EP3380716B1 - Injecteur de carburant muni d'un élément d'étanchéité - Google Patents

Injecteur de carburant muni d'un élément d'étanchéité Download PDF

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Publication number
EP3380716B1
EP3380716B1 EP16777656.6A EP16777656A EP3380716B1 EP 3380716 B1 EP3380716 B1 EP 3380716B1 EP 16777656 A EP16777656 A EP 16777656A EP 3380716 B1 EP3380716 B1 EP 3380716B1
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EP
European Patent Office
Prior art keywords
sealing element
fuel injector
sealing
injector according
regions
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
EP16777656.6A
Other languages
German (de)
English (en)
Other versions
EP3380716A1 (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
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3380716A1 publication Critical patent/EP3380716A1/fr
Application granted granted Critical
Publication of EP3380716B1 publication Critical patent/EP3380716B1/fr
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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
    • F02M55/008—Arrangement of fuel passages inside 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector using a sealing element for a high-pressure connection.
  • a sealing element for a fuel injector according to the preamble of claim 1 is known from the DE 102012 222 167 A1 known to the applicant.
  • a high-pressure line to a connection piece in a fuel injector can be sealed by means of the known sealing element.
  • the high-pressure line and the connecting piece are axially clamped to one another by means of a union nut, the sealing element being arranged within bores of the two axially spaced apart components (high-pressure line and connecting piece).
  • the sealing element deforms radially outward and lies with an outer side or an outer circumference, forming a seal, at the mouth regions of the two through bores of the two components.
  • the sealing element has a radially outwardly projecting sealing area in a region that is axially central with respect to a longitudinal axis of the sealing element and that, when the sealing element is not yet axially loaded, has an outer diameter that is larger than the diameter of the bores on the High pressure line and the connecting piece. In the axially clamped state of the sealing element, it also projects radially beyond the bores of the high-pressure line and the connecting piece.
  • the use of the known sealing element is limited to applications in which the components to be connected to one another are axially spaced apart from one another in the final state. This has the consequence that an arrangement consisting of the known sealing element and the two axially adjoining components has a relatively large axial length.
  • a component is also known in which the transition of two components is sealed by a sealing element and an extrusion coating.
  • the invention is based on the object of developing a fuel injector with a sealing element for a high-pressure connection in such a way that it has a particularly compact arrangement of the components with respect to one another in the axial direction in the installed state. In addition, a particularly good sealing effect should be achieved.
  • the invention is based on the idea of enabling at least two first sealing areas which are axially spaced apart from one another in relation to a longitudinal axis of the sealing element so that the at least two first sealing areas can be assigned to the bores of the two components which form the high-pressure connection, such that the sealing areas interact with an inner wall of the bore of the respective component.
  • the fuel injector comprises a sealing element described so far, the sealing element being arranged in the region of a recess formed by two components of the fuel injector, the recess being formed, for example, by two radially circumferential bores or inner walls of the components having the same radius, and wherein the Connect the two components axially to one another, forming a parting plane perpendicular to a longitudinal axis of the sealing element.
  • the fuel injector is characterized in that the two first sealing areas of the sealing element bear tightly against the inner walls of the two bores or components under high pressure.
  • the sealing element is elastically deformable and consists of metal, in particular a steel material.
  • the sealing element In a production-technically preferred embodiment of the sealing element, it has a wave shape in the axial cross section. As a result, the sealing element can be manufactured inexpensively and with high precision in a non-cutting forming process.
  • the sealing element in the unassembled state has a length with respect to its longitudinal axis that is greater than the height of the recess in the assembled state of the two components. This results in an axial shortening of the sealing element during the assembly or the axial bracing of the two components, such that the sealing element with its two opposite end faces seals in the region of the recess is present. A total of at least four sealing areas or sealing surfaces are thus formed between the two components and the sealing element. This results in a particularly safe or improved sealing effect.
  • a further preferred embodiment of the invention provides that, viewed in the direction of the sealing element in the axial direction of the longitudinal axis of the sealing element, sections which form the first sealing areas adjoin the two axial end areas of the sealing element.
