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EP2321521B1 - Fuel injection valve for arrangement in a combustion chamber of an internal combustion engine - Google Patents

Fuel injection valve for arrangement in a combustion chamber of an internal combustion engine Download PDF

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Publication number
EP2321521B1
EP2321521B1 EP09779830.0A EP09779830A EP2321521B1 EP 2321521 B1 EP2321521 B1 EP 2321521B1 EP 09779830 A EP09779830 A EP 09779830A EP 2321521 B1 EP2321521 B1 EP 2321521B1
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EP
European Patent Office
Prior art keywords
combustion chamber
nozzle
sealing element
nozzle body
injection valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09779830.0A
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German (de)
French (fr)
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EP2321521A1 (en
Inventor
Thomas Hofmann
Michael HÄRTEL
Uwe Leuteritz
Ferdinand Löbbering
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.)
Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
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Publication of EP2321521A1 publication Critical patent/EP2321521A1/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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a fuel injection valve for arrangement on a combustion chamber of an internal combustion engine comprising a nozzle holder, on which a nozzle body clamped by a nozzle clamping nut, designed to protrude into the combustion chamber nozzle nozzle for receiving a nozzle needle is arranged, and at least one annular disk-shaped sealing element with an upper bearing surface facing the nozzle retaining nut and a combustion chamber facing the lower support surface which surrounds the nozzle body and serves to seal the nozzle holder relative to the combustion chamber.
  • a nozzle retaining nut holds the two main components of the fuel injector - an injector and a valve body - firmly together.
  • the injection nozzle protrudes in the assembled state of the fuel injector in the cylinder head into a combustion chamber of a motor vehicle engine, wherein the valve body arranged above actuates the injection nozzle.
  • the sealing arrangement is exposed to high thermal loads (-40 ° C at cold start in winter, to over +150 ° C) under operating conditions and on the other hand, the sealing device is exposed to high mechanical, in particular vibration loads.
  • the sealing arrangement must ensure a long-lasting loads, permanent sealing state between the fuel injector and the cylinder head.
  • the injector is sealed to the combustion chamber with a metal washer. This seal is necessary because of the hot exhaust gases and the pressure loss in the cylinder. Due to the high combustion temperatures and high cylinder pressures, sealing is only possible with a metal sealing disk, so that no combustion gases can flow directly past the injector into the environment.
  • a nozzle retaining nut at a free end has a frusto-conical region which can be inserted into a corresponding frusto-conical injector bore section.
  • the preassembled state that is, when the fuel injector is inserted with nozzle retaining nut in the frusto-conical Injektorbohrung, there is a circumferential angle difference of 2 ° to a maximum of 5 ° between the truncated cone on the nozzle retaining nut and the truncated cone bore in the cylinder head.
  • the protection of the nozzle body from heat by coating and the installation of sleeves as heat sinks is known.
  • the GB 1262164 discloses a copper sleeve for an injector for better heat dissipation.
  • new combustion processes seem to ensure corrosion in this area, so that a direct seal in this area against corrosive substances from combustion gases is absolutely necessary.
  • FIG. 1 shows partially in longitudinal section a detail of a fuel injection valve 10 with a nozzle retaining nut 20, which clamps a nozzle body 30.
  • Schematically indicated at 40 is a combustion chamber in which the nozzle body 30 partially protrudes.
  • a combustion chamber sealing element 50 is arranged at the interface nozzle retaining nut 20, nozzle body 30 and combustion chamber 40.
  • the combustion chamber sealing element 50 comprises the part of the nozzle body 30 protruding beyond the nozzle retaining nut 20.
  • the nozzle body 30 has a circular or annular cross-section in the longitudinal direction, that is to say in the injection direction.
  • the combustion chamber sealing element 50 likewise has a corresponding annular cross section in the longitudinal direction.
  • the outer diameter of the nozzle body cross section corresponds approximately to the inner diameter of the recess of the combustion chamber sealing element 50 (annular recess).
