EP2905458B1 - Nozzle assembly for a fuel injector and fuel injector - Google Patents

Nozzle assembly for a fuel injector and fuel injector Download PDF

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Publication number
EP2905458B1
EP2905458B1 EP14199945.8A EP14199945A EP2905458B1 EP 2905458 B1 EP2905458 B1 EP 2905458B1 EP 14199945 A EP14199945 A EP 14199945A EP 2905458 B1 EP2905458 B1 EP 2905458B1
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EP
European Patent Office
Prior art keywords
nozzle
spring
sleeve
nozzle needle
assembly according
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EP14199945.8A
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German (de)
French (fr)
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EP2905458A1 (en
Inventor
Andreas Gruenberger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/708—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with hydraulic chambers formed by a movable sleeve

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.
  • a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine which has an axially displaceably guided in a high-pressure bore of a nozzle body nozzle needle, which is directly actuated by means of an actuator, such as a piezoelectric actuator.
  • the actuator cooperates with a hydraulic coupler, which comprises a coupler piston accommodated in a coupler sleeve for delimiting a coupler space.
  • the coupler chamber is connected to a control chamber, which is delimited in the axial direction by the nozzle needle. Accordingly, the pressure prevailing in the control chamber is at the nozzle needle, which pressure can be controlled via the actuator.
  • the nozzle needle is able to open or is returned to a nozzle needle seat via a hydraulic pressure force, to which the spring force of a nozzle spring supported on the nozzle needle is added.
  • the stroke of the nozzle needle is usually preset and is limited on the one hand by the nozzle needle seat, on the other hand by a stroke stop.
  • the default hub may be subject to change. This applies in particular if a nozzle retaining nut is used to connect the body components of an injector. Because in the area of screwing The nozzle retaining nut with a body component forces are introduced into the body, which have an influence on the stroke of the nozzle needle. The influence increases with increasing distance of the stroke stop to the seat of the nozzle needle.
  • the present invention is therefore an object of the invention to provide a nozzle assembly for a fuel injector with a hubbeweglichen nozzle needle whose stroke is limited by a "seat close" stroke stop. This is intended to reduce the risk of changing a nozzle needle stroke preset in production.
  • the nozzle assembly proposed for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine comprises a nozzle body and a nozzle needle which is liftably received in a high-pressure bore of the nozzle body for releasing and closing at least one injection opening and acted upon in the direction of a sealing seat by the spring force of a nozzle spring, which is supported on the one hand directly or indirectly on the nozzle needle and on the other hand on a sleeve surrounding the nozzle needle.
  • the sleeve forms a stop surface for limiting the stroke of the nozzle needle.
  • a further spring is supported on the sleeve whose spring force is greater than that of the nozzle spring, so that the sleeve is axially biased by the spring force of the other spring in the direction of a shoulder of the nozzle body.
  • the nozzle assembly according to the invention therefore has at least two springs. This allows a function separation of the functions of a conventional nozzle spring, which consist in a) to put the nozzle needle in their seat and b) to prevent lifting of the sleeve.
  • a conventional nozzle spring which consist in a) to put the nozzle needle in their seat and b) to prevent lifting of the sleeve.
  • the sleeve is usually arranged on the seat facing away from the end of the nozzle needle and supported on the housing side. In this arrangement, the sleeve can also take over the function of a sealing sleeve for the radial limitation of a control chamber.
  • the sleeve - against the spring force of the nozzle spring - axially biased in the direction of a shoulder of the nozzle body.
  • the biasing force is effected by the spring force of the other spring.
  • the arrangement of the other spring in the nozzle body shifts the position of the sleeve in the direction of the sealing seat. Since the sleeve also forms the stroke stop, this also moves in the direction of the sealing seat. In this way, a nozzle assembly is provided with a seat-mounted stroke stop, so that the screwing of a clamping nut with a body component of the injector has a much smaller influence on the preset stroke of the nozzle needle.
  • the shoulder of the nozzle body in the direction of which the sleeve is prestressed axially via the further spring, is formed in the region of the high-pressure bore.
  • the high-pressure bore of the nozzle body to form the shoulder is formed as a stepped bore.
  • the shoulder preferably has a radially extending surface on which the sleeve is directly supported. The axial position of the shoulder in this case determines the axial position of the sleeve or the axial position of the stop surface formed on the sleeve for limiting the nozzle needle stroke.
  • the stop surface and / or at least one shoulder, on which the nozzle spring and / or the other spring is supported the sleeve designed stepped.
  • the sleeve has both a stepped outer contour, as well as a stepped inner contour, so that circumferential paragraphs are formed for supporting both springs.
  • the stop surface for limiting the stroke of the nozzle needle is preferably formed on a shoulder of a stepped inner contour. This is further preferably designed such that decreases with increasing distance to the sealing seat of the inner diameter of the sleeve.
  • the nozzle spring is arranged coaxially with respect to the further spring.
  • the nozzle spring is arranged radially inward with respect to the further spring.
  • the nozzle spring has a smaller diameter than the other spring, so that it can be arranged at least in sections within the other spring. This allows a compact arrangement of the two springs.
  • the nozzle spring is also preferably supported on a shoulder of a stepped inner contour of the sleeve and the further spring is supported on a shoulder of a stepped outer contour of the sleeve.
