EP2176539B1 - Fuel injection system comprising compensation element - Google Patents

Fuel injection system comprising compensation element Download PDF

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Publication number
EP2176539B1
EP2176539B1 EP08774247A EP08774247A EP2176539B1 EP 2176539 B1 EP2176539 B1 EP 2176539B1 EP 08774247 A EP08774247 A EP 08774247A EP 08774247 A EP08774247 A EP 08774247A EP 2176539 B1 EP2176539 B1 EP 2176539B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
fuel
cylinder head
injection system
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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.)
Not-in-force
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EP08774247A
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German (de)
French (fr)
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EP2176539A1 (en
Inventor
Martin Scheffel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2176539A1 publication Critical patent/EP2176539A1/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
    • F02M61/14—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 present invention relates to a fuel injection system for directly injecting fuel into a combustion chamber of an internal combustion engine.
  • Fuel injection systems are known from the prior art in different configurations.
  • a fuel injection valve which has a compensation element for mounting the fuel injection valve in a cylinder head.
  • the compensating element has webs on a ring, which extend along a valve housing and at the end of which support segments are arranged.
  • the support segments are formed partially circular in shape to ensure a spacing between the fuel injection valve and the receiving bore in the cylinder head.
  • a fuel injection system for direct injection of fuels into at least one combustion chamber of an internal combustion engine comprises at least one fuel injection valve for each combustion chamber, which can be used in each case at an ejection section in an associated receiving bore formed on the cylinder head of the internal combustion engine and has a fuel inlet opening at an inlet section.
  • the fuel injection system further comprises a fuel distributor line which has, for each fuel injection valve, a fuel outlet opening which can be connected to the fuel inlet opening of the fuel injection valve in a connecting piece.
  • the fuel injection system is configured in such a way that a dome-shaped support surface is provided in the receiving bore between an upper and a lower sealing ring of the fuel injection valve, on which a support portion of the fuel injector used is supported so that the fuel injection valve in the receiving bore in a predetermined angular range fixed pivotally is.
  • the fuel injection system according to the invention for the direct injection of fuel into a combustion chamber of an internal combustion engine with the features of claim 1 has the advantage that it allows a floating storage of a fuel rail, such as a rail.
  • the fuel injection system is very simple and can be provided particularly cost.
  • the fuel injection system according to the invention can compensate for tolerances between the fuel rail, the cylinder head and the fuel injection valve and ensure optimum positioning of the fuel injection valve in a receiving bore of the cylinder head.
  • the injection system according to the invention comprises a compensation element for a position and / or tolerance compensation and a separate support element.
  • the support member is between the fuel injection valve and the cylinder head at a stage of
  • the support element ensures a support of the fuel injection valve in the axial direction of the fuel injection valve.
  • the compensation element is arranged in the axial direction of the fuel injection valve between a first sealing element and a second seal.
  • the first sealing element seals between the fuel injection valve and the cylinder head and the second seal seals between the fuel injection valve and the fuel rail.
  • the compensation element is a sleeve with an annular fixing region and elastic elements.
  • the sleeve is provided annularly and has a plurality of elastic elements on an annular fixing region.
  • the elastic elements are preferably designed as at least three radially outwardly projecting hooks or noses.
  • the compensation element is a shaft ring.
  • the wave ring has, for example, a sinusoidal course with projecting and recessed turning points, which are arranged around an imaginary circle to form the ring.
  • the compensation element comprises a disc element with a disc region and a directed into the receiving bore in the cylinder head collar.
  • the collar in this case has a predetermined elasticity and is in contact with the fuel injection valve, whereby the position and tolerance compensation is made possible.
  • the compensation element comprises a plurality of ribs, which are aligned in the axial direction of the fuel injection valve.
  • the ribs are arranged between the fuel injection valve and the cylinder head and have an elasticity to the To enable compensation function.
  • the ribs are molded onto the fuel injector film or to the receiving bore in the cylinder head.
  • the fins may be molded integrally with a housing member of the fuel injector.
  • the compensating element is made of an elastic plastic or a sheet metal material, in particular a spring plate.
  • the compensation element is preferably arranged as close as possible to the first sealing element.
  • the first sealing element and the compensating element are arranged directly adjacent, whereby a contact between the two components is possible.
  • the compensation element is arranged directly at the beginning of the receiving bore for the fuel injection valve in the cylinder head.
  • a fixation with play in the radial direction of the cylinder head is preferably on a fixing, such as a rail cup, which is provided on the cylinder head for fixing the fuel distribution line, a fixation with play in the radial direction of the cylinder head possible.
  • a fixing such as a rail cup
  • holes may be provided with a large diameter on the fixing, which allow the radial play.
  • the second sealing element is designed as a Teflon ring.
  • the Teflon ring can be safely used as a fulcrum for a tolerance compensation, without being damaged.
  • the fuel injection system according to the invention can be used both in gasoline engines and in diesel engines.
  • possibility of unfavorable addition of manufacturing tolerances or assembly tolerances can be compensated excellent by the fuel injection system according to the invention.
  • the fuel injection system 1 comprises a fuel injection valve 3, which injects fuel into a combustion chamber 2.
  • the fuel injection valve 3 is connected to a fuel distribution line 4, for example a rail.
  • the fuel rail 4 distributes a pressurized fuel, eg diesel, to the existing fuel injectors.
