EP1223336A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1223336A1
EP1223336A1 EP02000738A EP02000738A EP1223336A1 EP 1223336 A1 EP1223336 A1 EP 1223336A1 EP 02000738 A EP02000738 A EP 02000738A EP 02000738 A EP02000738 A EP 02000738A EP 1223336 A1 EP1223336 A1 EP 1223336A1
Authority
EP
European Patent Office
Prior art keywords
fuel
gap
valve needle
fuel injection
section
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
EP02000738A
Other languages
German (de)
English (en)
Other versions
EP1223336B1 (fr
Inventor
Hubert Stier
Norbert Keim
Dieter Etzel
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 EP1223336A1 publication Critical patent/EP1223336A1/fr
Application granted granted Critical
Publication of EP1223336B1 publication Critical patent/EP1223336B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • Fuel injectors with a nozzle body the one Has recess that from a valve needle to a sealing seat is penetrated are known.
  • DE 196 25 059 A1 is a fuel injector shown in which between the valve needle and the Recess a gap is formed. Through this gap the fuel flows to an opening in the Nozzle body from which the fuel enters a volume which is between the outside of the nozzle body and a Sleeve is formed. From there the fuel flows through Bores to the sealing seat that is in the nozzle body on his downstream end of a valve seat and one located at the downstream end of the valve needle Valve closing body is formed.
  • the recess in the Nozzle body on a radial extension in which the Valve needle is guided.
  • For flow guidance are on one radial expansion of the valve needle with the valve needle flats are appropriate.
  • the metering of the fuel to be sprayed off is carried out at the holes that the fuel is sprayed off in strands.
  • the Nozzle body has a bore at the upstream end in which the valve needle is guided.
  • the nozzle body also has a central hole, which is concentric with the valve needle arranged therein. At the one opens upstream end of the bore Supply hole, which is oblique to the central axis of the fuel injector and the gap between the valve needle and the central bore with Fuel supplied.
  • the central bore points in its downstream area an increase in the cross section, which is about extends half the length of the nozzle body.
  • a spring In this radial extended area is arranged a spring, the downstream end a guide disc on one at the used downstream end of the nozzle body Valve seat body presses.
  • At the downstream end of the Fuel injector is one in the valve seat body Valve seat surface introduced, downstream of it swirl-forming element is arranged.
  • a disadvantage of the specified fuel injection valves is the large volume that the fuel is up to Flow through trained throttle point.
  • the different functions to perform with the recess are, for example, the inclusion of the spring in the DE 198 15 795 A1, a very large volume is required, whereby the dynamic behavior of the Fuel injector is deteriorated.
  • the invention Fuel injector with the characteristic feature of the main claim the advantage that the central recess, in which the valve needle is arranged, no changing Has cross sections, causing the fuel flow would be disturbed. When opening the fuel injector therefore there is no unwanted overshoot of the fuel flow over the static Fuel flow out. The fuel flow forms spread out evenly, reducing flow losses be reduced.
  • the fuel injector 1 is in the form of a Fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited Running internal combustion engines.
  • the Fuel injector 1 is particularly suitable for not injecting fuel directly into one Shown combustion chamber of an internal combustion engine.
  • the fuel injection valve 1 comprises a nozzle body 2, in which a valve needle 3 is arranged.
  • the Valve needle 3 is with a valve closing body 4 in Active connection with one in a valve seat body 5 arranged valve seat surface 6 to a sealing seat interacts.
  • the fuel injector 1 is acting it is an electromagnetic in the exemplary embodiment actuated fuel injector 1, which via a Spray opening 7 has.
  • the nozzle body 2 is through a Seal 8 sealed against a lower end 9 of the housing.
  • a Magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which on a Inner pole 13 of the solenoid 10 is present.
  • the inner pole 13 and the housing end 9 are separated from one another by a gap 26 separated and are supported on a connecting component 29 from.
  • the solenoid 10 is connected via a line 19 from one can be supplied via an electrical plug contact 17 electrical current excited.
  • the plug contact 17 is one Surround plastic sheath 18 on the inner pole 13th can be molded.
  • the valve needle 3 is in a disc-shaped design Valve needle guide 14 out. This is one Paired shim 15, which for setting the Valve needle strokes.
  • On the upstream side of the Adjustment disk 15 is an anchor 20. This is standing non-positively via a flange 21 with the valve needle 3 in connection, which by a weld 22 with the Flange 21 is connected.
  • the flange 21 is supported a return spring 23, which in the present Design of the fuel injector 1 by one in the Inner pole 13 pressed sleeve 24 brought to bias becomes.
  • valve needle guide 14 in the armature 20 and one Guide disc 31 extend fuel channels 30a to 30c.
  • a Filter element 25 arranged in a central fuel supply 16 .
  • the fuel injector 1 is by a seal 28 against a not shown Sealed fuel line.
  • the fuel injector 1 has a central downstream of the valve needle guide 14 Recess 32 on. Closes at the central recess 32 there is a radial expansion on the upstream side 34a with the valve needle 3 and the downstream Side of the valve needle guide 14 an annular volume formed. At the downstream end of the recess 32 a radially widened region 35 also closes on. In the downstream radially widened area 35 the valve seat body 5 used. Upstream is one Guide disc 31 arranged in the flow guide Fuel channels 30c are introduced.
  • the Fuel channels 30c can also be designed as swirl channels be by using a tangential component for example in a valve body 4 surrounding Open swirl chamber.
  • a second one Volume 34b formed by the valve needle 3 Upstream of the guide disc 31 is a second one Volume 34b formed by the valve needle 3, the central recess 32 of the nozzle body 2 and the Guide disc 31 is limited.
  • Fuel injector 1 are volumes 34a and 34b to keep it as small as possible. With the volume 34b, this can for example, by the geometry of the valve needle 3 adapted shape can be achieved.
  • the fuel flows when open Fuel injector 1 through the fuel passages 30b into extension 34a.
  • the gap 33 has one over its entire length constant flow cross-section.
  • Gap 33 formed in the form of a hollow cylinder.
  • the Cross section is dimensioned so that the Fuel flow when fully open Fuel injector 1 experiences a slight throttling.
  • the fuel flows out of the Gap 33 in volume 34b. From there it gets through the Fuel channels 30c ultimately to the sealing seat and the Spray opening 7, from where the fuel in the Combustion chamber is hosed down.
  • the Fuel injector 1 When you open the fuel injector 1, the under Fuel under pressure from inside Fuel injector 1 in the combustion chamber Internal combustion engine relaxed. By the occurring Pressure difference build up inside the Fuel injector 1 different pressure ranges which continue in the fuel flow.
  • the Fuel is a medium that is not ideally incompressible, which is why the pressure fluctuations to density fluctuations of the Lead fuel.
  • the throttling effect of the long, thin gap 33 such pressure waves in the Dampened fuel flow and overshoot of the Fuel flow is prevented.
  • the whole Length L of the gap 33 is constant gap width d preferably larger than 0.2 mm and smaller than 0.4 mm.
  • the gap 33 can be non-circular over its entire length Cross-section, especially a slightly conical shape, exhibit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02000738A 2001-01-15 2002-01-12 Injecteur de carburant Expired - Lifetime EP1223336B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10101562 2001-01-15
DE10101562A DE10101562A1 (de) 2001-01-15 2001-01-15 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP1223336A1 true EP1223336A1 (fr) 2002-07-17
EP1223336B1 EP1223336B1 (fr) 2005-04-20

