EP0568845A1 - Fuel injector for internal combustion engines - Google Patents

Fuel injector for internal combustion engines Download PDF

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Publication number
EP0568845A1
EP0568845A1 EP93106121A EP93106121A EP0568845A1 EP 0568845 A1 EP0568845 A1 EP 0568845A1 EP 93106121 A EP93106121 A EP 93106121A EP 93106121 A EP93106121 A EP 93106121A EP 0568845 A1 EP0568845 A1 EP 0568845A1
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EP
European Patent Office
Prior art keywords
valve needle
closing spring
pressure
disc
shoulder
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.)
Ceased
Application number
EP93106121A
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German (de)
French (fr)
Inventor
Karl Dipl.-Ing. Hofmann (Fh)
Werner Dipl.-Ing. Wagner (Ba)
Willi Dipl.-Ing. Frank (Fh)
Klaus Dahlmeier
Klaus Dipl.-Ing. Wolf
Wilhelm Dipl.-Ing. Christ
Helmut Dipl.-Ing. Fleischmann (Fh)
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0568845A1 publication Critical patent/EP0568845A1/en
Ceased legal-status Critical Current

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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
    • F02M45/083—Having two or more closing springs acting on injection-valve

Definitions

  • the invention relates to a fuel injection nozzle for the pre and main injection in internal combustion engines according to the preamble of claim 1.
  • the first closing spring acts via the pressure pin and the second closing spring via the pressure piece, directly or via the intermediate member, on the valve needle.
  • the intermediate member has a collar which comes into contact with the pressure piece assigned to the second closing spring.
  • the intermediate member is designed as a flat disk with a uniform circumference and is guided circumferentially in the recess of the intermediate disk.
  • a disc which can be produced cost-effectively as a stamped part, the end faces of which are ground plane-parallel in a simple manner, can be used in various thicknesses as an adjusting disc for setting the advance stroke of the nozzle needle, the parallelism and plan accuracy of the end faces being very high given the small thickness.
  • this part can be used as an adjusting disc for the second opening pressure.
  • this opening pressure can be adjusted without having to dismantle the closing springs.
  • FIG. 1 and FIG. 2 show the two exemplary embodiments in longitudinal section, and are explained in the following description.
  • the two exemplary embodiments according to FIGS. 1 and 2 are used for pre-injection at a first opening pressure and for main injection at a second opening pressure in a diesel internal combustion engine.
  • the two exemplary embodiments differ essentially in the arrangement of two closing springs 11, 12 which determine the opening pressures in a nozzle holder 10, to which a nozzle body 15 is clamped with a union nut 13 via an intermediate disk 14.
  • a valve needle 16 is slidably mounted in the nozzle body 15 and cooperates with an inwardly directed valve seat 17 in the nozzle body 10, which has one or more spray openings 18.
  • the guide bore of the valve needle 16 is expanded at one point to a pressure chamber 19, in the area of which the valve needle 16 has a pressure shoulder 21 and which is connected via a channel 22 to a nozzle 23 on the nozzle holder 10 for connecting a fuel delivery line.
  • the fuel acting on the pressure shoulder 21 of the valve needle 16 pushes the valve needle 16 upward against the graduated force curve of the arrangement of the closing springs 11 and 12 described below, the fuel being in a pre-injection phase determined by the first closing spring 11 and in one of the two closing springs 11. 12 determined main injection phase is sprayed through the spray openings 18 into the combustion chamber.
  • the two closing springs 11, 12 are arranged radially one inside the other in a stepped chamber 25 in the nozzle holder 10.
  • the inner, first closing spring 11 is supported on the one hand by a washer 26 on the base 27 of the chamber 25 and on the other hand on a pressure bolt 28 which guides the first closing spring 11 with a pin 29 and the second closing spring 12 with its jacket.
  • the outer, second closing spring 12 is supported on the one hand by a washer 31 on a shoulder 32 of the chamber 25 and on the other hand by a pressure piece 33 surrounding the pressure bolt 28 on a shoulder 34 formed by the intermediate washer 14.
  • the two closing springs 11, 12 are arranged axially one behind the other in an elongated chamber 35 in the nozzle holder 10, which is divided by an intermediate floor 41.
  • the first closing spring 11, which is remote from the nozzle body 15, is supported on the one hand by a disk 36 on the base 37 of the chamber 35 and on the other hand by means of a pressure piece 39 on a pin-like pressure bolt 38 which passes through the intermediate floor 41 of the chamber 35 and the second closing spring 12.
  • the second closing spring 12 is supported on the one hand on the fixed intermediate floor 41 and on the other hand via a pressure piece 43 surrounding the pressure bolt 38 on a shoulder 44 formed by the intermediate disk 14.
  • the lower end 46 of the pressure bolt 28 and 38 acts continuously on an intermediate member 50 which is supported on an end pin 51 of the valve needle 16 which projects into the intermediate disk 14.
  • This intermediate member 50 which preferably has the shape of a flat cylinder, is axially displaceably guided in a bore 52 in the intermediate disk 14 with its circumference 53 with the required play. It is preferable a stamped disc with two plane-parallel ground, completely flat end faces 54, 55.
  • the thickness of the intermediate member 50 is dimensioned such that its upper end face 54 in the closed position of the valve needle 16 by the amount h v under the shoulder 34 or 44 of the intermediate disc 14 or which lies on this supporting pressure piece 33, 43.
  • the forward stroke h v of the valve needle 16 can be easily adjusted by the appropriate choice of an intermediate member 50 with the required thickness. Intermediate links with different thicknesses are provided for this purpose.
  • the intermediate member 50 abuts the pressure piece 33 and 43, respectively, after which both closing springs 11 and 12 form a pressure stage on the valve needle 16 Act.
  • the total stroke h g of the valve needle 16 is, as is known, limited by the annular shoulder 56 of the valve needle 16 formed at the transition to the end pin 51 and the lower end face of the intermediate disk 12.
  • the pressure level which forms the opening pressure for the main injection and which is dependent on the pretension of the second closing spring 12, can be set by the choice of the thickness of the pressure piece 33 or 43.
  • the pressure piece 33 or 43 is designed as an annular disk with two plane-parallel end faces 58, 59. It can be produced in a simple manner by punching and surface grinding the end faces 58, 59 and is stored in various thicknesses for setting the pressure level.
  • the pressure piece 33 or 43 designed as an annular disk is guided with its circumference in the chamber 25 or 35 accommodating the second closing spring 12 and itself guides the pressure bolt 28 or 38 with the circumference of its opening.
  • the pressure piece 33 or 43, with which the pressure stage of the injection nozzle is set, and the intermediate member 50, with which the advance stroke h v of the valve needle 16 is set, can be arranged in the region of the interface between the nozzle holder 10 and the intermediate disk 14 the setting of the forward stroke and the pressure stage can be carried out without the closing springs 11, 12 having to be dismantled.
  • the end pin supporting the intermediate member can be omitted, and that the intermediate member passes through the intermediate disk and is guided axially displaceably by the latter.

