EP3867519B1 - Injector assembly - Google Patents

Injector assembly Download PDF

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Publication number
EP3867519B1
EP3867519B1 EP19786771.6A EP19786771A EP3867519B1 EP 3867519 B1 EP3867519 B1 EP 3867519B1 EP 19786771 A EP19786771 A EP 19786771A EP 3867519 B1 EP3867519 B1 EP 3867519B1
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EP
European Patent Office
Prior art keywords
protection sleeve
heat
combustion chamber
sealing ring
cylinder head
Prior art date
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Application number
EP19786771.6A
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German (de)
French (fr)
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EP3867519A1 (en
Inventor
Heinrich Werger
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
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Robert Bosch GmbH
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Publication of EP3867519A1 publication Critical patent/EP3867519A1/en
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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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07—Nozzles and injectors with controllable fuel supply
    • F02M2700/077—Injectors having cooling or heating means

Definitions

  • the invention relates to an injector arrangement with an injection nozzle for injecting medium into a combustion chamber, in particular for injecting fuel into a combustion chamber of an internal combustion engine, and with a sealing ring which is prestressed for sealing against a sealing surface of a cylinder head which comprises a through hole which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle with an end facing the combustion chamber by a radial pressure.
  • an injection nozzle for injecting medium into a combustion chamber, in particular fuel into the combustion chamber of an internal combustion engine comprising a nozzle body, the nozzle tip of which, which has the injection holes, projects into the combustion chamber, a heat protection sleeve which is arranged in the end region of the nozzle body on the combustion chamber side and surrounds the nozzle body, wherein the injection nozzle is inserted into a mounting hole of a holding part, in particular a cylinder head, the combustion chamber-side end area of the nozzle body interacting with the mounting hole with the heat protection sleeve being interposed, the heat protection sleeve having a first and a second area which are spaced apart axially, the second area is arranged closer to the nozzle tip than the first area, wherein in the first area on the outer shell a first outer circumferential sealing surface and on the inner shell a first inner circumferential sealing surface are formed and in the second region a second outer circumferential sealing
  • EP 3 014 105 B1 discloses a fuel injector, in particular a common rail injector, with an injector housing that can be inserted into a receiving opening of a cylinder head of an internal combustion engine and, in the installed position, has a first area facing a combustion chamber of the internal combustion engine, on the area facing away from the combustion chamber Side adjoins at least one second area with an enlarged diameter, the first area being made of metal and being surrounded radially on the side facing the combustion chamber by a first sealing element, which is inserted into the annular space between the first area of the injector housing and the receiving opening in the area of a first Bore section of the receiving bore can be used, and with a second sealing element which can be clamped axially on the side facing away from the combustion chamber between the injector housing and a contact surface of the receiving opening for the injector housing, the first sealing element being axially clamped between the injector housing e and a second contact surface of the receiving opening and is designed to seal the annular area between the injector
  • an internal combustion engine having a fuel injector assembly for mounting in an engine cylinder head, comprising: an engine cylinder head sealing surface, a fuel injector body having a longitudinal axis, a nozzle element housing and a nozzle holder; and an injector seal assembly positioned between the fuel injector body and the engine cylinder head, the injector seal assembly including a first material formed sealing component positioned in a space formed longitudinally between the fuel injector body and the engine cylinder head sealing surface to accommodate a fuel injector clamping force, and a thermally conductive component which is formed from a second material that is different than the first material, the second material having a higher thermal conductivity than the first material, and wherein the thermally conductive component is positioned radially between the nozzle member housing and the seal component to remove heat from to transfer the nozzle element housing to the sealing component.
  • the object of the invention is to provide an injector arrangement with an injection nozzle for injecting medium into a combustion chamber, in particular for injecting fuel into a combustion chamber of an internal combustion engine, and with a sealing ring which is prestressed for sealing against a sealing surface of a cylinder head which has a through hole through which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle by radial pressure at an end facing the combustion chamber.
  • the task is which includes a through hole through which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle at an end facing the combustion chamber by radial pressure, thereby released that the heat protection sleeve is non-positively connected to an end facing away from the combustion chamber by an axial pressure with the sealing ring.
  • the injection nozzle is also referred to as an injector and comprises a nozzle body, in which a nozzle needle can be moved back and forth in the direction of a longitudinal axis of the injection nozzle, around injection openings or injection holes, via which a medium subjected to high pressure, such as fuel, can be injected into the combustion chamber , release or close.
  • axial and radial refer to the longitudinal axis of the injector. Axial means towards or parallel to the longitudinal axis of the injector. Radial means perpendicular to the longitudinal axis of the injector.
  • the injector arrangement is advantageously used in the operation of modern internal combustion engines for injecting fuel subjected to high pressure, in particular diesel fuel and/or gas, into the combustion chamber.
  • the heat protection sleeve has, at its end facing away from the combustion chamber, a radially outwardly protruding collar, by means of which the heat protection sleeve is non-positively connected to the sealing ring. Radial outward means that the collar of the heat protection sleeve is directed away from the longitudinal axis of the injector. In this way, an axial interference fit is created between the heat protection sleeve and the sealing ring in a simple manner.
  • the sealing ring also has a collar that projects radially inward and is clamped in the axial direction between the collar of the heat protection sleeve that projects radially outward and the sealing surface of the cylinder head. Radially inwards means that the collar of the sealing ring is directed towards the longitudinal axis of the injection nozzle.
  • the collar of the sealing ring preferably has an essentially rectangular ring cross-section.
  • the collar of the heat protection sleeve advantageously also has an essentially rectangular annular cross section. The representation of an axial interference fit with the sealing ring and the heat protection sleeve is made possible in a simple manner via the two collars.
  • a preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve is pretensioned in the axial direction together with the sealing ring against the sealing surface of the cylinder head. In this way, an axial pressure between the sealing ring and the cylinder head can be shown via the heat protection sleeve. This further improves the seal against an undesired passage of fuel gas from the fuel gas.
