EP0282480A1 - Fuel injection nozzle for internal combustion engines. - Google Patents

Fuel injection nozzle for internal combustion engines.

Info

Publication number
EP0282480A1
EP0282480A1 EP86906291A EP86906291A EP0282480A1 EP 0282480 A1 EP0282480 A1 EP 0282480A1 EP 86906291 A EP86906291 A EP 86906291A EP 86906291 A EP86906291 A EP 86906291A EP 0282480 A1 EP0282480 A1 EP 0282480A1
Authority
EP
European Patent Office
Prior art keywords
valve needle
stroke
shoulder
nozzle body
injection nozzle
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.)
Granted
Application number
EP86906291A
Other languages
German (de)
French (fr)
Other versions
EP0282480B1 (en
Inventor
Max Straubel
Ewald Eblen
Paul Fussner
Gunter Kapolke
Edgar Schneider
Klaus Wolf
Werner Wagner
Karl Hofmann
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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0282480A1 publication Critical patent/EP0282480A1/en
Application granted granted Critical
Publication of EP0282480B1 publication Critical patent/EP0282480B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the shoulders limiting the forward stroke of the valve needle are formed on the pressure pin of the first closing spring and on the pressure piece of the second closing spring.
  • the tolerance range of the advance stroke is determined by manufacturing tolerances on the nozzle body and the valve needle, as well as on the pressure pin and the intermediate washer, so that it is necessary to adjust the advance stroke by adjusting the pressure pin. Due to the large number of individual manufacturing tolerances and deformation during assembly, the pre-stroke tolerance can, however, only be achieved in a relatively large range, e.g. B. 0.05 mm, which is too large for some applications. In the case of very small forward strokes, as are required for direct-injection engines, the tolerance range of the forward stroke must be significantly smaller than the fourth specified above, for example. Advantages of the invention
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the tolerance range of the advance stroke is determined solely by manufacturing tolerances on the nozzle body and the nozzle needle.
  • the forward stroke can therefore be measured precisely and adjusted by grinding the valve needle.
  • dimensional tolerances or changes in other parts that occur during operation or during assembly no longer affect the size of the forward stroke.
  • the total stroke of the valve needle can be easily adjusted if the intermediate disk is formed from two individual disks, of which the one lying against the nozzle body has a larger diameter 3 hole than the other, and if the shoulder formed on the intermediate disk to limit the total stroke of the valve needle that not covered by a single pane
  • the total stroke is determined by the wall thickness of the individual disc determined, so that only a single disc of appropriate wall thickness must be provided to obtain the desired total stroke.
  • the intermediate bushing can expediently be guided on a pressure socket of the valve needle, which also results in guidance of the pressure bolt of the first closing spring.
  • it can also be advantageous to design the valve needle without a pressure plug and to guide the intermediate bushing in the intermediate disk. With this arrangement, the end face of the valve needle can be machined particularly easily and, furthermore, pressure pin breaks on the valve needle are avoided.
  • the injection nozzle according to FIG. 1 has a nozzle body it, which, together with an intermediate disk 12, is clamped to a holding body 10 by a union nut 14.
  • a valve needle 1S is slidably mounted in the nozzle body 10 and cooperates with a valve seat in the nozzle body 10 which is turned inward and which is arranged in front of a plurality of spray openings 20.
  • the leading The bore of the valve needle 18 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 18 has a pressure shoulder and which is connected via a channel 22 to a connecting piece 24 on the holding body 16 for connecting a fuel delivery line.
  • the fuel engaging the pressure shoulder of the valve needle 18 pushes the valve needle 18 upward against the graduated force curve of a closing spring arrangement described below, the fuel being sprayed out through the injection openings 20 in a pre-injection phase and a main injection phase.
  • a first chamber 26 is formed for receiving a first closing spring 28, which is supported by a washer 30 on the bottom of the chamber 26 and acts continuously on the valve needle 18 via a pressure piece 32 and a pressure pin 34.
  • the chamber 26 merges at a housing shoulder 36 into a second chamber 38, in which a second closing spring 40 is arranged, which surrounds the pressure bolt 34.
  • the closing spring 40 is supported on the housing shoulder 36 by means of disks 42, 44 and engages on a pressure piece 46 which is slidably mounted on the pressure pin 34.
  • the pressure piece 46 is supported via an intermediate bushing 48, which is designed as a separate part, on an area 50 (FIG. 2) of the upper end face 52 of the nozzle body 10 which is not covered by the intermediate disk 12.
  • the chambers 26 and 38 are connected via a channel 56 to a connection nipple 58 for a leak oil line.
  • the valve needle 18 guides one during the injection process
  • Valve needle 18 together with intermediate bush 48 moved in the opening direction until it has completed its entire stroke. This is limited and determined by annular shoulders 64, 66 on the intermediate bush 48 and the intermediate disk 12. On the annular shoulder 6h, a section 68 of the intermediate bush 48 with a larger diameter merges into a section 70 with a smaller diameter, which is guided in the intermediate disk 12 and in turn leads the central pressure pin 34.
  • the preliminary stroke h v can easily be measured. This is only the valve needle
  • the desired amount of the preliminary stroke h v can also be produced very precisely. No changes in the preliminary stroke h v occur during assembly and operation of the injection nozzle.
  • a pressure pin 72 is formed on the valve needle 18 ', on which the intermediate bush 48 is guided and via ien the force of the first closing spring 28 on the valve needle 18 'is transmitted.
  • the intermediate disc 12 ' is formed from two individual discs 74, 76, of which the lower one has a larger inner diameter than the upper one.
  • the shoulder for limiting the total stroke of the valve needle 18 ' is formed by the area 66' of the upper individual disk 76 which is not covered by the lower individual disk 74.
  • the overall stroke can also be easily adjusted to the desired value by appropriate selection of the wall thickness of the individual disk 74 become.