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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

The fuel injection nozzle for pilot and main injection has a nozzle holder (10), in which two closing springs (11, 12) are coaxially arranged, of which the one acts constantly by way of a central pressure spindle (28) on the valve needle (16) and the other by way of a thrust piece (33) enclosing the pressure spindle only after an initial lift (hv) of the valve needle (16). Between the valve needle (16) and the pressure spindle (28) an intermediate member (50) designed as a disc (50) is arranged, the outer edge area of which, following the initial lift (hv) of the valve needle (16) comes to bear on the thrust piece (33), which in the closing position of the valve needle is supported by a shoulder (43). <IMAGE>

Description

Die Erfindung betrifft eine Kraftstoffeinspritzdüse für die Vor- und Haupteinspritzung bei Brennkraftmaschinen nach der Gattung des Anspruchs 1. Bei bekannten Einspritzdüsen dieser Gattung wirkt die erste Schließfeder über den Druckbolzen und die zweite Schließfeder über das Druckstück, direkt beziehungsweise über das Zwischenglied, auf die Ventilnadel. Bei einer anderen Ausführungsform hat das Zwischenglied einen Bund, der an dem der zweiten Schließfeder zugeordneten Druckstrück zur Anlage kommt.The invention relates to a fuel injection nozzle for the pre and main injection in internal combustion engines according to the preamble of claim 1. In known injection nozzles of this type, the first closing spring acts via the pressure pin and the second closing spring via the pressure piece, directly or via the intermediate member, on the valve needle. In another embodiment, the intermediate member has a collar which comes into contact with the pressure piece assigned to the second closing spring.

