EP0266361A1 - Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion. - Google Patents

Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion.

Info

Publication number
EP0266361A1
EP0266361A1 EP87900646A EP87900646A EP0266361A1 EP 0266361 A1 EP0266361 A1 EP 0266361A1 EP 87900646 A EP87900646 A EP 87900646A EP 87900646 A EP87900646 A EP 87900646A EP 0266361 A1 EP0266361 A1 EP 0266361A1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
incandescent body
incandescent
flat strip
injection nozzle
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.)
Granted
Application number
EP87900646A
Other languages
German (de)
English (en)
Other versions
EP0266361B1 (fr
Inventor
Bernhard Kaczynski
Iwan Komaroff
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 EP0266361A1 publication Critical patent/EP0266361A1/fr
Application granted granted Critical
Publication of EP0266361B1 publication Critical patent/EP0266361B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

  • the invention relates to a device for injecting fuel according to the preamble of the main claim.
  • the cross section of the annular space surrounding the incandescent body increases toward the injection nozzle, as a result of which the overall flow conditions for the intake air are improved.
  • the incandescent body has a constant wall thickness over the entire length, its inner passage also adapts better to the shape of the spray jet, which also increases the injector effect of the spray jets passing through the incandescent body.
  • the incandescent body is wound from a round wire, the contacting of which requires increased effort due to the lack of flat contact surfaces on the round wire.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that reliable contacting and holding the glow with relatively little effort body is possible.
  • special materials that are only available as flat material in the form of sheets and strips can also be used as the material for the incandescent body. If the interstices of the turns are of the same size and therefore the admixture of sucked-in air is equally good in the edge zones of the spray jets passing through the incandescent body, the moment of resistance to flow influences is increased in comparison to heating coils made of round wire.
  • the filament can be produced inexpensively from commercially available sheets or strips.
  • the shape of the flat strip forming the incandescent body can be adhered to extremely precisely if the flat strip is a laser-cut or an etched molded part.
  • a particularly reliable contacting of the incandescent body can be achieved if a closed contact ring is molded onto the ends of the flat strip forming the incandescent body.
  • the contact rings can advantageously simultaneously serve for centering and for holding the incandescent body to a carrier, which can be designed, for example, as a sleeve supported on the nozzle clamping nut and surrounding the incandescent body with radial play.
  • FIG. 1 shows an enlarged longitudinal section through the end of an injection nozzle on the combustion chamber side and an glow insert integrated into its union nut
  • FIG. 2 shows a plan view of the glow plug of the glow insert according to FIG. 1 in an intermediate stage of production. Description of the embodiment
  • the device has an injection nozzle with a nozzle body 10, in which, as is known, a valve seat is formed and a valve needle is displaceably mounted.
  • the nozzle body 10 and an intermediate disk limiting the stroke of the valve needle are clamped by a union nut 12 to a nozzle holder in which, among other things, a closing spring pressing the valve needle against the valve seat is accommodated.
  • the nozzle body 10 is provided with a conical wall section 14 which merges into a flat end wall 16.
  • the union nut 12 is extended on the combustion chamber side beyond the nozzle holder 10 and is provided downstream of its end wall 16 with an inner support shoulder 18 against which an annealing insert, designated as a whole by the reference number 20, bears.
  • this has a filament 22 designed as a filament, which forms a passage 24 for the spray jets 26.
  • the incandescent body 22 is dimensioned such that the spray jets do not wet the incandescent body, but do produce an injector effect, through which air is sucked out of the combustion chamber into the interior of the incandescent body 22 and the peripheral zones of the spray jets passing through the incandescent body.
  • the incandescent body 22 is surrounded by a metallic sleeve 30 which has a flange 32 which rests on the support shoulder 18 of the union nut 12.
  • the sleeve 30 is provided with an inwardly directed annular collar 34, on which the end turn 35 of the incandescent body 22 on the combustion chamber side is supported and, for example, soldered.
  • the union nut 12 Downstream of the support shoulder 18, the union nut 12 has an enlarged bore section 36 in an annular collar 38, which surrounds the end of the sleeve 30 and the incandescent body 22 on the combustion chamber in a protective manner.
  • the sleeve 30 is evenly ver with several shared holes 40 provided in the jacket wall, which open into the enlarged bore section 36 of the union nut 12.
  • a first annular insulating body 44, a metallic contact washer 46, a second annular insulating body 48 and a metallic supporting washer 50 are superimposed on the sleeve 30. These parts are firmly connected to each other and to the sleeve 30, e.g. centered against each other by soldering, and without further aids, only by correspondingly forming a joining tool when connecting.
  • the upstream end of the incandescent body 22 is soldered to an inner ring zone 52 of the contact ring disk 46, which is provided with a plurality of uniformly distributed openings 54 in the central ring area.
  • the contact ring disk 46 is provided with three raised contact lugs 56 which are offset by 120 ° to one another and are conductively connected to a power supply sleeve 58 which is insulated through the annular gap between the nozzle body 10 and the union nut 12 up to a higher connection point of an outer supply line extends.
  • a deformed metallic heat protection ring 60 is clamped between the support disk 50 and the nozzle body 10 and presses with an inner ring edge 62 against the end wall 16 of the nozzle body 10.
  • a central ring region 64 of the heat protection ring 60 which is offset axially to the inner ring edge 62, bears against the support disk 50 and an outer ring edge 66 bears against the conical wall section 14 of the nozzle body 10.
  • the heat protection ring 60 is centered on the nozzle body 10 and the passage 24 is properly sealed against the chamber 68 surrounding the heat protection ring 60.
  • annular space 70 is formed, which communicates with the combustion chamber via the holes 40 in the sleeve 30 and the enlarged bore section 36 of the union nut 12 connected is.
  • the spray jets 26 suck in air from the combustion chamber by the action of an injector, which, heated on the incandescent body (22), reaches the peripheral zones of the spray jets and forms an easily flammable fuel-air mixture there.
  • the air entry into the spray jets is made uniform over the entire length of the incandescent body 22 and the insulating bodies 44, 48 or their connection points with the adjacent metallic parts are thermally relieved.
  • the conical design also improves the dynamic behavior of the filament and reduces the risk of breakage.
  • the prefabricated structural unit formed from the parts 22, 30 and 44 to 50 is inserted into the union nut 12 from the upstream side thereof and advanced until it abuts the support shoulder 18.
  • the sleeve 30 can then be glued or soldered or welded to the union nut 12 at a suitable point.
  • the injection nozzle is then expediently installed in such a way that the nozzle holder, the intermediate disk and the nozzle body 10 are placed on top of one another in reverse, the heat protection ring 60 is placed on the nozzle body 10 and then the union nut 12 together with the glow insert 20 is put on the parts and screwed onto the nozzle holder, whereby the tensing heat protection ring 60 is kept centered on the nozzle holder 10.
  • the incandescent body 22 is wound from a flat strip 72 (FIG. 2), so that the individual turns have a rectangular cross section.
  • the flat strip 72 is cut out in the form of a spiral from a flat sheet metal body and then pulled apart in the axial direction of the incandescent body 22 to form a conical coil.
  • the spiral can be separated from the flat sheet metal body, for example by etching or also, as shown in Figure 2, done by laser cutting.
  • the flat output part is a sheet metal strip 74, from which the spiral flat strip 72 is separated by a cutting line 76, which begins at 78 and ends at 80.
  • an inner circular cutting line 82 and an outer circular cutting line 84 are provided, by means of which the spiral is separated from the sheet metal strip 74.
  • the incandescent body 22 receives at its ends an inner closed contact ring 86 and an outer closed contact ring 88, with which the incandescent body 22 is contacted on the contact ring disk 46 and the sleeve 30.
  • the described design of the incandescent body 22 results in flat contact surfaces between the parts to be contacted, which also extend over an entire circumference and therefore allow excellent contacting and fastening.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Spark Plugs (AREA)
  • Laser Beam Processing (AREA)

