WO2004025113A1 - Device for fuel injection for an internal combustion engine - Google Patents

Device for fuel injection for an internal combustion engine Download PDF

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Publication number
WO2004025113A1
WO2004025113A1 PCT/EP2003/008869 EP0308869W WO2004025113A1 WO 2004025113 A1 WO2004025113 A1 WO 2004025113A1 EP 0308869 W EP0308869 W EP 0308869W WO 2004025113 A1 WO2004025113 A1 WO 2004025113A1
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WO
WIPO (PCT)
Prior art keywords
fuel
internal combustion
combustion engine
fuel injection
injector
Prior art date
Application number
PCT/EP2003/008869
Other languages
German (de)
French (fr)
Inventor
Adolf Kremer
Wilhelm Mair
Original Assignee
Daimlerchrysler Ag
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Filing date
Publication date
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2004025113A1 publication Critical patent/WO2004025113A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Fuel injection device for an internal combustion engine
  • the invention relates to a fuel injection device for an internal combustion engine according to the other features specified in the preamble of claim 1.
  • Such a fuel injection device is known from DE 34 28 597 AI.
  • a U-shaped spring clip is used to hold the fuel injector on the connection piece of the fuel distributor, by means of which the fuel injector is essentially rigidly coupled to the connection piece.
  • the invention has for its object to develop the known fuel injection device such that at attached to the internal combustion engine, the individual fuel injectors can be held on the internal combustion engine with a predetermined preload force that is as equal as possible, regardless of manufacturing tolerances.
  • the object is achieved in that the at least one fuel injector held axially displaceably on the connecting piece is held in contact with a component of the internal combustion engine only via the form spring as a hold-down device.
  • the solution according to the invention advantageously ensures that the fuel injector can be braced against a component of the internal combustion engine independently of the fastening of the fuel distributor.
  • the form spring as a pressing means for the fuel injector, production-related differences in length between the injector and, for example, the cylinder head can be compensated, so that the fuel injector and all other injectors are clamped against a component, such as the cylinder head of the internal combustion engine, essentially with the same pretensioning force.
  • the shaped spring is fork-shaped with two spring tongues, the spring base, from which the spring tongues extend, being fastened to the fuel rail.
  • the spring tongues are oriented on a housing section of the fuel injector which is delimited in the axial direction by a radial flange surface. This housing section for orienting the spring tongues is adjacent to the section of the fuel injector on the inlet side.
  • the injector bracket is secured to the fuel rail by the form spring.
  • the housing section is provided with two flat surfaces lying opposite one another. The fact that the spring tongues lie close to these flat surfaces prevents the fuel injector from twisting.
  • the drawing shows a perspective view of a section of a fuel injection device with a fuel rail and a single fuel injector coupled to the fuel rail. Additional fuel injectors are connected to the fuel rail in the same way as shown.
  • the fuel injection device 1 generally designates a fuel injection device for the direct injection of fuel into a combustion chamber of an Otto engine.
  • the fuel injection device 1 comprises a fuel distributor 2, which is designed as a distributor pipe and to which the fuel is fed from the fuel reservoir via a fuel pump under a certain pressure.
  • the fuel rail 2 is formed with a plurality of laterally radially projecting connecting pieces 3 for connecting fuel injectors 4.
  • the number of connection pieces 3 depends on the number of cylinders of the internal combustion engine.
  • each connecting piece 3 is formed at its free end with a flange 5, by means of which the fuel distributor 2 is fastened to a component 6 of an Otto engine, not shown, for example by screws.
  • Component 6 can be the cylinder head cover, the cylinder head housing or, for example, the intake act air duct.
  • the connecting piece 3 has a receiving bore 7, into which the fuel injector 4 with an injector section 8 on the inlet side is inserted.
  • the inlet-side injector section 8 is provided with grooves for receiving sealing and support rings 9, via which a liquid-tight connection between the fuel distributor 2 and the fuel injector 4 is achieved.
  • the fuel injector 4 is inserted axially displaceably within the receiving bore 7, the connection of the fuel injector 4 to the fuel distributor 2 being ensured as a type of captive device by means of a shaped spring 10.
  • the shaped spring 10 consists of a fastening part 11, from which two spring tongues 12 and 13 lead away from one another.
  • the fastening part 11 is fastened to the flange 5 by screws or clamps.
  • Both spring tongues 12 and 13 are bulged in a direction facing away from the fuel distributor 2 and encompass an upper housing part 14 which adjoins the injector section 8 and is delimited in the axial direction by a contact collar 15 and 16, respectively.
  • Both system collars 15 and 16, together with the spring tongues 12 and 13, secure the fuel injector 4 against sliding out of the receiving bore 7.
  • the upper housing part 14 is provided with two flat surfaces 17 (key surfaces) lying opposite one another, by means of which the fuel injector 4 is rotated relative to the fuel distributor 2 is prevented by the spring tongues 12, 13.
  • the fuel fed from the power distributor is injected directly into the combustion chamber of the internal combustion engine via the fuel injector 4.
  • the fuel injector 4 with its injection nozzle 18 is in contact with the combustion chamber (not shown in more detail) of the Otto engine.
  • the fuel injector 4 is pressed by the form spring 10 against a wall part delimiting the combustion chamber, for example the cylinder base 19, and sealed within the opening of the cylinder head base by a Teflon ring.
  • the shaped spring 10 is designed such that the pretensioning force generated by the spring tongues 12, 13 and acting on the fuel injector 4 is always greater than the gas force from the combustion chamber acting in the opposite direction on the injection nozzle 18.
  • the fuel distributor 2 Since the fuel distributor 2 is attached to the cylinder head cover or another component, manufacturing-related tolerances can occur between the cylinder head base as a contact surface 19 for the fuel injector 4 on the one hand and the attachment location of the fuel distributor 2. At the same time, the different thermal expansions between the steel fuel injector 4 and the cylinder head with the cylinder head cover made of an aluminum alloy are compensated. Because the fuel injector 4 is displaceably arranged within the receiving bore 7, these tolerances can be compensated for. At the same time, this ensures that the biasing force exerted by the form spring 10 as a hold-down device on the fuel injector 4 is essentially the same for all fuel injectors.

