EP1309797B1 - Compensation element for a fuel injection valve - Google Patents

Compensation element for a fuel injection valve Download PDF

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Publication number
EP1309797B1
EP1309797B1 EP01962601A EP01962601A EP1309797B1 EP 1309797 B1 EP1309797 B1 EP 1309797B1 EP 01962601 A EP01962601 A EP 01962601A EP 01962601 A EP01962601 A EP 01962601A EP 1309797 B1 EP1309797 B1 EP 1309797B1
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EP
European Patent Office
Prior art keywords
ring
rigid
compensation element
fuel injector
fuel
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EP01962601A
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German (de)
French (fr)
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EP1309797A1 (en
Inventor
Rainer Norgauer
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M61/14—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention is based on a compensating element for Fuel injection valve according to the preamble of claim 1.
  • DE 197 35 665 A1 describes a fuel injection system known that has a compensating element that consists of a Support body consists of a spherical support surface Has.
  • a fuel injector supports this Compensation element in a mounting hole of a Cylinder head. Because the fuel injector is on the spherical dome surface with a The fuel injector can support up to to a certain angular deviation from the axis of the Mounting hole can be mounted and firmly in the Location hole by suitable means, such as a Clamping claw can be pressed. This makes it easy Adaptation to the fuel supply lines enabled. Tolerances in the manufacture and assembly of the Fuel injectors can be balanced.
  • the support body is too expensive is to manufacture and a spherical surface to be produced precisely requires.
  • the rigid support body cannot are compressed and there is therefore no compensation in the axial direction of the location hole.
  • the balance of Tolerances can only be based on the given geometry Spherical surface. It is not purely for the mounting hole radial compensation movement possible.
  • the additional effort with several more is disadvantageous Components and the additional number of to be sealed Links. Because the intermediate piece has an additional height conditionally, it can only be made relatively short. This leads to that to be compensated for even at low Offset the axes a relatively large angle of Intermediate piece to the axes is required.
  • the Sealing with a sealing ring between Fuel injector and adapter on the one hand and Fuel outlet opening and intermediate piece on the other hand is only based on Elasticity of the respective sealing ring. If the angle is too large there is therefore a risk that the sealing rings are not one even pressure between the respective sealing surfaces subject to what can lead to leaks.
  • a heat protection sleeve is known from DE 197 43 103 A1, which is a fuel injector on a nozzle body encloses.
  • the heat protection sleeve is graded Location bore of a cylinder head Internal combustion engine used and encloses one spray-side nozzle body section one in the Receiving hole used fuel injector extensively.
  • the heat protection sleeve has one at one end Collar that abuts a step of the mounting hole. Furthermore, it has one at its spray end bent section, which over a certain length Sleeve is double-layered. In this area is the Sleeve between the nozzle body and the bore in the cylinder head radially jammed.
  • the fuel injector is also present an inclined step of the mounting hole, whereby the Axis position of the fuel injector completely is determined.
  • a fuel injector is already known, which is in a Location bore of a cylinder head of an internal combustion engine can be used.
  • the Fuel injection valve is used for the direct injection of fuel into one Combustion chamber of the internal combustion engine.
  • the fuel injector is surrounded by a three-part compensation element.
  • the compensating element has two Rigid copper rings that can be placed circumferentially on the fuel injector. Between the two copper rings there is an elastic one connected to both rings Intermediate ring arranged.
  • the two copper rings are flat, flat and disc-shaped executed only to be perpendicular to the longitudinal axis of the valve Shoulders of the fuel injector or shoulders of the fuel injector optimally support the mounting hole in the cylinder head.
  • the compensation element according to the invention with the has characteristic features of the main claim in contrast, the advantage that it is both a tilt of the Fuel injector to the axis of the location hole over a relatively wide range of angles as well Moving the fuel injector out of the Central axis, which allows the radial receiving hole. Moreover the compensation element according to the invention is simple and inexpensive to manufacture.
  • the compensating element transmits the axial force between the fuel injector and Location hole in the cylinder head through which the Fuel injection valve against the holding force fixing it supported.