  • Another preferred exemplary embodiment of the injector arrangement is characterized in that an annular space, which is formed in the radial direction between the heat protection sleeve and the cylinder head, is delimited in the axial direction at its end facing away from the combustion chamber by the radially outwardly protruding collar of the heat protection sleeve.
  • a further preferred exemplary embodiment of the injector arrangement is characterized in that a radial dimension of the inwardly protruding collar of the sealing ring is at least as large as the axial dimension of the radially outwardly projecting collar of the heat protection sleeve.
  • the axial dimension of the radially inwardly protruding collar of the sealing ring is advantageously somewhat larger than the radially outwardly protruding collar of the heat protection sleeve.
  • the axial dimension of the entire sealing ring is advantageously slightly more than twice the axial dimension of the heat protection sleeve.
  • a further preferred exemplary embodiment of the injector arrangement is characterized in that there is radial play between the collar of the heat protection sleeve, which projects radially outwards, and the sealing ring. This simplifies the representation of a radial interference fit between the heat protection sleeve and the injection nozzle.
  • the heat protection sleeve is particularly advantageously surrounded radially on the outside by an annular space. This annular space is delimited radially on the outside by the through-hole in the cylinder head and by the sealing ring.
  • a further preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve comprises a sleeve body which has the shape of a straight hollow cylinder with an inner lateral surface with which the heat protection sleeve is pressed against an outer lateral surface of the injection nozzle over its entire axial dimension. This ensures an extremely stable radial interference fit between the injection nozzle and the heat protection sleeve.
  • the entire inner lateral surface of the heat protection sleeve can be used for heat transfer between the injection nozzle and the heat protection sleeve.
  • a further preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve and the sealing ring are clamped in the axial direction between the sealing surface of the cylinder head and a nozzle clamping nut.
  • the radially outward collar of the heat protection sleeve is together with the radially inward collar of the sealing ring between the sealing surface of the cylinder head and the Nozzle clamping nut clamped.
  • the nozzle clamping nut is used in a manner known per se to mount the injection nozzle in the cylinder head.
  • the invention also relates to a heat protection sleeve and/or a sealing ring for an injector arrangement as described above.
  • the heat protection sleeve and the sealing ring can be sold separately.
  • the invention also relates to a kit for an injector arrangement as described above.
  • the modular system for the injector arrangement advantageously includes different heat protection sleeves and sealing rings. In this way, the injector arrangement can be easily adapted to different installation requirements and/or operating requirements.
  • FIG. 1 to 3 is an injector assembly 1; 31; 41 shown in three similar versions, each in longitudinal section.
  • the same reference numbers are used to denote the same or similar parts.
  • the injector assembly 1; 31; 41 includes an injection nozzle 2, with a in the Figures 1 to 3 lower end protrudes into a combustion chamber 3 of an internal combustion engine, not shown.
  • the internal combustion engine includes a cylinder head 4 with a through hole 5 through which the injection nozzle 2 protrudes into the combustion chamber 3 .
  • the cylinder head 4 has a sealing surface 6 facing away from the combustion chamber 3 .
  • the sealing surface 6 extends in a plane perpendicular to a longitudinal axis 8 of the injection nozzle 2.
  • the injection nozzle 2 comprises a nozzle body 9, in which a nozzle needle (not visible or not shown) can be moved back and forth in the direction of the longitudinal axis 8 in order (also to release or close passage holes or passage openings for fuel in the nozzle body 9 (not visible or not shown).
  • the structure and the function of the injection nozzle 2 can be the same or similar to that in the European patent specification EP 3 014 105 B1 disclosed fuel injector or in the Austrian patent AT 512 667 B1 described injector.
  • a heat protection sleeve 10 is assigned to the nozzle body 9 of the injection nozzle 2 in a manner known per se.
  • the heat protection sleeve 10 is formed from a material with good thermal conductivity, for example from a copper alloy. Heat is dissipated from the nozzle tip of the injection nozzle 2 via the heat protection sleeve 10 .
  • the heat protection sleeve 10 is non-positively connected at an end 11 facing the combustion chamber 3 to the nozzle body 9 of the injection nozzle 2 by a radial pressure 12 .
  • the heat protection sleeve 10 is non-positively connected at an end 13 facing away from the combustion chamber 3 to a nozzle clamping nut 15 and a sealing ring 20 by an axial pressure 14 .
  • the sealing ring 20 in turn is connected to the cylinder head 4 in a non-positive manner.
  • the nozzle clamping nut 15 is used in a manner known per se to mount the injection nozzle 2 in the cylinder head 4 .
  • the heat protection sleeve 10 has a collar 16 on its end 13 facing away from the combustion chamber 3 .
  • the collar 16 extends radially outwards from a base body 17 of the heat protection sleeve 10 .
  • the base body 17 of the heat protection sleeve 10 essentially has the shape of a straight hollow cylinder.
  • the collar 16 has a rectangular annular cross-section.
  • the heat protection sleeve 10 has an end section 18 with a reduced diameter.
  • the end section 18 with a reduced diameter serves to represent the radial pressure 12 between the heat protection sleeve 10 and the injection nozzle 2.
  • the collar 16 of the heat protection sleeve 10 serves to represent the axial pressure between the heat protection sleeve 10 and the sealing ring 20.
  • the through hole 5 in the cylinder head 4 delimits, together with the sealing ring 20 , an annular space 19 radially on the outside, which is delimited radially on the inside by the heat protection sleeve 10 .
  • the annular space 19 is open toward the combustion chamber 3 . At its end facing away from the combustion chamber 3 , the annular space 19 is delimited by the collar 16 of the heat protection sleeve 10 .
  • the sealing ring 20 comprises a base body 21 with a rectangular ring cross section.
  • a collar 22 extends radially inwards from the base body 21 of the sealing ring 20 .
  • the collar 22 of the sealing ring 20 is clamped in a non-positive manner in the axial direction between the collar 16 of the heat protection sleeve 10 and the sealing surface 6 of the cylinder head 4 .
  • the heat protection sleeve 10 is non-positively connected to the sealing ring 20, which in turn is non-positively connected to the cylinder head 4. This creates an axial interference fit that reliably prevents combustion gas from getting out of the combustion chamber 3 through the annular space 19 into an annular space 23 caused by the design.
  • the annular space 23 is in the Figures 1 to 3 axially limited by the collar 22 of the sealing ring 20 below.
  • the annular space 23 is delimited axially at the top by the nozzle clamping nut 15 .
  • the annular space 23 results from a structurally required radial play between the collar 16 of the heat insulation sleeve 10 and the base body 21 of the sealing ring 20.
  • the heat protection sleeve 10 a sleeve body 32 which has the shape of a right hollow cylinder.
  • the sleeve body 32 rests over its entire axial dimension, which is also referred to as length, with an inner lateral surface 33 on an outer lateral surface 34 of the nozzle body 9 of the injection nozzle 2 in a non-positive manner in order to produce the radial pressure 12 .
  • the sleeve body 32 At its end 11 facing the combustion chamber 3 , has an end section 18 with a reduced diameter.

