EP2912301B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2912301B1
EP2912301B1 EP13766372.0A EP13766372A EP2912301B1 EP 2912301 B1 EP2912301 B1 EP 2912301B1 EP 13766372 A EP13766372 A EP 13766372A EP 2912301 B1 EP2912301 B1 EP 2912301B1
Authority
EP
European Patent Office
Prior art keywords
valve housing
sleeve
sealing element
fuel injector
housing portion
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
EP13766372.0A
Other languages
German (de)
English (en)
Other versions
EP2912301A1 (fr
Inventor
Frank Stadler
Bernd Siewert
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 EP2912301A1 publication Critical patent/EP2912301A1/fr
Application granted granted Critical
Publication of EP2912301B1 publication Critical patent/EP2912301B1/fr
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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Such, known from practice fuel injector is used for injecting fuel into the combustion chamber of an internal combustion engine.
  • the internal combustion engine in the region of a cylinder head defining the combustion chamber has a receptacle in the form of a stepped bore into which the fuel injector with its valve housing is inserted.
  • the fuel injector protrudes into the combustion chamber of the internal combustion engine with at least one nozzle opening.
  • the injector of the fuel injector is usually added with the interposition of a nozzle disc and with axial bias in the receiving bore of the cylinder head.
  • the highest temperature prevails in the combustion chamber, which gradually decreases in the cylinder head or in the receiving bore on the side facing away from the combustion chamber, as a function of the distance to the combustion chamber.
  • the temperature of the fuel injector or its valve housing also decreases with increasing distance to the combustion chamber.
  • it may favor condensate formation on the valve housing of the fuel injector, inter alia favored by, for example, sulfur-containing fuel or resulting from the combustion of the fuel water.
  • valve housing in the cylinder head is sealed to the outside via the nozzle sealing disk, the area axially below the nozzle sealing disk in the region of a first receiving bore section of the cylinder head is particularly affected, because there, in relative terms, the lowest temperatures prevail.
  • the formation of condensation can lead to corrosion of the valve housing in the area mentioned considered that over the life of the fuel injector considered can lead to a deterioration of the functionality of the fuel injector.
  • valve housing would have to have a greater wall thickness, which is neither desirable nor possible in practice for various reasons, since, for example, the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
  • a sealing device for sealing a fuel injection valve is known.
  • the invention has the object, a fuel injector, in particular a common rail injector for use in self-igniting internal combustion engines, according to the preamble of claim 1 such that using a sealing element, such as this is known in spark-ignited internal combustion engines, a constructive at least substantially unchanged, ie Conventional valve body can be used.
  • This object is achieved in a fuel injector with the features of claim 1, characterized in that the sealing element is positioned by means of a separate component formed as an additional element in the axial direction of the first valve housing portion.
  • the valve housing by means of an annular groove o. to be provided with a concomitant weakening of the valve housing or an increased wall thickness.
  • the additional element is in the form of a sleeve which surrounds the first valve housing portion radially, preferably with a small gap.
  • a sleeve which surrounds the first valve housing portion radially, preferably with a small gap.
  • the sleeve can act in the manner of a protective element in which in the presence of condensate initially the sleeve as a kind "sacrificial element" is used before the condensate can attack the actual valve body, if there is a failure of the sealing element should come.
  • the sleeve extends according to claim 1 on the side facing the combustion chamber in the first receiving bore portion almost to the combustion chamber and on the combustion chamber facing away Side up to a subsequent to the first valve housing portion, in comparison to the first valve housing portion having a larger diameter second valve housing portion.
  • the sleeve according to claim 1 on the side facing away from the sealing element on a flange peripheral edge region, on the in the installed position the end face the second valve housing portion rests, and when the edge region rests on a step of the receiving opening from which the first receiving bore portion extends.
  • the nozzle disc commonly used in the prior art
  • the formation of the flange peripheral edge is a particularly secure investment or edition of the fuel injector in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly allows the sleeve in the receiving opening.
  • the sleeve In the event that the sleeve is exposed to the condensate, it is appropriate that this is as resistant to the condensate as possible, i. is not mechanically or chemically damaged by the action of the condensate. Therefore, it is provided in a further embodiment of the invention that the sleeve consists of an inert material, in particular stainless steel or plastic.
  • the sealing element consists of plastic, in particular based on Viton, silicone or Teflon.
  • the sealing element is arranged on the combustion chamber facing the end face of the sleeve. This ensures that the sealing element is that element which first comes into operative connection with the condensate when condensate occurs.
  • connection between the plastic of the sealing element and the sleeve according to the invention is preferably prepared in that the plastic of the sealing element is connected by injection molding on the end face of the sleeve or by immersion of the sleeve in the liquefied plastic of the sealing element with the sleeve.
  • the sealing element seals the sleeve radially towards the first valve housing section. This ensures in particular that when condensate occurs, the condensate does not come into operative connection with the valve housing section, as is sealed by the sealing element of the radial gap between the valve housing and the receiving opening of the sleeve.
