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EP1407135A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1407135A1
EP1407135A1 EP02742713A EP02742713A EP1407135A1 EP 1407135 A1 EP1407135 A1 EP 1407135A1 EP 02742713 A EP02742713 A EP 02742713A EP 02742713 A EP02742713 A EP 02742713A EP 1407135 A1 EP1407135 A1 EP 1407135A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
nozzle body
thread
labyrinth seal
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.)
Granted
Application number
EP02742713A
Other languages
German (de)
French (fr)
Other versions
EP1407135B1 (en
Inventor
Hubert Stier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1407135A1 publication Critical patent/EP1407135A1/en
Application granted granted Critical
Publication of EP1407135B1 publication Critical patent/EP1407135B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injector is known from DE 198 49 210 AI, which has a tubular nozzle body on its downstream side, at the downstream end of which a sealing seat and a spray opening are arranged.
  • the tubular part of the nozzle body can be inserted into a receiving bore of a cylinder head.
  • the nozzle body is sealed with a seal which approximately has the geometry of a hollow cylinder.
  • the nozzle body has a circumferential groove which is introduced, for example, by turning off the nozzle body and into which the seal is inserted.
  • Elastic materials can be used as materials, which can be pushed over the nozzle body for assembly in the groove.
  • a fuel injector is known from DE 198 08 068 AI, in which a sealing element is arranged on the nozzle body.
  • the seal is made of a metallic material and expands in the radial direction under the influence of the temperature caused by the combustion process. This can be done either through a shape memory alloy or through the use of a bimetal seal.
  • a groove can be used in the nozzle body for fixation.
  • the metal sealing ring heats up and expands. This increases the sealing effect during operation.
  • the metal gasket has a slightly smaller diameter than the location hole for the fuel injector, which is made in the cylinder head.
  • a disadvantage of the sealing solution specified in DE 198 49 210 AI is primarily the high temperature acting on the seal. In particular with direct-injection internal combustion engines, full gas resistance of non-metallic sealing materials cannot be ensured.
  • the fuel injector disclosed in DE 198 08 068 AI has the disadvantage that the sealing effect of the metallic seal is temperature-dependent. After a cold start of the internal combustion engine, it takes until the materials in the vicinity of the combustion chamber have heated up through the combustion process to such an extent that the temperature in the seal is reached due to the heat conduction, which leads to the required change in shape. Therefore, in addition to the seal presented, a further seal is required in order to seal the combustion chamber from the outside when the internal combustion engine starts to operate, so that no compression pressure is lost.
  • Another disadvantage is the complex materials that are used in the production of temperature-dependent deforming metal seals.
  • a shape memory alloy has a transition temperature that is matched to the intended use. In order to be able to guarantee this transition temperature safely, a narrow scope is usually required with regard to the manufacturing process. This increases not only the development costs for the alloy but also the costs when used in series production.
  • bimetal seal requires the seal to be fixed to the nozzle body, which serves as a counter bearing during the deformation.
  • assembly of the bimetal in a groove, for example, is difficult since the properties of the material change when one of the two metals undergoes a non-elastic deformation during assembly.
  • the fuel injector according to the invention with the characterizing feature of the main claim has the advantage that the nozzle body and a magnetic pot, in which the magnetic circuit of the fuel injector is encapsulated, are sealed from the surroundings of the fuel injector by means of a threaded labyrinth seal.
  • the labyrinth seal advantageously has two to three turns, which have a radial amplitude of approximately 0.5 mm, in order to achieve a reliable sealing effect.
  • Another advantage is that the labyrinth seal using a simple manufacturing process with the help of a Thread forming tool or an internal mandrel can be done without machining.
  • the shape of the thread is not limited to round cross sections, but can be produced in any elliptical or oval manner.
  • Fig. 1 shows a schematic partial section through an embodiment of a fuel injector according to the invention
  • Fig. 2 shows a detail from the embodiment shown in Fig. 1 of an invention
  • a fuel injector 1 shown in FIG. 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injection valve 1 comprises a sleeve-shaped nozzle body 2, in which, for example, a valve needle, not shown, can be arranged.
  • fuel injector 1 is an electromagnetically actuated fuel injector 1.
  • the nozzle body 2 reaches through a magnetic coil 3 which is wound on a coil carrier 4.
  • the magnet coil 3 is encapsulated in a magnet pot 6, which is sealed against an environment of the fuel injection valve 1 by a labyrinth seal 5 designed according to the invention.
  • FIG. 2 A detailed illustration of the labyrinth seal 5 of the fuel injection valve 1 according to the invention can be found in FIG. 2 and the following description.
  • the magnet coil 3 is excited via a line (not shown further) by an electrical current that can be supplied via an electrical plug contact 7.
  • the plug contact is surrounded by a plastic sheathing 8, which can be molded onto the nozzle body 2.
  • FIG. 2 shows an excerpted sectional view of the area designated II in FIG. 1 of the exemplary embodiment of a fuel injector 1 designed according to the invention shown in FIG. 1.
  • the solenoid 3 and the nozzle body 2 of the fuel injector 1 designed according to the invention are, as already mentioned, equipped with a labyrinth seal 5 which seals the components surrounded by the plastic casing 8 from the surroundings of the fuel injector 1 and thus protects them from e.g. B. protects dirt and salt water.
  • the labyrinth seal 5 is thread-shaped and comprises at least two, better three thread grooves 9.
  • a radial distance between a low point 10 of each thread groove 9 and a high point 11 of each thread groove should be at least 0.5 mm.
  • the shape of the thread is arbitrary. A round thread is the easiest to manufacture, but elliptical cross sections are also conceivable.
  • the labyrinth seal 5 is used to protect the area surrounded by the plastic casing 8 with the nozzle body 2 from aggressive media in the vicinity of the fuel injector 1.
  • a labyrinth seal 5 designed according to the invention according to the fuel injection valve 1 allows rotary demolding of the tool producing the labyrinth seal 5, as a result of which post-processing is eliminated and the manufacturing process is simplified and thereby less cost-intensive.
  • the labyrinth seal 5 can be produced, for example, by deep drawing or extrusion, the thread grooves 9 being produced by means of a thread-cutting tool.
  • a thread-shaped labyrinth seal 5 can also be designed by means of round hammers or round kneading with the aid of a thread-shaped inner mandrel.
  • the invention is not restricted to the exemplary embodiment shown of a fuel injection valve 1 designed according to the invention and is suitable for any construction of fuel injection valves 1.

