EP1339966B1 - Injection nozzle comprising two separately controllable nozzle needles - Google Patents

Injection nozzle comprising two separately controllable nozzle needles Download PDF

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Publication number
EP1339966B1
EP1339966B1 EP01997634A EP01997634A EP1339966B1 EP 1339966 B1 EP1339966 B1 EP 1339966B1 EP 01997634 A EP01997634 A EP 01997634A EP 01997634 A EP01997634 A EP 01997634A EP 1339966 B1 EP1339966 B1 EP 1339966B1
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EP
European Patent Office
Prior art keywords
nozzle
injection
needle
nozzle needle
pressure
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
EP01997634A
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German (de)
French (fr)
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EP1339966A1 (en
Inventor
Gerhard Mack
Thomas Kuegler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1339966A1 publication Critical patent/EP1339966A1/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
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to an injection nozzle for internal combustion engines according to the preamble of claim 1.
  • the two nozzle needles are controlled separately from one another.
  • the operating behavior of the second nozzle needle scatters relatively strong at different identical nozzle needles.
  • the two nozzle needles are each controlled by a high-pressure fuel pump.
  • the object of the invention is to provide an injection nozzle which is more variable in terms of injection molding and atomization and in which the operating behavior of various series-produced injection nozzles is spread within narrow limits. This makes it possible to use internal combustion engines that are more economical in consumption, lower emissions and quieter.
  • the injection nozzle according to the invention and inexpensive to manufacture and without larger Changes to the cylinder head of the internal combustion engine can be used.
  • injection systems should be cheaper than known systems with the same variability.
  • the at least one first injection hole can be controlled in a simple manner independently of the at least one second injection hole. This makes it possible in certain operating points of the internal combustion engine during injection to open only the at least one first injection hole and thus to inject the fuel quantity to be injected through a relatively small injection hole cross-section into the combustion chamber. As a result, first, smaller amounts of fuel injection can be injected with greater precision and, moreover, it is distributed at high speed through the at least one first Spray hole in the combustion chamber injected fuel better, which has a positive effect on the efficiency and emission and noise behavior of the internal combustion engine.
  • the stroke stop according to the invention the maximum opening of the second nozzle needle is set constructively with great repeatability.
  • the at least one second injection hole can be opened immediately after opening the first injection hole or with a freely selectable time delay, so that a large amount of fuel can be injected into the combustion chamber through the two injection holes in the shortest possible time. Due to the time delay of the opening of the first and second injection hole, the injection process can be freely formed within a large range. This results in advantages in terms of efficiency, noise and emission behavior of the internal combustion engine.
  • the injection nozzle according to the invention does not take up more space than an injection nozzle according to the prior art and still comes without miniaturized components, which has a positive effect on the manufacturing costs and mass production.
  • a controllable with a control pressure control space is present, and that one on the second Düesennadel acting and arranged in the control chamber second nozzle spring is present, so that the second nozzle needle is pressed by the second nozzle spring in its closed position and the closing force, which is composed of the spring force of the second nozzle spring and the pressure resulting from the control pressure in the control chamber, by the Control of the control pressure can be controlled within wide limits and with high temporal resolution.
  • the nozzle body is made in several parts and has an intermediate ring and a nozzle holding body, and / or that in the guide bore a guide bush is provided, which also serve as a stroke stop for the second nozzle needle can.
  • a guide bush is u. a. therefore particularly advantageous because the guide bush wear-resistant material can be made and in the case of Verscheli touchs the guide bushing only the guide bush, but not the entire injector must be replaced.
  • the intermediate ring serves as a stroke stop for the first nozzle needle, so that the stroke of the first nozzle needle is adjustable with great accuracy.
  • a control piston is guided in the guide bush, which delimits the control chamber, and transfers the pressure force resulting from the control pressure in the control chamber to the second nozzle needle, so that the end face of the control piston can be selected independently of the diameter of the guide bore.
  • the first nozzle spring at least indirectly, for example via a shim, supported on the guide bushing on the nozzle body.
  • the guide bush can also serve as a stroke stop for the second nozzle needle, so that their stroke is limited.
  • a pressure pin is provided between the first nozzle spring and the first nozzle needle, which transmits the closing force of the first nozzle spring to the first nozzle needle, so that a compact and simple design is realized.
  • the pressure pin serves as a stroke stop for the second nozzle needle
  • the stroke stop for the second nozzle needle can be set more precisely, since the axial distance of the second sealing cone and stroke stop is very short.
  • the second nozzle needle is closed at the same time with the first nozzle needle, so that undesired fuel spills in the combustion chamber are avoided by the second injection holes.
  • the pressure pin is guided by the nozzle body, in particular by the intermediate ring of the nozzle body, and / or that the pressure pin takes over the guidance of the second nozzle needle at least partially, so that production, assembly and function are further improved.
  • the second nozzle needle is made in two parts, so that the manufacture and assembly are simplified.
  • the cross section of the at least one first injection hole and the cross section of the at least one second injection hole is the same, so that there is good atomization of the fuel in the combustion chamber at all operating points.
  • FIG. 1 shows an embodiment of an injection nozzle according to the invention is shown in longitudinal section.
  • a nozzle body 1 To a nozzle body 1, an intermediate disc 3 and a nozzle holding body 5 close.
  • Nozzle body 1, washer 3 and nozzle holding body 5 may also be integrally formed.
  • the multi-part embodiment shown in Figure 1 offers advantages in terms of production, installation and adjustment of the injector.
  • Nozzle body 1, washer 3 and nozzle holding body 5 are clamped together by a union nut 6.
  • the washer 3 simultaneously provides a stroke stop for the first Nozzle needle 7 is.