  • the nozzle spring is preferably supported on an annular collar or on a spring plate connected to the nozzle needle.
  • the annular collar or the spring plate can have a larger outer diameter than the nozzle spring, so that it cooperates with the stop surface of the sleeve forming a stroke stop.
  • a stroke adjustment disk be arranged between the nozzle spring and the annular collar or the spring plate.
  • the further spring is preferably supported at its end facing away from the sleeve on a sealing sleeve, in which a seat distal end of the nozzle needle is guided in a liftable manner.
  • the leadership of the nozzle needle on the sealing sleeve has the advantage that any axial offset is compensated for sealing seat.
  • the spring force of the other spring axially biases the sealing sleeve in the direction of a plate-shaped body component, preferably a throttle plate.
  • a sealing force is effected, which ensures the sealing function of the sealing sleeve.
  • a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having a nozzle assembly according to the invention and an actuator assembly for direct or indirect actuation of the nozzle needle is proposed, wherein the actuator assembly comprises a piezoelectric actuator or a magnetic actuator.
  • the actuator assembly is preferably received in a body member of the injector, which is axially clamped by a clamping nut with the nozzle body.
  • further body components in particular plate-shaped body components, such as a throttle plate, may be arranged.
  • the Aktorbaueria is coupled via a hydraulic or mechanical coupler with the nozzle needle or coupled.
  • the hydraulic or mechanical coupler can be used for force and / or stroke amplification, so that a smaller actuator can be used.
  • the fuel injector shown in longitudinal section comprises a plurality of body components, namely a nozzle body 1, a throttle plate 15, a coupler plate 22 and a holding body 23.
  • a clamping nut 28 which is supported on the nozzle body 1 and screwed to the holding body 23, all body components are axially braced.
  • All body components are axially braced.
  • About the screw of the clamping nut 28 forces are introduced into the injector, which may be relevant to function. For such forces can lead to a change in a preset stroke h of a nozzle needle 2, which is received in a liftable manner in a high-pressure bore 4 of the nozzle body 1 for releasing and closing at least one injection port 3.
  • the magnitude of the influence of the forces depends in particular on the distance of a stop surface A for limiting the nozzle needle stroke from a sealing seat 5 of the nozzle needle 2. To reduce the influence, the distance should be as small as possible.
  • the high-pressure bore 4 of the nozzle body 1 receives two springs, which are each designed as helical compression springs.
  • the first spring is a nozzle spring 6, which is indirectly supported on the one hand via a Hubeinstellhunt 13 on an annular collar 12 of the nozzle needle 2 and on the other hand on a shoulder 10 of a sleeve 7.
  • the nozzle spring 6 is supported by the nozzle needle 2 in the sealing seat 5.
  • the nozzle spring 6 is supported by a control pressure in a control chamber 16, which is delimited by the nozzle needle 2, a seat remote end of the nozzle needle 2 receiving sealing sleeve 14 and the throttle plate 15 at which the sealing sleeve is supported.
  • the further spring 8 serves for the axial prestress of the sealing sleeve 14 with respect to the throttle plate 15 in order to prevent the sealing sleeve 14 from lifting off the throttle plate 15.
  • the further spring 8 is supported on a shoulder 11 of the sleeve 7. Characterized in that the spring force of the spring 8 is selected to be greater than that of the nozzle spring 6, a lifting of the sleeve 7 is prevented by a shoulder 9 of the nozzle body 1, which is formed within the high-pressure bore 4.
  • the sleeve 7 is executed stepped.
  • the stepped design is also present in the formation of the stop surface A, which cooperates with the Hubeinstellin 13 forms a stroke stop.
  • the axial distance between the abutment surface A and the Hubeinstellin 13 thus determines the stroke h of the nozzle needle 2.
  • the arrangement of the sleeve 7 in a region close to the seat has the consequence that the axial distance between the stop surface A and the sealing seat 5 - in comparison to the state the technology - is low. This ensures that the influence of the screwing of the clamping nut on the preset stroke of the nozzle needle 2 and thus on the function of the injector is minimal.
  • the piezoelectric actuator of the actuator assembly 17 is deactivated. This has the consequence that the piezoelectric actuator contracts again.
  • the coupler spring 21 then pushes the coupler piston 18.1 upwards.
  • the movement of the coupler piston 18.1 follow the pressure pin 18.2 and the coupler piston 18.3, possibly supported by the spring force of another spring (not shown).
  • This is accompanied by an increase in pressure in the coupling chamber 19 and in the control chamber 16, so that a hydraulic closing force acts on the nozzle needle 2 - in addition to the spring force of the nozzle spring 6.
  • the nozzle needle 2 is returned to the sealing seat 5 and the injection ended.
  • the Aktorbauffle is presently surrounded by low pressure. This can lead to a leakage in the region of the guidance of the pressure pin 18.2 via the coupler plate 22, which separates the high-pressure region of the injector from the low-pressure region. For discharging a leakage amount, a return 27 is provided.
  • the sole figure represents only a preferred embodiment of the invention. Modifications are possible. In particular, may be provided instead of a piezoelectric actuator, a magnetic actuator for controlling the lifting movement of the nozzle needle.
  • the coupler may be a mechanical coupler.
  • the arrangement of a coupler can be dispensed with in its entirety. The presently selected embodiment is merely illustrative of a fuel injector having a nozzle assembly according to the present invention.

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

Description

Die Erfindung betrifft eine Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung einen Kraftstoffinjektor mit einer solchen Düsenbaugruppe.The invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.

