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WO2008058799A1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
WO2008058799A1
WO2008058799A1 PCT/EP2007/060107 EP2007060107W WO2008058799A1 WO 2008058799 A1 WO2008058799 A1 WO 2008058799A1 EP 2007060107 W EP2007060107 W EP 2007060107W WO 2008058799 A1 WO2008058799 A1 WO 2008058799A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
fuel injector
nozzle body
extension
combustion chamber
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.)
Ceased
Application number
PCT/EP2007/060107
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2008058799A1 publication Critical patent/WO2008058799A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-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
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001Control chambers formed by movable sleeves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0028Valves characterised by the valve actuating means hydraulic
    • F02M63/0029Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/0012Valves
    • F02M63/0031Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045Three-way valves

Definitions

  • the invention relates to a fuel injector with a holding body to which a nozzle body is fastened by means of a nozzle retaining nut, in which a nozzle needle is guided from a closed position to an open position to and fro, in which high-pressure fuel is injected into a combustion chamber of an internal combustion engine ,
  • Conventional fuel injectors have an outer diameter of 19 millimeters.
  • the object of the invention is to provide a fuel injector according to the preamble of claim 1, which is versatile and inexpensive to produce.
  • the object is in a fuel injector with a holding body to which a nozzle body is fixed by means of a nozzle retaining nut, in which a nozzle needle is guided from a closed position to an open position movable back and forth, injected in the high-pressure fuel into a combustion chamber of an internal combustion engine is achieved by the fact that the nozzle body at its end remote from the combustion chamber a Has nozzle body extension.
  • the artificial nozzle body extension makes it possible to narrow the fuel injector at its end close to the combustion chamber, in particular to an outside diameter of 17 millimeters. This provides the advantage that the fuel injector according to the invention can also be used in smaller engines.
  • the hydraulic volume in the nozzle body is increased by the artificial nozzle body extension. As a result, occurring during operation of the fuel injector hydraulic vibrations can be reduced.
  • a preferred embodiment of the fuel injector is characterized in that the nozzle body extension is integrally connected to the nozzle body.
  • the nozzle body with the nozzle body extension is longer than conventional nozzle body.
  • a further preferred embodiment of the fuel injector is characterized in that the nozzle body extension comprises an extension sleeve which has a combustion chamber near end face, which bears against a combustion chamber remote end face of the nozzle body.
  • the extension sleeve is an additional component.
  • a further preferred embodiment of the fuel injector is characterized in that the extension sleeve has the shape of a straight circular cylinder jacket.
  • the shape of the extension sleeve is adapted to the shape of the combustion chamber distal end of the nozzle body.
  • a further preferred embodiment of the fuel injector is characterized in that the extension sleeve has the same inner diameter and / or the same outer diameter as the nozzle body.
  • the thickness of the extension sleeve is adapted to the thickness of the combustion chamber distal end of the nozzle body.
  • a further preferred embodiment of the fuel injector is characterized in that in the extension sleeve a control raumbegrenzungshülse is arranged, in which the combustion chamber remote end of the nozzle needle defines a control room.
  • the control chamber limiting sleeve preferably has a biting edge at its end remote from the combustion chamber.
  • a further preferred embodiment of the fuel injector is characterized in that between the extension of the nozzle body and the holding body, a throttle plate and / or a valve plate are arranged / is.
  • the valve plate and / or the throttle plate are / is part of a control valve device which is integrated in the fuel injector.
  • the nozzle needle has a nozzle needle extension.
  • the nozzle needle extension is the same size as the nozzle body extension.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that the nozzle retaining nut, at least at its end remote from the combustion chamber, has an outer diameter of 17 millimeters.
  • the fuel injector according to the invention in particular at its end remote from the combustion chamber, has an outer diameter that is two millimeters smaller than conventional fuel injectors.
  • the invention further relates to a construction kit for a previously described fuel injector, with nozzle needles, nozzle bodies and nozzle clamping nuts, which are of different lengths and / or of different sizes
  • the nozzle body can be made in one or more parts, that is with at least one extension sleeve.
  • the modular system according to the invention allows with only three new components an embodiment of the fuel injector with an outer diameter of 17 millimeters in the lower region of the fuel injector.