  • a first nozzle needle 7 is guided in a guide bore 9.
  • the guide bore 9 is also continued in the washer 3 and the nozzle holding body 5 and has changing diameter.
  • a pressure chamber 11 is formed, which is bounded by a pressure shoulder 13 of the first nozzle needle 7. Fuel can be conveyed by a high-pressure fuel pump, not shown, into the pressure chamber 11 via a high-pressure inlet 15.
  • a first nozzle spring 17 presses the first nozzle needle 7 via a pressure pin 18 into a first sealing seat 19 at the end of the nozzle body 1 which is shown only schematically in FIG.
  • first nozzle needle 7 In the closed state of the first nozzle needle 7 prevents a sealing cone 21 of the first nozzle needle 7 in conjunction with the first sealing seat 19 that fuel from the pressure chamber 11 passes through a first injection hole 23 in the combustion chamber, not shown in Figure 1, also not shown internal combustion engine.
  • the tip of the nozzle needle according to the invention is shown in detail in Figure 2 and will be explained in more detail with reference to this figure.
  • the operation of the first nozzle needle 7 corresponds to the operation of a conventional injection nozzle. If the pressure force exerted on the pressure shoulder 13 of the fuel located in the pressure chamber 11 is greater than the closing force of the first nozzle spring 17, the first nozzle needle 7 lifts off the first sealing seat 19 and thus releases the at least one first injection hole 23 and the injection begins. This fuel flows from the Pressure chamber 11 through an annular gap formed by the guide bore 9 and the first nozzle needle 7 (not shown) in the direction of the first injection hole 23rd
  • the first nozzle needle 7 has a central bore 25 in which a second nozzle needle 27 is guided.
  • the second nozzle needle 27 is designed in two parts in the embodiment shown in Figure 1 and consists of the sections 27a and 27b.
  • the two-part design of the second nozzle needle 27 has manufacturing and assembly reasons.
  • a guide bush 29 is provided at the upper end of the guide bore 9, in which a control piston 31 is guided.
  • a second nozzle spring 35 is arranged, which brings the control piston 31 in abutment with the second nozzle needle 27.
  • the end 33 of the guide bore 9 and the control piston 31 define a control chamber 37 into which a control pressure inlet 39 opens.
  • the control chamber 37 is filled with a hydraulic fluid whose pressure can be controlled via the control pressure inlet 39.
  • Hydaulikfluid can fuel, engine oil u. a. m. be used.
  • the pressure of the filled with hydraulic fluid control chamber 37 acts via the control piston 31 rectified with the second nozzle spring 35 to the second nozzle needle 27 and presses them into a second, not shown in Figure 1 valve seat.
  • the closing force of the second nozzle needle 27 can be reduced so far that the second nozzle needle 27 opens.
  • a bottom 41 of the guide bush 29, together with a shoulder 43 of the second nozzle needle a Hubanschlag for the second nozzle needle 27 is.
  • the first nozzle spring 17 is supported via a dial 45 and the guide bush 29 against the nozzle holding body 5 from.
  • the dial 45 By replacing the dial 45, the bias of the first nozzle spring 17 can be adjusted in the simplest way and with great precision.
  • the tip of an injection nozzle according to the invention is shown enlarged.
  • the first sealing cone 21 of the first nozzle needle 7 and the corresponding counterpart in the nozzle body 1 are designed so that there is a line contact.
  • This contact line is referred to as the first sealing seat 19 and is shown in Figure 2 as a dashed line.
  • the first sealing seat 19 separates the fuel, which is under high pressure in an annular gap 47 between guide bore 9 and first nozzle needle 7, from the first spray holes 23 when the injection nozzle is closed.
  • two first injection holes 23 are shown, which are opposite to each other.
  • second injection holes 49 are shown.
  • the second injection holes 49 are sealed by a second sealing cone 51 and the corresponding counterpart of the nozzle body 1.
  • the second sealing seat 53 there is again a line-shaped contact surface between the second sealing cone 51 and the nozzle body 1, which is referred to below as the second sealing seat 53.
  • the high-pressure fuel system which u. a. having a high-pressure fuel pump, promotes fuel at high pressure via the high-pressure inlet 15 into the pressure chamber 11, lifts the first nozzle needle 7 from the first sealing seat 19 as soon as the force exerted by the fuel in the pressure chamber 11 on the pressure shoulder 13 pressure force is greater than the closing force of the first nozzle spring 17.
  • the fuel from the pressure chamber 11 can flow through the annular gap 47 through the first injection holes-23 in the combustion chamber, not shown.
  • the injection is optimal when the fuel is injected exclusively through the first injection holes 23.
  • the second nozzle needle 27 can additionally be opened. This happens because the pressure in the control chamber 37 is lowered. Since the second sealing seat 53 has a smaller diameter than the second nozzle needle 27, the fuel under high pressure, which flows out of the annular gap 47 in the direction of the first injection holes 23, exerts an opposing force on an annular surface 55 of the second nozzle needle 27. The annular surface 27 is bounded by the second sealing seat 53 and the outer diameter of the second nozzle needle 27.
  • FIG. 3 a second embodiment of a non-injection nozzle according to the invention is shown. Because of the correspondence with the first embodiment with regard to components and function, reference is made to what has been said with respect to FIGS. 2 and 2 and only the differences are explained below.
  • the second nozzle needle 27 is divided at the level of the pressure pin 18.
  • the upper part 27b of the second nozzle needle 27 has a smaller diameter when passing through the pressure pin 18 than the lower part 27a of the second nozzle needle 27.
  • a center bore 57 of the pressure pin which guides the upper part 27b of the second nozzle needle 27 also has a smaller diameter Therefore, the lower in Fig. 3 end 59 of the pressure pin 18 forms a stroke stop for the nozzle needle 27. Because of the shorter compared to the first embodiment, the second seal seat (see Fig.
  • the stroke stop formed by the lower end 59 of the pressure pin 18 can firstly adjust the stroke of the nozzle needle more precisely and secondly it is ensured that the stroke of the second nozzle needle 27 depends on the stroke of the first nozzle needle 7.
  • the stroke of the second nozzle needle 27 may be greater than the stroke of the first nozzle needle 7 at the maximum in the stroke play designated 61 in FIG.
  • the pressure pin 18 When the first nozzle needle 7 closes, the pressure pin 18 also displaces the second nozzle needle 27 by the stroke clearance 61. As a result, after-splashes from the second spray holes 49 (see FIG. 2) into the combustion chamber (not shown) are prevented.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Einspritzdüse für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1.The invention relates to an injection nozzle for internal combustion engines according to the preamble of claim 1.

