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WO2003027483A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

Info

Publication number
WO2003027483A1
WO2003027483A1 PCT/DE2002/002161 DE0202161W WO03027483A1 WO 2003027483 A1 WO2003027483 A1 WO 2003027483A1 DE 0202161 W DE0202161 W DE 0202161W WO 03027483 A1 WO03027483 A1 WO 03027483A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
injection valve
openings
fuel
valve according
Prior art date
Application number
PCT/DE2002/002161
Other languages
German (de)
English (en)
Inventor
Jürgen RAIMANN
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 WO2003027483A1 publication Critical patent/WO2003027483A1/fr

Links

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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/045—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the combustion chamber

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a 'fuel injection system for • a mixture-compressing, spark-ignition internal combustion engine which - comprises a fuel injection valve, which injects fuel into a combustion chamber formed by a piston / cylinder construction, and is provided with a spark plug projecting into the combustion chamber is.
  • the fuel injector is provided with at least one row of injection holes distributed over the circumference of the fuel injector. Through a targeted injection of fuel via the injection holes a strahlge 'Convicted combustion process is realized by forming a mixture cloud with at least one beam.
  • a disadvantage of the fuel injector known from the above-mentioned document is, in particular, the coking of the spray openings, which thereby clog and reduce the flow through the fuel injector to an unacceptably large extent. This leads to malfunctions of the internal combustion engine.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a flame protection capsule arranged downstream of the spray openings reduces the temperature of the flame front of the mixture cloud in the area of the spray openings so much that no combustion residues can precipitate on the valve seat body, causing an overgrowth the spray openings are avoided by coking residues.
  • the flame-retardant capsule comprises a number of passage openings which are arranged and dimensioned such that the flame-retardant capsule is not wetted by fuel and the injection process is not hindered.
  • the preferred partial spherical shape of the flame retardant capsule allows maximum coking protection to be achieved with minimal disruption to the injection process.
  • the flame-retardant capsule can also be arranged at the mouth of a receiving bore in the cylinder head of the internal combustion engine that receives the fuel injection valve, as a result of which the sensitivity of the flame-retardant function decreases from the installation depth of the fuel injector.
  • Fig. 2A shows a schematic section through the spray-side part of the part shown in FIG. 1 illustrated embodiment of the invention
  • Fig. 2B is a bottom view of the flame-retardant capsule according to the invention against the flow direction in FIG. 2A.
  • Fig. 1 shows an embodiment, in a partial sectional view of a ⁇ he indungshielen
  • Fuel injector 1 The fuel injection valve 1 is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
  • Fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is, for example, in operative connection with a valve closing body 4, which is arranged on a valve seat body 5 via a weld seam 41 Valve seat surface 6 cooperates to form a sealing seat.
  • fuel injector 1 is an inward opening fuel injector 1, which in the present example has six spray orifices 7.
  • the nozzle body 2 is sealed by a seal .8 against an outer pole 9 of a solenoid 10 acting as an actuator for the valve needle 3.
  • the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10.
  • the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on a connecting component 29.
  • the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
  • a paired adjusting disk 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected to the valve needle 3 via a first flange 21, which is connected by a.
  • Weld 22 is connected to the first flange 21.
  • a restoring spring 23 is supported on the first flange 21, which in the present design of the fuel injector 1 is preloaded by a sleeve 24.
  • a second flange 31 is arranged on the downstream side of the armature 20 and serves as a lower armature stop. It is non-positively connected to the valve needle 3 via a weld 33.
  • An elastic intermediate ring 32 is arranged between the armature 20 and the second flange 31 for damping armature bumpers when the fuel injector 1 closes.
  • Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and on the valve seat body 5.
  • the fuel ⁇ is supplied via a central fuel supply 16 ′ and filtered by a filter element 25.
  • the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
  • the fuel injection valve 1 has a flame protection capsule 36 on the valve seat body 5, which is arranged in a recess 34 of the nozzle body 2 and is connected to it, for example, by means of a weld 35, which is attached to the outflow side of the spray openings 7.
  • the flame retardant capsule 36 reduces the tendency to coke due to its arrangement on the outflow side of the spray openings 7 and thus prevents malfunctions of the fuel injector 1 by clogging the spray openings 7 and an impermissible reduction in the fuel flow.
  • An injection-side end 37 of the fuel injection valve 1 with the measures according to the invention is shown in more detail in FIGS. 2A and 2B.
  • the first flange 21 on the valve needle 3 is acted upon by the return spring 23 against a lifting direction in such a way that the valve closing body 4 on the valve seat 6 is held in sealing contact.
  • the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 in the stroke direction against the spring force of the return spring 23.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus also the valve needle 3 in the lifting direction.
