EP1722099B1 - Fastening device - Google Patents

Fastening device Download PDF

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Publication number
EP1722099B1
EP1722099B1 EP06117773A EP06117773A EP1722099B1 EP 1722099 B1 EP1722099 B1 EP 1722099B1 EP 06117773 A EP06117773 A EP 06117773A EP 06117773 A EP06117773 A EP 06117773A EP 1722099 B1 EP1722099 B1 EP 1722099B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
holding
cylinder head
hold
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.)
Expired - Lifetime
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EP06117773A
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German (de)
French (fr)
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EP1722099A3 (en
EP1722099A2 (en
Inventor
Uwe Liskow
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1722099A2 publication Critical patent/EP1722099A2/en
Publication of EP1722099A3 publication Critical patent/EP1722099A3/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
    • 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
    • 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

Definitions

  • the invention relates to a fastening device for fastening a fuel injection valve according to the preamble of the main claim.
  • a fastening device for a fuel injection valve for attachment to a suction tube in which the axial fixation of the fuel injection valve on the fuel distributor line or on a plug-in nipple by a fastener, which is designed as a U-shaped securing clip provided with two resiliently resilient legs is.
  • the securing clip engages in the mounted state by corresponding recesses of the plug-in nipple and can be latched into a recess formed as an annular groove in a connection socket of the fuel injection valve.
  • the axial clearance between the recesses and the securing clip as well as between the annular groove and the securing clip should be kept small in order to achieve an exact fixation of the fuel injection valve without tension of the seal.
  • a disadvantage of the DE 29 26 490 C2 known fastening device is in particular the bracing effect of the various mounting parts on the fuel injection valve.
  • the force flow generated in the fuel injection valve leads to deformations and thus to changes in the stroke of the valve needle to jamming and to a pressure or bending load of the housing parts, which are generally thin-walled and welded together at several points.
  • each fastening measure leads, for example by a support collar to increase the radial extent of the fuel injection valve and thus to an increased space requirement during installation.
  • the mounting device acts as a hold-down, which can be attached to an end face of the cylinder head, whereby the fuel injection valve is fixed in the receiving bore of the cylinder head.
  • the mounting device is supported on a shoulder formed on an inlet end of the fuel injection valve.
  • the fuel injector is enclosed by the mounting device by approximately 270 °, the mounting device being somewhat in the form of a one-piece hold-down pot.
  • a radially inwardly over the sleeve of the mounting device projecting collar engages in a groove on the fuel injection valve in order to perform the assembly and disassembly reliably.
  • the fastening device according to the invention for a fuel injection valve with the characterizing features of the main claim has the advantage that the fuel injection valve at a discharge end has an attached collar or paragraph, which acts on a flexible hold-down, which includes the end of the fuel injection valve in whole or in part, thereby the fuel injection valve is held down in the cylinder head.
  • axial or bending forces act on the valve housing only at the downstream end.
  • the hold-down is formed in the form of a hold-down pot, which gives the fuel injection valve in the receiving bore of the cylinder head greater stability.
  • Another advantage is the formation of slits and elastic tabs at the end of the hold-down pot, which allow a quick and easy assembly and disassembly of the fuel injector.
  • hold-downs can be produced simply by stamping from sheet metal and are suitable for individual fuel injection valves.
  • the hold-downs are fixed by screws in a simple manner on the front side of the cylinder head.
  • the fastening device can be installed in almost any receiving bore of a cylinder head and can thus also be used as an adapter for large bore cross-sections.
  • Fig. 1 shows a highly schematic partial section through an example of a fastening device for a fuel injection valve.
  • a fuel injection valve 1 is designed in the form of a directly injecting fuel injection valve 1, which is installed in a cylinder head 2 for the direct injection of fuel into a combustion chamber of a non-illustrated, in particular mixture-compressing spark-ignition internal combustion engine.
