EP2715103A1 - Nozzle assembly for a fuel injector, and fuel injector - Google Patents

Nozzle assembly for a fuel injector, and fuel injector

Info

Publication number
EP2715103A1
EP2715103A1 EP12723468.0A EP12723468A EP2715103A1 EP 2715103 A1 EP2715103 A1 EP 2715103A1 EP 12723468 A EP12723468 A EP 12723468A EP 2715103 A1 EP2715103 A1 EP 2715103A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle needle
throttle
assembly according
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12723468.0A
Other languages
German (de)
French (fr)
Other versions
EP2715103B1 (en
Inventor
Andreas Koeninger
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 EP2715103A1 publication Critical patent/EP2715103A1/en
Application granted granted Critical
Publication of EP2715103B1 publication Critical patent/EP2715103B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly. State of the art
  • German Offenlegungsschrift DE 10 2009 001 704 A1 discloses a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with a generic nozzle assembly.
  • the nozzle assembly comprises an axially adjustable injection valve element with a combustion chamber near
  • the nozzle assembly further comprises a spring-loaded in the axial direction sleeve or disc, which is penetrated by the injection valve element and at least one throttle opening forming the closing throttle.
  • the proposed nozzle assembly comprises a nozzle needle, which is guided in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening via at least one guide portion and at least indirectly acted upon by the spring force of a closing spring, and a spring-loaded in the axial direction throttle bore body.
  • the throttle bore body bears against the nozzle needle and is acted upon in the axial direction by the spring force of the closing spring.
  • the throttle body is thus biased axially corresponding to the nozzle needle in the closing direction, so that it requires only a closing spring for biasing the nozzle needle and throttle body.
  • the spring force of the closing spring is transmitted via the throttle bore body to the nozzle needle.
  • the closing spring is preferably received in a first pressure chamber, which is in communication with a high pressure source.
  • the throttle bore body separates the first pressure chamber from a second pressure chamber, which communicates with the at least one injection port. Both pressure chambers are in turn connected via at least one throttle bore in the throttle bore body.
  • the at least one throttle bore has the effect that in the first pressure chamber, a hydraulic pressure pi and in the second
  • Pressure chamber act a hydraulic pressure p 2 , where pi> p 2 .
  • the hydraulic pressure i thus causes an additional hydraulic closing force, which supports the function of the closing spring.
  • the throttle bore body is formed like a piston and has an outer diameter D 1; which is larger than the outer diameter D 2 of the nozzle needle in the contact area with the throttle bore body. Due to the larger outer diameter, hydraulic active surfaces Ai and A 2 are preferably formed on both end faces of the piston-like throttle bore body, which delimit the two pressure chambers, via the latter
  • Size ratio can be effected in the axial direction of an effective hydraulic force, which additionally acts on the throttle bore body including the nozzle needle.
  • the ratio is preferably chosen such that the hydraulic effective area Ai delimiting the first pressure chamber is greater than the hydraulic effective area A 2 delimiting the second pressure chamber.
  • the throttle bore body further has at least one throttle bore, which is preferably designed as an axial bore.
  • An axial bore has the advantage over other throttle designs, such as inclined bores, that it has a lower temperature sensitivity.
  • the formation of at least one throttle bore as an axial bore is possible because the outer diameter Di of the piston-like throttle body is greater than the outer diameter D 2 of the nozzle needle.
  • the throttle bore body cooperate to guide the nozzle needle with a guide portion of the nozzle body.
  • the throttle bore body can cooperate with an axially spaced from the first guide portion formed second guide portion.
  • the leadership of the nozzle needle can be optimized so that the axial distance between the two guide sections is selected as large as possible.
  • the throttle bore body is located not only on the nozzle needle, but is integrally connected to the nozzle needle. The connection can be made for example by means of laser welding. In addition, alternatively or additionally, a non-positive or positive connection can be provided.
  • the one-piece connection of the throttle bore body with the nozzle needle, the assembly of the nozzle assembly can be simplified because fewer components are to be inserted into the nozzle body.
