EP1815129B1 - Fuel-injection nozzle - Google Patents

Fuel-injection nozzle Download PDF

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Publication number
EP1815129B1
EP1815129B1 EP05804616A EP05804616A EP1815129B1 EP 1815129 B1 EP1815129 B1 EP 1815129B1 EP 05804616 A EP05804616 A EP 05804616A EP 05804616 A EP05804616 A EP 05804616A EP 1815129 B1 EP1815129 B1 EP 1815129B1
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EP
European Patent Office
Prior art keywords
valve needle
throttle ring
throttle
valve
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.)
Not-in-force
Application number
EP05804616A
Other languages
German (de)
French (fr)
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EP1815129A1 (en
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1815129A1 publication Critical patent/EP1815129A1/en
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Publication of EP1815129B1 publication Critical patent/EP1815129B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • the valve needle axially displaceable in a bore of a nozzle body in the transition region of its conical sealing surface to its valve stem a throttle device with variable throttle cross-section through which the injection amount is variable depending on the opening stroke of the valve needle.
  • the throttle device comprises a throttle sleeve, which is axially displaceably guided against the restoring force of a spring in the annular space formed between the bore wall and the valve stem and is entrained by an opening movement of the valve needle.
  • the throttle sleeve is located with a conical end face on the outer annular surface of the conical valve seat surface of the Nozzle body and has in its conical end face at least one open towards the front side recess.
  • the throttle sleeve is not entrained by the valve needle, the injected amount of fuel through the formed in the conical end face recesses which perform the throttle function, out.
  • the throttle sleeve is entrained by the valve needle in the opening direction, it lifts off from the outer annular surface of the conical valve seat surface and thus releases an additional opening cross-section.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that through the throttle ring with integrated throttle in a simple manner, a fuel injector with injection rate shaping can be achieved.
  • a fuel injector with injection rate shaping can be achieved.
  • the opening stroke of the valve needle, from which the additional opening cross-section is to be released can be easily adjusted by a dial on which the throttle ring in the annular space rests on the housing side.
  • Fig. 1 the lower part of a fuel injection nozzle 1 for self-igniting internal combustion engines is shown.
  • the fuel injection nozzle 1 has a nozzle body 2 in which a conical valve seat surface 4 is formed at the bottom of a blind bore 3 , depart from the injection openings 5 in the combustion chamber of the internal combustion engine.
  • a valve needle 6 is axially displaceably guided, which at the combustion chamber end has a cooperating with the valve seat surface 4 , formed by two conical surfaces valve sealing surface 7 for closing and opening the injection openings 5.
  • annular chamber 8 is formed around the valve needle 6 around which is divided by a throttle ring 9 in an upstream part space 8a, which is connected to a fuel high-pressure line 10, and a downstream sub-chamber 8b, which extends up to the valve seat surface 4, is.
  • the throttle ring 9 is located on the bore wall 11 permanently tight and axially immovable and has a plurality of throttle openings 12 in the circumferential direction, which connect the two subspaces 8a, 8b with each other permanently.
  • the valve needle 6 has in the annular space 8 a throttle ring 9 in the closing direction of the valve needle 6 engages behind the annular shoulder 13, with which a sealing edge 14 of the throttle ring 9 cooperates.
  • the sealing edge 14 at the same time defines the annular opening 15 of the throttle ring 9, whose opening diameter is greater than the diameter of the downstream of the annular shoulder 13 adjoining shaft 16 of the valve needle 6.
  • the throttle ring 9 rests on a dial 17 , which in turn rests on an annular shoulder 18 of the nozzle body 2.
  • the throttle ring 9 is elastically deformable, thus forming an elastic spring element, so that its sealing edge 14 against its against the bore wall 11 and the shim 15 outer part is axially deflectable.