  • the accompanying figure shows a partial view of a fuel injector according to the invention in longitudinal section.
  • the accompanying figure shows a fuel injector, which is also referred to as a fuel injection valve, and is intended for installation in an internal combustion engine, not shown, of a motor vehicle.
  • the fuel injector is designed as a common rail injector for injecting preferably diesel fuel.
  • the fuel injector comprises an injector housing 1 with a nozzle module 2 and a valve control module 3.
  • the nozzle module 2 comprises a nozzle needle 8 arranged and guided in a nozzle body 5.
  • the nozzle needle 8 has at one end a nozzle needle tip 9 which is located in the free end of the nozzle needle Nozzle body 5 provided injection holes 11, 12 closes.
  • the nozzle needle tip 9 is also referred to as the combustion chamber near the end of the nozzle needle 8.
  • the end of the nozzle body 5 with the spray holes 11, 12 referred to as the combustion chamber near the end of the nozzle body 5.
  • the valve control module 3 comprises a throttle plate 15 and a valve plate 16.
  • the throttle plate 15 and the valve plate 16 are clamped with the interposition of an extension sleeve 20 by means of a nozzle lock nut 22 against a holding body 18.
  • the extension sleeve 20 is in Extension of the nozzle body in the axial direction between the nozzle body 5 and the throttle plate 15 is arranged.
  • the valve plate 16 is arranged in the axial direction between the throttle plate 15 and the holding body 18.
  • the holding body 18 is provided with an external thread 23, in particular a metric external thread M15, onto which a complementarily formed internal thread of the nozzle clamping nut 22 is screwed.
  • the nozzle body 5 has at its combustion chamber remote end the shape of a straight circular cylinder jacket.
  • the extension sleeve 20 also has the
  • Shape of a straight circular cylinder jacket whose shape is adapted to the shape of the combustion chamber remote end of the nozzle body 5.
  • the combustion chamber remote end of the nozzle body 5 and the extension sleeve 20 define radially inwardly a substantially circular cylindrical hydraulic volume 24, which is filled via a fuel inlet 26 with highly pressurized fuel.
  • the hydraulic volume 24 communicates with a pressure chamber 32 via a connecting channel, which is recessed between a flat 31 and the nozzle body 5.
  • the high-pressure passage 30 includes a first high-pressure passage portion 27 passing through the throttle plate 15, a second high-pressure passage portion 28 passing through the valve plate 16, and a third high-pressure passage portion 29 passing through the holding body 18.
  • the nozzle needle tip 9 opposite end of the nozzle needle 8 is also referred to as the combustion chamber distal end of the nozzle needle 8 and limited in the axial direction of a control chamber 34 which is bounded in the radial direction by a control chamber limiting sleeve 36.
  • the control chamber limiting sleeve 36 At its end remote from the combustion chamber, the control chamber limiting sleeve 36 has a biting edge which digs into the throttle plate 15.
  • a nozzle spring 38 is clamped between the combustion chamber near the end of the control chamber limiting sleeve 36 and a spring plate 39.
  • the fe- derteller 39 is supported on a shoulder 40 which is provided on the nozzle needle 8.
  • the control chamber limiting sleeve 36 is held with its biting edge in abutment against the throttle plate 15.
  • the nozzle needle tip 9 of the nozzle needle 8 is held by the biasing force of the nozzle spring 38 in abutment with its associated sealing seat.
  • the control chamber 34 is filled with high-pressure fuel via a feed channel 42 equipped with an inlet throttle 41 from the fuel inlet 26.
  • the control chamber 34 communicates with a valve chamber 48 via a drain channel 45 equipped with an outlet throttle 44.
  • a control valve body 50 is arranged in the valve chamber 48.
  • the control valve body 50 can be actuated with the interposition of a booster piston 52 by an actuator (not shown), in particular a piezoactuator.
  • control valve body 50 When the control valve body 50 is actuated via the actuator, it releases a pressure relief connection between the valve chamber 48 and a pressure relief space. Then, the pressure in the control chamber 34 is reduced via the drainage channel 45, so that the nozzle needle 8 lifts with its tip 9 from the associated sealing seat.
  • the valve chamber 48 communicates via a connecting channel 54 with the hydraulic volume 24 in connection.
  • the connecting passage 54 is closable by the control valve body 50 when it is actuated.
  • the nozzle body 5 is extended by the extension sleeve 20.
  • the outer diameter of the extension sleeve 20 is exactly as large as the outer diameter of the combustion chamber distal end of the nozzle body 5.
  • the nozzle needle 8 is extended by the same length by which the nozzle body 5 is extended by the extension sleeve 20.
  • the nozzle retaining nut 22 is extended by the length of the extension sleeve 20.
  • a kit is provided in a simple manner, with three new components, namely with the extension sleeve 20, the elongated nozzle needle 8 and the extended nozzle lock nut 22, the creation of a fuel injector with an outer diameter 60 of 17 millimeters in the lower part of the injector, that is, at the combustion chamber end of the nozzle retaining nut 22.

