EP1423602A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant

Info

Publication number
EP1423602A1
EP1423602A1 EP02754213A EP02754213A EP1423602A1 EP 1423602 A1 EP1423602 A1 EP 1423602A1 EP 02754213 A EP02754213 A EP 02754213A EP 02754213 A EP02754213 A EP 02754213A EP 1423602 A1 EP1423602 A1 EP 1423602A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
flame protection
injection system
protection shield
shield
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.)
Withdrawn
Application number
EP02754213A
Other languages
German (de)
English (en)
Inventor
Jürgen RAIMANN
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 EP1423602A1 publication Critical patent/EP1423602A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a fuel injection system according to the preamble of the main claim.
  • Fuel injection valve comprises, the fuel f in a combustion chamber formed by a piston / cylinder structure, and is provided with a spark plug projecting into the combustion chamber.
  • the fuel injector is arranged with at least one row distributed over the circumference of the fuel injector
  • injection holes Through a targeted injection of fuel through the injection holes, a jet-guided combustion process is formed by forming a
  • Fuel injection valve which thereby ' clog and the flow through the fuel injector is not permitted greatly decrease. This leads to malfunction of the internal combustion engine.
  • the fuel injection system according to the invention with the characterizing features of the main claim has the advantage that a flame protection shield arranged downstream of the injection openings of the ' fuel injection valve reduces the temperature of the flame front of the burning mixture cloud in the area of the spray openings so much that no combustion residues can precipitate in the area of the spray openings , whereby an overgrowth of the spray openings through coking residues is avoided.
  • the flame retardant shield can either be attached to the injection-side end of the fuel injection valve or to the wall of the receiving bore in the cylinder head in which the fuel injection valve is mounted.
  • the Fl mmschutzschild is designed as a cone or truncated cone, whereby a simple and inexpensive manufacture is possible.
  • the cone or partial cone can advantageously either have a homogeneous inclination with respect to the wall of the receiving bore or one or more inclination changes, as a result of which the height of the flame protection shield and thus the installation depth of the fuel injector can be adapted to the requirements in a simple manner.
  • the Radius determines the installation depth of the fuel injector.
  • the flame retardant shield can advantageously be designed in the form of partial shields which extend over a freely selectable angular range, the number of partial shields being matchable to the number of spray openings, the spray angle or the opening angle of the mixture cloud.
  • the protective function of the flame protection shield can be regulated as desired.
  • Fig. 1 shows a schematic section through a general
  • FIG. 2A shows a schematic section through the spray-side part of the fuel injection system shown in FIG. 1 in area II in FIG. 1;
  • Fig. 2B the spray-side part of the fuel injection system shown in Fig. 1 with a
  • FIGS. 4A-C show exemplary embodiments of a flame protection shield designed according to the invention, which is in each case attached to a wall of the receiving bore of the cylinder head adjacent to the injection-side end of the fuel injection valve;
  • Fig. 5 is a schematic plan view of the spray-side part of the
  • Fig. 6 is a schematic view of the downstream end of the fuel injector with an embodiment of an additional shield or an extension of the flame protection shield.
  • FIG. 1 shows a schematic and simplified view of a fuel injection system -1, which comprises a fuel injection valve 2, which is introduced into a receiving bore 3 of a cylinder head 4 of an internal combustion engine.
  • Fuel injection valve 2 is designed in the form of a direct injection fuel injection valve 2, which can be used for the direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignition internal combustion engine (not shown).
  • the fuel injection valve 2 has a plug-in connection • to a fuel distributor line 6 at an inlet-end 5 that is sealed by a seal 7 between the .
  • Fuel distributor line 6 and a feed pipe connector 8 of the fuel injector 2 is sealed.
  • the fuel injector 2 has Via an electrical connection 9 for the electrical contact ation for actuating the fuel injection valve 2.
  • the fuel injection valve 2 is provided at least in its part projecting beyond the cylinder head 4 with a plastic coating 10 which also surrounds the electrical connection 8.
  • the fuel injector 2 is by measures not shown, such as. B. a clamp, fixed in the ' cylinder head 4 and secured against rotation.
  • An elastomer ring 11 for centering and mounting the fuel injection valve 2 is provided in the receiving bore 3.
  • a sealing ring 13 is provided, • 'which seals the fuel injection valve 2 against the cylinder head 4 of the internal combustion engine.
  • a valve seat body 14 of the fuel injection valve 2 at least one spray opening, not visible in FIG. 1, is formed, through which the fuel is sprayed into the combustion chamber.
  • the fuel injector 2 is usually inserted into the receiving bore 3 of the cylinder head 4 in such a way that an end 15 of the fuel injector 2 on the injection side is flush with a surface 16 of the cylinder head 4 facing the combustion chamber or even towered over them.
  • This is disadvantageous in relation to the task, namely the reduction in the tendency of the fuel injector 2 to carbonize, so that to apply the measures according to the invention, the fuel injector 2 is first mounted in the receiving bore 3 of the cylinder head 4 in accordance with FIG 15 of the fuel injection valve 2 is arranged recessed relative to the surface 16 of the cylinder head 4 facing the combustion chamber.
