EP3500749B1 - Kraftstoffeinspritzdüse - Google Patents

Kraftstoffeinspritzdüse Download PDF

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Publication number
EP3500749B1
EP3500749B1 EP17754318.8A EP17754318A EP3500749B1 EP 3500749 B1 EP3500749 B1 EP 3500749B1 EP 17754318 A EP17754318 A EP 17754318A EP 3500749 B1 EP3500749 B1 EP 3500749B1
Authority
EP
European Patent Office
Prior art keywords
shoulder
fuel
blind bore
fuel injection
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.)
Active
Application number
EP17754318.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3500749A1 (de
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/de
Application granted granted Critical
Publication of EP3500749B1 publication Critical patent/EP3500749B1/de
Active 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
    • F02M61/16—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 injection nozzle, as is preferably used for fuel injection and thus for use in an internal combustion engine.
  • fuel injection valves are used, such as those from the prior art, for example from DE 10 2004 050 048 A1 and GB2229495A are known.
  • a fuel injection valve has a nozzle body in which a pressure chamber which can be filled with fuel under high pressure is formed and in which a nozzle needle is arranged to be longitudinally displaceable and which cooperates with a body seat for opening and closing one or more injection openings.
  • blind hole at the combustion chamber end of the nozzle body, which adjoins the body seat and from which the injection openings originate.
  • the blind hole serves to distribute the fuel evenly over the individual injection openings and thus to achieve a correspondingly uniform distribution of the fuel in the combustion chamber.
  • the fuel in the pressure chamber which is under high pressure, flows during the injection between the sealing surface of the nozzle needle and the body seat into the blind hole, from where the fuel flows into the Injection orifices flows and is finally atomized through them into the combustion chamber.
  • the fuel flows through a very narrow gap between the sealing surface of the nozzle needle and the body seat into the blind hole, which leads to swirling of the fuel in the blind hole.
  • This improves atomization if the swirl is not so strong that the fuel is distributed unevenly over the spray holes.
  • the gap between the nozzle needle and the body seat increases, so that the fuel in the blind hole is less swirled and thus the tendency to atomize the fuel when it passes through the injection openings.
  • the fuel injection nozzle according to the invention with the features of patent claim 1 has the advantage that the inflow of fuel to the spray holes in the blind hole area is improved by introducing sufficient turbulence into the spray hole even with a partial stroke of the nozzle needle and thus the jet burst upon exit of the nozzle Fuel from the spray holes in the combustion chamber is intensified.
  • the fuel injection nozzle has a nozzle body in which a pressure chamber which can be filled with fuel under high pressure is formed and in which a longitudinally displaceable nozzle needle is arranged, the nozzle needle having a sealing surface with which it interacts with a conical body seat formed in the nozzle body and thereby Connection from the pressure chamber to a blind hole opens and closes.
  • the blind hole directly adjoins the body seat and forms a cylindrical section there, so that an inlet edge is formed at the transition between the body seat and the blind hole.
  • at least one injection opening is formed in the nozzle body, which opens into the blind hole.
  • the cylindrical section of the blind hole changes into a diameter reduction, so that a shoulder is formed at this point, the at least one injection opening between the shoulder and the leading edge opens into the blind hole, that is, in the region of the cylindrical section.
  • the shoulder in the blind hole guides the fuel flow as it enters the blind hole via this shoulder and thereby swirls it, which causes corresponding turbulence in the flow which, when the fuel passes through the injection opening, leads to an intensification of the jet burst, that is to say the fuel breaks out very quickly when it emerges from the spray hole and forms a fine mist of fuel droplets that burn effectively and cleanly with the oxygen present in the combustion chamber.
  • the shoulder is followed by an essentially hemispherical blind hole base. This promotes the flow of fuel across the heel, so that the desired additional turbulence is intensified by the heel.
  • the shoulder is in the form of an annular disk, which can be produced in a simple manner.
  • the relatively sharp edges thus formed lead to a significant swirling of the fuel in the blind hole.
  • the shoulder is conical, which avoids sharp edges at the transition, but increases the mechanical stability.
  • the transitions from the cylindrical section of the blind hole to the edge and from the edge to the blind hole base can be rounded, in particular in order to reduce notch stresses.
  • the shoulder is formed with the same depth over the entire circumference of the blind hole, so that the flow within the blind hole is symmetrized 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 unduly 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 openings there are, the more evenly the fuel can be distributed in the combustion chamber and the better the combustion as a rule.
  • a fuel injection nozzle according to the prior art is shown in longitudinal section, only the essential parts of the fuel injection nozzle being shown.
  • the fuel injection nozzle has a nozzle body 1, in which a pressure chamber 2 can be filled with fuel under high pressure.
  • the compressed fuel is made available, for example, in a so-called common rail, a high-pressure fuel reservoir that is fed, for example, by a high-pressure fuel pump.
  • a piston-shaped nozzle needle 4 is arranged so as to be longitudinally displaceable, which has a sealing surface 5 at its combustion chamber end, which is conical and with which the nozzle needle 4 interacts with a likewise conical body seat 7 for opening and closing a flow cross section.
  • a blind hole 10 adjoins the conical body seat 7, which has a cylindrical section 12 and a blind hole base 13, the blind hole base 13 being essentially hemispherical.
  • An injection opening 14 extends from the blind hole 10, it also being possible to provide a plurality of injection openings through which the fuel can escape and enter the combustion chamber of an internal combustion engine.
  • the nozzle needle 4 is moved in the longitudinal direction by a suitable mechanism, so that it lifts off the body seat 7 and releases a flow cross section between the sealing surface 5 and the body seat 7, so that fuel under high pressure from the pressure chamber 2 into the Blind hole 10 flows. From there, the fuel continues to flow through one or more injection openings 14 and thus reaches the combustion chamber. The fuel is atomized when it emerges from the injection openings 14, that is to say 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 end the injection, the nozzle needle 4 is returned to pressed their closed position in abutment against the body seat 7, so that the inflow of fuel into the blind hole 10 is stopped.
  • FIG 2 shown in a first embodiment of a fuel injector according to the invention, which differs from that in Figure 1
  • Fuel injector shown differs by a paragraph 16 within the blind hole 10.
  • FIG 3 the right side of this fuel injector is shown enlarged again.
  • the blind hole 10 has a cylindrical section 12 which directly adjoins the body seat 7.
  • the cylindrical section 12 is delimited by a shoulder 16, which is caused by a diameter reduction by a depth T, the shoulder 16 being conical in this exemplary embodiment.
  • the depth T is 5 to 100 microns (0.005 to 0.1 mm), so that the blind hole 10 compared to the known embodiment, as in Figure 1 shown, has only a slightly larger volume.
  • the injection openings 14 always open into the cylindrical section 12 of the blind hole 10, that is to say between the shoulder 16 and the inlet edge 11. This ensures a uniform distribution of the fuel over all injection openings 14, since all injection openings 14 have the same inlet characteristic.
  • FIG. 4 shows where the same fuel injector as in Figure 3 is shown.
  • the fuel flows into the blind hole 10 between the sealing surface 5 and the body seat 7. Since the nozzle needle 4 is relatively far away from the body seat 7 at a late point in time of the opening stroke movement, the fuel flows into the blind hole 10 without large swirls , follows the sealing surface 5 and thus reaches the blind hole base 13 without major turbulence. From there, the fuel flows back laterally and overflows the section 16. This overflow of the section 16 leads to a swirling of the fuel before it enters the spray hole 14 what is through that Spray hole 14 continues and finally leads to better atomization when the fuel exits the spray hole 14.
  • FIG 5 Another embodiment of the fuel injector according to the invention is shown. This differs from that in Figure 3 respectively.
  • Figure 4 Fuel injector shown by a rounded transition between the cylindrical portion of the blind hole 12 and the paragraph 16 or from the paragraph 16 to the blind hole bottom 13. The rounding can minimize notch stresses that would occur with a sharp-edged course, but the effect is related to the turbulence introduced is less.
  • the shoulder 16 is designed as an annular disk, that is to say it has a right-angled transition between the cylindrical section 12 of the blind hole 10 and the shoulder 16. On the one hand, this promotes the introduction of turbulence, on the other hand, notch stresses occur at the sharp-edged transition, which can impair the strength of the nozzle body, in particular at very high injection pressures.
  • injection opening 15 is formed, which extends directly from the body seat 7.
  • Such injection openings 15 are characteristic of so-called seat hole nozzles and have a different jet characteristic compared to the injection openings 14 which emanate from the blind hole 10.
  • the fuel can be effectively distributed over 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)
EP17754318.8A 2016-08-19 2017-08-10 Kraftstoffeinspritzdüse Active EP3500749B1 (de)