  • the fuel injection valve 1 has a connection to a fuel feed line 4 at an inlet end 3.
  • the fuel injection valve 1 has a connection 5 for the electrical contacting for actuating the fuel injection valve 1.
  • a shoulder 7 is formed, which bears against a wall 8 of a receiving bore 9 of the cylinder head 2.
  • the paragraph 7 can be made for example by turning, or it can be fixed by welding a spherical shape at the downstream end 6 of the fuel injection valve 1, which also still a good guide in the receiving bore 9 is achieved.
  • the fastening device 10 consists of a hold-down 11, which is formed in two parts in the present first embodiment and rests on the downstream end 6 of the fuel injection valve 1.
  • the Hold-down 11 punched from sheet metal, for example.
  • the hold-down devices 11 are supported on the shoulder 7 formed at the downstream end 6 of the fuel injection valve 1.
  • the hold-down devices 11 are provided with side parts 16 on an end face 12 of the cylinder head 2 either as in FIG Fig. 1 shown on the left, by means of a screwed into the cylinder head 2 screw 13, or, as in Fig. 1 shown right, attached by means of a likewise attached to the front side 12 of the cylinder head 2 clamping claw 14.
  • the latter is characterized by an easier mountability, as can be dispensed with a hole in the hold-11.
  • the preferred shape of the hold-down device 11 is chosen so that by the fixing of the side parts 16 on the front side 12 of the cylinder head 2, a spring action is created, which presses the fuel injection valve 1 via the shoulder 7 in the receiving bore 9 in the cylinder head 2.
  • the axial stability of the fuel injection valve 1 is achieved on the one hand by the leadership of the fuel line 4, on the other hand by the partial enclosure of the hold-11 in the region of the downstream end 6 of the fuel injection valve 1.
  • FIGS. 2A and 2B represent a schematic plan view of two variants of the fastening device 10 of the fuel injection valve 1. The same components are provided in all figures with corresponding reference numerals.
  • Fig. 2A In this case, represents a symmetrical pair of hold-down 11, which is for fastening a single Fuel injector 1 serve while Fig. 2B a possible series arrangement of a plurality of fuel injection valves 1 takes into account by each adjacent hold-down 11 are made in one piece for ease of attachment and further stabilization.
  • Fig. 3 shows a schematic plan view of an embodiment of an inventively designed fastening device 10 for a fuel injection valve.
  • a hold-down pot 17 in turn has two side parts 16 with holes 15 for fastening the hold-down pot 17 on the end face 12 of the cylinder head 2.
  • a recess 18 serves to carry out the electrical line, not shown, for actuating the fuel injection valve 1.
  • Such a hold-down pot 17 can be produced, for example, by deep-drawing.
  • At least one slit 19, in the present embodiment of which two are arranged symmetrically at a downstream end 22 of the hold-down pot 17 is provided.
  • the hold-down pot 17, as in Fig. 4 illustrates several stages 20 on.
  • FIG. 12 is a schematic view of the attachment operation of a fuel injection valve 1 in FIG 3 and 4 illustrated fastening device 10 is.
  • the fuel injection valve 1 If the fuel injection valve 1 is pressed further against the spring force of the tabs 21 in the hold-down pot 17, they grab the inlet side of the paragraph 7 back to their original shape and are applied to the fuel injector 1. At the same time can be achieved by a brief tightening of the mounted fuel injector 1, that the tabs 21 are supported on the shoulder 7 and fix the fuel injector 1 after mounting fuel injector 1 and hold-down pot 17 in the receiving bore 9 of the cylinder head 2. If the fuel injection valve 1 to be dismantled, it is pulled out of the hold-down pot 17, which is facilitated by a spherical shape of the paragraph 7.
  • the attachment of the hold-down pot 17 can be done as in the first example by means of screws 13 which are guided through the holes 15, or by means of clamping claws 14.
  • the invention is not limited to the illustrated embodiment and, for example, for fuel injection valves 1 for injection into the combustion chamber of a self-igniting internal combustion engine applicable.

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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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Befestigungsvorrichtung zur Befestigung eines Brennstoffeinspritzventils nach der Gattung des Hauptanspruchs.The invention relates to a fastening device for fastening a fuel injection valve according to the preamble of the main claim.