  • the fuel injection valve 3 is arranged in a cylinder head 5 in a receiving bore 6. Further, the fuel rail 4 is fixed to a manifold cup 11 by a screw 12 in a threaded bore 5a of the cylinder head 5. In this case, a game S1 is provided between the screw 12 and the distribution pipe cup 11.
  • the fuel injection system 1 comprises a first sealing element, a second sealing element 8, a compensation element 9 and a support ring 10.
  • the first sealing element 7 seals between the fuel injection valve 3 and the cylinder head 5 at an end of the fuel chamber 2 facing the combustion chamber 2. Injector 3 from.
  • the second Sealing member 8 seals between the fuel injection valve 3 and the fuel rail 4 at a directed to the fuel rail 4 end of the fuel injection valve 3 from.
  • the support ring 10 supports the fuel injection valve 3 in the axial direction XX of the fuel valve at a stage 6a of the receiving bore 6. In this case, a clearance S2 is present between the support ring 10 and the receiving bore 6.
  • the compensating element 9 is arranged on the fuel injection valve 3 in a region between the first sealing element 7 and the second sealing element 8, more precisely at a region between the supporting ring 10 and the second sealing element 8.
  • the compensating element 9 is made in detail FIG. 2 seen.
  • the balancing member 9 comprises an annular fixing portion 9a, with which the balancing member is fixed to the fuel injection valve 3, and a plurality of elastic members 9b formed integrally with the annular fixing portion 9a.
  • the elastic members 9b are three outwardly projecting hook members.
  • the elastic elements 9b are in contact with the receiving bore 6 and allow a resilient support of the fuel injection valve 3 in the radial direction.
  • the invention- ⁇ e component arrangement Due to the backlash S2 of the fuel injection valve 3 in the region of the support ring 10 and of the play S1 in the attachment of the manifold pipe 11 to the cylinder head 5, the fuel injection valve 3 can rotate about a pivot point D, which is located in the region of the first sealing element 7 , As a function of existing stresses, a deformation occurs on the elastic elements 9b of the compensating element 9.
  • the arrangement of the compensating element 9 in the fuel injection valve 3 tolerances can be compensated in all directions. It is preferred that the compensation element 9 is arranged as close to the edge of the receiving bore 6.
  • an upper surface of the compensating element 9 is flush with a surface of the cylinder head 5.
  • the support ring 10 also supports the fuel injection valve 3 in the axial direction XX, but also allows the rotation of the fuel injection valve 3 about the fulcrum due to the play S2 D for a position and tolerance compensation. Since separate sealing elements 7, 8 are used for sealing the fuel injection valve 2, the tightness at the fuel injection valve 3 can furthermore be ensured without problems.
  • the first sealing element 7 is preferably a Teflon ring with a predetermined height in the axial direction. According to the invention thus the fuel injection system can be brought in its mounted state in a neutral, force-free position, since a position and tolerance compensation is possible.
  • FIG. 3 a fuel injection system according to a second embodiment of the invention described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
  • a wave ring 20 is provided as a compensation element of the second embodiment.
  • the shaft ring has a sinusoidal, annular curve shape with support areas formed alternately radially outward and radially inward.
  • the other function corresponds to the compensation element 9 of the first embodiment, so that reference can be made to the description given there.
  • FIG. 4 shows a fuel injection system according to a third embodiment with a further alternative for a compensation element.
  • the compensating element of the third embodiment is a disc 30 having a disc portion 30a and a collar 31 formed integrally thereon.
  • the collar 31 is disposed centrally in the disc 30 and is fixed to the fuel injection valve 3, eg by means of clamps.
  • the disc 30 is placed on the surface of the cylinder head 5 and a connecting portion 32 protrudes partially into the receiving bore 6 in the cylinder head 5 inside.
  • This connection region 32 between the disc region 30a and the collar 31 enables the necessary compensation movements and therefore has a predetermined elasticity.
  • the compensating element of the third embodiment may be made of plastic or of a metallic material. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.
  • FIG. 5 shows a fuel injection system 1 according to a fourth embodiment of the present invention, wherein identical or functionally identical parts are denoted by the same reference numerals as in the preceding embodiments.
  • the fuel injection system of the fourth embodiment corresponds substantially to that of the first embodiment, wherein the compensation element for position and / or tolerance compensation is a rib assembly 40.
  • the fin assembly 40 includes a cylindrical base portion 41 and a plurality of fins 42.
  • the finned assembly 40 is secured to the fuel injector 3 such that the fins 42 face towards the fuel rail 4.
  • the ribs 42 have a certain elasticity.
  • a game S3 is provided between the ribs 42 and the receiving bore 6 in the cylinder head 5.
  • this game S3 one or more of the ribs 42 is not immediately deformed at a tolerance compensation, but first this game S3 must be overcome until one or more ribs 42 come into contact with the receiving bore 6 and then deformation and force absorption due to the tolerance differences occurs , Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The present invention relates to a fuel injection system for the direct injection of fuel into a combustion chamber of an internal combustion engine. At least one fuel injection valve is arranged on a cylinder head in a receiving bore in order to inject fuel into the combustion chamber. A fuel distribution line is provided for feeding the fuel to the fuel injection valve. A compensation element for a position compensation and/or tolerance compensation, is arranged in the radial direction between the fuel injection valve and the cylinder head and is arranged in the axial direction of the fuel injection valve between a first sealing element, sealing between the fuel injection valve and the cylinder head on a side facing the combustion chamber of the fuel injection valve, and a second sealing element, sealing between the fuel injection valve and the fuel distribution line. Further provided is a support ring, which is arranged between the fuel injection valve and the cylinder head and which provides support for the fuel injection valve in the axial direction on a step of the receiving bore and which has a clearance in the radial direction.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Brennstoff-Einspritzanlage zum direkten Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine.The present invention relates to a fuel injection system for directly injecting fuel into a combustion chamber of an internal combustion engine.