  • the centering of the nozzle needle is preferably carried out via the guide sections.
  • the throttle bore body is penetrated by the nozzle needle, wherein the throttle bore body penetrating portion of the nozzle needle has an outer diameter D 3 , which is smaller than the outer diameter D 2 of the nozzle needle.
  • the ratio of the outer diameter D 3 ⁇ D 2 ensures a hydraulic effective area ratio Ai> A 2 and thus an additional hydraulic force acting in the axial direction.
  • the nozzle needle By the nozzle needle through the throttle bore body through sets, the nozzle needle can be connected directly or indirectly via a plunger body with an actuator for actuating the nozzle needle.
  • the actuator may have an actuator ram, which is supported directly or indirectly on the nozzle needle.
  • the portion of the nozzle needle passing through the throttle body is a plunger body integrally connected to the nozzle needle.
  • the connection can be made for example by means of laser welding. Alternatively or additionally, a non-positive and / or positive connection can be selected.
  • plunger body may be the Aktorst Congressel or operatively connected to the Aktorst Congressel further plunger body. Since usually the outer diameter of the Aktorstsammlungels is smaller than the outer diameter D 2 of the nozzle needle is selected to effect a gain of the actuator force, it is further ensured that the hydraulic effective area ratio at the throttle body A- ⁇ A 2 is greater.
  • actuator plunger and nozzle needle are usually designed as two components, which must be assembled consuming during assembly. The proposed one-piece design therefore makes assembly easier.
  • the portion of the nozzle needle passing through the throttle bore body or the plunger body integrally connected to the nozzle needle is mounted radially floating in the throttle bore body.
  • the radially floating bearing bending loads on the nozzle needle or the plunger body can be prevented, which can be initiated for example due to lack of coaxiality of the components during assembly of the nozzle assembly in the nozzle needle or the plunger body.
  • the radially floating mounting can take place, for example, by providing an annular gap between the throttle bore body and the section of the nozzle needle or the plunger body passing through the throttle bore body.
  • the annular gap has a maximum outer diameter which is smaller than the outer diameter D 2 of the nozzle needle.
  • the annular gap is thus covered by an end face or a radially extending shoulder of the nozzle needle.
  • Drosseibohrungsisson is possibly no longer sufficient guidance of the nozzle needle guaranteed.
  • the section of the nozzle needle or the tappet body passing through the nozzle bore body is centered via an intermediate disk axially attached to the nozzle body.
  • the washer has an annular centering portion received in the nozzle body to facilitate assembly of the nozzle assembly.
  • a holding body is preferably attached axially and clamped axially with the nozzle body via a nozzle retaining nut.
  • the holding body may also be provided with an annular centering section, so that the assembly of nozzle assembly and holding body is simplified when the intermediate disk is omitted.
  • the fuel injector for injecting fuel into the combustion chamber of an internal combustion engine which has been proposed for solving the problem posed in the introduction comprises a nozzle assembly according to the invention and an actuator assembly for actuating the nozzle needle.
  • the nozzle needle via the Aktorbaueria is directly operable.
  • Direct actuation of the nozzle needle is understood here to mean an actuation in which the actuator force, for example via a hydraulic coupler, is possibly amplified.
  • the proposed nozzle assembly allows a fuel injector which is particularly compact in the axial direction and is also easy to assemble.
  • the functions guide / centering of the nozzle needle, closing throttle, sealing of the pressure chambers before / after the closing throttle and / or support of the spring force can be realized by a simple and therefore cost-effective component.
  • the component may have a throttle stepping for different application areas and be maintained according to the principle of a modular system.
  • the nozzle needle is connected to the plunger body and the closing spring and the Drosseibohrungsêt pushed onto the plunger body. Thereafter, the plunger body is inserted into the washer or a holding body. Finally, the nozzle body is connected to the intermediate disc and / or the holding body via a nozzle retaining nut.
  • FIG. 1 shows a longitudinal section through a first nozzle assembly according to the invention
  • FIG. 2 is a partial longitudinal section through a second nozzle assembly according to the invention. Detailed description of the drawings
  • the nozzle assembly shown in Figure 1 comprises a nozzle needle 1, which is guided in a high-pressure bore 2 of a nozzle body 3 in a liftable manner.