Landscapes

  • 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)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel injector with a mounting body (18) to which a nozzle body (5) is fixed using a nozzle clamping nut (22), wherein a nozzle needle (8) is guided in a way that is movable backwards and forwards from a closed position into an open position, wherein fuel under high pressure is injected into a combustion chamber of an internal combustion engine. In order to produce a fuel injector that can be used in many types of applications and that can be cheaply produced, the nozzle body (5) has, on the end thereof that is remote from the combustion chamber, a nozzle body extension.

Description

Beschreibung description

Titel KraftstoffinjektorTitle fuel injector

Die Erfindung betrifft einen Kraftstoffinjektor mit einem Haltekörper, an dem mit Hilfe einer Düsenspannmutter ein Düsenkörper befestigt ist, in dem eine Düsennadel aus einer Schließstellung in eine Öffnungsstellung hin und her bewegbar geführt ist, in der mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird.The invention relates to a fuel injector with a holding body to which a nozzle body is fastened by means of a nozzle retaining nut, in which a nozzle needle is guided from a closed position to an open position to and fro, in which high-pressure fuel is injected into a combustion chamber of an internal combustion engine ,

Stand der TechnikState of the art

Herkömmliche Kraftstoffinjektoren haben einen Außendurchmesser von 19 Millimetern.Conventional fuel injectors have an outer diameter of 19 millimeters.

Vorteile der ErfindungAdvantages of the invention

Aufgabe der Erfindung ist es, einen Kraftstoffinjektor gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, der vielseitig einsetzbar und kostengüns- tig herstellbar ist.The object of the invention is to provide a fuel injector according to the preamble of claim 1, which is versatile and inexpensive to produce.

Die Aufgabe ist bei einem Kraftstoffinjektor mit einem Haltekörper, an dem mit Hilfe einer Düsenspannmutter ein Düsenkörper befestigt ist, in dem eine Düsennadel aus einer Schließstellung in eine Öffnungsstellung hin und her bewegbar geführt ist, in der mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird, dadurch gelöst, dass der Düsenkörper an seinem brennraumfernen Ende eine Düsenkörperverlängerung aufweist. Die künstliche Düsenkörperverlänge- rung ermöglicht es, den Kraftstoffinjektor an seinem brennraumnahen Ende, insbesondere auf einen Außendurchmesser von 17 Millimetern, einzuengen. Das liefert den Vorteil, dass der erfindungsgemäße Kraftstoffinjektor auch in kleineren Motoren eingesetzt werden kann. Darüber hinaus wird durch die künstliche Düsenkörperverlängerung das hydraulische Volumen in dem Düsenkörper vergrößert. Dadurch können im Betrieb des Kraftstoffinjektors auftretende hydraulische Schwingungen reduziert werden.The object is in a fuel injector with a holding body to which a nozzle body is fixed by means of a nozzle retaining nut, in which a nozzle needle is guided from a closed position to an open position movable back and forth, injected in the high-pressure fuel into a combustion chamber of an internal combustion engine is achieved by the fact that the nozzle body at its end remote from the combustion chamber a Has nozzle body extension. The artificial nozzle body extension makes it possible to narrow the fuel injector at its end close to the combustion chamber, in particular to an outside diameter of 17 millimeters. This provides the advantage that the fuel injector according to the invention can also be used in smaller engines. In addition, the hydraulic volume in the nozzle body is increased by the artificial nozzle body extension. As a result, occurring during operation of the fuel injector hydraulic vibrations can be reduced.