Es ist bereits aus der DE 29 26 490 C2 eine Befestigungsvorrichtung für ein Brennstoffeinspritzventil zur Befestigung an einem Saugrohr bekannt, bei welcher die axiale Fixierung des Brennstoffeinspritzventils an der Brennstoffverteilerleitung bzw. an einem Stecknippel durch ein Befestigungselement erfolgt, das als U-förmige Sicherungsklammer gestaltet ist, die mit zwei in radialer Richtung federnden Schenkeln versehen ist. Die Sicherungsklammer greift dabei im montierten Zustand durch entsprechende Aussparungen des Stecknippels und ist in eine als Ringnut ausgebildete Ausnehmung in einem Anschluss-Stutzen des Brennstoffeinspritzventils einrastbar. Das axiale Spiel zwischen den Aussparungen und der Sicherungsklammer sowie zwischen der Ringnut und der Sicherungsklammer soll dabei klein gehalten werden, um eine exakte Fixierung des Brennstoffeinspritzventils ohne Verspannungen der Dichtung zu erreichen.It is already out of the DE 29 26 490 C2 a fastening device for a fuel injection valve for attachment to a suction tube, in which the axial fixation of the fuel injection valve on the fuel distributor line or on a plug-in nipple by a fastener, which is designed as a U-shaped securing clip provided with two resiliently resilient legs is. The securing clip engages in the mounted state by corresponding recesses of the plug-in nipple and can be latched into a recess formed as an annular groove in a connection socket of the fuel injection valve. The axial clearance between the recesses and the securing clip as well as between the annular groove and the securing clip should be kept small in order to achieve an exact fixation of the fuel injection valve without tension of the seal.

Nachteilig an der aus der DE 29 26 490 C2 bekannten Befestigungsvorrichtung ist insbesondere die verspannende Wirkung der verschiedenen Halterungsteile auf das Brennstoffeinspritzventil. Der im Brennstoffeinspritzventil erzeugte Kraftfluss führt zu Verformungen und somit zu Hubänderungen der Ventilnadel bis zum Verklemmen sowie zu einer Druck- oder Biegebelastung der Gehäuseteile, die im allgemeinen dünnwandig und an mehreren Stellen miteinander verschweißt sind. Zudem führt jede Befestigungsmaßnahme beispielsweise durch einen Auflagebund zu einer Vergrößerung der radialen Ausdehnung des Brennstoffeinspritzventils und damit zu einem erhöhten Platzbedarf beim Einbau.A disadvantage of the DE 29 26 490 C2 known fastening device is in particular the bracing effect of the various mounting parts on the fuel injection valve. The force flow generated in the fuel injection valve leads to deformations and thus to changes in the stroke of the valve needle to jamming and to a pressure or bending load of the housing parts, which are generally thin-walled and welded together at several points. In addition, each fastening measure leads, for example by a support collar to increase the radial extent of the fuel injection valve and thus to an increased space requirement during installation.

Aus der WO 00/36295 A ist bereits eine Montagevorrichtung zur Montage und Demontage eines Brennstoffeinspritzventils in einer Aufnahmebohrung eines Zylinderkopfes einer Brennkraftmaschine bekannt Bei der Montage des Brennstoffeinspritzventils wirkt die Montagevorrichtung als Niederhalter, der an einer Stirnseite des Zylinderkopfes befestigt werden kann, wodurch das Brennstoffeinspritzventil in der Aufnahmebohrung des Zylinderkopfes fixiert wird. Die Montagevorrichtung stützt sich auf einem an einem zulaufseitigen Ende des Brennstoffeinspritzventils ausgebildeten Absatz ab. Das Brennstoffeinspritzventil wird von der Montagevorrichtung um ca. 270° umfasst, wobei die Montagevorrichtung in gewisser Weise die Form eines einstückig ausgeführten Niederhaltetopfes besitzt. Ein nach innen radial über die Hülse der Montagevorrichtung überstehender Kragen greift in eine Nut am Brennstoffeinspritzventil ein, um den Montage- bzw. Demontagevorgang zuverlässig ausführen zu können.From the WO 00/36295 A In the assembly of the fuel injection valve, the mounting device acts as a hold-down, which can be attached to an end face of the cylinder head, whereby the fuel injection valve is fixed in the receiving bore of the cylinder head. The mounting device is supported on a shoulder formed on an inlet end of the fuel injection valve. The fuel injector is enclosed by the mounting device by approximately 270 °, the mounting device being somewhat in the form of a one-piece hold-down pot. A radially inwardly over the sleeve of the mounting device projecting collar engages in a groove on the fuel injection valve in order to perform the assembly and disassembly reliably.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Befestigungsvorrichtung für ein Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass das Brennstoffeinspritzventil an einem abspritzseitigen Ende einen daran befestigten Bund oder Absatz aufweist, an welchem ein biegsamer Niederhalter angreift, welcher das Ende des Brennstoffeinspritzventils ganz oder teilweise umfasst, wodurch das Brennstoffeinspritzventil im Zylinderkopf niedergehalten wird. Dadurch wirken Axial- oder Biegekräfte nur am abströmseitigen Ende auf das Ventilgehäuse.The fastening device according to the invention for a fuel injection valve with the characterizing features of the main claim has the advantage that the fuel injection valve at a discharge end has an attached collar or paragraph, which acts on a flexible hold-down, which includes the end of the fuel injection valve in whole or in part, thereby the fuel injection valve is held down in the cylinder head. As a result, axial or bending forces act on the valve housing only at the downstream end.