  • the valve closing body 4 which is operatively connected to the valve needle 3, lifts off the valve seat surface 6, as a result of which the fuel is sprayed off at the spray openings 7. If the coil ' current is switched off, the armature 20 drops from the inner pole 13 after the magnetic field is sufficiently reduced by the pressure of the return spring 23 on the first flange 21, as a result of which the valve needle 3 moves counter to the stroke direction. As a result, the valve closing body 4 rests on the valve seat surface 6, and the fuel injection valve 1 is closed.
  • the anchor 20 is based on the anchor stop formed by "the second flange 31.
  • FIG. 2A shows an excerpted sectional view of FIG . 1 marked with IIA from the exemplary embodiment shown in FIG. 1 of a fuel injector 1 designed according to the invention.
  • the valve seat body 5 in the exemplary embodiment has a flame-retardant capsule 36 on an outflow-side end face -38 facing the combustion chamber (not shown further).
  • the flame-retardant capsule 36 is either partially spherical and has a diameter which is, for example, between a quarter of the diameter of the nozzle body 2 and three times the diameter of the nozzle body 2.
  • the flame-retardant capsule 36 can also be adapted to the contour of the stro downward end of the fuel injector 1 and be arranged at a distance of the flame-retardant capsule 36 from the fuel injection valve 1 between 0.1 mm and 1.0 mm.
  • the flame retardant capsule 36 includes openings 39 which, in number to the 'discharge orifices 7 corresponds.
  • the flame retardant capsule 36 has six passage openings 39.
  • the passage openings 39 are dimensioned so that the injection jets sprayed through the spray openings 7 are not hindered by the flame-retardant capsule 36. Accordingly, the size of the passage openings 39 can be, for example, between twice and ten times the diameter of the injection openings 7.
  • the positioning _der Passages 39 on the hemispherical flame-retardant capsule 36 must be adapted accordingly. -
  • the coking of the spray openings 7 can be reduced by the arrangement of the flame protection capsule 36 on the outflow side of the spray openings. Since the diameter of the spray orifices 7 is typically approximately 100 .mu.m, the risk that the spray orifices 7 become blocked by coking over time and thus the flow rate is impermissibly restricted is usually relatively great. This is particularly due to the high temperatures in the arc-through of the injected mixture cloud in the combustion chamber, as this component of the fuel 's of the tip of the fuel injector 1, to settle. By attaching the flame-retardant capsule 36, the surface temperature in the outlet area of the spray openings 7 can be reduced to such an extent that the spray openings 7 cannot increase due to coking residues. The flame retardant capsule 36 thereby preventing the propagation of the flame front in the area between the flame retardant capsule 36 and 'the valve seat body. 5
  • the flame protection capsule 36 has compensation openings 40. These are preferably arranged in the area of the partially spherical flame protection capsule 36 which adjoins the nozzle body 2 of the fuel injection valve 1.
  • the diameter of the compensation openings 40 is preferably between two and thirty times the diameter of the spray openings 7.
  • FIG 2B shows a bottom view against the flow direction of the fuel, the outflow end 37 of the fuel injection valve 1 according to the invention with the flame-retardant capsule 36 fixed thereon.
  • the flame-retardant capsule 36 has six passage openings 39 which are at regular angular intervals from one another An axis of the fuel injector 1 concentric circle are arranged. By an appropriate dimension . dimensioning of the 'through-openings 39, a wetting of the flame retardant capsule 36 prevents fuel.
  • the compensation openings 40 are also arranged on a circle concentric to the axis of the fuel injection valve 1 upstream of the passage openings 39, with one compensation opening 40 and one passage opening 39 each being arranged on a length circle of the partially spherical flame-retardant capsule 36. Depending on the requirements of the mixture cloud to be injected, this arrangement can also be offset or changed in a different number of openings 39 and 40.
  • the flame protection capsule 36 is due to its simple
  • Spray openings 7 are adaptable, which have, for example, more or less or unevenly arranged spray openings 7.
  • the flame-retardant capsule 36 is mount not in the outflow-side end 37 of the fuel injection valve 1, but in the combustion chamber of the internal combustion engine above the mouth of a receiving bore, not shown, of a cylinder head of the internal combustion engine, not shown, in which the fuel injection valve 1 is mounted.
  • the advantage here is that the flame protection function is independent of the installation depth of the fuel injector 1 in the cylinder head.
  • Passage openings 39 in the flame protection capsule 36 may only be dimensioned such that a slight change in the distance between the spray openings 7 and the passage openings 39 does not lead to wetting of the flame protection capsule 36 and to a disruption of the injection process.
  • the invention is not limited to the exemplary embodiments shown and can be used for any construction of fuel injection valves 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Soupape (1) d'injection de carburant pour des systèmes d'injection de carburant de moteurs à combustion interne, qui comporte un actionneur, une aiguille (3) de soupape actionnée par l'actionneur et destinée à déplacer un obturateur (4) de soupape formant un siège étanche avec une surface (6) de siège de soupape formée sur le corps (5) de siège de soupape, et plusieurs orifices d'injection (7) formés dans le corps (5) de siège de soupape. Une capsule de protection (36) contre les flammes, qui protège les orifices d'injection (7) contre la chambre de combustion du moteur à combustion interne, est située sur une extrémité (42), côté écoulement, de la soupape (1) d'injection de carburant.
PCT/DE2002/002161 2001-08-29 2002-06-13 Soupape d'injection de carburant WO2003027483A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001142300 DE10142300A1 (de) 2001-08-29 2001-08-29 Brennstoffeinspritzventil
DE10142300.4 2001-08-29