  • the holding force and position of the Fuel injector can be set easily because the compensating element advantageously in the axial direction
  • the mounting hole yields flexibly and through the Compressibility of the intermediate ring the increase in Holding force over the immersion depth of the Fuel injector adjustable in the mounting hole is.
  • Compensating elements therefore leaves relatively large Manufacturing tolerances in the manufacture of both Cylinder head as well as in the manufacture of the Fuel injector and the fuel rail to.
  • the first ring has a conical surface. This can be on a conical shoulder of the Fuel injector come to rest. This will centered the fuel injector in the first ring and led. The tolerance compensation is then carried out safely elastic deformation of the intermediate ring and not by a incorrect position of the compensation element.
  • the first and second ring can be advantageous Sheet metal stampings exist that can be manufactured inexpensively are.
  • Fig. 1 shows a fuel injector 1 with a compensation element according to the invention 2.
  • the fuel injector 1 is used to inject fuel a mixture-compressing, spark-ignition internal combustion engine.
  • the fuel injector 1 shown is a high pressure injector for direct injection of Fuel in a combustion chamber 3 of the internal combustion engine, the in the drawing below one only partially shown Cylinder head 4 lies.
  • the invention Compensating element 2 can, however, also in other cases be applied.
  • the fuel injection valve 1 has a nozzle body 5 with a spray end 6 and is in one Receiving hole 7 of the cut, hinted shown cylinder head 4 mounted.
  • FIG. 1 further shows one in a groove 8 of the nozzle body 5 lying, combustion chamber-side sealing ring 9, the one Annular gap 10 between nozzle body 5 and receiving bore 7 seals and consists, for example, of Teflon®.
  • Fig. 1 shows further on the fuel injector 1 fuel feed 11 shown in section, for example a fuel distribution line, which means a sealing ring 12 opposite a connecting piece 13 of the Fuel injector 1 is sealed.
  • the sealing ring 12 is of a flange 14 of the connecting piece 13 and a support ring 15 out.
  • a connector 16 serves as an example here provided fuel injector 1 with electrical Control for connecting a not shown here electrical control line.
  • the compensating element 2 has a rigid first ring 18 as well as a rigid second ring 19 and an elastic Intermediate ring 20 on in the selected embodiment by vulcanizing the elastic made of rubber Intermediate ring 20 are non-detachably connected. It are also versions made of other elastic material such as for example another elastomer or Teflon® or a gluing of the elastic intermediate ring 20 with the first Ring 18 and second ring 19 conceivable.
  • a valve center axis 21 of the Fuel injector 1 shown This can be done by elastic deformation of the elastic intermediate ring 20 and a possible adjustment movement of the Fuel injector 1 to the geometric position of the Fuel inlet 11 both by a distance d and additionally by an angle ⁇ from a bore center axis 22 deviate.
  • Fig. 2 shows an enlarged view of section II in Fig. 1.
  • the nozzle body 5 is shown Housing section 23 of the fuel injector 1 with larger diameter and a conical shoulder 24 of the Fuel injector 1.
  • the compensating element 2 is shown cut.
  • the rigid first ring 18 has an inner conical surface 25 on the on the conical shoulder 24 of the Fuel injector 1 is present.
  • the rigid second ring 19 has a flat annular surface 26 which a gradation 27 of the receiving bore 7 is present.
  • the elastic intermediate ring 20 permanently connects the rigid first ring 18 and with the rigid second ring 19. Between Nozzle body 5 and receiving bore 7 is located Annular gap 10. Both the intermediate ring 20 and the second Ring 19 have a largely rectangular cross section on.
  • the fuel injector 1 is advantageously centered through the conical shoulder 24 and the conical surface 25 the rigid first ring 18 and can also on this to the Valve center axis 21 transmit radial forces.
  • the clamping claw not shown, turns that Fuel injector 1 by stronger on one side Compression of the elastic intermediate ring 20 automatically the necessary tilt angle ⁇ and by that of Fuel injector 1 transferred power to the necessary Distance d of a radial displacement, so that the Fuel inlet 11 with the fuel injection valve 1 is connected without tension.
  • the rigid first ring 18 is preferably in relation to FIG its center opposite the rigid second ring 19 in relation to its center through elastic deformation of the elastic intermediate ring 20 radially displaceable.
  • the rigid first ring 18 is preferably related on a central axis opposite the rigid.
  • second Ring 19 in relation to one laid by this Center axis through elastic deformation of the elastic intermediate ring 20 tiltable.
  • the elastic intermediate ring 20 also advantageously reduces the compensating element 2 a transmission of structure-borne noise, Vibrations and heat between cylinder head 4 and Fuel injector 1.

