EP1379778B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1379778B1
EP1379778B1 EP02737742A EP02737742A EP1379778B1 EP 1379778 B1 EP1379778 B1 EP 1379778B1 EP 02737742 A EP02737742 A EP 02737742A EP 02737742 A EP02737742 A EP 02737742A EP 1379778 B1 EP1379778 B1 EP 1379778B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
fuel
valve according
spray hole
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
EP02737742A
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German (de)
French (fr)
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EP1379778A1 (en
Inventor
Guenter Dantes
Detlef Nowak
Matthias Waldau
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1379778A1 publication Critical patent/EP1379778A1/en
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    • 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
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M61/1853—Orifice plates

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection system for an internal combustion engine having an injector with a fuel jet adjusting plate having first nozzle holes arranged along a first circle and second nozzle holes arranged along a second circle.
  • the second circle has a diameter larger than that of the first circle.
  • the circles are arranged coaxially with a central axis of the adjustment plate.
  • Each hole axis of the second nozzle holes forms an acute angle with a reference plane which is perpendicular to the central axis of the valve body. The angle is smaller than the one through each.
  • Hole axis of the first nozzle holes is formed with the reference plane.
  • fuel sprays injected through the first nozzle holes may be directed away from the fuel atomizations injected through the second nozzle holes.
  • the fuel atomizations injected through the first nozzle holes do not disturb the fuel atomizations that occur be injected through the second nozzle holes, which makes it possible to properly atomize the injected fuel.
  • the nebulizer consists of a domed disc, which is crossed by equilateral triangular Abspritzlöchern, which increase in the direction of the downstream end. It is believed that the triangular Abspritzlöcher a more uniform drop shape of the fuel mist is formed.
  • the nebulizer itself is mounted between the valve body and the valve seat body with a seal between the underside of the nebulizer and the valve seat body. Between the underside of the atomizer, the valve seat body and the gap between the atomizer and the valve seat body, a dead volume is formed. Even during the dead time of the valve fuel can enter from the dead volume in the combustion chamber.
  • a disadvantage of the method for mixture formation or fuel injection valve known from the above publication is, in particular, the lack of homogeneity of the mixture cloud and the problem of transporting the ignitable mixture into the region of the spark gap of the spark plug.
  • the lack of homogeneity of the mixture cloud and the problem of transporting the ignitable mixture into the region of the spark gap of the spark plug.
  • swirl valves or swirling mechanisms must be used in these cases, on the one hand to fill the combustion chamber with the fuel / air mixture and on the other hand to lead the ignitable mixture to the spark plug.
  • the spark plug is usually sprayed directly. This leads to heavy sooting of the spark plug and frequent thermal shock, whereby the spark plug has a shorter life.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that a dome-shaped curved spray orifice plate is mounted at the downstream end of the valve seat body of the fuel injection valve, that the coking can be optimized by reducing the dead volume.
  • the spray hole plate can be produced in a simple manner and into a recess of the fuel injection valve downstream of the sealing seat be inserted.
  • the attachment can be done for example by means of a weld.
  • the thermal shock load and the fouling of the spark plug are reduced by an optimal hole design of Abspritzlöcher.
  • Sharp-edged spray holes and the conical shape of the same prevent a detachment of the fuel flow in the spray hole, whereby the coking decreases sharply.
  • the conical Abspritzlöcher have the advantage that the pressure drop of the fuel at the outlet opening is minimal and thus maximum pressure energy for spray formation is available.
  • the injection jets in the combustion chamber can advantageously be considered the mounting position of the intake and exhaust valves and the spark plug in the cylinder head and still the combustion chamber geometry can be optimally used.
  • Fig. 1 shows in an extractive sectional view an example of a fuel injection valve 1.
  • the fuel injection valve 1 is embodied in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has a bore 7 for the forwarding of the fuel downstream of the sealing seat.
  • the valve closing body 4 of the inventively designed fuel injection valve 1 has a nearly spherical shape. As a result, an offset-free, gimbal valve needle guide is achieved, which ensures an exact functioning of the fuel injection valve 1.
  • valve seat body 5 of the fuel injection valve 1 is formed almost pot-shaped and carries by its shape for valve needle guide both valve seat body 5 is inserted into a discharge-side recess 34 of the nozzle body 2 and connected by a weld 35 with the nozzle body 2. Between the nozzle body 2 and the valve seat body 5, a dome-shaped curved spray perforated disk 36 is arranged, which is fixed by means of the weld seam 35 between the nozzle body 2 and the valve seat body 5.
  • the spray perforated disk 36 closes the fuel injection valve 1 downstream and covers the bore 7.
  • the fuel flowing through the fuel injection valve 1 is injected into the combustion chamber of the internal combustion engine (not shown) via a plurality of injection holes 37 arranged in the spray-orifice disk 36.
