EP1825137B1 - Fuel injection nozzle - Google Patents

Fuel injection nozzle Download PDF

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Publication number
EP1825137B1
EP1825137B1 EP05808077A EP05808077A EP1825137B1 EP 1825137 B1 EP1825137 B1 EP 1825137B1 EP 05808077 A EP05808077 A EP 05808077A EP 05808077 A EP05808077 A EP 05808077A EP 1825137 B1 EP1825137 B1 EP 1825137B1
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EP
European Patent Office
Prior art keywords
nozzle
piston
needle
nozzle needle
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 - Fee Related
Application number
EP05808077A
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German (de)
French (fr)
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EP1825137A1 (en
Inventor
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1825137A1 publication Critical patent/EP1825137A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention is based on a fuel injection nozzle according to the preamble of patent claim 1.
  • Such, for example from the DE 100 58 153 A1 known fuel injector for internal combustion engines has two nozzle needles, which can be controlled independently.
  • the outer nozzle needle is opened when the force exerted by the fuel on a pressure shoulder of the outer nozzle needle opening force is greater than the action of a closing spring.
  • the inner nozzle needle is opened by the pressure of a force acting in the closing direction on the nozzle needle hydraulic fluid is lowered in a control chamber.
  • the fuel injector according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that the fuel injector is easy and directly controlled.
  • the separate structure of the control via separate control chambers of the two nozzle needles is particularly advantageous.
  • a direct needle control By using a direct needle control, both nozzle needles can be opened quickly without leakage and thus the injector can be optimally controlled.
  • Advantage of the invention is the freedom from leaks at high needle speed and short travel of the actuator.
  • FIGURE shows the fuel injection nozzle according to the invention in a longitudinal section.
  • fuel injector 1 for internal combustion engines has a one-piece or multi-piece, cylindrical nozzle body 2, which projects with its free lower end into a combustion chamber not shown in detail of the engine to be supplied.
  • a guide bore 3 of the nozzle body 2 designed as a hollow needle outer nozzle needle 4 is axially displaceably guided, in which an inner nozzle needle 5 is arranged coaxially and also guided axially displaceable.
  • annular space 6 is formed, which is bounded by the outer nozzle needle 4 radially inwardly. Via a high-pressure fuel line 7 , the annular space 6 is connected to a fuel high-pressure accumulator, not shown (common rail).
  • a first closing spring 8 presses the outer nozzle needle 4 into a first sealing seat 9 at the combustion chamber end of the guide bore 3.
  • a sealing cone 10 of the outer nozzle needle 4 in conjunction with the first sealing seat 9, that fuel from the annular space. 6 passes through first injection holes 11 in the combustion chamber of the internal combustion engine.
  • a second closing spring 12 presses the inner nozzle needle 5 into a second sealing seat 13 at the combustion chamber end of the guide bore 3.
  • the inner nozzle needle 5 In the closed state of the inner nozzle needle 5 prevents a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 that fuel both with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap 15 which is connected via a bore 16 in the outer nozzle needle 5 to the annulus 6, and not open at the second outer nozzle needle 4 through second injection holes 17 in the combustion chamber Internal combustion engine passes.
  • the two sealing seats 9, 13 are formed by a common conical surface.
  • the closing spring 8 of the outer nozzle needle 4 is supported on the nozzle body 2 and the closing spring 12 of the inner nozzle needle 5 on a piston 18 which is guided axially displaceably in a translator piston 19 open at the bottom.
  • the booster piston 19 forms the actuator of an inversely operated piezoelectric actuator 20.
  • the piezoelectric actuator 20 is energized, whereby the booster piston 19 against the action of a tension spring (for example, Bourdon tube) 21 is depressed downward.
  • the piston 18 is hydraulically coupled to the booster piston 19 via a booster chamber 22, which is filled with fuel under rail pressure, to enable a 1: 1 temperature compensation of the actuator 20.
  • the two nozzle needles 4, 5 are each guided displaceably on the piston 18.
  • the piston 18 has a downwardly open piston chamber, on the chamber wall the two nozzle needles 4, 5 are guided.
  • the piston 18 engages with an annular first projection 23, the inner nozzle needle 5 and with an annular second projection 24, the outer nozzle needle 4 respectively in the opening direction.
  • the inner nozzle needle 5 delimits, with a control surface 25 acting in the closing direction , in the piston chamber a first nozzle rear space 26, which is connected via a first throttle 27 to a first control chamber 28 .
  • the first control chamber 28 is bounded radially inwardly by the piston 18, radially outward by a sealing sleeve 29, in the opening direction by the booster piston 19 and in the closing direction by the nozzle body 2.
  • the sealing sleeve 29 which is supported by a housing side supported compression spring (not shown) in abutment against a shoulder of the nozzle body 2, the first control chamber 28 is throttled connected to the high-pressure fuel line 7.
  • the outer nozzle needles 4 with a control surface 30 acting in the closing direction in the piston chamber define a second nozzle rear space 31, which is connected via a second throttle 32 to a second control chamber 33 .
  • the second control chamber 33 is bounded radially inwardly by the outer nozzle needle 4, in the opening direction by the piston 18 and otherwise by the nozzle body 2.
  • the second control chamber 33 is throttled connected in a manner not shown to the high-pressure fuel line 7, for example, also via a sealing sleeve.
  • the intermediate space 34, which is formed in the piston chamber between the second projection 24 and the outer nozzle needle 4, is connected via a connecting bore 35 in the outer nozzle needle 4 to a second control chamber 31.
  • the piston 18 After a preliminary stroke h 1 (h 1 > h 0 ), the piston 18 also takes over the second projection 24 and the outer nozzle needle 4 in the opening direction, wherein the fuel present in the intermediate space 34 is reduced via the connecting bore 35 into the second control chamber 31.
  • the outer nozzle needle 4 lifts off from its sealing seat 9, and fuel from the annular space 6 is also injected via the now released first injection holes 11 into the combustion chamber. Since also the sealing cone 10 of the outer nozzle needle 4, the rail pressure acts in the opening direction, the outer nozzle needle 4 lifts off from the second projection 24 and is turned on against the action of the closing spring 8 on.
  • the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 20.
  • the opening of the two nozzle needles can also be reversed if h 0 and h 1 are reversed, ie if h 0 > h 1 ⁇ 0.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzdüse nach der Gattung des Patentanspruchs 1.The invention is based on a fuel injection nozzle according to the preamble of patent claim 1.