  • the sealing element sealingly rests radially on the first receiving bore portion and thereby seals the radial region between the sleeve and the first receiving bore portion. This ensures that no condensate can pass into the radially circumferential gap between the receiving bore portion and the sleeve, so that the sleeve itself is optimally protected against the action of the condensate.
  • FIG. 1 is fragmentary the upper portion of a self-igniting internal combustion engine with the cylinder head 100 shown.
  • the cylinder head 100 defines a combustion chamber 101 of the internal combustion engine, in which a piston 102 is arranged in the usual way up and down movable in the direction of a longitudinal axis 105.
  • the cylinder head 100 has a receiving opening 106 in the form of a stepped bore.
  • the receiving opening 106 comprises, on the side facing the combustion chamber 101, a first receiving bore section 107, to which a second receiving bore section 108 adjoins on the side facing away from the combustion chamber 101.
  • the two receiving bore portions 107, 108 are connected to each other via a radially encircling step 109, wherein the first receiving bore portion 107 has a smaller diameter than the second receiving bore portion 108, and wherein the two receiving bore portions 107, 108 are preferably each cylindrical.
  • Fuel injector 10 shown in simplified form comprises a valve housing 11 made of metal with two valve housing sections 12, 13.
  • the first valve housing section 12 has a smaller diameter than the second valve housing section 13, wherein the two valve housing sections 12, 13 are preferably cylindrical.
  • the first valve housing portion 12 is disposed substantially within the first receiving bore portion 107, and the second valve housing portion 13 within the second receiving bore portion 108.
  • the first valve housing portion 12 merges on the side facing the combustion chamber 101 in a dome-like end portion 14, in whose wall at least one nozzle opening 15 is formed, can be injected via the fuel into the combustion chamber 101 of the internal combustion engine.
  • the injection of the fuel takes place in a known per se and therefore not explained in more detail because not essential to the invention in particular by a nozzle needle arranged in the fuel injector 10, which can be actuated by an actuator.
  • first valve housing portion 12 While the first valve housing portion 12 is disposed within the first receiving bore portion 107, the end portion 14 of the valve housing 11 projects into the combustion chamber 101.
  • the arrangement of the Fuel injector 10 to the combustion chamber 101 and to the longitudinal axis 105 is, for example, parallel to the longitudinal axis 105, but it may also be provided obliquely to the longitudinal axis 105.
  • the sealing element 20 protrudes in relation to the longitudinal axis 105 almost to the lower end face 111 of the cylinder head 100 facing the end of the first receiving bore portion 107 zoom.
  • the sealing element 20 does not project into the combustion chamber 101 in any way.
  • the preferably made of (heat-resistant) plastic, preferably based on Viton, silicone or Teflon sealing element 20 is arranged or attached to an additional element 21.
  • the additional element 21 is designed in the form of a sleeve 22 and consists of an inert material, in particular stainless steel or plastic.
  • the sealing element 20 is arranged or attached to the combustion chamber 101 facing end face 23 of the sleeve 22.
  • the attachment of the sealing element 20 is carried out either by the fact that the sealing element 20 is molded onto the end face 23 of the additional element 21, for example by means of surface elements arranged in the immediate area of the end face 23, or by the additional element 21 with its end face 23 in the initially liquefied material of the sealing element 20 is immersed and adheres to the solidification of the end face 23.
  • the sealing element 20 is formed preferably convex both on its outer circumference 24 and on its inner circumference 25, such that the outer circumference 24 of the sealing element 20 bears sealingly against the first receiving bore section 107, while the inner circumference 25 of the sealing element 20 is in sealing abutting contact with the first valve housing section 12.
  • the additional element 21 is used in particular for the axial positioning of the sealing element 20 on the outside of the first valve housing section 12.
  • edge region 26 material, shape
  • a customary in the prior art nozzle disc wherein for forming the seal of the combustion chamber 101 it is provided in a conventional manner that the fuel injector 10 in the axial direction in Direction to the combustion chamber 101 is subjected to force, for example by means of a clamping claw, not shown, or the like.
  • the additional element 21 or the sleeve 22 surrounds the first valve housing section 12 preferably forming only a small radial gap 27. This ensures that a simple assembly and disassembly of the fuel injector 10 is made possible on or by the sealing element 20, as between the sealing element 20 and the first valve housing portion 12, a sliding friction is formed, the valve housing 11 itself, however, can be easily inserted into the sleeve 22 and pulled out of this.
  • the edge region 26 allows easy mounting or dismounting of the sleeve 22.
  • the function of the sealing element 20 is in particular to avoid that condensate can get into the annular gap 27 between the sleeve 22 and the first valve housing portion 12. This is the purpose of the aforementioned sealing effect of the sealing element 20 between his Inner circumference 25 to the first valve housing portion 12 out.
  • the dense contact of the outer periphery 24 of the sealing member 20 at the first receiving bore portion 107 and a penetration of condensate in the annular portion 28 between the first receiving bore portion 107 and the outer circumference of the sleeve 22 is prevented.
  • the fuel injector 10 described so far or its sealing element 20 and the additional element 21 can be turned away or modified in many ways without departing from the spirit of the invention.
  • the additional element 21 merely serves as a positioning element for axially positioning the sealing element 20 on the first valve housing section 12.
  • fit the sleeve 22 by means of an interference fit or the like, e.g. by means of an adhesive connection to connect to the first valve housing portion 12.
  • the sealing element 20 can also be arranged in the manner of two round seals radially on the outside and inside of the sleeve 22 in the region of the end face 23.

