EP3098434A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant Download PDF

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Publication number
EP3098434A1
EP3098434A1 EP16166081.6A EP16166081A EP3098434A1 EP 3098434 A1 EP3098434 A1 EP 3098434A1 EP 16166081 A EP16166081 A EP 16166081A EP 3098434 A1 EP3098434 A1 EP 3098434A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
ring seal
holding body
sealing element
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
EP16166081.6A
Other languages
German (de)
English (en)
Other versions
EP3098434B1 (fr
Inventor
Stefan Leiser
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 EP3098434A1 publication Critical patent/EP3098434A1/fr
Application granted granted Critical
Publication of EP3098434B1 publication Critical patent/EP3098434B1/fr
Not-in-force 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws

Definitions

  • the invention relates to a fuel injection valve of an internal combustion engine, wherein the fuel injection valve has a holding body and a nozzle body, wherein the holding body and the nozzle body having a central nozzle needle and / or an actuating rod receiving fuel-filled recess, wherein opposite end faces of the holding body and the nozzle body by means of a union nut against each other are tense.
  • Such a fuel injection valve is out of DE 10 2007 016 866 A1 known.
  • This fuel injection valve has a holding body and a nozzle body, which are clamped together by means of a union nut.
  • a first sealing point between the nozzle body and the holding body is located on an annular surface formed in a reduced width of the holding body.
  • This fuel injection valve is provided for arrangement on a combustion chamber of an internal combustion engine and comprises a holding body, which is braced with a nozzle body by means of a union nut.
  • the nozzle body protrudes into the combustion chamber of the internal combustion engine.
  • an opening is preferably inserted into a cylinder head of an internal combustion engine, into which the nozzle body can be inserted by inserting a sealing element.
  • the sealing element is held on the fuel injection valve in the region below the union nut by means of a securing element.
  • the invention has for its object to provide a fuel injection valve having an improved seal.
  • At least one end face has a groove which includes the recess into which a sealing element is inserted.
  • This sealing element is used in the production or assembly of the fuel injection valve in the groove and ensures after the tension of the holding body with the nozzle body through the union nut to the surrounding tight connection of the components.
  • the fuel injection valve is installed in particular in a common rail injection system, wherein in the fuel injection valve in the region of the fuel-filled recess, the system pressure prevails, which may be up to 3000 bar or more. In this case, the fuel injection valve is designed so that no leakage return line is arranged in the holding body.
  • the groove is an annular groove and the sealing element is an annular sealing element.
  • the sealing element is an annular sealing element. This is the preferred embodiment, which can be easily implemented in terms of manufacturing technology.
  • the sealing element has two annular seals comprising the recess with different properties.
  • the first ring seal difficult to deform or possibly undeformable and the second ring seal deformable, in particular easily deformable.
  • the deformable ring seal is plastically deformed during assembly of the fuel injector during assembly of the holding body and the nozzle body with the union nut and thus reduces the sensitivity of the entire association against relevant influencing factors.
  • the hard deformable or non-deformable annular seal of the annular sealing element produces a defined stop and the exact alignment of the holding body with respect to the nozzle body.
  • the first ring seal comprises the second ring seal.
  • This embodiment has proved to be advantageous, namely by the deformable soft ring seal is covered by the hard, difficult to deform or non-deformable ring seal.
  • the first ring seal on a depth exceeding the groove height. This ensures that the orientation of the holding body relative to the nozzle body is effected by the first ring seal as part of the sealing element.
  • the material of the sealing element is a metal material.
  • the inner and the outer ring seal of the sealing element independent parts that consist of different metal materials.
  • the outer ring seal may be made of (optionally) hardened steel while the inner deformable ring seal is formed of, for example, copper or a material having similar properties.
  • the groove is embedded in the holding body.
  • the holding body is usually made of a less high-quality material than the nozzle body and also the Nozzle body is processed higher overall. Accordingly, the end face of the nozzle body facing the holding body is manufactured with a higher surface quality than is the case with the corresponding end face of the holding body.
  • the groove or the annular groove is incorporated in the holding body, only the bottom surface of the annular groove needs to be made with a high surface quality to ensure overall that a dressing consisting of the holding body and the nozzle body is created by the use of the sealing element which is exactly aligned with each other and has the desired improved seal.
  • FIG. 1 shows a partial section through a fuel injection valve in the region of the interaction of a holding body 1 and a nozzle body 3 during assembly.
  • the fuel injection valve is used in particular for injecting diesel fuel into a combustion chamber of an internal combustion engine, which then burns in the combustion chamber to generate work output with combustion air introduced into the combustion chamber at the same time.
  • the fuel injection valve is preferably part of a common-rail fuel injection system, wherein the fuel injection system is supplied in a high-pressure accumulator under a pressure of up to 3,000 bar or more stored fuel for injection.
  • the fuel injection valve has the said holding body 1, in which an actuator, For example, a piezoelectric actuator, for controlling a nozzle needle 2 or an actuating rod for the nozzle needle 2 is arranged.
  • the nozzle needle 2 is guided in the nozzle body 3, wherein the guide portion is not shown in the figure.
  • a nozzle needle tip of the nozzle needle 2 closes injection ports in the nozzle body 3, while in an opening state of the fuel injection valve, the nozzle needle 2 is axially displaced toward the holder body 1 and then the nozzle needle tip releases the injection ports.
  • pending fuel can be injected through the injection openings in the combustion chamber of the internal combustion engine.
  • the closing movement of the nozzle needle 2 is assisted by a nozzle needle spring 4, which is supported on the holding body 1 or a retaining washer arranged between the holding body 1 and the nozzle body 3.
  • a nozzle body 2 receiving holding body space 5 in the holder body 1 and the nozzle needle spring 4 and the nozzle needle 2 receiving spring chamber 6 in the nozzle body 3 are fuel-filled, wherein the pending fuel pressure corresponds to the system pressure of the fuel injection system.
  • the union nut 3 is pushed from below over the nozzle body 3, for example until the investment of a shoulder of the union nut on an annular shoulder of the nozzle body 3, not shown, and screwed with an internal thread 11 on an attached to the holder body 1 external thread 12.
  • the holding body 1 can be reliably connected to the nozzle body 3.
  • annular groove 13 is recessed surrounding the holding body space 5.
  • the ring sealing element 14 has a first, outer ring seal 15a and a second, inner ring seal 15b.
  • the first, outer ring seal 15a is made of a metal material that is difficult to deform or deform, while the second, inner ring seal 15b is made of a soft, preferably easily deformable metal material.
  • the height of the second inner ring seal 15b is in the in FIG. 1
  • the height of the first, outer ring seal 15a is slightly larger than the depth of the annular groove 13th
  • FIG. 2 is the fully assembled fuel injection valve with the finished bolted composite consisting of holding body 1, nozzle body 3 and union nut 8 shown.
  • the second, inner ring seal 15b of the sealing element 14 has deformed so far that the height of this second, inner ring seal 15b is equal to the height of the first, outer ring seal 15a and thus there is a reliable seal and accurate alignment of the aforementioned components to each other.
  • the height of the first, outer ring seal 15a is dimensioned such that there is still a small gap 17 in the region of the opposite end faces 7a, 7b between the holding body 1 and the nozzle body 3.
  • the ring sealing element 14 with the first, outer ring seal 15a and the second, inner ring seal 15b preferably consists of two parts, which are connected to each other in a pre-assembly, for example by inserting the inner ring seal 15b in the outer ring seal 15a, so that in the actual assembly of the fuel injection valve only the prefabricated ring sealing element 14 must be mounted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16166081.6A 2015-05-29 2016-04-19 Systeme d'injection de carburant Not-in-force EP3098434B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015209956.3A DE102015209956A1 (de) 2015-05-29 2015-05-29 Kraftstoffeinspritzsystem

