WO2005010350A1 - Fuel injection valve for combustion engines - Google Patents

Fuel injection valve for combustion engines Download PDF

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Publication number
WO2005010350A1
WO2005010350A1 PCT/DE2004/000932 DE2004000932W WO2005010350A1 WO 2005010350 A1 WO2005010350 A1 WO 2005010350A1 DE 2004000932 W DE2004000932 W DE 2004000932W WO 2005010350 A1 WO2005010350 A1 WO 2005010350A1
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WO
WIPO (PCT)
Prior art keywords
fuel injection
injection valve
valve according
bulge
bulges
Prior art date
Application number
PCT/DE2004/000932
Other languages
German (de)
French (fr)
Inventor
Heribert Duetsch
Guillermo Urzua
Original Assignee
Robert Bosch Gmbh
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33521349&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005010350(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP04730825.9A priority Critical patent/EP1644636B2/en
Priority to DE502004003489T priority patent/DE502004003489D1/en
Publication of WO2005010350A1 publication Critical patent/WO2005010350A1/en

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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 known, for example, from JP 11-117833 and has a valve body in which a blind bore is formed.
  • a valve seat is formed at the bottom of the blind bore, with which a valve needle arranged in the blind bore interacts.
  • At the bottom of the blind bore at least one injection channel is also formed, which connects the interior formed by the blind bore to the combustion chamber of the internal combustion engine and which has an inlet opening and an outlet opening. Controlled by the valve needle, which interacts with the valve seat, fuel is injected from the blind bore into the combustion chamber of the internal combustion engine through this injection channel.
  • the injection channel is usually essentially cylindrical, in particular the inlet opening can be modified. From JP 11-117833, however, other shapes 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 can - depending on the type of fuel injection valve - lead to an improvement in the combustion process. However, all the shapes shown there have in common that they influence the inflow conditions from the valve seat into the injection channel not considered sufficiently.
  • the one in 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 spray hole, so that pressure losses occur in the injection channel, which impair the spray formation of the fuel when it is injected into the combustion chamber can.
  • the fuel injection valve according to the invention with the characterizing features of patent claim 1 has the advantage over the prior art that the inlet cross section of the injection channel is designed in such a way that the fuel can be introduced from the blind bore into the injection channel with little loss, which increases the convertible injection pressure and the atomization of the Fuel positively influenced during the injection process.
  • the inlet openings viewed in cross section, have a circular basic shape with a radius, a first bulge being formed over a first angular area of the circumference of the circular basic shape, the angular area of which is less than 180 °.
  • a second bulge is provided in the circular basic shape, which is mirror-symmetrical to the first bulge, the mirror plane passing through the center of the circular basic shape.
  • both bulges are arranged 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 °. Based on flow tests, it could be shown that such recesses optimally support the inflows of the fuel and lead to a maximization of the speed and thus an improvement in the injection conditions.
  • Advantageous refinements of the subject matter of the invention are possible through the subclaims.
  • the bulges decrease continuously from the inlet opening to the outlet opening, so that the outlet opening corresponds at least approximately to a circular shape.
  • the passage cross section of the injection channel is reduced 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, that is to say it 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 advantageously oriented in a common plane with the longitudinal axis of the blind bore, so that a fuel flows symmetrically into the injection channel with respect to the mirror plane.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention
  • FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole
  • FIG. 3 shows an enlarged view of the inner wall of the blind hole with an injection channel
  • Figure 4 shows the inlet opening of the injection channel
  • Figure 5A to
  • FIG. 5E each show cross sections through the injection channel at equidistant intervals, as shown in FIG. 2.
  • a fuel injection valve according to the invention is shown in longitudinal section in FIG.
  • a blind bore 3 is formed in a valve body 1, which has a longitudinal axis 8 and at the bottom of which a substantially conical valve seat 11 is formed.
  • a blind bore 9 adjoins the valve seat 11, from which a plurality of injection channels 7 extend.
  • the injection channels 7 open into the combustion chamber of the internal combustion engine in the installed position of the fuel injection valve.
  • a piston-shaped valve needle 5 is arranged to be longitudinally displaceable, which is guided in a guided section 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 end on the valve seat side into an essentially conical valve sealing surface 17 which cooperates with the valve seat 11.
  • the blind bore 3 is expanded radially and thus forms a pressure chamber 19 which continues as an annular channel between the valve needle 5 and the blind bore 3 up to the valve seat 11.
  • an inlet channel 25 runs in the valve body 1, 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 interaction of the hydraulic forces on the pressure shoulder 13 and the closing force. Lies the valve needle 5 on the valve seat 11, the pressure chamber 19 is sealed. However, if the valve needle 5 lifts 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 identified by II in FIG. 1.
  • the injection channels 7, which start from the blind hole, have an essentially 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 emerges and is injected into the combustion chamber, on the outer wall of the valve body 1.
