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EP0988449A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant

Info

Publication number
EP0988449A1
EP0988449A1 EP99914552A EP99914552A EP0988449A1 EP 0988449 A1 EP0988449 A1 EP 0988449A1 EP 99914552 A EP99914552 A EP 99914552A EP 99914552 A EP99914552 A EP 99914552A EP 0988449 A1 EP0988449 A1 EP 0988449A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
fuel injection
injection device
bore
bores
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
EP99914552A
Other languages
German (de)
English (en)
Other versions
EP0988449B1 (fr
Inventor
Johannes Flarup
Henrik Bjerregaard
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.)
MAN B&W Diesel GmbH
MAN B&W Diesel AS
Original Assignee
MAN B&W Diesel GmbH
MAN B&W Diesel AS
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 MAN B&W Diesel GmbH, MAN B&W Diesel AS filed Critical MAN B&W Diesel GmbH
Publication of EP0988449A1 publication Critical patent/EP0988449A1/fr
Application granted granted Critical
Publication of EP0988449B1 publication Critical patent/EP0988449B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines

Definitions

  • the invention relates to a fuel injection device for internal combustion engines, in particular two-stroke large diesel engines, with a nozzle head which projects into an assigned combustion chamber and is arranged eccentrically to the axis of the combustion chamber and which has a blind borehole which can be acted upon by fuel and from which a plurality of nozzle boreholes depart, which are arranged by means of a slide element arranged in the blind borehole.
  • a fuel injection device of this type is known from EP 0 606 371 B1.
  • the fuel injection devices In large two-stroke diesel engines with a central exhaust valve provided in the cylinder head, the fuel injection devices generally have to be arranged in the region of the periphery of the combustion chamber.
  • the nozzle bores of the nozzle head are arranged in such a way that there is a main injection direction going off to one side of the nozzle head.
  • the nozzle bores In order to avoid a large lateral scattering of the injection jet, the nozzle bores are not arranged radially with respect to the axis of the blind bore, but have a course that faces the main injection direction. This leads to different lengths of the nozzle bores among one another and to different bore lengths over the circumference of individual bores. At the same time there are very different contact angles in the area of the inner ends of the nozzle bores.
  • this object is achieved in that at least some of the nozzle bores are assigned entrance chambers which extend from the blind bore, the inside width of which is larger than the diameter of the nozzle bores and which are designed in such a way that all nozzle bores in the row of bores are at least aligned with one another
  • an input chamber can be expediently assigned to the outer nozzle bores of a row of bores.
  • the greatest effect can be achieved in the area of the outer nozzle bores of a row of bores with the aid of the inlet chambers according to the invention, since previously a highly unstable flow had to be feared, particularly in the area of the outer nozzle bores of a row of bores.
  • the inlet chambers can be formed as recesses of the nozzle head which are hemispherical in cross section.
  • the hemispherical recesses advantageously allow the creation of exactly the same contact angle over the entire circumference of a nozzle bore.
  • the hemispherical recesses are expediently arranged in such a way that their center lies on the axis of the respectively assigned nozzle bore, so that it is centered with respect to the center of the assigned input chamber.
  • each nozzle bore has a corresponding one in a simple manner Entrance chamber can be assigned without the nozzle head being weakened too much.
  • the hemispherical recesses can easily be arranged so that in the region between two mutually adjacent recesses there is in each case a stationary web which can function as a guide web for the slide element, thereby protecting it against wear.
  • the inlet chambers are designed as ring segment-shaped recesses of the nozzle head.
  • a particularly inexpensive manufacture is possible here.
  • the configuration enables the contact angle to be achieved comparatively well adapted to a value of 90 ° in the transition region between a nozzle bore and the respectively assigned input chamber.
  • a step-shaped cross-sectional widening advantageously formed by a step-shaped cut-out can be provided at the outer end of the nozzle bore. This advantageously results in an axially normal boundary surface surrounding the outer end of the nozzle bores. This is ensures that disturbances of the jet are avoided, thereby stabilizing it, which favors the entrainment of air.
  • FIG. 1 shows a section through an injection valve according to the invention of a two-stroke large diesel engine
  • FIG. 2 shows an example with hemispherical inlet chambers on the basis of a horizontal section in the area of the nozzle bores through the nozzle head of an injection valve of a large two-stroke diesel engine
  • Figure 3 shows an example with ring segment-shaped
  • FIG. 4 shows a section along the line TV / TV in FIG. 3.
  • the injection valve 1 on which FIG. 1 is based consists of a sleeve-shaped, tapered jacket housing 2 which carries a nozzle head 4 provided with a blind bore 3. This is supported with a rear flange on a front collar of the casing 2. The rear end of the nozzle head 4 connects to a guide bush 5 which is accommodated in the casing 2 and which is provided with a through-bore 6 which is coaxial with the blind bore 3 of the nozzle head 4.