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 (de) 2016-08-19 2017-08-10 Kraftstoffeinspritzdüse

Publications (2)

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

Family

ID=59656050

Family Applications (1)

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

Country Status (7)

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

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
EP0611885B1 (de) 1993-02-17 1997-06-04 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
DE102004050048A1 (de) 2004-10-14 2006-04-27 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102006033878A1 (de) * 2006-07-21 2008-01-31 Siemens Ag Düsenbaugruppe für ein Einspritzventil und Einspritzventil
EP2071178A1 (en) * 2007-12-10 2009-06-17 Delphi Technologies, Inc. Injection nozzle
DE102008039920A1 (de) 2008-08-27 2010-03-04 Continental Automotive Gmbh Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
JP5648684B2 (ja) * 2010-05-12 2015-01-07 トヨタ自動車株式会社 燃料噴射弁
CH704964A1 (de) 2011-05-16 2012-11-30 Liebherr Machines Bulle Sa Düse.
US9470197B2 (en) * 2012-12-21 2016-10-18 Caterpillar Inc. Fuel injector having turbulence-reducing sac

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Also Published As

Publication number Publication date
DE102016215637A1 (de) 2018-02-22
US11041471B2 (en) 2021-06-22
CN109642534A (zh) 2019-04-16
US20200378350A1 (en) 2020-12-03
RU2734502C2 (ru) 2020-10-19
EP3500749A1 (de) 2019-06-26
RU2019107137A (ru) 2020-09-21
CN109642534B (zh) 2021-11-05
KR102310574B1 (ko) 2021-10-08
RU2019107137A3 (ru) 2020-09-21
WO2018033460A1 (de) 2018-02-22
KR20190039277A (ko) 2019-04-10

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