EP3073107B1 - Fuel injection valve for combustion engines and use of the fuel injection valve - Google Patents

Fuel injection valve for combustion engines and use of the fuel injection valve Download PDF

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Publication number
EP3073107B1
EP3073107B1 EP16152533.2A EP16152533A EP3073107B1 EP 3073107 B1 EP3073107 B1 EP 3073107B1 EP 16152533 A EP16152533 A EP 16152533A EP 3073107 B1 EP3073107 B1 EP 3073107B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
section
transition
longitudinal axis
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EP16152533.2A
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German (de)
French (fr)
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EP3073107A1 (en
Inventor
Beate Grota
Gerhard Suenderhauf
Michael Leukart
Uli Herz
Ferdinand Nicolai
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M61/1833—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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1. Furthermore, the invention relates to the use of a fuel injection valve according to the invention.
  • a fuel injection valve according to the preamble of claim 1 is known from the EP 1 599 670 B1 known to the applicant.
  • the known fuel injection valve has a total of three sections in a blind hole in its valve body, which directly adjoin one another in the direction of a longitudinal axis of the blind hole.
  • a first section serves to form a seat section for a sealing surface of a nozzle needle when it is in its lowered closed position.
  • a second, conical section serves as a transition section to a likewise conical third section, in the area of which at least one injection opening is formed.
  • the injection opening is designed as a cylindrical injection opening, the mouth region of which is relatively sharp-edged on the side facing the blind hole.
  • Such a design is to be regarded as disadvantageous from the point of view of fluid mechanics in that it can result in relatively high hydraulic losses in the mouth area of the injection opening due to turbulence.
  • Such different flow speeds over the cross section of the injection opening can be considered, for example, by means of a fuel injection valve according to FIG EP 1 382 840 A1 of the applicant.
  • This has an injection member (nozzle needle) that is non-round or polygonal in cross section in the area of injection openings.
  • an injection member with a round cross section is disclosed with a blind hole which is non-circular or non-uniform in cross section.
  • the invention is based on the object of developing a fuel injection valve for internal combustion engines in accordance with the preamble of claim 1 in such a way that at least an optimization of the flow properties for the fuel is achieved in the sense of minimizing hydraulic losses.
  • a fuel injection valve for internal combustion engines with the characterizing features of claim 1 solved in that the at least one injection opening on the side facing the first section of the blind hole has a convex first inflow region, and in that the first inflow region is viewed in the direction of the longitudinal axis of the blind hole up to the first section in which the seat section for forming the sealing seat is formed with the nozzle needle.
  • the first inflow region forms an egg-shaped recess in the valve body and has a longitudinal axis that runs parallel to the longitudinal axis of the blind hole.
  • Such a configuration of the first inflow region causes the fuel to flow relatively smoothly or uniformly in the region of the first section after passing the seat section and with a small deflection angle in the direction of the at least one injection opening.
  • relatively “gentle” deflections of the fuel lead to relatively low hydraulic losses and thus to an optimization of the flow guidance of the fuel when the fuel is injected into the combustion chamber of an internal combustion engine.
  • a configuration due to the egg-shaped shape causes, in particular between the at least one injection opening and the area of the seat section, a first inflow area which is maximized in length, so that the curvature of the convex first inflow area can be selected to be relatively small in this area.
  • the area below the at least one injection opening is at least substantially without the first inflow area, so that the dead volume in the blind hole in the area below the nozzle needle is minimized.
  • the first section on the side facing the second section has a transition section, that the seat section is arranged on the side of the transition section facing away from the second section, and that the inflow region in the direction of the longitudinal axis of the blind hole extends into the transition section and before the Seating section ends.
  • the seat section there are two sections below the seat section, each with a different shape or a different cross section, which in themselves result in the fuel being guided with less flow losses, since the deflection of the fuel takes place more uniformly compared to a single section can or is reduced.
  • transition section and the seat section are each conical and that the cone angle of the nozzle seat section is greater than that of the transition section.
  • the second section has a cylindrical basic shape.
