EP0404407B1 - Kraftstoffeinspritzdüse - Google Patents

Kraftstoffeinspritzdüse Download PDF

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Publication number
EP0404407B1
EP0404407B1 EP90306280A EP90306280A EP0404407B1 EP 0404407 B1 EP0404407 B1 EP 0404407B1 EP 90306280 A EP90306280 A EP 90306280A EP 90306280 A EP90306280 A EP 90306280A EP 0404407 B1 EP0404407 B1 EP 0404407B1
Authority
EP
European Patent Office
Prior art keywords
seating
bore
sac volume
valve member
orifices
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.)
Expired - Lifetime
Application number
EP90306280A
Other languages
English (en)
French (fr)
Other versions
EP0404407A1 (de
Inventor
Martin Paul Hardy
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 EP0404407A1 publication Critical patent/EP0404407A1/de
Application granted granted Critical
Publication of EP0404407B1 publication Critical patent/EP0404407B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • This invention relates to a method of making a fuel injection nozzle of the kind comprising a nozzle body defining a blind bore, a frusto conical seating at the blind end of the bore, the seating leading into a cylindrical sac volume from which extends an outlet orifice or orifices and a valve member slidable in the bore and having a conical tip shaped for engagement with the seating to prevent flow of fuel through the outlet orifice or orifices.
  • a fuel injection nozzle is known from EP-A-0 283 154.
  • the valve member tends to rotate in the bore and if the surfaces of the valve member were concentric this would not matter.
  • the tip of the valve member is sometimes eccentric to a very small degree and even though the valve member is able to establish a fuel tight seal with the seating in the closed position of the valve member, in the partly open position it is found that the degree of restriction to the flow of fuel can vary as the angular position of the valve member changes in the use of the nozzle.
  • the object of the invention is to provide a fuel injection nozzle of the kind specified and a method of making same in a simple and convenient form.
  • a method of making a fuel injection nozzle of the kind specified comprises machining the bore and sac volume prior to hardening the nozzle body, and following hardening, grinding a portion of the bore, the seating and at least the wall of the entrance to the sac volume so that the wall of the entrance portion is concentric with the seating.
  • a fuel injection nozzle of the kind specified at least the entrance portion of the sac volume is of enlarged diameter and is concentric with the seating.
  • FIG. 1 of the drawings there is shown a portion of the nozzle body 10 in which is formed a blind bore 11 at the blind end of which is formed a frusto conical seating 12 leading into a sac volume 13 having a cylindrical wall 14. Extending from the sac volume 13 are outlet orifices 15.
  • valve member 16 Slidable in the bore is a valve member 16 the portion of which is illustrated is narrower in diameter than the bore to provide an annular space 17 which is connected to a fuel inlet of the nozzle, the inlet in use being connected to the outlet of a fuel injection pump.
  • the valve member has a conical tip 18 having a cone angle which is slightly larger than that of the seating 12.
  • a frusto conical portion 19 Intermediate the tip 18 and the cylindrical portion of the valve member is a frusto conical portion 19 having a cone angle which is smaller than that of the seating.
  • valve member is biased into contact with the seating by a spring (not shown) and is lifted in known manner away from the seating by the fuel under pressure supplied to the aforesaid inlet.
  • the nozzle body is formed from hardenable steel and while the body is in its soft state the bore 11, the seating 12 and the sac volume 13 are rough machined. In addition the outlet orifices 15 are also drilled. The body is then hardened a process which involves the use of heat and after hardening the portion of the bore which forms a bearing surface for the valve member and also the seating are ground so that they are concentric. The valve member is machined and ground to size and is assembled into the bore.
  • the eccentricities noted above can have an effect upon the operating characteristics of the nozzle. This is because, in use, the valve member tends to rotate in the bore. If therefore the valve member is lifted by a predetermined amount from the seating the degree of restriction to the flow of fuel between the tip of the valve member and the portion of the seating adjacent the sac volume, can vary depending on the angular position of the valve member.
  • FIG 3 in which the eccentricity is exaggerated, shows the modification to the nozzle to minimise the above problem.
  • the entrance portion 14A of the wall of the sac volume adjacent the seat has been machined after hardening of the nozzle body, so that it is concentric with the seating and the ground portion of the bore 11.
  • the transition between the seating 12 and the sac volume lies in a plane normal to the axis of the ground portion of the bore and the seating.
  • the restriction to the flow of fuel between the tip 18 of the valve member and the seating 12 will remain substantially constant irrespective of the angular position of the valve member.
  • the formation of the entrance portion 14B can be achieved using a shaped hone secured to a mandrel guided by the ground portion of the bore.

