EP0980474B1 - Kraftstoffeinspritzdüse für selbstzündende brennkraftmaschinen - Google Patents

Kraftstoffeinspritzdüse für selbstzündende brennkraftmaschinen Download PDF

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Publication number
EP0980474B1
EP0980474B1 EP98936237A EP98936237A EP0980474B1 EP 0980474 B1 EP0980474 B1 EP 0980474B1 EP 98936237 A EP98936237 A EP 98936237A EP 98936237 A EP98936237 A EP 98936237A EP 0980474 B1 EP0980474 B1 EP 0980474B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
section
valve stem
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.)
Expired - Lifetime
Application number
EP98936237A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0980474A1 (de
Inventor
Karl Hofmann
Friedrich Boecking
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 EP0980474A1 publication Critical patent/EP0980474A1/de
Application granted granted Critical
Publication of EP0980474B1 publication Critical patent/EP0980474B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M61/16—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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
    • 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
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injector for Self-igniting internal combustion engines with one Nozzle body, in the bottom of which a blind hole conical seat is formed by the Spray openings, and with a valve needle, with a guide section in the entrance area of the Blind hole against a closing force and against the fuel flow direction slidably guided is and the end one at the guide section subsequent valve stem one with the seat cooperating closing cone, the Valve stem on the circumference of an annulus for the Fuel supply limited.
  • Fuel injectors go out of the DE-OS 37 34 587 and from the German utility model 93 01 992.0.
  • An object according to claim 1, first part is from US-A-3368 761 known.
  • German utility model 93 01 992.0 emerging fuel injector is replaced by a Guide sleeve which surrounds the valve shaft and the a conical front and in her the conical end section close to several has conical front-facing recesses, prevents the locking cone from playing or an eccentricity of the valve needle or at the valve needle acting side forces at small Opening stroke or part of the pre-stroke Covering spray holes completely or partially, causing results in an impairment of the combustion process.
  • the invention is therefore based on the object generic fuel injector such to further develop that mentioned above Manufacturing tolerances especially in the area of Pre-strokes do not adversely affect the injection process impact and that at least at the start of spraying slowly increasing injection is reached.
  • a throttle device is provided at the one in the annulus against the restoring force a spring axially displaceable sleeve is arranged, which with a conical front on the outer ring surface of the conical seat. It is particularly advantageous if in the sleeve at least two by axial displacement of the valve needle sequentially controllable openings with different opening cross-section are provided.
  • a sleeve has in particular the very large one Advantage on that they are not just simple is easy to manufacture, but in particular is also to be installed outside the nozzle body.
  • An advantageous embodiment provides that a first opening above one on the valve stem trained control edge in the jacket of the sleeve and a second opening with a smaller opening cross-section than that of the first opening below that on the Valve stem trained control edge are arranged.
  • the one provided in the conical end face Opening takes over an initial throttling, whereas the opening provided in the jacket through Axial displacement of the valve needle one Decrease in throttle cross-section dependent on valve needle stroke allows.
  • the opening provided in the jacket can an elliptical, oval, round, three, four or have a polygonal shape.
