EP1260703B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1260703B1
EP1260703B1 EP02010912A EP02010912A EP1260703B1 EP 1260703 B1 EP1260703 B1 EP 1260703B1 EP 02010912 A EP02010912 A EP 02010912A EP 02010912 A EP02010912 A EP 02010912A EP 1260703 B1 EP1260703 B1 EP 1260703B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
elevations
valve according
ejection openings
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.)
Expired - Lifetime
Application number
EP02010912A
Other languages
German (de)
English (en)
Other versions
EP1260703A3 (fr
EP1260703A2 (fr
Inventor
Joerg Heyse
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 EP1260703A2 publication Critical patent/EP1260703A2/fr
Publication of EP1260703A3 publication Critical patent/EP1260703A3/fr
Application granted granted Critical
Publication of EP1260703B1 publication Critical patent/EP1260703B1/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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • 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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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 relates to a fuel injection valve according to the preamble of independent claim 1.
  • a fuel injection system for a mixture-compression 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.
  • the fuel injection valve is provided with at least one row of injection holes distributed over the circumference of the fuel injection valve. Through a targeted injection of fuel through the injection holes, a spray-guided combustion process is achieved by forming a mixture cloud with at least one jet.
  • a disadvantage of the fuel injection valve known from the above publication is in particular the poor atomization of injected through the injection openings in the combustion chamber of the internal combustion engine fuel, which is adversely affected mainly by the cylindrical shape of the flow channels. This is especially at low fuel pressure, so for example when starting the internal combustion engine, disadvantageous, which is reflected, inter alia, in poor exhaust emissions.
  • the fuel injection valve according to the invention with the features of the independent claim 1 has the advantage that the injection orifices are designed so that bulge-shaped projections rise above the inner end face of the valve seat body, comprising the flow channels in which the fuel is passed to the ejection openings.
  • the spray openings open into the combustion chamber of the internal combustion engine.
  • the diameter of the flow channels widens to the ejection openings, so that there is a maximum flow separation in the flow channels.
  • the preparation of the injection orifices is easily possible by means of a mandrel, which is struck against the flow direction of the fuel through the valve seat body.
  • the shape of the flow channels is easily modeled by the shape of the mandrel.
  • the shape of the edge surrounding the inlet can be designed, in particular, a tapered edge is favorable because of the maximum internal jet peening.
  • the beam detachment is also favorably influenced by an extended catchment radius which arises in the production of the spray-discharge openings.
  • the fuel injection valve 1 shows in a partial sectional view a first embodiment of a fuel injection valve 1 according to the invention.
  • the fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has at least one injection opening 7.
  • the valve closing body 4 of the inventively designed fuel injection valve 1 has a nearly spherical shape. As a result, an offset-free, gimbal valve needle guide is achieved, which ensures an exact functioning of the fuel injection valve 1.
  • the valve seat body 5 of the fuel injection valve 1 is formed almost pot-shaped and contributes by its shape to the valve needle guide.
  • the valve seat body 5 is inserted into a spray-side recess 34 of the nozzle body 2 and connected by a weld 35 to the nozzle body 2.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • a valve needle guide 14 which is designed disk-shaped.
  • a paired shim 15 On the other side of the dial 15 is a Anchor 20. This is connected via a first flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21.
  • a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • a second flange 31 is arranged, which serves as a lower anchor stop. He is connected via a weld 33 non-positively with the valve needle 3. Between the armature 20 and the second flange 31, an elastic intermediate ring 32 for damping armature bouncers when closing the fuel injection valve 1 is arranged.
  • the armature 20 and the valve seat body 5 run fuel channels 30a to 30c.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.
  • the fuel injection valve 1 on the valve seat body 5 which is arranged in a recess 34 of the nozzle body 2 and connected for example by means of a weld seam 35 with this, elevations 36, in which run into the ejection openings 7 flow channels 39 extend.
