EP3867519A1 - Injector arrangement - Google Patents

Injector arrangement

Info

Publication number
EP3867519A1
EP3867519A1 EP19786771.6A EP19786771A EP3867519A1 EP 3867519 A1 EP3867519 A1 EP 3867519A1 EP 19786771 A EP19786771 A EP 19786771A EP 3867519 A1 EP3867519 A1 EP 3867519A1
Authority
EP
European Patent Office
Prior art keywords
protection sleeve
heat protection
combustion chamber
sealing ring
injection nozzle
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
EP19786771.6A
Other languages
German (de)
French (fr)
Other versions
EP3867519B1 (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
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 EP3867519A1 publication Critical patent/EP3867519A1/en
Application granted granted Critical
Publication of EP3867519B1 publication Critical patent/EP3867519B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14Arrangements of injectors with respect to engines; Mounting of injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04Injectors with heating, cooling, or thermally-insulating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85Mounting of fuel injection apparatus
    • F02M2200/858Mounting of fuel injection apparatus sealing arrangements between injector and engine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07Nozzles and injectors with controllable fuel supply
    • F02M2700/077Injectors 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 that is biased for sealing against a sealing surface of a cylinder head, which comprises a through hole through which the injection nozzle enters the
  • Combustion chamber protrudes and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is connected non-positively to the injection nozzle by radial pressure at one end facing the combustion chamber.
  • Fuel in the combustion chamber of an internal combustion engine comprising a
  • Nozzle body the nozzle tip having the spray holes in the
  • Injection nozzle in a receiving bore of a holding part in particular
  • Cylinder head is used, the combustion chamber end region of the nozzle body with the interposition of the heat protection sleeve with the
  • the heat protection sleeve has a first and a second region, which are axially spaced from each other, the second region being arranged closer to the nozzle tip than the first region, with a first outer on the outer jacket in the first region
  • Inner jacket are formed a second inner circumferential sealing surface, the second sealing surfaces having a smaller diameter than the first sealing surfaces, the first outer and the second outer sealing surface each sealingly with an annular seat surface running in a radial plane or with a conical seat surface of the receiving bore Cooperate and the first inner and the second inner sealing surface each sealingly cooperate with an annular seat surface running in a radial plane or with a conical seat surface of the nozzle body.
  • EP 3 014 105 Bl is a fuel injector, in particular a
  • Receiving opening of a cylinder head of an internal combustion engine can be used and, in the installed position, has a first region facing a combustion chamber of the internal combustion engine, to which at least a second region of enlarged diameter is connected on the side facing away from the combustion chamber, the first region being made of metal and on which
  • Combustion chamber-facing side is radially surrounded by a first sealing element, which in the annular space between the first region of the
  • Bore section of the receiving bore can be used, and with a second sealing element, which 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 is axially clampable, the first sealing element being axially between the injector housing and a second contact surface
  • Receiving opening can be tensioned 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 on a component in the form of a metal
  • the injector seal arrangement which is positioned between the fuel injector body and the engine cylinder head, wherein the injector seal arrangement is a sealing component formed from a first material, which in a longitudinal between the fuel injector body and the
  • Engine cylinder head sealing surface is positioned to receive a fuel injector clamping force, and has a thermally conductive component, which is formed from a second material that is different from the first material, wherein the second material has a higher thermal conductivity than the first material and wherein the thermally conductive component is positioned radially between the nozzle element housing and the sealing component to transfer heat from 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 biased for sealing against a sealing surface of a cylinder head and which has a through hole by 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 sleeve is connected to the injection nozzle in a force-locking manner with an end facing the combustion chamber by radial pressure.
  • the task is for 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, 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 connected non-positively to the injection nozzle with an end facing the combustion chamber by radial pressure that the heat protection sleeve is non-positively connected to the sealing ring with an end facing away from the combustion chamber by an axial pressure.
  • the injection nozzle is also referred to as an injector and comprises a nozzle body in which one
  • Nozzle needle can be moved back and forth in the direction of a longitudinal axis of the injection nozzle in order to open or close injection openings or injection holes through which a medium under high pressure, such as fuel, can be injected into the combustion chamber.
  • the terms axial and radial refer to the longitudinal axis of the injection nozzle.
  • Axial means in the direction or parallel to the longitudinal axis of the injection nozzle.
  • Radial means transverse to the longitudinal axis of the injection nozzle.
  • the injector arrangement is advantageously used in the operation of modern internal combustion engines for injecting high-pressure fuel, in particular diesel fuel and / or gas, into the combustion chamber.
  • high-pressure fuel in particular diesel fuel and / or gas
  • a preferred embodiment of the injector arrangement is characterized in that the heat protection sleeve is prestressed in the axial direction together with the sealing ring against the sealing surface of the cylinder head. So can An axial pressure between the sealing ring and the cylinder head can be represented via the heat protection sleeve. This further improves the seal against undesired passage of fuel gas from the fuel gas.
  • Another preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve has at its end facing away from the combustion chamber a radially outwardly projecting collar, by means of which the heat protection sleeve is non-positively connected to the sealing ring.
