EP1825134B1 - Fuel injection nozzle - Google Patents

Fuel injection nozzle Download PDF

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Publication number
EP1825134B1
EP1825134B1 EP05815589A EP05815589A EP1825134B1 EP 1825134 B1 EP1825134 B1 EP 1825134B1 EP 05815589 A EP05815589 A EP 05815589A EP 05815589 A EP05815589 A EP 05815589A EP 1825134 B1 EP1825134 B1 EP 1825134B1
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EP
European Patent Office
Prior art keywords
nozzle
piston
chamber
fuel
opening direction
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
EP05815589A
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German (de)
French (fr)
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EP1825134A1 (en
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1825134A1 publication Critical patent/EP1825134A1/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
    • F02M61/20—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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

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.
  • Another example is from the EP-A-1 063 415 known.
  • the fuel injector for internal combustion engines according to the invention with the characterizing features of claim 1 has the advantage that the fuel injector is easy to control.
  • the separate structure of the control via separate control chambers of the two nozzle needles is particularly advantageous.
  • 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.
  • a high-pressure fuel line 7 is the Annulus 6 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.
  • a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 prevents fuel from either with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap which is connected via a bore 15 in the outer nozzle needle 5 to the annular space 6, even with open outer nozzle needle 4 passes through second injection holes 16 in the combustion chamber of the internal combustion engine.
  • the two sealing seats 9, 13 are formed by a common conical surface.
  • the closing springs 8, 12 of the two nozzle needles 4, 5 are supported on a piston 17 , which is guided axially displaceably in a translator piston 18 open at the bottom.
  • the booster piston 18 forms the actuator of an inversely operated piezoelectric actuator 19.
  • the piezoelectric actuator 19 is energized, whereby the booster piston 18 against the action of a tension spring (for example, Bourdon tube) 20 is depressed downward.
  • the piston 17 is hydraulically coupled to the booster piston 18 via a booster chamber 21, which is filled with fuel under rail pressure, to enable a 1: 1 temperature compensation of the actuator 19.
  • the two nozzle needle 4, 5 are guided in each case displaceably on the piston 17.
  • the piston 17 has a downwardly open piston chamber, at the chamber wall, the two nozzle needles 4, 5 are guided.
  • the piston 17 engages with an annular first projection 22, the outer nozzle needle 4 and with an annular second projection 23, the inner nozzle needle 5 in each case Opening direction.
  • the outer nozzle needle 4 is in the opening direction of the first projection 22, while the inner nozzle needle 5 is spaced in the opening direction of the second projection 23 by h 1 .
  • the outer nozzle needles 4 delimited by a control surface acting in the closing direction 24 in the piston chamber , a first nozzle rear chamber 25 which is connected via a first throttle 26 with a first control chamber 27 .
  • the first control chamber 27 is bounded radially inwardly by the outer nozzle needles 4, radially outwardly by a sealing sleeve 28, in the opening direction by the piston 17 and in the closing direction by the nozzle body 2.
  • the sealing sleeve 28 which is supported by a housing side supported compression spring 29 in abutment against a shoulder of the nozzle body 2, the first control chamber 27 is throttled connected to the high-pressure fuel line 7.
  • the inner nozzle needle 5 delimits, with a control surface 30 acting in the closing direction , in the piston chamber 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 piston 17, radially outward by a sealing sleeve 34, in the opening direction by the booster piston 18 and in the closing direction by the nozzle body 2.
  • the second control chamber 33 is throttled connected to the high-pressure fuel line 7.
  • the piston 17 After a preliminary stroke h 1 , the piston 17 also takes over the second projection 23 and the inner nozzle needle 5 in the opening direction.
  • the inner nozzle needle 5 lifts off from its sealing seat 13, and fuel from the annular space 6 is also injected via the now released second injection holes 16 in the combustion chamber. Since the rail pressure in the opening direction also acts on the sealing cone 14 of the inner nozzle needle 5, the inner nozzle needle 5 lifts off from the second projection 23 and is opened up against the action of the closing spring 12.
  • the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 19.