  • Another advantageous embodiment provides that in the annulus against the restoring force of a Spring an axially displaceable sleeve is arranged, which with a conical front on the outer ring surface of the conical end face and that the sleeve is opposite in the valve stem at least one cooperating with the sleeve Recess is arranged, the opening cross section at the facing the guide portion of the valve needle End of the sleeve steadily towards the conical seat increases.
  • the sleeve is special simple and with few manufacturing steps produced.
  • FIG. 1 The lower section of a fuel injector for Self-igniting internal combustion engines is shown in FIG. 1 the left half of the picture, but this is only the should illuminate technical background and none Illustrates embodiment of the invention.
  • a valve needle axially slidably arranged with a (not shown) guide section in the entrance area of Blind hole against a closing force and against the fuel flow direction axially displaceable is led and which in the end one to the Guide section adjoining valve stem 10 a closing cone 12 interacting with the seat surface 32 having.
  • the valve stem 10 delimits one on the circumference Annulus 40, which is the supply of fuel serves.
  • a throttle device changeable throttle cross section arranged by which depends on the axial displacement of the Valve needle the injection quantity is variable.
  • the Throttle device includes one in the annulus on the Nozzle body 30 trained shoulder 31 and a the valve stem 10 of the valve needle slightly downstream control edge 20 to which downstream two conical surfaces 21, 22 with connect different cone angles.
  • throttle device changeable throttle cross section The function of such a throttle device changeable throttle cross section is as follows: First becomes a first throttle cross section through the distance between the shoulder 31 and the control edge 20 and thus between the shoulder 31 and the valve stem 10 realized.
  • the throttle cross-section initially changes as long not until the control edge 20 has a Ü in FIG has performed designated lifting movement and Control edge runs over shoulder 31.
  • the first conical surface 21 of the shoulder 31 opposite, which due to its conicity with a further axial displacement of the valve needle to one Decrease in throttle cross section leads.
  • FIG. 3 and Fig. 3a Another fuel injector with a Throttle device with variable Throttle cross section, which in particular in Injection nozzles for common rail injection systems for Application is shown in Fig. 3 and Fig. 3a and is also only intended to provide the technical background show and represents no embodiment of the Invention.
  • Fig. 3 are those elements that with those of 1 and 2 fuel injectors shown are identical, provided with the same reference numerals, so that regarding their description to the Explanations related to these fuel injectors is taken.
  • the common rail fuel injector shown in FIG. 3 differs by the used in common rail nozzles, known per se Valve seat.
  • the one shown in Fig. 3 Fuel injector also differs from those shown in Figs. 1 and 2 Fuel injectors in that the on the Valve needle 10 formed control edge 20 on the Valve body 30 trained shoulder 31 in essentially directly with a distance d1 opposite.
  • the control edge 20 closes a cone surface 23, the cone angle of which is smaller is than the angle ä2 of the closing cone.
  • Fuel injector is as follows: First, the Closing cone 12 slightly from the valve seat 32, whereby there is a gap between the closing cone 20 and forms the valve seat 32, the width of which is smaller than the distance d1 between the control edge 20 and the Shoulder 31. Because of these distance ratios first forms the gap between the closing cone 12 and the valve seat 32 a throttle. Another The gap becomes increasingly axial movement of the valve needle between the shoulder 31 and the control edge 20 on the Valve stem 10 continuously larger, approximately until the control edge 20 adjoining conical surface 23 along the shoulder 31 moved, i.e. until the valve needle 10 has an axial stroke Height h1. This will start with a Flat increase in injection quantity with increasing stroke the valve needle, which after passing through the Axial strokes of size h1 with increasing axial stroke gets bigger.
