EP0283154A1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

Info

Publication number
EP0283154A1
EP0283154A1 EP88301692A EP88301692A EP0283154A1 EP 0283154 A1 EP0283154 A1 EP 0283154A1 EP 88301692 A EP88301692 A EP 88301692A EP 88301692 A EP88301692 A EP 88301692A EP 0283154 A1 EP0283154 A1 EP 0283154A1
Authority
EP
European Patent Office
Prior art keywords
valve member
seating surface
nozzle
truncated
gap
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.)
Withdrawn
Application number
EP88301692A
Other languages
German (de)
English (en)
Inventor
David John Gaskell
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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
Priority claimed from GB878706088A external-priority patent/GB8706088D0/en
Priority claimed from GB878716657A external-priority patent/GB8716657D0/en
Priority claimed from GB878721692A external-priority patent/GB8721692D0/en
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0283154A1 publication Critical patent/EP0283154A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F02M61/06—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
    • F02M61/16—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

  • This invention relates to a fuel injection nozzle for supplying fuel to an internal combustion engine, the nozzle being of the so-called inwardly opening type and comprising a nozzle body in which is defined a bore at one end of which is formed a truncated conical seating surface, the nozzle body defining a further surface downstream of the seating surface and which forms a "sac" volume from which extends an outlet orifice, a valve member slidable in the bore and adapted for co-operation with the seating surface to control the flow of fuel through the outlet orifice from a fuel inlet.
  • Such a nozzle is utilised to supply fuel to a compression ignition engine and it is desirable with such engines that the initial flow of fuel to the engine should be at a restricted rate.
  • the gap between the valve member and the seating surface during the initial movement of the valve member away from the seating surface does form a restriction to the flow of fuel.
  • the valve member is provided with a conical portion having a cone angle which is slightly greater than the cone angle of the seating surface. The effect is that in the closed position of the valve member line contact is established between the conical portion of the valve member and the seating surface. As the valve member lifts from the seating surface the zone of maximum restriction to the flow of fuel advances along the seating surface towards the "sac" volume.
  • the cone angle is about 60° the range of movement of the valve member during which restriction to the flow of fuel is obtained is small and within that range the degree of restriction is very sensitive to the lift of the valve member.
  • the valve member is invariably lifted from the seating surface by the action of the fuel pressure supplied by the associated fuel injection pump and since the pressure can rise very quickly, there is substantially no control of the initial rate of fuel flow.
  • the sensitivity to valve member lift can be reduced and the aforesaid range of movement increased, by reducing the cone angle but this can lead to problems in that the valve member can become wedged into the seating surface.
  • the object of the present invention is to provide a nozzle of the kind specified in which the sensitivity of the restriction to the flow of fuel to the lift of the valve member is reduced and the range of movement during which restriction is obtained, is increased.
  • a nozzle of the kind specified comprises a flow restriction gap downstream of the seating, said gap being defined between an extension on the valve member and the valve body, the degree of restriction offered by said gap decreasing at a lower rate as the valve member is lifted from the seating surface, than the degree of restriction between the valve member and the seating surface.
  • the nozzle comprises a nozzle body 10 in which is formed a bore 11.
  • the nozzle body is shaped at one end to form a nozzle tip 12 in which is formed in the example, a pair of outlet orifices 13.
  • the bore 11 at the tip end of the nozzle defines a truncated seating surface 14 which leads into a second truncated surface 15 which in turn leads into a "sac" volume 16 from which extends the outlet orifices 13.
  • valve member 17 Located within the bore 11 is a valve member 17 the portion of the valve member seen in the drawing being of reduced diameter as compared with the bore so as to define an annular gap 18 to which fuel under pressure is supplied from a nozzle inlet, the nozzle inlet in use being connected to the outlet of a fuel injection pump.
  • the valve member At another position in the nozzle body the valve member has a diameter corresponding to that of the bore so as to form a sliding fit therewith and the valve member defines an additional annular surface which is exposed to the pressure at the fuel inlet.