Landscapes

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

Abstract

The invention relates to a fuel injection valve (1) for fuel injection systems of internal combustion engines, comprising an injector body (2) and an electromagnetic coil (3) which is arranged in a magnetic body (6) and crossed by the injector body (3). The valve also comprises a plastic covering (8) which at least partially covers the injector body (3). The injector body (2) and the magnetic body (6) are sealed by means of a spiral labyrinth seal (5) relative to the area surrounding the fuel injection valve (1).

Description

Brennstoffeinspritzventil Fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injector according to the preamble of the main claim.
Beispielsweise ist aus der DE 198 49 210 AI ein Brennstoffeinspritzventil bekannt, das einen auf seiner stromabwärtigen Seite rohrförmigen Düsenkörper aufweist, an dessen stromabwärtigen Ende ein Dichtsitz und eine Abspritzöffnung angeordnet sind. Der rohrförmige Teil des Düsenkörpers ist in eine Aufnahmebohrung eines Zyl inderkopfs einführbar. Gegenüber der Aufnahmebohrung des Zylinderkopfs , die einen mit der radialen Ausdehnung des Düsenkörpers korrespondierenden Durchmesser aufweist, ist der Düsenkörper mit einer Dichtung abgedichtet, die näherungsweise die Geometrie eines Hohlzylinders aufweist.For example, a fuel injector is known from DE 198 49 210 AI, which has a tubular nozzle body on its downstream side, at the downstream end of which a sealing seat and a spray opening are arranged. The tubular part of the nozzle body can be inserted into a receiving bore of a cylinder head. Compared to the receiving bore of the cylinder head, which has a diameter corresponding to the radial extent of the nozzle body, the nozzle body is sealed with a seal which approximately has the geometry of a hollow cylinder.
Zur Lagefixierung der Dichtung auf dem Düsenkörper weist der Düsenkörper eine umlaufende Nut auf, die beispielsweise durch Abdrehen des Düsenkörpers eingebracht wird und in die die Dichtung eingesetzt wird. Als Materialien können elastische Materialien eingesetzt werden, die sich zur Montage in der Nut über den Düsenkörper schieben lassen. Weiterhin ist auch aus der DE 198 08 068 AI ein Brennstoffeinspritzventil bekannt, bei dem auf dem Düsenkörper ein Dichtelement angeordnet ist. Die Dichtung ist aus einem metallischen Werkstoff und dehnt sich in radiale Richtung unter dem Einfluß der Temperatur, die durch den Verbrennungsvorgang entsteht, aus. Dies kann entweder durch eine Formgedächtnislegierung geschehen oder durch die Verwendung einer Bimetalldichtung. Zur Fixierung kann wie bei der DE 198 49 210 AI eine Nut in dem Düsenkörper verwendet werden.In order to fix the seal on the nozzle body, the nozzle body has a circumferential groove which is introduced, for example, by turning off the nozzle body and into which the seal is inserted. Elastic materials can be used as materials, which can be pushed over the nozzle body for assembly in the groove. Furthermore, a fuel injector is known from DE 198 08 068 AI, in which a sealing element is arranged on the nozzle body. The seal is made of a metallic material and expands in the radial direction under the influence of the temperature caused by the combustion process. This can be done either through a shape memory alloy or through the use of a bimetal seal. As in DE 198 49 210 AI, a groove can be used in the nozzle body for fixation.
Im Betrieb der Brennkraftmaschine erwärmt sich der Metalldichtring und dehnt sich aus. Damit wird im Betrieb die Dichtwirkung erhöht. Zur leichteren Montage weist die Metalldichtung einen geringfügig kleineren Durchmesser auf, als die Aufnahmebohrung für das Brennstoffeinspritzventil , die in den Zylinderkopf eingebracht ist.When the internal combustion engine is operating, the metal sealing ring heats up and expands. This increases the sealing effect during operation. For easier assembly, the metal gasket has a slightly smaller diameter than the location hole for the fuel injector, which is made in the cylinder head.