  • This has a step-shaped narrowing, which is designed as a valve seat 7, with which a valve body 8 cooperates, which projects from a shaft 9 arranged in the guide bush 5.
  • the diameter of the valve body 8 is smaller than the diameter of the stem 9, so that there is an annular space 10 surrounding the valve body 8 and belonging to the bore 6.
  • the shaft 9 is provided with a central bore 11 which is connected to a fuel line and can be acted upon with fuel and which is connected to the annular space 10 via branch bores 12.
  • the valve body 8 is pressed against the sealing seat 7 by the action of a return spring, not shown here, which cooperates with the stem 9. With a corresponding increase in pressure of the fuel present in the annular space 10, the valve body 8 is lifted off the associated sealing seat 7, which results in a connection of the area to which fuel can be applied to the blind bore 3 of the nozzle head 4.
  • the lower part of the nozzle head 4 is provided with a plurality of nozzle bores 13, which are arranged next to one another at approximately the same height and extend transversely to the axis of the blind bore 3 and through which the fuel can be injected into an assigned combustion chamber.
  • an annular slide element 15 is connected to the valve body 8 via a rod 14, the lower edge of which is one of the nozzle bores 13 traversing control edge, which is arranged so that the nozzle bores 13 are open when the valve body 8 is lifted from the associated valve seat 7 and that the nozzle bores 13 are closed when the valve body 8 abuts the valve seat 7. This position is the basis of Figure 1.
  • the nozzle bores 13 can be arranged axially normal or, as in FIG. 4, be slightly inclined outwards. Since the injection jet generated jointly by the nozzle bores 13 should not diverge too much, the nozzle bores 13 are not arranged radially with respect to the axis of the blind bore 3, but rather face a radial toward the main injection direction, so that there is a smaller diverging or scattering angle.
  • the nozzle bores 13 would pass through to the blind bore 3 without a change in cross-section, there would be very greatly differing inflow conditions to the individual nozzle bores 13 and also within individual nozzle bores 13.
  • the two outer nozzle bores 13 of the row of bores provided here which comprise four nozzle bores 13 arranged next to one another much longer than the inner nozzle bores 13, with different lengths also resulting in the area of these outer nozzle bores 13 over their circumference. These conditions would lead to poor combustion and thus to high fuel consumption and emissions, etc.
  • the nozzle bores 13 are assigned entrance chambers 16 which extend from the blind bore 3 and whose inside width is larger than the diameter of the nozzle bores 13.
  • hemispherical recesses 17 of the nozzle head 4 are provided to form the above-mentioned input chambers from the blind bore 3.
  • the hemispherical recesses 17 can easily be produced by electrolytic material removal with the aid of a device operating according to the EDM (electrical discharge machining) method.
  • the nozzle bores 13 themselves are simply drilled using a laser beam.
  • the hemispherical recesses 17 each forming an input chamber are arranged such that their center lies on the axis of the associated nozzle bore 13. In this way, the nozzle bores 13 are centered 10
  • each assigned hemispherical recesses 17 are dimensioned such that a web 19 remains between two adjacent hemispherical recesses 17, which can act as a guide web for the annular slide element 15, so that it is also reliably supported in the area of the entrance chambers is what is beneficial for achieving a long life.
  • the inlet bores 13 are assigned inlet chambers designed as annular segment-shaped recesses 20 of the nozzle head 4.
  • the radii of the ring segment-shaped recesses 20 are adapted to the respectively assigned nozzle bore 13 or nozzle bores 13 in such a way that in the transition region 11
  • each nozzle bore 13 its own entrance chamber formed by a ring segment 20.
  • the two middle nozzle bores 13 are assigned a common input chamber formed by a ring segment 20.
  • This ring segment 20 corresponds to a section of an annular groove coaxial with the axis of the blind bore 3 of the nozzle head 4 and is delimited by the adjacent ring segments 20, which have a smaller radius and are assigned to the two outer nozzle bores 13.
  • outer ring segments 20 are arranged so that their center is on the axis of the respectively assigned nozzle bore 13, so that it is centered with respect to the associated input chamber, which contributes to an equalization of the inflow conditions over the entire circumference of the bore.
  • the center point of the ring segment 20 assigned to the two middle nozzle bores 13 is in the area between the two axes of the two assigned nozzle bores 13.
  • a cutout 22 having a larger diameter than the nozzle bores 13 is provided in the area of the outer end of the nozzle bores 13, in the example on which FIGS. 3 and 4 are based. This leads to a step-like cross-sectional widening with an annular surface 23 which is normal to the respective bore axis and surrounds the end of the bore 12
  • Cut-out 22 ensures that the jet emerging from the nozzle bore 13 does not experience any interference.