  • the installation depth of the fuel injection valve 2 is dependent on the opening angle ⁇ of the cone jet sprayed by the fuel injection valve 2.
  • the fuel injector 2 must be in the Receiving hole 3 may be used that a wall 17 of
  • Location hole 3 is not wetted by the fuel.
  • the fuel injection system 1 has one to further protect the spray openings from coking
  • Flame protection shield 18 which either on the fuel injector 2, as shown in FIGS. 3A to 3C
  • the flame protection shield 18 Due to the arrangement of the flame protection shield 18 on the downstream side . Jets can coke the jets. be reduced. Since the diameter of the spray openings is typically approx. 100 ⁇ m, there is a risk that the spray openings become blocked by coking over time and . thus the flow rate is impermissibly restricted 5, relatively large. This is due in particular to the high temperatures when the mixture cloud injected into the combustion chamber is ignited, since this causes components of the fuel to settle at the tip of the fuel injector 2. By attaching the flame protection shield 18, the surface temperature in the outlet region of the spray openings can be reduced to such an extent that the spray openings cannot become overgrown due to coking residues. The flame protection shield 18 thereby prevents the flame front from spreading in the area between the flame protection shield 18 and the spray-side end. the fuel injector 2.
  • 3A to 3C show the section designated III in FIG. 2B with different ones Embodiments of the flame protection shield 18 according to the invention when formed on the fuel injection valve 2.
  • FIG. 3A shows a simple shape, which is conical or frustoconical in shape and extends in the spray direction from the tip of the fuel suction injector 2 m in the direction of the combustion chamber.
  • the inclination ⁇ of the conical or truncated cone-shaped flame protection shield 18 relative to the wall 17 of the receiving bore 3 of the cylinder head can be between 0 ° and 90 °.
  • the flame protection shield 18 preferably projects beyond the surface 16 of the cylinder head 4 facing the combustion chamber by a certain amount, which is dependent on the height of the cone projected onto the wall 17 or the angle of inclination ⁇ .
  • the conical or frustoconical flame shield 18 is first at a shoulder 19 at a first angle ßj . and in the further course m an area 22 adjoining the extension 19 is inclined at a second angle ⁇ 2 with respect to the wall 17 of the receiving bore 3.
  • the second angle ß 2 is larger or the same size as the first angle ßi, the size of ß 2 between 0 ° and 180 ° and the size of ß] _ between 0 ° and 90 °.
  • the number of changes in inclination can also be two or more, so that several differently inclined regions adjoin one another.
  • 3C shows a third embodiment of the flame protection shield 18 according to the invention, the shape of a partial sphere having been chosen here, the radius R of which determines the height of the flame protection shield 18 and thus the installation depth of the fuel injection valve 2 in the cylinder head 4.
  • the flame shield on the fuel injector 2 for example on the valve seat body 14 is formed, as shown schematically in FIGS. 4A to 4C, similar shapes on the wall 17 of the receiving bore 3 of the cylinder head 4 are attached downstream of the fuel injector 2.
  • the conical, truncated cone or partially spherical flame protection shield 18 is fixed in a suitable manner on the wall 17 and, depending on the requirements for the installation depth of the fuel injection valve 2, projects beyond the surface 16 of the cylinder head 4 facing the combustion chamber.
  • the flame protection shield 18 is attached in the same position relative to the surface 16 of the cylinder head 4 facing the combustion chamber as in the embodiment shown in FIG. 3A, while the extension 19 of the flame protection shield 18 shown in FIG. 4B is in the direction of the mouth of the ' receiving bore 3 is shifted into the combustion chamber.
  • the approach 19 of the flame protection shield 18 can be formed in particular at the transition of the wall 17 of the receiving bore 3 into the surface 16 of the cylinder head 4.
  • the inclination angles ⁇ x and ⁇ 2 can take up a larger angular range than in the exemplary embodiment shown in FIG. 3B.
  • the size of ß can be between -90 ° and 270 ° and the size of ß ⁇ . be between -90 ° and 90 °.
  • flame protection shields 18 designed according to the invention can also be in the form of partial shields 20, as shown in FIG. 5.
  • FIG. 5 shows an example of a fuel injection system . 1 with one
  • Fuel injector 2 which is six on a circle arranged spray openings 21, which are shielded by two partial shields 20, which occupy an angular range of q ⁇ or ⁇ 2 , which need not necessarily be the same size.
  • the number of partial shields 20 is freely selectable and can be matched, for example, to the number of spray openings 21 or the geometry of the mixture cloud injected into the combustion chamber.
  • Fig. 6 is a further measure to improve the protective function displays of the flame shield 18, 20.
  • the flame shield 18, provided with an additional shield 24 20 ' which is disposed radially inwardly into the flame shield 18, 20 and extends up to the outflow-side end face 15 of the valve seat body 14 extends.
  • the hollow-conical structure of the resulting overall shield 18, 20, 24 enables a flow-dynamically improved shielding of the spray openings 21 of the fuel injector 1.
  • a similar arrangement can also be produced in that the flame-retardant shield 18, 20 has an extension 25 formed in one piece with it in the axial direction, which is bent radially inward and also extends to the downstream end face 15 of the valve seat body 14.
  • the invention is not limited to the exemplary embodiments shown and can be used for any forms of flame protection shields 18, which can be fixed in any way on the wall 17 of the receiving bore 3 or on the spray-side end of the fuel injection valve 2, and for any construction of fuel injection valves 1.