  • An optimization of the fuel injection valve with regard to the tendency towards the smallest possible deposits in the area of the injection openings is achieved if several injection openings are provided, areas in which no first inflow areas are formed are formed between the injection openings in the circumferential direction of the blind hole. Due to the fact that in the areas in which no first inflow areas are formed, the fuel is deflected more strongly in the direction of the injection opening, additional turbulence is generated in these areas, which reduces the tendency towards deposits in the mouth area of the blind hole.
  • the use of the fuel injection valve according to the invention is particularly advantageous in self-igniting internal combustion engines in which the system pressure is more than 2000 bar.
  • a fuel injection valve 10 in the Fig. 1 The end region of a fuel injection valve 10 according to the invention facing a combustion chamber (not shown) of an internal combustion engine is shown.
  • the fuel injection valve 10 is preferably part of a so-called common rail system for self-igniting internal combustion engines, the system pressure in particular being more than 2000 bar.
  • the fuel injection valve 10 has a valve body 11, in which a blind bore 12 with a longitudinal axis 13 is formed.
  • the blind hole 12 has a first section 15, in the area of which a seat section 16 is formed which, in a lowered position, forms a sealing seat with a nozzle needle 20 serving as an injection element together with a sealing surface 21 of the nozzle needle 20.
  • the nozzle needle 20 is only shown in sections for reasons of better clarity.
  • the first section 15 of the blind bore 12 is conical in the exemplary embodiment shown, but can in principle be equipped with a convex surface or have a radius.
  • a second section 22 adjoins the first section 15 in the direction of the base 26 of the blind hole 12.
  • a plurality of injection openings 25 are preferably formed in the valve body 11 in order to enable the fuel to be injected into the combustion chamber (not shown) of the internal combustion engine.
  • the injection openings 25 are located with respect to the longitudinal axis 13 within the blind hole 12 on a pitch circle diameter around the longitudinal axis 13 and in the exemplary embodiment shown do not run at right angles to the longitudinal axis 13, but rather at an angle thereto.
  • the second section 22, which in the exemplary embodiment shown has a cylindrical basic shape, extends in the axial direction of the longitudinal axis 13, at least over the entire area of the injection openings 25.
  • the curved section 26 of the blind hole 12 is connected to the second section 22 of the blind hole 12 at.
  • a radially circumferential transition 28 is arranged between the two sections 15, 22 with respect to the longitudinal axis 13, which transition can either be in the form of an edge or in the form of a radius.
  • the mouth region 30 of the injection openings 25, which have, for example, a constant cross section or constant diameter, is formed on the side facing the blind hole 12 with an inflow region 31.
  • the inflow region 31 is formed with a radius r at least in the direction of the first section 15, but preferably radially circumferentially with respect to the injection opening 25.
  • the injection openings 25 are provided with a further, convex inflow region 32 which completely surrounds the inflow region 31.
  • the further inflow region 32 is designed as an egg-shaped recess 33 within the wall of the blind hole 12.
  • the further inflow region 32 has a longitudinal axis 34 which extends at least substantially parallel to the longitudinal axis 13 of the blind hole 12. It is essential to the invention that the further inflow region 32, which extends in the direction of the bottom 26 of the blind bore 12 only slightly beyond the region of the injection opening 25, extends beyond the transition 28 on the side facing the first section 15. In the exemplary embodiment shown, the further inflow regions 32 only extend somewhat over the transition 28 into the area of the first section 15. Furthermore, viewed in the circumferential direction, regions 29 without inflow regions 32 are formed in the blind hole 12 between the further inflow regions 32, such that the wall of the blind hole 12 is formed exclusively by the shape of the second section 22.
  • the further inflow region 32 has a convex wall 35, it being possible for the convex shape of the wall 35 to be formed, for example, by a constant radius.
  • the curvature of the further inflow region 32 is less than the curvature or the radius r of the inflow region 31.
  • the first section 15a has a transition section 36 on the side facing the second section 22.
  • the transition section 36 is likewise conical by way of example, the cone angle of the transition section 36 being smaller than the cone angle of the first section 15a in the region of the seat section 16a.
  • the transition 28 is formed between the transition section 36 and the second section 22 and a second transition 37 is formed between the transition section 36 and the seat section 16a.
  • the further inflow regions 32 extend beyond the transition 28 into the region of the transition section 36, but without reaching into the region of the second transition 37.
  • the fuel injection valve 10, 10a described so far can be modified or modified in a variety of ways without deviating from the inventive concept.
  • the shape of the inflow region 32 is not intended to be limited to a convex shape, but can also be designed, for example, in the form of a funnel or cone.