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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 einem Ausgleichselement für ein Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention is based on a compensating element for Fuel injection valve according to the preamble of claim 1.

Aus der DE 197 35 665 A1 ist eine Brennstoffeinspritzanlage bekannt, die ein Ausgleichselement aufweist, das aus einem Stützkörper besteht, der eine kalottenförmige Stützfläche hat. Ein Brennstoffeinspritzventil stützt sich über dieses Ausgleichselement in einer Aufnahmebohrung eines Zylinderkopfes ab. Da das Brennstoffeinspritzventil auf der kugelförmig ausgeformten Kalottenfläche mit einer Stützfläche aufliegt, kann das Brennstoffeinspritzventil bis zu einer gewissen Winkelabweichung zur Achse der Aufnahmebohrung montiert werden und fest in die Aufnahmebohrung durch geeignete Mittel, beispielsweise eine Spannpratze gedrückt werden. Somit wird eine einfache Anpassung an die Brennstoffzuleitungen ermöglicht. Toleranzen bei der Fertigung und bei der Montage der Brennstoffeinspritzventile können ausgeglichen werden.DE 197 35 665 A1 describes a fuel injection system known that has a compensating element that consists of a Support body consists of a spherical support surface Has. A fuel injector supports this Compensation element in a mounting hole of a Cylinder head. Because the fuel injector is on the spherical dome surface with a The fuel injector can support up to to a certain angular deviation from the axis of the Mounting hole can be mounted and firmly in the Location hole by suitable means, such as a Clamping claw can be pressed. This makes it easy Adaptation to the fuel supply lines enabled. Tolerances in the manufacture and assembly of the Fuel injectors can be balanced.

Nachteilig ist jedoch, daß der Stützkörper aufwendig zu fertigen ist und eine genau herzustellende Kugelfläche erfordert. Der starre Stützkörper kann nicht zusammengedrückt werden und es erfolgt somit kein Ausgleich in axialer Richtung der Aufnahmebohrung. Der Ausgleich von Toleranzen kann auch nur auf der vorgegebenen Geometrie der Kugelfläche erfolgen. Es ist keine rein zur Aufnahmebohrung radiale Ausgleichsbewegung möglich.However, it is disadvantageous that the support body is too expensive is to manufacture and a spherical surface to be produced precisely requires. The rigid support body cannot are compressed and there is therefore no compensation in the axial direction of the location hole. The balance of Tolerances can only be based on the given geometry Spherical surface. It is not purely for the mounting hole radial compensation movement possible.

Die in der DE 197 35 665 A1 vorgeschlagene Variante, die Kugelfläche an dem Zylinderkopf selbst auszuformen und somit ein eigenes Bauteil zu vermeiden, hat den zusätzlichen Nachteil, daß die eine hohe Genauigkeit erfordernde Kugelfläche in einer Bohrung an dem relativ großen Werkstück des gesamten Zylinderkopfs ausgebildet werden muß. Dies hat daher fertigungstechnische Nachteile.The variant proposed in DE 197 35 665 A1, the Form the spherical surface on the cylinder head itself and thus Avoiding your own component has the additional Disadvantage that the high accuracy required Spherical surface in a hole on the relatively large workpiece of the entire cylinder head must be formed. this has therefore manufacturing disadvantages.

Ebenfalls in der DE 197 35 665 A1 ist ein Zwischenstück an der Zulaufseite eines Brennstoffeinspritzventils vorgeschlagen, um einen Toleranzausgleich bezüglich der Achsen des Brennstoffeinspritzventils und einer Brennstoff-Auslaßöffnung einer Brennstoffverteilerleitung zu erreichen. Ein Düsenkörper des Brennstoffeinspritzventils wird dabei in eine Aufnahmebohrung eines Zylinderkopfes eingefügt und durch geeignete Haltemittel, beispielsweise eine Spannpratze, gehalten, wodurch die Lage der Achse des Brennstoffeinspritzventils vorgegeben ist. Der Ausgleich eines eventuellen Achsversatzes zwischen der Achse des Brennstoffeinspritzventils und der Achse der Brennstoff-Auslaßöffnung der Brennstoffverteilerleitung erfolgt durch Verkippen des dazwischen angeordneten Zwischenstücks. Dieses wird durch jeweils einen Dichtring zur Brennstoffverteilerleitung sowie zum Brennstoffeinspritzventil abgedichtet.Also in DE 197 35 665 A1 there is an intermediate piece the inlet side of a fuel injector proposed to compensate for tolerance regarding the Axes of the fuel injector and a fuel outlet to reach a fuel distribution line. A nozzle body of the fuel injector is in inserted a receiving bore of a cylinder head and by suitable holding means, for example a Clamping claw, which keeps the position of the axis of the Fuel injector is specified. The compensation a possible misalignment between the axis of the Fuel injector and the axis of the fuel outlet opening the fuel rail is done by Tilting the intermediate piece arranged between them. This is each by a sealing ring Fuel distribution line and to the fuel injector sealed.

