EP1881190B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP1881190B1
EP1881190B1 EP07109507A EP07109507A EP1881190B1 EP 1881190 B1 EP1881190 B1 EP 1881190B1 EP 07109507 A EP07109507 A EP 07109507A EP 07109507 A EP07109507 A EP 07109507A EP 1881190 B1 EP1881190 B1 EP 1881190B1
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EP
European Patent Office
Prior art keywords
fuel
injector
combustion chamber
line device
clamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07109507A
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German (de)
French (fr)
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EP1881190A1 (en
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1881190A1 publication Critical patent/EP1881190A1/en
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Publication of EP1881190B1 publication Critical patent/EP1881190B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004Joints; Sealings
    • F02M55/005Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • a connecting piece extending away from the combustion chamber in the extension of the longitudinal extent of the injector housing is attached to the end of the injector housing remote from the combustion chamber.
  • the French disclosure FR-A-2012144 discloses a fuel injector with attachment of the nozzle by a bracket which engages the nozzle holder, which is provided with a laterally outgoing connecting piece for the fuel supply.
  • the bracket engages with a hemispherical, a discharge channel having projection sealingly in a corresponding recess at the end of the nozzle holder, in which opens the connection to the discharge channel producing AbAvembohrung.
  • the bracket is tightened by screws and it supports itself with its projection in the hemispherical recess of the nozzle holder of the injection nozzle.
  • the US patent US 2.0.02 / 190521 A1 discloses a steel pipe extending through a pipe collar.
  • the tube collar can be fastened by means of two screws on an injector collar, which in turn can be fastened with the aid of a retaining ring to a combustion chamber remote end of an injector housing.
  • the German patent application DE 43 07 650 A1 discloses a high-pressure line connection between a pressure line and a branch line with a hold-down, which can be clamped by means of two clamping screws, which are screwed into holes in the housing of a nozzle holder with this.
  • the pressure line is accommodated with an upper part circumference in a groove of the hold-down and with a lower part circumference in a groove of the nozzle holder.
  • the pressure line has a transverse bore which opens out only to one side and which is aligned axially aligned with a branch line in the nozzle holder.
  • a connecting body In an extension bore in the mouth region of the branch line sits a connecting body, which has a centering projection for the transverse bore, which is arranged centrally within an annular shoulder of the connecting body.
  • the object of the invention is to provide a fuel injector according to the preamble of claim 1, which is simple in construction, versatile in use and easy to assemble.
  • the object is in a fuel injector with an injector, which has a longitudinal extent between a combustion chamber near end and a combustion chamber remote end with a fuel passage opening at the combustion chamber remote end by means of a clamping device is a partially transverse to the longitudinal extent of the fuel injector extending fuel line device attached to the combustion chamber remote end of the injector is provided a recess for a portion of the fuel line device, achieved in that the clamping device comprises a clamping piece with at least one passage opening for the fuel line device, wherein the clamping piece is materially connected to the injector, wherein the clamping piece a combustion chamber near the end is connected to the injector, and having an open end remote from the combustion chamber, which is closed by a screw member through which the Kraftstoff effetsei is clamped at the combustion chamber remote end of the fuel injector, wherein the fuel line device comprises an angle nozzle.
  • the fuel line device is, for example, a section of a fuel line or a connecting piece for a Fuel line. From the fuel injector, preferably from the end of the fuel injector close to the combustion chamber, for example, fuel injected in high pressure is injected into a combustion chamber of an internal combustion engine in a stroke-controlled manner.
  • the fuel injector according to the invention enables the lateral connection of fuel line devices. As a result, the height compared to conventional fuel injectors can be reduced with a longitudinally extending connecting piece.
  • the clamping piece is preferably welded to the injector housing. This makes it possible to build on existing concepts.
  • the position of the clamping nozzle, in particular in the circumferential direction, is arbitrary.
  • the recess is preferably a through hole.
  • the elbow connector allows lateral connection of a fuel line.
  • a preferred embodiment of the fuel injector is characterized in that the clamping device comprises at least one clamping element for the fuel line device, which is detachably attached to the clamping device.
  • the clamping device comprises at least one clamping element for the fuel line device, which is detachably attached to the clamping device.
  • two clamping elements for the fuel line device are releasably attached to the clamping device, preferably clipped.
  • Another preferred exemplary embodiment of the fuel injector is characterized in that an adjusting piece is arranged between the fuel line device and the screw element.
  • the adjusting piece is used by the Screw applied clamping force on the fuel line device.
  • a further preferred embodiment of the fuel injector is characterized in that the clamping nozzle has a support for the fuel line device in the region of the passage opening. As a result, a stable attachment of the fuel line device is ensured.
