EP2891789B1 - Injecteur de carburant et procédé de fabrication d'un injecteur de carburant - Google Patents

Injecteur de carburant et procédé de fabrication d'un injecteur de carburant Download PDF

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Publication number
EP2891789B1
EP2891789B1 EP14195983.3A EP14195983A EP2891789B1 EP 2891789 B1 EP2891789 B1 EP 2891789B1 EP 14195983 A EP14195983 A EP 14195983A EP 2891789 B1 EP2891789 B1 EP 2891789B1
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EP
European Patent Office
Prior art keywords
fuel injector
recess
pressure chamber
pressure
radially
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
EP14195983.3A
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German (de)
English (en)
Other versions
EP2891789A1 (fr
Inventor
Holger Rapp
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
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2891789A1 publication Critical patent/EP2891789A1/fr
Application granted granted Critical
Publication of EP2891789B1 publication Critical patent/EP2891789B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
    • 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
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1, as he, for example, from DE 10 2009 002 554 A1 Furthermore, the invention relates to a method for producing a fuel injector according to the invention.
  • the known fuel injector is used for injecting fuel into the combustion chamber of a self-igniting internal combustion engine.
  • the fuel injector has a multipart injector housing, which forms a high-pressure space in a partial area.
  • a guide piece for a coupler piston is arranged, which serves for the at least indirect control of the lifting movement of a nozzle needle arranged in a liftable manner in the injector housing.
  • the high pressure chamber is connected on the one hand via a bore formed within the injector with a high pressure source (rail), and on the other hand is hydraulically in communication with injection openings formed in the injector.
  • Such a high-pressure space forming a relatively large storage volume also serves, in particular, as a storage medium close to the nozzle and causes the amplitudes of pressure oscillations, which arise as a result of the injections when releasing the injection openings, to be considerably reduced. Furthermore, the need for relatively costly trained deep hole bores is at least partially reduced by such a high-pressure space. If, as in the cited prior art, additional components are arranged within the high-pressure chamber, it is necessary to form the injector housing in the region of the components or the high-pressure chamber with a relatively small wall thickness, since the outer diameter of the injector due to the installation space determined by the internal combustion engine usually limited.
  • the present invention seeks to further develop a fuel injector according to the preamble of claim 1 such that the possible system pressure can be increased within a high-pressure chamber with constant inner and outer dimensions of the injector only by constructive measures without For example, materials with higher strength must be used.
  • the high-pressure chamber is limited at least partially by two elements, an inner first, preferably sleeve-shaped element having a first element arranged in the first recess for forming the high-pressure chamber, and a second element immediately surrounding the first element with a second recess, wherein the second recess, the first element surrounds its outer peripheral surface, and wherein the second element is connected to form a radially acting pressure force on the first element with this.
  • the first recess is arranged eccentrically in the first element and in the region of the first element having the greatest wall thickness, a bore arranged parallel to a longitudinal axis is formed. This bore can serve in particular the leadership of fuel or the like.
  • This compressive force causes compressive stresses to arise within the wall of the inner element in the side facing the high-pressure chamber which counteract the tensile stresses caused as a result of the system pressure and thus at least partially compensate for them.