  • a more detailed description of the spray perforated disk 36 is the description of the FIGS. 2 to 4 refer to.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 'of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15, there is an armature 20. This is connected via a first flange 21 frictionally with the valve needle 3 in conjunction, which is connected by a weld 22 with the first flange 21.
  • a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • a second flange 31 is arranged, which serves as a lower anchor stop. He is connected via a weld 33 non-positively with the valve needle 3. Between the armature 20 and the second flange 31, an elastic intermediate ring 32 for damping armature bouncers when closing the fuel injection valve 1 is arranged.
  • the armature 20 and the valve seat body 5 run fuel channels 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25 to the bore 7.
  • the fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.
  • the first flange 21 is acted on the valve needle 3 by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement.
  • the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
  • this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus the valve needle 3 also in the stroke direction with.
  • the valve closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface 6, whereby the fuel guided via the fuel channels 30a to 30c to the bore 7 is hosed down.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the first flange 21 from the inner pole 13, whereby the valve needle 3 moves against the stroke direction.
  • the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed.
  • the armature 20 is seated on the anchor stop formed by the second flange 31.
  • Fig. 2 shows in an excerpted sectional view the in Fig. 1 with II designated section of the in Fig. 1 illustrated, the first embodiment of an inventively designed fuel injector. 1
  • a spray orifice plate 36 is arranged, which covers the fuel injection valve 1 to the combustion chamber.
  • the spray perforated disk 36 is fixed to the valve seat body 5 by a weld 35, which connects the valve seat body 5 to the nozzle body 2.
  • the bore 7 is also covered.
  • the injection of the fuel into the combustion chamber of the internal combustion engine take over spray holes 37 which are formed in the spray-disk 36 and offset from the bore 7 arranged centrally in the valve-seat body 5.
  • a deflection of the fuel flow is achieved, which causes the Abspritzlöcher 37 may be less inclined and thereby facilitates their production and increases the precision in the production.
  • the spray perforated disk 36 is curved in the form of a dome in the present exemplary embodiment and adapted to the valve seat body 5.
  • the advantage of the dished shape of the spray perforated disk 36 is on the one hand in the ease of manufacture, on the other hand, in the flexibility with respect to the fuel injection valves 1, which can be equipped with the kalottwholesome spray orifice plate 36.
  • valve closure member 4 which has a plurality of gates 38 in the present embodiment, and the bore 7, it passes into a volume 39 which is formed between an end face 40 of the valve seat body 5 and the spray hole disc 36.
  • the fuel is injected into the combustion chamber of the internal combustion engine with a change of direction through the spray holes 37 formed in the spray-orifice disk 36.
  • the Ab mousselöcher 37 are conically shaped and have in particular sharp exit edges 41 and a funnel-shaped inflow region 42.
  • This hole shape has the particular advantage that the fuel flow within the Abspritzlöcher 37 does not break, so that the outlet openings of the combustion chamber towards the tapered Abspritzlöcher 37 are completely filled over its cross-section with fuel. In this way, coking can be prevented since no recirculation of the fuel in the discharge hole 37 occurs.
  • the spray perforated disk 36 is flexibly applicable for any desired jet opening angle and angle of inclination of the sealing seat as well as for any static flow values through the fuel injection valve 1.
  • Fig. 3 shows in an excerpted sectional view in the same view as Fig. 2 A second embodiment of a fuel injection valve according to the invention 1. The same components are provided with matching reference numerals.
  • the remaining components of the fuel injection valve 1 may be identical to those in FIG Fig. 1 and 2 be formed fuel injector 1 shown.
  • the reduction of the volume 39 allows a homogenization of the fuel flow, which does not come to a halt in the dead times of the fuel injection valve 1. The coking is thereby also reduced.
  • the flow deflection is enhanced by the reduction in the volume 39, whereby the inclination of the Abspritzlöcher 37 can be further reduced and the precision of the production of the Abspritzlöcher 37 can be increased.
  • Fig. 4 shows a detail of a highly schematic representation of a section of the spray perforated disk 36 of an inventively designed fuel injection valve 1 in the area IV in Fig. III.
  • Fig. 4 the conical course of the Abspritzlöcher 37 with the funnel-shaped inlet region 42 and the sharp edges 41 clearly visible.
  • the narrowest cross section of the Abspritzlöcher 37 is formed downstream and ensures a suppression of the recirculation in the Abspritzloch 37, since the fuel flow is not torn off and thereby the outlet cross-section is continuously filled with fuel.
  • the preparation of the Abspritzlöcher 37 in the spray perforated disk 36 can be done by means of single-layer microplating, punching, etching, or laser drilling, the spray orifice plate 36 is still flat. After the preparation of the Abspritzlöcher 37, the spray perforated disk 36 is diced, for example by means of embossing.
  • the invention is not limited to the illustrated embodiments and z. B. also for Inwardly opening fuel injectors 1 of any design applicable.

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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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.

