WO2006053821A1 - Fuel-injection nozzle - Google Patents

Fuel-injection nozzle Download PDF

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Publication number
WO2006053821A1
WO2006053821A1 PCT/EP2005/055631 EP2005055631W WO2006053821A1 WO 2006053821 A1 WO2006053821 A1 WO 2006053821A1 EP 2005055631 W EP2005055631 W EP 2005055631W WO 2006053821 A1 WO2006053821 A1 WO 2006053821A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve needle
throttle ring
throttle
valve
ring
Prior art date
Application number
PCT/EP2005/055631
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
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
Priority to DE502005007674T priority Critical patent/DE502005007674D1/en
Priority to AT05804616T priority patent/ATE435970T1/en
Priority to EP05804616A priority patent/EP1815129B1/en
Publication of WO2006053821A1 publication Critical patent/WO2006053821A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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.
  • a fuel injector in such a, for example, DE 197 55 057 A1 known fuel injector in a bore of a nozzle body axially displaceable valve needle in the transition region of its conical sealing surface to its valve stem with a throttle device variable throttle cross-section through which, depending on the opening stroke of the valve needle, the injection quantity is variable.
  • 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. Already in series
  • Fuel injection nozzles without injection molding can be easily retrofitted by inserting the throttle ring.
  • 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.
  • Figs. 1a-1c show a first embodiment of the invention
  • FIGS. 2a-2c a second embodiment of the invention
  • a fuel injection nozzle 1 for self-igniting internal combustion engines.
  • 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.
  • an annular space 8 is formed around the valve needle 6, which is divided by a throttle ring 9 in an upstream subspace 8 a, which is connected to a high-pressure fuel line 10, and a downstream subspace 8 b, which extends 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 moves from its closed valve position shown in FIG. 1 a to the fully open valve position (opening stroke h max ) shown in FIG. 1 c , the valve needle 6 is up to the opening stroke h i (h i ⁇ h max ) at the sealing edge 14 at. Up to this opening stroke hi 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 hi, the amount of fuel injected via the now-released injection ports 5 is guided solely through the throttle bores 12.
  • the annular shoulder 13 lifts from the sealing edge 14 with the release of existing between the valve needle 6 and throttle ring 9 ring opening 15, which represents an additional opening cross section between the two subspaces 8a, 8b. Since the ring opening 15 has a smaller throttle resistance than all the throttle holes together 12, a larger amount of fuel is injected from the opening stroke hi, which is mainly performed by the annular opening 15. As shown in FIG. 3, from the opening stroke hi, the sealing edge 14 forms the foremost part of the throttle ring 9 in the opening direction of the valve needle 6.
  • FIG. 2 those elements which are identical to those in FIG. 1 are given the same reference numerals, so that with respect to their description, reference is made to the explanations concerning these exemplary embodiments.
  • the throttle ring 20 shown in Fig. 2 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 tightly with its sealing edge 14 on the annular shoulder 13 of the valve needle 6 and is of the annular shoulder 13 in the closing direction of the valve needle 6, i. down, taken against the action of the spring 21.
  • the downstream subspace 8b is connected to the upstream subspace 8a via the throttle openings 12, i. with the high-pressure fuel line 10, connected.
  • valve needle 6 moves from its closed valve position shown in FIG. 2 a to the fully open valve position (opening stroke h max ) shown in FIG. 2 c, the valve needle 6 is up to the opening stroke h i (h i ⁇ h max ) at the sealing edge 14 at. Up to this opening stroke hi the throttle ring 20 is displaced by the annular shoulder 13 of the valve needle 6 down and is sealingly against the valve needle 6 at. Therefore, until the opening stroke hi, the amount of fuel injected via the now-released injection ports 5 is guided solely through the throttle bores 12.