  • the combustion chamber sealing element 50 has two end faces or bearing surfaces, an upper bearing surface 60, which faces the nozzle retaining nut 20, and a lower bearing surface 70, which faces the combustion chamber 40.
  • FIG. 2 shows in longitudinal section a corresponding section according to FIG. 1 , wherein a further sealing element 80 is provided.
  • This sealing element surrounds the nozzle body 30 in the region of a shoulder 90 of the nozzle body 30 in the contact area of the nozzle retaining nut 20 and the combustion chamber sealing element 50.
  • the sealing element 80 may be formed as a separate ring element, which consists of very soft metals, heat-resistant polymers or other fuel-resistant materials.
  • the inner diameter of this annular sealing element 50 corresponds approximately to the outer diameter of the nozzle body 30 so that it can be applied to the latter from the combustion chamber end of the nozzle body.
  • FIG. 2A shows the enlarged area A. FIG. 2 , It can be seen that the sealing element 80 comes into abutment with the nozzle body 30 of the nozzle retaining nut 20 and the combustion chamber sealing element 50 in the assembled state of the fuel injection valve.
  • FIG. 3 shows the same section as FIG. 2a wherein the sealing element 180 is formed here by vulcanizing a sealing area to the nozzle retaining nut 20.
  • the vulcanization of the sealing element 180 takes place before the mounting of the combustion chamber sealing element 50.
  • the sealing element 180 thus stands out as FIG. 3 can be seen only in contact with the nozzle body 30 and the nozzle retaining nut 20. A contact in the assembled state even with the combustion chamber sealing element 50 is not excluded.
  • FIG. 4 also shows the section corresponding to the FIG. 2A , Also in this embodiment, a sealing member 280 is formed by the scorching. In contrast to FIG. 3 However, the vulcanization of the sealing element 280 is carried out to the combustion chamber sealing element 50, namely in the region between the outer circumference of the nozzle body and in the inner circumference of the combustion chamber sealing element 50.
  • FIG. 5 shows the the FIG. 2A corresponding section of the fuel injection valve.
  • the gap formed by the shoulder of the nozzle body 30, the nozzle lock nut 20, and the combustion chamber seal member 50 is filled with a heat-resistant potting compound as the seal member 380.
  • This potting compound is introduced after the screwing of the nozzle retaining nut 20 with the nozzle body 30. As a result, the seal member 380 abuts the nozzle body 30 and the nozzle lock nut 20.
  • FIGS. 6 to 8 show embodiments of the invention in which by a geometric modification of the combustion chamber sealing member 150, 250, 350, a further additional seal is formed to seal against deposits by unburned mixture and exhaust gases in the gap between the nozzle lock nut 20 and nozzle body 30.
  • an annular disk-shaped combustion chamber sealing element 150 is shown, which in the region of its inner diameter, radially inwardly, has a tongue 100 formed longitudinally in the axial direction towards the combustion chamber.
  • This tongue 100 is in the cross-section of the combustion chamber sealing member 150 tapering radially inwardly below (toward the combustion chamber 40) formed so far that a sealing contact with the outer peripheral surface of the nozzle body 30 is made.
  • FIG. 7 also shows an annular disk-shaped combustion chamber sealing element 250 with a tongue 200, which is formed in the axial direction of the fuel injection valve from the combustion chamber 40 away.
  • the tongue 200 also runs in a tapered manner in cross-section of the combustion chamber sealing element 250 and forms a sealing contact with the nozzle body 30 in the region of the shoulder 90 of the nozzle body 30.
  • annular disk shaped combustion chamber sealing member 350 is shown in FIG. 8 .
  • this combustion chamber sealing element 350 tapers uniformly radially inwards and runs in cross section tapered to the outer diameter of the nozzle body and forms a sealing contact with this.
  • the sealing takes place via a tongue 300, which is rectangular in cross section, of the combustion chamber sealing element 350.
  • FIG. 9 shows a sealing element 400 which is formed by a radially inwardly projecting tongue on the nozzle lock nut 120.
  • the nozzle retaining nut 120 has at its region adjacent to the combustion chamber sealing element 50 an extension 400 which protrudes radially inward to such an extent that it comes into sealing contact with the nozzle body 30 in the region of the shoulder 90.
  • the tongue 400 is shown tapered in the present case, but may also have a different cross-sectional shape thereof.