  • Such a design of the sealing element has the effect that, when the two components are axially clamped even without hydraulic pressure, the sealing element is mechanically expanded radially by the assembly force, such that the first two sealing areas bear against the inner wall of the two components. This ensures reliable sealing of the high-pressure connection during operation, even with a relatively low hydraulic overpressure.
  • An additional seal is advantageously achieved according to the invention by arranging the two interconnected components in the area of the parting plane of the two components, at least in regions, in contact with one another. This not only limits the axial tensioning path of the two components during their assembly, but also achieves an additional sealing effect through the contact between the two components.
  • a fuel injector 10 is shown in regions as it is used to inject fuel into a combustion chamber (not shown) of a self-igniting internal combustion engine.
  • the fuel injector 10 is designed as a so-called common rail injector.
  • the fuel injector 10 has a nozzle body 11, to which a holding body 12 connects in the opposite direction to the injection openings of the nozzle body 11, not shown.
  • the nozzle body 11 is axially clamped to the holding body 12 by means of a nozzle clamping nut 15.
  • the nozzle body 11 and the holding body 12 are arranged in the assembled state in the region of opposite end faces 16, 17, at least in regions, in contact with one another.
  • the illustrated embodiment ensures that the end faces 16, 17 are machined accordingly so that when the nozzle body 11 is axially mounted on the holding body 12, the two end faces 16, 17 abut one another at least in a radially inner contact region 18.
  • a nozzle needle 20 acting as an injection member is arranged so as to be movable along a longitudinal axis 21.
  • the system pressure which can be, for example, more than 2000 bar, prevails in the recess 19, which is supplied at least indirectly with fuel prevailing under system pressure via a supply line (not shown).
  • the fuel injector 10 has a high-pressure connection 25, in which an in the Fig. 1 and 2nd recognizable sleeve-shaped sealing element 26 is arranged.
  • the sealing element 26 is preferably made of steel and has an undulating axial cross section.
  • the sealing element 26 in relation to its longitudinal axis 27, which in the exemplary embodiment shown coincides with the longitudinal axis 21 of the nozzle needle 20, the sealing element 26 has two axially spaced apart first sealing regions 31, 32 on its outer wall 28.
  • a depression 33 is formed between the two first sealing areas 31, 32, in the area of which the two end faces 16, 17 of the nozzle body 11 or of the holding body 12 or their parting plane also run.
  • the recess 19 is formed in each case by a bore section 34, 35 of the recess 19 in the nozzle body 11 or the holding body 12, which extends from the respective end face 16, 17.
  • the diameter D of the recess 19 is the same, at least in the area of the sealing element 26.
  • the sealing element 26 in the non-assembled state in the region of the two first sealing regions 31, 32 has an outer diameter d that is slightly smaller than the diameter D of the recess 19. This allows the sealing element 26 in Slightly insert in the axial direction into the bore sections 34, 35 of the recess 19. Furthermore, it is advantageous if, in the unassembled state of the sealing element 26, it has a length which is somewhat greater than the height H of the recess 19 when the nozzle body 11 and the holding body 12 are in the assembled state. This results in the axial clamping by means of the nozzle clamping nut 15 an axial sprain or an axial pressing of the sealing element 26 in the recess 19, such that according to the Fig.
  • the sealing element 26 is additionally radially expanded by the hydraulic pressure in the recess 19 such that the two first sealing regions 31, 32 against the corresponding sections of the bore 34 , 35 are pressed. This prevents fuel from escaping in the direction of the two end faces 16, 17 at least in the area of the two areas 31, 32.
  • an additional seal is created by the two second areas 41, 42, as well as by the contact area 18 between the nozzle body 11 and the holding body 12.
  • the sealing element 26a is arranged in the region of the high-pressure connection 25 between the holding body 12 and a valve piece 45.
  • a recess 19a in which the sealing element 26a is arranged, is formed between the holding body 12 and the valve piece 45 by a corresponding design of an outer wall section 46 of the valve piece 45 and a recess 47 in the holding body 12.
  • the sealing element 26a is arranged in the assembled state with a radially inner first sealing area 48 in contact with the outer wall section 46 of the valve piece 45 and forms a hydraulic seal there.
  • the radially inner first sealing area 48 is arranged in relation to the longitudinal axis 27 of the sealing element 26a between the two radially outer sealing areas 31, 32.
  • the holding body 12 is arranged in the region of an end face 49 in contact with an end face 50 of the valve piece 45.
  • the two axial end regions 36, 37 of the sealing element 26a form second sealing surfaces 41, 42 which bear against the valve piece 45 and the holding body 12 in a sealing manner.
  • the fuel injector 10, 10a described so far can be modified or modified in a variety of ways without deviating from the inventive concept.