Von Vorteil ist, dass der Niederhalter in Form eines Niederhaltetopfes ausgeformt ist, der dem Brennstoffeinspritzventil in der Aufnahmebohrung des Zylinderkopfes eine größere Stabilität verleiht.It is advantageous that the hold-down is formed in the form of a hold-down pot, which gives the fuel injection valve in the receiving bore of the cylinder head greater stability.

Ebenfalls von Vorteil ist dabei die Ausbildung von Schlitzungen und elastischen Laschen am Ende des Niederhaltetopfes, die eine schnelle und einfache Montage und Demontage des Brennstoffeinspritzventils erlauben.Another advantage is the formation of slits and elastic tabs at the end of the hold-down pot, which allow a quick and easy assembly and disassembly of the fuel injector.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Befestigungsvorrichtung möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim fastening device are possible.

Von Vorteil ist insbesondere, dass die Niederhalter einfach durch Stanzen aus Blech herstellbar und für einzelne Brennstoffeinspritzventile geeignet sind.It is of particular advantage that the hold-downs can be produced simply by stamping from sheet metal and are suitable for individual fuel injection valves.

Vorteilhafterweise sind die Niederhalter durch Schrauben in einfacher Weise an der Stirnseite des Zylinderkopfes fixiert.Advantageously, the hold-downs are fixed by screws in a simple manner on the front side of the cylinder head.

Durch Stufen im Niederhaltetopf ist die Befestigungsvorrichtung in nahezu jede Aufnahmebohrung eines Zylinderkopfes einbaubar und kann dadurch auch als Adapter bei zu großen Bohrungsquerschnitten verwendet werden.Through steps in the hold-down pot, the fastening device can be installed in almost any receiving bore of a cylinder head and can thus also be used as an adapter for large bore cross-sections.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
eine schematische Ansicht eines ersten Ausführungsbeispiels einer erfindungsgemäß ausgestalteten Befestigungsvorrichtung für ein Brennstoffeinspritzventil,
Fig. 2A-B
jeweils eine schematische Aufsicht auf die erfindungsgemäß ausgestaltete Befestigungsvorrichtung,
Fig. 3
eine schematische Aufsicht auf ein zweites Ausführungsbeispiel einer erfindungsgemäßen Befestigungsvorrichtung,
Fig. 4
eine schematische Schnittansicht der in Fig. 3 dargestellten Befestigungsvorrichtung, und
Fig. 5
eine schematische Ansicht des Befestigungsvorgangs eines Brennstoffeinspritzventils mit der in Fig. 3 und Fig. 4 dargestellten Befestigungsvorrichtung.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
FIG. 2 a schematic view of a first exemplary embodiment of a fastening device according to the invention for a fuel injection valve, FIG.
Fig. 2A-B
in each case a schematic plan view of the inventively designed fastening device,
Fig. 3
a schematic plan view of a second embodiment of a fastening device according to the invention,
Fig. 4
a schematic sectional view of in Fig. 3 illustrated fastening device, and
Fig. 5
a schematic view of the attachment process of a fuel injection valve with the in FIG. 3 and FIG. 4 illustrated fastening device.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt einen stark schematisierten Teilschnitt durch ein Beispiel einer Befestigungsvorrichtung für ein Brennstoffeinspritzventil. Fig. 1 shows a highly schematic partial section through an example of a fastening device for a fuel injection valve.

Ein Brennstoffeinspritzventil 1 ist dabei in Form eines direkt einspritzenden Brennstoffeinspritzventils 1 ausgeführt, das zum direkten Einspritzen von Brennstoff in einen Brennraum einer nicht weiter dargestellten, insbesondere gemischverdichtenden, fremdgezündeten Brennkraftmaschine in einen Zylinderkopf 2 eingebaut ist. Das Brennstoffeinspritzventil 1 weist an einem zulaufseitigen Ende 3 eine Verbindung zu einer Brennstoffzuleitung 4 auf. Das Brennstoffeinspritzventil 1 verfügt über einen Anschluss 5 für die elektrische Kontaktierung zur Betätigung des Brennstoffeinspritzventils 1.A fuel injection valve 1 is designed in the form of a directly injecting fuel injection valve 1, which is installed in a cylinder head 2 for the direct injection of fuel into a combustion chamber of a non-illustrated, in particular mixture-compressing spark-ignition internal combustion engine. The fuel injection valve 1 has a connection to a fuel feed line 4 at an inlet end 3. The fuel injection valve 1 has a connection 5 for the electrical contacting for actuating the fuel injection valve 1.

An einem abströmseitigen Ende 6 des Brennstoffeinspritzventils 1 ist ein Absatz 7 ausgebildet, der an einer Wandung 8 einer Aufnahmebohrung 9 des Zylinderkopfes 2 anliegt. Der Absatz 7 kann dabei beispielsweise durch Drehen hergestellt werden, oder es kann mittels Schweißen eine kugelige Form am abströmseitigen Ende 6 des Brennstoffeinspritzventils 1 befestigt werden, wodurch zudem noch eine gute Führung in der Aufnahmebohrung 9 erzielt wird.At a downstream end 6 of the fuel injection valve 1, a shoulder 7 is formed, which bears against a wall 8 of a receiving bore 9 of the cylinder head 2. The paragraph 7 can be made for example by turning, or it can be fixed by welding a spherical shape at the downstream end 6 of the fuel injection valve 1, which also still a good guide in the receiving bore 9 is achieved.

Um das Brennstoffeinspritzventil 1 in der Aufnahmebohrung 9 des Zylinderkopfes 2 zu fixieren, ist eine Befestigungsvorrichtung 10 vorgesehen. Die Befestigungsvorrichtung 10 besteht aus einem Niederhalter 11, welcher im vorliegenden ersten Ausführungsbeispiel zweiteilig ausgebildet ist und am abströmseitigen Ende 6 des Brennstoffeinspritzventils 1 anliegt. Vorzugsweise sind die Niederhalter 11 aus Blech beispielsweise gestanzt. Die Niederhalter 11 stützen sich an dem am abströmseitigen Ende 6 des Brennstoffeinspritzventils 1 ausgebildeten Absatz 7 ab. Die Niederhalter 11 sind mit Seitenteilen 16 an einer Stirnseite 12 des Zylinderkopfes 2 entweder, wie in Fig. 1 links dargestellt, mittels einer in den Zylinderkopf 2 einschraubten Schraube 13, oder, wie in Fig. 1 rechts dargestellt, mittels einer ebenfalls an der Stirnseite 12 des Zylinderkopfes 2 angebrachten Spannpratze 14 befestigt. Letztere zeichnet sich durch eine leichtere Montierbarkeit aus, da auf eine Bohrung im Niederhalter 11 verzichtet werden kann.In order to fix the fuel injection valve 1 in the receiving bore 9 of the cylinder head 2, a fastening device 10 is provided. The fastening device 10 consists of a hold-down 11, which is formed in two parts in the present first embodiment and rests on the downstream end 6 of the fuel injection valve 1. Preferably, the Hold-down 11 punched from sheet metal, for example. The hold-down devices 11 are supported on the shoulder 7 formed at the downstream end 6 of the fuel injection valve 1. The hold-down devices 11 are provided with side parts 16 on an end face 12 of the cylinder head 2 either as in FIG Fig. 1 shown on the left, by means of a screwed into the cylinder head 2 screw 13, or, as in Fig. 1 shown right, attached by means of a likewise attached to the front side 12 of the cylinder head 2 clamping claw 14. The latter is characterized by an easier mountability, as can be dispensed with a hole in the hold-11.