  • Fig. 1a the fuel injector 1 is shown in the closed position, in which the valve needle 6 rests with its valve sealing surface 7 on the valve seat surface 4.
  • the sealing edge 14 rests tight against the annular shoulder 13 of the valve needle 6 and is elastically deflected by the annular shoulder 13 in the closing direction of the valve needle 6, ie downwards.
  • the downstream subspace 8b is connected via the throttle openings 12 to the upstream subspace 8a, ie to the high-pressure fuel line 10.
  • valve needle 6 At the transition of the valve needle 6 from its in Fig. 1a shown, closed valve position in the Fig. 1c shown, fully open valve position (opening stroke h max) is the valve needle 6 to the in Fig. 1b shown opening stroke h 1 (h 1 ⁇ h max ) at the sealing edge 14 at. Up to this opening stroke h 1 , the sealing edge 14 is deflected by the annular shoulder 13 of the valve needle 6 down elastically and is sealingly against the valve needle 6 at. Therefore, until the opening stroke h 1, the amount of fuel injected via the now opened injection openings 5 is guided solely through the throttle bores 12.
  • the annular shoulder 13 lifts from the sealing edge 14 releasing the present between the valve needle 6 and throttle ring 9 ring opening 15, which represents an additional opening cross-section between the two sub-chambers 8a, 8b. Since the annular opening 15 has a smaller throttle resistance than all throttle bores together 12, from the opening stroke h 1, a larger amount of fuel is injected, which is mainly conducted through the annular opening 15. As shown in FIG. 3, starting from the opening stroke h 1, the sealing edge 14 forms the foremost part of the throttle ring 9 in the opening direction of the valve needle 6.
  • Fig. 2 are those elements that are in those Fig. 1 are identical, provided with the same reference numerals, so that reference is made to the description of these embodiments with respect to their description.
  • the in Fig. 2 shown throttle ring 20 is permanently close to the bore wall 11 and is in the annular space 8 relative to the valve needle 6 against the action of a spring formed as a tubular spring 21 in the closing direction of the valve needle 6, that is guided downwardly, axially displaceable.
  • the throttle ring 20 is displaceably guided both on the bore wall 11 by means of a guide element 22 and on the downstream of the annular shoulder 13 valve stem 16.
  • the valve stem 16 has on its guide surface a plurality of throttle ring 20 toward open recesses 23 in the form of axial grooves, which begin immediately at the annular shoulder 13 and whose axial length is greater than the ring thickness of the throttle ring 20.
  • the spring 21 is supported on the shim 17, which rests even on the annular shoulder 18.
  • Fig. 2a the fuel injector is shown in the closed position, in which the valve needle 6 rests with its valve sealing surface 7 on the valve seat surface 4.
  • the throttle ring 20 rests with its sealing edge 14 on the annular shoulder 13 of the valve needle 6 tight and is taken from the annular shoulder 13 in the closing direction of the valve needle 6, ie down, against the action of the spring 21.
  • the downstream subspace 8b is connected via the throttle openings 12 to the upstream subspace 8a, ie to the high-pressure fuel line 10.
  • the annular shoulder 13 lifts off from the sealing edge 14, releasing the recesses 23, which provide an additional Opening cross section between the two subspaces 8a, 8b represent. Since the recesses 23 have a lower throttle resistance than all the throttle bores together 12, a larger amount of fuel is injected from the opening stroke h 1 , which is mainly guided by the recesses 23.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel-injection nozzle (1) comprising an annular chamber (8) that surrounds a valve needle (6) in a bore (3), said chamber being divided into an upstream sub-chamber (8a) and a downstream sub-chamber (8b), which extends up to the valve seat surface, by a throttle ring (9) that comprises at least one throttle opening (12). At least one section of the throttle ring (9) is carried along by an axial displacement of the valve needle (6) in opposition to the action of a restoring force. According to the invention, the throttle ring (9) lies permanently against the bore wall (11), sealing the latter and has a sealing edge (14) that co-operates with the valve needle (6) and can be axially deflected. The valve needle (6) in the annular chamber (8) comprises a ring collar (13) that engages behind the throttle ring (9) in the closing direction of the valve needle (6). The sealing edge (14) lies against said collar until a specific opening length of stroke (h<SUB>1</SUB>) has been attained by the valve needle (6). Once said opening length of stroke (h<SUB>1</SUB>) has been attained, the ring collar is lifted from the sealing edge (14), forming an additional opening cross-section that interconnects the two sub-chambers (8a, 8b).