EP1328719A2 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1328719A2
EP1328719A2 EP01986745A EP01986745A EP1328719A2 EP 1328719 A2 EP1328719 A2 EP 1328719A2 EP 01986745 A EP01986745 A EP 01986745A EP 01986745 A EP01986745 A EP 01986745A EP 1328719 A2 EP1328719 A2 EP 1328719A2
Authority
EP
European Patent Office
Prior art keywords
fuel
fuel injection
injection valve
swirl
valve according
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.)
Withdrawn
Application number
EP01986745A
Other languages
German (de)
English (en)
Inventor
Guenter Dantes
Detlef Nowak
Joerg Heyse
Michael Klaski
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 EP1328719A2 publication Critical patent/EP1328719A2/fr
Withdrawn legal-status Critical Current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
    • F02M61/16—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
    • 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
    • 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
    • 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
    • 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
    • F02M61/163—Means being injection-valves with helically or spirally shaped grooves
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injector which is characterized in that a guide and seat area is provided at the stro downward end of the valve, which is formed by three disc-shaped elements.
  • a swirl element is embedded between a guide element and a valve seat element.
  • the guide element serves to guide an axially movable valve needle projecting through it, while a valve closing section of the valve needle interacts with a valve seat surface of the valve seat element.
  • the swirl element has an inner opening area with a plurality of swirl channels which are not connected to the outer circumference of the swirl element. The entire opening area extends completely over the axial thickness of the swirl element.
  • a fuel injector which is characterized in that it has a swirl disk downstream of a valve seat, which consists of at least one metallic
  • - ⁇ - ⁇ Material consists of at least two swirl channels opening into a swirl chamber and in which all layers are directly adhered to one another by means of galvanic metal deposition (multilayer electroplating).
  • the swirl disk is installed in the valve in such a way that its surface normal is inclined at an angle to the longitudinal axis of the valve which deviates from 0 °, so that the swirl disk is oriented by the alignment. a jet angle ⁇ to the valve longitudinal axis is achieved.
  • a disadvantage of the fuel injection valves known from the above-mentioned documents is, in particular, the high manufacturing and thus cost expenditure due to the combination of a large number of individual parts which cannot be integrated into standard fuel injection valves without considerable effort.
  • complex manufacturing and assembly measures must be taken.
  • the jet angles ⁇ and ⁇ cannot be achieved or can only be implemented in an unsatisfactory manner with conventional swirl preparation methods, which is reflected in asymmetries and inhomogeneities in the fuel jet or in the metered amount of fuel.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the swirl preparation by a swirl element, which is designed in the form of a spirally twisted polygon, in particular a square or octagon, is particularly inexpensive and easy to assemble.
  • the polygon forms, together with an adjacent wall, helical flow channels along which the fuel is guided on a spiral path and thereby receives a swirl.
  • the swirl element can be arranged either on the inlet side of the sealing seat or on the outlet side of the sealing seat.
  • the fuel flow through the fuel channels formed on the swirl element can be adapted as desired over the number of sides of the polygon, depending on the requirements.
  • An inclination of the longitudinal axis of the swirl element with respect to the longitudinal axis of the fuel injection valve is also advantageous for use in oblique injection in order to reach the injection angle ⁇ without deflecting the fuel jet.
  • a swirl chamber is formed on the outlet side of the swirl element, which is dimensioned so that a homogeneous swirl flow can form therein and the dead volume is minimal.
  • the arrangement of the swirl element in an insert, which can be inserted into the valve seat body, is advantageous since the insert and the recess receiving the insert are easy to produce.
  • the strength of the swirl imparted to the fuel can be adjusted particularly advantageously via the degree of twisting of the polygon and the resulting differences in the inclination of the spiral structure of the polygon. This makes it possible to homogenize the swirl flow formed in the swirl chamber not only over the volume of the swirl chamber, but also over the direction of the fuel jets entering the swirl chamber.
  • FIG. 1A shows a schematic section through a first exemplary embodiment of a fuel injector according to the invention
  • FIG. 1B shows a schematic section of the first exemplary embodiment of the fuel injector according to the invention shown in FIG. 1 in the area IB in FIG. 1,
  • FIG. 1C shows a schematic section along the line IC-IC in FIG. 1B with a view in the outflow direction
  • FIG. 2A shows a schematic section through a second exemplary embodiment of a fuel injection valve according to the invention in the same area as FIG. IB, and
  • Fig. 2B is a schematic section along the line IIB-IIB in Fig. 2A with a view in the outflow direction.
  • a fuel injector 1 shown in FIG. 1A is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.
  • the fuel injection valve 1 is particularly 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 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 sealing seat.
  • the valve seat body 5 can be inserted into a recess 50 of the nozzle body 2.
  • the fuel injection valve 1 is a fuel injection valve 1 that opens inwards and has an injection 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 adjusting disc 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disc 15.
  • 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.
  • Fuel channels 30a and 30b run in the valve needle guide 14 and in the armature 20, which channels the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the spray opening 7.
  • the fuel injector 1 is sealed by a seal 28 against a fuel line, not shown.
  • a swirl element 34 Arranged on the inlet side of the sealing seat is a swirl element 34 in the form of a twisted polygon 35, which in the present first exemplary embodiment is pushed onto the valve closing body 4 or the valve needle 3.
  • a detailed illustration of the swirl element 34 can be found in FIGS. IB and IC.
  • 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 its stroke direction in such a way that the valve closing body 4 is held in sealing contact with the valve seat 6.
  • the magnetic coil 10 When the magnetic 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 12 and the armature 20.
  • the armature 20 also carries the flange 21, which is welded to the valve needle 3, in the lifting direction.