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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)

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung die Verwendung eines erfindungsgemäßen Kraftstoffeinspritzventils.The invention relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1. Furthermore, the invention relates to the use of a fuel injection valve according to the invention.

Ein Kraftstoffeinspritzventil nach dem Oberbegriff des Anspruchs 1 ist aus der EP 1 599 670 B1 der Anmelderin bekannt. Das bekannte Kraftstoffeinspritzventil weist in einer Sacklochbohrung seines Ventilkörpers insgesamt drei Abschnitte auf, die in Richtung einer Längsachse der Sacklochbohrung unmittelbar aneinander anschließen. Ein erster Abschnitt dient dazu, einen Sitzabschnitt für eine Dichtfläche einer Düsennadel auszubilden, wenn sich diese in ihrer abgesenkten Schließposition befindet. Ein zweiter, konisch ausgebildeter Abschnitt dient als Übergangsabschnitt zu einem ebenfalls konisch ausgebildeten dritten Abschnitt, in dessen Bereich wenigstens eine Einspritzöffnung ausgebildet ist. Die Einspritzöffnung ist als zylindrisch ausgebildete Einspritzöffnung ausgebildet, deren Mündungsbereich auf der der Sacklochbohrung zugewandten Seite relativ scharfkantig ausgebildet ist. Eine derartige Ausbildung ist aus strömungstechnischer Sicht insofern als nachteilhaft anzusehen, als dass dadurch relativ hohe hydraulische Verluste im Mündungsbereich der Einspritzöffnung durch Verwirbelungen auftreten können.A fuel injection valve according to the preamble of claim 1 is known from the EP 1 599 670 B1 known to the applicant. The known fuel injection valve has a total of three sections in a blind hole in its valve body, which directly adjoin one another in the direction of a longitudinal axis of the blind hole. A first section serves to form a seat section for a sealing surface of a nozzle needle when it is in its lowered closed position. A second, conical section serves as a transition section to a likewise conical third section, in the area of which at least one injection opening is formed. The injection opening is designed as a cylindrical injection opening, the mouth region of which is relatively sharp-edged on the side facing the blind hole. Such a design is to be regarded as disadvantageous from the point of view of fluid mechanics in that it can result in relatively high hydraulic losses in the mouth area of the injection opening due to turbulence.

Weiterhin ist aus der DE 10 2008 041 676 A1 der Anmelderin ein Kraftstoffeinspritzventil bekannt geworden, dessen konisch ausgebildete Einspritzöffnung auf der der Sacklochbohrung zugewandten Seite mit einem Radius versehen ist, so dass ein gerundet ausgebildeter Einströmbereich ausgebildet wird. Der Einströmbereich ist ausschließlich in dem Bereich bzw. dem Abschnitt der Sacklochbohrung ausgebildet, in der sich auch die wenigstens eine Einspritzöffnung befindet. Darüber hinaus ist aus DE 10 2012 211 156 A1 ein Kraftstoffinjektor bekannt mit verrundeten Übergängen in die Einspritzöffnungen. Auch aus WO 2005/103481 A1 ist eine Kraftstoffeinspritzdüse bekannt, die Einspritzöffnungen mit verrundeten Einlaufbereichen zeigt.Furthermore, from the DE 10 2008 041 676 A1 the applicant has become aware of a fuel injection valve whose conically shaped injection opening is provided with a radius on the side facing the blind hole, so that a rounded inflow region is formed. The inflow region is formed exclusively in the region or section of the blind hole in which the at least one injection opening is also located. Beyond that DE 10 2012 211 156 A1 a fuel injector known with rounded transitions into the injection openings. Also from WO 2005/103481 A1 a fuel injection nozzle is known which shows injection openings with rounded inlet areas.

Neben dem Ziel einer strömungstechnisch optimierten bzw. mit möglichst wenig hydraulischen Verlusten versehenen Strömung des Kraftstoffs ist es darüber hinaus bei einem gattungsgemäßen Kraftstoffeinspritzventil wünschenswert, insbesondere über die Betriebsdauer des Kraftstoffeinspritzventils betrachtet, die Tendenz zu Ablagerungen im Bereich der wenigstens einen Einspritzöffnung auf der Seite der Sacklochbohrung zu vermindern. Hierbei hat es sich herausgestellt, dass es vorteilhaft ist, eine ausgeprägte lokale Umlenkung der Kraftstoffströmung auszubilden. Derartige ausgeprägte lokale Umlenkungen erzeugen unterschiedliche Strömungsgeschwindigkeiten mit Strömungsturbulenzen und damit einhergehend eine verstärkte Reinigung von ggf. vorhandenen Belägen im Bereich der Einspritzöffnung in der Sacklochbohrung.In addition to the aim of a flow of the fuel that is optimized in terms of flow technology or provided with as few hydraulic losses as possible, it is also desirable with a generic fuel injection valve, particularly when looking at the operating time of the fuel injection valve, the tendency towards deposits in the region of the at least one injection opening on the side of the blind hole to diminish. It has been found here that it is advantageous to design a pronounced local deflection of the fuel flow. Such pronounced local deflections produce different flow velocities with flow turbulence and, as a result, an increased cleaning of any deposits that may be present in the area of the injection opening in the blind hole.

Derartige unterschiedliche Strömungsgeschwindigkeiten über den Querschnitt der Einspritzöffnung betrachtet lassen sich beispielsweise mittels eines Kraftstoffeinspritzventils gemäß der EP 1 382 840 A1 der Anmelderin erzielen. Diese weist ein im Querschnitt im Bereich von Einspritzöffnungen unrund bzw. vieleckförmig ausgebildetes Einspritzglied (Düsennadel) auf. Alternativ ist ein im Querschnitt rund ausgebildetes Einspritzglied mit einer im Querschnitt unrunden oder ungleichförmigen Sacklochbohrung offenbart.Such different flow speeds over the cross section of the injection opening can be considered, for example, by means of a fuel injection valve according to FIG EP 1 382 840 A1 of the applicant. This has an injection member (nozzle needle) that is non-round or polygonal in cross section in the area of injection openings. Alternatively, an injection member with a round cross section is disclosed with a blind hole which is non-circular or non-uniform in cross section.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Kraftstoffeinspritzventil für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass zumindest eine Optimierung der Strömungseigenschaften für den Kraftstoff im Sinne einer Minimierung hydraulischer Verluste erzielt wird.Starting from the prior art shown, the invention is based on the object of developing a fuel injection valve for internal combustion engines in accordance with the preamble of claim 1 in such a way that at least an optimization of the flow properties for the fuel is achieved in the sense of minimizing hydraulic losses.