  • Radially outwards means that the collar of the heat protection sleeve is directed away from the longitudinal axis of the injection nozzle. In this way, an axial interference fit between the heat protection sleeve and the sealing ring is created in a simple manner.
  • 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 projecting collar of the heat protection sleeve. This reliably prevents an undesired passage of fuel gas from the combustion chamber at the end of the annular space facing away from the combustion chamber.
  • the annular space is structurally open.
  • Another preferred exemplary embodiment of the injector arrangement is characterized in that the sealing ring has a radially inwardly projecting collar, which extends in the axial direction between the radially outwardly projecting collar of the heat protection sleeve 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 ring cross section. The two collars make it possible to display an axial press fit with the sealing ring and the heat protection sleeve in a simple manner.
  • a further preferred exemplary embodiment of the injector arrangement is characterized in that a radial dimension of the inwardly projecting 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 projecting collar of the sealing ring is advantageously somewhat larger than the radially outwardly projecting collar of the heat protection sleeve.
  • the axial dimension of the entire sealing ring is advantageously a little more than twice as large as the axial dimension of the heat protection sleeve.
  • Another preferred exemplary embodiment of the injector arrangement is characterized in that there is a radial play between the radially outwardly projecting collar of the heat protection sleeve and the sealing ring. As a result, the representation of a radial press fit between the
  • the heat protection sleeve and the injector simplified.
  • 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 circumferential surface, with which the heat protection sleeve is pressed over its entire axial dimension against an outer circumferential surface of the injection nozzle.
  • the entire inner lateral surface of the heat protection sleeve can be used for the heat transfer between the injection nozzle and the heat protection sleeve.
  • Nozzle clamping nut are clamped.
  • 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 clamp 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 further relates to a heat protection sleeve and / or a sealing ring for a previously described injector arrangement.
  • the heat protection sleeve and the sealing ring can be traded separately.
  • the invention also relates to a kit for a preliminary
  • the kit for the injector arrangement advantageously comprises different heat protection sleeves and sealing rings. In this way, the injector arrangement can be easily connected to different ones
  • Installation specifications and / or operating specifications can be adjusted.
  • FIG. 1 shows an injector arrangement with an injection nozzle and with a
  • Heat protection sleeve which is connected to an end facing a combustion chamber by a radial pressure with the injection nozzle, wherein the heat protection sleeve is non-positively connected to an end facing away from the combustion chamber by an axial pressure with a sealing ring, im
  • Figure 2 is a similar representation as in Figure 1 with an optimized
  • FIG. 3 shows a representation similar to that in FIGS. 1 and 2 with a further optimized heat protection sleeve. Description of the embodiments
  • FIG. 1 to 3 is an injector arrangement 1; 31; 41 in three similar versions each shown in longitudinal section.
  • the same reference numerals are used to designate the same or similar parts.
  • the injector arrangement 1; 31; 41 comprises an injection nozzle 2, which projects with a lower end in FIGS.
  • the internal combustion engine comprises a cylinder head 4 with a through hole 5, through which the injection nozzle 2 projects 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 (not visible or not shown) nozzle needle can be moved back and forth in the direction of the longitudinal axis 8 in order to (likewise through holes or not visible or not shown)
  • the structure and the function of the injection nozzle 2 can be similar to that of the fuel injector disclosed in the European patent specification EP 3 014 105 B1 or the injection nozzle described in the Austrian patent specification AT 512 667 B1.
  • 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 good heat-conducting material, 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 to the nozzle body 9 of the injection nozzle 2 at one end 11 facing the combustion chamber 3 by radial pressure 12.
  • the heat protection sleeve 10 is at one
  • the nozzle clamping nut 15 serves, 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 at its end 13 facing away from the combustion chamber 3.
  • the collar 16 extends radially outward from a base body 17 of the heat protection sleeve 10.
  • Heat protection sleeve 10 has essentially the shape of a straight
  • the collar 16 has a rectangular ring cross section.
  • the heat protection sleeve 10 has an end section 18 with a reduced diameter.
  • the reduced diameter end section 18 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 20th
  • the annular space 19 is open towards 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
  • a collar 22 extends radially inward from the base body 21 of the sealing ring 20.
  • the collar 22 of the sealing ring 20 is clamped non-positively in the axial direction between the collar 16 of the heat protection sleeve 10 and the sealing surface 6 of the cylinder head 4. 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.
  • an axial press fit is created which reliably prevents fuel gas from the combustion chamber 3 from reaching the annular space 19 into an annular space 23 which is due to its construction.
  • the annular space 23 is delimited axially at the bottom by the collar 22 of the sealing ring 20 in FIGS. 1 to 3.
  • the annular space 23 is axially above
  • Nozzle clamping nut 15 limited.
  • the annular space 23 results from a structurally required radial play between the collar 16
  • Heat protection sleeve 10 and the base body 21 of the sealing ring 20 are identical to Heat protection sleeve 10 and the base body 21 of the sealing ring 20.
  • Heat protection sleeve 10 a sleeve body 32, which has the shape of a straight hollow cylinder.
  • the sleeve body 32 lies over its entire axial
  • the sleeve body 32 has an im
  • the sleeve body 32 is designed without the end section 18 with reduced diameter. Otherwise, the heat protection sleeve 10 in FIG. 3 is designed in exactly the same way as in FIG. 2.