  • a further preferred embodiment of the fuel injector is characterized in that at the combustion chamber remote end of the fuel injector in the region of the fuel passage opening a conically widening outward recess for the Kraftstoffleiturigs noticed is provided. This ensures a stable attachment of the fuel line device, which is preferably equipped with a complementary sealing cone.
  • FIG. 1 is a part of a fuel injector 1 with an injector 2 shown in longitudinal section.
  • the in FIG. 1 visible part of the injector 2 is also referred to as a holding body 3.
  • the holding body 3 points in FIG. 1 below a cut end 4, which faces the combustion chamber (not shown) of an internal combustion engine. Therefore, the cut end 4 is also referred to as near the combustion chamber end.
  • the injector housing 2 or the holding body 3 has a combustion chamber distal end 5.
  • the injector housing 2 extends between the near the combustion chamber end 4 and the combustion chamber remote end 5 along a longitudinal axis. 6
  • At least one fuel passage 8 is provided, which serves for the supply and / or discharge of fuel.
  • the fuel channel 8 opens at its end remote from the combustion chamber into a funnel-shaped depression 10, which widens conically towards the outside.
  • the recess 10 is bordered by an annular body 12 at the combustion chamber remote end 5 of the injector housing 2.
  • Radially outside and concentric with the annular body 12 extends a weld joint 14 through which a flange 15 of a clamping device 16 is integrally connected to the injector housing 2.
  • the clamping device 16 comprises a clamping sleeve 17 with a base body 18 which is integrally connected to the flange 15.
  • the main body 18 has substantially the shape of a circular cylinder jacket whose combustion chamber near the end is cohesively connected to the flange 15.
  • the combustion chamber remote end 19 of the base body 18 is open.
  • the clamping sleeve 17 has a recess 20 through which an elbow 22 extends therethrough.
  • the elbow 22 has a pipe end 23 with an external thread, which serves to connect a fuel line.
  • the elbow 22 further includes an injector port end 24 which is disposed perpendicular to the conduit port end 23.
  • the angle between the ends 23, 24 may also be more or less than 90 degrees be.
  • the injector connection end 24 is equipped with a sealing cone, which is formed complementary to the recess 10 in the combustion chamber near the end of the injector housing 2.
  • the injector connection end 24 rests with its sealing cone under sealing effect on the recess 10.
  • the angle piece 22 is located on a receiving bearing 28 which is provided in the region of the recess 20 on the clamping piece 17.
  • On the side facing away from the combustion chamber of the elbow 22 is an adjusting piece 29, which with the help of a screw 30 to the combustion chamber, ie in FIG. 1 down, with a clamping force is applied.
  • the force exerted by the screw 30 on the adjusting piece 29 on the elbow 22 clamping force causes the sealing cone is held with the Injektoran gleichende 24 in close contact with the recess 10.
  • the holding body 3 and the clamping piece 17 are each formed of a weldable material.
  • the illustrated fuel injector has the advantage that the injector housing 2 can be tested in the same way as in the case of conventional fuel injectors with a connecting piece which extends upwards, that is to say away from the combustion chamber, after manufacture and prior to welding on the clamping piece 17. Furthermore, the manufacture of the injector housing 2 can be carried out in exactly the same way as with conventional fuel injectors.
  • the welding of the The connecting piece is used after welding for receiving the elbow 22, which is then clamped with the interposition of the adjusting piece 29 by means of the screw 30 under sealing effect at the combustion chamber remote end of the injector 2.
  • the position of the elbow 22 is freely selectable in the circumferential direction about the longitudinal axis 6 of the injector 1.
  • FIGS. 2 and 3 is a similar representation as in FIG. 1 shown in different views. To denote the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the FIG. 1 directed. In the following, the differences between the two embodiments are mainly discussed.
  • the clamping piece 17 has a recess 41 in the form of a through hole.
  • the elbow 22 extends through the through hole 41 therethrough.
  • the support 28 is formed in a semicircular recess of an annular body 45.
  • the annular body 45 is integrally connected to the injector housing 2.
  • a blind hole 44 is formed within the annular body 45.
  • the recess 10 is arranged with the passage opening.
  • FIGS. 4 and 5 the attachment of an angle stub 52 is shown on a holding body 3 according to a further embodiment.
  • the attachment of the elbow 52 is carried out by means of two angle elements 54, 55 which are connected by linearly extending welds 56, 57 cohesively with the holding body 3.
  • the angle elements 54, 55 are spaced apart. Between the angle elements 54 and 55, the angle piece 52 is arranged.
  • the angle piece 52 is held by two clamping elements 58, 59 under sealing effect in abutment against the combustion chamber distal end of the holding body 3.
  • the clamping elements 58, 59 are clipped into corresponding through holes, which are provided in the angle elements 54, 55.
  • FIG. 6 which is not the subject of the claimed invention, the combustion chamber remote end of a holding body 3 is shown in longitudinal section, which is integrally connected to a clamping sleeve 70.
  • a double pipe 73 with two lateral pipe connections 74, 75 is clamped by means of a screw element 79 and an adjusting piece 80 under sealing action to the combustion chamber remote end of the holding body 3.

