EP0516628B1 - Fuel-injection valve for internal-combustion engines - Google Patents

Fuel-injection valve for internal-combustion engines Download PDF

Info

Publication number
EP0516628B1
EP0516628B1 EP91901693A EP91901693A EP0516628B1 EP 0516628 B1 EP0516628 B1 EP 0516628B1 EP 91901693 A EP91901693 A EP 91901693A EP 91901693 A EP91901693 A EP 91901693A EP 0516628 B1 EP0516628 B1 EP 0516628B1
Authority
EP
European Patent Office
Prior art keywords
spring
fingers
closing
pressure
valve needle
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
EP91901693A
Other languages
German (de)
French (fr)
Other versions
EP0516628A1 (en
Inventor
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 EP0516628A1 publication Critical patent/EP0516628A1/en
Application granted granted Critical
Publication of EP0516628B1 publication Critical patent/EP0516628B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/65—Scarf
    • Y10T403/655—Mirror images

Definitions

  • the invention is based on a fuel injector according to the preamble of claim 1.
  • an injector of this type DE-OS 36 10 658
  • the spring chamber in the nozzle holder accommodates both axially successive closing springs, with the closing spring closer to the valve needle over a disk is supported on an annular shoulder of the spring chamber, so that the chamber is divided into an area with a large diameter and an area with a small diameter.
  • This has the consequence that with a usual standard outer diameter of the nozzle holder of z. B. 17 mm the small diameter is no longer sufficient to accommodate a suitable spring.
  • both closing springs can have the same diameter, but the cross hole for the cross bolt in the housing of the nozzle holder affects its strength and tightness.
  • the injection nozzle according to the invention with the characterizing features of claim 1 has the advantage that the housing of the two-spring nozzle holder with the usual standard outer diameter of z. B. 17 mm can be executed. Furthermore, the spring chamber has a constant diameter over its entire length, which can be kept relatively small. In addition, the assembly of the closing springs and the pressure bolts is very easy.
  • FIG. 1 shows an injection nozzle for a diesel engine in longitudinal section
  • FIG. 2 shows two pressure bolts of the injection nozzle according to FIG. 1 in an exploded view.
  • the injection nozzle has a nozzle body 10 which is clamped together with an intermediate disk 12 with a union nut 14 to a holding body 16.
  • a valve needle 18 is slidably mounted in the nozzle body 10 and cooperates with a valve seat in the nozzle body 10 which is turned inwards and which has a plurality of spray openings 20.
  • the guide bore of the valve needle 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 23 on the holding body 16 for connecting a fuel delivery line.
  • the fuel acting on 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 injected through the injection openings 20 in a pre-injection phase and a main injection phase.
  • a spring chamber 24 is arranged coaxially to the valve needle 18, which is designed as an axial blind bore and is closed at its opening by the intermediate disk 12.
  • a first closing spring 26 and a second closing spring 28 are arranged in a row, which are designed as helical compression springs.
  • the first closing spring 26, which is more distant from the nozzle body 10, constantly acts on the valve needle 18 in its closing direction via a first pressure bolt 30.
  • the first closing spring 26 is supported by a washer 32 on the base 34 of the spring chamber 24 and by another washer 36 on the upper end of the first pressure bolt 30 provided with a head 38, the lower end of which rests on the upper end face of the valve needle 18 .
  • the second closing spring 28, which is constructed identically to the first closing spring 26, is arranged adjacent to the nozzle body 10 in the spring chamber 24 and surrounds the rod-like part 31 of the first pressure bolt 30.
  • the lower closing end of the second closing spring 28 is supported by a spring plate 42 and a washer 44 from an intermediate bush 46 surrounding the upper end portion of the valve needle 18, which is thereby placed in the closed position of the valve needle 18 on the end face of the nozzle body 10. With its other end, it presses via a washer 48 onto the lower end of a second pressure bolt 50, which is designed as a head 52, the rod-shaped part of which passes through the first closing spring 26 and the upper end of which is supported on the upper washer 42 which bears against the base of the spring chamber 24.
  • the heads 38 and 52 of the two coaxially arranged in the spring chamber 24 pressure bolts 30 and 50 are movable with play in the spring chamber 24 and designed so that they reach through each other.
  • they consist of, for example, three claws or fingers 40, 54 which are evenly distributed on a circle coaxial with the axis of the pressure bolts 30, 50 and project axially parallel from the rod-shaped part 31, 51 of the pressure bolts 30, 50.
  • Their radial cross section has the shape of a circular ring segment.
  • the spaces between the individual fingers 40, 54 of each head 38, 52 have the shape of a circular ring segment with approximately the same area as the fingers 40, 54, so that the fingers 40 of one pressure pin 30 in the space between the fingers 52 of the other Pressure pin 50 are displaceable with play and the fingers 40 of the first pressure pin 30 together with the fingers 54 of the second pressure pin 50 form a cylinder ring.
  • the closing springs 26, 28 are supported by the disks 48, 52 as described above on the ends of the fingers 40, 54 which project above the fingers 40, 54 of the other head 38, 52. In the rest position of the nozzle needle 18 and the closing springs 26, 28, the spaced-apart central regions of the two pressure bolts 30, 50 have a distance which is so large that contact is excluded when the nozzle needle 18 is fully open.
  • the spring chamber 24 is connected via a channel 60 to a bore 62 for a connection nipple for a leakage oil line.
  • the passage for leak oil from the spring chamber 24 to the axially opening channel 60 is formed by an oblique bore 56 in the free end part of the rod-shaped part 51 of the second pressure bolt 50, one end of which is coaxial with the hole of the disk 34 abutting in the base of the spring chamber 24 and the other end thereof open in a constriction 58 in the end portion of the rod-shaped part 51.
  • the valve needle 18 performs a preliminary stroke h v , in which only the first closing spring 26 acts as a counterforce.
  • a limited pre-injection quantity is sprayed out of the spray openings 20.
  • the preliminary stroke h v is ended when a stop 64 on the valve needle 18 comes to rest against the counter stop 66 of the intermediate bush 46.
  • the valve needle 18 remains in this position until the further increasing fuel pressure also overcomes the opposing forces of the two closing springs 26, 28. Thereafter, the valve needle 18 together with the intermediate bush 46 is moved further in the opening direction until after a residual stroke h h it has completed its entire stroke.
  • both closing springs 26, 28 with the same outside diameter, supporting the second closing spring 28 by means of a pressure bolt 50 which passes through the first closing spring 26, the diameter of the spring chamber 24 can be kept very small and the injection nozzle can thus be made relatively slim overall.
  • the space of the spring chamber 24 is fully utilized by the rod-shaped part 31, 51 of the two pressure bolts 30, 50.
  • Pressure bolts 30, 50 are also made in two parts, the head 38, 52 being separated from the rod-shaped part 31, 51 and the rod-shaped part being supported in a central indentation on the head.
  • the assembly of the closing spring 26, 28 and the pressure pin 30, 50 is very simple if the pressure pin 30 closer to the nozzle body 10 is formed in two parts.