Landscapes

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

Abstract

The invention relates to an injector arrangement (1) having an injector nozzle (2) for injecting medium into a combustion chamber (3), particularly for injecting fuel into a combustion chamber (3) of an internal combustion engine, and having a sealing ring (20), which is pre-loaded in order to seal against a sealing surface (6) of a cylinder head (4), which comprises a through-hole (5), through which the injection nozzle (2) protrudes into the combustion chamber (3) and in which, in the radial direction between the injection nozzle (2) and the cylinder head (4), a heat protection sleeve (10) is arranged, one end (11) of which, facing the combustion chamber (3), is frictionally connected to the injection nozzle (2) by a radial pressing (12). In order to functionally improve the injector arrangement (1), an end (13) of the heat protection sleeve (10) furthest from the combustion chamber (3) is frictionally connected to the sealing ring (20) by an axial pressing (14).

Description

Beschreibung  description
Titel title
Injektoranordnung  Injector arrangement
Die Erfindung betrifft eine Injektoranordnung mit einer Einspritzdüse, zum The invention relates to an injector arrangement with an injection nozzle for
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 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 that is biased for sealing against a sealing surface of a cylinder head, which comprises a through hole through which the injection nozzle enters the
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. Combustion chamber protrudes and in which a heat protection sleeve is arranged in the radial direction between the injection nozzle and the cylinder head, which is connected non-positively to the injection nozzle by radial pressure at one end facing the combustion chamber.
Stand der Technik State of the art
Aus der österreichischen Patentschrift AT 512 667 Bl ist eine Einspritzdüse zum Einspritzen von Medium in einen Brennraum bekannt, insbesondere von From the Austrian patent AT 512 667 Bl an injection nozzle for injecting medium into a combustion chamber is known, in particular from
Kraftstoff in den Brennraum einer Brennkraftmaschine, umfassend einen Fuel in the combustion chamber of an internal combustion engine, comprising a
Düsenkörper, dessen die Spritzlöcher aufweisende Düsenspitze in den Nozzle body, the nozzle tip having the spray holes in the
Brennraum hineinragt, eine im brennraumseitigen Endbereich des Düsenkörpers angeordnete Wärmeschutzhülse, die den Düsenkörper umgibt, wobei die Comes into the combustion chamber, a heat protection sleeve arranged in the end region of the nozzle body on the combustion chamber, which surrounds the nozzle body, the
Einspritzdüse in eine Aufnahmebohrung eines Halteteils, insbesondere Injection nozzle in a receiving bore of a holding part, in particular
Zylinderkopfes, eingesetzt ist, wobei der brennraumseitige Endbereich des Düsenkörpers unter Zwischenschaltung der Wärmeschutzhülse mit der Cylinder head is used, the combustion chamber end region of the nozzle body with the interposition of the heat protection sleeve with the
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 Receiving hole cooperates, wherein the heat protection sleeve has a first and a second region, which are axially spaced from each other, the second region being arranged closer to the nozzle tip than the first region, with a first outer on the outer jacket in the first region
umfangsmäßige Dichtfläche und am Innenmantel eine erste innere umfangsmäßige Dichtfläche ausgebildet sind und im zweiten Bereich am circumferential sealing surface and on the inner jacket a first inner circumferential sealing surface are formed and in the second area
Außenmantel eine zweite äußere umfangsmäßige Dichtfläche und am Outer jacket a second outer circumferential sealing surface and on
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 Bl ist ein Kraftstoffinjektor, insbesondere ein Inner jacket are formed a second inner circumferential sealing surface, the second sealing surfaces having a smaller diameter than the first sealing surfaces, the first outer and the second outer sealing surface each sealingly with an annular seat surface running in a radial plane or with a conical seat surface of the receiving bore Cooperate and the first inner and the second inner sealing surface each sealingly cooperate with an annular seat surface running in a radial plane or with a conical seat surface of the nozzle body. From the European patent EP 3 014 105 Bl is a fuel injector, in particular a
Common-Rail-Injektor, bekannt, mit einem Injektorgehäuse, das in eine Common rail injector, known, with an injector housing that in a
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 Receiving opening of a cylinder head of an internal combustion engine can be used and, in the installed position, has a first region facing a combustion chamber of the internal combustion engine, to which at least a second region of enlarged diameter is connected on the side facing away from the combustion chamber, the first region being made of metal and on which
Brennraum zugewandten Seite radial von einem ersten Dichtelement umgeben ist, das in den ringförmigen Raum zwischen dem ersten Bereich des Combustion chamber-facing side is radially surrounded by a first sealing element, which in the annular space between the first region of the
Injektorgehäuses und der Aufnahmeöffnung im Bereich eines ersten Injector housing and the receiving opening in the area of a first