Abstract

The invention relates to a device for fuel injection (1) for an internal combustion engine, mainly for an internal combustion engine provided with spark ignition and a direct fuel injection into a combustion chamber. The inventive fuel injection device (1) comprised a fuel-dispensing pump (2) provided with laterally projected pipe fittings in which fuel injectors (4) are inserted in such a way that they are displaceable. The fuel injector (4) is prestressed against the lower part of a cylinder head by means of a profiled spring which is fixed to the fuel-dispensing pump in order to obtain the gas tight mounting of the fuel injector (4) on the cylinder head. The profiled spring (10) is used as a retain system. Said invention makes it possible to balance manufacturing tolerances between the fuel-dispensing pump and the cylinder head and to obtain identical prestressed forces for all fuel injectors.

Description

Kraftstoffeinspritzvorrichtung, für eine Brennkraftmaschine Fuel injection device, for an internal combustion engine
Die Erfindung bezieht sich auf eine Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine gemäß den weiteren im 0- berbegriff des Patentanspruches 1 angegebenen Merkmalen.The invention relates to a fuel injection device for an internal combustion engine according to the other features specified in the preamble of claim 1.
Eine derartige Kraftstoffeinspitzvorrichtung ist aus der DE 34 28 597 AI bekannt. Zur Halterung des Kraftstoffinjektors an dem Anschlußstutzen des Kraftstoffverteilers dient eine U- förmig gebogene Federklammer, durch welche der Kraftstoffin- jektor im wesentlichen starr mit dem Anschlußstutzen gekoppelt ist.Such a fuel injection device is known from DE 34 28 597 AI. A U-shaped spring clip is used to hold the fuel injector on the connection piece of the fuel distributor, by means of which the fuel injector is essentially rigidly coupled to the connection piece.
Von Nachteil ist, dass nach der Montage des Kraftstoffverteilers an der Brennkraftmaschine durch Fertigungstoleranzen bedingte unterschiedliche Abstände zwischen den Anschlußstutzen des Kraftstoffverteilers und den einzelnen Auflageflächen der Kraftstoffinjektoren im Zylinderkopf oder einem anderen Bauteil der Brennkraftmaschine auftreten können, so dass eine sichere Abstützung des Kraftstoffinjektors im Zylinderkopf bzw. dem anderen Bauteil nicht gewährleistet ist. Damit ist eine derartige Kraftstoffeinspritzvorrichtung insbesondere nicht für eine Otto-Brennkraftmaschine mit direkter Kraftstoffeinspritzung in den Brennraum geeignet, da hier der mit dem Kraftstoffverteiler gekoppelte Kraftstof injektor mit einer vorgegebenen Vorspannkraft gegen den Zylinderkopf als Gegenkraft zu dem auf den Injektor wirkenden Brennraumdruck gespannt werden muß.The disadvantage is that after assembly of the fuel distributor on the internal combustion engine, different distances between the connecting pieces of the fuel distributor and the individual contact surfaces of the fuel injectors in the cylinder head or another component of the internal combustion engine can occur due to manufacturing tolerances, so that reliable support of the fuel injector in the cylinder head or the other component is not guaranteed. Thus, such a fuel injection device is in particular not suitable for a gasoline internal combustion engine with direct fuel injection into the combustion chamber, since here the fuel injector coupled to the fuel distributor must be tensioned against the cylinder head with a predetermined pretensioning force as a counterforce to the combustion chamber pressure acting on the injector.
Zum weiteren Stand der Technik wird die DE 39 19 231 Cl und DE 87 13 284 Ul zitiert.DE 39 19 231 Cl and DE 87 13 284 U1 are cited for the further prior art.
Der Erfindung liegt die Aufgabe zugrunde, die bekannte Kraftstoffeinspritzvorrichtung derart weiterzubilden, dass bei an der Brennkraftmaschine befestigtem Kraftstoffverteiler die einzelnen Kraftstoffinjektoren unabhängig von Fertigungstoleranzen mit einer vorgegebenen möglichst gleichen Vorspannkraft an der Brennkraftmaschine gehalten werden können.The invention has for its object to develop the known fuel injection device such that at attached to the internal combustion engine, the individual fuel injectors can be held on the internal combustion engine with a predetermined preload force that is as equal as possible, regardless of manufacturing tolerances.