Bei dieser aus der EP 0 972 932 A1 bekannten Einspritzdüse werden die beiden Düsennadeln separat voneinander angesteuert. Dabei streut das Betriebsverhalten der zweiten Düsennadel bei verschiedenen baugleichen Düsennadeln relativ stark.
Bei einer aus der DE 42 14 646 A1 bekannten Einspritzdüse werden die beiden Düsennadeln über je eine Kraftstoffhochdruckpumpe angesteuert.In this injection nozzle known from EP 0 972 932 A1, the two nozzle needles are controlled separately from one another. The operating behavior of the second nozzle needle scatters relatively strong at different identical nozzle needles.
In one known from DE 42 14 646 A1 injection nozzle, the two nozzle needles are each controlled by a high-pressure fuel pump.

Der Erfindung liegt die Aufgabe zu Grunde, eine Einspritzdüse bereitzustellen, die hinsichtlich Einspritzverlaufformung und Kraftstoffzerstäubung variabler ist und bei der das Betriebsverhalten verschiedenen in Serie gefertigter Einspritzdüsen innerhalb enger Grenzen streut. Dadurch werden Brennkraftmaschinen ermöglicht, die sparsamer im Verbrauch, emissionsärmer und leiser sind. Außerdem soll die erfindungsgemäße Einspritzdüse und kostengünstig zu fertigen sein sowie ohne größere Änderungen am Zylinderkopf der Brennkraftmaschine einsetzbar sein. Schließlich sollen auch die mit den erfindungsgemäßen Einspritzdüsen ausgerüstenen Einspritzanlagen kostengünstiger sein als bekannte Systeme mit gleicher Variabilität.The object of the invention is to provide an injection nozzle which is more variable in terms of injection molding and atomization and in which the operating behavior of various series-produced injection nozzles is spread within narrow limits. This makes it possible to use internal combustion engines that are more economical in consumption, lower emissions and quieter. In addition, the injection nozzle according to the invention and inexpensive to manufacture and without larger Changes to the cylinder head of the internal combustion engine can be used. Finally, also equipped with the injectors according to the invention injection systems should be cheaper than known systems with the same variability.

Diese Aufgabe wird erfindungsgemäß gelöst durch doie kennzeichenden Merkmale des Anspruchs 1.This object is achieved by doie characterizing features of claim 1.

Vorteile der ErfindungAdvantages of the invention

Bei der erfindungsgemäßen Einspritzdüse kann das mindestens eine erste Spritzloch auf einfache Weise unabhängig von dem mindestens einen zweiten Spritzloch angesteuert werden. Dadurch besteht die Möglichkeit in bestimmten Betriebspunkten der Brennkraftmaschine bei der Einspritzung lediglich das mindestens eine erste Spritzloch zu öffnen und somit die einzuspritzende Kraftstoffmenge durch einen relativ kleinen Spritzlochquerschnitt in den Brennraum einzuspritzen. Dadurch können erstens kleinere Kraftstoffeinspritzmengen mit größerer Präzision eingespritzt werden und außerdem verteilt sich der mit hoher Geschwindigkeit durch das mindestens eine erste Spritzloch in den Brennraum eingespritzte Kraftstoff besser, was sich positiv auf Wirkungsgrad und Emissions- und Geräuschverhalten der Brennkraftmaschine auswirkt. Durch den erfindungsgemäßen Hubanschlag, wird die maximale Öffnung der zweiten Düsennadel mit großer Wiederholgenauigkeit konstruktiv festgelegt.In the injection nozzle according to the invention, the at least one first injection hole can be controlled in a simple manner independently of the at least one second injection hole. This makes it possible in certain operating points of the internal combustion engine during injection to open only the at least one first injection hole and thus to inject the fuel quantity to be injected through a relatively small injection hole cross-section into the combustion chamber. As a result, first, smaller amounts of fuel injection can be injected with greater precision and, moreover, it is distributed at high speed through the at least one first Spray hole in the combustion chamber injected fuel better, which has a positive effect on the efficiency and emission and noise behavior of the internal combustion engine. By the stroke stop according to the invention, the maximum opening of the second nozzle needle is set constructively with great repeatability.

In einer alternativen Betriebsweise kann unmittelbar nach dem Öffnen des ersten Spritzlochs oder mit einer frei wählbaren zeitlichen Verzögerung das mindestens eine zweite Spritzloch geöffnet werden, so dass eine große Kraftstoffmenge in kürzester Zeit durch die beiden Spritzlöcher in den Brennraum eingespritzt werden kann. Durch die zeitliche Verzögerung der Öffnung von erstem und zweitem Spritzloch, kann der Einspritzverlauf innerhalb eines großen Bereichs frei geformt werden. Dadurch ergeben sich Vorteile hinsichtlich Wirkungsgrad, Geräuschentwicklung und Emissionsverhalten der Brennkraftmaschine.In an alternative mode of operation, the at least one second injection hole can be opened immediately after opening the first injection hole or with a freely selectable time delay, so that a large amount of fuel can be injected into the combustion chamber through the two injection holes in the shortest possible time. Due to the time delay of the opening of the first and second injection hole, the injection process can be freely formed within a large range. This results in advantages in terms of efficiency, noise and emission behavior of the internal combustion engine.

Außerdem wird zur Ansteuerung der zweiten Düsennadel keine zweite Kraftstoffhochdruckpumpe benötigt. Es genügt vielmehr, eine einfache und kostengünstige Druckversorgung, beispielsweise von der Ölpumpe der Brennkraftmaschine. Darüber hinaus kann die zweite Düsennadel einfacher und genauer angesteuert werden, da zum Öffnen der zweiten Düsennadel lediglich der Druck im Steuerraum abgesenkt werden muß.In addition, no second high-pressure fuel pump is required to control the second nozzle needle. Rather, it is sufficient, a simple and inexpensive pressure supply, for example, from the oil pump of the internal combustion engine. In addition, the second nozzle needle can be controlled easier and more accurate, since only the pressure in the control chamber must be lowered to open the second nozzle needle.

Dadurch, dass die zweite Düsennadel innerhalb der ersten Düsennadel angeordnet ist, beansprucht die erfindungsgemäße Einspritzdüse nicht mehr Bauraum als eine Einspritzdüse nach dem Stand der Technik und kommt dennoch ohne miniaturisierte Bauteile aus, was sich positiv auf die Herstellungskosten und die Serienproduktion auswirkt.The fact that the second nozzle needle is arranged within the first nozzle needle, the injection nozzle according to the invention does not take up more space than an injection nozzle according to the prior art and still comes without miniaturized components, which has a positive effect on the manufacturing costs and mass production.

Bei einer Variante der Erfindung ist vorgesehen, dass im Düsenkörper ein mit einem Steuerdruck beaufschlagbarer Steuerraum vorhanden ist, und dass eine auf die zweite Düesennadel wirkende und im Steuerraum angeordnete zweite Düsenfeder vorhanden ist, so dass die zweite Düsennadel von der zweiten Düsenfeder in deren Schließstellung gedrückt wird und die Schließkraft, welche sich aus der Federkraft der zweiten Düsenfeder und der aus dem Steuerdruck im Steuerraum resultierenden Druckkraft zusammensetzt, durch die Steuerung des Steuerdrucks in weiten Grenzen und mit hoher zeitlicher Auflösung gesteuert werden kann.In a variant of the invention it is provided that in the nozzle body a controllable with a control pressure control space is present, and that one on the second Düesennadel acting and arranged in the control chamber second nozzle spring is present, so that the second nozzle needle is pressed by the second nozzle spring in its closed position and the closing force, which is composed of the spring force of the second nozzle spring and the pressure resulting from the control pressure in the control chamber, by the Control of the control pressure can be controlled within wide limits and with high temporal resolution.