  • FIG. 3 shows an enlarged representation 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 a shape that is optimized for the inlet of the fuel.
  • the shape of the cross section - starting from the inlet opening 20 - increasingly approaches the circle over the length of the injection channel 7, so that the outlet opening 22 is circular. In this way, the overall cross section of the injection channel is reduced over the length, which accelerates the flow of fuel in the injection channel 7.
  • FIG. 4 again shows the inlet opening 20 of an injection channel 7 in an enlarged representation.
  • opening 20 has a circular basic shape 27 which has a center 28 and a radius R.
  • a first bulge 30 is formed over a first angular range a-_ of the circular basic shape 27, which in the illustration shown here has approximately a parabolic shape.
  • the bulge 30 has a point of greatest distance 130, the distance from the center 28 in FIG. 4 being designated A.
  • the angular range a ⁇ _ is smaller than 180 °
  • the connecting line 35 which connects the point greatest distance 130 with the center 28, includes an angle b with a mirror plane 33, which is smaller than 180 °.
  • the mirror plane 33 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 a2, a second bulge 39 which is mirror-symmetrical to the first bulge 30 with respect to the mirror plane 33.
  • the second bulge 31 also has a point at greatest distance 131, the line connecting it with the center point 28 and the mirror plane 33 also includes the angle b.
  • the bulges 30, 31 run as channel-like recesses on the wall of the injection channel 7 symmetrically on both sides.
  • the depth of the bulges 30, 31 can change or also remain constant over the entire length of the injection channel 7.
  • FIGS. 5A to 5E show cross sections through an exemplary embodiment of an injection channel 7, the cross sections in their position being at levels A, B, C, D and E. correspond to Figure 2.
  • FIG. 5A which shows the shape of the injection channel 7 in the sectional plane A, that is to say the inlet opening 20, the bulges 30, 31 are still clearly pronounced.
  • FIG. 5B and FIG. 5C these bulges 30, 31 have already been significantly reduced, and in the sectional plane D and E, which are shown in FIGS. 5D and 5E, the bulges 30, 31 have disappeared.
  • This results in an injection channel 7 which has an inlet opening 20 with the clearly formed bulges 30, 31 and which in its course merges into a circular shape up to the outlet opening 22.
  • the inlet opening 20 of the injection channel 7 is oriented such 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 ° around 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 also lead to inflow conditions in the injection channel 7, which are advantageous and lead to improved spray formation and thus combustion to lead.
  • Basic shape continuously reduced from the inlet opening 20 to the outlet opening 22, so that, for example, a conically tapering basic shape results, on the walls of which the bulges 30, 31 are provided.

Abstract

The invention relates to a fuel injection valve comprising a valve body (1), inside of which a blind hole (3) is formed that can be filled with fuel and at whose bottom a valve seat (11) is formed, whereby at least one injection duct (7) departs from said bottom. The injection duct (7) comprises an inlet opening (20) and an outlet opening (22), and said injection duct (7) is provided with an essentially cylindrical shape. The injection duct (7) has two bulges (30; 31), which form two duct-like recesses and which optimize the inflow of fuel into the injection duct (7).

Description

Kraftstoffeinspritzventil für BrennkraftmaschinenFuel injection valve for internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht von einem Kraftstoffeinspritzventil aus, wie es dem Oberbegriff des Anspruchs 1 entspricht. Ein solches Kraftstoffeinspritzventil ist beispielsweise aus der Schrift JP 11-117833 bekannt und weist einen Ventilkörper auf, in dem eine Sackbohrung ausgebildet ist. Am Grund der Sackbohrung ist ein Ventilsitz ausgebildet, mit dem eine in der Sackbohrung angeordnete Ventilnadel zusammenwirkt. Am Grund der Sackbohrung ist darüber hinaus wenigstens ein Einspritzkanal ausgebildet, der den durch die Sackbohrung gebildeten Innenraum mit dem Brennraum der Brennkraftmaschine verbindet und der eine Eintrittsöffnung und eine Austrittsöffnung aufweist. Durch diesen Einspritzkanal wird, gesteuert durch die Ventilnadel, die mit dem Ventilsitz zusammenwirkt, Kraftstoff aus der Sackbohrung in den Brennraum der Brennkraftmaschine eingespritzt.The invention is based on a fuel injection valve as it corresponds to the preamble of claim 1. Such a fuel injection valve is known, for example, from JP 11-117833 and has a valve body in which a blind bore is formed. A valve seat is formed at the bottom of the blind bore, with which a valve needle arranged in the blind bore interacts. At the bottom of the blind bore, at least one injection channel is also formed, which connects the interior formed by the blind bore to the combustion chamber of the internal combustion engine and which has an inlet opening and an outlet opening. Controlled by the valve needle, which interacts with the valve seat, fuel is injected from the blind bore into the combustion chamber of the internal combustion engine through this injection channel.