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 Bore section of the receiving bore can be used, and with a second sealing element, which on the side facing away from the combustion chamber between the injector housing and a contact surface of the receiving opening for the
Injektorgehäuse axial verspannbar ist, wobei das erste Dichtelement axial zwischen dem Injektorgehäuse und einer zweiten Anlagefläche der Injector housing is axially clampable, the first sealing element being axially between the injector housing and a second contact surface
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 Receiving opening can be tensioned 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 on a component in the form of a metal
bestehenden Dichthülse ausgebildet sind, so dass die Dichthülse auf der dem Brennraum zugewandten Stirnseite einen konisch ausgebildeten ersten existing sealing sleeve are formed so that the sealing sleeve on the end facing the combustion chamber a conical first
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 Has sealing area as the first sealing element, while the flange-shaped peripheral 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 der International publication WO 2015/020790 discloses an internal combustion engine with a fuel injector arrangement for mounting in an engine cylinder head, comprising: an engine cylinder head sealing surface, a fuel injector body, which has a longitudinal axis
Düsenelementgehäuse und einen Düsenhalter aufweist; und eine Has nozzle element housing and a nozzle holder; and a
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 The injector seal arrangement, which is positioned between the fuel injector body and the engine cylinder head, wherein the injector seal arrangement is a sealing component formed from a first material, which in a longitudinal between the fuel injector body and the
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. Engine cylinder head sealing surface is positioned to receive a fuel injector clamping force, and has a thermally conductive component, which is formed from a second material that is different from the first material, wherein the second material has a higher thermal conductivity than the first material and wherein the thermally conductive component is positioned radially between the nozzle element housing and the sealing component to transfer heat from the nozzle element housing to the sealing component.
Offenbarung der Erfindung Disclosure of the 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 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 biased for sealing against a sealing surface of a cylinder head and which has a through hole by which the
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. 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 sleeve is connected to the injection nozzle in a force-locking manner with an end facing the combustion chamber by radial pressure.
Die Aufgabe ist bei einer Injektoranordnung mit einer Einspritzdüse, zum The task is for an injector arrangement with an injection nozzle for
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 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, 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 connected non-positively to the injection nozzle with an end facing the combustion chamber by radial pressure that the heat protection sleeve is non-positively connected to the sealing ring with an end facing away from the combustion chamber by an axial pressure. The injection nozzle is also referred to as an injector and comprises a nozzle body in which one
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 Nozzle needle can be moved back and forth in the direction of a longitudinal axis of the injection nozzle in order to open or close injection openings or injection holes through which a medium under high pressure, such as fuel, can be injected into the combustion chamber. The terms axial and radial refer to the longitudinal axis of the injection nozzle. Axial means in the direction or parallel to the longitudinal axis of the injection nozzle. Radial means transverse to the longitudinal axis of the injection nozzle. The injector arrangement is advantageously used in the operation of modern internal combustion engines for injecting high-pressure fuel, in particular diesel fuel and / or gas, into the combustion chamber. In the context of the present invention
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 Tests and examinations carried out have found that, in a conventional injector arrangement, fuel gas 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 combustion chamber facing away from the combustion chamber
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. Can lick heat protection sleeve. 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 chamber, 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 fuel gas between the heat protection sleeve and the sealing ring can be reliably prevented. In this way, in addition to the known heat dissipation function, a sealing function can be implemented with the heat protection sleeve.
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 embodiment of the injector arrangement is characterized in that the heat protection sleeve is prestressed in the axial direction together with the sealing ring against the sealing surface of the cylinder head. So can An axial pressure between the sealing ring and the cylinder head can be represented via the heat protection sleeve. This further improves the seal against undesired passage of fuel gas from the fuel gas.
Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass die Wärmeschutzhülse an ihrem dem Brennraum abgewandten Ende einen radial nach außen abstehenden Bund aufweist, durch den die Wärmeschutzhülse kraftschlüssig mit dem Dichtring verbunden ist.Another preferred exemplary embodiment of the injector arrangement is characterized in that the heat protection sleeve has at its end facing away from the combustion chamber a radially outwardly projecting collar, by means of which the heat protection sleeve is non-positively connected to the sealing ring.
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. Radially outwards means that the collar of the heat protection sleeve is directed away from the longitudinal axis of the injection nozzle. In this way, an axial interference fit between the heat protection sleeve and the sealing ring is created in a simple manner.
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 projecting collar of the heat protection sleeve. This reliably prevents an undesired passage of fuel gas from the combustion chamber at the end of the annular space facing away from the combustion chamber. At its end facing the combustion chamber, the annular space is structurally open.
Ein weiteres bevorzugtes Ausführungsbeispiel der Injektoranordnung ist dadurch gekennzeichnet, dass der Dichtring einen radial nach innen abstehenden Bund aufweist, der in axialer Richtung zwischen dem radial nach außen abstehenden Bund der Wärmeschutzhülse und der Dichtfläche des Zylinderkopfes Another preferred exemplary embodiment of the injector arrangement is characterized in that the sealing ring has a radially inwardly projecting collar, which extends in the axial direction between the radially outwardly projecting collar of the heat protection sleeve and the sealing surface of the cylinder head
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. 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. is clamped. 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 ring cross section. The two collars make it possible to display an axial press fit with the sealing ring and the heat protection sleeve in a simple manner. A further preferred exemplary embodiment of the injector arrangement is characterized in that a radial dimension of the inwardly projecting 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 projecting collar of the sealing ring is advantageously somewhat larger than the radially outwardly projecting collar of the heat protection sleeve. The axial dimension of the entire sealing ring is advantageously a little more than twice as large as 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 Another preferred exemplary embodiment of the injector arrangement is characterized in that there is a radial play between the radially outwardly projecting collar of the heat protection sleeve and the sealing ring. As a result, the representation of a radial press fit between the
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. Heat protection sleeve and the injector simplified. 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 circumferential surface, with which the heat protection sleeve is pressed over its entire axial dimension against an outer circumferential surface of the injection nozzle. This ensures an extremely stable radial press 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 the 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 Another preferred embodiment of the injector arrangement is characterized in that the heat protection sleeve and the sealing ring in the axial direction between the sealing surface of the cylinder head and one
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 Düsenspannmuter eingespannt. Die Düsenspannmuter dient in an sich bekannter Art und Weise dazu, die Einspritzdüse in dem Zylinderkopf zu montieren. Nozzle clamping nut are clamped. 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 clamp 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 further relates to a heat protection sleeve and / or a sealing ring for a previously described injector arrangement. The heat protection sleeve and the sealing ring can be traded separately.
Die Erfindung betrifft darüber hinaus einen Baukasten für eine vorab The invention also relates to a kit for a preliminary
beschriebene Injektoranordnung. Der Baukasten für die Injektoranordnung umfasst vorteilhaft unterschiedliche Wärmeschutzhülsen und Dichtringe. So kann die Injektoranordnung auf einfache Art und Weise an unterschiedliche described injector arrangement. The kit for the injector arrangement advantageously comprises different heat protection sleeves and sealing rings. In this way, the injector arrangement can be easily connected to different ones
Einbauvorgaben und/oder Betriebsvorgaben angepasst werden. Installation specifications and / or operating specifications can be adjusted.
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 emerge from the following description in which various exemplary embodiments are described in detail with reference to the drawing.
Kurze Beschreibung der Zeichnung Brief description of the drawing
Es zeigen: Show it:
Figur 1 eine Injektoranordnung mit einer Einspritzdüse und mit einer 1 shows an injector arrangement with an injection nozzle and with a
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 Heat protection sleeve, which is connected to an end facing a combustion chamber by a radial pressure with the injection nozzle, wherein the heat protection sleeve is non-positively connected to an end facing away from the combustion chamber by an axial pressure with a sealing ring, im
Längsschnit; Longitudinal cut;
Figur 2 eine ähnliche Darstellung wie in Figur 1 mit einer optimierten Figure 2 is a similar representation as in Figure 1 with an optimized
Wärmeschutzhülse; und Heat protection sleeve; and
