EP1440235B1 - Fixing device - Google Patents

Fixing device Download PDF

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Publication number
EP1440235B1
EP1440235B1 EP02774435A EP02774435A EP1440235B1 EP 1440235 B1 EP1440235 B1 EP 1440235B1 EP 02774435 A EP02774435 A EP 02774435A EP 02774435 A EP02774435 A EP 02774435A EP 1440235 B1 EP1440235 B1 EP 1440235B1
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EP
European Patent Office
Prior art keywords
fastening device
injection valve
fuel
fuel injection
spring
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
Application number
EP02774435A
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German (de)
French (fr)
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EP1440235A1 (en
Inventor
Werner Berger
Martin Mueller
Andreas Glaser
Anh Tuan Hoang
Martin Buehner
Cedric Olivier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1440235A1 publication Critical patent/EP1440235A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—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
    • 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
    • F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips
    • 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

Abstract

A mounting device for attaching a fuel injector both to a cylinder head of an internal combustion engine and to a fuel distribution line, includes two spring tongues which are insertable into a holding groove of the fuel injector or the fuel distribution line. A distance between the tips of the spring tongues is smaller than the largest diameter of the opening surface enclosed by them, and the spring tongues are radially elastically displaced with respect to an axis of the fuel injector. At least two spring elements, elastically displaced in the axial direction with respect to the spring tongues by either tensile or compressive forces, are formed and are axially non-positively, detachably connectable to the opposite fuel injector or the fuel distribution line via a catch connection.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Befestigungsvorrichtung zur Befestigung eines Brennstoffeinspritzventils an einem Zylinderkopf einer Brennkraftmaschine sowie zur Verbindung des Brennstoffeinspritzventils mit einer Brennstoffverteilerleitung nach der Gattung des Anspruchs 1.The invention is based on a fastening device for fastening a fuel injection valve to a cylinder head of an internal combustion engine and for connecting the fuel injection valve to a fuel distributor line according to the preamble of claim 1.

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 Anschlußstutzen 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 assembled state by corresponding recesses of the plug-in nipple and can be latched in a recess formed as an annular groove in a connecting piece 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, daß nur in beschränktem Umfang Niederhaltekräfte übertragen werden können. Insbesondere ist es nicht möglich, eine relativ gleichmäßige Niederhaltekraft über eine gewisse axiale Länge zu bewirken, um Lagetoleranzen auszugleichen. Der beschriebene Stand der Technik ist für eine Saugrohreinspritzanalage vorgesehen und bietet daher keine Lösung, wie Lagetoleranzen bei Hochdruckbrennstoffverteilerleitungen ausgeglichen werden können.A disadvantage of the DE 29 26 490 C2 known fastening device is that only a limited extent holding down forces can be transmitted. In particular, it is not possible to effect a relatively uniform holding force over a certain axial length to compensate for positional tolerances. The described prior art is intended for a Saugrohrhrespritzanalage and therefore offers no solution as positional tolerances can be compensated for high pressure fuel rail manifolds.

Die DE 197 35 665 A1 offenbart eine Brennstoffeinspritzanlage zum direkten Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine, mit zumindest einem Brennstoffeinspritzventil, wobei zwischen der Brennstoff-Einlassöffnung des Brennstoffeinspritzventils und der Brennstoff-Auslassöffnung ein rohrförmiges Zwischenstück vorgesehen ist.The DE 197 35 665 A1 discloses a fuel injection system for direct injection of fuel into a combustion chamber of an internal combustion engine, comprising at least one fuel injection valve, wherein between the fuel inlet opening of the fuel injection valve and the fuel outlet opening, a tubular intermediate piece is provided.

