EP2405127B1 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP2405127B1
EP2405127B1 EP10168684A EP10168684A EP2405127B1 EP 2405127 B1 EP2405127 B1 EP 2405127B1 EP 10168684 A EP10168684 A EP 10168684A EP 10168684 A EP10168684 A EP 10168684A EP 2405127 B1 EP2405127 B1 EP 2405127B1
Authority
EP
European Patent Office
Prior art keywords
cut
longitudinal bore
sealing portion
fuel injector
inlet openings
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
EP10168684A
Other languages
German (de)
English (en)
Other versions
EP2405127A1 (fr
Inventor
Turhan Yildirim
Pierpaolo Miotti
Reiner Schulz
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.)
Wartsila Switzerland Ltd
Original Assignee
Wartsila Switzerland Ltd
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 Wartsila Switzerland Ltd filed Critical Wartsila Switzerland Ltd
Priority to EP10168684A priority Critical patent/EP2405127B1/fr
Priority to DK10168684.8T priority patent/DK2405127T3/da
Priority to JP2011039839A priority patent/JP5822254B2/ja
Priority to KR1020110016811A priority patent/KR20120004911A/ko
Priority to CN201110189157.XA priority patent/CN102312763B/zh
Publication of EP2405127A1 publication Critical patent/EP2405127A1/fr
Application granted granted Critical
Publication of EP2405127B1 publication Critical patent/EP2405127B1/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
    • F02M61/16—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
    • 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
    • F02M61/042—The valves being provided with fuel passages
    • 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