Stand der TechnikState of the art

Aus der Offenlegungsschrift DE 10 2006 021 491 A1 ist ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine bekannt, der eine in einer Hochdruckbohrung eines Düsenkörpers axial verschiebbar geführte Düsennadel besitzt, die mittels eines Aktors, beispielsweise eines Piezoaktors, direkt betätigbar ist. Der Aktor wirkt dabei mit einem hydraulischen Koppler zusammen, der einen in einer Kopplerhülse aufgenommenen Kopplerkolben zur Begrenzung eines Kopplerraums umfasst. Der Kopplerraum ist mit einem Steuerraum verbunden, der in axialer Richtung von der Düsennadel begrenzt wird. An der Düsennadel liegt demnach der im Steuerraum herrschende Druck an, der über den Aktor steuerbar ist. In Abhängigkeit vom Druck im Steuerraum, vermag die Düsennadel zu öffnen oder wird über eine hydraulische Druckkraft, zu welcher sich die Federkraft einer an der Düsennadel abgestützten Düsenfeder addiert, in einen Düsennadelsitz zurückgestellt.From the publication DE 10 2006 021 491 A1 a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine is known, which has an axially displaceably guided in a high-pressure bore of a nozzle body nozzle needle, which is directly actuated by means of an actuator, such as a piezoelectric actuator. The actuator cooperates with a hydraulic coupler, which comprises a coupler piston accommodated in a coupler sleeve for delimiting a coupler space. The coupler chamber is connected to a control chamber, which is delimited in the axial direction by the nozzle needle. Accordingly, the pressure prevailing in the control chamber is at the nozzle needle, which pressure can be controlled via the actuator. Depending on the pressure in the control chamber, the nozzle needle is able to open or is returned to a nozzle needle seat via a hydraulic pressure force, to which the spring force of a nozzle spring supported on the nozzle needle is added.

Bei Kraftstoffinjektoren der vorstehend genannten Art ist der Hub der Düsennadel in der Regel voreingestellt und wird einerseits durch den Düsennadelsitz, andererseits durch einen Hubanschlag begrenzt. Der voreingestellte Hub kann jedoch einer Veränderung unterliegen. Dies gilt insbesondere, wenn zur Verbindung der Körperbauteile eines Injektors eine Düsenspannmutter verwendet wird. Denn im Bereich der Verschraubung der Düsenspannmutter mit einem Körperbauteil werden Kräfte in den Körper eingeleitet, die Einfluss auf den Hub der Düsennadel haben. Der Einfluss steigt mit zunehmendem Abstand des Hubanschlags zum Sitz der Düsennadel.In fuel injectors of the aforementioned type, the stroke of the nozzle needle is usually preset and is limited on the one hand by the nozzle needle seat, on the other hand by a stroke stop. However, the default hub may be subject to change. This applies in particular if a nozzle retaining nut is used to connect the body components of an injector. Because in the area of screwing The nozzle retaining nut with a body component forces are introduced into the body, which have an influence on the stroke of the nozzle needle. The influence increases with increasing distance of the stroke stop to the seat of the nozzle needle.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Düsenbaugruppe für einen Kraftstoffinjektor mit einer hubbeweglichen Düsennadel anzugeben, deren Hub durch einen "sitznahen" Hubanschlag begrenzt wird. Dadurch soll die Gefahr verringert werden, dass sich ein in der Fertigung voreingestellter Düsennadelhub verändert.The present invention is therefore an object of the invention to provide a nozzle assembly for a fuel injector with a hubbeweglichen nozzle needle whose stroke is limited by a "seat close" stroke stop. This is intended to reduce the risk of changing a nozzle needle stroke preset in production.

Die Aufgabe wird gelöst durch die Düsenbaugruppe mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Zur Lösung der Aufgabe wird ferner der Kraftstoffinjektor mit den Merkmalen des Anspruchs 9 vorgeschlagen.The object is achieved by the nozzle assembly having the features of claim 1. Advantageous developments of the invention are specified in the subclaims. To solve the problem, the fuel injector is further proposed with the features of claim 9.

Offenbarung der ErfindungDisclosure of the invention

Die für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine vorgeschlagene Düsenbaugruppe umfasst einen Düsenkörper und eine Düsennadel, die zum Freigeben und Verschließen wenigstens einer Einspritzöffnung in einer Hochdruckbohrung des Düsenkörpers hubbeweglich aufgenommen und in Richtung eines Dichtsitzes von der Federkraft einer Düsenfeder beaufschlagt ist, die einerseits unmittelbar oder mittelbar an der Düsennadel und andererseits an einer die Düsennadel umgebenden Hülse abgestützt ist. Erfindungsgemäß bildet die Hülse eine Anschlagfläche zur Hubbegrenzung der Düsennadel aus. Ferner erfindungsgemäß ist an der Hülse eine weitere Feder abgestützt, deren Federkraft größer als die der Düsenfeder ist, so dass die Hülse über die Federkraft der weiteren Feder in Richtung eines Absatzes des Düsenkörpers axial vorgespannt ist.The nozzle assembly proposed for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine comprises a nozzle body and a nozzle needle which is liftably received in a high-pressure bore of the nozzle body for releasing and closing at least one injection opening and acted upon in the direction of a sealing seat by the spring force of a nozzle spring, which is supported on the one hand directly or indirectly on the nozzle needle and on the other hand on a sleeve surrounding the nozzle needle. According to the invention, the sleeve forms a stop surface for limiting the stroke of the nozzle needle. Further according to the invention, a further spring is supported on the sleeve whose spring force is greater than that of the nozzle spring, so that the sleeve is axially biased by the spring force of the other spring in the direction of a shoulder of the nozzle body.

