EP1745210B1 - Ensemble buse et soupape d'injection - Google Patents

Ensemble buse et soupape d'injection Download PDF

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Publication number
EP1745210B1
EP1745210B1 EP05743039A EP05743039A EP1745210B1 EP 1745210 B1 EP1745210 B1 EP 1745210B1 EP 05743039 A EP05743039 A EP 05743039A EP 05743039 A EP05743039 A EP 05743039A EP 1745210 B1 EP1745210 B1 EP 1745210B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
recess
nozzle needle
axial end
needle
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.)
Expired - Fee Related
Application number
EP05743039A
Other languages
German (de)
English (en)
Other versions
EP1745210A1 (fr
Inventor
Willibald SCHÜRZ
Martin Simmet
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
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP1745210A1 publication Critical patent/EP1745210A1/fr
Application granted granted Critical
Publication of EP1745210B1 publication Critical patent/EP1745210B1/fr
Expired - Fee Related 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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • 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
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow

Definitions

  • the invention relates to a nozzle assembly and an injection valve, which comprises the nozzle body and is suitable for metering fuel into a combustion chamber of a cylinder of an internal combustion engine.
  • An injection valve comprises a nozzle assembly having a nozzle body with a recess into which a nozzle needle is introduced.
  • the nozzle needle is axially movable in the recess and closes in a closed position an injection nozzle and releases it in other positions and thus allows a metering of fuel.
  • an actuator is further provided, which acts on the nozzle needle.
  • a fuel injector is known with a front housing and a rear housing. Further, the fuel injector includes a nozzle needle which is guided in its axial movement by nozzle needle guides which are attached to the front housing. To fuel to be able to flow through the nozzle needle guides, the nozzle needle guides have recesses.
  • an injector is known with a nozzle needle and a spring. A force transmission from the spring to the nozzle needle via a formed on the nozzle needle annular shoulder.
  • a fuel injection valve which has an actuator piston with a shoulder ring on which a spring element is supported.
  • An injection valve is known with a nozzle body having a recess in which a nozzle needle is received.
  • a guide region is formed for guiding the nozzle needle.
  • grooves are formed through which fluid can flow.
  • an injection valve is known with a housing and a nozzle needle. In the region of a guide of the nozzle needle this is provided with axially extending flats.
  • the object of the invention is to provide a nozzle assembly and an injection valve, which is or is simple and can be precisely controlled.
  • the invention is characterized by a nozzle assembly having a nozzle body with a recess into which a nozzle needle is inserted and at one axial end of an injection nozzle is formed, which has axially adjacent to the injection nozzle a first guide region for the nozzle needle, the at least one cross-sectional widening has, which extends to the other axial end.
  • the recess is designed to supply fluid to the injection nozzle.
  • a guide bush is introduced, which forms a second guide region for the nozzle needle and which is designed to pass fuel radially outside the second guide region.
  • the invention is further characterized by an injection valve with an injector housing, in which an actuator is arranged, and with the nozzle assembly.
  • the guide bushing makes it possible to dispense with a reduction in the cross-sectional area of the nozzle needle in the second guide region. This can easily be ensured a very high rigidity of the nozzle needle.
  • a high rigidity of the nozzle needle allows a precise movement of the nozzle needle even with a small available stroke of the actuator. Due to the at least one cross-sectional widening of the recess, the volume available for the fluid to be metered is increased in the recess upstream of the guide bushing. In this way, pressure pulsations of the fluid can be damped in the region of the recess, which arise after the release of the injection nozzle or after the closing of the injection nozzle. On the one hand, this leads to a more precise metering of fluid and, on the other hand, also increases the service life of the nozzle body.
  • the nozzle assembly has a coupling element which is fixed on the nozzle needle. An axial end of a bellows is coupled to the coupling element. Further, a sleeve-shaped spring holder is coupled to the coupling element, on which an axial end of a return spring for the nozzle needle is supported. The return spring is formed overlapping the bellows.
  • the nozzle needle can thus be made of a good curable material without regard to suitable material properties for other methods of connection with the coupling element, such as welding.
  • both the return spring and the bellows with the nozzle needle can be coupled by means of the coupling element.
  • the pen holder is sleeve-shaped.
  • the bellows and the return spring are arranged axially overlapping.
  • a smaller axial length of the nozzle needle is necessary, which has a higher rigidity of the nozzle needle result.
  • a better power transmission from the actuator via the nozzle needle is possible because forces acting radially in the nozzle spring can be compensated by the sleeve-shaped spring holder and thus are transmitted to the nozzle needle only to a limited extent.
  • the guide bush is fixed by means of a press fit in the recess of the nozzle body.
  • the bellows is coupled at its other axial end with a sleeve which is applied to the nozzle needle and is radially outwardly sealingly coupled to a cover plate having a recess which penetrates the nozzle needle.
  • a sleeve which is applied to the nozzle needle and is radially outwardly sealingly coupled to a cover plate having a recess which penetrates the nozzle needle.
  • the cover plate is coupled by means of a laser solder connection to the nozzle body.
  • a laser solder connection to the nozzle body.
