EP1328725A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1328725A1
EP1328725A1 EP01987848A EP01987848A EP1328725A1 EP 1328725 A1 EP1328725 A1 EP 1328725A1 EP 01987848 A EP01987848 A EP 01987848A EP 01987848 A EP01987848 A EP 01987848A EP 1328725 A1 EP1328725 A1 EP 1328725A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
swirl
fuel
guide
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
EP01987848A
Other languages
German (de)
English (en)
Other versions
EP1328725B1 (fr
Inventor
Guenther Hohl
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 EP1328725A1 publication Critical patent/EP1328725A1/fr
Application granted granted Critical
Publication of EP1328725B1 publication Critical patent/EP1328725B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F02M61/04—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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/16—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

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • Fuel injection valves which have a component for guiding a valve needle, are known from DE 36 43 523 AI. They have a swirl disk which is arranged upstream of the valve sealing seat, with a central guide bore. Swirl channels, which connect the space upstream of the swirl disk, which is pressurized with fuel, with a swirl chamber adjoining in the direction of flow, serve to guide the flow. When the valve is open, the fuel flows out of the swirl channels into the swirl chamber, the speed vector having a component in the circumferential direction. The central bore of the swirl disk takes over the guiding of the valve closing body or the Ven.tiln.adel.
  • the swirl disk is centered by a conical seat in the area of the valve seat, where it is held in a sealing system due to the restriction of the fuel flow.
  • the recess in the swirl disk is closely tolerated with respect to the valve needle or the valve closing body.
  • a fuel injector is also known, in which the guide of the valve needle or the valve closing body is arranged in an assembly upstream of the sealing seat.
  • a secondary flow path is also prevented here by forming the smallest possible gap between the guide bore and the valve needle or valve closing body.
  • a swirl is generated through bores that have a tangential component and open upstream of the valve sealing seat.
  • the valve needle is guided in a sleeve, which in turn is centered in the valve seat by a downstream conical configuration.
  • the valve seat body and the guide are made in one piece.
  • a disadvantage of the fuel injection valves shown is the high precision that is required in the manufacture of the components of the valve.
  • the formation of a swirl essentially depends on the flow through the swirl channels.
  • An existing bypass flow path for the fuel leads to a flow component without peripheral speed and worsens - for example the swirl formation and consequently the atomization of the fuel. Ultimately, this leads to deteriorated combustion.
  • Due to the manufacturing process the dimensions of the components are subject to tolerances. This can lead to an angular error of the valve needle or the valve closing body in the area of the valve seat.
  • the guidance of the valve needle or the valve closing body is taken over by a component which is centered in the nozzle body either in a form-fitting or material-locking manner.
  • the fuel according to the invention ' injection valve according to the characterizing features of claim 1 ' has the advantage that the central axis of the valve needle against the
  • Valve needle or valve seat body and the leading bore is required.
  • a guide compensation can be inclined together with the valve needle.
  • the guide compensation and valve needle remain in the correct position, which improves the sealing fit between the two components.
  • the angle between the valve needle and the central axis of the fuel injector is compensated for by the formation of a sealing seat between the guide compensation and a swirl disk, which is flexible with regard to the angle between the central axes of the swirl disk and the guide compensation.
  • the entire fuel flow reaching the spray opening therefore flows through the swirl channels, as a result of which a defined generation of swirl and an exact metering of a spraying fuel quantity is possible.
  • the possibility of producing the swirl disk together with the guide compensation and a spring in a pre-assembly is advantageous.
  • the entire assembly can be treated as a single component in the further assembly process.
  • Another advantage is the common center of the spherical sealing surface of the guide compensation and the spherical valve closing body in the idle state of the fuel injector.
  • the position of the valve closing body is clearly determined by the valve seat body. An angular error therefore only results in a rotation about the center of the spherical valve closing body.
  • the sealing arrangement of both sealing seats is not affected by rotation around a common center.
  • Fig. 1 shows a schematic partial section through an inventive fuel injector
  • Fig. 2 shows a schematic section in section II of Fig. 1 through the embodiment of a fuel injector according to the invention.
  • the fuel injector 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited
  • the Fuel injection valve 1 is particularly suitable - for the direct injection of fuel 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 operatively connected to a valve closing body 4, which cooperates with a valve seat surface 6 arranged on a valve seat body 5 to form a first sealing seat.
  • the fuel injection valve 1 is an inwardly opening, electromagnetically actuated fuel injection valve 1, which has a spray opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a solenoid 10.
  • 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 adjustment disk is used to adjust the lift 15.
  • At the other side of adjustment disk 15 is an armature 20. This is' via a first flange 21 force-locking to valve needle 3, which is connected, for example via a welded seam 22 with the first flange 21 ,
  • a restoring spring 23 is supported on the first flange 21 and, in the present design of the fuel injector 1, is preloaded by a sleeve 24.
  • a second flange 31, which is also connected to the valve needle 3 via a weld 33, serves as the lower anchor stop.
  • An elastic intermediate ring 32 which rests on the second flange 31, prevents bouncing when the fuel injector 1 is closed.
  • fuel channels 30a, 30b or swirl channels 36 run which guide the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the spray opening 7 in the valve seat body 5.
  • the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 against the stroke direction via the first flange 21 on the valve needle 3 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, the stroke being predetermined by a working gap 27 which is in the rest position between the inner pole 13 and the armature 20.
  • 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 and the fuel reaching the spray opening 7 via the fuel channels 30a, 30b or swirl channels 36 is sprayed off.
  • the armature 20 drops from the inner pole 13 after the magnetic field has been 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. This sets the valve closing body 4 on the Valve seat 6, and the fuel injector 1 is closed.
  • a fuel injector 1 has a swirl disk 35, in the central recess 38 a sealing seat 39 is integrated, which cooperates with a radial extension 40 of a guide compensation 41 at the downstream end to a second sealing seat and a deflection of the central axis of the valve needle 3 opposite the central axis of the fuel injector 1 allowed.
  • the swirl disk 35 has, as shown in FIG. 2, for guiding the fuel streams swirl channels 36, which are introduced, for example, as recesses in the downstream side 43 of the swirl disk 35 and are closed with the upstream side 44 of the valve seat body 5 to form swirl channels 36.
  • the swirl channels 36 open with a tangential component into a swirl chamber 37 upstream of the valve seat surface 6.
  • the swirl disk 35 has a central, continuous recess 38, which has a radial extension 45 downstream and is penetrated by the valve needle 3 and the guide compensation 41 , A downstream sealing seat 39 is arranged in the extension 45.
  • the guide compensation 41 also has a central recess 46 which is tolerated with respect to the radial expansion of the valve needle 3 so that axial movement of the valve needle 3 is easily possible, but a leakage flow which forms along the fit is prevented.
  • the guide compensation 41 has a radial extension 40, the radial dimensions of which are larger than the smallest radial extension of the recess 38 in the swirl disk 35.
  • the guide compensation 41 Upstream of the radial extension 40, the guide compensation 41 is sleeve-shaped and the radial extension of the Guide compensation 41 smaller than the recess 38 of the Swirl disk 35, so that the guide compensation 41 can be introduced into the swirl disk 35 in the countercurrent direction until the sealing seat surface 39 of the swirl disk 35 and the radial extension 40 of the guide compensation 41 are in sealing contact with one another. Between the sleeve-shaped area 52 of the guide compensation 41 and the central recess 38 of the swirl disk 35 there is a gap 47, which enables a deflection of the central axis of the guide compensation 41 against the central axis of the fuel injection valve 1.
  • the valve closing body 4 like the radial extension 40 of the guide compensation 41, is preferably spherical in the area of the respective sealing seat surface.
  • the two centers of the spherical geometries are identical.
  • both the valve closing body 4 and the guide compensation 41 remain in sealing contact due to the spherical geometry.
  • FIG. 2 shows an exemplary embodiment with a pressure-loaded spring 48 which is supported on the upstream side 49 of the swirl disk 35.
  • a flange 50 is attached with a collar-shaped counter bearing 51 for the spring 48, which is connected to the guide compensation 41 in a manner not shown.
  • the radial dimension of the collar-shaped counter bearing 51 is smaller than the inside diameter of the nozzle body 2, so that a deflection of the central axis of the guide compensation 41 is not limited by contact between the counter bearing 51 and the nozzle body 2.
  • fuel can pass the counter bearing 51 to the swirl channels 36 in the swirl disk 35 flow without the counter bearing 51 having to be provided with through openings.
  • the guide compensation 41 can be widened in one piece on the upstream side instead of the flange 50.
  • the guide compensation 41 can be designed with the valve closing body 4 instead of the valve needle 3 as a corresponding component.

