EP2321521B1 - Injecteur de carburant destiné à être disposé sur une chambre de combustion d'un moteur à combustion interne - Google Patents

Injecteur de carburant destiné à être disposé sur une chambre de combustion d'un moteur à combustion interne Download PDF

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Publication number
EP2321521B1
EP2321521B1 EP09779830.0A EP09779830A EP2321521B1 EP 2321521 B1 EP2321521 B1 EP 2321521B1 EP 09779830 A EP09779830 A EP 09779830A EP 2321521 B1 EP2321521 B1 EP 2321521B1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
nozzle
sealing element
nozzle body
injection valve
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
EP09779830.0A
Other languages
German (de)
English (en)
Other versions
EP2321521A1 (fr
Inventor
Thomas Hofmann
Michael HÄRTEL
Uwe Leuteritz
Ferdinand Löbbering
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2321521A1 publication Critical patent/EP2321521A1/fr
Application granted granted Critical
Publication of EP2321521B1 publication Critical patent/EP2321521B1/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
    • 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 injection valve for arrangement on a combustion chamber of an internal combustion engine comprising a nozzle holder, on which a nozzle body clamped by a nozzle clamping nut, designed to protrude into the combustion chamber nozzle nozzle for receiving a nozzle needle is arranged, and at least one annular disk-shaped sealing element with an upper bearing surface facing the nozzle retaining nut and a combustion chamber facing the lower support surface which surrounds the nozzle body and serves to seal the nozzle holder relative to the combustion chamber.
  • a nozzle retaining nut holds the two main components of the fuel injector - an injector and a valve body - firmly together.
  • the injection nozzle protrudes in the assembled state of the fuel injector in the cylinder head into a combustion chamber of a motor vehicle engine, wherein the valve body arranged above actuates the injection nozzle.
  • the sealing arrangement is exposed to high thermal loads (-40 ° C at cold start in winter, to over +150 ° C) under operating conditions and on the other hand, the sealing device is exposed to high mechanical, in particular vibration loads.
  • the sealing arrangement must ensure a long-lasting loads, permanent sealing state between the fuel injector and the cylinder head.
  • the injector is sealed to the combustion chamber with a metal washer. This seal is necessary because of the hot exhaust gases and the pressure loss in the cylinder. Due to the high combustion temperatures and high cylinder pressures, sealing is only possible with a metal sealing disk, so that no combustion gases can flow directly past the injector into the environment.
  • a nozzle retaining nut at a free end has a frusto-conical region which can be inserted into a corresponding frusto-conical injector bore section.
  • the preassembled state that is, when the fuel injector is inserted with nozzle retaining nut in the frusto-conical Injektorbohrung, there is a circumferential angle difference of 2 ° to a maximum of 5 ° between the truncated cone on the nozzle retaining nut and the truncated cone bore in the cylinder head.
  • the protection of the nozzle body from heat by coating and the installation of sleeves as heat sinks is known.
  • the GB 1262164 discloses a copper sleeve for an injector for better heat dissipation.
  • new combustion processes seem to ensure corrosion in this area, so that a direct seal in this area against corrosive substances from combustion gases is absolutely necessary.
  • FIG. 1 shows partially in longitudinal section a detail of a fuel injection valve 10 with a nozzle retaining nut 20, which clamps a nozzle body 30.
  • Schematically indicated at 40 is a combustion chamber in which the nozzle body 30 partially protrudes.
  • a combustion chamber sealing element 50 is arranged at the interface nozzle retaining nut 20, nozzle body 30 and combustion chamber 40.
  • the combustion chamber sealing element 50 comprises the part of the nozzle body 30 protruding beyond the nozzle retaining nut 20.
  • the nozzle body 30 has a circular or annular cross-section in the longitudinal direction, that is to say in the injection direction.
  • the combustion chamber sealing element 50 likewise has a corresponding annular cross section in the longitudinal direction.
  • the outer diameter of the nozzle body cross section corresponds approximately to the inner diameter of the recess of the combustion chamber sealing element 50 (annular recess).
