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EP2153055A1 - Internal combustion engine with sealing protection for a fuel injection valve - Google Patents

Internal combustion engine with sealing protection for a fuel injection valve

Info

Publication number
EP2153055A1
EP2153055A1 EP08736639A EP08736639A EP2153055A1 EP 2153055 A1 EP2153055 A1 EP 2153055A1 EP 08736639 A EP08736639 A EP 08736639A EP 08736639 A EP08736639 A EP 08736639A EP 2153055 A1 EP2153055 A1 EP 2153055A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
injection valve
fuel injection
sealing element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08736639A
Other languages
German (de)
French (fr)
Other versions
EP2153055B1 (en
Inventor
Klaus Jung
Martin Scheffel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2153055A1 publication Critical patent/EP2153055A1/en
Application granted granted Critical
Publication of EP2153055B1 publication Critical patent/EP2153055B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals

Definitions

  • the present invention relates to an internal combustion engine with a seal protection for a gasket of a fuel injection valve.
  • Internal combustion engines are known from the prior art in different configurations.
  • internal combustion engines which inject a fuel by means of a fuel injection valve directly into a combustion chamber.
  • the fuel injection valve is arranged in a cylinder head and injects the fuel directly into the combustion chamber.
  • an annular seal such as a Teflon ring is used for sealing between the fuel injection valve and the cylinder head in this case. Since very high temperatures prevail in the combustion chamber during operation and the sealing ring between the fuel injection valve and the cylinder head is arranged relatively close to the combustion chamber, in particular negative thermal effects can act on the sealing ring.
  • DE 10 2005 019 313 A1 discloses a fuel injection valve I, in which a slotted shielding ring is arranged on the fuel injection valve.
  • the shielding ring is arranged between the seal and the combustion chamber and has a rectangular cross-section. In this way, however, no complete shielding of the sealing element can be ensured, since due to the slot and the rectangular cross-section no complete protection of the sealing element is possible.
  • the internal combustion engine according to the invention with the features of claim 1 has the advantage over that it provides excellent shielding for a arranged between a fuel injection valve and a cylinder head sealing element, so that the sealing element has a very long life.
  • the shield is arranged in the axial direction of the fuel injection valve between the sealing element and a combustion chamber of the internal combustion engine.
  • the shield has a ring shape, which in addition has a round cross section or a radially outwardly rounded cross-section.
  • the use of the round or rounded cross-section of the shielding ring makes it possible for the shielding ring to sit firmly between the cylinder head wall and an outer housing wall of the fuel injection valve.
  • the shielding ring is made of wire.
  • the shielding can be provided particularly simple and inexpensive.
  • a shield made of wire can also be easily mounted.
  • the shield is made of a high temperature resistant material, in particular an adhesion temperature resistant plastic.
  • the shielding ring is preferably arranged in a groove formed in the fuel injection valve.
  • the cylinder head wall can be very easily, e.g. as a cylindrical bore, be formed.
  • the sealing element is arranged in a first groove formed in the fuel injection valve, and the shielding ring is arranged in a second groove formed in the fuel injection valve I.
  • the shielding ring and the sealing element are arranged in a common groove in the fuel injection valve and spaced from each other. This makes it possible that only one groove for receiving the shielding ring and the sealing element in the fuel injection valve is necessary.
  • the shielding ring particularly preferably has a closed ring shape. This can be achieved, for example, by a joining operation of the free ends of the shielding ring, e.g. by welding or gluing done. As a result, in particular problems are avoided at a gap between the fuel injection valve and the cylinder head wall.
  • the shield ring has an open, i. radially slotted, ring shape on. As a result, the shielding ring can be widened during assembly.
  • the shielding ring is arranged in a groove which is formed in the cylinder head.
  • the shielding ring can be mounted in the cylinder head before the fuel injection valve is mounted.
  • the shield ring is arranged partially in a groove formed in the cylinder head and partly in a groove formed in the fuel injection valve.
  • the shielding ring is partially seated in the wall of the cylinder head and partially in the housing of the fuel injection valve, each correspondingly deep grooves are formed.
  • the grooves preferably have a depth which corresponds to a radius of the shielding ring with a round cross section.
  • a diameter of the shielding ring is equal to a thickness of the sealing element in the radial direction.
  • the shielding ring with a thin-walled C-shaped profile which has a convex curvature radially outward and thus encloses an open cavity towards the inside.
  • this embodiment of the shield is a particularly material-saving variant, which provides a high elasticity and shielding security.
  • an extended gap is provided in a side facing away from the combustion chamber side of the sealing element, which can accommodate excess material or abrasion or the like of the sealing element.
