WO2012010657A2 - Corps de buse comportant un trou borgne - Google Patents

Corps de buse comportant un trou borgne Download PDF

Info

Publication number
WO2012010657A2
WO2012010657A2 PCT/EP2011/062520 EP2011062520W WO2012010657A2 WO 2012010657 A2 WO2012010657 A2 WO 2012010657A2 EP 2011062520 W EP2011062520 W EP 2011062520W WO 2012010657 A2 WO2012010657 A2 WO 2012010657A2
Authority
WO
WIPO (PCT)
Prior art keywords
blind hole
nozzle body
nozzle needle
nozzle
conical
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.)
Ceased
Application number
PCT/EP2011/062520
Other languages
German (de)
English (en)
Other versions
WO2012010657A3 (fr
Inventor
Thomas Hofmann
Wolfgang Gerber
Günger YURTSEVEN
Ferdinand Löbbering
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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies 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 Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2012010657A2 publication Critical patent/WO2012010657A2/fr
Publication of WO2012010657A3 publication Critical patent/WO2012010657A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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

Definitions

  • the invention relates to a nozzle body, in particular for a fuel injector, according to the preamble of claim 1.
  • a generic nozzle body has a nozzle needle recess arranged around a longitudinal axis, comprising a conical nozzle needle seat and a blind hole, from which at least one injection hole projects to an outer surface of the nozzle ⁇ body extends.
  • Such nozzle bodies are used, for example, in diesel injectors.
  • the nozzle body forms a tip of the fuel injector, which protrudes in the installed state into the combustion chamber of an internal combustion engine. For Einsprit ⁇ wetting fuel inside the nozzle body is guided to the inlet hole injection and injected therethrough into the combustion chamber.
  • the nozzle body is manufactured ⁇ det substantially rotationally symmetrical about a central longitudinal axis of the injector.
  • a Düsenna ⁇ delausappelung This opens at the combustion chamber end in a blind hole. At its end facing away from the combustion chamber, it is connected to a high-pressure fuel supply line (eg common rail).
  • a nozzle needle In the Düsennadelausnaturalung a nozzle needle is movably mounted in the axial direction.
  • the SI ⁇ nozzle needle is driven by an actuator, directly or indirectly between an open position and a closed position moved.
  • the nozzle needle recess has a conical nozzle needle seat with a sealing surface.
  • the nozzle needle In the closed state of the valve, the nozzle needle is pressed with a sealing edge on the sealing surface of the nozzle needle seat to form a Dichtsit ⁇ zes. Ector for opening the Kraftstoffinj the SI ⁇ nozzle needle driven by the actuator is off the nozzle needle seat lifted. Once the nozzle needle is moved to an open position and lifts from the sealing seat, fuel can flow under pressure into the underlying blind hole and to the injection holes and be injected into the combustion chamber.
  • the valve needle When the valve needle is moved to a closed position and forms a sealing seat with the nozzle needle seat, the volume in the blind hole is separated from the pressurized fuel supply line.
  • the pressure in the blind hole relaxes through the injection through the injection holes and the pressure in the blind hole drops. Nevertheless, a residue of fuel remains in the volume between the tip of the nozzle needle and the blind hole.
  • Through the injection holes continues to be a direct connection to the combustion chamber. Therefore, small quantities of fuel can enter the combustion chamber of the internal combustion engine even when the injection valve is closed, for example by outgassing. This has a negative effect on the emissions of the internal combustion engine.
  • the invention is therefore based on the object to provide an improved nozzle body with which you can reduce the emissions.
  • the object is achieved by a nozzle body according to independent claim 1, by an arrangement of a nozzle body and a nozzle needle according to claim 8, as well as ei ⁇ NEN Kraftstoffin ector according to claim 9.
  • Advantageous developments of the invention are set forth in the dependent claims.
  • An inventive nozzle body has a central longitudinal axis.
  • a nozzle needle recess is arranged which comprises a conical nozzle needle seat.
  • the nozzle needle seat opens into a blind hole, from which at least one injection hole extends to an outer surface of the nozzle body.
  • the blind hole has a blind hole diameter and it extends from the transition in the axial direction to a blind hole depth.
  • the ratio of blind hole diameter (17) to blind hole depth (18) is greater than or equal to 1.5.
  • blind hole diameter and blind hole depth are usually about the same size, so that a ratio of about 1 or 1: 1 is given. Due to the inventive design of the blind hole as a particularly fla ⁇ ches blind hole, the volume of the blind hole can be reduced ⁇ who.
  • a plurality of injection holes extend from the blind hole to the outer surface of the nozzle body.
  • 4, 6 or 8 injection holes are provided.