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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

Die Erfindung betrifft ein Kraftstoffeinspritzventil zur Anordnung an einem Brennraum einer Brennkraftmaschine umfassend einen Düsenhalter, an dem ein über eine Düsenspannmutter festgespannter, zum Hineinragen in den Brennraum ausgebildeter Düsenkörper zur Aufnahme einer Düsennadel angeordnet ist, und mindestens ein ringscheibenförmiges Dichtelement mit einer der Düsenspannmutter zugewandten oberen Auflagefläche und einer dem Brennraum zugewandten unteren Auflagefläche, welches den Düsenkörper umgibt und zur Abdichtung des Düsenhalters gegenüber dem Brennraum dient.The invention relates to a fuel injection valve for arrangement on a combustion chamber of an internal combustion engine comprising a nozzle holder, on which a nozzle body clamped by a nozzle clamping nut, designed to protrude into the combustion chamber nozzle nozzle for receiving a nozzle needle is arranged, and at least one annular disk-shaped sealing element with an upper bearing surface facing the nozzle retaining nut and a combustion chamber facing the lower support surface which surrounds the nozzle body and serves to seal the nozzle holder relative to the combustion chamber.

Eine Düsenspannmutter hält die beiden Hauptkomponenten des Kraftstoffinjektors - eine Einspritzdüse und einen Ventilkörper - fest zusammen. Die Einspritzdüse ragt im montierten Zustand des Kraftstoffinjektors im Zylinderkopf in einen Brennraum eines Kraftfahrzeugmotors hineinen, wobei der darüber angeordnete Ventilkörper die Einspritzdüse betätigt. Hierbei ist es notwendig, den Kraftstoffinjektor gegenüber dem Brennraum am Zylinderkopf abzudichten. Dies geschieht durch eine entsprechende Gestaltung der Düsenspannmutter, die mit einer entsprechenden Einrichtung, einem Dichtsitz, im Zylinderkopf zusammenwirkt.A nozzle retaining nut holds the two main components of the fuel injector - an injector and a valve body - firmly together. The injection nozzle protrudes in the assembled state of the fuel injector in the cylinder head into a combustion chamber of a motor vehicle engine, wherein the valve body arranged above actuates the injection nozzle. In this case, it is necessary to seal the fuel injector with respect to the combustion chamber on the cylinder head. This is done by a corresponding design of the nozzle retaining nut, which cooperates with a corresponding device, a sealing seat in the cylinder head.

An eine solche Dichtanordnung sind hohe Anforderungen gestellt. Einerseits ist die Dichtanordnung hohen thermischen Belastungen ausgesetzt (-40 °C bei Kaltstart im Winter, bis über +150 °C) bei Betriebsbedingungen und andererseits ist die Dichteinrichtung hohen mechanischen, insbesondere Vibrationsbelastungen, ausgesetzt. Darüber hinaus muss die Dichtanordnung einen lang anhaltenden Belastungen, dauerhaften Dichtzustand zwischen Kraftstoffinjektor und Zylinderkopf gewährleisten.At such a sealing arrangement high demands are made. On the one hand, the sealing arrangement is exposed to high thermal loads (-40 ° C at cold start in winter, to over +150 ° C) under operating conditions and on the other hand, the sealing device is exposed to high mechanical, in particular vibration loads. In addition, the sealing arrangement must ensure a long-lasting loads, permanent sealing state between the fuel injector and the cylinder head.

Hierfür wird im Stand der Technik z. B. an der Düsenspannmutter ein horizontaler Rand ausgebildet, welcher an einem in der Injektorbohrung vorgesehenen, ebenfalls horizontalen Rand ansitzt, und die Düsenspannmutter bzw. der Kraftstoffinjektor wird mit einer großen statischen Kraft gegen den Zylinderkopf gepresst. Durch das Vorsehen einer großen flächenmäßigen Überdeckung der beiden Ränder soll eine dauerhafte fluiddichte Verbindung geschaffen werden.For this purpose, in the prior art z. B. on the nozzle retaining nut formed a horizontal edge, which ansitzt at a provided in the Injektorbohrung, also horizontal edge ansitzt, and the nozzle lock nut and the fuel injector is pressed with a large static force against the cylinder head. By providing a large surface coverage of the two edges a permanent fluid-tight connection is to be created.

Im Allgemeinen wird der Injektor mit einer Metalldichtscheibe zum Verbrennungsraum hin abgedichtet. Diese Abdichtung ist wegen der heißen Abgase und dem Druckverlust im Zylinder notwendig. Durch die hohen Verbrennungstemperaturen und hohen Zylinderdrücke ist eine Abdichtung nur mit einer Metalldichtscheibe möglich, so dass keine Verbrennungsgase direkt am Injektor vorbei, in die Umgebung strömen können.In general, the injector is sealed to the combustion chamber with a metal washer. This seal is necessary because of the hot exhaust gases and the pressure loss in the cylinder. Due to the high combustion temperatures and high cylinder pressures, sealing is only possible with a metal sealing disk, so that no combustion gases can flow directly past the injector into the environment.

In der DE 101 02192 A1 weißt eine Düsenspannmutter an einem freien Ende einen kegelstumpfförmigen Bereich auf, welcher in einen entsprechenden kegelstumpfförmigen Injektorbohrungsabschnitt einsetzbar ist. Im vormontierten Zustand, also wenn der Kraftstoffinjektor mit Düsenspannmutter in die kegelstumpfförmige Injektorbohrung eingesetzt ist, besteht zwischen Kegelstumpf an der Düsenspannmutter und der Kegelstumpfbohrung im Zylinderkopf eine umlaufende Winkeldifferenz von 2° bis maximal 5°. Hierdurch ist eine Zentrierung des Kraftstoffinjektors in der Injektorbohrung sichergestellt, wobei anschließend der Kraftstoffinjektor mit einer großen statischen Kraft in die Bohrung gedrückt wird und sich zwischen dem Kegelstumpf eine Düsenspannmutter und der Kegelbogen im Zylinderkopf eine gemeinsame Dichtfläche ausbildet.In the DE 101 02192 A1 A nozzle retaining nut at a free end has a frusto-conical region which can be inserted into a corresponding frusto-conical injector bore section. In the preassembled state, that is, when the fuel injector is inserted with nozzle retaining nut in the frusto-conical Injektorbohrung, there is a circumferential angle difference of 2 ° to a maximum of 5 ° between the truncated cone on the nozzle retaining nut and the truncated cone bore in the cylinder head. As a result, a centering of the fuel injector is ensured in the Injektorbohrung, in which case the fuel injector is pressed with a large static force in the bore and formed between the truncated cone a nozzle retaining nut and the bow in the cylinder head a common sealing surface.