  • a nozzle needle 1 By way of the lifting movement of the nozzle needle 1, at least one injection opening 4 can be opened and closed, above which it is at high pressure
  • Fuel in the combustion chamber of an internal combustion engine can be injected.
  • the nozzle needle 1 is actuated via an actuator assembly, not shown.
  • the actuation of the nozzle needle 1 is carried out directly, possibly with the interposition of a hydraulic coupler.
  • the actuator assembly may include, for example, a magnetic actuator or a piezoelectric actuator.
  • two guide sections 5, 6 are formed in the nozzle body 3, which cooperate leading with corresponding portions of the nozzle needle 1.
  • the nozzle needle 1 In the region of the guide section 5, which is formed in the vicinity of a nozzle seat 13, the nozzle needle 1 has a section with an enlarged diameter, via which the nozzle needle 1 is guided in the guide section 5.
  • the enlarged diameter portion of the nozzle needle 1 has outer peripheral side polished portions to form flow passages for the fuel.
  • the polished sections are preferably uniformly distributed over the circumference of the nozzle needle 1.
  • Another guide section 6 is arranged at an axial distance from the guide section 5.
  • the guide section 6 cooperates with a throttle bore body 7, which is supported on a radially extending shoulder of the nozzle needle 1.
  • the throttle bore body 7 has an outer diameter Di, which is greater than the outer diameter D 2 of the nozzle needle 1 in the contact region with the throttle body 7 is.
  • the throttle bore body 7 may also be formed integrally with the nozzle needle 1.
  • the throttle body 7 is then formed by an enlarged diameter portion of the nozzle needle 1 or a throttle body 7 integrally connected to the nozzle needle 1.
  • the compound can be chosen such that a force, shape and / or material bond is effected.
  • At least one throttle bore 9 designed as an axial bore is formed in the throttle bore body 7, at least one throttle bore 9 designed as an axial bore is formed.
  • a first pressure chamber which is in communication with an inlet bore 16, and a second pressure chamber, which is in communication with the at least one injection aperture 4, are hydraulically connected in such a manner that the hydraulic fluid flows
  • Pressure pi in the first pressure chamber is greater than the hydraulic pressure p 2 in the second pressure chamber.
  • the hydraulic pressure pi in the first pressure chamber thus causes a force acting in the closing direction of the nozzle needle 1 on the throttle body 7 force, which acts to assist the needle closure.
  • the effect can be further enhanced by the hydraulic active surfaces formed on the throttle body 7.
  • the active hydraulic surfaces are designed in such a way that the hydraulic effective area delimiting the first pressure chamber is greater than the hydraulic effective area A 2 delimiting the second pressure chamber.
  • the closing direction of the throttle bore body 7 is further acted upon by the spring force of a closing spring 8, on the one hand on the throttle bore body
  • intermediate disc 1 1 is supported in the intermediate disc 1 1 or in the holding body 15 and the inlet bore 16 , which connects the first pressure chamber with a high-pressure source.
  • the intermediate plate 1 1 and the holding body 15 is axially attached to the nozzle body 3 and with this via a nozzle retaining nut (not shown) axially braced.
  • the second guide portion 6 extends substantially to the sealing surfaces 14 in order to ensure the largest possible axial distance between the two guide sections 5, 6, whereby the guide of the nozzle needle. 1 is optimized.
  • the guide portion 6 is limited only by the fact that the recorded in the first pressure chamber closing spring 8 limits the stroke of the throttle body 7.
  • the throttle body 7 is penetrated by a plunger body 10 which is integrally connected to the nozzle needle 1.
  • the connection 18 may in turn be a positive, positive and / or cohesive connection 18.
  • the plunger body 10 has an outer diameter D 3 , which is smaller than the outer diameter D 2 of the nozzle needle 1 is selected. This ensures a hydraulic effective area ratio Ai> A 2 .
