EP0061529B1 - Buse d'injection de carburant pour moteurs à combustion interne - Google Patents

Buse d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0061529B1
EP0061529B1 EP81109692A EP81109692A EP0061529B1 EP 0061529 B1 EP0061529 B1 EP 0061529B1 EP 81109692 A EP81109692 A EP 81109692A EP 81109692 A EP81109692 A EP 81109692A EP 0061529 B1 EP0061529 B1 EP 0061529B1
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EP
European Patent Office
Prior art keywords
section
gap
restricting
neck
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.)
Expired
Application number
EP81109692A
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German (de)
English (en)
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EP0061529A1 (fr
Inventor
Karl Hofmann
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0061529A1 publication Critical patent/EP0061529A1/fr
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Expired 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
    • F02M61/04—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

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • injection nozzles of this type DE-OS 2 709 892
  • the metering gap for the pre-jet of the fuel at its mouth into the combustion chamber of the machine is directly exposed to the combustion gases, so that it can gradually become clogged by combustion residues. This changes the size of the throttle gap and the metering of the fuel, which adversely affects the engine behavior.
  • a further throttle gap is provided between the conical valve seat and the throttle gap surrounding the cylindrical throttle pin, which is located immediately upstream of the ejection opening and which, alone or together with the throttle gap, at the ejection opening should maintain such high pressure in the fuel jet behind the valve seat that the valve needle is quickly moved into the open position after it has been lifted off the valve seat.
  • the throttle gap surrounding the cylindrical throttle pin and immediately preceding the ejection opening is exposed to the combustion gases, so that it can become clogged by combustion residues.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the metering gap for the fuel pre-jet in the nozzle bore is largely shielded from the attack of the combustion gases by a second throttle gap arranged downstream, the protective gap.
  • the free flow cross-section of the metering gap therefore maintains the prescribed size and shape over a long operating time, so that longer maintenance intervals than previously customary can be provided for such injection nozzles.
  • valve needle and possibly the nozzle bore can be simplified if the pin sections delimiting the restricting gaps and possibly also the wall sections of the nozzle bore delimiting the gaps have the same diameter.
  • the intermediate central section of the nozzle bore is then to be provided with a larger cross section than the sections mentioned.
  • the pin section delimiting the protective gap has a smaller diameter than the pin section delimiting the metering gap and the area of the nozzle bore lying between the columns has the same diameter as the hole area assigned to the metering gap. In this case, there is no central region of the nozzle bore which has an enlarged cross section.
  • the design of the valve needle according to the invention also allows the shape of the pre-jet and, if appropriate, the main jet of the injected fuel to be influenced in the desired manner by appropriate design of the throttle pin.
  • the throttle pin of the pin portion delimiting the protective gap can have a shaping attachment for the spray jet.
  • the section of the nozzle bore lying between the two throttling gaps has a profile in longitudinal section, the geometry of which roughly corresponds to the shape of the throttle pin in the region of the shaping attachment, of the pin portion delimiting the protective gap and its transition corresponds to the pin section with the smaller cross section.
  • FIG. 1 and 2 each show a partial section through one of the exemplary embodiments.