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 (7)

  1. Injecteur de carburant (10), en particulier injecteur à rampe commune, comprenant un boîtier de soupape (11), qui peut être inséré dans une ouverture de réception (106) d'une culasse (100) d'un moteur à combustion interne et qui présente dans la position d'installation une première portion de boîtier de soupape (12) tournée vers une chambre de combustion (101) du moteur à combustion interne, la première portion de boîtier de soupape (12) se composant de métal et étant entourée radialement par un élément d'étanchéité (20) du côté tourné vers la chambre de combustion (101), l'élément d'étanchéité pouvant être inséré dans l'espace annulaire entre la première portion de boîtier de soupape (12) et l'ouverture de réception (106) dans la région d'une première portion d'alésage de réception (107) et lequel élément d'étanchéité (20) étant positionné radialement, dans la direction axiale sur la première portion de boîtier de soupape (12), de préférence avec un faible interstice (27) par rapport à la première portion de boîtier de soupape (12), au moyen d'un élément supplémentaire (21) réalisé sous forme de composant séparé sous la forme d'un manchon (22),
    caractérisé en ce que
    le manchon (22) s'étend du côté tourné vers la chambre de combustion (101) dans la première portion d'alésage de réception (107) pratiquement jusqu'à la chambre de combustion (101) et du côté opposé à la chambre de combustion (101) jusqu'à une deuxième portion de boîtier de soupape (13) se raccordant la première portion de boîtier de soupape (12), présentant un plus grand diamètre par comparaison avec la première portion de boîtier de soupape (12), et lequel manchon (22) présente, du côté opposé à l'élément d'étanchéité (20), une région de bord périphérique en forme de bride (26) sur laquelle repose, dans la position d'installation, le côté frontal de la deuxième portion de boîtier de soupape (13), et en ce que la région de bord (26) repose sur un gradin (109) de l'ouverture de réception (106), depuis lequel part la première portion d'alésage de réception (107).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que
    le manchon (22) se compose d'un matériau inerte, en particulier d'acier inoxydable ou de plastique.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    l'élément d'étanchéité (20) se compose de plastique, de préférence à base de Viton, de silicone ou de téflon.
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que
    l'élément d'étanchéité (20) est disposé dans la région du côté frontal (23) du manchon (22) tourné vers la chambre de combustion (101).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que
    le plastique de l'élément d'étanchéité (20) est connecté au manchon (22) par pulvérisation sur le côté frontal (23) du manchon (22), par exemple au moyen d'éléments de surface disposés dans la région du côté frontal (23), ou en plongeant le manchon (22) dans le plastique liquéfié de l'élément d'étanchéité (20).
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    l'élément d'étanchéité (20) étanchéifie le manchon (22) radialement par rapport à la première portion de boîtier de soupape (12).
  7. Injecteur de carburant selon la revendication 6, caractérisé en ce que
    l'élément d'étanchéité (20) s'applique hermétiquement radialement contre la première portion d'alésage de réception (107) et étanchéifie ainsi la région radiale (28) entre le manchon (22) et la première portion d'alésage de réception (107).
EP13766372.0A 2012-10-26 2013-09-26 Injecteur de carburant Active EP2912301B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012219654.4A DE102012219654A1 (de) 2012-10-26 2012-10-26 Kraftstoffinjektor
PCT/EP2013/070066 WO2014063898A1 (fr) 2012-10-26 2013-09-26 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2912301A1 EP2912301A1 (fr) 2015-09-02
EP2912301B1 true EP2912301B1 (fr) 2017-04-12