Figur 3 eine ähnliche Darstellung wie in den Figuren 1 und 2 mit einer weiter optimierten Wärmeschutzhülse. Beschreibung der Ausführungsbeispiele 3 shows a representation similar to that in FIGS. 1 and 2 with a further optimized heat protection sleeve. Description of the 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 Figures 1 to 3 is an injector arrangement 1; 31; 41 in three similar versions each shown in longitudinal section. The same reference numerals are used to designate the same or similar parts. First, the similarities of the embodiments are described. The differences between the individual embodiments are then 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 arrangement 1; 31; 41 comprises an injection nozzle 2, which projects with a lower end in FIGS. The internal combustion engine comprises a cylinder head 4 with a through hole 5, through which the injection nozzle 2 projects 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 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 (not visible or not shown) nozzle needle can be moved back and forth in the direction of the longitudinal axis 8 in order to (likewise through holes or not visible or not shown)
Durchtrittsöffnungen für Kraftstoff in dem Düsenkörper 9 freizugeben oder zu verschließen. Open or close passage openings for fuel in the nozzle body 9.
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 Bl offenbarten Kraftstoffinjektor oder der in der österreichischen Patentschrift AT 512 667 Bl beschriebenen Einspritzdüse. The structure and the function of the injection nozzle 2 can be similar to that of the fuel injector disclosed in the European patent specification EP 3 014 105 B1 or the injection nozzle described in the Austrian patent specification AT 512 667 B1.
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. 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 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 good heat-conducting material, 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 to the nozzle body 9 of the injection nozzle 2 at one end 11 facing the combustion chamber 3 by radial pressure 12. The heat protection sleeve 10 is at one
Brennraum 3 abgewandten Ende 13 durch eine axiale Pressung 14 End 13 facing away from combustion chamber 3 by axial pressure 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. non-positively connected to a nozzle clamping nut 15 and a sealing ring 20. The sealing ring 20 is in turn non-positively connected to the cylinder head 4. The nozzle clamping nut 15 serves, 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 The heat protection sleeve 10 has a collar 16 at its end 13 facing away from the combustion chamber 3. The collar 16 extends radially outward from a base body 17 of the heat protection sleeve 10. The base body 17 of the
Wärmeschutzhülse 10 hat im Wesentlichen die Gestalt eines geraden Heat protection sleeve 10 has essentially the shape of a straight
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. Hollow cylinder. The collar 16 has a rectangular ring 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 reduced diameter end section 18 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 20th
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, together with the sealing ring 20, delimits 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 towards 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 The sealing ring 20 comprises a base body 21 with a rectangular
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. 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. Ring cross-section. A collar 22 extends radially inward from the base body 21 of the sealing ring 20. The collar 22 of the sealing ring 20 is clamped non-positively in the axial direction between the collar 16 of the heat protection sleeve 10 and the sealing surface 6 of the cylinder head 4. 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. As a result, an axial press fit is created which reliably prevents fuel gas from the combustion chamber 3 from reaching the annular space 19 into an annular space 23 which is due to its construction.
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 The annular space 23 is delimited axially at the bottom by the collar 22 of the sealing ring 20 in FIGS. 1 to 3. The annular space 23 is axially above
Düsenspannmutter 15 begrenzt. Der Ringraum 23 ergibt sich durch ein konstruktiv benötigtes radiales Spiel zwischen dem Bund 16 der Nozzle clamping nut 15 limited. The annular space 23 results from a structurally required radial play between the collar 16
Wärmeschutzhülse 10 und dem Grundkörper 21 des Dichtrings 20.  Heat protection sleeve 10 and the base body 21 of the sealing ring 20.
Bei den Injektoranordnungen 31; 41 der Figuren 2 und 3 umfasst die In the injector arrangements 31; 41 of Figures 2 and 3 includes the
Wärmeschutzhülse 10 einen Hülsenkörper 32, der die Gestalt eines geraden Hohlzylinders hat. Der Hülsenkörper 32 liegt über seine gesamte axiale Heat protection sleeve 10 a sleeve body 32, which has the shape of a straight hollow cylinder. The sleeve body 32 lies over its entire axial
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  Dimension, which is also referred to as length, with an inner circumferential surface 33 on an outer circumferential surface 34 of the nozzle body 9 of the injection nozzle 2 in a force-fitting manner in order to represent the radial pressure 12. At its end 11 facing the combustion chamber 3, the sleeve body 32 has an im
Durchmesser verringerten Endabschnitt 18 auf. Reduced diameter end portion 18.
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. In the injector arrangement 41 in FIG. 3, in contrast to FIG. 2, the sleeve body 32 is designed without the end section 18 with reduced diameter. Otherwise, the heat protection sleeve 10 in FIG. 3 is designed in exactly the same way as in FIG. 2.