Ein bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Düsenkörperverlängerung einstückig mit dem Düsenkörper verbunden ist. Der Düsenkörper mit der Düsenkörperverlängerung ist länger als herkömmliche Düsenkörper.A preferred embodiment of the fuel injector is characterized in that the nozzle body extension is integrally connected to the nozzle body. The nozzle body with the nozzle body extension is longer than conventional nozzle body.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Düsenkörperverlängerung eine Verlängerungshülse umfasst, die eine brennraumnahe Stirnfläche aufweist, die an einer brennraumfernen Stirnfläche des Düsenkörpers anliegt. Bei der Verlängerungshülse handelt es sich um ein zusätzliches Bauteil.A further preferred embodiment of the fuel injector is characterized in that the nozzle body extension comprises an extension sleeve which has a combustion chamber near end face, which bears against a combustion chamber remote end face of the nozzle body. The extension sleeve is an additional component.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Verlängerungshülse die Gestalt eines geraden Kreiszylindermantels aufweist. Vorzugsweise ist die Gestalt der Verlängerungshülse an die Gestalt des brennraumfernen Endes des Dü- senkörpers angepasst.A further preferred embodiment of the fuel injector is characterized in that the extension sleeve has the shape of a straight circular cylinder jacket. Preferably, the shape of the extension sleeve is adapted to the shape of the combustion chamber distal end of the nozzle body.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Verlängerungshülse den gleiche Innendurchmesser und/oder den gleichen Außendurchmesser wie der Düsen- körper aufweist. Vorzugsweise ist die Dicke der Verlängerungshülse an die Dicke des brennraumfernen Endes des Düsenkörpers angepasst.A further preferred embodiment of the fuel injector is characterized in that the extension sleeve has the same inner diameter and / or the same outer diameter as the nozzle body. Preferably, the thickness of the extension sleeve is adapted to the thickness of the combustion chamber distal end of the nozzle body.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass in der Verlängerungshülse eine Steuer- raumbegrenzungshülse angeordnet ist, in der das brennraumferne Ende der Düsennadel einen Steuerraum begrenzt. Vorzugsweise weist die Steu- erraumbegrenzungshülse an ihrem brennraumfernen Ende eine Beißkante auf.A further preferred embodiment of the fuel injector is characterized in that in the extension sleeve a control raumbegrenzungshülse is arranged, in which the combustion chamber remote end of the nozzle needle defines a control room. The control chamber limiting sleeve preferably has a biting edge at its end remote from the combustion chamber.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass zwischen der Verlängerung des Düsenkörpers und dem Haltekörper eine Drosselplatte und/oder eine Ventilplatte angeordnet sind/ist. Die Ventilplatte und/oder die Drosselplatte sind/ist Teil einer Steuerventileinrichtung, die in den Kraftstoffinjektor integriert ist.A further preferred embodiment of the fuel injector is characterized in that between the extension of the nozzle body and the holding body, a throttle plate and / or a valve plate are arranged / is. The valve plate and / or the throttle plate are / is part of a control valve device which is integrated in the fuel injector.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Düsennadel eine Düsennadelverlänge- rung aufweist. Vorzugsweise ist die Düsennadelverlängerung genauso groß wie die Düsenkörperverlängerung.Another preferred exemplary embodiment of the fuel injector is characterized in that the nozzle needle has a nozzle needle extension. Preferably, the nozzle needle extension is the same size as the nozzle body extension.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Düsenspannmutter, zumindest an ihrem brennraumfernen Ende, einen Außendurchmesser von 17 Millimetern auf- weist. Damit hat der erfindungsgemäße Kraftstoffinjektor, insbesondere an seinem brennraumfernen Ende, einen um zwei Millimeter geringeren Außendurchmesser als herkömmliche Kraftstoffinjektoren.A further preferred exemplary embodiment of the fuel injector is characterized in that the nozzle retaining nut, at least at its end remote from the combustion chamber, has an outer diameter of 17 millimeters. Thus, the fuel injector according to the invention, in particular at its end remote from the combustion chamber, has an outer diameter that is two millimeters smaller than conventional fuel injectors.

Die Erfindung betrifft des Weiteren einen Baukasten für einen vorab be- schriebenen Kraftstoffinjektor, mit Düsennadeln, Düsenkörpern und Düsen- spannmuttern, die unterschiedlich lang sind und/oder unterschiedlich großeThe invention further relates to a construction kit for a previously described fuel injector, with nozzle needles, nozzle bodies and nozzle clamping nuts, which are of different lengths and / or of different sizes

Außendurchmesser aufweisen. Die Düsenkörper können einteilig oder mehrteilig, das heißt mit mindestens einer Verlängerungshülse, ausgeführt sein. Der erfindungsgemäße Baukasten ermöglicht mit nur drei neuen Bau- teilen eine Ausführung des Kraftstoffinjektors mit einem Außendurchmesser von 17 Millimetern im unteren Bereich des Kraftstoffinjektors. Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist.Have outer diameter. The nozzle body can be made in one or more parts, that is with at least one extension sleeve. The modular system according to the invention allows with only three new components an embodiment of the fuel injector with an outer diameter of 17 millimeters in the lower region of the fuel injector. Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail.

Zeichnungdrawing

Die beiliegende Figur zeigt eine Teildarstellung eines erfindungsgemäßen Kraftstoffinjektors im Längsschnitt.The accompanying figure shows a partial view of a fuel injector according to the invention in longitudinal section.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die beiliegende Figur zeigt einen Kraftstoffinjektor, der auch als Kraftstoffeinspritzventil bezeichnet wird, und zum Einbau in eine nicht dargestellte Brennkraftmaschine eines Kraftfahrzeugs vorgesehen ist. Der Kraftstoffin- jektor ist als Common-Rail-Injektor zur Einspritzung von vorzugsweise Dieselkraftstoff ausgebildet.The accompanying figure shows a fuel injector, which is also referred to as a fuel injection valve, and is intended for installation in an internal combustion engine, not shown, of a motor vehicle. The fuel injector is designed as a common rail injector for injecting preferably diesel fuel.