  • Figure 1 is a schematic sectional view of an internal combustion engine according to a first embodiment of the invention
  • Figure 2 is a schematic sectional view of an internal combustion engine according to a second embodiment of the present invention
  • Figure 3 is a schematic sectional view of an internal combustion engine according to a third embodiment of the present invention
  • Figure 4 is a schematic sectional view of a Internal combustion engine according to a fourth embodiment of the present invention
  • Figures 5 to 9 five further alternative embodiments of Ableringen having a radially outwardly rounded cross-section.
  • FIG. 1 shows the internal combustion engine 1 only partially and very schematically.
  • the reference numeral 2 denotes a cylinder head and the reference numeral 3 denotes a fuel injection valve.
  • the fuel injection valve 3 injects fuel 5 directly into a combustion chamber 4, which is shown schematically in FIG.
  • the reference numeral 2 denotes a cylinder head and the reference numeral 3 denotes a fuel injection valve.
  • the fuel injection valve 3 injects fuel 5 directly into a combustion chamber 4, which is shown schematically in FIG.
  • Fuel injection valve 3 is fixed in the cylinder head 2 and has a sealing element 6, which is for example a Teflon ring.
  • the sealing element 6 is arranged in a first groove 16 in the fuel injection valve 3.
  • the sealing element 6 thus seals the combustion chamber in the region of the fuel injection valve 3. Since the sealing element 6 is arranged relatively close to the combustion chamber, it is possible that during operation of the
  • a shielding ring 7 is now arranged in the gap 8, which has a round cross-section.
  • the shield ring 7 is made of a wire material and is disposed in a second annular groove 17.
  • the shielding ring 7 is thus arranged in the axial direction X-X of the fuel injection valve between the sealing element 6 and the combustion chamber 4.
  • a receiving space 10 for receiving abrasion or the like is also arranged.
  • the receiving space 10 is e.g. formed by an expanded gap between the cylinder head 2 and the fuel injection valve 3.
  • the shielding ring 7 with round cross section has the advantage that it allows a linear seal on the cylinder head and a linear seal on the fuel injection valve 3. In this way it can be ensured that influences from the combustion chamber 4 do not act directly on the sealing element 6. This allows the sealing element 6 have a very long life. In particular, the sealing element 6 can thereby be protected from a direct effect of the combustion chamber gases.
  • the sealing element 6 and the shielding ring 7 are not in contact with each other. This can also be avoided in particular that due to heat conduction damage to the sealing element occurs.
  • the sealing element 6 and the shielding ring 7 in a common groove 9, which in
  • Fuel injection valve 3 is provided, arranged.
  • the sealing element 6 and the shielding ring 7 are arranged directly adjacent to one another in the groove 9.
  • a simpler and more cost-effective production is possible since only one common groove for the sealing element 6 and the shielding ring 7 in the housing portion of the fuel injection valve 3 must be made.
  • a predetermined distance between the sealing element 6 and the shielding ring 7 in the common groove 9 may be present. Otherwise, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.
  • the third embodiment is similar to the first embodiment, in contrast to the shield 7 is disposed both partially in the cylinder head 2 and partially in the fuel injection valve 3.
  • a groove 2a is formed in the cylinder head 2 and a groove 3a is formed in the fuel injection valve 3.
  • the two grooves 2a, 3a are arranged at the same height.
  • the depth of the two grooves 2a and 3a is chosen such that each groove receives approximately half of the shielding ring 7.
  • the depths of the grooves 2a and 3a are each approximately the same as the radius of the shielding ring 7 having a round cross section.
  • Figure 4 shows a fourth embodiment, wherein identical or functionally identical parts are again denoted by the same reference numerals as in the previous embodiments.
  • the fourth embodiment corresponds essentially to the second embodiment, wherein in the fourth embodiment, a recess 9a is provided in the common groove 9.
  • the recess 9a is groove-shaped and runs around the entire circumference. Otherwise, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.
  • FIGS. 5 to 9 show five further alternative embodiments of shielding rings 7, which have a radially outwardly rounded cross-section, but are not completely round.
  • the shielding rings 7 shown in FIGS. 5, 6 and 7 have, on their inside towards the center axis X-X, e.g. each one parallel to the central axis X-X extending radially inner boundary wall.
  • the radially outer boundary wall of the shielding ring 7 extends either with a constant radius over its entire thickness (FIG. 5) or only with rounded corner regions whose
  • shielding rings 7 shown in FIGS. 8 and 9 are characterized in that they have a C-shaped profile with a convex curvature radially outward and thus enclose an open cavity towards the central axis X-X.
  • the shielding rings 7 are carried out so far similar to a curved thin-walled sheet and thus have no solid profile.
  • Figure 8 is a
  • Shielding ring 7 is shown, which is formed with a variable wall thickness, while the shielding ring 7 shown in Figure 9 is formed with a constant wall thickness.