Nachteilig bei der in der DE 198 49 210 AI angegebenen Dichtungslösung ist in erster Linie die auf die Dichtung einwirkende hohe Temperatur. Insbesondere bei direkteinspritzenden Brennkraftmaschinen ist eine Vollgasfestigkeit nichtmetallischer Dichtungsmaterialien nicht sicherzustellen.A disadvantage of the sealing solution specified in DE 198 49 210 AI is primarily the high temperature acting on the seal. In particular with direct-injection internal combustion engines, full gas resistance of non-metallic sealing materials cannot be ensured.
Das in der DE 198 08 068 AI offenbarte Brennstoffeinspritzventil hat den Nachteil, daß die Dichtwirkung der metallischen Dichtung temperaturabhängig ist. Nach einem Kaltstart der Brennkraftmaschine dauert es, bis sich durch den Verbrennungsvorgang die Materialien im Umfeld des Brennraums soweit erwärmt haben, daß durch die Wärmeleitung die Temperatur in der Dichtung erreicht ist, welche zu der erforderlichen Formänderung führt. Daher ist zusätzlich zu der vorgestellten Dichtung eine weitere Dichtung erforderlich, um den Brennraum bei Betriebsbeginn der Brennkraftmaschine gegen den Außenraum abzudichten, so daß kein Kompressionsdruck verloren geht. Weiterhin nachteilig sind die aufwendigen Materialien, die bei der Herstellung sich temperaturabhängig verformender Metalldichtungen zum Einsatz kommen. Eine Formgedächtnislegierung weist eine auf den Einsatzzweck abgestimmte Übergangstemperatur auf. Um diese Übergangstemperatur sicher gewährleisten zu können, ist meist ein enger Spielraum hinsichtlich des Herstellverfahrens erforderlich. Dadurch werden nicht nur die Entwicklungskosten für die Legierung sondern auch die Kosten bei einem Einsatz in einer Serienfertigung erhöht.The fuel injector disclosed in DE 198 08 068 AI has the disadvantage that the sealing effect of the metallic seal is temperature-dependent. After a cold start of the internal combustion engine, it takes until the materials in the vicinity of the combustion chamber have heated up through the combustion process to such an extent that the temperature in the seal is reached due to the heat conduction, which leads to the required change in shape. Therefore, in addition to the seal presented, a further seal is required in order to seal the combustion chamber from the outside when the internal combustion engine starts to operate, so that no compression pressure is lost. Another disadvantage is the complex materials that are used in the production of temperature-dependent deforming metal seals. A shape memory alloy has a transition temperature that is matched to the intended use. In order to be able to guarantee this transition temperature safely, a narrow scope is usually required with regard to the manufacturing process. This increases not only the development costs for the alloy but also the costs when used in series production.
Die Verwendung einer Bimetalldichtung erfordert eine Fixierung der Dichtung an dem Düsenkörper, der bei der Verformung als Gegenlager dient. Eine Montage des Bimetalls in einer Nut beispielsweise ist jedoch schwierig, da sich die Eigenschaften des Materials ändern, wenn eines der beiden Metalle eine nicht elastische Verformung bei der Montage erf hrt .The use of a bimetal seal requires the seal to be fixed to the nozzle body, which serves as a counter bearing during the deformation. However, assembly of the bimetal in a groove, for example, is difficult since the properties of the material change when one of the two metals undergoes a non-elastic deformation during assembly.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit dem kennzeichnenden Merkmal des Hauptanspruchs hat demgegenüber den Vorteil, daß der Düsenkörper und ein Magnettopf, in welchem der Magnetkreis des Brennstoffeinspritzventils gekapselt ist, mittels einer gewindeförmigen Labyrinthdichtung gegenüber einer Umgebung des Brennstoffeinspritzventils abgedichtet sind.The fuel injector according to the invention with the characterizing feature of the main claim has the advantage that the nozzle body and a magnetic pot, in which the magnetic circuit of the fuel injector is encapsulated, are sealed from the surroundings of the fuel injector by means of a threaded labyrinth seal.