Aus der DE 198 27 219 A1 ist ein Brennstoffeinspritzsystem für eine Brennkraftmaschine bekannt, welche einen Injektor mit einer Brennstoffstrahleinstellplatte aufweist, welche erste Düsenlöcher besitzt, die entlang eines ersten Kreises angeordnet sind, sowie zweite Düsenlöcher, die entlang eines zweiten Kreises.angeordnet sind. Der zweite Kreis hat einen Durchmesser, der größer als derjenige des ersten Kreises ist. Die Kreise sind dabei .koaxial zu einer Mittelachse der Einstellplatte angeordnet. Jede Lochachse der zweiten Düsenlöcher bildet einen spitzen Winkel mit einer Referenzebene, die senkrecht zur Mittelachse des Ventilkörpers ist. Der Winkel ist kleiner als derjenige, der durch jede. Lochachse der ersten Düsenlöcher mit der Referenzebene gebildet wird. Daher können Brennstoffzerstäubungen, die durch die ersten Düsenlöcher eingespritzt werden, weg von den Brennstoffzerstäubungen gerichtet werden, die durch die zweiten Düsenlöcher eingespritzt werden. Als ein Ergebnis stören die Brennstoffzerstäubungen, die durch die ersten Düsenlöcher eingespritzt werden, nicht die Brennstoffzerstäubungen, die durch die zweiten Düsenlöcher eingespritzt werden, was es ermöglicht, eingespritzten Brennstoff geeignet zu zerstäuben.From the DE 198 27 219 A1 For example, there is known a fuel injection system for an internal combustion engine having an injector with a fuel jet adjusting plate having first nozzle holes arranged along a first circle and second nozzle holes arranged along a second circle. The second circle has a diameter larger than that of the first circle. The circles are arranged coaxially with a central axis of the adjustment plate. Each hole axis of the second nozzle holes forms an acute angle with a reference plane which is perpendicular to the central axis of the valve body. The angle is smaller than the one through each. Hole axis of the first nozzle holes is formed with the reference plane. Therefore, fuel sprays injected through the first nozzle holes may be directed away from the fuel atomizations injected through the second nozzle holes. As a result, the fuel atomizations injected through the first nozzle holes do not disturb the fuel atomizations that occur be injected through the second nozzle holes, which makes it possible to properly atomize the injected fuel.

Weiterhin sind aus der Druckschrift US-A-4, 080, 700 ein Verfahren zur Zerstäubung einer Flüssigkeit mittels eines Zerstäubers und die Herstellung des Zerstäubers bekannt. Der Zerstäuber besteht aus einer gewölbten Scheibe, die von gleichseitigen dreieckförmigen Abspritzlöchern durchzogen ist, die sich in Richtung des abströmseitigen Endes hin vergrößern. Es wird vermutet, dass durch die dreieckförmigen Abspritzlöcher eine einheitlichere Tropfenform des Brennstoffnebels entsteht. Der Zerstäuber selbst wird zwischen dem Ventilkörper und dem Ventilsitzkörper montiert, wobei eine Dichtung zwischen der Unterseite des Zerstäubers und dem Ventilsitzkörper angebracht ist. Zwischen der Unterseite des Zerstäubers, dem Ventilsitzkörper und dem Spalt zwischen Zerstäuber und Ventilsitzkörper wird ein Totvolumen ausbildet. Auch während der Totzeit des Ventils kann Brennstoff aus dem Totvolumen in den Brennraum eintreten.Furthermore, from the document US-A-4,080,700 a method for atomizing a liquid by means of an atomizer and the production of the atomizer known. The nebulizer consists of a domed disc, which is crossed by equilateral triangular Abspritzlöchern, which increase in the direction of the downstream end. It is believed that the triangular Abspritzlöcher a more uniform drop shape of the fuel mist is formed. The nebulizer itself is mounted between the valve body and the valve seat body with a seal between the underside of the nebulizer and the valve seat body. Between the underside of the atomizer, the valve seat body and the gap between the atomizer and the valve seat body, a dead volume is formed. Even during the dead time of the valve fuel can enter from the dead volume in the combustion chamber.

Nachteilig an dem aus der obengenannten Druckschrift bekannten Verfahren zur Gemischbildung bzw. Brennstoffeinspritzventil ist insbesondere die mangelnde Homogenität der Gemischwolke sowie das Problem, das zündfähige Gemisch in den Bereich der Funkenstrecke der Zündkerze zu transportieren. Um eine emissionsarme, brennstoffsparende Verbrennung zu ermöglichen, müssen in diesen Fällen komplizierte Brennraumgeometrien, Drallventile oder Verwirbelungsmechanismen benutzt werden, um einerseits den Brennraum mit dem Brennstoff-/Luftgemisch zu füllen und andererseits das zündfähige Gemisch zur Zündkerze zu führen.A disadvantage of the method for mixture formation or fuel injection valve known from the above publication is, in particular, the lack of homogeneity of the mixture cloud and the problem of transporting the ignitable mixture into the region of the spark gap of the spark plug. In order to enable a low-emission, fuel-efficient combustion, complicated combustion chamber geometries, swirl valves or swirling mechanisms must be used in these cases, on the one hand to fill the combustion chamber with the fuel / air mixture and on the other hand to lead the ignitable mixture to the spark plug.