Nachteilig ist der zusätzliche Aufwand mit mehreren weiteren Bauelementen und die zusätzliche Anzahl an abzudichtenden Verbindungen. Da das Zwischenstück eine zusätzliche Bauhöhe bedingt, kann es nur relativ kurz ausgebildet werden. Dies führt dazu, daß bereits bei geringem auszugleichenden Versatz der Achsen ein relativ großer Winkel des Zwischenstücks zu den Achsen erforderlich ist. Die Abdichtung mittels Dichtring zwischen Brennstoffeinspritzventil und Zwischenstück einerseits und Brennstoff-Auslaßöffnung und Zwischenstück andererseits beruht jedoch im Fall einer Abwinkelung nur auf der Elastizität des jeweiligen Dichtrings. Bei zu großem Winkel besteht daher die Gefahr, daß die Dichtringe nicht einer gleichmäßigen Pressung zwischen den jeweiligen Dichtflächen unterliegen, was zu Undichtigkeiten führen kann.The additional effort with several more is disadvantageous Components and the additional number of to be sealed Links. Because the intermediate piece has an additional height conditionally, it can only be made relatively short. This leads to that to be compensated for even at low Offset the axes a relatively large angle of Intermediate piece to the axes is required. The Sealing with a sealing ring between Fuel injector and adapter on the one hand and Fuel outlet opening and intermediate piece on the other hand However, in the case of an angle, it is only based on Elasticity of the respective sealing ring. If the angle is too large there is therefore a risk that the sealing rings are not one even pressure between the respective sealing surfaces subject to what can lead to leaks.

Aus der DE 197 43 103 A1 ist eine Wärmeschutzhülse bekannt, die ein Brennstoffeinspritzventil an einem Düsenkörper umschließt. Die Wärmeschutzhülse ist in eine abgestufte Aufnahmebohrung eines Zylinderkopfes einer Brennkraftmaschine eingesetzt und umschließt einen abspritzseitigen Düsenkörperabschnitt eines in die Aufnahmebohrung eingesetzten Brennstoffeinspritzventils umfänglich. Die Wärmeschutzhülse weist an einem Ende einen Kragen auf, der an einer Stufe der Aufnahmebohrung anliegt. Weiterhin weist sie an ihrem abspritzseitigen Ende einen umgebogenen Abschnitt auf, womit über eine gewisse Länge die Hülse doppellagig ausgebildet ist. In diesem Bereich ist die Hülse zwischen Düsenkörper und Bohrung im Zylinderkopf radial verklemmt. Da in Richtung der Brennstoffzuleitung des Brennstoffeinspritzventils auf den doppellagig ausgebildeten Abschnitt ein sich verjüngender Abschnitt der Wärmeschutzhülse folgt, an dem ein sich ebenfalls verjüngender Abschnitt des Brennstoffeinspritzventils anliegt, wird eine.gewisse axiale Kraftübertragung von dem Düsenkörper des Brennstoffeinspritzventils auf die Wärmeschutzhülse ermöglicht.A heat protection sleeve is known from DE 197 43 103 A1, which is a fuel injector on a nozzle body encloses. The heat protection sleeve is graded Location bore of a cylinder head Internal combustion engine used and encloses one spray-side nozzle body section one in the Receiving hole used fuel injector extensively. The heat protection sleeve has one at one end Collar that abuts a step of the mounting hole. Furthermore, it has one at its spray end bent section, which over a certain length Sleeve is double-layered. In this area is the Sleeve between the nozzle body and the bore in the cylinder head radially jammed. Because in the direction of the fuel supply line Fuel injector on the double-layered Section a tapered section of the Thermal protection sleeve follows, which is also a tapered section of the fuel injector is present, a certain axial power transmission from the Nozzle body of the fuel injector on the Heat protection sleeve enables.

Jedoch ist hierbei keinerlei Toleranzausgleich der Position des Brennstoffeinspritzventils in der Aufnahmebohrung möglich. Das Brennstoffeinspritzventil liegt außerdem an einer Schrägstufe der Aufnahmebohrung an, wodurch die Achsstellung des Brennstoffeinspritzventils vollständig bestimmt ist. However, there is no tolerance compensation of the position the fuel injector in the locating hole possible. The fuel injector is also present an inclined step of the mounting hole, whereby the Axis position of the fuel injector completely is determined.