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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)

Description

Die Erfindung betrifft eine Injektoranordnung mit einer Einspritzdüse, zum Einspritzen von Medium in einen Brennraum, insbesondere zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine, und mit einem Dichtring, der zur Abdichtung gegen eine Dichtfläche eines Zylinderkopfes vorgespannt ist, der ein Durchgangsloch umfasst, durch welches die Einspritzdüse in den Brennraum ragt und in welchem in radialer Richtung zwischen der Einspritzdüse und dem Zylinderkopf eine Wärmeschutzhülse angeordnet ist, die mit einem dem Brennraum zugewandten Ende durch eine radiale Pressung kraftschlüssig mit der Einspritzdüse verbunden ist.The invention relates to an injector arrangement with an injection nozzle for injecting medium into a combustion chamber, in particular for injecting fuel into a combustion chamber of an internal combustion engine, and with a sealing ring which is prestressed for sealing against a sealing surface of a cylinder head which comprises a through hole which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle with an end facing the combustion chamber by a radial pressure.

Stand der TechnikState of the art

Aus der österreichischen Patentschrift AT 512 667 B1 ist eine Einspritzdüse zum Einspritzen von Medium in einen Brennraum bekannt, insbesondere von Kraftstoff in den Brennraum einer Brennkraftmaschine, umfassend einen Düsenkörper, dessen die Spritzlöcher aufweisende Düsenspitze in den Brennraum hineinragt, eine im brennraumseitigen Endbereich des Düsenkörpers angeordnete Wärmeschutzhülse, die den Düsenkörper umgibt, wobei die Einspritzdüse in eine Aufnahmebohrung eines Halteteils, insbesondere Zylinderkopfes, eingesetzt ist, wobei der brennraumseitige Endbereich des Düsenkörpers unter Zwischenschaltung der Wärmeschutzhülse mit der Aufnahmebohrung zusammenwirkt, wobei die Wärmeschutzhülse einen ersten und einen zweiten Bereich aufweist, die voneinander axial beabstandet sind, wobei der zweite Bereich näher zur Düsenspitze angeordnet ist als der erste Bereich, wobei im ersten Bereich am Außenmantel eine erste äußere umfangsmäßige Dichtfläche und am Innenmantel eine erste innere umfangsmäßige Dichtfläche ausgebildet sind und im zweiten Bereich am Außenmantel eine zweite äußere umfangsmäßige Dichtfläche und am Innenmantel eine zweite innere umfangsmäßige Dichtfläche ausgebildet sind, wobei die zweiten Dichtflächen auf kleinerem Durchmesser liegen als die ersten Dichtflächen, wobei die erste äußere und die zweite äußere Dichtfläche jeweils dichtend mit einer in einer radialen Ebene verlaufenden, ringförmigen Sitzfläche oder mit einer kegeligen Sitzfläche der Aufnahmebohrung zusammenwirken und die erste innere und die zweite innere Dichtfläche jeweils dichtend mit einer in einer radialen Ebene verlaufenden, ringförmigen Sitzfläche oder mit einer kegeligen Sitzfläche des Düsenkörpers zusammenwirken. Aus der europäischen Patentschrift EP 3 014 105 B1 ist ein Kraftstoffinjektor, insbesondere ein Common-Rail-Injektor, bekannt, mit einem Injektorgehäuse, das in eine Aufnahmeöffnung eines Zylinderkopfs einer Brennkraftmaschine einsetzbar ist und in der Einbauposition einen einem Brennraum der Brennkraftmaschine zugewandten ersten Bereich aufweist, an den sich auf der dem Brennraum abgewandten Seite wenigstens ein im Durchmesser vergrößerter zweiter Bereich anschließt, wobei der erste Bereich aus Metall besteht und auf der dem Brennraum zugewandten Seite radial von einem ersten Dichtelement umgeben ist, das in den ringförmigen Raum zwischen dem ersten Bereich des Injektorgehäuses und der Aufnahmeöffnung im Bereich eines ersten Bohrungsabschnitts der Aufnahmebohrung einsetzbar ist, und mit einem zweiten Dichtelement, das an der dem Brennraum abgewandten Seite zwischen dem Injektorgehäuse und einer Anlagefläche der Aufnahmeöffnung für das Injektorgehäuse axial verspannbar ist, wobei das erste Dichtelement axial zwischen dem Injektorgehäuse und einer zweiten Anlagefläche der Aufnahmeöffnung spannbar ist und dazu ausgebildet ist, den ringförmigen Bereich zwischen dem Injektorgehäuse und der Aufnahmebohrung auf der dem ersten Bereich abgewandten Seite des ersten Dichtelements abzudichten, wobei die beiden Dichtelemente an einem Bauteil in Form einer aus Metall bestehenden Dichthülse ausgebildet sind, so dass die Dichthülse auf der dem Brennraum zugewandten Stirnseite einen konisch ausgebildeten ersten Dichtbereich als erstes Dichtelement aufweist, während der flanschförmig umlaufende Rand an der anderen Stirnseite der Dichthülse einen zweiten Dichtbereich beziehungsweise ein zweites Dichtelement ausbildet. Aus der Veröffentlichung der deutschen Übersetzung DE 11 2014 003 643 T5 der internationalen Veröffentlichung WO 2015/020790 ist ein Verbrennungsmotor mit einer Kraftstoffinjektoranordnung zur Montage in einem Motorzylinderkopf bekannt, umfassend: eine Motorzylinderkopfabdichtungsoberfläche, einen Kraftstoffinjektorkörper, welcher eine longitudinale Achse, ein Düsenelementgehäuse und einen Düsenhalter aufweist; und eine Injektordichtungsanordnung, welche zwischen dem Kraftstoffinjektorkörper und dem Motorzylinderkopf positioniert ist, wobei die Injektordichtungsanordnung eine aus einen ersten Material gebildete Dichtungskomponente, welche in einem longitudinal zwischen dem Kraftstoffinjektorkörper und der Motorzylinderkopfabdichtungsoberfläche gebildeten Raum positioniert ist, um eine Kraftstoffinjektorklemmkraft aufzunehmen, und eine thermisch leitfähige Komponente aufweist, welche aus einem zweiten Material gebildet ist, das anders ist als das erste Material, wobei das zweite Material eine höhere thermische Leitfähigkeit hat als das erste Material und wobei die thermisch leitfähige Komponente radial zwischen dem Düsenelementgehäuse und der Dichtungskomponente positioniert ist, um Hitze von dem Düsenelementgehäuse zu der Dichtungskomponente zu übertragen.From the Austrian patent specification AT 512 667 B1 an injection nozzle for injecting medium into a combustion chamber, in particular fuel into the combustion chamber of an internal combustion engine, is known, comprising a nozzle body, the nozzle tip of which, which has the injection holes, projects into the combustion chamber, a heat protection sleeve which is arranged in the end region of the nozzle body on the combustion chamber side and surrounds the nozzle body, wherein the injection nozzle is inserted into a mounting hole of a holding part, in particular a cylinder head, the combustion chamber-side end area of the nozzle body interacting with the mounting hole with the heat protection sleeve being interposed, the heat protection sleeve having a first and a second area which are spaced apart axially, the second area is arranged closer to the nozzle tip than the first area, wherein in the first area on the outer shell a first outer circumferential sealing surface and on the inner shell a first inner circumferential sealing surface are formed and in the second region a second outer circumferential sealing surface is formed on the outer casing and a second inner circumferential sealing surface is formed on the inner casing, the second sealing surfaces having a smaller diameter than the first sealing surfaces, the first outer and the second outer sealing surface each sealing interact with an annular seat surface running in a radial plane or with a conical seat surface of the receiving bore and the first inner and the second inner sealing surface each cooperate in a sealing manner with an annular seat surface running in a radial plane or with a conical seat surface of the nozzle body. From the European patent specification EP 3 014 105 B1 discloses a fuel injector, in particular a common rail injector, with an injector housing that can be inserted into a receiving opening of a cylinder head of an internal combustion engine and, in the installed position, has a first area facing a combustion chamber of the internal combustion engine, on the area facing away from the combustion chamber Side adjoins at least one second area with an enlarged diameter, the first area being made of metal and being surrounded radially on the side facing the combustion chamber by a first sealing element, which is inserted into the annular space between the first area of the injector housing and the receiving opening in the area of a first Bore section of the receiving bore can be used, and with a second sealing element which can be clamped axially on the side facing away from the combustion chamber between the injector housing and a contact surface of the receiving opening for the injector housing, the first sealing element being axially clamped between the injector housing e and a second contact surface of the receiving opening and is designed to seal the annular area between the injector housing and the receiving bore on the side of the first sealing element facing away from the first area, the two sealing elements being formed on a component in the form of a metal sealing sleeve so that the sealing sleeve has a conical first sealing area as the first sealing element on the end face facing the combustion chamber, while the flange-shaped circumferential edge on the other end face of the sealing sleeve forms a second sealing area or a second sealing element. From the publication of the German translation DE 11 2014 003 643 T5 the international publication WO 2015/020790 there is known an internal combustion engine having a fuel injector assembly for mounting in an engine cylinder head, comprising: an engine cylinder head sealing surface, a fuel injector body having a longitudinal axis, a nozzle element housing and a nozzle holder; and an injector seal assembly positioned between the fuel injector body and the engine cylinder head, the injector seal assembly including a first material formed sealing component positioned in a space formed longitudinally between the fuel injector body and the engine cylinder head sealing surface to accommodate a fuel injector clamping force, and a thermally conductive component which is formed from a second material that is different than the first material, the second material having a higher thermal conductivity than the first material, and wherein the thermally conductive component is positioned radially between the nozzle member housing and the seal component to remove heat from to transfer the nozzle element housing to the sealing component.