Dabei wird zumeist die Zündkerze direkt angespritzt. Dies führt zu starker Verrußung der Zündkerze und häufigen Thermoschocks, wodurch die Zündkerze eine kürzere Lebensdauer aufweist.The spark plug is usually sprayed directly. This leads to heavy sooting of the spark plug and frequent thermal shock, whereby the spark plug has a shorter life.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß eine kalottenförmige gewölbte Spritzlochscheibe so am abströmseitigen Ende des Ventilsitzkörpers des Brennstoffeinspritzventils angebracht ist, daß die Verkokung durch eine Verkleinerung des Totvolumens optimiert werden kann.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that a dome-shaped curved spray orifice plate is mounted at the downstream end of the valve seat body of the fuel injection valve, that the coking can be optimized by reducing the dead volume.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements of the fuel injection valve specified in the main claim are possible.

Vorteilhafterweise kann die Spritzlöchscheibe in einfacher Weise hergestellt und in eine Ausnehmung des Brennstoffeinspritzventils abströmseitig des Dichtsitzes eingelegt werden. Die Befestigung kann beispielsweise mittels einer Schweißnaht erfolgen.Advantageously, the spray hole plate can be produced in a simple manner and into a recess of the fuel injection valve downstream of the sealing seat be inserted. The attachment can be done for example by means of a weld.

Insbesondere werden die Thermoschockbelastung und die Verrußung der Zündkerze durch eine optimale Lochgestaltung der Abspritzlöcher vermindert. Scharfkantige Abspritzlöcher und die konische Gestaltung derselben verhindern ein Ablösen der Brennstoffströmung im Abspritzloch, wodurch die Verkokung stark zurückgeht.In particular, the thermal shock load and the fouling of the spark plug are reduced by an optimal hole design of Abspritzlöcher. Sharp-edged spray holes and the conical shape of the same prevent a detachment of the fuel flow in the spray hole, whereby the coking decreases sharply.

Die konischen Abspritzlöcher haben den Vorteil, daß der Druckabfall des Brennstoffs an der Austrittsöffnung minimal ist und somit maximale Druckenergie zur Spraybildung zur Verfügung steht.The conical Abspritzlöcher have the advantage that the pressure drop of the fuel at the outlet opening is minimal and thus maximum pressure energy for spray formation is available.

Durch eine gezielte Anordnung der Abspritzlöcher und damit der Einspritzstrahlen im Brennraum kann vorteilhafterweise auch die Einbaulage der Ein- und Auslaßventile sowie der Zündkerze im Zylinderkopf berücksichtigt werden und trotzdem die Brennraumgeometrie optimal genutzt werden.By a targeted arrangement of Abspritzlöcher and thus the injection jets in the combustion chamber can advantageously be considered the mounting position of the intake and exhaust valves and the spark plug in the cylinder head and still the combustion chamber geometry can be optimally used.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein Beispiel eines Brennstoffeinspritzventils,
Fig. 2
einen schematischen Schnitt durch den abspritzseitigen Teil des in Fig. 1 dargestellten Beispiels des Brennstoffeinspritzventils im Bereich II in Fig. 1,
Fig. 3
einen schematischen Schnitt durch ein Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems im gleichen Bereich wie Fig. 2, und
Fig. 4
einen schematischen Schnitt durch die Spritzlochscheibe des in Fig. 3 dargestellten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils im Bereich IV in Fig. 3.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an example of a fuel injection valve,
Fig. 2
a schematic section through the discharge-side part of in Fig. 1 illustrated example of the fuel injection valve in the area II in Fig. 1 .
Fig. 3
a schematic section through an embodiment of the invention Fuel injection system in the same area as Fig. 2 , and
Fig. 4
a schematic section through the spray perforated disk of in Fig. 3 illustrated embodiment of a fuel injection valve according to the invention in the area IV in Fig. 3 ,

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt in einer auszugsweisen Schnittdarstellung ein Beispiel eines Brennstoffeinspritzventils 1. Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine. Fig. 1 shows in an extractive sectional view an example of a fuel injection valve 1. The fuel injection valve 1 is embodied in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines. The fuel injection valve 1 is suitable for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht in Wirkverbindung mit einem Ventilschließkörper 4, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über eine Bohrung 7 zur Weiterleitung des Brennstoffs abströmseitig des Dichtsitzes verfügt.The fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged. The valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has a bore 7 for the forwarding of the fuel downstream of the sealing seat.

