EP1346143B1 - Fuel injection valve for internal combustion engines - Google Patents

Fuel injection valve for internal combustion engines Download PDF

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Publication number
EP1346143B1
EP1346143B1 EP01270695A EP01270695A EP1346143B1 EP 1346143 B1 EP1346143 B1 EP 1346143B1 EP 01270695 A EP01270695 A EP 01270695A EP 01270695 A EP01270695 A EP 01270695A EP 1346143 B1 EP1346143 B1 EP 1346143B1
Authority
EP
European Patent Office
Prior art keywords
valve member
bore
throttle
annular collar
fuel injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01270695A
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German (de)
French (fr)
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EP1346143A1 (en
Inventor
Detlev Potz
Friedrich Moser
Thomas Kuegler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1346143A1 publication Critical patent/EP1346143A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042The valves being provided with fuel passages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines, preferably self-igniting internal combustion engines, as known from DE 198 57 244 A1 is.
  • a valve body has a bore in which a piston-shaped valve member against a closing force is arranged to be longitudinally displaceable.
  • the valve member comes on its combustion chamber end into a valve sealing surface, which cooperates with a valve seat and so the opening controls at least one injection opening.
  • the valve member is in the bore in a combustion chamber facing away from the combustion chamber Sealing section and in a combustion chamber facing guide section guided in the hole.
  • the guide section is divided into a ring collar facing away from the combustion chamber an annular groove formed on the side of the valve member Recesses is separated, so that fuel through this Recesses between the wall of the bore and the valve member can flow past.
  • the ring collar points to his end facing the combustion chamber on a control edge, which with a cooperates on the wall of the bore formed sealing edge.
  • the bore is a throttle bore trained so that fuel throttled from the pressure chamber to the recesses and thus to a second pressure chamber, the between the valve member and the wall of the bore between the guide section and the valve sealing surface is, can flow.
  • the closed state of the Fuel injection valve is the valve sealing surface of the Valve member on the valve seat and the control edge on the collar is located facing the sealing edge, see that only through the throttle bore a connection from the first to the second pressure chamber. If an injection is to take place, so fuel is under high pressure in the first Pressure chamber initiated and flows from there through the throttle bore also in the second pressure room.
  • valve sealing surface lifts from the valve seat and fuel is through the injection opening into the combustion chamber of the internal combustion engine injected.
  • the control edge on the valve element faces the combustion chamber is too little fuel through the throttle bore from the first to the second pressure chamber reach. If in the course of the opening stroke movement of the valve member the control edge passes the sealing edge, so the first pressure chamber via the ring groove and the recesses on Guide section of the valve member with the second pressure chamber connected and fuel can be almost unthrottled from first flow into the second pressure chamber.
  • the throttle duct is designed as a throttle bore, which is at least approximately parallel to the longitudinal axis of the Valve member runs in the collar.
  • a throttle bore can be advantageously by laser drilling produce what it is a non-contact process so that the throttle bore easily after completion of the whole Valve member can be introduced. It can also be provided that a plurality of such throttle bores distributed over the circumference of the ring collar is to ensure a steady flow of fuel from the first to ensure in the second pressure chamber.
  • the throttle bores are preferably arranged so that a of the recesses in the guide section of the valve member in the combustion chamber extension of the throttle bore, so that there is free access to the combustion chamber Front of the collar by one from the combustion chamber side Laser beam coming end of the valve member is given.
  • the fuel injector is the throttle connection by at least one bevel on the side Ring collar trained. These cuts can be extensive be carried out, which is easy to manufacture and a very precise setting of the cross-section of the throttle connection makes possible.
  • FIG. 1 is a fuel injection valve according to the invention shown in longitudinal section.
  • a valve body 1 In a valve body 1 is a bore 3 is formed, the end facing away from the combustion chamber of the valve body 1 is open and at the combustion chamber end passes into a substantially conical valve seat 13.
  • a piston-shaped Valve member 5 arranged longitudinally.
