EP0244619B1 - Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne - Google Patents

Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne Download PDF

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Publication number
EP0244619B1
EP0244619B1 EP87104392A EP87104392A EP0244619B1 EP 0244619 B1 EP0244619 B1 EP 0244619B1 EP 87104392 A EP87104392 A EP 87104392A EP 87104392 A EP87104392 A EP 87104392A EP 0244619 B1 EP0244619 B1 EP 0244619B1
Authority
EP
European Patent Office
Prior art keywords
ring
contact
nozzle
ceramic
collar
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
EP87104392A
Other languages
German (de)
English (en)
Other versions
EP0244619A1 (fr
Inventor
Bernhard Dipl.-Ing. Kaczynski
Alfred Dr. Schmitt
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 EP0244619A1 publication Critical patent/EP0244619A1/fr
Application granted granted Critical
Publication of EP0244619B1 publication Critical patent/EP0244619B1/fr
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
    • 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
    • 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
    • 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 two two-dimensional contact elements serving to contact the heating element are designed as ring-segment-shaped sheets, both of which are fastened to the ceramic body on the upper end face of the ring collar facing the nozzle body.
  • the spring ring clamped between the nozzle body and the ceramic body is supported on the ceramic body by an insulating disk covering both contact elements, and both contact elements are each electrically conductively connected to the power supply line or the nozzle body via a contact pin penetrating the insulating disk and the central bore of the spring ring.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage of a lower sensitivity to tolerance deviations of the parts, because these are completely absorbed and compensated by the spring washer. It is also achieved that the contacting of the heating element can take place via sufficiently large contact surfaces which can be produced for production, as a result of which local overheating of current-carrying line elements can easily be avoided.
  • the contacting of the first contact element connected to the combustion chamber-side connection of the heating element, which is located on the lower ring side of the collar on the ceramic body, is facilitated if the line element, which connects the first contact element to the power supply line, has a metallic contact washer located under the collar of the ceramic body which has at least one contact tongue which laterally circumferentially surrounds the ring collar.
  • the assembly of the device is facilitated if the ceramic body, the contact ring disk and an annular insulating body arranged underneath, and optionally a pressure ring on the ceramic body, are inserted and fastened in a sleeve, and if the assembly thus formed as a whole is attached to the end of the union nut on the combustion chamber side is attached.
  • the injection nozzle has a nozzle body 10 which is fastened to a nozzle holder (not shown) by a union nut 12.
  • a valve seat is formed in the nozzle body 10 and a valve needle is displaceably mounted, which is loaded in the opening direction by the fuel pressure and in the opposite direction by a closing spring.
  • the injection nozzle is inserted into a bore 14 of a machine housing 16, which merges at an annular shoulder 18 into a narrowed bore section 20 which leads into a combustion chamber.
  • the installation gap is sealed by a sealing ring 22 which bears against an annular shoulder 24 of the union nut 12 and is pressed by the latter against the annular shoulder 18 of the machine housing 16.
  • the nozzle body 10 is followed by an annealing insert, designated as a whole by the reference number 26, which is installed in a stimulating collar 28 of the union nut 12, which begins at the annular shoulder 24 and projects into the narrowed bore section 20.
  • the glow insert 26 has as its central component a sleeve-shaped ceramic body 30, which forms a passage 32 for the spray jets 34 and is provided with an annular flange 36 at the top.
  • the ceramic body 30 serves as a carrier for a printed or otherwise, for. B. applied by vapor deposition, preferably subsequently provided with a glass coating, which in the embodiment consists of a plurality of electrically parallel annular heating conductor surfaces on the inner wall of the ceramic body 30.
  • the heating element 40 can also be designed differently than shown in adaptation to the respective application, for. B. as a helically rising heating conductor surface with the same or different surface width.
  • the heating element 40 has as the first connection a conductor track 42 attached to the outer jacket of the ceramic body 30, which is connected to a contact covering 44 covering the lower ring surface of the ring collar 36.
  • the other connection of the heating element 40 is designed as a conductor track 46 which extends on the inner wall of the ceramic body 30 and is connected to a contact area 48 covering the upper annular surface of the annular collar 36 over the entire circumference.
  • a plurality of bores 50 are also provided below the ring flange 36, through which the spray jets 34, as a result of the injector effect, air from the Suction the combustion chamber.
  • the front collar 28 of the union nut 12 has an inwardly directed annular shoulder 52 on which a metallic mounting sleeve 54 is seated, which is connected to the union nut 12 via an annular weld seam 56.
  • the mounting sleeve 54 modeled on the inner contour of the ring collar 28 carries an electrically insulating ceramic ring 58, on the upper end face of which a metallic contact ring disk 60 is seated, on which the ceramic body 30 rests with its contact coating 44.
  • the contact ring disk 60 has a laterally projecting and upwardly angled contact tongue 62 which passes through a local recess 64 in the mounting sleeve 54 and is connected to a power supply line 66 which is insulated through the injection nozzle.
  • a metallic pressure ring 68 on which the middle ring area of a spring ring 70 is supported, the inner ring edge of which resiliently presses against the flat end face of the nozzle body 10 and the outer ring edge of which rests on a conical wall surface of the nozzle body 10 centered.
  • the ceramic ring 58, the contact ring disk 60, the ceramic body 30 already provided with the heating element 40 and its connecting elements 42 to 48, and the pressure ring 68 are first inserted into the mounting sleeve 54 in the order described and then firmly connected to the latter, e.g. B. by a soldering process. Then this group of parts forms the glow insert 26, which is inserted as a whole into the union nut 12 from its upper end face, advanced to the annular shoulder 52 and then welded to the union nut 12.
  • the spring 70 and the nozzle body 10 can be inserted into the union nut 12 and clamped by this to the nozzle holder, as a result of which the spring ring 70 is braced in the desired manner and seals the annular gap between the nozzle body 10 and union nut 12 to the passage 32 and to the combustion chamber.

