EP1793119B1 - Fuel-injection unit for an internal combustion engine - Google Patents

Fuel-injection unit for an internal combustion engine Download PDF

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Publication number
EP1793119B1
EP1793119B1 EP06122313A EP06122313A EP1793119B1 EP 1793119 B1 EP1793119 B1 EP 1793119B1 EP 06122313 A EP06122313 A EP 06122313A EP 06122313 A EP06122313 A EP 06122313A EP 1793119 B1 EP1793119 B1 EP 1793119B1
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EP
European Patent Office
Prior art keywords
pressure
fuel line
pressure fuel
accumulator
injector
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Not-in-force
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EP06122313A
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German (de)
French (fr)
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EP1793119A1 (en
Inventor
Wolfgang Braun
Volkmar Kern
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1793119A1 publication Critical patent/EP1793119A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention relates to a high-pressure fuel line and a fuel injection system with high-pressure fuel line according to the preamble of claim 1 and of claim 5.
  • Such a high-pressure fuel line and such a fuel injection system is characterized by the JP 2000 027731 A known.
  • an injector of the fuel injection device is connected to a high-pressure accumulator.
  • a flow cross-sectional constriction is arranged in relation to the remaining flow cross-section between the injector and the high-pressure accumulator in the end region of the high-pressure fuel line facing the high-pressure accumulator.
  • a separate component is used, which has a smaller diameter in relation to the inner diameter of the high-pressure fuel line bore. This separate component must be inserted in a complex and therefore associated with high cost manufacturing process in the high-pressure fuel line and fixed in it so that it remains safe in the high-pressure fuel line.
  • EP-A-1 707 793 is also a high-pressure fuel line known in which a separate component is used to form a flow cross-sectional constriction in the high-pressure fuel line, which is provided with a flow cross-sectional constriction darestellenden bore.
  • This high-pressure fuel line is thus complicated and expensive to manufacture.
  • the high-pressure fuel line according to the invention with the features of claim 1 has the advantage that it is simple and inexpensive to manufacture, as in this no separate component for forming the flow cross-sectional constriction is required.
  • the fuel injection device according to claim 5 has the advantage that it requires a small space and is inexpensive to produce.
  • FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation
  • FIG. 2 a fuel high-pressure line of the fuel injection device in an enlarged view in a longitudinal section along line II-II in FIG. 1 ,
  • FIG. 1 a fuel injection device for an internal combustion engine of a motor vehicle is shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has at least one or more cylinders 6, of which in FIG. 1 only one is shown.
  • the fuel injection device has a feed pump 10, is conveyed by the fuel from a reservoir 12 to a high-pressure pump 14.
  • fuel is conveyed via at least one hydraulic line 15 under high pressure in a high-pressure accumulator 16.
  • injectors 20 are arranged via high-pressure fuel lines 18 to the cylinders 6 of the internal combustion engine.
  • a control valve 22 is arranged, by means of which the injector 20 can be opened to a fuel injection or can be closed to complete a fuel injection.
  • the control valves 22 of the injectors 20 are connected to an electronic control device 24 and are driven by them depending on operating parameters of the internal combustion engine.
  • the control valves 22 may each have an electromagnetic or a piezoelectric actuator.
  • the high pressure accumulator 16 is for example tubular and the high-pressure fuel lines 18 to the injectors 20 lead from the periphery of the high pressure accumulator 16.
  • the high-pressure accumulator 16 is tuned in its volume to the requirements of the fuel injection device.
  • the high-pressure fuel lines 18 are designed in a known manner, for example, as metal pipes made of steel, in particular high-strength steel, with sufficient strength and are for example by means of Screw connections connected to the high-pressure accumulator 16.
  • the high-pressure fuel lines 18 have at their ends connected to the high-pressure accumulator 16 an enlarged outer cross-section with respect to the remaining region of the high-pressure fuel line 18 connecting piece 30 which tapers approximately conically towards the high-pressure accumulator 16 and into a correspondingly shaped receptacle 32 with conical contact surface on the high pressure accumulator 16th is inserted.
  • a union nut 33 of the connecting piece 30 is clamped in the receptacle 32 and the seal at the transition between the high-pressure accumulator 16 and the high-pressure fuel line 18 ensured.
  • each high-pressure fuel line 18 which is for example a bore, and can flow through the fuel from the high-pressure accumulator 16 into the respective high-pressure fuel line 18.
  • the high-pressure fuel line 18 has a constant inner cross-section over most of its length, which is preferably circular and has a diameter d1.
  • this has a reduced inner cross-section, which is preferably also circular and has a diameter d2. Due to the reduced diameter d2, a flow cross-sectional constriction 36 is formed in the high-pressure fuel line 18.
  • the transition from the diameter d1 to the diameter d2 in the high-pressure fuel line 18 preferably runs at least approximately conically, so that in a transition region 38, the inner diameter of the high-pressure fuel line 18 gradually decreases from d1 to d2.
  • the transition region 38 has one for the respective fuel injector fixed length 1 on.
  • the diameter d2 is also set in relation to the diameter d1 suitable for the respective fuel injection device.
  • the cone angle of the transition region 38 is also suitably chosen.
  • the diameter of the opening 34 in the high-pressure accumulator 16 is greater than or equal to the diameter d2 of the flow cross-sectional constriction 36.
  • the flow cross-sectional constriction 36, the flow of fuel from the high-pressure accumulator 16 to Injector 20 is only slightly affected, while the propagation of pressure waves from the injector 20 through the high-pressure fuel line 18 into the high-pressure accumulator 16 is substantially prevented.
  • the flow cross-sectional constriction 36 and the transition region 38 in the high-pressure fuel line 18 can be produced, for example, by means of a drawing, stretching or compression deformation method of the high-pressure fuel line.
  • the high pressure accumulator 16 of the fuel injection device can also be omitted, in which case each injector 20 is connected directly to the high pressure pump 14 upper with a manifold of the high pressure pump.