Landscapes

  • 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 valve proposed has a nozzle jet (10) fixed to a nozzle holder (16) and a valve needle (18) which can move longitudinally in the nozzle jet. The needle (18) is lifted away from a valve seat by the fuel pressure acting against the force produced by a valve-closing spring assembly consisting of two helical compression springs (26, 28) disposed one behind the other, thus injecting fuel. The stroke of the valve needle (18) is made up of a pre-stroke and a residual stroke. In order to produce a fuel-injection valve with the smallest possible outside diameter, the two valve-closing springs have the same outside diameter. The first spring (26), which acts during the pre-stroke, rests against the top (34) of a spring chamber (24) and against a thrust bolt (30) acting on the valve needle (18). The second spring (28), which acts together with the first spring (26) during the residual stroke, also rests, via a second thrust bolt (50) passing through the first spring (26), against the top of the spring chamber, as well as on a longitudinally movable intermediate bushing (46) which rests against the jet nozzle (10). The two thrust bolts (30, 50) have, at the two ends closest to each other, identically shaped heads (38, 52) consisting of claw-like fingers (40, 54), the fingers (40) on one bolt (30) passing between the fingers (54) on the other bolt (50).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse nach der Gattung des Anspruchs 1. Bei einer Einspritzdüse dieser Gattung (DE-OS 36 10 658) nimmt die Federkammer im Düsenhalter beide axial hintereinanderliegende Schließfedern auf, wobei sich die der Ventilnadel näherliegende Schließfeder über eine Scheibe an einer Ringschulter der Federkammer abstützt, so daß die Kammer in einen Bereich mit einem großen und in einen Bereich mit einem kleinen Durchmesser unterteilt ist. Dies hat zur Folge, daß bei einem üblichen Standard-Außendurchmesser des Düsenhalters von z. B. 17 mm der kleine Durchmesser zur Aufnahme einer geeigneten Feder nicht mehr ausreicht.The invention is based on a fuel injector according to the preamble of claim 1. In an injector of this type (DE-OS 36 10 658), the spring chamber in the nozzle holder accommodates both axially successive closing springs, with the closing spring closer to the valve needle over a disk is supported on an annular shoulder of the spring chamber, so that the chamber is divided into an area with a large diameter and an area with a small diameter. This has the consequence that with a usual standard outer diameter of the nozzle holder of z. B. 17 mm the small diameter is no longer sufficient to accommodate a suitable spring.