Der Einspritzkanal ist meist im wesentlichen zylindrisch ausgebildet, wobei insbesondere die Eintrittsöffnung modifiziert werden kann. Aus der Schrift JP 11-117833 sind aber auch andere Formen bekannt, bei denen der Einspritzkanal ei- ne Sternform, Kreuzform, Keulenform oder Rechteckform aufweist. Die Querschnittsform des Einspritzkanals wirkt sich auf die Einspritzcharakteristik des Kraftstoffeinspritzventils aus und kann - je nach Typ des Kraftstoffeinspritzven- tils - zu einer Verbesserung des Verbrennungsvorgangs füh- ren. Allen dort gezeigten Formen ist jedoch gemein, dass sie die Einströmverhältnisse vom Ventilsitz in den Einspritzkanal hinein nicht ausreichend berücksichtigen. Der in den Einspritzkanal einströmende Kraftstoff wird in ein Strömungsprofil, das durch den Querschnitt des Einspritzkanals bestimmt wird, gezwungen, das nicht dem Einströmungsprofil des Kraftstoffs in das Spritzloch entspricht, so dass folglich Druckverluste im Einspritzkanal auftreten, die die Spraybildung des Kraftstoffs bei der Einspritzung in den Brennraum beeinträchtigen können.The injection channel is usually essentially cylindrical, in particular the inlet opening can be modified. From JP 11-117833, however, other shapes 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 can - depending on the type of fuel injection valve - lead to an improvement in the combustion process. However, all the shapes shown there have in common that they influence the inflow conditions from the valve seat into the injection channel not considered sufficiently. The one in 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 spray hole, so that pressure losses occur in the injection channel, which impair the spray formation of the fuel when it is injected into the combustion chamber can.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Kraftstoffeinspritzventil mit den kennzeichnenden Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass der Eintrittsquerschnitt des Einspritzkanals so beschaffen ist, dass ein verlustarmes Ein- leiten des Kraftstoffs aus der Sackbohrung in den Einspritzkanal möglich ist, was den umsetzbaren Einspritzdruck und die Zerstäubung des Kraftstoffs beim Einspritzvorgang positiv beeinflusst. Hierzu weist die Eintrittsöffnungen im Querschnitt gesehen eine kreisrunde Grundform mit einem Ra- dius auf, wobei über einem ersten Winkelbereich des Umfangs der kreisförmigen Grundform eine erste Ausbuchtung gebildet ist, deren Winkelbereich weniger als 180° beträgt. Darüber hinaus ist in der kreisrunden Grundform eine zweite Ausbuchtung vorgesehen, die spiegelsymmetrisch zur ersten Ausbuch- tung ausgebildet ist, wobei die Spiegelebene durch den Mittelpunkt der kreisrunden Grundform geht. Beide Ausbuchtungen sind so zueinander angeordnet, dass die beiden Verbindungslinien der fernsten Punkte der Ausnehmungen mit dem Mittelpunkt einen Winkel mit der Spiegelebene von weniger als 180° einschließen. Aufgrund von Strömungsversuchen konnte gezeigt werden, dass derartige Ausnehmungen die Einströmungen des Kraftstoffs optimal unterstützen und zu einer Maximierung der Geschwindigkeit und damit zu einer Verbesserung der Ein- spritzbedingungen führen. Durch die ünteransprüche sind vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung möglich. Durch die Ausgestaltung der Eintrittsöffnung als Kreisform außerhalb der ersten und zweiten Ausbuchtung lässt sich bei der Fertigung der Einspritzkanal zuerst als Bohrung mit kreisrundem Querschnitt ausbilden, in die anschließend die Ausbuchtungen eingebracht werden. Besonders vorteilhaft ist es darüber hinaus, wenn die Ausbuchtungen ausgehend von der Eintrittsöffnung zur Austrittsöffnung sich stetig verkleinern, so dass die Austrittsöffnung zumindest näherungsweise einer Kreisform entspricht. Dadurch vermindert sich der Durchgangsquerschnitt des Einspritzkanals in seiner Längserstreckung, was zu einer Beschleunigung des Kraftstoffs im Einspritzkanal führt. Zusätzlich kann es vorgesehen sein, dass die Bohrung ihren kreisrunden Querschnitt von der Eintrittsöffnung zur Austrittsöffnung vermindert, also eine konische Form aufweist, was eine weitere Beschleunigung des KraftstoffStroms ergibt.The fuel injection valve according to the invention with the characterizing features of patent claim 1 has the advantage over the prior art that the inlet cross section of the injection channel is designed in such a way that the fuel can be introduced from the blind bore into the injection channel with little loss, which increases the convertible injection pressure and the atomization of the Fuel positively influenced during the injection process. For this purpose, the inlet openings, viewed in cross section, have a circular basic shape with a radius, a first bulge being formed over a first angular area of the circumference of the circular basic shape, the angular area of which is less than 180 °. In addition, a second bulge is provided in the circular basic shape, which is mirror-symmetrical to the first bulge, the mirror plane passing through the center of the circular basic shape. Both bulges are arranged 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 °. Based on flow tests, it could be shown that such recesses optimally support the inflows of the fuel and lead to a maximization of the speed and thus an improvement in the injection conditions. Advantageous refinements of the subject matter of the invention are possible through the subclaims. By designing the inlet opening as a circular shape outside the first and second bulges, the injection channel can first be formed as a bore with a circular cross section during manufacture, into which the bulges are subsequently introduced. It is also particularly advantageous if the bulges decrease continuously from the inlet opening to the outlet opening, so that the outlet opening corresponds at least approximately to a circular shape. As a result, the passage cross section of the injection channel is reduced in its longitudinal extent, which leads to an acceleration of the fuel in the injection channel. In addition, it can be provided that the bore reduces its circular cross section from the inlet opening to the outlet opening, that is to say it has a conical shape, which results in a further acceleration of the fuel flow.
