EP0294586B1 - Buse d'injection de combustible pour moteurs à combustion interne - Google Patents

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

Info

Publication number
EP0294586B1
EP0294586B1 EP19880107193 EP88107193A EP0294586B1 EP 0294586 B1 EP0294586 B1 EP 0294586B1 EP 19880107193 EP19880107193 EP 19880107193 EP 88107193 A EP88107193 A EP 88107193A EP 0294586 B1 EP0294586 B1 EP 0294586B1
Authority
EP
European Patent Office
Prior art keywords
contact
cap nut
injection nozzle
nozzle
insulating body
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
EP19880107193
Other languages
German (de)
English (en)
Other versions
EP0294586A2 (fr
EP0294586A3 (en
Inventor
Bernhard. Dipl.-Ing. Kaczyinski
Alfred Dipl.-Ing. Schmidt
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 EP0294586A2 publication Critical patent/EP0294586A2/fr
Publication of EP0294586A3 publication Critical patent/EP0294586A3/de
Application granted granted Critical
Publication of EP0294586B1 publication Critical patent/EP0294586B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 fuel injector for internal combustion engines according to the preamble of the main claim.
  • injection nozzles of this type DE-A1 35 02 098
  • the contact lug attached to the contact ring is directly connected by soldering to the wall section of the conductor element leading to the incandescent body which projects into the area of the wall opening of the union nut.
  • this version it is not easy to securely isolate the live parts in the wall opening of the union nut and to seal the wall opening watertight.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the current-carrying parts are perfectly insulated from the wall opening and this is sealed watertight, these means also facilitate contacting the current-carrying parts.
  • the assembly of the parts is facilitated if the insulating body inserted into the wall opening of the union nut is integrally formed on the ring sleeve carrying the contact ring via a web part.
  • the molded part forming the insulating body, the web part and the ring sleeve can be produced simply in a two-part tool if the molded part is designed in the initial state so that the web part has a right-angled deflection and the recess in the insulating body which serves to accommodate the contact element is parallel to the axis of the Ring cuff runs.
  • FIG. 1 shows the exemplary embodiment enlarged in longitudinal section
  • FIG. 2 shows the conductor element of the exemplary embodiment in longitudinal section
  • FIG. 3 shows a plan view of the conductor element according to FIG. 2
  • FIG. 4 shows a molded part used in the exemplary embodiment in the initial state
  • FIG. 5 shows a plan view of the molded part according to FIG. 4 .
  • the injection nozzle has a nozzle body 10, in which a valve seat is formed and a valve needle is slidably mounted.
  • the nozzle body 10 and an intermediate disk 12 which limits the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16 in which a closing spring which presses the valve needle against the valve seat is accommodated.
  • the nozzle body 10 is provided with a conical wall section 18 which merges into a flat end wall 20.
  • the union nut 14 is extended on the combustion chamber side beyond the nozzle body 10 and is provided downstream of its end wall 20 with an inner support shoulder 22, against which an annealing insert, designated as a whole by reference number 24, bears.
  • an annealing insert designated as a whole by reference number 24, bears.
  • the latter has a filament 26 designed as a wire coil, which forms a passage 28 for the spray jets 30.
  • the incandescent body 26 is dimensioned such that the spray jets 30 do not wet the incandescent body 26, but do produce an injector effect, by means of which air is sucked out of the combustion chamber into the interior of the incandescent body 26 or into the edge zones of the spray jets passing through the incandescent body 26.
  • the incandescent body 26 is surrounded by a metallic bush 32, which is fitted into a bore 34 of the union nut 14 and is provided with a flange 36 which bears against the support shoulder 22.
  • the bushing 32 has a flanged collar 38 which is folded outwards and holds the bushing 32 in the bore 34 without play.
  • the bushing 32 has an inwardly directed annular collar 40, which is provided with bores 42 and holds the end of the incandescent body 26 centered on the combustion chamber.
  • a first insulating body 44, a contact disk 46, a second insulating body 48 and a metallic retaining ring 50 are successively fastened to the flange 36 of the socket 32 by gluing or soldering, an auxiliary tool centering the parts mutually.
  • the contact disk 46 is provided with bores 52 and an inner flanged collar 54 which contacts the upstream end of the incandescent body 26 and holds it in a centered manner.
  • the outer ring edge portion 55 of the contact disk 46 is drawn conically upwards.
  • a heat protection ring 56 is clamped, the conically raised outer ring edge 58 of which rests on the conical wall section 18 of the nozzle body 10.
  • the spray jets 30 passing through the incandescent body 26 produce an injector effect, through which air is sucked in from the combustion chamber through the bores 42 into an annular space 60 surrounding the incandescent body 26 and from there into the peripheral zones of the spray jets, in cooperation with the heating by the Incandescent body 26 gives a good mixture preparation.
  • a conductor element designated as a whole by reference number 62, which connects the contact disk 46 to a contact ring 64, which is fastened on the union nut 14 above a screw thread 66.
  • the conductor element 62 is formed over part of its length as a sleeve 68 (FIG. 2), the downstream edge section 69 of which is drawn in conically inwards in accordance with the design of the contact disk 46.
  • a sleeve 68 (FIG. 2)
  • the sleeve 68 extends in an annular gap 74 which is between a smaller diameter section of the nozzle body 10 and the wall a first bore section 76 of the union nut 14 is formed. At a clamping shoulder 78, this merges into a second bore section 80, which comprises a larger diameter section of the nozzle body 10 with an annular gap 82, in which the contact tongues 72 extend.
  • the sleeve 68 and the contact tongues 72 are provided on the inside and outside with insulating coverings 84 (FIG. 1), which have been omitted in FIGS. 2 and 3 for the sake of simplicity.
  • a pressure ring 88 is arranged, via which the union nut 14 clamps the nozzle body 10 and the washer 12 against the nozzle holder 16.
  • the pressure ring 88 three recesses 90 are provided, which are offset by 120 ° to each other, through which the contact tongues 72 with their bent portions 92 pass in an isolated manner.
  • the contact tongues 72 are connected to a ring web 94, which also has an insulating coating, which extends over two 120 ° divisions and is recessed over the length of the third 120 ° divisions.
  • the contact tongues 72 correspond to three wall openings 92 of the union nut 14, in each of which a bush-like insulating body 98 with a contact member 100 stuck therein is pressed.
  • the contact ring 64 is molded into a ring sleeve 102 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66.
  • Connected to the contact ring 64 are three contact lugs 103 offset by 120 °, each of which extends through a recess 104 in a ring collar 105 of the ring sleeve 102 and presses in a contacting manner against the spherical end face of the associated contact member 100.
  • On the other face of the Contact members 100 resiliently rest the slightly bent outward end sections of the three contact tongues 72 with sufficient pressure.
  • the contact lugs 103 and contact tongues 72 can also be connected to the contact members 100 by soldering or welding.
  • the three insulating bodies 98 are each integrally formed on the ring sleeve 102 via a web part 106.
  • the molded part 108 which forms the insulating bodies 98, the web parts 106 and the annular sleeve 102 is designed in the initial state in such a way that the web parts 106 have a right-angled deflection 110 and the cutouts 112 in the insulating bodies 98 used to receive the contact members 100 parallel to the axis of the ring cuff 102.
  • the molded part 108 can be produced in a simple, two-part tool.
  • the contact members 100 which can also be designed as a ball, for example, and possibly also the contact ring 64, are advantageously molded or molded onto the molded part 108 when it is produced.
  • the insulating bodies 98 are bent back accordingly and then pressed together with the contact members 100 into the wall openings 96 of the union nut 14.
  • the insulators 98 are provided on the inward-facing sides with lugs 114, which keep the contact points of the contact tongues 72 with the contact members 100 away from the outer surface of the washer 12 and center these with sufficient accuracy before tightening the union nut 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (6)