Landscapes

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

Abstract

The invention relates to an internal combustion engine comprising a fuel chamber (4) and a fuel injection valve (3) that injects fuel (5) directly into the combustion chamber (4), the fuel injection valve (3) being disposed in a cylinder head (2). In order to seal the combustion chamber (4), a ring-shaped sealing element (6) is disposed between the fuel injection valve (3) and the cylinder head (2). A shield ring (7) is disposed in an axial direction (X-X) of the fuel injection valve (3) between the sealing element (6) and the combustion chamber (4), which is characterized in that it has a round cross section or a cross section that is rounded radially outward.

Description

Beschreibung description
Titeltitle
Brennkraftmaschine mit Dichtungsschutz für ein KraftstoffeinspritzventilInternal combustion engine with seal protection for a fuel injection valve
Stand der TechnikState of the art
Die vorliegende Erfindung betrifft eine Brennkraftmaschine mit einem Dichtungsschutz für eine Dichtung eines Kraftstoffeinspritzventils.The present invention relates to an internal combustion engine with a seal protection for a gasket of a fuel injection valve.
Brennkraftmaschinen sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Hierbei sind insbesondere Brennkraftmaschinen bekannt, welche einen Kraftstoff mittels eines Kraftstoffeinspritzventils direkt in einen Brennraum einspritzen. Hierzu ist das Kraftstoffeinspritzventil in einem Zylinderkopf angeordnet und spritzt den Kraftstoff direkt in den Brennraum ein. Zur Abdichtung zwischen dem Kraftstoffeinspritzventil und dem Zylinderkopf wird hierbei eine ringförmige Dichtung, beispielsweise ein Teflonring, verwendet. Da im Brennraum während des Betriebes sehr hohe Temperaturen herrschen und der Dichtring zwischen dem Kraftstoffeinspritzventil und dem Zylinderkopf relativ nahe am Brennraum angeordnet ist, können insbesondere negative thermische Einwirkungen auf den Dichtring wirken. Zwar wurde festgestellt, dass sich schon nach kurzer Betriebsdauer der Brennkraftmaschine in einem Spalt zwischen dem Kraftstoffeinspritzventil und dem Zylinderkopf brennraumseitig Rußpartikel anordnen können, welche die Dichtung teilweise gegen den Brennraum thermisch isolieren. Hierbei ist es in der Praxis jedoch derart, dass die Anlagerung der Rußpartikel nicht gleichmäßig erfolgt, so dass dadurch kein zuverlässiger Schutz für die Dichtung durch die Rußpartikelanlagerung möglich ist.Internal combustion engines are known from the prior art in different configurations. Here, in particular internal combustion engines are known, which inject a fuel by means of a fuel injection valve directly into a combustion chamber. For this purpose, the fuel injection valve is arranged in a cylinder head and injects the fuel directly into the combustion chamber. For sealing between the fuel injection valve and the cylinder head in this case an annular seal, such as a Teflon ring is used. Since very high temperatures prevail in the combustion chamber during operation and the sealing ring between the fuel injection valve and the cylinder head is arranged relatively close to the combustion chamber, in particular negative thermal effects can act on the sealing ring. Although it has been found that after a short period of operation of the internal combustion engine can arrange combustion chamber side soot particles in a gap between the fuel injection valve and the cylinder head, which partially thermally isolate the seal against the combustion chamber. However, in practice it is such that the deposition of the soot particles does not take place uniformly, so that no reliable protection for the seal by the soot particle adsorption is possible.
Ferner ist aus der DE 10 2005 019 313 Al ein Kraftstoffe inspritzventi I bekannt, bei welchem ein geschlitzter Abschirmring am Kraftstoffeinspritzventil angeordnet ist. Der Abschirmring ist dabei zwischen der Dichtung und dem Brennraum angeordnet und weist einen rechteckigen Querschnitt auf. Hierdurch kann jedoch keine vollständige Abschirmung des Dichtelements sichergestellt werden, da aufgrund des Schlitzes und des rechteckigen Querschnitts kein vollständiger Schutz des Dichtelements möglich ist. Vorteile der ErfindungFurthermore, DE 10 2005 019 313 A1 discloses a fuel injection valve I, in which a slotted shielding ring is arranged on the fuel injection valve. The shielding ring is arranged between the seal and the combustion chamber and has a rectangular cross-section. In this way, however, no complete shielding of the sealing element can be ensured, since due to the slot and the rectangular cross-section no complete protection of the sealing element is possible. Advantages of the invention
Die erfindungsgemäße Brennkraftmaschine mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass sie eine exzellente Abschirmung für einen zwischen einem Kraftstoffeinspritzventil und einem Zylinderkopf angeordneten Dichtelement bereitstellt, so dass das Dichtelement eine sehr hohe Lebensdauer aufweist. Die Abschirmung ist dabei in Axialrichtung des Kraftstoffeinspritzventils zwischen dem Dichtelement und einem Brennraum der Brennkraftmaschine angeordnet. Dabei weist die Abschirmung eine Ringform auf, welche zusätzlich einen runden Querschnitt bzw. einen radial außen abgerundeten Querschnitt hat. Die Verwendung des runden bzw. abgerundeten Querschnitts des Abschirmrings ermöglicht es dabei, dass der Abschirmring fest zwischen der Zylinderkopfwand und einer äußeren Gehäusewand des Kraftstoffeinspritzventils sitzt. Dadurch kann sichergestellt werden, dass während des Betriebes der Brennkraftmaschine im Brennraum auftretende Vorgänge keinen