EP2386745A1 - 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
EP2386745A1
EP2386745A1 EP10162498A EP10162498A EP2386745A1 EP 2386745 A1 EP2386745 A1 EP 2386745A1 EP 10162498 A EP10162498 A EP 10162498A EP 10162498 A EP10162498 A EP 10162498A EP 2386745 A1 EP2386745 A1 EP 2386745A1
Authority
EP
European Patent Office
Prior art keywords
cut
longitudinal bore
cylindrical sealing
atomizer
inner 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.)
Granted
Application number
EP10162498A
Other languages
German (de)
English (en)
Other versions
EP2386745B1 (fr
Inventor
Pierpaolo Miotti
Turhan Yildirim
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 EP10162498A priority Critical patent/EP2386745B1/fr
Priority to DK10162498.9T priority patent/DK2386745T3/da
Priority to JP2011042889A priority patent/JP5932227B2/ja
Priority to KR1020110026007A priority patent/KR101822195B1/ko
Priority to CN201110120946.8A priority patent/CN102242684B/zh
Publication of EP2386745A1 publication Critical patent/EP2386745A1/fr
Application granted granted Critical
Publication of EP2386745B1 publication Critical patent/EP2386745B1/fr
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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • F02M61/06—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 the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • 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
    • F02M61/16—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