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzdüse nach der Gattung des Patentanspruchs 1. Bei solch einer, z.B. durch die DE 197 55 057 A1 bekannten Kraftstoffeinspritzdüse weist die in einer Bohrung eines Düsenkörpers axial verschiebbare Ventilnadel im Übergangsbereich von ihrer konischen Dichtfläche zu ihrem Ventilschaft eine Drosseleinrichtung mit veränderbarem Drosselquerschnitt auf, durch welche abhängig vom Öffnungshub der Ventilnadel die Einspritzmenge variierbar ist. Die Drosseleinrichtung umfasst eine Drosselhülse, die in dem zwischen Bohrungswand und Ventilschaft gebildeten Ringraum entgegen der Rückstellkraft einer Feder axial verschiebbar geführt und durch eine Öffnungsbewegung der Ventilnadel mitnehmbar ist. Die Drosselhülse liegt mit einer konisch ausgebildeten Stirnseite an der äußeren Ringfläche der konischen Ventilsitzfläche des Düsenkörpers an und weist in ihrer konisch ausgebildeten Stirnseite wenigstens eine zur Stirnseite hin offene Ausnehmung auf. Solange die Drosselhülse nicht von der Ventilnadel mitgenommen wird, ist die eingespritzte Kraftstoffmenge durch die in der konischen Stirnseite ausgebildeten Ausnehmungen, welche die Drosselfunktion ausüben, geführt. Sobald die Drosselhülse von der Ventilnadel in Öffnungsrichtung mitgenommen wird, hebt sie von der äußeren Ringfläche der konischen Ventilsitztzfläche ab und gibt so einen zusätzlichen Öffnungsquerschnitt frei.The invention relates to a fuel injector according to the preamble of claim 1. In such a, for example by the DE 197 55 057 A1 known fuel injector, the valve needle axially displaceable in a bore of a nozzle body in the transition region of its conical sealing surface to its valve stem a throttle device with variable throttle cross-section through which the injection amount is variable depending on the opening stroke of the valve needle. The throttle device comprises a throttle sleeve, which is axially displaceably guided against the restoring force of a spring in the annular space formed between the bore wall and the valve stem and is entrained by an opening movement of the valve needle. The throttle sleeve is located with a conical end face on the outer annular surface of the conical valve seat surface of the Nozzle body and has in its conical end face at least one open towards the front side recess. As long as the throttle sleeve is not entrained by the valve needle, the injected amount of fuel through the formed in the conical end face recesses which perform the throttle function, out. As soon as the throttle sleeve is entrained by the valve needle in the opening direction, it lifts off from the outer annular surface of the conical valve seat surface and thus releases an additional opening cross-section.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, dass durch den Drosselring mit integrierter Drossel auf einfache Weise eine Kraftstoffeinspritzdüse mit Einspritzverlaufsformung erreicht werden kann. Bereits in Serie befindliche Kraftstoffeinspritzdüsen ohne Einspritzverlaufsformung können durch Einlegen des Drosselrings leicht nachgerüstet werden. Dabei kann der Öffnungshub der Ventilnadel, ab dem der zusätzliche Öffnungsquerschnitt freigegeben werden soll, leicht durch eine Einstellscheibe eingestellt werden, auf der der Drosselring im Ringraum gehäuseseitig anliegt.The fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that through the throttle ring with integrated throttle in a simple manner, a fuel injector with injection rate shaping can be achieved. Already in series fuel injectors without injection molding can be easily retrofitted by inserting the throttle ring. In this case, the opening stroke of the valve needle, from which the additional opening cross-section is to be released, can be easily adjusted by a dial on which the throttle ring in the annular space rests on the housing side.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the subject invention are the description, the drawings and claims removed.