Eine besonders einfache Ausführung ergibt sich, wenn gemäß dem kennzeichnenden Teil des Anspruchs 1 das Zwischenglied als flache Scheibe mit gleichförmigem Umfang ausgebildet und in der Ausnehmung der Zwischenscheibe umfangsseitig geführt ist. Eine solche als Stanzteil kostengünstig herstellbare Scheibe, deren Stirnseiten in einfacher Weise planparallel geschliffen sind, kann in verschiedenen Dicken gestuft als Einstellscheibe für das Einstellen des Vorhubs der Düsennadel verwendet werden, wobei bei der geringen Dicke die Parallelität und Plangenauigkeit der Stirnseiten sehr hoch ist.A particularly simple embodiment results if, according to the characterizing part of claim 1, the intermediate member is designed as a flat disk with a uniform circumference and is guided circumferentially in the recess of the intermediate disk. Such a disc, which can be produced cost-effectively as a stamped part, the end faces of which are ground plane-parallel in a simple manner, can be used in various thicknesses as an adjusting disc for setting the advance stroke of the nozzle needle, the parallelism and plan accuracy of the end faces being very high given the small thickness.

Wenn außerdem gemäß Anspruch 3 das die zweite Schließfeder abfangende Druckglied, an dem das Zwischenglied nach Zurücklegung des Vorhubs zur Anlage kommt, ebenfalls zwei planparallele Stirnflächen hat, kann dieses Teil als Einstellscheibe für den zweiten Öffnungsdruck benutzt werden. Außerdem kann dieser Öffnungsdruck eingestellt werden, ohne daß die Schließfedern zu demontieren sind.If, in addition, the pressure element intercepting the second closing spring, on which the intermediate element comes to rest after the advance stroke has come to rest, also has two plane-parallel end faces, this part can be used as an adjusting disc for the second opening pressure. In addition, this opening pressure can be adjusted without having to dismantle the closing springs.

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt, in der die Figur 1 und die Figur 2 die beiden Ausführungsbeispiele im Längsschnitt zeigen, und in der nachfolgenden Beschreibung erläutert.Two exemplary embodiments of the invention are shown in the drawing, in which FIG. 1 and FIG. 2 show the two exemplary embodiments in longitudinal section, and are explained in the following description.

Die beiden Ausführungsbeispiele nach den Figuren 1 und 2 dienen zur Voreinspritzung bei einem ersten Öffnungsdruck und zur Haupteinspritzung bei einem zweiten Öffnungsdruck bei einer Diesel-Brennkraftmaschine. Die beiden Ausführungsbeispiele unterscheiden sich im wesentlichen durch die Anordnung von zwei die Öffnungsdrücke bestimmenden Schließfedern 11, 12 in einem Düsenhalter 10, an dem mit einer Überwurfmutter 13 über eine Zwischenscheibe 14 ein Düsenkörper 15 festgespannt ist. Im Düsenkörper 15 ist eine Ventilnadel 16 verschiebbar gelagert, die mit einem nach innen gekehrten Ventilsitz 17 im Düsenkörper 10 zusammenarbeitet, der eine oder mehrere Spritzöffnungen 18 aufweist. Die Führungsbohrung der Ventilnadel 16 ist wie üblich an einer Stelle zu einem Druckraum 19 erweitert, in dessen Bereich die Ventilnadel 16 eine Druckschulter 21 hat und der über einen Kanal 22 mit einem Stutzen 23 am Düsenhalter 10 zum Anschließen einer Kraftstoff-Förderleitung verbunden ist. Der an der Druckschulter 21 der Ventilnadel 16 angreifende Kraftstoff schiebt die Ventilnadel 16 entgegen dem abgestuften Kraftverlauf der im folgenden beschriebenen Anordnung der Schließfedern 11 und 12 nach oben, wobei der Kraftstoff in einer von der ersten Schließfeder 11 bestimmten Voreinspritzphase und einer von beiden Schließfedern 11, 12 bestimmten Haupteinspritzphase durch die Spritzöffnungen 18 in den Brennraum ausgespritzt wird.The two exemplary embodiments according to FIGS. 1 and 2 are used for pre-injection at a first opening pressure and for main injection at a second opening pressure in a diesel internal combustion engine. The two exemplary embodiments differ essentially in the arrangement of two closing springs 11, 12 which determine the opening pressures in a nozzle holder 10, to which a nozzle body 15 is clamped with a union nut 13 via an intermediate disk 14. A valve needle 16 is slidably mounted in the nozzle body 15 and cooperates with an inwardly directed valve seat 17 in the nozzle body 10, which has one or more spray openings 18. As usual, the guide bore of the valve needle 16 is expanded at one point to a pressure chamber 19, in the area of which the valve needle 16 has a pressure shoulder 21 and which is connected via a channel 22 to a nozzle 23 on the nozzle holder 10 for connecting a fuel delivery line. The fuel acting on the pressure shoulder 21 of the valve needle 16 pushes the valve needle 16 upward against the graduated force curve of the arrangement of the closing springs 11 and 12 described below, the fuel being in a pre-injection phase determined by the first closing spring 11 and in one of the two closing springs 11. 12 determined main injection phase is sprayed through the spray openings 18 into the combustion chamber.