Um bei Einspritzdüsen der gattungsgemäßen Art eine Vergrößerung des Außendurchmessers gegenüber handelsüblichen Ausführungen zu vermeiden, wird in der nicht vorveröffentlichten DE-Patentanmeldung P 38 39 038 vorgeschlagen, die zur Aufnahme beider Schließfedern dienende Federkammer im Düsenhalter über die gesamte Länge mit gleichem Durchmesser auszuführen und die der Ventilnadel benachbarte Schließfeder an einem die Federkammer durchsetzenden Querbolzen abzustützen. Bei dieser Ausführungsform können beide Schließfedern den gleichen Durchmesser haben, die Querbohrung für den Querbolzen im Gehäuse des Düsenhalters beeinträchtigt jedoch dessen Festigkeit und die Dichtigkeit.In order to avoid an enlargement of the outer diameter compared to commercially available designs in the case of injection nozzles of the generic type, it is proposed in the unpublished DE patent application P 38 39 038 that the spring chamber serving to receive both closing springs be designed in the nozzle holder over the entire length with the same diameter and that To support the valve needle adjacent closing spring on a cross bolt passing through the spring chamber. In this embodiment, both closing springs can have the same diameter, but the cross hole for the cross bolt in the housing of the nozzle holder affects its strength and tightness.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Einspritzdüse mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß das Gehäuse des Zweifeder-Düsenhalters mit dem üblichen Standard-Außendurchmesser von z. B. 17 mm ausgeführt werden kann. Ferner hat die Federkammer einen über ihre gesamte Länge konstanten Durchmesser, der relativ klein gehalten werden kann. Außerdem ist die Montage der Schließfedern und der Druckbolzen sehr einfach.The injection nozzle according to the invention with the characterizing features of claim 1 has the advantage that the housing of the two-spring nozzle holder with the usual standard outer diameter of z. B. 17 mm can be executed. Furthermore, the spring chamber has a constant diameter over its entire length, which can be kept relatively small. In addition, the assembly of the closing springs and the pressure bolts is very easy.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Einspritzdüse möglich. Eine einfache und rationelle Fertigung der klauenartigen Finger ist möglich, wenn diese einen ringsegmentförmigen Querschnitt aufweisen, der bei den Fingern beider Köpfe gleich ist. Die Einstellung des Öffnungsdruckes der Einspritzdüse ist besonders einfach, wenn der der Ventilnadel naheliegende Druckbolzen zweiteilig als glätter Bolzen mit getrenntem Kopfteil ausgebildet ist.Advantageous further developments and improvements of the injection nozzle specified in claim 1 are possible through the measures listed in the subclaims. A simple and rational production of the claw-like fingers is possible if they have an annular segment-shaped cross section, which is the same for the fingers of both heads. The setting of the opening pressure of the injection nozzle is particularly simple if the pressure pin close to the valve needle is constructed in two parts as a smooth pin with a separate head part.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Einspritzdüse für einen Dieselmotor im Längsschnitt und Figur 2 zwei Druckbolzen der Einspritzdüse nach Figur 1 in Explosionsdarstellung.An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. FIG. 1 shows an injection nozzle for a diesel engine in longitudinal section and FIG. 2 shows two pressure bolts of the injection nozzle according to FIG. 1 in an exploded view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einspritzdüse hat einen Düsenkörper 10, der zusammen mit einer Zwischenscheibe 12 mit einer Überwurfmutter 14 an einem Haltekörper 16 festgespannt ist. Im Düsenkörper 10 ist eine Ventilnadel 18 verschiebbar gelagert, die mit einem nach innen gekehrten Ventilsitz im Düsenkörper 10 zusammenarbeitet, der mehrere Spritzöffnungen 20 aufweist. Die Führungsbohrung der Ventilnadel 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 23 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 has a nozzle body 10 which is clamped together with an intermediate disk 12 with a union nut 14 to a holding body 16. A valve needle 18 is slidably mounted in the nozzle body 10 and cooperates with a valve seat in the nozzle body 10 which is turned inwards and which has a plurality of spray openings 20. The guide bore of the valve needle 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 23 on the holding body 16 for connecting a fuel delivery line. The fuel acting on 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 injected through the injection openings 20 in a pre-injection phase and a main injection phase.