Zur Vereinfachung der Herstellung und der Montage beim Zusammenbau der erfindungsgemäßen Einspritzdüse ist vorgesehen, dass der Düsenkörper mehrteilig ausgeführt ist und einen Zwischenring sowie einen Düsenhaltekörper aufweist, und/oder dass in der Führungsbohrung eine Führungsbuchse vorgesehen ist, die auch als Hubanschlag für die zweite Düsennadel dienen kann. Die Verwendung einer Führungsbuchse ist u. a. deshalb besonders vorteilhaft, weil die Führungsbuchse verschleißfesterem Material hergestellt werden kann und im Falle des Verschelißens der Führungsbuchse nur die Führungsbuchse, nicht aber der gesamte Injektor ausgewechselt werden muß.To simplify the manufacture and assembly during assembly of the injection nozzle according to the invention, it is provided that the nozzle body is made in several parts and has an intermediate ring and a nozzle holding body, and / or that in the guide bore a guide bush is provided, which also serve as a stroke stop for the second nozzle needle can. The use of a guide bush is u. a. therefore particularly advantageous because the guide bush wear-resistant material can be made and in the case of Verschelißens the guide bushing only the guide bush, but not the entire injector must be replaced.

Bei einer weiteren Ausführungsform der Erfindung dient der Zwischenring als Hubanschlag für die erste Düsennadel, so dass der Hub der ersten Düsennadel mit großer Genauigkeit einstellbar ist.In a further embodiment of the invention, the intermediate ring serves as a stroke stop for the first nozzle needle, so that the stroke of the first nozzle needle is adjustable with great accuracy.

Bei einer anderen Ausführungsform der Erfindung wird in der Führungsbuchse ein Steuerkolben geführt, der den Steuerraum begrenzt, und die aus dem Steuerdruck im Steuerraum resultierende Druckkraft auf die zweite Düsennadel überträgt, so dass die Stirnfläche des Steuerkolbens unabhängig vom Durchmesser der Führungsbohrung gewählt werden kann.In another embodiment of the invention, a control piston is guided in the guide bush, which delimits the control chamber, and transfers the pressure force resulting from the control pressure in the control chamber to the second nozzle needle, so that the end face of the control piston can be selected independently of the diameter of the guide bore.

Zur Vereinfachung der Montage und der Kalibrierung kann vorgesehen sein, dass sich die erste Düsenfeder mindestens mittelbar, beispielsweise über eine Einstellscheibe, über die Führungsbuchse am Düsenkörper abstützt. Die Führungsbuchse kann auch als Hubanschlag für die zweite Düsennadel dienen, so dass deren Hub begrenzt wird.For ease of assembly and calibration can be provided that the first nozzle spring at least indirectly, for example via a shim, supported on the guide bushing on the nozzle body. The guide bush can also serve as a stroke stop for the second nozzle needle, so that their stroke is limited.

In weiterer Ergänzung der Erfindung ist vorgesehen, dass zwischen erster Düsenfeder und erster Düsennadel ein Druckbolzen vorgesehen ist, der die Schließkraft der ersten Düsenfeder auf die erste Düsennadel überträgt, so dass eine kompakte und einfache Bauweise realisiert wird.In a further feature of the invention, it is provided that a pressure pin is provided between the first nozzle spring and the first nozzle needle, which transmits the closing force of the first nozzle spring to the first nozzle needle, so that a compact and simple design is realized.

Wenn, wie in weiterer vorteilhafter Ausgestaltung der Erfindung vorgesehen, der Druckbolzen als Hubanschlag für die zweite Düsennadel dient, kann der Hubanschlag für die zweite Düsennadel genauer eingestellt werden, da der axiale Abstand von zweitem Dichtkonus und Hubanschlag sehr kurz ist. Außerdem wird die zweite Düsennadel gleichzeitig mit der ersten Düsennadel geschlossen, so dass unerwünschte Nachspritzer von Kraftstoff in den Brennraum durch die zweiten Spritzlöcher vermieden werden.If, as provided in a further advantageous embodiment of the invention, the pressure pin serves as a stroke stop for the second nozzle needle, the stroke stop for the second nozzle needle can be set more precisely, since the axial distance of the second sealing cone and stroke stop is very short. In addition, the second nozzle needle is closed at the same time with the first nozzle needle, so that undesired fuel spills in the combustion chamber are avoided by the second injection holes.

Zusätzlich kann vorgesehen sein, dass der Druckbolzen vom Düsenkörper, insbesondere vom Zwischenring des Düsenkörpers, geführt wird, und/oder dass der Druckbolzen die Führung der zweiten Düsennadel mindestens teilweise übernimmt, so dass Herstellung, Montage und Funktion weiter verbessert werden.In addition, it can be provided that the pressure pin is guided by the nozzle body, in particular by the intermediate ring of the nozzle body, and / or that the pressure pin takes over the guidance of the second nozzle needle at least partially, so that production, assembly and function are further improved.

Bei einem anderen Ausführungsbeispiel der Erfindung ist die zweite Düsennadel zweiteilig ausgeführt, so dass die Herstellung und die Montage vereinfacht werden.In another embodiment of the invention, the second nozzle needle is made in two parts, so that the manufacture and assembly are simplified.

Bei einer anderen Ausgestaltung der Erfindung ist der Querschnitt des mindestens einen ersten Spritzlochs und der Querschnitt des mindestens einen zweiten Spritzlochs gleich groß, so dass sich bei allen Betriebspunkten eine gute Zerstäubung des Kraftstoffs im Brennraum ergibt.In another embodiment of the invention, the cross section of the at least one first injection hole and the cross section of the at least one second injection hole is the same, so that there is good atomization of the fuel in the combustion chamber at all operating points.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmenbar.Further advantages and advantageous embodiments of the invention are the following drawings, their description and the claims entnbar.

