EP0188744B1 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0188744B1
EP0188744B1 EP85115986A EP85115986A EP0188744B1 EP 0188744 B1 EP0188744 B1 EP 0188744B1 EP 85115986 A EP85115986 A EP 85115986A EP 85115986 A EP85115986 A EP 85115986A EP 0188744 B1 EP0188744 B1 EP 0188744B1
Authority
EP
European Patent Office
Prior art keywords
union nut
contact
conductor element
injection nozzle
ring
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
EP85115986A
Other languages
German (de)
English (en)
Other versions
EP0188744A3 (en
EP0188744A2 (fr
Inventor
Bernhard Dipl.-Ing. Kaczynski
Alfred Dr. Ing. 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 EP0188744A2 publication Critical patent/EP0188744A2/fr
Publication of EP0188744A3 publication Critical patent/EP0188744A3/de
Application granted granted Critical
Publication of EP0188744B1 publication Critical patent/EP0188744B1/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
    • 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 fuel injection nozzle according to the preamble of the main claim.
  • the electrical conductor element is designed over its entire length as a cable which is passed through an oblique transverse bore and a longitudinal groove in the wall of the union nut.
  • This arrangement is very simple, but requires that the incandescent body and the parts provided for holding and contacting it are attached to the union nut from the front end of the combustion chamber if the conductor element is to be contacted with the incandescent body before the parts are assembled.
  • Patent applications EP-A-0 188 743, EP-A-0 188 745 and EP-A-0 188 746 deal with fuel injection nozzles of a similar type to the present invention.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the incandescent body, the parts provided for its mounting and contacting and the conductor element designed according to the invention can be used as a prefabricated structural unit in the union nut or attached to it without problems.
  • the conductor element When installing the unit from the upstream end, the conductor element is correctly centered and held on the inner wall of the union nut, so that special operations for this are omitted.
  • the conductor element can simply be immersed in an insulating compound and the coating thus formed can then be solidified by suitable measures.
  • a torsionally rigid connection of the conductor element to the contact element of the incandescent body is obtained if the contact element is a contact ring disk with a conically raised outer ring edge region and the edge region of the conductor element facing the contact element is correspondingly drawn in conically.
  • the assembly is facilitated if the wall section of the conductor element projecting into the area of a wall opening of the union nut is an axially attached contact tongue.
  • the nozzle body of which has an outer annular shoulder against which an inner clamping shoulder of the union nut presses and in which the contact tongues are extended beyond the annular shoulder it is proposed to facilitate production that a pressure ring is arranged between the annular shoulder and the clamping shoulder, which has a local edge recess is provided for the passage of the contact tongue.
  • the stiffness of the conductor element can be further increased if a plurality of contact tongues, which are connected at the same time and distributed over the circumference of the sleeve, are attached to the section of the conductor element which is designed as a sleeve and which are connected to one another via an annular web interrupted at one point.
  • an existing pressure ring can be pushed into its proper position while temporarily widening the contact tongue ring and then inserted into the union nut together with the conductor element and the other parts of the glow insert that form a prefabricated structural unit.
  • a shake-proof connection of the conductor element to an outer connecting conductor can be achieved if the conductor element is connected to a contact ring which is attached to the outside of the union nut in an insulated manner.
  • the contact element of the outer connecting conductor can expediently be a contact pin which presses radially against the contact ring. If the contact ring is provided on the union nut upstream of the screw-in thread, the contact element to be connected can expediently be designed as a clamp which can be firmly clamped onto the contact ring.
  • the injection nozzle according to FIG. 1 has 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 12 which limits the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16 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 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, through which air is sucked out of the combustion chamber into the interior of the incandescent body 26 or into the peripheral 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 washer 46, a second insulating body 48 and a metallic holding washer 50 are successively attached to the flange 36 of the bushing 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 cause 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 designed over part of its length as a sleeve 68 (FIG. 2), the downstream edge section 69 of which is drawn in conically in accordance with the design of the contact disk 46.
  • a sleeve 68 (FIG. 2)
  • the downstream edge section 69 of which is drawn in conically in accordance with the design of the contact disk 46.
  • the sleeve 68 extends in an annular gap 74 which is formed between a section of the nozzle body 10 which is smaller in diameter and the wall of a first bore section 76 of the union nut 14. 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 are 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 and extends over two 120 ° divisions and over the length of the third 120 ° division is omitted.