Aus der JP 06-010794 A ist bereits ein Brennstoffeinspritzventil bekannt, das in eine Aufnahmebohrung eines Zylinderkopfes einer Brennkraftmaschine einsetzbar ist. Das Brennstoffeinspritzventil dient dabei zur direkten Einspritzung von Brennstoff in einen Brennraum der Brennkraftmaschine. Umgeben ist das Brennstoffeinspritzventil von einem dreiteiligen Ausgleichselement. Das Ausgleichselement weist dabei zwei umfänglich an dem Brennstoffeinspritzventil anlegbare starre Kupferringe auf. Zwischen den beiden Kupferringen ist ein mit beiden Ringen verbundener elastischer Zwischenring angeordnet. Die beiden Kupferringe sind flach, eben und scheibenförmig ausgeführt, um sich ausschließlich an senkrecht zur Ventillängsachse des Brennstoffeinspritzventils verlaufenden Schultern des Brennstoffeinspritzventils bzw. der Aufnahmebohrung im Zylinderkopf optimal abzustützen. From JP 06-010794 A a fuel injector is already known, which is in a Location bore of a cylinder head of an internal combustion engine can be used. The Fuel injection valve is used for the direct injection of fuel into one Combustion chamber of the internal combustion engine. The fuel injector is surrounded by a three-part compensation element. The compensating element has two Rigid copper rings that can be placed circumferentially on the fuel injector. Between the two copper rings there is an elastic one connected to both rings Intermediate ring arranged. The two copper rings are flat, flat and disc-shaped executed only to be perpendicular to the longitudinal axis of the valve Shoulders of the fuel injector or shoulders of the fuel injector optimally support the mounting hole in the cylinder head.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Ausgleichselement mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß es sowohl ein Verkippen des Brennstoffeinspritzventils zur Achse der Aufnahmebohrung über einen relativ großen Winkelbereich als auch ein Verschieben des Brennstoffeinspritzventils aus der Mittelachse, der Aufnahmebohrung radial ermöglicht. Außerdem ist das erfindungsgemäße Ausgleichselement einfach und kostengünstig zu fertigen. Das Ausgleichselement überträgt die axiale Kraft zwischen Brennstoffeinspritzventil und Aufnahmebohrung im Zylinderkopf, durch die sich das Brennstoffeinspritzventil gegen die es fixierende Haltekraft abstützt.The compensation element according to the invention with the has characteristic features of the main claim in contrast, the advantage that it is both a tilt of the Fuel injector to the axis of the location hole over a relatively wide range of angles as well Moving the fuel injector out of the Central axis, which allows the radial receiving hole. Moreover the compensation element according to the invention is simple and inexpensive to manufacture. The compensating element transmits the axial force between the fuel injector and Location hole in the cylinder head through which the Fuel injection valve against the holding force fixing it supported.

Daher kann die Haltekraft und Position des Brennstoffeinspritzventils problemlos eingestellt werden, da das Ausgleichselement vorteilhaft in axialer Richtung der Aufnahmebohrung flexibel nachgibt und durch die Komprimierbarkeit des Zwischenrings der Anstieg der Haltekraft über die Eintauchtiefe des Brennstoffeinspritzventils in die Aufnahmebohrung regelbar ist.Therefore, the holding force and position of the Fuel injector can be set easily because the compensating element advantageously in the axial direction The mounting hole yields flexibly and through the Compressibility of the intermediate ring the increase in Holding force over the immersion depth of the Fuel injector adjustable in the mounting hole is.

Die Verwendung eines erfindungsgemäß ausgebildeten Ausgleichselements läßt daher relativ große Fertigungstoleranzen bei der Herstellung sowohl des Zylinderkopfs als auch bei der Herstellung des Brennstoffeinspritzventils und der Brennstoffverteilerleitung zu.The use of a trained according to the invention Compensating elements therefore leaves relatively large Manufacturing tolerances in the manufacture of both Cylinder head as well as in the manufacture of the Fuel injector and the fuel rail to.

Entsprechend Anspruch 1 weist der erste Ring eine Kegelfläche auf. Diese kann an einer kegelförmigen Schulter des Brennstoffeinspritzventils zu liegen kommen. Dadurch wird das Brennstoffeinspritzventil in dem ersten Ring zentriert und geführt. Der Toleranzausgleich erfolgt dann sicher durch elastische Verformung des Zwischenrings und nicht durch eine fehlerhafte Lage des Ausgleichselements.According to claim 1, the first ring has a conical surface. This can be on a conical shoulder of the Fuel injector come to rest. This will centered the fuel injector in the first ring and led. The tolerance compensation is then carried out safely elastic deformation of the intermediate ring and not by a incorrect position of the compensation element.

Durch die in den Unteransprüchen angegebenen Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Ausgleichselements möglich.By the measures specified in the subclaims advantageous developments and improvements in Main claim specified compensation elements possible.