  • the valve member 5 is with a sealing portion 105 in one bore seal section 103 facing away from the combustion chamber Bore 3 sealingly guided and also with a guide section 205 in a combustion chamber-side bore guide section 203.
  • valve member 5 Goes to its combustion chamber end the valve member 5 in a valve sealing surface 15, which in is essentially conical and with the valve seat 13 cooperates so that the injection openings 17 in the system the valve sealing surface 15 is closed on the valve seat 13 and with the valve sealing surface lifted off the valve seat 13 15 are released.
  • a first Pressure chamber 9 is formed, the one in the valve body 1 extending inlet channel 7 with one in the drawing High-pressure fuel source, not shown, connectable is.
  • valve sealing surface 15 and valve seat 13 via the injection openings 17 is connectable to the combustion chamber.
  • Figure 2 shows an enlarged view of Figure 1 in Area of the bore guide section 203.
  • Figure 3 shows the corresponding cross section along the line III-III of Figure 1 and Figure 2.
  • the guide section 205 is in the bore guide section 203 led and has three areal Grindings 28 on, so that fuel on the guide section 205 past in the axial direction of the valve member 5 can flow.
  • Ahead of the combustion chamber adjoins the guide section 205 an annular groove 26 on and in turn a collar 22.
  • the collar 22 is in a radial plane
  • the valve member 5 is arranged and has a combustion chamber facing End face 37 and an end face facing away from the combustion chamber 36 on.
  • the bore guide section 203 is here in relation to the bore 3 Diameter slightly reduced, so that at the transition of the first Pressure chamber 9 to the bore guide section 203 an annular shoulder 30 is formed, which is delimited by a sealing edge 32 that is at the beginning of the bore guide section 203 is formed.
  • the collar 22 has a diameter which is only slightly smaller than the diameter of the Bore guide section 203 so that when closed Fuel injector has virtually no fuel from the first pressure chamber 9 past the collar 22 through the annular groove 26 and the recesses 28 flow into the second pressure chamber 19 can.
  • three throttle channels are arranged, which are designed as throttle bores 40 and which End face 36 of the collar 22 facing away from the combustion chamber with the Connect the end face 37 of the collar 22 facing the combustion chamber. It can also be provided, more or less to be arranged as three throttle channels.
  • the throttle bores 40 are arranged so that they are at least essentially run parallel to the longitudinal axis 6 of the valve member 5 and that in their extension on the combustion chamber side a bevel 28 is arranged.
  • valve member 5 is not by one in the drawing Applied device with a closing force, the valve member 5 with the valve sealing surface 15 presses against the valve seat 13. Since the valve member 5 from section leading to the combustion chamber in the sealing section 103 tapered towards, is a pressure shoulder 11 on the valve member 5 formed, which is arranged in the first pressure chamber 9. at a corresponding fuel pressure in the pressure chamber 9 results a hydraulic force on the pressure shoulder 11, the a component acting in the longitudinal direction of the valve member 5 has, which is opposite to the closing force. To this The valve member 5 can be pressure-controlled by the Pressure in the first pressure chamber 9 in the longitudinal direction against the Moving closing force and thus the injection openings 17 open and open heading.
  • the fuel injector works like follows: At the beginning of the injection, fuel becomes too high Pressure through the inlet channel 7 into the first pressure chamber 9 directed. From there, the fuel flows through the throttle bores 40 in the second pressure chamber 19, so that there too the fuel pressure increases. Reaches the fuel pressure in the first pressure chamber 9 a certain level, so by the hydraulic force on the pressure shoulder 11 opposes a force the closing force exerted on the valve member 5, the this moves away from the valve seat 13 in the axial direction. As a result, the valve sealing surface 15 lifts off the valve seat 13 and opens the injection openings 17.
  • FIG 4 shows a further embodiment of the invention Fuel injection valve and Figure 5 a Cross section through the fuel injector shown in Figure 4 along the line V-V.
  • the throttle channel between the first pressure chamber 9 and the second pressure chamber 19 is here through two throttle recesses 42 on the collar 22 trained as parallel grindings parallel to Longitudinal axis 6 of the valve member 5 are executed. It can also be provided that more than two throttle recesses 42 are formed on the collar 22. These are preferred evenly distributed over the circumference of the collar 22 arranged to provide a steady fuel flow to enable the second pressure chamber 19.
  • the Ring shoulder 30 bevelled, so that it with the Longitudinal axis 6 of the valve member 5 encloses an angle.