Gemäß den in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des erfindungsgemäßen Brennstoffeinspritzventils möglich .According to the measures listed in the subclaims, advantageous developments of the fuel injector according to the invention are possible.
Vorteilhafterweise weist die Labyrinthdichtung zwei bis drei Windungen auf, welche eine radiale Amplitude von ca. 0,5 mm aufweisen, um eine zuverlässige Dichtwirkung zu erzielen.The labyrinth seal advantageously has two to three turns, which have a radial amplitude of approximately 0.5 mm, in order to achieve a reliable sealing effect.
Weiterhin ist von Vorteil, daß die Labyrinthdichtung mittels einfacher Herstellungsverfahren unter Zuhilfenahme eines Gewindefurchwerkzeugs oder eines Innendorns ohne spanende Nachbearbeitung erfolgen kann.Another advantage is that the labyrinth seal using a simple manufacturing process with the help of a Thread forming tool or an internal mandrel can be done without machining.
Von Vorteil ist auch, daß die Form des Gewindes nicht auf runde Querschnitte beschränkt ist, sondern beliebig ellipsenförmig oder oval herstellbar ist.It is also advantageous that the shape of the thread is not limited to round cross sections, but can be produced in any elliptical or oval manner.
Zeichnungdrawing
Ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils ist in der Zeichnung vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert . Es zeigt :An embodiment of a fuel injection valve according to the invention is shown in simplified form in the drawing and is explained in more detail in the following description. It shows :
Fig. 1 einen schematischen Teilschnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils, undFig. 1 shows a schematic partial section through an embodiment of a fuel injector according to the invention, and
Fig. 2 einen Ausschnitt aus dem in Fig. 1 dargestellten Ausführungsbeispiel eines erfindungsgemäßFig. 2 shows a detail from the embodiment shown in Fig. 1 of an invention
Brennstoffeinspritzventils 1 im Bereich II in Fig. 1.Fuel injection valve 1 in area II in FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Ein in Fig. 1 dargestelltes Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgefüh.rt . Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.A fuel injector 1 shown in FIG. 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines. The fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
Das Brennstoffeinspritzventil 1 umfaßt einen hülsenförmigen Düsenkörper 2, in welchem beispielsweise eine nicht weiter dargestellte Ventilnadel angeordnet sein kann. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein elektromagnetisch betätigtes Brennstoffeinspritzventil ι. Der Dusenkorper 2 durchgreift eine Magnetspule 3, welche auf einen Spulenträger 4 gewickelt ist. Die Magnetspule 3 ist in einem Magnettopf 6 gekapselt, welcher durch eine erfindungsgemäß ausgestaltete Labyrinthdichtung 5 gegen eine Umgebung des Brennstoffeinspritzventils 1 abgedichtet ist.The fuel injection valve 1 comprises a sleeve-shaped nozzle body 2, in which, for example, a valve needle, not shown, can be arranged. In the exemplary embodiment, fuel injector 1 is an electromagnetically actuated fuel injector 1. The nozzle body 2 reaches through a magnetic coil 3 which is wound on a coil carrier 4. The magnet coil 3 is encapsulated in a magnet pot 6, which is sealed against an environment of the fuel injection valve 1 by a labyrinth seal 5 designed according to the invention.
Eine detaillierte Darstellung der Labyrinthdichtung 5 des erfindungsgemäßen Brennstoffeinspritzventils 1 ist Fig. 2 und der nachfolgenden Beschreibung zu entnehmen.A detailed illustration of the labyrinth seal 5 of the fuel injection valve 1 according to the invention can be found in FIG. 2 and the following description.