Der Ventilschließkörper 4 des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 weist eine nahezu kugelförmige Form auf. Dadurch wird eine versatzfreie, kardanische Ventilnadelführung erzielt, die für eine exakte Funktionsweise des Brennstoffeinspritzventils 1 sorgt.The valve closing body 4 of the inventively designed fuel injection valve 1 has a nearly spherical shape. As a result, an offset-free, gimbal valve needle guide is achieved, which ensures an exact functioning of the fuel injection valve 1.

Der Ventilsitzkörper 5 des Brennstoffeinspritzventils 1 ist nahezu topfförmig ausgebildet und trägt durch seine Form zur Ventilnadelführung beider Ventilsitzkörper 5 ist dabei in eine abspritzseitige Ausnehmung 34 des Düsenkörpers 2 eingesetzt und mittels einer Schweißnaht 35 mit dem Düsenkörper 2 verbunden. Zwischen dem Düsenkörper 2 und dem Ventilsitzkörper 5 ist eine kalottenförmig gewölbte Spritzlochscheibe 36 angeordnet, die mittels der Schweißnaht 35 zwischen dem Düsenkörper 2 und dem Ventilsitzkörper 5 fixiert ist.The valve seat body 5 of the fuel injection valve 1 is formed almost pot-shaped and carries by its shape for valve needle guide both valve seat body 5 is inserted into a discharge-side recess 34 of the nozzle body 2 and connected by a weld 35 with the nozzle body 2. Between the nozzle body 2 and the valve seat body 5, a dome-shaped curved spray perforated disk 36 is arranged, which is fixed by means of the weld seam 35 between the nozzle body 2 and the valve seat body 5.

Die Spritzlochscheibe 36 schließt das Brennstoffeinspritzventil 1 abströmseitig ab und deckt dabei die Bohrung 7 ab. Der das Brennstoffeinspritzventil 1 durchströmende Brennstoff wird über mehrere in der Spritzlochscheibe 36 angeordnete Abspritzlöcher 37 in den nicht weiter dargestellten Brennraum der Brennkraftmaschine eingespritzt. Eine detailliertere Beschreibung der Spritzlochscheibe 36 ist der Beschreibung zu den Figuren 2 bis 4 zu entnehmen.The spray perforated disk 36 closes the fuel injection valve 1 downstream and covers the bore 7. The fuel flowing through the fuel injection valve 1 is injected into the combustion chamber of the internal combustion engine (not shown) via a plurality of injection holes 37 arranged in the spray-orifice disk 36. A more detailed description of the spray perforated disk 36 is the description of the FIGS. 2 to 4 refer to.

Der Düsenkörper 2 ist durch eine Dichtung 8 gegen einen Außenpol 9' einer Magnetspule 10 abgedichtet. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch einen Spalt 26 voneinander getrennt und stützen sich auf einem Verbindungsbauteil 29 ab. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The nozzle body 2 is sealed by a seal 8 against an outer pole 9 'of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.

Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. An der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen -ersten Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem ersten Flansch 21 verbunden ist. Auf dem ersten Flansch 21, stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird.The valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped. On the other side of the dial 15, there is an armature 20. This is connected via a first flange 21 frictionally with the valve needle 3 in conjunction, which is connected by a weld 22 with the first flange 21. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.

Abströmseitig des Ankers 20 ist ein zweiter Flansch 31 angeordnet, der als unterer Ankeranschlag dient. Er ist über eine Schweißnaht 33 kraftschlüssig mit der Ventilnadel 3 verbunden. Zwischen dem Anker 20 und dem zweiten Flansch 31 ist ein elastischer Zwischenring 32 zur Dämpfung von Ankerprellern beim Schließen des Brennstoffeinspritzventils 1 angeordnet.Downstream of the armature 20, a second flange 31 is arranged, which serves as a lower anchor stop. He is connected via a weld 33 non-positively with the valve needle 3. Between the armature 20 and the second flange 31, an elastic intermediate ring 32 for damping armature bouncers when closing the fuel injection valve 1 is arranged.