Die erfindungsgemäße Düsenbaugruppe weist demnach wenigstens zwei Federn auf. Dies ermöglicht eine Funktionstrennung der Funktionen einer herkömmlichen Düsenfeder, die darin bestehen, a) die Düsennadel in ihren Sitz zu stellen und b) ein Abheben der Hülse zu verhindern. Bei herkömmlichen Injektoren ist die Hülse in der Regel am sitzabgewandten Ende der Düsennadel angeordnet und gehäuseseitig abgestützt. In dieser Anordnung vermag die Hülse zugleich die Funktion einer Dichthülse zur radialen Begrenzung eines Steuerraums zu übernehmen. Demgegenüber ist bei der erfindungsgemäßen Düsenbaugruppe die Hülse - entgegen der Federkraft der Düsenfeder - in Richtung eines Absatzes des Düsenkörpers axial vorgespannt. Die Vorspannkraft wird durch die Federkraft der weiteren Feder bewirkt. Durch die Anordnung der weiteren Feder im Düsenkörper verschiebt sich die Lage der Hülse in Richtung des Dichtsitzes. Da die Hülse zugleich den Hubanschlag ausbildet, wandert auch dieser in Richtung des Dichtsitzes. Auf diese Weise wird eine Düsenbaugruppe mit einem sitznahen Hubanschlag geschaffen, so dass die Verschraubung einer Spannmutter mit einem Körperbauteil des Injektors einen deutlich geringeren Einfluss auf den voreingestellten Hub der Düsennadel hat.The nozzle assembly according to the invention therefore has at least two springs. This allows a function separation of the functions of a conventional nozzle spring, which consist in a) to put the nozzle needle in their seat and b) to prevent lifting of the sleeve. In conventional injectors, the sleeve is usually arranged on the seat facing away from the end of the nozzle needle and supported on the housing side. In this arrangement, the sleeve can also take over the function of a sealing sleeve for the radial limitation of a control chamber. In contrast, in the nozzle assembly according to the invention, the sleeve - against the spring force of the nozzle spring - axially biased in the direction of a shoulder of the nozzle body. The biasing force is effected by the spring force of the other spring. The arrangement of the other spring in the nozzle body shifts the position of the sleeve in the direction of the sealing seat. Since the sleeve also forms the stroke stop, this also moves in the direction of the sealing seat. In this way, a nozzle assembly is provided with a seat-mounted stroke stop, so that the screwing of a clamping nut with a body component of the injector has a much smaller influence on the preset stroke of the nozzle needle.

Bevorzugt ist der Absatz des Düsenkörpers, in dessen Richtung die Hülse axial über die weitere Feder vorgespannt ist, im Bereich der Hochdruckbohrung ausgebildet. Weiterhin bevorzugt ist die Hochdruckbohrung des Düsenkörpers zur Ausbildung des Absatzes als Stufenbohrung ausbildet. Der Absatz besitzt vorzugsweise eine radial verlaufende Fläche, an welcher die Hülse unmittelbar abgestützt ist. Die axiale Lage des Absatzes bestimmt in diesem Fall die axiale Lage der Hülse bzw. die axiale Lage der an der Hülse ausgebildeten Anschlagfläche zur Begrenzung des Düsennadelhubes.Preferably, the shoulder of the nozzle body, in the direction of which the sleeve is prestressed axially via the further spring, is formed in the region of the high-pressure bore. Further preferably, the high-pressure bore of the nozzle body to form the shoulder is formed as a stepped bore. The shoulder preferably has a radially extending surface on which the sleeve is directly supported. The axial position of the shoulder in this case determines the axial position of the sleeve or the axial position of the stop surface formed on the sleeve for limiting the nozzle needle stroke.

Weiterhin bevorzugt ist zur Ausbildung der Anschlagfläche und/oder wenigstens eines Absatzes, an welcher die Düsenfeder und/oder die weitere Feder abgestützt ist, die Hülse gestuft ausgeführt. Vorteilhafterweise besitzt die Hülse sowohl eine gestufte Außenkontur, als auch eine gestufte Innenkontur, so dass umlaufende Absätze zur Abstützung beider Federn ausgebildet werden. Die Anschlagfläche zur Hubbegrenzung der Düsennadel ist vorzugsweise an einem Absatz einer gestuft ausgeführten Innenkontur ausgebildet. Diese ist weiterhin vorzugsweise derart gestaltet, dass sich mit zunehmendem Abstand zum Dichtsitz der Innendurchmesser der Hülse verringert.Further preferred is to form the stop surface and / or at least one shoulder, on which the nozzle spring and / or the other spring is supported, the sleeve designed stepped. Advantageously, the sleeve has both a stepped outer contour, as well as a stepped inner contour, so that circumferential paragraphs are formed for supporting both springs. The stop surface for limiting the stroke of the nozzle needle is preferably formed on a shoulder of a stepped inner contour. This is further preferably designed such that decreases with increasing distance to the sealing seat of the inner diameter of the sleeve.

Vorteilhafterweise ist die Düsenfeder koaxial in Bezug auf die weitere Feder angeordnet. Alternativ oder ergänzend wird vorgeschlagen, dass die Düsenfeder radial innen in Bezug auf die weitere Feder angeordnet ist. Das heißt, dass die Düsenfeder einen kleineren Durchmesser als die weitere Feder besitzt, so dass sie zumindest abschnittsweise innerhalb der weiteren Feder angeordnet sein kann. Dies ermöglicht eine kompakte Anordnung der beiden Federn. In diesem Fall ist ferner bevorzugt die Düsenfeder an einem Absatz einer gestuft ausgeführten Innenkontur der Hülse und die weitere Feder an einem Absatz einer gestuft ausgeführten Außenkontur der Hülse abgestützt.Advantageously, the nozzle spring is arranged coaxially with respect to the further spring. Alternatively or additionally, it is proposed that the nozzle spring is arranged radially inward with respect to the further spring. This means that the nozzle spring has a smaller diameter than the other spring, so that it can be arranged at least in sections within the other spring. This allows a compact arrangement of the two springs. In this case, the nozzle spring is also preferably supported on a shoulder of a stepped inner contour of the sleeve and the further spring is supported on a shoulder of a stepped outer contour of the sleeve.