Die Aufgabe ist erfindungsgemäß dadurch gelöst, dass der mindestens eine am Anschlußstutzen axial verschiebbar gehaltene Kraftstoffinjektor nur über die Formfeder als Niederhalter in Anlage an einem Bauteil der Brennkraftmaschine gehalten wird.The object is achieved in that the at least one fuel injector held axially displaceably on the connecting piece is held in contact with a component of the internal combustion engine only via the form spring as a hold-down device.
Durch die erfindungsgemäße Lösung wird in vorteilhafterweise erreicht, dass der Kraftstoffinjektor unabhängig von der Befestigung des Kraftstoffverteilers gegen ein Bauteil der Brennkraftmaschine verspannbar ist. Durch die Zwischenschaltung der Formfeder als Anpressmittel für den Kraftstoffinjektor können fertigungsbedingte Längenunterschiede zwischen dem Injektor und beispielsweise dem Zylinderkopf ausgeglichen werden, so dass der Kraftstoffinjektor sowie alle weiteren Injektoren im wesentlichen mit der gleichen Vorspannkraft gegen ein Bauteil, wie den Zylinderkopf der Brennkraftmaschine verspannt werden.The solution according to the invention advantageously ensures that the fuel injector can be braced against a component of the internal combustion engine independently of the fastening of the fuel distributor. By interposing the form spring as a pressing means for the fuel injector, production-related differences in length between the injector and, for example, the cylinder head can be compensated, so that the fuel injector and all other injectors are clamped against a component, such as the cylinder head of the internal combustion engine, essentially with the same pretensioning force.
In weiterer Ausgestaltung der Erfindung ist die Formfeder gabelförmig mit zwei Federzungen ausgebildet, wobei der Federsockel, von dem die Federzungen ausgehen an dem Kraftstoffverteiler befestigt ist.In a further embodiment of the invention, the shaped spring is fork-shaped with two spring tongues, the spring base, from which the spring tongues extend, being fastened to the fuel rail.
Ferner ist vorgesehen, dass die Federzungen an einem Gehäuse- abschnitt des Kraftstoffinjektors orientiert sind, der in a- xialer Richtung durch je eine radiale Bundfläche begrenzt ist. Dieser Gehäuseabschnitt zur Orientierung der Federzungen liegt benachbart zum zulaufseitigen Abschnitt des Kraftstoffinjektors .It is further provided that the spring tongues are oriented on a housing section of the fuel injector which is delimited in the axial direction by a radial flange surface. This housing section for orienting the spring tongues is adjacent to the section of the fuel injector on the inlet side.
Während der Zulaufseitige Abschnitt des Kraftstoffinjektors in einer Aufnahmebohrung des Anschlußstutzens geführt ist, wird durch die Formfeder die Halterung des Injektors am Kraftstoffverteiler gesichert.While the section of the fuel injector on the inlet side is guided in a receiving bore of the connecting piece, the injector bracket is secured to the fuel rail by the form spring.
Um eine Verdrehsicherung des Injektors gegenüber dem Kraftstoffverteiler zu erreichen, ist der Gehäuseabschnitt mit zwei sich gegenüberliegenden ebenen Anflächungen versehen. Dadurch, dass die Federzungen eng neben diesen ebenen Anflä- chungen liegen, ist ein Verdrehen des Kraftstoffinjektors verhindert .In order to prevent the injector from rotating relative to the fuel rail, the housing section is provided with two flat surfaces lying opposite one another. The fact that the spring tongues lie close to these flat surfaces prevents the fuel injector from twisting.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Zeichnung näher beschrieben.An embodiment of the invention is described below with reference to a drawing.