Der Kraftstoffinjektor umfasst ein Injektorgehäuse 1 mit einem Düsenmodul 2 und einem Ventilsteuermodul 3. Das Düsenmodul 2 umfasst eine in ei- nem Düsenkörper 5 angeordnete und geführte Düsennadel 8. Die Düsennadel 8 weist an einem Ende eine Düsennadelspitze 9 auf, die in dem freien Ende des Düsenkörpers 5 vorgesehene Spritzlöcher 11, 12 verschließt. Wenn die Düsennadelspritze 9 von einem zugehörigen Dichtsitz abhebt, dann wird mit Hochdruck beaufschlagter Kraftstoff durch die Spritzlöcher 11, 12 in einen Brennraum einer Brennkraftmaschine eingespritzt. Daher wird die Düsennadelspitze 9 auch als brennraumnahes Ende der Düsennadel 8 bezeichnet. Analog wird das Ende des Düsenkörpers 5 mit den Spritzlöchern 11, 12 als brennraumnahes Ende des Düsenkörpers 5 bezeichnet.The fuel injector comprises an injector housing 1 with a nozzle module 2 and a valve control module 3. The nozzle module 2 comprises a nozzle needle 8 arranged and guided in a nozzle body 5. The nozzle needle 8 has at one end a nozzle needle tip 9 which is located in the free end of the nozzle needle Nozzle body 5 provided injection holes 11, 12 closes. When the nozzle needle syringe 9 lifts from an associated sealing seat, high pressure fuel is injected through the injection holes 11, 12 into a combustion chamber of an internal combustion engine. Therefore, the nozzle needle tip 9 is also referred to as the combustion chamber near the end of the nozzle needle 8. Similarly, the end of the nozzle body 5 with the spray holes 11, 12 referred to as the combustion chamber near the end of the nozzle body 5.

Das Ventilsteuermodul 3 umfasst eine Drosselplatte 15 und eine Ventilplatte 16. Die Drosselplatte 15 und die Ventilplatte 16 sind unter Zwischenschaltung einer Verlängerungshülse 20 mit Hilfe einer Düsenspannmutter 22 gegen einen Haltekörper 18 verspannt. Die Verlängerungshülse 20 ist in Verlängerung des Düsenkörpers in axialer Richtung zwischen dem Düsenkörper 5 und der Drosselplatte 15 angeordnet. Die Ventilplatte 16 ist in axialer Richtung zwischen der Drosselplatte 15 und dem Haltekörper 18 angeordnet. Der Haltekörper 18 ist mit einem Außengewinde 23, insbesonde- re einem metrischen Außengewinde M15, versehen, auf das ein komplementär ausgebildetes Innengewinde der Düsenspannmutter 22 aufgeschraubt ist.The valve control module 3 comprises a throttle plate 15 and a valve plate 16. The throttle plate 15 and the valve plate 16 are clamped with the interposition of an extension sleeve 20 by means of a nozzle lock nut 22 against a holding body 18. The extension sleeve 20 is in Extension of the nozzle body in the axial direction between the nozzle body 5 and the throttle plate 15 is arranged. The valve plate 16 is arranged in the axial direction between the throttle plate 15 and the holding body 18. The holding body 18 is provided with an external thread 23, in particular a metric external thread M15, onto which a complementarily formed internal thread of the nozzle clamping nut 22 is screwed.

Der Düsenkörper 5 hat an seinem brennraumfernen Ende die Gestalt eines geraden Kreiszylindermantels. Die Verlängerungshülse 20 hat ebenfalls dieThe nozzle body 5 has at its combustion chamber remote end the shape of a straight circular cylinder jacket. The extension sleeve 20 also has the

Gestalt eines geraden Kreiszylindermantels, dessen Gestalt an die Gestalt des brennraumfernen Endes des Düsenkörpers 5 angepasst ist. Das brennraumferne Ende des Düsenkörpers 5 und die Verlängerungshülse 20 begrenzen radial innen ein im Wesentlichen kreiszylinderförmiges hydrauli- sches Volumen 24, das über einen Kraftstoffzulauf 26 mit mit Hochdruck beaufschlagtem Kraftstoff gefüllt ist.Shape of a straight circular cylinder jacket whose shape is adapted to the shape of the combustion chamber remote end of the nozzle body 5. The combustion chamber remote end of the nozzle body 5 and the extension sleeve 20 define radially inwardly a substantially circular cylindrical hydraulic volume 24, which is filled via a fuel inlet 26 with highly pressurized fuel.

