EP0188745A2 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

Info

Publication number
EP0188745A2
EP0188745A2 EP85115988A EP85115988A EP0188745A2 EP 0188745 A2 EP0188745 A2 EP 0188745A2 EP 85115988 A EP85115988 A EP 85115988A EP 85115988 A EP85115988 A EP 85115988A EP 0188745 A2 EP0188745 A2 EP 0188745A2
Authority
EP
European Patent Office
Prior art keywords
sleeve
union nut
injection nozzle
nozzle according
support shoulder
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
EP85115988A
Other languages
German (de)
English (en)
Other versions
EP0188745A3 (en
EP0188745B1 (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 EP0188745A2 publication Critical patent/EP0188745A2/fr
Publication of EP0188745A3 publication Critical patent/EP0188745A3/de
Application granted granted Critical
Publication of EP0188745B1 publication Critical patent/EP0188745B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • a known injection nozzle of this type (DE-A1 33 35 920)
  • the support shoulder for the sleeve is formed on an annular body which is welded to the union nut and presses the sleeve together with the contact disk and insulating washers onto the end face of the union nut.
  • This design is relatively complex and requires tight tolerances on the union nut and ring body so that the glow body is exactly aligned with the nozzle axis.
  • an incandescent body is inserted into a sleeve, which is attached to the end of the union nut on the combustion chamber side and is welded to the union nut (DE-A1 33 07 109).
  • this design does not require an additional ring body for fastening the sleeve, the weld seam is constantly under tension if a tensioned heat protection ring is arranged between the glow body or contact disk and the nozzle body.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the tensioning forces possibly acting on the sleeve are intercepted in a dimensionally stable manner by the support shoulder on the union nut without an additional ring body having to be welded to the union nut.
  • the section of the union nut encompassing the sleeve can be made longer if the wall openings of the sleeve extend from its downstream end face.
  • the arrangement can advantageously be such that the sleeve has an inwardly directed annular collar at the downstream end which holds the one end of the incandescent body centered and is provided with the wall openings. This means that also facilitates the assembly of the glow insert consisting of sleeve, incandescent body, contact disk and insulating washers.
  • the centering of the annular insulating bodies can be carried out, for example, by means of a cylindrical section of the sleeve which adjoins the flange and which suitably encompasses the outside of the insulating body and the contact disk.
  • the insulating body lying between the contact disk and the sleeve is centered on the sleeve by an annular collar engaging in its bore. This increases the diameter of the insulating body and reduces the heat radiation from the incandescent body onto the insulating body.
  • the parts can also be centered in a joining tool in which the parts are expediently connected to one another. This means that a centering projection for the parts can be dispensed with entirely on the sleeve.
  • a perfect seal between the sleeve and the nozzle body and, at the same time, good thermal protection of the nozzle body results if a pressure-resistant metallic retaining ring rests on the insulating body facing the nozzle body. against which a sealing and heat protection ring resting against the end wall of the nozzle body is supported.
  • a pressure-resistant metallic retaining ring rests on the insulating body facing the nozzle body. against which a sealing and heat protection ring resting against the end wall of the nozzle body is supported.
  • the 'facing at least on its side facing the nozzle body end face is provided with a metallization.
  • the clamping force of the sealing and heat protection ring can advantageously also serve to hold the parts of the glow insert to one another and to the union nut so that the parts do not have to be glued or soldered to one another. In some cases, however, it may be advantageous with a view to facilitating assembly if the sleeve, the contact disk, the insulating body, the incandescent body and, if appropriate, the retaining ring form a prefabricated structural unit which is inserted as a whole into the union nut.
  • the ventilation of the incandescent body can be further improved and the thermal load on the insulating bodies or their connections to the sleeve and the contact disk can be further reduced if the incandescent body is tapered towards the nozzle body in adaptation to the spray jet shape. If a wire coil is used as the incandescent body, the conical design, as a further advantage, results in better dynamic behavior compared to a cylindrical design of the incandescent body, and therefore reduces the risk of breakage.
  • the measure is also used to provide the contact disk with holes in the region of the annular space formed between the sleeve and the incandescent body for the air drawn in to pass through.
  • the assembly of an injection nozzle provided with a heat protection ring is further facilitated if the outer ring edge of the heat protection ring is raised and presses against a conical wall section of the nozzle body. As a result, the heat protection ring is centered directly on the nozzle body.
  • the outer ring edge of the heat protection ring can serve as an additional sealing element downstream of the inner ring edge.
  • FIGS. 1 to 3 each show one of the exemplary embodiments on the basis of a section through the end of an injection nozzle on the combustion chamber side.
  • 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 delimiting the stroke of the valve needle are by a union nut 12 clamped 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 body 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 reference number 20, bears.
  • an annealing insert designated as a whole by reference number 20, bears.
  • the latter has a filament 22 designed as a wire coil, 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 22, but cause an injector effect, through which air is sucked from the combustion chamber into the interior of the incandescent body 22.
  • the incandescent body 22 is surrounded by a metallic sleeve 30, which has a cylindrical section 32 of larger diameter and a cylindrical section 34 of smaller diameter.
  • the transition between the sections 32, 34 is formed by a flange section 36, which rests on the support shoulder 18 of the union nut 12.
  • the smaller section 34 is provided at the end with an inwardly directed annular collar 38, on which the incandescent body 22 is supported and soldered in the center.
  • the union nut 12 Downstream of the Support shoulder 18, the union nut 12 is provided with a bore portion 40 which fits around the portion 34 of the sleeve.
  • An annular collar 42 adjoins the bore section 40 and overlaps the end of the sleeve 30 and the incandescent body 22 on the combustion chamber side in a protective manner.
  • a first annular insulating body 44, a metallic contact disk 46, a second annular insulating body 48 and a metallic retaining ring 50 are inserted one after the other into the larger cylindrical section 32 of the sleeve 30.