Definitions

  • the present invention relates to a fuel injector for internal combustion engines.
  • the invention relates in particular to a fuel injector for large two-stroke internal combustion engines, such as diesel engines for naval propulsion.
  • the present invention relates to a fuel injector according to the preamble of claim 1, comprising an atomizer fixed at a lower end of a valve guide and provided with a plurality of nozzle bores, a spindle having a valve portion cooperating with a valve seat of the valve guide, and a cut-off element extending into a longitudinal bore of the atomizer to reduce the volume in fluid connection with the nozzle bores when the spindle is in a closed position.
  • EP-A-052937 discloses a fuel injector comprising an axially displaceable spindle having a valve portion which cooperates with a corresponding valve seat of the valve guide and a cut-off element extending below the valve portion of the valve spindle into a central bore of the atomizer.
  • the outer wall of the cut-off element is effective to open and close inlet openings of the nozzle bores.
  • the nozzle bores are arranged in a single row, i.e. the inlet openings of the nozzle bores are all placed at approximately the same distance from the lower end of the atomizer.
  • a problem of this solution is that the total number of nozzle bores arranged within a maximum angle cannot be increased without compromising the strength of the side wall of the atomizer.
  • W02008/071187 discloses a fuel injector according to the preamble of claim 1, wherein the inlet openings of the nozzle bores of the atomizer are arranged in a first row and in a second row axially spaced apart and separated from each other by a cylindrical sealing portion.
  • a cut-off element extending into a longitudinal bore of the atomizer has a first cylindrical section arranged to open and close the lower row of inlet openings and a second cylindrical section cooperating with a secondary valve seat for closing off the upper row of inlet openings when the valve spindle is closed.
  • the lower row of inlet openings is supplied by fuel flowing through a central duct of the cut-off element and the upper row of inlet openings is supplied by fuel flowing in an annular passage defined between the inner wall of the atomizer bore and the outer surface of the cut-off element.
  • the object of the present invention is to provide improved injector designs which overcome the problems caused by the fluid dynamic forces which act on the cut-off element.
  • the reference number 10 indicates the lower portion of an atomizer for a fuel injector for diesel engines.
  • the atomizer 10 consists of a cylindrical body of corrosion-resistant material with a closed rounded bottom end 12.
  • the atomizer 10 has a longitudinal bore 14 closed at its bottom end and having a longitudinal axis A.
  • a plurality of nozzle bores 16 is formed in the lateral wall of the atomizer 10.
  • the nozzle bores 16 have respective inner openings 18 facing into the longitudinal bore 14 and outlet openings 20 open on the outer surface of the atomizer.
  • the inlet openings 18 of the nozzle bores 16 are divided into an upper group and a lower group, spaced apart from each other in the longitudinal direction A.
  • the injector includes a spindle (not visible in figure 1 ) having a cut-off element 22 which extends into the longitudinal bore 14 of the atomizer 10.
  • the cut-off element 22 is movable in the longitudinal direction A with respect to the longitudinal bore 14 between an open and a closed position.
  • the longitudinal bore 14 has an upper an a lower cylindrical sealing portion 24, 26.
  • the upper sealing portion 24 is above the upper group of inner openings 18 and the lower sealing portion 26 is below the lower group of inner openings 18.
  • the cut-off element 22 has a cylindrical upper sealing portion 28 and a cylindrical lower sealing portion 30. In the closed position the upper and lower sealing portions 28, 30 of the cut-off element 22 are in sealing contact respectively with the upper and lower sealing portions 24, 26 of the longitudinal bore 14 and define an upper cut-off section 32 and a lower cut-off section 34.
  • the cut-off element has a central duct 36 which in the closed position of the cut-off element 22 is in flow connection with the longitudinal bore 14 both above the upper cut-off section 32 and below the lower cut-off section 34.
  • the cut-off element 22 is provided with a supplementary guiding section 38 extending below the upper sealing portion 28 of the cut-off element 22.
  • the supplementary guiding section 38 is in guiding contact with the upper sealing portion 24 of the longitudinal bore 14.
  • the supplementary guiding section 38 includes a plurality of guiding ribs 40 spaced apart from each other in a circumferential direction and having outer cylindrical surfaces in sliding contact with the upper sealing portion 24. Channels 42 are formed between adjacent guiding ribs 40. The channels 42 allow passage of a flow of fuel through the upper cut-off section 32 in the open position of the cut-off element 22.
  • Figure 2 shows an alternative embodiment wherein the lower sealing portion 30 of the cut-off element 22 extends below the lower group of inner openings both in the closed and in the open position of the cut-off element 22.
  • the cut off element is guided on the lower sealing portion 30, below the lower group of inner openings 18.
  • manufacturing of the cut-off element 22 is simplified because drilling of relatively big holes on the cut off element 22 is avoided and only small holes might be required just to balance pressures on the end face of the cut-off element. No holes bigger than 35% of the diameter of the cut-off element 22 are formed. In this way the cut-off element 22 is subjected to much smaller stresses than in prior art designs thus increasing the reliability of the component. This design also provides a very high sac volume reduction.
  • Figures 3 and 4 show a further solution for closing the injection holes with nearly zero sac volume and without any radial forces caused by the fluid flow dynamic, which can lead to friction between the nozzle wall and valve body.
  • the cut-off element is designed as a pipe and a spherical element 44, such as a ball, is positioned on the bottom end of the longitudinal bore 14. In the closed position the bottom end of the cut-off element 22 abuts on the spherical element 44 and closes the main flow on the sealing surface of the spherical element 44.
  • an elastic disc 46 is provided at the upper end of the longitudinal bore 14.
  • a spindle 48 is provided with a conical sealing portion 50 above the cut-off element 22. The sealing area between the conical sealing portion 50 and the disc 46 is closed at the same time as the bottom end of the cut-off element 22 contacts the spherical element 44.
  • the embodiments of figures 2 , 3 and 4 are supposed to have the same guiding portion 38 as disclosed with reference to figure 1 , as well as all the other features of claim 1, in particular an upper and a lower group of inlet openings and upper and lower sealing portions of the longitudinal bore and the cut-off element.