  • the tensile stresses occurring on the inner wall of the inner element are less than tensile stresses that would occur without the outer element in the wall of the inner element.
  • a press fit is formed between the outer diameter of the first element and the inner diameter of the second element.
  • the second element is sleeve-shaped, wherein the second recess is arranged eccentrically in the second element.
  • first element projects axially beyond the second element at least on one end face, preferably on both end faces, in the non-assembled state.
  • the high-pressure chamber is sealed radially and securely over the radially inner first element safely and reliably, so that leakage of fuel in the direction of the second element is avoided ,
  • an axial compressive stress can be formed between the first element and at least one component axially delimiting the first element.
  • Such axial compressive stress can be achieved in practice by means of axial clamping elements, for example a union nut or the like.
  • the use of the invention is particularly useful in applications in which the pressure in the high-pressure chamber is more than 2500 bar, in particular up to 3000 bar or above.
  • Such a fuel injector is usually exposed to different operating conditions or operating temperatures, which may range in the case of cold start, for example, from -30 ° C to more than 150 ° C during operation.
  • different operating conditions or operating temperatures which may range in the case of cold start, for example, from -30 ° C to more than 150 ° C during operation.
  • the coefficient of thermal expansion of the radially inner element be equal or is greater than the thermal expansion coefficient of the radially outer element. In the simplest case, this condition is fulfilled if the radially inner element and the radially outer element consist of the same material.
  • the invention also includes a method for producing a fuel injector according to the invention, in which two elements radially surrounding one another are joined together. According to the invention, it is provided that the radially inner element is cooled down before the joining and / or the radially outer element is heated.
  • the erfindüngssiee method thus allows the two elements mechanically relatively low-stress mounting in which in particular an exciting removal of surfaces of the two elements is safely and reliably avoided.
  • the Indian Fig. 1 shown fuel injector 10 is used for injecting fuel into the combustion chamber of a self-igniting internal combustion engine, not shown.
  • the fuel injector 10 has a multi-part injector housing 11, in which in a longitudinal axis 12, a nozzle needle 13 is arranged as a liftable injection valve member.
  • the nozzle needle 13 closes in the in the Fig. 1 shown lowered position of the nozzle needle 13 at least one, formed in the injector 11 injection port 14th
  • the injector housing 11 consists of a nozzle body 15 facing the combustion chamber of the internal combustion engine, on the side remote from the combustion chamber in the axial direction a pressure body 18 formed of two elements 16, 17, an intermediate plate 19, a holding body 20 and a housing cover 21 connect.
  • the nozzle body 15 has a radially circumferential retaining collar 22 which cooperates with a sleeve-shaped nozzle retaining nut 25, which in turn on the side facing away from the retaining collar 22 on its inner circumference has a thread 26 which cooperates with a corresponding external thread on the holding body 20 to between the nozzle body 15 and the holding body 20 to compress the pressure body 18 and the intermediate plate 19 axially.
  • a high-pressure chamber 30 is spatially limited, via a formed in the intermediate plate 19, the holding body 20 and the housing cover 21 depth bore 32 hydraulically with a high-pressure accumulator in the form of a rail 33 is connected.
  • the rail 33 provides the system pressure required during operation of the fuel injector 10, which at least substantially also prevails within the high-pressure chamber 30, wherein the system pressure may be more than 2500 bar, in particular up to 3000 bar.
  • an actuating element in the form of a piezo-actuator 35 is arranged, which serves for the at least indirect control of the lifting movement of the nozzle needle 13, wherein the piezo-actuator 35 is electrically actuated via connecting lines 36 and actuated.