Diese Aufgabe wird erfindungsgemäß bei einem Kraftstoffeinspritzventil für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Anspruchs 1 dadurch gelöst, dass die wenigstens eine Einspritzöffnung auf der dem ersten Abschnitt der Sacklochbohrung zugewandten Seite einen konvex ausgebildeten ersten Einströmbereich aufweist, und dass der erste Einströmbereich in Richtung der Längsachse der Sacklochbohrung betrachtet bis in den ersten Abschnitt, in dem der Sitzabschnitt zur Ausbildung des Dichtsitzes mit der Düsennadel ausgebildet ist, hineinreicht. Der erste Einströmbereich bildet im Ventilkörper dabei eine eiförmige Ausnehmung aus und weist eine Längsachse auf, die parallel zur Längsachse der Sacklochbohrung verläuft.This object is achieved in a fuel injection valve for internal combustion engines with the characterizing features of claim 1 solved in that the at least one injection opening on the side facing the first section of the blind hole has a convex first inflow region, and in that the first inflow region is viewed in the direction of the longitudinal axis of the blind hole up to the first section in which the seat section for forming the sealing seat is formed with the nozzle needle. The first inflow region forms an egg-shaped recess in the valve body and has a longitudinal axis that runs parallel to the longitudinal axis of the blind hole.

Eine derartige Ausgestaltung des ersten Einströmbereichs bewirkt, dass der Kraftstoff nach dem Passieren des Sitzabschnitts im Bereich des ersten Abschnitts relativ sanft bzw. gleichförmig und mit geringem Umlenkwinkel in Richtung der wenigstens einen Einspritzöffnung strömt. Derartige, relativ "sanfte" Umlenkungen des Kraftstoffs führen zu relativ geringen hydraulischen Verlusten und somit zu einer Optimierung der Strömungsführung des Kraftstoffs beim Einspritzen des Kraftstoffs in den Brennraum einer Brennkraftmaschine.Such a configuration of the first inflow region causes the fuel to flow relatively smoothly or uniformly in the region of the first section after passing the seat section and with a small deflection angle in the direction of the at least one injection opening. Such, relatively "gentle" deflections of the fuel lead to relatively low hydraulic losses and thus to an optimization of the flow guidance of the fuel when the fuel is injected into the combustion chamber of an internal combustion engine.

Eine Ausgestaltung durch die eiförmige Form bewirkt insbesondere zwischen der wenigstens einen Einspritzöffnung und dem Bereich des Sitzabschnitts einen hinsichtlich der Länge maximierten ersten Einströmbereich, so dass die Wölbung des konvex ausgebildeten ersten Einströmbereichs in diesem Bereich relativ gering gewählt werden kann. Darüber hinaus ist dadurch der Bereich unterhalb der wenigstens einen Einspritzöffnung zumindest im Wesentlichen ohne den ersten Einströmbereich ausgebildet, so dass das Totvolumen in der Sacklochbohrung in dem Bereich unterhalb der Düsennadel minimiert wird.A configuration due to the egg-shaped shape causes, in particular between the at least one injection opening and the area of the seat section, a first inflow area which is maximized in length, so that the curvature of the convex first inflow area can be selected to be relatively small in this area. In addition, the area below the at least one injection opening is at least substantially without the first inflow area, so that the dead volume in the blind hole in the area below the nozzle needle is minimized.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Kraftstoffeinspritzventils für Brennkraftmaschinen sind in den Unteransprüchen aufgeführt.Advantageous developments of the fuel injection valve according to the invention for internal combustion engines are listed in the subclaims.