Landscapes

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

Abstract

Système d'injection (1) de carburant pour un moteur à combustion interne, qui comporte une soupape (2) destinée à l'injection de carburant dans une chambre de combustion et placée dans un trou récepteur (3) d'une culasse (4) de cylindre du moteur à combustion interne, la soupape étant séparée de manière étanche de la chambre de combustion par un élément d'étanchéité (13). Un écran de protection (18 ; 20) contre les flammes est placé dans le trou récepteur (3), du côté injection de la soupape (2) d'injection de carburant, ledit écran protégeant des orifices d'injection (21) de la soupape (2) d'injection de carburant contre la chambre de combustion du moteur à combustion interne. L'écran de protection (18 ; 20) contre les flammes est placé sur une extrémité (23), située du côté injection, de la soupape (2) d'injection de carburant ou sur une paroi (17) du trou récepteur (3) de la culasse (4) de cylindre, du côté injection de la soupape (2) d'injection de carburant.
EP02754213A 2001-08-29 2002-06-14 Systeme d'injection de carburant Withdrawn EP1423602A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10142299A DE10142299A1 (de) 2001-08-29 2001-08-29 Brennstoffeinspritzsystem
DE10142299 2001-08-29
PCT/DE2002/002175 WO2003027486A1 (fr) 2001-08-29 2002-06-14 Systeme d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1423602A1 true EP1423602A1 (fr) 2004-06-02

Family

ID=7696978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02754213A Withdrawn EP1423602A1 (fr) 2001-08-29 2002-06-14 Systeme d'injection de carburant

Country Status (6)

Country Link
US (1) US6848425B2 (fr)
EP (1) EP1423602A1 (fr)
JP (1) JP2005504217A (fr)
KR (1) KR20040029045A (fr)
DE (1) DE10142299A1 (fr)
WO (1) WO2003027486A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005006641A1 (de) * 2005-02-14 2006-08-24 Siemens Ag Einspritzventil zum Einspritzen von Kraftstoff und Zylinderkopf
EP2148082B1 (fr) * 2008-07-24 2011-10-19 Continental Automotive GmbH Arrangement de couplage pour une soupape d'injection et soupape d'injection
US7823565B2 (en) * 2009-01-14 2010-11-02 Ford Global Technologies Fuel injection system for internal combustion engine with injector isolator ring
JP2010185323A (ja) * 2009-02-11 2010-08-26 Denso Corp 燃料噴射弁の取付け構造およびそれに用いる燃料噴射弁の座金
JP4913174B2 (ja) * 2009-03-30 2012-04-11 愛知機械工業株式会社 インジェクタの取付構造およびシリンダヘッド側部材並びにこれを備える内燃機関
US9284932B2 (en) 2010-03-25 2016-03-15 Denso International America, Inc. Mounting structure for fuel injector
WO2011121728A1 (fr) * 2010-03-30 2011-10-06 トヨタ自動車 株式会社 Isolateur de vibration pour injecteur de carburant et structure porteuse pour injecteur de carburant
WO2012014326A1 (fr) 2010-07-30 2012-02-02 トヨタ自動車 株式会社 Isolateur amortisseur de vibrations pour injecteur de carburant
JP6081095B2 (ja) * 2012-07-17 2017-02-15 Nok株式会社 シール構造
KR101767353B1 (ko) 2013-10-15 2017-08-10 콘티넨탈 오토모티브 게엠베하 연료 분사기 및 연료 분사 시스템

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Also Published As

Publication number Publication date
DE10142299A1 (de) 2003-04-17
KR20040029045A (ko) 2004-04-03
WO2003027486A1 (fr) 2003-04-03
US6848425B2 (en) 2005-02-01
US20040094129A1 (en) 2004-05-20
JP2005504217A (ja) 2005-02-10

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