Zeichnungdrawing

Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Einspritzdüse
Figur 2
ein vergrößert dargestellter Ausschnitt aus Figur 1 und
Figur 3
ein zweites Ausführungsbeispiel einer nicht erfindungsgemäßen Einspritzdüse.
Show it:
FIG. 1
A first embodiment of an injection nozzle according to the invention
FIG. 2
an enlarged section of Figure 1 and
FIG. 3
A second embodiment of a non-inventive injection nozzle.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 ist ein Ausführungsbeispiel einer erfindungsgemäßen Einspritzdüse im Längsschnitt dargestellt. An einen Düsenkörper 1 schließen sich eine Zwischenscheibe 3 und ein Düsenhaltekörper 5 an. Düsenkörper 1, Zwischenscheibe 3 und Düsenhaltekörper 5 können auch einstückig ausgebildet sein. Die in Figur 1 dargestellte mehrteilige Ausführungsform bietet jedoch Vorteile hinsichtlich Fertigung, Montage und Einstellung der Einspritzdüse. Düsenkörper 1, Zwischenscheibe 3 und Düsenhaltekörper 5 sind durch eine Überwurfmutter 6 miteinander verspannt. Die Zwischenscheibe 3 stellt gleichzeitig einen Hubanschlag für die erste Düsennadel 7 dar.1 shows an embodiment of an injection nozzle according to the invention is shown in longitudinal section. To a nozzle body 1, an intermediate disc 3 and a nozzle holding body 5 close. Nozzle body 1, washer 3 and nozzle holding body 5 may also be integrally formed. However, the multi-part embodiment shown in Figure 1 offers advantages in terms of production, installation and adjustment of the injector. Nozzle body 1, washer 3 and nozzle holding body 5 are clamped together by a union nut 6. The washer 3 simultaneously provides a stroke stop for the first Nozzle needle 7 is.

Im Düsenkörper 1 ist eine erste Düsennadel 7 in einer Führungsbohrung 9 geführt. Die Führungsbohrung 9 setzt sich auch in der Zwischenscheibe 3 und dem Düsenhaltekörper 5 fort und hat wechselnde Durchmesser.In the nozzle body 1, a first nozzle needle 7 is guided in a guide bore 9. The guide bore 9 is also continued in the washer 3 and the nozzle holding body 5 and has changing diameter.

In dem Düsenkörper 1 ist ein Druckraum 11 ausgebildet, der von einer Druckschulter 13 der ersten Düsennadel 7 begrenzt wird. Über einen Hochdruckzulauf 15 kann Kraftstoff von einer nicht dargestellten Kraftstoffhochdruckpumpe in den Druckraum 11 gefördert werden.In the nozzle body 1, a pressure chamber 11 is formed, which is bounded by a pressure shoulder 13 of the first nozzle needle 7. Fuel can be conveyed by a high-pressure fuel pump, not shown, into the pressure chamber 11 via a high-pressure inlet 15.

Eine erste Düsenfeder 17 presst über einen Druckbolzen 18 die erste Düsennadel 7 in einen in Figur 1 nur andeutungsweise dargestellten ersten Dichtsitz 19 am Ende des Düsenkörpers 1.A first nozzle spring 17 presses the first nozzle needle 7 via a pressure pin 18 into a first sealing seat 19 at the end of the nozzle body 1 which is shown only schematically in FIG.

In geschlossenem Zustand der ersten Düsennadel 7 verhindert ein Dichtkonus 21 der ersten Düsennadel 7 in Verbindung mit dem ersten Dichtsitz 19, dass Kraftstoff aus dem Druckraum 11 durch ein erstes Spritzloch 23 in den in Figur 1 nicht dargestellten Brennraum einer ebenfalls nicht dargestellten Brennkraftmaschine gelangt. Die Spitze der erfindungsgemäßen Düsennadel ist in Figur 2 detailliert dargestellt und wird nachfolgend an Hand dieser Figur näher erläutert.In the closed state of the first nozzle needle 7 prevents a sealing cone 21 of the first nozzle needle 7 in conjunction with the first sealing seat 19 that fuel from the pressure chamber 11 passes through a first injection hole 23 in the combustion chamber, not shown in Figure 1, also not shown internal combustion engine. The tip of the nozzle needle according to the invention is shown in detail in Figure 2 and will be explained in more detail with reference to this figure.

Die Funktionsweise der ersten Düsennadel 7 entspricht der Funktionsweise einer herkömmlichen Einspritzdüse. Wenn die auf die Druckschulter 13 ausgeübte Druckkraft des im Druckraum 11 befindlichen Kraftstoffs größer ist als die Schließkraft der ersten Düsenfeder 17 hebt die erste Düsennadel 7 vom ersten Dichtsitz 19 ab und gibt somit das mindestens ein erstes Spritzloch 23 frei und die Einspritzung beginnt. Dabei fließt Kraftstoff aus dem Druckraum 11 durch einen von Führungsbohrung 9 und erster Düsennadel 7 gebildeten Ringspalt (nicht dargestellt) in Richtung des ersten Spritzlochs 23.The operation of the first nozzle needle 7 corresponds to the operation of a conventional injection nozzle. If the pressure force exerted on the pressure shoulder 13 of the fuel located in the pressure chamber 11 is greater than the closing force of the first nozzle spring 17, the first nozzle needle 7 lifts off the first sealing seat 19 and thus releases the at least one first injection hole 23 and the injection begins. This fuel flows from the Pressure chamber 11 through an annular gap formed by the guide bore 9 and the first nozzle needle 7 (not shown) in the direction of the first injection hole 23rd

Die erste Düsennadel 7 weist eine Mittenbohrung 25 auf in der eine zweite Düsennadel 27 geführt ist. Die zweite Düsennadel 27 ist in dem in Figur 1 dargestellten Ausführungsbeispiel zweiteilig ausgeführt und besteht aus den Abschnitten 27a und 27b. Die zweiteilige Ausführung der zweiten Düsennadel 27 hat fertigungs- und montagetechnische Gründe. Im Bereich des Düsenhaltekörpers 5 ist am oberen Ende der Führungsbohrung 9 eine Führungsbuchse 29 vorgesehen, in der ein Steuerkolben 31 geführt wird.The first nozzle needle 7 has a central bore 25 in which a second nozzle needle 27 is guided. The second nozzle needle 27 is designed in two parts in the embodiment shown in Figure 1 and consists of the sections 27a and 27b. The two-part design of the second nozzle needle 27 has manufacturing and assembly reasons. In the region of the nozzle holding body 5, a guide bush 29 is provided at the upper end of the guide bore 9, in which a control piston 31 is guided.