Family

ID=7670602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02000738A Expired - Lifetime EP1223336B1 (fr) 2001-01-15 2002-01-12 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1223336B1 (fr)
DE (2) DE10101562A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133833A (en) * 1983-01-17 1984-08-01 Daihatsu Motor Co Ltd I c engine fuel injector
DE3938551A1 (de) * 1989-11-21 1991-05-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
US5020500A (en) * 1990-03-28 1991-06-04 Stanadyne Automotive Corp. Hole type fuel injector and injection method
DE4303813C1 (de) * 1993-02-10 1994-06-30 Bosch Gmbh Robert Kraftstoffeinspritzdüse für Brennkraftmaschinen
EP0844383A2 (fr) * 1996-11-12 1998-05-27 Lucas Industries Public Limited Company Injecteur
EP1036934A2 (fr) * 1999-03-18 2000-09-20 Siemens Automotive Corporation Injecteur de combustible

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133833A (en) * 1983-01-17 1984-08-01 Daihatsu Motor Co Ltd I c engine fuel injector
DE3938551A1 (de) * 1989-11-21 1991-05-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
US5020500A (en) * 1990-03-28 1991-06-04 Stanadyne Automotive Corp. Hole type fuel injector and injection method
DE4303813C1 (de) * 1993-02-10 1994-06-30 Bosch Gmbh Robert Kraftstoffeinspritzdüse für Brennkraftmaschinen
EP0844383A2 (fr) * 1996-11-12 1998-05-27 Lucas Industries Public Limited Company Injecteur
EP1036934A2 (fr) * 1999-03-18 2000-09-20 Siemens Automotive Corporation Injecteur de combustible

Also Published As

Publication number Publication date
EP1223336B1 (fr) 2005-04-20
DE10101562A1 (de) 2002-07-25
DE50202816D1 (de) 2005-05-25

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