negativen Einfluss auf das Dichtelement haben, da das Dichtelement durch den Abschirmring geschützt ist. Die Ausbildung mit einem runden Querschnitt stellt dabei ferner sicher, dass ein linienförmiger Kontakt zwischen der Zylinderkopfwand und dem Kraftstoffeinspritzventil erreicht wird.The internal combustion engine according to the invention with the features of claim 1 has the advantage over that it provides excellent shielding for a arranged between a fuel injection valve and a cylinder head sealing element, so that the sealing element has a very long life. The shield is arranged in the axial direction of the fuel injection valve between the sealing element and a combustion chamber of the internal combustion engine. In this case, the shield has a ring shape, which in addition has a round cross section or a radially outwardly rounded cross-section. The use of the round or rounded cross-section of the shielding ring makes it possible for the shielding ring to sit firmly between the cylinder head wall and an outer housing wall of the fuel injection valve. This can ensure that processes occurring during operation of the internal combustion engine in the combustion chamber have no negative influence on the sealing element, since the sealing element is protected by the shielding ring. The design with a round cross section also ensures that a linear contact between the cylinder head wall and the fuel injection valve is achieved.
Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.
Gemäß einer bevorzugten Ausgestaltung der vorliegenden Erfindung ist der Abschirmring aus Draht hergestellt. Dadurch kann der Abschirmring besonders einfach und kostengünstig bereitgestellt werden. Ferner kann ein aus Draht hergestellter Abschirmring auch einfach montiert werden. Alternativ ist der Abschirmring aus einem hochtemperaturbeständigen Material, insbesondere einem haftungstemperaturbeständigen Kunststoff, hergestellt.According to a preferred embodiment of the present invention, the shielding ring is made of wire. As a result, the shielding can be provided particularly simple and inexpensive. Furthermore, a shield made of wire can also be easily mounted. Alternatively, the shield is made of a high temperature resistant material, in particular an adhesion temperature resistant plastic.
Vorzugsweise ist der Abschirmring in einer im Kraftstoffeinspritzventil gebildeten Nut angeordnet. Dadurch kann insbesondere die Zylinderkopfwand sehr einfach, z.B. als zylindrische Bohrung, ausgebildet sein.The shielding ring is preferably arranged in a groove formed in the fuel injection valve. Thereby, in particular, the cylinder head wall can be very easily, e.g. as a cylindrical bore, be formed.
Besonders bevorzugt ist das Dichtelement in einer im Kraftstoffeinspritzventil gebildeten ersten Nut angeordnet und der Abschirmring in einer im Kraftstoffe inspritzventi I gebildeten zweiten Nut angeordnet. Dadurch wird vermieden, dass der Abschirmring in direktem Kontakt mit dem Dichtelement steht. Allerdings müssen hierfür zwei separate Nuten in dem Kraftstoffeinspritzventil vorgesehen werden. Gemäß einer alternativen Ausgestaltung der vorliegenden Erfindung sind der Abschirmring und das Dichtelement in einer gemeinsamen Nut im Kraftstoffeinspritzventil angeordnet und voneinander beabstandet. Dadurch ist es möglich, dass nur eine Nut zur Aufnahme des Abschirmring und des Dichtelements im Kraftstoffeinspritzventil notwendig ist.Particularly preferably, the sealing element is arranged in a first groove formed in the fuel injection valve, and the shielding ring is arranged in a second groove formed in the fuel injection valve I. This avoids that the shielding ring is in direct contact with the sealing element. However, for this purpose, two separate grooves must be provided in the fuel injection valve. According to an alternative embodiment of the present invention, the shielding ring and the sealing element are arranged in a common groove in the fuel injection valve and spaced from each other. This makes it possible that only one groove for receiving the shielding ring and the sealing element in the fuel injection valve is necessary.
Der Abschirmring weist besonders bevorzugt eine geschlossene Ringform auf. Dies kann beispielsweise durch einen Verbindungsvorgang der freien Enden des Abschirmrings, z.B. mittels Schweißen oder Kleben, erfolgen. Dadurch werden insbesondere Probleme an einem Spalt zwischen Kraftstoffeinspritzventil und Zylinderkopfwand vermieden. Alternativ weist der Abschirmring eine offene, d.h. radial geschlitzte, Ringform auf. Dadurch kann der Abschirmring bei der Montage aufgeweitet werden.The shielding ring particularly preferably has a closed ring shape. This can be achieved, for example, by a joining operation of the free ends of the shielding ring, e.g. by welding or gluing done. As a result, in particular problems are avoided at a gap between the fuel injection valve and the cylinder head wall. Alternatively, the shield ring has an open, i. radially slotted, ring shape on. As a result, the shielding ring can be widened during assembly.
Gemäß einer weiteren alternativen Ausgestaltung der vorliegenden Erfindung ist der Abschirmring in einer Nut angeordnet, welche im Zylinderkopf gebildet ist. Dadurch kann der Abschirmring schon vor einer Montage des Kraftstoffeinspritzventils im Zylinderkopf montiert werden.According to a further alternative embodiment of the present invention, the shielding ring is arranged in a groove which is formed in the cylinder head. As a result, the shielding ring can be mounted in the cylinder head before the fuel injection valve is mounted.