  • the combustion chamber sealing element 50 has two end faces or bearing surfaces, an upper bearing surface 60, which faces the nozzle retaining nut 20, and a lower bearing surface 70, which faces the combustion chamber 40.
  • FIG. 2 shows in longitudinal section a corresponding section according to FIG. 1 , wherein a further sealing element 80 is provided.
  • This sealing element surrounds the nozzle body 30 in the region of a shoulder 90 of the nozzle body 30 in the contact area of the nozzle retaining nut 20 and the combustion chamber sealing element 50.
  • the sealing element 80 may be formed as a separate ring element, which consists of very soft metals, heat-resistant polymers or other fuel-resistant materials.
  • the inner diameter of this annular sealing element 50 corresponds approximately to the outer diameter of the nozzle body 30 so that it can be applied to the latter from the combustion chamber end of the nozzle body.
  • FIG. 2A shows the enlarged area A. FIG. 2 , It can be seen that the sealing element 80 comes into abutment with the nozzle body 30 of the nozzle retaining nut 20 and the combustion chamber sealing element 50 in the assembled state of the fuel injection valve.
  • FIG. 3 shows the same section as FIG. 2a wherein the sealing element 180 is formed here by vulcanizing a sealing area to the nozzle retaining nut 20.
  • the vulcanization of the sealing element 180 takes place before the mounting of the combustion chamber sealing element 50.
  • the sealing element 180 thus stands out as FIG. 3 can be seen only in contact with the nozzle body 30 and the nozzle retaining nut 20. A contact in the assembled state even with the combustion chamber sealing element 50 is not excluded.
  • FIG. 4 also shows the section corresponding to the FIG. 2A , Also in this embodiment, a sealing member 280 is formed by the scorching. In contrast to FIG. 3 However, the vulcanization of the sealing element 280 is carried out to the combustion chamber sealing element 50, namely in the region between the outer circumference of the nozzle body and in the inner circumference of the combustion chamber sealing element 50.
  • FIG. 5 shows the the FIG. 2A corresponding section of the fuel injection valve.
  • the gap formed by the shoulder of the nozzle body 30, the nozzle lock nut 20, and the combustion chamber seal member 50 is filled with a heat-resistant potting compound as the seal member 380.
  • This potting compound is introduced after the screwing of the nozzle retaining nut 20 with the nozzle body 30. As a result, the seal member 380 abuts the nozzle body 30 and the nozzle lock nut 20.
  • FIGS. 6 to 8 show embodiments of the invention in which by a geometric modification of the combustion chamber sealing member 150, 250, 350, a further additional seal is formed to seal against deposits by unburned mixture and exhaust gases in the gap between the nozzle lock nut 20 and nozzle body 30.
  • an annular disk-shaped combustion chamber sealing element 150 is shown, which in the region of its inner diameter, radially inwardly, has a tongue 100 formed longitudinally in the axial direction towards the combustion chamber.
  • This tongue 100 is in the cross-section of the combustion chamber sealing member 150 tapering radially inwardly below (toward the combustion chamber 40) formed so far that a sealing contact with the outer peripheral surface of the nozzle body 30 is made.
  • FIG. 7 also shows an annular disk-shaped combustion chamber sealing element 250 with a tongue 200, which is formed in the axial direction of the fuel injection valve from the combustion chamber 40 away.
  • the tongue 200 also runs in a tapered manner in cross-section of the combustion chamber sealing element 250 and forms a sealing contact with the nozzle body 30 in the region of the shoulder 90 of the nozzle body 30.
  • annular disk shaped combustion chamber sealing member 350 is shown in FIG. 8 .
  • this combustion chamber sealing element 350 tapers uniformly radially inwards and runs in cross section tapered to the outer diameter of the nozzle body and forms a sealing contact with this.
  • the sealing takes place via a tongue 300, which is rectangular in cross section, of the combustion chamber sealing element 350.
  • FIG. 9 shows a sealing element 400 which is formed by a radially inwardly projecting tongue on the nozzle lock nut 120.
  • the nozzle retaining nut 120 has at its region adjacent to the combustion chamber sealing element 50 an extension 400 which protrudes radially inward to such an extent that it comes into sealing contact with the nozzle body 30 in the region of the shoulder 90.
  • the tongue 400 is shown tapered in the present case, but may also have a different cross-sectional shape thereof.

