EP0941399B1 - Gaine de protection thermique - Google Patents

Gaine de protection thermique Download PDF

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Publication number
EP0941399B1
EP0941399B1 EP98943654A EP98943654A EP0941399B1 EP 0941399 B1 EP0941399 B1 EP 0941399B1 EP 98943654 A EP98943654 A EP 98943654A EP 98943654 A EP98943654 A EP 98943654A EP 0941399 B1 EP0941399 B1 EP 0941399B1
Authority
EP
European Patent Office
Prior art keywords
heat protection
jacket
folded
nozzle body
ply
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.)
Expired - Lifetime
Application number
EP98943654A
Other languages
German (de)
English (en)
Other versions
EP0941399A1 (fr
Inventor
Ralf Trutschel
Guido Pilgram
Rainer Norgauer
Christian Preussner
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 EP0941399A1 publication Critical patent/EP0941399A1/fr
Application granted granted Critical
Publication of EP0941399B1 publication Critical patent/EP0941399B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means

Definitions

  • the invention relates to a heat protection sleeve for a in a receiving bore Cylinder head of an internal combustion engine fuel injector for direct injection of fuel into the combustion chamber of the internal combustion engine, especially for a gasoline direct injection valve or diesel direct injection valve.
  • the invention relates to a heat protection sleeve according to the genus Main claim. It is already known from DE 30 00 061 C2, a heat protection sleeve to provide on the nozzle body of a fuel injector. A flange of the Heat protection sleeve is inserted into an inner groove of the fuel injector and sealed against the receiving bore of the cylinder head by means of a sealing ring. At the on the spray-side end, the heat protection sleeve has an annular, inward curved collar on which an elastic heat protection ring is supported. The Heat protection ring is between the spray-side end of the nozzle body Fuel injector and the annular, inwardly curved collar of the Heat protection sleeve arranged.
  • a fuel injector known from GB-PS 759 524 there is a between one End face of the nozzle body and a collar of a clamping nut flexible heat protection element as a disc-shaped heat protection ring from one heat insulating material formed.
  • this inside is made from a thin one Sheet metal shaped ring edged with a U-shaped cross section.
  • a disadvantage of the generic heat protection sleeve is that it has a relatively large size Assembly effort required because the heat protection sleeve on the fuel injector must be pre-assembled. Furthermore, for sealing the receiving bore of the Cylinder head against the combustion gases requires an additional sealing ring, whereby the manufacturing and assembly effort and not least the cost increases becomes. A removal of the on the nozzle body due to the combustion of the Heat generated by the internal combustion engine via the heat protection sleeve Cylinder head is only limited in the known design of the heat protection sleeve possible.
  • DE 195 46 134 C1 is already one Fuel injector for internal combustion engines known a nozzle body and at the combustion chamber end of the Nozzle body has a sleeve.
  • the sleeve is plastic deformable so that when Temperature increases the contact area between the sleeve and reduced the nozzle body.
  • An essential task is that the fuel spray to be sprayed only is loaded with so much heat that no solid Deposits form in the nozzle line area and none Steam bubbles arise. The heat should not go through Conversion of high quality mechanical energy (Fuel pump), but from an inevitable Heat transfer of the combustion gases to the combustion chamber Nozzle body can be obtained.
  • the nozzle body projects together with the Sleeve without wall contact to the cylinder head in the combustion chamber into it.
  • the flanges at the ends of the Sleeve only have fastening functions and none Heat coupling function towards the cylinder head.
  • the heat protection sleeve according to the invention with the characterizing features of The main claim has the advantage that the assembly is considerably easier becomes.
  • the heat protection sleeve according to the invention is shown in FIG this area radially elastic.
  • the heat protection sleeve is therefore in the range of the folded section both on the nozzle body of the fuel injector and also elastically on the mounting hole of the cylinder head.
