EP0548066B1 - Injecteur de carburant pour moteurs a combustion interne - Google Patents

Injecteur de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP0548066B1
EP0548066B1 EP89911533A EP89911533A EP0548066B1 EP 0548066 B1 EP0548066 B1 EP 0548066B1 EP 89911533 A EP89911533 A EP 89911533A EP 89911533 A EP89911533 A EP 89911533A EP 0548066 B1 EP0548066 B1 EP 0548066B1
Authority
EP
European Patent Office
Prior art keywords
hole
diameter
filter
fuel channel
connecting hole
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
EP89911533A
Other languages
German (de)
English (en)
Other versions
EP0548066A1 (fr
Inventor
Karl Hofmann
Horst Wellein
Helmut Fleischmann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0548066A1 publication Critical patent/EP0548066A1/fr
Application granted granted Critical
Publication of EP0548066B1 publication Critical patent/EP0548066B1/fr
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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • a fuel injector of this type known, for example, from US-A 3 777 986 and DE-A-23 03 506, the relatively wide filter bore extends over a diameter that is offset Connection hole in the fuel channel. These interconnected holes have an obtuse-angled bottom. The transitions formed in this way have a sharp change in cross-section, which has an adverse effect on the flow.
  • a fuel injection nozzle in which the fuel channel connects directly to the filter bore, which has a W-shaped borehole bottom (FIGS. 1 and 2).
  • a sharp-edged edge is formed, which must be removed electrolytically in an additional operation due to its susceptibility to fatigue failure.
  • the transition area of the filter bore in the fuel channel due to the small distance of the fuel channel from the circumference of the nozzle holder, there is a point with a further reduced wall thickness, which affects the pressure threshold strength.
  • the invention is based, to find a solution to the problems of the known fuel injection nozzles the task.
  • the solution to this problem is specified in the characterizing part of claim 1.
  • the fuel injection nozzle according to the invention has the advantage that simplified manufacture of the nozzle holder in the area of the filter bore and the transition thereof into the fuel channel is achieved without additional effort.
  • the nozzle holder of the fuel injection nozzle has an improved strength in this area, so that the injection nozzle can also be designed for significantly higher fuel pressures above 800 bar.
  • FIG. 1 shows an injection nozzle of the generic type, partly in longitudinal section and partly in side view
  • FIG. 2 shows the area "Z" in FIG. 1, on an enlarged scale compared to FIG. 1
  • FIG. 3 shows a partial section through the exemplary embodiment of the invention in one of FIG. 2 appropriate scale.
  • the generic injection nozzle according to FIG. 1 has a nozzle body 10 which, together with an intermediate disk 12, is fastened to a nozzle holder 16 by means of a clamping nut 14.
  • the intermediate disc 12 serves as a stroke stop for a valve needle 18, which is pressed by a closing spring via a pressure piece against a valve seat in the nozzle body 10.
  • the closing spring 20 is in a chamber 22 arranged in the nozzle holder 16 and is supported on the bottom 24 of the chamber 22.
  • the chamber 22 is connected via a leakage oil channel 26 to a leakage oil connection on the nozzle holder 16, which is not visible in the drawing.
  • a pressure chamber which is not visible and surrounds the valve needle 18, is formed, in which the valve needle 18 has a pressure shoulder and which is connected via holes 28 and 30 in the nozzle body 10 and the intermediate disk 12 to a fuel channel 32 in the nozzle holder 16, which is located next to the chamber 22 and parallel to it through the nozzle holder 16 through to a larger diameter filter bore 34 which contains a rod-shaped filter body 36 and aligned obliquely to the nozzle axis in a connecting piece 38 for a fuel supply line.
  • the filter bore 34 is produced with the aid of a deep hole drill, the only cutting lip of which, in the full material, produces a W-shaped cutting profile, which is shown in more detail in FIG.
  • the sectional profile has two inner W-legs 40, to which two outer W-legs 42 connect.
  • the transition between the outer W-legs 42 and the bore wall 44 of the filter bore 34 can have further inclined sections 46 and 48 by means of corresponding cuts on the deep hole drill.
  • a connecting bore 52 is provided between the filter bore 34 and the fuel channel 32 and is arranged coaxially with the filter bore 34, the diameter of which is smaller than the diameter of the filter bore 34 and larger than the diameter of the fuel channel 32.
  • the connecting bore 52 is also made with a deep hole drill and consequently also has a W-shaped sectional profile with two external W-legs 56.
  • the diameter of the connecting bore 52 or the sectional profile is so matched to the diameter of the fuel channel 32 that its channel wall 58 that Sectional profile of the connecting bore 52 cuts only in the area of the outer W-legs 56.
  • the inner W-legs are omitted and the edge 60 forming at the transition between the two bores has an edge angle of over 90 ° over its entire circumference, so that a risk of fatigue fracture is significantly reduced and an additional operation for post-treatment of the edge is eliminated.
  • the diameter of the connecting bore 52 is also dimensioned such that its bore wall 62 also cuts the filter bore 34 only in the area of the outer W-leg 42 of its sectional profile, so that there is also no post-treatment of the resulting edge edge 64 there.
  • Another advantage of the arrangement according to the invention is that the smallest wall thickness s resulting in the transition region of the bores is greater than in the prior art, which also gives the injector a higher pressure threshold strength.
  • connection bore 52 could also be produced together with the filter bore 34 by a correspondingly shaped deep hole drill in one operation.