  • Embodiments of throttle devices for Fuel injectors are shown in FIGS. 4 and 5 as each shown half-sectional view.
  • Embodiments are those elements that with those of those described above Fuel injectors are identical to the same Provide reference numerals so that with respect to their Description on the comments on the above described fuel injection nozzles becomes.
  • the shown in Figs. 4 and 5 Embodiments differ from those in Fig. 1 to 3 shown fuel injectors, that instead of training a shoulder 31 in the Annulus 40 in this one against the restoring force a spring (not shown) axially displaceable Sleeve 50 is arranged with a conical trained end face on the outer ring surface 32a the conical seat 32 rests.
  • valve stem 10 sequentially controllable openings 52, 53 provided, the first opening 52 in the jacket of the Sleeve 50 is arranged and the second opening 53 the conical end face 51, for example is provided in the form of grooves.
  • a control edge 70 is provided, which at closed fuel injector in one predetermined distance Ü below the first opening 52 is arranged with a larger opening cross-section.
  • Such a fuel injector acts in the conical end face 51 provided opening 53 initially as a throttle, which at a slight Axial displacement of the valve stem 10 through the opening cross section of the second opening 53 certain injection quantity leads.
  • Another Axial displacement of the valve stem 10 runs over the Control edge 70 in the jacket of the sleeve 50th arranged opening 52 with a larger opening cross section, whereby the amount of fuel injected with increasing stroke movement of the valve stem 10 is continuously increasing.
  • the one in Fig. 4 on the right half of the picture illustrated embodiment are the two Openings of different cross sections each formed a row of holes 61, 62, the downstream hole row 61 a smaller one Total cross section has as the upstream horizontal row of holes 62.
  • control edge 70 lies between the first and second row of holes 61, 62.
  • Fig. 5 on the left half of the picture Embodiment differs from that in Fig. 4 illustrated embodiment in that the Sleeve 50 opposite in valve stem 10 several recesses cooperating with the sleeve 50 80 are arranged, the opening cross-section on the the cone 12 facing away and one (not shown) guide portion of the valve needle facing end of the sleeve 50 to the conical seat steadily increasing.
  • This area 81 represents one Throttle with variable throttle cross section represents the by a stroke movement of the valve stem 10 is continuously reduced.
  • the illustrated embodiment is the sleeve 50 trained in such a way that Axial displacement of the valve needle and thus the Valve stem 10 can be taken through the valve stem 10 is.
  • the valve stem 10 has a shoulder 17 on which engages a projection 57 of the sleeve 50.
  • the sleeve 50 has a conical shape Recesses 55 that are open toward the end face 51 which represent a throttle cross section, the with increasing axial displacement of the valve stem 10 decreases.
  • the Projection 57 so far from the Valve needle 10 trained shoulder 17 arranged, that the sleeve 50 first with a lifting movement of the Valve needle is not taken. In this case is the amount of fuel injected that in the conical end face 51st formed openings 55, which have a throttle function exercise, led.
  • the distance of the protrusion 57 over the shoulder 17 corresponds to a preliminary stroke of Fuel injector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98936237A 1997-12-11 1998-06-19 Kraftstoffeinspritzdüse für selbstzündende brennkraftmaschinen Expired - Lifetime EP0980474B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19755057 1997-12-11
DE19755057A DE19755057A1 (de) 1997-12-11 1997-12-11 Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
PCT/DE1998/001696 WO1999030028A1 (de) 1997-12-11 1998-06-19 Kraftstoffeinspritzdüse für selbstzündende brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0980474A1 EP0980474A1 (de) 2000-02-23
EP0980474B1 true EP0980474B1 (de) 2003-12-03