Das hydraulische Volumen 24 steht über einen Verbindungskanal, der zwischen einer Abflachung 31 und dem Düsenkörper 5 ausgespart ist, mit ei- nem Druckraum 32 in Verbindung. Der Hochdruckkanal 30 umfasst einen ersten Hochdruckkanalabschnitt 27, der durch die Drosselplatte 15 verläuft, einen zweiten Hochdruckkanalabschnitt 28, der durch die Ventilplatte 16 verläuft, und einen dritten Hochdruckkanalabschnitt 29, der durch den Haltekörper 18 verläuft.The hydraulic volume 24 communicates with a pressure chamber 32 via a connecting channel, which is recessed between a flat 31 and the nozzle body 5. The high-pressure passage 30 includes a first high-pressure passage portion 27 passing through the throttle plate 15, a second high-pressure passage portion 28 passing through the valve plate 16, and a third high-pressure passage portion 29 passing through the holding body 18.

Das der Düsennadelspitze 9 entgegengesetzte Ende der Düsennadel 8 wird auch als brennraumfernes Ende der Düsennadel 8 bezeichnet und begrenzt in axialer Richtung einen Steuerraum 34, der in radialer Richtung von einer Steuerraumbegrenzungshülse 36 begrenzt wird. Die Steuer- raumbegrenzungshülse 36 weist an ihrem brennraumfernen Ende eine Beißkante auf, die sich in die Drosselplatte 15 eingräbt.The nozzle needle tip 9 opposite end of the nozzle needle 8 is also referred to as the combustion chamber distal end of the nozzle needle 8 and limited in the axial direction of a control chamber 34 which is bounded in the radial direction by a control chamber limiting sleeve 36. At its end remote from the combustion chamber, the control chamber limiting sleeve 36 has a biting edge which digs into the throttle plate 15.

Zwischen dem brennraumnahen Ende der Steuerraumbegrenzungshülse 36 und einem Federteller 39 ist eine Düsenfeder 38 eingespannt. Der Fe- derteller 39 ist an einem Absatz 40 abgestützt, der an der Düsennadel 8 vorgesehen ist. Durch die Vorspannkraft der Düsenfeder 38 wird einerseits die Steuerraumbegrenzungshülse 36 mit ihrer Beißkante in Anlage an der Drosselplatte 15 gehalten. Andererseits wird die Düsennadelspitze 9 der Düsennadel 8 durch die Vorspannkraft der Düsenfeder 38 in Anlage an ihrem zugehörigen Dichtsitz gehalten.Between the combustion chamber near the end of the control chamber limiting sleeve 36 and a spring plate 39, a nozzle spring 38 is clamped. The fe- derteller 39 is supported on a shoulder 40 which is provided on the nozzle needle 8. By the biasing force of the nozzle spring 38 on the one hand, the control chamber limiting sleeve 36 is held with its biting edge in abutment against the throttle plate 15. On the other hand, the nozzle needle tip 9 of the nozzle needle 8 is held by the biasing force of the nozzle spring 38 in abutment with its associated sealing seat.

Der Steuerraum 34 wird über einen mit einer Zulaufdrossel 41 ausgestatteten Zulaufkanal 42 aus dem Kraftstoffzulauf 26 mit mit Hochdruck beauf- schlagtem Kraftstoff gefüllt. Über einen mit einer Ablaufdrossel 44 ausgestatteten Ablaufkanal 45 steht der Steuerraum 34 mit einem Ventilraum 48 in Verbindung. In dem Ventilraum 48 ist ein Steuerventilkörper 50 angeordnet. Der Steuerventilkörper 50 ist unter Zwischenschaltung eines Übersetzerkolbens 52 durch einen (nicht dargestellten) Aktor, insbesondere einen Piezoaktor, betätigbar.The control chamber 34 is filled with high-pressure fuel via a feed channel 42 equipped with an inlet throttle 41 from the fuel inlet 26. The control chamber 34 communicates with a valve chamber 48 via a drain channel 45 equipped with an outlet throttle 44. In the valve chamber 48, a control valve body 50 is arranged. The control valve body 50 can be actuated with the interposition of a booster piston 52 by an actuator (not shown), in particular a piezoactuator.