Abstract

Des injecteurs de ce type présentent un épaulement (50) anguleux néfaste au niveau de la transition entre l'alésage de filtre (34) et le canal de carburant (32), ce qui peut provoquer une rupture par fatigue et doit être éliminé par voie électrolytique au cours d'une opération supplémentaire. L'invention rend superflue cette opération supplémentaire de finition techniquement compliquée. A cet effet, un alésage de raccordement (52) est percé entre l'alésage de filtre (34) et le canal de carburant (32) à l'aide d'un foret long, et adapté au diamètre du canal de carburant (32) de sorte que la paroi (58) du canal coupe le profil de section de l'alésage de raccordement (52) uniquement dans la région du côté externe du W (56). Domaine d'application préféré: moteurs diesel.

Claims (2)

  1. Injecteur de carburant pour moteurs à combustion interne comportant un support d'injecteur (16) avec une chambre (22) pour recevoir un ressort obturateur (20) et à une extrémité, un embout de raccordement (38) pour la conduite d'alimentation de carburant, à partir duquel part un perçage de filtre (34) en biais par rapport à l'axe de l'injecteur réalisé par un procédé de perçage profond et recevant un corps de filtre (36) pour conduire à un canal de carburant (32) qui traverse le support d'injecteur, longitudinalement à côté de la chambre qui a un diamètre plus faible que le perçage de filtre, un perçage de liaison (52, figure 3) réalisé par le procédé de perçage profond et qui est coaxial au perçage de filtre (34) étant réalisé entre le perçage de filtre (34) et le canal de carburant (32), le diamètre de ce perçage de liaison étant inférieur au diamètre du perçage de filtre (34) et supérieur au diamètre du canal de carburant (32), injecteur caractérisé en ce que le fond du perçage de filtre (34) et le fond du perçage de liaison (52) ont chaque fois un profil de coupe en forme de W et le diamètre ou le profil de coupe du perçage de liaison (52) est accordé sur le diamètre du canal de carburant (32) pour que sa paroi de canal (58) attaque le profil de coupe du perçage de liaison (52) uniquement au niveau des branches extérieures (56) de la forme de W.
  2. Injecteur selon la revendication 1, caractérisé en ce que le diamètre du perçage de liaison (52) est dimensionné pour que sa paroi de perçage (62) attaque le profil de coupe du perçage de filtre (34) uniquement au niveau des branches extérieures (42) de la forme en W.
EP89911533A 1988-11-24 1989-10-19 Injecteur de carburant pour moteurs a combustion interne Expired - Lifetime EP0548066B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3839635A DE3839635A1 (de) 1988-11-24 1988-11-24 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3839635 1988-11-24
PCT/DE1989/000666 WO1990005846A1 (fr) 1988-11-24 1989-10-19 Injecteur de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0548066A1 EP0548066A1 (fr) 1993-06-30
EP0548066B1 true EP0548066B1 (fr) 1994-05-11

Family

ID=6367782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911533A Expired - Lifetime EP0548066B1 (fr) 1988-11-24 1989-10-19 Injecteur de carburant pour moteurs a combustion interne

Country Status (4)

Country Link
EP (1) EP0548066B1 (fr)
JP (1) JP2779029B2 (fr)
DE (2) DE3839635A1 (fr)
WO (1) WO1990005846A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808611A1 (de) * 1998-02-28 1999-09-02 Bosch Gmbh Robert Verfahren zum Herstellen einer abgewinkelten Bohrung in einem Bauteil
DE10017657A1 (de) * 2000-04-08 2001-10-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP2010196544A (ja) * 2009-02-24 2010-09-09 Yanmar Co Ltd 燃料噴射ノズル

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2119973A1 (de) * 1971-04-23 1972-11-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzdüse
DE2303506A1 (de) * 1973-01-25 1974-08-01 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3205669A1 (de) * 1982-02-17 1982-12-30 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzventil fuer dieselmotoren
DE8213190U1 (de) * 1982-05-07 1983-10-27 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
WO1990005846A1 (fr) 1990-05-31
DE3839635A1 (de) 1990-05-31
JPH04501900A (ja) 1992-04-02
JP2779029B2 (ja) 1998-07-23
DE58907659D1 (de) 1994-06-16
EP0548066A1 (fr) 1993-06-30

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