  • One of the contact tongues 72 corresponds to a wall opening 96 of the union nut 14, into which the free end of the contact tongue 72, which is slightly bent outwards, projects.
  • the contact ring 64 is molded into a ring sleeve 98 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66.
  • a contact tab 99 is formed on the contact ring 64, which protrudes into the wall opening 96 of the union nut 14 and is soldered there to the one contact tongue 72 of the conductor element 62.
  • the contact ring 64 can also be provided with two or three contact tabs 99, which are connected to contact tongues 72 of the conductor element 62 in the region of further wall openings in the union nut 14.
  • the glow insert 24 When assembling the injection nozzle according to FIG. 1, the glow insert 24 is first prefabricated and connected to the conductor element 62 by soldering. Thereafter, the pressure ring 88 is inserted into the conductor element 62, temporarily widening the contact tongue ring until it bears against the bends 92. The glow insert 24 together with the conductor element 62 and the pressure ring 88 is then inserted into the union nut 14, the flange collar 38 of the socket 32 is folded over and the contact tongue 72 is connected to the contact tab 99 of the contact ring 64. Through these operations, one connection end of the filament 26 is connected to the contact ring 64 and the other connection end of the filament 26 is contacted with ground.
  • the heat protection ring 56 is placed on the nozzle body 10, and then the union nut 14 is slipped onto the parts and screwed onto the nozzle holder 16. In this case, the heat protection ring 56 is clamped and the nozzle body 10 and the intermediate disk 12 are firmly connected to the nozzle holder 16 via the pressure ring 88.
  • the heat protection ring 56 seals the installation space of the incandescent body 26 against the annular gap 74, so that no additional sealing elements and measures have to be provided for this.
  • the conductor element 62 is an inherently rigid structure that is easy to handle and can be integrated into the production process.
  • the annular web 94 gives the conductor element 62 a sufficiently high rigidity in the area of the contact tongues 72, without making the insertion of the pressure ring 88 noticeably more difficult.
  • the arrangement of the pressure ring 88 eliminates recesses in the annular shoulder 78 for the passage of the contact tongues 72, which would require increased production costs.
  • the conductor element 62 can be connected to the glow insert 24 before it is installed in the union nut 14 and the forces exerted by the tensioned heat protection ring 56 on the glow insert 24 are received in a dimensionally stable manner by the support shoulder 22 of the union nut 14.
  • the contact element for the outer connecting conductor as a contact ring 64, a cable tail on the injection nozzle is avoided and a large contact surface is created on which a mating contact element designed as a clamp or the like can be clamped firmly.
  • the injection nozzle according to FIG. 4 differs from that according to FIG. 1 essentially only in that instead of a contact ring 64, a soldering point is provided on the nozzle holder 16, which is connected via a cable 102 which is passed through a longitudinal bore in the union nut 14 and which is bent to form an eyelet 104 free end of a contact tongue 72 of the conductor element is connected.
  • the connection of a conductor element 62a with a cable 106 leading to a soldering point on the nozzle holder is shifted into the area of the union nut 14a located downstream of the screw thread 66.
  • the conductor element 62a has a shortened sleeve 68a and a shortened contact tongue 72a, the free end of which protrudes into a wall opening 96a forms a cable lug 108 for the cable 106.
  • a slotted insulating ring 110 is blown into a backward rotation 112 in the union nut 14a, which is provided with openings 114 for the contact tongue 72a at one or more points.
  • An annular shoulder 78a on the union nut 14a lies directly against the annular shoulder 86 of the nozzle body 10 without a pressure ring.
  • the injection nozzle according to FIG. 6 differs from the exemplary embodiments according to FIGS. 1 and 4 essentially in that two conductor elements 116 and 118 which are arranged axially one behind the other and are connected to one another are provided for connecting the contact disk 46 to the contact ring 64 or the cable 102, and in that the glow insert is fastened in a support body 120 which is welded to a correspondingly shortened union nut 122.
  • the conductor element 116 is designed over its entire length as a full-walled socket with a reinforced ring flange 124, which is clamped 1: t with the interposition of insulating washers 126, 128 between the end face 129 of the support body 120 and an annular shoulder 130 of the union nut 122.
  • the annular shoulder 130 is formed on an inner annular collar 132 of the union nut 122, the upper annular surface of which serves as a clamping shoulder 134 which clamps the nozzle body 10 and the intermediate disk against the nozzle holder via a pressure ring 136.
  • the upstream conductor element 118 is also designed as a sleeve, which is provided on the lower ring edge with at least one projecting contact tongue 138, which passes through an edge recess 140 in the pressure ring 136 and protrudes into the area of a wall opening 142 of the union nut 122, which is arranged in the plane of the ring flange 124.
  • the contact tongue 138 extends over the ring flange 124 and is connected to it by soldering.
  • the conductor element 118 is likewise provided with at least one contact tongue which is connected to a contact ring according to FIG. 1 or to a further cable according to FIG.
  • the arrangement according to FIG. 6 is characterized by a particularly rigid design of the conductor element.