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 a housing, a valve guide fixed at the lower end of the housing, an atomizer fixed at a lower end of the 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.
  • 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.
  • EP-A-1380750 discloses a fuel injector comprising a nozzle body provided with first and second outlet openings for fuel and a valve needle slidable within a valve needle bore defined in the nozzle body.
  • the valve needle bore is shaped to define a seating with which the valve needle is engageable to control fuel flow to a chamber.
  • the valve needle is provided with a flow passage communicating with the chamber and a first annular recess communicating with the first outlet opening. Movement of the valve needle away from the seating into a first fuel injecting position causes the chamber to communicate with the first annular recess to permit fuel delivery through the first outlet opening and movement of the valve needle away from the seating into a second fuel injecting position causes fuel in the chamber to flow through the flow passage for delivery through the second outlet opening.
  • the object of the present invention is to provide a new sliding injection valve combined with a needle which slides within the atomiser and controls the opening and closing of the injection holes directly without additional volume between nozzle holes and valve wall, capable of providing variable dosage capabilities by means of stepwise opening of the injection holes of the atomizer.
  • the reference number 10 indicates the end portion of a fuel injector for diesel engines according to the present invention.
  • the injector 10 is intended to be mounted into an elongated cavity formed in the head of the engine.
  • the injector 10 comprises a valve guide 12 having a longitudinal guide bore 14.
  • a chamber 16 is formed at the lower end of the guide bore 14.
  • the chamber 16 is in flow connection with a fuel supply duct 18.
  • a conical valve seat 20 is provided at the bottom end of the chamber 16 of the valve guide 12.
  • a short duct 22 extends downwardly of the valve seat 20 and opens on a front face 24 of the valve guide 12.
  • An atomizer 26 is fixed at a lower end of the valve guide 12.
  • the atomizer 26 has a cylindrical body 28 made of or coated by a corrosion-resistant material.
  • the body 28 has a closed bottom end 30.
  • An upper front face 32 of the atomizer 26 frontally abuts the front face 24 of the valve guide 12.
  • a circular upper flange 34 of the atomizer 26 engages a bottom cylindrical surface 36 of the guide valve 12.
  • a vertical pin 38 engages mutually facing openings of the valve guide 12 and of the atomizer 26 to set the atomizer 26 in a fixed angular position with respect to the valve guide 12.
  • the atomizer 26 is fixed to the valve guide 12 by means of a retaining element (not shown).
  • the atomizer 26 has a longitudinal bore 40 closed at its bottom end.
  • the upper end of the longitudinal bore 40 is in flow connection with the chamber 16 through the short duct 22 and the valve seat 20.
  • a plurality of nozzle bores 42', 42" is formed through the cylindrical body 28.
  • the nozzle bores 42', 42" have respective inner openings 44', 44" facing into the longitudinal bore 40 and outer openings 46', 46" open on the outer surface of the atomizer 26.
  • a spindle 48 is displaceable into the valve guide 12 along a direction coincident with the longitudinal axis A of the spindle 48.
  • the spindle 48 has a cylindrical portion 50 which slidably engages the longitudinal guide bore 14 of the valve guide 12.
  • the spindle 48 has a conical valve portion 52 which cooperates with the conical valve seat 20 of the valve guide 12.
  • the spindle 48 is controlled by an electric actuator (not shown) which moves the spindle between a closed position (shown in figure 1 ), a first open position and a second open position.
  • the spindle 48 comprises a cut-off element 54 which extends coaxially below the valve portion 52 and into the longitudinal bore 40 of the atomizer 26.
  • the cut-off element 54 is fixed to or integrally formed with the remaining part of the spindle 48.
  • the lower end of the cut-off element 54 has a cylindrical sealing portion 56 which engages with sealing contact a cylindrical sealing surface 58 of the longitudinal bore 40.
  • the cut-off element 54 has a central duct 60 which is in flow connection through transverse holes 62 with an upper region 64 of the longitudinal bore 40 located above the cylindrical sealing surface 58.
  • the central duct 60 is also in flow connection through a bottom opening 66 with a lower region 70 of the longitudinal bore 40 located below the lower cylindrical sealing surface 58.
  • annular duct 71 is defined between an inner surface of the longitudinal bore 40 and an outer surface of the cut-off element 54.
  • the transverse holes 62 of the cut-off element 54 are in flow connection with the annular duct 71.
  • Figures 2, 3 and 4 show the cut-off element in the positions corresponding, respectively, to the closed position, first open position and second open position of the spindle 48.
  • the inner openings 44', 44" of the nozzle bores 42', 42" are aligned or substantially aligned to each other in a circumferential direction.
  • the inner openings are divided in a first group 44' and a second group 44".
  • the first group includes at least one inner opening 44' positioned in a shallow recess 72 elongated in the longitudinal direction A and formed on the cylindrical sealing surface 58 of the longitudinal bore 40.
  • the or each recess 72 has a lower edge extending below the respective inner opening 44'.
  • the inner openings of the second group are open on the cylindrical sealing surface 58. When more recesses 72 are provided, the axial length of such recesses 72 can be different, as shown in figures 2-4 .
  • FIG. 5 A second embodiment is shown in figure 5 .
  • the elements corresponding to the ones previously described are indicated by the same reference numbers.
  • At least two of the nozzle bores 42', 42" have respective inner openings 44', 44" and outer openings 46', 46" spaced apart from each other in a direction parallel to the longitudinal axis A.
  • the inner openings 44', 44" are formed on the cylindrical sealing surface 58 of the atomizer 26.
  • the cylindrical sealing portion 56 of the cut-off element has an annular groove 74 which separates from each other an upper sealing portion 76 and a lower sealing portion 78 which cooperate in sealing contact with the cylindrical sealing surface 58 of the longitudinal bore 40.
  • FIG. 9 An alternative arrangement is shown in figures 9, 10 and 11 . Also in this case there are provided at least two nozzle bores 42', 42" with respective inner openings 44', 44" and outer openings 46', 46" spaced apart from each other in a direction parallel to the longitudinal axis A.
  • the cut-off element 54 has a cylindrical sealing portion 56 which is in continuous sealing contact with the cylindrical sealing surface 58 of the longitudinal bore 40 up to its lower edge 80.
  • the solutions according to the present invention allows to save fuel, to control injection rate and therefore to control the heat release in the combustion chamber, to reduce the NOx formation and to reduce the HC emissions.
  • the solution with nozzle hole substantially on one line allows also easier design and better needle guide in the sliding area.
  • one ore more injection holes are within a recess, which allows depending on the needle stroke to inject through the first holes.
  • the recesses might be in different heights.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP10162498A 2010-05-11 2010-05-11 Injecteur de carburant pour moteurs à combustion interne Active EP2386745B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10162498A EP2386745B1 (fr) 2010-05-11 2010-05-11 Injecteur de carburant pour moteurs à combustion interne
DK10162498.9T DK2386745T3 (da) 2010-05-11 2010-05-11 Brændstofindsprøjtningsindretning til motorer med indvendig forbrænding
JP2011042889A JP5932227B2 (ja) 2010-05-11 2011-02-28 内燃機関のための燃料噴射機
KR1020110026007A KR101822195B1 (ko) 2010-05-11 2011-03-23 내연기관용 연료분사기
CN201110120946.8A CN102242684B (zh) 2010-05-11 2011-05-11 内燃发动机的燃料喷射器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10162498A EP2386745B1 (fr) 2010-05-11 2010-05-11 Injecteur de carburant pour moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP2386745A1 true EP2386745A1 (fr) 2011-11-16
EP2386745B1 EP2386745B1 (fr) 2013-02-13