  • a conical Section of the heat protection sleeve which on a tapered section of the Nozzle body is tight, an axial power transmission from the nozzle body Fuel injector on the heat protection sleeve allows.
  • Through the conical Training ensures self-centering. Furthermore, the conical Training during assembly a certain expansion of the radially elastic, folded Section so that the axial mounting force is reduced.
  • the folded section ensures due to its close contact both on the Nozzle body as well as on the location hole for the fuel injector adequate sealing of the mounting hole of the cylinder head against that in the Combustion chamber of the internal combustion engine. An additional one Sealing ring is not required for sealing. Due to the elastic system of the folded section both on the nozzle body of the fuel injector and there is good heat coupling at the mounting hole of the cylinder head reached between the nozzle body of the fuel injector and the cylinder head, which counteracts overheating of the nozzle body.
  • the measures listed in the subclaims are advantageous Developments and improvements to those specified in the main claim Heat protection sleeve possible. If between an inner layer and an outer layer a gap is formed in the folded section, there is a particularly high radial Elasticity of the folded section.
  • the folded section can have a cross-section Be U-shaped. If the folded section immediately adjoins the conical Connects section of the sleeve body, there is a particularly effective Widening of the folded section when assembling the fuel injector.
  • the sleeve body has a hollow cylindrical section
  • the inside diameter is larger than the outside diameter of the mounted one State inserted in the hollow cylindrical portion of the section Nozzle body in this area there is sufficient play between the Nozzle body of the fuel injector and the receiving bore in the Cylinder head.
  • a collar formed on the end opposite the spray end results in a stop of the heat protection sleeve on a step as a step hole trained receiving bore of the cylinder head, which the final assembly position of the Defines fuel injector in the heat protection sleeve.
  • the sleeve body and the Collars can preferably be designed as a one-piece, deep-drawn sheet metal part, which is particularly inexpensive to manufacture.
  • the flipped section is by crimping or bending can also be produced inexpensively.
  • a cylinder head 1 of an internal combustion engine is partially cut shown.
  • the cylinder head 1 is formed as a stepped bore
  • Receiving hole 2 is formed, which is symmetrical to a combustion chamber 3 Longitudinal axis 4 extends.
  • a Fuel injector 5 used in the receiving bore 2 of the cylinder head 1 .
  • the fuel injector 5 is used for direct Injecting fuel, e.g. B. gasoline or diesel fuel, in the combustion chamber 3 of Internal combustion engine.
  • the fuel injector 5 is preferably an electrical one Connection cable 6 can be actuated electromagnetically. The fuel comes over you Fuel inlet nozzle 7 into the fuel injection valve 5.
  • the fuel injection valve 5 On his injection-side end 8, the fuel injection valve 5 has a nozzle body 9, the one or more spray openings for injecting the fuel into the combustion chamber 3 the internal combustion engine. On the nozzle body 9 is in the direction of spray-side end 8 tapered, conical section 10 is formed.
  • the heat protection sleeve 11 is divided into an essentially axial to the longitudinal axis 4 extending sleeve body 12 and one preferably radially to the Longitudinal axis 4 of the sleeve body 12 outwardly projecting upper collar 13.
  • Der Sleeve body 12 and the collar 13 can as a circumferential, in the circumferential direction completely closed body.
  • the collar 13 is supported on a first step 14 which is designed as a step hole Location hole 2 of the cylinder head 1 and thus defines the insertion depth of the Sleeve body 12 in a between the first stage 14 and a second closer to Combustion chamber 3 lying stage 15 of the receiving bore 2 formed as a stepped bore extending portion 16 of the receiving bore 2 fixed.
  • the section 16 can a section 17 tapering in the direction of the combustion chamber 3 near the step 14 have, whereby the insertion of the heat protection sleeve 11 and the nozzle body 9 of the Fuel injector 5 is facilitated.