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 dispositif d'injection de carburant pour moteurs à combustion interne, notamment de grands moteurs diesel deux temps. Ce système comprend une tête d'injecteur (4) excentrique, faisant saillie dans une chambre de combustion associée et présentant un trou borgne (3) qui peut être sollicité par le carburant et d'où partent plusieurs alésages (13). Au moins les axes des alésages (13) extérieurs de la série d'alésages sont inclinés vers l'intérieur par rapport à un gradient radial, ce qui permet d'obtenir au niveau de tous les alésages (13), approximativement les mêmes rapports en termes d'entrée de carburant et par conséquent un jet stable. Des chambres d'entrée (16) partant du trou borgne (3) sont associées à au moins une partie des alésages (13). La largeur intérieure de ces chambres d'entrée est supérieure au diamètre des alésages (13) et lesdites chambres d'entrée se présentant de manière qu'il y ait au niveau de tous les alésages (13) de la série d'alésages des rapports de longueurs au moins en équilibre mutuel.
EP99914552A 1998-04-09 1999-03-27 Systeme d'injection de carburant Expired - Lifetime EP0988449B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19815918A DE19815918A1 (de) 1998-04-09 1998-04-09 Brennstoffeinspritzvorrichtung
DE19815918 1998-04-09
PCT/EP1999/002117 WO1999053196A1 (fr) 1998-04-09 1999-03-27 Systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0988449A1 true EP0988449A1 (fr) 2000-03-29
EP0988449B1 EP0988449B1 (fr) 2003-07-16

Family

ID=7864095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99914552A Expired - Lifetime EP0988449B1 (fr) 1998-04-09 1999-03-27 Systeme d'injection de carburant

Country Status (9)

Country Link
EP (1) EP0988449B1 (fr)
JP (1) JP3308551B2 (fr)
KR (1) KR100361442B1 (fr)
CN (1) CN1093226C (fr)
AU (1) AU3332799A (fr)
DE (2) DE19815918A1 (fr)
PL (1) PL202429B1 (fr)
RU (1) RU2175728C2 (fr)
WO (1) WO1999053196A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3147477B1 (fr) 2015-09-23 2018-10-17 Winterthur Gas & Diesel AG Système d'alimentation en gaz et chemise de cylindre pour un moteur à combustion interne à piston élévateur, moteur à combustion interne à piston élévateur, ainsi que procédé de fonctionnement d'un moteur à combustion interne à piston élévateur
EP3015679B1 (fr) 2014-10-31 2018-12-05 Winterthur Gas & Diesel AG Cylindre pour un moteur a combustion interne a piston elevateur, moteur a combustion interne a piston elevateur, ainsi que procede de fonctionnement d'un moteur a combustion interne a piston elevateur
EP3015699B1 (fr) 2014-10-31 2018-12-05 Winterthur Gas & Diesel AG Système d'alimentation en gaz équipé d'un système de contrôle et cylindre pour un moteur à combustion interne à piston élévateur, moteur à combustion interne à piston élévateur, ainsi que procédé de fonctionnement d'un moteur à combustion interne à piston élévateur