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

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffeinspritzventil für Brennkraftmaschinen aus, vorzugsweise selbstzündender Brennkraftmaschinen, wie es aus der Schrift DE 198 57 244 A1 bekannt ist. Ein Ventilkörper weist eine Bohrung auf, in der ein kolbenförmiges Ventilglied entgegen einer Schließkraft längsverschiebbar angeordnet ist. Das Ventilglied geht an seinem brennraumseitigen Ende in eine Ventildichtfläche über, die mit einem Ventilsitz zusammenwirkt und so die Öffnung wenigstens einer Einspritzöffnung steuert. Das Ventilglied ist in der Bohrung in einem brennraumabgewandten Dichtabschnitt und in einem brennraumzugewandten Führungsabschnitt in der Bohrung geführt. Der Führungsabschnitt unterteilt sich in einen brennraumabgewandten Ringbund, der durch eine Ringnut von am Ventilglied ausgebildeten seitlichen Ausnehmungen getrennt ist, so daß Kraftstoff durch diese Ausnehmungen zwischen der Wand der Bohrung und dem Ventilglied vorbeifließen kann. Der Ringbund weist an seinem brennraumzugewandten Ende eine Steuerkante auf, die mit einer an der Wand der Bohrung ausgebildeten Dichtkante zusammenwirkt. Darüber hinaus ist im Ventilglied eine Bohrung ausgebildet, die schräg zur Längsachse des Ventilglieds verläuft und den Druckraum, der brennraumabgewandt zum Ringbund. zwischen dem Ventilglied und der Wand der Bohrung ausgebildet ist, mit einer der Ausnehmungen am Führungsabschnitt des Ventilgliedes verbindet. Die Bohrung ist als Drosselbohrung ausgebildet, so daß Kraftstoff aus dem Druckraum gedrosselt zu den Ausnehmungen und damit zu einem zweiten Druckraum, der zwischen dem Ventilglied und der Wand der Bohrung zwischen dem Führungsabschnitt und der Ventildichtfläche ausgebildet ist, fließen kann. Im geschlossenen Zustand des Kraftstoffeinspritzventils liegt die Ventildichtfläche des Ventilglieds am Ventilsitz an und die Steuerkante am Ringbund ist brennraumzugewandt zur Dichtkante angeordnet, so daß nur über die Drosselbohrung eine Verbindung vom ersten zum zweiten Druckraum besteht. Soll eine Einspritzung erfolgen, so wird Kraftstoff unter hohem Druck in den ersten Druckraum eingeleitet und fließt von dort durch die Drosselbohrung auch in den zweiten Druckraum. Reicht die hydraulische Kraft auf das Ventilglied aus, dieses entgegen der Schließkraft vom Ventilsitz wegzubewegen, so hebt die Ventildichtfläche vom Ventilsitz ab und Kraftstoff wird durch die Einspritzöffnung in den Brennraum der Brennkraftmaschine eingespritzt. Solange die Steuerkante am Ventilglied brennraumzugewandt zur Dichtkante ist, kann nur wenig Kraftstoff durch die Drosselbohrung vom ersten in den zweiten Druckraum gelangen. Wenn im Zuge der Öffnungshubbewegung des Ventilglieds die Steuerkante die Dichtkante passiert, so wird der erste Druckraum über die Ringnut und die Ausnehmungen am Führungsabschnitt des Ventilgliedes mit dem zweiten Druckraum verbunden und Kraftstoff kann nahezu ungedrosselt vom ersten in den zweiten Druckraum fließen. Hierdurch erhöht sich der Druck im zweiten Druckraum und somit die Rate der Einspritzung, so daß insgesamt eine Einspritzverlaufsformung erreicht wird, bei der zu Beginn der Öffnungshubbewegung bedingt durch den relativ geringen Druck im zweiten Druckraum nur wenig Kraftstoff eingespritzt wird und die Hauptmenge des Kraftstoffs mit hohem Druck erst in der darauffolgenden Haupteinspritzung. Hierbei weist das bekannte Kraftstoffeinspritzventil jedoch den Nachteil auf, daß die notwendige Drosselbohrung aufwendig zu fertigen ist, was die Herstellung recht kostenintensiv macht. Weiterhin ergibt sich der Nachteil, daß die Drosselbohrung wegen der notwendigen Einspannungen des Ventilglieds bereits in einem frühen Stadium des Herstellungsprozesses eingebracht werden muß, was eine spätere Anpassung der Drosselbohrung an sonstige auftretende Toleranzen unmöglich macht.The invention relates to a fuel injection valve for Internal combustion engines, preferably self-igniting internal combustion engines, as known from DE 198 57 244 A1 is. A valve body has a bore in which a piston-shaped valve member against a closing force is arranged to be longitudinally displaceable. The valve member comes on its combustion chamber end into a valve sealing surface, which cooperates with a valve seat and so the opening controls at least one injection opening. The valve member is in the bore in a combustion chamber facing away from the combustion chamber Sealing section and in a combustion chamber facing guide section guided in the hole. The guide section is divided into a ring collar facing away from the combustion chamber an annular groove formed on the side of the valve member Recesses is separated, so that fuel through this Recesses between the wall of the bore and the valve member can flow past. The ring collar points to his end facing the combustion chamber on a control edge, which with a cooperates on the wall of the bore formed sealing edge. In addition, there is a hole in the valve member formed, which extends obliquely to the longitudinal axis of the valve member and the pressure chamber, which faces away from the combustion chamber to the collar. formed between the valve member and the wall of the bore is, with one of the recesses on the guide portion of the Valve member connects. The bore is a throttle bore trained so that fuel throttled from the pressure chamber to the recesses and thus to a second pressure chamber, the between the valve member and the wall of the bore between the guide section and the valve sealing surface is, can flow. In the closed state of the Fuel injection valve is the valve sealing surface of the Valve member on the valve seat and the control edge on the collar is located facing the sealing edge, see that only through the throttle bore a connection from the first to the second pressure chamber. If an injection is to take place, so fuel is under high pressure in the first Pressure chamber initiated and flows from there through the throttle bore also in the second pressure room. Reaches the hydraulic Force on the valve member, this against the To move the closing force away from the valve seat, the valve sealing surface lifts from the valve seat and fuel is through the injection opening into the combustion chamber of the internal combustion engine injected. As long as the control edge on the valve element faces the combustion chamber is too little fuel through the throttle bore from the first to the second pressure chamber reach. If in the course of the opening stroke movement of the valve member the control edge passes the sealing edge, so the first pressure chamber via the ring groove and the recesses on Guide section of the valve member with the second pressure chamber connected and fuel can be almost unthrottled from first flow into the second pressure chamber. This increases the pressure in the second pressure chamber and thus the rate of Injection, so that an overall injection course shaping is reached at the beginning of the opening stroke movement due to the relatively low pressure in the second pressure chamber little fuel is injected and the bulk the fuel with high pressure only in the following Main injection. Here, the known fuel injection valve However, the disadvantage is that the necessary Throttle bore is expensive to manufacture, what the manufacture quite expensive. Furthermore, the Disadvantage that the throttle bore because of the necessary clamps of the valve member at an early stage of the manufacturing process must be introduced, which is a later adjustment of the throttle bore to other occurring Makes tolerances impossible.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil mit den kennzeichnenden Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, daß der Drosselquerschnitt zwischen dem ersten Druckraum und dem zweiten Druckraum.durch einen Drosselkanal realisiert ist, der beide Stirnseiten des Ringbundes miteinander verbindet. Dieser Drosselkanal läßt sich nach Fertigstellung des gesamten Ventilglieds einbringen, so daß eine Anpassung an die sonstigen Toleranzen des Einspritzventils, z. B. die Größe des Ringspalts zwischen dem Ringbund und der Bohrung des Ventilkörpers möglich ist.The fuel injector according to the invention with the characteristic Features of claim 1, however, points have the advantage that the throttle cross section between the first pressure chamber and the second pressure chamber Throttle channel is realized, the two end faces of the collar connects with each other. This throttle channel can be insert after completion of the entire valve member, see above that an adaptation to the other tolerances of the injection valve, z. B. the size of the annular gap between the Ring collar and the bore of the valve body is possible.