In der Ventilnadelführung 14, im Anker 20 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a bis 30c, die den Brennstoff, welcher über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert wird, zur Bohrung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Verteilerleitung abgedichtet.In the valve needle guide 14, the armature 20 and the valve seat body 5 run fuel channels 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25 to the bore 7. The fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der erste Flansch 21 an der Ventilnadel 3 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Der Anker 20 liegt auf dem Zwischenring 32 auf, der sich auf dem zweiten Flansch 31 abstützt. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt. Dabei nimmt der Anker 20 den ersten Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, und damit die Ventilnadel 3 ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, wodurch der über die Brennstoffkanäle 30a bis 30c zur Bohrung 7 geführte Brennstoff abgespritzt wird.In the idle state of the fuel injection valve 1, the first flange 21 is acted on the valve needle 3 by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. The armature 20 rests on the intermediate ring 32, which is supported on the second flange 31. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction. In this case, the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus the valve needle 3 also in the stroke direction with. The valve closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface 6, whereby the fuel guided via the fuel channels 30a to 30c to the bore 7 is hosed down.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 auf den ersten Flansch 21 vom Innenpol 13 ab, wodurch sich die Ventilnadel 3 entgegen der Hubrichtung bewegt. Dadurch setzt der Ventilschließkörper 4 auf der Ventilsitzfläche 6 auf, und das Brennstoffeinspritzventil 1 wird geschlossen. Der Anker 20 setzt auf dem durch den zweiten Flansch 31 gebildeten Ankeranschlag auf.If the coil current is turned off, the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the first flange 21 from the inner pole 13, whereby the valve needle 3 moves against the stroke direction. As a result, the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed. The armature 20 is seated on the anchor stop formed by the second flange 31.

Fig. 2 zeigt in einer auszugsweisen Schnittdarstellung den in Fig. 1 mit II bezeichneten Ausschnitt aus dem in Fig. 1 dargestellten, ersten Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Fig. 2 shows in an excerpted sectional view the in Fig. 1 with II designated section of the in Fig. 1 illustrated, the first embodiment of an inventively designed fuel injector. 1

Wie bereits in der Beschreibung zu Fig. 1 erwähnt, ist an einem abströmseitigen Ende des Brennstoffeinspritzventils 1 eine Spritzlochscheibe 36 angeordnet, die das Brennstoffeinspritzventil 1 zum Brennraum hin abdeckt. Die Spritzlochscheibe 36 ist durch eine Schweißnaht 35, welche den Ventilsitzkörper 5 mit dem Düsenkörper 2 verbindet, am Ventilsitzkörper 5 fixiert. Durch die Spritzlochscheibe 36 wird ebenfalls die Bohrung 7 abgedeckt. Die Einspritzung des Brennstoffs in den Brennraum der Brennkraftmaschine übernehmen Abspritzlöcher 37, die in der Spritzlochscheibe 36 ausgebildet und gegenüber der zentral im Ventilsitzkörper 5 angeordneten Bohrung 7 versetzt sind. Dadurch wird eine Umlenkung der Brennstoffströmung erzielt, die bewirkt, daß die Abspritzlöcher 37 weniger stark geneigt sein können und sich dadurch ihre Herstellung erleichtert sowie die Präzision bei der Herstellung erhöht.As already in the description too Fig. 1 mentioned, at a downstream end of the fuel injection valve 1, a spray orifice plate 36 is arranged, which covers the fuel injection valve 1 to the combustion chamber. The spray perforated disk 36 is fixed to the valve seat body 5 by a weld 35, which connects the valve seat body 5 to the nozzle body 2. Through the spray disk 36, the bore 7 is also covered. The injection of the fuel into the combustion chamber of the internal combustion engine take over spray holes 37 which are formed in the spray-disk 36 and offset from the bore 7 arranged centrally in the valve-seat body 5. As a result, a deflection of the fuel flow is achieved, which causes the Abspritzlöcher 37 may be less inclined and thereby facilitates their production and increases the precision in the production.

Die Spritzlochscheibe 36 ist im vorliegenden Ausführungsbeispiel kalottiert gewölbt ausgebildet und an den Ventilsitzkörper 5 angepaßt. Der Vorteil der kalottierten Form der Spritzlochscheibe 36 liegt zum einen in der einfachen Herstellbarkeit, zum anderen, in der Flexibilität gegenüber den Brennstoffeinspritzventilen 1, die mit der kalottierten Spritzlochscheibe 36 ausgestattet werden können.The spray perforated disk 36 is curved in the form of a dome in the present exemplary embodiment and adapted to the valve seat body 5. The advantage of the dished shape of the spray perforated disk 36 is on the one hand in the ease of manufacture, on the other hand, in the flexibility with respect to the fuel injection valves 1, which can be equipped with the kalottierten spray orifice plate 36.

Wenn der Brennstoff den Ventilschließkörper 4, der im vorliegenden Ausführungsbeispiel mehrere Anschnitte 38 aufweist, und die Bohrung 7 passiert hat, gelangt er in ein Volumen 39, das zwischen einer Stirnseite 40 des Ventilsitzkörpers 5 und der Spritzlochscheibe 36 ausgebildet ist. Durch den Brennstoffdruck wird der Brennstoff unter einem Richtungswechsel durch die in der Spritzlochscheibe 36 ausgebildeten Abspritzlöcher 37 in den Brennraum der Brennkraftmaschine eingespritzt.When the fuel has passed through the valve closure member 4, which has a plurality of gates 38 in the present embodiment, and the bore 7, it passes into a volume 39 which is formed between an end face 40 of the valve seat body 5 and the spray hole disc 36. As a result of the fuel pressure, the fuel is injected into the combustion chamber of the internal combustion engine with a change of direction through the spray holes 37 formed in the spray-orifice disk 36.