Family

ID=42735397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10162498A Active EP2386745B1 (fr) 2010-05-11 2010-05-11 Injecteur de carburant pour moteurs à combustion interne

Country Status (5)

Country Link
EP (1) EP2386745B1 (fr)
JP (1) JP5932227B2 (fr)
KR (1) KR101822195B1 (fr)
CN (1) CN102242684B (fr)
DK (1) DK2386745T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023073140A1 (fr) * 2021-10-29 2023-05-04 Ganser Crs Ag Soupape d'injection de carburant pour moteurs à combustion interne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
KR101638815B1 (ko) * 2016-01-07 2016-07-25 한빛정공(주) 4 행정용 인젝션 밸브
DE102017122117A1 (de) * 2017-09-25 2019-03-28 Man Diesel & Turbo Se Einspritzdüse für einen Dual-Fuel-Motor und Dual-Fuel-Motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948451A1 (de) * 1979-12-01 1981-06-04 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE19755062A1 (de) * 1997-12-11 1999-06-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19946906A1 (de) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1380750A1 (fr) 1999-06-25 2004-01-14 Delphi Technologies, Inc. Injecteur de carburant
WO2008071187A1 (fr) 2006-12-15 2008-06-19 Man Diesel A/S Injecteur de carburant conçu pour un moteur thermique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8817774D0 (en) * 1988-07-26 1988-09-01 Lucas Ind Plc Fuel injectors for i c engines
JPH0494426A (ja) * 1990-08-08 1992-03-26 Zexel Corp 分配型燃料噴射ポンプのロードタイマ
DE19815918A1 (de) * 1998-04-09 1999-10-21 Man B & W Diesel As Brennstoffeinspritzvorrichtung
JP2003106245A (ja) * 2001-09-27 2003-04-09 Toyota Motor Corp 燃料噴射弁
KR101043745B1 (ko) * 2006-12-15 2011-06-22 맨 디젤 앤드 터보 필리얼 아프 맨 디젤 앤드 터보 에스이 티스크랜드 내연기관용 연료분사기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948451A1 (de) * 1979-12-01 1981-06-04 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE19755062A1 (de) * 1997-12-11 1999-06-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1380750A1 (fr) 1999-06-25 2004-01-14 Delphi Technologies, Inc. Injecteur de carburant
DE19946906A1 (de) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2008071187A1 (fr) 2006-12-15 2008-06-19 Man Diesel A/S Injecteur de carburant conçu pour un moteur thermique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023073140A1 (fr) * 2021-10-29 2023-05-04 Ganser Crs Ag Soupape d'injection de carburant pour moteurs à combustion interne

Also Published As

Publication number Publication date
KR20110124699A (ko) 2011-11-17
KR101822195B1 (ko) 2018-03-08
DK2386745T3 (da) 2013-03-04
JP5932227B2 (ja) 2016-06-08
JP2011236887A (ja) 2011-11-24
CN102242684B (zh) 2016-01-27
CN102242684A (zh) 2011-11-16
EP2386745B1 (fr) 2013-02-13

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