  • An injector often referred to as an injector has an injector 1, in which an actuator designed as a piezo actuator 2 is arranged. Furthermore, a compensation element 4, which is preferably a hydraulic compensating element, is preferably arranged in the injector housing 1 and compensates for different thermal expansion coefficients of the piezoactuator 2 and of the injector housing 1.
  • the injection valve further comprises a nozzle body 6 with a recess 8, in which a nozzle needle 10 is introduced. At an axial end of the recess 8, an injection nozzle 12 is formed.
  • the nozzle needle 10 is axially movable in the recess 8. In its closed position, the in FIG. 1 A suitable axial extent of the piezoactuator 2 leads to a movement of the nozzle needle 10 out of its closed position and thus to a release of the fuel flow through the injection nozzle 12th
  • a first guide region 14 is formed on the wall of the recess 8 in axial proximity to the injection nozzle 12. Subsequent to the first guide region 14, the recess 8 has a first extension 16 of its cross section at a corresponding axial distance then a second extension 18 of its cross section. It can also have additional extensions of its cross section.
  • the recess 8 can thus be made by simply drilling with drills of different diameters.
  • a guide bush 20 is inserted into the recess 8.
  • the guide bush 20 has a second guide region 22 for the nozzle needle 10. It is preferably pressed with the nozzle body 6. Furthermore, it is designed to pass fuel, which can be supplied via a high-pressure bore 26 to the recess 8.
  • the guide bush 20 preferably on its radial circumference on portions which are set back radially in comparison to the radius of the recess 8 in the region of the second extension 18 of the cross section. This can be easily achieved by one or more flat surfaces. This then has the consequence that in a partial region of the circumference of the guide bush 20 between it and the nozzle body, a gap 24 is formed.
  • the fuel in the region of the guide bush 20 can also be passed through the recess 8 through another suitable design of the guide bush 20.
  • one or more axial bores can be formed radially outside the second guide region 22 in the guide bushing.
  • both the nozzle body 6 and the guide bush 20 are formed of a good hardenable material, preferably a steel with a high carbon content. In this way, a favorable for the guide portions 14, 22 high hardness can be easily realized.
  • a return spring 28 is further arranged, which is supported at its one free axial end on a shoulder 30 of the nozzle body 1.
  • 28 may be inserted between the shoulder 30 and the one free axial end of the return spring also a shim.
  • the restoring spring 28 is supported on a spring holder 32, namely on a collar 34 of the spring holder 32.
  • the spring holder 32 is mechanically coupled by means of a coupling element 36 with the nozzle needle 10 and biases them into their closed position.
  • the spring holder 32 has a sleeve-shaped region which extends in the axial direction coaxially with the nozzle needle 10.
  • the spring holder 32 is coupled by means of a positive connection with the coupling element 36.
  • it may also be coupled to the coupling elements 36, for example, by welding or soldering.
  • the coupling element 36 is coupled by means of a press fit with the nozzle needle 10.
  • the nozzle needle is preferably coated with a lubricant which comprises Teflon for applying the coupling element 36 and then the coupling element 36 is pressed onto the nozzle needle 10 by appropriate application with a corresponding force.
  • the interference fit between the coupling element 36 and the nozzle needle 10 has the advantage that an otherwise necessary welding for mechanical coupling of the coupling element 36 with the nozzle needle 10 can be omitted and thus the nozzle needle can be made of a very good curable material, which is generally unsuitable is for welding.
  • a bellows 38 is further coupled to the coupling element 36 at its one free axial end.
  • the bellows 38 is preferably made of metal.
  • the bellows 38 is preferably welded to the coupling element 36.
  • At its other axial end of the bellows 38 is coupled to a sleeve 40, and also preferably by means of a welded connection.
  • the sleeve 40 is also sealingly connected to a cover plate 42 at its outer periphery.
  • the cover plate 42 is sealingly connected to the nozzle body 6 in a region 44. In this way, it can be easily ensured that the fuel located in the recess 8 does not reach the piezoactuator 2.
  • the cover plate 42 is preferably connected in the region 44 with the nozzle body 6 by means of a laser solder connection.
  • the solder used is preferably a silver-containing solder.
  • Silver-containing solder is characterized by a relatively low melting temperature and thus the required thermal energy during the soldering process is relatively low.
  • soldering by means of a laser is characterized by the fact that the thermal energy can be locally supplied very precisely and thus can be locally supplied accordingly limited, which means that the adjacent components heat only insignificantly during soldering. This is particularly advantageous in connection with the return spring 28, since its spring stiffness can change permanently with correspondingly high heating of the return spring 28.
  • the nozzle body 6, the nozzle needle 10, the guide bush 20, the return spring 28, the spring holder 32, the coupling element 36, the bellows 38, the sleeve 40 and the cover plate 42 form a nozzle assembly.
  • the nozzle assembly is coupled to the injector housing 1 by means of a nozzle lock nut 46.
  • a nozzle lock nut 46 By the formation of the nozzle lock nut 46, the nozzle body 6, the cover plate 42 and the injector housing 1, as shown in the FIG. 1 is shown, it is ensured that in the area 44 no strong tensile forces must be transmitted.
  • the preferred solder joint between the cover plate 42 and the nozzle body 6 must therefore be able to fulfill substantially only a sealing function.
  • the nozzle body 6 may also be welded to the cover plate 42.
  • the design of the coupling element 36, the spring holder 32 can also be independent of the guide bush 20.