Die Magnetspule 3 wird über eine nicht weiter dargestellte Leitung von einem über einen elektrischen Steckkontakt 7 zuführbaren elektrischen Strom erregt . Der Steckkontakt ist von einer Kunststoffummantelung 8 umgeben, die am Dusenkorper 2 angespritzt sein kann.The magnet coil 3 is excited via a line (not shown further) by an electrical current that can be supplied via an electrical plug contact 7. The plug contact is surrounded by a plastic sheathing 8, which can be molded onto the nozzle body 2.
Fig. 2 zeigt in einer auszugsweisen Schnittdarstellung den in Fig. 1 mit II bezeichneten Bereich des in Fig. 1 dargestellten Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1.FIG. 2 shows an excerpted sectional view of the area designated II in FIG. 1 of the exemplary embodiment of a fuel injector 1 designed according to the invention shown in FIG. 1.
Die Magnetspule 3 und der Düsenkörper 2 des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 sind, wie bereits erwähnt, mit einer Labyrinthdichtung 5 ausgestattet, welche die von der Kunststoffummantelung 8 umgebenen Bauteile gegenüber der Umgebung des Brennstoffeinspritzventils 1 abdichtet und diese somit vor z. B. Schmutz und Salzwasser schützt.The solenoid 3 and the nozzle body 2 of the fuel injector 1 designed according to the invention are, as already mentioned, equipped with a labyrinth seal 5 which seals the components surrounded by the plastic casing 8 from the surroundings of the fuel injector 1 and thus protects them from e.g. B. protects dirt and salt water.
Die Labyrinthdichtung 5 ist dabei gewindeförmig ausgeführt und umfaßt zumindest zwei, besser drei Gewinderillen 9. Ein radialer Abstand zwischen einem Tiefpunkt 10 jeder Gewinderille 9 und einem Hochpunkt 11 jeder Gewinderille sollte dabei zumindest 0,5 mm betragen.The labyrinth seal 5 is thread-shaped and comprises at least two, better three thread grooves 9. A radial distance between a low point 10 of each thread groove 9 and a high point 11 of each thread groove should be at least 0.5 mm.
Die Form des Gewindes ist dabei beliebig. Am einfachsten herstellbar ist ein Rundgewinde, es sind jedoch auch elliptische Querschnitte denkbar. Die Labyrinthdichtung 5 wird eingesetzt, um den von der Kunststoffummantelung 8 umgebenen Bereich mit dem Düsenkörper 2 vor aggressiven Medien in der Umgebung des Brennstoffeinspritzventils 1 zu schützen. Eine gemäß dem erfindungsgemäßen Brennstoffeinspritzventil 1 gewindeförmig ausgestaltete Labyrinthdichtung 5 erlaubt eine rotatorische Entformung des die Labyrinthdichtung 5 herstellenden Werkzeugs, wodurch Nachbearbeitungen entfallen und der Herstellungsprozeß vereinfacht und dadurch weniger kostenintensiv wird.The shape of the thread is arbitrary. A round thread is the easiest to manufacture, but elliptical cross sections are also conceivable. The labyrinth seal 5 is used to protect the area surrounded by the plastic casing 8 with the nozzle body 2 from aggressive media in the vicinity of the fuel injector 1. A labyrinth seal 5 designed according to the invention according to the fuel injection valve 1 allows rotary demolding of the tool producing the labyrinth seal 5, as a result of which post-processing is eliminated and the manufacturing process is simplified and thereby less cost-intensive.
Die Labyrinthdichtung 5 ist beispielsweise durch Tiefziehen oder Fließpressen herstellbar, wobei die Gewinderillen 9 mittels eines Gewindefurchwerkzeugs angefertigt werden. Auch mittels Rundhäm erns oder Rundknetens kann unter Zuhilfenahme eines gewindeförmigen Innendorns eine gewindeförmige Labyrinthdichtung 5 gestaltet werden.The labyrinth seal 5 can be produced, for example, by deep drawing or extrusion, the thread grooves 9 being produced by means of a thread-cutting tool. A thread-shaped labyrinth seal 5 can also be designed by means of round hammers or round kneading with the aid of a thread-shaped inner mandrel.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1 geeignet. The invention is not restricted to the exemplary embodiment shown of a fuel injection valve 1 designed according to the invention and is suitable for any construction of fuel injection valves 1.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) für1. Fuel injector (1) for