Abstract

Le dispositif comprend un organe incandescent (22) disposé en aval de la buse d'injection et ayant la forme d'une hélice s'ouvrant coniquement vers la chambre de combustion. L'hélice est constituée d'une bande plate (72) découpée en forme de spirale dans une tôle plate (74) par laser ou à l'acide; ensuite elle est étirée axialement. Cette construction facilite la mise en contact du corps incandescent (22) et présente l'avantage de pouvoir fabriquer l'hélice à partir de matériaux disponibles uniquement en plaques ou bandes planes.
EP19870900646 1986-05-09 1987-01-14 Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion Expired - Lifetime EP0266361B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863615634 DE3615634A1 (de) 1986-05-09 1986-05-09 Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3615634 1986-05-09

Publications (2)

Publication Number Publication Date
EP0266361A1 true EP0266361A1 (fr) 1988-05-11
EP0266361B1 EP0266361B1 (fr) 1991-12-18

Family

ID=6300453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900646 Expired - Lifetime EP0266361B1 (fr) 1986-05-09 1987-01-14 Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion

Country Status (5)

Country Link
US (1) US4788953A (fr)
EP (1) EP0266361B1 (fr)
JP (1) JPS63503315A (fr)
DE (2) DE3615634A1 (fr)
WO (1) WO1987006977A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609749A1 (de) * 1986-03-22 1987-09-24 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
US6616066B2 (en) * 2000-01-29 2003-09-09 Daimlerchrysler Ag Injection valve

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1456018A (en) * 1920-07-02 1923-05-22 Edwin L Wiegand Internal-combustion engine
GB274560A (en) * 1926-04-21 1927-07-21 Sydney Charles Lloyd Improvements relating to electrical resistances
US2066860A (en) * 1934-07-02 1937-01-05 Shumake Alton Pump and injector nozzle for diesel engines
DE650676C (de) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Bandheizkoerper fuer elektrische Widerstandsoefen
FR1382697A (fr) * 1964-02-17 1964-12-18 Dispositif d'injection et d'allumage pour moteurs à combustion
JPS5874868A (ja) * 1981-10-29 1983-05-06 Nissan Motor Co Ltd 直接噴射式デイ−ゼルエンジン
DE3307109A1 (de) * 1982-08-14 1984-03-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume von insbesondere selbstzuendenen brennkraftmaschinen
GB2131539B (en) * 1982-12-02 1986-04-16 Lucas Ind Plc Electric starting aids for internal combustion engines
DE3307666A1 (de) * 1983-03-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume, insbesondere in brennkammern von dieselmotoren
DE3315241A1 (de) * 1983-04-27 1984-10-31 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in eine sekundaere stroemung von verbrennungsluft einer brennkammer
DE3327773A1 (de) * 1983-05-13 1984-11-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur kraftstoffeinspritzung in brennraeume
DE3414201A1 (de) * 1984-04-14 1985-10-17 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeumen
DE3502112A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3502110A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3615636A1 (de) * 1986-05-09 1987-11-12 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8706977A1 *

Also Published As

Publication number Publication date
US4788953A (en) 1988-12-06
DE3775345D1 (de) 1992-01-30
EP0266361B1 (fr) 1991-12-18
DE3615634A1 (de) 1987-11-12
WO1987006977A1 (fr) 1987-11-19
JPS63503315A (ja) 1988-12-02

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