Abstract

Injecteur avec une configuration spécifique d'injection. Un premier ressort de fermeture (28) agit constamment sur l'aiguille (18) de soupape par l'intermédiaire d'un axe de pression central (34), et après exécution d'une course préliminaire (hv), un deuxième ressort (40) de fermeture agit au moyen d'un élément de pression (46). Celui-ci est supporté pendant une course préliminaire (hv) au moyen d'un manchon intermédiaire (48) sur le corps (10) d'injecteur. La course préliminaire (hv) est limitée par des épaulements (60, 62) sur l'aiguille de soupape (18) et par le manchon intermédiaire (48). Par contre, la course totale est limitée par des épaulements (64, 66) sur le manchon intermédiaire (48) et le disque intermédiaire (12). De cette manière, la course préliminaire (hv) peut être réglée de façon très précise à une valeur choisie en usinant l'aiguille (18) de soupape et ne change pas lors du montage de l'injecteur.Injector with a specific injection configuration. A first closing spring (28) acts constantly on the valve needle (18) via a central pressure axis (34), and after execution of a preliminary stroke (hv), a second spring ( 40) closure acts by means of a pressure element (46). This is supported during a preliminary stroke (hv) by means of an intermediate sleeve (48) on the injector body (10). The preliminary stroke (hv) is limited by shoulders (60, 62) on the valve needle (18) and by the intermediate sleeve (48). On the other hand, the total stroke is limited by shoulders (64, 66) on the intermediate sleeve (48) and the intermediate disc (12). In this way, the preliminary stroke (hv) can be set very precisely to a value chosen by machining the valve needle (18) and does not change when mounting the injector.