Zwischen dem Steuerkolben 31 und dem Ende 33 der Führungsbohrung 9 ist eine zweite Düsenfeder 35 angeordnet, welche den Steuerkolben 31 in Anlage zur zweiten Düsennadel 27 bringt. Das Ende 33 der Führungsbohrung 9 und der Steuerkolben 31 begrenzen einen Steuerraum 37 in den ein Steuerdruckzulauf 39 mündet. Der Steuerraum 37 ist mit einem Hydraulikfluid gefüllt, dessen Druck über den Steuerdruckzulauf 39 gesteuert werden kann. Als Hydaulikfluid kann Kraftstoff, Motoröl u. a. m. eingesetzt werden.Between the control piston 31 and the end 33 of the guide bore 9, a second nozzle spring 35 is arranged, which brings the control piston 31 in abutment with the second nozzle needle 27. The end 33 of the guide bore 9 and the control piston 31 define a control chamber 37 into which a control pressure inlet 39 opens. The control chamber 37 is filled with a hydraulic fluid whose pressure can be controlled via the control pressure inlet 39. As Hydaulikfluid can fuel, engine oil u. a. m. be used.

Der Druck des mit Hydraulikfluid gefüllten Steuerraums 37 wirkt über den Steuerkolben 31 gleichgerichtet mit der zweiten Düsenfeder 35 auf die zweite Düsennadel 27 und presst diese in einen zweiten, in Figur 1 nicht dargestellten Ventilsitz. Durch Absenken des Drucks im Steuerraum 37, kann die Schließkraft der zweiten Düsennadel 27 so weit verringert werden, dass die zweite Düsennadel 27 öffnet.The pressure of the filled with hydraulic fluid control chamber 37 acts via the control piston 31 rectified with the second nozzle spring 35 to the second nozzle needle 27 and presses them into a second, not shown in Figure 1 valve seat. By lowering the pressure in the control chamber 37, the closing force of the second nozzle needle 27 can be reduced so far that the second nozzle needle 27 opens.

Eine Unterseite 41 der Führungsbuchse 29 stellt zusammen mit einem Absatz 43 der zweiten Düsennadel einen Hubanschlag für die zweite Düsennadel 27 dar.A bottom 41 of the guide bush 29, together with a shoulder 43 of the second nozzle needle a Hubanschlag for the second nozzle needle 27 is.

In dem in Figur 1 dargestellten Ausführungsbeispiel stützt sich die erste Düsenfeder 17 über eine Einstellscheibe 45 und die Führungsbuchse 29 gegen den Düsenhaltekörper 5 ab. Durch Auswechseln der Einstellscheibe 45 kann die Vorspannung der ersten Düsenfeder 17 auf einfachste Weise und mit großer Präzision eingestellt werden.In the embodiment shown in Figure 1, the first nozzle spring 17 is supported via a dial 45 and the guide bush 29 against the nozzle holding body 5 from. By replacing the dial 45, the bias of the first nozzle spring 17 can be adjusted in the simplest way and with great precision.

In Figur 2 ist die Spitze einer erfindungsgemäßen Einspritzdüse vergrößert dargestellt. Der erste Dichtkonus 21 der ersten Düsennadel 7 und das entsprechende Gegenstück im Düsenkörper 1 sind so gestaltet, dass sich eine Linienberührung ergibt. Diese Berührungslinie wird als erster Dichtsitz 19 bezeichnet und ist in Figur 2 als gestrichelte Linie dargestellt. Wie aus Figur 2 deutlich zu erkennen ist, trennt der erste Dichtsitz 19 den in einem Ringspalt 47 zwischen Führungsbohrung 9 und erster Düsennadel 7 unter hohem Druck stehenden Kraftstoff von den ersten Spritzlöchern 23, wenn die Einspritzdüse geschlossen ist. Bei dem Ausführungsbeispiel gemäß Figur 2 sind zwei erste Spritzlöcher 23 dargestellt, die einander gegenüberliegen. Es ist jedoch auch möglich erfindungsgemäße Einspritzdüsen mit einer anderen Zahl von ersten Spritzlöchern 23 oder zweiten Spritzlöchern 49 auszustatten.In Figure 2, the tip of an injection nozzle according to the invention is shown enlarged. The first sealing cone 21 of the first nozzle needle 7 and the corresponding counterpart in the nozzle body 1 are designed so that there is a line contact. This contact line is referred to as the first sealing seat 19 and is shown in Figure 2 as a dashed line. As can be clearly seen from FIG. 2, the first sealing seat 19 separates the fuel, which is under high pressure in an annular gap 47 between guide bore 9 and first nozzle needle 7, from the first spray holes 23 when the injection nozzle is closed. In the embodiment of Figure 2, two first injection holes 23 are shown, which are opposite to each other. However, it is also possible to equip injectors according to the invention with a different number of first spray holes 23 or second spray holes 49.

Etwas weiter in Richtung der Spitze des Düsenkörpers 1 sind zwei zweite Spritzlöcher 49 dargestellt. Die zweiten Spritzlöcher 49 werden von einem zweiten Dichtkonus 51 und dem entsprechenden Gegenstück des Düsenkörpers 1 abgedichtet. Auch hier ergibt sich wieder eine linienförmige Berührungsfläche zwischen zweitem Dichtkonus 51 und dem Düsenkörper 1, die nachfolgend als zweiter Dichtsitz 53 bezeichnet wird.Slightly further in the direction of the tip of the nozzle body 1, two second injection holes 49 are shown. The second injection holes 49 are sealed by a second sealing cone 51 and the corresponding counterpart of the nozzle body 1. Again, there is again a line-shaped contact surface between the second sealing cone 51 and the nozzle body 1, which is referred to below as the second sealing seat 53.

Nachfolgend wird die Funktionsweise der erfindungsgemäßen Einspritzdüse beschrieben, wobei zwischen Figur 1 und 2 hin- und hergewechselt wird.The operation of the injection nozzle according to the invention will be described below, being switched between FIGS. 1 and 2.

