under high pressure is supplied to the tip of the nozzle needle 6 in a ring-shaped surrounding nozzle leading chamber 14 via a in the form of an axially extending in the nozzle body 7 bore 8 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 abge- stützt und grenzt in Anlage gegen ein axial an den Düsenkör¬ per 7 anschließendes Bauteil des Kraftstoffinj ektors 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 on the nozzle needle 6 abge- supports and abuts in plant against an axially adjacent to the Düsenkör ¬ per 7 component of Kraftstoffinj 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 conjunction.
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 shown in FIG. 1 and in particular the enlarged detailed representations of two variants shown in FIGS. 2 and 3, the control chamber 10 is bounded circumferentially by the bush 1 surrounding the nozzle needle 6 and tightly against it, which is surrounded by the fuel supplied via the high-pressure bore 8 , 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 Figure 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 Figure 3, the withdrawn diameter 11 extends on a part of the sleeve to the upper end of the bushing 1, which has the mounting advantage that the filter 3 from above on the bushing 1 until it stops at a lower, formed by the diameter withdrawal, Radial stage can be pushed. 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 Kraftstoffström aufnehmende, in Form einer umlaufenden ringförmigen Nut 12 ausgebildete Ausnehmung vorgesehen.Furthermore, on the bushing 1 within the filter 3 and in the region of the withdrawn diameter 11, a recess which passes through the filter 3 and receives a fuel flow formed in the form of a circumferential annular groove 12 is 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. According to FIG. 3, the inflow throttle 2 opening into the control chamber is directed such 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
Buchse Zulaufdrossel Filter Ablaufdrossel Feder Düsennadel Injektorgehäuse, Düsenkörper Hochdruckkanal , axiale Bohrung Vorkammer Steuerraum zurückgenommener Durchmesser Nut Einspritzdüse Düsenvorraum Bush inlet throttle filter outlet throttle spring nozzle needle injector housing, nozzle body high-pressure channel, axial bore pilot chamber control chamber withdrawn diameter groove injector nozzle antechamber