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE10050704A1 (de) * 2000-10-13 2003-02-20 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE10132449A1 (de) * 2001-07-04 2003-01-23 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10307931A1 (de) 2003-02-25 2004-10-28 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10330256A1 (de) * 2003-07-04 2005-01-20 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10354467A1 (de) * 2003-11-21 2005-06-09 Robert Bosch Gmbh Brennstoffeinspritzventil
WO2008071187A1 (fr) * 2006-12-15 2008-06-19 Man Diesel A/S Injecteur de carburant conçu pour un moteur thermique
CN101558231B (zh) * 2006-12-15 2012-01-04 曼柴油机涡轮机欧洲股份公司曼柴油机涡轮机德国分公司 内燃机用的燃料喷射器
KR20090012056A (ko) * 2007-07-27 2009-02-02 베르트질레 슈바이츠 악티엔게젤샤프트 연료용 분사 노즐
ATE483108T1 (de) * 2007-08-31 2010-10-15 Waertsilae Nsd Schweiz Ag Einspritzdüse zum einspritzen von brennstoff
JP5071090B2 (ja) 2007-12-17 2012-11-14 株式会社Ｉｈｉ ディーゼルエンジンの燃料噴射方法及びディーゼルエンジン
EP2239451B1 (fr) * 2009-03-30 2011-09-07 Wärtsilä Switzerland Ltd. Injecteur de carburant pour moteurs à combustion interne
EP2386745B1 (fr) * 2010-05-11 2013-02-13 Wärtsilä Switzerland Ltd. Injecteur de carburant pour moteurs à combustion interne
DK177456B1 (en) * 2011-06-27 2013-06-17 Man Diesel & Turbo Deutschland A fuel valve for large turbocharged two stroke diesel engines
DE102012209326A1 (de) * 2012-06-01 2013-12-05 Robert Bosch Gmbh Brennstoffeinspritzventil
DK178692B1 (en) 2015-04-22 2016-11-21 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland A fuel valve for a large two-stroke self-igniting internal combustion engine
RU2690702C1 (ru) * 2015-11-10 2019-06-05 Ниссан Мотор Ко., Лтд. Способ и устройство управления для двигателя внутреннего сгорания

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EP0067143A1 (fr) * 1981-06-10 1982-12-15 Friedmann & Maier Aktiengesellschaft Buse d'injection de carburant
DE3306078A1 (de) * 1983-02-22 1984-08-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen
JPS59152176U (ja) * 1983-03-31 1984-10-12 三菱自動車工業株式会社 燃料噴射ノズル
CH665453A5 (de) * 1985-01-11 1988-05-13 Sulzer Ag Zylinderdeckel fuer eine kolbenbrennkraftmaschine.
GB8817774D0 (en) * 1988-07-26 1988-09-01 Lucas Ind Plc Fuel injectors for i c engines
JPH0267459A (ja) * 1988-08-31 1990-03-07 Nippon Denso Co Ltd 燃料噴射ノズル
JP2819702B2 (ja) * 1989-12-12 1998-11-05 株式会社デンソー 燃料噴射弁
US5026462A (en) * 1990-03-06 1991-06-25 Ail Corporation Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
DK167502B1 (da) * 1991-10-04 1993-11-08 Man B & W Diesel Gmbh Braendselsinjektor til forbraendingsmotorer
EP0809017A1 (fr) * 1996-05-22 1997-11-26 Steyr-Daimler-Puch Aktiengesellschaft Injecteur de carburant à deux étages pour moteurs à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9953196A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3015679B1 (fr) 2014-10-31 2018-12-05 Winterthur Gas & Diesel AG Cylindre pour un moteur a combustion interne a piston elevateur, moteur a combustion interne a piston elevateur, ainsi que procede de fonctionnement d'un moteur a combustion interne a piston elevateur
EP3015699B1 (fr) 2014-10-31 2018-12-05 Winterthur Gas & Diesel AG Système d'alimentation en gaz équipé d'un système de contrôle et cylindre pour un moteur à combustion interne à piston élévateur, moteur à combustion interne à piston élévateur, ainsi que procédé de fonctionnement d'un moteur à combustion interne à piston élévateur
EP3147477B1 (fr) 2015-09-23 2018-10-17 Winterthur Gas & Diesel AG Système d'alimentation en gaz et chemise de cylindre pour un moteur à combustion interne à piston élévateur, moteur à combustion interne à piston élévateur, ainsi que procédé de fonctionnement d'un moteur à combustion interne à piston élévateur

Also Published As

Publication number Publication date
CN1263584A (zh) 2000-08-16
AU3332799A (en) 1999-11-01
PL202429B1 (pl) 2009-06-30
WO1999053196A1 (fr) 1999-10-21
KR20010013569A (fr) 2001-02-26
KR100361442B1 (ko) 2002-11-21
PL337334A1 (en) 2000-08-14
RU2175728C2 (ru) 2001-11-10
JP3308551B2 (ja) 2002-07-29
EP0988449B1 (fr) 2003-07-16
JP2000516687A (ja) 2000-12-12
DE19815918A1 (de) 1999-10-21
DE59906287D1 (de) 2003-08-21
CN1093226C (zh) 2002-10-23

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