Offenbarung der ErfindungDisclosure of Invention

Aufgabe der Erfindung ist es, eine Injektoranordnung mit einer Einspritzdüse, zum Einspritzen von Medium in einen Brennraum, insbesondere zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine, und mit einem Dichtring, der zur Abdichtung gegen eine Dichtfläche eines Zylinderkopfes vorgespannt ist, der ein Durchgangsloch umfasst, durch welches die Einspritzdüse in den Brennraum ragt und in welchem in radialer Richtung zwischen der Einspritzdüse und dem Zylinderkopf eine Wärmeschutzhülse angeordnet ist, die mit einem dem Brennraum zugewandten Ende durch eine radiale Pressung kraftschlüssig mit der Einspritzdüse verbunden ist, funktionell zu verbessern.The object of the invention is to provide an injector arrangement with an injection nozzle for injecting medium into a combustion chamber, in particular for injecting fuel into a combustion chamber of an internal combustion engine, and with a sealing ring which is prestressed for sealing against a sealing surface of a cylinder head which has a through hole through which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle by radial pressure at an end facing the combustion chamber.

Die Aufgabe ist bei einer Injektoranordnung mit einer Einspritzdüse, zum Einspritzen von Medium in einen Brennraum, insbesondere zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine, und mit einem Dichtring, der zur Abdichtung gegen eine Dichtfläche eines Zylinderkopfes vorgespannt ist, der ein Durchgangsloch umfasst, durch welches die Einspritzdüse in den Brennraum ragt und in welchem in radialer Richtung zwischen der Einspritzdüse und dem Zylinderkopf eine Wärmeschutzhülse angeordnet ist, die mit einem dem Brennraum zugewandten Ende durch eine radiale Pressung kraftschlüssig mit der Einspritzdüse verbunden ist, dadurch gelöst, dass die Wärmschutzhülse mit einem dem Brennraum abgewandten Ende durch eine axiale Pressung kraftschlüssig mit dem Dichtring verbunden ist. Die Einspritzdüse wird auch als Injektor bezeichnet und umfasst einen Düsenkörper, in welchem eine Düsennadel in Richtung einer Längsachse der Einspritzdüse hin und her bewegbar ist, um Einspritzöffnungen oder Einspritzlöcher, über die ein mit Hochdruck beaufschlagtes Medium, wie Kraftstoff, in den Brennraum eingespritzt werden kann, freizugeben oder zu verschließen. Die Begriffe axial und radial beziehen sich auf die Längsachse der Einspritzdüse. Axial bedeutet in Richtung oder parallel zur Längsachse der Einspritzdüse. Radial bedeutet quer zur Längsachse der Einspritzdüse. Die Injektoranordnung wird vorteilhaft im Betrieb von modernen Brennkraftmaschinen zum Einspritzen von mit Hochdruck beaufschlagtem Kraftstoff, insbesondere Dieselkraftstoff und/oder Gas, in den Brennraum verwendet. Bei im Rahmen der vorliegenden Erfindung durchgeführten Versuchen und Untersuchungen wurde herausgefunden, dass bei einer herkömmlichen Injektoranordnung Brenngas aus dem Brennraum entlang eines Ringspalts zwischen der Wärmeschutzhülse und dem Dichtring in einen Ringraum auf einer den Brennraum abgewandten Seite der Wärmeschutzhülse lecken kann. Wenn das in dem Ringraum befindliche Gas abkühlt, dann kann es passieren, dass sich aus dem Brenngas aggressive Medien abscheiden, die an den den Brennraum begrenzenden Teilen Korrosion verursachen können, was unerwünscht ist. Durch die axiale Pressung wird eine dichte Verbindung zwischen der Wärmeschutzhülse und dem Dichtring geschaffen. So kann ein unerwünschter Durchtritt von Brenngas zwischen der Wärmeschutzhülse und dem Dichtring sicher verhindert werden. So kann mit der Wärmeschutzhülse zusätzlich zu der bekannten Wärmeabführfunktion eine Dichtfunktion realisiert werden.In the case of an injector arrangement with an injection nozzle, for injecting medium into a combustion chamber, in particular for injecting fuel into a combustion chamber of an internal combustion engine, and with a sealing ring which is prestressed for sealing against a sealing surface of a cylinder head, the task is which includes a through hole through which the injection nozzle protrudes into the combustion chamber and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is non-positively connected to the injection nozzle at an end facing the combustion chamber by radial pressure, thereby released that the heat protection sleeve is non-positively connected to an end facing away from the combustion chamber by an axial pressure with the sealing ring. The injection nozzle is also referred to as an injector and comprises a nozzle body, in which a nozzle needle can be moved back and forth in the direction of a longitudinal axis of the injection nozzle, around injection openings or injection holes, via which a medium subjected to high pressure, such as fuel, can be injected into the combustion chamber , release or close. The terms axial and radial refer to the longitudinal axis of the injector. Axial means towards or parallel to the longitudinal axis of the injector. Radial means perpendicular to the longitudinal axis of the injector. The injector arrangement is advantageously used in the operation of modern internal combustion engines for injecting fuel subjected to high pressure, in particular diesel fuel and/or gas, into the combustion chamber. Tests and investigations carried out within the scope of the present invention have found that in a conventional injector arrangement, fuel gas can leak from the combustion chamber along an annular gap between the heat protection sleeve and the sealing ring into an annular space on a side of the heat protection sleeve which faces away from the combustion chamber. When the gas in the annular space cools down, it can happen that aggressive media separate from the fuel gas, which can cause corrosion on the parts delimiting the combustion space, which is undesirable. The axial pressure creates a tight connection between the heat protection sleeve and the sealing ring. In this way, an undesired passage of combustion gas between the heat protection sleeve and the sealing ring can be reliably prevented. In addition to the known heat dissipation function, a sealing function can be implemented with the heat protection sleeve.