Gemäß einer weiteren bevorzugten alternativen Ausgestaltung der vorliegenden Erfindung ist der Abschirmring teilweise in einer im Zylinderkopf gebildeten Nut und teilweise in einer im Kraftstoffeinspritzventil gebildeten Nut angeordnet. Mit anderen Worten sitzt der Abschirmring teilweise in der Wand des Zylinderkopfs und teilweise in dem Gehäuse des Kraftstoffeinspritzventils, wobei jeweils entsprechend tiefe Nuten gebildet sind. Die Nuten weisen vorzugsweise eine Tiefe auf, welche einem Radius des Abschirmrings mit rundem Querschnitt entspricht.According to a further preferred alternative embodiment of the present invention, the shield ring is arranged partially in a groove formed in the cylinder head and partly in a groove formed in the fuel injection valve. In other words, the shielding ring is partially seated in the wall of the cylinder head and partially in the housing of the fuel injection valve, each correspondingly deep grooves are formed. The grooves preferably have a depth which corresponds to a radius of the shielding ring with a round cross section.
Vorzugsweise ist ein Durchmesser des Abschirmrings gleich einer Dicke des Dichtelements in Radialrichtung.Preferably, a diameter of the shielding ring is equal to a thickness of the sealing element in the radial direction.
Besonders vorteilhaft ist es, den Abschirmring mit einem dünnwandigen C-förmigen Profil zu versehen, das eine konvexe Wölbung nach radial außen aufweist und damit nach innen hin einen offenen Hohlraum umschließt. Bei dieser Ausgestaltungsform des Abschirmrings handelt es sich um eine besonders materialsparende Variante, die dazu eine hohe Elastizität und Abschirmsicherheit bietet. Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist in einer vom Brennraum abgewandten Seite des Dichtelements ein erweiterter Spalt vorgesehen, welcher überschüssiges Material oder Abrieb oder Ähnliches des Dichtelements aufnehmen kann.It is particularly advantageous to provide the shielding ring with a thin-walled C-shaped profile which has a convex curvature radially outward and thus encloses an open cavity towards the inside. In this embodiment of the shield is a particularly material-saving variant, which provides a high elasticity and shielding security. According to a further preferred embodiment of the present invention, an extended gap is provided in a side facing away from the combustion chamber side of the sealing element, which can accommodate excess material or abrasion or the like of the sealing element.
Zeichnungdrawing
Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung zeigen:Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing show:
Figur 1 eine schematische Schnittansicht einer Brennkraftmaschine gemäß einem ersten Ausführungsbeispiel der Erfindung, Figur 2 eine schematische Schnittansicht einer Brennkraftmaschine gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung, Figur 3 eine schematische Schnittansicht einer Brennkraftmaschine gemäß einem dritten Ausführungsbeispiel der vorliegenden Erfindung, Figur 4 eine schematische Schnittansicht einer Brennkraftmaschine gemäß einem vierten Ausführungsbeispiel der vorliegenden Erfindung, undFigure 1 is a schematic sectional view of an internal combustion engine according to a first embodiment of the invention, Figure 2 is a schematic sectional view of an internal combustion engine according to a second embodiment of the present invention, Figure 3 is a schematic sectional view of an internal combustion engine according to a third embodiment of the present invention, Figure 4 is a schematic sectional view of a Internal combustion engine according to a fourth embodiment of the present invention, and
Figuren 5 bis 9 fünf weitere alternative Ausführungsbeispiele von Abschirmringen, die einen radial außen abgerundeten Querschnitt besitzen.Figures 5 to 9 five further alternative embodiments of Abschirmringen having a radially outwardly rounded cross-section.
Bevorzugte Ausführungsformen der ErfindungPreferred embodiments of the invention
Nachfolgend wird unter Bezugnahme auf die Figur 1 eine Brennkraftmaschine gemäß einem bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.Hereinafter, an internal combustion engine according to a preferred embodiment of the invention will be described in detail with reference to FIG.
Figur 1 zeigt die Brennkraftmaschine 1 nur teilweise und sehr schematisch. Das Bezugszeichen 2 bezeichnet dabei einen Zylinderkopf und mit dem Bezugszeichen 3 ist ein Kraftstoffeinspritzventil bezeichnet. Das Kraftstoffeinspritzventil 3 spritzt Kraftstoff 5 direkt in einen Brennraum 4 ein, was in Figur 1 schematisch dargestellt ist. DasFigure 1 shows the internal combustion engine 1 only partially and very schematically. The reference numeral 2 denotes a cylinder head and the reference numeral 3 denotes a fuel injection valve. The fuel injection valve 3 injects fuel 5 directly into a combustion chamber 4, which is shown schematically in FIG. The
Kraftstoffeinspritzventil 3 ist im Zylinderkopf 2 fixiert und weist ein Dichtelement 6 auf, welches beispielsweise ein Teflonring ist. Das Dichtelement 6 ist in einer ersten Nut 16 im Kraftstoffeinspritzventil 3 angeordnet. Das Dichtelement 6 dichtet somit den Brennraum im Bereich des Kraftstoffeinspritzventils 3 ab. Da das Dichtelement 6 relativ nahe am Brennraum angeordnet ist, ist es möglich, dass während des Betriebs derFuel injection valve 3 is fixed in the cylinder head 2 and has a sealing element 6, which is for example a Teflon ring. The sealing element 6 is arranged in a first groove 16 in the fuel injection valve 3. The sealing element 6 thus seals the combustion chamber in the region of the fuel injection valve 3. Since the sealing element 6 is arranged relatively close to the combustion chamber, it is possible that during operation of the