Brennstoff-Einspritzanlagen sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Beispielsweise ist aus der DE 101 40 797 A1 ein Brennstoff-Einspritzventil bekannt, welches ein Ausgleichselement zur Lagerung des Brennstoff-Einspritzventils in einem Zylinderkopf aufweist. Das Ausgleichselement weist an einem Ring Stege auf, welche sich entlang eines Ventilgehäuses erstrecken und an deren Ende Stützsegmente angeordnet sind. Die Stützsegmente sind dabei teilkreisförmig ausgebildet, um eine Beabstandung zwischen dem Brennstoff-Einspritzventil und der Aufnahmebohrung im Zylinderkopf sicherzustellen.Fuel injection systems are known from the prior art in different configurations. For example, is from the DE 101 40 797 A1 a fuel injection valve is known, which has a compensation element for mounting the fuel injection valve in a cylinder head. The compensating element has webs on a ring, which extend along a valve housing and at the end of which support segments are arranged. The support segments are formed partially circular in shape to ensure a spacing between the fuel injection valve and the receiving bore in the cylinder head.

Aus der DE 197 35 665 A1 ist bereits eine Brennstoffeinspritzanlage zum direkten Einspritzen von Brennstoffen in zumindest einen Brennraum einer Brennkraftmaschine bekannt. Die Brennstofreinspritzanlage umfasst zumindest ein Brennstoffeinspritzventil für jeden Brennraum, das jeweils an einem Abspritzabschnitt in eine zugeordnete, an dem Zylinderkopf der Brennkraftmaschine ausgebildete Aufnahmebohrung einsetzbar ist und an einem Zulaufabschnitt eine Brennstoffeinlassöffnung aufweist. Die Brennstoffeinspritzanlage umfasst ferner eine Brennstoffverteilerleitung, die für jedes Brennstoffeinspritzventil eine mit der Brennstoffeinlassöffnung des Brennstoffeinspritzventils verbindbare Brennstoffauslassöffnung in einem Anschlussstutzen aufweist. Die Brennstoffeinspritzanlage ist in der Weise ausgestaltet, dass zwischen einem oberen und einem unteren Dichtring des Brennstoffeinspritzventils eine kalottenförmige Stützfläche in der Aufnahmebohrung vorgesehen ist, auf welcher sich ein Stützabschnitt des eingesetzten Brennstoffeinspritzventils so abstützt, dass das Brennstoffeinspritzventil in der Aufnahmebohrung in einem vorgegebenen Winkelbereich schwenkbar fixiert ist.From the DE 197 35 665 A1 A fuel injection system for direct injection of fuels into at least one combustion chamber of an internal combustion engine is already known. The fuel injection system comprises at least one fuel injection valve for each combustion chamber, which can be used in each case at an ejection section in an associated receiving bore formed on the cylinder head of the internal combustion engine and has a fuel inlet opening at an inlet section. The fuel injection system further comprises a fuel distributor line which has, for each fuel injection valve, a fuel outlet opening which can be connected to the fuel inlet opening of the fuel injection valve in a connecting piece. The fuel injection system is configured in such a way that a dome-shaped support surface is provided in the receiving bore between an upper and a lower sealing ring of the fuel injection valve, on which a support portion of the fuel injector used is supported so that the fuel injection valve in the receiving bore in a predetermined angular range fixed pivotally is.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Brennstoff-Einspritzanlage zum direkten Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass es eine schwimmende Lagerung einer Brennstoff-Verteilerleitung, wie beispielsweise einem Rail, ermöglicht. Dabei ist die Brennstoff-Einspritzanlage sehr einfach aufgebaut und kann besonders kostengünstig bereitgestellt werden. Insbesondere kann die erfindungsgemäße Brennstoff-Einspritzanlage Toleranzen zwischen der Brennstoff-Verteilerleitung, dem Zylinderkopf und dem Brennstoff-Einspritzventil ausgleichen und eine optimale Positionierung des Brennstoff-Einspritzventils in einer Aufnahmebohrung des Zylinderkopfs sicherstellen. Die erfindungsgemäße Einspritzanlage umfasst ein Ausgleichselement für einen Positions- und/oder Toleranzausgleich und ein separates Abstützelement. Das Abstützelement ist dabei zwischen dem Brennstoff-Einspritzventil und dem Zylinderkopf an einer Stufe derThe fuel injection system according to the invention for the direct injection of fuel into a combustion chamber of an internal combustion engine with the features of claim 1 has the advantage that it allows a floating storage of a fuel rail, such as a rail. The fuel injection system is very simple and can be provided particularly cost. In particular, the fuel injection system according to the invention can compensate for tolerances between the fuel rail, the cylinder head and the fuel injection valve and ensure optimum positioning of the fuel injection valve in a receiving bore of the cylinder head. The injection system according to the invention comprises a compensation element for a position and / or tolerance compensation and a separate support element. The support member is between the fuel injection valve and the cylinder head at a stage of