Die Abspritzlöcher 37 sind dabei konisch geformt und weisen insbesondere scharfe Austrittskanten 41 sowie einen trichterförmigen Zuströmbereich 42 auf. Diese Lochform bietet insbesondere den Vorteil, daß die Brennstoffströmung innerhalb der Abspritzlöcher 37 nicht abreißt, so daß die Austrittsöffnungen der sich zum Brennraum hin verjüngenden Abspritzlöcher 37 vollständig über ihren Querschnitt mit Brennstoff gefüllt sind. Auf diese Weise kann Verkokung verhindert werden, da keine Rezirkulation des Brennstoffs im Abspritzloch 37 auftritt.The Abspritzlöcher 37 are conically shaped and have in particular sharp exit edges 41 and a funnel-shaped inflow region 42. This hole shape has the particular advantage that the fuel flow within the Abspritzlöcher 37 does not break, so that the outlet openings of the combustion chamber towards the tapered Abspritzlöcher 37 are completely filled over its cross-section with fuel. In this way, coking can be prevented since no recirculation of the fuel in the discharge hole 37 occurs.

Die Spritzlochscheibe 36 ist flexibel anwendbar für beliebige Strahlöffnungswinkel und Neigungswinkel des Dichtsitzes sowie für beliebige statische Durchflußwerte durch das Brennstoffeinspritzventil 1.The spray perforated disk 36 is flexibly applicable for any desired jet opening angle and angle of inclination of the sealing seat as well as for any static flow values through the fuel injection valve 1.

Fig. 3 zeigt in einer auszugsweisen Schnittdarstellung in gleicher Ansicht wie Fig. 2 ein zweites Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1. Gleiche Bauteile sind dabei mit übereinstimmenden Bezugszeichen versehen. Fig. 3 shows in an excerpted sectional view in the same view as Fig. 2 A second embodiment of a fuel injection valve according to the invention 1. The same components are provided with matching reference numerals.

Im Gegensatz zu Fig. 2 sind im vorliegenden Ausführungsbeispiel der Ventilsitzkörper 5 und die Spritzlochscheibe 36 in ihrer Form aneinander angepaßt, d. h., das zwischen dem Ventilsitzkörper 5 und der Spritzlochscheibe 36 ausgebildete Volumen 39 ist kleiner als in dem in Fig. 2 dargestellten ersten Ausführungsbeispiel.In contrast to Fig. 2 are in the present embodiment, the valve seat body 5 and the spray orifice plate 36 in shape adapted to each other, ie, the formed between the valve seat body 5 and the spray orifice plate 36 volume 39 is smaller than in the in Fig. 2 illustrated first embodiment.

Die übrigen Komponenten des Brennstoffeinspritzventils 1 können identisch mit dem in Fig. 1 und 2 dargestellten Brennstoffeinspritzventil 1 ausgebildet sein.The remaining components of the fuel injection valve 1 may be identical to those in FIG Fig. 1 and 2 be formed fuel injector 1 shown.

Die Verminderung des Volumens 39 erlaubt eine Homogenisierung der Brennstoffströmung, die in den Totzeiten des Brennstoffeinspritzventils 1 nicht zum Erliegen kommt. Die Verkokung wird dadurch ebenfalls reduziert.The reduction of the volume 39 allows a homogenization of the fuel flow, which does not come to a halt in the dead times of the fuel injection valve 1. The coking is thereby also reduced.

Auch die Strömungsumlenkung wird durch die Verringerung des Volumens 39 verstärkt, wodurch die Neigung der Abspritzlöcher 37 weiter verringert werden kann und die Präzision der Herstellung der Abspritzlöcher 37 erhöht werden kann.Also, the flow deflection is enhanced by the reduction in the volume 39, whereby the inclination of the Abspritzlöcher 37 can be further reduced and the precision of the production of the Abspritzlöcher 37 can be increased.

Fig. 4 zeigt in einer ausschnittsweisen, stark schematisierten Darstellung einen Ausschnitt aus der Spritzlochscheibe 36 eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 im Bereich IV in Fig. III. Fig. 4 shows a detail of a highly schematic representation of a section of the spray perforated disk 36 of an inventively designed fuel injection valve 1 in the area IV in Fig. III.

In Fig. 4 ist der konische Verlauf der Abspritzlöcher 37 mit dem trichterförmigen Zulaufbereich 42 und den scharfen Kanten 41 deutlich erkennbar. Der engste Querschnitt der Abspritzlöcher 37 ist dabei abströmseitig ausgebildet und sorgt für eine Unterdrückung der Rezirkulation im Abspritzloch 37, da der Brennstoffstrom nicht abreißt und dadurch der Austrittsquerschnitt kontinuierlich mit Brennstoff gefüllt ist.In Fig. 4 the conical course of the Abspritzlöcher 37 with the funnel-shaped inlet region 42 and the sharp edges 41 clearly visible. The narrowest cross section of the Abspritzlöcher 37 is formed downstream and ensures a suppression of the recirculation in the Abspritzloch 37, since the fuel flow is not torn off and thereby the outlet cross-section is continuously filled with fuel.