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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

The line connects an injector of a fuel injection unit with a high pressure accumulator (16) or a high pressure pump. A flow cross section constriction (36) is arranged between the injector and the accumulator. The constriction is formed in an end area of the fuel high pressure line through reduction of an inner cross section of the fuel high pressure line compared to another inner cross section, where the end area faces a high pressure accumulator or high pressure pump.

Description

Die Erfindung betrifft eine Kraftstoffhochdruckleitung und ein Kraftstoffeinspritzsystem mit Kraftstoffhochdruckleitung nach dem Oberbegriff des Anspruchs 1 bzw. des Anspruchs 5.The invention relates to a high-pressure fuel line and a fuel injection system with high-pressure fuel line according to the preamble of claim 1 and of claim 5.

Eine solche Kraftstoffhochdruckleitung und ein solches Kraftstoffeinspritzsystem ist durch die JP 2000 027731 A bekannt. Durch diese Kraftstoffhochdruckleitung wird ein Injektor der Kraftstoffeinspritzeinrichtung mit einem Hochdruckspeicher verbunden. Zwischen dem Injektor und dem Hochdruckspeicher ist ein gegenüber dem übrigen Durchflussquerschnitt zwischen dem Injektor und dem Hochdruckspeicher in dem dem Hochdruckspeicher zugewandten Endbereich der Kraftstoffhochdruckleitung eine Durchflussquerschnittsverengung angeordnet. Zur Durchflussquerschnittsverengung ist in die Kraftstoffhochdruckleitung ein separates Bauteil eingesetzt, das eine im Durchmesser gegenüber dem Innendurchmesser der Kraftstoffhochdruckleitung kleinere Bohrung aufweist. Dieses separate Bauteil muss in einem aufwendigen und somit mit hohen Kosten verbundenen Fertigungsprozess in die Kraftstoffhochdruckleitung eingefügt und in dieser fixiert werden, damit es sicher in der Kraftstoffhochdruckleitung verbleibt.Such a high-pressure fuel line and such a fuel injection system is characterized by the JP 2000 027731 A known. By this high-pressure fuel line, an injector of the fuel injection device is connected to a high-pressure accumulator. Between the injector and the high-pressure accumulator, a flow cross-sectional constriction is arranged in relation to the remaining flow cross-section between the injector and the high-pressure accumulator in the end region of the high-pressure fuel line facing the high-pressure accumulator. For flow cross-sectional constriction in the high-pressure fuel line, a separate component is used, which has a smaller diameter in relation to the inner diameter of the high-pressure fuel line bore. This separate component must be inserted in a complex and therefore associated with high cost manufacturing process in the high-pressure fuel line and fixed in it so that it remains safe in the high-pressure fuel line.