  • the lower end of the valve member defines three truncated conical portions 19, 20 and 21.
  • the conical portion 19 has a cone angle which is smaller than the cone angle of the seating surface 14 whilst the portion 20 has a cone angle which in the usual manner is slightly larger than that of the seating surface 14.
  • the cone angle of the surface 14 is indicated by the letter A.
  • the portion 21 of the valve member and which extends into the volume 16 has a cone angle which is the same as the cone angle of the surface 15, this cone angle being indicated by the letter B. It will be noted however that the surface of the portion 21 of the valve member is parallel to and spaced from the surface 15 so as to form a clearance and to ease the machining of the valve member, an undercut 22 is provided at the junction of the portions 20 and 21 of the valve member.
  • valve member In operation, when fuel under pressure is supplied to the aforesaid inlet the valve member will be lifted against the action of a spring, away from the seating surface 14. Initially the maximum restriction to the flow of fuel will be between the seating surface 14 and the junction of the portions 19 and 20 of the valve member. However, with a further slight increase in the lift of the valve member the point of maximum restriction will transfer to the gap defined between the conical portion 21 of the valve member and the lower end of the surface 15 that is to say at the junction of the surface 15 with the wall of the volume 16.
  • the cone angle of the conical portion 21 of the valve member is smaller than that of the seating surface 14 and the portion 20 of the valve member, the variation in the degree of restriction offered to the flow of fuel as the valve member lifts from its seating, will be appreciably less than in the standard nozzle where the portion 21 and the surface 15 are not provided. The rate of increase in flow of fuel for a given increase in the lift of the valve member will therefore be considerably less.
  • Figure 2 illustrates a modification to the nozzle shown in Figure 1 and the essential difference is that the portion 21 of the valve member of Figure 1 is replaced by a cylindrical extension 23 which extends in the closed position of the valve member to within the volume 16.
  • the valve member has a conical portion at its lower end and the conical portion 24 in Figure 2, forms a junction 25 with the cylindrical portion 23 and it is the gap between the junction 25 and the surface 15 which provides the variable restriction.
  • the angle A is nominally 60° and the angle B is nominally 30°.
  • the angle B may be reduced to say 10° in order to further reduce the sensitivity of the flow area to the lift of the valve member.
  • the portion 21 of the valve member of Figure 1 must be sufficiently short so as to avoid restriction to the flow of fuel at the maximum lift of the valve member.
  • Figure 3 shows a modification of the example shown in Figure 2 in which the second truncated conical surface 15 of the example of Figure 2 is replaced by a curved control surface 26.
  • the effect of the curved surface is the same as the truncated surface, the degree of restriction between the junction 25 and the surface 26 reducing as the valve member is moved away from the seating.
  • FIG. 4 shows a further modification in which the seating surface 14 connects directly with the cylindrical wall of the volume 16, an annular control edge 27 being defined at the junction thereof.
  • the lower end of the valve member defines three truncated conical portions 19, 20, 28.
  • the conical portion 19 has a cone angle which is slightly smaller than the cone angle of the seating surface 14 whilst the cone angle of the portion 20 has a cone angle which is slightly larger than that of the seating surface.
  • the extension or portion 28 of the valve member extends into the volume 16 and has a cone angle which is very much smaller than that of the seating surface, in the particular example the cone angle is 10°.
  • the surface of the portion 28 is spaced from the edge 27 and the area of the flow path thus formed varies as the valve member moves away from the seating surface.
  • the rate of decrease will be substantially as compared with a standard nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP88301692A 1987-03-14 1988-02-26 Injecteur de combustible Withdrawn EP0283154A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB8706088 1987-03-14
GB878706088A GB8706088D0 (en) 1987-03-14 1987-03-14 Fuel injection nozzle
GB878716657A GB8716657D0 (en) 1987-07-15 1987-07-15 Fuel injection nozzle
GB8716657 1987-07-15
GB878721692A GB8721692D0 (en) 1987-09-15 1987-09-15 Fuel injection nozzle
GB8721692 1987-09-15

Publications (1)

Publication Number Publication Date
EP0283154A1 true EP0283154A1 (fr) 1988-09-21

Family

ID=27263349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301692A Withdrawn EP0283154A1 (fr) 1987-03-14 1988-02-26 Injecteur de combustible

Country Status (2)

