EP2470771B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2470771B1
EP2470771B1 EP10734739.5A EP10734739A EP2470771B1 EP 2470771 B1 EP2470771 B1 EP 2470771B1 EP 10734739 A EP10734739 A EP 10734739A EP 2470771 B1 EP2470771 B1 EP 2470771B1
Authority
EP
European Patent Office
Prior art keywords
seat
region
nozzle
fuel injection
sealing
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.)
Not-in-force
Application number
EP10734739.5A
Other languages
German (de)
English (en)
Other versions
EP2470771A1 (fr
Inventor
Michael Leukart
Katja Grothe
Wilhelm Christ
Gerhard Suenderhauf
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 EP2470771A1 publication Critical patent/EP2470771A1/fr
Application granted granted Critical
Publication of EP2470771B1 publication Critical patent/EP2470771B1/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
    • 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, 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
    • 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
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188

Definitions

  • the invention relates to a fuel injection valve for injecting fuel into a combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
  • a fuel injection valve for an internal combustion engine which has a valve body in which a fuel-filled under high pressure pressure space is formed, from which emanates at least one injection port.
  • a longitudinally displaceable valve needle is arranged, which cooperates with a sealing surface with a conical valve seat formed in the pressure chamber for opening and closing the at least one injection opening.
  • the valve needle In order for sufficient fuel to flow between the sealing surface of the valve needle and the valve seat to the injection openings in order to achieve a corresponding injection rate, the valve needle must pass through a certain minimum stroke. For only the area must be overcome, in which the gap between the sealing surface and the valve seat throttles and the pressure applied to the injection openings injection pressure is reduced.
  • a conical valve seat is proposed with an opening angle between 75 ° and 100 °.
  • the proposed fuel injection valve the advantage that to overcome the seat throttling area a lesser stroke of the valve needle is required, so that rapid successive injections are possible with a high injection pressure.
  • the larger opening angle of the valve seat should reduce flow-related disturbing forces on the valve needle, which can result in a desalination of the valve needle.
  • a fuel injector having a seat-proximate guide portion for the needle and a blind-hole nozzle.
  • the object of the present invention is therefore to provide a fuel injector which has a high strength, in particular in the region of the valve seat.
  • the proposed to solve the problem fuel injector has a nozzle needle, which is guided in a central bore of a nozzle body for releasing or closing at least one injection port hubbeweglich, wherein the nozzle needle formed on its combustion chamber end end, circumferential sealing area with a combustion chamber end of the Nozzle body trained conical seal seat cooperates.
  • the conical sealing seat has an opening angle ⁇ 1 between 40 ° and 50 °.
  • the nozzle body in the region of the injection openings have a smaller wall thickness, so that the injection openings have a shorter length, which in turn has a favorable effect on the coking sensitivity.
  • a greater strength or robustness of the Dichtsitz Schemees is also achievable by making other strength-increasing measures, such as a higher material quality, greater wall thicknesses or stiffeners, these measures are usually more expensive and usually not without influence on the function of the fuel injector.
  • a "guide fitment” is defined as a “guide fit” which is formed within a region of the central bore whose length amounts to a maximum of 40% of the total length of the nozzle body starting from the combustion chamber end of the nozzle body.
  • the central bore has an area of reduced diameter for the formation of the seat-near guide area.
  • the proposed seat geometry requires a larger Düsennadelhub Wegentdrosselung. Accordingly, find in the proposed fuel injection valve preferably quick-switching valves use. These enable the stroke range above the seat throttle to be reached more quickly so that the full injection pressure is applied to the injection openings in a short time. To increase the speed of the nozzle needle, for example, a large ratio of drain and inlet throttle can be selected. Thus, larger needle strokes are compensated by a "fast" needle. On the other hand, a targeted utilization of the needle throttle area and a reduced needle force for small needle strokes allow smaller and smallest injection quantities to be more accurately metered.
  • the at least one injection opening opens in the region of the sealing seat in the central bore of the nozzle body.
  • the fuel injection valve has a so-called seat hole nozzle.