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

Abstract

A fuel injector has an injector housing (2) which has a length-wise extension between one fuel space adjacent end, and a second end (5) removed from the fuel space, with a fuel entrance aperture. On the removed end (5) is mounted a fuel conduction device (22) via a clamping device and positioned partly transverse to the length-wise direction of the fuel injector.

Description

Die Erfindung betrifft einen Kraftstoffinjektor gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector according to the preamble of claim 1.

Stand der TechnikState of the art

Bei herkömmlichen Kraftstoffinjektoren ist an dem brennraumfernen Ende des Injektorgehäuses ein sich in Verlängerung der Längsausdehnung des Injektorgehäuses vom Brennraum weg erstreckender Anschlussstutzen angebracht. Die französische Offenlegungsschrift FR-A-2012144 offenbart eine Kraftstoffeinspritzdüse mit Befestigung der Düse durch einen Bügel, der am Düsenhalter.angreift, der mit einem seitlich abgehenden Anschlussstutzen für die Kraftstoffzuführung versehen ist. Der Bügel greift mit einem halbkugelförmigen, einen Abführkanal aufweisenden Vorsprung dichtend in eine entsprechende Vertiefung am Ende des Düsenhalters ein, in der die den Anschluss zum Abführkanal herstellende Abführbohrung mündet. Der Bügel wird durch Schrauben angezogen und stützt sich dabei mit seinem Vorsprung in der halbkugelförmigen Vertiefung des Düsenhalters der Einspritzdüse ab. Das US-Patent US 2.0.02/190521 A1 offenbart ein Stahlrohr, das sich durch einen Rohrkragen hindurch erstreckt. Der Rohrkragen ist mit Hilfe von zwei Schrauben an einem Injektorkragen befestigbar, der wiederum mit Hilfe eines Halterings an einem brennraumfernen Ende eines Injektorgehäuses befestigbar ist. Die deutsche Offenlegungsschrift DE 43 07 650 A1 offenbart eine Hochdruck-Leitungsverbindung zwischen einer Druckleitung und einer Abzweigleitung mit einem Niederhalter, der mittels zweier Spannschrauben, welche in Bohrungen im Gehäuse eines Düsenhalters einschraubbar sind, mit diesem verspannbar ist. Die Druckleitung ist mit einem oberen Teilumfang in einer Nut des Niederhalters und mit einem unteren Teilumfang in einer Nut des Düsenhalters aufgenommen. Die Druckleitung besitzt eine nur nach einer Seite ausmündende Querbohrung, welche mit einer Abzweigleitung im Düsenhalter axial fluchtend ausgerichtet ist. In einer Erweiterungsbohrung im Mündungsbereich der Abzweigleitung sitzt ein Verbindungskörper, der zur Querbohrung hin einen Zentriervorsprung aufweist, der mittig innerhalb einer Ringschulter des Verbindungskörpers angeordnet ist.In conventional fuel injectors, a connecting piece extending away from the combustion chamber in the extension of the longitudinal extent of the injector housing is attached to the end of the injector housing remote from the combustion chamber. The French disclosure FR-A-2012144 discloses a fuel injector with attachment of the nozzle by a bracket which engages the nozzle holder, which is provided with a laterally outgoing connecting piece for the fuel supply. The bracket engages with a hemispherical, a discharge channel having projection sealingly in a corresponding recess at the end of the nozzle holder, in which opens the connection to the discharge channel producing Abführbohrung. The bracket is tightened by screws and it supports itself with its projection in the hemispherical recess of the nozzle holder of the injection nozzle. The US patent US 2.0.02 / 190521 A1 discloses a steel pipe extending through a pipe collar. The tube collar can be fastened by means of two screws on an injector collar, which in turn can be fastened with the aid of a retaining ring to a combustion chamber remote end of an injector housing. The German patent application DE 43 07 650 A1 discloses a high-pressure line connection between a pressure line and a branch line with a hold-down, which can be clamped by means of two clamping screws, which are screwed into holes in the housing of a nozzle holder with this. The pressure line is accommodated with an upper part circumference in a groove of the hold-down and with a lower part circumference in a groove of the nozzle holder. The pressure line has a transverse bore which opens out only to one side and which is aligned axially aligned with a branch line in the nozzle holder. In an extension bore in the mouth region of the branch line sits a connecting body, which has a centering projection for the transverse bore, which is arranged centrally within an annular shoulder of the connecting body.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es, einen Kraftstoffinjektor gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, der einfach aufgebaut, vielseitig einsetzbar und einfach zu montieren ist.The object of the invention is to provide a fuel injector according to the preamble of claim 1, which is simple in construction, versatile in use and easy to assemble.