Die Zeichnung zeigt in einer perspektivischen Darstellung einen Ausschnitt einer Kraftstoffeinspritzvorrichtung mit einem Kraftstoffverteiler und einem einzigen an dem Kraftstoffverteiler angekoppelten Kraftstoffeinspitzinjektor. Die Anbin- dung weiterer Kraftstoffinjektoren an dem Kraftstoffverteiler erfolgt auf die gleiche Art und Weise wie dargestellt.The drawing shows a perspective view of a section of a fuel injection device with a fuel rail and a single fuel injector coupled to the fuel rail. Additional fuel injectors are connected to the fuel rail in the same way as shown.
Mit 1 ist allgemein eine Kraftstoffeinspritzvorrichtung zur direkten Einspritzung von Kraftstoff in einen Brennraum einer Otto-Brennkraftmaschine bezeichnet. Die Kraftstoffeinspitz- vorrichtung 1 umfaßt einen Kraftstoffverteiler 2, der als Verteilerrohr ausgeführt ist und dem der Kraftstoff aus dem Kraftstoffvorratsbehälter über eine Kraftstoffpumpe unter einem bestimmten Druck zugeführt wird. Der Kraftstoffverteiler 2 ist mit mehreren seitlich radial abstehenden Anschlußstutzen 3 zur Anbindung von Kraftstoffinjektoren 4 ausgebildet. Die Zahl der Anschlußstutzen 3 hängt dabei von der Anzahl der Zylinder der Brennkraftmaschine ab. Gemäß dem Ausführungsbei- spiel ist jeder Anschlußstutzen 3 an seinem freien Ende mit einem Flansch 5 ausgebildet, über den der Kraftstoff erteiler 2 an einem nicht näher dargestellten Bauteil 6 einer Otto- Brennkraftmaschine , z.B. durch Schrauben befestigt ist. Bei dem Bauteil 6 kann es sich dabei um die Zylinderkopfhaube, das Zylinderkopfgehäuse oder auch beispielsweise die Ansaug- luftleitung handeln. Der Anschlußstutzen 3 hat eine Aufnahmebohrung 7, in die der Kraftstoffinjektor 4 mit einem Zulauf- seitigen Injektorabschnitt 8 eingesetzt ist. Der Zulaufseiti- ge Injektorabschnitt 8 ist mit Nuten zur Aufnahme von Dicht- und Stützringen 9 versehen, über die eine flüssigkeitsdichte Verbindung zwischen dem Kraftstoffverteiler 2 und dem Kraftstoffinjektor 4 erzielt wird. Der Kraftstoffinjektor 4 ist innerhalb der Aufnahmebohrung 7 axial verschieblich eingesteckt, wobei mittels einer Formfeder 10 die Anbindung des Kraftstoffinjektors 4 an dem Kraftstoffverteiler 2 als eine Art Verliersicherung sichergestellt wird. Die Formfeder 10 besteht aus einem Befestigungsteil 11, von dem mit Abstand voneinander zwei Federzungen 12 und 13 abführen. Dabei ist das Befestigungsteil 11 an dem Flansch 5 durch Schrauben oder Klemmen befestigt. Beide Federzungen 12 und 13 sind in einer vom Kraftstoffverteiler 2 abgewandten Richtung vorgewölbt gestaltet und umgreifen dabei ein sich an den Injektorabschnitt 8 anschließendes Gehäuseoberteil 14, das in axialer Richtung durch je einen Anlagebund 15 bzw. 16 begrenzt ist. Beide Anlagebunde 15 und 16 sichern zusammen mit den Federzungen 12 und 13 den Kraftstoffinjektor 4 gegen Herausgleiten aus der Aufnahmebohrung 7. Ferner ist das Gehäuseoberteil 14 mit zwei sich gegenüberliegenden ebenen Anflächungen 17 (Schlüsselflächen) versehen, durch welche ein Verdrehen des Kraftstoffinjektors 4 gegenüber dem Kraftstoffverteiler 2 durch die Federzungen 12, 13 verhindert wird.1 generally designates a fuel injection device for the direct injection of fuel into a combustion chamber of an Otto engine. The fuel injection device 1 comprises a fuel distributor 2, which is designed as a distributor pipe and to which the fuel is fed from the fuel reservoir via a fuel pump under a certain pressure. The fuel rail 2 is formed with a plurality of laterally radially projecting connecting pieces 3 for connecting fuel injectors 4. The number of connection pieces 3 depends on the number of cylinders of the internal combustion engine. According to the exemplary embodiment, each connecting piece 3 is formed at its free end with a flange 5, by means of which the fuel distributor 2 is fastened to a component 6 of an Otto engine, not shown, for example by screws. Component 6 can be the cylinder head cover, the cylinder head housing or, for example, the intake act air duct. The connecting piece 3 has a receiving bore 7, into which the fuel injector 4 with an injector section 8 on the inlet side is inserted. The inlet-side injector section 8 is provided with grooves for receiving sealing and support rings 9, via which a liquid-tight connection between the fuel distributor 2 and the fuel injector 4 is