Wenn das nicht dargestellte Kraftstoffhochdrucksystem, welches u. a. eine Kraftstoffhochdruckpumpe aufweist, Kraftstoff mit hohem Druck über den Hochdruckzulauf 15 in den Druckraum 11 fördert, hebt die erste Düsennadel 7 vom ersten Dichtsitz 19 ab, sobald die vom Kraftstoff im Druckraum 11 auf die Druckschulter 13 ausgeübte Druckkraft größer ist als die Schließkraft der ersten Düsenfeder 17. Wenn nun die erste Düsennadel 7 vom ersten Dichtsitz 19 abgehoben hat, kann der Kraftstoff aus dem Druckraum 11 über den Ringspalt 47 durch die ersten Spritzlöcher-23 in den nicht dargestellten Brennraum strömen. In manchen Betriebspunkten der nicht dargestellten Brennkraftmaschine ist die Einspritzung optimal, wenn der Kraftstoff ausschließlich durch die ersten Spritzlöcher 23 eingespritzt wird.If the high-pressure fuel system, not shown, which u. a. having a high-pressure fuel pump, promotes fuel at high pressure via the high-pressure inlet 15 into the pressure chamber 11, lifts the first nozzle needle 7 from the first sealing seat 19 as soon as the force exerted by the fuel in the pressure chamber 11 on the pressure shoulder 13 pressure force is greater than the closing force of the first nozzle spring 17. Now, when the first nozzle needle 7 has lifted from the first sealing seat 19, the fuel from the pressure chamber 11 can flow through the annular gap 47 through the first injection holes-23 in the combustion chamber, not shown. In some operating points of the internal combustion engine, not shown, the injection is optimal when the fuel is injected exclusively through the first injection holes 23.

Wenn die Öffnungsquerschnitte der ersten Spritzlöcher 23 nicht ausreichen, um genügend Kraftstoff in der verfügbaren Zeit in die Brennräume einzuspritzen, kann zusätzlich noch die zweite Düsennadel 27 geöffnet werden. Dies geschieht dadurch, dass der Druck im Steuerraum 37 abgesenkt wird. Da der zweite Dichtsitz 53 einen kleineren Durchmesser wie die zweite Düsennadel 27 hat, übt der unter hohem Druck stehende Kraftstoff, welcher aus dem Ringspalt 47 in Richtung erster Spritzlöcher 23 strömt, auf eine Ringfläche 55 der zweiten Düsennadel 27 eine der Schließkraft entgegengerichtete Kraft aus. Die Ringfläche 27 wird vom zweiten Dichtsitz 53 und dem Außendurchmesser der zweiten Düsennadel 27 begrenzt. Sobald diese Kraft größer ist als die Schließkraft bestehend aus der Federkraft der zweiten Düsenfeder 35 und der Druckkraft des im Steuerraum 37 befindlichen Hydraulikfluids, hebt auch die zweite Düsennadel 27 vom Düsenkörper 1 ab und gibt somit die zweiten Spritzlöcher 49 frei. In diesem Zustand können große Kraftstoffmengen in kurzer Zeit durch die ersten Spritzlöcher 23 und die zweiten Spritzlöcher 49 in den nicht dargestellten Brennraum strömen.
Wenn der Druck im Steuerraum 37 zeitlich verzögert zum Öffnen der ersten Düsennadel 7 abgesenkt wird, kann ein Einspritzverlauf geformt werden. In einer ersten Phase, wenn nur die erste Düsennadel 7 geöffnet ist, strömt wenig Kraftstoff durch die ersten Spritzlöcher 23. Mit dem Öffnen der zweiten Düsennadel 27 nimmt die pro Zeiteinheit eingespritzte Kraftstoffmenge stark zu.If the opening cross sections of the first injection holes 23 are not sufficient to inject sufficient fuel into the combustion chambers in the available time, the second nozzle needle 27 can additionally be opened. This happens because the pressure in the control chamber 37 is lowered. Since the second sealing seat 53 has a smaller diameter than the second nozzle needle 27, the fuel under high pressure, which flows out of the annular gap 47 in the direction of the first injection holes 23, exerts an opposing force on an annular surface 55 of the second nozzle needle 27. The annular surface 27 is bounded by the second sealing seat 53 and the outer diameter of the second nozzle needle 27. As soon as this force is greater than the closing force consisting of the spring force of the second nozzle spring 35 and the pressure force of the located in the control chamber 37 hydraulic fluid, also lifts the second Nozzle needle 27 from the nozzle body 1 and thus gives the second injection holes 49 free. In this state, large amounts of fuel can flow in a short time through the first injection holes 23 and the second injection holes 49 in the combustion chamber, not shown.
If the pressure in the control chamber 37 is lowered in time to open the first nozzle needle 7, an injection course can be formed. In a first phase, when only the first nozzle needle 7 is opened, little fuel flows through the first injection holes 23. With the opening of the second nozzle needle 27, the amount of fuel injected per unit time increases sharply.

In Fig. 3 ist ein zweites Ausführungsbeispiel einer nicht erfindungsgemäßen Einspritzdüse dargestellt. Wegen der Übereinstimmungen mit dem ersten Ausführungsbeispiel hinsichtlich Bauteilen und Funktion wird auf das betreffend Fig. und 2 Gesagte verwiesen und nachfolgend lediglich die Unterschiede erläutert.In Fig. 3, a second embodiment of a non-injection nozzle according to the invention is shown. Because of the correspondence with the first embodiment with regard to components and function, reference is made to what has been said with respect to FIGS. 2 and 2 and only the differences are explained below.

Bei dem Ausführungsbeispiel gemäß Fig. 2 ist die zweite Düsennadel 27 auf Höhe des Druckbolzens 18 geteilt. Der obere Teil 27b der zweiten Düsennadel 27 hat beim Durchgang durch den Druckbolzen 18 einen kleineren Durchmesser als der untere Teil 27a der zweiten Düsennadel 27. Eine Mittenbohrung 57 des Druckbolzens, welche den oberen Teil 27b der zweiten Düsennadel 27 führt, hat auch einen kleineren Durchmesser als der untere Teil 27a der zweiten Düsennadel 27. Deshalb bildet das in Fig. 3 untere Ende 59 des Druckbolzens 18 einen Hubanschlag für die Düsennadel 27. Wegen des im Vergleich zum ersten Ausführungsbeispiel kürzeren Abstands von zweitem Dichtsitz (siehe Fig. 2) und dem durch das untere Ende 59 des Druckbolzens 18 gebildeten Hubanschlag läßt sich erstens der Hub der Düsennadel präziser einstellen und zweitens ist gewährleistet, dass
der Hub der zweiten Düsennadel 27 vom Hub der ersten Düsennadel 7 abhängt. Der Hub der zweiten Düsennadel 27 kann maxinal um das in Fig. 3 mit 61 bezeichnete Hubspiel größer als der Hub der ersten Düsennadel 7 sein.In the embodiment according to FIG. 2, the second nozzle needle 27 is divided at the level of the pressure pin 18. The upper part 27b of the second nozzle needle 27 has a smaller diameter when passing through the pressure pin 18 than the lower part 27a of the second nozzle needle 27. A center bore 57 of the pressure pin which guides the upper part 27b of the second nozzle needle 27 also has a smaller diameter Therefore, the lower in Fig. 3 end 59 of the pressure pin 18 forms a stroke stop for the nozzle needle 27. Because of the shorter compared to the first embodiment, the second seal seat (see Fig. 2) and the The stroke stop formed by the lower end 59 of the pressure pin 18 can firstly adjust the stroke of the nozzle needle more precisely and secondly it is ensured that
the stroke of the second nozzle needle 27 depends on the stroke of the first nozzle needle 7. The stroke of the second nozzle needle 27 may be greater than the stroke of the first nozzle needle 7 at the maximum in the stroke play designated 61 in FIG.