  • valve 1 has a nozzle body 10, in which a valve needle 12 is guided radially and is axially displaceably mounted.
  • a pressure chamber 14 is formed in the nozzle body 10, into which the fuel is introduced and which has a valve seat 16 on the bottom against which a sealing cone 18 of the valve needle 12 is pressed by a closing spring (not shown).
  • the valve seat 16 is followed by a nozzle bore 20, at the mouth of which an ejection opening 22 is formed.
  • a thrust pin 24 engages in the nozzle bore 20 and connects to the sealing cone 18 of the valve needle 12 and is connected to it in one piece.
  • the throttle pin 24 has a first cylindri seen from the sealing cone 18 see pin section 26, which merges conically at a control edge 28 into a pin section 30 with a smaller diameter. This passes over a conical intermediate area into a further cylindrical pin section 32, the diameter of which corresponds approximately to that of the pin section 26.
  • An injection molding neck 34 of the throttle pin is connected to the pin portion 32.
  • the nozzle bore 20 has a first cylindrical wall portion 35, the diameter of which is larger than the diameter of the pin portion 26 by twice the width of a desired annular gap between the pin portion 26 and the nozzle bore.
  • the cylindrical bore section 35 is adjoined by a bore section 36 which initially increases in diameter and then decreases again, which at the ejection opening 22 merges into a cylindrical bore section 38, the diameter of which corresponds to that of the bore section 35.
  • the largest diameter of the central bore section 36 is larger by approximately the difference in diameter between the bore section 35 and the pin section 30 than the pin section 32.
  • the position of the largest diameter of the central bore section 36 is selected such that it is with the valve needle 12 fully raised (right half Fig 1) is located approximately at the height of the pin section 32.
  • the control edge 28 on the pin portion 26 emerges from the bore portion 35 of the nozzle bore, after which the reduced-diameter pin portion 30 releases a larger annular gap between the nozzle bore and the throttle pin, through which the main jet of fuel can pass through virtually unthrottled .
  • its pin section 32 also comes out of the area of the throttle point 42, the cross section of the nozzle bore continuously expanding at this point and the throttling effect being dissolved.
  • the pin portion 32 has entered the area of the largest diameter of the central bore portion 36, so that a through the entire nozzle bore sufficiently large annular gap for unrestricted flow of fuel results.
  • a nozzle bore 44 has a first cylindrical section 46, which merges via a conical section 48 into a second cylindrical section 50 with a smaller diameter.
  • the cylindrical section 46 is formed by a smooth bore in a nozzle body 52, which leads from a pressure chamber 54 in the nozzle body to an end face of the nozzle body.
  • the two other bore sections 48 and 50 of the nozzle bore 44 run in a molding plate 56 which is fastened to the end face of the nozzle body 52, centered by a projection projecting into the bore 46.
  • a throttle pin 58 of a valve needle 60 projects into the nozzle bore 44 and is shaped such that it forms two throttle gaps 62 and 64 in the nozzle bore in the illustrated closed position of the valve needle 60 and delimits them radially inwards.
  • the throttle pin 60 has a first cylindrical section 66 which merges via a conical section 68 into a second cylindrical section 70 of smaller diameter, to which an injection molding pin 72 is attached.
  • the diameter of the cylindrical pin section 66 is smaller than the diameter of the bore section 46 by twice the width of the desired throttle gap 62.
  • the diameter of the pin section 70 is matched to the bore section 50 in the same way.
  • the throttle gap 64 is in front of the throttle gap 62 serving for metering fuel, so that it cannot be impaired by deposits from the combustion gases.
  • the throttle gap 64 contains, so that both the pre-jet and the subsequent main jet of the fuel can spray freely.