Im Haltekörper 16 ist eine Federkammer 24 koaxial zur Ventilnadel 18 angeordnet, die als axiale Sackbohrung ausgebildet und an ihrer Öffnung von der Zwischenscheibe 12 abgeschlossen ist. In der Federkammer 24 sind eine erste Schließfeder 26 und eine zweite Schließfeder 28 hintereinander gereiht angeordnet, die als Schraubendruckfedern ausgebildet sind. Die vom Düsenkörper 10 entferntere erste Schließfeder 26 wirkt über einen ersten Druckbolzen 30 ständig auf die Ventilnadel 18 in deren Schließrichtung. Hierzu stützt sich die erste Schließfeder 26 über eine Scheibe 32 am Grund 34 der Federkammer 24 und über eine andere Scheibe 36 am oberen mit einem Kopf 38 versehenen Ende des ersten Druckbolzens 30 ab, der mit seinem unteren Ende an der oberen Stirnseite der Ventilnadel 18 anliegt.In the holding body 16, a spring chamber 24 is arranged coaxially to the valve needle 18, which is designed as an axial blind bore and is closed at its opening by the intermediate disk 12. In the spring chamber 24, a first closing spring 26 and a second closing spring 28 are arranged in a row, which are designed as helical compression springs. The first closing spring 26, which is more distant from the nozzle body 10, constantly acts on the valve needle 18 in its closing direction via a first pressure bolt 30. For this purpose, the first closing spring 26 is supported by a washer 32 on the base 34 of the spring chamber 24 and by another washer 36 on the upper end of the first pressure bolt 30 provided with a head 38, the lower end of which rests on the upper end face of the valve needle 18 .

Die zur ersten Schließfeder 26 baugleich ausgeführte zweite Schließfeder 28 ist in der Federkammer 24 dem Düsenkörper 10 benachbart angeordnet und umgibt den stangenartigen Teil 31 des ersten Druckbolzens 30. Mit ihrem unteren Stirnende stützt sich die zweite Schließfeder 28 über einen Federteller 42 und eine Scheibe 44 auf einer den oberen Endabschnitt der Ventilnadel 18 umgebenden Zwischenbuchse 46 ab, die dadurch in Schließlage der Ventilnadel 18 an die Stirnseite des Düsenkörpers 10 angelegt wird. Mit ihrem anderen Ende drückt sie über eine Scheibe 48 auf das untere als Kopf 52 ausgebildete Ende eines zweiten Druckbolzens 50, dessen stangenförmiger Teil die erste Schließfeder 26 durchsetzt und dessen oberes Ende sich an der oberen, am Grund der Federkammer 24 anliegenden Scheibe 42 abstützt.The second closing spring 28, which is constructed identically to the first closing spring 26, is arranged adjacent to the nozzle body 10 in the spring chamber 24 and surrounds the rod-like part 31 of the first pressure bolt 30. The lower closing end of the second closing spring 28 is supported by a spring plate 42 and a washer 44 from an intermediate bush 46 surrounding the upper end portion of the valve needle 18, which is thereby placed in the closed position of the valve needle 18 on the end face of the nozzle body 10. With its other end, it presses via a washer 48 onto the lower end of a second pressure bolt 50, which is designed as a head 52, the rod-shaped part of which passes through the first closing spring 26 and the upper end of which is supported on the upper washer 42 which bears against the base of the spring chamber 24.