Im Ausführungsbeispiel nach Figur 1 sind die beiden Schließfedern 11, 12 radial ineinander in einer gestuften Kammer 25 im Düsenhalter 10 angeordnet. Die innere, erste Schließfeder 11 stützt sich einerseits über eine Scheibe 26 am Grund 27 der Kammer 25 und andererseits an einem Druckbolzen 28 ab, der mit einem Zapfen 29 die erste Schließfeder 11 und mit seinem Mantel die zweite Schließfeder 12 führt. Die äußere, zweite Schließfeder 12 stützt sich einerseits über eine Scheibe 31 an einer Schulter 32 der Kammer 25 und andererseits über ein den Druckbolzen 28 umgebendes Druckstück 33 an einer von der Zwischenscheibe 14 gebildeten Schulter 34 ab.In the exemplary embodiment according to FIG. 1, the two closing springs 11, 12 are arranged radially one inside the other in a stepped chamber 25 in the nozzle holder 10. The inner, first closing spring 11 is supported on the one hand by a washer 26 on the base 27 of the chamber 25 and on the other hand on a pressure bolt 28 which guides the first closing spring 11 with a pin 29 and the second closing spring 12 with its jacket. The outer, second closing spring 12 is supported on the one hand by a washer 31 on a shoulder 32 of the chamber 25 and on the other hand by a pressure piece 33 surrounding the pressure bolt 28 on a shoulder 34 formed by the intermediate washer 14.

Beim zweiten Ausführungsbeispiel sind die beiden Schließfedern 11, 12 axial hintereinander in einer länglichen Kammer 35 im Düsenhalter 10 angeordnet, die durch einen Zwischenboden 41 unterteilt ist. Die erste, vom Düsenkörper 15 ferne Schließfeder 11 stützt sich einerseits über eine Scheibe 36 am Grund 37 der Kammer 35 und andererseits über ein Druckstück 39 auf einem stiftartigen Druckbolzen 38 ab, der den Zwischenboden 41 der Kammer 35 und die zweite Schließfeder 12 durchsetzt. Die zweite Schließfeder 12 stützt sich einerseits am ortsfesten Zwischenboden 41 und andererseits über ein den Druckbolzen 38 umgebendes Druckstück 43 an einer von der Zwischenscheibe 14 gebildeten Schulter 44 ab.In the second exemplary embodiment, the two closing springs 11, 12 are arranged axially one behind the other in an elongated chamber 35 in the nozzle holder 10, which is divided by an intermediate floor 41. The first closing spring 11, which is remote from the nozzle body 15, is supported on the one hand by a disk 36 on the base 37 of the chamber 35 and on the other hand by means of a pressure piece 39 on a pin-like pressure bolt 38 which passes through the intermediate floor 41 of the chamber 35 and the second closing spring 12. The second closing spring 12 is supported on the one hand on the fixed intermediate floor 41 and on the other hand via a pressure piece 43 surrounding the pressure bolt 38 on a shoulder 44 formed by the intermediate disk 14.