In einer bevorzugten Ausgestaltung des Kraftstoffeinspritzventils, welche sich durch nochmals verringerte hydraulische Strömungsverluste auszeichnet, wird vorgeschlagen, dass der erste Abschnitt auf der dem zweiten Abschnitt zugewandten Seite einen Übergangsabschnitt aufweist, dass der Sitzabschnitt auf der dem zweiten Abschnitt abgewandten Seite des Übergangsabschnitts angeordnet ist, und dass der Einströmbereich in Richtung der Längsachse der Sacklochbohrung betrachtet in den Übergangsabschnitt hineinreicht und vor dem Sitzabschnitt endet. Es schließen sich somit erfindungsgemäß unterhalb des Sitzabschnitts zwei, eine unterschiedliche Form bzw. einen unterschiedlichen Querschnitt aufweisende Abschnitte an, welche für sich genommen eine mit weniger Strömungsverlusten behaftete Führung für den Kraftstoff bewirken, da die Umlenkung des Kraftstoffs im Vergleich zu einem einzigen Abschnitt gleichmäßiger erfolgen kann bzw. verringert ist.In a preferred embodiment of the fuel injection valve, which is characterized by further reduced hydraulic flow losses, it is proposed that the first section on the side facing the second section has a transition section, that the seat section is arranged on the side of the transition section facing away from the second section, and that the inflow region in the direction of the longitudinal axis of the blind hole extends into the transition section and before the Seating section ends. Thus, according to the invention, there are two sections below the seat section, each with a different shape or a different cross section, which in themselves result in the fuel being guided with less flow losses, since the deflection of the fuel takes place more uniformly compared to a single section can or is reduced.

In Weiterbildung ist es insbesondere bei der zuletzt genannten Ausführungsform vorgesehen, dass der Übergangsabschnitt und der Sitzabschnitt jeweils konisch ausgebildet ist, und dass der Konuswinkel des Düsensitzabschnitts größer ist als der des Übergangsabschnitts.In a further development, it is provided in particular in the last-mentioned embodiment that the transition section and the seat section are each conical and that the cone angle of the nozzle seat section is greater than that of the transition section.

Um die Sacklochbohrung trotz des Vorsehens unterschiedlich geformter Abschnitte herstellungstechnisch besonders vorteilhaft bzw. einfach ausbilden zu können, ist es darüber hinaus von Vorteil, wenn der zweite Abschnitt eine zylindrische Grundform aufweist.In order to be able to construct the blind hole particularly advantageously or simply in spite of the provision of differently shaped sections, it is also advantageous if the second section has a cylindrical basic shape.

Eine Optimierung des Kraftstoffeinspritzventils hinsichtlich der Tendenz zu möglichst geringen Ablagerungen im Bereich der Einspritzöffnungen wird erzielt, wenn mehrere Einspritzöffnungen vorgesehen sind, wobei zwischen den Einspritzöffnungen in Umfangsrichtung der Sacklochbohrung betrachtet Bereiche ausgebildet sind, in denen keine ersten Einströmbereiche ausgebildet sind. Dadurch, dass in den Bereichen, in denen keine ersten Einströmbereiche ausgebildet sind, eine stärkere Umlenkung des Kraftstoffs in Richtung der Einspritzöffnung erfolgt, werden in diesen Bereichen zusätzliche Turbulenzen erzeugt, die die Tendenz zu Ablagerungen im Mündungsbereich der Sacklochbohrung verringern.An optimization of the fuel injection valve with regard to the tendency towards the smallest possible deposits in the area of the injection openings is achieved if several injection openings are provided, areas in which no first inflow areas are formed are formed between the injection openings in the circumferential direction of the blind hole. Due to the fact that in the areas in which no first inflow areas are formed, the fuel is deflected more strongly in the direction of the injection opening, additional turbulence is generated in these areas, which reduces the tendency towards deposits in the mouth area of the blind hole.

Aus strömungstechnischer Sicht besonders vorteilhaft ist der Einsatz des erfindungsgemäßen Kraftstoffeinspritzventils bei selbstzündenden Brennkraftmaschinen, bei denen der Systemdruck mehr als 2000bar beträgt.From a fluidic point of view, the use of the fuel injection valve according to the invention is particularly advantageous in self-igniting internal combustion engines in which the system pressure is more than 2000 bar.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung.Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing.

Diese zeigt in:

  • Fig. 1
    und
    Fig. 2 jeweils im Längsschnitt unterschiedliche Ausführungsformen eines erfindungsgemäßen Kraftstoffeinspritzventils für eine Brennkraftmaschine in dem einem Brennraum der Brennkraftmaschine zugewandten Endbereich.
This shows in:
  • Fig. 1
    and
    Fig. 2 in each case in longitudinal section different embodiments of a fuel injection valve according to the invention for an internal combustion engine in the end region facing a combustion chamber of the internal combustion engine.

Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen.The same elements or elements with the same function are provided with the same reference numbers in the figures.

In der Fig. 1 ist der einem nicht gezeigten Brennraum einer Brennkraftmaschine zugewandte Endbereich eines erfindungsgemäßen Kraftstoffeinspritzventils 10 gezeigt. Das Kraftstoffeinspritzventil 10 ist vorzugsweise Bestandteil eines sogenannten Common-Rail-Systems für selbstzündende Brennkraftmaschinen, wobei der Systemdruck insbesondere mehr als 2000bar beträgt.In the Fig. 1 The end region of a fuel injection valve 10 according to the invention facing a combustion chamber (not shown) of an internal combustion engine is shown. The fuel injection valve 10 is preferably part of a so-called common rail system for self-igniting internal combustion engines, the system pressure in particular being more than 2000 bar.