Erfindungsgemäß weist die Wärmeschutzhülse an ihrem dem Brennraum abgewandten Ende einen radial nach außen abstehenden Bund auf, durch den die Wärmeschutzhülse kraftschlüssig mit dem Dichtring verbunden ist. Radial nach außen bedeutet, dass der Bund der Wärmeschutzhülse von der Längsachse der Einspritzdüse weg gerichtet ist. So wird auf einfache Art und Weise ein axialer Pressverband zwischen der Wärmeschutzhülse und dem Dichtring geschaffen.According to the invention, the heat protection sleeve has, at its end facing away from the combustion chamber, a radially outwardly protruding collar, by means of which the heat protection sleeve is non-positively connected to the sealing ring. Radial outward means that the collar of the heat protection sleeve is directed away from the longitudinal axis of the injector. In this way, an axial interference fit is created between the heat protection sleeve and the sealing ring in a simple manner.

Weiter weist der Dichtring einen radial nach innen abstehenden Bund auf, der in axialer Richtung zwischen dem radial nach außen abstehenden Bund der Wärmeschutzhülse und der Dichtfläche des Zylinderkopfes eingespannt ist. Radial nach innen bedeutet, dass der Bund des Dichtrings zur Längsachse der Einspritzdüse hin gerichtet ist. Der Bund des Dichtrings hat vorzugsweise einen im Wesentlichen rechteckigen Ringquerschnitt. Der Bund der Wärmeschutzhülse hat vorteilhaft ebenfalls einen im Wesentlichen rechteckigen Ringquerschnitt. Über die beiden Bunde wird auf einfache Art und Weise die Darstellung eines axialen Pressverbands mit dem Dichtring und der Wärmeschutzhülse ermöglicht.The sealing ring also has a collar that projects radially inward and is clamped in the axial direction between the collar of the heat protection sleeve that projects radially outward and the sealing surface of the cylinder head. Radially inwards means that the collar of the sealing ring is directed towards the longitudinal axis of the injection nozzle. The collar of the sealing ring preferably has an essentially rectangular ring cross-section. The collar of the heat protection sleeve advantageously also has an essentially rectangular annular cross section. The representation of an axial interference fit with the sealing ring and the heat protection sleeve is made possible in a simple manner via the two collars.

Ein bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass die Wärmeschutzhülse in axialer Richtung zusammen mit dem Dichtring gegen die Dichtfläche des Zylinderkopfes vorgespannt ist. So kann über die Wärmeschutzhülse eine axiale Pressung zwischen dem Dichtring und dem Zylinderkopf dargestellt werden. Dadurch wird die Abdichtung gegenüber einem unerwünschten Durchtritt von Brenngas aus dem Brenngas weiter verbessert.A preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve is pretensioned in the axial direction together with the sealing ring against the sealing surface of the cylinder head. In this way, an axial pressure between the sealing ring and the cylinder head can be shown via the heat protection sleeve. This further improves the seal against an undesired passage of fuel gas from the fuel gas.

Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass ein Ringraum, der in radialer Richtung zwischen der Wärmeschutzhülse und dem Zylinderkopf ausgebildet ist, an seinem dem Brennraum abgewandten Ende in axialer Richtung von dem radial nach außen abstehenden Bund der Wärmeschutzhülse begrenzt ist. Dadurch wird ein unerwünschter Durchtritt von Brenngas aus dem Brennraum an dem dem Brennraum abgewandten Ende des Ringraums sicher verhindert. An seinem dem Brennraum zugewandten Ende ist der Ringraum konstruktiv bedingt offen.Another preferred exemplary embodiment of the injector arrangement is characterized in that an annular space, which is formed in the radial direction between the heat protection sleeve and the cylinder head, is delimited in the axial direction at its end facing away from the combustion chamber by the radially outwardly protruding collar of the heat protection sleeve. As a result, an undesired passage of combustion gas from the combustion chamber at the end of the annular chamber facing away from the combustion chamber is reliably prevented. At its end facing the combustion chamber, the annular space is open due to the design.

Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass eine radiale Abmessung des nach innen abstehenden Bundes des Dichtrings mindestens genauso groß wie die axiale Abmessung des radial nach außen abstehenden Bundes der Wärmeschutzhülse ist. Die axiale Abmessung des radial nach innen abstehenden Bundes des Dichtrings ist vorteilhaft etwas größer als der radial nach außen abstehende Bund der Wärmeschutzhülse. Die axiale Abmessung des gesamten Dichtrings ist vorteilhaft etwas mehr als doppelt so groß wie die axiale Abmessung der Wärmeschutzhülse.A further preferred exemplary embodiment of the injector arrangement is characterized in that a radial dimension of the inwardly protruding collar of the sealing ring is at least as large as the axial dimension of the radially outwardly projecting collar of the heat protection sleeve. The axial dimension of the radially inwardly protruding collar of the sealing ring is advantageously somewhat larger than the radially outwardly protruding collar of the heat protection sleeve. The axial dimension of the entire sealing ring is advantageously slightly more than twice the axial dimension of the heat protection sleeve.

Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass zwischen dem radial nach außen abstehenden Bund der Wärmeschutzhülse und dem Dichtring ein radiales Spiel vorhanden ist. Dadurch wird die Darstellung eines radialen Pressverbands zwischen der Wärmeschutzhülse und der Einspritzdüse vereinfacht. Besonders vorteilhaft ist die Wärmeschutzhülse radial außen von einem Ringraum umgeben. Dieser Ringraum wird radial außen von dem Durchgangsloch in dem Zylinderkopf und von dem Dichtring begrenzt.A further preferred exemplary embodiment of the injector arrangement is characterized in that there is radial play between the collar of the heat protection sleeve, which projects radially outwards, and the sealing ring. This simplifies the representation of a radial interference fit between the heat protection sleeve and the injection nozzle. The heat protection sleeve is particularly advantageously surrounded radially on the outside by an annular space. This annular space is delimited radially on the outside by the through-hole in the cylinder head and by the sealing ring.

Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass die Wärmeschutzhülse einen Hülsenkörper umfasst, der die Gestalt eines geraden Hohlzylinders mit einer inneren Mantelfläche aufweist, mit welcher die Wärmeschutzhülse über ihre gesamte axiale Abmessung gegen eine äußere Mantelfläche der Einspritzdüse gepresst ist. Dadurch wird ein äußerst stabiler radialer Pressverband zwischen der Einspritzdüse und der Wärmeschutzhülse sichergestellt. Darüber hinaus kann die gesamte innere Mantelfläche der Wärmeschutzhülse für den Wärmeübergang zwischen der Einspritzdüse und der Wärmeschutzhülse genutzt werden.A further preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve comprises a sleeve body which has the shape of a straight hollow cylinder with an inner lateral surface with which the heat protection sleeve is pressed against an outer lateral surface of the injection nozzle over its entire axial dimension. This ensures an extremely stable radial interference fit between the injection nozzle and the heat protection sleeve. In addition, the entire inner lateral surface of the heat protection sleeve can be used for heat transfer between the injection nozzle and the heat protection sleeve.

Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass die Wärmeschutzhülse und der Dichtring in axialer Richtung zwischen der Dichtfläche des Zylinderkopfes und einer Düsenspannmutter eingespannt sind. Der radial nach außen stehende Bund der Wärmeschutzhülse ist zusammen mit dem radial nach innen abstehenden Bund des Dichtrings zwischen der Dichtfläche des Zylinderkopfes und der Düsenspannmutter eingespannt. Die Düsenspannmutter dient in an sich bekannter Art und Weise dazu, die Einspritzdüse in dem Zylinderkopf zu montieren.A further preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve and the sealing ring are clamped in the axial direction between the sealing surface of the cylinder head and a nozzle clamping nut. The radially outward collar of the heat protection sleeve is together with the radially inward collar of the sealing ring between the sealing surface of the cylinder head and the Nozzle clamping nut clamped. The nozzle clamping nut is used in a manner known per se to mount the injection nozzle in the cylinder head.

Die Erfindung betrifft des Weiteren eine Wärmeschutzhülse und/oder einen Dichtring für eine vorab beschriebene Injektoranordnung. Die Wärmeschutzhülse und der Dichtring sind separat handelbar.The invention also relates to a heat protection sleeve and/or a sealing ring for an injector arrangement as described above. The heat protection sleeve and the sealing ring can be sold separately.

Die Erfindung betrifft darüber hinaus einen Baukasten für eine vorab beschriebene Injektoranordnung. Der Baukasten für die Injektoranordnung umfasst vorteilhaft unterschiedliche Wärmeschutzhülsen und Dichtringe. So kann die Injektoranordnung auf einfache Art und Weise an unterschiedliche Einbauvorgaben und/oder Betriebsvorgaben angepasst werden.The invention also relates to a kit for an injector arrangement as described above. The modular system for the injector arrangement advantageously includes different heat protection sleeves and sealing rings. In this way, the injector arrangement can be easily adapted to different installation requirements and/or operating requirements.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele im Einzelnen beschrieben sind.Further advantages, features and details of the invention result from the following description in which various exemplary embodiments are described in detail with reference to the drawing.

Kurze Beschreibung der ZeichnungBrief description of the drawing

Es zeigen:

  • Figur 1 eine Injektoranordnung mit einer Einspritzdüse und mit einer Wärmeschutzhülse, die mit einem einem Brennraum zugewandten Ende durch eine radiale Pressung kraftschlüssig mit der Einspritzdüse verbunden ist, wobei die Wärmeschutzhülse mit einem dem Brennraum abgewandten Ende durch eine axiale Pressung kraftschlüssig mit einem Dichtring verbunden ist, im Längsschnitt;
  • Figur 2 eine ähnliche Darstellung wie in Figur 1 mit einer optimierten Wärmeschutzhülse; und
  • Figur 3 eine ähnliche Darstellung wie in den Figuren 1 und 2 mit einer weiter optimierten Wärmeschutzhülse.
Show it:
  • figure 1 an injector arrangement with an injection nozzle and with a heat protection sleeve, which is non-positively connected to the injection nozzle at an end facing a combustion chamber by radial pressure, wherein the heat protection sleeve is non-positively connected to a sealing ring at an end facing away from the combustion chamber by axial pressure, in longitudinal section ;
  • figure 2 a similar representation as in figure 1 with an optimized heat protection sleeve; and
  • figure 3 a representation similar to that in figures 1 and 2 with a further optimized heat protection sleeve.

Beschreibung der AusführungsbeispieleDescription of the exemplary embodiments

In den Figuren 1 bis 3 ist eine Injektoranordnung 1; 31; 41 in drei ähnlichen Ausführungen jeweils im Längsschnitt dargestellt. Zur Bezeichnung gleicher oder ähnlicher Teile werden die gleichen Bezugszeichen verwendet. Zunächst werden die Gemeinsamkeiten der Ausführungsformen beschrieben. Danach wird auf die Unterschiede zwischen den einzelnen Ausführungsformen eingegangen.In the Figures 1 to 3 is an injector assembly 1; 31; 41 shown in three similar versions, each in longitudinal section. The same reference numbers are used to denote the same or similar parts. First, the similarities between the embodiments will be described. After that, the differences between the individual embodiments will be discussed.

Die Injektoranordnung 1; 31; 41 umfasst eine Einspritzdüse 2, die mit einem in den Figuren 1 bis 3 unteren Ende in einen Brennraum 3 einer nicht näher dargestellten Brennkraftmaschine ragt. Die Brennkraftmaschine umfasst einen Zylinderkopf 4 mit einem Durchgangsloch 5, durch das die Einspritzdüse 2 in den Brennraum 3 ragt.The injector assembly 1; 31; 41 includes an injection nozzle 2, with a in the Figures 1 to 3 lower end protrudes into a combustion chamber 3 of an internal combustion engine, not shown. The internal combustion engine includes a cylinder head 4 with a through hole 5 through which the injection nozzle 2 protrudes into the combustion chamber 3 .

Der Zylinderkopf 4 weist eine dem Brennraum 3 abgewandte Dichtfläche 6 auf. Die Dichtfläche 6 erstreckt sich in einer Ebene senkrecht zu einer Längsachse 8 der Einspritzdüse 2. Die Einspritzdüse 2 umfasst einen Düsenkörper 9, in welchem eine (nicht sichtbare beziehungsweise nicht dargestellte) Düsennadel in Richtung der Längsachse 8 hin und her bewegbar ist, um (ebenfalls nicht sichtbare beziehungsweise nicht dargestellte) Durchtrittslöcher oder Durchtrittsöffnungen für Kraftstoff in dem Düsenkörper 9 freizugeben oder zu verschließen.The cylinder head 4 has a sealing surface 6 facing away from the combustion chamber 3 . The sealing surface 6 extends in a plane perpendicular to a longitudinal axis 8 of the injection nozzle 2. The injection nozzle 2 comprises a nozzle body 9, in which a nozzle needle (not visible or not shown) can be moved back and forth in the direction of the longitudinal axis 8 in order (also to release or close passage holes or passage openings for fuel in the nozzle body 9 (not visible or not shown).

Der Aufbau und die Funktion der Einspritzdüse 2 können so oder so ähnlich sein wie bei dem in der europäischen Patentschrift EP 3 014 105 B1 offenbarten Kraftstoffinjektor oder der in der österreichischen Patentschrift AT 512 667 B1 beschriebenen Einspritzdüse.The structure and the function of the injection nozzle 2 can be the same or similar to that in the European patent specification EP 3 014 105 B1 disclosed fuel injector or in the Austrian patent AT 512 667 B1 described injector.

Dem Düsenkörper 9 der Einspritzdüse 2 ist an sich bekannter Art und Weise eine Wärmeschutzhülse 10 zugeordnet. Die Wärmeschutzhülse 10 ist aus einem gut wärmeleitenden Material gebildet, zum Beispiel aus einer Kupferlegierung. Über die Wärmeschutzhülse 10 wird Wärme von der Düsenspitze der Einspritzdüse 2 abgeleitet.A heat protection sleeve 10 is assigned to the nozzle body 9 of the injection nozzle 2 in a manner known per se. The heat protection sleeve 10 is formed from a material with good thermal conductivity, for example from a copper alloy. Heat is dissipated from the nozzle tip of the injection nozzle 2 via the heat protection sleeve 10 .