Eine solche, beispielsweise aus der DE 100 58 153 A1 bekannte Kraftstoffeinspritzdüse für Brennkraftmaschinen weist zwei Düsennadeln auf, die unabhängig voneinander angesteuert werden können. Die äußere Düsennadel wird geöffnet, wenn die vom Kraftstoff auf eine Druckschulter der äußeren Düsennadel ausgeübte Öffnungskraft größer als die Wirkung einer Schließfeder ist. Die innere Düsennadel wird geöffnet, indem der Druck eines in Schließrichtung auf die Düsennadel wirkenden Hydraulikfluids in einem Steuerraum abgesenkt wird.Such, for example from the DE 100 58 153 A1 known fuel injector for internal combustion engines has two nozzle needles, which can be controlled independently. The outer nozzle needle is opened when the force exerted by the fuel on a pressure shoulder of the outer nozzle needle opening force is greater than the action of a closing spring. The inner nozzle needle is opened by the pressure of a force acting in the closing direction on the nozzle needle hydraulic fluid is lowered in a control chamber.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzdüse für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, dass die Kraftstoffeinspritzdüse einfach und direkt ansteuerbar ist. Dabei ist der separate Aufbau der Steuerung über getrennte Steuerräume der zwei Düsennadeln besonders vorteilhaft. Durch Verwendung einer direkten Nadelsteuerung können beide Düsennadeln schnell ohne Leckage gesteuert geöffnet und somit der Injektor optimal gesteuert werden. Vorteil der Erfindung ist die Leckagefreiheit bei hoher Nadelgeschwindigkeit und kurzem Stellweg des Stellantriebs.The fuel injector according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that the fuel injector is easy and directly controlled. In this case, the separate structure of the control via separate control chambers of the two nozzle needles is particularly advantageous. By using a direct needle control, both nozzle needles can be opened quickly without leakage and thus the injector can be optimally controlled. Advantage of the invention is the freedom from leaks at high needle speed and short travel of the actuator.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the subject invention are the description, the drawings and claims removed.