  • Seat hole nozzles have blind hole nozzles, in which the injection openings open below the sealing seat in a blind hole, among other things, the advantage that the harmful volume can be reduced by up to 50%. Due to the lower harmful emissions, HC emissions are also significantly reduced. Since the requirements with respect to the emission values steadily increase, another object of the present invention can be seen in the reduction of such.
  • the proposed seat geometry of a fuel injection valve according to the invention proves to be particularly advantageous in connection with the training as a seat hole nozzle. Due to the injection openings formed in the seat portion, a seat hole nozzle has a lower strength compared to a blind hole nozzle, but this is compensated by the fact that stresses due to the proposed smaller opening angle of the sealing seat can be significantly reduced.
  • the seat-near guide area is formed immediately adjacent to the sealing seat.
  • an optimal guidance of the nozzle needle can be achieved on the other hand, the production of the guide area within the central bore is simplified.
  • the central bore has a reduced diameter for forming the guide region, so that only on one side of the guide region, that is on the seat remote side, a region of the central bore with a larger diameter connects, so that it can be easily prepared by exposure ,
  • the peripheral sealing area formed on the nozzle needle has at least one cone-shaped partial area.
  • the cone angle ⁇ 2 of this partial area is preferably selected to be at least slightly larger than the opening angle ⁇ 1 of the sealing seat.
  • the nozzle needle thus essentially abuts with a line-shaped sealing contour on the sealing seat.
  • To form a sealing edge of the circumferential sealing area be composed of two cone-shaped portions with different cone angles.
  • the circumferential sealing area formed on the nozzle needle has a pressure stage with hydraulic active surfaces which can be acted on with fuel pressure in the axial and / or radial direction.
  • a pressure stage may for example also have the shape of a circumferential groove.
  • An adjoining, in the radial direction effective hydraulic pressure can also contribute to the leadership of the nozzle needle and thus prevent the risk of Ausachstechnik.
  • a fuel injection valve according to the invention is particularly suitable for modern combustion processes with a high proportion of premixed combustion in the partial load range, which generate significantly increased HC emissions.
  • the commonly chosen nozzle designs add to the increased levels. Because the injection nozzle is usually designed as a blind hole nozzle with a seat angle of about 60 °.
  • the presently proposed nozzle design can significantly reduce the HC emissions, to ensure good spray symmetry and to achieve a strength of the nozzle area, which allows high injection pressures.
  • ballistic fuel injection valves without stroke stop are widely used.
  • a fuel injection valve according to the invention can also be designed in this way.
  • Fig. 1 The juxtaposition of Fig. 1 is on the left side according to the invention and to remove a known nozzle construction on the right side.
  • Both nozzle designs comprise a nozzle needle 1, which in a central bore 2 of a Nozzle body 3 is guided in a liftable manner.
  • the nozzle construction according to the invention has a seat-near guide region 7 with a reduced diameter.
  • At least one injection port 4 is released or closed.
  • Both nozzles are constructed as seat hole nozzles, that is to say that the at least one injection opening 4 open into the central bore 2 in the region of a sealing seat 6 formed within the central bore 2 in each case.
  • the sealing seat 6 in each case has a conical shape, which essentially corresponds to a conically extending partial region 8 of the nozzle needle 1 and forms a sealing region 5.
  • a cylindrical portion and thereafter joins again a conical portion, so that at the nozzle needle 1, a pressure stage 9 and between the nozzle needle 1 and sealing seat 6, an annular space is formed as a pressure chamber, which in the operation of the injection valve with is filled under high pressure fuel.
  • the pressure chamber is in communication with a formed between the nozzle needle 1 and the central bore 2 annular gap, which also serves as a pressure chamber.
  • Combustion chamber side in the Fig. 1 below, the central bore 2 in each case runs out into a blind hole 10.
  • Fig. 2 shows a seat hole nozzle (left side) and a blind hole nozzle (right side) in a juxtaposition.
  • the at least one injection opening 4 opens in the region of the sealing seat 6 into the central bore 2 of the nozzle body, while in the blind-hole nozzle the at least one injection opening 4 opens into the blind hole 10.
  • a dead volume in the blind hole 10. As the illustrations of Fig. 2 it can be seen, however, this is significantly, that is reduced by about 50%. The HC emissions can therefore also be significantly reduced when using a seat hole nozzle, which represents a further advantage.