In einer ersten vorteilhaften Ausgestaltung des Gegenstandes der Erfindung ist der Drosselkanal als Drosselbohrung ausgebildet, die zumindest annähernd parallel zur Längsachse des Ventilglieds im Ringbund verläuft. Eine solche Drosselbohrung läßt sich in vorteilhafter Weise durch Laserbohrung herstellen, was es ein berührungsloses Verfahren ist, so daß die Drosselbohrung problemlos nach Fertigstellung des gesamten Ventilglieds eingebracht werden kann. Dabei kann es auch vorgesehen sein, daß eine Vielzahl von solchen Drosselbohrungen über den Umfang des Ringbundes verteilt angeordnet ist, um einen gleichmäßigen Fluß des Kraftstoffs vom ersten in den zweiten Druckraum zu gewährleisten. Die Drosselbohrungen sind dabei vorzugsweise so angeordnet, daß sich eine der Ausnehmungen am Führungsabschnitt des Ventilglieds in der brennraumseitigen Verlängerung der Drosselbohrung befindet, so daß eine freie Zugänglichkeit der brennraumzugewandten Stirnseite des Ringbunds durch einen vom brennraumseitigen Ende des Ventilglieds kommenden Laserstrahl gegeben ist.In a first advantageous embodiment of the object According to the invention, the throttle duct is designed as a throttle bore, which is at least approximately parallel to the longitudinal axis of the Valve member runs in the collar. Such a throttle bore can be advantageously by laser drilling produce what it is a non-contact process so that the throttle bore easily after completion of the whole Valve member can be introduced. It can also be provided that a plurality of such throttle bores distributed over the circumference of the ring collar is to ensure a steady flow of fuel from the first to ensure in the second pressure chamber. The throttle bores are preferably arranged so that a of the recesses in the guide section of the valve member in the combustion chamber extension of the throttle bore, so that there is free access to the combustion chamber Front of the collar by one from the combustion chamber side Laser beam coming end of the valve member is given.

In einem weiteren vorteilhaften Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils ist die Drosselverbindung durch wenigstens einen seitlichen Anschliff am Ringbund ausgebildet. Diese Anschliffe können flächenhaft ausgeführt werden, was einfach herstellbar ist und eine sehr genaue Einstellung des Querschnitts der Drosselverbindung möglich macht.In a further advantageous embodiment of the invention The fuel injector is the throttle connection by at least one bevel on the side Ring collar trained. These cuts can be extensive be carried out, which is easy to manufacture and a very precise setting of the cross-section of the throttle connection makes possible.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Zeichnung, der Beschreibung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the object the invention are the drawing, the description and removable from the claims.

Zeichnungdrawing

In der Zeichnung sind verschiedene Ausführungsbeispiele des erfindungsgemäßen Kraftstoffeinspritzventils gezeigt. Es zeigt

  • Figur 1 einen Längsschnitt durch ein erfindungsgemäßes Kraftstoffeinspritzventil mit einem ungeschnittenen Ventilglied,
  • Figur 2 eine Vergrößerung von Figur 1 im Bereich des Führungsabschnitts des Ventilglieds,
  • Figur 3 einen Querschnitt entlang der Linie III-III der Figur 2,
  • Figur 4 denselben Ausschnitt wie Figur 2 eines anderen Ausführungsbeispiels und
  • Figur 5 einen Querschnitt entlang der Linie V-V der Figur 4.
Various exemplary embodiments of the fuel injection valve according to the invention are shown in the drawing. It shows
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention with an uncut valve member,
  • FIG. 2 shows an enlargement of FIG. 1 in the region of the guide section of the valve member,
  • 3 shows a cross section along the line III-III of FIG. 2,
  • Figure 4 shows the same detail as Figure 2 of another embodiment and
  • FIG. 5 shows a cross section along the line VV in FIG. 4.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ein erfindungsgemäßes Kraftstoffeinspritzventil im Längsschnitt dargestellt. In einem Ventilkörper 1 ist eine Bohrung 3 ausgebildet, die am brennraumabgewandten Ende des Ventilkörpers 1 offen ist und am brennraumseitigen Ende in einen im wesentlichen konischen Ventilsitz 13 übergeht. Am brennraumseitigen Ende der Bohrung 3 ist wenigstens eine Einspritzöffnung 17 ausgebildet, die die Bohrung 3 mit dem Brennraum der in der Zeichnung nicht dargestellten Brennkraftmaschine verbindet. In der Bohrung 3 ist ein kolbenförmiges Ventilglied 5 längsverschiebbar angeordnet. Das Ventilglied 5 wird mit einem Dichtungsabschnitt 105 in einem brennraumabgewandten Bohrungsdichtungsabschnitt 103 in der Bohrung 3 dichtend geführt und darüber hinaus mit einem Führungsabschnitt 205 in einem brennraumseitigen Bohrungsführungsabschnitt 203. An seinem brennraumseitigen Ende geht das Ventilglied 5 in eine Ventildichtfläche 15 über, die im wesentlichen konisch ausgebildet ist und mit dem Ventilsitz 13 zusammenwirkt, so daß die Einspritzöffnungen 17 bei Anlage der Ventildichtfläche 15 am Ventilsitz 13 verschlossen werden und bei vom Ventilsitz 13 abgehobener Ventildichtfläche 15 freigegeben werden. Zwischen dem Bohrungsdichtungsabschnitt 103 und dem Bohrungsführungsabschnitt 203 ist zwischen dem Ventilglied 5 und der Wand der Bohrung 3 ein erster Druckraum 9 ausgebildet, der über einen im Ventilkörper 1 verlaufenden Zulaufkanal 7 mit einer in der Zeichnung nicht dargestellten Kraftstoffhochdruckquelle verbindbar ist. Zwischen dem Bohrungsführungsabschnitt 203 und dem Ventilsitz 13 ist zwischen dem Ventilglied 5 und der Wand der Bohrung 3 durch eine radiale Erweiterung der Bohrung 3 ein zweiter Druckraum 19 ausgebildet, der über das Zusammenspiel von Ventildichtfläche 15 und Ventilsitz 13 über die Einspritzöffnungen 17 mit dem Brennraum verbindbar ist.In Figure 1 is a fuel injection valve according to the invention shown in longitudinal section. In a valve body 1 is a bore 3 is formed, the end facing away from the combustion chamber of the valve body 1 is open and at the combustion chamber end passes into a substantially conical valve seat 13. At the combustion chamber end of the bore 3 there is at least one Injection opening 17 formed, the bore 3 with the Combustion chamber of the internal combustion engine, not shown in the drawing combines. In the bore 3 is a piston-shaped Valve member 5 arranged longitudinally. The valve member 5 is with a sealing portion 105 in one bore seal section 103 facing away from the combustion chamber Bore 3 sealingly guided and also with a guide section 205 in a combustion chamber-side bore guide section 203. Goes to its combustion chamber end the valve member 5 in a valve sealing surface 15, which in is essentially conical and with the valve seat 13 cooperates so that the injection openings 17 in the system the valve sealing surface 15 is closed on the valve seat 13 and with the valve sealing surface lifted off the valve seat 13 15 are released. Between the bore sealing section 103 and the bore guide portion 203 is between the valve member 5 and the wall of the bore 3 a first Pressure chamber 9 is formed, the one in the valve body 1 extending inlet channel 7 with one in the drawing High-pressure fuel source, not shown, connectable is. Between the bore guide section 203 and the valve seat 13 is between the valve member 5 and the wall of the Hole 3 through a radial expansion of hole 3 second pressure chamber 19 is formed, the interaction of valve sealing surface 15 and valve seat 13 via the injection openings 17 is connectable to the combustion chamber.