Durch die nachveröffentlichte EP-A-1 707 793 ist ebenfalls eine Kräftstoffhochdruckleitung bekannt, bei der zur Bildung einer Durchflussquerschnittsverengung in die Kraftstoffhochdruckleitung ein separates Bauteil eingesetzt ist, das mit einer die Durchflussquerschnittsverengung darestellenden Bohrung versehen ist. Auch diese Kraftstoffhochdruckleitung ist somit aufwendig und teuer in der Herstellung.By the post-published EP-A-1 707 793 is also a high-pressure fuel line known in which a separate component is used to form a flow cross-sectional constriction in the high-pressure fuel line, which is provided with a flow cross-sectional constriction darestellenden bore. This high-pressure fuel line is thus complicated and expensive to manufacture.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffhochdruckleitung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass diese einfach und kostengünstig zu fertigen ist, da in dieser kein separates Bauteil zur Bildung der Durchflussquerschnittsverengung erforderlich ist.The high-pressure fuel line according to the invention with the features of claim 1 has the advantage that it is simple and inexpensive to manufacture, as in this no separate component for forming the flow cross-sectional constriction is required.

Die Kraftstoffeinspritzeinrichtung gemäß Anspruch 5 hat den Vorteil, dass diese einen geringen Bauraum erfordert und kostengünstig herstellbar ist.The fuel injection device according to claim 5 has the advantage that it requires a small space and is inexpensive to produce.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffhochdruckleitung angegeben. Die Ausbildung gemäß Anspruch 2 ermöglicht einen strömungsgünstigen Übergang von der Durchflussquerschnittsverengung zum übrigen Innenquerschnitt der Kraftstoffhochdruckleitung.In the dependent claims advantageous refinements and developments of the high-pressure fuel line according to the invention are given. The embodiment of claim 2 allows a flow-favorable transition from the flow cross-sectional constriction to the remaining inner cross section of the high-pressure fuel line.

Offenbarung der ErfindungDisclosure of the invention

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung und Figur 2 eine Kraftstoffhochdruckleitung der Kraftstoffeinspritzeinrichtung in vergrößerter Darstellung in einem Längsschnitt entlang Linie II-II in Figur 1.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. Show it FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation and FIG. 2 a fuel high-pressure line of the fuel injection device in an enlarged view in a longitudinal section along line II-II in FIG. 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine und weist wenigstens einen oder mehrere Zylinder 6 auf, von denen in Figur 1 nur einer dargestellt ist. Die Kraftstoffeinspritzeinrichtung weist eine Förderpumpe 10 auf, durch die Kraftstoff aus einem Vorratsbehälter 12 zu einer Hochdruckpumpe 14 gefördert wird. Durch die Hochdruckpumpe 14 wird Kraftstoff über wenigstens eine hydraulische Leitung 15 unter Hochdruck in einen Hochdruckspeicher 16 gefördert. Mit dem Hochdruckspeicher 16 sind über Kraftstoffhochdruckleitungen 18 an den Zylindern 6 der Brennkraftmaschine angeordnete Injektoren 20 verbunden. An jedem Injektor 20 ist jeweils ein Steuerventil 22 angeordnet, mittels dem der Injektor 20 zu einer Kraftstoffeinspritzung geöffnet werden kann bzw. zur Beendigung einer Kraftstoffeinspritzung geschlossen werden kann. Die Steuerventile 22 der Injektoren 20 sind mit einer elektronischen Steuereinrichtung 24 verbunden und werden durch diese abhängig von Betriebsparametern der Brennkraftmaschine angesteuert. Die Steuerventile 22 können jeweils einen elektromagnetischen oder einen piezoelektrischen Aktor aufweisen.In FIG. 1 a fuel injection device for an internal combustion engine of a motor vehicle is shown. The internal combustion engine is preferably a self-igniting internal combustion engine and has at least one or more cylinders 6, of which in FIG. 1 only one is shown. The fuel injection device has a feed pump 10, is conveyed by the fuel from a reservoir 12 to a high-pressure pump 14. By the high pressure pump 14 fuel is conveyed via at least one hydraulic line 15 under high pressure in a high-pressure accumulator 16. With the high-pressure accumulator 16 injectors 20 are arranged via high-pressure fuel lines 18 to the cylinders 6 of the internal combustion engine. At each injector 20, a control valve 22 is arranged, by means of which the injector 20 can be opened to a fuel injection or can be closed to complete a fuel injection. The control valves 22 of the injectors 20 are connected to an electronic control device 24 and are driven by them depending on operating parameters of the internal combustion engine. The control valves 22 may each have an electromagnetic or a piezoelectric actuator.