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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)

Abstract

Disclosed is a fuel injection nozzle (1) for internal combustion engines, comprising a nozzle member (2) with injection ports (11, 16), an outer valve needle (4) which is axially directed in a guiding bore (3) of the nozzle member (2), is embodied as a hollow needle, and controls injection of pressurized fuel through at least one first injection port (11), and an inner valve needle (5) that is coaxially guided within the outer valve needle (4) and controls injection of pressurized fuel through at least one second injection port (16). The inventive fuel injection nozzle (1) further comprises a plunger (17) which is guided in an axially movable manner and is provided with a first protrusion (22) that entrains the outer valve needle (4) in the opening direction thereof and a second protrusion (23) that entrains the inner valve needle (5) in the opening direction thereof following a preliminary lift (h1). The fuel injection nozzle (1) also comprises an actuator (19) for displacing the plunger (17), a first and a second rear nozzle chamber (25, 31 ), each of which is delimited by a control surface (24, 30) of the outer and inner valve needle (4, 5), respectively, said control surface (24, 30) being effective in the closing direction, a first control chamber (27) that is filled with fuel, is delimited by the plunger (17) in the opening direction, and is connected to the first rear nozzle chamber (25) via a throttle (26), as well as a second control chamber (33) which is filled with fuel, is delimited by the plunger (17) or an actuating member (18) of the actuator (19) in the opening direction, and is connected to the second rear nozzle chamber (31) via a throttle (32). The two valve needles (4, 5) can be displaced relative to the plunger (17) in the opening direction, counter to the effect of a closing spring (8, 12).

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.

Ein anderes Beispiel ist aus der EP-A-1 063 415 bekannt.Another example is from the EP-A-1 063 415 known.

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 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 gesteuert geöffnet und somit der Injektor optimal gesteuert werden.The fuel injector for internal combustion engines according to the invention with the characterizing features of claim 1 has the advantage that the fuel injector is easy to control. 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 controlled and thus the injector can be optimally controlled.

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. About a high-pressure fuel line 7 is the Annulus 6 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 weder bei geschlossener äußerer Düsennadel 4 aus dem zwischen beiden Düsennadeln 4, 5 vorhandenen Ringspalt, der über eine Bohrung 15 in der äußeren Düsennadel 5 an den Ringraum 6 angeschlossen ist, noch bei geöffneter äußerer Düsennadel 4 durch zweite Spritzlöcher 16 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. When the inner nozzle needle 5 is closed, a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 prevents fuel from either with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap which is connected via a bore 15 in the outer nozzle needle 5 to the annular space 6, even with open outer nozzle needle 4 passes through second injection holes 16 in the combustion chamber of the internal combustion engine. In the embodiment shown, the two sealing seats 9, 13 are formed by a common conical surface.

Die Schließfedern 8, 12 der beiden Düsennadeln 4, 5 sind an einem Kolben 17 abgestützt, der in einem nach unten offenen Übersetzerkolben 18 axial verschiebbar geführt ist. Der Übersetzerkolben 18 bildet das Stellglied eines invers betriebenen piezoelektrischen Stellantriebs 19. Im gezeigten geschlossenen Zustand beider Düsennadeln 4, 5 ist der piezoelektrische Stellantrieb 19 bestromt, wodurch der Übersetzerkolben 18 gegen die Wirkung einer Zugfeder (z.B. Rohrfeder) 20 nach unten gedrückt ist. Der Kolben 17 ist über einen Übersetzerraum 21, der mit unter Raildruck stehendem Kraftstoff gefüllt ist, hydraulisch mit dem Übersetzerkolben 18 gekoppelt, um einen 1:1-Temperaturausgleich des Stellantriebs 19 zu ermöglichen.The closing springs 8, 12 of the two nozzle needles 4, 5 are supported on a piston 17 , which is guided axially displaceably in a translator piston 18 open at the bottom. The booster piston 18 forms the actuator of an inversely operated piezoelectric actuator 19. In the depicted closed state of the two nozzle needles 4, 5, the piezoelectric actuator 19 is energized, whereby the booster piston 18 against the action of a tension spring (for example, Bourdon tube) 20 is depressed downward. The piston 17 is hydraulically coupled to the booster piston 18 via a booster chamber 21, which is filled with fuel under rail pressure, to enable a 1: 1 temperature compensation of the actuator 19.