achieved. The fuel injector 4 is inserted axially displaceably within the receiving bore 7, the connection of the fuel injector 4 to the fuel distributor 2 being ensured as a type of captive device by means of a shaped spring 10. The shaped spring 10 consists of a fastening part 11, from which two spring tongues 12 and 13 lead away from one another. The fastening part 11 is fastened to the flange 5 by screws or clamps. Both spring tongues 12 and 13 are bulged in a direction facing away from the fuel distributor 2 and encompass an upper housing part 14 which adjoins the injector section 8 and is delimited in the axial direction by a contact collar 15 and 16, respectively. Both system collars 15 and 16, together with the spring tongues 12 and 13, secure the fuel injector 4 against sliding out of the receiving bore 7. Furthermore, the upper housing part 14 is provided with two flat surfaces 17 (key surfaces) lying opposite one another, by means of which the fuel injector 4 is rotated relative to the fuel distributor 2 is prevented by the spring tongues 12, 13.
Über den Kraftstoffinjektor 4 wird der aus dem Kraftverteiler zugeleitete Kraftstoff direkt in den Brennraum der Brennkraftmaschine eingespritzt. Hierzu steht der Kraftstoffinjektor 4 mit seiner Einspritzdüse 18 in Kontakt mit dem nicht näher dargestellten Brennraum der Otto-Brennkraftmaschine. Dabei wir der Kraftstoffinjektor 4 von der Formfeder 10 gegen ein den Brennraum begrenzendes Wandteil, z.B. den Zylinderboden 19 gedrückt und innerhalb der Öffnung des Zylinderkopf- bodens durch einen Teflonring abgedichtet. Die Formfeder 10 ist konstruktiv so ausgelegt, dass die von den Federzungen 12, 13 erzeugte und auf den Kraftstoffinjektor 4 wirkende Vorspannkraft immer größer ist als die entgegengesetzt auf die Einspritzdüse 18 wirkende Gaskraft aus dem Brennraum.The fuel fed from the power distributor is injected directly into the combustion chamber of the internal combustion engine via the fuel injector 4. For this purpose, the fuel injector 4 with its injection nozzle 18 is in contact with the combustion chamber (not shown in more detail) of the Otto engine. The fuel injector 4 is pressed by the form spring 10 against a wall part delimiting the combustion chamber, for example the cylinder base 19, and sealed within the opening of the cylinder head base by a Teflon ring. The shaped spring 10 is designed such that the pretensioning force generated by the spring tongues 12, 13 and acting on the fuel injector 4 is always greater than the gas force from the combustion chamber acting in the opposite direction on the injection nozzle 18.
Da der Kraftstoffverteiler 2 an der Zylinderkopfhaube oder einem anderen Bauteil befestigt ist, können fertigungsbedingte Toleranzen zwischen dem Zylinderkopfboden als Anlagefläche 19 für den Kraftstoffinjektor 4 einerseits und dem Befestigungsort des KraftstoffVerteilers 2 auftreten. Gleichzeitig erfolgt ein Ausgleich der unterschiedlichen Wärmedehnungen zwischen dem Kraftstoffinjektor 4 aus Stahl und dem Zylinderkopf mit der Zylinderkopfhaube aus einer Aluminiumlegierung. Dadurch, dass der Kraftstoffinjektor 4 innerhalb der Aufnah- mebohrung 7 verschiebbar angeordnet ist, können diese Toleranzen ausgeglichen werden. Gleichzeitig wird hiermit erreicht, dass die von der Formfeder 10 als Niederhalter auf den Kraftstoffinjektor 4 ausgeübte Vorspannkraft bei allen Kraftstoffinjektoren im wesentlichen gleich ist. Since the fuel distributor 2 is attached to the cylinder head cover or another component, manufacturing-related tolerances can occur between the cylinder head base as a contact surface 19 for the fuel injector 4 on the one hand and the attachment location of the fuel distributor 2. At the same time, the different thermal expansions between the steel fuel injector 4 and the cylinder head with the cylinder head cover made of an aluminum alloy are compensated. Because the fuel injector 4 is displaceably arranged within the receiving bore 7, these tolerances can be compensated for. At the same time, this ensures that the biasing force exerted by the form spring 10 as a hold-down device on the fuel injector 4 is essentially the same for all fuel injectors.