Zeichnungdrawing

Zwei Ausführungsbeispiele der erfindungsgemäßen Kraftstoffeinspritzdüse sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fign.1a-1c
ein erstes Ausführungsbeispiel der erfindungsgemäßen Kraftstoffeinspritzdüse bei unterschiedlichen Öffnungshüben der Ventilnadel; und
Fign. 2a-2c
ein zweites Ausführungsbeispiel der erfindungsgemäßen Kraftstoffeinspritzdüse bei unterschiedlichen Öffnungshüben der Ventilnadel.
Two embodiments of the fuel injection nozzle according to the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:
Fign.1a-1c
a first embodiment of the fuel injection nozzle according to the invention at different opening strokes of the valve needle; and
FIGS. 2a-2c
A second embodiment of the fuel injection nozzle according to the invention at different opening strokes of the valve needle.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Fig. 1 ist der untere Bereich einer Kraftstoffeinspritzdüse 1 für selbstzündende Brennkraftmaschinen dargestellt. Die Kraftstoffeinspritzdüse 1 weist einen Düsenkörper 2 auf, bei dem im Grund einer Sackbohrung 3 eine konische Ventilsitzfläche 4 gebildet ist, von der Einspritzöffnungen 5 in den Brennraum der Brennkraftmaschine abgehen. In der Sackbohrung 3 ist eine Ventilnadel 6 axial verschiebbar geführt, die am brennraumseitigen Ende eine mit der Ventilsitzfläche 4 zusammenwirkende, durch zwei Konusflächen gebildete Ventildichtfläche 7 zum Schließen und Öffnen der Einspritzöffnungen 5 aufweist.In Fig. 1 the lower part of a fuel injection nozzle 1 for self-igniting internal combustion engines is shown. The fuel injection nozzle 1 has a nozzle body 2 in which a conical valve seat surface 4 is formed at the bottom of a blind bore 3 , depart from the injection openings 5 in the combustion chamber of the internal combustion engine. In the blind bore 3, a valve needle 6 is axially displaceably guided, which at the combustion chamber end has a cooperating with the valve seat surface 4 , formed by two conical surfaces valve sealing surface 7 for closing and opening the injection openings 5.

In der Bohrung 3 ist um die Ventilnadel 6 herum ein Ringraum 8 gebildet, der durch einen Drosselring 9 in einen stromaufwärtigen Teilraum 8a, welcher an eine Kraftstoffhochdruckleitung 10 angeschlossen ist, und einen stromabwärtigen Teilraum 8b, welcher sich bis an die Ventilsitzfläche 4 erstreckt, geteilt ist. Der Drosselring 9 liegt an der Bohrungswand 11 dauerhaft dicht und axial unverschiebbar an und weist in Umfangsrichtung mehrere Drosselöffnungen 12 auf, welche die beiden Teilräume 8a, 8b miteinander dauerhaft verbinden. Die Ventilnadel 6 hat im Ringraum 8 eine den Drosselring 9 in Schließrichtung der Ventilnadel 6 hintergreifende Ringschulter 13, mit der eine Dichtkante 14 des Drosselrings 9 zusammenwirkt. Die Dichtkante 14 definiert gleichzeitig die Ringöffnung 15 des Drosselrings 9, deren Öffnungsdurchmesser größer als der Durchmesser des sich stromabwärts an die Ringschulter 13 anschließenden Schaftes 16 der Ventilnadel 6 ist. Der Drosselring 9 liegt auf einer Einstellscheibe 17 auf, die wiederum auf einem Ringabsatz 18 des Düsenkörpers 2 aufliegt. Der Drosselring 9 ist elastisch verformbar, bildet also ein elastisches Federelement, so dass seine Dichtkante 14 gegenüber seinem an der Bohrungswand 11 und an der Einstellscheibe 15 anliegenden äußeren Teil axial auslenkbar ist.In the hole 3 an annular chamber 8 is formed around the valve needle 6 around which is divided by a throttle ring 9 in an upstream part space 8a, which is connected to a fuel high-pressure line 10, and a downstream sub-chamber 8b, which extends up to the valve seat surface 4, is. The throttle ring 9 is located on the bore wall 11 permanently tight and axially immovable and has a plurality of throttle openings 12 in the circumferential direction, which connect the two subspaces 8a, 8b with each other permanently. The valve needle 6 has in the annular space 8 a throttle ring 9 in the closing direction of the valve needle 6 engages behind the annular shoulder 13, with which a sealing edge 14 of the throttle ring 9 cooperates. The sealing edge 14 at the same time defines the annular opening 15 of the throttle ring 9, whose opening diameter is greater than the diameter of the downstream of the annular shoulder 13 adjoining shaft 16 of the valve needle 6. The throttle ring 9 rests on a dial 17 , which in turn rests on an annular shoulder 18 of the nozzle body 2. The throttle ring 9 is elastically deformable, thus forming an elastic spring element, so that its sealing edge 14 against its against the bore wall 11 and the shim 15 outer part is axially deflectable.