Description

Kraftstoff-Einspritzdüse für BrennkraftmaschinenFuel injection nozzle for internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse nach der Gattung des Hauptanspruchs. Bei bekannten Einspritzdüsen dieser Gattung sind die den Vorhub der Ventilnadel begrenzenden Schultern am Druckbolzen der ersten Schließfeder und am Druckstück der zweiten Schließfeder gebildet. Bei dieser Ausführung wird der Tolerantbereich des Vorhubs durch Fertigungstoleranzen am Düsenkörper und der Ventilnadel, sowie auch am Druckbolzen und der Zwischenscheibe bestimmt, so daß es notwendig ist, den Vorhub durch Anpassen des Druckbolzens einzustellen. Bedingt durch die Vielzahl der einzelnen Fertigungstoleranzen und durch Verformung bei der Montage kann die Vorhub-Toleranz jedoch nur in einem verhältnismäßig großen Bereich von z. B. 0,05 mm eingehalten werden, der für manche Anwendungsfälle zu groß ist. Bei sehr kleinen Vorhüben, wie sie für direkt einspritzende Motoren erforderlich sind, muß der Toleranzbereich des Vorhubes deutlich kleiner als der vorstehend beispielsweise angegebene Viert sein. Vorteile der ErfindungThe invention relates to a fuel injection nozzle according to the preamble of the main claim. In known injection nozzles of this type, the shoulders limiting the forward stroke of the valve needle are formed on the pressure pin of the first closing spring and on the pressure piece of the second closing spring. In this embodiment, the tolerance range of the advance stroke is determined by manufacturing tolerances on the nozzle body and the valve needle, as well as on the pressure pin and the intermediate washer, so that it is necessary to adjust the advance stroke by adjusting the pressure pin. Due to the large number of individual manufacturing tolerances and deformation during assembly, the pre-stroke tolerance can, however, only be achieved in a relatively large range, e.g. B. 0.05 mm, which is too large for some applications. In the case of very small forward strokes, as are required for direct-injection engines, the tolerance range of the forward stroke must be significantly smaller than the fourth specified above, for example. Advantages of the invention
Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Toleranzbereich des Vorhubs allein durch Fertigungstoleranzen am Düsenkörper und der Düsennadel bestimmt wird. Der Vorhub kann daher genau gemessen und durch Anschleifen der Ventilnadel eingestellt werden. Außerdem wirken sich Maßtoleranzen oder im Betrieb bzw. bei der Montage auftretende Veränderungen anderer Teile auf die Größe des Vorhubes nicht mehr aus.The arrangement according to the invention with the characterizing features of the main claim has the advantage that the tolerance range of the advance stroke is determined solely by manufacturing tolerances on the nozzle body and the nozzle needle. The forward stroke can therefore be measured precisely and adjusted by grinding the valve needle. In addition, dimensional tolerances or changes in other parts that occur during operation or during assembly no longer affect the size of the forward stroke.
Durch die in den Unteransprüchen enthaltenen Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach dem Haupt anspruch möglich.The measures contained in the dependent claims advantageous refinements of the arrangement according to the main claim are possible.
Eine besonders einfache und fertigungsgerechte Ausführung ergibt sich, wenn die den Vorhub begrenzende Schulter an der Zwischenbuchse gebildet ist an deren dem Düsenkörper zugekehrten, ebenen Stirnseite, die unter der Einwirkung der zweiten Schließfeder gegen einen von der Zwischenscheibe nicht überdeckten Bereich der oberen, ebenfalls ebenen Stirnseite des Düsenkörpers gedrückt ist.A particularly simple and production-oriented design results if the shoulder limiting the preliminary stroke is formed on the intermediate bush on its flat end face facing the nozzle body, which under the action of the second closing spring against a region of the upper, likewise flat end face not covered by the intermediate disk of the nozzle body is pressed.
Der Gesamthub der Ventilnadel läßt sich einfach einstellen, wenn die Zwischenscheibe aus zwei Einzelschei- ben gebildet ist, von denen die am Düsenkörper anliegende einen größeren 3ohrungsdurchmes ser als die andere hat, und wenn die an der Zwischenscheibe gebildete Schulter zur Begrenzung des Gesamthubes der Ventilnadel an der von der einen Einzelscheibe nicht überdecktenThe total stroke of the valve needle can be easily adjusted if the intermediate disk is formed from two individual disks, of which the one lying against the nozzle body has a larger diameter 3 hole than the other, and if the shoulder formed on the intermediate disk to limit the total stroke of the valve needle that not covered by a single pane
Bereich der Stirnseite der anderen Einzelscheibe gebildet ist. Bei dieser Ausführung wird der Gesamthub durch die Wandstärke der am Düsenkörper anliegenden Einzel- scheibe bestimmt, so daß nur eine Einzelscheibe passender Wandstärke vorgesehen werden muß, um den gewünschten Gesamthub zu erhalten.Area of the end face of the other single disc is formed. In this version, the total stroke is determined by the wall thickness of the individual disc determined, so that only a single disc of appropriate wall thickness must be provided to obtain the desired total stroke.
