EP1644636B2 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1644636B2
EP1644636B2 EP04730825.9A EP04730825A EP1644636B2 EP 1644636 B2 EP1644636 B2 EP 1644636B2 EP 04730825 A EP04730825 A EP 04730825A EP 1644636 B2 EP1644636 B2 EP 1644636B2
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EP
European Patent Office
Prior art keywords
bulge
fuel injection
injection valve
basic shape
bulges
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
EP04730825.9A
Other languages
German (de)
English (en)
Other versions
EP1644636B1 (fr
EP1644636A1 (fr
Inventor
Heribert Duetsch
Guillermo Urzua
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
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Filing date
Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1644636A1 publication Critical patent/EP1644636A1/fr
Publication of EP1644636B1 publication Critical patent/EP1644636B1/fr
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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
    • F02M61/18—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
    • F02M61/184—Discharge orifices having non circular sections
    • 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
    • F02M61/1806—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
    • F02M61/1846—Dimensional characteristics of discharge orifices

Definitions

  • the invention is based on a fuel injection valve, as it corresponds to the preamble of claim 1.
  • a fuel injection valve is for example from the document JP 11-117833 known and has a valve body in which a blind hole is formed.
  • a valve seat is formed, with which cooperates arranged in the blind bore valve needle.
  • at least one injection channel is formed, which connects the interior formed by the blind bore with the combustion chamber of the internal combustion engine and which has an inlet opening and an outlet opening. Through this injection channel, controlled by the valve needle, which cooperates with the valve seat, fuel injected from the blind bore into the combustion chamber of the internal combustion engine.
  • the injection channel is usually formed substantially cylindrical, in particular, the inlet opening can be modified. From the Scriptures JP 11-117833 However, other forms are known in which the injection channel has a star shape, cross shape, club shape or rectangular shape.
  • the cross-sectional shape of the injection channel affects the injection characteristic of the fuel injection valve and may - depending on the type of fuel injection valve - lead to an improvement of the combustion process. However, all of the shapes shown there have in common that they do not sufficiently take into account the inflow conditions from the valve seat into the injection channel.
  • the fuel flowing into the injection channel is forced into a flow profile, which is determined by the cross section of the injection channel, which does not correspond to the inflow profile of the fuel into the injection hole, thus resulting in pressure losses in the injection channel, the spray of the fuel in the injection can affect the combustion chamber.
  • document DE 199 31 890 A discloses a fuel injection valve having an injection channel having an entrance opening with an elliptical basic shape.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the inlet cross-section of the injection channel is such that a low-loss introduction of the fuel from the blind bore in the injection channel is possible, what the feasible injection pressure and the atomization of the fuel Injection process influenced positively.
  • the inlet openings seen in cross-section a circular basic shape with a radius, wherein over a first angular range of the circumference of the circular basic shape, a first protrusion is formed, whose angular range is less than 180 °.
  • a second bulge is provided in the circular basic shape, which is formed mirror-symmetrically to the first bulge, wherein the mirror plane passes through the center of the circular basic shape.
  • Both lobes are arranged to each other so that the two connecting lines of the farthest points of the recesses with the center enclose an angle with the mirror plane of less than 180 °. Due to flow tests it has been shown that such recesses optimally support the inflow of the fuel and lead to a maximization of the speed and thus to an improvement of the injection conditions.
  • the injection channel can first be formed as a hole with a circular cross-section during production, into which the bulges are then introduced.
  • the bulges starting from the inlet opening to the outlet opening, decrease continuously such that the outlet opening advantageously corresponds at least approximately to a circular shape. This reduces the passage cross-section of the injection channel in its longitudinal extent, which leads to an acceleration of the fuel in the injection channel.
  • the bore reduces its circular cross-section from the inlet opening to the outlet opening, ie has a conical shape, which results in a further acceleration of the fuel flow.
  • the orientation of the mirror plane between the two bulges is oriented in an advantageous manner in a common plane with the longitudinal axis of the blind bore, so that with respect to the mirror plane symmetrical inflow of fuel into the injection channel takes place.
  • FIG. 1 a fuel injection valve according to the invention is shown in longitudinal section.
  • a blind bore 3 is formed, which has a longitudinal axis 8 and at the bottom of a substantially conical valve seat 11 is formed.