Der Hochdruckspeicher 16 ist beispielsweise rohrförmig ausgebildet und die Kraftstoffhochdruckleitungen 18 zu den Injektoren 20 führen vom Umfang des Hochdruckspeichers 16 ab. Der Hochdruckspeicher 16 ist in seinem Volumen auf die Erfordernisse der Kraftstoffeinspritzeinrichtung abgestimmt. Die Kraftstoffhochdruckleitungen 18 sind in bekannter Weise beispielsweise als Metallrohre aus Stahl, insbesondere höherfestem Stahl, mit ausreichender Festigkeit ausgeführt und sind beispielsweise mittels Schraubverbindungen am Hochdruckspeicher 16 angeschlossen. Die Kraftstoffhochdruckleitungen 18 weisen an ihren am Hochdruckspeicher 16 angeschlossenen Enden einen im Außenquerschnitt gegenüber dem übrigen Bereich der Kraftstoffhochdruckleitung 18 vergrößerten Anschlussstutzen 30 auf, der sich beispielsweise zum Hochdruckspeicher 16 hin etwa konisch verjüngt und der in eine entsprechend geformte Aufnahme 32 mit konischer Anlagefläche am Hochdruckspeicher 16 eingefügt ist. Durch eine Überwurfmutter 33 wird der Anschlussstutzen 30 in der Aufnahme 32 verspannt und die Abdichtung am Übergang zwischen dem Hochdruckspeicher 16 und der Kraftstoffhochdruckleitung 18 sichergestellt.The high pressure accumulator 16 is for example tubular and the high-pressure fuel lines 18 to the injectors 20 lead from the periphery of the high pressure accumulator 16. The high-pressure accumulator 16 is tuned in its volume to the requirements of the fuel injection device. The high-pressure fuel lines 18 are designed in a known manner, for example, as metal pipes made of steel, in particular high-strength steel, with sufficient strength and are for example by means of Screw connections connected to the high-pressure accumulator 16. The high-pressure fuel lines 18 have at their ends connected to the high-pressure accumulator 16 an enlarged outer cross-section with respect to the remaining region of the high-pressure fuel line 18 connecting piece 30 which tapers approximately conically towards the high-pressure accumulator 16 and into a correspondingly shaped receptacle 32 with conical contact surface on the high pressure accumulator 16th is inserted. By a union nut 33 of the connecting piece 30 is clamped in the receptacle 32 and the seal at the transition between the high-pressure accumulator 16 and the high-pressure fuel line 18 ensured.