  • the valve closing body 4 which is operatively connected to the valve needle 3, lifts ⁇ OU of the valve seat surface 6 and the fuel channel 37, which is formed via the fuel channels 30a and 30b and on the swirl element 34, is sprayed off to the spray opening 7. This is preferably inclined at a spray angle ⁇ with respect to a longitudinal axis 36 of the fuel injection valve 1.
  • the armature 20 falls after sufficient decay of the magnetic field 'by the pressure of the return spring 23 from internal pole 13, thereby moves the valve needle 3 is in operative connection flange 21 against the stroke direction.
  • the valve needle 3 will thereby moved in the same direction, whereby the valve closing body 4 on the valve seat surface 6 touches • and the fuel injection valve 1 is closed.
  • FIG. 1B shows an enlarged sectional view of an enlarged view of the spray-side part of the first exemplary embodiment of a fuel injector 1 according to the invention described in FIG. 1A.
  • the section shown is designated IB in FIG. 1A.
  • the swirl element 34 which in the present exemplary embodiment is designed as a square 35 with four sides 48 of equal length, is attached to the valve closing body 4 and / or the valve needle 3.
  • a helical structure 38 is created, as a result of which a fuel channel 37 serving as a flow channel is enclosed between an inner wall 40 of a recess 39 of the valve seat body 5 and which also communicates a swirl to the fuel flowing to the sealing seat due to its spiral shape.
  • any jet angle ⁇ can be achieved.
  • a swirl chamber 46 is formed on the spray side of the swirl element 34, delimited by the swirl element 34, the valve closing body 4 and the valve seat body 5.
  • the volume of the swirl chamber 46 is preferably dimensioned such that on the one hand the formation of a homogeneous swirl flow is possible and on the other hand the dead volume is minimized.
  • the swirl flow can be modeled by the shape of the helical structure 38 so that it does not come to a standstill even in the dead time between two injection cycles of the fuel injector 1.
  • the equilateral square 35 not only serves to prepare the swirl, but also to guide the valve needle 3, since the helical structure 38 of the swirl element 34 is applied of the inner wall 40 of the recess 39 and thus the valve needle 3 is guided in the recess 39.
  • FIG. IC shows a section along the line IC-IC in FIG. IB, the elements described above being illustrated again.
  • the helical structure 38 of the polygon 35 is produced by heating the prefabricated component and then rotating it.
  • the polygon 35 is clamped, for example, in a holding device and rotated until the helical structure 38 has developed as desired.
  • the flow to the sealing seat can be selected by a suitable choice of the shape of the polygon 35, the flow through the fuel channels 37 becoming smaller with an increasing number of edges 41 of the polygon 35. The flow is therefore greatest with a triangle and decreases increasingly over a square to a pentagonal and hexagonal.
  • the strength of the swirl and thus also the shape of the fuel jet depend on the degree of rotation of the polygon 35. The more the polygon 35 is twisted, the flatter the slope of the helical structure 38, and the stronger the swirl is . , Fuel jet is communicated when passing through the spiral fuel channels 37. With regard to the friction of the edges 41 on the inner wall 40 of the recess 39 of the valve seat body 5, a rounding of the edges 41, as described in the second exemplary embodiment in FIG. 2B, could be advantageous.
  • FIG. 2A shows in the same representation as FIG. IB a second exemplary embodiment of a fuel injector 1 according to the invention.
  • the swirl element 34 is arranged on the outflow side of the sealing seat and its size can thus be minimized.
  • the second exemplary embodiment of the fuel injection valve 1 is designed as an oblique injection fuel injection valve 1, as a result of which the spray angle ⁇ can be set better than by an inclination of the spray opening 7.
  • a longitudinal axis 42 of the swirl element 34 is at an angle ⁇ with respect to the longitudinal axis 36 of the fuel injection valve 1 inclined. This eliminates the redirection of the fuel jet, which occurs with swirl preparation on the inlet side, thereby avoiding inhomogeneities and asymmetries in the jet pattern.
  • valve seat body 5 has a preferably cylindrical recess
  • the insert 44 advantageously also has a cylindrical shape.
  • the swirl element 34 is arranged.
  • the swirl chamber 46 is formed on the outflow side of the swirl element 34 and merges into the spray opening 7 with a taper.
  • the volume of the swirl chamber 46 can also be kept small enough to keep the swirl flow homogeneous and to minimize the dead volume.
  • FIG. 2B shows a schematic section through the second exemplary embodiment of a fuel injector 1 according to the invention shown in FIG. 2A along the line IIB-IIB with a view in the outflow direction.
  • the octagon 47 is twisted in the second exemplary embodiment 47 designed swirl element 34 nestles against the inner wall 49 of the recess 45 of the insert 44.
  • the octagon 47 is provided with four longer and shorter sides 48, the four shorter sides 48 being able to emerge, for example, from a bevel or rounding of the edges 41 of the square 35.
  • the shape of the octagon 47 thus approximates the shape of the square 35 with rounded edges 41. In this way, an improved form fit and a more uniform friction situation compared to the embodiment variant of a square 35 with non-rounded edges 41 explained in the first exemplary embodiment can be achieved.
  • the invention is not limited to the illustrated embodiments and z. B. can also be used for polygons with a larger number " from sides 48 or any shaped, rounded edges 41 as well as for . Any designs 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)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne une soupape d'injection de carburant (1) destinée notamment à l'injection directe de carburant dans une chambre de combustion d'un moteur thermique, ladite soupape comprenant: un corps de fermeture de soupape (4) qui forme un siège étanche avec une surface de siège de soupape (6) qui est formée contre un corps de siège de soupape (5); et un élément de turbulence (34). L'élément de turbulence (34) présente une partie polygonale en elle-même torsadée (35, 47) qui a une structure spiralée (38) et coopère avec un évidement (39, 43) du corps de siège de soupape (5) pour former des canaux à carburant (37) qui servent à guider le carburant en direction de l'ouverture d'injection (7) selon une trajectoire en spirale.
EP01986745A 2000-10-10 2001-10-10 Soupape d'injection de carburant Withdrawn EP1328719A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10050053 2000-10-10
DE2000150053 DE10050053B4 (de) 2000-10-10 2000-10-10 Brennstoffeinspritzventil
PCT/DE2001/003847 WO2002031350A2 (fr) 2000-10-10 2001-10-10 Soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1328719A2 true EP1328719A2 (fr) 2003-07-23