  • ratio of blind hole diameter to blind hole depth of at least 1.5 the blind hole volume can be kept very small.
  • the plurality of injection holes are typically distributed symmetrically about the longitudinal axis of the nozzle body and face radially outward from a peripheral wall of the blind hole.
  • the blind hole diameter is therefore also influenced by the number, size and arrangement of the injection holes.
  • the ratio of blind ⁇ hole diameter to blind hole depth invention can thus achieve a particularly flat design of the blind hole.
  • the blind hole diameter is determined at the transition between the conical nozzle needle seat to the blind hole. For example, this transition forms an edge.
  • the reference point used here is, for example, the axial position of the edge, in which the circumferential wall of the nozzle needle opening opens from the conical shape of the nozzle needle seat toward the blind hole, or at which the peripheral wall of the blind hole and the peripheral wall of the nozzle needle seat meet.
  • This axial position serves as a reference point for the determination of the blind hole diameter and also for the determination of the blind hole depth.
  • the largest blind hole depth is usually in the middle on the longitudinal axis of the nozzle body.
  • the blind hole ends in a hollow conical tip.
  • the blind hole depth then refers to the axial distance between the lowest point of the blind hole in the combustion chamber direction and the reference point at the transition to the conical nozzle needle seat as determined above.
  • the volume of the individual injection holes has little design freedom. Thus the leakage of fuel to the injection valve closed at reduced ⁇ the blind hole due to the low volume of the nozzle body according to the invention. This leads to a reduction of emissions.
  • the ratio of blind hole diameter to blind hole depth is at least 1.7, at least 2 or, more preferably, at least 2.3. Also possible and advantageous is a ratio greater than or equal to 3.
  • inventive design of the blind hole is particularly advantageous for directly driven power injectors ⁇ injectors.
  • a service provided by an actuator actuating a servo valve on the nozzle needle übertra ⁇ gen will reflectors stoffin.
  • actuator is a piezo actuator is used for example for use.
  • piezo actuators can only provide a limited stroke available. Through the intermediary of the servo-valve operating stroke can be hydraulically enlarged ⁇ the.
  • Servo valve for transferring the power stroke on the Düsenna ⁇ del interposed.
  • the stroke of the actuator is transferred directly or optionally through a mechanical transmission to the SI ⁇ nozzle needle. Therefore, the maximum needle stroke for Publ ⁇ tion of the fuel injection valve is also specified by the stroke provided by the actuator or limited by this.
  • the cone-shaped nozzle needle seat and the nozzle needle tip cooperating therewith are designed with a large cone angle.
  • the nozzle body according to the invention therefore has a conical nozzle needle seat with an opening angle greater than 100 °, preferably greater than 105 ° and particularly preferably greater than 110 °.
  • the opening angle is smaller than 120 °, and particular ⁇ DERS preferably, less than 115 °.
  • cone or cone angle is the angle enclosed by a conical surface.
  • An opening angle of 100 ° corresponds to ⁇ with an inclination angle of 50 ° between the conical surface and a central longitudinal axis.
  • An elevation angle of the injection holes relative to the longitudinal axis of the nozzle body is defined by the combustion chamber design and the installation situation of the ⁇ Inkjektors in the combustion chamber.
  • injector with several Injection holes in the nozzle body typically have different elevation angles relative to the longitudinal axis.
  • the injection holes with one another can, for example, include a cone angle of up to 160 ° or 165 ° or more.
  • the elevation angle of individual injection holes with respect to the longitudinal axis of the nozzle body can thereby be significantly RESIZE ⁇ SSER than 75 ° or 80 °.
  • a certain minimum depth of the blind hole is therefore advantageous to ensure a suffi ⁇ sponding stability so that the distance between nozzle needle seat and the injection hole can be made sufficiently large.
  • the inventive ratio of blind hole diameter to blind hole depth of at least 1.5, preferably greater than or equal to 1.7, more preferably greater than or equal to 2, and in particular greater or equal to 2.3 or greater than or equal to 3 is found to be advantageous.
  • the blind hole has two adjacent conical regions in the axial direction and a conical region at the tip, wherein the two conical regions and the conical region each have different opening angles ⁇ .
  • a first conical region with a small cone angle From the transition from the nozzle needle seat to blind hole thus there is a first conical region with a small cone angle.
  • a second cone-shaped section with a larger cone angle follows.
  • the blind hole ends in a conical section with a cone angle which is greater than the first and the second cone angle.