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 (5)

  1. Injecteur de carburant pour moteurs à combustion interne, comprenant :
    - un atomiseur (10) ayant un alésage longitudinal (14) et une pluralité d'alésages de buse (16) ayant des ouvertures d'admission (18) faisant face audit alésage longitudinal (14), lesdites ouvertures d'admission (18) étant divisées en un groupe supérieur et un groupe inférieur, espacés l'un de l'autre dans une direction longitudinale (A), et
    - un élément découpé (22) s'étendant dans ledit alésage longitudinal (14) de l'atomiseur (10), l'élément découpé (22) étant mobile dans ladite direction longitudinale (A) par rapport à l'alésage longitudinal (14) entre une position ouverte et fermée,
    l'alésage longitudinal (14) et l'élément découpé (22) ayant des portions d'étanchéité supérieure et inférieure respectives (24, 28, 26, 30) coopérant les unes avec les autres dans ladite position fermée de l'élément découpé (22) afin de définir des sections découpées supérieure et inférieure (32, 34) qui s'étendent, respectivement, au-dessus du groupe supérieur d'ouvertures d'admission (18) et en dessous du groupe inférieur d'ouvertures d'admission (18),
    caractérisé en ce que l'élément découpé (22) est doté d'une section de guidage supplémentaire (38) qui est en contact de guidage avec la portion d'étanchéité supérieure (24) de l'alésage longitudinal (14), la section de guidage supplémentaire (38) comprenant une pluralité de nervures de guidage (40) ayant des surfaces externes cylindriques en contact coulissant avec ladite portion d'étanchéité supérieure cylindrique (24) de l'alésage longitudinal (14) dans ladite position ouverte de l'élément découpé (22), lesdites rainures de guidage (40) étant espacées circonférentiellement les unes des autres par des canaux (42) qui permettent le passage d'un flux de carburant à travers ces derniers dans la position ouverte de l'élément découpé (22).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la portion d'étanchéité inférieure (30) de l'élément découpé (22) dans ladite position ouverte de l'élément découpé (22) s'étend entre les groupes supérieur et inférieur d'ouvertures internes (18).
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que la portion d'étanchéité inférieure (30) de l'élément découpé (22) dans ladite position ouverte de l'élément découpé (22) s'étend en dessous du groupe inférieur d'ouvertures internes (18).
  4. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'élément découpé (22) a une extrémité inférieure qui dans ladite position fermée bute en contact d'étanchéité contre un élément sphérique (44).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce qu'un disque déformable (46) est agencé au niveau d'une extrémité supérieure de l'alésage longitudinal (14) et une portion d'étanchéité conique (50) est agencée au niveau d'une extrémité supérieure de l'élément découpé (22), ladite portion d'étanchéité conique (50) butant contre ledit disque déformable (46) dans la position fermée de l'élément découpé (22).
EP10168684A 2010-07-07 2010-07-07 Injecteur de carburant pour moteurs à combustion interne Not-in-force EP2405127B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10168684A EP2405127B1 (fr) 2010-07-07 2010-07-07 Injecteur de carburant pour moteurs à combustion interne
DK10168684.8T DK2405127T3 (da) 2010-07-07 2010-07-07 Brændstofindsprøjtningsindretning til motorer med indvendig forbrænding
JP2011039839A JP5822254B2 (ja) 2010-07-07 2011-02-25 内燃機関のための燃料噴射機
KR1020110016811A KR20120004911A (ko) 2010-07-07 2011-02-25 내연기관용 연료주입기
CN201110189157.XA CN102312763B (zh) 2010-07-07 2011-07-07 内燃发动机的燃料喷射器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10168684A EP2405127B1 (fr) 2010-07-07 2010-07-07 Injecteur de carburant pour moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP2405127A1 EP2405127A1 (fr) 2012-01-11
EP2405127B1 true EP2405127B1 (fr) 2013-04-03

Family

ID=42935560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10168684A Not-in-force EP2405127B1 (fr) 2010-07-07 2010-07-07 Injecteur de carburant pour moteurs à combustion interne

Country Status (5)