Die Wärmeschutzhülse 10 ist an einem dem Brennraum 3 zugewandten Ende 11 durch eine radiale Pressung 12 kraftschlüssig mit dem Düsenkörper 9 der Einspritzdüse 2 verbunden. Die Wärmeschutzhülse 10 ist an einem dem Brennraum 3 abgewandten Ende 13 durch eine axiale Pressung 14 kraftschlüssig mit einer Düsenspannmutter 15 und einem Dichtring 20 verbunden. Der Dichtring 20 wiederum ist kraftschlüssig mit dem Zylinderkopf 4 verbunden. Die Düsenspannmutter 15 dient in an sich bekannter Art und Weise dazu, die Einspritzdüse 2 in dem Zylinderkopf 4 zu montieren.The heat protection sleeve 10 is non-positively connected at an end 11 facing the combustion chamber 3 to the nozzle body 9 of the injection nozzle 2 by a radial pressure 12 . The heat protection sleeve 10 is non-positively connected at an end 13 facing away from the combustion chamber 3 to a nozzle clamping nut 15 and a sealing ring 20 by an axial pressure 14 . The sealing ring 20 in turn is connected to the cylinder head 4 in a non-positive manner. The nozzle clamping nut 15 is used in a manner known per se to mount the injection nozzle 2 in the cylinder head 4 .

Die Wärmeschutzhülse 10 weist an ihrem dem Brennraum 3 abgewandten Ende 13 einen Bund 16 auf. Der Bund 16 erstreckt sich von einem Grundkörper 17 der Wärmeschutzhülse 10 radial nach außen. Der Grundkörper 17 der Wärmeschutzhülse 10 hat im Wesentlichen die Gestalt eines geraden Hohlzylinders. Der Bund 16 hat einen rechteckigen Ringquerschnitt. An ihrem dem Brennraum 3 zugewandten Ende 11 weist die Wärmeschutzhülse 10 einen im Durchmesser verringerten Endabschnitt 18 auf.The heat protection sleeve 10 has a collar 16 on its end 13 facing away from the combustion chamber 3 . The collar 16 extends radially outwards from a base body 17 of the heat protection sleeve 10 . The base body 17 of the heat protection sleeve 10 essentially has the shape of a straight hollow cylinder. The collar 16 has a rectangular annular cross-section. At its end 11 facing the combustion chamber 3 , the heat protection sleeve 10 has an end section 18 with a reduced diameter.

Der im Durchmesser verringerte Endabschnitt 18 dient zur Darstellung der radialen Pressung 12 zwischen der Wärmschutzhülse 10 und der Einspritzdüse 2. Der Bund 16 der Wärmeschutzhülse 10 dient zur Darstellung der axialen Pressung zwischen der Wärmeschutzhülse 10 und dem Dichtring 20.The end section 18 with a reduced diameter serves to represent the radial pressure 12 between the heat protection sleeve 10 and the injection nozzle 2. The collar 16 of the heat protection sleeve 10 serves to represent the axial pressure between the heat protection sleeve 10 and the sealing ring 20.

Das Durchgangsloch 5 im Zylinderkopf 4 begrenzt zusammen mit dem Dichtring 20 radial außen einen Ringraum 19, der radial innen von der Wärmeschutzhülse 10 begrenzt wird. Zum Brennraum 3 hin ist der Ringraum 19 hin offen. An seinem dem Brennraum 3 abgewandten Ende wird der Ringraum 19 von dem Bund 16 der Wärmeschutzhülse 10 begrenzt.The through hole 5 in the cylinder head 4 delimits, together with the sealing ring 20 , an annular space 19 radially on the outside, which is delimited radially on the inside by the heat protection sleeve 10 . The annular space 19 is open toward the combustion chamber 3 . At its end facing away from the combustion chamber 3 , the annular space 19 is delimited by the collar 16 of the heat protection sleeve 10 .

Der Dichtring 20 umfasst einen Grundkörper 21 mit einem rechteckigen Ringquerschnitt. Von dem Grundkörper 21 des Dichtrings 20 erstreckt sich ein Bund 22 radial nach innen. Der Bund 22 des Dichtrings 20 ist in axialer Richtung kraftschlüssig zwischen dem Bund 16 der Wärmeschutzhülse 10 und der Dichtfläche 6 des Zylinderkopfs 4 eingespannt.The sealing ring 20 comprises a base body 21 with a rectangular ring cross section. A collar 22 extends radially inwards from the base body 21 of the sealing ring 20 . The collar 22 of the sealing ring 20 is clamped in a non-positive manner in the axial direction between the collar 16 of the heat protection sleeve 10 and the sealing surface 6 of the cylinder head 4 .

Durch die axiale Pressung 14 wird die Wärmeschutzhülse 10 kraftschlüssig mit dem Dichtring 20 verbunden, der wiederum kraftschlüssig mit dem Zylinderkopf 4 verbunden ist. Dadurch wird ein axialer Pressverband geschaffen, der sicher verhindert, dass Brenngas aus dem Brennraum 3 durch den Ringraum 19 in einen konstruktiv bedingten Ringraum 23 gelangt.Due to the axial pressure 14, the heat protection sleeve 10 is non-positively connected to the sealing ring 20, which in turn is non-positively connected to the cylinder head 4. This creates an axial interference fit that reliably prevents combustion gas from getting out of the combustion chamber 3 through the annular space 19 into an annular space 23 caused by the design.

Der Ringraum 23 wird in den Figuren 1 bis 3 axial unten von dem Bund 22 des Dichtrings 20 begrenzt. Axial oben wird der Ringraum 23 von der Düsenspannmutter 15 begrenzt. Der Ringraum 23 ergibt sich durch ein konstruktiv benötigtes radiales Spiel zwischen dem Bund 16 der Wärmeschutzhülse 10 und dem Grundkörper 21 des Dichtrings 20.The annular space 23 is in the Figures 1 to 3 axially limited by the collar 22 of the sealing ring 20 below. The annular space 23 is delimited axially at the top by the nozzle clamping nut 15 . The annular space 23 results from a structurally required radial play between the collar 16 of the heat insulation sleeve 10 and the base body 21 of the sealing ring 20.

Bei den Injektoranordnungen 31; 41 der Figuren 2 und 3 umfasst die Wärmeschutzhülse 10 einen Hülsenkörper 32, der die Gestalt eines geraden Hohlzylinders hat. Der Hülsenkörper 32 liegt über seine gesamte axiale Abmessung, die auch als Länge bezeichnet wird, mit einer inneren Mantelfläche 33 an einer äußeren Mantelfläche 34 des Düsenkörpers 9 der Einspritzdüse 2 kraftschlüssig an, um die radiale Pressung 12 darzustellen. An seinem dem Brennraum 3 zugewandten Ende 11 weist der Hülsenkörper 32 einen im Durchmesser verringerten Endabschnitt 18 auf.In the injector assemblies 31; 41 of figures 2 and 3 includes the heat protection sleeve 10 a sleeve body 32 which has the shape of a right hollow cylinder. The sleeve body 32 rests over its entire axial dimension, which is also referred to as length, with an inner lateral surface 33 on an outer lateral surface 34 of the nozzle body 9 of the injection nozzle 2 in a non-positive manner in order to produce the radial pressure 12 . At its end 11 facing the combustion chamber 3 , the sleeve body 32 has an end section 18 with a reduced diameter.