  • the limited by the holding body 20 and the housing cover 21 receiving space 37 for the piezo-actuator 35 forms a low-pressure chamber of the injector 11, which is depressurized via a return line 38.
  • a guide piece 40 is arranged in the region of the pressure body 18, which has a blind hole for receiving a coupler piston 41 on the side facing the nozzle needle 13. Further, in a guide piece 40 and the intermediate plate 19 traversing longitudinal bore a piston portion 42 is arranged, which is arranged in operative connection with the piezoelectric actuator 35.
  • the coupler piston 41 acts on the nozzle needle 13 facing, protruding from the blind hole of the guide piece 40 end face with a plate 43 together, on which a spring 44 is supported. The spring 44 loads the coupler piston 41 with an axial force acting in the direction of the piezoactuator 35.
  • a guide sleeve 45 On the side facing away from the coupler piston 41 side of the plate 43 is located on a guide sleeve 45 axially, into which the one end portion of the nozzle needle 13 is immersed.
  • a compression spring 48 is supported, on the one hand axially presses the guide sleeve 45 to form a sealing seat against the plate 43, and on the other hand, the nozzle needle 13 in the direction of its closed position kraftbeaufschlagt in which the at least one injection opening 14 is hydraulically sealed by the nozzle needle 13.
  • Essential to the invention is the structural design of a pressure medium 18 forming a boundary of the high-pressure chamber 30, consisting of the two elements 16, 17.
  • the two elements 16, 17 are each sleeve-shaped and have a common longitudinal axis 49. It is essential to the invention that to form an interference fit in the joined state of the two elements 16, 17, the outer diameter D of the radially inner first element 16 is slightly larger than the inner diameter d of the radially outer second element 17. After the axial joining of the two elements 16, 17 is thereby generated in the outer peripheral wall 51 of the radially inner member 16, a compressive stress.
  • the radially inner element 16 has a first recess 52 which directly delimits the high-pressure chamber 30, while the radially outer element 17 has a second recess 53 for receiving the radially inner element 16.
  • the two elements 16, 17 each have the same axial extent or length I.
  • the joining of the two elements 16, 17 is preferably carried out by heating the radially outer element 17 and / or cooling the radially inner element 16, so that after the joining of the two elements 16, 17, the two end faces of the elements 16, 17 flush complete each other.
  • Fig. 4 the course of the tensile stress ⁇ of the two elements 16, 17 is shown, as it adjusts itself from the longitudinal axis 49 at a distance r due to a (hydraulic) pressure prevailing in the high-pressure chamber 30.
  • the pressure or the corresponding tensile stress acting in the lateral surface 51 of the radially inner element 16 is reduced with increasing distance r as a result of the compressive stress induced in the radially inner element 16 by the radially outer element 17 and only in the region of second recess 53 of the radially outer member 17 occupies its maximum.
  • the radially inner member 16 has a slightly greater length I than the radial outer element 17, so that in the joined state of the two elements 16, 17, the radially inner element 16 protrudes with its end face 55, at least on one, preferably at both end faces 55 slightly above the end face 56 of the radially outer member 17.
  • the radially inner member 16 has a constant wall thickness a
  • the radially outer member 17a viewed in the circumferential direction has a variable wall thickness A, which is caused by the second recess 53a eccentric to the longitudinal axis 54 of the second element 17a is arranged.
  • Last is in the Fig. 8 the case of the invention shown in which in the radially inner member 16 b, which basically according to the radially inner member 16 a of Fig. 7 is formed, in the region of the largest wall thickness a an additional longitudinal bore 60 is formed for guiding pressure medium, wherein the longitudinal axis of the longitudinal bore 60 is parallel to the longitudinal axis 57 of the first recess 52a.

