EP0140148A2 - Dispositif pour l'injection de carburant dans les chambres de combustion de moteurs à combustion interne - Google Patents

Dispositif pour l'injection de carburant dans les chambres de combustion de moteurs à combustion interne Download PDF

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Publication number
EP0140148A2
EP0140148A2 EP84111313A EP84111313A EP0140148A2 EP 0140148 A2 EP0140148 A2 EP 0140148A2 EP 84111313 A EP84111313 A EP 84111313A EP 84111313 A EP84111313 A EP 84111313A EP 0140148 A2 EP0140148 A2 EP 0140148A2
Authority
EP
European Patent Office
Prior art keywords
injection nozzle
heating element
resistance
union nut
disc
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
EP84111313A
Other languages
German (de)
English (en)
Other versions
EP0140148A3 (en
EP0140148B1 (fr
Inventor
Gerhard Auwärter
Werner Dr. Dipl.-Phys. Grünwald
Ernst Imhof
Iwan Komaroff
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 EP0140148A2 publication Critical patent/EP0140148A2/fr
Publication of EP0140148A3 publication Critical patent/EP0140148A3/de
Application granted granted Critical
Publication of EP0140148B1 publication Critical patent/EP0140148B1/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
    • 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 device for injecting fuel according to the preamble of the main claim.
  • Devices of this type have the advantage that braking of the spray jet due to the formation of negative pressure and beam deformation in the channel of the incandescent body can be avoided in practically all operating points of the internal combustion engine, so that the spray jets emerge from the channel with the desired geometry and without brakes at the maximum outflow speed.
  • the air drawn into the duct heats up and penetrates into the peripheral zones of the spray jets, where, in contrast to the core zone, there are finer fuel droplets and, because of the smaller droplet density than in the jet core, there is a very favorable fuel-air ratio for ignition and combustion.
  • the arrangement of a glow element near the front end of the injection nozzle on the combustion chamber side could lead to the problem that the injection openings in this end end tend to coke faster than in the case of injection nozzles without an incandescent element due to the additional heat.
  • the main patent already proposes to provide a heat shield between the injection nozzle and the incandescent body, which can carry a metallic heat protection ring from case to case. is provided with an annular lip pressing against the end face of the injection nozzle for dissipating the heat. This arrangement is not sufficient in all cases to reliably prevent an undesirably strong heating of the end of the injection nozzle on the combustion chamber side if the glow body radiates too much heat to the nozzle base.
  • the arrangement according to the invention with the characterizing features has the advantage that effective protection of the injection nozzle against overheating by the incandescent body can be achieved even in extreme cases with simple means.
  • the electrical resistance with PTC characteristic increases with increasing temperature at the end face of the injection nozzle, with the heating current increasing throttled and a harmless limit temperature is adjusted as a result. At the same time, the heating element itself is protected against overload and its service life is increased.
  • the electrical resistance can advantageously have an exponential course of the resistance value in the still permissible limit temperature range.
  • the resistor acts to a certain extent as a switch, which switches the heating current on and off in accordance with the heat radiation directed against the injection nozzle.
  • the permissible limit temperature can be maintained more precisely than with resistors whose resistance value changes continuously with the temperature.
  • the electrical resistance is designed as a disk-shaped body, which is arranged between the heating element and the combustion chamber end of the injection nozzle is particularly advantageous.
  • the disk-shaped resistance body additionally acts as a mechanical shield for the injection nozzle against the heat radiation of the incandescent body.
  • the injection nozzle 10 has a nozzle body 12 in which a valve seat 14 is formed and a valve needle 16 is slidably mounted. This has a sealing cone 18 which cooperates with the valve seat 14, to which a throttle pin 20 connects, which plunges into a spray opening 22 in the nozzle body 12.
  • the spray opening 22 opens out at the end face 24 of the injection nozzle facing the combustion chamber, which ends via a conical wall section 26 into the cylindrical outer surface of the nozzle body 12.
  • the nozzle body 12 is clamped by a union nut 28 together with an intermediate washer 30, as usual, to a nozzle holder, which is no longer shown in the drawing, which has a connection for a fuel line and is provided on the inside with a chamber for receiving a closing spring which holds the valve needle 16 presses against valve seat 14.
  • the union nut 28 is adapted to the outer shape of the nozzle body 12 and is accordingly provided with a conical bore section 31.
  • a fuel channel leads from the nozzle holder through the intermediate disk 30 into an annular groove 32 in the nozzle body 12, which is connected via an inlet bore 34 to a pressure chamber 36 in the nozzle body 12.
  • the valve needle 16 In the area of the pressure chamber 36, the valve needle 16 has a pressure shoulder 38, on which the fuel pressure causes a force which counteracts the closing spring and displaces the valve needle in the opening direction.
  • the injection nozzle 10 is followed by an incandescent body, designated as a whole by the reference number 4c, which, as the central component, has an incandescent filament 42 which has a channel in its interior for the non-contact passage of the fuel spray jets.
  • the filament 42 is surrounded by a metallic protective capsule 44, which is provided with a flange edge 46 and with lateral ventilation openings 48 in the casing, and with a central through opening 50 in the bottom.
  • the spray jets passing through the incandescent filament 42 suck in air from the combustion chamber of the machine via the ventilation openings as a result of the injection effect, which mixes in the incandescent filament 42 with the edge zones of the spray jets in the manner already described at the beginning.
  • a disk-shaped electrical resistance body 52 Arranged between the injection nozzle 10 and the incandescent body 40 is a disk-shaped electrical resistance body 52 which is electrically connected in series with the incandescent filament 42 in the manner described in more detail below.
  • the resistance body 52 consists of ceramic material, e.g. B. from BaTiO 3 , and is covered on both sides with a ceramic fleece 54 and 56 so that contact with the union nut 28 and the flange 46 of the protective capsule 44 is avoided.
  • the ceramic nonwovens 54 and 56 consist of an electrically non-conductive material, for. B. from A1 2 0 3 .
  • the protective capsule 44 and the resistance body 52 are held together by a ring part 60 provided with a support shoulder 58 on the union nut 28.
  • the ring part 60 is welded to the union nut 28 and a supply line 64 for the incandescent filament 42, which is contained in an insulating bush 62, is clamped pressure-tight between the two parts.
  • the upstream of the insulating bushing 62 which is covered by an insulating jacket 66, is passed through a laterally open slot 68 in the union nut 28 and on the upper side ten Chemistry of the metallized resistance body 52 welded on both sides.
  • One end of the incandescent filament 42 is welded to the lower side surface of the resistance body 52, while its other end is connected to the metallic protective capsule 44 and is contacted via this, the ring part 60, the union nut 28 and the cylinder head with ground.
  • the resistance body 52 practically interrupts the heating current of the incandescent filament 42 simply by the heat radiation from the combustion chamber, so that the incandescent filament 42 is only switched on in the start phase.
  • the resistance body 52 In addition to its control function, the resistance body 52 largely shields the end face 24 of the nozzle body 12 from the combustion chamber.
  • the resistance body 52 thus performs two functions simultaneously in the selected exemplary embodiment, both of which serve one and the same task.
  • This design also has the advantage that the resistance body 52 with the filament 42, the protective capsule 44 and the lead 64 can be assembled into a prefabricated assembly prior to installation in the injector 10, thereby facilitating the assembly of the injector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
EP84111313A 1983-10-03 1984-09-22 Dispositif pour l'injection de carburant dans les chambres de combustion de moteurs à combustion interne Expired EP0140148B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3335920A DE3335920A1 (de) 1983-10-03 1983-10-03 Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
DE3335920 1983-10-03