Die Köpfe 38 und 52 der beiden gleichachsig in der Federkammer 24 angeordneten Druckbolzen 30 und 50 sind mit Spiel in der Federkammer 24 verschiebbar und so ausgebildet, daß sie einander durchgreifen. Dazu bestehen sie aus beispielsweise jeweils drei Klauen oder Fingern 40, 54 die auf einem zur Achse der Druckbolzen 30, 50 gleichachsigen Kreis gleichmäßig verteilt sind und achsparallel vom stangenförmigen Teil 31, 51 der Druckbolzen 30, 50 vorstehen. Ihr radialer Querschnitt hat die Form eines Kreisringsegments. In gleicher Weise haben die Zwischenräume zwischen den einzelnen Fingern 40, 54 jedes Kopfes 38, 52 die Form eines Kreisringsegments mit angenähert gleicher Fläche wie die Finger 40, 54, so daß die Finger 40 des einen Druckbolzens 30 im Zwischenraum zwischen den Fingern 52 des anderen Druckbolzens 50 mit Spiel verschiebbar sind und die Finger 40 des ersten Druckbolzens 30 zusammen mit den Fingern 54 des zweiten Druckbolzens 50 einen Zylinderring bilden. An den die Finger 40, 54 des anderen Kopfes 38, 52 jeweils überragenden Stirnenden der Finger 40, 54 stützen sich die Schließfedern 26, 28 über die Scheiben 48, 52 wie oben beschrieben ab. In Ruhestellung der Düsennadel 18 und der Schließfedern 26, 28 haben die zueinander beabstandeten mittleren Bereiche der beiden Druckbolzen 30, 50 einen Abstand, der so groß ist, daß bei voll geöffneter Düsennadel 18 eine Berührung ausgeschlossen ist.The heads 38 and 52 of the two coaxially arranged in the spring chamber 24 pressure bolts 30 and 50 are movable with play in the spring chamber 24 and designed so that they reach through each other. For this purpose, they consist of, for example, three claws or fingers 40, 54 which are evenly distributed on a circle coaxial with the axis of the pressure bolts 30, 50 and project axially parallel from the rod-shaped part 31, 51 of the pressure bolts 30, 50. Their radial cross section has the shape of a circular ring segment. In the same way, the spaces between the individual fingers 40, 54 of each head 38, 52 have the shape of a circular ring segment with approximately the same area as the fingers 40, 54, so that the fingers 40 of one pressure pin 30 in the space between the fingers 52 of the other Pressure pin 50 are displaceable with play and the fingers 40 of the first pressure pin 30 together with the fingers 54 of the second pressure pin 50 form a cylinder ring. The closing springs 26, 28 are supported by the disks 48, 52 as described above on the ends of the fingers 40, 54 which project above the fingers 40, 54 of the other head 38, 52. In the rest position of the nozzle needle 18 and the closing springs 26, 28, the spaced-apart central regions of the two pressure bolts 30, 50 have a distance which is so large that contact is excluded when the nozzle needle 18 is fully open.

Zum Rückführen von Lecköl ist die Federkammer 24 über einen Kanal 60 mit einer Bohrung 62 für einen Anschlußnippel für eine Leckölleitung verbunden. Den Durchgang für Lecköl aus der Federkammer 24 zu dem axial einmündenden Kanal 60 bildet eine Schrägbohrung 56 im freien Endteil des stangenförmigen Teils 51 des zweiten Druckbolzens 50, deren eines Ende koaxial mit dem Loch der im Grund der Federkammer 24 anliegenden Scheibe 34 und deren anderes Ende in einer Einschnürung 58 im Endabschnitt des stangenförmigen Teils 51 münden.To return leakage oil, the spring chamber 24 is connected via a channel 60 to a bore 62 for a connection nipple for a leakage oil line. The passage for leak oil from the spring chamber 24 to the axially opening channel 60 is formed by an oblique bore 56 in the free end part of the rod-shaped part 51 of the second pressure bolt 50, one end of which is coaxial with the hole of the disk 34 abutting in the base of the spring chamber 24 and the other end thereof open in a constriction 58 in the end portion of the rod-shaped part 51.