In der Wandung des Hochdruckspeichers 16 ist für jede Kraftstoffhochdruckleitung 18 eine innerhalb der Aufnahme 32 angeordnete Öffnung 34 vorgesehen, die beispielsweise eine Bohrung ist, und durch die Kraftstoff aus dem Hochdruckspeicher 16 in die jeweilige Kraftstoffhochdruckleitung 18 durchströmen kann. Die Kraftstoffhochdruckleitung 18 weist über den größten Teil ihrer Länge einen konstanten Innenquerschnitt auf, der vorzugsweise kreisförmig ist und einen Durchmesser d1 aufweist. In dem dem Hochdruckspeicher 16 zugewandten Endbereich der Kraftstoffhochdruckleitung 18 weist diese einen verringerten Innenquerschnitt auf, der vorzugsweise ebenfalls kreisförmig ist und einen Durchmesser d2 aufweist. Durch den verringerten Durchmesser d2 ist in der Kraftstoffhochdruckleitung 18 eine Durchflussquerschnittsverengung 36 gebildet. Der Übergang vom Durchmesser d1 zum Durchmesser d2 in der Kraftstoffhochdruckleitung 18 verläuft vorzugsweise zumindest annähernd konisch, so dass sich in einem Übergangsbereich 38 der Innendurchmesser der Kraftstoffhochdruckleitung 18 von d1 zu d2 allmählich verringert. Der Übergangsbereich 38 weist eine für die jeweilige Kraftstoffeinspritzeinrichtung festgelegte Länge 1 auf. Der Durchmesser d2 ist im Verhältnis zum Durchmesser d1 ebenfalls für die jeweilige Kraftstoffeinspritzeinrichtung geeignet festgelegt. Der Kegelwinkel des Übergangsbereichs 38 ist ebenfalls geeignet gewählt.In the wall of the high-pressure accumulator 16, a disposed within the receptacle 32 opening 34 is provided for each high-pressure fuel line 18, which is for example a bore, and can flow through the fuel from the high-pressure accumulator 16 into the respective high-pressure fuel line 18. The high-pressure fuel line 18 has a constant inner cross-section over most of its length, which is preferably circular and has a diameter d1. In the high-pressure accumulator 16 facing end portion of the high-pressure fuel line 18, this has a reduced inner cross-section, which is preferably also circular and has a diameter d2. Due to the reduced diameter d2, a flow cross-sectional constriction 36 is formed in the high-pressure fuel line 18. The transition from the diameter d1 to the diameter d2 in the high-pressure fuel line 18 preferably runs at least approximately conically, so that in a transition region 38, the inner diameter of the high-pressure fuel line 18 gradually decreases from d1 to d2. The transition region 38 has one for the respective fuel injector fixed length 1 on. The diameter d2 is also set in relation to the diameter d1 suitable for the respective fuel injection device. The cone angle of the transition region 38 is also suitably chosen.

Die Durchflussquerschnittsverengung 36 reicht vorzugsweise bis zu dem dem Hochdruckspeicher 16 zugewandten Ende der Kraftstoffhochdruckleitung 18. Der Durchmesser der Öffnung 34 im Hochdruckspeicher 16 ist größer oder gleich dem Durchmesser d2 der Durchflussquerschnittsverengung 36. Durch die Durchflussquerschnittsverengung 36 wird der Durchfluss von Kraftstoff aus dem Hochdruckspeicher 16 zum Injektor 20 nur wenig beeinflusst, während die Ausbreitung von Druckwellen vom Injektor 20 durch die Kraftstoffhochdruckleitung 18 in den Hochdruckspeicher 16 im wesentlichen verhindert wird. Die Durchflussquerschnittsverengung 36 sowie der Übergangsbereich 38 in der Kraftstoffhochdruckleitung 18 kann beispielsweise mittels eines Zieh-, Streck- oder Stauchverformungsverfahrens der Kraftstoffhochdruckleitung hergestellt werden.The diameter of the opening 34 in the high-pressure accumulator 16 is greater than or equal to the diameter d2 of the flow cross-sectional constriction 36. The flow cross-sectional constriction 36, the flow of fuel from the high-pressure accumulator 16 to Injector 20 is only slightly affected, while the propagation of pressure waves from the injector 20 through the high-pressure fuel line 18 into the high-pressure accumulator 16 is substantially prevented. The flow cross-sectional constriction 36 and the transition region 38 in the high-pressure fuel line 18 can be produced, for example, by means of a drawing, stretching or compression deformation method of the high-pressure fuel line.