Brennkraftmaschine durch den Spalt 8 zwischen dem Zylinderkopf 2 und dem Kraftstoffeinspritzventil 3 negative Einflüsse auf das Dichtelement 6 wirken. Um dies zu verhindern, ist nun im Spalt 8 ein Abschirmring 7 angeordnet, welcher einen runden Querschnitt aufweist. Der Abschirmring 7 ist aus einem Drahtmaterial hergestellt und ist in einer zweiten ringförmigen Nut 17 angeordnet.Internal combustion engine through the gap 8 between the cylinder head 2 and the Fuel injection valve 3 negative influences on the sealing element 6 act. To prevent this, a shielding ring 7 is now arranged in the gap 8, which has a round cross-section. The shield ring 7 is made of a wire material and is disposed in a second annular groove 17.
Der Abschirmring 7 ist somit in Axialrichtung X-X des Kraftstoffeinspritzventils zwischen dem Dichtelement 6 und dem Brennraum 4 angeordnet. An einer brennraumabgewandten Seite des Dichtelements 6 ist ferner ein Aufnahmeraum 10 zur Aufnahme von Abrieb o.Ä. angeordnet. Der Aufnahmeraum 10 ist z.B. durch einen sich erweiterten Spalt zwischen dem Zylinderkopf 2 und dem Kraftstoffeinspritzventil 3 gebildet.The shielding ring 7 is thus arranged in the axial direction X-X of the fuel injection valve between the sealing element 6 and the combustion chamber 4. On a combustion chamber side facing away from the sealing element 6 is also a receiving space 10 for receiving abrasion or the like. arranged. The receiving space 10 is e.g. formed by an expanded gap between the cylinder head 2 and the fuel injection valve 3.
Der Abschirmring 7 mit rundem Querschnitt hat dabei den Vorteil, dass er eine linienförmige Abdichtung am Zylinderkopf und eine linienförmige Abdichtung am Kraftstoffeinspritzventil 3 ermöglicht. Hierdurch kann sichergestellt werden, dass Einflüsse aus dem Brennraum 4 nicht direkt auf das Dichtelement 6 wirken. Dadurch kann das Dichtelement 6 eine sehr lange Lebensdauer aufweisen. Insbesondere kann dadurch das Dichtelement 6 vor einer direkten Wirkung der Brennraumgase geschützt werden.The shielding ring 7 with round cross section has the advantage that it allows a linear seal on the cylinder head and a linear seal on the fuel injection valve 3. In this way it can be ensured that influences from the combustion chamber 4 do not act directly on the sealing element 6. This allows the sealing element 6 have a very long life. In particular, the sealing element 6 can thereby be protected from a direct effect of the combustion chamber gases.
Da zwischen dem Abschirmring 7 und dem Dichtelement 6 ein vorbestimmter Abstand vorhanden ist, sind das Dichtelement 6 und der Abschirmring 7 nicht miteinander in Kontakt. Dadurch kann insbesondere auch vermieden werden, dass aufgrund einer Wärmeleitung eine Beschädigung des Dichtelements auftritt.Since a predetermined distance is present between the shielding ring 7 and the sealing element 6, the sealing element 6 and the shielding ring 7 are not in contact with each other. This can also be avoided in particular that due to heat conduction damage to the sealing element occurs.
Nachfolgend wird unter Bezugnahme auf Figur 2 eine Brennkraftmaschine 1 gemäß einem zweiten Ausführungsbeispiel der Erfindung im Detail beschrieben. Gleiche bzw. funktional gleiche Teile sind dabei mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet.Hereinafter, an internal combustion engine 1 according to a second embodiment of the invention will be described in detail with reference to FIG. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
Im Unterschied zum ersten Ausführungsbeispiel sind beim zweiten Ausführungsbeispiel das Dichtelement 6 und der Abschirmring 7 in einer gemeinsamen Nut 9, welche imIn contrast to the first embodiment, in the second embodiment, the sealing element 6 and the shielding ring 7 in a common groove 9, which in
Kraftstoffeinspritzventil 3 vorgesehen ist, angeordnet. Dabei sind das Dichtelement 6 und der Abschirmring 7 unmittelbar benachbart zueinander in der Nut 9 angeordnet. Hierbei ist insbesondere eine einfachere und kostengünstigere Herstellung möglich, da nur eine gemeinsame Nut für das Dichtelement 6 und den Abschirmring 7 im Gehäusebereich des Kraftstoffeinspritzventils 3 hergestellt werden muss. Es sei angemerkt, dass hierbei auch ein vorbestimmter Abstand zwischen dem Dichtelement 6 und dem Abschirmring 7 in der gemeinsamen Nut 9 vorhanden sein kann. Ansonsten entspricht dieses Ausführungsbeispiel dem vorhergehenden Ausführungsbeispiel, so dass auf die dort gegebene Beschreibung verwiesen werden kann.Fuel injection valve 3 is provided, arranged. In this case, the sealing element 6 and the shielding ring 7 are arranged directly adjacent to one another in the groove 9. Here, in particular, a simpler and more cost-effective production is possible since only one common groove for the sealing element 6 and the shielding ring 7 in the housing portion of the fuel injection valve 3 must be made. It should be noted that in this case also a predetermined distance between the sealing element 6 and the shielding ring 7 in the common groove 9 may be present. Otherwise, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.