Die Orientierung der Spiegelebene zwischen den beiden Ausbuchtungen ist in vorteilhafter Weise in einer gemeinsamen Ebene mit der Längsachse der Sackbohrung orientiert, so dass bezüglich der Spiegelebene ein symmetrisches Einströmen eines Kraftstoffs in den Einspritzkanal erfolgt.The orientation of the mirror plane between the two bulges is advantageously oriented in a common plane with the longitudinal axis of the blind bore, so that a fuel flows symmetrically into the injection channel with respect to the mirror plane.
Zeichnungdrawing
In der Zeichnung ist ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils dargestellt. Es zeigt Figur 1 einen Längsschnitt durch ein erfindungsgemäßes Kraftstoffeinspritzventil, Figur 2 eine Vergrößerung von Figur 1 im Bereich des Sacklochs, Figur 3 eine vergrößerte Darstellung der Innenwand des Sacklochs mit einem Einspritzkanal, Figur 4 die Eintrittsöffnung des Einspritzkanals und Figur 5A bisIn the drawing, an embodiment of the fuel injection valve according to the invention is shown. 1 shows a longitudinal section through a fuel injection valve according to the invention, FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole, FIG. 3 shows an enlarged view of the inner wall of the blind hole with an injection channel, Figure 4 shows the inlet opening of the injection channel and Figure 5A to
Figur 5E zeigen jeweils Querschnitte durch den Einspritzkanal in äquidistanten Abständen, wie sie in Fi- gur 2 eingezeichnet sind.FIG. 5E each show cross sections through the injection channel at equidistant intervals, as shown in FIG. 2.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In Figur 1 ist ein erfindungsgemäßes Kraftstoffeinspritzven- til im Längsschnitt dargestellt. In einem Ventilkörper 1 ist eine Sackbohrung 3 ausgebildet, die eine Längsachse 8 aufweist und an deren Grund ein im wesentlichen konischer Ventilsitz 11 ausgebildet ist. An den Ventilsitz 11 schließt sich eine Sackbohrung 9 an, von der mehrere Einspritzkanäle 7 ausgehen. Die Einspritzkanäle 7 münden in Einbaulage des Kraftstoffeinspritzventils in den Brennraum der Brennkraftmaschine. In der Sackbohrung 3 ist eine kolbenförmige Ventilnadel 5 längsverschiebbar angeordnet, die in einem geführten Abschnitt 15 in der Sackbohrung 3 geführt ist. Aus- gehend vom geführten Abschnitt 15 verjüngt sich die Ventilnadel 5 unter Bildung einer Druckschulter 13 und geht an ihrem ventilsitzseitigen Ende in eine im wesentlichen konische Ventildichtfläche 17 über, die mit dem Ventilsitz 11 zusammenwirkt. Auf Höhe der Druckschulter 13 ist die Sackbohrung 3 radial erweitert und bildet so einen Druckraum 19, der sich als Ringkanal zwischen der Ventilnadel 5 und der Sackbohrung 3 bis zum Ventilsitz 11 fortsetzt. In die radiale Erweiterung des Druckraums 19 mündet ein im Ventilkörper 1 verlaufender Zulaufkanal 25, über den der Druckraum 19 mit Kraftstoff befüllt werden kann. Die Ventilnadel 5 wird von einer nicht dargestellten Vorrichtung mit einer Schließkraft in Richtung des Ventilsitzes 11 beaufschlagt, so dass sich über das Zusammenspiel der hydraulischen Kräfte auf die Druckschulter 13 und der Schließkraft eine Längsbewegung der Ventilnadel 5 in der Sackbohrung 3 erreichen lässt. Liegt die Ventilnadel 5 auf dem Ventilsitz 11 auf, so wird der Druckraum 19 abgedichtet. Hebt die Ventilnadel 5 hingegen vom Ventilsitz ab, so strömt Kraftstoff aus dem Druckraum 19 in das Sackloch 9 und wird von dort durch die Einspritzkanä- le 7 in den Brennraum eingespritzt.A fuel injection valve according to the invention is shown in longitudinal section in FIG. A blind bore 3 is formed in a valve body 1, which has a longitudinal axis 8 and at the bottom of which a substantially conical valve seat 11 is formed. A