EP3867519B1 - Injektoranordnung - Google Patents

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

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19786771.6A 2018-10-17 2019-10-10 Injektoranordnung Active EP3867519B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=68233997

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19786771.6A Active EP3867519B1 (de) 2018-10-17 2019-10-10 Injektoranordnung

Country Status (6)

Country Link
US (1) US11536234B2 (zh)
EP (1) EP3867519B1 (zh)
CN (1) CN112912611B (zh)
DE (1) DE102018217768A1 (zh)
FI (1) FI3867519T3 (zh)
WO (1) WO2020078817A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022001464B4 (de) * 2022-04-26 2023-11-02 Deutz Aktiengesellschaft Zylinderkopf für eine Brennkraftmaschine

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2149817B2 (de) * 1971-10-06 1975-08-21 Daimler-Benz Ag, 7000 Stuttgart Anordnung eines Kraftstoffeinspritzventils zur elektronisch gesteuerten Benzineinspritzung in den Ansaugkanal einer Brennkraftmaschine
DE7827497U1 (de) * 1978-09-15 1980-03-06 Robert Bosch Gmbh, 7000 Stuttgart Waermeschutz fuer duesen von brennkraftmaschinen
DE10027669A1 (de) * 2000-06-03 2001-12-06 Bosch Gmbh Robert Befestigungsmittel für ein Brennstoffeinspritzventil
US20070113828A1 (en) * 2005-11-22 2007-05-24 Fonville Carl E Fuel injector isolating and sealing member
DE102006049532A1 (de) * 2006-10-20 2008-04-24 Robert Bosch Gmbh Schraubverbindung für Kraftstoffinjektor
JP5400965B2 (ja) * 2010-07-30 2014-01-29 トヨタ自動車株式会社 燃料噴射弁用制振インシュレータ
AT512667B1 (de) 2012-04-05 2014-03-15 Bosch Gmbh Robert Einspritzdüse zum Einspritzen von Medien in einen Brennraum
DE102013212321A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Kraftstoffinjektor
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
US10036355B2 (en) * 2013-08-08 2018-07-31 Cummins Inc. Heat transferring fuel injector combustion seal with load bearing capability
DE102013021261A1 (de) * 2013-12-14 2015-06-18 Daimler Ag Kraftstoff-Einspritzdüse für eine Brennkraftmaschine
AT517054B1 (de) * 2015-04-14 2017-02-15 Ge Jenbacher Gmbh & Co Og Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor
DE102015215943A1 (de) * 2015-08-20 2017-02-23 Robert Bosch Gmbh Kraftstoffinjektor
GB201518531D0 (en) * 2015-10-20 2015-12-02 Delphi Internat Operations Luxembourg S À R L Fuel injector nozzle shield
DE102015223605A1 (de) * 2015-11-27 2017-06-01 Robert Bosch Gmbh Injektoranordnung mit Thermoschutzhülse

Also Published As

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

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