EP0188746A2 - Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne - Google Patents

Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne Download PDF

Info

Publication number
EP0188746A2
EP0188746A2 EP85115989A EP85115989A EP0188746A2 EP 0188746 A2 EP0188746 A2 EP 0188746A2 EP 85115989 A EP85115989 A EP 85115989A EP 85115989 A EP85115989 A EP 85115989A EP 0188746 A2 EP0188746 A2 EP 0188746A2
Authority
EP
European Patent Office
Prior art keywords
contact
union nut
nozzle
combustion chamber
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
EP85115989A
Other languages
German (de)
English (en)
Other versions
EP0188746B1 (fr
EP0188746A3 (en
Inventor
Bernhard Dipl.-Ing. Kaczynski
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 EP0188746A2 publication Critical patent/EP0188746A2/fr
Publication of EP0188746A3 publication Critical patent/EP0188746A3/de
Application granted granted Critical
Publication of EP0188746B1 publication Critical patent/EP0188746B1/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 contact element is designed as a soldering point on a nozzle holder or a union nut of the injection nozzle or as a bare wire end or as a cable lug of a cable tail and connected to a conductor leading to the incandescent body, which is pressure-tight passed through the union nut or through a flange part carrying the glow body and clamped between the injection nozzle and a shoulder of the machine housing and to which a connection end of the glow body is soldered directly or via a further contact element.
  • the arrangement of a soldering support has the disadvantage that when removing the injection nozzle for the purpose of replacing the nozzle body or adjusting the injection pressure must be soldered.
  • a cable tail on the injection nozzle or a flange part carrying the glow plug difficult assembly if it emerges laterally from the union nut or the flange part and has to be passed through a hole in the machine housing.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that both a soldering point and a cable tail on the injection nozzle or on a flange part carrying the glow element is omitted and the external heating current supply by simple screwing, clamping or the like Contact ring trained contact element can be connected.
  • the contact ring is fastened on the union nut upstream of a screw-in thread.
  • the contact ring is accessible from all sides, even with a built-in injector, so that its entire contact area by Ver Use of clamps or the like can be used to make contact.
  • the mating contact element connected to the external heating current supply can be a contact pin, which is arranged radially to the injection nozzle in a bore in the machine housing and which presses resiliently or clamped against the contact ring.
  • the contact ring is expediently provided with a contact tab which projects into the area of a wall opening in the union nut and is connected there to a conductor element leading to the incandescent body.
  • FIG. 1 shows an enlarged partial longitudinal section through the injection nozzle of the first exemplary embodiment
  • FIG. 2 shows an enlarged partial longitudinal section through the second exemplary 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 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, 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 bushing 32 which fits 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 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 formed over part of its length as a sleeve 68, 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 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 an insulating coating 84.
  • a pressure ring 88 is arranged between the clamping shoulder 78 of the union nut 14 and an annular shoulder 86 of the nozzle body 10, via which the union nut 14 clamps the nozzle body 10 and the intermediate disk 12 against the nozzle holder 16.
  • 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 covering and extends over two 120 ° divisions and e.g. 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 an insulating sleeve 98, which in turn is made of insulating material above the screw thread 66 is positively attached to the union nut 14.
  • 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. Then the glow insert 24 together with the conductor element 62 and the pressure ring 88 is 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 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. 2 has a union nut 102 which grips the nozzle body 10 and which, downstream of its screw-in thread 104, carries a contact ring 106 composed of two halves. This is embedded in an insulating body 108 which is formed in an annular groove on the circumference of the union nut 102.
  • Each half of the contact ring 106 is provided with an axially directed contact lug 110, which projects into the area of a wall opening 112 of the union nut 102 and is connected there to an extension 114 of a contact disk 116, which, moreover, is formed like the contact disk 46 of the first exemplary embodiment and in one into the cap nut 102 insert 24a is integrated.
  • a contact pin 120 is provided, which is seated in a clamping nut 122, which is screwed into a threaded bore arranged radially to the receiving bore for the injection nozzle in the cylinder head 124 of the machine.
  • the contact pin 120 has an annular collar 126 which bears against an annular shoulder 130 of the clamping nut 122 with the interposition of an insulating disk 128.
  • an insulating bush 132 bears against the collar 126, against which a threaded piece 134 screwed into the head of the clamping nut 122 presses.
  • the contact pin 120 is fixed in the clamping nut 12 in an insulated manner via the threaded piece 134, and the necessary contact pressure between the contact pin 120 and the contact ring 106 is generated by tightening the clamping nut 122.
  • the heating current supply can be fastened to the end section of the contact pin 120 which projects freely from the clamping nut 122 by means of known connecting elements.
  • the incandescent body 26 and the parts serving to hold and contact it, including the contact ring 106, could also be arranged on a component which is designed separately from the union nut 102 and which is located between the union nut 102 and a shoulder 136 of the cylinder head 124 is clamped.
  • This variant is indicated in FIG. 2 by the dashed lines 138.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP85115989A 1985-01-23 1985-12-14 Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne Expired EP0188746B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502112 DE3502112A1 (de) 1985-01-23 1985-01-23 Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3502112 1985-01-23

Publications (3)

Publication Number Publication Date
EP0188746A2 true EP0188746A2 (fr) 1986-07-30
EP0188746A3 EP0188746A3 (en) 1987-04-15
EP0188746B1 EP0188746B1 (fr) 1989-04-26

Family

ID=6260527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115989A Expired EP0188746B1 (fr) 1985-01-23 1985-12-14 Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0188746B1 (fr)
JP (1) JPS61169658A (fr)
DE (2) DE3502112A1 (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
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
FR2598465A1 (fr) * 1986-05-09 1987-11-13 Bosch Gmbh Robert Injecteur de carburant pour moteurs a combustion interne a dispositif de prechauffage dont l'anneau calorifuge protege le corps d'injecteur.
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
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2801003B2 (ja) * 1987-06-26 1998-09-21 株式会社日立製作所 有機物除去装置
DE3731231A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245589A (en) * 1978-07-18 1981-01-20 Ryan Joseph C Exothermic injector adapter
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245589A (en) * 1978-07-18 1981-01-20 Ryan Joseph C Exothermic injector adapter
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
DE3307109A1 (de) * 1982-08-14 1984-03-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume von insbesondere selbstzuendenen brennkraftmaschinen
GB2131539A (en) * 1982-12-02 1984-06-20 Lucas Ind Plc Electric starting aids for internal combustion engines

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
EP0188745A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
EP0188744B1 (fr) * 1985-01-23 1988-10-12 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
EP0188745B1 (fr) * 1985-01-23 1989-03-15 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
FR2598465A1 (fr) * 1986-05-09 1987-11-13 Bosch Gmbh Robert Injecteur de carburant pour moteurs a combustion interne a dispositif de prechauffage dont l'anneau calorifuge protege le corps d'injecteur.
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

Also Published As

Publication number Publication date
EP0188746B1 (fr) 1989-04-26
DE3569783D1 (en) 1989-06-01
DE3502112A1 (de) 1986-07-24
EP0188746A3 (en) 1987-04-15
JPS61169658A (ja) 1986-07-31

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