Die Aufgabe ist bei einem Kraftstoffinjektor mit einem Injektorgehäuse, das zwischen einem brennraumnahen Ende und einem brennraumfernen Ende mit einer Kraftstoffdurchtrittsöffnung eine Längsausdehnung aufweist, wobei an dem brennraumfernen Ende mit Hilfe einer Klemmeinrichtung eine sich teilweise quer zur Längsausdehnung des Kraftstoffinjektors erstreckende Kraftstoffleitungseinrichtung angebracht ist, wobei an dem brennraumfernen Ende des Injektorgehäuses eine Ausnehmung für einen Teil der Kraftstoffleitungseinrichtung vorgesehen ist, dadurch gelöst, dass die Klemmeinrichtung einen Klemmstutzen mit mindestens einer Durchführöffnung für die Kraftstoffleitungseinrichtung aufweist, wobei der Klemmstutzen stoffschlüssig mit dem Injektorgehäuse verbunden ist, wobei der Klemmstutzen ein brennraumnahes Ende, das mit dem Injektorgehäuse verbunden ist, und ein offenes brennraumfernes Ende aufweist, das mit einem Schraubelement verschlossen ist, durch das die Kräftstoffleitungseinrichtung an dem brennraumfernen Ende des Kraftstoffinjektors festgeklemmt ist, wobei die Kraftstoffleitungseinrichtung einen Winkelstutzen umfasst.The object is in a fuel injector with an injector, which has a longitudinal extent between a combustion chamber near end and a combustion chamber remote end with a fuel passage opening at the combustion chamber remote end by means of a clamping device is a partially transverse to the longitudinal extent of the fuel injector extending fuel line device attached to the combustion chamber remote end of the injector is provided a recess for a portion of the fuel line device, achieved in that the clamping device comprises a clamping piece with at least one passage opening for the fuel line device, wherein the clamping piece is materially connected to the injector, wherein the clamping piece a combustion chamber near the end is connected to the injector, and having an open end remote from the combustion chamber, which is closed by a screw member through which the Kraftstoffleitungsei is clamped at the combustion chamber remote end of the fuel injector, wherein the fuel line device comprises an angle nozzle.

Bei der Kraftstoffleitungseinrichtung handelt es sich zum Beispiel um einen Abschnitt einer Kraftstoffleitung oder eines Anschlussstutzens für eine Kraftstoffleitung. Aus dem Kraftstoffinjektor, vorzugsweise aus dem brennraumnahen Ende des Kraftstoffinjektors, wird zum Beispiel hubgesteuert mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine eingespritzt. Der erfindungsgemäße Kraftstoffinjektor ermöglicht den seitlichen Anschluss von Kraftstoffleitungseinrichtungen. Dadurch kann die Bauhöhe im Vergleich zu herkömmlichen Kraftstoffinjektoren mit einem sich in Längsrichtung fortsetzenden Anschlussstutzens reduziert werden. Der Klemmstutzen ist vorzugsweise mit dem Injektorgehäuse verschweißt. Das ermöglicht den Aufbau auf bestehende Konzepte. Die Lage des Klemmstutzens, insbesondere in Umfangsrichtung, ist frei wählbar. Bei der Ausnehmung handelt es sich vorzugsweise um ein Durchgangsloch. Der Winkelstutzen ermöglicht den seitlichen Anschluss einer Kraftstoffleitung.The fuel line device is, for example, a section of a fuel line or a connecting piece for a Fuel line. From the fuel injector, preferably from the end of the fuel injector close to the combustion chamber, for example, fuel injected in high pressure is injected into a combustion chamber of an internal combustion engine in a stroke-controlled manner. The fuel injector according to the invention enables the lateral connection of fuel line devices. As a result, the height compared to conventional fuel injectors can be reduced with a longitudinally extending connecting piece. The clamping piece is preferably welded to the injector housing. This makes it possible to build on existing concepts. The position of the clamping nozzle, in particular in the circumferential direction, is arbitrary. The recess is preferably a through hole. The elbow connector allows lateral connection of a fuel line.

Ein bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass die Klemmeinrichtung mindestens ein Klemmelement für die Kraftstoffleitungseinrichtung umfasst, das lösbar an der Klemmeinrichtung angebracht ist. Vorzugsweise sind an der Klemmeinrichtung zwei Klemmelemente für die Kraftstoffleitungseinrichtung lösbar angebracht, vorzugsweise eingeklipst.A preferred embodiment of the fuel injector is characterized in that the clamping device comprises at least one clamping element for the fuel line device, which is detachably attached to the clamping device. Preferably, two clamping elements for the fuel line device are releasably attached to the clamping device, preferably clipped.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass zwischen der Kraftstoffleitungseinrichtung und dem Schraubelement ein Einstellstück angeordnet ist. Das Einstellstück dient dazu, die durch das Schraubelement bewirkte Klemmkraft auf die Kraftstoffleitungseinrichtung aufzubringen.Another preferred exemplary embodiment of the fuel injector is characterized in that an adjusting piece is arranged between the fuel line device and the screw element. The adjusting piece is used by the Screw applied clamping force on the fuel line device.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass der Klemmstutzen im Bereich der Durchführöffnung ein Auflager für die Kraftstoffleitungseinrichtung aufweist. Dadurch wird eine stabile Befestigung der Kraftstoffleitungseinrichtung gewährleistet.A further preferred embodiment of the fuel injector is characterized in that the clamping nozzle has a support for the fuel line device in the region of the passage opening. As a result, a stable attachment of the fuel line device is ensured.

Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass an dem brennraumfernen Ende des Kraftstöffinjektors im Bereich der Kraftstoffdurchtrittsöffnung eine sich nach außen konisch erweiternde Vertiefung für die Kraftstoffleiturigseinrichtung vorgesehen ist. Dadurch wird eine stabile Befestigung der Kraftstoffleitungseinrichtung gewährleistet, die vorzugsweise mit einem komplementär ausgebildeten Dichtkegel ausgestattet ist.A further preferred embodiment of the fuel injector is characterized in that at the combustion chamber remote end of the fuel injector in the region of the fuel passage opening a conically widening outward recess for the Kraftstoffleiturigseinrichtung is provided. This ensures a stable attachment of the fuel line device, which is preferably equipped with a complementary sealing cone.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele im Einzelnen beschrieben sind.Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Es zeigen:

Figur 1
eine vereinfachte Darstellung des brennraumfernen Endes eines Kraftstoffinjektors gemäß einem ersten Ausführungsbeispiel im Schnitt;
Figur 2
eine ähnliche Darstellung wie die in Figur 1 gemäß einem weiteren Ausführungsbeispiel;
Figur 3
eine Teilschnittansicht zu Figur 2;
Figur 4
eine vereinfachte Darstellung eines Kraftstoffinjektors gemäß einem weiteren Ausführungsbeispiel in der Draufsicht;
Figur 5
eine Schnittansicht zu Figur 4 und
Figur 6
eine ähnliche Darstellung wie in Figur 1 mit einem Doppelstutzen, der jedoch nicht Gegenstand der beanspruchten Erfindung ist.
Show it:
FIG. 1
a simplified representation of the combustion chamber remote end of a fuel injector according to a first embodiment in section;
FIG. 2
a representation similar to that in Figure 1 according to a further embodiment;
FIG. 3
a partial sectional view too FIG. 2 ;
FIG. 4
a simplified representation of a fuel injector according to another embodiment in plan view;
FIG. 5
a sectional view too FIG. 4 and
FIG. 6
a similar representation as in FIG. 1 with a double nozzle, but which is not the subject of the claimed invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 ist ein Teil eines Kraftstoffinjektors 1 mit einem Injektorgehäuse 2 im Längsschnitt dargestellt. Der in Figur 1 sichtbare Teil des Injektorgehäuses 2 wird auch als Haltekörper 3 bezeichnet. Der Haltekörper 3 weist in Figur 1 unten ein abgeschnittenes Ende 4 auf, das dem (nicht dargestellten) Brennraum einer Brennkraftmaschine zugewandt ist. Deshalb wird das abgeschnittene Ende 4 auch als brennraumnahes Ende bezeichnet. In Figur 1 oben weist das Injektorgehäuse 2 beziehungsweise der Haltekörper 3 ein brennraumfernes Ende 5 auf. Das Injektorgehäuse 2 erstreckt sich zwischen dem brennraumnahen Ende 4 und dem brennraumfernen Ende 5 entlang einer Längsachse 6.In FIG. 1 is a part of a fuel injector 1 with an injector 2 shown in longitudinal section. The in FIG. 1 visible part of the injector 2 is also referred to as a holding body 3. The holding body 3 points in FIG. 1 below a cut end 4, which faces the combustion chamber (not shown) of an internal combustion engine. Therefore, the cut end 4 is also referred to as near the combustion chamber end. In FIG. 1 At the top, the injector housing 2 or the holding body 3 has a combustion chamber distal end 5. The injector housing 2 extends between the near the combustion chamber end 4 and the combustion chamber remote end 5 along a longitudinal axis. 6

In dem Inj ektorgehäuse 2 ist mindestens ein Kraftstoffkanal 8 vorgesehen, welcher der Zufuhr und/oder Abfuhr von Kraftstoff dient. Der Kraftstoffkanal 8 mündet an seinem brennraumfernen Ende in eine trichterförmige Vertiefung 10, die sich nach außen hin konisch erweitert. Die Vertiefung 10 ist durch einen Ringkörper 12 am brennraumfernen Ende 5 des Injektorgehäuses 2 eingefasst. Radial außerhalb und konzentrisch zu dem Ringkörper 12 erstreckt sich eine Schweißverbindungsnaht 14, durch die ein Flansch 15 einer Klemmeinrichtung 16 stoffschlüssig mit dem Injektorgehäuse 2 verbunden ist.In the Inj ector housing 2, at least one fuel passage 8 is provided, which serves for the supply and / or discharge of fuel. The fuel channel 8 opens at its end remote from the combustion chamber into a funnel-shaped depression 10, which widens conically towards the outside. The recess 10 is bordered by an annular body 12 at the combustion chamber remote end 5 of the injector housing 2. Radially outside and concentric with the annular body 12 extends a weld joint 14 through which a flange 15 of a clamping device 16 is integrally connected to the injector housing 2.