Beim Einspritzvorgang führt die Ventilnadel 18 einen Vorhub hv aus, bei welchem nur die erste Schließfeder 26 als Gegenkraft wirksam ist. Bei diesem Vorhub hv wird eine begrenzte Voreinspritzmenge aus den Spritzöffnungen 20 ausgespritzt. Der Vorhub hv ist beendet, wenn ein Anschlag 64 an der Ventilnadel 18 an dem Gegenanschlag 66 der Zwischenbuchse 46 zur Anlage kommt. In dieser Stellung verharrt die Ventilnadel 18, bis der weiter ansteigende Kraftstoffdruck auch die Gegenkräfte beider Schließfedern 26, 28 überwindet. Danach wird die Ventilnadel 18 samt Zwischenbuchse 46 in Öffnungsrichtung weiter bewegt, bis sie nach einem Resthub hh ihren Ge-samthub zurückgelegt hat. Dieser ist begrenzt durch den Gegenanschlag 68 an der Zwischenscheibe 12, an der der Anschlag 70 an der Zwischenbuchse 46 anschlägt. Durch die Ausführung beider Schließfedern 26, 28 mit gleichem Außendurchmesser, die Abstützung der zweiten Schließfeder 28 über einen Druckbolzen 50, der die erste Schließfeder 26 durchsetzt kann der Durchmesser der Federkammer 24 sehr klein gehalten und damit die Einspritzdüse insgesamt relativ schlank gemacht werden. Außerdem wird durch den stangenförmigen Teil 31, 51 der beiden Druckbolzen 30, 50 der Raum der Federkammer 24 voll ausgenutzt.During the injection process, the valve needle 18 performs a preliminary stroke h v , in which only the first closing spring 26 acts as a counterforce. During this preliminary stroke h v , a limited pre-injection quantity is sprayed out of the spray openings 20. The preliminary stroke h v is ended when a stop 64 on the valve needle 18 comes to rest against the counter stop 66 of the intermediate bush 46. The valve needle 18 remains in this position until the further increasing fuel pressure also overcomes the opposing forces of the two closing springs 26, 28. Thereafter, the valve needle 18 together with the intermediate bush 46 is moved further in the opening direction until after a residual stroke h h it has completed its entire stroke. This is limited by the counter stop 68 on the intermediate disk 12, on which the stop 70 strikes the intermediate bush 46. By designing both closing springs 26, 28 with the same outside diameter, supporting the second closing spring 28 by means of a pressure bolt 50 which passes through the first closing spring 26, the diameter of the spring chamber 24 can be kept very small and the injection nozzle can thus be made relatively slim overall. In addition, the space of the spring chamber 24 is fully utilized by the rod-shaped part 31, 51 of the two pressure bolts 30, 50.

Die Erfindung ist nicht auf das beschriebene und dargestellte Ausführungsbeispiel beschränkt. Alternativ können eine oder beide Druckbolzen 30, 50 auch zweiteilig ausgeführt werden, wobei jeweils der Kopf 38, 52 vom stangenförmigen Teil 31, 51 getrennt ist und sich der stangenförmige Teil in einer zentrischen Einbuchtung am Kopf abstützt. Insbesondere ist die Montage der Schließfeder 26, 28 und der Druckbolzen 30, 50 sehr einfach, wenn der dem Düsenkörper 10 näherliegende Druckbolzen 30 zweiteilig ausgebildet ist. Bei weiteren Variationen in der Gestaltung der Druckbolzen ist wesentlich, daß die Köpfe der Druckbolzen einander durchdringen, so daß eine getrennte Wirkung der Schließfedern vorhanden ist.The invention is not restricted to the exemplary embodiment described and illustrated. Alternatively, one or both Pressure bolts 30, 50 are also made in two parts, the head 38, 52 being separated from the rod-shaped part 31, 51 and the rod-shaped part being supported in a central indentation on the head. In particular, the assembly of the closing spring 26, 28 and the pressure pin 30, 50 is very simple if the pressure pin 30 closer to the nozzle body 10 is formed in two parts. In the case of further variations in the design of the pressure bolts, it is essential that the heads of the pressure bolts penetrate one another, so that the closing springs have a separate effect.