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

Claims (2)

  1. Soupape d'injection de carburant destinée à être montée dans une chambre de combustion (40) d'un moteur à combustion interne, comprenant :
    un support de buse, sur lequel est monté un corps de buse (30) conçu pour dépasser dans la chambre de combustion (40), fixé par l'intermédiaire d'un écrou de serrage de buse (20), pour le logement d'une aiguille de buse, et au moins un élément d'étanchéité de chambre de combustion (150 ; 250 ; 350) de forme annulaire avec une surface d'appui supérieure (60) orientée vers l'écrou de serrage de buse (20) et une surface d'appui inférieure (70) orientée vers la chambre de combustion (40), qui entoure le corps de buse (30) et qui sert à étanchéifier le support de buse par rapport à la chambre de combustion (40), au moins un élément d'étanchéité supplémentaire (100 ; 200 ; 280 ; 300) étant prévu pour étanchéifier du corps de buse (30) au niveau de l'écrou de serrage de buse (20),
    caractérisé en ce que l'élément d'étanchéité supplémentaire (100 ; 200 ; 280 ; 300) est constitué d'une zone partielle de l'élément d'étanchéité de chambre de combustion (150 ; 250 ; 350) sous la forme d'une modification géométrique, un contact d'étanchéité étant établi avec la surface circonférentielle externe du corps de buse (30), afin d'assurer une étanchéité vis-à-vis des dépôts dus à la non-combustion du mélange et aux gaz d'échappement dans l'interstice entre l'écrou de serrage de buse (20) et le corps de buse (30).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'élément d'étanchéité (80) est constitué de métaux très mous, de polymères résistant à la chaleur ou d'autres matériaux résistant aux carburants.
EP09779830.0A 2008-08-05 2009-06-18 Injecteur de carburant destiné à être disposé sur une chambre de combustion d'un moteur à combustion interne Active EP2321521B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008036413A DE102008036413A1 (de) 2008-08-05 2008-08-05 Kraftstoffeinspritzventil zur Anordnung an einem Brennraum einer Brennkraftmaschine
PCT/EP2009/057590 WO2010015454A1 (fr) 2008-08-05 2009-06-18 Injecteur de carburant destiné à être disposé sur une chambre de combustion d'un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2321521A1 EP2321521A1 (fr) 2011-05-18
EP2321521B1 true EP2321521B1 (fr) 2014-11-05

Family

ID=41137775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09779830.0A Active EP2321521B1 (fr) 2008-08-05 2009-06-18 Injecteur de carburant destiné à être disposé sur une chambre de combustion d'un moteur à combustion interne

Country Status (5)

Country Link
US (1) US8528524B2 (fr)
EP (1) EP2321521B1 (fr)
CN (1) CN102112726B (fr)
DE (1) DE102008036413A1 (fr)
WO (1) WO2010015454A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000285A1 (de) * 2009-01-19 2010-07-22 Robert Bosch Gmbh Kraftstoff-Injektor sowie Brennkraftmaschine mit Kraftstoff-Injektor
JP5270714B2 (ja) * 2011-04-27 2013-08-21 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
US10036355B2 (en) * 2013-08-08 2018-07-31 Cummins Inc. Heat transferring fuel injector combustion seal with load bearing capability
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
DE102014225976A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Brennstoffeinspritzvorrichtung
US11174825B2 (en) * 2019-02-11 2021-11-16 Caterpillar Inc. Seal configuration for fuel injector
US10746145B1 (en) * 2019-05-08 2020-08-18 Delphi Technologies Ip Limited Isolator for fuel injector

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1262164A (en) 1969-06-07 1972-02-02 Gkn Floform Ltd Fuel injector sleeve for a diesel engine
US3695235A (en) * 1970-08-26 1972-10-03 Mcculloch Corp Heat seal for fuel injection nozzles
US5330100A (en) * 1992-01-27 1994-07-19 Igor Malinowski Ultrasonic fuel injector
DE19807819C1 (de) * 1998-02-26 1999-05-12 Mtu Friedrichshafen Gmbh Verfahren zur brennraumseitigen Abdichtung eines Einspritzventils einer Brennkraftmaschine
JP4067237B2 (ja) * 1999-05-27 2008-03-26 ヤマハマリン株式会社 筒内噴射式エンジン
DE10027662A1 (de) * 2000-06-03 2001-12-06 Bosch Gmbh Robert Dichtmittel und Niederhalter für ein Brennstoffeinspritzventil
DE10102192B4 (de) 2001-01-16 2012-12-13 Volkswagen Ag Vorrichtung zur Halterung von Einspritzelementen im Zylinderkopf einer Brennkraftmaschine
DE102004049277A1 (de) * 2004-10-09 2006-04-13 Robert Bosch Gmbh Dämpfungselement für ein Brennstoffeinspritzventil
CN100334344C (zh) 2005-01-26 2007-08-29 周书田 多喷孔铅笔型喷油器
DE102005053112A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Kraftstoffeinspritzventil mit Sicherung für ein Ventil-Brennraum-Dichtelement

Also Published As

Publication number Publication date
DE102008036413A1 (de) 2010-02-18
EP2321521A1 (fr) 2011-05-18
US20110132329A1 (en) 2011-06-09
CN102112726A (zh) 2011-06-29
WO2010015454A1 (fr) 2010-02-11
US8528524B2 (en) 2013-09-10
CN102112726B (zh) 2017-03-01

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