Vorteilhaft können erster und zweiter Ring aus Blechstanzteilen bestehen, die kostengünstig herzustellen sind.The first and second ring can be advantageous Sheet metal stampings exist that can be manufactured inexpensively are.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
ein mit einem erfindungsgemäßen Ausgleichselement in einen Zylinderkopf eingesetztes Brennstoffeinspritzventil, wobei das Ausgleichselement und der Zylinderkopf geschnitten dargestellt sind, und
Fig. 2
eine vergrößerte Darstellung des Ausschnitts II in Fig. 1.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a fuel injector inserted with a compensating element according to the invention in a cylinder head, the compensating element and the cylinder head being shown in section, and
Fig. 2
an enlarged view of section II in FIG. 1st

Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig. 1 zeigt ein Brennstoffeinspritzventil 1 mit einem erfindungsgemäßen Ausgleichselement 2. Das Brennstoffeinspritzventil 1 dient zum Einspritzen von Brennstoff bei einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine. Das dargestellte Brennstoffeinspritzventil 1 ist ein Hochdruckeinspritzventil zum direkten Einspritzen von Brennstoff in einen Brennraum 3 der Brennkraftmaschine, der in der Zeichnung unterhalb eines nur zum Teil dargestellten Zylinderkopfes 4 liegt. Das erfindungsgemäße Ausgleichselement 2 kann jedoch auch in anderen Fällen angewandt werden. Fig. 1 shows a fuel injector 1 with a compensation element according to the invention 2. The fuel injector 1 is used to inject fuel a mixture-compressing, spark-ignition internal combustion engine. The fuel injector 1 shown is a high pressure injector for direct injection of Fuel in a combustion chamber 3 of the internal combustion engine, the in the drawing below one only partially shown Cylinder head 4 lies. The invention Compensating element 2 can, however, also in other cases be applied.

Das Brennstoffeinspritzventil 1 weist einen Düsenkörper 5 mit einem abspritzseitigen Ende 6 auf und ist in einer Aufnahmebohrung 7 des geschnitten, andeutungsweise dargestellten Zylinderkopfes 4 montiert.The fuel injection valve 1 has a nozzle body 5 with a spray end 6 and is in one Receiving hole 7 of the cut, hinted shown cylinder head 4 mounted.

Fig. 1 zeigt weiter einen in einer Nut 8 des Düsenkörpers 5 liegenden, brennraumseitigen Dichtring 9, der einen Ringspalt 10 zwischen Düsenkörper 5 und Aufnahmebohrung 7 abdichtet und beispielsweise aus Teflon® besteht. Fig. 1 zeigt weiter am Brennstoffeinspritzventil 1 einen geschnitten dargestellten Brennstoffzulauf 11, beispielsweise einer Brennstoffverteilerleitung, der mittels eines Dichtrings 12 gegenüber einem Anschlußstutzen 13 des Brennstoffeinspritzventils 1 abgedichtet ist. Der Dichtring 12 wird von einem Flansch 14 des Anschlußstutzens 13 und einem Stützring 15 geführt.1 further shows one in a groove 8 of the nozzle body 5 lying, combustion chamber-side sealing ring 9, the one Annular gap 10 between nozzle body 5 and receiving bore 7 seals and consists, for example, of Teflon®. Fig. 1 shows further on the fuel injector 1 fuel feed 11 shown in section, for example a fuel distribution line, which means a sealing ring 12 opposite a connecting piece 13 of the Fuel injector 1 is sealed. The sealing ring 12 is of a flange 14 of the connecting piece 13 and a support ring 15 out.

Ein Anschlußstecker 16 dient für das hier beispielhaft vorgesehene Brennstoffeinspritzventil 1 mit elektrischer Ansteuerung zum Anschluß einer hier nicht dargestellten elektrischen Steuerleitung.A connector 16 serves as an example here provided fuel injector 1 with electrical Control for connecting a not shown here electrical control line.

Auf einen Bund 17 am Düsenkörper 5 des Brennstoffeinspritzventils 1 drückt ein hier nicht dargestellter Niederhalter, der das Brennstoffeinspritzventil 1 in der Aufnahmebohrung 7 hält.On a collar 17 on the nozzle body 5 of the Fuel injector 1 does not press here shown hold-down device, the fuel injector 1 in the mounting hole 7 holds.

Das Ausgleichselement 2 weist einen starren ersten Ring 18 sowie einen starren zweiten Ring 19 und einen elastischen Zwischenring 20 auf, die in der gewählten Ausführungsform durch Vulkanisation des in Gummi ausgeführten elastischen Zwischenrings 20 unlösbar miteinander verbunden sind. Es sind auch Ausführungen aus anderem elastischen Material wie beispielsweise einem anderen Elastomer oder Teflon® oder eine Verklebung des elastischen Zwischenrings 20 mit erstem Ring 18 und zweitem Ring 19 denkbar.The compensating element 2 has a rigid first ring 18 as well as a rigid second ring 19 and an elastic Intermediate ring 20 on in the selected embodiment by vulcanizing the elastic made of rubber Intermediate ring 20 are non-detachably connected. It are also versions made of other elastic material such as for example another elastomer or Teflon® or a gluing of the elastic intermediate ring 20 with the first Ring 18 and second ring 19 conceivable.