Gemisch und die heißen Verbrennungsgasen strömen bis an die Dichtstellen von Düsenspannmutter und Düsenkörper, wie auch der Abdichtung zwischen Injektor und Zylinderkopf. In diesem Spalt lagert sich nun das unverbrannte Gemisch und die Abgase, z. B. H2O und S ab. Nach dem Abstellen des Motors kann es nun in der Auskühlphase zur Kondensation von Elektrolyten (Wasser) führen. Der Elektrolyt vergünstigt den Ionenaustausch und damit die Korrosion.Mixture and the hot combustion gases flow to the sealing points of nozzle retaining nut and nozzle body, as well as the seal between injector and cylinder head. In this gap, now the unburned mixture and the exhaust gases, z. B. H 2 O and S from. After stopping the engine, it can now be used in the cooling phase for the condensation of electrolytes (Water) lead. The electrolyte reduces the ion exchange and thus the corrosion.

Im Stand der Technik ist es weiter bekannt, die Düse mit der Düsenspannmutter ohne weiter zusätzliche Abdichtungen festzuschrauben. Die DE 10 2004 049 277 A1 schlägt vor, ein Dämpfungselement zwischen Injektor und Zylinderkopf einzubauen zur Reduzierung von Schwingungsübertragungen. Aus der US 2005/0016501 A1 ist eine aus mehreren Teilen zusammengesetzte Dichtvorrichtung zwischen Injektor und Zylinderkopfausnehmung bekannt. Auch die US 3 695 235 beschreibt eine mehrteilige Dichtungsanordnung zwischen Zylinderkopfausnehmung und Injektor.In the prior art, it is further known to screw the nozzle with the nozzle locknut without further additional seals. The DE 10 2004 049 277 A1 proposes to install a damping element between injector and cylinder head to reduce vibration transmission. From the US 2005/0016501 A1 is a composite of several parts sealing device between the injector and Zylinderkopfausnehmung known. Also the US Pat. No. 3,695,235 describes a multi-part seal arrangement between cylinder head recess and injector.

Des Weiteren ist der Schutz des Düsenkörpers vor Wärme durch Beschichten und der Einbau von Hülsen als Wärmeableitungen bekannt. Beispielsweise ist aus der US 2002/0152995 A1 eine Hülse als Hitzeschutz für den Düsenkörper bekannt. Die GB 1262164 offenbart eine Kupferhülse für einen Injektor für eine bessere Wärmeableitung. Neue Verbrennungsverfahren scheinen aber genau in diesem Bereich für Korrosion zu sorgen, so dass eine direkte Abdichtung in diesem Bereich vor korrosiv wirkenden Substanzen aus Verbrennungsgasen zwingend erforderlich ist.Furthermore, the protection of the nozzle body from heat by coating and the installation of sleeves as heat sinks is known. For example, is from the US 2002/0152995 A1 a sleeve known as heat protection for the nozzle body. The GB 1262164 discloses a copper sleeve for an injector for better heat dissipation. However, new combustion processes seem to ensure corrosion in this area, so that a direct seal in this area against corrosive substances from combustion gases is absolutely necessary.

Es ist daher Aufgabe der vorliegenden Erfindung, ein Kraftstoffeinspritzventil zur Anordnung an einem Brennraum einer Brennkraftmaschine bereitzustellen, welcher eine verbesserte Abdichtung des Düsenschaftes im Bereich der Düsenspannmutter zum Brennraum vorsieht.It is therefore an object of the present invention to provide a fuel injection valve for arrangement on a combustion chamber of an internal combustion engine, which provides for improved sealing of the nozzle shaft in the region of the nozzle retaining nut to the combustion chamber.

Diese Aufgabe wird ausgehend von einem Kraftstoffeinspritzventil gemäß dem Oberbegriff des Anspruchs 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Die nachfolgenden abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.This object is achieved on the basis of a fuel injection valve according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention.

Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Zeichnungen näher erläutert. In der Zeichnung zeigen:

Figur 1:
einen über eine Düsenspannmutter festgespannten Düsenkörper wie im Stand der Technik bekannt;
Figur 2:
die Anordnung nach Figur 1 mit einer nicht zur Erfindung gehörigen ersten zusätzlichen, separaten Abdichtung;
Figur 2a:
einen Teilausschnitt A der Figur 2;
Figur 3:
einen Ausschnitt entsprechend Figur 2A mit einer nicht beanspruchten zweiten Variante der zusätzlichen separaten Abdichtung;
Figur 4:
einen Ausschnitt entsprechend Figur 2a mit einer dritten Variante der zusätzlichen, separaten Abdichtung;
Figur 5:
einen Ausschnitt entsprechend Figur 2a mit einer nicht beanspruchten vierten Variante der zusätzlichen separaten Abdichtung;
Figuren 6-8:
jeweils einen Ausschnitt entsprechend Figur 2A mit jeweils unterschiedlichen geometrischen Abänderungen der Brennraumabdichtung gemäß der Erfindung, und
Figur 9:
einen Ausschnitt entsprechend Figur 2A mit einer nicht beanspruchten geometrischen Abänderung der Düsenspannmutter.
The invention will be explained in more detail below with reference to embodiments with reference to the accompanying drawings. In the drawing show:
FIG. 1:
a nozzle body clamped by a nozzle locknut as known in the art;
FIG. 2:
the arrangement after FIG. 1 with a not belonging to the invention first additional, separate seal;
FIG. 2a:
a partial section A of FIG. 2 ;
FIG. 3:
a section accordingly FIG. 2A with a non-claimed second variant of the additional separate seal;
FIG. 4:
a section accordingly FIG. 2a with a third variant of the additional, separate seal;
FIG. 5:
a section accordingly FIG. 2a with an unclaimed fourth variant of the additional separate seal;
Figures 6-8:
each corresponding to a section FIG. 2A each with different geometrical variations of the combustion chamber seal according to the invention, and
FIG. 9:
a section accordingly FIG. 2A with a non-claimed geometric modification of the nozzle retaining nut.

Figur 1 zeigt teilweise im Längsschnitt einen Ausschnitt eines Kraftstoffeinspritzventils 10 mit einer Düsenspannmutter 20, welche einen Düsenkörper 30 festspannt. Schematisch angedeutet ist bei 40 ein Brennraum, in welchen der Düsenkörper 30 teilweise hineinragt. An der Schnittstelle Düsenspannmutter 20, Düsenkörper 30 und Brennraum 40 ist ein Brennraumdichtelement 50 angeordnet. Das Brennraumdichtelement 50 umfasst den über die Düsenspannmutter 20 hinausragenden Teil des Düsenkörpers 30. Der Düsenkörper 30 weist einen Kreis bzw. kreisringförmigen Querschnitt in Längsrichtung das heißt in Einspritzrichtung auf. Ebenfalls weist das Brennraumdichtelement 50 einen hiermit korrespondierenden ringförmigen Querschnitt in Längsrichtung auf. Der Außendurchmesser des Düsenkörperquerschnitts entspricht in etwa dem Innendurchmesser der Ausnehmung des Brennraumdichtelements 50 (ringförmige Ausnehmung). Das Brennraumdichtelement 50 weißt zwei Stirnseiten oder Auflageflächen auf, eine obere Auflagefläche 60, welche der Düsenspannmutter 20 zugewandt ist, und eine untere Auflagefläche 70, welche dem Brennraum 40 zugewandt ist. FIG. 1 shows partially in longitudinal section a detail of a fuel injection valve 10 with a nozzle retaining nut 20, which clamps a nozzle body 30. Schematically indicated at 40 is a combustion chamber in which the nozzle body 30 partially protrudes. At the interface nozzle retaining nut 20, nozzle body 30 and combustion chamber 40, a combustion chamber sealing element 50 is arranged. The combustion chamber sealing element 50 comprises the part of the nozzle body 30 protruding beyond the nozzle retaining nut 20. The nozzle body 30 has a circular or annular cross-section in the longitudinal direction, that is to say in the injection direction. The combustion chamber sealing element 50 likewise has a corresponding annular cross section in the longitudinal direction. The outer diameter of the nozzle body cross section corresponds approximately to the inner diameter of the recess of the combustion chamber sealing element 50 (annular recess). The combustion chamber sealing element 50 has two end faces or bearing surfaces, an upper bearing surface 60, which faces the nozzle retaining nut 20, and a lower bearing surface 70, which faces the combustion chamber 40.