In Fig. 1a ist die Kraftstoffeinspritzdüse 1 in der geschlossenen Stellung gezeigt, in der die Ventilnadel 6 mit ihrer Ventildichtfläche 7 an der Ventilsitzfläche 4 anliegt. Die Dichtkante 14 liegt an der Ringschulter 13 der Ventilnadel 6 dicht an und ist von der Ringschulter 13 in Schließrichtung der Ventilnadel 6, d.h. nach unten, elastisch ausgelenkt. Der stromabwärtige Teilraum 8b ist über die Drosselöffnungen 12 mit dem stromaufwärtigen Teilraum 8a, d.h. mit der Kraftstoffhochdruckleitung 10, verbunden.In Fig. 1a the fuel injector 1 is shown in the closed position, in which the valve needle 6 rests with its valve sealing surface 7 on the valve seat surface 4. The sealing edge 14 rests tight against the annular shoulder 13 of the valve needle 6 and is elastically deflected by the annular shoulder 13 in the closing direction of the valve needle 6, ie downwards. The downstream subspace 8b is connected via the throttle openings 12 to the upstream subspace 8a, ie to the high-pressure fuel line 10.

Beim Übergang der Ventilnadel 6 aus ihrer in Fig. 1a gezeigten, geschlossenen Ventilstellung in die in Fig. 1c gezeigte, vollständig geöffnete Ventilstellung (Öffnungshub hmax) liegt die Ventilnadel 6 bis zu dem in Fig. 1b gezeigten Öffnungshub h1 (h1 < hmax) an der Dichtkante 14 an. Bis zu diesem Öffnungshub h1 ist die Dichtkante 14 durch die Ringschulter 13 der Ventilnadel 6 nach unten elastisch ausgelenkt und liegt dichtend an der Ventilnadel 6 an. Daher wird bis zum Öffnungshub h1 die über die nun freigegebenen Einspritzöffnungen 5 eingespritzte Kraftstoffmenge allein durch die Drosselbohrungen 12 geführt.At the transition of the valve needle 6 from its in Fig. 1a shown, closed valve position in the Fig. 1c shown, fully open valve position (opening stroke h max) is the valve needle 6 to the in Fig. 1b shown opening stroke h 1 (h 1 <h max ) at the sealing edge 14 at. Up to this opening stroke h 1 , the sealing edge 14 is deflected by the annular shoulder 13 of the valve needle 6 down elastically and is sealingly against the valve needle 6 at. Therefore, until the opening stroke h 1, the amount of fuel injected via the now opened injection openings 5 is guided solely through the throttle bores 12.