Im Bereich der Düsennadel ist die Düsenfeder vorzugsweise an einem Ringbund oder an einem mit der Düsennadel verbundenen Federteller abgestützt. Der Ringbund bzw. der Federteller kann dabei einen größeren Außendurchmesser als die Düsenfeder besitzen, so dass er mit der Anschlagfläche der Hülse einen Hubanschlag ausbildend zusammenwirkt. Als weiterbildende Maßnahme wird vorgeschlagen, dass zwischen der Düsenfeder und dem Ringbund bzw. dem Federteller eine Hubeinstellscheibe angeordnet ist. Die Hubeinstellscheibe erlaubt eine genaue Voreinstellung des Düsennadelhubes. In diesem Fall ist der Außendurchmesser der Hubeinstellscheibe derart zu bemessen, dass sie mit der Anschlagfläche der Hülse anschlagbildend zusammenwirkt.In the region of the nozzle needle, the nozzle spring is preferably supported on an annular collar or on a spring plate connected to the nozzle needle. The annular collar or the spring plate can have a larger outer diameter than the nozzle spring, so that it cooperates with the stop surface of the sleeve forming a stroke stop. As a further development measure, it is proposed that a stroke adjustment disk be arranged between the nozzle spring and the annular collar or the spring plate. The Hubeinstellscheibe allows accurate pre-adjustment of the nozzle needle. In this case, the outer diameter of the Hubeinstellscheibe is to be dimensioned such that it cooperates with the stop surface of the sleeve stop forming.

Die weitere Feder ist vorzugsweise an ihrem der Hülse abgewandten Ende an einer Dichthülse abgestützt, in welcher ein sitzfernes Ende der Düsennadel hubbeweglich geführt ist. Die Führung der Düsennadel über die Dichthülse besitzt den Vorteil, dass ein etwaiger Achsversatz zum Dichtsitz ausgleichbar ist.The further spring is preferably supported at its end facing away from the sleeve on a sealing sleeve, in which a seat distal end of the nozzle needle is guided in a liftable manner. The leadership of the nozzle needle on the sealing sleeve has the advantage that any axial offset is compensated for sealing seat.

Ferner wird vorgeschlagen, dass die Federkraft der weiteren Feder die Dichthülse in Richtung eines plattenförmigen Körperbauteils, vorzugsweise einer Drosselplatte, axial vorspannt. Über die axiale Vorspannkraft wird eine Dichtkraft bewirkt, welche die Dichtfunktion der Dichthülse gewährleistet. Dies ist insbesondere dann von Vorteil, wenn gemäß einer bevorzugten Ausführungsform der Erfindung die Düsennadel, die Dichthülse und die Drosselplatte einen Steuer- oder Kopplerraum des Injektors begrenzen.It is also proposed that the spring force of the other spring axially biases the sealing sleeve in the direction of a plate-shaped body component, preferably a throttle plate. About the axial biasing force a sealing force is effected, which ensures the sealing function of the sealing sleeve. This is particularly advantageous if, according to a preferred embodiment of the invention, the nozzle needle, the sealing sleeve and the throttle plate define a control or coupler space of the injector.

Darüber hinaus wird ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer erfindungsgemäßen Düsenbaugruppe und einer Aktorbaugruppe zur direkten oder indirekten Betätigung der Düsennadel vorgeschlagen, wobei die Aktorbaugruppe einen Piezoaktor oder einen Magnetaktor umfasst. Die Aktorbaugruppe ist vorzugsweise in einem Körperbauteil des Injektors aufgenommen, das über eine Spannmutter mit dem Düsenkörper axial verspannt ist. Zwischen dem Düsenkörper und dem die Aktorbaugruppe aufnehmendem Körperbauteil können dabei weitere Körperbauteile, insbesondere plattenförmige Körperbauteile, wie beispielsweise eine Drosselplatte, angeordnet sein. Hier kommen die Vorteile einer erfindungsgemäßen Düsenbaugruppe besonders gut zum Tragen, da der "sitznahe" Hubanschlag zur Begrenzung des Hubes der Düsennadel den Einfluss der Spannmutter bzw. der über die Verschraubung der Spannmutter eingeleiteten Kräfte auf den voreingestellten Hub der Düsennadel verringert. Hieraus ergeben sich eine erhöhte Funktionssicherheit sowie ein Auslegungsvorteil.In addition, a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having a nozzle assembly according to the invention and an actuator assembly for direct or indirect actuation of the nozzle needle is proposed, wherein the actuator assembly comprises a piezoelectric actuator or a magnetic actuator. The actuator assembly is preferably received in a body member of the injector, which is axially clamped by a clamping nut with the nozzle body. Between the nozzle body and the Aktorbaugruppe receiving body component In this case, further body components, in particular plate-shaped body components, such as a throttle plate, may be arranged. Here, the advantages of a nozzle assembly according to the invention come particularly well, since the "seat close" stroke stop for limiting the stroke of the nozzle needle reduces the influence of the clamping nut or the introduced via the screw of the clamping nut forces on the preset stroke of the nozzle needle. This results in increased reliability and a design advantage.