Die Zwischenbuchse kann zweckmäßig auf einem Drucksapfan der Ventilnadel geführt sein, wodurch sich auch eine Führung des Druckbolzens der ersten Schließfeder ergibt In manchen Fällen kann es jedoch auch vorteilhaft sein, die Ventilnadel ohne Druckzapfen auszuführen und die Zwischenbuchse in der Zwischenscheibe zu führen. Bei dieser Anordnung läßt sich die Stirnseite der Ventilnadel besonders einfach bearbeiten und außerdem werden Druckzapfenbrüche an der Ventilnadel vermieden.The intermediate bushing can expediently be guided on a pressure socket of the valve needle, which also results in guidance of the pressure bolt of the first closing spring. In some cases, however, it can also be advantageous to design the valve needle without a pressure plug and to guide the intermediate bushing in the intermediate disk. With this arrangement, the end face of the valve needle can be machined particularly easily and, furthermore, pressure pin breaks on the valve needle are avoided.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher e rl äut ert . E s z e i gen Fi gur 1 e i ne Kr aft st o f f -E i n spritzdüse im Längsschnitt und Figur 2, linke Hälfte, vergrößert Teile der Einspritzdüse nach Figur 1. In der rechten Hälfte der Figur 2 ist eine Variante zur Ausführung nach Figur 1 dargestellt.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. E s z e i gen Fig. 1 e i ne Kraft sto f f -E i n Injection nozzle in longitudinal section and Figure 2, left half, enlarged parts of the injection nozzle according to Figure 1. In the right half of Figure 2, a variant of the embodiment according to Figure 1 is shown.
Beschreibung des AusführungsbeispielesDescription of the embodiment
Die Einspritzdüse nach Figur 1 hat einen Düsenkörper it, der zusammen mit einer Zwischenscheibe 12 durch eine Überwurfmutter 14 an einem Haltekörper 1o festgespannt ist. Im Düsenkörper 10 ist eine Ventilnadel 1S verschiebbar gelagert, die mit einem nach innen gekehrten Ventilsitz im Düsenkörper 10 zusammenarbeitet, der mehreren Spritzöffnungen 20 vorgelagert ist. Die Füh- rungsbohrung der Ventilnadel 18 ist wie üblich an einer Stelle zu einem Druckraum erweitert, in dessen Bereich die Ventilnadel 18 eine Druckschulter hat und der über einen Kanal 22 mit einem Stutzen 24 am Haltekörper 16 zum Anschließen einer Kraftstoff-Förderleitung verbunden ist. Der an der Druckschulter der Ventilnadel 18 angreifende Kraftstoff schiebt die Ventilnadel 18 entgegen dem abgestuften Kraftverlauf einer im folgenden beschriebenen Schließfederanordnung nach oben, wobei der Kraftstoff in einer Voreinspritzphase und einer Haupteinspritzphase durch die Spritzöffnungen 20 ausgespritzt wird.The injection nozzle according to FIG. 1 has a nozzle body it, which, together with an intermediate disk 12, is clamped to a holding body 10 by a union nut 14. A valve needle 1S is slidably mounted in the nozzle body 10 and cooperates with a valve seat in the nozzle body 10 which is turned inward and which is arranged in front of a plurality of spray openings 20. The leading The bore of the valve needle 18 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 18 has a pressure shoulder and which is connected via a channel 22 to a connecting piece 24 on the holding body 16 for connecting a fuel delivery line. The fuel engaging the pressure shoulder of the valve needle 18 pushes the valve needle 18 upward against the graduated force curve of a closing spring arrangement described below, the fuel being sprayed out through the injection openings 20 in a pre-injection phase and a main injection phase.
Im Haltekörper 16 ist eine erste Kammer 26 zur Aufnahme einer ersten Schließfeder 28 gebildet, die sich über eine Scheibe 30 am Boden der Kammer, 26 abstützt und über ein Druckstück 32 und einen Druckbolzen 34 ständig auf die Ventilnadel 18 einwirkt. Die Kammer 26 geht an einer Gehäuseschulter 36 in eine zweite Kammer 38 über, in welcher eine zweite Schließfeder 40 angeordnet ist, die den Druckbolzen 34 umgibt. Die Schließfeder 40 stützt sich über Scheiben 42, 44 an der Gehäuseschulter 36 ab und greift an einem Druckstück 46 an, welches auf dem Druckbolzen 34 verschiebbar gelagert ist. Das Druckstück 46 stützt sich über eine als getrenntes Teil ausgeführte Zwischenbuchse 48 an einem von der Zwischenscheibe 12 nicht überdeckten Bereich 50 (Figur 2) der oberen Stirnseite 52 des Düsenkörpers 10 ab. Die Kammern 26 und 38 sind über einen Kanal 56 mit einem Anschlußnippel 58 für eine Leckölleitung verbunden. Beim Einspritzvorgang führt die Ventilnadel 18 einenIn the holding body 16, a first chamber 26 is formed for receiving a first closing spring 28, which is supported by a washer 30 on the bottom of the chamber 26 and acts continuously on the valve needle 18 via a pressure piece 32 and a pressure pin 34. The chamber 26 merges at a housing shoulder 36 into a second chamber 38, in which a second closing spring 40 is arranged, which surrounds the pressure bolt 34. The closing spring 40 is supported on the housing shoulder 36 by means of disks 42, 44 and engages on a pressure piece 46 which is slidably mounted on the pressure pin 34. The pressure piece 46 is supported via an intermediate bushing 48, which is designed as a separate part, on an area 50 (FIG. 2) of the upper end face 52 of the nozzle body 10 which is not covered by the intermediate disk 12. The chambers 26 and 38 are connected via a channel 56 to a connection nipple 58 for a leak oil line. The valve needle 18 guides one during the injection process