Aufnahmebohrung angeordnet und weist in Radialrichtung ein Spiel auf. Das Abstützelement stellt eine Abstützung des Brennstoff-Einspritzventils in Axialrichtung des Brennstoff-Einspritzventils sicher. Das Ausgleichselement ist in Axialrichtung des Brennstoff-Einspritzventils zwischen einem ersten Dichtelement und einer zweiten Dichtung angeordnet. Das erste Dichtelement dichtet dabei zwischen dem Brennstoff-Einspritzventil und dem Zylinderkopf ab und die zweite Dichtung dichtet zwischen dem Brennstoff-Einspritzventil und der Brennstoff-Verteilerleitung ab. Durch die erfindungsgemäße Kombination des Ausgleichselement mit dem separaten Stützelement mit Radialspiel kann somit ein sicherer Toleranzausgleich ermöglicht werden, wobei bei einem Ausgleichsvorgang als Drehpunkt die zweite Dichtung vorgesehen ist. Dies ist aufgrund des Radialspiels des Abstützelements möglich. Ferner sei angemerkt, dass selbstverständlich auch mehrere Brennstoff-Einspritzventile vorgesehen sein können und die Brennkraftmaschine auch mehrere Zylinder umfassen kann.Arranged receiving bore and has a clearance in the radial direction. The support element ensures a support of the fuel injection valve in the axial direction of the fuel injection valve. The compensation element is arranged in the axial direction of the fuel injection valve between a first sealing element and a second seal. The first sealing element seals between the fuel injection valve and the cylinder head and the second seal seals between the fuel injection valve and the fuel rail. The inventive combination of the compensating element with the separate support member with radial clearance thus a safe tolerance compensation can be made possible, wherein in a balancing process as a fulcrum, the second seal is provided. This is possible due to the radial clearance of the support element. It should also be noted that, of course, a plurality of fuel injection valves may be provided and the internal combustion engine may also comprise a plurality of cylinders.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Vorzugsweise ist das Ausgleichselement eine Manschette mit einem ringförmigen Fixierbereich und elastischen Elementen. Die Manschette ist dabei ringförmig vorgesehen und weist an einem ringförmigen Fixierbereich mehrere elastische Elemente auf. Die elastischen Elemente sind vorzugsweise als wenigstens drei radial nach außen vorstehende Haken oder Nasen ausgebildet.Preferably, the compensation element is a sleeve with an annular fixing region and elastic elements. The sleeve is provided annularly and has a plurality of elastic elements on an annular fixing region. The elastic elements are preferably designed as at least three radially outwardly projecting hooks or noses.

Gemäß einer alternativen Ausgestaltung der vorliegenden Erfindung ist das Ausgleichselement ein Wellenring. Der Wellenring weist dabei beispielsweise einen sinusähnlichen Verlauf mit vorspringenden und zurückgesetzten Wendepunkten auf, welche um einen imaginären Kreis angeordnet sind, um den Ring zu bilden.According to an alternative embodiment of the present invention, the compensation element is a shaft ring. The wave ring has, for example, a sinusoidal course with projecting and recessed turning points, which are arranged around an imaginary circle to form the ring.

Gemäß einer anderen bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst das Ausgleichselement ein Scheibenelement mit einem Scheibenbereich und einem in die Aufnahmebohrung im Zylinderkopf gerichteten Kragen. Der Kragen weist dabei eine vorbestimmte Elastizität auf und ist mit dem Brennstoff-Einspritzventil in Kontakt, wodurch der Positions- und Toleranzausgleich ermöglicht wird.According to another preferred embodiment of the present invention, the compensation element comprises a disc element with a disc region and a directed into the receiving bore in the cylinder head collar. The collar in this case has a predetermined elasticity and is in contact with the fuel injection valve, whereby the position and tolerance compensation is made possible.

Gemäß einer noch anderen bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst das Ausgleichselement eine Vielzahl von Rippen, die in Axialrichtung des Brennstoff-Einspritzventils ausgerichtet sind. Die Rippen sind zwischen dem Brennstoff-Einspritzventil und dem Zylinderkopf angeordnet und weisen eine Elastizität auf, um die Ausgleichsfunktion zu ermöglichen. Vorzugsweise sind die Rippen dabei am Brennstoff-Einspritzvenfil oder an der Aufnahmebohrung im Zylinderkopf angespritzt.According to yet another preferred embodiment of the present invention, the compensation element comprises a plurality of ribs, which are aligned in the axial direction of the fuel injection valve. The ribs are arranged between the fuel injection valve and the cylinder head and have an elasticity to the To enable compensation function. Preferably, the ribs are molded onto the fuel injector film or to the receiving bore in the cylinder head.

Die Rippen können beispielsweise einstückig mit einem Gehäusebauteil des Brennstoff-Einspritzventils gespritzt werden.For example, the fins may be molded integrally with a housing member of the fuel injector.

Vorzugsweise ist das Ausgleichselement aus einem elastischen Kunststoff oder einem Blechmaterial, insbesondere einem Federblech, hergestellt.Preferably, the compensating element is made of an elastic plastic or a sheet metal material, in particular a spring plate.

Um eine möglichst große Fähigkeit eines Toleranzausgleichs sicherzustellen, ist das Ausgleichselement vorzugsweise möglichst nah am ersten Dichtelement angeordnet. Besonders bevorzugt sind das erste Dichtelement und das Ausgleichselement dabei unmittelbar benachbart angeordnet, wobei auch eine Berührung zwischen den beiden Bauteilen möglich ist. Besonders bevorzugt ist das Ausgleichselement dabei unmittelbar am Anfang der Aufnahmebohrung für das Brennstoff-Einspritzventil im Zylinderkopf angeordnet.In order to ensure the greatest possible ability of tolerance compensation, the compensation element is preferably arranged as close as possible to the first sealing element. Particularly preferably, the first sealing element and the compensating element are arranged directly adjacent, whereby a contact between the two components is possible. Particularly preferably, the compensation element is arranged directly at the beginning of the receiving bore for the fuel injection valve in the cylinder head.

Für einen besonders großen Toleranzausgleich ist vorzugsweise an einem Fixierelement, wie beispielsweise einer Rail-Tasse, welche am Zylinderkopf zur Fixierung der Brennstoff-Verteilerleitung vorgesehen ist, eine Fixierung mit Spiel in Radialrichtung am Zylinderkopf möglich. Hierzu können am Fixierelement beispielsweise Bohrungen mit einem großen Durchmesser vorgesehen sein, welche das Radialspiel ermöglichen.For a particularly large tolerance compensation is preferably on a fixing, such as a rail cup, which is provided on the cylinder head for fixing the fuel distribution line, a fixation with play in the radial direction of the cylinder head possible. For this purpose, for example, holes may be provided with a large diameter on the fixing, which allow the radial play.