Vorteilhafterweise ist die Aktorbaugruppe über einen hydraulischen oder mechanischen Koppler mit der Düsennadel gekoppelt oder koppelbar. Der hydraulische bzw. mechanische Koppler kann zur Kraft- und/oder Hubverstärkung verwendet werden, so dass ein kleinerer Aktor eingesetzt werden kann.Advantageously, the Aktorbaugruppe is coupled via a hydraulic or mechanical coupler with the nozzle needle or coupled. The hydraulic or mechanical coupler can be used for force and / or stroke amplification, so that a smaller actuator can be used.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Diese zeigt einen schematischen Längsschnitt durch einen Kraftstoffinjektor mit einer erfindungsgemäßen Düsenbaugruppe.A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. This shows a schematic longitudinal section through a fuel injector with a nozzle assembly according to the invention.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Der im Längsschnitt dargestellte Kraftstoffinjektor umfasst mehrere Körperbauteile, nämlich einen Düsenkörper 1, eine Drosselplatte 15, eine Kopplerplatte 22 und einen Haltekörper 23. Über eine Spannmutter 28, die am Düsenkörper 1 abgestützt und mit dem Haltekörper 23 verschraubt ist, sind sämtliche Körperbauteile axial verspannt. Über die Verschraubung der Spannmutter 28 werden Kräfte in den Injektor eingeleitet, die funktionsrelevant sein können. Denn derartige Kräfte können zu einer Veränderung eines voreingestellten Hubes h einer Düsennadel 2 führen, die in einer Hochdruckbohrung 4 des Düsenkörpers 1 zum Freigeben und Verschließen wenigstens einer Einspritzöffnung 3 hubbeweglich aufgenommen ist. Wie groß der Einfluss der Kräfte ist, hängt insbesondere vom Abstand einer Anschlagfläche A zur Begrenzung des Düsennadelhubes von einem Dichtsitz 5 der Düsennadel 2 ab. Um den Einfluss zu verringern, ist der Abstand möglichst klein zu wählen.The fuel injector shown in longitudinal section comprises a plurality of body components, namely a nozzle body 1, a throttle plate 15, a coupler plate 22 and a holding body 23. About a clamping nut 28 which is supported on the nozzle body 1 and screwed to the holding body 23, all body components are axially braced. About the screw of the clamping nut 28 forces are introduced into the injector, which may be relevant to function. For such forces can lead to a change in a preset stroke h of a nozzle needle 2, which is received in a liftable manner in a high-pressure bore 4 of the nozzle body 1 for releasing and closing at least one injection port 3. The magnitude of the influence of the forces depends in particular on the distance of a stop surface A for limiting the nozzle needle stroke from a sealing seat 5 of the nozzle needle 2. To reduce the influence, the distance should be as small as possible.

Bei dem dargestellten Kraftstoffinjektor nimmt die Hochdruckbohrung 4 des Düsenkörpers 1 zwei Federn auf, die jeweils als Schraubendruckfedern ausgebildet sind. Bei der ersten Feder handelt es sich um eine Düsenfeder 6, die einerseits mittelbar über eine Hubeinstellscheibe 13 an einem Ringbund 12 der Düsennadel 2 und andererseits an einem Absatz 10 einer Hülse 7 abgestützt ist. Die Düsenfeder 6 hält die Düsennadel 2 im Dichtsitz 5. Unterstützt wird die Düsenfeder 6 dabei von einem Steuerdruck in einem Steuerraum 16, der von der Düsennadel 2, einer das sitzferne Ende der Düsennadel 2 aufnehmenden Dichthülse 14 und der Drosselplatte 15 begrenzt wird, an welcher die Dichthülse abgestützt ist. Die weitere Feder 8 dient der axialen Vorspannung der Dichthülse 14 gegenüber der Drosselplatte 15, um zu verhindern, dass die Dichthülse 14 von der Drosselplatte 15 abhebt. Andernends ist die weitere Feder 8 an einem Absatz 11 der Hülse 7 abgestützt. Dadurch, dass die Federkraft der Feder 8 größer als die der Düsenfeder 6 gewählt ist, wird ein Abheben der Hülse 7 von einem Absatz 9 des Düsenkörpers 1 verhindert, der innerhalb der Hochdruckbohrung 4 ausgebildet ist.In the fuel injector shown, the high-pressure bore 4 of the nozzle body 1 receives two springs, which are each designed as helical compression springs. In the The first spring is a nozzle spring 6, which is indirectly supported on the one hand via a Hubeinstellscheibe 13 on an annular collar 12 of the nozzle needle 2 and on the other hand on a shoulder 10 of a sleeve 7. The nozzle spring 6 is supported by the nozzle needle 2 in the sealing seat 5. The nozzle spring 6 is supported by a control pressure in a control chamber 16, which is delimited by the nozzle needle 2, a seat remote end of the nozzle needle 2 receiving sealing sleeve 14 and the throttle plate 15 at which the sealing sleeve is supported. The further spring 8 serves for the axial prestress of the sealing sleeve 14 with respect to the throttle plate 15 in order to prevent the sealing sleeve 14 from lifting off the throttle plate 15. At the other end, the further spring 8 is supported on a shoulder 11 of the sleeve 7. Characterized in that the spring force of the spring 8 is selected to be greater than that of the nozzle spring 6, a lifting of the sleeve 7 is prevented by a shoulder 9 of the nozzle body 1, which is formed within the high-pressure bore 4.

Zur Ausbildung der Absätze 10, 11 ist die Hülse 7 gestuft ausgeführt. Die gestufte Ausführung dient vorliegend ferner der Ausbildung der Anschlagfläche A, die mit der Hubeinstellscheibe 13 einen Hubanschlag ausbildend zusammenwirkt. Der axiale Abstand zwischen der Anschlagfläche A und der Hubeinstellscheibe 13 bestimmt demnach den Hub h der Düsennadel 2. Die Anordnung der Hülse 7 in einem sitznahen Bereich hat zur Folge, dass der axiale Abstand zwischen der Anschlagfläche A und dem Dichtsitz 5 - im Vergleich zum Stand der Technik - gering ist. Dadurch ist sichergestellt, dass der Einfluss der Verschraubung der Spannmutter auf den voreingestellten Hub der Düsennadel 2 und damit auf die Funktion des Injektors minimal ist.To form the paragraphs 10, 11, the sleeve 7 is executed stepped. The stepped design is also present in the formation of the stop surface A, which cooperates with the Hubeinstellscheibe 13 forms a stroke stop. The axial distance between the abutment surface A and the Hubeinstellscheibe 13 thus determines the stroke h of the nozzle needle 2. The arrangement of the sleeve 7 in a region close to the seat has the consequence that the axial distance between the stop surface A and the sealing seat 5 - in comparison to the state the technology - is low. This ensures that the influence of the screwing of the clamping nut on the preset stroke of the nozzle needle 2 and thus on the function of the injector is minimal.