Bei der Injektoranordnung 41 in Figur 3 ist der Hülsenkörper 32 im Unterschied zu Figur 2 ohne den im Durchmesser verringerten Endabschnitt 18 ausgeführt. Ansonsten ist die Wärmeschutzhülse 10 in Figur 3 genauso ausgeführt wie in Figur 2.With the injector arrangement 41 in figure 3 is the sleeve body 32 in contrast to figure 2 performed without the reduced diameter end portion 18. Otherwise, the thermal sleeve is 10 in figure 3 done the same as in figure 2 .

Claims (8)

  1. Injector arrangement (1; 31; 41) having an injection nozzle (2) for injecting medium into a combustion chamber (3), in particular for injecting fuel into a combustion chamber (3) of an internal combustion engine, and having a sealing ring (20) which, for the purpose of sealing, is preloaded against a sealing surface (6) of a cylinder head (4), said cylinder head comprising a passage hole (5) through which the injection nozzle (2) projects into the combustion chamber (3) and in which a heat-protection sleeve (10) is arranged between the injection nozzle (2) and the cylinder head (4) in a radial direction, which heat-protection sleeve, by way of an end (11) facing towards the combustion chamber (3), is connected in a force-fitting manner to the injection nozzle (2) by way of a radial press fit (12), characterized in that the heat-protection sleeve (10), by way of an end (13) facing away from the combustion chamber (3), is connected in a force-fitting manner to the sealing ring (20) by way of an axial press fit (14), wherein, at its end (13) facing away from the combustion chamber (3), the heat-protection sleeve (10) has a radially outwardly projecting collar (16) by way of which the heat-protection sleeve (10) is connected in a force-fitting manner to the sealing ring (20), and the sealing ring (20) has a radially inwardly projecting collar (22) which is clamped between the radially outwardly projecting collar (16) of the heat-protection sleeve (10) and the sealing surface (6) of the cylinder head (4) in an axial direction.
  2. Injector arrangement according to Claim 1, characterized in that the heat-protection sleeve (10), together with the sealing ring (20), is preloaded against the sealing surface (6) of the cylinder head (4) in the axial direction.
  3. Injector arrangement according to Claim 1, characterized in that a ring-shaped space (19) formed between the heat-protection sleeve (10) and the cylinder head (4) in the radial direction is, at its end (13) facing away from the combustion chamber (3), delimited in the axial direction by the radially outwardly projecting collar (16) of the heat-protection sleeve (10).
  4. Injector arrangement according to Claim 1, characterized in that an axial dimension of the radially inwardly projecting collar (12) of the sealing ring (20) is at least equal in size to the axial dimension of the radially outwardly projecting collar (16) of the heat-protection sleeve (10).
  5. Injector arrangement according to one of Claims 1, 2 or 4, characterized in that there is an amount of radial play between the radially outwardly projecting collar (16) of the heat-protection sleeve (10) and the sealing ring (20).
  6. Injector arrangement according to one of the preceding claims, characterized in that the heat-protection sleeve (10) comprises a sleeve body (32) having the form of a right hollow cylinder with an inner lateral surface (33), by way of which inner lateral surface the heat-protection sleeve (10) is pressed over its entire axial dimension against an outer lateral surface (34) of the injection nozzle (2) .
  7. Injector arrangement according to one of the preceding claims, characterized in that the heat-protection sleeve (10) and the sealing ring (20) are clamped between the sealing surface (6) of the cylinder head (4) and a nozzle-clamping nut (15) in the axial direction.
  8. Heat-protection sleeve (10) and/or sealing ring (20) for an injector arrangement according to one of the preceding claims.
EP19786771.6A 2018-10-17 2019-10-10 Injector assembly Active EP3867519B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018217768.6A DE102018217768A1 (en) 2018-10-17 2018-10-17 Injector arrangement
PCT/EP2019/077453 WO2020078817A1 (en) 2018-10-17 2019-10-10 Injector arrangement

Publications (2)

Publication Number Publication Date
EP3867519A1 EP3867519A1 (en) 2021-08-25
EP3867519B1 true EP3867519B1 (en) 2022-12-07

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Application Number Title Priority Date Filing Date
EP19786771.6A Active EP3867519B1 (en) 2018-10-17 2019-10-10 Injector assembly

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US (1) US11536234B2 (en)
EP (1) EP3867519B1 (en)
CN (1) CN112912611B (en)
DE (1) DE102018217768A1 (en)
FI (1) FI3867519T3 (en)
WO (1) WO2020078817A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022001464B4 (en) * 2022-04-26 2023-11-02 Deutz Aktiengesellschaft Cylinder head for an internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE2149817B2 (en) * 1971-10-06 1975-08-21 Daimler-Benz Ag, 7000 Stuttgart Arrangement of a fuel injection valve for electronically controlled fuel injection into the intake duct of an internal combustion engine
DE7827497U1 (en) * 1978-09-15 1980-03-06 Robert Bosch Gmbh, 7000 Stuttgart HEAT PROTECTION FOR NOZZLES OF INTERNAL COMBUSTION ENGINES
DE10027669A1 (en) 2000-06-03 2001-12-06 Bosch Gmbh Robert Fixing device for fuel injection valve has at least one sealing element in region of step in bush
US20070113828A1 (en) * 2005-11-22 2007-05-24 Fonville Carl E Fuel injector isolating and sealing member
DE102006049532A1 (en) * 2006-10-20 2008-04-24 Robert Bosch Gmbh Screw connection for fuel injector
WO2012014326A1 (en) * 2010-07-30 2012-02-02 トヨタ自動車 株式会社 Vibration damping insulator for fuel injection valve
AT512667B1 (en) 2012-04-05 2014-03-15 Bosch Gmbh Robert Injection nozzle for injecting media into a combustion chamber
DE102013212321A1 (en) 2013-06-26 2014-12-31 Robert Bosch Gmbh fuel injector
US10036355B2 (en) * 2013-08-08 2018-07-31 Cummins Inc. Heat transferring fuel injector combustion seal with load bearing capability
US9410520B2 (en) * 2013-08-08 2016-08-09 Cummins Inc. Internal combustion engine including an injector combustion seal positioned between a fuel injector and an engine body
DE102013021261A1 (en) 2013-12-14 2015-06-18 Daimler Ag Fuel injection nozzle for an internal combustion engine
AT517054B1 (en) * 2015-04-14 2017-02-15 Ge Jenbacher Gmbh & Co Og Arrangement of a cylinder head and a fuel injector
DE102015215943A1 (en) 2015-08-20 2017-02-23 Robert Bosch Gmbh fuel injector
GB201518531D0 (en) * 2015-10-20 2015-12-02 Delphi Internat Operations Luxembourg S À R L Fuel injector nozzle shield
DE102015223605A1 (en) * 2015-11-27 2017-06-01 Robert Bosch Gmbh Injector arrangement with thermal protection sleeve

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US20210381478A1 (en) 2021-12-09
CN112912611A (en) 2021-06-04
WO2020078817A1 (en) 2020-04-23
DE102018217768A1 (en) 2020-04-23
CN112912611B (en) 2023-11-21
US11536234B2 (en) 2022-12-27
EP3867519A1 (en) 2021-08-25
FI3867519T3 (en) 2023-03-18

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