Besonders bevorzugt ist das zweite Dichtelement als Teflon-Ring ausgebildet. Dadurch kann einerseits die Abdichtfunktion zwischen dem Brennstoff-Einspritzventil und der Aufnahmebohrung im Zylinderkopf sichergestellt werden und andererseits kann der Teflon-ring sicher als Drehpunkt für einen Toleranzausgleich verwendet werden, ohne beschädigt zu werden.Particularly preferably, the second sealing element is designed as a Teflon ring. As a result, on the one hand the sealing function between the fuel injection valve and the receiving bore in the cylinder head can be ensured and on the other hand, the Teflon ring can be safely used as a fulcrum for a tolerance compensation, without being damaged.

Die erfindungsgemäße Brennstoff-Einspritzanlage kann sowohl in Otto-Motoren als auch in Dieselmotoren verwendet werden. Insbesondere die bei mehrzylindrigen Motoren gegebene Möglichkeit einer ungünstigen Addition von fertigungsbedingten Toleranzen oder Montagetoleranzen kann durch die erfindungsgemäße Brennstoff-Einspritzanlage hervorragend ausgeglichen werden.The fuel injection system according to the invention can be used both in gasoline engines and in diesel engines. In particular, given in multi-cylinder engines possibility of unfavorable addition of manufacturing tolerances or assembly tolerances can be compensated excellent by the fuel injection system according to the invention.

Zeichnungdrawing

Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine schematische Schnittansicht einer Brennstoff-Einspritzanlage gemäß einem ersten Ausführungsbeispiel der Erfindung,
Figur 2
eine schematische Schnittansicht entlang der Linie II-II von Figur 1 mit einer Draufsicht auf ein Ausgleichselement des ersten Ausführungsbeispiels,
Figur 3
eine schematische Draufsicht eines Ausgleichselements gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung,
Figur 4
eine schematische Schnittansicht eines Ausgleichselements gemäß einem dritten Ausführungsbeispiel der vorliegenden Erfindung, und
Figur 5
eine schematische Schnittansicht einer Brennstoff-Einspritzanlage gemäß einem vierten Ausführungsbeispiel der vorliegenden Erfindung.
Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
FIG. 1
a schematic sectional view of a fuel injection system according to a first embodiment of the invention,
FIG. 2
a schematic sectional view taken along the line II-II of FIG. 1 with a plan view of a compensating element of the first embodiment,
FIG. 3
a schematic plan view of a compensating element according to a second embodiment of the present invention,
FIG. 4
a schematic sectional view of a compensating element according to a third embodiment of the present invention, and
FIG. 5
a schematic sectional view of a fuel injection system according to a fourth embodiment of the present invention.

Bevorzugte Ausführungsformen der ErfindungPreferred embodiments of the invention

Nachfolgend wird unter Bezugnahme auf die Figuren 1 und 2 eine Brennstoff-Einspritzanlage 1 gemäß einem ersten Ausführungsbeispiel der Erfindung beschrieben. Wie aus Figur 1 ersichtlich ist, umfasst die Brennstoff-Einspritzanlage 1 ein Brennstoff-Einspritzventil 3, welches Brennstoff in einen Brennraum 2 einspritzt. Das Brennstoff-Einspritzventil 3 ist mit einer Brennstoff-Verteilerleitung 4, beispielsweise einem Rail, verbunden. Die Brennstoff-Verteilerleitung 4 verteilt einen unter Druck stehenden Brennstoff, z.B. Diesel, zu den vorhandenen Brennstoff-Einspritzventilen. Das Brennstoff-Einspritzventil 3 ist in einem Zylinderkopf 5 in einer Aufnahmebohrung 6 angeordnet. Ferner wird die Brennstoff-Verteilerleitung 4 an einer Verteilerleitungstasse 11 mittels einer Schraube 12 in einer Gewindebohrung 5a des Zylinderkopfes 5 befestigt. Dabei ist zwischen der Schraube 12 und der Verteilerleitungstasse 11 ein Spiel S1 vorgesehen.The following is with reference to the FIGS. 1 and 2 a fuel injection system 1 according to a first embodiment of the invention described. How out FIG. 1 it can be seen, the fuel injection system 1 comprises a fuel injection valve 3, which injects fuel into a combustion chamber 2. The fuel injection valve 3 is connected to a fuel distribution line 4, for example a rail. The fuel rail 4 distributes a pressurized fuel, eg diesel, to the existing fuel injectors. The fuel injection valve 3 is arranged in a cylinder head 5 in a receiving bore 6. Further, the fuel rail 4 is fixed to a manifold cup 11 by a screw 12 in a threaded bore 5a of the cylinder head 5. In this case, a game S1 is provided between the screw 12 and the distribution pipe cup 11.

Ferner umfasst die Brennstoff-Einspritzanlage 1 ein erstes Dichtelement, ein zweites Dichtelement 8, ein Ausgleichselement 9 und einen Abstützring 10. Das erste Dichtelement 7 dichtet dabei zwischen dem Brennstoff-Einspritzventil 3 und dem Zylinderkopf 5 an einem zum Brennraum 2 gerichteten Ende des Brennstoff-Einspritzventils 3 ab. Das zweite Dichtelement 8 dichtet zwischen dem Brennstoff-Einspritzventil 3 und der Brennstoff-Verteilerleitung 4 an einem zur Brennstoff-Verteilerleitung 4 gerichteten Ende des Brennstoff-Einspritzventils 3 ab. Der Abstützring 10 stützt das Brennstoff-Einspritzventil 3 in Axialrichtung X-X des Brennstoff-Ventils an einer Stufe 6a der Aufnahmebohrung 6 ab. Dabei ist zwischen dem Abstützring 10 und der Aufnahmebohrung 6 ein Spiel S2 vorhanden. Das Ausgleichselement 9 ist am Brennstoff-Einspritzventil 3 in einem Bereich zwischen dem ersten Dichtelement 7 und dem zweiten Dichtelement 8, genauer an einem Bereich zwischen dem Abstützring 10 und dem zweiten Dichtelement 8 angeordnet.Furthermore, the fuel injection system 1 comprises a first sealing element, a second sealing element 8, a compensation element 9 and a support ring 10. The first sealing element 7 seals between the fuel injection valve 3 and the cylinder head 5 at an end of the fuel chamber 2 facing the combustion chamber 2. Injector 3 from. The second Sealing member 8 seals between the fuel injection valve 3 and the fuel rail 4 at a directed to the fuel rail 4 end of the fuel injection valve 3 from. The support ring 10 supports the fuel injection valve 3 in the axial direction XX of the fuel valve at a stage 6a of the receiving bore 6. In this case, a clearance S2 is present between the support ring 10 and the receiving bore 6. The compensating element 9 is arranged on the fuel injection valve 3 in a region between the first sealing element 7 and the second sealing element 8, more precisely at a region between the supporting ring 10 and the second sealing element 8.