Figur 2 zeigt im Längsschnitt einen entsprechenden Ausschnitt gemäß Figur 1, wobei ein weiteres Dichtungselement 80 vorgesehen ist. Dieses Dichtungselement umgreift den Düsenkörper 30 im Bereich eines Absatzes 90 des Düsenkörpers 30 im Kontaktbereich der Düsenspannmutter 20 und des Brennraumdichtelements 50. Das Dichtungselement 80 kann dabei als separates Ringelement ausgebildet sein, das aus sehr weichen Metallen, hitzebeständigen Polymeren oder anderen kraftstoffbeständigen Materialien besteht. Der Innendurchmesser dieses ringförmigen Dichtungselements 50 entspricht in etwa dem Außendurchmesser des Düsenkörpers 30, sodass es vom brennraumseitigen Ende des Düsenkörpers auf diesen aufgebracht werden kann. Figur 2A zeigt den vergrößerten Bereich A aus Figur 2. Es ist zu erkennen, dass das Dichtungselement 80 im zusammengebauten Zustand des Kraftstoffeinspritzventils in Anlage kommt mit dem Düsenkörper 30 der Düsenspannmutter 20 und dem Brennraumdichtelement 50. FIG. 2 shows in longitudinal section a corresponding section according to FIG. 1 , wherein a further sealing element 80 is provided. This sealing element surrounds the nozzle body 30 in the region of a shoulder 90 of the nozzle body 30 in the contact area of the nozzle retaining nut 20 and the combustion chamber sealing element 50. The sealing element 80 may be formed as a separate ring element, which consists of very soft metals, heat-resistant polymers or other fuel-resistant materials. The inner diameter of this annular sealing element 50 corresponds approximately to the outer diameter of the nozzle body 30 so that it can be applied to the latter from the combustion chamber end of the nozzle body. FIG. 2A shows the enlarged area A. FIG. 2 , It can be seen that the sealing element 80 comes into abutment with the nozzle body 30 of the nozzle retaining nut 20 and the combustion chamber sealing element 50 in the assembled state of the fuel injection valve.

Figur 3 zeigt den gleichen Ausschnitt wie Figur 2a, wobei das Dichtungselement 180 hier durch Anvulkanisieren eines Dichtungsbereichs an die Düsenspannmutter 20 gebildet ist. Das Anvulkanisieren des Dichtungselements 180 erfolgt dabei vor dem Montieren des Brennraumdichtelements 50. Das Dichtungselement 180 steht somit wie aus Figur 3 zu ersehen lediglich in Kontakt mit dem Düsenkörper 30 und der Düsenspannmutter 20. Ein Kontakt im fertig montierten Zustand auch mit dem Brennraumdichtelement 50 ist dabei allerdings nicht ausgeschlossen. FIG. 3 shows the same section as FIG. 2a wherein the sealing element 180 is formed here by vulcanizing a sealing area to the nozzle retaining nut 20. The vulcanization of the sealing element 180 takes place before the mounting of the combustion chamber sealing element 50. The sealing element 180 thus stands out as FIG. 3 can be seen only in contact with the nozzle body 30 and the nozzle retaining nut 20. A contact in the assembled state even with the combustion chamber sealing element 50 is not excluded.

Figur 4 zeigt ebenfalls den Ausschnitt entsprechend dem der Figur 2A. Auch bei diesem Ausführungsbeispiel ist ein Dichtungselement 280 über das Anvulkanisieren gebildet. Im Gegensatz zu Figur 3 erfolgt das Anvulkanisieren des Dichtungselements 280 jedoch an das Brennraumdichtungselement 50, nämlich im Bereich zwischen dem Außenumfang des Düsenkörpers und den im Innenumfang des Brennraumdichtungselements 50. FIG. 4 also shows the section corresponding to the FIG. 2A , Also in this embodiment, a sealing member 280 is formed by the scorching. In contrast to FIG. 3 However, the vulcanization of the sealing element 280 is carried out to the combustion chamber sealing element 50, namely in the region between the outer circumference of the nozzle body and in the inner circumference of the combustion chamber sealing element 50.

Auch Figur 5 zeigt den der Figur 2A entsprechenden Ausschnitt des Kraftstoffeinspritzventils. Bei diesem Ausführungsbeispiel ist der Spalt, der von dem Absatz des Düsenkörpers 30, der Düsenspannmutter 20 und dem Brennraumdichtungselement 50 gebildet ist, mit einer hitzebeständigen Vergussmasse als Dichtungselement 380 gefüllt. Diese Vergussmasse ist nach der Verschraubung der Düsenspannmutter 20 mit dem Düsenkörper 30 eingebracht. Folglich grenzt das Dichtungselement 380 an den Düsenkörper 30 und die Düsenspannmutter 20 an.Also FIG. 5 shows the the FIG. 2A corresponding section of the fuel injection valve. In this embodiment, the gap formed by the shoulder of the nozzle body 30, the nozzle lock nut 20, and the combustion chamber seal member 50 is filled with a heat-resistant potting compound as the seal member 380. This potting compound is introduced after the screwing of the nozzle retaining nut 20 with the nozzle body 30. As a result, the seal member 380 abuts the nozzle body 30 and the nozzle lock nut 20.