Die beiden Düsennadel 4, 5 sind jeweils am Kolben 17 verschiebbar geführt. Dazu hat der Kolben 17 eine nach unten offene Kolbenkammer, an deren Kammerwand die beiden Düsennadeln 4, 5 geführt sind. Der Kolben 17 hintergreift mit einem ringförmigen ersten Vorsprung 22 die äußere Düsennadel 4 und mit einem ringförmigen zweiten Vorsprung 23 die innere Düsennadel 5 jeweils in Öffnungsrichtung. Im gezeigten geschlossenen Zustand der beiden Düsennadeln liegt die äußere Düsennadel 4 in Öffnungsrichtung am ersten Vorsprung 22 an, während die innere Düsennadel 5 in Öffnungsrichtung vom zweiten Vorsprung 23 um h1 beabstandet ist.The two nozzle needle 4, 5 are guided in each case displaceably on the piston 17. For this purpose, the piston 17 has a downwardly open piston chamber, at the chamber wall, the two nozzle needles 4, 5 are guided. The piston 17 engages with an annular first projection 22, the outer nozzle needle 4 and with an annular second projection 23, the inner nozzle needle 5 in each case Opening direction. In the closed state of the two nozzle needles shown the outer nozzle needle 4 is in the opening direction of the first projection 22, while the inner nozzle needle 5 is spaced in the opening direction of the second projection 23 by h 1 .

Die äußere Düsennadeln 4 begrenzt mit einer in Schließrichtung wirkenden Steuerfläche 24 in der Kolbenkammer einen ersten Düsenrückraum 25, der über eine erste Drossel 26 mit einem ersten Steuerraum 27 verbunden ist. Der erste Steuerraum 27 ist radial nach innen durch die äußere Düsennadeln 4, radial nach außen durch eine Dichthülse 28, in Öffnungsrichtung durch den Kolben 17 sowie in Schließrichtung durch den Düsenkörper 2 begrenzt. Über die Dichthülse 28, die durch eine gehäuseseitig abgestützte Druckfeder 29 in Anlage an eine Schulter des Düsenkörpers 2 abgestützt ist, ist der erste Steuerraum 27 gedrosselt an die Kraftstoff-Hochdruckleitung 7 angeschlossen.The outer nozzle needles 4 delimited by a control surface acting in the closing direction 24 in the piston chamber , a first nozzle rear chamber 25 which is connected via a first throttle 26 with a first control chamber 27 . The first control chamber 27 is bounded radially inwardly by the outer nozzle needles 4, radially outwardly by a sealing sleeve 28, in the opening direction by the piston 17 and in the closing direction by the nozzle body 2. About the sealing sleeve 28 which is supported by a housing side supported compression spring 29 in abutment against a shoulder of the nozzle body 2, the first control chamber 27 is throttled connected to the high-pressure fuel line 7.

In gleicher Weise begrenzt die innere Düsennadel 5 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 den Kolben 17, radial nach außen durch eine Dichthülse 34, in Öffnungsrichtung durch den Übersetzerkolben 18 sowie in Schließrichtung durch den Düsenkörper 2 begrenzt. Über die Dichthülse 34, die durch eine gehäuseseitig abgestützte Druckfeder 35 in Anlage an eine Schulter des Düsenkörpers 2 abgestützt ist, ist der zweite Steuerraum 33 gedrosselt an die Kraftstoff-Hochdruckleitung 7 angeschlossen.In the same way, the inner nozzle needle 5 delimits, with a control surface 30 acting in the closing direction , in the piston chamber 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 piston 17, radially outward by a sealing sleeve 34, in the opening direction by the booster piston 18 and in the closing direction by the nozzle body 2. About the sealing sleeve 34 which is supported by a housing side supported compression spring 35 in abutment against a shoulder of the nozzle body 2, the second control chamber 33 is throttled connected to the high-pressure fuel line 7.