Figur 2 zeigt eine vergrößerte Darstellung von Figur 1 im Bereich des Bohrungsführungsabschnitts 203. Figur 3 zeigt den entsprechenden Querschnitt entlang der Linie III-III der Figur 1 bzw. Figur 2. Der Führungsabschnitt 205 ist im Bohrungsführungsabschnitt 203 geführt und weist drei flächenhafte Anschliffe 28 auf, so daß Kraftstoff am Führungsabschnitt 205 vorbei in axialer Richtung des Ventilglieds 5 fließen kann. Brennraumabgewandt schließt sich an den Führungsabschnitt 205 eine Ringnut 26 an und an diese wiederum ein Ringbund 22. Der Ringbund 22 ist in einer Radialebene des Ventilglieds 5 angeordnet und weist eine brennraumzugewandte Stirnfläche 37 und eine brennraumabgewandte Stirnfläche 36 auf. Am Übergang des Ringbunds 22 zur Ringnut 26 ist am Ringbund 22 eine Steuerkante 34 ausgebildet, die in geschlossenem Zustand des Kraftstoffeinspritzventils, das ist, wenn die Ventildichtfläche 15 am Ventilsitz 13 anliegt, in den Bohrungsführungsabschnitt 203 eintaucht. Der Bohrungsführungsabschnitt 203 ist hierbei gegenüber der Bohrung 3 im Durchmesser etwas verringert, so daß am Übergang des ersten Druckraums 9 zum Bohrungsführungsabschnitt 203 eine Ringschulter 30 ausgebildet ist, die von einer Dichtkante 32 begrenzt wird, die am Beginn des Bohrungsführungsabschnitts 203 ausgebildet ist. Der Ringbund 22 weist einen Durchmesser auf, der nur geringfügig kleiner ist als der Durchmesser des Bohrungsführungsabschnitts 203, so daß bei geschlossenem Kraftstoffeinspritzventil praktisch kein Kraftstoff aus dem ersten Druckraum 9 am Ringbund 22 vorbei durch die Ringnut 26 und die Ausnehmungen 28 in den zweiten Druckraum 19 fließen kann. Im Ringbund 22 sind drei Drosselkanäle angeordnet, die als Drosselbohrungen 40 ausgebildet sind und die die brennraumabgewandte Stirnseite 36 des Ringbundes 22 mit der brennraumzugewandten Stirnseite 37 des Ringbundes 22 verbinden. Dabei kann es auch vorgesehen sein, mehr oder weniger als drei Drosselkanäle anzuordnen. Die Drosselbohrungen 40 sind dabei so angeordnet, daß sie zumindest im wesentlichen parallel zur Längsachse 6 des Ventilglieds 5 verlaufen und daß in ihrer brennraumseitigen Verlängerung jeweils ein Anschliff 28 angeordnet ist. Figure 2 shows an enlarged view of Figure 1 in Area of the bore guide section 203. Figure 3 shows the corresponding cross section along the line III-III of Figure 1 and Figure 2. The guide section 205 is in the bore guide section 203 led and has three areal Grindings 28 on, so that fuel on the guide section 205 past in the axial direction of the valve member 5 can flow. Ahead of the combustion chamber, adjoins the guide section 205 an annular groove 26 on and in turn a collar 22. The collar 22 is in a radial plane The valve member 5 is arranged and has a combustion chamber facing End face 37 and an end face facing away from the combustion chamber 36 on. At the transition from the collar 22 to the annular groove 26 on the collar 22 a control edge 34 formed in the closed State of the fuel injector that's if the valve sealing surface 15 abuts the valve seat 13, in dips the bore guide portion 203. The bore guide section 203 is here in relation to the bore 3 Diameter slightly reduced, so that at the transition of the first Pressure chamber 9 to the bore guide section 203 an annular shoulder 30 is formed, which is delimited by a sealing edge 32 that is at the beginning of the bore guide section 203 is formed. The collar 22 has a diameter which is only slightly smaller than the diameter of the Bore guide section 203 so that when closed Fuel injector has virtually no fuel from the first pressure chamber 9 past the collar 22 through the annular groove 26 and the recesses 28 flow into the second pressure chamber 19 can. In the collar 22, three throttle channels are arranged, which are designed as throttle bores 40 and which End face 36 of the collar 22 facing away from the combustion chamber with the Connect the end face 37 of the collar 22 facing the combustion chamber. It can also be provided, more or less to be arranged as three throttle channels. The throttle bores 40 are arranged so that they are at least essentially run parallel to the longitudinal axis 6 of the valve member 5 and that in their extension on the combustion chamber side a bevel 28 is arranged.