Vorhub hv aus, bei welchem nur die erste SchließfederForward stroke h v off, in which only the first closing spring
28 als Gegenkraft wirksam ist. Dabei wird ein begrenzte Voreinspritzmenge in den Brennraum der Maschine eingespritzt. Der Vorhub hv ist beendet, wenn die obere28 is effective as a counterforce. A limited amount of pre-injection is injected into the combustion chamber of the machine. The preliminary stroke h v is ended when the upper
Stirnseite 60 der Ventilnadel 18 an der unteren Stirnseite 62 der Zwischenbuchse 48 zur Anlage kommt. In dieser Stellung verharrt die Ventilnadel 18, bis der weiter ansteigende Kraft stoffdruck die Gegenkräfte beider Schließfedern 28 und 40 überwindet. Danach wird dieEnd face 60 of the valve needle 18 comes to rest on the lower end face 62 of the intermediate bush 48. In this position, the valve needle 18 remains until the increasing fuel pressure overcomes the opposing forces of the two closing springs 28 and 40. After that the
/um die Strecke hg / around the distance h g
Ventilnadel 18 samt Zwischenbuchse 48 in Öffnungsrichtung weiterbewegt, bis sie ihren Gesamthub zurückgelegt hat. Dieser ist begrenzt und bestimmt durch Ringschultern 64 , 66 an der Zwischenbuchse 48 und der Zwischenscheibe 12. An der Ringschulter 6h geht ein im Durchmesser größerer Abschnitt 68 der Zwischenbuchse 48 in einen im Durchmesser kleineren Abschnitt 70 über, welcher in der Zwischenscheibe 12 geführt ist und seinerseits den zentralen Druckbolzen 34 führt.Valve needle 18 together with intermediate bush 48 moved in the opening direction until it has completed its entire stroke. This is limited and determined by annular shoulders 64, 66 on the intermediate bush 48 and the intermediate disk 12. On the annular shoulder 6h, a section 68 of the intermediate bush 48 with a larger diameter merges into a section 70 with a smaller diameter, which is guided in the intermediate disk 12 and in turn leads the central pressure pin 34.
Bei der erfindungsgemäßen Einspritzdüse kann der Vorhub hv leicht gemessen werden. Dazu ist nur die VentilnadelWith the injection nozzle according to the invention, the preliminary stroke h v can easily be measured. This is only the valve needle
18 bis zur Anlage am Ventilsitz in den Düsenkörper 10 einzustecken und die Höhendifferenz zwischen der oberen18 to insert into the valve body 10 in the valve seat and the height difference between the upper
Stirnseite 52 des Düsenkörpers 10 und der StirnseiteEnd face 52 of the nozzle body 10 and the end face
60 der Ventilnadel 18 zu ermitteln. Durch Anschleifen der Stirnseite 60 der Ventilnadel 18 kann ferner das gewünschte Maß des Vorhubes hv sehr genau hergestellt werden. Bei der Montage und im Betrieb der Einspritzdüse treten keine Veränderungen des Vorhubes hv auf.60 to determine the valve needle 18. By grinding the end face 60 of the valve needle 18, the desired amount of the preliminary stroke h v can also be produced very precisely. No changes in the preliminary stroke h v occur during assembly and operation of the injection nozzle.
Bei der Variante gemäß Figur 2, rechte zeichnungshälfte, ist an die Ventilnadel 18' ein Druckzapfen 72 angeformt, auf dem die Zwischenbuchse 48 geführt ist und über ien die Kraft der ersten Schließfeder 28 auf die Ventilnadel 18' übertragen wird. Die Zwischenscheibe 12' ist aus zwei Einzelscheiben 74, 76 gebildet, von denen die untere einen größeren Innendurchmesser als die obere hat. Der Schulter zur Begrenzung des Gesamthubes der Ventilnadel 18' ist gebildet durch den von der unteren Einzelscheibe 74 nicht bedeckten Bereich 66' der oberen Einzelscheibe 76. Bei dieser Ausführung kann auch der Gesamthub durch entsprechende Wahl der Wandstärke der Einzelscheibe 74 leicht auf den gewünschten Wert eingestellt werden. In the variant according to FIG. 2, right half of the drawing, a pressure pin 72 is formed on the valve needle 18 ', on which the intermediate bush 48 is guided and via ien the force of the first closing spring 28 on the valve needle 18 'is transmitted. The intermediate disc 12 'is formed from two individual discs 74, 76, of which the lower one has a larger inner diameter than the upper one. The shoulder for limiting the total stroke of the valve needle 18 'is formed by the area 66' of the upper individual disk 76 which is not covered by the lower individual disk 74. In this embodiment, the overall stroke can also be easily adjusted to the desired value by appropriate selection of the wall thickness of the individual disk 74 become.