Country Link
EP (1) EP0283154A1 (fr)
JP (1) JPS63248967A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033679A (en) * 1987-10-30 1991-07-23 Golev Vladislav I Injector nozzle for a diesel engine
EP0404407B1 (fr) * 1989-06-23 1992-12-16 Lucas Industries Public Limited Company Buse d'injection de combustible
WO2001018387A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Buse d'injection pour moteurs a combustion interne avec pointeau pourvu d'une rainure annulaire
EP1180596A1 (fr) * 2000-07-18 2002-02-20 Delphi Technologies, Inc. Injecteur
WO2004074676A1 (fr) * 2003-02-18 2004-09-02 Robert Bosch Gmbh Soupape d'injection de carburant destinee a des moteurs a combustion interne
WO2004076850A1 (fr) * 2003-02-25 2004-09-10 Robert Bosch Gmbh Buse d'injection a trou borgne et a siege perfore destinee a un moteur a combustion interne et presentant un cone de transition entre le trou borgne et le siege d'aiguille de buse
EP1498602A2 (fr) * 2003-07-15 2005-01-19 Delphi Technologies, Inc. Soupape d'injection
WO2006007620A1 (fr) * 2004-07-22 2006-01-26 Robert Bosch Gbmh Injecteur
US7000856B2 (en) 2001-05-10 2006-02-21 Robert Bosch Gmbh Valve with radial recesses
EP1717440A1 (fr) * 2005-04-26 2006-11-02 Denso Corporation Buse d'injection de fluide
WO2007017302A1 (fr) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Element de soupape d'injection reduisant partiellement l'etranglement pour injecteurs de carburant
US8919677B2 (en) 2010-03-22 2014-12-30 Delphi International Operations Luxembourg S.A.R.L. Injection nozzle
WO2014206610A1 (fr) * 2013-06-25 2014-12-31 Robert Bosch Gmbh Ensemble buse pour un injecteur de carburant et injecteur de carburant
WO2016150591A1 (fr) * 2015-03-25 2016-09-29 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs à combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011256837A (ja) * 2010-06-11 2011-12-22 Toyota Motor Corp 燃料噴射弁

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE837337C (de) * 1944-03-04 1952-04-21 Kloeckner Humboldt Deutz Ag Einspritzventil mit Mehrlochduese
DE894789C (de) * 1949-12-11 1953-10-29 Daimler Benz Ag Fluessigkeitsgesteuerte Einspritzduese mit konischem Zapfen fuer Brennkraftmaschinen
FR2383320A1 (fr) * 1977-03-08 1978-10-06 Bosch Gmbh Robert Injecteur de carburant
GB2029508A (en) * 1978-09-08 1980-03-19 Bendix Corp Fuel injector valve with contoured flow nozzle
GB2034816A (en) * 1978-11-24 1980-06-11 Maschf Augsburg Nuernberg Ag Multi-aperture injection nozzle for an air compression internal combustion engine
GB2083134A (en) * 1980-09-05 1982-03-17 Nissan Motor Throttling pin type fuel injection valve
GB2138073A (en) * 1983-04-11 1984-10-17 Roberto Bosio Fuel injector nozzle for diesel engines
GB2143274A (en) * 1983-07-12 1985-02-06 Lucas Ind Plc Fuel injection nozzle
US4524914A (en) * 1983-01-27 1985-06-25 Diesel Kiki Co., Ltd. Throttling pintle-type fuel injection nozzle having an improved initial injection characteristic

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE837337C (de) * 1944-03-04 1952-04-21 Kloeckner Humboldt Deutz Ag Einspritzventil mit Mehrlochduese
DE894789C (de) * 1949-12-11 1953-10-29 Daimler Benz Ag Fluessigkeitsgesteuerte Einspritzduese mit konischem Zapfen fuer Brennkraftmaschinen
FR2383320A1 (fr) * 1977-03-08 1978-10-06 Bosch Gmbh Robert Injecteur de carburant
GB2029508A (en) * 1978-09-08 1980-03-19 Bendix Corp Fuel injector valve with contoured flow nozzle
GB2034816A (en) * 1978-11-24 1980-06-11 Maschf Augsburg Nuernberg Ag Multi-aperture injection nozzle for an air compression internal combustion engine
GB2083134A (en) * 1980-09-05 1982-03-17 Nissan Motor Throttling pin type fuel injection valve
US4524914A (en) * 1983-01-27 1985-06-25 Diesel Kiki Co., Ltd. Throttling pintle-type fuel injection nozzle having an improved initial injection characteristic
GB2138073A (en) * 1983-04-11 1984-10-17 Roberto Bosio Fuel injector nozzle for diesel engines
GB2143274A (en) * 1983-07-12 1985-02-06 Lucas Ind Plc Fuel injection nozzle