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 (9)

1. Injecteur de carburant pour moteurs à combustion interne, avec un corps d'injecteur (10) bridé par un écrou de raccordement (14) sur un support d'injecteur (16), et avec un corps à incandescence (26) disposé en aval du corps d'injecteur (10) et maintenu sur l'écrou de raccordement (14), ce corps à incandescence ménageant un passage (28) pour les jets d'injection étant relié à un élément électriquement conducteur (62) qui s'étend contre une paroi de l'écrou de raccordement (14) de façon au moins approximativement parallèle à l'axe de l'injecteur, injecteur caractérisé en ce que l'élément électriquement conducteur (62) est réalisé sur au moins une partie de sa longueur sous la forme d'une douille (68) qui s'étend en étant isolée dans un intervalle annulaire entre le corps d'injecteur (10) et l'écrou de raccordement (14) et qui est munie d'au moins une partie de paroi (72) pénétrant dans la zone d'un ajour (96) de la paroi de l'écrou de raccordement (14), où cette partie de paroi (72) est en contact avec un conducteur (64,102) allant plus loin.
2. Injecteur selon la revendication 1, caractérisé en ce que le corps à incandescence (26) est entouré avec un jeu radial par une douille (32) qui est mise en place dans un perçage (34) de l'écrou de raccordement (14), cette douille portant un élément de contact (46) relié avec une des extrémités de raccordement du corps à incandescence (26) et pressant fermement contre la face frontale tournée vers lui du corps d'injecteur (10) un anneau de protection contre la chaleur (56).
3. Injecteur selon la revendication 2, caractérisé en ce que l'élément de contact (46) est un disque annulaire de contact avec une zone extérieure de bord annulaire (55) redressée en forme de cône, et que la zone de contact (69) tournée vers l'élément de contact (46) de l'élément conducteur (62) est rétrécie coniquement de façon correspondante.
4. Injecteur selon l'une des revendications 1 à 3, caractérisé en ce que la partie de paroi de l'élément conducteur (62) pénétrant dans la zone d'un ajour (96) de la paroi de l'écrou de raccordement (14) est une languette de contact (72) rapportée axialement.
5. Injecteur selon la revendication 4, caractérisé en ce que le corps d'injecteur comporte un épaulement annulaire externe (86) contre lequel s'appuie un premier épaulement (78) de l'écrou de raccordement, et la languette de contact (72) se prolonge vers l'extérieur au-delà de l'épaulement annulaire (86) tandis qu'entre cet épaulement annulaire (86) et l'épaulement de bridage (78) est disposé un anneau de pression (88) lequel est muni d'un évidement de bordure localisé (90) pour le passage de la languette de contact (72).
6. Injecteur selon la revendication 4 ou 5, caractérisé en ce que sur la partie en forme de douille (68) de l'élément conducteur (62) sont rapportées plusieurs languettes de contact (72) réparties uniformément à la périphérie, et qui par l'intermédiaire d'une âme annulaire (94) interrompue en un point, sont reliées ensemble.
7. Injecteur selon l'une des revendications 1 à 6, caractérisé en ce que l'élément conducteur (62) est relié à un anneau de contact (64) qui en étant isolé, est fixé extérieurement sur l'écrou de raccordement (14).
8. Injecteur selon l'une des revendications 1 à 6, caractérisé en ce que l'élément conducteur (62a) est relié à un câble de raccordement (102) allant plus loin, lequel s'étend à travers un perçage longitudinal dans la paroi de l'écrou de raccordement (14) et aboutit à un point de support brasé sur le support d'injecteur ou bien sur l'écrou de raccordement (14) ou bien fait saillie sous la forme d'une queue de câble hors de l'écrou de raccordement.
9. Injecteur selon la revendication 1, caractérisé en ce qu'il est prévu deux éléments conducteurs disposés axialement l'un derrière l'autre (116, 118), dont l'un (116) est inséré dans un corps porteur (120) soudé sur l'écrou de raccordement (122) et recevant l'insert à incandescence (24), et cet élément conducteur (116) est muni d'une bride annulaire (124) qui est étroitement bridée entre des surfaces d'épaulement (129, 130) sur le corps porteur (120) et l'écrou de raccordement (122) et qui est électriquement reliée à au moins une languette de contact axiale (138) de l'autre élément conducteur (118).
EP85115986A 1985-01-23 1985-12-14 Injecteur de combustible pour moteurs à combustion interne Expired EP0188744B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502098 DE3502098A1 (de) 1985-01-23 1985-01-23 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3502098 1985-01-23