Das Ventilglied 5 wird durch eine in der Zeichnung nicht dargestellte Vorrichtung mit einer Schließkraft beaufschlagt, die das Ventilglied 5 mit der Ventildichtfläche 15 gegen den Ventilsitz 13 preßt. Da sich das Ventilglied 5 vom im Dichtungsabschnitt 103 geführten Abschnitt zum Brennraum hin verjüngt, ist am Ventilglied 5 eine Druckschulter 11 ausgebildet, die im ersten Druckraum 9 angeordnet ist. Bei einem entsprechenden Kraftstoffdruck im Druckraum 9 ergibt sich eine hydraulische Kraft auf die Druckschulter 11, die eine in Längsrichtung des Ventilglieds 5 wirkende Komponente hat, die der Schließkraft entgegengerichtet ist. Auf diese Weise läßt sich das Ventilglied 5 druckgesteuert durch den Druck im ersten Druckraum 9 in Längsrichtung entgegen der Schließkraft bewegen und so die Einspritzöffnungen 17 aufund zusteuern.The valve member 5 is not by one in the drawing Applied device with a closing force, the valve member 5 with the valve sealing surface 15 presses against the valve seat 13. Since the valve member 5 from section leading to the combustion chamber in the sealing section 103 tapered towards, is a pressure shoulder 11 on the valve member 5 formed, which is arranged in the first pressure chamber 9. at a corresponding fuel pressure in the pressure chamber 9 results a hydraulic force on the pressure shoulder 11, the a component acting in the longitudinal direction of the valve member 5 has, which is opposite to the closing force. To this The valve member 5 can be pressure-controlled by the Pressure in the first pressure chamber 9 in the longitudinal direction against the Moving closing force and thus the injection openings 17 open and open heading.

Die Funktionsweise des Kraftstoffeinspritzventils ist wie folgt: Zu Beginn der Einspritzung wird Kraftstoff unter hohem Druck durch den Zulaufkanal 7 in den ersten Druckraum 9 geleitet. Von dort strömt der Kraftstoff durch die Drosselbohrungen 40 in den zweiten Druckraum 19, so daß auch dort der Kraftstoffdruck zunimmt. Erreicht der Kraftstoffdruck im ersten Druckraum 9 ein bestimmtes Niveau, so wird durch die hydraulische Kraft auf die Druckschulter 11 eine Kraft entgegen der Schließkraft auf das Ventilglied 5 ausgeübt, die dieses in axialer Richtung vom Ventilsitz 13 wegbewegt. Hierdurch hebt die Ventildichtfläche 15 vom Ventilsitz 13 ab und gibt die Einspritzöffnungen 17 frei. Solange sich die Steuerkante 34 des Ringbunds 22 innerhalb des Bohrungsführungsabschnitts 203 befindet, kann der Kraftstoff nur durch die Drosselbohrungen 40 vom ersten Druckraum 9 in den zweiten Druckraum 19 und von dort durch die Einspritzöffnungen 17 in den Brennraum der Brennkraftmaschine gelangen. Durch diese Drosselung des Zuflusses wird nur ein geringer Druck im zweiten Druckraum 19 aufgebaut und so zu Beginn der Einspritzung nur wenig Kraftstoff pro Zeiteinheit in den Brennraum der Brennkraftmaschine eingespritzt. Erreicht die Steuerkante 34 die Dichtkante 32 und passiert diese in Öffnungsrichtung des Ventilglieds 5, so wird zwischen dem Ringbund 22 und der Bohrung 3 ein Ringspalt aufgesteuert, durch den der Kraftstoff jetzt nahezu ungedrosselt in die Ringnut 26 und durch die Anschliffe 28 in den zweiten Druckraum 19 fließen kann. Da jetzt erheblich mehr Kraftstoff in den zweiten Druckraum 19 fließt, steigt dort der Druck weiter an und Kraftstoff kann jetzt mit einem hohen Druck und damit hoher Rate in den Brennraum der Brennkraftmaschine eingespritzt werden. Soll die Einspritzung beendet werden, so wird die Kraftstoffzufuhr durch den Zulaufkanal 7 unterbrochen, und durch den abfallenden Kraftstoffdruck im ersten Druckraum 9 und somit auch im zweiten Druckraum 19 verringert sich die hydraulische Kraft auf das Ventilglied 5, bis die Schließkraft größer wird als die in axialer Richtung wirkenden Komponenten der hydraulischen Kräfte, und das Ventilglied 5 fährt wieder in die Schließposition zurück.The fuel injector works like follows: At the beginning of the injection, fuel becomes too high Pressure through the inlet channel 7 into the first pressure chamber 9 directed. From there, the fuel flows through the throttle bores 40 in the second pressure chamber 19, so that there too the fuel pressure increases. Reaches the fuel pressure in the first pressure chamber 9 a certain level, so by the hydraulic force on the pressure shoulder 11 opposes a force the closing force exerted on the valve member 5, the this moves away from the valve seat 13 in the axial direction. As a result, the valve sealing surface 15 lifts off the valve seat 13 and opens the injection openings 17. As long as the Control edge 34 of the collar 22 within the bore guide section 203 is located, the fuel can only through the throttle bores 40 from the first pressure chamber 9 into the second Pressure chamber 19 and from there through the injection openings 17 get into the combustion chamber of the internal combustion engine. By this throttling of the inflow becomes only a slight pressure built up in the second pressure chamber 19 and so at the beginning of the injection only little fuel per unit of time in the combustion chamber injected into the internal combustion engine. Reaches the control edge 34 the sealing edge 32 and passes this in the opening direction of the valve member 5, so between the collar 22 and the bore 3 opened an annular gap through which the fuel is now almost unthrottled in the annular groove 26 and through the bevels 28 into the second pressure chamber 19th can flow. Since now significantly more fuel in the flows in the second pressure chamber 19, the pressure there rises further and fuel can now with a high pressure and therefore injected at a high rate into the combustion chamber of the internal combustion engine become. If the injection is to be ended, so the fuel supply is interrupted by the inlet channel 7, and by the falling fuel pressure in the first Pressure chamber 9 and thus also reduced in the second pressure chamber 19 the hydraulic force on the valve member 5 until the closing force becomes greater than that in the axial direction acting components of the hydraulic forces, and the valve member 5 returns to the closed position.