Bei beiden Ausführungsbeispielen wirkt das eben ausgebildete untere Ende 46 des Druckbolzens 28 bzw. 38 dauernd auf ein Zwischenglied 50, das sich auf einem in die Zwischenscheibe 14 ragenden Stirnzapfen 51 der Ventilnadel 16 abstützt. Dieses Zwischenglied 50, das vorzugsweise die Form eines Flachzylinders hat, ist in einer Bohrung 52 in der Zwischenscheibe 14 mit seinem Umfang 53 mit dem erforderlichen Bewegungsspiel axial verschiebbar geführt. Es ist vorzugsweise eine gestanzte Scheibe mit zwei planparallel geschliffenen, vollständig ebenen Stirnseiten 54, 55. Die Dicke des Zwischenglieds 50 ist so bemessen, daß dessen obere Stirnseite 54 in Schließstellung der Ventilnadel 16 um das Maß hv unter der Schulter 34 bzw. 44 der Zwischenscheibe 14 bzw. des sich auf dieser abstützenden Druckstücks 33, 43 liegt. Der Vorhub hv der Ventilnadel 16 kann durch die entsprechende Wahl eines Zwischenglieds 50 mit der erforderlichen Dicke leicht eingestellt werden. Dazu werden Zwischenglieder mit verschiedenen Dicken bereitgestellt.In both exemplary embodiments, the lower end 46 of the pressure bolt 28 and 38, which has just been formed, acts continuously on an intermediate member 50 which is supported on an end pin 51 of the valve needle 16 which projects into the intermediate disk 14. This intermediate member 50, which preferably has the shape of a flat cylinder, is axially displaceably guided in a bore 52 in the intermediate disk 14 with its circumference 53 with the required play. It is preferable a stamped disc with two plane-parallel ground, completely flat end faces 54, 55. The thickness of the intermediate member 50 is dimensioned such that its upper end face 54 in the closed position of the valve needle 16 by the amount h v under the shoulder 34 or 44 of the intermediate disc 14 or which lies on this supporting pressure piece 33, 43. The forward stroke h v of the valve needle 16 can be easily adjusted by the appropriate choice of an intermediate member 50 with the required thickness. Intermediate links with different thicknesses are provided for this purpose.

Beim Öffnungshub der Ventilnadel 16, bei dem zunächst der Vorhub hv unter der Wirkung nur der ersten Schließfeder 11 zurückgelegt wird, stößt das Zwischenglied 50 an das Druckstück 33 bzw. 43 an, wonach beide Schließfedern 11 und 12 auf die Ventilnadel 16 eine Druckstufe bildend wirken. Der Gesamthub hg der Ventilnadel 16 wird wie bekannt durch die am Übergang zum Stirnzapfen 51 gebildete Ringschulter 56 der Ventilnadel 16 und die untere Stirnseite der Zwischenscheibe 12 begrenzt.During the opening stroke of the valve needle 16, in which the preliminary stroke h v is initially covered under the action of only the first closing spring 11, the intermediate member 50 abuts the pressure piece 33 and 43, respectively, after which both closing springs 11 and 12 form a pressure stage on the valve needle 16 Act. The total stroke h g of the valve needle 16 is, as is known, limited by the annular shoulder 56 of the valve needle 16 formed at the transition to the end pin 51 and the lower end face of the intermediate disk 12.

Die Druckstufe, die den Öffnungsdruck für die Haupteinspritzung bildet und die von der Vorspannung der zweiten Schließfeder 12 abhängig ist, kann durch die Wahl der Dicke des Druckstücks 33 bzw. 43 eingestellt werden. Dazu ist das Druckstück 33 bzw. 43 als Ringscheibe mit zwei planparallelen Stirnflächen 58,59 ausgebildet. Es kann in einfacher Weise durch Stanzen und Planschleifen der Stirnflächen 58, 59 hergestellt werden und wird in verschiedenen Dicken zur Einstellung der Druckstufe bevorratet. Das als Ringscheibe ausgebildete Druckstück 33 bzw. 43 ist mit seinem Umfang in der die zweite Schließfeder 12 aufnehmenden Kammer 25 bzw. 35 geführt und führt selber mit dem Umfang seines Durchbruchs den Druckbolzen 28 bzw. 38.The pressure level, which forms the opening pressure for the main injection and which is dependent on the pretension of the second closing spring 12, can be set by the choice of the thickness of the pressure piece 33 or 43. For this purpose, the pressure piece 33 or 43 is designed as an annular disk with two plane-parallel end faces 58, 59. It can be produced in a simple manner by punching and surface grinding the end faces 58, 59 and is stored in various thicknesses for setting the pressure level. The pressure piece 33 or 43 designed as an annular disk is guided with its circumference in the chamber 25 or 35 accommodating the second closing spring 12 and itself guides the pressure bolt 28 or 38 with the circumference of its opening.