Family

ID=7851560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98936237A Expired - Lifetime EP0980474B1 (de) 1997-12-11 1998-06-19 Kraftstoffeinspritzdüse für selbstzündende brennkraftmaschinen

Country Status (5)

Country Link
US (1) US6257506B1 (ja)
EP (1) EP0980474B1 (ja)
JP (1) JP4223077B2 (ja)
DE (2) DE19755057A1 (ja)
WO (1) WO1999030028A1 (ja)

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DE19907356A1 (de) * 1999-02-20 2000-10-12 Bosch Gmbh Robert Düseneinheit zur Dosierung von Flüssigkeiten oder Gasen
DE19942370A1 (de) * 1999-09-04 2001-03-22 Bosch Gmbh Robert Einspritzdüse für Brennkraftmaschinen mit einer Ringnut in der Düsennadel
IT1319988B1 (it) * 2000-03-21 2003-11-12 Fiat Ricerche Spina di chiusura di un ugello in un iniettore di combustibile permotori a combustione interna.
DE10031264A1 (de) * 2000-06-27 2002-01-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10031537B4 (de) * 2000-06-28 2009-06-04 Continental Automotive Gmbh Ausbildung eines Einspritzventils zur Verminderung der Sitzbelastung
DE10061571B4 (de) * 2000-12-11 2007-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10103051B4 (de) * 2001-01-24 2006-07-27 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10105681A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzventil für eine Brennkraftmaschine
JP3879909B2 (ja) * 2001-03-29 2007-02-14 株式会社デンソー 燃料噴射装置
DE10149961A1 (de) * 2001-10-10 2003-04-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE10160490B4 (de) * 2001-12-08 2005-10-06 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung, Kraftstoffsystem sowie Brennkraftmaschine
DE10249144A1 (de) * 2002-10-22 2004-05-06 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004025729A1 (de) * 2004-05-26 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine
CA2473639C (en) * 2004-07-09 2006-11-14 Westport Research Inc. Fuel injection valve
DE102004055873A1 (de) 2004-11-19 2006-05-24 Robert Bosch Gmbh Kraftstoffeinspritzdüse
DE102004060552A1 (de) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine
EP1851427B1 (en) * 2005-02-22 2011-05-11 Continental Automotive Systems US, Inc. Common rail injector with active needle closing device
DE102005030868A1 (de) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventile bei Kraftmaschinen
US7578450B2 (en) * 2005-08-25 2009-08-25 Caterpillar Inc. Fuel injector with grooved check member
US20070200011A1 (en) * 2006-02-28 2007-08-30 Caterpillar Inc. Fuel injector having nozzle member with annular groove
DE102006052817A1 (de) * 2006-11-09 2008-05-15 Robert Bosch Gmbh Brennstoffeinspritzventil
JP4710892B2 (ja) 2007-09-20 2011-06-29 トヨタ自動車株式会社 内燃機関の燃料噴射制御装置
DE102007053888A1 (de) * 2007-11-09 2009-05-14 Volkswagen Ag Verbrennungsmotor mit Selbstzündung und einem optimierten Injektor
JP2009138614A (ja) * 2007-12-05 2009-06-25 Mitsubishi Heavy Ind Ltd 蓄圧式燃料噴射装置の燃料噴射弁
DE102008001425A1 (de) 2008-04-28 2009-10-29 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung
DE102008039920A1 (de) * 2008-08-27 2010-03-04 Continental Automotive Gmbh Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
DE102009028089A1 (de) * 2009-07-29 2011-02-10 Robert Bosch Gmbh Kraftstoffeinspritzventil mit erhöhter Kleinmengenfähigkeit
DE102009029542A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102011003926A1 (de) * 2011-02-10 2012-08-16 Robert Bosch Gmbh Ventil zum Steuern eines Fluids
EP2799706A1 (en) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Injection nozzles
DE102013213460A1 (de) * 2013-07-09 2015-01-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102013219568A1 (de) * 2013-09-27 2015-04-02 Robert Bosch Gmbh Kraftstoffeinspritzventil und ein Verfahren zu dessen Herstellung
GB201408422D0 (en) * 2014-05-13 2014-06-25 Delphi Int Operations Lux Srl Fuel injector
CN104061101A (zh) * 2014-07-14 2014-09-24 北京亚新科天纬油泵油嘴股份有限公司 一种燃料供给系统喷油器及其中的喷油嘴
DE102016200700A1 (de) * 2016-01-20 2017-07-20 Ford Global Technologies, Llc Verfahren zum Betreiben einer direkteinspritzenden Brennkraftmaschine und fremdgezündete Brennkraftmaschine zur Durchführung eines derartigen Verfahrens
DE102016208055A1 (de) * 2016-05-11 2017-11-16 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102016215637A1 (de) * 2016-08-19 2018-02-22 Robert Bosch Gmbh Kraftstoffeinspritzdüse
FR3057623B1 (fr) * 2016-10-14 2020-12-25 Delphi Int Operations Luxembourg Sarl Membre de vanne d'un injecteur de carburant

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US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly

Also Published As

Publication number Publication date
DE59810346D1 (de) 2004-01-15
JP2001511231A (ja) 2001-08-07
EP0980474A1 (de) 2000-02-23
WO1999030028A1 (de) 1999-06-17
JP4223077B2 (ja) 2009-02-12
DE19755057A1 (de) 1999-06-17
US6257506B1 (en) 2001-07-10

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