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 19 nicht mehr bestromt wird, zieht die Zugfeder 20 den Übersetzerkolben 18 nach oben, d.h. in Öffnungsrichtung. Dadurch sinkt der Druck im Übersetzerraum 21 unter Raildruck, und über die hydraulische Kopplung wird auch der Kolben 17 nach oben gezogen, der über den ersten Vorsprung 22 die äußere Düsennadel 4 in Öffnungsrichtung mitnimmt. Die äußere Düsennadel 4 hebt von ihrem Dichtsitz 9 ab, und über die nun freigegebenen ersten Spritzlöcher 11 wird Kraftstoff aus dem Ringraum 6 in den Brennraum eingespritzt. Der Öffnungshub des Kolbens 17 führt zu einer Volumenvergrößerung im ersten Steuerraum 27, so dass der darin herrschende Raildruck sinkt. Über die Drossel 26 sinkt auch der Druck im ersten Düsenrückraum 25 unter den Raildruck ab. Dies führt, da am Dichtkonus 10 der äußeren Düsennadel 4 der Raildruck in Öffnungsrichtung wirkt, zu einem Abheben der äußeren Düsennadel 4 vom ersten Vorsprung 22, d.h. zu einem weiteren Aufsteuern der äußeren Düsennadel 4, gegen die Wirkung der Schließfeder 8.When the piezoelectric actuator 19 is no longer energized, pulls the tension spring 20, the booster piston 18 upwards, ie in the opening direction. As a result, the pressure in the booster chamber 21 drops below rail pressure, and via the hydraulic coupling and the piston 17 is pulled upwards, which entrains the outer nozzle needle 4 in the opening direction via the first projection 22. The outer nozzle needle 4 lifts off from its sealing seat 9, and on the now released first Spray holes 11, fuel is injected from the annular space 6 in the combustion chamber. The opening stroke of the piston 17 leads to an increase in volume in the first control chamber 27, so that the rail pressure prevailing therein decreases. About the throttle 26 and the pressure in the first nozzle rear chamber 25 drops below the rail pressure. This leads, since the sealing pressure of the outer nozzle needle 4 of the rail pressure acts in the opening direction, to lift the outer nozzle needle 4 from the first projection 22, ie to further control the outer nozzle needle 4, against the action of the closing spring. 8

Nach einem Vorhub h1 nimmt der Kolben 17 über den zweiten Vorsprung 23 auch die innere Düsennadel 5 in Öffnungsrichtung mit. Die innere Düsennadel 5 hebt von ihrem Dichtsitz 13 ab, und Kraftstoff aus dem Ringraum 6 wird auch über die nun freigegebenen zweiten Spritzlöcher 16 in den Brennraum eingespritzt. Da auch am Dichtkonus 14 der inneren Düsennadel 5 der Raildruck in Öffnungsrichtung wirkt, hebt die innere Düsennadel 5 vom zweiten Vorsprung 23 ab und wird gegen die Wirkung der Schließfeder 12 weiter aufgesteuert.After a preliminary stroke h 1 , the piston 17 also takes over the second projection 23 and the inner nozzle needle 5 in the opening direction. The inner nozzle needle 5 lifts off from its sealing seat 13, and fuel from the annular space 6 is also injected via the now released second injection holes 16 in the combustion chamber. Since the rail pressure in the opening direction also acts on the sealing cone 14 of the inner nozzle needle 5, the inner nozzle needle 5 lifts off from the second projection 23 and is opened up against the action of the closing spring 12.

Somit werden die beiden Düsennadeln 4, 5 mit nur minimalem Öffnungshub des Stellantriebs 19 weit aufgesteuert.Thus, the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 19.

Zum Schließen der Düsennadeln 4, 5 werden durch Bestromen des Stellantriebs 19 der Übersetzerkolben 17 und der Kolben 18 gegen die Wirkung der Zugfeder 20 in Schließrichtung verschoben, wodurch sich das Volumen der beiden Steuerräume 27, 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 19 of the booster piston 17 and the piston 18 against the action of the tension spring 20 in the closing direction, whereby the volume of the two control chambers 27, 33 is reduced. The prevailing pressure in each case rises above the rail pressure, and the nozzle needles 4, 5 close.

Claims (8)

  1. Fuel injection nozzle (1) for internal combustion engines, comprising a nozzle body (2) with spray holes (11, 16), an outer nozzle needle (4) which is guided axially in a guide bore (3) of the nozzle body (2) and which is designed 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 (16), having a piston (17) which is guided in an axially movable fashion and having an actuating drive (19) for moving the piston (17),
    characterized by:
    - a first projection (22) of the piston (17), which first projection (22) drives the outer nozzle needle (4) in its opening direction, and a second projection (23) of the piston (17), which second projection (23), after a pilot stroke (h1), drives the inner nozzle needle (5) in its opening direction, with the two nozzle needles (4, 5) being movable relative to the piston (17) in the opening direction in each case counter to the action of a closing spring (8, 12),
    - a first and a second nozzle rear chamber (25, 31) which are delimited in each case by a control surface (24, 30), which acts in the closing direction, of the outer and inner nozzle needle (4, 5) respectively,
    - a fuel-filled first control chamber (27) which is delimited in the opening direction by the piston (17) and which is connected via a throttle (26) to the first nozzle rear chamber (25), and
    - a fuel-filled second control chamber (33) which is delimited in the opening direction by the piston (17) or by an actuating member (18) of the actuating drive (19) and which is connected via a throttle (32) to the second nozzle rear chamber (31).
  2. Fuel injection nozzle according to Claim 1, characterized in that the piston (17) has a piston chamber which is open in the closing direction, and in that, in said piston chamber, the two nozzle needles (4, 5) delimit, in each case with their control surfaces (24, 30), the two nozzle rear chambers (25, 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 closing spring (8) of the outer nozzle needle (4) is arranged in the first nozzle rear chamber (25) and is supported on the piston (17).
  5. 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 second nozzle rear chamber (31) and is supported on the piston (17).
  6. Fuel injection nozzle according to one of the preceding claims, characterized in that the actuating drive (19) has, as an actuating element, a booster piston (18) which is hydraulically coupled in terms of movement to the piston (17).
  7. Fuel injection nozzle according to one of the preceding claims, characterized in that the actuating drive (19) is a piezoelectric drive which is operated inversely, counter to the action of a tension spring (20).
  8. Fuel injection nozzle according to one of the preceding claims, characterized in that the piston (17) drives the outer nozzle needle (4) in the opening direction only beyond a pilot stroke which is smaller than the pilot stroke (h1) of the inner nozzle needle (5).
EP05815589A 2004-11-26 2005-10-31 Fuel injection nozzle Expired - Fee Related EP1825134B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410057246 DE102004057246A1 (en) 2004-11-26 2004-11-26 fuel Injector
PCT/EP2005/055656 WO2006056522A1 (en) 2004-11-26 2005-10-31 Fuel injection nozzle

Publications (2)

Publication Number Publication Date
EP1825134A1 EP1825134A1 (en) 2007-08-29
EP1825134B1 true EP1825134B1 (en) 2009-12-16

Family

ID=35809575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05815589A Expired - Fee Related EP1825134B1 (en) 2004-11-26 2005-10-31 Fuel injection nozzle

Country Status (4)

Country Link
EP (1) EP1825134B1 (en)
JP (1) JP2008522069A (en)
DE (2) DE102004057246A1 (en)
WO (1) WO2006056522A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017034B4 (en) * 2006-04-11 2008-01-24 Siemens Ag Piezo actuator, method for producing a piezo actuator and injection system with such
FR2906848B1 (en) * 2006-10-09 2012-04-20 Renault Sas DEVICE FOR HOLDING A NEEDLE OF A FUEL INJECTOR, AND ASSOCIATED FUEL INJECTOR

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
DE10348925A1 (en) * 2003-10-18 2005-05-12 Bosch Gmbh Robert Fuel injector with multipart, directly controlled injection valve member
DE102004010183A1 (en) * 2004-03-02 2005-09-29 Siemens Ag Injector

Also Published As

Publication number Publication date
JP2008522069A (en) 2008-06-26
EP1825134A1 (en) 2007-08-29
DE502005008728D1 (en) 2010-01-28
WO2006056522A1 (en) 2006-06-01
DE102004057246A1 (en) 2006-06-01

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