Zeichnungendrawings

Ein Ausführungsbeispiel der erfindungsgemäßen Kraftstoffeinspritzdüse ist in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt die erfindungsgemäße Kraftstoffeinspritzdüse in einem Längsschnitt.An embodiment of the fuel injection nozzle according to the invention is shown in the drawings and explained in more detail in the following description. The single FIGURE shows the fuel injection nozzle according to the invention in a longitudinal section.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die in Fig. 1 gezeigte Kraftstoffeinspritzdüse 1 für Brennkraftmaschinen weist einen ein- oder mehrstückigen, zylindrischen Düsenkörper 2 auf, der mit seinem freien unteren Ende in einen nicht näher gezeigten Brennraum der zu versorgenden Brennkraftmaschine ragt. In einer Führungsbohrung 3 des Düsenkörpers 2 ist eine als Hohlnadel ausgebildete äußere Düsennadel 4 axial verschiebbar geführt, in der eine innere Düsennadel 5 koaxial angeordnet und ebenfalls axial verschiebbar geführt ist.In the Fig. 1 shown fuel injector 1 for internal combustion engines has a one-piece or multi-piece, cylindrical nozzle body 2, which projects with its free lower end into a combustion chamber not shown in detail of the engine to be supplied. In a guide bore 3 of the nozzle body 2 designed as a hollow needle outer nozzle needle 4 is axially displaceably guided, in which an inner nozzle needle 5 is arranged coaxially and also guided axially displaceable.

Im Düsenkörper 2 ist ein Ringraum 6 ausgebildet, der durch die äußere Düsennadel 4 radial nach innen begrenzt ist. Über eine Kraftstoff-Hochdruckleitung 7 ist der Ringraum 6 mit einem nicht gezeigten Kraftstoff-Hochdruckspeicher (Common Rail) verbunden.In the nozzle body 2, an annular space 6 is formed, which is bounded by the outer nozzle needle 4 radially inwardly. Via a high-pressure fuel line 7 , the annular space 6 is connected to a fuel high-pressure accumulator, not shown (common rail).

Eine erste Schließfeder 8 presst die äußere Düsennadel 4 in einen ersten Dichtsitz 9 am brennraumseitigen Ende der Führungsbohrung 3. Im geschlossenen Zustand der äußeren Düsennadel 4 verhindert ein Dichtkonus 10 der äußeren Düsennadel 4 in Verbindung mit dem ersten Dichtsitz 9, dass Kraftstoff aus dem Ringraum 6 durch erste Spritzlöcher 11 in den Brennraum der Brennkraftmaschine gelangt. In gleicher Weise presst eine zweite Schließfeder 12 die innere Düsennadel 5 in einen zweiten Dichtsitz 13 am brennraumseitigen Ende der Führungsbohrung 3. Im geschlossenen Zustand der inneren Düsennadel 5 verhindert ein Dichtkonus 14 der inneren Düsennadel 5 in Verbindung mit dem zweiten Dichtsitz 13, dass Kraftstoff sowohl bei geschlossener äußerer Düsennadel 4 aus dem zwischen beiden Düsennadeln 4, 5 vorhandenen Ringspalt 15, der über eine Bohrung 16 in der äußeren Düsennadel 5 an den Ringraum 6 angeschlossen ist, als auch bei geöffneter äußerer Düsennadel 4 nicht durch zweite Spritzlöcher 17 in den Brennraum der Brennkraftmaschine gelangt. Im gezeigten Ausführungsbeispiel sind die beiden Dichtsitze 9, 13 durch eine gemeinsame Konusfläche gebildet.A first closing spring 8 presses the outer nozzle needle 4 into a first sealing seat 9 at the combustion chamber end of the guide bore 3. In the closed state of the outer nozzle needle 4 prevents a sealing cone 10 of the outer nozzle needle 4 in conjunction with the first sealing seat 9, that fuel from the annular space. 6 passes through first injection holes 11 in the combustion chamber of the internal combustion engine. In the same way, a second closing spring 12 presses the inner nozzle needle 5 into a second sealing seat 13 at the combustion chamber end of the guide bore 3. In the closed state of the inner nozzle needle 5 prevents a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 that fuel both with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap 15 which is connected via a bore 16 in the outer nozzle needle 5 to the annulus 6, and not open at the second outer nozzle needle 4 through second injection holes 17 in the combustion chamber Internal combustion engine passes. In the embodiment shown, the two sealing seats 9, 13 are formed by a common conical surface.

