EP0188744A2 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

Info

Publication number
EP0188744A2
EP0188744A2 EP85115986A EP85115986A EP0188744A2 EP 0188744 A2 EP0188744 A2 EP 0188744A2 EP 85115986 A EP85115986 A EP 85115986A EP 85115986 A EP85115986 A EP 85115986A EP 0188744 A2 EP0188744 A2 EP 0188744A2
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.)
Granted
Application number
EP85115986A
Other languages
German (de)
English (en)
Other versions
EP0188744A3 (en
EP0188744B1 (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 guide 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.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the incandescent body to its holder and Parts provided for contacting and the conductor element designed according to the invention as a prefabricated structural unit can be inserted without problems from the upstream end into the union nut and can be pushed up to an inner support shoulder of the union nut, on which they rest after the parts have been assembled. This can facilitate assembly in many cases and dispense with a firm connection of the parts with the union nut.
  • the conductor element is properly centered and held on the inside wall of the union nut, so that special operations are not required.
  • 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 is connected to a local one Edge recess for passing through the contact tongue is provided.
  • the rigidity of the conductor element can be further increased if a plurality of contact tongues which are simultaneously distributed over the circumference of the sleeve and which are connected to one another by an annular web interrupted at one point are attached to the section of the conductor element designed as a sleeve.
  • a pressure ring which may be present can be temporarily widened of the contact tongue ring is pushed into its correct position and then used together with the conductor element and the other parts of the glow insert which form a prefabricated structural unit in the union nut.
  • 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 fastened 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.
  • FIG. 1 shows the first embodiment enlarged in longitudinal section
  • FIG. 2 shows the conductor element according to FIG. 1 in longitudinal section
  • FIG. 3 shows a plan view of the conductor element according to FIG. 2
  • FIGS. 4, 5 and 6 each show a partial section through the second, third and fourth embodiment .
  • 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 socket 32 has a flanged collar 38 which is folded outwards and holds the socket 32 in the bore 34 without play.
  • the socket 32 has an inward ring Bund 40, which is provided with holes 42 and holds the combustion chamber end of the glow body 26 centered.
  • 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 50 of the contact disk 46 is drawn conically upwards. Between the retaining ring 50 and the end wall 20 of the nozzle body 10, 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 (FIG. 2), the downstream edge section 69 of which is drawn in conically inwards in accordance with the design of the contact disk 46.
  • At the upstream edge 70 of the sleeve 68 are three contact tongues 72, each offset by 120 0, are formed.
  • the sleeve 68 extends in an annular gap 74 which is formed between a section of the nozzle body 10 with a smaller 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 section of the nozzle body 10 which is larger in diameter and has 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 0 divisions and is recessed over the length of the third 120 ° division.
  • 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 and extends into the wall opening 96 the union nut 14 protrudes 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 bent portions 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 32 of the socket 30 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 ring web 94 gives the conductor element 62 also in loading rich of the contact tongues 72 has a sufficiently high stiffness without significantly complicating the insertion of the pressure ring 88.
  • the arrangement of the ' pressure ring 88 eliminates recesses in the ring 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 firmly clamped.
  • 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, with the free bent to an eyelet 104 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 region 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 at one or more points with openings 114 for the contact tongue 72a.
  • 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 injector of Figure 6 differs from the embodiments of Figures 1 and 4 essentially in that. Connecting the contact disk 46 to the contact ring 64 or the cable 102 two axially arranged and interconnected conductor elements 116 and 118 are provided and 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 between the end face 129 of the support body 120 and an annular shoulder 130 of the union nut 122 with the interposition of insulating disks 126, 128.
  • 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 passes through 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)
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 true EP0188744A2 (fr) 1986-07-30
EP0188744A3 EP0188744A3 (en) 1987-06-24
EP0188744B1 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)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190960A (en) * 1986-05-23 1987-12-02 Bosch Gmbh Robert Incandescent igniters for fuel injected internal combustion engines
DE3724092A1 (de) * 1987-07-21 1989-02-02 Bosch Gmbh Robert Vorrichtung zur kraftstoffeinspritzung
GB2158513B (en) * 1984-05-11 1989-03-08 Barkas Werke Veb Glow plug in an internal combustion engine
EP0266361B1 (fr) * 1986-05-09 1991-12-18 Robert Bosch Gmbh Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
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
DE102016206796A1 (de) * 2016-04-21 2017-10-26 Robert Bosch Gmbh Kraftstoffinjektor

Citations (8)

* 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
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
GB2131539A (en) * 1982-12-02 1984-06-20 Lucas Ind Plc Electric starting aids for internal combustion engines
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion
GB2147357A (en) * 1983-09-29 1985-05-09 Bosch Gmbh Robert Fuel injectors for I.C. engines
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
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502098A1 (de) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (8)

* 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
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
GB2131539A (en) * 1982-12-02 1984-06-20 Lucas Ind Plc Electric starting aids for internal combustion engines
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion
GB2147357A (en) * 1983-09-29 1985-05-09 Bosch Gmbh Robert Fuel injectors for I.C. engines
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
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158513B (en) * 1984-05-11 1989-03-08 Barkas Werke Veb Glow plug in an internal combustion engine
EP0266361B1 (fr) * 1986-05-09 1991-12-18 Robert Bosch Gmbh Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion
GB2190960A (en) * 1986-05-23 1987-12-02 Bosch Gmbh Robert Incandescent igniters for fuel injected internal combustion engines
GB2190960B (en) * 1986-05-23 1989-12-13 Bosch Gmbh Robert Apparatus for the injection of fuel into a combustion chamber of an internal combustion engine
DE3724092A1 (de) * 1987-07-21 1989-02-02 Bosch Gmbh Robert Vorrichtung zur kraftstoffeinspritzung

Also Published As

Publication number Publication date
EP0188744A3 (en) 1987-06-24
EP0188744B1 (fr) 1988-10-12
JPS61169659A (ja) 1986-07-31
DE3502098A1 (de) 1986-07-24
JP2545507B2 (ja) 1996-10-23
DE3565575D1 (en) 1988-11-17

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