Die Klemmeinrichtung 16 umfasst einen Klemmstutzen 17 mit einem Grundkörper 18, der einstückig mit dem Flansch 15 verbunden ist. Der Grundkörper 18 hat im Wesentlichen die Gestalt eines Kreiszylindermantels, dessen brennraumnahes Ende stoffschlüssig mit dem Flansch 15 verbunden ist. Das brennraumferne Ende 19 des Grundkörpers 18 ist offen ausgebildet. Der Klemmstutzen 17 weist eine Ausnehmung 20 auf, durch die sich ein Winkelstutzen 22 hindurch erstreckt.The clamping device 16 comprises a clamping sleeve 17 with a base body 18 which is integrally connected to the flange 15. The main body 18 has substantially the shape of a circular cylinder jacket whose combustion chamber near the end is cohesively connected to the flange 15. The combustion chamber remote end 19 of the base body 18 is open. The clamping sleeve 17 has a recess 20 through which an elbow 22 extends therethrough.

Der Winkelstutzen 22 weist ein Leitungsanschlussende 23 mit einem Außengewinde auf, das zum Anschließen einer Kraftstoffleitung dient. Der Winkelstutzen 22 weist des Weiteren ein Injektoranschlussende 24 auf, das senkrecht zu dem Leitungsanschlussende 23 angeordnet ist. Der Winkel zwischen den Enden 23, 24 kann aber auch mehr oder weniger als 90 Grad betragen. Das Injektoranschlussende 24 ist mit einem Dichtkegel ausgestattet, der komplementär zu der Vertiefung 10 in dem brennraumnahen Ende des Injektorgehäuses 2 ausgebildet ist.The elbow 22 has a pipe end 23 with an external thread, which serves to connect a fuel line. The elbow 22 further includes an injector port end 24 which is disposed perpendicular to the conduit port end 23. The angle between the ends 23, 24 may also be more or less than 90 degrees be. The injector connection end 24 is equipped with a sealing cone, which is formed complementary to the recess 10 in the combustion chamber near the end of the injector housing 2.

Das Injektoranschlussende 24 liegt mit seinem Dichtkegel unter Dichtwirkung an der Vertiefung 10 an. Zusätzlich liegt der Winkelstutzen 22 auf einem Aufnahmelager 28 auf, das im Bereich der Ausnehmung 20 an dem Klemmstutzen 17 vorgesehen ist. An der dem Brennraum abgewandten Seite des Winkelstutzens 22 liegt ein Einstellstück 29 an, das mit Hilfe eines Schraubelements 30 zum Brennraum hin, also in Figur 1 nach unten, mit einer Klemmkraft beaufschlagt ist. Die von dem Schraubelement 30 über das Einstellstück 29 auf den Winkelstutzen 22 aufgebrachte Klemmkraft bewirkt, dass der Dichtkegel mit dem Injektoranschlussende 24 in dichter Anlage in der Vertiefung 10 gehalten wird. Durch das Aufnahmelager 28 in Kombination mit dem Einstellstück 29 wird eine stabile Befestigung des Winkelstutzens 22 gewährleistet.The injector connection end 24 rests with its sealing cone under sealing effect on the recess 10. In addition, the angle piece 22 is located on a receiving bearing 28 which is provided in the region of the recess 20 on the clamping piece 17. On the side facing away from the combustion chamber of the elbow 22 is an adjusting piece 29, which with the help of a screw 30 to the combustion chamber, ie in FIG. 1 down, with a clamping force is applied. The force exerted by the screw 30 on the adjusting piece 29 on the elbow 22 clamping force causes the sealing cone is held with the Injektoranschlussende 24 in close contact with the recess 10. By the receiving bearing 28 in combination with the adjusting piece 29 a stable attachment of the angle piece 22 is ensured.