Das Ausgleichselement 9 ist im Detail aus Figur 2 ersichtlich. Wie in Figur 2 gezeigt, umfasst das Ausgleichselement 9 einen ringförmigen Fixierbereich 9a, mit welchem das Ausgleichselement an dem Brennstoff-Einspritzventil 3 befestigt ist, und mehrere elastische Elemente 9b, welche einstückig mit dem ringförmigen Fixierbereich 9a gebildet sind. In diesem Ausführungsbeispiel sind die elastischen Elemente 9b drei nach außen vorstehende Hakenelemente. Die elastischen Elemente 9b befinden sich mit der Aufnahmebohrung 6 in Kontakt und ermöglichen eine federnde Abstützung des Brennstoff-Einspritzventils 3 in Radialrichtung.The compensating element 9 is made in detail FIG. 2 seen. As in FIG. 2 As shown, the balancing member 9 comprises an annular fixing portion 9a, with which the balancing member is fixed to the fuel injection valve 3, and a plurality of elastic members 9b formed integrally with the annular fixing portion 9a. In this embodiment, the elastic members 9b are three outwardly projecting hook members. The elastic elements 9b are in contact with the receiving bore 6 and allow a resilient support of the fuel injection valve 3 in the radial direction.

Wenn aufgrund von herstellungsbedingten Toleranzen oder aufgrund von Montagetoleranzen der verschiedenen einzelnen Bauteile der Brennstoff-Einspritzanlage 1 im montierten Zustand eine Spannung entstehen würde, kann diese nun durch die erfindungsgemä-βe Bauteile-Anordnung ausgeglichen werden. Aufgrund des Spiels S2 des Brennstoff-Einspritzventils 3 im Bereich des Abstützrings 10 sowie des Spiels S1 bei der Befestigung der Verteilerleitungstasse 11 am Zylinderkopf 5 kann das Brennstoff-Einspritzventil 3 sich um einen Drehpunkt D, welcher sich im Bereich des ersten Dichtelements 7 befindet, drehen. Dabei tritt in Abhängigkeit von vorhandenen Spannungen eine Verformung an den elastischen Elementen 9b des Ausgleichselements 9 auf. Durch die Anordnung des Ausgleichselements 9 beim Brennstoff-Einspritzventil 3 können dabei Toleranzen in allen Richtungen ausgeglichen werden. Dabei ist es bevorzugt, dass das Ausgleichselement 9 möglichst nahe am Rand der Aufnahmebohrung 6 angeordnet ist. Besonders bevorzugt ist eine obere Fläche des Ausgleichselements 9 dabei bündig mit einer Oberfläche des Zylinderkopfs 5. Der Abstützring 10 stützt ferner das Brennstoff-Einspritzventil 3 in Axialrichtung X-X ab, ermöglicht aber aufgrund des Spiels S2 ebenfalls die Drehung des Brennstoff-Einspritzventils 3 um den Drehpunkt D für einen Positions- und Toleranzausgleich. Da für die Abdichtung des Brennstoff-Einspritzventils 2 separate Dichtelemente 7, 8 verwendet werden, kann weiterhin problemlos die Dichtigkeit am Brennstoff-Einspritzventil 3 sichergestellt werden. Um möglichst hohe Lasten aufnehmen zu können, ist das erste Dichtelement 7 vorzugsweise ein Teflonring mit einer vorbestimmten Höhe in Axialrichtung. Erfindungsgemäß kann somit die Brennstoff-Einspritzanlage in ihrem montierten Zustand in eine neutrale, kraftfreie Position gebracht werden, da ein Positions- und Toleranzausgleich möglich ist. Dadurch können insbesondere auch in Axialrichtung X-X lange Einspritzventile verbaut werden, welche aufgrund ihres Hebelarms häufig eine hohe Kraft auf die Brennstoff-Verteilerleitung ausüben. Der separate Abstützring 10 stellt dabei immer eine Abstützung des Brennstoff-Einspritzventils 3 am Zylinderkopf 5 in Axialrichtung X-X sicher.If, due to manufacturing tolerances or due to assembly tolerances of the various individual components of the fuel injection system 1 in the mounted state, a voltage would arise, this can now be compensated by the invention-βe component arrangement. Due to the backlash S2 of the fuel injection valve 3 in the region of the support ring 10 and of the play S1 in the attachment of the manifold pipe 11 to the cylinder head 5, the fuel injection valve 3 can rotate about a pivot point D, which is located in the region of the first sealing element 7 , As a function of existing stresses, a deformation occurs on the elastic elements 9b of the compensating element 9. The arrangement of the compensating element 9 in the fuel injection valve 3 tolerances can be compensated in all directions. It is preferred that the compensation element 9 is arranged as close to the edge of the receiving bore 6. Particularly preferably, an upper surface of the compensating element 9 is flush with a surface of the cylinder head 5. The support ring 10 also supports the fuel injection valve 3 in the axial direction XX, but also allows the rotation of the fuel injection valve 3 about the fulcrum due to the play S2 D for a position and tolerance compensation. Since separate sealing elements 7, 8 are used for sealing the fuel injection valve 2, the tightness at the fuel injection valve 3 can furthermore be ensured without problems. To be able to absorb the highest possible loads, the first sealing element 7 is preferably a Teflon ring with a predetermined height in the axial direction. According to the invention thus the fuel injection system can be brought in its mounted state in a neutral, force-free position, since a position and tolerance compensation is possible. As a result, in particular in the axial direction XX long injection valves can be installed, which often exert a high force on the fuel rail due to their lever arm. The separate support ring 10 always ensures a support of the fuel injection valve 3 on the cylinder head 5 in the axial direction XX safe.