  • the plunger body 10 serves the
  • Active connection of the nozzle needle 1 with the actuator assembly, not shown, wherein the active compound can also be produced via a coupler body and / or a coupler volume.
  • the assembly of the nozzle assembly is simplified. Over the two axially spaced guide portions 5, 6 an optimal guidance of the nozzle needle 1 in the nozzle body 3 is ensured.
  • the hydraulic active surfaces Ai and A 2 formed on the throttle body 7 cause due to their size ratio an additional hydraulic force acting in the axial direction.
  • FIG. 2 shows a modification of the embodiment of FIG. 1.
  • the nozzle needle 1 and the throttle bore body 7 are designed as separate components. This allows a radially floating mounting of the nozzle needle 1 in the region of the guide section 6. Due to the radially floating mounting of the nozzle needle 1, a bending stress of the nozzle needle 1 is avoided in the absence of coaxiality of the components zueinan-.
  • the nozzle needle 1 is integrally connected to a plunger body 10, wherein the plunger body 10 further is received in the washer 1 1 and the holding body 15.
  • the nozzle needle 1 thus experiences on the integrally connected plunger body 10, a further guide or centering, which can lead to a bending stress of the nozzle needle 1 in the absence of coaxiality of the components plunger body 10, nozzle needle 1 and throttle bore body 7. This can be counteracted by the nozzle needle 1 or the plunger body 10 integrally connected to the nozzle needle 1 being mounted radially floating in the throttle bore body 7.
  • an annular gap 17 is formed in the throttle body 7 in the present case.
  • the annular gap 17 is covered to the side of the second pressure chamber by an annular end face of the nozzle needle 1, so that no additional flow channel is provided, via which fuel can flow from the first pressure chamber into the second pressure chamber.
  • an annular centering 12 is formed on the washer 1 1 and on the holding body 15, with which the washer 1 1 and the holding body 15 is inserted into the high-pressure bore 2 of the nozzle body 3 can be.
  • a guide or centering of the nozzle needle 1 is further ensured in a seat remote area on the washer 1 1 and the holding body 15.

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 invention relates to a nozzle assembly for a fuel injector having a nozzle needle (1) which is guided with a reciprocating movement over at least one guide section (5, 6) in a high-pressure bore (2) of a nozzle body (3) for opening and closing at least one injection opening (4) and is loaded at least indirectly by the spring force of a closing spring (8), and having a restrictor-bore body (7) which is loaded by spring force in the axial direction. According to the invention, the restrictor-bore body (7) bears against the nozzle needle (1) and is loaded in the axial direction by the spring force of the closing spring (8). Furthermore, the invention relates to a fuel injector having a nozzle assembly of this type.

Description

Beschreibung  description
Titel title
Düsenbauqruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor Die Erfindung betrifft eine Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1 . Ferner betrifft die Erfindung einen Kraftstoffinjektor mit einer solchen Düsenbaugruppe. Stand der Technik  The invention relates to a nozzle assembly for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly. State of the art
Aus der Offenlegungsschrift DE 10 2009 001 704 A1 ist ein Kraftstoff-Injektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine mit eienr gattungsgemäßen Düsenbaugruppe bekannt. Die Düsenbaugruppe um- fasst ein axial verstellbares Einspritzventilelement mit einem brennraumnahenGerman Offenlegungsschrift DE 10 2009 001 704 A1 discloses a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with a generic nozzle assembly. The nozzle assembly comprises an axially adjustable injection valve element with a combustion chamber near
Abschnitt, welcher in einen Düsenraum ragt, in den Kraftstoff durch eine Schließdrossel strömen kann. Um eine einfache, toleranz- und temperaturunempfindliche Schließdrosselausbildung und -anordnung anzugeben, umfasst die Düsenbaugruppe ferner eine in axialer Richtung federkraftbeaufschlagte Hülse oder Scheibe, welche von dem Einspritzventilelement durchsetzt ist und mindestens eine die Schließdrossel bildende Drosselbohrung aufweist. Section, which projects into a nozzle chamber, can flow into the fuel through a closing throttle. In order to provide a simple, tolerance and temperature-insensitive closing throttle formation and arrangement, the nozzle assembly further comprises a spring-loaded in the axial direction sleeve or disc, which is penetrated by the injection valve element and at least one throttle opening forming the closing throttle.