Die Funktionsweise des dargestellten Injektors ist wie folgt:

  • Zum Freigeben der Einspritzöffnung 3 wird eine Piezoaktor einer Aktorbaugruppe 17 aktiviert, die in dem Haltekörper 23 aufgenommen ist. Bei Aktivierung dehnt sich der Piezoaktor aus und drückt einen ersten Kopplerkolben 18.1 eines hydraulischen Kopplers 18 entgegen der Federkraft einer Kopplerfeder 21 nach unten. Über einen Druckstift 18.2 ist der erste Kopplerkolben 18.1 mit einem zweiten Kopplerkolben 18.3 wirkverbunden, so dass auch dieser nach unten bewegt wird. Die Bewegung des zweiten Kopplerkolbens 18.3 hat zur Folge, dass sich das Volumen eines Kopplerraums 19, der in der Kopplerplatte 22 ausgebildet ist, vergrößert, so dass ein Druckabfall im Kopplerraum 19 bewirkt wird. Da der Kopplerraum 19 über einen Verbindungskanal 20 mit dem Steuerraum 16 verbunden ist, fällt auch der Druck im Steuerraum 16 ab. Der Druckabfall im Steuerraum 16 entlastet die Düsennadel 2, so dass diese vom Dichtsitz 5 abhebt und die Einspritzöffnung 3 freigibt. Über einen seitlich in den Körperbauteilen des Injektors angeordneten Zulaufkanal 24, der an einen Hochdruckspeicher 26 angeschlossen ist, wird der Einspritzöffnung 3 unter hohem Druck stehender Kraftstoff zugeführt. Zur Optimierung der Kraftstoffströmung in der Hochdruckbohrung 4 sind in der Hülse 7 Verbindungskanäle 25 ausgebildet.
The operation of the illustrated injector is as follows:
  • To release the injection opening 3, a piezoelectric actuator of an actuator assembly 17 is activated, which is received in the holding body 23. When activated, the piezoelectric actuator expands and presses a first coupler piston 18.1 of a hydraulic coupler 18 against the spring force of a coupler spring 21 down. Via a pressure pin 18.2, the first coupler piston 18.1 is operatively connected to a second coupler piston 18.3, so that this is moved downward. The result of the movement of the second coupler piston 18.3 is that the volume of a coupler space 19 which is formed in the coupler plate 22 increases, so that a pressure drop in the coupler space 19 is effected. Since the coupler space 19 via a connecting channel 20th is connected to the control chamber 16, and the pressure in the control chamber 16 drops. The pressure drop in the control chamber 16 relieves the nozzle needle 2, so that it lifts off from the sealing seat 5 and the injection port 3 releases. Via a laterally arranged in the body components of the injector inlet channel 24 which is connected to a high-pressure accumulator 26, the injection port 3 is supplied under high pressure fuel. To optimize the flow of fuel in the high-pressure bore 4 7 connecting channels 25 are formed in the sleeve.

Zum Verschließen der Einspritzöffnung 3 wird der Piezoaktor der Aktorbaugruppe 17 deaktiviert. Dies hat zur Folge, dass sich der Piezoaktor wieder zusammenzieht. Die Kopplerfeder 21 drückt dann den Kopplerkolben 18.1 nach oben. Der Bewegung des Kopplerkolbens 18.1 folgen der Druckstift 18.2 und der Kopplerkolben 18.3, ggf. unterstützt durch die Federkraft einer weiteren Feder (nicht dargestellt). Damit einher geht ein Druckanstieg im Koppelraum 19 sowie im Steuerraum 16, so dass auf die Düsennadel 2 - ergänzend zur Federkraft der Düsenfeder 6 - eine hydraulische Schließkraft wirkt. Die Düsennadel 2 wird in den Dichtsitz 5 zurückgestellt und die Einspritzung beendet.For closing the injection opening 3, the piezoelectric actuator of the actuator assembly 17 is deactivated. This has the consequence that the piezoelectric actuator contracts again. The coupler spring 21 then pushes the coupler piston 18.1 upwards. The movement of the coupler piston 18.1 follow the pressure pin 18.2 and the coupler piston 18.3, possibly supported by the spring force of another spring (not shown). This is accompanied by an increase in pressure in the coupling chamber 19 and in the control chamber 16, so that a hydraulic closing force acts on the nozzle needle 2 - in addition to the spring force of the nozzle spring 6. The nozzle needle 2 is returned to the sealing seat 5 and the injection ended.

Die Aktorbaugruppe ist vorliegend von Niederdruck umgeben. Dies kann zu einer Leckage im Bereich der Führung des Druckstifts 18.2 über die Kopplerplatte 22 führen, welche den Hochdruckbereich des Injektors von dem Niederdruckbereich trennt. Zum Abführen einer Leckagemenge ist ein Rücklauf 27 vorgesehen.The Aktorbaugruppe is presently surrounded by low pressure. This can lead to a leakage in the region of the guidance of the pressure pin 18.2 via the coupler plate 22, which separates the high-pressure region of the injector from the low-pressure region. For discharging a leakage amount, a return 27 is provided.