Die Figuren 6 bis 8 zeigen Ausführungsbeispiele der Erfindung, bei denen durch eine geometrische Abänderung des Brennraumdichtelements 150, 250, 350 eine weitere zusätzliche Abdichtung gebildet ist, um gegegenüber Ablagerungen durch unverbranntes Gemisch und Abgase im Spalt zwischen Düsenspannmutter 20 und Düsenkörper 30 zu dichten. In Figur 6 ist ein ringscheibenförmiges Brennraumdichtelement 150 gezeigt, welches im Bereich seines Innendurchmessers, radial innen, eine im Längsschnitt in Achsrichtung zum Brennraum hin ausgebildete Zunge 100 aufweißt. Diese Zunge 100 ist im Querschnitt des Brennraumdichtelements 150 spitz zulaufend nach radial innen unten (in Richtung Brennraum 40) soweit ausgebildet, dass ein Dichtkontakt mit der Außenumfangsfläche des Düsenkörpers 30 hergestellt ist.The FIGS. 6 to 8 show embodiments of the invention in which by a geometric modification of the combustion chamber sealing member 150, 250, 350, a further additional seal is formed to seal against deposits by unburned mixture and exhaust gases in the gap between the nozzle lock nut 20 and nozzle body 30. In FIG. 6 an annular disk-shaped combustion chamber sealing element 150 is shown, which in the region of its inner diameter, radially inwardly, has a tongue 100 formed longitudinally in the axial direction towards the combustion chamber. This tongue 100 is in the cross-section of the combustion chamber sealing member 150 tapering radially inwardly below (toward the combustion chamber 40) formed so far that a sealing contact with the outer peripheral surface of the nozzle body 30 is made.

Figur 7 zeigt ebenfalls ein ringscheibenförmiges Brennraumdichtelement 250 mit einer Zunge 200, die in Achsrichtung des Kraftstoffeinspritzventils vom Brennraum 40 weg ausgebildet ist. Wie die Zunge 100 der Figur 6 verläuft auch die Zunge 200 im Querschnitt des Brennraumdichtelements 250 spitz zulaufend und bildet im Bereich des Absatzes 90 des Düsenkörpers 30 einen Dichtkontakt mit dem Düsenkörper 30. FIG. 7 also shows an annular disk-shaped combustion chamber sealing element 250 with a tongue 200, which is formed in the axial direction of the fuel injection valve from the combustion chamber 40 away. Like the tongue 100's FIG. 6 The tongue 200 also runs in a tapered manner in cross-section of the combustion chamber sealing element 250 and forms a sealing contact with the nozzle body 30 in the region of the shoulder 90 of the nozzle body 30.

Auch in Figur 8 ist ein ringscheibenförmiges Brennraumdichtelement 350 gezeigt. Im Bereich seines radial inneren Durchmessers verjüngt sich dieses Brennraumdichtelement 350 gleichförmig radial nach innen und verläuft im Querschnitt spitz zulaufend zum Außendurchmesser des Düsenkörpers und bildet mit diesem einen Dichtkontakt. Die Abdichtung erfolgt bei diesem Beispiel also über eine im Querschnitt rechteckförmige Zunge 300 des Brennraumdichtelements 350.Also in FIG. 8 an annular disk shaped combustion chamber sealing member 350 is shown. In the region of its radially inner diameter, this combustion chamber sealing element 350 tapers uniformly radially inwards and runs in cross section tapered to the outer diameter of the nozzle body and forms a sealing contact with this. In this example, therefore, the sealing takes place via a tongue 300, which is rectangular in cross section, of the combustion chamber sealing element 350.

Figur 9 zeigt ein Dichtungselement 400 welches durch eine radial nach innen ragende Zunge an der Düsenspannmutter 120 gebildet ist. Hierzu weist die Düsenspannmutter 120 an ihrem dem Brennraumdichtelement 50 benachbarten Bereich einen Fortsatz 400 auf, der radial einwärts soweit vorsteht, dass er in Dichtkontakt mit dem Düsenkörper 30 im Bereich des Absatzes 90 gelangt. Die Zunge 400 ist im vorliegenden Fall spitz zulaufend gezeigt, kann jedoch auch eine im Querschnitt abweichende Form davon aufweisen. FIG. 9 shows a sealing element 400 which is formed by a radially inwardly projecting tongue on the nozzle lock nut 120. For this purpose, the nozzle retaining nut 120 has at its region adjacent to the combustion chamber sealing element 50 an extension 400 which protrudes radially inward to such an extent that it comes into sealing contact with the nozzle body 30 in the region of the shoulder 90. The tongue 400 is shown tapered in the present case, but may also have a different cross-sectional shape thereof.

Die Erfindung ist nicht Beschränkt auf die vorstehend beschriebenen bevorzugten Ausführungsformen. Es sind vielmehr auch Abweichungen hiervon denkbar, welche vom Schutzbereich der nachfolgenden Ansprüche umfasst sind.The invention is not limited to the preferred embodiments described above. Rather, deviations from this are conceivable, which are encompassed by the scope of protection of the following claims.