Claims

Patentansprüche claims
1. Kraftstoffinjektor für Brennkraftmaschinen, der in einem Düsenkörper (7) eine axiale, vom einzuspritzenden Kraftstoff durchströmte Bohrung (8) aufweist, die eine im Düsenkörper (7) axial verschieblich geführte Düsennadel1. A fuel injector for internal combustion engines, in a nozzle body (7) has an axial flow-through of the fuel to be injected bore (8), the one in the nozzle body (7) axially displaceably guided nozzle needle
(6) aufnimmt, die an ihrem einen Ende eine Sitzfläche im Düsenkörper besitzt, und die an ihrem anderen Ende eine auf dem Umfang der Düsennadel (6) aufsitzende, relativ zur Düsennadel (6) axial verschiebliche Buchse (1) trägt, die, federnd an der Düsennadel (6) abgestützt, in Anlage gegen ein axial an den Düsenkörper (7) anschließendes Bauteil des Kraftstoffinjektors einen Steuerraum(6) receives, which has at its one end a seat in the nozzle body, and at its other end a on the circumference of the nozzle needle (6) seated, relative to the nozzle needle (6) axially displaceable sleeve (1) carries, which, resiliently supported on the nozzle needle (6), in abutment against a axially to the nozzle body (7) adjoining component of the fuel injector a control chamber
(10) abgrenzt, der über einen Zulaufkanal (2, 9) in der Buchse (1) mit dem kraftstoffumströmten Raum auf der Außenseite der Buchse (1) in Verbindung steht, und der einen von einem Steuerventil gesteuerten Ablaufkanal (4) aufweist, dadurch gekennzeichnet, dass an der Buchse (1) ein Filter (3) zur Filterung des über den Zulaufkanal (2, 9) zum Steuerraum (10) strömenden Kraftstoffs vorgesehen ist.(10) delimits, which is connected via an inlet channel (2, 9) in the bushing (1) with the fuel-flow space on the outside of the bushing (1) and having a control valve controlled by a flow channel (4), characterized in that a filter (3) for filtering the fuel flowing via the inlet channel (2, 9) to the control chamber (10) is provided on the bushing (1).
2. Kraftstoffinjektor nach Anspruch 1, dadurch gekennzeichnet, dass der Filter (3) am Umfang der Buchse (1) vorgesehen ist. 2. Fuel injector according to claim 1, characterized in that the filter (3) on the circumference of the bushing (1) is provided.
3. Kraftstoffinjektor nach Anspruch 2, dadurch gekennzeichnet, dass der Filter (3) den Umfang der Buchse (1) umgebend ringförmig ausgebildet ist.3. Fuel injector according to claim 2, characterized in that the filter (3) surrounding the circumference of the bushing (1) is annular.
4. Kraftstoffinjektor nach Anspruch 3, dadurch gekennzeichnet, dass der Filter (3) in Form der Mantelfläche eines Kreiszylinders ausgebildet ist.4. Fuel injector according to claim 3, characterized in that the filter (3) is designed in the form of the lateral surface of a circular cylinder.
5. Kraftstoffinjektor nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, dass die Buchse (1) zwei Abschnitte mit unterschiedlichen Umfangen aufweist, und dass der Filter (3) auf dem kleineren, im Umfang zurückgenommenen Durchmesser (11) der Buchse (1) angeordnet ist.5. Fuel injector according to claim 1, 2, 3 or 4, characterized in that the bushing (1) has two sections with different circumference, and that the filter (3) on the smaller, recessed in the circumference diameter (11) of the bushing ( 1) is arranged.
6. Kraftstoffinjektor nach Anspruch 5, dadurch gekennzeichnet, dass die Buchse (1) im Bereich eines steueraumseitigen Abschnitts bis zum Rand gegenüber einem steuerraumabge- wandten Abschnitt im Durchmesser zurückgenommen ist, und dass der Durchmesserunterschied eine radiale Stufe für die stirnseitige Anlage des Filters (3) bildet.6. Fuel injector according to claim 5, characterized in that the bushing (1) in the region of a control-room-side portion to the edge opposite a steuerraumabge- turned section in diameter is withdrawn, and that the difference in diameter a radial step for the end-face conditioning of the filter (3 ).
7. Kraftstoffinjektor nach Anspruch 5, dadurch gekennzeichnet, dass der zurückgenommene Durchmesser (11) eine den Filter (3) aufnehmende Ausnehmung in Form einer umlaufenden ringförmigen Nut mit zwei radialen Stufen bildet.7. Fuel injector according to claim 5, characterized in that the recessed diameter (11) forms a filter (3) receiving recess in the form of a circumferential annular groove with two radial stages.
8. Kraftstoffinjektor nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass an der Buchse (1) innerhalb des Filters (3) und im Bereich des zurückgenommenen Durchmessers (11) eine den durch den Filter (3) hindurchtretenden Kraftstoffström aufnehmende Ausnehmung (12) ausgebildet ist.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 bush (1) within the filter (3) and in the region of the withdrawn diameter (11).
9. Kraftstoffinjektor nach Anspruch 8, dadurch gekennzeichnet, dass die Ausnehmung (12) in Form einer umlaufenden ringförmigen Nut ausgebildet ist.9. Fuel injector according to claim 8, characterized in that the recess (12) is designed in the form of a circumferential annular groove.