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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 (10)

  1. Injecteur de carburant (10) comprenant un boîtier d'injecteur (11) qui constitue un espace haute pression (30) pouvant être connecté à une source haute pression (33), dans lequel est disposé de manière déplaçable en va et vient un organe de soupape d'injection (13), l'espace haute pression (30) étant limité au moins en partie par deux éléments (16 ; 16a ; 16b, 17 ; 17a), un premier élément intérieur, de préférence en forme de douille (16 ; 16a ; 16b) avec un premier évidement (52 ; 52a) disposé dans le premier élément (16 ; 16a ; 16b) pour constituer l'espace haute pression (30), et un deuxième élément (17 ; 17a) entourant directement le premier élément (16 ; 16a ; 16b), avec un deuxième évidement (53 ; 53a), le deuxième évidement (53 ; 53a) entourant le premier élément (16 ; 16a ; 16b) au niveau de sa surface périphérique extérieure (51), et le deuxième élément (17 ; 17a), en appliquant une force de compression agissant radialement sur le premier élément (16 ; 16a ; 16b), étant connecté à celui-ci,
    caractérisé en ce que
    le premier évidement (52a) est disposé de manière excentrique dans le premier élément (16a ; 16b) et en ce qu'un alésage (60) disposé parallèlement à un axe longitudinal (57) est réalisé dans la région du premier élément (16b) présentant la plus grande épaisseur de paroi (a).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    pour réaliser la force de compression entre, le diamètre extérieur (D) du premier élément (16 ; 16a ; 16b), pour réaliser un ajustement par pressage, est supérieur au diamètre intérieur (d) du deuxième évidement (53 ; 53a) du deuxième élément'(17 ; 17a).
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    le deuxième élément (17) est réalisé en forme de douille et en ce que le deuxième évidement (53) est disposé concentriquement dans le deuxième élément (17).
  4. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    le deuxième élément (17a) est réalisé en forme de douille et en ce que le deuxième évidement (53a) est disposé de manière excentrique dans le deuxième élément (17a).
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    le premier élément (16 ; 16a ; 16b) dépasse axialement au-delà du deuxième élément (17 ; 17a) au moins au niveau d'un côté frontal, de préférence au niveau des deux côtés frontaux, dans l'état non monté dans le boîtier d'injecteur (11).
  6. Injecteur de carburant selon la revendication 5,
    caractérisé en ce
    qu'entre le premier élément (16 ; 16a ; 16b) et au moins un composant (15, 19) limitant axialement le premier élément (16 ; 16a ; 16b) peut être réalisée une contrainte de pression axiale.
  7. Injecteur de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    les deux éléments (16 ; 16a ; 16b ; 17 ; 17a) font partie du boîtier d'injecteur (11).
  8. Injecteur de carburant selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    une pression de plus de 2500 bars règne dans l'espace haute pression (30).
  9. Injecteur de carburant selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    le coefficient de dilatation thermique de l'élément radialement intérieur (16 ; 16a ; 16b) est supérieur ou égal au coefficient de dilatation thermique de l'élément radialement extérieur (17 ; 17a).
  10. Procédé de fabrication d'un injecteur de carburant (10) selon l'une quelconque des revendications 1 à 9, dans lequel deux éléments s'entourant radialement l'un l'autre (16 ; 16a ; 16b, 17 ; 17a) sont assemblés l'un à l'autre,
    caractérisé en ce
    qu'avant l'assemblage, l'élément radialement intérieur (16 ; 16a ; 16b) est refroidi et/ou l'élément radialement extérieur (17 ; 17a) est chauffé.
EP14195983.3A 2013-12-19 2014-12-03 Injecteur de carburant et procédé de fabrication d'un injecteur de carburant Active EP2891789B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013226569.7A DE102013226569A1 (de) 2013-12-19 2013-12-19 Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Publications (2)

Publication Number Publication Date
EP2891789A1 EP2891789A1 (fr) 2015-07-08
EP2891789B1 true EP2891789B1 (fr) 2016-09-28

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ID=52020985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14195983.3A Active EP2891789B1 (fr) 2013-12-19 2014-12-03 Injecteur de carburant et procédé de fabrication d'un injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2891789B1 (fr)
DE (1) DE102013226569A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9788835B2 (en) 2014-09-02 2017-10-17 Ethicon Llc Devices and methods for facilitating ejection of surgical fasteners from cartridges
DE102014222815A1 (de) 2014-11-07 2016-05-12 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4894900A (en) * 1987-06-15 1990-01-23 Stanadyne Automotive Corp. Tool for removing a fuel injection nozzle
JP4058024B2 (ja) * 2004-06-16 2008-03-05 株式会社ケーヒン 電磁式燃料噴射弁
DE102007008863A1 (de) * 2005-08-26 2008-08-28 Robert Bosch Gmbh Brennstoffeinspritzventil
US20100012745A1 (en) * 2008-07-15 2010-01-21 Sturman Digital Systems, Llc Fuel Injectors with Intensified Fuel Storage and Methods of Operating an Engine Therewith
DE102009002554A1 (de) 2008-07-23 2010-01-28 Robert Bosch Gmbh Kraftstoffinjektor für ein Kraftstoffeinspritzsystem
AT512297B1 (de) * 2012-02-07 2013-07-15 Bosch Gmbh Robert Gewindeverbindung von hochdruckmedium führenden komponenten einer einspritzvorrichtung für brennkraftmaschinen
AT511801B1 (de) * 2012-02-07 2013-03-15 Bosch Gmbh Robert Verfahren zur beeinflussung der gewindegeometrie eines innengewindes für brennkraftmaschinen

Also Published As

Publication number Publication date
DE102013226569A1 (de) 2015-06-25
EP2891789A1 (fr) 2015-07-08

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