  • the valve seat 11 is followed by a blind bore 9, from which several injection channels 7 go out.
  • the injection channels 7 open into the installation position of the fuel injection valve in the combustion chamber of the internal combustion engine.
  • a piston-shaped valve needle 5 is arranged longitudinally displaceable, which is guided in a guided portion 15 in the blind bore 3. Starting from the guided section 15, the valve needle 5 tapers to form a pressure shoulder 13 and merges at its valve seat-side end in a substantially conical valve sealing surface 17, which cooperates with the valve seat 11.
  • the blind bore 3 is radially expanded and thus forms a pressure chamber 19, which continues as an annular channel between the valve needle 5 and the blind bore 3 to the valve seat 11.
  • the pressure chamber 19 opens an extending in the valve body 1 inlet channel 25, via which the pressure chamber 19 can be filled with fuel.
  • the valve needle 5 is acted upon by a device, not shown, with a closing force in the direction of the valve seat 11 so that a longitudinal movement of the valve needle 5 in the blind bore 3 can be achieved via the interplay of the hydraulic forces on the pressure shoulder 13 and the closing force. If the valve needle 5 rests on the valve seat 11, the pressure chamber 19 is sealed. On the other hand, if the valve needle 5 is lifted off the valve seat, fuel flows from the pressure chamber 19 into the blind hole 9 and is injected from there through the injection channels 7 into the combustion chamber.
  • FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole, this area being in FIG. 1 marked with II.
  • the injection channels 7, which emanate from the blind hole, have a substantially cylindrical shape.
  • the inlet opening 20 of the injection channels 7 is arranged in the blind hole 9 and the outlet opening 22, from which the fuel exits and is injected into the combustion chamber, on the outer wall of the valve body 1.
  • the right edge of the FIG. 2 is shown, five sectional planes A, B, C, D and E are drawn, which are equidistant from each other, wherein the sectional plane A of the inlet opening 20 and the sectional plane E of the outlet opening 22 corresponds. These cutting planes will be discussed later.
  • FIG. 3 shows an enlarged view of the inner wall of the blind hole 9 with an injection channel 7.
  • the inlet opening 20 of the injection channel 7 is not circular, but has an optimized for the inlet of the fuel mold. Over the length of the injection channel 7, the shape of the cross section - starting from the inlet opening 20 - more and more approaches the circle, so that the outlet opening 22 is circular. In this way, the total cross section of the Einspitzkanals is reduced over the length, which accelerates the flow of the fuel in the injection channel 7.
  • FIG. 4 again shows the inlet opening 20 of an injection channel 7 in an enlarged view.
  • the inlet opening 20 has a circular basic shape 27 in cross section, which has a center point 28 and a radius R.
  • a first bulge 30 is formed, which has approximately a parabolic shape in the illustration shown here.
  • the bulge 30 has a point of greatest distance 130, the distance from the center point 28 in the FIG. 4 is denoted by A.
  • the angle range a 1 here is smaller than 180 °
  • the connecting line 35 which connects the point largest distance 130 with the center 28, includes with a mirror plane 33 an angle b, which is smaller than 180 °.
  • the mirror plane 33 in this case runs through the center 28 and is preferably arranged in the same plane as the longitudinal axis 8 of the blind bore 3.
  • the circular basic shape 27 has, over a second angular range a 2, a second bulge 39, which is mirror-symmetrical to the first bulge 30 with respect to the mirror plane 33.
  • the second bulge 31 has a point greatest distance 131, the connecting line with the center 28 with the mirror plane 33 also includes the angle b.
  • the bulges 30, 31 extend as channel-like recesses on the wall of the injection channel 7 symmetrically on both sides.
  • the depth of the bulges 30, 31 may change or remain constant over the entire length of the injection channel 7.
  • FIGS. 5A to 5E are cross sections through an embodiment of an injection channel 7, wherein the cross sections in their position the planes A, B, C, D and E of FIG. 2 correspond.
  • FIG. 5A which represents the shape of the injection channel 7 in the sectional plane A, so the inlet opening 20, the bulges 30, 31 are still clearly pronounced.
  • FIG. 5B and FIG. 5C these bulges 30, 31 are already significantly reduced, and in the sectional plane D and E, in the Figures 5D and 5E are shown, the bulges 30, 31 are gone.
  • the inlet opening 20 of the injection channel 7 is oriented in the embodiment described above so that the bulges 30, 31 point in the direction of the open end of the blind bore 3.
  • the inlet opening 20 is arranged rotated by 180 ° about the center 28, so that the bulges 30, 31 form channel-like recesses on the side of the injection channel 7, which is directed away from the valve needle 5.
  • this orientation of the bulges 30, 31 can lead to Einström opposition in the injection channel 7, which are advantageous and lead to improved spray formation and combustion.
  • the diameter of the basic shape of the inlet opening 20 to the outlet opening 22 is continuously reduced, so that, for example, results in a tapered basic shape whose walls the bulges 30, 31 are provided.

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

Claims (6)