Die bevorzugte Form der Niederhalter 11 ist dabei so gewählt, dass durch die Fixierung der Seitenteile 16 an der Stirnseite 12 des Zylinderkopfes 2 eine Federwirkung entsteht, die das Brennstoffeinspritzventil 1 über den Absatz 7 in die Aufnahmebohrung 9 im Zylinderkopf 2 drückt. Die axiale Stabilität des Brennstoffeinspritzventils 1 wird dabei einerseits durch die Führung der Brennstoffleitung 4, andererseits durch die teilweise Umfassung der Niederhalter 11 im Bereich des abströmseitigen Endes 6 des Brennstoffeinspritzventils 1 erreicht.The preferred shape of the hold-down device 11 is chosen so that by the fixing of the side parts 16 on the front side 12 of the cylinder head 2, a spring action is created, which presses the fuel injection valve 1 via the shoulder 7 in the receiving bore 9 in the cylinder head 2. The axial stability of the fuel injection valve 1 is achieved on the one hand by the leadership of the fuel line 4, on the other hand by the partial enclosure of the hold-11 in the region of the downstream end 6 of the fuel injection valve 1.

Fig. 2A und 2B stellen eine schematische Aufsicht auf zwei Varianten der Befestigungsvorrichtung 10 des Brennstoffeinspritzventils 1 dar. Gleiche Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen. FIGS. 2A and 2B represent a schematic plan view of two variants of the fastening device 10 of the fuel injection valve 1. The same components are provided in all figures with corresponding reference numerals.

Blickt man in Strömungsrichtung des Brennstoffs auf die Befestigungsvorrichtung 10, erkennt man die über die Stirnseite 12 des Zylinderkopfes 2 herausragenden Seitenteile 16 der Niederhalter 11. Sie sind in Fig. 2A und 2B beispielhaft mit Bohrungen 15 zur Befestigung am Zylinderkopf 2 versehen.If one looks in the flow direction of the fuel on the fastening device 10, one recognizes the protruding over the end face 12 of the cylinder head 2 side parts 16 of the hold-down 11. They are in FIGS. 2A and 2B provided with holes 15 for attachment to the cylinder head 2, for example.

Fig. 2A stellt dabei ein symmetrisches Paar von Niederhaltern 11 dar, die zur Befestigung eines einzelnen Brennstoffeinspritzventils 1 dienen, während Fig. 2B einer möglichen Reihenanordnung mehrerer Brennstoffeinspritzventile 1 Rechnung trägt, indem zur einfacheren Befestigung und zur weiteren Stabilisierung jeweils benachbarte Niederhalter 11 einstückig ausgeführt sind. Fig. 2A In this case, represents a symmetrical pair of hold-down 11, which is for fastening a single Fuel injector 1 serve while Fig. 2B a possible series arrangement of a plurality of fuel injection valves 1 takes into account by each adjacent hold-down 11 are made in one piece for ease of attachment and further stabilization.

Fig. 3 zeigt eine schematische Aufsicht auf ein Ausführungsbeispiel einer erfindungsgemäß ausgestalteten Befestigungsvorrichtung 10 für ein Brennstoffeinspritzventil 1. Fig. 3 shows a schematic plan view of an embodiment of an inventively designed fastening device 10 for a fuel injection valve. 1

Im Gegensatz zu dem in Fig. 1 beschriebenen Ausführungsbeispiel der Befestigungsvorrichtung 10 ist das in Fig. 3 beschriebene erfindungsgemäße Ausführungsbeispiel einstückig bzw. in Topfform ausgebildet. Ein Niederhaltetopf 17 weist wiederum zwei Seitenteile 16 mit Bohrungen 15 zur Befestigung des Niederhaltetopfes 17 an der Stirnseite 12 des Zylinderkopfes 2 auf. Eine Ausnehmung 18 dient der Durchführung der nicht dargestellten elektrischen Leitung zur Betätigung des Brennstoffeinspritzventils 1. Ein solcher Niederhaltetopf 17 kann beispielsweise durch Tiefziehen hergestellt werden.Unlike the in Fig. 1 described embodiment of the fastening device 10 is the in Fig. 3 described inventive embodiment in one piece or in pot shape. A hold-down pot 17 in turn has two side parts 16 with holes 15 for fastening the hold-down pot 17 on the end face 12 of the cylinder head 2. A recess 18 serves to carry out the electrical line, not shown, for actuating the fuel injection valve 1. Such a hold-down pot 17 can be produced, for example, by deep-drawing.