  • This configuration of the blind hole with three Various ⁇ nen cone or cone angles the malicious volume of the blind hole can be further reduced.
  • a harmful volume of the volume of the blind hole is referred to at ge ⁇ patentedem injection valve, wherein the volumes of the injection holes are not counted.
  • the Schadvolu ⁇ men is thus the trapped between nozzle needle tip and blind hole wall volume.
  • the inlet openings of the injection holes or the injection hole are arranged between the first conical region and the second conical region. In this way, a sufficient wall thickness of the nozzle body between the nozzle needle seat and the injection hole can be ensured at the transition area.
  • the blind hole has the shape of a partial ellipsoid. This allows, similar to the configuration with three different cone or cone angles, a fla ⁇ che configuration of the blind hole and a sufficient wall ⁇ strength between the nozzle needle seat and injection hole. At an elevation angle of the injection holes with respect to
  • the injection holes extend obliquely through the wall of the nozzle body.
  • the material of the nozzle body is in this case referred to between the blind hole and the outer surface of SI ⁇ sen emotionss as a wall.
  • the oblique course of the Einspritzlö ⁇ cher through this wall causes a large length and thus a large volume of injection holes, which also has an unfavorable effect on emissions.
  • the nozzle body according to the invention on the outer surface of the nozzle ⁇ body in the exit region of the injection holes provided a recess.
  • the wall thickness of the nozzle body is reduced in this area and the length of the injection holes is shortened.
  • the length of the injection holes is shortened to a maximum of 1.2 mm, more preferably less than 1 mm and most preferably less than 0.8 mm.
  • the wall thickness of the nozzle body remains high for sufficient high-pressure resistance.
  • the Ausneh ⁇ mung can for example be designed as an annular groove on the outer surface of the nozzle body ⁇ .
  • a separate, for example, cone-shaped recess may be provided for each injection hole.
  • a small dead volume in the blind hole can be achieved in an arrangement of a nozzle body according to the invention with a nozzle needle movably mounted axially between an open position and a closed position.
  • a Schadvolumen of less than 0.15 mm 3 more preferably less than 0.1 mm 3 be included ⁇ sen.
  • the nozzle needle has preference ⁇ a conical or a frusto-conical tip.
  • Another independent object of the invention is a Kraftstoffin ector with a nozzle body according to the invention described above or with an arrangement of a nozzle body according to the invention and a nozzle needle, as described above.
  • the nozzle needle is driven directly in the Kraftstoffinj ektor by a piezoelectric actuator.
  • FIG. 1 shows a nozzle body according to the invention in accordance with a first embodiment
  • Figure 2 is a detail view of the nozzle body of Figure 1;
  • FIG 3 shows a detailed view of a nozzle body according to the invention according to a second embodiment.
  • the nozzle body 10 according to the invention has a central
  • a nozzle needle ⁇ recess 11 is arranged.
  • the nozzle needle recess 11 At the end of the nozzle needle recess 11 facing the combustion chamber (not shown), the latter has a conical nozzle needle seat 12 with a cone angle of 112 °.
  • a blind hole 13 connects to the nozzle needle seat 12.
  • injection holes 14 extend with an axis 23 to an outer surface 15 of the nozzle body.
  • the outer surface 15 of the nozzle body 10 has conical recesses 24.
  • the nozzle needle 25 is disposed. This has a sheep-shaped portion 26 and a frusto-conical tip 27. Above the truncated cone-shaped tip 27, the nozzle needle 25 forms a sealing seat with the nozzle needle seat 12.
  • the blind hole 13 connects.
  • the blind hole 13 has a first conical region 19 (see FIG. 2) with a first cone angle.
  • a second conical portion 20 is arranged with a second, larger cone angle.
  • the second Cone angle corresponds, for example, to the cone angle of the nozzle needle seat.
  • the blind hole ends in the direction of the combustion chamber with a conical region 21 which has an opening angle which is greater than the cone angles of the first and second conical regions of the blind hole.
  • the blind hole has a blind hole diameter 17.
  • the nozzle needle ⁇ 25 is shown in a lifted-off from the nozzle needle seat state in Figure 2. Starting from the axial position of the transition 16, the blind hole depth 18 is determined.
  • a ring ⁇ shaped circumferential groove 24 is provided, through which the length 28 of the injection holes 14 is shortened.
  • the length 28 is preferably shorter than 1 mm.
  • Figure 3 shows an alternative embodiment of the OF INVENTION ⁇ to the invention the nozzle body.
  • the blind hole in the form of a partial ellipsoid is formed ⁇ .
  • the blind hole 13 at the transition region 16 the blind hole diameter 17.
  • the blind hole 13 extends in a blind hole depth 18 in the axial direction to the combustion chamber.
  • the depth 18 of the blind hole is for example less than 0.4 mm while the diameter 17 is greater than 0.8 mm.