Wenn der Steuerventilkörper 50 über den Aktor betätigt wird, dann gibt er eine Druckentlastungsverbindung zwischen dem Ventilraum 48 und einem Druckentlastungsraum frei. Daraufhin wird der Druck in dem Steuerraum 34 über den Ablaufkanal 45 abgebaut, so dass die Düsennadel 8 mit ihrer Spitze 9 von dem zugehörigen Dichtsitz abhebt. Der Ventilraum 48 steht über einen Verbindungskanal 54 mit dem hydraulischen Volumen 24 in Verbindung. Der Verbindungskanal 54 ist durch den Steuerventilkörper 50 verschließbar, wenn dieser betätigt wird.When the control valve body 50 is actuated via the actuator, it releases a pressure relief connection between the valve chamber 48 and a pressure relief space. Then, the pressure in the control chamber 34 is reduced via the drainage channel 45, so that the nozzle needle 8 lifts with its tip 9 from the associated sealing seat. The valve chamber 48 communicates via a connecting channel 54 with the hydraulic volume 24 in connection. The connecting passage 54 is closable by the control valve body 50 when it is actuated.

Gemäß einem wesentlichen Aspekt der Erfindung ist der Düsenkörper 5 durch die Verlängerungshülse 20 verlängert. Der Außendurchmesser der Verlängerungshülse 20 ist genau so groß wie der Außendurchmesser des brennraumfernen Endes des Düsenkörpers 5. Die Düsennadel 8 ist um die gleiche Länge verlängert, um welche der Düsenkörper 5 durch die Verlängerungshülse 20 verlängert ist. Des Weiteren ist die Düsenspannmutter 22 um die Länge der Verlängerungshülse 20 verlängert. Somit wird auf einfache Art und Weise ein Baukasten geschaffen, der mit drei neuen Bauteilen, und zwar mit der Verlängerungshülse 20, der verlängerten Düsennadel 8 und der verlängerten Düsenspannmutter 22 die Schaffung eines Kraftstoffinjektors mit einem Außendurchmesser 60 von 17 Millimetern im unteren Bereich des Injektors, das heißt am brennraumfer- nen Ende der Düsenspannmutter 22, ermöglicht. According to an essential aspect of the invention, the nozzle body 5 is extended by the extension sleeve 20. The outer diameter of the extension sleeve 20 is exactly as large as the outer diameter of the combustion chamber distal end of the nozzle body 5. The nozzle needle 8 is extended by the same length by which the nozzle body 5 is extended by the extension sleeve 20. Furthermore, the nozzle retaining nut 22 is extended by the length of the extension sleeve 20. Thus, a kit is provided in a simple manner, with three new components, namely with the extension sleeve 20, the elongated nozzle needle 8 and the extended nozzle lock nut 22, the creation of a fuel injector with an outer diameter 60 of 17 millimeters in the lower part of the injector, that is, at the combustion chamber end of the nozzle retaining nut 22.

Claims

Patentansprüche claims 1. Kraftstoffinjektor mit einem Haltekörper (18), an dem mit Hilfe einer Düsenspannmutter (22) ein Düsenkörper (5) befestigt ist, in dem eine Düsennadel (8) aus einer Schließstellung in eine Öffnungsstellung hin und her bewegbar geführt ist, in der mit Hochdruck beaufschlagter1. A fuel injector with a holding body (18) on which by means of a nozzle retaining nut (22) a nozzle body (5) is fixed, in which a nozzle needle (8) is guided from a closed position to an open position to and fro, in the High pressure acted upon Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt wird, dadurch gekennzeichnet, dass der Düsenkörper (5) an seinem brennraumfernen Ende eine Düsenkörperverlängerung aufweist.Fuel is injected into a combustion chamber of an internal combustion engine, characterized in that the nozzle body (5) has at its combustion chamber remote end a nozzle body extension. 2. Kraftstoffinjektor nach Anspruch 1, dadurch gekennzeichnet, dass die Düsenkörperverlängerung einstückig mit dem Düsenkörper verbunden ist.2. Fuel injector according to claim 1, characterized in that the nozzle body extension is integrally connected to the nozzle body. 3. Kraftstoffinjektor nach Anspruch 1, dadurch gekennzeichnet, dass die Düsenkörperverlängerung eine Verlängerungshülse (20) umfasst, die eine brennraumnahe Stirnfläche aufweist, die an einer brennraumfernen Stirnfläche des Düsenkörpers (5) anliegt.3. Fuel injector according to claim 1, characterized in that the nozzle body extension comprises an extension sleeve (20) having a combustion chamber near end face, which bears against a combustion chamber remote end face of the nozzle body (5). 4. Kraftstoffinjektor nach Anspruch 3, dadurch gekennzeichnet, dass die Verlängerungshülse (20) die Gestalt eines geraden Kreiszylindermantels aufweist.4. Fuel injector according to claim 3, characterized in that the extension sleeve (20) has the shape of a straight circular cylinder jacket. 5. Kraftstoffinjektor nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Verlängerungshülse (20) den gleichen Innendurchmesser und/oder den gleichen Außendurchmesser wie der Düsenkörper (5) aufweist.5. Fuel injector according to claim 3 or 4, characterized in that the extension sleeve (20) has the same inner diameter and / or the same outer diameter as the nozzle body (5). 6. Kraftstoffinjektor nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass in der Verlängerungshülse (20) eine Steuer- raumbegrenzungshülse (36) angeordnet ist, in der das brennraumfer- ne Ende der Düsennadel (8) einen Steuerraum (34) begrenzt.6. Fuel injector according to one of claims 3 to 5, characterized in that in the extension sleeve (20) has a control Room limiting sleeve (36) is arranged, in which the brennraumfer- ne end of the nozzle needle (8) delimits a control chamber (34). 7. Kraftstoffinjektor nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, dass zwischen der Verlängerung des Düsenkörpers (5) und dem Haltekörper (18) eine Drosselplatte (15) und/oder eine Ventilplatte (16) angeordnet sind/ist.7. Fuel injector according to one of the preceding claims, character- ized in that between the extension of the nozzle body (5) and the holding body (18) has a throttle plate (15) and / or a valve plate (16) are arranged / is. 8. Kraftstoffinjektor nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, dass die Düsennadel (8) eine Düsennadel- verlängerung aufweist.8. Fuel injector according to one of the preceding claims, character- ized in that the nozzle needle (8) has a nozzle needle extension. 9. Kraftstoffinjektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Düsenspannmutter (22), zumindest an ihrem brennraumfernen Ende, einen Außendurchmesser von 179. Fuel injector according to one of the preceding claims, characterized in that the nozzle retaining nut (22), at least at its combustion chamber remote end, an outer diameter of the 17th Millimetern aufweist.Millimeters. 10. Baukasten für einen Kraftstoffinjektor nach einem der vorhergehenden Ansprüche, mit Düsennadeln, Düsenkörpern und Düsenspann- muttern, die unterschiedlich lang sind und/oder unterschiedlich große10. Construction kit for a fuel injector according to one of the preceding claims, with nozzle needles, nozzle bodies and nozzle clamping nuts, which are different lengths and / or different sizes Außendurchmesser aufweisen. Have outer diameter.
PCT/EP2007/060107 2006-11-16 2007-09-24 Fuel injector Ceased WO2008058799A1 (en)