Eine Befestigungsvorrichtung für ein Brennstoffeinspritzventil mit den Merkmalen des Oberbegriffs des Anspruchs 1 ist aus der US 5,501,195 bekannt.A fastening device for a fuel injection valve having the features of the preamble of claim 1 is known from US 5,501,195 known.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Befestigungsvorrichtung für ein Brennstoffeinspritzventil mit den Merkmalen des unabhängigen Anspruchs 1 hat demgegenüber den Vorteil, daß Lagetoleranzen zwischen Brennstoffeinspritzventil und Brennstoffverteilerleitung, insbesondere axiale Lagetoleranzen, ausgeglichen werden können, indem die Federelemente axial weiter gespannt werden. Durch die Federelemente wird das Brennstoffeinspritzventil mit einer Niederhaltekraft in dem Zylinderkopf niedergehalten, wenn die Brennstoffverteilerleitung an dem Zylinderkopf befestigt wird und zu dem Zylinderkopf gedrückt wird. Die Federelemente werden dabei aus ihrer Ruhelage durch axialen Druck gespannt und üben diesen Druck auf das Brennstoffeinspritzventil als Niederhaltekraft aus.The fastening device according to the invention for a fuel injection valve with the features of independent claim 1 has the advantage that positional tolerances between fuel injector and fuel distributor line, in particular axial position tolerances can be compensated by the spring elements are axially stretched further. By the spring members, the fuel injection valve is held down with a hold-down force in the cylinder head when the fuel rail is fixed to the cylinder head and pressed to the cylinder head. The spring elements are stretched from their rest position by axial pressure and exert this pressure on the fuel injection valve as a hold-down force.

Weiterhin vorteilhaft kann das Brennstoffeinspritzventil durch die Befestigungsvorrichtung bereits bei der Montage mit. der Brennstoffverteilerleitung verbunden werden und kann bei jeder Demontage die Einheit aus Befestigungsvorrichtung, Brennstoffeinspritzventil und Brennstoffverteilerleitung komplett entnommen werden. Die Federelemente werden dabei auf Zug belastet und die Befestigungsvorrichtung kann das Brennstoffeinspritzventil aus dem Zylinderkopf herausziehen, da die Rastverbindungen, wie auch die Federzungen in der Haltenut auf Druck und Zug Kräfte übertragen.Further advantageous, the fuel injection valve by the fastening device already during assembly with. the fuel distributor line are connected and can be removed completely at each disassembly unit of fastening device, fuel injector and fuel rail. The spring elements are loaded to train and the fastening device can pull out the fuel injector from the cylinder head, as the locking connections, as well as the spring tongues in the holding transmitted to pressure and train forces.

Vorteilhafterweise entfallen bei der erfindungsgemäßen Befestigungsvorrichtung Schrauben oder Spannpratzen zur Befestigung an der Stirnseite des Zylinderkopfes.Advantageously, omitted in the fastening device according to the invention screws or clamps for attachment to the front side of the cylinder head.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Anspruch 1 angegebenen Befestigungsvorrichtung möglich.The measures listed in the dependent claims advantageous refinements and improvements of the independent claim 1 fastening device are possible.

Von Vorteil ist insbesondere, daß die Rastverbindungen durch Ausnehmungen in einem Abschnitt der Federelemente ausgebildet sind, in die Rasten des Brennstoffeinspritzventils oder der Brennstoffverteilerleitung einsetzbar sind. Diese Ausführung kann durch die radiale Elastizität der Federelemente einrasten und erfordert keinerlei weitere Bauteile.It is particularly advantageous that the latching connections are formed by recesses in a portion of the spring elements, can be used in the detents of the fuel injection valve or the fuel distribution line. This embodiment can engage by the radial elasticity of the spring elements and requires no further components.

Die Federelemente können in günstiger Ausführung nach radial außen eine Umfaltung aufweisen. Durch die Gestaltung eines gebogenen Abschnitts der Federelemente können die Federkonstanten auf Druck sowie auf Zug beeinflußt werden.The spring elements may have in a favorable embodiment radially outward refolding. The design of a bent portion of the spring elements, the spring constants can be influenced by pressure and train.