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)

Abstract

L'invention concerne une soupape d'injection de carburant (1), servant en particulier à l'injection directe de carburant dans la chambre de combustion d'un moteur à combustion interne à compression du mélange et à allumage extérieur. Cette soupape comprend un disque à turbulence (35) comportant des canaux à turbulence (36) ainsi qu'un évidement central (38) dans lequel est introduit un élément d'égalisation de guidage (41), dont l'axe central peut être incliné par rapport à l'axe central de la soupape d'injection de carburant (1) et qui est ajusté de façon étanche par rapport au pointeau de soupape (3). Une zone étanche présentant une certaine tolérance par rapport à une déviation de l'axe central est formée par une surface de siège d'étanchéité (39) située dans le disque à turbulence (35) et par une partie radialement élargie (40) de l'élément d'égalisation de guidage (41). Cette zone étanche, comme l'ajustement étanche entre le pointeau de soupape (3) et l'élément d'égalisation de guidage (41), empêche le passage d'un écoulement de fuite sans turbulence.
EP01987848A 2000-10-19 2001-10-17 Soupape d'injection de carburant Expired - Lifetime EP1328725B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10051900 2000-10-19
DE10051900A DE10051900A1 (de) 2000-10-19 2000-10-19 Brennstoffeinspritzventil
PCT/DE2001/003967 WO2002033249A1 (fr) 2000-10-19 2001-10-17 Soupape d"injection de carburant

Publications (2)

Publication Number Publication Date
EP1328725A1 true EP1328725A1 (fr) 2003-07-23
EP1328725B1 EP1328725B1 (fr) 2004-08-11

Family

ID=7660365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01987848A Expired - Lifetime EP1328725B1 (fr) 2000-10-19 2001-10-17 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US6719220B2 (fr)
EP (1) EP1328725B1 (fr)
JP (1) JP2004511721A (fr)
CN (1) CN1394257A (fr)
DE (2) DE10051900A1 (fr)
WO (1) WO2002033249A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1811166A1 (fr) * 2006-01-24 2007-07-25 Siemens Aktiengesellschaft Ensemble à vanne pour une soupape d'injection et soupape d'injection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6994234B2 (en) * 2003-04-03 2006-02-07 Nordson Corporation Electrically-operated dispensing module
DE10357759A1 (de) * 2003-12-10 2005-07-28 Robert Bosch Gmbh Brennstoffeinspritzventil
US7414532B2 (en) * 2005-04-20 2008-08-19 Nordson Corporation Method of attaching RFID tags to substrates

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1090031B (de) * 1956-04-13 1960-09-29 Roosa Vernon D Brennstoffeinspritzduese fuer Brennkraftmaschinen
GB1212443A (en) * 1968-01-29 1970-11-18 Clayton Dewandre Holdings Ltd Fuel injector for internal combustion engines
DE2032005A1 (de) * 1970-06-29 1972-01-05 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
US4197997A (en) * 1978-07-28 1980-04-15 Ford Motor Company Floating ring fuel injector valve
DE3643523A1 (de) 1986-12-19 1988-06-30 Bosch Gmbh Robert Einspritzventil fuer kraftstoffeinspritzanlagen
DE3719459A1 (de) * 1987-06-11 1988-12-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
US4958771A (en) * 1989-06-21 1990-09-25 General Motors Corporation Injection nozzle
DE19625059A1 (de) 1996-06-22 1998-01-02 Bosch Gmbh Robert Einspritzventil, insbesondere zum direkten Einspritzen von Kraftstoff in einen Brennraum eines Verbrennungsmotors
US6168098B1 (en) * 1999-06-09 2001-01-02 Siemens Automotive Corporation Fuel injector with tubular lower needle guide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0233249A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1811166A1 (fr) * 2006-01-24 2007-07-25 Siemens Aktiengesellschaft Ensemble à vanne pour une soupape d'injection et soupape d'injection

Also Published As

Publication number Publication date
DE10051900A1 (de) 2002-05-29
DE50103252D1 (de) 2004-09-16
EP1328725B1 (fr) 2004-08-11
JP2004511721A (ja) 2004-04-15
CN1394257A (zh) 2003-01-29
US6719220B2 (en) 2004-04-13
WO2002033249A1 (fr) 2002-04-25
US20030071148A1 (en) 2003-04-17

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