Publications (3)

Publication Number Publication Date
EP0140148A2 true EP0140148A2 (fr) 1985-05-08
EP0140148A3 EP0140148A3 (en) 1986-12-03
EP0140148B1 EP0140148B1 (fr) 1988-07-13

Family

ID=6210847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111313A Expired EP0140148B1 (fr) 1983-10-03 1984-09-22 Dispositif pour l'injection de carburant dans les chambres de combustion de moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0140148B1 (fr)
JP (1) JPS6095185A (fr)
DE (2) DE3335920A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188745A3 (en) * 1985-01-23 1987-04-15 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
WO1987005663A1 (fr) * 1986-03-22 1987-09-24 Robert Bosch Gmbh Systeme d'injection de carburant dans des chambres de combustion d'un moteur a combustion interne
WO1987007335A1 (fr) * 1986-05-23 1987-12-03 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
DE3724092A1 (de) * 1987-07-21 1989-02-02 Bosch Gmbh Robert Vorrichtung zur kraftstoffeinspritzung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615636A1 (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
DE4224344A1 (de) * 1992-07-23 1994-01-27 Bayerische Motoren Werke Ag Mit einer Glühvorrichtung kombinierte Einspritzdüse für luftverdichtende Einspritzbrennkraftmaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE834467C (de) * 1949-08-14 1954-08-16 Wehrmann Motoren Ing Zimmer & Brennkraftmaschine mit Brennstoffeinspritzung und Selbstzuendung
JPS5453714A (en) * 1977-10-06 1979-04-27 Toyota Motor Corp Internal combustion engine fuel injector
DE3307109A1 (de) * 1982-08-14 1984-03-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume von insbesondere selbstzuendenen brennkraftmaschinen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188745A3 (en) * 1985-01-23 1987-04-15 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
WO1987005663A1 (fr) * 1986-03-22 1987-09-24 Robert Bosch Gmbh Systeme d'injection de carburant dans des chambres de combustion d'un moteur a combustion interne
WO1987007335A1 (fr) * 1986-05-23 1987-12-03 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
US4834043A (en) * 1986-05-23 1989-05-30 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
DE3724092A1 (de) * 1987-07-21 1989-02-02 Bosch Gmbh Robert Vorrichtung zur kraftstoffeinspritzung

Also Published As

Publication number Publication date
EP0140148A3 (en) 1986-12-03
EP0140148B1 (fr) 1988-07-13
DE3335920A1 (de) 1985-04-18
DE3472701D1 (en) 1988-08-18
JPS6095185A (ja) 1985-05-28

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