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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 (4)

1. Dispositif d'injection de combustible dans des chambres de combustion de moteurs à combustion, avec un injecteur et un corps à incandescence placé en aval, présentant un corps en céramique (30) en forme de douille qui forme un passage (32) pour le jet d'injection de carburant (34) et porte un élément de contact électrique (40), dont les deux raccordements (42, 46) sont reliés à des éléments de contact (44, 48) plats disposés sur une collerette annulaire (36) du corps en céramique (30) et parmi lesquels l'un est mis en contact avec le corps d'injecteur (10) de l'injecteur et l'autre avec une alimentation de courant (66) isolée par rapport à l'injecteur, et en outre avec une douille élastique (70) serrée entre le corps d'injecteur (10) et la collerette annulaire (36) du corps en céramique (30), isolant de manière étanche l'interstice annulaire situé entre ces parties, caractérisé en ce que le premier élément de contact (44) relié à un raccordement (42) de l'élément chauffant (40) est disposé sur le corps en céramique (30), du côté opposé annulaire inférieur de la collerette annulaire opposé au corps d'injecteur (10) et relié à l'alimentation de courant (66) par un élément conducteur (60, 62) entourant de manière isolée le deuxième élément de contact (48) relié à l'autre raccordement (46) de l'élément chauffant (40), deuxième élément de contact disposé de manière connue sur le corps en céramique (30), sur le côté frontal supérieur de la collerette annulaire (36) tourné vers le corps d'injecteur (10) et mis en contact par la rondelle élastique (70) avec le corps d'injecteur (10).
2. Dispositif selon la revendication 1, caractérisé en ce que l'élément conducteur (60, 62) reliant le premier élément de contact (44) à l'alimentation en courant (66) présente un disque de contact annulaire (60) métallique situé sous la collerette annulaire (36) du corps en céramique (30), possédant au moins une languette de contact (62) entourant latéralement la collerette annulaire (36).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'un anneau de pression (68) métallique appuyant sur le deuxième élément de contact (48) est disposé entre le corps en cérami- . que (30) et la rondelle élastique (70).
4. Dispositif selon la revendication 2 ou 3, avec un injecteur, dont le corps d'injecteur est fixé sur un porte-injecteur par un écrou d'accouplement, caractérisé en ce que le corps en céramique (30), de disque annulaire de contact (60) et un corps isolant (58) de forme annulaire disposé au-dessous, ainsi que le cas échéant l'anneau de pression (68) sont introduits dans une douille (54) et y sont fixés, et en ce que l'unité structurelle (26) ainsi formée est fixée comme un tout sur l'extrémité frontale (28) de l'écrou d'accouplement (12) qui est située côté chambre de combustion.
EP87104392A 1986-04-26 1987-03-25 Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne Expired EP0244619B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863614226 DE3614226A1 (de) 1986-04-26 1986-04-26 Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
DE3614226 1986-04-26

Publications (2)

Publication Number Publication Date
EP0244619A1 EP0244619A1 (fr) 1987-11-11
EP0244619B1 true EP0244619B1 (fr) 1989-06-28

Family

ID=6299628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104392A Expired EP0244619B1 (fr) 1986-04-26 1987-03-25 Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0244619B1 (fr)
JP (1) JP2513677B2 (fr)
DE (2) DE3614226A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6543333B2 (en) 2001-06-01 2003-04-08 Visteon Global Technologies, Inc. Enriched cobalt-tin swashplate coating alloy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3464660D1 (en) * 1983-06-23 1987-08-13 Allied Corp An improved glow plug having a resistive surface film heater
DE3414201A1 (de) * 1984-04-14 1985-10-17 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeumen

Also Published As

Publication number Publication date
JPS62261666A (ja) 1987-11-13
DE3614226A1 (de) 1987-10-29
DE3760281D1 (en) 1989-08-03
JP2513677B2 (ja) 1996-07-03
EP0244619A1 (fr) 1987-11-11

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