Family

ID=49231501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13766372.0A Active EP2912301B1 (fr) 2012-10-26 2013-09-26 Injecteur de carburant

Country Status (6)

Country Link
US (1) US9488143B2 (fr)
EP (1) EP2912301B1 (fr)
CN (1) CN104769270B (fr)
BR (1) BR112015009282B1 (fr)
DE (1) DE102012219654A1 (fr)
WO (1) WO2014063898A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212321A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Kraftstoffinjektor
DE102015223605A1 (de) * 2015-11-27 2017-06-01 Robert Bosch Gmbh Injektoranordnung mit Thermoschutzhülse
CA2950198C (fr) * 2015-12-02 2023-12-12 Aaron Di Pietro Insertion d'injecteur de carburant
DE102015225055A1 (de) * 2015-12-14 2017-06-14 Robert Bosch Gmbh Kraftstoffinjektor
GB2620755A (en) * 2022-07-20 2024-01-24 Jcb Res Fuel injector seal

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695235A (en) * 1970-08-26 1972-10-03 Mcculloch Corp Heat seal for fuel injection nozzles
DE2908095C2 (de) 1979-03-02 1984-02-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage für Brennkraftmaschinen
DE10108194A1 (de) * 2001-02-21 2002-08-29 Bosch Gmbh Robert Dichtvorrichtung für ein Brennstoffeinspritzventil
DE10108195A1 (de) * 2001-02-21 2002-08-22 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10125943A1 (de) 2001-05-29 2002-12-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US6866026B2 (en) * 2002-08-28 2005-03-15 Federal-Mogul World Wide, Inc. Gasket for fuel injector
JP5003934B2 (ja) * 2006-09-07 2012-08-22 内山工業株式会社 ガスケット
US7383818B1 (en) * 2007-04-04 2008-06-10 Gm Global Technology Operations, Inc. Fuel injector with secondary combustion seal
DE102009000285A1 (de) * 2009-01-19 2010-07-22 Robert Bosch Gmbh Kraftstoff-Injektor sowie Brennkraftmaschine mit Kraftstoff-Injektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BR112015009282B1 (pt) 2021-01-19
US20150252766A1 (en) 2015-09-10
WO2014063898A1 (fr) 2014-05-01
CN104769270B (zh) 2018-02-13
CN104769270A (zh) 2015-07-08
EP2912301A1 (fr) 2015-09-02
BR112015009282A2 (pt) 2017-07-04
US9488143B2 (en) 2016-11-08
DE102012219654A1 (de) 2014-04-30

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