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 (4)

  1. Soupape d'injection de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant une aiguille de buse (1) qui est guidée de manière déplaçable en va-et-vient dans un alésage central (2) d'un corps de buse (3) pour ouvrir ou fermer au moins une ouverture d'injection (4), l'aiguille de buse (1) coopérant, par le biais d'une région d'étanchéité (5) périphérique réalisée sur son extrémité du côté de la chambre de combustion, avec un siège d'étanchéité (6) s'étendant sous forme conique, réalisé à l'extrémité du côté de la chambre de combustion du corps de buse (3), caractérisée en ce que le siège d'étanchéité (6) s'étendant sous forme conique possède un angle d'ouverture (α1) compris entre 40° et 50°, l'au moins une ouverture d'injection (4) dans la région du siège d'étanchéité (6) débouche dans l'alésage central (2) et l'alésage central (2) présente une région de guidage (7) proche du siège avec un diamètre réduit pour guider l'aiguille de buse (1), la région de guidage (7) étant réalisée dans une région de l'alésage central (2) dont la longueur vaut au maximum 40% de la longueur totale du corps de buse (3) à partir de l'extrémité du côté de la chambre de combustion du corps de buse (3).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que la région de guidage (7) proche du siège est réalisée de manière à se raccorder directement au siège d'étanchéité (6).
  3. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'étanchéité (5) périphérique réalisée sur l'aiguille de buse (1) possède au moins une région partielle (8) de forme conique, de préférence l'angle de conicité (α2) de la région partielle (8) étant choisi de manière à être au moins légèrement plus grand que l'angle d'ouverture (α1) du siège d'étanchéité (6).
  4. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'étanchéité (5) périphérique réalisée sur l'aiguille de buse (1) possède un étage de pression (9) avec des surfaces actives hydrauliques, qui peuvent être sollicitées dans la direction axiale et/ou radiale par une pression de carburant.
EP10734739.5A 2009-08-28 2010-07-19 Injecteur de carburant Not-in-force EP2470771B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009028960 2009-08-28
DE102009029542A DE102009029542A1 (de) 2009-08-28 2009-09-17 Kraftstoffeinspritzventil
PCT/EP2010/060415 WO2011023467A1 (fr) 2009-08-28 2010-07-19 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2470771A1 EP2470771A1 (fr) 2012-07-04
EP2470771B1 true EP2470771B1 (fr) 2013-09-11

Family

ID=43524865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10734739.5A Not-in-force EP2470771B1 (fr) 2009-08-28 2010-07-19 Injecteur de carburant

Country Status (6)

Country Link
US (1) US9441590B2 (fr)
EP (1) EP2470771B1 (fr)
CN (1) CN102625878B (fr)
DE (1) DE102009029542A1 (fr)
RU (1) RU2541367C2 (fr)
WO (1) WO2011023467A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104088741A (zh) * 2014-06-23 2014-10-08 中国北方发动机研究所(天津) 一种喷油器针阀体盛油腔结构

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013138673A1 (fr) * 2012-03-14 2013-09-19 International Engine Intellectual Property Company, Llc Gicleur
FR3057623B1 (fr) * 2016-10-14 2020-12-25 Delphi Int Operations Luxembourg Sarl Membre de vanne d'un injecteur de carburant
DE102018113508A1 (de) * 2018-06-06 2019-12-12 Liebherr-Components Deggendorf Gmbh Verfahren zum Fertigen einer Düse
RU190852U1 (ru) * 2019-03-29 2019-07-15 Евгений Викторович Горбачевский Распылитель форсунки дизеля
RU190851U1 (ru) * 2019-03-29 2019-07-15 Евгений Викторович Горбачевский Распылитель электрогидравлической форсунки
RU2698586C1 (ru) * 2019-05-13 2019-08-28 Общество с ограниченной ответственностью Управляющая компания "Алтайский завод прецизионных изделий" Распылитель топливной форсунки

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104088741A (zh) * 2014-06-23 2014-10-08 中国北方发动机研究所(天津) 一种喷油器针阀体盛油腔结构

Also Published As

Publication number Publication date
RU2541367C2 (ru) 2015-02-10
EP2470771A1 (fr) 2012-07-04
RU2012111981A (ru) 2013-10-20
DE102009029542A1 (de) 2011-03-03
US20120153053A1 (en) 2012-06-21
CN102625878A (zh) 2012-08-01
CN102625878B (zh) 2016-03-09
US9441590B2 (en) 2016-09-13
WO2011023467A1 (fr) 2011-03-03

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