EP2912301A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP2912301A1
EP2912301A1 EP13766372.0A EP13766372A EP2912301A1 EP 2912301 A1 EP2912301 A1 EP 2912301A1 EP 13766372 A EP13766372 A EP 13766372A EP 2912301 A1 EP2912301 A1 EP 2912301A1
Authority
EP
European Patent Office
Prior art keywords
valve housing
sleeve
sealing element
combustion chamber
fuel injector
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
EP13766372.0A
Other languages
German (de)
English (en)
Other versions
EP2912301B1 (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

Links

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! Njektor according to the preamble of
  • the injector is used to inject fuel into the combustion chamber of an internal combustion engine.
  • the internal combustion engine in the region of a combustion chamber bounding
  • Fuel! Njektor is inserted with its valve housing.
  • 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 with the interposition of a nozzle disc and with axial
  • Preload received in the receiving bore of the cylinder head Preload received 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 increases with increasing distance
  • Combustion chamber off In particular, at relatively low combustion chamber temperatures or at a relatively large distance from the combustion chamber, it may favor, among other things, for example, by sulfur-containing fuel or resulting from the combustion of the fuel water to form condensate on the valve body of the fuel! come in njektors. Since the 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 come over the life of the fuel! Seen njektors considered can lead to an impairment of the functioning of the fuel injector.
  • Valve housing have a greater wall thickness, which is in practice for various reasons neither desired nor possible, since for example the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
  • the present invention seeks to further develop 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, as in spark-ignited internal combustion engines is known, a constructive at least substantially unchanged, ie Conventional valve body can be used.
  • a fuel injector with the features of claim 1, characterized in that the sealing element by means of a separate component formed as an additional element in the axial direction of the first
  • Valve housing portion (12) is positioned. In contrast to the prior art, it is therefore not necessary, 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 be designed in the form of a sleeve which encloses the first
  • Valve housing portion radially, preferably with a small gap surrounds.
  • Such a design also has the particular advantage that the sleeve can act in the manner of a protective element in which in the presence of condensate initially the sleeve as a kind of "sacrificial element" is used before the
  • Condensate can attack the actual valve body, if it should come to a failure of the sealing element.
  • the end face is in the installation position the second valve housing portion rests, and when the edge portion rests on a stage of the receiving opening, of which the first
  • Receiving bore portion goes out.
  • Receiving bore portion may optionally be dispensed with the nozzle visor conventionally used in the prior art, and by the formation of the
  • flange-shaped peripheral edge is a particularly safe investment or support of the fuel! Njektors in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly of the sleeve in the receiving opening allows.
  • 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 is inventively preferably prepared by the fact that the plastic of the sealing element by injection molding on the end face of the sleeve or through
  • Dipping the sleeve is connected in the liquefied plastic of the sealing element with the sleeve.
  • the sealing element it is particularly advantageous according to the invention, when the sealing element, the sleeve radially to the first
  • Valve housing section seals off. 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 bears radially on the first receiving bore portion sealingly and thereby the radial area between the sleeve and the first
  • Receiving bore section seals. This ensures that no condensate in the radial circumferential gap between the
  • Receiving bore portion and the sleeve can pass, so that the sleeve itself is optimally protected against the action of condensate.
  • Fig. 1 is an illustration of a lower part of an inventive
  • FIG. 2 shows one for use with the fuel injector according to FIG. 1.
  • FIG. 1 shows a detail of the upper region of a self-igniting internal combustion engine with its cylinder head 100.
  • 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 is designed in particular as a common rail injector.
  • 106 includes on the combustion chamber 101 side facing a first receiving bore portion 107, to which a second receiving bore portion 108 connects to the side facing away from the combustion chamber 101 side.
  • the two receiving bore portions 107, 108 are connected to each other via a radially encircling step 109, wherein the first receiving bore portion
  • Receiving bore portions 107, 108 are preferably each cylindrical.
  • the injector 10 comprises a valve housing 11 made of metal with two valve housing sections 12, 13 connected in one piece with one another.
  • the first valve housing section 12 has a smaller diameter than the second
  • Valve housing portion 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.
  • Receiving bore portion 107 is arranged, the end portion 14 of the valve housing 1 1 protrudes into the combustion chamber 101.
  • the arrangement of the Fuel! Njektors 10 to the combustion chamber 101 and the longitudinal axis 105 is exemplified parallel to the longitudinal axis 105, but it may also be provided obliquely to the longitudinal axis 105.
  • Receiving bore portion 108 decreases toward.
  • the first valve housing portion 12 within the first receiving bore portion 107 is radially surrounded by a sealing element 20.
  • the sealing element 20 protrudes in relation to the longitudinal axis 105 almost to the end of the first receiving bore section 107 facing the lower end face 11 of the cylinder head 100. However, 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 effected 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 region 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.
  • the additional element 21 on the sealing element 20 is used in particular for the axial positioning of the sealing element 20 on the outside of the first valve housing section 12.
  • Valve housing 11 forms. Through an appropriate training of
  • Edge region 26 may optionally be dispensed with a conventional nozzle disc in the prior art, it being provided for forming the seal of the combustion chamber 101 in a conventional manner that the fuel! Njektor 10 is acted upon in the axial direction in the direction of the combustion chamber 101 toward, for example by means of a non-illustrated
  • the additional element 21 or the sleeve 22 surrounds the first
  • Valve housing portion 12 preferably forming only a small radial gap 27. This ensures that a simple assembly or
  • Njektors 10 on or from the sealing element 20 is made possible because a sliding friction is formed between the sealing element 20 and the first valve housing portion 12, 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. The purpose of this is the
  • Njektor 10 or its sealing element 20 and the additional element 21 can be turned away in a variety of ways or modified, without departing from the spirit.
  • the sleeve 22 with openings or the like can be turned away in a variety of ways or modified, without departing from the spirit.
  • the additional element 21 merely serves as a positioning element for axially positioning the sealing element 20 on the first valve housing section 12. It is also conceivable to 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. In this case, for example, can be dispensed with the edge region 26 of the additional element 21, when a nozzle sealing disc is used in the usual way.
  • the sealing element 20 in the manner of two
  • Front side 23 may be arranged.