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  • 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. Verfahren zum Herstellen einer Kraftstoffeinspritzdüse des Typs, welcher einen Düsenkörper (10) umfaßt, der eine Sackbohrung (11) definiert sowie am geschlossenen Ende der Bohrung einen kegelstumpfförmigen Sitz (12), wobei der Sitz in ein sackförmiges Volumen (13) führt, von dem ein oder mehrere Auslaßöffnungen (15) ausgehen, und welcher ferner umfaßt ein Ventilelement (16), welches in der Bohrung (11) gleitverschieblich ist und eine Spitze (18) aufweist, die zum Eingriff mit dem Sitz ausgebildet ist, um das Fließen von Kraftstoff durch die ein oder mehreren Auslaßöffnungen (15) zu verhindern, wobei das Verfahren durch die in der folgenden Reihenfolge durchzuführenden Schritte gekennzeichnet ist: die Bohrung (11) und das sackförmige Volumen (13) werden maschinell bearbeitet,
    der Düsenkörper (10) wird gehärtet und ein Teil der Bohrung (11), der Sitz (12) und zumindest die Wand des Einlaßbereichs (14A, 14B) des sackförmigen Volumens werden geschliffen, derart, daß die Wand des Einlaßbereichs konzentrisch zu dem Sitz (12) ist.
  2. Verfahren nach Anspruch 1, bei dem das Verfahren ferner den Schritt der Verwendung des geschliffenen Teils der Bohrung (11) als Führung für einen Dorn umfaßt, der ein geformtes Honelement trägt, welches den Einlaßbereich (14B) zu dem sackförmigen Volumen formt.
  3. Kraftstoffeinspritzdüse, welche nach dem Verfahren gemäß Anspruch 1 hergestellt ist, umfassend:
    einen Düsenkörper (10), welcher eine Sackbohrung (11) definiert, einen kegelstumpfförmigen Sitz (12) am geschlossenen Ende der Bohrung, wobei der Sitz in ein zylindrisches sackförmiges Volumen (13) führt, von dem ein oderer merhere Auslaßöffnungen (15) ausgehen, sowie ein Ventilelement (16), welches in der Bohrung (12) gleitverschieblich ist und eine konische Spitze (18) aufweist, welche zum Eingriff mit dem Sitz geformt ist, um das Fließen von Kraftstoff durch die ein oder mehreren Auslaßöffnungen zu verhindern, wobei die konische Spitze (18) mit dem Sitz (12), wenn das Ventilelement teilweise von dem Sitz abgehoben ist, eine Drosselstelle für den Kraftstofffluß durch die ein oder mehreren Auslaßöffnungen (15) bildet,
    dadurch gekennzeichnet, daß zumindest die Wand des Einlaßbereichs (14A, 14B) des sackförmigen Volumens einen vergrößerten Durchmesser aufweist und konzentrisch zu dem Sitz (12) ist.
  4. Kraftstoffeinspritzdüse nach Anspruch 3, dadurch gekennzeichnet, daß der Einlaßbereich (14A) von zylindrischer Form und von einem größeren Durchmesser ist als der übrige Teil des sackförmigen Volumens.
  5. Kraftstoffeinspritzdüse nach Anspruch 3, dadurch gekennzeichnet, daß der Einlaßbereich (14B) von kegelstumpfförmiger Form ist und einen Konuswinkel aufweist, welcher kleiner ist als der Konuswinkel des Sitzes (12).
EP90306280A 1989-06-23 1990-06-08 Kraftstoffeinspritzdüse Expired - Lifetime EP0404407B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8914478 1989-06-23
GB898914478A GB8914478D0 (en) 1989-06-23 1989-06-23 Fuel injection nozzle

Publications (2)

Publication Number Publication Date
EP0404407A1 EP0404407A1 (de) 1990-12-27
EP0404407B1 true EP0404407B1 (de) 1992-12-16

Family

ID=10658963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90306280A Expired - Lifetime EP0404407B1 (de) 1989-06-23 1990-06-08 Kraftstoffeinspritzdüse

Country Status (4)

Country Link
EP (1) EP0404407B1 (de)
DE (1) DE69000591T2 (de)
ES (1) ES2037524T3 (de)
GB (1) GB8914478D0 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547423B4 (de) * 1995-12-19 2008-09-18 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE59907093D1 (de) * 1998-08-27 2003-10-30 Waertsilae Nsd Schweiz Ag Verfahren zum Herstellen einer Brennstoffeinspritzdüse und Brennstoffeinspritzdüse
DE19841192A1 (de) * 1998-09-09 2000-03-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1712776B1 (de) * 2005-04-14 2008-07-02 Siemens Aktiengesellschaft Ventilkörper und Flüssigkeitsinjektor mit Ventilkörper
DE102008039920A1 (de) * 2008-08-27 2010-03-04 Continental Automotive Gmbh Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
AT511880B1 (de) * 2011-09-06 2013-12-15 Bosch Gmbh Robert Verschleissoptimierte herstellung von konischen spritzlöchern
AT512893B1 (de) 2013-02-05 2013-12-15 Bosch Gmbh Robert Bauelement mit ineinandermündenden Hochdruckbohrungen
GB2545195A (en) * 2015-12-08 2017-06-14 Delphi Int Operations Luxembourg Sarl Fuel injection nozzle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283154A1 (de) * 1987-03-14 1988-09-21 LUCAS INDUSTRIES public limited company Brennstoffeinspritzdüse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR821149A (fr) * 1937-04-27 1937-11-27 Moteur à combustion interne
GB562033A (en) * 1942-11-11 1944-06-15 William Reginald Cobb Improvements relating to fuel injectors for internal combustion engines
US2927737A (en) * 1952-04-12 1960-03-08 Bosch Gmbh Robert Fuel injection valves
JPS60118462A (ja) * 1983-11-30 1985-06-25 Keihin Seiki Mfg Co Ltd 燃料噴射弁における弁座形成体の加工方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283154A1 (de) * 1987-03-14 1988-09-21 LUCAS INDUSTRIES public limited company Brennstoffeinspritzdüse

Also Published As

Publication number Publication date
DE69000591T2 (de) 1993-07-01
ES2037524T3 (es) 1993-06-16
DE69000591D1 (de) 1993-01-28
EP0404407A1 (de) 1990-12-27
GB8914478D0 (en) 1989-08-09

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