Das Kraftstoffeinspritzventil 10 weist einen Ventilkörper 11 auf, in dem eine Sacklochbohrung 12 mit einer Längsachse 13 ausgebildet ist. Die Sacklochbohrung 12 weist einen ersten Abschnitt 15 auf, in dessen Bereich ein Sitzabschnitt 16 ausgebildet ist, der in einer abgesenkten Stellung mit einer als Einspritzglied dienenden Düsennadel 20 zusammen mit einer Dichtfläche 21 der Düsennadel 20 einen Dichtsitz ausbildet. In der Fig. 1 ist die Düsennadel 20 aus Gründen der besseren Übersichtlichkeit lediglich abschnittsweise gezeigt. Der erste Abschnitt 15 der Sacklochbohrung 12 ist im dargestellten Ausführungsbeispiel konisch ausgebildet, kann jedoch grundsätzlich mit einer konvexen Oberfläche ausgestattet sein bzw. einen Radius aufweisen.The fuel injection valve 10 has a valve body 11, in which a blind bore 12 with a longitudinal axis 13 is formed. The blind hole 12 has a first section 15, in the area of which a seat section 16 is formed which, in a lowered position, forms a sealing seat with a nozzle needle 20 serving as an injection element together with a sealing surface 21 of the nozzle needle 20. In the Fig. 1 the nozzle needle 20 is only shown in sections for reasons of better clarity. The first section 15 of the blind bore 12 is conical in the exemplary embodiment shown, but can in principle be equipped with a convex surface or have a radius.

In Richtung des Grunds 26 der Sacklochbohrung 12 schließt sich an den ersten Abschnitt 15 ein zweiter Abschnitt 22 an. Innerhalb des zweiten Abschnitts 22 sind vorzugsweise mehrere Einspritzöffnungen 25 in dem Ventilkörper 11 ausgebildet, um das Einspritzen des Kraftstoffs in den nicht gezeigten Brennraum der Brennkraftmaschine zu ermöglichen. Die Einspritzöffnungen 25 befinden sich in Bezug auf die Längsachse 13 innerhalb der Sacklochbohrung 12 auf einem Teilkreisdurchmesser um die Längsachse 13 und verlaufen im dargestellten Ausführungsbeispiel nicht rechtwinklig zur Längsachse 13, sondern etwas schräg hierzu. Der zweite Abschnitt 22, der im dargestellten Ausführungsbeispiel eine zylindrische Grundform aufweist, erstreckt sich in axialer Richtung der Längsachse 13 betrachtet zumindest über den gesamten Bereich der Einspritzöffnungen 25. An den zweiten Abschnitt 22 der Sacklochbohrung 12 schließt sich der gewölbt ausgebildete Grund 26 der Sacklochbohrung 12 an.A second section 22 adjoins the first section 15 in the direction of the base 26 of the blind hole 12. Within the second section 22, a plurality of injection openings 25 are preferably formed in the valve body 11 in order to enable the fuel to be injected into the combustion chamber (not shown) of the internal combustion engine. The injection openings 25 are located with respect to the longitudinal axis 13 within the blind hole 12 on a pitch circle diameter around the longitudinal axis 13 and in the exemplary embodiment shown do not run at right angles to the longitudinal axis 13, but rather at an angle thereto. The second section 22, which in the exemplary embodiment shown has a cylindrical basic shape, extends in the axial direction of the longitudinal axis 13, at least over the entire area of the injection openings 25. The curved section 26 of the blind hole 12 is connected to the second section 22 of the blind hole 12 at.