Die Befestigungsvorrichtung kann aus Kunststoffspritzguß bestehen.The fastening device may consist of plastic injection molding.

Alternativ ist die Befestigungsvorrichtung aus Federblech und als Stanzteil mit nachfolgendem Formbiegen gefertigt. Dabei können die Federzungen an ihrer der Haltenut zugewandten Seite zumindest in einem Teilbereich soweit axial umgebogen sein, daß beim Einsetzen in die Haltenut eine spielfreie, axial federnde Verklemmung auftritt.Alternatively, the fastening device is made of spring steel and as a stamped part with subsequent bending of the mold. In this case, the spring tongues may be on its side facing the retaining groove, at least in a partial area as far as axially bent, that a play-free, axially resilient jamming occurs when inserted into the retaining groove.

Durch die beiden Alternativen werden kostengünstige Herstellungsverfahren möglich.The two alternatives make cost-effective manufacturing possible.

Von Vorteil ist weiterhin, daß die Haltenut an dem Brennstoffeinspritzventil und die Rastverbindung an der Brennstoffverteilerleitung ausgeformt ist. Die Befestigung in der Haltenut erfordert die geringere Bauhöhe und ist deshalb günstig an dem Brennstoffeinspritzventil anzubringen.A further advantage is that the retaining groove is formed on the fuel injection valve and the latching connection to the fuel distribution line. The attachment in the retaining groove requires the lower height and is Therefore, cheap to install the fuel injector.

Zeichnungdrawing

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

Fig. 1
eine perspektivische Ansicht eines Ausführungsbeispiels einer erfindungsgemäßen Befestigungsvorrichtung,
Fig.2
eine schematische, geschnittene Ansicht des Ausführungsbeispiels der Fig. 1 in der Einbaulage an einem Brennstoffeinspritzventil und einer Brennstoffverteilerleitung,
Fig.3a
in einem schematischen Detailschnitt eine weitere Ausführungsform einer erfindungsgemäßen Befestigungsvorrichtung,
Fig.3b
in einem schematischen Detailschnitt eine weitere Ausführungsform einer erfindungsgemäßen Befestigungsvorrichtung, und
Fig.3c
in einem schematischen Detailschnitt eine weitere Ausführungsform einer erfindungsgemäßen Befestigungsvorrichtung.
Embodiments of the invention are shown in simplified form in the drawings and explained in more detail in the following description. Show it:
Fig. 1
a perspective view of an embodiment of a fastening device according to the invention,
Fig.2
a schematic, sectional view of the embodiment of the Fig. 1 in the installed position on a fuel injection valve and a fuel distributor line,
3a
in a schematic detail section of another embodiment of a fastening device according to the invention,
3b
in a schematic detail section of another embodiment of a fastening device according to the invention, and
3 c
in a schematic detail section of another embodiment of a fastening device according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt eine perspektivische Ansicht eines Ausführungsbeispiels einer erfindungsgemäßen Befestigungsvorrichtung 1 für ein Brennstoffeinspritzventil zur Befestigung an einer Brennstoffverteilerleitung. An der Befestigungsvorrichtung 1 sind zwei Feder zungen 2 ausgeformt, die zwischen sich eine Öffnungsfläche mit einem maximalen Durchmesser d2 freilassen. Diese Öffnungsfläche ist senkrecht zu einer gedachten Achse 3 orientiert, die identisch ist mit einer Symmetrieachse des Brennstoffeinspritzventils, das hier nicht dargestellt ist. Fig. 1 shows a perspective view of an embodiment of a fastening device 1 according to the invention for a fuel injection valve for attachment to a fuel rail. On the fastening device 1, two spring tongues 2 are formed, which between them an opening area with a allow maximum diameter d2. This opening area is oriented perpendicular to an imaginary axis 3, which is identical to an axis of symmetry of the fuel injection valve, which is not shown here.