Da das Druckstück 33 bzw. 43, mit dem die Druckstufe der Einspritzdüse eingestellt wird, und das Zwischenglied 50, mit dem der Vorhub hv der Ventilnadel 16 eingestellt wird, im Bereich der Nahtstelle zwischen dem Düsenhalter 10 und der Zwischenscheibe 14 angeordnet sind, kann das Einstellen des Vorhubs und der Druckstufe vorgenommen werden, ohne daß die Schließfedern 11, 12 zu demontieren sind.Since the pressure piece 33 or 43, with which the pressure stage of the injection nozzle is set, and the intermediate member 50, with which the advance stroke h v of the valve needle 16 is set, can be arranged in the region of the interface between the nozzle holder 10 and the intermediate disk 14 the setting of the forward stroke and the pressure stage can be carried out without the closing springs 11, 12 having to be dismantled.

Abschließend ist zu bemerken, daß bei einer Ventilnadel mit großem Außendurchmesser der das Zwischenglied abstützende Stirnzapfen entfallen kann, und daß das Zwischenglied die Zwischenscheibe durchsetzt und von dieser axial verschiebbar geführt ist.In conclusion, it should be noted that in the case of a valve needle with a large outer diameter, the end pin supporting the intermediate member can be omitted, and that the intermediate member passes through the intermediate disk and is guided axially displaceably by the latter.

Claims (4)

Kraftstoffeinspritzdüse für die Vor- und Haupteinspritzung bei Brennkraftmaschinen, mit einem Düsenkörper, in welchem eine Ventilnadel verschiebbar gelagert ist und welcher über eine Zwischenscheibe an einem Düsenhalter festgespannt ist, in welchem eine Kammer zur Aufnahme von zwei koaxial angeordneten Schließfedern gebildet ist, von denen die erste Schließfeder über einen zentralen Druckbolzen ständig auf die Ventilnadel einwirkt und die zweite Schließfeder an einem den Druckbolzen umgebenden Druckstück angreift, welches in Schließlage der Ventilnadel an einer an der Zwischenscheibe gebildeten ersten Schulter abgefangen ist und an welchem ein mit der Ventilnadel in einer Ausnehmung in der Zwischenscheibe verschiebbares Zwischenglied nach Zurücklegen eines Vorhubs zur Anlage kommt, und ferner mit einer zweiten Schulter an der Zwischenscheibe, welche im Zusammenwirken mit einer Gegenschulter an der Ventilnadel den Gesamthub der Ventilnadel begrenzt, dadurch gekennzeichnet, daß das Zwischenglied (50) als Scheibe mit gleichförmigem Umfang ausgebildet und in der Ausnehmung (52) der Zwischenscheibe (14) umfangsseitig geführt ist.Fuel injection nozzle for the pre and main injection in internal combustion engines, with a nozzle body in which a valve needle is slidably mounted and which is clamped via an intermediate plate to a nozzle holder, in which a chamber for receiving two coaxially arranged closing springs is formed, the first of which Closing spring constantly acts on the valve needle via a central pressure pin and the second closing spring engages on a pressure piece surrounding the pressure pin, which is intercepted in the closed position of the valve needle on a first shoulder formed on the intermediate disk and on which one with the valve needle in a recess in the intermediate disk displaceable intermediate member comes after a forward stroke comes to rest, and also with a second shoulder on the intermediate disc, which, in cooperation with a counter shoulder on the valve needle, limits the total stroke of the valve needle, characterized in that that the intermediate member (50) is designed as a disc with a uniform circumference and is guided on the circumferential side in the recess (52) of the intermediate disc (14). Kraftstoffeinspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß das Zwischenglied (50) als flacher Zylinder geformt ist.Fuel injection nozzle according to Claim 1, characterized in that the intermediate member (50) is shaped as a flat cylinder. Kraftstoffeinspritzdüse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das die zweite Schließfeder (12) abfangende und an der ersten Schulter (34) an der Zwischenscheibe (14) anliegende Druckstück (33, 43) als Einstellscheibe mit zwei planparallelen Stirnflächen (58, 59) ausgebildet ist.Fuel injection nozzle according to Claim 1 or 2, characterized in that the pressure piece (33, 43) which intercepts the second closing spring (12) and is in contact with the first shoulder (34) on the intermediate disc (14) as an adjusting disc with two plane-parallel end faces (58, 59 ) is trained. Kraftstoffeinspritzdüse nach Anspruch 3, dadurch gekennzeichnet, daß das Druckstück (33, 43) in der die zweite Schließfeder (12) aufnehmenden Kammer (25, 35) umfangsseitig geführt ist und einen die erste Schließfeder (11) abstützenden Druckbolzen (28, 38) führend umgibt.Fuel injection nozzle according to Claim 3, characterized in that the pressure piece (33, 43) is guided circumferentially in the chamber (25, 35) receiving the second closing spring (12) and guides a pressure bolt (28, 38) supporting the first closing spring (11) surrounds.
EP93106121A 1992-05-02 1993-04-15 Fuel injector for internal combustion engines Ceased EP0568845A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9205975U DE9205975U1 (en) 1992-05-02 1992-05-02 Fuel injection nozzle for internal combustion engines
DE9205975U 1992-05-02