Wenn die erste Düsennadel 7 schließt, schließt der Druckbolzen 18 um das Hubspiel 61 versetzt auch die zweite Düsennadel 27. Dadurch werden Nachspritzer aus den zweiten Spritzlöchern 49 (siehe Fig. 2) in den Brennraum (nicht dargestellt) verhindert.When the first nozzle needle 7 closes, the pressure pin 18 also displaces the second nozzle needle 27 by the stroke clearance 61. As a result, after-splashes from the second spray holes 49 (see FIG. 2) into the combustion chamber (not shown) are prevented.

Es hat sich als vorteilhaft herausgestellt, wenn die Summe der Öffnungsquerschnitte der ersten Spritzlöcher 23 in etwa gleich der Summe der Öffnungsquerschnitte der zweiten Spritzlöcher 49 ist.It has proven to be advantageous if the sum of the opening cross sections of the first injection holes 23 is approximately equal to the sum of the opening cross sections of the second injection holes 49.

Claims (13)

  1. Injection nozzle for internal combustion engines, having a nozzle body (1), which nozzle body (1) has at least one first spray hole (23) and at least one second spray hole (49), having a first nozzle needle (7) which is guided in a guide bore (9) of the nozzle body (1) and is embodied as a hollow needle, having a second nozzle needle (27) which is arranged coaxially with respect to the first nozzle needle (7), having a control piston (31) which is guided in the guide bore (9), delimits a control space (37) and transmits the pressure force which results from the control pressure in the control space (37) to the second nozzle needle (27), it being possible to control the injection of fuel through the at least one first spray hole (23) by means of the first nozzle needle (7), and it being possible to control the injection of fuel through the at least one second spray hole (49) by means of the second nozzle needle (27), having a guide sleeve (29) which is arranged in the guide bore (9), the control piston (31) being guided in the guide sleeve (29), and it being possible to exert a pressure force on the second nozzle needle (27) in the closing direction of the second nozzle needle (27) by means of a hydraulic fluid situated in the control space (37), characterized in that the guide sleeve (29) serves as a stroke stop for the second nozzle needle (27), and in that a second nozzle spring (35) is arranged between the control piston (31) and one end (33) of the guide bore (9).
  2. Injection nozzle according to Claim 1, characterized in that the nozzle body (1) has a pressure space (11), of which one end is delimited by a pressure shoulder (13) of the first nozzle needle (7), in that the first nozzle needle (7) has a first sealing cone (21) which interacts with a first sealing seat (19) of the nozzle body (1), in that the second nozzle needle (27) has a second sealing cone (51) which interacts with a second sealing seat (53) of the nozzle body (1), and in that a first nozzle spring (17) is provided which rests at one end against the nozzle body (1) and at the other end against the first nozzle needle (7).
  3. Injection nozzle according to Claim 1 or 2, characterized in that the control space (37) is arranged in the nozzle body (1), and in that a second nozzle spring (35) is provided which acts on the second nozzle needle (27).
  4. Injection nozzle according to one of the preceding claims, characterized in that the nozzle body (1) is of multi-part design and has both an intermediate ring (3) and a nozzle holding body (5).
  5. Injection nozzle according to Claim 4, characterized in that the intermediate ring (3) serves as a stroke stop for the first nozzle needle (7).
  6. Injection nozzle according to one of the preceding claims, characterized in that the first nozzle spring (17) rests against the nozzle body (5) directly or at least indirectly via the guide sleeve (29).
  7. Injection nozzle according to one of the preceding claims, characterized in that the first nozzle spring (17) rests against the guide sleeve (29), or against the nozzle body (5), via a positioning disc (45).
  8. Injection nozzle according to one of the preceding claims, characterized in that a pressure bolt (18) is provided between the first nozzle spring (17) and the first nozzle needle (7), and in that the pressure bolt (18) transmits the closing force of the first nozzle spring (17) to the first nozzle needle (7).
  9. Injection nozzle according to one of the preceding claims, characterized in that the pressure bolt (18) serves as a stroke stop for the second nozzle needle (27).
  10. Injection nozzle according to one of the preceding claims, characterized in that the pressure bolt (18) is guided by the nozzle body (1), in particular by the intermediate ring (3) of the nozzle body (1).
  11. Injection nozzle according to one of the preceding claims, characterized in that the pressure bolt (18) at least partially assumes the function of guiding the second nozzle needle (27).
  12. Injection nozzle according to one of the preceding claims, characterized in that the second nozzle needle (27) is of two-part (27a, 27b) design.
  13. Injection nozzle according to one of the preceding claims, characterized in that the cross-sections of the one or more first spray holes (23) and the cross-sections of the one or more second spray holes (49) are of equal size.
EP01997634A 2000-11-22 2001-11-17 Injection nozzle comprising two separately controllable nozzle needles Expired - Lifetime EP1339966B1 (en)

Applications Claiming Priority (3)

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DE2000158153 DE10058153A1 (en) 2000-11-22 2000-11-22 Injection nozzle with separately controllable nozzle needles
DE10058153 2000-11-22
PCT/DE2001/004338 WO2002042631A1 (en) 2000-11-22 2001-11-17 Injection nozzle comprising two separately controllable nozzle needles

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EP1339966A1 EP1339966A1 (en) 2003-09-03
EP1339966B1 true EP1339966B1 (en) 2006-06-14

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CZ (1) CZ298453B6 (en)
DE (2) DE10058153A1 (en)
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PL355415A1 (en) 2004-04-19
CZ20031313A3 (en) 2004-09-15
EP1339966A1 (en) 2003-09-03
WO2002042631A1 (en) 2002-05-30
DE50110179D1 (en) 2006-07-27
DE10058153A1 (en) 2002-06-06
CZ298453B6 (en) 2007-10-10

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