Die Federzungen 2 weisen einen Spitzenabstand d1 auf, der kleiner ist als der Abstand d2. Die Befestigungsvorrichtung 1 kann über die Federzungen 2, die in eine Haltenut einsetzbar sind, an dem Brennstoffeinspritzventil befestigt werden. Es ist dabei möglich, die Befestigungsvorrichtung 1 seitlich aufzuschieben. In Längsrichtung der Achse 3 besteht dann eine kraftschlüssige Verbindung. An die Federzungen 2 schließen sich im vorliegenden Fall zwei Federelemente 4 an, die in Richtung der Achse 3 sowohl auf Druck, wie auch auf Zug federn können.The spring tongues 2 have a tip distance d1, which is smaller than the distance d2. The fastening device 1 can be attached to the fuel injection valve via the spring tongues 2, which are insertable into a retaining groove. It is possible to postpone the fastening device 1 laterally. In the longitudinal direction of the axis 3 then there is a frictional connection. In the present case, two spring elements 4 adjoin the spring tongues 2, which springs can spring in the direction of the axis 3 both on pressure and on tension.

In Fig. 1 ist die Befestigungsvorrichtung im entlasteten Zustand dargestellt, in dem keine Kraft auf die Federelemente 4 wirkt. In Anlageabschnitten 5 der Federelemente 4 sind Ausnehmungen 6 angeordnet, in denen beispielsweise die Brennstoffverteilerleitung mit entsprechenden Rasten einrasten kann. Dadurch ist eine kraftschlüssige Verbindung in Längsrichtung der Achse 3 mit der Brennstoffverteilerleitung möglich. Die Federelemente 4 weisen radial in Bezug auf die Achse 3 einen Umfaltungsbereich 7 auf, dessen Umfaltungen im vorliegenden Beispiel eher scharfkantig ausgeführt sind. In einem Kantenbereich 8 sind die Federzungen 2 leicht umgebogen.In Fig. 1 the fastening device is shown in the unloaded state in which no force acts on the spring elements 4. In contact sections 5 of the spring elements 4 recesses 6 are arranged, in which, for example, the fuel distribution line can engage with corresponding notches. As a result, a non-positive connection in the longitudinal direction of the axis 3 with the fuel distribution line is possible. The spring elements 4 have radially with respect to the axis 3 to a folding region 7, the folds are executed in the present example rather sharp. In an edge region 8, the spring tongues 2 are slightly bent.