Die Herstellung der Abspritzlöcher 37 in der Spritzlochscheibe 36 kann dabei mittels einlagiger Mikrogalvanik, Stanzen, Ätzen, oder Laserbohren erfolgen, wobei die Spritzlochscheibe 36 noch plan ist. Nach der Herstellung der Abspritzlöcher 37 wird die Spritzlochscheibe 36 beispielsweise mittels Prägen kalottiert.The preparation of the Abspritzlöcher 37 in the spray perforated disk 36 can be done by means of single-layer microplating, punching, etching, or laser drilling, the spray orifice plate 36 is still flat. After the preparation of the Abspritzlöcher 37, the spray perforated disk 36 is diced, for example by means of embossing.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. auch für nach innen öffnende Brennstoffeinspritzventile 1 beliebiger Bauweisen anwendbar.The invention is not limited to the illustrated embodiments and z. B. also for Inwardly opening fuel injectors 1 of any design applicable.

Claims (11)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, having an excitable actuator (10), having a valve needle (3) which is operatively connected to the actuator (10) and which is acted on in a closing direction by a restoring spring (23) and which serves to actuate a valve closing body (4) which, together with a valve seat surface (6) formed on a valve seat body (5), forms a sealing seat, and having a spray hole disc (36) which is arranged at the outflow side of the valve seat body (5), with the spray hole disc (36) being arched in the shape of a dome in a flow direction of the fuel,
    characterized
    in that the valve seat body (5) and the spray hole disc (36) are matched to one another in terms of their shape and
    in that a volume (39) is formed between the spray hole disc (36) and an end side (40) of the valve seat body (5) , and
    in that a reduction in size of the volume (39) causes a homogenization of the fuel flow.
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the spray hole disc (36) is arranged in a recess (34) of a nozzle body (2) of the fuel injection valve (1).
  3. Fuel injection valve according to Claim 2,
    characterized
    in that the spray hole disc (36) is fixed to the nozzle body (2) of the fuel injection valve (1) by means of a weld seam (35).
  4. Fuel injection valve according to Claim 3,
    characterized
    in that the weld seam (35) extends into the valve seat body (5).
  5. Fuel injection valve according to one of Claims 1 to 4,
    characterized
    in that a bore (7) which is arranged centrally in the valve seat body (5) is covered by the spray hole disc (36).
  6. Fuel injection valve according to one of Claims 1 to 5, characterized in that a plurality of ejection holes (37) are formed in the spray hole disc (36).
  7. Fuel injection valve according to Claim 6,
    characterized
    none of the ejection holes (37) is arranged in a longitudinal axis of the bore (7).
  8. Fuel injection valve according to Claim 6 or 7,
    characterized
    in that the ejection holes (37) are of conical design.
  9. Fuel injection valve according to Claim 8,
    characterized
    in that the ejection holes (37) taper in the flow direction of the fuel.
  10. Fuel injection valve according to Claim 9,
    characterized
    in that the ejection holes (37) have a funnel-shaped inflow region (42) at the inlet side.
  11. Fuel injection valve according to Claim 10,
    characterized
    in that the ejection holes (37) have sharp edges (41) at the outflow side.
EP02737742A 2001-04-11 2002-03-16 Fuel injection valve Expired - Lifetime EP1379778B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10118164A DE10118164B4 (en) 2001-04-11 2001-04-11 Fuel injector
DE10118164 2001-04-11
PCT/DE2002/000966 WO2002084113A1 (en) 2001-04-11 2002-03-16 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1379778A1 EP1379778A1 (en) 2004-01-14
EP1379778B1 true EP1379778B1 (en) 2010-05-19

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Family Applications (1)

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EP02737742A Expired - Lifetime EP1379778B1 (en) 2001-04-11 2002-03-16 Fuel injection valve

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US (1) US20040011894A1 (en)
EP (1) EP1379778B1 (en)
JP (1) JP2004518910A (en)
KR (1) KR20030007944A (en)
CN (1) CN1461382A (en)
DE (2) DE10118164B4 (en)
WO (1) WO2002084113A1 (en)

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Publication number Publication date
DE10118164A1 (en) 2002-10-24
US20040011894A1 (en) 2004-01-22
DE50214442D1 (en) 2010-07-01
CN1461382A (en) 2003-12-10
KR20030007944A (en) 2003-01-23
DE10118164B4 (en) 2007-02-08
JP2004518910A (en) 2004-06-24
WO2002084113A1 (en) 2002-10-24
EP1379778A1 (en) 2004-01-14

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