Ab einem Öffnungshub der Ventilnadel 6 größer als h1 hebt die Ringschulter 13 von der Dichtkante 14 unter Freigabe der zwischen Ventilnadel 6 und Drosselring 9 vorhandenen Ringöffnung 15 ab, die einen zusätzlichen Öffnungsquerschnitt zwischen beiden Teilräumen 8a, 8b darstellt. Da die Ringöffnung 15 einen geringeren Drosselwiderstand als alle Drosselbohrungen zusammen 12 hat, wird ab dem Öffnungshub h1 eine größere Kraftstoffmenge eingespritzt, die hauptsächlich durch die Ringöffnung 15 geführt ist. Wie in Fig. 3 gezeigt, bildet ab dem Öffnungshub h1 die Dichtkante 14 den in Öffnungsrichtung der Ventilnadel 6 vordersten Teil des Drosselrings 9.From an opening stroke of the valve needle 6 greater than h 1 , the annular shoulder 13 lifts from the sealing edge 14 releasing the present between the valve needle 6 and throttle ring 9 ring opening 15, which represents an additional opening cross-section between the two sub-chambers 8a, 8b. Since the annular opening 15 has a smaller throttle resistance than all throttle bores together 12, from the opening stroke h 1, a larger amount of fuel is injected, which is mainly conducted through the annular opening 15. As shown in FIG. 3, starting from the opening stroke h 1, the sealing edge 14 forms the foremost part of the throttle ring 9 in the opening direction of the valve needle 6.

Bis zum Öffnungshub h1 wirken nur die Drosselbohrungen 12, danach wird mit der Ringöffnung 15 ein größerer Durchflussquerschnitt geöffnet, so dass auf eine konstruktiv sehr einfache Weise eine Einspritzverlaufsformung an der Kraftstoffeinspritzdüse 1 erreicht wird. Durch schnelles Schließen der Ventilnadel 6 kann dies beim Schließvorgang fast vollständig unterdrückt werden.Until the opening stroke h 1 , only the throttle bores 12 act, and then a larger flow cross-section is opened with the annular opening 15, so that an injection profile is achieved at the fuel injector 1 in a structurally very simple manner. By quickly closing the valve needle 6, this can be almost completely suppressed during the closing process.

In Fig. 2 sind diejenigen Elemente, die mit denen in Fig. 1 identisch sind, mit denselben Bezugsziffern versehen, so dass bezüglich deren Beschreibung auf die Ausführungen zu diesen Ausführungsbeispielen Bezug genommen wird. Der in Fig. 2 gezeigte Drosselring 20 liegt dauerhaft dicht an der Bohrungswand 11 an und ist im Ringraum 8 relativ zur Ventilnadel 6 gegen die Wirkung einer als Rohrfeder ausgebildeten Feder 21 in Schließrichtung der Ventilnadel 6, d.h. nach unten, axial verschiebbar geführt. Dazu ist der Drosselring 20 sowohl an der Bohrungswand 11 mittels eines Führungselements 22 als auch auf dem sich stromabwärts an die Ringschulter 13 anschließenden Ventilschaft 16 verschiebbar geführt. Der Ventilschaft 16 weist an seiner Führungsfläche mehrere zum Drosselring 20 hin offene Ausnehmungen 23 in Form von axialen Nuten auf, die unmittelbar an der Ringschulter 13 beginnen und deren axiale Länge größer als die Ringstärke des Drosselrings 20 ist. Die Feder 21 ist auf der Einstellscheibe 17, die selbst auf dem Ringabsatz 18 aufliegt, abgestützt.In Fig. 2 are those elements that are in those Fig. 1 are identical, provided with the same reference numerals, so that reference is made to the description of these embodiments with respect to their description. The in Fig. 2 shown throttle ring 20 is permanently close to the bore wall 11 and is in the annular space 8 relative to the valve needle 6 against the action of a spring formed as a tubular spring 21 in the closing direction of the valve needle 6, that is guided downwardly, axially displaceable. For this purpose, the throttle ring 20 is displaceably guided both on the bore wall 11 by means of a guide element 22 and on the downstream of the annular shoulder 13 valve stem 16. The valve stem 16 has on its guide surface a plurality of throttle ring 20 toward open recesses 23 in the form of axial grooves, which begin immediately at the annular shoulder 13 and whose axial length is greater than the ring thickness of the throttle ring 20. The spring 21 is supported on the shim 17, which rests even on the annular shoulder 18.