Die Schließfeder 8 der äußeren Düsennadel 4 ist am Düsenkörper 2 und die Schließfeder 12 der inneren Düsennadel 5 an einem Kolben 18 abgestützt, der in einem nach unten offenen Übersetzerkolben 19 axial verschiebbar geführt ist. Der Übersetzerkolben 19 bildet das Stellglied eines invers betriebenen piezoelektrischen Stellantriebs 20. Im gezeigten geschlossenen Zustand beider Düsennadeln 4, 5 ist der piezoelektrische Stellantrieb 20 bestromt, wodurch der Übersetzerkolben 19 gegen die Wirkung einer Zugfeder (z.B. Rohrfeder) 21 nach unten gedrückt ist. Der Kolben 18 ist über einen Übersetzerraum 22, der mit unter Raildruck stehendem Kraftstoff gefüllt ist, hydraulisch mit dem Übersetzerkolben 19 gekoppelt, um einen 1:1-Temperaturausgleich des Stellantriebs 20 zu ermöglichen.The closing spring 8 of the outer nozzle needle 4 is supported on the nozzle body 2 and the closing spring 12 of the inner nozzle needle 5 on a piston 18 which is guided axially displaceably in a translator piston 19 open at the bottom. The booster piston 19 forms the actuator of an inversely operated piezoelectric actuator 20. In the depicted closed state of the two nozzle needles 4, 5, the piezoelectric actuator 20 is energized, whereby the booster piston 19 against the action of a tension spring (for example, Bourdon tube) 21 is depressed downward. The piston 18 is hydraulically coupled to the booster piston 19 via a booster chamber 22, which is filled with fuel under rail pressure, to enable a 1: 1 temperature compensation of the actuator 20.

Die beiden Düsennadeln 4, 5 sind jeweils am Kolben 18 verschiebbar geführt. Dazu hat der Kolben 18 eine nach unten offene Kolbenkammer, an deren Kammerwand die beiden Düsennadeln 4, 5 geführt sind. Der Kolben 18 hintergreift mit einem ringförmigen ersten Vorsprung 23 die innere Düsennadel 5 und mit einem ringförmigen zweiten Vorsprung 24 die äußere Düsennadel 4 jeweils in Öffnungsrichtung. Im gezeigten geschlossenen Zustand der beiden Düsennadeln ist die innere Düsennadel 5 in Öffnungsrichtung vom ersten Vorsprung 23 um h0 (h0 ≥ 0) und die äußere Düsennadel 4 in Öffnungsrichtung vom zweiten Vorsprung 24 um h1 (h1 > h0) beabstandet.The two nozzle needles 4, 5 are each guided displaceably on the piston 18. For this purpose, the piston 18 has a downwardly open piston chamber, on the chamber wall the two nozzle needles 4, 5 are guided. The piston 18 engages with an annular first projection 23, the inner nozzle needle 5 and with an annular second projection 24, the outer nozzle needle 4 respectively in the opening direction. In the shown closed state of the two nozzle needles, the inner nozzle needle 5 in the opening direction from the first projection 23 by h 0 (h 0 ≥ 0) and the outer nozzle needle 4 in the opening direction of the second projection 24 by h 1 (h 1 > h 0 ) spaced.

Die innere Düsennadel 5 begrenzt mit einer in Schließrichtung wirkenden Steuerfläche 25 in der Kolbenkammer einen ersten Düsenrückraum 26, der über eine erste Drossel 27 mit einem ersten Steuerraum 28 verbunden ist. Der erste Steuerraum 28 ist radial nach innen durch den Kolben 18, radial nach außen durch eine Dichthülse 29, in Öffnungsrichtung durch den Übersetzerkolben 19 sowie in Schließrichtung durch den Düsenkörper 2 begrenzt. Über die Dichthülse 29, die durch eine gehäuseseitig abgestützte Druckfeder (nicht gezeigt) in Anlage an eine Schulter des Düsenkörpers 2 abgestützt ist, ist der erste Steuerraum 28 gedrosselt an die Kraftstoff-Hochdruckleitung 7 angeschlossen.The inner nozzle needle 5 delimits, with a control surface 25 acting in the closing direction , in the piston chamber a first nozzle rear space 26, which is connected via a first throttle 27 to a first control chamber 28 . The first control chamber 28 is bounded radially inwardly by the piston 18, radially outward by a sealing sleeve 29, in the opening direction by the booster piston 19 and in the closing direction by the nozzle body 2. About the sealing sleeve 29, which is supported by a housing side supported compression spring (not shown) in abutment against a shoulder of the nozzle body 2, the first control chamber 28 is throttled connected to the high-pressure fuel line 7.

In gleicher Weise begrenzt die äußere Düsennadeln 4 mit einer in Schließrichtung wirkenden Steuerfläche 30 in der Kolbenkammer einen zweiten Düsenrückraum 31, der über eine zweite Drossel 32 mit einem zweiten Steuerraum 33 verbunden ist. Der zweite Steuerraum 33 ist radial nach innen durch die äußere Düsennadel 4, in Öffnungsrichtung durch den Kolben 18 und im Übrigen durch den Düsenkörper 2 begrenzt. Der zweite Steuerraum 33 ist auf nicht gezeigte Weise an die Kraftstoff-Hochdruckleitung 7 gedrosselt angeschlossen, z.B. ebenfalls über eine Dichthülse. Der Zwischenraum 34, der in der Kolbenkammer zwischen zweitem Vorsprung 24 und äußerer Düsennadel 4 gebildet ist, ist über eine Verbindungsbohrung 35 in der äußeren Düsennadel 4 mit einem zweiten Steuerraum 31 verbunden.In the same way, the outer nozzle needles 4 with a control surface 30 acting in the closing direction in the piston chamber define a second nozzle rear space 31, which is connected via a second throttle 32 to a second control chamber 33 . The second control chamber 33 is bounded radially inwardly by the outer nozzle needle 4, in the opening direction by the piston 18 and otherwise by the nozzle body 2. The second control chamber 33 is throttled connected in a manner not shown to the high-pressure fuel line 7, for example, also via a sealing sleeve. The intermediate space 34, which is formed in the piston chamber between the second projection 24 and the outer nozzle needle 4, is connected via a connecting bore 35 in the outer nozzle needle 4 to a second control chamber 31.

Nachfolgend wird die Funktionsweise der erfindungsgemäßen Kraftstoffeinspritzdüse 1 beschrieben.The operation of the fuel injection nozzle 1 according to the invention will be described below.

Wenn der piezoelektrischen Stellantrieb 20 nicht mehr bestromt wird, zieht die Zugfeder 21 den Übersetzerkolben 19 nach oben, d.h. in Öffnungsrichtung. Dadurch sinkt der Druck im Übersetzerraum 22 unter Raildruck, und über die hydraulische Kopplung wird auch der Kolben 18 nach oben gezogen, der über den ersten Vorsprung 23 die innere Düsennadel 5 sofort (h0 = 0) oder erst nach einem Vorhub (h0 > 0) in Öffnungsrichtung mitnimmt. Die innere Düsennadel 5 hebt von ihrem Dichtsitz 13 ab, und über die nun freigegebenen zweiten Spritzlöcher 17 wird Kraftstoff über den Ringsspalt 15 aus dem Ringraum 6 in den Brennraum eingespritzt. Der Öffnungshub des Übersetzerkolbens 19 führt zu einer Volumenvergrößerung im ersten Steuerraum 28, so dass der darin herrschende Raildruck sinkt. Über die Drossel 27 sinkt auch der Druck im ersten Düsenrückraum 26 unter den Raildruck ab. Dies führt, da am Dichtkonus 14 der inneren Düsennadel 5 der Raildruck in Öffnungsrichtung wirkt, zu einem Abheben der inneren Düsennadel 5 vom ersten Vorsprung 23, d.h. zu einem weiteren Aufsteuem der inneren Düsennadel 5, gegen die Wirkung der Schließfeder 12.When the piezoelectric actuator 20 is no longer energized, pulls the tension spring 21, the booster piston 19 upwards, ie in the opening direction. Thereby decreases the pressure in the booster chamber 22 under rail pressure, and the hydraulic coupling and the piston 18 is pulled upwards, the first nozzle 23, the inner nozzle needle 5 immediately (h 0 = 0) or only after a preliminary stroke (h 0 > 0 ) in the opening direction. The inner nozzle needle 5 lifts off from its sealing seat 13, and via the now released second injection holes 17 fuel is injected via the annular gap 15 from the annular space 6 into the combustion chamber. The opening stroke of the booster piston 19 leads to an increase in volume in the first control chamber 28, so that the rail pressure prevailing therein decreases. About the throttle 27 and the pressure in the first nozzle rear chamber 26 drops below the rail pressure. This results because the sealing cone 14 of the inner nozzle needle 5, the rail pressure acts in the opening direction, to lift the inner nozzle needle 5 from the first projection 23, ie to a further Aufsteuem the inner nozzle needle 5, against the action of the closing spring 12th

Nach einem Vorhub h1 (h1 > h0) nimmt der Kolben 18 über den zweiten Vorsprung 24 auch die äußere Düsennadel 4 in Öffnungsrichtung mit, wobei der im Zwischenraum 34 vorhandene Kraftstoff über die Verbindungsbohrung 35 in den zweiten Steuerraum 31 abgebaut wird. Die äußere Düsennadel 4 hebt von ihrem Dichtsitz 9 ab, und Kraftstoff aus dem Ringraum 6 wird auch über die nun freigegebenen ersten Spritzlöcher 11 in den Brennraum eingespritzt. Da auch am Dichtkonus 10 der äußeren Düsennadel 4 der Raildruck in Öffnungsrichtung wirkt, hebt die äußere Düsennadel 4 vom zweiten Vorsprung 24 ab und wird gegen die Wirkung der Schließfeder 8 weiter aufgesteuert.After a preliminary stroke h 1 (h 1 > h 0 ), the piston 18 also takes over the second projection 24 and the outer nozzle needle 4 in the opening direction, wherein the fuel present in the intermediate space 34 is reduced via the connecting bore 35 into the second control chamber 31. The outer nozzle needle 4 lifts off from its sealing seat 9, and fuel from the annular space 6 is also injected via the now released first injection holes 11 into the combustion chamber. Since also the sealing cone 10 of the outer nozzle needle 4, the rail pressure acts in the opening direction, the outer nozzle needle 4 lifts off from the second projection 24 and is turned on against the action of the closing spring 8 on.

Somit werden die beiden Düsennadeln 4, 5 mit nur minimalem Öffnungshub des Stellantriebs 20 weit aufgesteuert.Thus, the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 20.

Zum Schließen der Düsennadeln 4, 5 werden durch Bestromen des Stellantriebs 20 der Übersetzerkolben 19 und der Kolben 18 gegen die Wirkung der Zugfeder 21 in Schließrichtung verschoben, wodurch sich das Volumen der Steuerräume 28, 33 verringert. Der darin jeweils herrschende Druck steigt über den Raildruck an, und die Düsennadeln 4, 5 schließen.To close the nozzle needles 4, 5 are moved by energizing the actuator 20 of the booster piston 19 and the piston 18 against the action of the tension spring 21 in the closing direction, whereby the volume of the control chambers 28, 33 is reduced. The prevailing pressure in each case rises above the rail pressure, and the nozzle needles 4, 5 close.

Das Öffnen der beiden Düsenadeln kann auch umgekehrt erfolgen, wenn h0 und h1 vertauschtwerden, d.h. wenn h0 > h1 ≥ 0.The opening of the two nozzle needles can also be reversed if h 0 and h 1 are reversed, ie if h 0 > h 1 ≥ 0.

Claims (8)

  1. Fuel injection nozzle (1) for internal combustion engines, comprising a nozzle body (2) with spray holes (11, 17), an outer nozzle needle (4) which is guided axially in a guide bore (3) of the nozzle body (2) and which is embodied as a hollow needle and which controls the injection of highly pressurized fuel through at least one first spray hole (11), and an inner nozzle needle (5) which is guided coaxially in the outer nozzle needle (4) and which controls the injection of highly pressurized fuel through at least one second spray hole (17),
    characterized by:
    - an axially movably guided piston (18) having a first projection (23), which drives the inner nozzle needle (5) in its opening direction, and having a second projection (24) which, after a pilot stroke (h1), drives the outer nozzle needle (4) in its opening direction, with the two nozzle needles (4, 5) being moveable relative to the piston (18) in the opening direction in each case counter to the action of a closing spring (8, 12),
    - an actuating drive (20) for moving the piston (18),
    - a first and a second nozzle rear space (26, 31) which are in each case delimited by a control face (25, 30), which acts in the closing direction, of the inner and of the outer nozzle needle (4, 5) respectively,
    - a fuel-filled first control space (28) which is delimited in the opening direction by the piston (18) or an actuating element (19) of the actuating drive (20) and is connected by means of a throttle (27) to the first nozzle rear space (26), and
    - a fuel-filled second control space (33) which is delimited in the opening direction by the piston (18) and is connected by means of a throttle (32) to the second nozzle rear space (31).
  2. Fuel injection nozzle according to Claim 1, characterized in that the piston (18) has a piston chamber which is open in the closing direction and in that, in said chamber, the two nozzle needles (4, 5), in each case with their control faces (25, 30), delimit the two nozzle rear spaces (26, 31).
  3. Fuel injection nozzle according to Claim 2, characterized in that the two nozzle needles (4, 5) are guided on the chamber wall of the piston chamber.
  4. Fuel injection nozzle according to one of the preceding claims, characterized in that the piston (18) drives the inner nozzle needle (5) in the opening direction only beyond a pilot stroke (h0), and said pilot stroke (h0) is smaller than the pilot stroke (h1) of the outer nozzle needle (4).
  5. Fuel injection nozzle according to one of the preceding claims, characterized in that the closing spring (8) of the outer nozzle needle (4) is arranged in an annular space (6), which is connected to the high-pressure fuel line (7) and which is delimited radially at the inside by the outer nozzle needle (4), and is supported on the nozzle body (2).
  6. Fuel injection nozzle according to one of the preceding claims, characterized in that the closing spring (12) of the inner nozzle needle (5) is arranged in the first nozzle rear space (26) and is supported on the piston (18).
  7. Fuel injection nozzle according to one of the preceding claims, characterized in that the actuating drive (20) has, as an actuating element, a booster piston (19) which is hydraulically coupled in terms of movement to the piston (18).
  8. Fuel injection nozzle according to one of the preceding claims, characterized in that the actuating drive (20) is a piezoelectric drive which is inversely operated counter to the action of a tension spring (21).
EP05808077A 2004-11-26 2005-10-31 Fuel injection nozzle Expired - Fee Related EP1825137B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410057245 DE102004057245A1 (en) 2004-11-26 2004-11-26 fuel Injector
PCT/EP2005/055653 WO2006056521A1 (en) 2004-11-26 2005-10-31 Fuel injection nozzle

Publications (2)

Publication Number Publication Date
EP1825137A1 EP1825137A1 (en) 2007-08-29
EP1825137B1 true EP1825137B1 (en) 2008-03-19

Family

ID=35485481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05808077A Expired - Fee Related EP1825137B1 (en) 2004-11-26 2005-10-31 Fuel injection nozzle

Country Status (3)

Country Link
EP (1) EP1825137B1 (en)
DE (2) DE102004057245A1 (en)
WO (1) WO2006056521A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050382B4 (en) * 2008-10-02 2014-07-03 Motorenfabrik Hatz Gmbh & Co Kg Injection system for the operation of small diesel engines
DE102008050381B4 (en) * 2008-10-02 2014-09-25 Motorenfabrik Hatz Gmbh & Co Kg Injection system for diesel fuel via a Common Rail (CR)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9914642D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
DE10058153A1 (en) * 2000-11-22 2002-06-06 Bosch Gmbh Robert Injection nozzle with separately controllable nozzle needles
JP2002221117A (en) * 2001-01-26 2002-08-09 Denso Corp Fuel injection valve
JP3865222B2 (en) * 2002-03-05 2007-01-10 株式会社デンソー Fuel injection device

Also Published As

Publication number Publication date
EP1825137A1 (en) 2007-08-29
WO2006056521A1 (en) 2006-06-01
DE502005003396D1 (en) 2008-04-30
DE102004057245A1 (en) 2006-06-01

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