Landscapes

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

Claims (10)

  1. Injecteur de carburant (10 ; 10a) comprenant un élément d'étanchéité (26 ; 26a) pour une connexion haute pression (25) dans l'injecteur de carburant (10 ; 10a), l'élément d'étanchéité (26 ; 26a) étant réalisé sous forme de douille et présentant, au niveau de sa périphérie extérieure, deux premières régions d'étanchéité (31, 32) saillant radialement vers l'extérieur, qui sont réalisées de manière à s'appliquer contre un composant (11, 12) et qui sont espacées axialement l'une de l'autre par rapport à un axe longitudinal (27) de l'élément d'étanchéité (26 ; 26a), l'élément d'étanchéité (26 ; 26a) étant disposé dans la région d'un évidement (19 ; 19a) réalisé par deux composants (11, 12, 45) de l'injecteur de carburant (10 ; 10a) et les deux composants (11, 12, 45) se raccordant axialement l'un à l'autre perpendiculairement à un axe longitudinal (27) de l'élément d'étanchéité (26 ; 26a),
    caractérisé en ce que
    l'élément d'étanchéité (31, 32) s'élargit radialement sous l'effet d'une sollicitation par haute pression de l'évidement (19 ; 19a) de telle sorte que les deux premières régions d'étanchéité (31, 32) de l'élément d'étanchéité (26 ; 26a) s'appliquent hermétiquement contre l'évidement (19 ; 19a).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce
    qu'il est prévu au moins une troisième première région d'étanchéité (48) saillant radialement vers l'intérieur.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    l'élément d'étanchéité (26 ; 26a) peut être déformé élastiquement et se compose d'un métal, en particulier d'un matériau en acier.
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    l'élément d'étanchéité (26 ; 26a) présente une forme ondulée en section transversale axiale.
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    l'élément d'étanchéité (26 ; 26a) constitue au niveau de ses côtés frontaux opposés des deuxièmes régions d'étanchéité (41, 42).
  6. Injecteur de carburant selon la revendication 5,
    caractérisé en ce que
    des portions faisant saillie obliquement vers l'extérieur (43, 44) du côté opposé aux deuxièmes régions d'étanchéité (41, 42) se raccordent aux deux deuxièmes régions d'étanchéité (41, 42) dans la direction de l'axe longitudinal (27) de l'élément d'étanchéité (26 ; 26a) et se prolongent par les premières régions d'étanchéité (31, 32).
  7. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'élément d'étanchéité (26 ; 26a), dans l'état non monté, présente, par rapport à son axe longitudinal (27), une longueur supérieure à la hauteur (H) de l'évidement (19 ; 19a) dans l'état monté des deux composants (11, 12, 45).
  8. Injecteur de carburant selon la revendication 1 ou 7,
    caractérisé en ce que
    les deux composants (11, 12, 45) sont disposés au moins en partie en contact d'appui l'un avec l'autre.
  9. Injecteur de carburant selon l'une quelconque des revendications 1, 7 et 8,
    caractérisé en ce que
    l'élément d'étanchéité (26) est disposé entre un corps de retenue (12) et un corps de buse (11).
  10. Injecteur de carburant selon l'une quelconque des revendications 1, 7 et 8,
    caractérisé en ce que
    l'élément d'étanchéité (26a) est disposé entre une pièce de soupape (45) et un corps de retenue (12).
EP16777656.6A 2015-11-26 2016-09-29 Injecteur de carburant muni d'un élément d'étanchéité Active EP3380716B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015223440.1A DE102015223440A1 (de) 2015-11-26 2015-11-26 Dichtelement und Kraftstoffinjektor mit einem Dichtelement
PCT/EP2016/073323 WO2017089013A1 (fr) 2015-11-26 2016-09-29 Élément d'étanchéité et injecteur de carburant muni d'un élément d'étanchéité

Publications (2)

Publication Number Publication Date
EP3380716A1 EP3380716A1 (fr) 2018-10-03
EP3380716B1 true EP3380716B1 (fr) 2020-05-06

Family

ID=57083293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16777656.6A Active EP3380716B1 (fr) 2015-11-26 2016-09-29 Injecteur de carburant muni d'un élément d'étanchéité

Country Status (5)

Country Link
EP (1) EP3380716B1 (fr)
KR (1) KR20180085765A (fr)
CN (1) CN108495994B (fr)
DE (1) DE102015223440A1 (fr)
WO (1) WO2017089013A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919231C2 (de) * 1989-06-13 1997-03-06 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE10149514A1 (de) * 2001-10-08 2003-04-24 Bosch Gmbh Robert Kraftstoffinjektor mit Kompensationselement für Kraftstoffeinspritzsysteme
DE102006048727A1 (de) * 2006-10-16 2008-04-17 Robert Bosch Gmbh Kraftstoffinjektor mit Magnetventil
DE102011087954A1 (de) * 2011-12-08 2013-06-13 Robert Bosch Gmbh Einspritzventil, insbesondere für eine Brennkraftmaschine
DE102012204310A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Dicht umspritztes Bauelement und Verfahren zum Herstellen eines solchen Bauelements
EP2700806A1 (fr) * 2012-08-23 2014-02-26 Continental Automotive GmbH Injecteur de carburant, ensemble d'injection de carburant et utilisation d'une bague d'étanchéité
DE102012222167A1 (de) 2012-12-04 2014-06-05 Robert Bosch Gmbh Alternativer Hochdruckanschluss mit Feder-Dichtlinse
CN203670023U (zh) * 2013-11-01 2014-06-25 上海汽车集团股份有限公司 用于喷油器的密封件、喷油器和柴油机
DE102014201854A1 (de) 2014-02-03 2015-08-06 Robert Bosch Gmbh Dichtscheibe für einen Kraftstoffinjektor, sowie Kraftstoffinjektor mit einer derartigen Dichtscheibe

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP3380716A1 (fr) 2018-10-03
KR20180085765A (ko) 2018-07-27
CN108495994B (zh) 2021-06-08
DE102015223440A1 (de) 2017-06-01
WO2017089013A1 (fr) 2017-06-01
CN108495994A (zh) 2018-09-04

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