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EP0568845A1 true EP0568845A1 (en) 1993-11-10

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EP93106121A Ceased EP0568845A1 (en) 1992-05-02 1993-04-15 Fuel injector for internal combustion engines

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JP (1) JPH0626417A (en)
DE (1) DE9205975U1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340874A1 (en) * 1993-12-01 1995-06-08 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
FR2726862A1 (en) * 1994-11-10 1996-05-15 Bosch Gmbh Robert INJECTOR FOR INTERNAL COMBUSTION ENGINE
EP1072788A2 (en) * 1999-07-30 2001-01-31 Delphi Technologies, Inc. Method of forming a chamber in a workpiece
EP1116879A3 (en) * 2000-01-14 2003-10-15 Delphi Technologies, Inc. Spring seat

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026572B (en) * 1956-11-16 1958-03-20 Friedmann & Maier Ag Injection nozzle for internal combustion engines
GB2093118A (en) * 1981-02-17 1982-08-25 Bosch Gmbh Robert Fuel injection nozzle
EP0475843B1 (en) * 1990-09-12 1995-06-21 Nissan Motor Co., Ltd. Direct injection diesel engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026572B (en) * 1956-11-16 1958-03-20 Friedmann & Maier Ag Injection nozzle for internal combustion engines
DE1041299B (en) * 1956-11-16 1958-10-16 Friedmann & Maier Ag Injection nozzle for internal combustion engines
GB2093118A (en) * 1981-02-17 1982-08-25 Bosch Gmbh Robert Fuel injection nozzle
EP0475843B1 (en) * 1990-09-12 1995-06-21 Nissan Motor Co., Ltd. Direct injection diesel engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340874A1 (en) * 1993-12-01 1995-06-08 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
FR2726862A1 (en) * 1994-11-10 1996-05-15 Bosch Gmbh Robert INJECTOR FOR INTERNAL COMBUSTION ENGINE
US5727738A (en) * 1994-11-10 1998-03-17 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
EP1072788A2 (en) * 1999-07-30 2001-01-31 Delphi Technologies, Inc. Method of forming a chamber in a workpiece
EP1072788A3 (en) * 1999-07-30 2002-07-03 Delphi Technologies, Inc. Method of forming a chamber in a workpiece
EP1116879A3 (en) * 2000-01-14 2003-10-15 Delphi Technologies, Inc. Spring seat

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JPH0626417A (en) 1994-02-01
DE9205975U1 (en) 1993-09-09

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