In Fig. 2a ist die Kraftstoffeinspritzdüse in der geschlossenen Stellung gezeigt, in der die Ventilnadel 6 mit ihrer Ventildichtfläche 7 an der Ventilsitzfläche 4 anliegt. Der Drosselring 20 liegt mit seiner Dichtkante 14 an der Ringschulter 13 der Ventilnadel 6 dicht an und ist von der Ringschulter 13 in Schließrichtung der Ventilnadel 6, d.h. nach unten, gegen die Wirkung der Feder 21 mitgenommen. Der stromabwärtige Teilraum 8b ist über die Drosselöffnungen 12 mit dem stromaufwärtigen Teilraum 8a, d.h. mit der Kraftstoffhochdruckleitung 10, verbunden.In Fig. 2a the fuel injector is shown in the closed position, in which the valve needle 6 rests with its valve sealing surface 7 on the valve seat surface 4. The throttle ring 20 rests with its sealing edge 14 on the annular shoulder 13 of the valve needle 6 tight and is taken from the annular shoulder 13 in the closing direction of the valve needle 6, ie down, against the action of the spring 21. The downstream subspace 8b is connected via the throttle openings 12 to the upstream subspace 8a, ie to the high-pressure fuel line 10.

Beim Übergang der Ventilnadel 6 aus ihrer in Fig. 2a gezeigten, geschlossenen Ventilstellung in die in Fig. 2c gezeigte, vollständig geöffnete Ventilstellung (Öffnungshub hmax) liegt die Ventilnadel 6 bis zu dem in Fig. 2b gezeigten Öffnungshub h1 (h1 < hmax) an der Dichtkante 14 an. Bis zu diesem Öffnungshub h1 ist der Drosselring 20 durch die Ringschulter 13 der Ventilnadel 6 nach unten verschoben und liegt dichtend an der Ventilnadel 6 an. Daher wird bis zum Öffnungshub h1 die über die nun freigegebenen Einspritzöffnungen 5 eingespritzte Kraftstoffmenge allein durch die Drosselbohrungen 12 geführt.At the transition of the valve needle 6 from its in Fig. 2a shown, closed valve position in the Fig. 2c shown, fully open valve position (opening stroke h max) is the valve needle 6 to the in Fig. 2b shown opening stroke h 1 (h 1 <h max ) at the sealing edge 14 at. Up to this opening stroke h 1 , the throttle ring 20 is displaced downwards by the annular shoulder 13 of the valve needle 6 and bears sealingly against the valve needle 6. Therefore, until the opening stroke h 1, the amount of fuel injected via the now opened injection openings 5 is guided solely through the throttle bores 12.

Ab einem Öffnungshub der Ventilnadel 6 größer als h1 hebt die Ringschulter 13 von der Dichtkante 14 unter Freigabe der Ausnehmungen 23 ab, die einen zusätzlichen Öffnungsquerschnitt zwischen beiden Teilräumen 8a, 8b darstellen. Da die die Ausnehmungen 23 einen geringeren Drosselwiderstand als alle Drosselbohrungen zusammen 12 habe, wird ab dem Öffnungshub h1 eine größere Kraftstoffmenge eingespritzt, die hauptsächlich durch die Ausnehmungen 23 geführt ist.From an opening stroke of the valve needle 6 greater than h 1 , the annular shoulder 13 lifts off from the sealing edge 14, releasing the recesses 23, which provide an additional Opening cross section between the two subspaces 8a, 8b represent. Since the recesses 23 have a lower throttle resistance than all the throttle bores together 12, a larger amount of fuel is injected from the opening stroke h 1 , which is mainly guided by the recesses 23.

Claims (8)