  • the sleeve body 12 has one on its spray-side end 18 two-layered, folded section 19.
  • the folded section is e.g. B. can be produced by bending or flanging. Furthermore, one is moving towards that spray-side end 18 tapered, conical section 20 is provided which in mounted condition on the tapered, conical section 10 of the nozzle body 9 of the fuel injector 5 is tight.
  • Fig. 2 shows the area II in Fig. 1 enlarged.
  • already elements described are provided with the same reference numerals, so that as far as a repetitive description is unnecessary.
  • the folded section 19 is in the illustrated embodiment on the injection-side end 18 of the sleeve body 12 bent into a U shape, so that the Sleeve body 12 is formed in two layers in the region of the folded section 19.
  • an inner layer 30 rests elastically close to the nozzle body 9 while an outer layer 31 of the preferably outwardly folded section 19 on the Location bore 2 of the cylinder head 1 rests elastically tight. Because of the narrow system the inner layer 30 on the nozzle body 9 and the outer layer 31 on the Receiving hole 2 is a good heat coupling of the nozzle body 9 with the Cylinder head 1 achieved in this area and overheating upstream regions of the fuel injection valve 5 remote from the combustion chamber 3 counteracted. There is preferably between the inner layer 30 and the outer layer 31 of the folded section 19 a gap 32 is formed, whereby the radial elasticity of the folded section 19 is further improved.
  • a distance marked with a is provided between the spray-side end 18 of the sleeve body 12 and the second stage 15 which is designed as a stepped bore receiving bore 2 of the cylinder head 1 so that the Final assembly position of the heat protection sleeve 11 in the receiving bore 2 through the Stop of the collar 13 on the first stage 14 of the receiving bore 2 in a clear Way is set.
  • the Final assembly position by a stop of the spray end 18 of the Sleeve body 12 is predetermined at the second stage 15 of the receiving bore 2.
  • the Collar 13 can then be omitted.
  • the Sleeve body 12 tapered, conical section 20 on which also tapered, conical section 10 of the nozzle body 9 in the shown in Fig. 2 assembled condition.
  • the conical section 20 is preferably immediately adjacent to the folded, two-layer section 19 arranged so that a during assembly slight elastic expansion of the folded portion 19 is effected, whereby the axial assembly force is reduced.
  • the folded section 19 is preferably made of Metal is formed, this is formed by the folded portion 19 seal in Also compared to a sealing ring made of a rubber-elastic material extremely heat-resistant.
  • the sleeve body 12 preferably has that on the folded section 19 Side of the conical section 20 on a hollow cylindrical section 33.
  • the hollow cylindrical one Section 33 on the nozzle body 9 of the fuel injection valve 5 is not tight and flush but is spaced from the nozzle body 9 by an annular gap 34.
  • the gap 34 arises because the hollow cylindrical section 33 has an inner diameter D which is dimensioned larger than the outer diameter d of that hollow cylindrical portion 33 enclosed area of the nozzle body 9.
  • Der hollow cylindrical section 33 can on the receiving bore 2 of the cylinder head 1st fit flush.
  • the sleeve body 12 can together with the collar 13 as a one-piece sheet metal part be trained.
  • the heat protection sleeve 11 according to the invention can therefore by Deep drawing or rolling in an inexpensive, fully or partially automatic Manufacturing processes are manufactured.
  • a complex pre-assembly of the Heat protection sleeve 11 according to the invention on the fuel injection valve 5 is not required.
  • either the heat protection sleeve 11 on the Nozzle body 9 of fuel injector 5 at least partially pushed on and the Unit of fuel injector 5 and heat protection sleeve 11 is in the Receiving hole 2 inserted or the heat protection sleeve 11 is in the Receiving hole 2 inserted before the nozzle body 9 in the receiving hole 2 is introduced.
  • the elasticity achieved by the folded section 19 Heat protection sleeve 11 limits the required to be applied in the axial direction Installation force.
  • the heat protection sleeve 11 combines the functions easier installation, effective sealing against the combustion gases and effective heat dissipation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (10)