Zwischen den beiden Abschnitten 15, 22 ist in Bezug zur Längsachse 13 ein radial umlaufender Übergang 28 angeordnet, der entweder in Form einer Kante, oder aber in Form eines Radius ausgebildet sein kann. Der Mündungsbereich 30 der beispielhaft einen konstanten Querschnitt bzw. konstanten Durchmesser aufweisenden Einspritzöffnungen 25 ist auf der der Sacklochbohrung 12 zugewandten Seite mit einem Einströmbereich 31 ausgebildet. Der Einströmbereich 31 ist zumindest in Richtung des ersten Abschnitts 15 hin, vorzugsweise jedoch radial umlaufend in Bezug zur Einspritzöffnung 25, mit einem Radius r ausgebildet. Darüber hinaus ist es vorgesehen, dass die Einspritzöffnungen 25 mit einem weiteren, konvex ausgebildeten Einströmbereich 32 versehen sind, der den Einströmbereich 31 vollständig umgibt. Der weitere Einströmbereich 32 ist als eiförmige Ausnehmung 33 innerhalb der Wandung der Sacklochbohrung 12 ausgebildet. Darüber hinaus weist der weitere Einströmbereich 32 eine Längsachse 34 auf, die sich zumindest im Wesentlichen parallel zur Längsachse 13 der Sacklochbohrung 12 erstreckt. Erfindungswesentlich ist, dass der weitere Einströmbereich 32, der sich in Richtung des Grunds 26 der Sacklochbohrung 12 nur geringfügig über den Bereich der Einspritzöffnung 25 hinaus erstreckt, auf der dem ersten Abschnitt 15 zugewandten Seite bis über den Übergang 28 hinaus erstreckt. Im dargestellten Ausführungsbeispiel reichen die weiteren Einströmbereiche 32 lediglich etwas über den Übergang 28 in den Bereich des ersten Abschnitts 15 hinein. Weiterhin sind zwischen den weiteren Einströmbereichen 32 in Umfangsrichtung betrachtet in der Sacklochbohrung 12 Bereiche 29 ohne Einströmbereiche 32 ausgebildet, derart, dass die Wand der Sacklochbohrung 12 ausschließlich durch die Form des zweiten Abschnitts 22 gebildet ist.A radially circumferential transition 28 is arranged between the two sections 15, 22 with respect to the longitudinal axis 13, which transition can either be in the form of an edge or in the form of a radius. The mouth region 30 of the injection openings 25, which have, for example, a constant cross section or constant diameter, is formed on the side facing the blind hole 12 with an inflow region 31. The inflow region 31 is formed with a radius r at least in the direction of the first section 15, but preferably radially circumferentially with respect to the injection opening 25. In addition, it is provided that the injection openings 25 are provided with a further, convex inflow region 32 which completely surrounds the inflow region 31. The further inflow region 32 is designed as an egg-shaped recess 33 within the wall of the blind hole 12. In addition, the further inflow region 32 has a longitudinal axis 34 which extends at least substantially parallel to the longitudinal axis 13 of the blind hole 12. It is essential to the invention that the further inflow region 32, which extends in the direction of the bottom 26 of the blind bore 12 only slightly beyond the region of the injection opening 25, extends beyond the transition 28 on the side facing the first section 15. In the exemplary embodiment shown, the further inflow regions 32 only extend somewhat over the transition 28 into the area of the first section 15. Furthermore, viewed in the circumferential direction, regions 29 without inflow regions 32 are formed in the blind hole 12 between the further inflow regions 32, such that the wall of the blind hole 12 is formed exclusively by the shape of the second section 22.

Der weitere Einströmbereich 32 weist eine konvex ausgebildete Wand 35 auf, wobei die konvexe Form der Wand 35 beispielsweise auch durch einen konstanten Radius gebildet sein kann. Darüber hinaus ist die Wölbung des weiteren Einströmbereichs 32 geringer als die Wölbung bzw. der Radius r des Einströmbereichs 31.The further inflow region 32 has a convex wall 35, it being possible for the convex shape of the wall 35 to be formed, for example, by a constant radius. In addition, the curvature of the further inflow region 32 is less than the curvature or the radius r of the inflow region 31.

Bei dem in der Fig. 2 dargestellten Ausführungsbeispiel des Kraftstoffeinspritzventils 10a weist der erste Abschnitt 15a auf der den zweiten Abschnitt 22 zugewandten Seite einen Übergangsabschnitt 36 auf. Der Übergangsabschnitt 36 ist beispielhaft ebenfalls konisch ausgebildet, wobei der Konuswinkel des Übergangsabschnitts 36 geringer ist als der Konuswinkel des ersten Abschnitts 15a im Bereich des Sitzabschnitts 16a. Darüber hinaus ist zwischen dem Übergangsabschnitt 36 und dem zweiten Abschnitt 22 der Übergang 28 ausgebildet und zwischen dem Übergangsabschnitt 36 und dem Sitzabschnitt 16a ein zweiter Übergang 37.The one in the Fig. 2 In the illustrated embodiment of the fuel injection valve 10a, the first section 15a has a transition section 36 on the side facing the second section 22. The transition section 36 is likewise conical by way of example, the cone angle of the transition section 36 being smaller than the cone angle of the first section 15a in the region of the seat section 16a. In addition, the transition 28 is formed between the transition section 36 and the second section 22 and a second transition 37 is formed between the transition section 36 and the seat section 16a.

Bei dem in der Fig. 2 dargestellten Ausführungsbeispiel reichen die weiteren Einströmbereiche 32 in Analogie zum ersten Ausführungsbeispiel in axialer Richtung der Längsachse 13 der Sacklochbohrung 12a betrachtet bis über den Übergang 28 hinaus in den Bereich des Übergangsabschnitts 36 hinein, ohne jedoch bis in den Bereich des zweiten Übergangs 37 zu reichen.The one in the Fig. 2 In the illustrated embodiment, the further inflow regions 32, analogous to the first embodiment, viewed in the axial direction of the longitudinal axis 13 of the blind bore 12a, extend beyond the transition 28 into the region of the transition section 36, but without reaching into the region of the second transition 37.