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033679A (en) * 1987-10-30 1991-07-23 Golev Vladislav I Injector nozzle for a diesel engine
EP0404407B1 (fr) * 1989-06-23 1992-12-16 Lucas Industries Public Limited Company Buse d'injection de combustible
WO2001018387A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Buse d'injection pour moteurs a combustion interne avec pointeau pourvu d'une rainure annulaire
KR100737712B1 (ko) * 1999-09-04 2007-07-11 로베르트 보쉬 게엠베하 노즐 니들에 환형 홈을 구비한 내연 기관용 분사 노즐
US7128280B1 (en) * 1999-09-04 2006-10-31 Robert Bosch Gmbh Injection nozzle for internal combustion engines, which has an annular groove in the nozzle needle
EP1180596A1 (fr) * 2000-07-18 2002-02-20 Delphi Technologies, Inc. Injecteur
US6682003B2 (en) 2000-07-18 2004-01-27 Delphi Technologies, Inc. Injection nozzle
US7000856B2 (en) 2001-05-10 2006-02-21 Robert Bosch Gmbh Valve with radial recesses
WO2004074676A1 (fr) * 2003-02-18 2004-09-02 Robert Bosch Gmbh Soupape d'injection de carburant destinee a des moteurs a combustion interne
WO2004076850A1 (fr) * 2003-02-25 2004-09-10 Robert Bosch Gmbh Buse d'injection a trou borgne et a siege perfore destinee a un moteur a combustion interne et presentant un cone de transition entre le trou borgne et le siege d'aiguille de buse
EP1498602A3 (fr) * 2003-07-15 2005-05-04 Delphi Technologies, Inc. Soupape d'injection
EP1498602A2 (fr) * 2003-07-15 2005-01-19 Delphi Technologies, Inc. Soupape d'injection
EP1967730A1 (fr) * 2003-07-15 2008-09-10 Delphi Technologies, Inc. Buse à injection
WO2006007620A1 (fr) * 2004-07-22 2006-01-26 Robert Bosch Gbmh Injecteur
EP1717440A1 (fr) * 2005-04-26 2006-11-02 Denso Corporation Buse d'injection de fluide
WO2007017302A1 (fr) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Element de soupape d'injection reduisant partiellement l'etranglement pour injecteurs de carburant
US8919677B2 (en) 2010-03-22 2014-12-30 Delphi International Operations Luxembourg S.A.R.L. Injection nozzle
WO2014206610A1 (fr) * 2013-06-25 2014-12-31 Robert Bosch Gmbh Ensemble buse pour un injecteur de carburant et injecteur de carburant
WO2016150591A1 (fr) * 2015-03-25 2016-09-29 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs à combustion interne

Also Published As

Publication number Publication date
JPS63248967A (ja) 1988-10-17

Similar Documents

Publication Publication Date Title
US5890660A (en) Fuel injection nozzle
EP0283154A1 (fr) Injecteur de combustible
US4153205A (en) Short seat fuel injection nozzle valve
US3035780A (en) Fuel injection nozzles for internal combustion engines
US6257506B1 (en) Fuel injector for auto-ignition internal combustion engines
US4151958A (en) Fuel injection nozzle
US5538187A (en) Fuel injection device for internal combustion engines
US4506833A (en) Fuel injection nozzle for an internal combustion engine
EP1136693B1 (fr) Aiguille pour un injecteur de carburant d'un moteur à combustion interne
EP0451408A1 (fr) Soupape d'injection de combustible
GB2086473A (en) Fuel injection valve for compression ignition engines
US5899385A (en) Fuel injection valve for internal combustion engines
US6053425A (en) Injector
US4413780A (en) Fuel injection nozzles
US4836454A (en) Fuel injection nozzles
US4552310A (en) Fuel injection nozzles
EP0460326A1 (fr) Buse d'injection de combustible
US6502554B1 (en) Fuel injection valve for internal combustion engines
US4153200A (en) Fuel injection nozzles
US4981267A (en) Fuel injection nozzle
US4917306A (en) Fuel injection nozzle
GB2203795A (en) I.C. engine fuel injection nozzle
US4706887A (en) Fuel injection nozzles
EP1344931B1 (fr) Buse d'injection
GB2255802A (en) Pintle fuel injection nozzle.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19881220

17Q First examination report despatched

Effective date: 19890530

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19890904

R18W Application withdrawn (corrected)

Effective date: 19890904