Der Hochdruckspeicher 16 der Kraftstoffeinspritzeinrichtung kann auch entfallen, wobei dann jeder Injektor 20 direkt mit der Hochdruckpumpe 14 ober mit einem Verteilerstück der Hochdruckpumpe verbunden ist.The high pressure accumulator 16 of the fuel injection device can also be omitted, in which case each injector 20 is connected directly to the high pressure pump 14 upper with a manifold of the high pressure pump.

Claims (5)

  1. High-pressure fuel line for a fuel injection unit of an internal combustion engine, with the high-pressure fuel line (18) serving to connect an injector (20) of the fuel injection unit to a high-pressure accumulator (16) or a high-pressure pump (14), and with a throughflow cross-sectional restriction (36) in relation to the rest of the throughflow cross section between the injector (20) and the high-pressure accumulator (16) or the high-pressure pump (14) being arranged between the injector (20) and the high-pressure accumulator (16) or the high-pressure pump (14) in that end region of the high-pressure fuel line (18) which faces towards the high-pressure accumulator (16) or the high-pressure pump (14), characterized in that the throughflow cross-sectional restriction (36) is formed by a reduction of the inner cross section (d2) of the high-pressure fuel line (18) itself in relation to the rest of the inner cross section (d1) of the high-pressure fuel line (18) without a separate component inserted into the high-pressure fuel line (18).
  2. High-pressure fuel line according to Claim 1, characterized in that the transition (38) between the inner cross-sectional reduction (d2) and the rest of the inner cross section (d1) of the high-pressure fuel line (18) is of at least approximately conical design.
  3. High-pressure fuel line according to Claim 1 or 2, characterized in that the throughflow cross-sectional restriction (36) extends up to that end of the high-pressure fuel line (18) which faces towards the high-pressure accumulator (16) or the high-pressure pump (14).
  4. High-pressure fuel line according to one of Claims 1 to 3, characterized in that said high-pressure fuel line has, at its end facing towards the high-pressure accumulator (16) or the high-pressure pump (14), a connecting pipe (30) which is enlarged in outer cross section in relation to the rest of the outer cross section of the high-pressure fuel line (18), and in that the inner cross-sectional reduction (d2) is arranged in the connecting pipe (30).
  5. Fuel injection unit for an internal combustion engine, having a high-pressure pump (14), by means of which fuel is fed under high pressure for fuel injection, having at least one injector (20) for fuel injection on the internal combustion engine, with the at least one injector (20) being connected to the high-pressure pump (14) or to a high-pressure accumulator (16), into which the high-pressure pump (14) feeds, by means of a high-pressure fuel line (18), characterized in that the high-pressure fuel line (18) is designed according to one of the preceding claims.
EP06122313A 2005-12-05 2006-10-16 Fuel-injection unit for an internal combustion engine Not-in-force EP1793119B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005057951A DE102005057951A1 (en) 2005-12-05 2005-12-05 Fuel injection device for an internal combustion engine

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EP1793119A1 EP1793119A1 (en) 2007-06-06
EP1793119B1 true EP1793119B1 (en) 2009-02-18

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AT (1) ATE423274T1 (en)
DE (2) DE102005057951A1 (en)

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EP2090772B1 (en) * 2008-02-15 2012-04-25 Continental Automotive GmbH Coupling assembly
DE102019204150A1 (en) * 2019-03-26 2020-10-01 Robert Bosch Gmbh High pressure accumulator for fuels, fuel system

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JP4020503B2 (en) * 1998-07-07 2007-12-12 臼井国際産業株式会社 Common rail injection pipe
JP3558008B2 (en) 2000-06-08 2004-08-25 トヨタ自動車株式会社 Fuel injection device
FR2845129B1 (en) * 2002-09-30 2006-04-28 Delphi Tech Inc INSERT OF FLUIDIC DIODE TYPE FOR ATTENUATING PRESSURE WAVES, AND COMMON RAIL EQUIPPED WITH SUCH INSERTS
EP1707793A1 (en) * 2005-03-10 2006-10-04 Dualon International Holding SA High pressure conduit system

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EP1793119A1 (en) 2007-06-06
DE502006002870D1 (en) 2009-04-02
DE102005057951A1 (en) 2007-06-06
ATE423274T1 (en) 2009-03-15

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