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

L'invention concerne un corps de buse comportant un évidement d'aiguille de buse disposé autour d'un axe longitudinal, qui comprend un siège d'aiguille de buse conique débouchant dans un trou borgne, ainsi qu'au moins un trou d'injection s'étendant du trou borgne vers une surface extérieure du corps de buse. Dans la zone de transition vers le siège d'aiguille de buse conique, le trou borgne présente un diamètre de trou borgne et s'étend dans la direction axiale, de la zone de transition jusqu'à une profondeur de trou borgne, le rapport diamètre de trou borgne sur profondeur de trou borgne étant supérieur ou égal à 1,5. L'invention concerne également un dispositif composé d'un corps de buse et d'une aiguille de buse, ainsi qu'un injecteur de carburant.
PCT/EP2011/062520 2010-07-23 2011-07-21 Corps de buse comportant un trou borgne Ceased WO2012010657A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010032050.1 2010-07-23
DE102010032050.1A DE102010032050B4 (de) 2010-07-23 2010-07-23 Düsenkörper mit Sackloch

Publications (2)

Publication Number Publication Date
WO2012010657A2 true WO2012010657A2 (fr) 2012-01-26
WO2012010657A3 WO2012010657A3 (fr) 2012-06-14

Family

ID=44629149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/062520 Ceased WO2012010657A2 (fr) 2010-07-23 2011-07-21 Corps de buse comportant un trou borgne

Country Status (2)

Country Link
DE (1) DE102010032050B4 (fr)
WO (1) WO2012010657A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113423945A (zh) * 2019-02-12 2021-09-21 利勃海尔零部件德根多夫有限公司 用于燃料喷射器的喷嘴
US11555067B2 (en) 2014-01-15 2023-01-17 Hoffmann-La Roche Inc. Fc-region variants with improved protein A-binding

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012211459A1 (de) * 2012-07-03 2014-01-09 Robert Bosch Gmbh Kraftstoffeinspritzventil mit verbessertem Spritzloch
AT513039B1 (de) * 2012-09-03 2014-01-15 Avl List Gmbh Injektion
DE102012223064A1 (de) * 2012-12-13 2014-06-18 Continental Automotive Gmbh Vario-Düsennadel, Vario-Düsenkörper, Vario-Düsenbaugruppe sowie Vario-Kraftstoffinjektor
EP2905457B1 (fr) * 2014-01-15 2018-08-29 Continental Automotive GmbH Ensemble de soupape et injecteur de fluide pour moteur à combustion
DE102015214306A1 (de) * 2015-07-29 2017-02-02 Continental Automotive Gmbh Verfahren zum Herstellen eines Düsenkörpers für ein Fluideinspritzventil und Fluideinspritzventil

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DE2843000A1 (de) * 1978-10-03 1980-04-24 Bosch Gmbh Robert Kraftstoffeinspritzduese
EP0413173B1 (fr) * 1989-08-17 1993-08-25 STEYR-DAIMLER-PUCH Aktiengesellschaft Injecteur de combustible pour moteurs à combustion interne
JP2819702B2 (ja) * 1989-12-12 1998-11-05 株式会社デンソー 燃料噴射弁
EP0809017A1 (fr) * 1996-05-22 1997-11-26 Steyr-Daimler-Puch Aktiengesellschaft Injecteur de carburant à deux étages pour moteurs à combustion interne
JP2004027955A (ja) * 2002-06-25 2004-01-29 Denso Corp 燃料噴射ノズル
DE10246693A1 (de) * 2002-10-07 2004-04-15 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
DE102004033282A1 (de) * 2004-07-09 2006-02-02 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102006043460A1 (de) * 2006-09-15 2008-03-27 Man Diesel Se Verfahren zur Optimierung einer Einspritzdüse für eine Brennkraftmaschine
JP4610631B2 (ja) * 2008-05-01 2011-01-12 三菱電機株式会社 燃料噴射弁
DE102009018767A1 (de) * 2009-04-24 2010-10-28 Man Diesel & Turbo Se Kraftstoffeinspritzdüse für eine Brennkraftmaschine
EP2369166B1 (fr) * 2010-03-22 2017-12-13 Delphi International Operations Luxembourg S.à r.l. Buse à injection

Non-Patent Citations (1)

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Title
None

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11555067B2 (en) 2014-01-15 2023-01-17 Hoffmann-La Roche Inc. Fc-region variants with improved protein A-binding
CN113423945A (zh) * 2019-02-12 2021-09-21 利勃海尔零部件德根多夫有限公司 用于燃料喷射器的喷嘴
CN113423945B (zh) * 2019-02-12 2024-02-06 利勃海尔零部件德根多夫有限公司 用于燃料喷射器的喷嘴

Also Published As

Publication number Publication date
DE102010032050A1 (de) 2012-01-26
WO2012010657A3 (fr) 2012-06-14
DE102010032050B4 (de) 2017-12-21

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