Country Link
EP (1) EP2405127B1 (fr)
JP (1) JP5822254B2 (fr)
KR (1) KR20120004911A (fr)
CN (1) CN102312763B (fr)
DK (1) DK2405127T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010040401A1 (de) * 2010-09-08 2012-03-08 Robert Bosch Gmbh Kraftstoffinjektor
JP5955258B2 (ja) * 2013-03-29 2016-07-20 三菱重工業株式会社 燃料噴射装置及びディーゼル機関
DE102017122117A1 (de) * 2017-09-25 2019-03-28 Man Diesel & Turbo Se Einspritzdüse für einen Dual-Fuel-Motor und Dual-Fuel-Motor
CN111237108A (zh) * 2020-03-12 2020-06-05 莆田市宏业精密机械有限公司 直接控制喷油嘴开关的高压共轨喷油器

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK495880A (da) 1980-11-20 1982-05-21 B & W Diesel As Braendselinjektor til forbraendingsmotorer
JPS6217363A (ja) * 1985-07-15 1987-01-26 Osamu Matsumura 燃料噴射装置
JPS62170769A (ja) * 1986-01-23 1987-07-27 Osamu Matsumura 燃料噴射装置
WO1987006650A1 (fr) * 1986-04-25 1987-11-05 Voest-Alpine Automotive Gesellschaft M.B.H. Injecteur pour moteurs a combustion interne
JP3560174B2 (ja) * 1994-05-17 2004-09-02 株式会社デンソー 流体噴射ノズル及びそれを用いた燃料噴射弁
JPH08144896A (ja) * 1994-11-25 1996-06-04 Zexel Corp 可変噴孔型燃料噴射ノズル
BR9605943A (pt) * 1995-03-29 1997-08-19 Bosch Gmbh Robert Disco perfurado particularmente para válvulas de injeção
WO1999014487A1 (fr) * 1997-09-16 1999-03-25 Robert Bosch Gmbh Disque perfore ou disque de pulverisation et soupape injectrice dotee d'un tel disque perfore ou disque de pulverisation
JPH11193766A (ja) * 1997-12-26 1999-07-21 Denso Corp 燃料噴射弁
JPH11351103A (ja) * 1998-06-13 1999-12-21 Toyota Central Res & Dev Lab Inc 燃料噴射弁
DE60024334T2 (de) * 1999-06-25 2006-08-10 Delphi Technologies, Inc., Troy Brennstoffeinspritzventil
JP2001099033A (ja) * 1999-09-30 2001-04-10 Denso Corp 燃料噴射弁
DE10134868A1 (de) * 2001-07-18 2003-02-13 Bosch Gmbh Robert Kraftstoffinjektor mit Schließdruckkompensation
EP1445476A1 (fr) * 2003-02-04 2004-08-11 Siemens VDO Automotive S.p.A. Aiguille de soupape et dispositif de dosage comprenant une telle aiguille
DE102005009148A1 (de) * 2005-03-01 2006-09-07 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied mit Doppelsitz
FR2890122A3 (fr) * 2005-08-25 2007-03-02 Renault Sas Injecteur de carburant pour moteur a combustion interne
JP2007231852A (ja) * 2006-03-01 2007-09-13 Toyota Motor Corp 燃料噴射装置
DE102006033878A1 (de) * 2006-07-21 2008-01-31 Siemens Ag Düsenbaugruppe für ein Einspritzventil und Einspritzventil
JP4483836B2 (ja) * 2006-08-07 2010-06-16 株式会社デンソー 燃料噴射ノズル
WO2008071187A1 (fr) 2006-12-15 2008-06-19 Man Diesel A/S Injecteur de carburant conçu pour un moteur thermique
JP2008231996A (ja) * 2007-03-20 2008-10-02 Toyota Motor Corp 内燃機関の制御装置
JP2008274792A (ja) * 2007-04-26 2008-11-13 Denso Corp 流体噴射ノズル
JP2009121402A (ja) * 2007-11-16 2009-06-04 Toyota Motor Corp 可変噴孔ノズル式の燃料噴射弁

Also Published As

Publication number Publication date
EP2405127A1 (fr) 2012-01-11
DK2405127T3 (da) 2013-04-22
KR20120004911A (ko) 2012-01-13
JP2012017732A (ja) 2012-01-26
CN102312763B (zh) 2017-03-01
CN102312763A (zh) 2012-01-11
JP5822254B2 (ja) 2015-11-24

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