Publications (3)

Publication Number Publication Date
EP0188744A2 EP0188744A2 (fr) 1986-07-30
EP0188744A3 EP0188744A3 (en) 1987-06-24
EP0188744B1 true EP0188744B1 (fr) 1988-10-12

Family

ID=6260513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115986A Expired EP0188744B1 (fr) 1985-01-23 1985-12-14 Injecteur de combustible pour moteurs à combustion interne

Country Status (3)

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EP (1) EP0188744B1 (fr)
JP (1) JP2545507B2 (fr)
DE (2) DE3502098A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD228598A1 (de) * 1984-05-11 1985-10-16 Karl Marx Stadt Automobilbau Gluehkerzenanordnung, vorzugsweise fuer vorkammer-verbrennungsmotoren
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3615634A1 (de) * 1986-05-09 1987-11-12 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3617354A1 (de) * 1986-05-23 1987-11-26 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
JPS6394071A (ja) * 1986-10-07 1988-04-25 Nippon Denso Co Ltd 内燃機関
DE3719458A1 (de) * 1987-06-11 1988-12-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3724092A1 (de) * 1987-07-21 1989-02-02 Bosch Gmbh Robert Vorrichtung zur kraftstoffeinspritzung
DE102016206796A1 (de) * 2016-04-21 2017-10-26 Robert Bosch Gmbh Kraftstoffinjektor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
EP0188746A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne
EP0188743A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1382697A (fr) * 1964-02-17 1964-12-18 Dispositif d'injection et d'allumage pour moteurs à combustion
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
DE3327773A1 (de) * 1983-05-13 1984-11-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur kraftstoffeinspritzung in brennraeume
DE3335298A1 (de) * 1983-09-29 1985-04-18 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
EP0188746A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne
EP0188743A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne

Also Published As

Publication number Publication date
DE3565575D1 (en) 1988-11-17
JP2545507B2 (ja) 1996-10-23
JPS61169659A (ja) 1986-07-31
EP0188744A3 (en) 1987-06-24
DE3502098A1 (de) 1986-07-24
EP0188744A2 (fr) 1986-07-30

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