Die Federelemente 4 weisen in Bezug auf die Längsrichtung der Achse 3 sowohl eine Federkonstante auf für eine Kraft, die den Abstand der Ausnehmungen 6 gegenüber den Federzungen 2 vergrößern will, als auch eine zweite Federkonstante für eine Kraft, die diesen Abstand zu verringern sucht. Es können somit in einem gewissen Elastizitätsbereich Kräfte zwischen den Aufnahmen 6 und den Federzungen 2 in Richtung der Achse 3 sowohl auf Druck wie auch auf Zug mit einem dazwischenliegenden neutralen Bereich übertragen werden. Fig. 2 zeigt eine schematische, geschnittene Ansicht des Ausführungsbeispiels der Fig. 1 in der Einbaulage für ein Brennstoffeinspritzventil 9, befestigt an einer Brennstoffverteilerleitung 10. Das Brennstoffeinspritzventil 9 ist mit einem Endabschnitt 11 in eine Aufnahmebohrung 12 der Brennstoffverteilerleitung 10 eingesetzt. Ein O-Ring 13, der von einem Stützring 14 gestützt wird, dichtet den Endabschnitt 11 gegen die Aufnahmebohrung 12 ab. Über eine Bohrung 15 läuft der Brennstoff der Aufnahmebohrung 12 zu. Die Befestigungsvorrichtung 1 ist mit ihren Ausnehmungen 6 in Rasten 16 an der Brennstoffverteilerleitung 10 eingeklipst. Die Befestigungsvorrichtung ist dabei in der Schnittebene der durch die Linie 2 und die Achse 3 in Fig. 1 definierten Ebene geschnitten dargestellt. Die Federzungen 2 mit dem Kantenbereich 8, der leicht umgebogen ist, sind in die Haltenut 17 eingesetzt, die an dem Brennstoffeinspritzventil 9 ausgeformt ist. Radial auswärts liegt der jeweilige Umfaltungsbereich 7 der beiden Federelemente 4. Die Teile der Federelemente 4 vor und nach dem Umfaltungsbereich 7 liegen hier nun nicht mehr parallel, da die Brennstoffverteilerleitung 10 eine Druckkraft in Richtung der Fließri-chtung des Brennstoffs auf das Brennstoffeinspritzventil 9 ausübt, die durch die Befestigungsvorrichtung 1 von den Rasten 16 auf die Haltenut 17 übertragen wird. Diese Haltekraft ist die nötige Niederhaltekraft, um das Brennstoffeinspritzventil an einem hier nicht dargestellten Zylinderkopf sicher gegen den Druck eines Brennraums zu halten. Durch die Umbiegung im Kantenbereich 8 wird ein Spiel der Federzungen 2 in der Haltenut 17 verhindert, da sich eine Verklemmung ergibt.The spring elements 4 have with respect to the longitudinal direction of the axis 3 both a spring constant for a force that wants to increase the distance of the recesses 6 relative to the spring tongues 2, as well as a second spring constant for a force that seeks to reduce this distance. It can thus be transmitted in a certain range of elasticity forces between the receptacles 6 and the spring tongues 2 in the direction of the axis 3 both on pressure as well as on train with an intermediate neutral range. Fig. 2 shows a schematic, sectional view of the embodiment of Fig. 1 in the installation position for a fuel injection valve 9, attached to a fuel distribution line 10. The fuel injection valve 9 is inserted with an end portion 11 in a receiving bore 12 of the fuel distribution line 10. An O-ring 13, which is supported by a support ring 14, seals the end portion 11 against the receiving bore 12 from. Via a bore 15, the fuel of the receiving bore 12 to. The fastening device 1 is clipped with their recesses 6 in detents 16 on the fuel rail 10. The fastening device is in the sectional plane of the line 2 and the axis 3 in Fig. 1 shown in a defined plane. The spring tongues 2 with the edge portion 8, which is slightly bent, are inserted into the retaining groove 17, which is formed on the fuel injection valve 9. The respective fold region 7 of the two spring elements 4 lies radially outward. The parts of the spring elements 4 before and after the fold region 7 no longer lie parallel here since the fuel distributor line 10 exerts a pressure force in the direction of the flow of the fuel onto the fuel injection valve 9, which is transmitted by the fastening device 1 of the detents 16 on the retaining groove 17. This holding force is the necessary hold-down force to keep the fuel injection valve on a cylinder head, not shown here, safe against the pressure of a combustion chamber. Due to the bend in the edge region 8 a play of the spring tongues 2 is prevented in the retaining groove 17, since there is a jamming.

Im Fall einer Demontage kann das Brennstoffeinspritzventil 9 zusammen mit der Brennstoffverteilerleitung 10 demontiert werden. Wenn die Brennstoffverteilerleitung 10 in Gegenrichtung zu der Strömungsrichtung des Brennstoffs in der Zulaufbohrung 15 gezogen wird, so wird jedes Federelement 4 über seinen Ruhepunkt hinweggezogen und übt nun keine Druckkraft auf das Brennstoffeinspritzventil 9 mehr aus. Vielmehr wird eine Zugkraft über die Haltenut 17 auf- das Brennstoffeinspritzventil 9 übertragen und das Brennstoffeinspritzventil 9 von einem Zylinderkopf weggezogen. Es kann somit zusammen mit der Brennstoffverteilerleitung 10 demontiert werden.In the case of disassembly, the fuel injection valve 9 can be dismantled together with the fuel distribution line 10. When the fuel rail 10 is pulled in the opposite direction to the flow direction of the fuel in the inlet bore 15, each spring element 4 is pulled over its rest point and now exerts no pressure force on the fuel injection valve 9 more. Rather, a tensile force on the retaining groove 17 to the Fuel injector 9 transmitted and the fuel injection valve 9 pulled away from a cylinder head. It can thus be dismantled together with the fuel distribution line 10.