Publications (2)

Publication Number Publication Date
EP3098434A1 true EP3098434A1 (fr) 2016-11-30
EP3098434B1 EP3098434B1 (fr) 2018-10-03

Family

ID=55759566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16166081.6A Not-in-force EP3098434B1 (fr) 2015-05-29 2016-04-19 Systeme d'injection de carburant

Country Status (2)

Country Link
EP (1) EP3098434B1 (fr)
DE (1) DE102015209956A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245826A2 (fr) * 2001-03-28 2002-10-02 Robert Bosch Gmbh Joint d'étanchéité pour un système de carburant haute-pression d'un moteur à combustion interne
DE10229899A1 (de) * 2002-07-03 2004-01-29 Siemens Ag Verfahren zur Herstellung einer Dichtung an einem Injektor sowie Injektor mit verbesserter Hochdruckdichtung
DE102005053112A1 (de) 2005-11-08 2007-05-10 Robert Bosch Gmbh Kraftstoffeinspritzventil mit Sicherung für ein Ventil-Brennraum-Dichtelement
DE102007016866A1 (de) 2007-04-10 2008-10-16 Robert Bosch Gmbh Hochdichter Kraftstoffinjektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245826A2 (fr) * 2001-03-28 2002-10-02 Robert Bosch Gmbh Joint d'étanchéité pour un système de carburant haute-pression d'un moteur à combustion interne
DE10229899A1 (de) * 2002-07-03 2004-01-29 Siemens Ag Verfahren zur Herstellung einer Dichtung an einem Injektor sowie Injektor mit verbesserter Hochdruckdichtung
DE102005053112A1 (de) 2005-11-08 2007-05-10 Robert Bosch Gmbh Kraftstoffeinspritzventil mit Sicherung für ein Ventil-Brennraum-Dichtelement
DE102007016866A1 (de) 2007-04-10 2008-10-16 Robert Bosch Gmbh Hochdichter Kraftstoffinjektor

Also Published As

Publication number Publication date
EP3098434B1 (fr) 2018-10-03
DE102015209956A1 (de) 2016-12-01

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