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)

Abstract

L'invention concerne un injecteur de carburant (10), en particulier un injecteur à rampe commune, comportant un boîtier de soupape (11) qui peut être installé dans un orifice de réception (106) d'une tête de cylindre (100) d'un moteur à combustion interne et comporte dans la position de montage une première partie de boîtier de soupape (12) orientée vers une chambre de combustion (101) du moteur à combustion interne. La première partie de boîtier de soupape (12) est en métal et, sur la face orientée vers la chambre de combustion (101), elle est entourée radialement par un élément d'étanchéité (20) qui peut être installé dans l'espace annulaire entre la première partie de boîtier de soupape (12) et l'orifice de réception (106) au niveau d'une première partie de perçage 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 true EP2912301A1 (fr) 2015-09-02
EP2912301B1 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
US10041440B2 (en) * 2015-12-02 2018-08-07 Aaron Di Pietro Fuel injector insert
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
DE10108195A1 (de) * 2001-02-21 2002-08-22 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10108194A1 (de) * 2001-02-21 2002-08-29 Bosch Gmbh Robert Dichtvorrichtung für ein 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
See references of WO2014063898A1 *

Also Published As

Publication number Publication date
US9488143B2 (en) 2016-11-08
BR112015009282B1 (pt) 2021-01-19
EP2912301B1 (fr) 2017-04-12
BR112015009282A2 (pt) 2017-07-04
CN104769270A (zh) 2015-07-08
US20150252766A1 (en) 2015-09-10
DE102012219654A1 (de) 2014-04-30
CN104769270B (zh) 2018-02-13
WO2014063898A1 (fr) 2014-05-01

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