Claims (5)

  1. Fuel injection nozzle for internal combustion engines, having a nozzle body (10) displaceably supporting a valve needle (18) and having a nozzle holder (16) connected to the nozzle body, which nozzle holder contains a spring chamber (24) for accommodating two closing springs (26, 28) configured as helical compression springs, arranged one behind the other and acting sequentially on the valve needle (18), of which closing springs (26, 28) the first closing spring (26) more remote from the nozzle body (10) is supported at the end of the spring chamber (24) and acts on the valve needle (18) via a pressure pin (30) passing through the second closing spring (28), and of which closing springs, the second closing spring (28) nearer to the nozzle body (10) is supported at the casing end and acts on the valve needle (18) via a pressure element (46), characterized in that the second closing spring (28) is supported at the base (34) of the spring chamber (24) via a second pressure pin (50) passing through the first closing spring (26) and arranged on the same axis as the first pressure pin (30), and in that the ends of the two pressure pins (30, 50) facing towards one another carry mutually penetrating heads (38, 52), each of the heads (38, 52) having fingers (40, 54) extending in the direction of the pressure pins (30, 50), which fingers are arranged alternately adjacent to one another and on which the closing springs (26, 28) are supported.
  2. Fuel injection nozzle according to Claim 1, characterized in that the heads (38, 52) of the two pressure pins (30, 50) are configured with the same shape.
  3. Fuel injection nozzle according to Claim 2, characterized in that the fingers (40, 54) of the heads (38, 52) of the pressure pins (30, 50) have a cross-section in the shape of an annular segment and in that the fingers (40) of the first pressure pin (30) with the fingers (54) of the second pressure pin (50) complement each other to form a cylindrical ring [sic].
  4. Fuel injection nozzle according to one of Claims 1 to 3, characterized in that the closing springs (26, 28) are supported on one disc each (36, 48) on the fingers (40, 54).
  5. Fuel injection nozzle according to one of Claims 1 to 4, characterized in that the head (38, 52) with the fingers (40, 54) of the pressure pins (30, 50) is configured as a part separate from the rod-shaped part (31, 51).
EP91901693A 1990-02-23 1991-01-17 Fuel-injection valve for internal-combustion engines Expired - Lifetime EP0516628B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4005774A DE4005774A1 (en) 1990-02-23 1990-02-23 IC engine fuel-injection nozzle - has coaxial thrust pins with fingers passing between each other and supporting springs
DE4005774 1990-02-23
PCT/DE1991/000027 WO1991014092A1 (en) 1990-02-23 1991-01-17 Fuel-injection valve for internal-combustion engines

Publications (2)

Publication Number Publication Date
EP0516628A1 EP0516628A1 (en) 1992-12-09
EP0516628B1 true EP0516628B1 (en) 1994-04-06

Family

ID=6400845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901693A Expired - Lifetime EP0516628B1 (en) 1990-02-23 1991-01-17 Fuel-injection valve for internal-combustion engines

Country Status (5)

Country Link
US (1) US5244152A (en)
EP (1) EP0516628B1 (en)
JP (1) JPH05504179A (en)
DE (2) DE4005774A1 (en)
WO (1) WO1991014092A1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568513A (en) * 1993-05-11 1996-10-22 Ericsson Inc. Standby power savings with cumulative parity check in mobile phones
DE9407079U1 (en) * 1993-08-03 1994-12-08 Robert Bosch Gmbh, 70469 Stuttgart Fuel injection nozzle for an internal combustion engine
IT232490Y1 (en) * 1994-07-01 2000-01-10 Elasis Sistema Ricerca Fiat BLOCK TRAVEL ADJUSTMENT DEVICE FOR A FUEL INJECTOR
DE4440182C2 (en) * 1994-11-10 2003-09-18 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE4442649C2 (en) * 1994-11-30 1996-10-24 Siemens Ag Electro-hydraulic drive
US5934520A (en) * 1997-11-03 1999-08-10 Nordson Corporation Liquid dispensing device
DE19946906A1 (en) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE102004046888A1 (en) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Injector for fuel injection on an internal combustion engine
US7617955B2 (en) * 2004-10-28 2009-11-17 Nordson Corporation Method and system for dispensing liquid from a module having a flexible bellows seal
US7296714B2 (en) * 2004-11-22 2007-11-20 Nordson Corporation Device for dispensing a heated liquid having a flexible hydraulic seal
DE102009000185A1 (en) * 2009-01-13 2010-07-15 Robert Bosch Gmbh Device for injecting fuel
US8333307B2 (en) * 2009-10-06 2012-12-18 Nordson Corporation Liquid dispensing module
DE102011107291A1 (en) * 2011-07-15 2013-01-17 Deutz Aktiengesellschaft Roller plunger pump unit
US9377114B2 (en) 2012-04-25 2016-06-28 Nordson Corporation Pressure control valve for reactive adhesives
US10753493B2 (en) * 2018-03-29 2020-08-25 Hamilton Sunstrand Corporation Valve with segmented spring guide assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470282A (en) * 1947-07-28 1949-05-17 Frederick C Baker Mounting for shafts and the like
CH329505A (en) * 1955-02-23 1958-04-30 Saurer Ag Adolph Method for controlling the flow cross-section of injection nozzles for internal combustion engines and injection nozzle for carrying out the method
DK128023B (en) * 1970-03-12 1974-02-18 Burmeister & Wain S Af As Fuel injection valve for internal combustion engines.
DE2127460C3 (en) * 1971-06-03 1973-11-22 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Rotationally symmetrical fuel injector
US4527986A (en) * 1983-09-22 1985-07-09 General Motors Corporation Resilient anti-backlash shaft coupling
DE3610658A1 (en) * 1985-11-21 1987-05-27 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
JPH07109181B2 (en) * 1986-12-05 1995-11-22 日本電装株式会社 Fuel injection device for internal combustion engine
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
DE3840339A1 (en) * 1988-11-30 1990-05-31 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
GB9012288D0 (en) * 1990-06-01 1990-07-18 Lucas Ind Plc Fuel injection pump