blind bore 9 adjoins the valve seat 11, from which a plurality of injection channels 7 extend. The injection channels 7 open into the combustion chamber of the internal combustion engine in the installed position of the fuel injection valve. In the blind bore 3, a piston-shaped valve needle 5 is arranged to be longitudinally displaceable, which is guided in a guided section 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 end on the valve seat side into an essentially conical valve sealing surface 17 which cooperates with the valve seat 11. At the level of the pressure shoulder 13, the blind bore 3 is expanded radially and thus forms a pressure chamber 19 which continues as an annular channel between the valve needle 5 and the blind bore 3 up to the valve seat 11. In the radial expansion of the pressure chamber 19, an inlet channel 25 runs in the valve body 1, 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 interaction of the hydraulic forces on the pressure shoulder 13 and the closing force. Lies the valve needle 5 on the valve seat 11, the pressure chamber 19 is sealed. However, if the valve needle 5 lifts 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.
Figur 2 zeigt eine Vergrößerung von Figur 1 im Bereich des Sacklochs, wobei dieser Bereich in Figur 1 mit II gekennzeichnet ist. Die Einspritzkanäle 7, die vom Sackloch ausge- hen, weisen eine im wesentlichen zylindrische Form auf. Die Eintrittsöffnung 20 der Einspritzkanäle 7 ist im Sackloch 9 angeordnet und die Austrittsöffnung 22, aus der der Kraftstoff austritt und in den Brennraum eingespritzt wird, an der Außenwand des Ventilkörpers 1. Für den Einspritzkanal 7, der am rechten Rand der Figur 2 dargestellt ist, sind fünf Schnittebenen A, B, C, D und E eingezeichnet, die äquidis- tant zueinander sind, wobei die Schnittebene A der Eintrittsöffnung 20 und die Schnittebene E der Austrittsöffnung 22 entspricht. Auf diese Schnittebenen wird später noch nä- her eingegangen.FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole, this area being identified by II in FIG. 1. The injection channels 7, which start from the blind hole, have an essentially 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 emerges and is injected into the combustion chamber, on the outer wall of the valve body 1. For the injection channel 7, which is shown on the right-hand edge of FIG. five sectional planes A, B, C, D and E are drawn in, which are equidistant from one another, the sectional plane A corresponding to the inlet opening 20 and the sectional plane E corresponding to the outlet opening 22. These cutting planes will be discussed in more detail later.
Figur 3 zeigt eine vergrößerte Darstellung der Innenwand des Sacklochs 9 mit einem Einspritzkanal 7. Die Eintrittsöffnung 20 des Einspritzkanals 7 ist nicht kreisrund ausgebildet, sondern weist eine für den Einlauf des Kraftstoffs optimierte Form auf. Über die Länge des Einspritzkanals 7 nähert sich die Form des Querschnitts - ausgehend von der Eintrittsöffnung 20 - immer mehr dem Kreis an, so dass die Austrittsöffnung 22 kreisrund ist. Auf diese Weise wird der Ge- samtquerschnitt des Einspitzkanals über die Länge verringert, was die Strömung des Kraftstoffs im Einspritzkanal 7 beschleunigt.FIG. 3 shows an enlarged representation 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 a shape that is optimized for the inlet of the fuel. The shape of the cross section - starting from the inlet opening 20 - increasingly approaches the circle over the length of the injection channel 7, so that the outlet opening 22 is circular. In this way, the overall cross section of the injection channel is reduced over the length, which accelerates the flow of fuel in the injection channel 7.