Ausgehend von dem vorstehend genannten Stand der Technik ist es Aufgabe der vorliegenden Erfindung, eine funktions- und fertigungsoptimierte Düsenbau- gruppe, insbesondere für direktgeschaltete Dieseleinspritzinjektoren, anzugeben. Based on the above-mentioned prior art, it is an object of the present invention to provide a functional and production-optimized nozzle assembly, in particular for directly switched diesel injection injectors.
Die Aufgabe wird gelöst durch eine Düsenbaugruppe mit den Merkmalen des Anspruchs 1 . Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Zur Lösung der Aufgabe wird ferner ein Kraftstoffinjektor mit den Merkmalen des Anspruchs 10 vorgeschlagen. Offenbarung der Erfindung The object is achieved by a nozzle assembly having the features of claim 1. Advantageous developments of the invention are specified in the subclaims. To solve the problem, a fuel injector with the features of claim 10 is also proposed. Disclosure of the invention
Die vorgeschlagene Düsenbaugruppe umfasst eine Düsennadel, die in einer Hochdruckbohrung eines Düsenkörpers zum Freigeben und Verschließen we- nigstens einer Einspritzöffnung über wenigstens einen Führungsabschnitt hubbeweglich geführt und zumindest mittelbar von der Federkraft einer Schließfeder beaufschlagt ist, sowie einen in axialer Richtung federkraftbeaufschlagten Drosselbohrungskörper. Erfindungsgemäß liegt der Drosselbohrungskörper an der Düsennadel an und ist in axialer Richtung von der Federkraft der Schließfeder beaufschlagt. Der Drosselbohrungskörper ist somit entsprechend der Düsennadel in Schließrichtung axial vorgespannt, so dass es zur Vorspannung von Düsennadel und Drosselbohrungskörper lediglich einer Schließfeder bedarf. Die Federkraft der Schließfeder wird über den Drosselbohrungskörper auf die Düsennadel übertragen. Die Schließfeder ist dabei bevorzugt in einem ersten Druckraum aufgenommen, welcher in Verbindung mit einer Hochdruckquelle steht. Der Drosselbohrungskörper trennt den ersten Druckraum von einem zweiten Druckraum, welcher in Verbindung mit der wenigstens einen Einspritzöffnung steht. Beide Druckräume sind wiederum über wenigstens eine Drosselbohrung im Drosselbohrungskörper verbunden. Die wenigstens eine Drosselbohrung hat den Effekt, dass im ersten Druckraum ein hydraulischer Druck pi und im zweitenThe proposed nozzle assembly comprises a nozzle needle, which is guided in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening via at least one guide portion and at least indirectly acted upon by the spring force of a closing spring, and a spring-loaded in the axial direction throttle bore body. According to the invention, the throttle bore body bears against the nozzle needle and is acted upon in the axial direction by the spring force of the closing spring. The throttle body is thus biased axially corresponding to the nozzle needle in the closing direction, so that it requires only a closing spring for biasing the nozzle needle and throttle body. The spring force of the closing spring is transmitted via the throttle bore body to the nozzle needle. The closing spring is preferably received in a first pressure chamber, which is in communication with a high pressure source. The throttle bore body separates the first pressure chamber from a second pressure chamber, which communicates with the at least one injection port. Both pressure chambers are in turn connected via at least one throttle bore in the throttle bore body. The at least one throttle bore has the effect that in the first pressure chamber, a hydraulic pressure pi and in the second