Claims

Patentansprüche claims
1. Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine mit einem an der Brennkraftmaschine befestigten Kraftstoffverteiler, der mit mindestens einem seitlich abstehenden Anschlußstutzen zur flüssigkeitsdichten Aufnahme mindestens eines Zulaufseitigen Abschnittes eines Kraftstoffinjektors versehen ist, wobei der Kraftstoffinjektor über eine Formfeder am Kraftstoffverteiler gehalten ist und mit seinem Düsenkörper in Kontakt mit einem brennkraftmaschinenseiti- gen Gehäuseteil steht, d a d u r c h g e k e n n z e i c h n e t, dass der am Anschlußstutzen (3) axial verschiebbar gehaltene Kraftstoffinjektor (4) nur über die Formfeder (10) als Niederhalter in Anlage an dem Gehäuseteil (19) gehalten wird.1. Fuel injection device for an internal combustion engine with a fuel distributor attached to the internal combustion engine, which is provided with at least one laterally projecting connection piece for the liquid-tight reception of at least one inlet-side section of a fuel injector, the fuel injector being held on the fuel distributor via a shaped spring and in contact with its nozzle body a housing part on the internal combustion engine side, characterized in that the fuel injector (4) held axially displaceably on the connecting piece (3) is held in contact with the housing part (19) only via the form spring (10) as a hold-down device.
2. Kraftstoffeinspritzvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dass die an dem Kraftstoffverteiler (2) befestigten Formfedern (10) aus einem Befestigungsteil (11) mit davon gabelförmig ausgehenden zwei Federzungen (12 und 13) bestehen.2. Fuel injection device according to claim 1, so that the molded springs (10) attached to the fuel distributor (2) consist of a fastening part (11) with two spring tongues (12 and 13) extending therefrom in the form of a fork.
3. Kraftstoffeinspritzvorrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t, dass der Kraftstoffinjektor (4) im Anschluss an den Zulauf- seitigen Injektorabschnitt (8) ein in axialer Richtung durch je einen radialen Anlagebund (15, 16) begrenztes Gehäuseoberteil (14) für die Federzungen (12, 13) aufweist.3. Fuel injection device according to claim 1 or 2, characterized in that the fuel injector (4) in connection to the inlet-side injector section (8) in the axial direction by a radial contact collar (15, 16) limited housing upper part (14) for the spring tongues (12, 13).
4. Kraftstoffeinspritzvorrichtung nach einem der Ansprüche 1 bis 3 , d a d u r c h g e k e n n z e i c h n e t, dass das Gehäuseoberteil (14) mit zwei sich gegenüber liegenden ebenen Anflächungen (17) versehen ist. 4. Fuel injection device according to one of claims 1 to 3, characterized in that the upper housing part (14) is provided with two flat surfaces (17) lying opposite one another.
PCT/EP2003/008869 2002-08-27 2003-08-09 Device for fuel injection for an internal combustion engine WO2004025113A1 (en)

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DE10239142A DE10239142A1 (en) 2002-08-27 2002-08-27 Fuel injection device for an internal combustion engine

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EP2860389A1 (en) * 2013-10-14 2015-04-15 Continental Automotive GmbH Fuel injector assembly

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EP2860389A1 (en) * 2013-10-14 2015-04-15 Continental Automotive GmbH Fuel injector assembly
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