Figur 4 zeigt nochmals die Eintrittsöffnung 20 eines Ein- spritzkanals 7 in vergrößerter Darstellung. Die Eintritts- Öffnung 20 weist im Querschnitt eine kreisrunde Grundform 27 auf, die einen Mittelpunkt 28 und einen Radius R aufweist. Über einen ersten Winkelbereich a-_ der kreisförmigen Grundform 27 ist eine erste Ausbuchtung 30 ausgebildet, die in der hier gezeigten Darstellung näherungsweise eine Parabelform aufweist. Die Ausbuchtung 30 weist einen Punkt größten Abstands 130 auf, dessen Abstand vom Mittelpunkt 28 in der Figur 4 mit A bezeichnet ist. Der Winkelbereich a^_ ist hierbei kleiner als 180°, und die Verbindungslinie 35, die den Punkt größten Abstand 130 mit dem Mittelpunkt 28 verbindet, schließt mit einer Spiegelebene 33 einen Winkel b ein, der kleiner als 180° ist. Die Spiegelebene 33 verläuft hierbei durch den Mittelpunkt 28 und ist vorzugsweise in derselben Ebene wie die Längsachse 8 der Sackbohrung 3 angeordnet. Die kreisrunde Grundform 27 weist über einem zweiten Winkelbereich a2 eine zweite Ausbuchtung 39 auf, die bezüglich der Spiegelebene 33 spiegelsymmetrisch zur ersten Ausbuchtung 30 ausgebildet ist. Auch die zweite Ausbuchtung 31 weist einen Punkt größten Abstand 131 auf, dessen Verbindungslinie mit dem Mittelpunkt 28 mit der Spiegelebene 33 ebenfalls den Winkel b einschließt.FIG. 4 again shows the inlet opening 20 of an injection channel 7 in an enlarged representation. The entry In cross section, opening 20 has a circular basic shape 27 which has a center 28 and a radius R. A first bulge 30 is formed over a first angular range a-_ of the circular basic shape 27, which in the illustration shown here has approximately a parabolic shape. The bulge 30 has a point of greatest distance 130, the distance from the center 28 in FIG. 4 being designated A. The angular range a ^ _ is smaller than 180 °, and the connecting line 35, which connects the point greatest distance 130 with the center 28, includes an angle b with a mirror plane 33, which is smaller than 180 °. The mirror plane 33 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 a2, a second bulge 39 which is mirror-symmetrical to the first bulge 30 with respect to the mirror plane 33. The second bulge 31 also has a point at greatest distance 131, the line connecting it with the center point 28 and the mirror plane 33 also includes the angle b.
Die Ausbuchtungen 30, 31 verlaufen als kanalartige Ausnehmungen an der Wand des Einspritzkanals 7 symmetrisch auf beiden Seiten. Hierbei kann sich die Tiefe der Ausbuchtungen 30, 31 ändern oder auch über die gesamte Länge des Ein- spritzkanals 7 konstant bleiben. Es hat sich aber als vorteilhaft erwiesen, wenn sich die Tiefe der Ausbuchtungen 30, 31 über die Länge des Einspritzkanals 7 verkleinert, also der Abstand A der Punkte größten Abstands 130 bzw. 131 zum Mittelpunkt 28 kleiner werden.The bulges 30, 31 run as channel-like recesses on the wall of the injection channel 7 symmetrically on both sides. Here, the depth of the bulges 30, 31 can change or also remain constant over the entire length of the injection channel 7. However, it has proven to be advantageous if the depth of the bulges 30, 31 is reduced over the length of the injection channel 7, that is to say the distance A between the points with the greatest distance 130 and 131 from the center 28 becomes smaller.
In Figur 5A bis 5E sind Querschnitte durch ein Ausführungsbeispiel eines Einspritzkanals 7 dargestellt, wobei die Querschnitte in ihrer Position den Ebenen A, B, C, D und E der Figur 2 entsprechen. In Figur 5A, die die Form des Einspritzkanals 7 in der Schnittebene A, also die Eintrittsöffnung 20 darstellt, sind die Ausbuchtungen 30, 31 noch deutlich ausgeprägt. In Figur 5B und Figur 5C sind diese Aus- buchtungen 30, 31 bereits deutlich vermindert, und in der Schnittebene D und E, die in den Figuren 5D und 5E dargestellt sind, sind die Ausbuchtungen 30, 31 verschwunden. Somit ergibt sich ein Einspritzkanal 7, der eine Eintrittsöffnung 20 mit den deutlich ausgebildeten Ausbuchtungen 30, 31 aufweist und der in seinem Verlauf bis zur Austrittsöffnung 22 in eine kreisrunde Form übergeht.FIGS. 5A to 5E show cross sections through an exemplary embodiment of an injection channel 7, the cross sections in their position being at levels A, B, C, D and E. correspond to Figure 2. In FIG. 5A, which shows the shape of the injection channel 7 in the sectional plane A, that is to say the inlet opening 20, the bulges 30, 31 are still clearly pronounced. In FIG. 5B and FIG. 5C, these bulges 30, 31 have already been significantly reduced, and in the sectional plane D and E, which are shown in FIGS. 5D and 5E, the bulges 30, 31 have disappeared. This results in an injection channel 7 which has an inlet opening 20 with the clearly formed bulges 30, 31 and which in its course merges into a circular shape up to the outlet opening 22.