  1. Injecteur de combustible pour moteurs à combustion interne, avec un corps de buse (10) fixé par un écrou d'accouplement (14) sur un support de buse (16) et un filament à incandescence (26) disposé en aval du corps de buse, qui constitue une traversée pour les jets injectés (30) et qui est relié à un élément conducteur électrique (62) constitué sur au moins une partie de sa longueur par un manchon qui s'étend de manière isolée dans une rainure entre le corps de butée et l'écrou d'accouplement et est prévu avec au moins une section de paroi (72) faisant saillie dans la zone d'une traversée de paroi (96) de l'écrou d'accouplement (14) et est reliée électriquement à cet endroit à une palette de contact (103) d'une bague de contact (64) fixée sur un manchon annulaire en matériau isolant placée à la périphérie de l'écrou d'accouplement (14), caractérisée en ce que dans la traversée de paroi (96) de l'écrou d'accouplement (14), on introduit un élément isolant (98) comportant un contact métallique (100) au moyen duquel on met en contact à l'extérieur la palette de contact (103) de la bague de contact (64) et à l'intérieur, dans la zone de la traversée de paroi (96), la section en saillie (72) de l'élément conducteur aboutissant au filament à incandescence (26).
  2. Injecteur conforme à la revendication 1, caractérisée en ce que l'élément isolant (98) introduit dans la traversée de paroi (96) de l'écrou d'accouplement (14) est formé d'une seule pièce par une barrette (106) sur le manchon annulaire (102) portant la bague de contact (64).
  3. injecteur conforme à la revendication 2, caractérisée en ce que la forme finale de la pièce usinée (108, figure 4) constituée par l'élément isolant (98), la barrette (106), et le manchon annulaire (102) est telle que la barrette (106) comporte une pièce coudée (110)rectangulaire et que l'évidement (112) servant à recevoir le contact (100) est parallèle dans l'élément isolant à l'axe du manchon annulaire (102).
  4. Injecteur conforme à l'une des revendications 1 à 3, caractérisée en ce que le contact (100) et le cas échéant la bague de contact (64) sont moulés lors de la fabrication de l'élément isolant (98) et de la pièce usinée (108).
  5. Injecteur conforme à l'une des revendications précédentes, dans laquelle la ou les traversées de paroi servant à l'établissement des contacts dans l'écrou d'accouplement sont disposées dans le haut d'une rondelle intermédiaire serrée entre le corps de buse et le support de buse et qui sert à limiter le déplacement d'une tige de soupape guidée dans le corps de buse, caractérisée en ce que le ou les éléments isolants (98) sont prévus du côté de l'axe de la buse avec des appendices (114) faisant saillie au-dessus des surfaces de contact correspondantes du contact (120), évitant un contact entre la section de paroi (72) de l'élément conducteur (62) adjacente au contact (100) et la rondelle intermédiaire (12), et servant aussi avantageusement au centrage de cette dernière.
  6. Injecteur conforme à l'une des revendications précédentes, caractérisée en ce que les palettes de contact (103) placées sur la bague de contact (64) attaquent à travers des évidements de bordure (104) un rebord annulaire (106) du manchon annulaire (102) faisant saillie au-dessus de la paroi frontale voisine de la bague de contact (64).
EP19880107193 1987-06-11 1988-05-05 Buse d'injection de combustible pour moteurs à combustion interne Expired - Lifetime EP0294586B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873719458 DE3719458A1 (de) 1987-06-11 1987-06-11 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3719458 1987-06-11