Figur 4 zeigt ein weiteres Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils und Figur 5 einen Querschnitt durch das in Figur 4 dargestellte Kraftstoffeinspritzventil entlang der Linie V-V. Der Drosselkanal zwischen dem ersten Druckraum 9 und dem zweiten Druckraum 19 ist hier durch zwei Drosselausnehmungen 42 am Ringbund 22 ausgebildet, die als flächenhafte Anschliffe parallel zur Längsachse 6 des Ventilglieds 5 ausgeführt sind. Es kann auch vorgesehen sein, daß mehr als zwei Drosselausnehmungen 42 am Ringbund 22 ausgebildet sind. Diese werden dabei vorzugsweise gleichmäßig über den Umfang des Ringbunds 22 verteilt angeordnet, um einen gleichmäßigen Kraftstoffzufluß zum zweiten Druckraum 19 zu ermöglichen.Figure 4 shows a further embodiment of the invention Fuel injection valve and Figure 5 a Cross section through the fuel injector shown in Figure 4 along the line V-V. The throttle channel between the first pressure chamber 9 and the second pressure chamber 19 is here through two throttle recesses 42 on the collar 22 trained as parallel grindings parallel to Longitudinal axis 6 of the valve member 5 are executed. It can also be provided that more than two throttle recesses 42 are formed on the collar 22. These are preferred evenly distributed over the circumference of the collar 22 arranged to provide a steady fuel flow to enable the second pressure chamber 19.

In den Ausführungsbeispielen der Figuren 2 und 4 ist die Ringschulter 30 abgeschrägt ausgebildet, so daß sie mit der Längsachse 6 des Ventilglieds 5 einen Winkel einschließt. In the exemplary embodiments in FIGS. 2 and 4, the Ring shoulder 30 bevelled, so that it with the Longitudinal axis 6 of the valve member 5 encloses an angle.

Bei einer Ringschulter 30, die in einer Radialebene des Ventilglieds 5 angeordnet ist, wäre ein großer Aufwand nötig, um den fertigungstechnisch notwendigen Radius am Übergang der Bohrung 3 zur Ringschulter 30 so klein und in so enger Toleranz zu fertigen, daß er nicht bis in die Dichtkante 32 ausläuft. Zudem würde ein solcher Radius eine scharfe Kerbe bedeuten und damit eine signifikante Schwächung des Ventilkörpers 1 verbunden mit einer verminderten Druckschwellfestigkeit. In diesem Fall wäre die Lage der Dichtkante 32 nur schwer exakt zu positionieren und nur mit großem Aufwand zu vermessen. Eine angeschrägte Ringschulter 30 läßt hingegen einen größeren Radius mit größerer Toleranz zu, ohne in die Dichtkante 32 auszulaufen. Dies ermöglicht so eine gute Fertigbarkeit und Meßbarkeit der sehr wichtigen Lage der Dichtkante 32.With an annular shoulder 30 which is in a radial plane of the valve member 5 is arranged, a great effort would be necessary around the production-related radius at the transition the bore 3 to the ring shoulder 30 so small and so tight Tolerance to manufacture that it does not reach the sealing edge 32nd expires. In addition, such a radius would be a sharp notch mean and thus a significant weakening of the valve body 1 combined with a reduced pressure threshold strength. In this case, the position of the sealing edge 32 would only be difficult to position exactly and only with great effort measured. A beveled ring shoulder 30, however, leaves a larger radius with greater tolerance without entering the Leak sealing edge 32. This enables good producibility and measurability of the very important position of the sealing edge 32nd

Claims (6)