Um das Brennstoffeinspritzventil 1 mit dem an seinem abströmseitigen Ende 6 ausgebildeten Absatz 7 in den Niederhaltetopf 17 einführen zu können, ist zumindest eine Schlitzung 19, im vorliegenden Ausführungsbeispiel derer zwei, die symmetrisch an einem abströmseitigen Ende 22 des Niederhaltetopfes 17 angeordnet sind, vorgesehen. Zur Anpassung an die äußere Form des Brennstoffeinspritzventils 1 bzw. der Aufnahmebohrung 9 des Zylinderkopfes 2 weist der Niederhaltetopf 17, wie in Fig. 4 verdeutlicht, mehrere Stufen 20 auf.In order to introduce the fuel injection valve 1 with the formed at its downstream end 6 paragraph 7 in the hold-17, at least one slit 19, in the present embodiment of which two are arranged symmetrically at a downstream end 22 of the hold-down pot 17 is provided. To adapt to the outer shape of the fuel injection valve 1 and the receiving bore 9 of the cylinder head 2, the hold-down pot 17, as in Fig. 4 illustrates several stages 20 on.

Fig. 5 stellt eine schematische Ansicht des Befestigungsvorgangs eines Brennstoffeinspritzventils 1 in der in Fig. 3 und 4 dargestellten Befestigungsvorrichtung 10 dar. Fig. 5 FIG. 12 is a schematic view of the attachment operation of a fuel injection valve 1 in FIG 3 and 4 illustrated fastening device 10 is.

Wie bereits weiter oben erwähnt, muss bei einer topfförmigen Ausbildung der Befestigungsvorrichtung 10 zumindest eine Schlitzung 19 vorhanden sein, um das durch den Absatz 7 verdickte Ende 6 des Brennstoffeinspritzventils 1 in den Niederhaltetopf 17 einrasten zu können. Der Vorgang, mittels dessen das Brennstoffeinspritzventil 1 in den Niederhaltetopf 17 eingefügt wird, ist in Fig. 5 stark schematisiert dargestellt.As already mentioned above, in a cup-shaped design of the fastening device 10, at least one slit 19 must be present in order to move through the shoulder 7 thickened end 6 of the fuel injection valve 1 to engage in the hold-17. The process by which the fuel injection valve 1 is inserted into the hold-down pot 17 is shown in FIG Fig. 5 shown in a very schematic way.

Beim Einschieben des Brennstoffeinspritzventils 1 weichen zunächst der Schlitzung 19 benachbarte Laschen 21 des Niederhaltetopfes 17 durch den Druck auf den Absatz 7 am abströmseitigen Ende 6 des Brennstoffeinspritzventils 1 zurück. Dies ist aus dem linken Teil von Fig. 5 ersichtlich.When inserting the fuel injection valve 1 first of the slit 19 adjacent tabs 21 of the hold-down pot 17 by the pressure on the shoulder 7 at the downstream end 6 of the fuel injection valve 1 back. This is from the left part of Fig. 5 seen.