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 (h1) has been attained by the valve needle (6). Once said opening length of stroke (h1) 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

Kraftstoffeinspritzdüse fuel Injector
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, DE 197 55 057 A1 known fuel injector in a bore of a nozzle body axially displaceable valve needle in the transition region of its conical sealing surface to its valve stem with a throttle device variable throttle cross-section through which, depending on the opening stroke of the valve needle, the injection quantity is variable. 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 befindlicheThe 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
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.Fuel injection nozzles 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: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 ein erstes Ausführungsbeispiel der erfindungsgemäßenFigs. 1a-1c show a first embodiment of the invention
Kraftstoffeinspritzdüse bei unterschiedlichen Öffnungshüben der Ventilnadel; und Fign. 2a-2c ein zweites Ausführungsbeispiel der erfindungsgemäßenFuel injector at different opening strokes of the valve needle; and FIGS. 2a-2c, a second embodiment of the invention
Kraftstoffeinspritzdüse bei unterschiedlichen Öffnungshüben der Ventilnadel.Fuel injector 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 portion of a fuel injection nozzle 1 is shown for self-igniting internal combustion engines. 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 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 the bore 3, an annular space 8 is formed around the valve needle 6, which is divided by a throttle ring 9 in an upstream subspace 8 a, which is connected to a high-pressure fuel line 10, and a downstream subspace 8 b, which extends 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, 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 hi (hi < hmax) an der Dichtkante 14 an. Bis zu diesem Öffnungshub hi 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 hi die über die nun freigegebenen Einspritzöffnungen 5 eingespritzte Kraftstoffmenge allein durch die Drosselbohrungen 12 geführt.When the valve needle 6 moves from its closed valve position shown in FIG. 1 a to the fully open valve position (opening stroke h max ) shown in FIG. 1 c , the valve needle 6 is up to the opening stroke h i (h i <h max ) at the sealing edge 14 at. Up to this opening stroke hi 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 hi, the amount of fuel injected via the now-released injection ports 5 is guided solely through the throttle bores 12.
Ab einem Öffnungshub der Ventilnadel 6 größer als hi 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 hi eine größere Kraftstoffmenge eingespritzt, die hauptsächlich durch die Ringöffnung 15 geführt ist. Wie in Fig. 3 gezeigt, bildet ab dem Öffnungshub hi 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 hi, the annular shoulder 13 lifts from the sealing edge 14 with the release of existing between the valve needle 6 and throttle ring 9 ring opening 15, which represents an additional opening cross section between the two subspaces 8a, 8b. Since the ring opening 15 has a smaller throttle resistance than all the throttle holes together 12, a larger amount of fuel is injected from the opening stroke hi, which is mainly performed by the annular opening 15. As shown in FIG. 3, from the opening stroke hi, 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 hi 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. 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.Until the opening stroke hi only the throttle bores 12 act, then is opened with the annular opening 15, a larger flow area, so that in a structurally very simple way a Einspritzverlaufsformung is achieved at the fuel injector 1. By quickly closing the valve needle 6, this can be almost completely suppressed during the closing process. In FIG. 2, those elements which are identical to those in FIG. 1 are given the same reference numerals, so that with respect to their description, reference is made to the explanations concerning these exemplary embodiments. The throttle ring 20 shown in Fig. 2 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 tightly with its sealing edge 14 on the annular shoulder 13 of the valve needle 6 and is of the annular shoulder 13 in the closing direction of the valve needle 6, i. down, taken against the action of the spring 21. The downstream subspace 8b is connected to the upstream subspace 8a via the throttle openings 12, i. with the high-pressure fuel line 10, connected.
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 hi (hi < hmax) an der Dichtkante 14 an. Bis zu diesem Öffnungshub hi 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 hi die über die nun freigegebenen Einspritzöffnungen 5 eingespritzte Kraftstoffmenge allein durch die Drosselbohrungen 12 geführt.When the valve needle 6 moves from its closed valve position shown in FIG. 2 a to the fully open valve position (opening stroke h max ) shown in FIG. 2 c, the valve needle 6 is up to the opening stroke h i (h i <h max ) at the sealing edge 14 at. Up to this opening stroke hi the throttle ring 20 is displaced by the annular shoulder 13 of the valve needle 6 down and is sealingly against the valve needle 6 at. Therefore, until the opening stroke hi, the amount of fuel injected via the now-released injection ports 5 is guided solely through the throttle bores 12.
Ab einem Öffnungshub der Ventilnadel 6 größer als hi 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 hi eine größere Kraftstoffmenge eingespritzt, die hauptsächlich durch die Ausnehmungen 23 geführt ist. From an opening stroke of the valve needle 6 is greater than hi, the annular shoulder 13 lifts from the sealing edge 14 with the release of the recesses 23, which provide an additional Opening cross section between the two subspaces 8a, 8b represent. Since the recesses 23 have a smaller throttle resistance than all the throttle holes 12 together, a larger amount of fuel is injected from the opening stroke hi, which is mainly guided by the recesses 23.

