EP0460326A1 - Buse d'injection de combustible - Google Patents

Buse d'injection de combustible Download PDF

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Publication number
EP0460326A1
EP0460326A1 EP90313450A EP90313450A EP0460326A1 EP 0460326 A1 EP0460326 A1 EP 0460326A1 EP 90313450 A EP90313450 A EP 90313450A EP 90313450 A EP90313450 A EP 90313450A EP 0460326 A1 EP0460326 A1 EP 0460326A1
Authority
EP
European Patent Office
Prior art keywords
orifices
valve member
seating
inner ends
bore
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Withdrawn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
EP90313450A
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
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0460326A1 publication Critical patent/EP0460326A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • This invention relates to fuel injection nozzles for supplying fuel to internal combustion engines, the nozzles being of the kind comprising a nozzle body in which is defined a blind bore, a frusto-conical seating at the blind end of the bore, a plurality of outlet orifices extending to the exterior of the nozzle body, said orifices having their inner ends terminating in the frusto-conical surface of the seating, and a valve member slidable in the bore and defining at its inner end a seat engaging portion which when the valve member is in the closed position co-operates with the seating to prevent flow of fuel through the orifices from a fuel inlet in the nozzle body, said seat engaging portion of the valve member when in engagement with the seating covering the inner ends of the orifices.
  • VCO nozzles valve covers orifice
  • VCO nozzles valve covers orifice
  • nozzle dribble of fuel can take place through the orifices from the fuel which remains in the "sac" volume after the valve member has closed.
  • VCO type of nozzle With a VCO type of nozzle the orifices in the closed position of the valve member are effectively closed.
  • known forms of VCO type nozzle appear to suffer from unequal fuel flows through the different orifices and this is thought to be due to dissimilar entry conditions at the inner ends of the orifices.
  • a nozzle having a "sac" volume from which the orifices extend is less prone to unequal fuel flows through the orifices.
  • the object of the invention is to provide a fuel injection nozzle of the kind specified in an improved form.
  • the lift of the valve member from its closed position to its open position is substantially equal to the diameter of the inner ends of the orifices and the valve member has a projection having a circumferential groove formed therein, the groove in the fully open position of the valve member being aligned with the inner ends of the orifices.
  • the nozzle comprises a nozzle body 10 in which is defined a blind bore 11 at the blind end of which there is formed a frusto-conical seating 12.
  • the seating extends into a cylindrical recess 13 which is formed during the machining of the bore 11 and the seating 12.
  • Slidable in the bore is a valve member 14 having its inner end portion of a diameter smaller than that of the bore 11 so as to define an annular space 15 which is connected to a fuel inlet not shown.
  • the valve member has a conical seat engaging portion 16 the cone angle of which is slightly greater than that of the seating 12.
  • valve member is biased into engagement with the seating by means of a coiled compression spring (not shown) and the valve member defines an area exposed to the pressure within the space 15 so that when fuel under pressure is admitted to the space the fuel pressure generates a force acting on the valve member to lift the valve member away from the seating against the action of the spring.
  • a plurality of outlet orifices 17 is provided, the orifices having their inner ends lying on the frusto-conical surface of the seating 12.
  • a projection 19 Extending beyond the seat engaging portion 16 of the valve member 14 is a projection 19 which is initially machined to conical form with a cone angle which is slightly greater than that of the seat engaging portion. In the closed position of the valve member the end of the projection 19 lies in close proximity to the end of the recess 13. The junction of the projection 19 and the seating is arranged so that in the closed position of the valve member it lies just beyond the inlet ends of the orifices 17.
  • the projection 19 is formed with a circumferential groove 18 which extends to the aforesaid junction.
  • the orifices 17 in the closed position of the valve member are effectively closed off from the space 13.
  • the lift of the valve member to attain the fully open position as shown in Figure 2 is substantially equal to the diameters of the orifices and the width of the groove 18 is also substantially equal to the lift.
  • the groove 18 is aligned with the inner ends of the orifices 17.
  • the fuel flows from the space 15 along the tapering annular gap between the inner end of the valve member and the seating. Some of the fuel flows directly into the inlet ends of the orifices. However, apart from the fact that the fuel flow has to divide to feed the two orifices it also has to flow towards the orifices.
  • the provision of the groove 18 on the valve member assists the division of the fuel and helps to ensure that the flow of fuel through the orifices is substantially equal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP90313450A 1990-06-08 1990-12-11 Buse d'injection de combustible Withdrawn EP0460326A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909012844A GB9012844D0 (en) 1990-06-08 1990-06-08 Fuel injection nozzles
GB9012844 1990-06-08