Der Haltekörper 3 und der Klemmstutzen 17 sind jeweils aus einem schweißfähigen Material gebildet. Der dargestellte Kraftstoffinjektor hat den Vorteil, dass das Injektorgehäuse 2 nach der Fertigung und vor dem Anschweißen des Klemmstutzens 17 genauso geprüft werden kann wie bei herkömmlichen Kraftstoffinjektoren mit einem Anschlussstutzen, der sich nach oben, das heißt vom Brennraum weg, erstreckt. Des Weiteren kann die Fertigung des Injektorgehäuses 2 genauso erfolgen wie bei herkömmlichen Kraftstoffinjektoren. Das Anschweißen des Klemmstutzens 17 erfolgt vorzugsweise erst nach der Fertigung und Prüfung des Injektorgehäuses 2. Der Klemmstutzen dient nach dem Anschweißen zur Aufnahme des Winkelstutzens 22, der dann unter Zwischenschaltung des Einstellstücks 29 mit Hilfe des Schraubelements 30 unter Dichtwirkung an dem brennraumfernen Ende des Injektorgehäuses 2 festgeklemmt wird. Die Lage des Winkelstutzens 22 ist in Umfangsrichtung um die Längsachse 6 des Injektors 1 frei wählbar.The holding body 3 and the clamping piece 17 are each formed of a weldable material. The illustrated fuel injector has the advantage that the injector housing 2 can be tested in the same way as in the case of conventional fuel injectors with a connecting piece which extends upwards, that is to say away from the combustion chamber, after manufacture and prior to welding on the clamping piece 17. Furthermore, the manufacture of the injector housing 2 can be carried out in exactly the same way as with conventional fuel injectors. The welding of the The connecting piece is used after welding for receiving the elbow 22, which is then clamped with the interposition of the adjusting piece 29 by means of the screw 30 under sealing effect at the combustion chamber remote end of the injector 2. The position of the elbow 22 is freely selectable in the circumferential direction about the longitudinal axis 6 of the injector 1.

In den Figuren 2 und 3 ist eine ähnliche Darstellung wie in Figur 1 in verschiedenen Ansichten gezeigt. Zur Bezeichnung gleicher Teile werden die gleichen Bezugszeichen verwendet. Um Wiederholungen zu vermeiden, wird auf die vorangegangene Beschreibung der Figur 1 verwiesen. Im Folgenden wird hauptsächlich auf die Unterschiede zwischen den beiden Ausführungsbeispielen eingegangen.In the FIGS. 2 and 3 is a similar representation as in FIG. 1 shown in different views. To denote the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the FIG. 1 directed. In the following, the differences between the two embodiments are mainly discussed.

Bei dem in den Figuren 2 und 3 dargestellten Ausführungsbeispiel weist der Klemmstutzen 17 eine Ausnehmung 41 in Form eines Durchgangslochs auf. Der Winkelstutzen 22 erstreckt sich durch das Durchgangsloch 41 hindurch. In Figur 3 sieht man, dass das Auflager 28 in einer halbkreisförmigen Vertiefung eines Ringkörpers 45 ausgebildet ist. Der Ringkörper 45 ist einstückig mit dem Injektorgehäuse 2 verbunden. Innerhalb des Ringkörpers 45 ist ein Sackloch 44 ausgebildet. Im Zentrum des Sacklochs 44 ist die Vertiefung 10 mit der Durchtrittsöffnung angeordnet.In the in the FIGS. 2 and 3 illustrated embodiment, the clamping piece 17 has a recess 41 in the form of a through hole. The elbow 22 extends through the through hole 41 therethrough. In FIG. 3 it can be seen that the support 28 is formed in a semicircular recess of an annular body 45. The annular body 45 is integrally connected to the injector housing 2. Within the annular body 45, a blind hole 44 is formed. In the center of the blind hole 44, the recess 10 is arranged with the passage opening.

In den Figuren 4 und 5 ist die Befestigung eines Winkelstutzens 52 an einem Haltekörper 3 gemäß einem weiteren Ausführungsbeispiel dargestellt. Die Befestigung des Winkelstutzens 52 erfolgt mit Hilfe von zwei Winkelelementen 54, 55, die durch linear verlaufende Schweißnähte 56, 57 stoffschlüssig mit dem Haltekörper 3 verbunden sind. Die Winkelelemente 54, 55 sind voneinander beabstandet. Zwischen den Winkelelementen 54 und 55 ist der Winkelstutzen 52 angeordnet. Der Winkelstutzen 52 wird durch zwei Klemmelemente 58, 59 unter Dichtwirkung in Anlage an dem brennraumfernen Ende des Haltekörpers 3 gehalten. Die Klemmelemente 58, 59 sind in entsprechende Durchgangslöcher eingeklipst, die in den Winkelelementen 54, 55 vorgesehen sind.In the FIGS. 4 and 5 the attachment of an angle stub 52 is shown on a holding body 3 according to a further embodiment. The attachment of the elbow 52 is carried out by means of two angle elements 54, 55 which are connected by linearly extending welds 56, 57 cohesively with the holding body 3. The angle elements 54, 55 are spaced apart. Between the angle elements 54 and 55, the angle piece 52 is arranged. The angle piece 52 is held by two clamping elements 58, 59 under sealing effect in abutment against the combustion chamber distal end of the holding body 3. The clamping elements 58, 59 are clipped into corresponding through holes, which are provided in the angle elements 54, 55.