  1. Injecteur de carburant pour moteurs à combustion interne, comprenant un corps de soupape (1) muni d'un alésage à trou borgne (3) pouvant être rempli de carburant et dont le fond présente un siège de soupape (11), avec au moins un canal d'injection (7) partant du fond et muni d'une ouverture d'entrée (20) et d'une ouverture de sortie (22),
    caractérisé en ce qu'observée en coupe transversale l'ouverture d'entrée (20) présente :
    - une forme de base circulaire avec un rayon (R) et un point central (28), et
    - une première courbure (30) formée sur une première plage angulaire (a1) de la périphérie de la forme de base circulaire
    - la première plage angulaire (a1) étant inférieure à 180°, et
    - la première courbure (30) est conçue de sorte que la zone de paroi de la courbure (30) présente un point à une distance maximale (130) par rapport au point central (28),
    - et une deuxième courbure (31) formée de façon symétrique par rapport à la première courbure (30) sur une deuxième plage angulaire (a2), le plan de symétrie (33) passant par le point central (28) de la forme de base circulaire, et
    - les deux courbures (30 ; 31) étant disposées l'une par rapport à l'autre de sorte que les deux lignes de jonction (35, 36) des points avec la plus grande distance (130 ; 131) enferment avec le point central (28) respectivement un angle (b) avec le plan de symétrie (33) inférieur à 180° et
    - le plan de symétrie (33) se situe dans un plan commun avec l'axe longitudinal (8) de l'alésage à trou borgne (3) et
    - les courbures (30 ; 31) sont dirigées vers l'extrémité ouverte de l'alésage à trou borgne (3) et
    - la distance des points avec la distance maximale (130 ; 131) des courbures (30 ; 31) se réduit constamment dans la direction longitudinale du canal d'injection (7).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la périphérie de l'ouverture d'entrée (20) présente une forme circulaire à l'extérieur de la première courbure (30) et de la deuxième courbure (31).
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la distance des points ayant la plus grande distance (130 ; 131) du point central (28) diminue depuis l'ouverture d'entrée (20) jusqu'à l'ouverture de sortie (22) jusqu'à la valeur du rayon (R) de la forme de base circulaire, de sorte que l'ouverture de sortie (22) se présente sous une forme circulaire.
  4. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le rayon (R) de la forme de base circulaire se réduit constamment depuis l'ouverture d'entrée (20) vers l'ouverture de sortie (22).
  5. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le passage des courbures (30 ; 31) vers la forme de base circulaire est arrondi.
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'arête d'admission sur l'ouverture d'entrée (20) du canal d'injection (7) est arrondie.
EP04730825.9A 2003-07-04 2004-05-03 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1644636B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003130256 DE10330256A1 (de) 2003-07-04 2003-07-04 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/DE2004/000932 WO2005010350A1 (fr) 2003-07-04 2004-05-03 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (3)

Publication Number Publication Date
EP1644636A1 EP1644636A1 (fr) 2006-04-12
EP1644636B1 EP1644636B1 (fr) 2007-04-11
EP1644636B2 true EP1644636B2 (fr) 2016-08-03

Family

ID=33521349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04730825.9A Expired - Lifetime EP1644636B2 (fr) 2003-07-04 2004-05-03 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (3)

Country Link
EP (1) EP1644636B2 (fr)
DE (2) DE10330256A1 (fr)
WO (1) WO2005010350A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008051365B4 (de) 2008-10-15 2010-07-01 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
DE102011007885A1 (de) * 2011-04-21 2012-10-25 Continental Automotive Gmbh Düsenbaugruppe für ein Einspritzventil und Einspritzventil
EP2808533B1 (fr) * 2013-05-29 2019-08-14 Delphi Technologies IP Limited Injecteur à carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370659A1 (fr) † 1988-11-19 1990-05-30 Lucas Industries Public Limited Company Buse d'injection de combustible
DE19507171C1 (de) † 1995-03-02 1996-08-14 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP0890735B1 (fr) † 1997-07-11 2006-10-18 Robert Bosch Gmbh Soupape d'injection de combustible

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0326096A (ja) * 1989-06-22 1991-02-04 Fujitsu Ltd 被監視制御装置のｃｐｕリセット方式
JPH109095A (ja) * 1996-06-21 1998-01-13 Zexel Corp 燃料噴射ノズル
DE19815918A1 (de) * 1998-04-09 1999-10-21 Man B & W Diesel As Brennstoffeinspritzvorrichtung
DE19914719C2 (de) * 1999-03-31 2001-05-03 Siemens Ag Vorrichtung zum hydroerosiven Runden von Einlaufkanten der Spritzlochkanäle in einem Düsenkörper
DE19931890A1 (de) * 1999-07-08 2001-01-18 Siemens Ag Düsenkörper für eine Kraftstoffeinspritzdüse mit optimierter Spritzlochkanalgeometrie
DE10132449A1 (de) * 2001-07-04 2003-01-23 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370659A1 (fr) † 1988-11-19 1990-05-30 Lucas Industries Public Limited Company Buse d'injection de combustible
DE19507171C1 (de) † 1995-03-02 1996-08-14 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP0890735B1 (fr) † 1997-07-11 2006-10-18 Robert Bosch Gmbh Soupape d'injection de combustible

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Diesel- und Benzindirekteeinspritzung", 3. TAGUNG †
"Hydro-erosives Schleifen von Diesel-Einspritzdüsen" †
TSCHÖKE, LEYH ET AL.: "Diesel- und Benzindirekteinspritzung II", HAUS DER TECHNIK FACHBUCH BAND 20, EXPERT-VERLAG, 1., December 2002 (2002-12-01), ESSEN, pages 68 - 77 †

Also Published As

Publication number Publication date
WO2005010350A1 (fr) 2005-02-03
DE502004003489D1 (de) 2007-05-24
EP1644636B1 (fr) 2007-04-11
EP1644636A1 (fr) 2006-04-12
DE10330256A1 (de) 2005-01-20

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