Publications (1)

Publication Number Publication Date
EP0460326A1 true EP0460326A1 (fr) 1991-12-11

Family

ID=10677312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90313450A Withdrawn EP0460326A1 (fr) 1990-06-08 1990-12-11 Buse d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0460326A1 (fr)
GB (1) GB9012844D0 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996019661A1 (fr) * 1994-12-20 1996-06-27 Lucas Industries Public Limited Company Injecteur de carburant
GB2308408A (en) * 1995-12-19 1997-06-25 Bosch Gmbh Robert Fuel injection valve for internal-combustion engines
GB2310893A (en) * 1996-03-09 1997-09-10 Bosch Gmbh Robert Fuel injection valve for i.c. engines
DE19844638A1 (de) * 1998-09-29 2000-03-30 Siemens Ag Kraftstoffeinspritzventil für eine Brennkraftmaschine
WO2001051804A3 (fr) * 2000-01-08 2001-12-06 Bosch Gmbh Robert Soupape d'injection de carburant pour moteurs a combustion interne
WO2011023467A1 (fr) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Injecteur de carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2383324A1 (fr) * 1977-03-09 1978-10-06 Bosch Gmbh Robert Buse d'injection de carburant pour moteurs a combustion interne
JPH0192569A (ja) * 1987-10-02 1989-04-11 Diesel Kiki Co Ltd 燃料噴射ノズル
EP0345348A1 (fr) * 1987-10-30 1989-12-13 Nauchno-Proizvodstvennoe Obiedinenie Po Toplivnoi Apparature Dvigatelei Atomiseur de gicleur diesel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2383324A1 (fr) * 1977-03-09 1978-10-06 Bosch Gmbh Robert Buse d'injection de carburant pour moteurs a combustion interne
JPH0192569A (ja) * 1987-10-02 1989-04-11 Diesel Kiki Co Ltd 燃料噴射ノズル
EP0345348A1 (fr) * 1987-10-30 1989-12-13 Nauchno-Proizvodstvennoe Obiedinenie Po Toplivnoi Apparature Dvigatelei Atomiseur de gicleur diesel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 300 (M-848)(3648) 11 July 1989, & JP-A-01 092569 (DIESEL KIKI) 11 April 1989, *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890660A (en) * 1994-12-20 1999-04-06 Lucas Industries Public Limited Company Fuel injection nozzle
WO1996019661A1 (fr) * 1994-12-20 1996-06-27 Lucas Industries Public Limited Company Injecteur de carburant
GB2308408B (en) * 1995-12-19 1998-02-18 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
GB2308408A (en) * 1995-12-19 1997-06-25 Bosch Gmbh Robert Fuel injection valve for internal-combustion engines
FR2745853A1 (fr) * 1996-03-09 1997-09-12 Bosch Gmbh Robert Injecteur de carburant pour moteur a combustion interne
GB2310893B (en) * 1996-03-09 1998-05-06 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
GB2310893A (en) * 1996-03-09 1997-09-10 Bosch Gmbh Robert Fuel injection valve for i.c. engines
DE19844638A1 (de) * 1998-09-29 2000-03-30 Siemens Ag Kraftstoffeinspritzventil für eine Brennkraftmaschine
US6546914B1 (en) 1998-09-29 2003-04-15 Siemens Aktiengesellschaft Fuel injection valve for an internal combustion engine
WO2001051804A3 (fr) * 2000-01-08 2001-12-06 Bosch Gmbh Robert Soupape d'injection de carburant pour moteurs a combustion interne
WO2011023467A1 (fr) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Injecteur de carburant
CN102625878A (zh) * 2009-08-28 2012-08-01 罗伯特·博世有限公司 燃料喷射阀
CN102625878B (zh) * 2009-08-28 2016-03-09 罗伯特·博世有限公司 燃料喷射阀
US9441590B2 (en) 2009-08-28 2016-09-13 Robert Bosch Gmbh Fuel injection valve

Also Published As

Publication number Publication date
GB9012844D0 (en) 1990-08-01

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