Das soweit beschriebene Kraftstoffeinspritzventil 10, 10a kann in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen. So soll die Form des Einströmbereichs 32 nicht auf eine konvexe Form beschränkt sein, sondern kann beispielsweise auch trichter- bzw. kegelförmig ausgebildet sein.The fuel injection valve 10, 10a described so far can be modified or modified in a variety of ways without deviating from the inventive concept. For example, the shape of the inflow region 32 is not intended to be limited to a convex shape, but can also be designed, for example, in the form of a funnel or cone.

Claims (5)

  1. Fuel injection valve (10; 10a) for internal combustion engines, having a valve body (11) in which a blind bore (12; 12a) with a longitudinal axis (13) is formed, wherein the blind bore (12; 12a) has a first portion (15; 15a), which forms a seat portion (16; 16a) for a sealing surface (21) of a nozzle needle (20), and with a second portion (22), in the region of which at least one injection opening (25) is formed, wherein the two portions (15; 15a, 22) are differently shaped such that a transition (28) is formed between the two portions (15; 15a, 22) in the direction of the longitudinal axis (13), wherein the first portion (15) is conical and the second portion (22) has a cylindrical basic shape,
    characterized
    in that the at least one injection opening (25) has a convexly formed first inflow region (32) on the side facing towards the first portion (15; 15a) of the blind bore (12; 12a), and in that the first inflow region (32), as viewed in the direction of the longitudinal axis (13), is formed beyond the transition (28) as far as into the first portion (15; 15a), wherein the first inflow region (32) forms an ovoid recess (33) in the valve body (11) and has a longitudinal axis (34) which runs parallel to the longitudinal axis (13) of the blind bore (12; 12a) .
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the first portion (15a) has a transition portion (36) on the side facing towards the second portion (22), in that the seat portion (16a) is arranged on that side of the transition portion (36) which is averted from the second portion (22), and in that the first inflow region (32), as viewed in the direction of the longitudinal axis (13) of the blind bore (12a), extends into the transition portion (36) and ends before the seat portion (16a).
  3. Fuel injection valve according to Claim 2,
    characterized
    in that the transition portion (36) and the seat portion (16a) are each of conical form, and in that the cone angle of the seat portion (16a) is greater than that of the transition portion (36).
  4. Fuel injection valve according to any of Claims 1 to 3,
    characterized
    in that multiple injection openings (25) are provided, and in that, between the injection openings (25) as viewed in a circumferential direction, there are formed regions in which no first inflow regions (32) are formed.
  5. Use of a fuel injection valve (10; 10a) according to any of Claims 1 to 4 in auto-ignition internal combustion engines, wherein the system pressure amounts to more than 2000 bar.
EP16152533.2A 2015-03-25 2016-01-25 Fuel injection valve for combustion engines and use of the fuel injection valve Active EP3073107B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015205423.3A DE102015205423A1 (en) 2015-03-25 2015-03-25 Fuel injection valve for internal combustion engines and use of the fuel injection valve

Publications (2)

Publication Number Publication Date
EP3073107A1 EP3073107A1 (en) 2016-09-28
EP3073107B1 true EP3073107B1 (en) 2020-05-27

Family

ID=55229608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16152533.2A Active EP3073107B1 (en) 2015-03-25 2016-01-25 Fuel injection valve for combustion engines and use of the fuel injection valve

Country Status (2)

Country Link
EP (1) EP3073107B1 (en)
DE (1) DE102015205423A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10232049A1 (en) 2002-07-16 2004-02-05 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
DE10307873A1 (en) 2003-02-25 2004-09-02 Robert Bosch Gmbh Blind hole and seat hole injection nozzle for an internal combustion engine with a transition cone between the blind hole and nozzle needle seat
DE102004020175A1 (en) * 2004-04-24 2005-11-17 Robert Bosch Gmbh Fuel injector for diesel internal combustion engines
DE102008041676A1 (en) 2008-08-29 2010-03-04 Robert Bosch Gmbh Fuel injector
JP2010180763A (en) * 2009-02-04 2010-08-19 Nippon Soken Inc Fuel injection nozzle
DE102012211156A1 (en) * 2012-06-28 2014-01-23 Robert Bosch Gmbh Fuel injector for combustion chamber of internal combustion engine, has nozzle needle end region that is extended towards longitudinal axis of guide ribs, and flow gap that is formed between guide ribs and end section
BR112015016188A2 (en) * 2013-01-11 2017-07-11 Kw Tech Gmbh & Co Kg device for spraying liquid in an operating chamber

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
DE102015205423A1 (en) 2016-09-29
EP3073107A1 (en) 2016-09-28

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