EP3500749A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP3500749A1
EP3500749A1 EP17754318.8A EP17754318A EP3500749A1 EP 3500749 A1 EP3500749 A1 EP 3500749A1 EP 17754318 A EP17754318 A EP 17754318A EP 3500749 A1 EP3500749 A1 EP 3500749A1
Authority
EP
European Patent Office
Prior art keywords
blind hole
shoulder
fuel
fuel injection
nozzle
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.)
Granted
Application number
EP17754318.8A
Other languages
German (de)
English (en)
Other versions
EP3500749B1 (fr
Inventor
Birgit LENZ
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 EP3500749A1 publication Critical patent/EP3500749A1/fr
Application granted granted Critical
Publication of EP3500749B1 publication Critical patent/EP3500749B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M61/04—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
    • F02M61/16—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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • 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
    • F02M61/1853—Orifice plates
    • 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
    • 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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement

Definitions

  • the invention relates to a fuel injector, as it is preferably used for fuel injection and thus for use in an internal combustion engine.
  • the fuel is introduced under high pressure directly into the combustion chambers of the internal combustion engine.
  • the high pressure serves to finely atomize the fuel and thus to achieve an optimum mixing ratio between the fuel and the oxygen in the combustion chamber, which is essential for a low-emission and effective combustion.
  • fuel injection valves use, as they are known from the prior art, for example from DE 10 2004 050 048 AI.
  • Such a fuel injection valve has a nozzle body, in which a pressure space can be filled with fuel under high pressure and in which a nozzle needle is arranged longitudinally displaceable, which cooperates with a body seat for opening and closing one or more injection openings.
  • a so-called blind hole is often present at the combustion chamber end of the nozzle body, which adjoins the body seat and emanating from the injection openings.
  • the blind hole serves to evenly distribute the fuel to the individual injection openings and thus to achieve a correspondingly uniform distribution of the fuel in the combustion chamber.
  • the pending in the pressure chamber fuel which is under high pressure, flows during the injection between the sealing surface of the nozzle needle and the body seat in the blind hole, from where the fuel in the Injection openings flows and is finally atomized through them into the combustion chamber.
  • Gap between the sealing surface of the nozzle needle and the body seat through into the blind hole which leads to a turbulence of the fuel in the blind hole. This improves the atomization when the turbulence is not so strong that the fuel is distributed unevenly on the spray holes.
  • the gap between the nozzle needle and the body seat becomes larger, so that the fuel in the blind hole is less swirled and thus the atomization tendency of the fuel when passing through the injection openings.
  • the fuel injector according to the invention with the features of claim 1 has the advantage over that the inflow of the fuel to the spray holes in the blind hole area is improved by a sufficient amount of turbulence is introduced into the spray hole and a partial stroke of the nozzle needle in the spray hole and thus the jet break-up Outflow of fuel from the spray holes is intensified in the combustion chamber.
  • the blind hole adjoins directly to the body seat and there forms a cylindrical portion, so that an inlet edge is formed at the transition between the body seat and the blind hole.
  • at least one injection opening which opens into the blind hole, is formed in the nozzle body.
  • the cylindrical portion of the blind hole is at its end facing away from the inlet edge in a diameter reduction, so that at this point a paragraph is formed, wherein the at least one injection port between the shoulder and the inlet edge opens into the blind hole, ie in the region of the cylindrical portion.
  • the fuel flow is guided at the inlet into the blind hole on this paragraph and thereby swirled, which causes corresponding turbulence in the flow, which leads to an intensification of the jet breakup on the passage of the fuel through the injection port, that is, the fuel as it exits the spray hole breaks up very quickly and forms a fine mist of fuel droplets that burn effectively and cleanly with the existing oxygen in the combustion chamber.
  • the shoulder is followed by a substantially hemispherical blind hole bottom. This promotes the flow of fuel over the heel away, so that the desired additional turbulence is intensified by the paragraph.
  • the paragraph is annular disc-shaped, which can be produced in a simple manner.
  • the thus formed relatively sharp edges leads to a significant turbulence of Kraftastoffs in the blind hole.
  • the paragraph is conical, which avoids sharp edges at the transition, but increases the mechanical stability.
  • the transitions from the cylindrical portion of the blind hole to the edge and from the edge to the blind hole bottom may be rounded, in particular in order to reduce notch stresses.
  • the shoulder over the entire circumference of the blind hole is formed with the same depth, so that the flow is symmetrized within the blind hole and thus a supply of all injection openings is ensured, if several of them are distributed over the circumference.