Zur Verdeutlichung der Ausgleichsfunktion des Ausgleichselements 2 ist eine Ventilmittelachse 21 des Brennstoffeinspritzventils 1 eingezeichnet. Diese kann durch elastische Verformung des elastischen Zwischenrings 20 und eine dadurch mögliche Anpassungsbewegung des Brennstoffeinspritzventils 1 an die geometrische Lage des Brennstoffzulaufs 11 sowohl um eine Distanz d als auch zusätzlich um einen Winkel α von einer Bohrungsmittelachse 22 abweichen.To clarify the compensation function of the Compensation element 2 is a valve center axis 21 of the Fuel injector 1 shown. This can be done by elastic deformation of the elastic intermediate ring 20 and a possible adjustment movement of the Fuel injector 1 to the geometric position of the Fuel inlet 11 both by a distance d and additionally by an angle α from a bore center axis 22 deviate.

Fig. 2 zeigt eine vergrößerte Darstellung des Ausschnitts II in Fig. 1. Dargestellt ist der Düsenkörper 5, ein Gehäuseabschnitt 23 des Brennstoffeinspritzventils 1 mit größerem Durchmesser und eine kegelförmige Schulter 24 des Brennstoffeinspritzventils 1. Das Ausgleichselement 2 ist geschnitten dargestellt.Fig. 2 shows an enlarged view of section II in Fig. 1. The nozzle body 5, is shown Housing section 23 of the fuel injector 1 with larger diameter and a conical shoulder 24 of the Fuel injector 1. The compensating element 2 is shown cut.

Der starre erste Ring 18 weist eine innere Kegelfläche 25 auf, die an der kegelförmigen Schulter 24 des Brennstoffeinsprizventils 1 anliegt. Der starre zweite Ring 19 weist eine ebene kreisringförmige Fläche 26 auf, die an einer Abstufung 27 der Aufnahmebohrung 7 anliegt. Der elastische Zwischenring 20 verbindet unlösbar den starren ersten Ring 18 und mit dem starren zweiten Ring 19. Zwischen Düsenkörper 5 und Aufnahmebohrung 7 befindet sich ein Ringspalt 10. Sowohl der Zwischenring 20 als auch der zweite Ring 19 weisen einen weitgehend rechteckförmigen Querschnitt auf.The rigid first ring 18 has an inner conical surface 25 on the on the conical shoulder 24 of the Fuel injector 1 is present. The rigid second ring 19 has a flat annular surface 26 which a gradation 27 of the receiving bore 7 is present. The elastic intermediate ring 20 permanently connects the rigid first ring 18 and with the rigid second ring 19. Between Nozzle body 5 and receiving bore 7 is located Annular gap 10. Both the intermediate ring 20 and the second Ring 19 have a largely rectangular cross section on.

Vorteilhaft zentriert sich das Brennstoffeinspritzventil 1 durch die kegelförmige Schulter 24 und die Kegelfläche 25 an dem starren ersten Ring 18 und kann auf diesen auch zu der Ventilmittelachse 21 radiale Kräfte übertragen. Beim Anziehen der nicht dargestellten Spannpratze stellt sich das Brennstoffeinspritzventil 1 durch einseitig stärkere Kompression des elastischen Zwischenrings 20 selbsttätig auf den nötigen Kippwinkel α und durch die von dem Brennstoffeinspritzventil 1 übertragene Kraft auf die nötige Distanz d einer radialen Verschiebung ein, so daß der Brennstoffzulauf 11 mit dem Brennstoffeinspritzventil 1 spannungsfrei verbunden ist. The fuel injector 1 is advantageously centered through the conical shoulder 24 and the conical surface 25 the rigid first ring 18 and can also on this to the Valve center axis 21 transmit radial forces. At the Tightening the clamping claw, not shown, turns that Fuel injector 1 by stronger on one side Compression of the elastic intermediate ring 20 automatically the necessary tilt angle α and by that of Fuel injector 1 transferred power to the necessary Distance d of a radial displacement, so that the Fuel inlet 11 with the fuel injection valve 1 is connected without tension.

Daneben kann auch durch stärkeres Zusammendrücken des elastischen Zwischenrings 20 auf seinem vollen Umfang eine eventuelle Höhendifferenz ausgeglichen werden.In addition, by pressing the elastic intermediate ring 20 on its full circumference possible height difference can be compensated.