Claims

Patentansprüche claims
1. Kraftstoffeinspritzdüse (1 ) für Brennkraftmaschinen, mit einer in einer Bohrung (3) eines Düsenkörpers (2) axial verschiebbaren Ventilnadel (6), die an ihrem brennraumseitigen Ende eine Ventildichtfläche (7) aufweist, mit der sie mit einer Ventilsitzfläche (4) des Düsenkörpers (2) zusammenwirkt, mit mindestens einer stromabwärts der Ventilsitzfläche (4) vorgesehenen Einspritzöffnung (5), die sich in den Brennraum der zu versorgenden Brennkraftmaschine öffnet, sowie mit einem in der Bohrung (3) um die Ventilnadel (6) herum gebildeten Ringraum (8), der durch einen mindestens eine Drosselöffnung (12) aufweisenden Drosselring (9; 20) 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, wobei zumindest ein Teil des Drosselrings (9; 20) durch eine Axialbewegung der Ventilnadel (6) gegen die Wirkung einer Rückstell kraft axial mitgenommen wird, dadurch gekennzeichnet, dass der Drosselring (9; 20) dauerhaft an der Bohrungswand (1 1 ) dicht anliegt und eine mit der Ventilnadel (6) zusammenwirkende, axial auslenkbare Dichtkante (14) aufweist und dass die Ventilnadel (6) im1. Fuel injection nozzle (1) for internal combustion engines, with a in a bore (3) of a nozzle body (2) axially displaceable valve needle (6) having at its combustion chamber end a valve sealing surface (7), with which it with a valve seat surface (4) the nozzle body (2) cooperates with at least one injection opening (5) provided downstream of the valve seat surface (4) which opens into the combustion chamber of the internal combustion engine to be supplied and with one formed in the bore (3) around the valve needle (6) Annular space (8) passing through an at least one throttle opening (12) having throttle ring (9; 20) in an upstream subspace (8a) which is connected to a high-pressure fuel line (10), and a downstream subspace (8b), which extends to extends to the valve seat surface (4), wherein at least a part of the throttle ring (9; 20) by an axial movement of the valve needle (6) against the action of a return Stell force is taken axially, characterized in that the throttle ring (9; 20) permanently against the bore wall (1 1) and bears tightly with the valve needle (6) cooperating, axially deflectable sealing edge (14) and that the valve needle (6) in
Ringraum (8) eine den Drosselring (9; 20) in Schließrichtung der Ventilnadel (6) hintergreifende Ringschulter (13) aufweist, an der die Dichtkante (14) bis zu einem bestimmten Öffnungshub (h-i) der Ventilnadel (6) dicht anliegt und die ab dem bestimmten Öffnungshub (h-i) von der Dichtkante (14) unter Ausbildung eines beide Teilräume (8a, 8b) miteinander verbindenden zusätzlichen Öffnungsquerschnitts abgehoben ist.Annular space (8) has an annular shoulder (13) engaging behind the throttle ring (9; 20) in the closing direction of the valve needle (6), against which the sealing edge (14) rests tightly up to a certain opening stroke (hi) of the valve needle (6); is raised from the sealing edge (14) from the specific opening stroke (hi) to form an additional opening cross-section connecting the two subspaces (8a, 8b).
2. Kraftstoffeinspritzventil nach Anspruch 1 , dadurch gekennzeichnet, dass der Drosselring (9) an der Bohrungswand (1 1 ) axial unverschiebbar anliegt. 2. Fuel injection valve according to claim 1, characterized in that the throttle ring (9) bears against the bore wall (1 1) axially immovable.
3. Kraftstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass die Dichtkante (14) des Drosselrings (9) gegenüber seinem an der Bohrungswand (11 ) anliegenden äußeren Ringabschnitt elastisch verformbar ist.3. Fuel injection valve according to claim 2, characterized in that the sealing edge (14) of the throttle ring (9) relative to its on the bore wall (11) adjacent the outer ring portion is elastically deformable.
4. Kraftstoffeinspritzventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass ab dem bestimmten Öffnungshub (h-i) die Dichtkante (14) den in Öffnungsrichtung der Ventilnadel (6) vordersten Teil des Drosselrings (9) bildet.4. Fuel injection valve according to claim 2 or 3, characterized in that from the specific opening stroke (h-i), the sealing edge (14) in the opening direction of the valve needle (6) foremost part of the throttle ring (9).