Claims

Ansprüche Expectations
1. Injektoranordnung (1;31;41) mit einer Einspritzdüse (2), zum Einspritzen von Medium in einen Brennraum (3), insbesondere zum Einspritzen von Kraftstoff in einen Brennraum (3) einer Brennkraftmaschine, und mit einem Dichtring (20), der zur Abdichtung gegen eine Dichtfläche (6) eines Zylinderkopfes (4) vorgespannt ist, der ein Durchgangsloch (5) umfasst, durch welches die Einspritzdüse (2) in den Brennraum (3) ragt und in welchem in radialer Richtung zwischen der Einspritzdüse (2) und dem Zylinderkopf (4) eine Wärmeschutzhülse (10) angeordnet ist, die mit einem dem Brennraum (3) zugewandten Ende (11) durch eine radiale Pressung (12) kraftschlüssig mit der Einspritzdüse (2) verbunden ist, dadurch gekennzeichnet, dass die Wärmschutzhülse (10) mit einem dem Brennraum (3) abgewandten Ende (13) durch eine axiale Pressung (14) kraftschlüssig mit dem Dichtring (20) verbunden ist. 1. injector arrangement (1; 31; 41) with 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 with a sealing ring (20), which is prestressed for sealing against a sealing surface (6) of a cylinder head (4), which comprises a through hole (5) through which the injection nozzle (2) protrudes into the combustion chamber (3) and in which there is a radial direction between the injection nozzle (2 ) and the cylinder head (4) a heat protection sleeve (10) is arranged, which is non-positively connected to the injection nozzle (2) with an end (11) facing the combustion chamber (3) by a radial pressure (12), characterized in that the Heat protection sleeve (10) with an end (13) facing away from the combustion chamber (3) is non-positively connected to the sealing ring (20) by an axial pressure (14).
2. Injektoranordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Wärmeschutzhülse (10) in axialer Richtung zusammen mit dem Dichtring (20) gegen die Dichtfläche (6) des Zylinderkopfes (4) vorgespannt ist.  2. Injector arrangement according to claim 1, characterized in that the heat protection sleeve (10) is biased in the axial direction together with the sealing ring (20) against the sealing surface (6) of the cylinder head (4).
3. Injektoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmeschutzhülse (10) an ihrem dem Brennraum (3) abgewandten Ende (13) einen radial nach außen abstehenden Bund (16) aufweist, durch den die Wärmeschutzhülse (10) kraftschlüssig mit dem Dichtring (20) verbunden ist.  3. Injector arrangement according to one of the preceding claims, characterized in that the heat protection sleeve (10) at its end facing away from the combustion chamber (3) (13) has a radially outwardly projecting collar (16) through which the heat protection sleeve (10) is non-positively connected the sealing ring (20) is connected.
4. Injektoranordnung nach Anspruch 3, dadurch gekennzeichnet, dass ein Ringraum (19), der in radialer Richtung zwischen der Wärmeschutzhülse (10) und dem Zylinderkopf (4) ausgebildet ist, an seinem dem Brennraum (3) abgewandten Ende (13) in axialer Richtung von dem radial nach außen abstehenden Bund (16) der Wärmeschutzhülse (10) begrenzt ist.  4. Injector arrangement according to claim 3, characterized in that an annular space (19), which is formed in the radial direction between the heat protection sleeve (10) and the cylinder head (4), at its end facing away from the combustion chamber (3) (13) in the axial direction Direction of the radially outwardly projecting collar (16) of the heat protection sleeve (10) is limited.