Claims (2)

  1. Fuel injection valve for arranging on a combustion chamber (40) of an internal combustion engine comprising:
    a nozzle holder, on which a nozzle body (30) for receiving a nozzle needle is arranged, which nozzle body (30) is clamped fixedly via a nozzle clamping nut (20) and is configured for protruding into the combustion chamber (40), and at least one annular disc-shaped combustion chamber sealing element (150; 250; 350) with an upper bearing face (60) which faces the nozzle clamping nut (20) and a lower bearing face (70) which faces the combustion chamber (40), which combustion chamber sealing element (150; 250; 350) surrounds the nozzle body (30) and serves to seal the nozzle holder with respect to the combustion chamber (40), at least one additional sealing element (100; 200; 280; 300) being provided for sealing the nozzle body (30) in the region of the nozzle clamping nut (20), characterized in that the additional sealing element (100; 200; 280; 300) is formed by a part region of the combustion chamber sealing element (150; 250; 350) in the form of a geometric modification, as a result of which a sealing contact is produced with the outer circumferential face of the nozzle body (30), in order to seal with respect to deposits as a result of unburnt mixture and exhaust gases in the gap between the nozzle clamping nut (20) and the nozzle body (30).
  2. Fuel injection valve according to Claim 1, characterized in that the sealing element (80) is formed from very soft metals, heat-resistant polymers or other fuel-resistant materials.
EP09779830.0A 2008-08-05 2009-06-18 Fuel injection valve for arrangement in a combustion chamber of an internal combustion engine Active EP2321521B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008036413A DE102008036413A1 (en) 2008-08-05 2008-08-05 Fuel injection valve for arrangement on a combustion chamber of an internal combustion engine
PCT/EP2009/057590 WO2010015454A1 (en) 2008-08-05 2009-06-18 Fuel injection valve for arrangement in a combustion chamber of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2321521A1 EP2321521A1 (en) 2011-05-18
EP2321521B1 true EP2321521B1 (en) 2014-11-05

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EP09779830.0A Active EP2321521B1 (en) 2008-08-05 2009-06-18 Fuel injection valve for arrangement in a combustion chamber of an internal combustion engine

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US (1) US8528524B2 (en)
EP (1) EP2321521B1 (en)
CN (1) CN102112726B (en)
DE (1) DE102008036413A1 (en)
WO (1) WO2010015454A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102009000285A1 (en) * 2009-01-19 2010-07-22 Robert Bosch Gmbh Fuel injector as well as internal combustion engine with fuel injector
JP5270714B2 (en) * 2011-04-27 2013-08-21 トヨタ自動車株式会社 Damping insulator for fuel injection valve
US9410520B2 (en) * 2013-08-08 2016-08-09 Cummins Inc. Internal combustion engine including an injector combustion seal positioned between a fuel injector and an engine body
US10036355B2 (en) * 2013-08-08 2018-07-31 Cummins Inc. Heat transferring fuel injector combustion seal with load bearing capability
DE102014225976A1 (en) 2014-12-16 2016-06-16 Robert Bosch Gmbh Fuel injection device
US11174825B2 (en) * 2019-02-11 2021-11-16 Caterpillar Inc. Seal configuration for fuel injector
US10746145B1 (en) * 2019-05-08 2020-08-18 Delphi Technologies Ip Limited Isolator for fuel injector

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GB1262164A (en) 1969-06-07 1972-02-02 Gkn Floform Ltd Fuel injector sleeve for a diesel engine
US3695235A (en) * 1970-08-26 1972-10-03 Mcculloch Corp Heat seal for fuel injection nozzles
US5330100A (en) * 1992-01-27 1994-07-19 Igor Malinowski Ultrasonic fuel injector
DE19807819C1 (en) * 1998-02-26 1999-05-12 Mtu Friedrichshafen Gmbh Motor fuel injector
JP4067237B2 (en) * 1999-05-27 2008-03-26 ヤマハマリン株式会社 In-cylinder injection engine
DE10027662A1 (en) * 2000-06-03 2001-12-06 Bosch Gmbh Robert Sealing unit for a fuel injection valve in a cylider head bore comprises a main body with an axial bore with an enlarged section which accommodates a sealing element
DE10102192B4 (en) 2001-01-16 2012-12-13 Volkswagen Ag Device for holding injection elements in the cylinder head of an internal combustion engine
DE102004049277A1 (en) * 2004-10-09 2006-04-13 Robert Bosch Gmbh Damping element for a fuel injection valve
CN100334344C (en) 2005-01-26 2007-08-29 周书田 Multi-orifice pencil-style fuel injectors
DE102005053112A1 (en) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Fuel injection valve with fuse for a valve-combustion chamber sealing element

Also Published As

Publication number Publication date
DE102008036413A1 (en) 2010-02-18
CN102112726B (en) 2017-03-01
CN102112726A (en) 2011-06-29
WO2010015454A1 (en) 2010-02-11
US20110132329A1 (en) 2011-06-09
US8528524B2 (en) 2013-09-10
EP2321521A1 (en) 2011-05-18

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