Es wird angemerkt, dass die einzige Figur lediglich eine bevorzugte Ausführungsform der Erfindung darstellt. Abwandlungen sind möglich. Insbesondere kann anstelle eines Piezoaktors ein Magnetaktor zur Steuerung der Hubbewegung der Düsennadel vorgesehen sein. Ferner kann der Koppler ein mechanischer Koppler sein. Darüber hinaus kann auf die Anordnung eines Kopplers auch in Gänze verzichtet werden. Die vorliegend gewählte Ausführungsform dient lediglich der Darstellung eines Kraftstoffinjektors mit einer erfindungsgemäßen Düsenbaugruppe.It is noted that the sole figure represents only a preferred embodiment of the invention. Modifications are possible. In particular, may be provided instead of a piezoelectric actuator, a magnetic actuator for controlling the lifting movement of the nozzle needle. Furthermore, the coupler may be a mechanical coupler. In addition, the arrangement of a coupler can be dispensed with in its entirety. The presently selected embodiment is merely illustrative of a fuel injector having a nozzle assembly according to the present invention.

Claims (10)

  1. Nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising a nozzle body (1) and comprising a nozzle needle (2) which, for the purposes of opening up and closing off at least one injection opening (3), is accommodated in a high-pressure bore (4) of the nozzle body (1) so as to be capable of performing stroke movements and is acted on in the direction of a sealing seat (5) by the spring force of a nozzle spring (6), which nozzle spring is at one side supported directly or indirectly on the nozzle needle (2) and is at the other side supported on a sleeve (7) surrounding the nozzle needle (2), characterized in that the sleeve (7) forms an abutment surface (A) for limiting the stroke of the nozzle needle (2), and a further spring (8) is supported on the sleeve (7), the spring force of which further spring is greater than that of the nozzle spring (6), such that the sleeve (7) is axially preloaded in the direction of a shoulder (9) of the nozzle body (1) by way of the spring force of the further spring (8), and lifting of the sleeve (7) from the shoulder (9) is prevented.
  2. Nozzle assembly according to Claim 1, characterized in that the high-pressure bore (4) of the nozzle body (1) is in the form of a stepped bore for the purposes of forming the shoulder (9).
  3. Nozzle assembly according to Claim 1 or 2,
    characterized in that the sleeve (7) is of stepped design for the purposes of forming the abutment surface (A) and/or at least one shoulder (10, 11) on which the nozzle spring (6) and/or the further spring (8) is supported.
  4. Nozzle assembly according to one of the preceding claims,
    characterized in that the nozzle spring (6) is arranged coaxially, and/or radially at the inside, in relation to the further spring (8).
  5. Nozzle assembly according to one of the preceding claims,
    characterized in that the nozzle spring (6) is supported on a ring-shaped collar (12) of the nozzle needle (2) or on a spring plate connected to the nozzle needle (2), wherein preferably, a stroke-setting disk (13) is arranged between the nozzle spring (6) and the ring-shaped collar (12) or the spring plate.
  6. Nozzle assembly according to one of the preceding claims,
    characterized in that the further spring (8) is, at its end averted from the sleeve (7), supported on a sealing sleeve (14) in which an end of the nozzle needle (2) remote from the seat is guided so as to be capable of performing stroke movements.
  7. Nozzle assembly according to Claim 6,
    characterized in that the spring force of the further spring (8) axially preloads the sealing sleeve (14) in the direction of a plate-shaped body component, preferably a throttle plate (15).
  8. Nozzle assembly according to Claim 7,
    characterized in that the nozzle needle (2), the sealing sleeve (14) and the throttle plate (15) delimit a control or coupler chamber (16).
  9. Fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, having a nozzle assembly according to one of the preceding claims and having an actuator assembly (17) for the direct or indirect actuation of the nozzle needle (2), wherein the actuator assembly (17) comprises a piezo actuator or a solenoid actuator.
  10. Fuel injector according to Claim 9,
    characterized in that the actuator assembly (17) is, for force and/or stroke boosting purposes, coupled or couplable to the nozzle needle (2) via a hydraulic or mechanical coupler (18).
EP14199945.8A 2014-02-03 2014-12-23 Nozzle assembly for a fuel injector and fuel injector Active EP2905458B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014201850.1A DE102014201850A1 (en) 2014-02-03 2014-02-03 Nozzle assembly for a fuel injector and fuel injector

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EP2905458A1 EP2905458A1 (en) 2015-08-12
EP2905458B1 true EP2905458B1 (en) 2016-09-07

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014211351A1 (en) * 2014-06-13 2015-12-17 Robert Bosch Gmbh Nozzle assembly for a fuel injector and fuel injector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH342792A (en) * 1956-07-19 1959-11-30 Saurer Ag Adolph Injection nozzle with nozzle needle opening in the direction of fuel flow
DE10122256A1 (en) * 2001-05-08 2002-11-21 Bosch Gmbh Robert Fuel injection device for internal combustion engines, in particular common rail injector, and fuel system and internal combustion engine
DE10254734A1 (en) * 2002-11-23 2004-06-03 Robert Bosch Gmbh Fuel injection device for an internal combustion engine has valve elements in a casing to work together with a valve seating and a fuel outlet regulated by a slide section
DE102006009659A1 (en) * 2005-07-25 2007-02-01 Robert Bosch Gmbh Fuel injection device for internal combustion engine, has valve unit arranged in housing and composed of several parts including control piston and nozzle needle, where piston and needle are coupled to each other via hydraulic coupler
DE102006021491A1 (en) 2006-05-09 2007-11-15 Robert Bosch Gmbh Fuel injector with directly operable nozzle needle

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