  1. Fuel injection valve for internal combustion engines, with a valve body (1), in which a piston-shaped valve member (5) is arranged longitudinally displaceably in a bore (3), which valve member (5) controls at least one injection orifice (17) arranged at the combustion-space-side end of the bore (3) and which is guided with a sealing portion (105) facing away from the combustion space in the bore (3), and with an annular collar (22) which is arranged on the valve member (5) so as to face away from the combustion space in relation to the sealing portion (105) and which has an end face (37) facing the combustion space and an end face (36) facing away from the combustion space, and which annular collar (22) subdivides the space between the valve member (5) and the bore (3) into a first pressure space (9) facing away from the combustion space and capable of being filled with fuel and a second pressure space (19) facing the combustion space, and with a bore guide portion (203) of the bore (3), into which bore guide portion the annular collar (22) penetrates in the closing position of the valve member (5) and thus separates the two pressure spaces (9, 19), with the exception of a throttle cross section, and out of which the annular collar (22) emerges during the opening-stroke movement of the valve member (5) and thus connects the pressure spaces (9, 19) to one another, characterized in that the throttle cross section is at least one throttle duct (40, 42) which is formed in the annular collar (22) and which connects the two end faces (36, 37) of the annular collar (22) to one another.
  2. Fuel injection valve according to Claim 1, characterized in that the at least one throttle duct (40) runs within the valve member (5).
  3. Fuel injection valve according to Claim 2, characterized in that the at least one throttle duct is designed as a throttle bore (40) which runs at least approximately parallel to the longitudinal axis (6) of the valve member (5).
  4. Fuel injection valve according to Claim 3, characterized in that a multiplicity of throttle bores (40) are arranged preferably so as to be distributed uniformly over the circumference of the annular collar (22).
  5. Fuel injection valve according to Claim 1, characterized in that the throttle duct is formed by at least one sheet-like throttle recess (42) which is formed on the annular collar (22) and which is formed at least approximately parallel to the longitudinal axis (6) of the valve member (5).
  6. Fuel injection valve according to one of the preceding claims, characterized in that the valve member (5) has a guide portion (205), by means of which the valve member (5) is guided in the bore guide portion (203) and which is arranged so as to face the combustion space with respect to the annular collar (22), the guide portion (205) having at least one lateral ground-down portion (28) which lies in the prolongation of the at least one throttle duct (40).
EP01270695A 2000-12-16 2001-11-28 Fuel injection valve for internal combustion engines Expired - Lifetime EP1346143B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10062959 2000-12-16
DE10062959A DE10062959A1 (en) 2000-12-16 2000-12-16 Fuel injection valve for internal combustion engines
PCT/EP2001/013921 WO2002048536A1 (en) 2000-12-16 2001-11-28 Fuel injection valve for internal combustion engines

Publications (2)

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EP1346143A1 EP1346143A1 (en) 2003-09-24
EP1346143B1 true EP1346143B1 (en) 2004-06-16

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EP01270695A Expired - Lifetime EP1346143B1 (en) 2000-12-16 2001-11-28 Fuel injection valve for internal combustion engines

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US (1) US6886760B2 (en)
EP (1) EP1346143B1 (en)
JP (1) JP2004515706A (en)
DE (2) DE10062959A1 (en)
PL (1) PL355635A1 (en)
WO (1) WO2002048536A1 (en)

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Publication number Priority date Publication date Assignee Title
DE10346212A1 (en) * 2003-10-06 2005-04-21 Bosch Gmbh Robert Fuel injection valve for IC engines has fuel feed channel with throttle to form smallest flow profile from the feed channel to injection apertures
DE102004025729A1 (en) * 2004-05-26 2005-12-15 Robert Bosch Gmbh Fuel injection valve for an internal combustion engine
US7472844B2 (en) * 2005-12-21 2009-01-06 Caterpillar Inc. Fuel injector nozzle with tip alignment apparatus
JP4296519B2 (en) * 2006-12-19 2009-07-15 株式会社日立製作所 Fuel injection valve
JP2009138614A (en) * 2007-12-05 2009-06-25 Mitsubishi Heavy Ind Ltd Fuel injection valve of pressure accumulation-type fuel injection device
EP2083165A1 (en) * 2008-01-22 2009-07-29 Delphi Technologies, Inc. Injection nozzle
ATE551521T1 (en) * 2008-04-18 2012-04-15 Magneti Marelli Spa FUEL INJECTION NOZZLE WITH DIRECT CLOSURE OPERATION FOR COMBUSTION ENGINES
EP2216542A1 (en) * 2009-02-06 2010-08-11 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
DE102009046452A1 (en) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Injector for a leak-free fuel injector
EP2568157A1 (en) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Injection Nozzle
CN104061101A (en) * 2014-07-14 2014-09-24 北京亚新科天纬油泵油嘴股份有限公司 Fuel feed system oil sprayer and oil spray nozzle thereof
GB2559598B (en) * 2017-02-10 2020-04-08 Delphi Tech Ip Ltd Fuel injector nozzle assembly

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Publication number Priority date Publication date Assignee Title
US4987887A (en) * 1990-03-28 1991-01-29 Stanadyne Automotive Corp. Fuel injector method and apparatus
US5899385A (en) * 1995-07-21 1999-05-04 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19857244A1 (en) * 1998-12-11 2000-06-15 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19951964A1 (en) * 1999-10-28 2001-05-03 Bosch Gmbh Robert Fuel injection valve for internal combustion engines

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US20040031863A1 (en) 2004-02-19
JP2004515706A (en) 2004-05-27
US6886760B2 (en) 2005-05-03
DE10062959A1 (en) 2002-06-20
PL355635A1 (en) 2004-05-04
WO2002048536A1 (en) 2002-06-20
EP1346143A1 (en) 2003-09-24
DE50102645D1 (en) 2004-07-22

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