  • the elevations 36 are formed on an inner end face 37 of the valve seat body 5 and protrude into a volume 38 formed between the valve closing body 4 and the valve seat body 5. Due to their special shape and arrangement, they improve the detachment readiness of the flow by jet necking in the ejection openings 7.
  • the ejection-side part of the fuel injection valve 1 with the measures according to the invention is illustrated and explained in more detail in the following figures.
  • the first flange 21 is acted on the valve needle 3 by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement.
  • the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
  • this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus the valve needle 3 also in the stroke direction with.
  • the valve-closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface 6, as a result of which the fuel is sprayed off at the spray-discharge openings 7.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the first flange 21 from the inner pole 13, whereby the valve needle 3 moves against the stroke direction.
  • the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed.
  • the armature 20 is seated on the anchor stop formed by the second flange 31.
  • FIG. 2A shows an excerpt from a sectional view of the detail of FIG. 1 labeled IIA from the first exemplary embodiment of a fuel injection valve 1 configured according to the invention.
  • valve seat body 5 in the first embodiment described on its the valve closing body 4 facing inner end face 37 elevations 36, in which flow channels 39 extend, which open into the ejection openings 7.
  • the ejection openings 7 are formed in the present embodiment on the inner end face 37 of the valve seat body 5 and protrude into the between the volume of the valve closing body 4 and the valve seat body 5 formed volume 38 inside.
  • the ejection openings 7 can be attached to any points of the valve seat body 5. Preferably, they are arranged on a plurality of round or elliptical hole circles, which may be concentric or eccentric to each other, or on a plurality of parallel, obliquely or staggered straight or curved rows of holes.
  • the distance between the hole centers may be equidistant or different, but should be at least one hole diameter for manufacturing reasons.
  • the spatial orientation may be different for each hole axis, as indicated in Fig. 2A for two ejection openings 7.
  • the elevations 36 are cupped to tubular above the inner end face 37 of the valve seat body 5 raised.
  • the production of the ejection openings 7 takes place z. B. by means of a hardened mandrel which is stung against the direction of flow of the fuel through the material of the valve seat body 5, whereby the ejection openings 7 surrounding elevations 36 arise.
  • various shapes and cross sections of injection orifices 7 can be generated by arbitrary shapes of the mandrel.
  • FIG. 2B shows a cross-sectional shape of the ejection opening 7, which widens trumpet-shaped in the outflow direction of the fuel, while in Fig. 2C a barrel-like cross-sectional shape is shown, which also extends in total also in the outflow direction.
  • the detachment of the fuel flow of the ejection openings 7 can be promoted. Since the diameter of the ejection openings 7 is typically about 100 ⁇ m, a continuous flow is formed in the flow channels 39, which shows little tendency to move away from the walls to dissolve the flow channels. This then happens relatively abruptly at the ejection openings 7, as a result of which the mixture cloud injected into the combustion chamber becomes stringy and exhibits inhomogeneities. Due to the widening shape of the flow channels 39 in the elevations 36 and by the intrusion of the elevations 36 into the inflowing fuel, a jet constriction can take place, whereby a detachment of the flow in the ejection opening 7 is favored. As a result, a homogeneous mixture cloud with low stringency and subsequently better evaporation and mixing of the fuel-air mixture in the combustion chamber can be achieved.
  • the jets associated with the individual ejection openings 7 can be fanned out better.
  • the exhaust values of the internal combustion engine can be realized by a more effective combustion, especially at low fuel pressures in the shift operation or at the start of the internal combustion engine. As a result, the fuel consumption also decreases.
  • the formation of the elevations 36 can be influenced by the use of a die, not further shown by the elevations 36 are clamped between the matrix and the mandrel and thereby an edge 41 of the projections 36 can be arbitrarily shaped.
  • the edge 41 is formed in each case tapered, which lends itself in the sense of improving the flow constriction and subsequent detachment of the flow.
  • the invention is not limited to the illustrated embodiments and z. B. for arbitrarily arranged spray openings 7, for conical or cylindrical flow channels 39 and for any construction of inwardly opening multi-hole fuel injectors 1 applicable.