Die Eintrittsöffnung 20 des Einspritzkanals 7 ist in dem o- ben beschriebenen Ausführungsbeispiel so orientiert, dass die Ausbuchtungen 30, 31 in Richtung des offenen Endes der Sackbohrung 3 weisen. Es kann jedoch auch vorgesehen sein, dass die Eintrittsöffnung 20 um 180° um den Mittelpunkt 28 gedreht angeordnet ist, so dass die Ausbuchtungen 30, 31 kanalartige Ausnehmungen an der Seite des Einspritzkanals 7 bilden, die von der Ventilnadel 5 weggerichtet ist. Je nach Strömungsbedingungen im Sackloch 9, die von dessen Form und Volumen abhängen, und der Ausgestaltung der Ventilnadel 5 kann auch diese Orientierung der Ausbuchtungen 30, 31 zu Einströmbedingungen im Einspritzkanal 7 führen, die vorteil- haft sind und zu einer verbesserten Spraybildung und damit Verbrennung führen.In the exemplary embodiment described above, the inlet opening 20 of the injection channel 7 is oriented such that the bulges 30, 31 point in the direction of the open end of the blind bore 3. However, it can also be provided that the inlet opening 20 is arranged rotated by 180 ° around 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. Depending on the flow conditions in the blind hole 9, which depend on its shape and volume, and the configuration of the valve needle 5, this orientation of the bulges 30, 31 can also lead to inflow conditions in the injection channel 7, which are advantageous and lead to improved spray formation and thus combustion to lead.
Es kann auch vorgesehen sein, dass statt einer kreisrunden Grundform, deren Durchmesser über die gesamte Länge des Ein- spritzkanals 7 konstant bleibt, sich der Durchmesser derIt can also be provided that instead of a circular basic shape, the diameter of which remains constant over the entire length of the injection channel 7, the diameter of the
Grundform von der Eintrittsöffnung 20 zur Austrittsöffnung 22 kontinuierlich vermindert, so dass sich beispielsweise eine konisch zulaufende Grundform ergibt, an deren Wänden die Ausbuchtungen 30, 31 vorgesehen sind. Basic shape continuously reduced from the inlet opening 20 to the outlet opening 22, so that, for example, a conically tapering basic shape results, on the walls of which the bulges 30, 31 are provided.

Claims

Ansprüche Expectations
1. Kraftstoffeinspritzventil für Brennkraftmaschinen mit einem Ventilkörper (1) , in dem eine Sackbohrung (3) ausge- bildet ist, die mit Kraftstoff befullbar ist und an deren Grund ein Ventilsitz (11) ausgebildet ist und von welchem Grund wenigstens ein Einspritzkanal (7) ausgeht, der eine Eintrittsöffnung (20) und eine Austrittsöffnung (22) aufweist, dadurch gekennzeichnet, dass die Eintrittsöffnung (20) im Querschnitt betrachtet eine kreisrunde Grundform mit einem Radius (R) und einem Mittelpunkt (28) aufweist und über einem ersten Winkelbereich (a]_) des Umfangs der kreisrunden Grundform eine erste Ausbuchtung (30) aus- gebildet ist, wobei der erste Winkelbereich (a^_) weniger als 180° beträgt und die erste Ausbuchtung (30) so beschaffen ist, dass der Wandbereich der Ausbuchtung (30) einen Punkt größten Abstands (130) vom Mittelpunkt (28) aufweist, - und mit einer zweiten Ausbuchtung (31) , die spiegelsymmetrisch zur ersten Ausbuchtung (30) über einem zweiten Winkelbereich (β2) ausgebildet ist, wobei die Spiegelebene (33) durch den Mittelpunkt (28) der kreisförmigen Grundform geht, und wobei die beiden Ausbuchtungen (30; 31) so zueinander angeordnet sind, dass die beiden Verbindungslinien (35, 36) der Punkte größten Abstands (130; 131) mit dem Mittelpunkt (28) jeweils einen Winkel (b) mit der Spiegelebene (33) von weniger als 180° einschließen. 1. Fuel injection valve for internal combustion engines with a valve body (1) in which a blind bore (3) is formed, which can be filled with fuel and on the bottom of which a valve seat (11) is formed and for which reason at least one injection channel (7) which has an inlet opening (20) and an outlet opening (22), characterized in that the inlet opening (20), viewed in cross section, has a circular basic shape with a radius (R) and a center point (28) and over a first angular range ( a] _) of the circumference of the circular basic shape, a first bulge (30) is formed, the first angular range (a ^ _) being less than 180 ° and the first bulge (30) being such that the wall region of the bulge (30) has a point of greatest distance (130) from the center (28), - and with a second bulge (31) which is mirror-symmetrical to the first bulge (30) over a second angular range h (β2), the mirror plane (33) passing through the center point (28) of the circular basic shape, and the two bulges (30; 31) are arranged in such a way that the two connecting lines (35, 36) of the points of greatest distance (130; 131) with the center point (28) each form an angle (b) with the mirror plane (33) of less than 180 °.
2. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Umfang der Eintrittsöffnung (20) außerhalb der ersten Ausbuchtung (30) und zweiten Ausbuchtung (31) eine Kreisform aufweist.2. Fuel injection valve according to claim 1, characterized in that the circumference of the inlet opening (20) outside the first bulge (30) and second bulge (31) has a circular shape.
3. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass sich der Abstand der Punkte größten Abstands (130; 131) der Ausbuchtungen (30; 31) in Längsrichtung des Einspritzkanals (7) stetig verringert.3. Fuel injection valve according to claim 1, characterized in that the distance between the points of greatest distance (130; 131) of the bulges (30; 31) in the longitudinal direction of the injection channel (7) decreases continuously.
4. Kraftstoffeinspritzventil nach Anspruch 3, dadurch ge- kennzeichnet, dass sich der Abstand der Punkte größten Abstands (130, 131) vom Mittelpunkt (28) von der Eintrittsöffnung (20) bis zur Austrittsöffnung (22) bis auf den Radius (R) der kreisförmigen Grundform verringert, so dass die Austrittsöffnung (22) kreisförmig ausgebildet ist.4. Fuel injection valve according to claim 3, character- ized in that the distance of the points greatest distance (130, 131) from the center (28) from the inlet opening (20) to the outlet opening (22) to the radius (R) circular basic shape reduced, so that the outlet opening (22) is circular.
5. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass sich der Radius (R) der kreisrunden Grundform von der Eintrittsöffnung (20) zur Austrittsöffnung (22) stetig verringert.5. Fuel injection valve according to claim 1, characterized in that the radius (R) of the circular basic shape from the inlet opening (20) to the outlet opening (22) is continuously reduced.
6. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass die Spiegelebene (33) in einer gemeinsamen Ebene mit der Längsachse (8) der Sackbohrung (3) liegt.6. Fuel injection valve according to claim 1, characterized in that the mirror plane (33) lies in a common plane with the longitudinal axis (8) of the blind bore (3).
7. Kraftstoffeinspritzventil nach Anspruch 6, dadurch ge- kennzeichnet, dass die Ausbuchtungen (30; 31) zum offenen Ende der Sackbohrung (3) hin ausgerichtet sind.7. Fuel injection valve according to claim 6, characterized in that the bulges (30; 31) are aligned towards the open end of the blind bore (3).
8. Kraftstoffeinspritzventil nach Anspruch 6, dadurch gekennzeichnet, dass die Ausbuchtungen (30; 31) zum ge- schlossenen Ende der Sackbohrung (3) hin ausgerichtet sind.8. Fuel injection valve according to claim 6, characterized in that the bulges (30; 31) for the closed end of the blind bore (3) are aligned.
9. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Übergang der Ausbuchtungen (30; 31) zur kreisförmigen Grundform gerundet ist.9. Fuel injection valve according to claim 1, characterized in that the transition of the bulges (30; 31) is rounded to the circular basic shape.
10. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass die Einlaufkante an der Eintrittsöffnung (20) des Einspritzkanals (7) verrundet ist. 10. Fuel injection valve according to claim 1, characterized in that the inlet edge at the inlet opening (20) of the injection channel (7) is rounded.
PCT/DE2004/000932 2003-07-04 2004-05-03 Fuel injection valve for combustion engines WO2005010350A1 (en)

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EP04730825.9A EP1644636B2 (en) 2003-07-04 2004-05-03 Fuel injection valve for combustion engines
DE502004003489T DE502004003489D1 (en) 2003-07-04 2004-05-03 FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

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DE2003130256 DE10330256A1 (en) 2003-07-04 2003-07-04 Fuel injection valve for internal combustion engine, comprises bulges arranged such that the two connecting lines of points of largest distance to the center form an angle of less than 180 degrees with the mirror plane
DE10330256.5 2003-07-04

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DE102008051365B4 (en) 2008-10-15 2010-07-01 L'orange Gmbh Fuel injection valve for internal combustion engines
DE102011007885A1 (en) * 2011-04-21 2012-10-25 Continental Automotive Gmbh Nozzle assembly for an injection valve and injection valve
EP2808533B1 (en) * 2013-05-29 2019-08-14 Delphi Technologies IP Limited Fuel injector

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JPH0326096A (en) * 1989-06-22 1991-02-04 Fujitsu Ltd Cpu resetting system for controller to be supervised
DE19726099A1 (en) * 1996-06-21 1998-01-08 Zexel Corp Fuel injection nozzle
DE19815918A1 (en) * 1998-04-09 1999-10-21 Man B & W Diesel As Fuel injector
DE19914719A1 (en) * 1999-03-31 2000-10-05 Siemens Ag Hydro-erosive bore edge rounding method
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EP1644636B1 (en) 2007-04-11
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EP1644636A1 (en) 2006-04-12
DE10330256A1 (en) 2005-01-20

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