Publications (1)

Publication Number Publication Date
WO2003027483A1 true WO2003027483A1 (fr) 2003-04-03

Family

ID=7696979

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/002161 WO2003027483A1 (fr) 2001-08-29 2002-06-13 Soupape d'injection de carburant

Country Status (2)

Country Link
DE (1) DE10142300A1 (fr)
WO (1) WO2003027483A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR699734A (fr) * 1929-08-03 1931-02-19 Perfectionnements aux atomiseurs de combustible pour moteurs à combustion interne
US2068678A (en) * 1935-02-09 1937-01-26 Raymond H Hoadley Injection valve tip
DE3113466A1 (de) * 1981-04-03 1982-10-14 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zum befestigen einer kappe an einem duesenkoerper
US4434940A (en) * 1980-02-05 1984-03-06 Klockner-Humboldt-Deutz Ag Insulated fuel injection nozzle device and method for manufacturing same
JPH05149214A (ja) * 1991-11-27 1993-06-15 Isuzu Motors Ltd 遮熱構造の噴射ノズル
DE19804463A1 (de) 1998-02-05 1999-08-12 Daimler Chrysler Ag Kraftstoffeinspritzsystem für Ottomotoren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03160151A (ja) * 1989-11-15 1991-07-10 Aisan Ind Co Ltd 電磁式燃料噴射弁
DE4442350A1 (de) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Zerstäubungssieb und Brennstoffeinspritzventil mit einem Zerstäubungssieb
US5437413A (en) * 1994-03-24 1995-08-01 Siemens Automotive L.P. Multiple disk air assist atomizer for fuel injection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR699734A (fr) * 1929-08-03 1931-02-19 Perfectionnements aux atomiseurs de combustible pour moteurs à combustion interne
US2068678A (en) * 1935-02-09 1937-01-26 Raymond H Hoadley Injection valve tip
US4434940A (en) * 1980-02-05 1984-03-06 Klockner-Humboldt-Deutz Ag Insulated fuel injection nozzle device and method for manufacturing same
DE3113466A1 (de) * 1981-04-03 1982-10-14 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zum befestigen einer kappe an einem duesenkoerper
JPH05149214A (ja) * 1991-11-27 1993-06-15 Isuzu Motors Ltd 遮熱構造の噴射ノズル
DE19804463A1 (de) 1998-02-05 1999-08-12 Daimler Chrysler Ag Kraftstoffeinspritzsystem für Ottomotoren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 544 (M - 1489) 30 September 1993 (1993-09-30) *

Also Published As

Publication number Publication date
DE10142300A1 (de) 2003-03-20

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