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)

Claims (11)

  1. Injecteur de carburant (1) pour des systèmes d'injection de carburant de moteurs à combustion interne, avec un actionneur excitable (10), une aiguille de soupape (3) en liaison active avec l'actionneur (10) et sollicitée dans un sens de fermeture par un ressort de rappel (23) pour actionner un obturateur de soupape (4), qui forme un siège étanche avec une surface de siège de soupape (6) formée sur un corps de siège de soupape (5), et au moins un orifice d'injection (7) formé dans le corps de siège de soupape (5),
    caractérisé en ce que
    chacun des orifices d'injection (7) débouche d'un bossage distinct (36), les bossages (36) étant saillants sur une face frontale interne (37) du corps de siège de soupape (5) et le carburant étant guidé à travers des canaux d'écoulement (39) dans les bossages (36).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les bossages (36) pénètrent dans un volume (38) formé entre l'obturateur de soupape (4) et le corps de siège de soupape (5).
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    les canaux d'écoulement (39) s'élargissent dans les bossages (36) dans une direction d'écoulement du carburant vers les orifices d'injection (7).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les canaux d'écoulement (39) s'élargissent en forme de trompette.
  5. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les canaux d'écoulement (39) s'élargissent d'abord en forme de tonneau et présentent un élargissement plus marqué vers les orifices d'injection (7).
  6. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les canaux d'écoulement (39) s'élargissent en forme de cône vers les orifices d'injection (7).
  7. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    les canaux d'écoulement (39) sont cylindriques à travers les bossages (36).
  8. Injecteur de carburant selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    les bossages (36) sont bombés au moyen d'un mandrin lors de la réalisation des orifices d'injection (7).
  9. Injecteur de carburant selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce qu'
    un rayon d'entrée (40) des canaux d'écoulement (39) est formé sur les orifices d'injection (7).
  10. Injecteur de carburant selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce qu'
    une arête (41) est formée sur les bossages (36) dans la région de l'extrémité de sortie des canaux d'écoulement (39).
  11. Injecteur de carburant selon la revendication 10,
    caractérisé en ce que
    l'arête (41) se termine en pointe.
EP02010912A 2001-05-21 2002-05-16 Soupape d'injection de carburant Expired - Lifetime EP1260703B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10124745 2001-05-21
DE2001124745 DE10124745A1 (de) 2001-05-21 2001-05-21 Brennstoffeinspritzventil

Publications (3)

Publication Number Publication Date
EP1260703A2 EP1260703A2 (fr) 2002-11-27
EP1260703A3 EP1260703A3 (fr) 2004-01-28
EP1260703B1 true EP1260703B1 (fr) 2007-07-04

Family

ID=7685600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02010912A Expired - Lifetime EP1260703B1 (fr) 2001-05-21 2002-05-16 Soupape d'injection de carburant

Country Status (2)

Country Link
EP (1) EP1260703B1 (fr)
DE (2) DE10124745A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341790A1 (de) * 2003-09-10 2005-04-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102008041676A1 (de) * 2008-08-29 2010-03-04 Robert Bosch Gmbh Brennstoffeinspritzventil

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736264A (en) * 1952-09-04 1955-09-07 Daimler Benz Ag Improvements in liquid fuel injection nozzle devices
DE2711350A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
GB2097471A (en) * 1981-04-23 1982-11-03 Lucas Ind Plc I.C. engine fuel injection nozzle
AT378244B (de) * 1982-12-14 1985-07-10 Steyr Daimler Puch Ag Einspritzduese fuer luftverdichtende, selbstzuendende hubkolben-brennkraftmaschinen
FI88333C (fi) * 1991-06-25 1993-04-26 Waertsilae Diesel Int Foerbaettrat insprutningsventilarrangemang foer braensle
DE4202387C2 (de) * 1991-11-11 1999-09-09 Bosch Gmbh Robert Ventil mit einer Abspritzöffnung
DE4222137B4 (de) * 1992-07-06 2006-05-04 Robert Bosch Gmbh Kraftstoff-Einspritzdüse für Diesel-Brennkraftmaschinen
US5540200A (en) * 1993-12-28 1996-07-30 Nissan Motor Co., Ltd. Fuel injection valve
US5484108A (en) * 1994-03-31 1996-01-16 Siemens Automotive L.P. Fuel injector having novel multiple orifice disk members
JPH08232813A (ja) * 1995-02-27 1996-09-10 Aisan Ind Co Ltd インジェクタ
DE19530995A1 (de) * 1995-08-23 1997-02-27 Bosch Gmbh Robert Brennstoffeinspritzventil
JP3329239B2 (ja) * 1997-09-05 2002-09-30 トヨタ自動車株式会社 燃料噴射弁
DE19804463B4 (de) 1998-02-05 2006-06-14 Daimlerchrysler Ag Kraftstoffeinspritzsystem für Ottomotoren
DE19847460A1 (de) * 1998-10-15 2000-04-20 Bosch Gmbh Robert Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
JP2000291513A (ja) * 1999-04-08 2000-10-17 Toyota Motor Corp ディーゼルエンジン
DE10056039A1 (de) * 2000-11-11 2002-05-16 Bosch Gmbh Robert Brennstoffeinspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1260703A3 (fr) 2004-01-28
DE50210406D1 (de) 2007-08-16
DE10124745A1 (de) 2003-03-27
EP1260703A2 (fr) 2002-11-27

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