5. Injektoranordnung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Dichtring (20) einen radial nach innen abstehenden Bund (22) aufweist, der in axialer Richtung zwischen dem radial nach außen abstehenden Bund (16) der Wärmeschutzhülse (10) und der Dichtfläche (6) des Zylinderkopfes (4) eingespannt ist. 5. Injector arrangement according to claim 3 or 4, characterized in that the sealing ring (20) has a radially inwardly projecting collar (22) in the axial direction between the radially outwardly projecting collar (16) the heat protection sleeve (10) and the sealing surface (6) of the cylinder head (4) is clamped.
6. Injektoranordnung nach Anspruch 5, dadurch gekennzeichnet, dass eine axiale Abmessung des radial nach innen abstehenden Bundes (12) des Dichtrings (20) mindestens genauso große wie die axiale Abmessung des radial nach außen abstehenden Bundes (16) der Wärmeschutzhülse (10) ist. 6. Injector arrangement according to claim 5, characterized in that an axial dimension of the radially inwardly projecting collar (12) of the sealing ring (20) is at least as large as the axial dimension of the radially outwardly projecting collar (16) of the heat protection sleeve (10) .
7. Injektoranordnung nach einem der Ansprüche 3 bis 6, dadurch 7. Injector arrangement according to one of claims 3 to 6, characterized
gekennzeichnet, dass zwischen dem radial nach außen abstehenden Bund (16) der Wärmeschutzhülse (10) und dem Dichtring (20) ein radiales Spiel vorhanden ist.  characterized in that there is a radial play between the radially outwardly projecting collar (16) of the heat protection sleeve (10) and the sealing ring (20).
8. Injektoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmeschutzhülse (10) einen Hülsenkörper (32) umfasst, der die Gestalt eines geraden Hohlzylinders mit einer inneren Mantelfläche (33) aufweist, mit welcher die Wärmeschutzhülse (10) über ihre gesamte axiale Abmessung gegen eine äußere Mantelfläche (34) der Einspritzdüse (2) gepresst ist.  8. Injector arrangement according to one of the preceding claims, characterized in that the heat protection sleeve (10) comprises a sleeve body (32) which has the shape of a straight hollow cylinder with an inner lateral surface (33) with which the heat protection sleeve (10) over its entire axial dimension is pressed against an outer circumferential surface (34) of the injection nozzle (2).
9. Injektoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmeschutzhülse (10) und der Dichtring (20) in axialer Richtung zwischen der Dichtfläche (6) des Zylinderkopfes (4) und einer Düsenspannmutter (15) eingespannt sind.  9. Injector arrangement according to one of the preceding claims, characterized in that the heat protection sleeve (10) and the sealing ring (20) are clamped in the axial direction between the sealing surface (6) of the cylinder head (4) and a nozzle clamping nut (15).
10. Wärmeschutzhülse (10) und/oder Dichtring (20) für eine I  10. Heat protection sleeve (10) and / or sealing ring (20) for an I
njektoranordnung nach einem der vorhergehenden Ansprüche.  Projector 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

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

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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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DE102022001464B4 (en) * 2022-04-26 2023-11-02 Deutz Aktiengesellschaft Cylinder head for an internal combustion engine

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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
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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
EP3867519B1 (en) 2022-12-07
FI3867519T3 (en) 2023-03-18

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