Nachfolgend wird unter Bezugnahme auf Figur 3 eine Brennstoff-Einspritzanlage gemäß einem zweiten Ausführungsbeispiel der Erfindung im Detail beschrieben. Gleiche bzw. funktional gleiche Teile sind mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet.The following is with reference to FIG. 3 a fuel injection system according to a second embodiment of the invention described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.

Der Unterschied der Brennstoff-Einspritzanlage des zweiten Ausführungsbeispiels gegenüber der des ersten Ausführungsbeispiels liegt in einem unterschiedlichen Ausgleichselement. Wie aus Figur 3 ersichtlich ist, ist als Ausgleichselement des zweiten Ausführungsbeispiels ein Wellenring 20 vorgesehen. Der Wellenring weist eine sinusartige, ringförmige Kurvenform auf mit abwechselnd radial nach außen und radial nach innen gebildeten Abstützbereichen. Dadurch stützt sich der Wellenring 20 zwischen dem Brennstoff-Einspritzventil 3 und der Aufnahmebohrung 6 im Zylinderkopf 5 ab. Die sonstige Funktion entspricht dabei dem Ausgleichselement 9 des ersten Ausführungsbeispiels, so dass auf die dort gegebene Beschreibung verwiesen werden kann.The difference of the fuel injection system of the second embodiment from that of the first embodiment lies in a different compensation element. How out FIG. 3 it can be seen, a wave ring 20 is provided as a compensation element of the second embodiment. The shaft ring has a sinusoidal, annular curve shape with support areas formed alternately radially outward and radially inward. As a result, the shaft ring 20 is supported between the fuel injection valve 3 and the receiving bore 6 in the cylinder head 5. The other function corresponds to the compensation element 9 of the first embodiment, so that reference can be made to the description given there.

Figur 4 zeigt eine Brennstoff-Einspritzanlage gemäß einem dritten Ausführungsbeispiel mit einer weiteren Alternative für ein Ausgleichselement. Das Ausgleichselement des dritten Ausführungsbeispiels ist dabei eine Scheibe 30 mit einem Scheibenbereich 30a und einem einstückig daran gebildeten Kragen 31. Der Kragen 31 ist mittig in der Scheibe 30 angeordnet und ist am Brennstoff-Einspritzventil 3 befestigt, z.B. mittels Klemmen. Die Scheibe 30 ist an der Oberfläche des Zylinderkopfs 5 aufgelegt und ein Verbindungsbereich 32 ragt teilweise in die Aufnahmebohrung 6 im Zylinderkopf 5 hinein. Dieser Verbindungsbereich 32 zwischen dem Scheibenbereich 30a und dem Kragen 31 ermöglicht die notwendigen Ausgleichsbewegungen und weist daher eine vorbestimmte Elastizität auf. Das Ausgleichselement des dritten Ausführungsbeispiels kann aus Kunststoff oder aus einem metallischen Material hergestellt sein. Ansonsten entspricht dieses Ausführungsbeispiel den vorhergehenden Ausführungsbeispielen, so dass auf die dort gegebene Beschreibung verwiesen werden kann. FIG. 4 shows a fuel injection system according to a third embodiment with a further alternative for a compensation element. The compensating element of the third embodiment is a disc 30 having a disc portion 30a and a collar 31 formed integrally thereon. The collar 31 is disposed centrally in the disc 30 and is fixed to the fuel injection valve 3, eg by means of clamps. The disc 30 is placed on the surface of the cylinder head 5 and a connecting portion 32 protrudes partially into the receiving bore 6 in the cylinder head 5 inside. This connection region 32 between the disc region 30a and the collar 31 enables the necessary compensation movements and therefore has a predetermined elasticity. The compensating element of the third embodiment may be made of plastic or of a metallic material. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.

Figur 5 zeigt eine Brennstoff-Einspritzanlage 1 gemäß einem vierten Ausführungsbeispiel der vorliegenden Erfindung, wobei gleiche bzw. funktional gleiche Teile mit den gleichen Bezugszeichen wie in den vorhergehenden Ausführungsbeispielen bezeichnet sind. FIG. 5 shows a fuel injection system 1 according to a fourth embodiment of the present invention, wherein identical or functionally identical parts are denoted by the same reference numerals as in the preceding embodiments.