  • the insulating body 44 lies on the flange part 36 and. the parts 44 to 50 are centered on the outside by the sleeve 30.
  • the upstream end of the incandescent body 22 is soldered to the contact disk 46, which has an inner flanged edge 52 for centering the incandescent body 22.
  • the contact disk 46 is provided with a connecting lug 54 which passes through a circumferential recess in the sleeve 30, projects into a transverse bore 56 of the union nut 12 and is used to fasten a connecting cable.
  • the insulating bodies 44 and 48 are preferably made of a ceramic material and the terminal lug 54 of the contact disk 46 is preferably surrounded by an insulating covering.
  • three millings 57 are provided which are uniformly distributed over the circumference, via which the sucked-in air reaches the annular space 58 formed between the sleeve 30 and the incandescent body 22 and from there via the interstices between the turns into the interior of the incandescent body 22.
  • a metal heat protection ring 60 is clamped deformed between the holding ring 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, is supported on the retaining ring 50.
  • the outer ring edge 66 of the heat protection ring 60 is drawn conically upwards and lies against the conical wall section 14 of the nozzle body 10. As a result, the heat protection ring 60 is centered on the nozzle body 10 and the passage 24 and the annular space 58 are properly sealed against the chamber 68 surrounding the heat protection ring 60.
  • the parts 44 to 50 are soldered or glued to one another and to the sleeve 30, so that they can be handled as an independent structural unit before the injection nozzle is assembled.
  • This assembly is inserted into the union nut 12 from the upstream side 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 assembly of the injection nozzle is then advantageously carried out so that the nozzle holder, the washer and the nozzle body 10 are placed one on top of the other, 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, the tensing heat protection ring 60 is held centered on the nozzle body 10.
  • the parts 44 to 50 can first be held in the sleeve 30 only by frictional engagement without being connected to one another will.
  • the parts are then pressed by the tensing heat protection ring 60 against the flange part 36 of the sleeve and this against the support shoulder 18, so that, if necessary, also on an additional operation for firmly connecting the sleeve 30 to the union nut 12 can be dispensed with.
  • the embodiment described has the advantage that the clamping force of the heat protection ring 60 is positively absorbed by the support shoulder 18 without an annular body having to be additionally welded onto the union nut 12.
  • the power supply element required for contacting the incandescent body 22, namely the connecting lug 54, does not need to be passed through a bore in the union nut 12, which would have to be carefully sealed against the combustion chamber by melting glass or the like.
  • the insulating body 44, 48 can be dimensioned so wide that there is a perfect seal to the metallic parts 30, 46, 50 and the surface pressure remains within acceptable limits.
  • the incandescent body 22 is precisely centered on the sleeve 30 and the contact disk 46 and fastened centrally.
  • the glow insert 20 consists overall of simple parts that are easy to control and assemble in manufacture.
  • FIGS. 2 and 3 are essentially the same with regard to the nozzle body, the union nut, the heat protection ring and the insulating body the embodiment described above, so that the same reference numerals are used for these parts.
  • a sleeve 70 is provided which lies with a flange edge 72 on the support shoulder 18 of the union nut 12.
  • the lower insulating body 44 is centered here by an inner annular collar 74 of the sleeve 30, which projects above the flange edge 72 upwards.
  • the upper insulating body 48 is centered by a retaining ring 76 with an L-shaped cross section, which with its cylindrical leg 78 engages over both insulating bodies 48 and 44.
  • the sleeve 70 has an inwardly and slightly obliquely downwardly directed annular collar 80, which is provided with bores 82 for the passage of air into the interior of the sleeve 70.
  • a contact disk 84 is clamped between the insulating bodies 44, 48 and differs from the embodiment according to FIG. 1 essentially only by bores 86.
  • an incandescent body 88 is held, which is designed as a wire coil, which is tapered toward the nozzle body 10.
  • the axes of the bores 82 run approximately parallel to the adjacent surface line of the incandescent body 88.
  • the diameter of the insulating bodies 44, 48 can be increased compared to the embodiment according to FIG. 1, as a result of which the thermal load on the insulating bodies 44, 48 or the connection points between the insulating bodies and the contact disk 84 is reduced.
  • the design has the advantage that the union nut 12 can enclose the sleeve 70 under the flange edge 72 over a greater axial length than in the exemplary embodiment according to FIG. 1, as a result of which the assembly is facilitated and the heat dissipation from the sleeve 70 is improved.
  • the conically shaped incandescent body 88 has a better dynamic behavior than a cylindrical incandescent filament, which reduces the risk of breakage.
  • the conical design of the incandescent body 88 achieves a better adaptation to the spray jet shape and a further reduction in the thermal load on the insulating bodies 44, 48.
  • the air supply to the spray jets is further improved by the widening of the annular space between the incandescent body 88 and the surrounding parts in the upper region of the incandescent body 84, and by the additional bores 86 in the contact disk 84.
  • the incandescent body of which consists of a ceramic sleeve which is provided on its outer or inner surfaces with e.g. printed heating conductors is provided.
  • the injection nozzle according to FIG. 3 has a sleeve 90 which is firmly crimped into the union nut 12 between the support shoulder 18 and an end wall 92.
  • the sleeve 90 is provided on the combustion chamber side with an inner annular collar 94, on which a glow element 88 which corresponds to the embodiment according to FIG. 2 is supported and fastened in the center.
  • Bores 96 are provided in the annular collar 94 for the passage of the sucked-in air and are aligned parallel to the axis of the injection nozzle.
  • the insulating bodies 44, 48, a contact disk 97 and a flat metallic holding disk 98 are firmly connected to one another and to the sleeve 90 and without further trated.
  • the outer ring edge of the contact disk 97 is continuously raised and connected to a plurality of power supply lines 99 which are distributed uniformly over the circumference.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP85115988A 1985-01-23 1985-12-14 Injecteur de carburant pour moteurs à combustion interne Expired EP0188745B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502109 DE3502109A1 (de) 1985-01-23 1985-01-23 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3502109 1985-01-23