  • the depth of the shoulder is preferably 5 ⁇ m to 100 ⁇ m so that, on the one hand, the desired additional turbulence within the blind hole is achieved and, on the other hand, the volume of the blind hole is not excessively increased.
  • a plurality of injection openings are formed in the nozzle body, which open into the blind hole between the shoulder and the transition edge and which are advantageously distributed uniformly over the circumference. The more injection ports are present, the more uniform the fuel can be distributed in the combustion chamber and the better is usually the combustion.
  • At least one further injection opening is present, which opens into the conical body seat.
  • Figure 1 shows a longitudinal section through a fuel injector, as shown in the
  • FIG. 2 shows a first exemplary embodiment of a fuel injection nozzle according to the invention
  • FIG. 3 shows a further illustration of the fuel injection nozzle according to FIG. 2,
  • FIG 4 shows the same fuel injector as in Figure 3, the course of the
  • Fuel flow is illustrated within the blind hole, and Figure 5 and
  • a prior art fuel injector is shown in longitudinal section, showing only the essential parts of the fuel injector.
  • the fuel injection nozzle has a nozzle body 1 in which a pressure space 2 which can be filled with fuel under high pressure is formed.
  • the compressed fuel is provided for example in a so-called common rail available, a high-pressure fuel storage, which is fed for example by a high-pressure fuel pump.
  • a piston-shaped nozzle needle 4 is arranged longitudinally displaceable, which has at its combustion chamber side end a sealing surface 5 which is conical and with which the nozzle needle 4 cooperates with a likewise conical body seat 7 for opening and closing a flow cross-section.
  • the conical body seat 7 is followed by a blind hole 10, which has a cylindrical portion 12 and a blind hole bottom 13, wherein the blind hole bottom 13 is formed substantially hemispherical.
  • a blind hole 10 From the blind hole 10 is an injection port 14, wherein a plurality of injection ports may be provided through which the fuel can escape and enter the combustion chamber of an internal combustion engine.
  • the nozzle needle 4 is moved by a suitable mechanism in the longitudinal direction, so that it lifts off the body seat 7 and a flow cross-section between the sealing surface 5 and the body seat 7 releases so that fuel under high pressure from the pressure chamber 2 in the Blind hole 10 flows. From there, the fuel continues to flow through one or more injection openings 14 and thus enters the combustion chamber. The fuel is atomized on exiting the injection openings 14, that is, the jet breaks up and forms many small fuel droplets, which mix well with the oxygen in the combustion chamber and thus become an ignitable mixture. To complete the injection, the nozzle needle 4 is back in pressed their closed position in contact with the body seat 7, so that the inflow of fuel into the blind hole 10 is terminated.
  • FIG. 2 Shown in FIG. 2 in a first exemplary embodiment of a fuel injection nozzle according to the invention, which differs from the fuel injection nozzle shown in FIG. 1 by a shoulder 16 within the blind hole 10.
  • the blind hole 10 has a cylindrical portion 12 which connects directly to the body seat 7.
  • the cylindrical portion 12 is bounded by a shoulder 16, which is caused by a reduction in diameter by a depth T, wherein the shoulder 16 is conical in this embodiment.
  • the depth T is 5 to 100 ⁇ (0.005 to 0.1 mm), so that the blind hole 10 compared to the known embodiment, as shown in Figure 1, only a slightly larger volume.
  • the injection openings 14 always open into the cylindrical portion 12 of the blind hole 10, ie between the shoulder 16 and the inlet edge 11. This ensures a uniform distribution of the fuel to all injection openings 14, since all the injection openings 14 have the same inlet characteristic.
  • paragraph 16 is illustrated in Figure 4, where again the same fuel injector as shown in Figure 3.
  • the fuel flows at the opening position of the nozzle needle 4 between the sealing surface 5 and the body seat 7 into the blind hole 10. Since the nozzle needle 4 is relatively far away from the body seat 7 at a late time of the opening stroke, the fuel flows into the blind hole 10 without much turbulence From there, the fuel flows laterally back and flows over the paragraph 16.
  • This overflow of the paragraph 16 leads to a turbulence of the fuel before it enters the same in the injection hole 14, what goes through the Spray hole 14 continues and finally leads to the emergence of the fuel from the injection hole 14 to a better atomization.
  • FIG. 5 shows a further exemplary embodiment of the fuel injection nozzle according to the invention.
  • This differs from the fuel injection nozzle shown in Figure 3 and Figure 4 by a rounded transition between the cylindrical portion of the blind hole 12 and the shoulder 16 and the shoulder 16 to the blind hole bottom 13.
  • the paragraph 16 is formed as an annular disc, that is, it has a rectangular transition between the cylindrical portion 12 of the blind hole 10 and the shoulder 16.
  • injection openings 15 are a characteristic of so-called seat hole nozzles and have a different jet characteristic compared to the injection openings 14, which start from the blind hole 10.
  • the fuel can thus be distributed effectively in the entire combustion chamber volume.