Wie aus Figur 5 ersichtlich ist, entspricht die Brennstoff-Einspritzanlage des vierten Ausführungsbeispiels im Wesentlichen der des ersten Ausführungsbeispiels, wobei das Ausgleichselement zum Positions- und/oder Toleranzausgleich eine Rippenanordnung 40 ist. Die Rippenanordnung 40 umfasst einen zylinderförmigen Basisbereich 41 sowie eine Vielzahl von Rippen 42. Die Rippenanordnung 40 ist dabei derart am Brennstoff-Einspritzventil 3 befestigt, dass die Rippen 42 in Richtung der Brennstoff-Verteilerleitung 4 zeigen. Dabei weisen die Rippen 42 eine gewisse Elastizität auf. Wie aus Figur 5 ersichtlich ist, ist zwischen den Rippen 42 und der Aufnahmebohrung 6 im Zylinderkopf 5 ein Spiel S3 vorgesehen. Durch dieses Spiel S3 wird bei einem Toleranzausgleich nicht sofort eine oder mehrere der Rippen 42 verformt, sondern zuerst muss dieses Spiel S3 überwunden werden, bis eine oder mehrere Rippen 42 mit der Aufnahmebohrung 6 in Kontakt kommen und anschließend eine Verformung und Kraftaufnahme aufgrund der Toleranzunterschiede auftritt. Ansonsten entspricht dieses Ausführungsbeispiel den vorhergehenden Ausführungsbeispielen, so dass auf die dort gegebene Beschreibung verwiesen werden kann.How out FIG. 5 can be seen, the fuel injection system of the fourth embodiment corresponds substantially to that of the first embodiment, wherein the compensation element for position and / or tolerance compensation is a rib assembly 40. The fin assembly 40 includes a cylindrical base portion 41 and a plurality of fins 42. The finned assembly 40 is secured to the fuel injector 3 such that the fins 42 face towards the fuel rail 4. In this case, the ribs 42 have a certain elasticity. How out FIG. 5 it can be seen, a game S3 is provided between the ribs 42 and the receiving bore 6 in the cylinder head 5. By this game S3, one or more of the ribs 42 is not immediately deformed at a tolerance compensation, but first this game S3 must be overcome until one or more ribs 42 come into contact with the receiving bore 6 and then deformation and force absorption due to the tolerance differences occurs , Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.

Claims (11)

  1. Fuel injection system for directly injecting fuel into a combustion chamber (2) of an internal combustion engine, comprising
    - at least one fuel injection valve (3) which is arranged on a cylinder head (5) in a receiving bore (6) so as to inject fuel into the combustion chamber (2),
    - a fuel distributor line (4) for supplying the fuel to the fuel injection valve (3),
    - a compensating element (9; 20; 30; 40) for position compensation and/or tolerance compensation, which compensating element is arranged in the radial direction between the fuel injection valve (3) and the cylinder head (5), and which compensating element is arranged in the axial direction (X-X) of the fuel injection valve (3) between a first sealing element (7), which seals off between the fuel injection valve (2) and the cylinder head (5) at a side of the fuel injection valve facing the combustion chamber, and a second sealing element (8), which seals off between the fuel injection valve (3) and the fuel distributor line (4), and
    - a support ring (10) which is arranged between the fuel injection valve (3) and the cylinder head (5) and which supports the fuel injection valve (3) in the axial direction (X-X) on a step (6a) of the receiving bore (6) and which has play (S2) in the radial direction.
  2. Fuel injection system according to Claim 1, characterized in that the compensating element comprises a sleeve with an annular fixing region (9a) and a plurality of elastic elements (9b).
  3. Fuel injection system according to Claim 2, characterized in that the elastic elements (9b) are formed as at least three radially outwardly protruding hooks or lugs.
  4. Fuel injection system according to Claim 1, characterized in that the compensating element comprises a corrugated ring (20).
  5. Fuel injection system according to Claim 1, characterized in that the compensating element comprises a disc element (30) with a disc region (30a) and with a collar (31) arranged in the receiving bore (6) in the cylinder head, wherein the collar (31) is connected via a connecting region (32) to the disc region (30a) of the disc element, and the connecting region (32) has a predetermined elasticity.
  6. Fuel injection system according to Claim 1, characterized in that the compensating element has a rib arrangement (40) with a multiplicity of elastic ribs (42) in the axial direction (X-X) of the fuel injection valve (3), wherein the ribs (42) are arranged between the fuel injection valve (3) and the cylinder head (5).
  7. Fuel injection system according to Claim 6, characterized in that the ribs are injection-moulded onto the fuel injection valve (3) and/or onto the receiving bore (6).
  8. Fuel injection system according to one of the preceding claims, characterized in that the compensating element is produced from plastic or from a sheet-metal material, in particular a spring steel sheet.
  9. Fuel injection system according to one of the preceding claims, characterized in that the compensating element (9) is arranged directly at the start of the receiving bore (6).
  10. Fuel injection system according to one of the preceding claims, further comprising a fixing element, in particular a distributor line cup, for fastening the fuel distributor line (4) to the cylinder head (5) with play (S1).
  11. Fuel injection valve according to one of the preceding claims, characterized in that the first sealing element (7) is a Teflon ring.
EP08774247A 2007-07-30 2008-06-24 Fuel injection system comprising compensation element Not-in-force EP2176539B1 (en)

Applications Claiming Priority (2)

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DE102007035714A DE102007035714A1 (en) 2007-07-30 2007-07-30 Fuel injection system with compensation element
PCT/EP2008/057996 WO2009015948A1 (en) 2007-07-30 2008-06-24 Fuel injection system comprising compensation element

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EP2176539A1 EP2176539A1 (en) 2010-04-21
EP2176539B1 true EP2176539B1 (en) 2012-04-18

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US (1) US8353272B2 (en)
EP (1) EP2176539B1 (en)
JP (1) JP5200104B2 (en)
CN (1) CN101784787B (en)
AT (1) ATE554284T1 (en)
DE (1) DE102007035714A1 (en)
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WO (1) WO2009015948A1 (en)

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CN101784787A (en) 2010-07-21
EP2176539A1 (en) 2010-04-21
WO2009015948A1 (en) 2009-02-05
JP2010534789A (en) 2010-11-11
DE102007035714A1 (en) 2009-02-05
US20100186717A1 (en) 2010-07-29
ES2381610T3 (en) 2012-05-29
ATE554284T1 (en) 2012-05-15
CN101784787B (en) 2012-09-26
US8353272B2 (en) 2013-01-15
JP5200104B2 (en) 2013-05-15

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