Publications (3)

Publication Number Publication Date
EP0188745A2 true EP0188745A2 (fr) 1986-07-30
EP0188745A3 EP0188745A3 (en) 1987-04-15
EP0188745B1 EP0188745B1 (fr) 1989-03-15

Family

ID=6260524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115988A Expired EP0188745B1 (fr) 1985-01-23 1985-12-14 Injecteur de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0188745B1 (fr)
JP (1) JPS61169655A (fr)
DE (2) DE3502109A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188744A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne
GB2190960A (en) * 1986-05-23 1987-12-02 Bosch Gmbh Robert Incandescent igniters for fuel injected internal combustion engines
GB2158513B (en) * 1984-05-11 1989-03-08 Barkas Werke Veb Glow plug in an internal combustion engine
EP0269641B1 (fr) * 1986-05-23 1989-10-11 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
EP0298962B1 (fr) * 1986-03-22 1990-05-16 Robert Bosch Gmbh Systeme d'injection de carburant dans des chambres de combustion d'un moteur a combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0530269U (ja) * 1991-09-25 1993-04-20 株式会社イナツクス 水 栓

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion
EP0140148A2 (fr) * 1983-10-03 1985-05-08 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans les chambres de combustion de 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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion
EP0140148A2 (fr) * 1983-10-03 1985-05-08 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans les chambres de combustion de 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

Cited By (9)

* 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
EP0188744A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
EP0188744B1 (fr) * 1985-01-23 1988-10-12 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
EP0298962B1 (fr) * 1986-03-22 1990-05-16 Robert Bosch Gmbh Systeme d'injection de carburant dans des chambres de combustion d'un moteur a combustion interne
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne
US4821696A (en) * 1986-05-09 1989-04-18 Robert Bosch Gmbh Device for injecting fuel into a combustion chamber of an internal combustion engine
GB2190960A (en) * 1986-05-23 1987-12-02 Bosch Gmbh Robert Incandescent igniters for fuel injected internal combustion engines
EP0269641B1 (fr) * 1986-05-23 1989-10-11 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
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

Also Published As

Publication number Publication date
JPS61169655A (ja) 1986-07-31
DE3568829D1 (en) 1989-04-20
EP0188745A3 (en) 1987-04-15
EP0188745B1 (fr) 1989-03-15
DE3502109A1 (de) 1986-07-24

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