5. Kraftstoffeinspritzventil nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Drosselring (9) auf einem Ringabsatz (18) des Düsenkörpers (2) oder auf einer zwischen Drosselring (9) und Ringabsatz (18) angeordneten Einstellscheibe (17) aufliegt.5. Fuel injection valve according to one of claims 2 to 4, characterized in that the throttle ring (9) on an annular shoulder (18) of the nozzle body (2) or on a between throttle ring (9) and annular shoulder (18) arranged adjusting disc (17) rests ,
6. Kraftstoffeinspritzventil nach Anspruch 1 , dadurch gekennzeichnet, dass der Drosselring (20) im Ringraum (8) in Schließrichtung der Ventilnadel (6) gegen die Wirkung einer am Düsenkörper (2) abgestützten Rückstellfeder (21 ) axial verschiebbar geführt ist und dass die Ventilnadel (6) und/oder der6. Fuel injection valve according to claim 1, characterized in that the throttle ring (20) in the annular space (8) in the closing direction of the valve needle (6) against the action of a nozzle body (2) supported return spring (21) is guided axially displaceable and that the valve needle (6) and / or the
Drosselring (20) mindestens eine zum Drosselring (20) bzw. zur Ventilnadel (6) hin offene Ausnehmung (23) aufweist, die den zusätzlichen Öffnungsquerschnitt bildet.Has throttle ring (20) at least one to the throttle ring (20) and the valve needle (6) open towards recess (23) which forms the additional opening cross-section.
7. Kraftstoffeinspritzventil nach Anspruch 6, dadurch gekennzeichnet, dass die mindestens eine Ausnehmung (23) in der Ventilnadel (6) unmittelbar stromabwärts der Ringschulter (13) vorgesehen ist.7. Fuel injection valve according to claim 6, characterized in that the at least one recess (23) in the valve needle (6) immediately downstream of the annular shoulder (13) is provided.
8. Kraftstoffeinspritzventil nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Rückstellfeder (21 ) auf einem Ringabsatz (18) des Düsenkörpers8. Fuel injection valve according to claim 6 or 7, characterized in that the return spring (21) on an annular shoulder (18) of the nozzle body
(2) oder auf einer zwischen Rückstellfeder (21 ) und Ringabsatz (18) angeordneten Einstellscheibe (17) abgestützt ist. (2) or on a between the return spring (21) and annular shoulder (18) arranged shim (17) is supported.
PCT/EP2005/055631 2004-11-19 2005-10-28 Fuel-injection nozzle WO2006053821A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE502005007674T DE502005007674D1 (en) 2004-11-19 2005-10-28 fuel Injector
AT05804616T ATE435970T1 (en) 2004-11-19 2005-10-28 FUEL INJECTOR
EP05804616A EP1815129B1 (en) 2004-11-19 2005-10-28 Fuel-injection nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055873.6 2004-11-19
DE102004055873A DE102004055873A1 (en) 2004-11-19 2004-11-19 fuel Injector

Publications (1)

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WO2006053821A1 true WO2006053821A1 (en) 2006-05-26

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ID=35634292

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PCT/EP2005/055631 WO2006053821A1 (en) 2004-11-19 2005-10-28 Fuel-injection nozzle

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003458A1 (en) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Fuel injection valves in combustion engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1578298A (en) * 1967-08-09 1969-08-14
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
CA2473639A1 (en) * 2004-07-09 2004-11-12 Westport Research Inc. Fuel injection valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1578298A (en) * 1967-08-09 1969-08-14
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
CA2473639A1 (en) * 2004-07-09 2004-11-12 Westport Research Inc. Fuel injection valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 206 (M - 708) 14 June 1988 (1988-06-14) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003458A1 (en) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Fuel injection valves in combustion engines

Also Published As

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EP1815129B1 (en) 2009-07-08
DE502005007674D1 (en) 2009-08-20
DE102004055873A1 (en) 2006-05-24
ATE435970T1 (en) 2009-07-15
EP1815129A1 (en) 2007-08-08

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