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 injecteur de carburant destiné à être utilisé dans un moteur à combustion interne, l'injecteur comprenant un corps (1) dans lequel une chambre de pression (2) pouvant être remplie de carburant haute pression est formée et dans lequel une aiguille d'injection (4) mobile en longueur est agencée. L'aiguille d'injection (4) présente une surface d'étanchéité (5) au moyen de laquelle elle coopère avec un siège (7) conique de corps formé dans le corps (1) de l'injecteur, et ouvre et ferme ainsi la liaison allant de la chambre de pression (2) à un trou borgne (10). Le trou borgne (10) forme dans le prolongement direct du siège (7) de corps une section cylindrique (12), de sorte qu'un bord d'entrée (11) soit formé à la transition entre le siège (7) de corps et le trou borgne (10). Au moins un orifice d'injection (14), qui débouche dans le trou borgne (10), est ménagé dans le corps (1) d'injection. La section cylindrique du trou borgne (10) présente une réduction de diamètre, de sorte qu'une partie en retrait (16) est formée dans le trou borgne (10), l'orifice ou les orifices d'injection (14) débouchant dans le trou borgne (10) entre la partie en retrait (16) et le bord d'entrée (11).
EP17754318.8A 2016-08-19 2017-08-10 Injecteur de carburant Active EP3500749B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016215637.3A DE102016215637A1 (de) 2016-08-19 2016-08-19 Kraftstoffeinspritzdüse
PCT/EP2017/070285 WO2018033460A1 (fr) 2016-08-19 2017-08-10 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3500749A1 true EP3500749A1 (fr) 2019-06-26
EP3500749B1 EP3500749B1 (fr) 2020-05-27

Family

ID=59656050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17754318.8A Active EP3500749B1 (fr) 2016-08-19 2017-08-10 Injecteur de carburant

Country Status (7)

Country Link
US (1) US11041471B2 (fr)
EP (1) EP3500749B1 (fr)
KR (1) KR102310574B1 (fr)
CN (1) CN109642534B (fr)
DE (1) DE102016215637A1 (fr)
RU (1) RU2734502C2 (fr)
WO (1) WO2018033460A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113339173A (zh) * 2021-06-18 2021-09-03 中国北方发动机研究所(天津) 一种高压共轨喷油器及其喷嘴

Family Cites Families (24)

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SU985386A1 (ru) 1981-08-17 1982-12-30 Центральный Научно-Исследовательский И Конструкторский Институт Топливной Аппаратуры Автотракторных И Стационарных Двигателей Распылитель форсунки дл дизел
DE3300867A1 (de) 1983-01-13 1984-07-19 Mannesmann AG, 4000 Düsseldorf Verfahren zur erzeugung von stahl durch einschmelzen von eisenschwamm im lichtbogenofen
GB2229495A (en) * 1989-03-22 1990-09-26 Lucas Ind Plc Fuel injector
US5037031A (en) * 1990-04-25 1991-08-06 Cummins Engine Company, Inc. Reduced trapped volume
DE59306670D1 (de) * 1993-02-17 1997-07-10 New Sulzer Diesel Ag Brennstoffeinspritzventil für eine Hubkolbenbrennkraftmaschine
CN1169507A (zh) * 1996-06-21 1998-01-07 株式会社杰克赛尔 喷油器
DE19755057A1 (de) * 1997-12-11 1999-06-17 Bosch Gmbh Robert Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
DE19843616B4 (de) * 1998-09-23 2006-07-06 Siemens Ag Kraftstoffeinspritzdüse
DE19931890A1 (de) * 1999-07-08 2001-01-18 Siemens Ag Düsenkörper für eine Kraftstoffeinspritzdüse mit optimierter Spritzlochkanalgeometrie
DE10000574A1 (de) * 2000-01-10 2001-07-19 Bosch Gmbh Robert Kraftstoff-Einspritzdüse
DE10163908A1 (de) * 2001-12-22 2003-07-03 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
RU2232287C2 (ru) 2002-04-16 2004-07-10 Барышников Виктор Сергеевич Форсунка двигателя внутреннего сгорания
DE10245573A1 (de) * 2002-09-27 2004-04-08 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10315821A1 (de) * 2002-11-11 2004-05-27 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
US6908049B2 (en) 2003-11-14 2005-06-21 Alfred J. Buescher Diesel injection nozzle
DE102004002286A1 (de) 2004-01-16 2005-08-11 Man B & W Diesel Ag Kraftstoffeinspritzdüse
DE102004024534A1 (de) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Brennstoffeinspritzventil
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US20130048758A1 (en) * 2010-05-12 2013-02-28 Toyota Jidosha Kabushiki Kaisha Fuel injection valve
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US9470197B2 (en) * 2012-12-21 2016-10-18 Caterpillar Inc. Fuel injector having turbulence-reducing sac

Also Published As

Publication number Publication date
CN109642534B (zh) 2021-11-05
DE102016215637A1 (de) 2018-02-22
KR102310574B1 (ko) 2021-10-08
US11041471B2 (en) 2021-06-22
RU2019107137A (ru) 2020-09-21
RU2019107137A3 (fr) 2020-09-21
RU2734502C2 (ru) 2020-10-19
KR20190039277A (ko) 2019-04-10
US20200378350A1 (en) 2020-12-03
EP3500749B1 (fr) 2020-05-27
CN109642534A (zh) 2019-04-16
WO2018033460A1 (fr) 2018-02-22

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