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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 (7)

1. Buse d'injection de carburant pour moteurs à combustion interne ayant une aiguille de soupape (12) s'ouvrant dans le sens opposé de l'écoulement du carburant, et sur laquelle est formé un cône d'étanchéité (18) coopérant avec un siège de soupape (16) prévu sur le corps (10) de la buse, suivi d'un goujon d'étranglement (24) qui, en position de fermeture de l'aiguille de soupape (12) pénètre par un segment cylindrique (26) dans un segment cylindre (35) du perçage de buse (20) en aval du siège de soupape (16), et y délimite lors d'une première fraction de course de l'aiguille de soupape (12), une fente de dosage (40) à étranglement pour doser le jet de carburant, caractérisé en ce qu'en aval de la fente de dosage (40), il est prévu sur le goujon d'étranglement (24) et/ou dans le perçage de buse (20), un autre segment cylindrique (32, 38) qui, en position de fermeture de l'aiguille de soupape (12), forme avec le segment de paroi (38, 32) opposé du perçage de buse (20) ou du goujon d'étranglement (24), une fente de protection (42) avec une section d'étranglement dont la longueur en position de fermeture de l'aiguille de soupape (12) est inférieure à la longueur de la fente de dosage (40) formée dans cette position et qui, au début de la course d'ouverture de l'aiguille de soupape (12), s'élargit plus rapidement que la fente de dosage (40) jusqu'à une section n'étranglant pas le jet principal de carburant.
2. Buse d'injection selon la revendication 1, dont le goujon d'étranglement (24) comporte une arête de commande (28) à l'extrémité tournée vers l'ouverture d'éjection du premier segment de goujon (26) délimitant la fente de dosage (40), caractérisé en ce qu'un segment de goujon (30) de section plus faible fait suite à l'arête de commande (28) et à ce segment est raccordé l'autre segment de goujon (32) qui limite la fente de protection (42) et en ce que le perçage de buse (20) présente un segment de perçage élargi (36) par rapport à la fente de protection (42) dans la zone comprise entre la fente de dosage (40) et la fente de protection (42).
3. Buse d'injection selon la revendication 2, caractérisé en ce que les segments de goujon (26, 32) qui délimitent la fente d'étranglement (40) et la fente de protection (42) ont le même diamètre.
4. Buse d'injection selon la revendication 2, caractérisé en ce que le segment de goujon (70) qui délimite la fente de protection (64 figure 2) a un diamètre plus faible que le segment de goujon (66) qui délimite la fente d'étranglement (62) et en ce que la zone du perçage de buse (44) situé entre la fente d'étranglement (62) et l'intervalle de protection (64) présente dans sa section la plus large le même diamètre que celui de la zone de perçage (46) associée à la fente d'étranglement (62).
5. Buse d'injection selon l'une des revendications 2 à 4, caractérisé en ce que le goujon d'étranglement (24) présente en aval du segment de goujon (32) délimitant la fente de protection (42) un prolongement de mise en forme (34) pour le jet à projeter.
6. Buse d'injection selon la revendication 5, caractérisé en ce que le segment (36) du perçage de buse (20) qui se trouve entre la fente d'étranglement (40) et la fente de protection (42) a en coupe longitudinale un profil dont la géométrie correspond sensiblement à la forme du goujon d'étranglement (24) au niveau du prolongement de mise en forme (34) du segment de goujon (32) délimitant la fente de protection (42) et en ce que son passage vers le segment de goujon (30) correspond à la section plus faible.
7. Buse d'injection selon l'une des revendications précédentes, caractérisé en ce que le segment de perçage (50) du perçage de buse (44) qui délimite la fente de protection (64, figure 2) est formé dans une plaque avant (56) fixée au corps de buse (52).
EP81109692A 1981-03-28 1981-11-14 Buse d'injection de carburant pour moteurs à combustion interne Expired EP0061529B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112467 1981-03-28
DE19813112467 DE3112467A1 (de) 1981-03-28 1981-03-28 "kraftstoff-einspritzduese fuer brennkraftmaschinen"

Publications (2)

Publication Number Publication Date
EP0061529A1 EP0061529A1 (fr) 1982-10-06
EP0061529B1 true EP0061529B1 (fr) 1985-06-19

Family

ID=6128671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109692A Expired EP0061529B1 (fr) 1981-03-28 1981-11-14 Buse d'injection de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0061529B1 (fr)
JP (1) JPS57173556A (fr)
DE (2) DE3112467A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143274B (en) * 1983-07-12 1987-12-09 Lucas Ind Plc Fuel injection nozzle
WO2000075989A1 (fr) * 1999-06-03 2000-12-14 Koninklijke Philips Electronics N.V. Dispositif a semi-conducteur comprenant un element de circuit haute tension

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH227665A (de) * 1941-10-08 1943-06-30 Bosch Gmbh Robert Einspritzdüse für Brennkraftmaschinen.
GB562033A (en) * 1942-11-11 1944-06-15 William Reginald Cobb Improvements relating to fuel injectors for internal combustion engines
GB950252A (en) * 1961-02-18 1964-02-26 Bosch Gmbh Robert Improvements in fuel injection valves for internal combustion engines
JPS559837B2 (fr) * 1973-04-26 1980-03-12
DE2710003A1 (de) * 1977-03-08 1978-09-14 Bosch Gmbh Robert Kraftstoffeinspritzduese

Also Published As

Publication number Publication date
DE3171063D1 (en) 1985-07-25
DE3112467A1 (de) 1982-12-30
JPS57173556A (en) 1982-10-25
EP0061529A1 (fr) 1982-10-06

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