Nachfolgend wird unter Bezugnahme auf Figur 3 eine Brennkraftmaschine 1 gemäß einem dritten Ausführungsbeispiel der Erfindung beschrieben, wobei gleiche bzw. funktional gleiche Teile wieder mit den gleichen Bezugszeichen wie in den vorhergehenden Ausführungsbeispielen bezeichnet sind. Das dritte Ausführungsbeispiel ist ähnlich zum ersten Ausführungsbeispiel, wobei im Unterschied dazu der Abschirmring 7 sowohl teilweise im Zylinderkopf 2 als auch teilweise im Kraftstoffeinspritzventil 3 angeordnet ist. Hierzu ist im Zylinderkopf 2 eine Nut 2a ausgebildet und im Kraftstoffeinspritzventil 3 ist eine Nut 3a ausgebildet. In axialer Richtung X-X des Kraftstoffeinspritzventil 3 sind die beiden Nuten 2a, 3a auf gleicher Höhe angeordnet. Die Tiefe der beiden Nuten 2a und 3a ist dabei derart gewählt, dass jede Nut ungefähr die Hälfte des Abschirmrings 7 aufnimmt. Mit anderen Worten ist die Tiefe der Nuten 2a und 3a jeweils ungefähr gleich wie der Radius des Abschirmrings 7 mit rundem Querschnitt. Durch diese Maßnahme wird insbesondere eine verbesserte Fixierung des Abschirmrings 7 in der Brennkraftmaschine erreicht.An internal combustion engine 1 according to a third embodiment of the invention will be described below with reference to FIG. 3, wherein identical or functionally identical parts are again designated by the same reference numerals as in the preceding exemplary embodiments. The third embodiment is similar to the first embodiment, in contrast to the shield 7 is disposed both partially in the cylinder head 2 and partially in the fuel injection valve 3. For this purpose, a groove 2a is formed in the cylinder head 2 and a groove 3a is formed in the fuel injection valve 3. In the axial direction X-X of the fuel injection valve 3, the two grooves 2a, 3a are arranged at the same height. The depth of the two grooves 2a and 3a is chosen such that each groove receives approximately half of the shielding ring 7. In other words, the depths of the grooves 2a and 3a are each approximately the same as the radius of the shielding ring 7 having a round cross section. By this measure, in particular an improved fixation of the shielding ring 7 in the internal combustion engine is achieved.
Figur 4 zeigt ein viertes Ausführungsbeispiel, wobei gleiche bzw. funktional gleiche Teile wieder mit den gleichen Bezugszeichen wie in den vorherigen Ausführungsbeispielen bezeichnet sind. Das vierte Ausführungsbeispiel entspricht dabei im Wesentlichen dem zweiten Ausführungsbeispiel, wobei beim vierten Ausführungsbeispiel eine Vertiefung 9a in der gemeinsamen Nut 9 vorgesehen ist. In der Vertiefung 9a ist der Abschirmring 7 angeordnet. Die Vertiefung 9a ist rillenförmig ausgebildet und läuft um den gesamten Umfang herum. Ansonsten entspricht dieses Ausführungsbeispiel dem vorhergehenden Ausführungsbeispiel, so dass auf die dort gegebene Beschreibung verwiesen werden kann.Figure 4 shows a fourth embodiment, wherein identical or functionally identical parts are again denoted by the same reference numerals as in the previous embodiments. The fourth embodiment corresponds essentially to the second embodiment, wherein in the fourth embodiment, a recess 9a is provided in the common groove 9. In the recess 9a of the shield 7 is arranged. The recess 9a is groove-shaped and runs around the entire circumference. Otherwise, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.
In den Figuren 5 bis 9 sind fünf weitere alternative Ausführungsbeispiele von Abschirmringen 7 gezeigt, die einen radial außen abgerundeten Querschnitt besitzen, dabei aber nicht vollständig rund sind. Die in den Figuren 5, 6 und 7 dargestellten Abschirmringe 7 besitzen an ihrer zur Mittelachse X-X hin gerichteten Innenseite z.B. jeweils eine parallel zur Mittelachse X-X verlaufende radial innere Begrenzungswand. Die radial äußere Begrenzungswand des Abschirmrings 7 verläuft entweder mit einem konstanten Radius über seine gesamte Dicke (Figur 5) oder nur mit abgerundeten Eckbereichen, derenFIGS. 5 to 9 show five further alternative embodiments of shielding rings 7, which have a radially outwardly rounded cross-section, but are not completely round. The shielding rings 7 shown in FIGS. 5, 6 and 7 have, on their inside towards the center axis X-X, e.g. each one parallel to the central axis X-X extending radially inner boundary wall. The radially outer boundary wall of the shielding ring 7 extends either with a constant radius over its entire thickness (FIG. 5) or only with rounded corner regions whose
Rundungen mit entsprechenden Radien fließend von der radial äußeren Begrenzungswand zur oberen und unteren Stirnseite übergehen (Figur 6) oder deren Rundungen mit entsprechenden Radien einerseits zur radial äußeren Begrenzungswand tangential übergehen und andererseits zu der oberen und unteren Stirnseite nicht tangential übergehen (Figur 7).Roundings with corresponding radii flowing from the radially outer boundary wall go over to the upper and lower end side (Figure 6) or their curves with corresponding radii on the one hand tangentially to the radially outer boundary wall and on the other hand, not tangentially to the upper and lower end face (Figure 7).
Die in den Figuren 8 und 9 gezeigten Ausführungsbeispiele von Abschirmringen 7 zeichnen sich dadurch aus, dass sie ein C-förmiges Profil mit einer konvexen Wölbung nach radial außen aufweisen und damit zur Mittelachse X-X hin einen offenen Hohlraum umschließen. Bei diesen Beispielen sind die Abschirmringe 7 insofern ähnlich einem gebogenen dünnwandigen Blech ausgeführt und besitzen damit kein Vollprofil. In Figur 8 ist einThe embodiments of shielding rings 7 shown in FIGS. 8 and 9 are characterized in that they have a C-shaped profile with a convex curvature radially outward and thus enclose an open cavity towards the central axis X-X. In these examples, the shielding rings 7 are carried out so far similar to a curved thin-walled sheet and thus have no solid profile. In Figure 8 is a
Abschirmring 7 gezeigt, der mit einer veränderlichen Wanddicke ausgebildet ist, während der in Figur 9 dargestellte Abschirmring 7 mit konstanter Wanddicke ausgeformt ist. Shielding ring 7 is shown, which is formed with a variable wall thickness, while the shielding ring 7 shown in Figure 9 is formed with a constant wall thickness.