Publications (3)

Publication Number Publication Date
EP0294586A2 EP0294586A2 (fr) 1988-12-14
EP0294586A3 EP0294586A3 (en) 1990-01-31
EP0294586B1 true EP0294586B1 (fr) 1991-12-18

Family

ID=6329472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880107193 Expired - Lifetime EP0294586B1 (fr) 1987-06-11 1988-05-05 Buse d'injection de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0294586B1 (fr)
JP (1) JPS6419167A (fr)
DE (2) DE3719458A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993390A (en) * 1988-05-27 1991-02-19 Mitsubishi Jidosha Kogyo Akbushiki Kaisha Injector positioning device
JPH0437980U (fr) * 1990-07-25 1992-03-31
US5730109A (en) * 1995-11-02 1998-03-24 Tag Co., Ltd. Exhaust gas purification system in combustion engine
JP3033499B2 (ja) * 1996-08-22 2000-04-17 三菱自動車工業株式会社 シリンダヘッドのシール装置
DE19743103A1 (de) * 1997-09-30 1999-04-01 Bosch Gmbh Robert Wärmeschutzhülse
DE19838748B4 (de) * 1998-08-26 2008-06-19 Daimler Ag Auf den Brennraum einer Brennkraftmaschine einspritzende Kraftstoffeinspritzdüse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207147B (de) * 1962-12-22 1965-12-16 Beru Werk Ruprecht Gmbh Co A Anlasshilfe fuer Brennkraftmaschinen
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE3719458A1 (de) 1988-12-29
EP0294586A2 (fr) 1988-12-14
EP0294586A3 (en) 1990-01-31
DE3866956D1 (de) 1992-01-30
JPS6419167A (en) 1989-01-23

Similar Documents

Publication Publication Date Title
DE3731211C2 (fr)
EP0538247B1 (fr) Soupape d'injection de carburant
EP0045530A2 (fr) Soupape injectrice de combustible pour moteurs à combustion
DE2932480A1 (de) Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP0020888A1 (fr) Injecteur de combustible pour moteurs à combustion interne
EP0294586B1 (fr) Buse d'injection de combustible pour moteurs à combustion interne
EP0188746B1 (fr) Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne
EP0188744B1 (fr) Injecteur de combustible pour moteurs à combustion interne
DE10117641A1 (de) Stabglühkerze
EP0068339B1 (fr) Buse d'injection de carburant pour moteurs à combustion interne
EP0188745B1 (fr) Injecteur de carburant pour moteurs à combustion interne
EP0298962B1 (fr) Systeme d'injection de carburant dans des chambres de combustion d'un moteur a combustion interne
DE3502110C2 (fr)
DE3404710A1 (de) Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
DE19627524A1 (de) Zündkerze
DE2936370A1 (de) Kraftstoff-einspritzduese fuer dieselmotoren
DE3831989A1 (de) Einrichtung zum einspritzen von kraftstoff in den brennraum einer selbstzuendenden brennkraftmaschine
DE4216384C1 (de) Einrichtung zum Beheizen eines Kraftstoff-Luft-Gemisches einer Brennkraftmaschine mit Kraftstoffeinspritzung
DE3837808A1 (de) Zuendverteiler fuer zuendanlagen von brennkraftmaschinen
DE3937750A1 (de) Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP0266361B1 (fr) Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion
DE1204018B (de) Anordnung des Zuendkabelanschlusses an einer Zuendkerze
DE686731C (de) Zuendstromverteilerkopf
DE3502113A1 (de) Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP1006630A2 (fr) Chambre de combustion pour véhicule

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19900713

17Q First examination report despatched

Effective date: 19910211

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3866956

Country of ref document: DE

Date of ref document: 19920130

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: ROBERT BOSCH GMBH

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920429

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920527

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930505

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930505

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050505