  1. Gaine de protection thermique (11) pour un injecteur (5) pouvant être monté dans un alésage d'accueil (2) d'une culasse (1) de moteur à combustion interne, afin d'injecter directement du carburant dans une chambre de combustion (3) du moteur, dans laquelle :
    entourant au moins en partie le corps de buse (9) de l'injecteur de carburant (5), un corps de gaine (12) présente à son extrémité (18) située vers l'injection, une partie rabattue (19) dans laquelle le cors de gaine (12) comporte deux couches, ainsi qu'une partie conique (20) qui va en se rétrécissant en direction de l'extrémité (18) située vers l'injection et qui, à l'état monté, est étroitement appliquée sur une partie correspondante (10) du corps de buse (9),
    le corps de gaine (12) est configuré de manière qu'à l'état monté, dans sa partie (19) rabattue à deux couches, la couche interne (30) peut être étroitement appliquée sur le corps de buse (9) de l'injecteur (5),
    caractérisée en ce que
       le corps de gaine (12) dans la zone de sa partie rabattue (19) est élastique radialement, de sorte que la couche externe (31) de cette partie (19) peut être étroitement appliquée sur la paroi de l'alésage d'accueil (2) de la culasse (1).
  2. Gaine de protection thermique selon la revendication 1,
    caractérisée en ce qu'
    il existe une fente (32) entre la couche interne (30) et la couche externe (31) de la partie rabattue à deux couches (19).
  3. Gaine de protection thermique selon l'une quelconque des revendications 1 ou 2,
    caractérisée en ce que
    le corps de gaine (12), à son extrémité (18) située vers l'injection, est replié en forme de U pour créer la partie rabattue à deux couches (19).
  4. Gaine de protection thermique selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    la partie rabattue (19) du corps de gaine (12) fait suite directement, dans le sens opposé à l'écoulement, à la partie conique (20) du corps de gaine (12).
  5. Gaine de protection thermique selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    le corps de gaine (12) présente une partie cylindrique creuse (33) qui fait suite à la partie conique (20) du côté opposé à la partie rabattue (19).
  6. Gaine de protection thermique selon la revendication 5,
    caractérisée en ce que
    le diamètre intérieur (D) de la partie cylindrique creuse (33) est supérieur au diamètre extérieur (d) d'une partie du corps de buse (9) qui, à l'état monté, est à l'intérieur de la partie cylindrique creuse (33).
  7. Gaine de protection thermique selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce qu'
    elle présente un col (13) raccordé au corps de gaine (12) à l'extrémité de celui-ci qui est éloignée de l'extrémité (18) située vers l'injection.
  8. Gaine de protection thermique selon la revendication 7,
    caractérisée en ce que
    le col (13) s'étend perpendiculairement à l'axe longitudinal (4) du corps de gaine (12).
  9. Gaine de protection thermique selon l'une quelconque des revendications 7 ou 8,
    caractérisée en ce que
    le corps de gaine (12) et le col (13) sont constitués en une seule pièce, de préférence en tôle formée par étirage.
  10. Gaine de protection thermique selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    la partie rabattue (19) peut être réalisée par bordage ou pliage.
EP98943654A 1997-09-30 1998-07-08 Gaine de protection thermique Expired - Lifetime EP0941399B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19743103A DE19743103A1 (de) 1997-09-30 1997-09-30 Wärmeschutzhülse
DE19743103 1997-09-30
PCT/DE1998/001888 WO1999017015A1 (fr) 1997-09-30 1998-07-08 Gaine de protection thermique