Claims

Ansprüche Expectations
1. Kraftstoff-Einspritzdüse für Brennkraftmaschinen, mit einem Düsenkörper, in welchem eine Ventilnadel verschiebbar gelagert ist und welcher über eine Zwischenscheibe an einem Düseshalter festgespannt ist, in welchem eine Kammer zur Aufnahme von zwei Schließfedern gebildet ist, von denen die erste über einen zentralen Druckbolzen ständig auf die Ventilnadel einwirkt, wogegen die zweite Schließfeder an einem Druckstück angreift, welches in Schließlage der Ventilnadel an einer gehäusefesten Schulter abgefangen ist und an welchem die Ventilnadel bzw. ein mit ihr bewegtes Teil nach Zurücklegen eines Vorhubes zur Anlage kommt, und ferner mit einer Schulter an der Zwischenscheibe, welche im Zusammenwirken mit einer Gegenschulter, die sich spätestens nach Zurücklegung des Vorhubes mit der Ventilnadel bewegt, den Gesamthub der Ventilnadel begrenzt, dadurch gekennzeichnet, daß das Druckstück (46) der zweiten Schließfeder ( 40 ) auf eine vorzugsweise als ein vom Druckstück (46) getrenntes Bauteil ausgeführte Zwischenbuchse (48) einwirkt, welche die Zwischenscheibe (12) durchsetzt und in Schließlage der Ventilnadel (18) an einer Schulter (50) des Düsenkörpers (10) abgefangen ist, und ferner daß der Yorhub (hv) der Ventilnadel (18) durch ein erstes Schulterpaar (60, 62) an der Ventilnadel (18) und der Zwischenbuchse (48), und der Gesamthub der Ventilnadel (18) durch ein zweites Schulterpaar ( 64 , 66 ) an der Zwischenbuchse (48) und der Zwischenscheibe (12) begrenzt ist.1. Fuel injection nozzle for 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 closing springs is formed, the first of which via a central pressure pin constantly acts on the valve needle, whereas the second closing spring acts on a pressure piece, which in the closed position of the valve needle is intercepted on a shoulder fixed to the housing and on which the valve needle or a part moving with it comes to rest after a forward stroke, and also with one Shoulder on the intermediate disc, which in cooperation with a counter shoulder, which moves after the advance stroke with the valve needle at the latest, limits the total stroke of the valve needle, characterized in that the pressure piece (46) of the second closing spring (40) is preferably a from the pressure piece ( 46) separate component executed intermediate bushing (48) acts, which passes through the washer (12) and is intercepted in the closed position of the valve needle (18) on a shoulder (50) of the nozzle body (10), and further that the Yorhub (h v ) Valve needle (18) by a first pair of shoulders (60, 62) on the valve needle (18) and the Intermediate bushing (48), and the total stroke of the valve needle (18) is limited by a second pair of shoulders (64, 66) on the intermediate bushing (48) and the intermediate disc (12).
2. Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß die den Vorhub (hv) begrenzende Schulter an der Zwischenbuchse ( 48 ) gebildet ist an deren dem Düsenkörper (10) zugekehrten, ebenen Stirnseite (60), die unter der Einwirkung der zweiten Schließfeder (40) gegen einen von der Zwischenscheibe (12) nicht überdeckten Bereich (50) der oberen, ebenfalls ebenen Stirnseite (52) des Düsenkörpers (10) gedrückt ist.2. Injection nozzle according to claim 1, characterized in that the preliminary stroke (h v ) limiting shoulder on the intermediate bush (48) is formed on the nozzle body (10) facing, flat end face (60), under the action of the second closing spring (40) is pressed against an area (50) of the upper, likewise flat end face (52) of the nozzle body (10) which is not covered by the intermediate disk (12).
3. Einspritzdüse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Zwischenscheibe (12', Figur 2, rechts) aus zwei Einzelscheiben ( 74 , 76 ) gebildet ist, von denen die am Düsenkörper (10) anliegende erste (74) einen größeren Bohrungsdurchmesser als die zweite (76) hat und daß die an der Zwischenscheibe (12') gebildete Schulter (66') zur Begrenzung des Gesamthubes an dem von der ersten Einzelscheibe (74) nicht bedeckten Bereich der zweiten Einzelscheibe (76) gebildet ist.3. Injection nozzle according to claim 1 or 2, characterized in that the intermediate disk (12 ', Figure 2, right) is formed from two individual disks (74, 76), of which the first (74) on the nozzle body (10) has a larger one Bore diameter than the second (76) and that the shoulder (66 ') formed on the intermediate disc (12') is formed to limit the total stroke on the area of the second individual disc (76) not covered by the first individual disc (74).
k . Einspritzdüse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Zwischenbuchse ( 48 ) auf einem Druckzapfen (72) der Ventilnadel (18') verschiebbar geführt ist. k. Injection nozzle according to one of Claims 1 to 3, characterized in that the intermediate bush (48) is guided so as to be displaceable on a pressure pin (72) of the valve needle (18 ').
EP86906291A 1985-11-21 1986-11-07 Fuel injection nozzle for internal combustion engines Expired - Lifetime EP0282480B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3541131 1985-11-21
DE3541131 1985-11-21
DE19863610658 DE3610658A1 (en) 1985-11-21 1986-03-29 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3610658 1986-03-29