Brennstoffeinspritzanlagen von Brennkraftmaschinen mit einem Dusenkorper (2) und einer in einem Magnettopf (6) angeordneten Magnetspule (3), welche von dem Düsenkörper (2) durchgriffen ist, und einer Kunststoffummantelung (8), welche den Düsenkörper (2) zumindest teilweise umgibt, dadurch gekennzeichnet, daß der Düsenkörper (2) und der Magnettopf (6) mittels einer gewindeförmigen Labyrinthdichtung (5) gegenüber einer Umgebung des Brennstoffeinspritzventils (1) abgedichtet sind.Fuel injection systems of internal combustion engines with a nozzle body (2) and a magnetic coil (3) arranged in a magnetic pot (6), which is penetrated by the nozzle body (2), and a plastic sheath (8) which at least partially surrounds the nozzle body (2), characterized in that the nozzle body (2) and the magnet pot (6) are sealed off from the surroundings of the fuel injection valve (1) by means of a thread-shaped labyrinth seal (5).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Labyrinthdichtung (5) zumindest zwei Gewinderillen (9) aufweist.2. Fuel injection valve according to claim 1, characterized in that the labyrinth seal (5) has at least two thread grooves (9).
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß eine radiale Distanz zwischen einem radial inneren Tiefpunkt (10) und einem radial äußeren Hochpunkt (11) der Gewinderillen (9) zumindest 0 , 5 mm beträgt.3. Fuel injection valve according to claim 2, characterized in that a radial distance between a radially inner low point (10) and a radially outer high point (11) of the thread grooves (9) is at least 0.5 mm.
4. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, . dadurch gekennzeichnet, daß die Labyrinthdichtung (5) durch Tiefziehen, Fließpressen oder Rundhämmern hergestellt ist.4. Fuel injection valve according to one of claims 1 to 3,. characterized in that the labyrinth seal (5) is produced by deep drawing, extrusion or round hammers.
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß die Gewinderillen (9) der Labyrinthdichεung (5) mittels eines Gewindefurchwerkzeugs oder eines gewindeförmigen5. Fuel injection valve according to claim 4, characterized in that the thread grooves (9) of the labyrinth seal (5) by means of a thread forming tool or a thread-shaped
Innendorns hergestellt sind.Internal mandrel are made.
6. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis6. Fuel injection valve according to one of claims 1 to
5, dadurch gekennzeichnet, daß die Gewinderillen (9) einen runden, ovalen oder elliptischen Querschnitt aufweisen. 5, characterized in that the thread grooves (9) have a round, oval or elliptical cross section.
EP02742713A 2001-07-09 2002-05-07 Fuel injection valve Expired - Lifetime EP1407135B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10133263A DE10133263A1 (en) 2001-07-09 2001-07-09 Fuel injector
DE10133263 2001-07-09
PCT/DE2002/001634 WO2003006819A1 (en) 2001-07-09 2002-05-07 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1407135A1 true EP1407135A1 (en) 2004-04-14
EP1407135B1 EP1407135B1 (en) 2006-07-12

Family

ID=7691145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02742713A Expired - Lifetime EP1407135B1 (en) 2001-07-09 2002-05-07 Fuel injection valve

Country Status (6)

Country Link
US (1) US7048253B2 (en)
EP (1) EP1407135B1 (en)
JP (1) JP2004521270A (en)
KR (1) KR100853643B1 (en)
DE (2) DE10133263A1 (en)
WO (1) WO2003006819A1 (en)

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US8763362B1 (en) * 2008-10-03 2014-07-01 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Injector element which maintains a constant mean spray angle and optimum pressure drop during throttling by varying the geometry of tangential inlets

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Also Published As

Publication number Publication date
DE10133263A1 (en) 2003-02-06
US7048253B2 (en) 2006-05-23
US20040026646A1 (en) 2004-02-12
KR100853643B1 (en) 2008-08-25
KR20030036755A (en) 2003-05-09
DE50207511D1 (en) 2006-08-24
EP1407135B1 (en) 2006-07-12
WO2003006819A1 (en) 2003-01-23
JP2004521270A (en) 2004-07-15

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