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 (6)

  1. Ensemble de buse comportant un corps d'injecteur (6) avec un évidement (8), dans lequel est insérée une aiguille d'injecteur (10) et à une des extrémités axiales duquel est réalisé un injecteur (12), lequel évidement comporte, dans le sens axial à proximité de l'injecteur (12), une première zone de guidage (14) pour l'aiguille d'injecteur (10), laquelle comporte au moins un élargissement de section qui s'étend vers l'autre extrémité axiale de l'évidement (8), ledit évidement (8) étant agencé pour l'acheminement d'un fluide vers l'injecteur (12), et dans l'évidement (8), dans une zone partielle de l'élargissement de section, est insérée une douille de guidage (20), qui comporte une deuxième zone de guidage (22) pour l'aiguille d'injecteur (10) et qui est réalisée pour canaliser le fluide dans le sens radial à l'extérieur de la deuxième zone de guidage (22), un élément de couplage (36) étant prévu, qui est fixé sur l'aiguille d'injecteur (10), auquel est couplée une extrémité axiale d'un soufflet (38) et auquel est couplé un support de ressort (32) en forme de manchon sur lequel prend appui une extrémité axiale d'un ressort de rappel (28) qui est réalisé de manière à recouvrir le soufflet dans le sens axial.
  2. Ensemble de buse selon la revendication 1,
    dans lequel la douille de guidage (20) est fixée dans l'évidement (8) au moyen d'un assemblage par pression.
  3. Ensemble de buse selon l'une quelconque des revendications précédentes,
    dans lequel l'élément de couplage (36) est fixé sur l'aiguille d'injecteur (10) au moyen d'un assemblage par pression.
  4. Ensemble de buse selon l'une quelconque des revendications précédentes,
    dans lequel le soufflet (38), au niveau de son autre extrémité axiale, est couplé à un manchon (40), qui est emmanché sur l'aiguille d'injecteur (10) et qui est couplé radialement à l'extérieur de manière étanche avec une plaque de recouvrement (42), qui est munie d'un évidement (8) à travers lequel passe l'aiguille d'injecteur (10).
  5. Ensemble de buse selon la revendication 4,
    dans lequel la plaque de recouvrement (42) est couplée au corps d'injecteur (6) au moyen d'un assemblage par brasage au laser.
  6. Soupape d'injection avec un ensemble de buse selon l'une quelconque des revendications précédentes,
    un boîtier d'injecteur (1) et un mécanisme de réglage, qui agit sur l'aiguille d'injecteur (10).
EP05743039A 2004-05-14 2005-05-02 Ensemble buse et soupape d'injection Expired - Fee Related EP1745210B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024119A DE102004024119B4 (de) 2004-05-14 2004-05-14 Düsenbaugruppe und Einspritzventil
PCT/EP2005/051985 WO2005111407A1 (fr) 2004-05-14 2005-05-02 Ensemble buse et soupape d'injection

Publications (2)

Publication Number Publication Date
EP1745210A1 EP1745210A1 (fr) 2007-01-24
EP1745210B1 true EP1745210B1 (fr) 2008-09-10

Family

ID=34968376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05743039A Expired - Fee Related EP1745210B1 (fr) 2004-05-14 2005-05-02 Ensemble buse et soupape d'injection

Country Status (5)

Country Link
US (1) US7934669B2 (fr)
EP (1) EP1745210B1 (fr)
JP (1) JP4473915B2 (fr)
DE (2) DE102004024119B4 (fr)
WO (1) WO2005111407A1 (fr)

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DE102011087005A1 (de) * 2011-11-24 2013-05-29 Robert Bosch Gmbh Ventil zum Zumessen eines strömenden Mediums
CN104081033B (zh) 2012-02-13 2017-05-17 现代重工业株式会社 气体注入用单向阀驱动装置
US9416709B2 (en) * 2012-06-15 2016-08-16 Continental Automotive Systems, Inc. Coking resistant after-treatment dosing value
US20140054396A1 (en) * 2012-08-21 2014-02-27 International Engine Intellectual Property Company, Llc Fluid injector
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DE102022206220A1 (de) 2022-06-22 2023-12-28 Robert Bosch Gesellschaft mit beschränkter Haftung Brennstoffventil zur dosierten Abgabe von Brennstoff

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Also Published As

Publication number Publication date
US7934669B2 (en) 2011-05-03
JP2007537391A (ja) 2007-12-20
DE102004024119A1 (de) 2005-12-08
DE102004024119B4 (de) 2006-04-20
JP4473915B2 (ja) 2010-06-02
WO2005111407A1 (fr) 2005-11-24
EP1745210A1 (fr) 2007-01-24
US20070210189A1 (en) 2007-09-13
DE502005005334D1 (de) 2008-10-23

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