Publications (2)

Publication Number Publication Date
EP0282480A1 true EP0282480A1 (en) 1988-09-21
EP0282480B1 EP0282480B1 (en) 1990-02-07

Family

ID=25838027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86906291A Expired - Lifetime EP0282480B1 (en) 1985-11-21 1986-11-07 Fuel injection nozzle for internal combustion engines

Country Status (5)

Country Link
US (1) US4768719A (en)
EP (1) EP0282480B1 (en)
JP (1) JP2545523B2 (en)
DE (2) DE3610658A1 (en)
WO (1) WO1987003339A1 (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288207A3 (en) * 1987-04-24 1989-08-09 LUCAS INDUSTRIES public limited company Fuel injection nozzles
GB8711188D0 (en) * 1987-05-12 1987-06-17 Lucas Ind Plc Fuel injection nozzles
JPH081160B2 (en) * 1988-09-19 1996-01-10 株式会社ゼクセル Fuel injection valve
DE3839038A1 (en) * 1988-11-18 1990-05-23 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3839637A1 (en) * 1988-11-24 1990-06-07 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3842335A1 (en) * 1988-12-16 1990-06-21 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3913062A1 (en) * 1989-04-21 1990-10-25 Daimler Benz Ag FUEL INJECTION DEVICE FOR AN AIR COMPRESSING INTERNAL COMBUSTION ENGINE, ESPECIALLY SUCH AS A DIRECT INJECTOR
DE4027493A1 (en) * 1989-09-19 1991-03-28 Avl Verbrennungskraft Messtech Diesel IC engine fuel injection valve - with valve needle operated via pressure slot sliding relative to cooperating hydraulic piston
DE4001103C2 (en) * 1990-01-17 1994-04-28 Daimler Benz Ag Fuel injection valve for air-compressing direct-injection internal combustion engines
DE4005774A1 (en) * 1990-02-23 1991-08-29 Bosch Gmbh Robert IC engine fuel-injection nozzle - has coaxial thrust pins with fingers passing between each other and supporting springs
FR2684416B1 (en) * 1990-01-17 1994-06-03 Daimler Benz Ag FUEL INJECTION VALVE FOR DIRECT INJECTION AND AIR COMPRESSION INTERNAL COMBUSTION ENGINES.
GB9012288D0 (en) * 1990-06-01 1990-07-18 Lucas Ind Plc Fuel injection pump
DE4101235C1 (en) * 1991-01-17 1992-06-04 Robert Bosch Gmbh, 7000 Stuttgart, De
US5211340A (en) * 1991-08-27 1993-05-18 Zexel Corporation Fuel injector
US5205492A (en) * 1991-12-16 1993-04-27 Gregory Khinchuk Fuel injection valve
AT408253B (en) * 1992-03-02 2001-10-25 Avl Verbrennungskraft Messtech Injection nozzle for an internal combustion engine
DE59310268D1 (en) * 1992-12-23 2002-04-11 Ganser Hydromag Ag Zuerich Fuel injector
DE4340874C2 (en) * 1993-12-01 1996-10-24 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
GB9416785D0 (en) * 1994-08-19 1994-10-12 Lucas Ind Plc Fuel injection nozzle
DE4434892A1 (en) * 1994-09-29 1996-04-11 Siemens Ag Injector
DE4440182C2 (en) * 1994-11-10 2003-09-18 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19608608A1 (en) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19638339B4 (en) * 1996-09-19 2008-10-02 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
US5871155A (en) * 1997-06-10 1999-02-16 Caterpillar Inc. Hydraulically-actuated fuel injector with variable rate return spring
DE19907348A1 (en) * 1999-02-20 2000-08-24 Bosch Gmbh Robert Vehicle engine fuel injection valve, with fuel transfer achieved by springs which are stressed by valve member in opening stroke
DE10126954A1 (en) * 2001-06-01 2002-12-12 Bosch Gmbh Robert Injector for injecting fuel under high pressure has biased spring fixed at one end, supported on needle via pressure body at distance from injector housing wall at other to exert closing force
US7942214B2 (en) * 2006-11-16 2011-05-17 Schlumberger Technology Corporation Steerable drilling system
ATE551521T1 (en) * 2008-04-18 2012-04-15 Magneti Marelli Spa FUEL INJECTION NOZZLE WITH DIRECT CLOSURE OPERATION FOR COMBUSTION ENGINES
DE102016213008A1 (en) 2016-07-15 2018-01-18 Bosch Limited Plate spring for a fuel injector
CN107664081A (en) * 2016-07-29 2018-02-06 博世有限公司 Disk spring for fuel injector
US10753493B2 (en) * 2018-03-29 2020-08-25 Hamilton Sunstrand Corporation Valve with segmented spring guide assembly