Vorteilhafterweise kann jedoch auch die Brennstoffverteilerleitung 10 allein demontiert werden, indem zuvor die Befestigungsvorrichtung 1 entfernt wird. Dies kann erfolgen, indem die Anlagebereiche 5 der Federelemente 4 so weit radial nach außen gespannt werden, daß sie von den Rasten 16 entfernt werden können. Zugleich kann die Befestigungsvorrichtung, insgesamt, hier in der Darstellung nach vorne auf den Betrachter zu, aus der Haltenut 17 herausgezogen werden, indem sich die Federzungen 2 weit genug aufspreizen, daß der Abstand d1 in der Fig. 1 groß genug wird, um über den Durchmesser der Haltenut 17 in ihren Grund gezogen zu werden.Advantageously, however, the fuel distribution line 10 can be dismantled alone by previously the fastening device 1 is removed. This can be done by the contact areas 5 of the spring elements 4 are stretched so far radially outward that they can be removed from the latches 16. At the same time, the fastening device, in total, here in the representation forward to the viewer to be pulled out of the retaining groove 17 by the spring tongues 2 spread wide enough that the distance d1 in the Fig. 1 becomes large enough to be pulled over the diameter of the retaining groove 17 in its base.

Durch das Ausstanzen der Befestigungsvorrichtung 1 aus Federblech und nachfolgendem Formbiegen kann diese Befestigungsvorrichtung 1 leicht hergestellt werden und durch die Wahl geeigneter Materialien können auch große Niederhaltungskräfte übertragen werden. Dadurch können sonst nötige Bauteile, wie eine Befestigungspratze und Verschraubungsmittel vermieden werden.By punching out the fastening device 1 from spring steel sheet and subsequent bending this shape fastening device 1 can be easily made and by the choice of suitable materials and large hold-down forces can be transmitted. As a result, otherwise necessary components, such as a fastening claw and screwing can be avoided.

Die Fig. 3a, 3b und 3c zeigen in den schematischen Detailschnitten weitere Ausführungsformen der erfindungsgemäßen Befestigungsvorrichtung 1 in der Fig. 1 und der Fig. 2 mit abweichenden Umfaltungsbereichen gegenüber dem Umfaltungsbereich 7 in den Fig. 1 und 2. Die Befestigungsvorrichtung 1 ist dabei jeweils aufgrund der Symmetrie nur für eine Seite dargestellt. Dabei ist der Umfaltungsbereich 18a in Fig. 3a als Rundbogen ausgestaltet. Dadurch wird eine Kerbwirkung im Bereich des Federelements 4 vermieden. Das Biegemoment über den Rundbogen 18a ist relativ gleichmäßig. Fig. 3b zeigt beispielhaft einen spitzwinkligen Umfaltungsbereich 18b. Fig. 3c zeigt schließlich eine mehrfache Umfaltung 18c im Bereich der Federelemente 4.The Fig. 3a, 3b and 3c show in the schematic detail sections further embodiments of the fastening device 1 according to the invention in the Fig. 1 and the Fig. 2 with different folding areas compared to the folding area 7 in the Fig. 1 and 2 , The fastening device 1 is shown in each case only for one side due to the symmetry. In this case, the folding area 18a is in Fig. 3a designed as a round arch. As a result, a notch effect in the region of the spring element 4 is avoided. The bending moment over the round arch 18a is relatively uniform. Fig. 3b shows by way of example an acute-angled folding region 18b. Fig. 3c finally shows a multiple refolding 18c in the region of the spring elements 4th

Die beiden letztgenannten beispielhaften Ausführungsformen ermöglichen eine relativ niedrige Federkonstante.The two latter exemplary embodiments allow a relatively low spring constant.