  1. Fuel injection nozzle (1) for internal combustion engines, having a valve needle (6) which can be displaced axially in a hole (3) of a nozzle body (2) and has, at its end on the combustion-chamber side, a valve sealing face (7), by way of which it interacts with a valve seat face (4) of the nozzle body (2), having at least one injection opening (5) which is provided downstream of the valve seat face (4) and opens into the combustion chamber of the internal combustion engine to be supplied, and having an annular chamber (8) which is formed in the hole (3) around the valve needle (6) and is divided by a throttle ring (9; 20) which has at least one throttle opening (12) into an upstream part chamber (8a) which is connected to a high-pressure fuel line (10) and a downstream part chamber (8b) which extends as far as the valve seat face (4), at least one part of the throttle ring (9; 20) being driven axially by an axial movement of the valve needle (6) counter to the action of a restoring force, characterized in that the throttle ring (9; 20) bears sealingly against the hole wall (11) permanently and has a sealing edge (14) which interacts with the valve needle (6) and can be deflected axially, and in that the valve needle (6) in the annular chamber (8) has an annular shoulder (13) which engages behind the throttle ring (9; 20) in the closing direction of the valve needle (6) and against which the sealing edge (14) bears sealingly as far as a defined opening stroke (h1) of the valve needle (6), and which annular shoulder (13) is raised up from the sealing edge (14) after the defined opening stroke (h1) with the formation of an additional opening cross section which connects both part chambers (8a, 8b) to one another.
  2. Fuel injection valve according to Claim 1, characterized in that the throttle ring (9) bears against the hole wall (11) in an axially non-displaceable manner.
  3. Fuel injection valve according to Claim 2, characterized in that the sealing edge (14) of the throttle ring (9) can be deformed elastically with respect to its outer annular section which bears against the hole wall (11).
  4. Fuel injection valve according to Claim 2 or 3, characterized in that, after the defined opening stroke (h1) , the sealing edge (14) forms the foremost part of the throttle ring (9) in the opening direction of the valve needle (6) .
  5. Fuel injection valve according to one of Claims 2 to 4, characterized in that the throttle ring (9) rests on an annular step (18) of the nozzle body (2) or on an adjustment disc (17) which is arranged between the throttle ring (9) and the annular step (18).
  6. Fuel injection valve according to Claim 1, characterized in that the throttle ring (20) is guided in the annular chamber (8) such that it can be displaced axially in the closing direction of the valve needle (6) counter to the action of a restoring spring (21) which is supported on the nozzle body (2), and in that the valve needle (6) and/or the throttle ring (20) have/has at least one recess (23) which is open towards the throttle ring (20) or towards the valve needle (6) and forms the additional opening cross section.
  7. Fuel injection valve according to Claim 6, characterized in that the at least one recess (23) in the valve needle (6) is provided immediately downstream of the annular shoulder (13).
  8. Fuel injection valve according to Claim 6 or 7, characterized in that the restoring spring (21) is supported on an annular step (18) of the nozzle body (2) or on an adjustment disc (17) which is arranged between the restoring spring (21) and the annular step (18).
EP05804616A 2004-11-19 2005-10-28 Fuel-injection nozzle Not-in-force EP1815129B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055873A DE102004055873A1 (en) 2004-11-19 2004-11-19 fuel Injector
PCT/EP2005/055631 WO2006053821A1 (en) 2004-11-19 2005-10-28 Fuel-injection nozzle

Publications (2)

Publication Number Publication Date
EP1815129A1 EP1815129A1 (en) 2007-08-08
EP1815129B1 true EP1815129B1 (en) 2009-07-08

Family

ID=35634292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05804616A Not-in-force EP1815129B1 (en) 2004-11-19 2005-10-28 Fuel-injection nozzle

Country Status (4)

Country Link
EP (1) EP1815129B1 (en)
AT (1) ATE435970T1 (en)
DE (2) DE102004055873A1 (en)
WO (1) WO2006053821A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030868A1 (en) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Fuel injection valves in power engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT292383B (en) * 1967-08-09 1971-08-25 Bosch Gmbh Robert Fuel injection valve for pilot and main injection
JPS639672A (en) * 1986-06-30 1988-01-16 Diesel Kiki Co Ltd Pilot injection type fuel injection nozzle
DE19755057A1 (en) 1997-12-11 1999-06-17 Bosch Gmbh Robert Fuel injection nozzle for self-igniting internal combustion engines
CA2473639C (en) * 2004-07-09 2006-11-14 Westport Research Inc. Fuel injection valve

Also Published As

Publication number Publication date
ATE435970T1 (en) 2009-07-15
WO2006053821A1 (en) 2006-05-26
DE102004055873A1 (en) 2006-05-24
EP1815129A1 (en) 2007-08-08
DE502005007674D1 (en) 2009-08-20

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