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH350835A (en) * 1956-11-16 1960-12-15 Friedmann & Maier Ag Injection nozzle for fuel injection engines
DE1284687B (en) * 1967-10-18 1968-12-05 Bosch Gmbh Robert Fuel injection valve for pilot and main injection
DE2711350A1 (en) * 1977-03-16 1978-09-21 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR COMBUSTION MACHINES
DE2711393A1 (en) * 1977-03-16 1978-09-21 Bosch Gmbh Robert FUEL INJECTOR
JPS56173757U (en) * 1980-05-27 1981-12-22
DE3105686A1 (en) * 1981-02-17 1982-09-02 Robert Bosch Gmbh, 7000 Stuttgart "FUEL INJECTION NOZZLE"
GB2128252A (en) * 1982-10-14 1984-04-26 Lucas Ind Plc Fuel injection nozzle
US4566635A (en) * 1983-08-10 1986-01-28 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US4684067A (en) * 1986-03-21 1987-08-04 General Motors Corporation Two-stage, hydraulic-assisted fuel injection nozzle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8703339A1 *

Also Published As

Publication number Publication date
DE3668949D1 (en) 1990-03-15
JP2545523B2 (en) 1996-10-23
EP0282480B1 (en) 1990-02-07
US4768719A (en) 1988-09-06
WO1987003339A1 (en) 1987-06-04
DE3610658A1 (en) 1987-05-27
JPS63502767A (en) 1988-10-13

Similar Documents

Publication Publication Date Title
EP0282480B1 (en) Fuel injection nozzle for internal combustion engines
DE2710216A1 (en) FUEL INJECTOR
WO1998040623A1 (en) Valve for controlling fluids
DE2336575B2 (en) ELECTROMAGNETICALLY CONTROLLED FUEL INJECTOR FOR PISTON ENGINE
EP0516628B1 (en) Fuel-injection valve for internal-combustion engines
EP1775460B1 (en) Fuel injection valve
EP0637686B1 (en) Fuel injection nozzle for internal combustion engines
EP1346143A1 (en) Fuel injection valve for internal combustion engines
DE19936669A1 (en) Common rail injector
EP0240693B1 (en) Fuel injector for internal-combustion engines
EP0444053B1 (en) Fuel injection nozzle for internal combustion engines
DE3843235A1 (en) FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
EP0445126B1 (en) Fuel injection nozzle for internal combustion engines
EP0698182A1 (en) Injection nozzle for internal combustion engines
DE3938551A1 (en) IC engine fuel injection nozzle - has longitudinal groove in needle valve stem, delivering fuel to seat
DE3907569A1 (en) FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
EP0568845A1 (en) Fuel injector for internal combustion engines
WO1987005077A1 (en) Fuel injection nozzle for internal combustion engines
DE3725618C2 (en) Fuel injection nozzle for internal combustion engines
DE19929881A1 (en) Fuel injection valve for internal combustion engines
DE2948840A1 (en) FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3937955A1 (en) Fuel injection nozzle for IC engine - has second closing spring retained in intermediate section of housing
DE3820509A1 (en) Fuel injection nozzle for internal combustion engines
DE3700978A1 (en) Fuel injection nozzle for internal combustion engines
DE3440852A1 (en) FUEL INJECTION NOZZLE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19880416

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17Q First examination report despatched

Effective date: 19881219

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 3668949

Country of ref document: DE

Date of ref document: 19900315

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20050914

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20051024

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20051118

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060127

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20061106

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20