Claims (8)

  1. Fastening device for the reciprocal fastening of a fuel injection valve (9) to a cylinder head of an internal combustion engine and of the fuel injection valve (9) to a fuel distributor line (10), with the fastening device (1) having two spring tongues (2) which can be inserted into a holding groove (17) of the fuel injection valve (9) or of the fuel distributor line, with a tip spacing (d1) of the spring tongues (2) being smaller than the greatest diameter (d2) of the opening area which is surrounded by said spring tongues (2), and the spring tongues (2) deflecting radially with respect to an axis (3) of the fuel injection valve (9),
    with at least two spring elements (4) being formed which adjoin the spring tongues (2) and which deflect in the axial direction with respect to the spring tongues (2) both under tension and under compression, which spring elements (4) can be connected axially, in a force-fitting, detachable manner, to the opposing fuel injection valve or the fuel distributor line (10) by means of a latching connection,
    characterized
    in that each of the at least two spring elements (4) has a radially outwardly folded portion.
  2. Fastening device according to Claim 1,
    characterized
    in that the latching connections are formed by recesses (6) in a section (5) of the spring elements (4), into which recesses (6) can be inserted catches (16) of the fuel injection valve or of the fuel distributor line (10).
  3. Fastening device according to Claim 1,
    characterized
    in that the folded portion is a multiple fold (18c).
  4. Fastening device according to one of Claims 1 to 3,
    characterized
    in that the fastening device (1) is composed of a plastic injection moulding.
  5. Fastening device according to one of Claims 1 to 4,
    characterized
    in that the fastening device (1) is composed of sheet spring steel and is produced as a punched part with subsequent shaping.
  6. Fastening device according to Claim 5,
    characterized
    in that the spring tongues (2), at their side facing towards the holding groove (17), are bent over axially at least in a partial region to such an extent that, when inserted into the holding groove (17), a play-free, axially resilient clamping action is generated.
  7. Fastening device according to one of Claims 1 to 6,
    characterized
    in that three or more spring elements are arranged radially uniformly.
  8. Fastening device according to one of Claims 1 to 7,
    characterized
    in that the holding groove (17) is formed on the fuel injection valve (9) and the latching connection is formed on the fuel distributor line (10).
EP02774435A 2001-10-24 2002-10-01 Fixing device Expired - Lifetime EP1440235B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10152421A DE10152421A1 (en) 2001-10-24 2001-10-24 fastening device
DE10152421 2001-10-24
PCT/DE2002/003715 WO2003038267A1 (en) 2001-10-24 2002-10-01 Fixing device

Publications (2)

Publication Number Publication Date
EP1440235A1 EP1440235A1 (en) 2004-07-28
EP1440235B1 true EP1440235B1 (en) 2008-02-13

Family

ID=7703533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774435A Expired - Lifetime EP1440235B1 (en) 2001-10-24 2002-10-01 Fixing device

Country Status (7)

Country Link
US (1) US7063075B2 (en)
EP (1) EP1440235B1 (en)
JP (1) JP4280632B2 (en)
CN (1) CN1312394C (en)
AT (1) ATE386207T1 (en)
DE (2) DE10152421A1 (en)
WO (1) WO2003038267A1 (en)

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Also Published As

Publication number Publication date
EP1440235A1 (en) 2004-07-28
CN1478176A (en) 2004-02-25
WO2003038267A1 (en) 2003-05-08
CN1312394C (en) 2007-04-25
ATE386207T1 (en) 2008-03-15
DE10152421A1 (en) 2003-06-18
JP4280632B2 (en) 2009-06-17
US20050066941A1 (en) 2005-03-31
DE50211699D1 (en) 2008-03-27
US7063075B2 (en) 2006-06-20
JP2005507052A (en) 2005-03-10

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