Publications (2)

Publication Number Publication Date
EP0941399A1 EP0941399A1 (fr) 1999-09-15
EP0941399B1 true EP0941399B1 (fr) 2003-01-15

Family

ID=7844082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98943654A Expired - Lifetime EP0941399B1 (fr) 1997-09-30 1998-07-08 Gaine de protection thermique

Country Status (5)

Country Link
US (1) US6196195B1 (fr)
EP (1) EP0941399B1 (fr)
JP (1) JP2001508520A (fr)
DE (2) DE19743103A1 (fr)
WO (1) WO1999017015A1 (fr)

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DE19962968A1 (de) 1999-12-24 2001-06-28 Bosch Gmbh Robert Ausgleichselement
US6408801B1 (en) * 2000-04-26 2002-06-25 Delphi Technologies, Inc. Method for dissipating heat at the tip of a fuel injector
DE10027662A1 (de) 2000-06-03 2001-12-06 Bosch Gmbh Robert Dichtmittel und Niederhalter für ein Brennstoffeinspritzventil
DE10027669A1 (de) * 2000-06-03 2001-12-06 Bosch Gmbh Robert Befestigungsmittel für ein Brennstoffeinspritzventil
DE10038763A1 (de) * 2000-08-09 2002-02-21 Bosch Gmbh Robert Ausgleichselement für ein Brennstoffeinspritzventil
US7028918B2 (en) * 2001-02-07 2006-04-18 Cummins Engine Company, Inc. Fuel injector having a nozzle with improved cooling
DE10108194A1 (de) 2001-02-21 2002-08-29 Bosch Gmbh Robert Dichtvorrichtung für ein Brennstoffeinspritzventil
US7070126B2 (en) 2001-05-09 2006-07-04 Caterpillar Inc. Fuel injector with non-metallic tip insulator
US6959695B2 (en) 2001-10-17 2005-11-01 Robert Bosch Corporation Multi-point fuel injection module
DE10200044A1 (de) * 2002-01-03 2003-07-24 Bosch Gmbh Robert Brennstoffeinspritzventil
US6799541B1 (en) 2002-10-25 2004-10-05 Darton International, Inc. Cylinder sleeve with coolant groove
CN100422539C (zh) * 2002-10-31 2008-10-01 浙江飞亚电子有限公司 电控燃油喷射四冲程汽油发动机
US6845758B2 (en) * 2003-02-19 2005-01-25 International Engine Intellectual Property Company, Llc Fuel injector retainer assembly
DE112004000356D2 (de) 2003-03-27 2006-02-23 Siemens Ag Direkt-Einspritzventil in einem Zylinderkopf
US7007674B2 (en) 2003-04-01 2006-03-07 Robert Bosch Corporation Fuel rail assembly
US20050051138A1 (en) * 2003-09-08 2005-03-10 Robert Bosch Corporation Intake manifold assembly
DE10345965A1 (de) * 2003-10-02 2005-07-07 Parker Hannifin Gmbh Brennstoffeinspritzventil
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US7484499B2 (en) * 2007-04-03 2009-02-03 Gm Global Technology Operations, Inc. Combustion seal
DE102007035714A1 (de) * 2007-07-30 2009-02-05 Robert Bosch Gmbh Brennstoff-Einspritzanlage mit Ausgleichselement
DE102007045258B4 (de) * 2007-09-21 2017-06-14 Volkswagen Ag Brennkraftmaschine
US8230838B2 (en) * 2009-09-23 2012-07-31 Cummins Intellectual Properties, Inc. Injector seal assembly and method of sealing a coolant passage from an injector
US8960156B2 (en) * 2011-02-28 2015-02-24 Volvo Lastvagnar Ab Injector sleeve
AT512667B1 (de) 2012-04-05 2014-03-15 Bosch Gmbh Robert Einspritzdüse zum Einspritzen von Medien in einen Brennraum
JP6081095B2 (ja) 2012-07-17 2017-02-15 Nok株式会社 シール構造
JP5768800B2 (ja) 2012-11-05 2015-08-26 株式会社デンソー 燃料噴射装置
DE102013212321A1 (de) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Kraftstoffinjektor
US10605213B2 (en) * 2015-08-21 2020-03-31 Cummins Inc. Nozzle combustion shield and sealing member with improved heat transfer capabilities
DE102015223605A1 (de) * 2015-11-27 2017-06-01 Robert Bosch Gmbh Injektoranordnung mit Thermoschutzhülse
DE102015225055A1 (de) * 2015-12-14 2017-06-14 Robert Bosch Gmbh Kraftstoffinjektor
US9976527B1 (en) * 2017-01-13 2018-05-22 Caterpillar Inc. Fuel injector assembly having sleeve for directing fuel flow
JP2018172972A (ja) * 2017-03-31 2018-11-08 本田技研工業株式会社 燃料噴射弁の取付構造
DE102019124234A1 (de) * 2019-09-10 2021-03-11 Man Energy Solutions Se Brennkraftmaschine
FR3124233B1 (fr) * 2021-06-22 2023-05-05 Renault Procédé de formage d’un dispositif de protection thermique

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Also Published As

Publication number Publication date
US6196195B1 (en) 2001-03-06
WO1999017015A1 (fr) 1999-04-08
DE19743103A1 (de) 1999-04-01
EP0941399A1 (fr) 1999-09-15
JP2001508520A (ja) 2001-06-26
DE59806934D1 (de) 2003-02-20

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