10. Kraftstoffinjektor nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der zum Steuerraum (10) führende Zulaufkanal (2, 9) eine den Zustrom begrenzende Zulaufdrossel (2) enthält.10. Fuel injector according to one of claims 1 to 9, characterized in that the control space (10) leading inlet channel (2, 9) includes a inflow limiting the inlet throttle (2).
11. Kraftstoffinjektor nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der zum Steuerraum (10) führende Zulaufkanal (2, 9) eine den Zustrom sammelnde Vorkammer (9) enthält.11. Fuel injector according to one of claims 1 to 10, characterized in that the control chamber (10) leading inlet channel (2, 9) containing an inflow collecting antechamber (9).
12. Kraftstoffinjektor nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass der zum Steuerraum (10) führende Zulaufkanal (2, 9) in der Buchse (1) ausgebildet ist.12. Fuel injector according to one of claims 1 to 11, characterized in that the control chamber (10) leading inlet channel (2, 9) in the socket (1) is formed.
13. Kraftstoffinjektor nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass der zum Steuerraum (10) führende Zulaufkanal (2, 9) im Schaft der Düsennadel (6) ausgebildet ist.13. Fuel injector according to one of claims 1 to 12, characterized in that the control chamber (10) leading inlet channel (2, 9) in the shaft of the nozzle needle (6) is formed.
14. Kraftstoffinjektor nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Filter (3) durch ein Drahtgewebe oder ein Drahtgeflecht gebildet ist . 14. Fuel injector according to one of claims 1 to 13, characterized in that the filter (3) is formed by a wire mesh or a wire mesh.
15. Kraftstoffinj ektor nach Anspruch 14, dadurch gekennzeichnet, dass das Drahtgewebe oder Drahtgeflecht gesintert ist.15. fuel injector according to claim 14, characterized in that the wire mesh or wire mesh is sintered.
16. Kraftstoffinjektor nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Filter (3) durch ein Gewebelaminat gebildet ist.16. Fuel injector according to one of claims 1 to 13, characterized in that the filter (3) is formed by a fabric laminate.
17. Kraftstoffinjektor nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Filter (3) durch einen Sinterwerkstoff gebildet ist.17. Fuel injector according to one of claims 1 to 13, characterized in that the filter (3) is formed by a sintered material.
18. Kraftstoffinjektor nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Filter (3) durch einen Spaltfilter gebildet ist.18. Fuel injector according to one of claims 1 to 13, characterized in that the filter (3) is formed by a gap filter.
19. Kraftstoffinj ektor nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Filter (3) durch einen Filter mit kreis-, el- lipsen- oder polygonförmigen Löchern gebildet ist.19. Fuel injector according to one of claims 1 to 13, characterized in that the filter (3) is formed by a filter with circular, ellipsen- or polygonal-shaped holes.
20. Kraftstoffinjektor nach einem der Ansprüche 14 bis 19, dadurch gekennzeichnet, dass der Filter (3) durch Schweißen an der Buchse (1) befestigt ist.20. Fuel injector according to one of claims 14 to 19, characterized in that the filter (3) is fixed by welding to the bushing (1).
21. Kraftstoffinjektor nach einem der Ansprüche 1 bis 20, dadurch gekennzeichnet, dass der Filter (3) im einzuspritzenden Kraftstoffström angeordnet ist und dadurch selbstreinigend ist. 21. Fuel injector according to one of claims 1 to 20, characterized in that the filter (3) is arranged in the Kraftstoffström injected and thereby is 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

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

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JP (1) JP4869345B2 (en)
KR (1) KR101029214B1 (en)
AT (1) ATE426741T1 (en)
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Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2175124B1 (en) * 2006-10-16 2014-09-24 Ganser-Hydromag AG Fuel injector 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
DE102011016168B4 (en) 2011-04-05 2015-02-12 L'orange Gmbh Fuel injector for an internal combustion 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
US10704444B2 (en) 2018-08-21 2020-07-07 Tenneco Automotive Operating Company Inc. Injector fluid filter with upper and lower lip seal
DE102018221604A1 (en) * 2018-12-13 2020-06-18 Robert Bosch Gmbh Fuel injector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007012433A1 *

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KR101029214B1 (en) 2011-04-12
ATE426741T1 (en) 2009-04-15
DE102005035347B3 (en) 2006-08-10
JP2009503325A (en) 2009-01-29
DE502006003278D1 (en) 2009-05-07
EP1907689B1 (en) 2009-03-25
JP4869345B2 (en) 2012-02-08
KR20080034908A (en) 2008-04-22

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