In Figur 6, die nicht Gegenstand der beanspruchten Erfindung ist, ist das brennraumferne Ende eines Halteskörpers 3 im Längsschnitt dargestellt, der einstückig mit einem Klemmstutzen 70 verbunden ist. In dem Klemmstutzen 70 ist ein Doppelstutzen 73 mit zwei seitlichen Leitungsanschlüssen 74, 75 mit Hilfe eines Schraubelements 79 und eines Einstellstücks 80 unter Dichtwirkung an das brennraumferne Ende des Haltekörpers 3 festgeklemmt.In FIG. 6 , which is not the subject of the claimed invention, the combustion chamber remote end of a holding body 3 is shown in longitudinal section, which is integrally connected to a clamping sleeve 70. In the clamping piece 70, a double pipe 73 with two lateral pipe connections 74, 75 is clamped by means of a screw element 79 and an adjusting piece 80 under sealing action to the combustion chamber remote end of the holding body 3.

Claims (5)

  1. Fuel injector, having a fuel line device (22;52) connected thereto, with the fuel injector having an injector housing (2) which has a longitudinal extent between an end which is close to a combustion chamber and an end (5) which is remote from the combustion chamber and which has a fuel passage opening, with a fuel line device (22;52) which extends partially transversely with respect to the longitudinal extent of the fuel injector being attached by means of a clamping device (16) to the end (5) which is remote from the combustion chamber, with a recess for a part of the fuel line device (22) being provided on that end (5) of the injector housing (2) which is remote from the combustion chamber, characterized in that the clamping device (16) has a clamping connector (17) with at least one leadthrough opening (20; 41) for the fuel line device (22), with the clamping connector (17) being cohesively connected to the injector housing (2), with the clamping connector (17) having an end (15) which is close to the combustion chamber and which is connected to the injector housing (2) and having an open end (19) which is remote from the combustion chamber and which is closed off by means of a screw element (30) which serves to fixedly clamp the fuel line device (22) to that end (5) of the fuel injector which is remote from the combustion chamber, with the fuel line device comprising an angled connector (22;52).
  2. Fuel injector, having a fuel line device (22;52) connected thereto, according to Claim 1, characterized in that the clamping device (16) comprises at least one clamping element (58,59) for the fuel line device (52), which clamping element (58,59) is releasably attached to the clamping device (16).
  3. Fuel injector, having a fuel line device (22;52) connected thereto, according to one of the preceding claims, characterized in that a setting piece (29) is arranged between the fuel line device (22) and the screw element (30).
  4. Fuel injector, having a fuel line device (22;52) connected thereto, according to one of the preceding claims, characterized in that the clamping connector (17) has, in the region of the leadthrough opening, a support (28) for the fuel line device (22).
  5. Fuel injector, having a fuel line device (22;52) connected thereto, according to one of the preceding claims, characterized in that a depression (10), which widens conically in the outward direction, for the fuel line device (22) is provided in the region of the fuel passage opening on that end (5) of the fuel injector which is remote from the combustion chamber.
EP07109507A 2006-07-21 2007-06-04 Fuel injector Not-in-force EP1881190B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006033927A DE102006033927A1 (en) 2006-07-21 2006-07-21 fuel injector

Publications (2)

Publication Number Publication Date
EP1881190A1 EP1881190A1 (en) 2008-01-23
EP1881190B1 true EP1881190B1 (en) 2009-11-18

Family

ID=38786996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07109507A Not-in-force EP1881190B1 (en) 2006-07-21 2007-06-04 Fuel injector

Country Status (3)

Country Link
EP (1) EP1881190B1 (en)
AT (1) ATE449254T1 (en)
DE (2) DE102006033927A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT293792B (en) 1968-07-02 1971-10-25 Tatra Np Arrangement for discharging fuel leakage from the nozzle of an injection valve in heavy oil engines
DE4307650C2 (en) 1993-03-11 1996-02-29 Hatz Motoren High pressure line connection
US6637776B2 (en) 2001-06-13 2003-10-28 Cummins Inc. Fluid manifold connector and fluid manifold assembly
DE102006014767A1 (en) * 2006-03-30 2007-10-04 Robert Bosch Gmbh Fuel injection device for multi-cylinder internal-combustion engine, has hydraulic line whose length between high-pressure pump and injector is larger than distance between pump and injector, and distance between two adjacent injectors
DE102006014771A1 (en) * 2006-03-30 2007-10-11 Robert Bosch Gmbh Fuel injection device for an internal combustion engine

Also Published As

Publication number Publication date
DE502007002012D1 (en) 2009-12-31
DE102006033927A1 (en) 2008-01-24
EP1881190A1 (en) 2008-01-23
ATE449254T1 (en) 2009-12-15

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