Family

ID=7659215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01986745A Withdrawn EP1328719A2 (fr) 2000-10-10 2001-10-10 Soupape d'injection de carburant

Country Status (5)

Country Link
EP (1) EP1328719A2 (fr)
JP (1) JP2004518052A (fr)
CZ (1) CZ20021997A3 (fr)
DE (1) DE10050053B4 (fr)
WO (1) WO2002031350A2 (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
DE10232049A1 (de) * 2002-07-16 2004-02-05 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10353639A1 (de) † 2003-11-17 2005-06-16 Robert Bosch Gmbh Brennstoffeinspritzventil
US11015559B2 (en) 2018-07-27 2021-05-25 Ford Global Technologies, Llc Multi-hole fuel injector with twisted nozzle holes

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487369A (en) * 1982-01-11 1984-12-11 Essex Group, Inc. Electromagnetic fuel injector with improved discharge structure
GB2125888B (en) * 1982-08-26 1985-10-16 Bosch Gmbh Robert I c engine fuel injection valve
DE3411331A1 (de) * 1984-03-28 1985-07-25 Daimler-Benz Ag, 7000 Stuttgart Luftverdichtende, direkteinspritzende brennkraftmaschine mit im zylinderkopf angeordnetem brennraum
DE3914486A1 (de) * 1989-05-02 1990-11-08 Bosch Gmbh Robert Verfahren zur herstellung einer ventilnadel und ventilnadel
DE19736682A1 (de) * 1997-08-22 1999-02-25 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19815789A1 (de) * 1998-04-08 1999-10-14 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19906146A1 (de) * 1999-02-13 2000-08-17 Peter Walzel Düse zum Zerstäuben von Flüssigkeiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0231350A2 *

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
WO2002031350A3 (fr) 2002-07-04
WO2002031350A2 (fr) 2002-04-18
DE10050053A1 (de) 2002-04-18
JP2004518052A (ja) 2004-06-17
CZ20021997A3 (cs) 2003-12-17
DE10050053B4 (de) 2005-04-28

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