Wird das Brennstoffeinspritzventil 1 weiter gegen die Federkraft der Laschen 21 in den Niederhaltetopf 17 gedrückt, schnappen diese zulaufseitig des Absatzes 7 in ihre ursprüngliche Form zurück und liegen am Brennstoffeinspritzventil 1 an. Gleichzeitig kann durch ein kurzzeitiges Anziehen des montierten Brennstoffeinspritzventils 1 erreicht werden, dass sich die Laschen 21 an dem Absatz 7 abstützen und nach der Montage von Brennstoffeinspritzventil 1 und Niederhaltetopf 17 in der Aufnahmebohrung 9 des Zylinderkopfes 2 das Brennstoffeinspritzventil 1 fixieren. Soll das Brennstoffeinspritzventil 1 demontiert werden, wird es aus dem Niederhaltetopf 17 herausgezogen, was durch eine kugelige Form des Absatzes 7 erleichtert wird.If the fuel injection valve 1 is pressed further against the spring force of the tabs 21 in the hold-down pot 17, they grab the inlet side of the paragraph 7 back to their original shape and are applied to the fuel injector 1. At the same time can be achieved by a brief tightening of the mounted fuel injector 1, that the tabs 21 are supported on the shoulder 7 and fix the fuel injector 1 after mounting fuel injector 1 and hold-down pot 17 in the receiving bore 9 of the cylinder head 2. If the fuel injection valve 1 to be dismantled, it is pulled out of the hold-down pot 17, which is facilitated by a spherical shape of the paragraph 7.

Die Befestigung des Niederhaltetopfes 17 kann wie im ersten Beispiel mittels Schrauben 13, die durch die Bohrungen 15 geführt werden, oder mittels Spannpratzen 14 erfolgen.The attachment of the hold-down pot 17 can be done as in the first example by means of screws 13 which are guided through the holes 15, or by means of clamping claws 14.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und beispielsweise auch für Brennstoffeinspritzventile 1 zur Einspritzung in den Brennraum einer selbstzündenden Brennkraftmaschine anwendbar.The invention is not limited to the illustrated embodiment and, for example, for fuel injection valves 1 for injection into the combustion chamber of a self-igniting internal combustion engine applicable.

Claims (3)

  1. Fastening device for fastening a fuel injection valve (1) in a cylinder head (2) of an internal combustion engine, with at least one holding-down device (11) which is fastened to one end face (12) of the cylinder head (2) and fixes the fuel injection valve (1) in a reception bore (9) of the cylinder head (2), the at least one holding-down device (11) being supported on a step (7), which is formed on the fuel injection valve (1), and at least partially surrounding the fuel injection valve (1), the holding-down device (11) being designed in the shape of a holding-down pot (17) produced in one piece, so that it is prestressed in the mounted state, characterized in that the holding-down device (11) is supported on a step (7), which is formed at an out flow-side and (6) of the fuel injection valve (1) and that the holding-down pot (17) has at least one slot (19) at an outflow side and (22), so that the holding-down pot (17) has at least one elastically deformable tab (21) at its outflow-side end (22).
  2. Fastening device according to Claim 1, characterized in that two slots (19) are provided on the outflow-side end (22) of the holding-down pot (17).
  3. Fastening device according to Claim 1 or 2, characterized in that the side parts (16) of the holding-down pot (17) are fixed to the end face (12) of the cylinder head (2) in each case by means of at least one screw (13) which projects through a bore (15) or in each case by means of at least one tension claw (14).
EP06117773A 2001-02-28 2002-02-27 Fastening device Expired - Lifetime EP1722099B1 (en)

Applications Claiming Priority (2)

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DE10109408A DE10109408A1 (en) 2001-02-28 2001-02-28 fastening device
EP02719641A EP1366285B1 (en) 2001-02-28 2002-02-27 Fastening device

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EP02719641A Division EP1366285B1 (en) 2001-02-28 2002-02-27 Fastening device

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EP1722099A3 EP1722099A3 (en) 2006-11-29
EP1722099B1 true EP1722099B1 (en) 2009-02-18

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EP (2) EP1366285B1 (en)
JP (1) JP2004518863A (en)
CN (1) CN1457393A (en)
CZ (1) CZ20023489A3 (en)
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WO (1) WO2002068815A1 (en)

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DE50208596D1 (en) 2006-12-14
DE50213305D1 (en) 2009-04-02
DE10109408A1 (en) 2002-09-05
CN1457393A (en) 2003-11-19
EP1722099A3 (en) 2006-11-29
JP2004518863A (en) 2004-06-24
EP1722099A2 (en) 2006-11-15
EP1366285A1 (en) 2003-12-03
US6772736B2 (en) 2004-08-10
CZ20023489A3 (en) 2004-05-12
EP1366285B1 (en) 2006-11-02
US20030154961A1 (en) 2003-08-21
WO2002068815A1 (en) 2002-09-06

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