Also Published As

Publication number Publication date
JPH05504179A (en) 1993-07-01
WO1991014092A1 (en) 1991-09-19
DE4005774A1 (en) 1991-08-29
US5244152A (en) 1993-09-14
EP0516628A1 (en) 1992-12-09
DE59101332D1 (en) 1994-05-11

Similar Documents

Publication Publication Date Title
EP0282480B1 (en) Fuel injection nozzle for internal combustion engines
EP0516628B1 (en) Fuel-injection valve for internal-combustion engines
EP0980474B1 (en) Fuel injector for auto-ignition internal combustion engines
WO1988009869A1 (en) Fuel injection nozzle for internal combustion engines
EP1395744B1 (en) Fuel injection device for combustion motors, especially common rail injector, fuel system and internal combustion engine
DE4341545A1 (en) Fuel injection device for internal combustion engines
EP0637686B1 (en) Fuel injection nozzle for internal combustion engines
EP1518049B1 (en) Fuel injection valve for an internal combustion engine
DE4101235C1 (en)
EP0444053B1 (en) Fuel injection nozzle for internal combustion engines
EP0240693B1 (en) Fuel injector for internal-combustion engines
DE10063261B4 (en) Fuel injector
DE19808798A1 (en) Fuel injector for an internal combustion engine
WO2003004861A1 (en) Fuel injector comprising a force-balanced control valve
EP0445126B1 (en) Fuel injection nozzle for internal combustion engines
DE4408245A1 (en) Injection nozzle for internal combustion engines
DE4340874C2 (en) Fuel injection nozzle for internal combustion engines
DE9205975U1 (en) Fuel injection nozzle for internal combustion engines
DE3907569A1 (en) FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE9301992U1 (en) Fuel injection nozzle for internal combustion engines
EP1815129B1 (en) Fuel-injection nozzle
DE3937955A1 (en) Fuel injection nozzle for IC engine - has second closing spring retained in intermediate section of housing
DE3819814A1 (en) Fuel injection nozzle for internal combustion engines
DE9407080U1 (en) Fuel injection nozzle for an internal combustion engine
DD275892A1 (en) FUEL INJECTION MOLDING, IN PARTICULAR MULTIPLE INJECTION MOLDING FOR INTERNAL COMBUSTION ENGINES

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: 19920716

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19930924

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

REF Corresponds to:

Ref document number: 59101332

Country of ref document: DE

Date of ref document: 19940511

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

Effective date: 19940614

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

Ref country code: GB

Payment date: 19950109

Year of fee payment: 5

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

Ref country code: FR

Payment date: 19950131

Year of fee payment: 5

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

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

Ref country code: DE

Payment date: 19950323

Year of fee payment: 5

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960117

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960117

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

Ref country code: FR

Effective date: 19960930

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

Ref country code: DE

Effective date: 19961001

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST