EP1373714B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP1373714B1
EP1373714B1 EP02737752A EP02737752A EP1373714B1 EP 1373714 B1 EP1373714 B1 EP 1373714B1 EP 02737752 A EP02737752 A EP 02737752A EP 02737752 A EP02737752 A EP 02737752A EP 1373714 B1 EP1373714 B1 EP 1373714B1
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EP
European Patent Office
Prior art keywords
nozzle
nozzle body
centering
holding body
valve
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.)
Expired - Lifetime
Application number
EP02737752A
Other languages
German (de)
French (fr)
Other versions
EP1373714A1 (en
Inventor
Wolfgang Stoecklein
Dietmar Schmieder
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
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Filing date
Publication date
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Publication of EP1373714A1 publication Critical patent/EP1373714A1/en
Application granted granted Critical
Publication of EP1373714B1 publication Critical patent/EP1373714B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention is based on an injection valve, in particular for an internal combustion engine of a motor vehicle, according to the type defined in more detail in the preamble of patent claim 1.
  • Such a valve is known in practice and can be used in particular in conjunction with common rail accumulator injection systems for diesel internal combustion engines.
  • a known injection valve of the aforementioned type comprises a nozzle body in which a nozzle needle is guided axially displaceable and which has, for example, six defined openings, which lead to the combustion chamber of the internal combustion engine and are controlled by means of the nozzle needle.
  • the openings are in installation position of the injection valve arranged so that a defined injection angle and a defined injection direction are ensured.
  • the nozzle needle is actuated by means of a valve-like actuating device, which is arranged in a so-called holding body.
  • the actuating device may be equipped, for example, with a piezoelectric actuator unit which serves for the axial displacement of a so-called actuating piston, which cooperates via a hydraulic coupler with a so-called actuating piston, which in turn is connected to a valve closing member, that pressure changes are generated in a so-called valve control chamber can.
  • the pressure changes in the valve control chamber lead to an axial displacement of the nozzle needle, which in turn are released or closed the leading to the combustion chamber of the internal combustion engine openings.
  • the holding body has wrench surfaces which serve for fixing and adjusting the injection valve on a cylinder head of the internal combustion engine.
  • the holding body and the nozzle body have a defined orientation to each other. This has hitherto been ensured by centering pins arranged in bores of the holding body or of the nozzle body.
  • centering pin holes reduce the high-pressure resistance of the nozzle body, which can have a negative effect, in particular in the case of common rail injection valves in which pressures of up to 1.4 kbar prevail. Also cause bore tolerances of the centering pins receiving holes inaccurate angular centering of the nozzle body and holder body.
  • an injection valve which has a holding body and a nozzle body.
  • a flattening or a groove is formed, which serves to align the nozzle body relative to the holding body.
  • the injection valve according to the invention with the features according to the preamble of claim 1, wherein the nozzle body has on its peripheral surface means for attacking a centering tool, has the advantage that at least for angular orientation or angular centering of the nozzle body relative to the holding body cylinder pins omitted since the nozzle body can be aligned relative to the holding body by means of a centering tool which can be attached to the outside of the nozzle body.
  • the means for attacking a centering tool are formed as at least one planar surface, which is arranged on the circumference of the nozzle body.
  • a surface provides a simple way of attacking a correspondingly formed centering tool with at least one corresponding, engaging on the flat surface centering nose.
  • the nozzle body may have two planar surfaces arranged on opposite sides.
  • an embodiment with only one flat surface offers the advantage that the risk is low, the nozzle body relative to the holder body to rotate by 180 °, which would lead to a misalignment and would make the injector unusable.
  • the nozzle body on its peripheral surface with at least one groove or a blind hole-like bore into which a corresponding centering tool can engage.
  • the nozzle body and the holding body are connected to each other via a nozzle retaining nut.
  • the nozzle body has an increased wall thickness in the region which is covered by the nozzle retaining nut.
  • the means for attacking the centering tool are formed in this area, so that they are at least partially covered by the nozzle lock nut.
  • the pressure holding capacity of the injection valve by the means for the attack of the centering tool which may be formed, for example, as a ground surfaces guaranteed.
  • the nozzle body relative to the holding body can be aligned in an advantageous manner so that this surface is arranged parallel to key surfaces of the holding body. But it is also possible any other orientation that allows easy centering.
  • an injection valve 1 is shown, which is intended in particular for fuel injection into a diesel internal combustion engine.
  • the injection valve 1 comprises a valve control unit 2 and a nozzle unit 3 with a nozzle body 4, in which a nozzle needle 5 is arranged axially displaceable.
  • the nozzle body 4 has at its free end 6 a plurality of openings, not shown here, via which fuel can be injected into a combustion chamber of the internal combustion engine. Depending on the position of the nozzle needle 5, the openings are either opened or closed. On the position of the nozzle needle 5 so an injection process is triggered or stopped.
  • the injection valve 1 For actuating the nozzle needle 5, the injection valve 1, the valve control unit 2, which one with key surfaces Has 33 provided holding body 7 and a subsequent to the holding body 7 in the axial direction of the housing part 8.
  • the nozzle body 4, the housing part 8 and the holding body 7 are clamped together via a nozzle lock nut 9, which rests with a collar 10 on a shoulder 11 of the nozzle body 4 and is fixed by a thread 12 on the holding body 7.
  • the shoulder 11 and / or applied to the shoulder 11 surface of the collar 10 of the nozzle retaining nut 9 may be coated with a sliding material, such as Teflon, so that only a small torque is transmitted to the nozzle body 4 when tightening the nozzle retaining nut 9.
  • a piezoelectric actuator 14 and a connected to the piezoelectric actuator 13, so-called actuating piston 14 are arranged.
  • the piezoelectric actuator 13 is connected via electrical lines 15 with a valve control, not shown here.
  • the actuating piston 14 cooperates via a hydraulic coupler 15 with a so-called actuating piston 16, which is guided in the housing part 8 and is connected to a valve closing member 17.
  • the valve closing member 17 in turn cooperates with a valve seat 18.
  • valve control chamber 19 By actuating the valve closing member 16 by means of the piezoelectric actuator 13, the pressure level in a so-called valve control chamber 19 is adjustable, on the one hand from a spring plate 23, in which an inlet throttle 20 and a valve control unit 2 leading to the outlet throttle 22 are formed, and limited to the other by a valve control piston 24, which forms a structural unit with the nozzle needle 5 and axially displaceable in the spring plate 23 is executed.
  • An axial offset of the valve control piston 24 and thus the nozzle needle 5 can be adjusted via a change in the pressure level in the valve control chamber 19.
  • the inlet throttle 20 connects a high-pressure chamber 21, in which fuel is provided for injection into the combustion chamber of the internal combustion engine, with the valve control chamber 19.
  • An injection start, an injection duration and an injection amount via the openings arranged at the end 6 of the nozzle unit 3 are determined by means of the valve control unit 2.
  • valve closing member 18 In order to initiate an injection process, the valve closing member 18 is actuated by means of the piezoelectric actuator 13, whereby fuel can flow out of the valve control chamber 19 via the outlet throttle 22 and the pressure in the valve control chamber 19 drops. As a result, the valve spool 24 and the nozzle needle 5 connected therewith shifts so that the openings leading to the combustion chamber are released and fuel is injected into the combustion chamber. Accordingly, by closing the valve closing member 17, the injection process is stopped.
  • the nozzle body 4 has in the region of the annular collar 10 of the valve clamping nut 9, two flat surfaces 25 and 26, which are aligned in parallel.
  • the two surfaces 25 and 26 form so-called centering surfaces, which serve for the attachment of a centering tool 30.
  • the centering tool 30 has two centering lugs 31 and 32, each of which can be introduced into a gap between the annular collar 10 of the valve clamping nut 9 and the nozzle body 4 and thus rest against the centering surfaces 25 and 26, as in FIG FIG. 2 and FIG. 3 can be seen.
  • FIG. 3 is a cross section through the nozzle unit 3 and the centering tool 30 with the respective engaging in a gap centering lugs 31 and 32 can be seen. In this view, the nozzle lock nut 9 is not shown.
  • the centering of the nozzle body 4, i. the angular orientation of the nozzle body 4 relative to the holding body 7 is achieved in that the nozzle body 4 by means of the centering tool 30, which rests on the centering surfaces 31 and 32 on the centering surfaces 25 and 26, relative to the holding body 7 is rotated so that the centering surfaces 25 and 26 and the key surfaces 33 which are formed on the holding body 7, each occupy the prescribed and required angular position.
  • FIGS. 4 and 5 an alternative embodiment of a centering tool 40 is shown, by means of which a nozzle body not shown here can be rotated relative to a holding body of an injection valve and thus aligned.
  • the centering tool 40 is constructed cup-shaped and has an axially aligned bore 41, so that the centering tool can be plugged onto the nozzle body.
  • the bore 41 of the centering tool 40 has a conical surface 42 formed in the manner of an attachment, which merges into an axially aligned planar surface 43.
  • the centering tool 40 is placed on the nozzle body, which is pre-assembled via a valve clamping nut with the holding body, so that on the conical surface 42 corresponding to the nozzle body cone surface and on the flat surface 43 a corresponding to the nozzle body abut trained so-called centering nose.
  • the nozzle body in this case has only one centering nose.
  • the centering tool 40 is rotated in the circumferential direction until the prescribed angular position is assumed between the nozzle body and the holding body. Then the valve clamping nut tightened, so that the nozzle body and the holding body are rotatably connected to each other.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Dram (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

An injection valve for an internal combustion engine including at least a nozzle body, in which a nozzle needle is guided axially displaceably, and an at least one-piece retaining body, in which means for actuating the nozzle needle are disposed. On its circumferential surface, the nozzle body has means for engagement of a centering tool.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Einspritzventil, insbesondere für eine Verbrennungsmaschine eines Kraftfahrzeuges, gemäß der im Oberbegriff des Patentanspruches 1 näher definierten Art aus.The invention is based on an injection valve, in particular for an internal combustion engine of a motor vehicle, according to the type defined in more detail in the preamble of patent claim 1.

Ein derartiges Ventil ist aus der Praxis bekannt und kann insbesondere in Verbindung mit Common-Rail-Speichereinspritzsystemen für Dieselverbrennungsmaschinen eingesetzt werden.Such a valve is known in practice and can be used in particular in conjunction with common rail accumulator injection systems for diesel internal combustion engines.

Ein bekanntes Einspritzventil der einleitend genannte Art umfaßt einen Düsenkörper, in dem eine Düsennadel axial verschiebbar geführt ist und der beispielsweise sechs definiert angeordnete Öffnungen aufweist, welche zu dem Verbrennungsraum der Verbrennungsmaschine führen und mittels der Düsennadel gesteuert sind. Die Öffnungen sind in Einbaulage des Einspritzventils so angeordnet, daß ein definierter Einspritzwinkel und eine definierte Einspritzrichtung gewährleistet sind.A known injection valve of the aforementioned type comprises a nozzle body in which a nozzle needle is guided axially displaceable and which has, for example, six defined openings, which lead to the combustion chamber of the internal combustion engine and are controlled by means of the nozzle needle. The openings are in installation position of the injection valve arranged so that a defined injection angle and a defined injection direction are ensured.

Die Düsennadel ist mittels einer ventilartig ausgebildeten Betätigungsvorrichtung ansteuerbar, die in einem sogenannten Haltekörper angeordnet ist. Die Betätigungsvorrichtung kann beispielsweise mit einer piezoelektrischen Aktuator-Einheit ausgestattet sein, die zur axialen Verschiebung eines sogenannten Stellkolbens dient, welcher über einen hydraulischen Koppler mit einem sogenannten Betätigungskolben zusammenwirkt, der wiederum so mit einem Ventilschließglied verbunden ist, daß Druckänderungen in einem sogenannten Ventilsteuerraum erzeugt werden können. Die Druckänderungen in dem Ventilsteuerraum führen zu einer axialen Verschiebung der Düsennadel, wodurch wiederum die zu dem Verbrennungsraum der Verbrennungsmaschine führenden Öffnungen freigegeben bzw. verschlossen werden.The nozzle needle is actuated by means of a valve-like actuating device, which is arranged in a so-called holding body. The actuating device may be equipped, for example, with a piezoelectric actuator unit which serves for the axial displacement of a so-called actuating piston, which cooperates via a hydraulic coupler with a so-called actuating piston, which in turn is connected to a valve closing member, that pressure changes are generated in a so-called valve control chamber can. The pressure changes in the valve control chamber lead to an axial displacement of the nozzle needle, which in turn are released or closed the leading to the combustion chamber of the internal combustion engine openings.

Der Haltekörper weist in der Regel Schlüsselflächen auf, welche zur Fixierung und Justierung des Einspritzventils an einem Zylinderkopf der Verbrennungsmaschine dienen. Um einen definierten Einspritzwinkel einstellen zu können, muß gewährleistet sein, daß der Haltekörper und der Düsenkörper eine definierte Orientierung zueinander aufweisen. Dies wird bisher durch in Bohrungen des Haltekörpers bzw. des Düsenkörpers angeordnete Zentrierstifte gewährleistet.As a rule, the holding body has wrench surfaces which serve for fixing and adjusting the injection valve on a cylinder head of the internal combustion engine. In order to set a defined injection angle, it must be ensured that the holding body and the nozzle body have a defined orientation to each other. This has hitherto been ensured by centering pins arranged in bores of the holding body or of the nozzle body.

Solche Zentrierstifte sind jedoch schlecht montierbar und können beim Anziehen einer den Haltekörper und den Düsenkörper miteinander verbindenden Düsenspannmutter abgeschert werden.However, such centering pins are difficult to install and can when tightening the holding body and the nozzle body sheared together connecting nozzle retaining nut.

Des weiteren verringern die Zentrierstiftbohrungen die Hochdruckfestigkeit des Düsenkörpers, was sich insbesondere bei Common-Rail-Einspritzventilen, in welchen Drücke bis zu 1,4 kbar herrschen, negativ auswirken kann. Auch verursachen Bohrungstoleranzen der die Zentrierstifte aufnehmenden Bohrungen eine ungenaue Winkelzentrierung von Düsenkörper und Haltekörper.Furthermore, the centering pin holes reduce the high-pressure resistance of the nozzle body, which can have a negative effect, in particular in the case of common rail injection valves in which pressures of up to 1.4 kbar prevail. Also cause bore tolerances of the centering pins receiving holes inaccurate angular centering of the nozzle body and holder body.

Aus der EP 0 921 304 A2 ist ein Einspritzventil bekannt, das einen Haltekörper und einen Düsenkörper aufweist. Am Düsenkörper ist eine Abflachung oder eine Nut ausgebildet, die zur Ausrichtung des Düsenkörpers gegenüber dem Haltekörper dient.From the EP 0 921 304 A2 an injection valve is known which has a holding body and a nozzle body. On the nozzle body, a flattening or a groove is formed, which serves to align the nozzle body relative to the holding body.

Vorteile der ErfindungAdvantages of the invention

Das Einspritzventil nach der Erfindung mit den Merkmalen nach dem Oberbegriff des Patentanspruches 1, bei welchem der Düsenkörper an seiner Umfangsfläche Mittel zum Angriff eines Zentrierwerkzeugs aufweist, hat demgegenüber den Vorteil, daß zumindest zur Winkelorientierung bzw. Winkelzentrierung des Düsenkörpers gegenüber dem Haltekörper Zylinderstifte entfallen, da der Düsenkörper mittels eines an der Außenseite des Düsenkörpers ansetzbaren Zentrierwerkzeugs gegenüber dem Haltekörper ausgerichtet werden kann.The injection valve according to the invention with the features according to the preamble of claim 1, wherein the nozzle body has on its peripheral surface means for attacking a centering tool, has the advantage that at least for angular orientation or angular centering of the nozzle body relative to the holding body cylinder pins omitted since the nozzle body can be aligned relative to the holding body by means of a centering tool which can be attached to the outside of the nozzle body.

Eine derartige Orientierung bzw. Zentrierung ist problemlos und mit hoher Präzision durchführbar, so daß gegenüber den Einspritzventilen nach dem Stand der Technik eine erleichterte und verbesserte Montage des Einspritzventils gewährleistet ist.Such orientation or centering is easily and with high precision feasible, so that compared to the injectors of the prior art, a facilitated and improved assembly of the injector is ensured.

Auch ergibt sich dadurch, daß die Bohrungen für die Zentrierstifte zumindest teilweise entfallen, der Vorteil einer erhöhten Hochdruckfestigkeit des Düsenkörpers.Also results from the fact that the holes for the centering omitted at least partially, the advantage of increased high pressure resistance of the nozzle body.

Erfindungsgemäß sind die Mittel zum Angriff eines zentrierwerkzeugs als mindestens eine plane Fläche ausgebildet, die am Umfang des Düsenkörpers angeordnet ist. Eine derartige Fläche bietet eine einfache Möglichkeit zum Angriff eines korrespondierend ausgebildeten Zentrierwerkzeugs mit mindestens einer entsprechenden, an der planen Fläche angreifenden Zentriernase. Beispielsweise kann der Düsenkörper zwei an gegenüberliegenden Seiten angeordnete plane Flächen aufweisen.According to the invention, the means for attacking a centering tool are formed as at least one planar surface, which is arranged on the circumference of the nozzle body. Such a surface provides a simple way of attacking a correspondingly formed centering tool with at least one corresponding, engaging on the flat surface centering nose. For example, the nozzle body may have two planar surfaces arranged on opposite sides.

Eine Ausführungsform mit nur einer planen Fläche bietet aber demgegenüber den Vorteil, daß die Gefahr gering ist, den Düsenkörper gegenüber dem Haltekörper um 180° zu verdrehen, was zu einer Fehlorientierung führen und das Einspritzventil unbrauchbar machen würde.However, an embodiment with only one flat surface offers the advantage that the risk is low, the nozzle body relative to the holder body to rotate by 180 °, which would lead to a misalignment and would make the injector unusable.

Es ist aber auch denkbar, den Düsenkörper an seiner Umfangsfläche mit mindestens einer Nut oder einer sacklochartigen Bohrung zu versehen, in welche ein entsprechendes Zentrierwerkzeug eingreifen kann.But it is also conceivable to provide the nozzle body on its peripheral surface with at least one groove or a blind hole-like bore into which a corresponding centering tool can engage.

Der Düsenkörper und der Haltekörper sind über eine Düsenspannmutter miteinander verbunden. In der Regel weist der Düsenkörper in dem Bereich, der von der Düsenspannmutter überdeckt wird, eine erhöhte Wandstärke auf. Um die Hochdruckfestigkeit des Düsenkörpers nicht zu beeinträchtigen, sind daher die Mittel zum Angriff des Zentrierwerkzeugs in diesem Bereich ausgebildet, so daß sie von der Düsenspannmutter zumindest teilweise überdeckt sind. Damit ist das Druckhaltevermögen des Einspritzventils durch die Mittel zum Angriff des Zentrierwerkzeugs, welche beispielsweise als angeschliffene Flächen ausgebildet sein können, gewährleistet.The nozzle body and the holding body are connected to each other via a nozzle retaining nut. As a rule, the nozzle body has an increased wall thickness in the region which is covered by the nozzle retaining nut. In order not to impair the high pressure resistance of the nozzle body, Therefore, the means for attacking the centering tool are formed in this area, so that they are at least partially covered by the nozzle lock nut. Thus, the pressure holding capacity of the injection valve by the means for the attack of the centering tool, which may be formed, for example, as a ground surfaces guaranteed.

Wenn die Mittel zum Angriff eines Zentrierwerkzeugs als mindestens eine plane Fläche ausgebildet sind, kann der Düsenkörper gegenüber dem Haltekörper in vorteilhafter Weise so ausgerichtet sein, daß diese Fläche parallel zu Schlüsselflächen des Haltekörpers angeordnet ist. Es ist aber auch jede andere Orientierung denkbar, die eine problemlose zentrierung ermöglicht.If the means for attacking a centering tool are formed as at least one planar surface, the nozzle body relative to the holding body can be aligned in an advantageous manner so that this surface is arranged parallel to key surfaces of the holding body. But it is also possible any other orientation that allows easy centering.

Weitere Vorteile und vorteilhafte Weiterbildungen des Gegenstandes nach der Erfindung ergeben sich aus der Beschreibung, der Zeichnung und den Patentansprüchen.Further advantages and advantageous developments of the subject matter of the invention will become apparent from the description, the drawings and the claims.

Zeichnungdrawing

Ein Ausführungsbeispiel des Einspritzventils nach der Erfindung ist in der Zeichnung schematisch vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen

  • Figur 1 einen schematisierten Längsschnitt durch ein Einspritzventil,
  • Figur 2 einen Ausschnitt des Einspritzventils nach Figur 1. gemäß dem in Figur 1 ersichtlichen Bereich II in einer vergrößerten Darstellung zusammen mit einem Zentrierwerkzeug,
  • Figur 3 einen vereinfachten Querschnitt durch das Einspritzventil nach den Figuren 1 und 2 entlang der Linie III-III in der Figur 2,
  • Figur 4 eine vereinfachte Darstellung eines Zentrierwerkzeugs im Längsschnitt, und
  • Figur 5 eine Draufsicht auf das Zentrierwerkzeug der Figur 4 gemäß dem Pfeil V in Figur 4.
An embodiment of the injection valve according to the invention is shown schematically simplified in the drawing and will be explained in more detail in the following description. Show it
  • FIG. 1 a schematic longitudinal section through an injection valve,
  • FIG. 2 a section of the injector after FIG. 1 , according to the in FIG. 1 apparent area II in an enlarged view together with a centering tool,
  • FIG. 3 a simplified cross section through the injector after the FIGS. 1 and 2 along the line III-III in the FIG. 2 .
  • FIG. 4 a simplified representation of a centering tool in longitudinal section, and
  • FIG. 5 a plan view of the centering of the FIG. 4 according to the arrow V in FIG. 4 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Zeichnung ist ein Einspritzventil 1 dargestellt, das insbesondere zur Kraftstoffeinspritzung in eine Dieselverbrennungsmaschine bestimmt ist. Das Einspritzventil 1 umfaßt eine Ventilsteuereinheit 2 und eine Düseneinheit 3 mit einem Düsenkörper 4, in dem eine Düsennadel 5 axial verschiebbar angeordnet ist.In the drawing, an injection valve 1 is shown, which is intended in particular for fuel injection into a diesel internal combustion engine. The injection valve 1 comprises a valve control unit 2 and a nozzle unit 3 with a nozzle body 4, in which a nozzle needle 5 is arranged axially displaceable.

Der Düsenkörper 4 hat an seinem freien Ende 6 mehrere, hier nicht dargestellte Öffnungen, über die Kraftstoff in einen Verbrennungsraum der Verbrennungsmaschine eingespritzt werden kann. In Abhängigkeit von der Lage der Düsennadel 5 sind die Öffnungen entweder geöffnet oder verschlossen. Über die Lage der Düsennadel 5 wird also ein Einspritzvorgang ausgelöst bzw. gestoppt.The nozzle body 4 has at its free end 6 a plurality of openings, not shown here, via which fuel can be injected into a combustion chamber of the internal combustion engine. Depending on the position of the nozzle needle 5, the openings are either opened or closed. On the position of the nozzle needle 5 so an injection process is triggered or stopped.

Zur Betätigung der Düsennadel 5 weist das Einspritzventil 1 die Ventilsteuereinheit 2 auf, welcher einen mit Schlüsselflächen 33 versehenen Haltekörper 7 sowie ein sich an den Haltekörper 7 in axialer Richtung anschließendes Gehäuseteil 8 aufweist.For actuating the nozzle needle 5, the injection valve 1, the valve control unit 2, which one with key surfaces Has 33 provided holding body 7 and a subsequent to the holding body 7 in the axial direction of the housing part 8.

Der Düsenkörper 4, das Gehäuseteil 8 und der Haltekörper 7 sind über eine Düsenspannmutter 9 miteinander verspannt, welche mit einem Bund 10 an einer Schulter 11 des Düsenkörpers 4 anliegt und über ein Gewinde 12 an dem Haltekörper 7 fixiert ist. Die Schulter 11 und/oder die an der Schulter 11 anliegende Fläche des Bundes 10 der Düsenspannmutter 9 kann mit einem Gleitmaterial, beispielsweise Teflon, beschichtet sein, so daß beim Anziehen der Düsenspannmutter 9 nur ein geringes Drehmoment auf den Düsenkörper 4 übertragen wird.The nozzle body 4, the housing part 8 and the holding body 7 are clamped together via a nozzle lock nut 9, which rests with a collar 10 on a shoulder 11 of the nozzle body 4 and is fixed by a thread 12 on the holding body 7. The shoulder 11 and / or applied to the shoulder 11 surface of the collar 10 of the nozzle retaining nut 9 may be coated with a sliding material, such as Teflon, so that only a small torque is transmitted to the nozzle body 4 when tightening the nozzle retaining nut 9.

In dem Haltekörper 7 der Ventilsteuereinheit 2 sind ein piezoelektrischer Aktor 14 sowie ein mit dem piezoelektrischen Aktor 13 verbundener, sogenannter Stellkolben 14 angeordnet. Der piezoelektrische Aktor 13 ist über elektrische Leitungen 15 mit einer hier nicht dargestellten Ventilsteuerung verbunden.In the holding body 7 of the valve control unit 2, a piezoelectric actuator 14 and a connected to the piezoelectric actuator 13, so-called actuating piston 14 are arranged. The piezoelectric actuator 13 is connected via electrical lines 15 with a valve control, not shown here.

Der Stellkolben 14 wirkt über einen hydraulischen Koppler 15 mit einem sogenannten Betätigungskolben 16 zusammen, welcher in dem Gehäuseteil 8 geführt ist und mit einem Ventilschließglied 17 verbunden ist. Das Ventilschließglied 17 wirkt wiederum mit einem Ventilsitz 18 zusammen.The actuating piston 14 cooperates via a hydraulic coupler 15 with a so-called actuating piston 16, which is guided in the housing part 8 and is connected to a valve closing member 17. The valve closing member 17 in turn cooperates with a valve seat 18.

Durch Betätigung des Ventilschließglieds 16 mittels des piezoelektrischen Aktors 13 ist das Druckniveau in einem sogenannten Ventilsteuerraum 19 einstellbar, der zum einen von einem Federteller 23, in welchem eine Zulaufdrossel 20 und eine zu der Ventilsteuereinheit 2 führende Ablaufdrossel 22 ausgebildet sind, und zum anderen von einem Ventilsteuerkolben 24 begrenzt, welcher mit der Düsennadel 5 eine Baueinheit bildet und axial verschiebbar in dem Federteller 23 ausgeführt ist. Ein axialer Versatz des Ventilsteuerkolbens 24 und damit der Düsennadel 5 kann über eine Änderung des Druckniveaus in dem Ventilsteuerraum 19 eingestellt werden.By actuating the valve closing member 16 by means of the piezoelectric actuator 13, the pressure level in a so-called valve control chamber 19 is adjustable, on the one hand from a spring plate 23, in which an inlet throttle 20 and a valve control unit 2 leading to the outlet throttle 22 are formed, and limited to the other by a valve control piston 24, which forms a structural unit with the nozzle needle 5 and axially displaceable in the spring plate 23 is executed. An axial offset of the valve control piston 24 and thus the nozzle needle 5 can be adjusted via a change in the pressure level in the valve control chamber 19.

Die Zulaufdrossel 20 verbindet einen Hochdruckraum 21, in welchem zur Einspritzung in den Verbrennungsraum der Verbrennungsmaschine vorgesehener Kraftstoff enthalten ist, mit dem Ventilsteuerraum 19.The inlet throttle 20 connects a high-pressure chamber 21, in which fuel is provided for injection into the combustion chamber of the internal combustion engine, with the valve control chamber 19.

Ein Einspritzbeginn, eine Einspritzdauer und eine Einspritzmenge über die an dem Ende 6 der Düseneinheit 3 angeordneten Öffnungen wird mittels der Ventilsteuereinheit 2 festgelegt.An injection start, an injection duration and an injection amount via the openings arranged at the end 6 of the nozzle unit 3 are determined by means of the valve control unit 2.

Um einen Einspritzvorgang auszulösen, wird das Ventilschließglied 18 mittels des piezoelektrischen Aktors 13 betätigt, wodurch Kraftstoff aus dem Ventilsteuerraum 19 über die Ablaufdrossel 22 abströmen kann und der Druck in dem Ventilsteuerraum 19 abfällt. Dadurch verschiebt sich der Ventilsteuerkolben 24 und die mit diesem verbundene Düsennadel 5, so daß die zu dem Verbrennungsraum führenden Öffnungen freigegeben werden und Kraftstoff in den Verbrennungsraum eingespritzt wird. Entsprechend wird durch Schließen des Ventilschließglieds 17 der Einspritzvorgang gestoppt.In order to initiate an injection process, the valve closing member 18 is actuated by means of the piezoelectric actuator 13, whereby fuel can flow out of the valve control chamber 19 via the outlet throttle 22 and the pressure in the valve control chamber 19 drops. As a result, the valve spool 24 and the nozzle needle 5 connected therewith shifts so that the openings leading to the combustion chamber are released and fuel is injected into the combustion chamber. Accordingly, by closing the valve closing member 17, the injection process is stopped.

Der Düsenkörper 4 weist im Bereich des Ringbundes 10 der Ventilspannmutter 9 zwei plane Flächen 25 und 26 auf, die parallel ausgerichtet sind. Die beiden Flächen 25 und 26 bilden sogenannte Zentrierflächen, die zum Ansetzen eines Zentrierwerkzeugs 30 dienen. Hierzu weist das Zentrierwerkzeug 30 zwei Zentriernasen 31 und 32 auf, die jeweils in einen Spalt zwischen dem Ringbund 10 der Ventilspannmutter 9 und dem Düsenkörper 4 einführbar sind und so an den Zentrierflächen 25 und 26 anliegen, wie in Figur 2 und Figur 3 zu erkennen ist.The nozzle body 4 has in the region of the annular collar 10 of the valve clamping nut 9, two flat surfaces 25 and 26, which are aligned in parallel. The two surfaces 25 and 26 form so-called centering surfaces, which serve for the attachment of a centering tool 30. For this purpose, the centering tool 30 has two centering lugs 31 and 32, each of which can be introduced into a gap between the annular collar 10 of the valve clamping nut 9 and the nozzle body 4 and thus rest against the centering surfaces 25 and 26, as in FIG FIG. 2 and FIG. 3 can be seen.

Der Figur 3 ist ein Querschnitt durch die Düseneinheit 3 und das Zentrierwerkzeug 30 mit den jeweils in einen Spalt eingreifenden Zentriernasen 31 und 32 zu entnehmen. Bei dieser Ansicht ist die Düsenspannmutter 9 nicht dargestellt.Of the FIG. 3 is a cross section through the nozzle unit 3 and the centering tool 30 with the respective engaging in a gap centering lugs 31 and 32 can be seen. In this view, the nozzle lock nut 9 is not shown.

Die Zentrierung des Düsenkörpers 4, d.h. die Winkelorientierung des Düsenkörpers 4 gegenüber dem Haltekörper 7 wird dadurch erreicht, daß der Düsenkörper 4 mittels des Zentrierwerkzeugs 30, das über die Zentriernasen 31 und 32 an den Zentrierflächen 25 und 26 anliegt, gegenüber dem Haltekörper 7 so verdreht wird, daß die Zentrierflächen 25 und 26 und die Schlüsselflächen 33, die an dem Haltekörper 7 ausgebildet sind, die jeweils vorgeschriebene und erforderliche Winkelstellung einnehmen.The centering of the nozzle body 4, i. the angular orientation of the nozzle body 4 relative to the holding body 7 is achieved in that the nozzle body 4 by means of the centering tool 30, which rests on the centering surfaces 31 and 32 on the centering surfaces 25 and 26, relative to the holding body 7 is rotated so that the centering surfaces 25 and 26 and the key surfaces 33 which are formed on the holding body 7, each occupy the prescribed and required angular position.

Durch die Ausbildung der Zentrierflächen 25 und 26 an der Außenseite des Düsenkörpers 4 und des dadurch möglichen Angriffs des Zentrierwerkzeugs 30 kann auf Zentrierstifte zwischen dem Düsenkörper 4 und dem Gehäuseteil 8 verzichtet werden.Due to the formation of the centering surfaces 25 and 26 on the outside of the nozzle body 4 and thereby possible attack of the centering tool 30 can on centering pins be dispensed with between the nozzle body 4 and the housing part 8.

In den Figuren 4 und 5 ist eine alternative Ausführungsform eines Zentrierwerkzeugs 40 dargestellt, mittels dessen ein hier nicht dargestellter Düsenkörper gegenüber einem Haltekörper eines Einspritzventils verdreht und damit ausgerichtet werden kann.In the FIGS. 4 and 5 an alternative embodiment of a centering tool 40 is shown, by means of which a nozzle body not shown here can be rotated relative to a holding body of an injection valve and thus aligned.

Das Zentrierwerkzeug 40 ist becherförmig aufgebaut und weist eine axial ausgerichtete Bohrung 41 auf, so daß das Zentrierwerkzeug auf den Düsenkörper gesteckt werden kann. Im Mündungsbereich weist die Bohrung 41 des Zentrierwerkzeugs 40 eine nach Art einer Anfassung ausgebildete Kegelfläche 42 auf, die in eine axial ausgerichtete ebene Fläche 43 übergeht.The centering tool 40 is constructed cup-shaped and has an axially aligned bore 41, so that the centering tool can be plugged onto the nozzle body. In the mouth region, the bore 41 of the centering tool 40 has a conical surface 42 formed in the manner of an attachment, which merges into an axially aligned planar surface 43.

Zum Zentrieren des Düsenkörpers gegenüber dem Haltekörper wird das Zentrierwerkzeug 40 auf den Düsenkörper gesteckt, welcher über eine Ventilspannmutter mit dem Haltekörper vormontiert ist, so daß an der Kegelfläche 42 eine an dem Düsenkörper korrespondierend ausgebildete Kegelfläche und an der ebenen Fläche 43 eine an dem Düsenkörper korrespondierend ausgebildete sogenannte Zentriernase anliegen. Der Düsenkörper hat in diesem Fall nur eine Zentriernase.For centering the nozzle body relative to the holding body, the centering tool 40 is placed on the nozzle body, which is pre-assembled via a valve clamping nut with the holding body, so that on the conical surface 42 corresponding to the nozzle body cone surface and on the flat surface 43 a corresponding to the nozzle body abut trained so-called centering nose. The nozzle body in this case has only one centering nose.

In einem nachfolgenden Schritt wird das Zentrierwerkzeug 40 so lange in Umfangsrichtung verdreht, bis zwischen dem Düsenkörper und dem Haltekörper die vorgeschriebene Winkelstellung eingenommen ist. Anschließend wird die Ventilspannmutter angezogen, so daß der Düsenkörper und der Haltekörper drehfest miteinander verbunden sind.In a subsequent step, the centering tool 40 is rotated in the circumferential direction until the prescribed angular position is assumed between the nozzle body and the holding body. Then the valve clamping nut tightened, so that the nozzle body and the holding body are rotatably connected to each other.

Claims (2)

  1. Injection valve, in particular for an internal combustion engine, at least comprising a nozzle body (4) in which a nozzle needle (5) is guided axially displaceably, and also an at least one-part holding body (7) in which means for actuating the nozzle needle (5) are arranged, the nozzle body (4) having, on its circumferential face, at least one planar face (25, 26) for the engagement of a centring tool (30), characterized in that the nozzle body (4) and the holding body (7) are connected to one another via a nozzle tension nut (9) which at least partially covers the at least one planar face (25, 26).
  2. Method for mounting an injection valve, in particular for an internal combustion engine, at least comprising a nozzle body (4) in which a nozzle needle (5) is guided axially displaceably, and also an at least one-part holding body (7) in which means for actuating the nozzle needle (5) are arranged, the nozzle body (4) having on its circumferential face, at least one planar face (25, 26) for the engagement of a centring tool (30), and the nozzle body (4) and holding body (7) being connected to one another via a nozzle tension nut (9) which at least partially covers the at least one planar face (25, 26), the holding body (7) having at least two spanner faces (33), characterized in that the at least two spanner faces (33) are oriented essentially parallel to the at least one planar face (25, 26)
EP02737752A 2001-03-29 2002-03-26 Injection valve Expired - Lifetime EP1373714B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10115649 2001-03-29
DE10115649 2001-03-29
PCT/DE2002/001092 WO2002079636A1 (en) 2001-03-29 2002-03-26 Injection valve

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EP1373714A1 EP1373714A1 (en) 2004-01-02
EP1373714B1 true EP1373714B1 (en) 2010-07-28

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EP (1) EP1373714B1 (en)
JP (1) JP2004518895A (en)
AT (1) ATE475803T1 (en)
DE (2) DE10139622B4 (en)
HU (1) HUP0302417A3 (en)
WO (1) WO2002079636A1 (en)

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DE102004011455A1 (en) * 2003-06-04 2004-12-30 Robert Bosch Gmbh Bourdon tube for actuator and method for assembling the Bourdon tube
ES2355146T3 (en) * 2004-02-25 2011-03-23 Ganser-Hydromag Ag FUEL INJECTION VALVE FOR AN INTERNAL COMBUSTION MACHINE.
DE102005015735A1 (en) * 2005-04-06 2006-10-12 Robert Bosch Gmbh Fuel injector
CH697562B1 (en) * 2005-08-09 2008-11-28 Ganser Hydromag Fuel injection valve.
DE102007045948B3 (en) * 2007-09-25 2008-09-25 L'orange Gmbh Mounting device for modular injector of internal combustion engine, has injector housing and nozzle body, which is connected with injector housing over axial overlapping of nozzle nut
DE102011051903A1 (en) 2011-07-18 2012-10-31 L'orange Gmbh Fuel injector has axially segmented housing structure with high- and low-side power supply connections, where hub-adjustable nozzle needle is accommodated in axial bore which is connected to high pressure side supply terminal
CN105563761A (en) * 2014-10-11 2016-05-11 柳道万和(苏州)热流道***有限公司 Novel cylinder
DE102017101999A1 (en) * 2017-02-01 2018-08-02 Firma L'orange Gmbh Fuel injection injector for an internal combustion engine

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HUP0302417A2 (en) 2003-10-28
DE50214552D1 (en) 2010-09-09
DE10139622A1 (en) 2002-10-02
DE10139622B4 (en) 2018-06-14
JP2004518895A (en) 2004-06-24
US7036754B2 (en) 2006-05-02
ATE475803T1 (en) 2010-08-15
WO2002079636A1 (en) 2002-10-10
US20030168527A1 (en) 2003-09-11
EP1373714A1 (en) 2004-01-02
HUP0302417A3 (en) 2007-02-28

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