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DE200610054064 DE102006054064A1 (en) 2006-11-16 2006-11-16 fuel injector
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP2134956A1 (en) * 2007-03-09 2009-12-23 Robert Bosch GmbH Fuel injector comprising an improved control valve
CN116181537A (en) * 2023-02-08 2023-05-30 钧风电控科技(泰州)有限责任公司 Electromagnetic valve sinking offset double-oil-inlet-channel oil sprayer

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Publication number Priority date Publication date Assignee Title
DE102013012525A1 (en) 2013-07-27 2015-01-29 Westfalia-Automotive Gmbh Trailer coupling system for motor vehicles

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DE10000027A1 (en) * 1999-02-10 2000-08-17 Caterpillar Inc Fuel injection device with controlled overflow, in which ram opens overflow passage to fuel compression chamber over part of distance
US20010035465A1 (en) * 1998-10-13 2001-11-01 Ronald D. Shinogle Fuel injector with rate shaping control through piezoelectric nozzle lift
EP1164283A2 (en) * 2000-06-15 2001-12-19 Toyota Jidosha Kabushiki Kaisha A fuel injection valve
WO2004070192A1 (en) * 2003-02-05 2004-08-19 Robert Bosch Gmbh Fuel injection valve comprising two coaxial valve needles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010035465A1 (en) * 1998-10-13 2001-11-01 Ronald D. Shinogle Fuel injector with rate shaping control through piezoelectric nozzle lift
DE10000027A1 (en) * 1999-02-10 2000-08-17 Caterpillar Inc Fuel injection device with controlled overflow, in which ram opens overflow passage to fuel compression chamber over part of distance
EP1164283A2 (en) * 2000-06-15 2001-12-19 Toyota Jidosha Kabushiki Kaisha A fuel injection valve
WO2004070192A1 (en) * 2003-02-05 2004-08-19 Robert Bosch Gmbh Fuel injection valve comprising two coaxial valve needles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2134956A1 (en) * 2007-03-09 2009-12-23 Robert Bosch GmbH Fuel injector comprising an improved control valve
CN116181537A (en) * 2023-02-08 2023-05-30 钧风电控科技(泰州)有限责任公司 Electromagnetic valve sinking offset double-oil-inlet-channel oil sprayer
CN116181537B (en) * 2023-02-08 2024-01-23 钧风电控科技(泰州)有限责任公司 Electromagnetic valve sinking offset double-oil-inlet-channel oil sprayer

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