Der starre erste Ring 18 ist vorzugsweise in Bezug auf seinen Mittelpunkt gegenüber dem starren zweiten Ring 19 in Bezug auf dessen Mittelpunkt durch elastische Verformung des elastischen Zwischenrings 20 radial verschiebbar.The rigid first ring 18 is preferably in relation to FIG its center opposite the rigid second ring 19 in relation to its center through elastic deformation of the elastic intermediate ring 20 radially displaceable.

Ebenso ist der starre erste Ring 18 vorzugsweise in Bezug auf eine Mittelpunktsachse gegenüber dem starren. zweiten Ring 19 in Bezug auf eine durch diesen gelegte Mittelpunktsachse durch elastische Verformung des elastischen Zwischenrings 20 verkippbar.Likewise, the rigid first ring 18 is preferably related on a central axis opposite the rigid. second Ring 19 in relation to one laid by this Center axis through elastic deformation of the elastic intermediate ring 20 tiltable.

Ebenfalls vorteilhaft mindert der elastische Zwischenring 20 des Ausgleichselements 2 eine Übertragung von Körperschall, Schwingungen und Wärme zwischen Zylinderkopf 4 und Brennstoffeinspritzventil 1.The elastic intermediate ring 20 also advantageously reduces the compensating element 2 a transmission of structure-borne noise, Vibrations and heat between cylinder head 4 and Fuel injector 1.

Claims (7)

  1. Compensation element (2) for a fuel injection valve (1) capable of being inserted into a receiving bore (7) of a cylinder head (4) of an internal combustion engine and intended for the direct injection of fuel into the combustion space (3) of the internal combustion engine, the said compensation element having a rigid first ring (18) capable of being laid circumferentially against the fuel injection valve (1), a rigid second ring (19) which is capable of being inserted into the receiving bore (7), and an elastic intermediate ring (20) connected unreleasably to the rigid first ring (18) and the rigid second ring (19) and arranged between these rings (18, 19), characterized in that the rigid first ring (18) has a conical face (25) which is capable of being laid against a conical shoulder (24) of the fuel injection valve (1).
  2. Compensation element according to Claim 1, characterized in that the elastic intermediate ring (20) consists of an elastomer and the rigid first ring (18) and the rigid second ring (19) consist of metal.
  3. Compensation element according to Claim 2, characterized in that the rigid first ring (18) and the rigid second ring (19) are connected to the elastic intermediate ring (20) by vulcanization.
  4. Compensation element according to one of Claims 1 to 3, characterized in that the rigid second ring (19) has a plane annular face (26) which is capable of being laid against a step (27) of the receiving bore (7).
  5. Compensation element according to one of Claims 1 to 4, characterized in that the rigid first ring (18) and/or the rigid second ring (19) consist of a sheet-metal stamping.
  6. Compensation element according to one of Claims 1 to 5, characterized in that the rigid first ring (18) is radially displaceable in terms of its centre point with respect to the rigid second ring (19) in terms of its centre point as a result of the elastic deformation of the elastic intermediate ring (20).
  7. Compensation element according to one of Claims 1 to 6, characterized in that the rigid first ring (18) is tiltable in terms of a centre-point axis with respect to the rigid second ring (19) in terms of a centre-point axis drawn through the latter as a result of elastic deformation of the elastic intermediate ring (20).
EP01962601A 2000-08-09 2001-08-03 Compensation element for a fuel injection valve Expired - Lifetime EP1309797B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10038763 2000-08-09
DE10038763A DE10038763A1 (en) 2000-08-09 2000-08-09 Compensation element for a fuel injector
PCT/DE2001/002967 WO2002012718A1 (en) 2000-08-09 2001-08-03 Compensation element for a fuel injection valve

Publications (2)

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EP1309797A1 EP1309797A1 (en) 2003-05-14
EP1309797B1 true EP1309797B1 (en) 2004-11-03

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EP01962601A Expired - Lifetime EP1309797B1 (en) 2000-08-09 2001-08-03 Compensation element for a fuel injection valve

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US (1) US6899087B2 (en)
EP (1) EP1309797B1 (en)
JP (1) JP2004506136A (en)
KR (1) KR20030023735A (en)
CN (1) CN1446288A (en)
CZ (1) CZ2003389A3 (en)
DE (2) DE10038763A1 (en)
WO (1) WO2002012718A1 (en)

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Also Published As

Publication number Publication date
DE10038763A1 (en) 2002-02-21
JP2004506136A (en) 2004-02-26
US20040020470A1 (en) 2004-02-05
EP1309797A1 (en) 2003-05-14
KR20030023735A (en) 2003-03-19
CZ2003389A3 (en) 2004-09-15
US6899087B2 (en) 2005-05-31
DE50104417D1 (en) 2004-12-09
CN1446288A (en) 2003-10-01
WO2002012718A1 (en) 2002-02-14

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