Claims

Ansprüche claims
1. Brennkraftmaschine, umfassend einen Brennraum (4) und ein Kraftstoffeinspritzventil (3), welches Kraftstoff (5) direkt in den Brennraum (4) einspritzt, wobei das Kraftstoffeinspritzventil (3) in einem Zylinderkopf (2) angeordnet ist und zwischen dem Kraftstoffeinspritzventil (3) und dem Zylinderkopf (2) ein ringförmiges Dichtelement (6) angeordnet ist, um den Brennraum (4) abzudichten, und wobei in einer Axialrichtung (X-X) des Kraftstoffeinspritzventils (3) zwischen dem Dichtelement (6) und dem Brennraum (4) ein Abschirmring (7) angeordnet ist, dadurch gekennzeichnet, dass der Abschirmring (7) einen runden Querschnitt bzw. einen radial außen abgerundeten Querschnitt aufweist.An internal combustion engine comprising a combustion chamber (4) and a fuel injection valve (3) which injects fuel (5) directly into the combustion chamber (4), wherein the fuel injection valve (3) is arranged in a cylinder head (2) and between the fuel injection valve (3). 3) and the cylinder head (2) an annular sealing element (6) is arranged to seal the combustion chamber (4), and wherein in an axial direction (XX) of the fuel injection valve (3) between the sealing element (6) and the combustion chamber (4) a shielding ring (7) is arranged, characterized in that the shielding ring (7) has a round cross section or a radially outwardly rounded cross section.
2. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Abschirmring (7) aus Draht oder hochtemperaturbeständigem Kunststoff hergestellt ist.2. Internal combustion engine according to claim 1, characterized in that the shielding ring (7) is made of wire or high temperature resistant plastic.
3. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abschirmring (7) in einer im Kraftstoffe inspritzventi I (3) gebildeten Nut (17, 9, 9a) angeordnet ist.3. Internal combustion engine according to one of the preceding claims, characterized in that the shielding ring (7) is arranged in a fuel injection valve in the I (3) formed groove (17, 9, 9a).
4. Brennkraftmaschine nach Anspruch 3, dadurch gekennzeichnet, dass das Dichtelement (6) in einer im Kraftstoffeinspritzventil (3) gebildeten ersten Nut (16) angeordnet ist und der Abschirmring (7) in einer im Kraftstoffe inspritzventi I (3) gebildeten zweiten Nut (17) angeordnet ist.4. Internal combustion engine according to claim 3, characterized in that the sealing element (6) in a fuel injection valve (3) formed in the first groove (16) is arranged and the shielding ring (7) in a fuel inspritzventi I (3) formed second groove ( 17) is arranged.
5. Brennkraftmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Abschirmring (7) und das Dichtelement (6) in einer gemeinsamen Nut (9) angeordnet sind und der Abschirmring (7) vom Dichtelement (6) beabstandet ist oder der Abschirmring (7) das Dichtelement (6) kontaktiert.5. Internal combustion engine according to claim 1 or 2, characterized in that the shielding ring (7) and the sealing element (6) are arranged in a common groove (9) and the shielding ring (7) from the sealing element (6) is spaced or the shielding ( 7) the sealing element (6) contacted.
6. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abschirmring (7) eine geschlossene Ringform oder eine offene Ringform aufweist.6. Internal combustion engine according to one of the preceding claims, characterized in that the shielding ring (7) has a closed ring shape or an open ring shape.
7. Brennkraftmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Abschirmring (7) teilweise in einer im Zylinderkopf (2) gebildeten Nut (2a) und teilweise in einer im Kraftstoffeinspritzventil (3) gebildeten Nut (3a) angeordnet ist.7. Internal combustion engine according to claim 1 or 2, characterized in that the Shielding ring (7) partially in a cylinder head (2) formed groove (2a) and partially in a fuel injection valve (3) formed groove (3a) is arranged.
8. Brennkraftmaschine nach Anspruch 7, dadurch gekennzeichnet, dass die im Zylinderkopf (2) gebildete Nut (2a) und die im Kraftstoffe inspritzventi I (3) gebildete Nut (3a) jeweils die gleiche Tiefe, insbesondere eine Tiefe entsprechend einem Radius des Abschirmrings (7) mit rundem Querschnitt, aufweisen.8. Internal combustion engine according to claim 7, characterized in that in the cylinder head (2) formed groove (2a) and in the fuel injectors I (3) formed groove (3a) each have the same depth, in particular a depth corresponding to a radius of the shield ( 7) with a round cross-section.
9. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Durchmesser des Abschirmrings (7) gleich einer Dicke des Dichtelements (6) in Radialrichtung ist.9. Internal combustion engine according to one of the preceding claims, characterized in that a diameter of the shielding ring (7) is equal to a thickness of the sealing element (6) in the radial direction.
10. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die radial äußere Begrenzungswand des Abschirmrings (7) zumindest in einem Teilbereich abgerundet verläuft, wobei ein konstanter Radius über seine gesamte Dicke vorgesehen ist oder abgerundete Eckbereiche ausgeformt sind.10. Internal combustion engine according to one of claims 1 to 7, characterized in that the radially outer boundary wall of the shielding ring (7) extends rounded at least in a partial area, wherein a constant radius is provided over its entire thickness or rounded corner areas are formed.
11. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Abschirmring (7) ein dünnwandiges C-förmiges Profil mit einer konvexen Wölbung nach radial außen aufweist und damit nach innen hin einen offenen Hohlraum umschließt.11. Internal combustion engine according to one of claims 1 to 7, characterized in that the shielding ring (7) has a thin-walled C-shaped profile with a convex curvature radially outward and thus encloses an open cavity towards the inside.
12. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an einer brennraumabgewandten Seite des Dichtelements (6) ein Aufnahmeraum (10) angeordnet ist, um Abrieb des Dichtelements (6) aufzunehmen. 12. Internal combustion engine according to one of the preceding claims, characterized in that on a combustion chamber side facing away from the sealing element (6) a receiving space (10) is arranged to receive abrasion of the sealing element (6).
EP08736639.9A 2007-05-02 2008-04-30 Internal combustion engine with sealing protection for a fuel injection valve Not-in-force EP2153055B1 (en)

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DE102008001489A DE102008001489A1 (en) 2007-05-02 2008-04-30 Internal combustion engine with seal protection for a fuel injection valve
PCT/EP2008/055328 WO2008135489A1 (en) 2007-05-02 2008-04-30 Internal combustion engine with sealing protection for a fuel injection valve

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CN101675241B (en) 2014-12-17
BRPI0807545A2 (en) 2014-06-17
EP2153055B1 (en) 2013-06-19
US20110303192A1 (en) 2011-12-15
WO2008135489A1 (en) 2008-11-13
CN101675241A (en) 2010-03-17
DE102008001489A1 (en) 2008-11-06

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