Druckraum ein hydraulischer Druck p2 wirken, wobei p-i > p2 ist. Der hydraulische Druck i bewirkt demnach eine zusätzliche hydraulische Schließkraft, welche die Funktion der Schließfeder unterstützt. Vorzugsweise ist der Drosselbohrungskörper kolbenartig ausgebildet und besitzt einen Außendurchmesser D1 ; der größer als der Außendurchmesser D2 der Düsennadel im Kontaktbereich mit dem Drosselbohrungskörper ist. Aufgrund des größeren Außendurchmessers werden vorzugsweise an beiden Stirnflächen des kolbenartig ausgebildeten Drosselbohrungskörpers, welche die beiden Druck- räume begrenzen, hydraulische Wirkflächen Ai und A2 ausgebildet, über derenPressure chamber act a hydraulic pressure p 2 , where pi> p 2 . The hydraulic pressure i thus causes an additional hydraulic closing force, which supports the function of the closing spring. Preferably, the throttle bore body is formed like a piston and has an outer diameter D 1; which is larger than the outer diameter D 2 of the nozzle needle in the contact area with the throttle bore body. Due to the larger outer diameter, hydraulic active surfaces Ai and A 2 are preferably formed on both end faces of the piston-like throttle bore body, which delimit the two pressure chambers, via the latter
Größenverhältnis eine in axialer Richtung wirksame hydraulische Kraft bewirkbar ist, welche den Drosselbohrungskörper einschließlich der Düsennadel zusätzlich beaufschlagt. Das Verhältnis ist vorzugsweise derart gewählt, dass die den ersten Druckraum begrenzende hydraulische Wirkfläche A-i größer als die den zwei- ten Druckraum begrenzende hydraulische Wirkfläche A2 ist. Der Drosselbohrungskörper besitzt ferner wenigstens eine Drosselbohrung, die vorzugsweise als Axialbohrung ausgeführt ist. Eine Axialbohrung weist gegenüber anderen Drosselausführungen, wie beispielsweise Schrägbohrungen, den Vorteil auf, dass sie eine geringere Temperatursensitivität besitzt. Die Ausbildung der wenigstens einen Drosselbohrung als Axialbohrung ist möglich, da der Außendurchmesser Di des kolbenartig ausgeführten Drosselbohrungskörpers größer als der Außendurchmesser D2 der Düsennadel ist. Size ratio can be effected in the axial direction of an effective hydraulic force, which additionally acts on the throttle bore body including the nozzle needle. The ratio is preferably chosen such that the hydraulic effective area Ai delimiting the first pressure chamber is greater than the hydraulic effective area A 2 delimiting the second pressure chamber. The throttle bore body further has at least one throttle bore, which is preferably designed as an axial bore. An axial bore has the advantage over other throttle designs, such as inclined bores, that it has a lower temperature sensitivity. The formation of at least one throttle bore as an axial bore is possible because the outer diameter Di of the piston-like throttle body is greater than the outer diameter D 2 of the nozzle needle.
Des Weiteren wird vorgeschlagen, dass der Drosselbohrungskörper zur Führung der Düsennadel mit einem Führungsabschnitt des Düsenkörpers zusammenwirkt. Neben einem ersten Führungsabschnitt, der vorzugsweise über eine als Stufenbohrung im Düsenkörper ausgeführte Hochdruckbohrung ausgebildet wird und mit einem Abschnitt der Düsennadel zusammenwirkt, welcher einen vergrößerten Durchmesser besitzt, kann der Drosselbohrungskörper mit einem axial beabstandet zum ersten Führungsabschnitt ausgebildeten zweiten Führungsabschnitt zusammenwirken. Die Führung der Düsennadel kann dadurch optimiert werden, dass der axiale Abstand der beiden Führungsabschnitte möglichst groß gewählt wird. Gemäß einer Weiterbildung der Erfindung, liegt der Drosselbohrungskörper nicht nur an der Düsennadel an, sondern ist mit der Düsennadel einstückig verbunden. Die Verbindung kann beispielsweise mittels Laserschweißens erfolgen. Darüber hinaus kann alternativ oder ergänzend auch eine kraft- oder formschlüssige Verbindung vorgesehen sein. Durch die einstückige Verbindung des Drosselboh- rungskörpers mit der Düsennadel kann die Montage der Düsenbaugruppe vereinfacht werden, da weniger Bauteile in den Düsenkörper einzusetzen sind. Die Zentrierung der Düsennadel erfolgt dabei bevorzugt über die Führungsabschnitte. Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung ist der Drosselbohrungskörper von der Düsennadel durchsetzt, wobei der den Drosselbohrungskörper durchsetzende Abschnitt der Düsennadel einen Außendurchmesser D3 besitzt, der kleiner als der Außendurchmesser D2 der Düsennadel ist. Das Verhältnis der Außendurchmesser D3 < D2 gewährleistet ein hydraulisches Wirk- flächenverhältnis Ai >A2 und damit eine zusätzliche in axialer Richtung wirkende hydraulische Kraft. Indem die Düsennadel den Drosselbohrungskörper durch- setzt, kann die Düsennadel direkt oder indirekt über einen Stößelkörper mit einem Aktor zur Betätigung der Düsennadel verbunden werden. Beispielsweise kann der Aktor einen Aktorstößel aufweisen, der unmittelbar oder mittelbar an der Düsennadel abgestützt ist. Furthermore, it is proposed that the throttle bore body cooperate to guide the nozzle needle with a guide portion of the nozzle body. In addition to a first guide portion, which is preferably formed as a stepped bore in the nozzle body high pressure bore and cooperates with a portion of the nozzle needle having an enlarged diameter, the throttle bore body can cooperate with an axially spaced from the first guide portion formed second guide portion. The leadership of the nozzle needle can be optimized so that the axial distance between the two guide sections is selected as large as possible. According to one embodiment of the invention, the throttle bore body is located not only on the nozzle needle, but is integrally connected to the nozzle needle. The connection can be made for example by means of laser welding. In addition, alternatively or additionally, a non-positive or positive connection can be provided. The one-piece connection of the throttle bore body with the nozzle needle, the assembly of the nozzle assembly can be simplified because fewer components are to be inserted into the nozzle body. The centering of the nozzle needle is preferably carried out via the guide sections. According to a further preferred embodiment of the invention, the throttle bore body is penetrated by the nozzle needle, wherein the throttle bore body penetrating portion of the nozzle needle has an outer diameter D 3 , which is smaller than the outer diameter D 2 of the nozzle needle. The ratio of the outer diameter D 3 <D 2 ensures a hydraulic effective area ratio Ai> A 2 and thus an additional hydraulic force acting in the axial direction. By the nozzle needle through the throttle bore body through sets, the nozzle needle can be connected directly or indirectly via a plunger body with an actuator for actuating the nozzle needle. For example, the actuator may have an actuator ram, which is supported directly or indirectly on the nozzle needle.
Vorteilhafterweise ist der den Drosselbohrungskörper durchsetzende Abschnitt der Düsennadel ein Stößelkörper, der einstückig mit der Düsennadel verbunden ist. Die Verbindung kann beispielsweise mittels Laserschweißens erfolgen. Alternativ oder ergänzend kann auch eine kraft- und/oder formschlüssige Verbindung gewählt werden. Bei dem einstückig mit der Düsennadel verbundenen Stößelkörper kann es sich um den Aktorstößel handeln oder einen mit dem Aktorstößel wirkverbundenen weiteren Stößelkörper. Da in der Regel der Außendurchmesser des Aktorstößels kleiner als der Außendurchmesser D2 der Düsennadel gewählt ist, um eine Verstärkung der Aktorkraft zu bewirken, ist weiterhin gewährleistet, dass das hydraulische Wirkflächenverhältnis am Drosselbohrungskörper A-\ größer A2 ist. Bei herkömmlichen, insbesondere direkt geschalteten Injektoren, sind Aktorstößel und Düsennadel in der Regel als zwei Bauteile ausgeführt, welche bei der Montage aufwändig zusammengefügt werden müssen. Durch die vorgeschlagene einstückige Ausbildung kann demnach die Montage vereinfacht wer- den. Advantageously, the portion of the nozzle needle passing through the throttle body is a plunger body integrally connected to the nozzle needle. The connection can be made for example by means of laser welding. Alternatively or additionally, a non-positive and / or positive connection can be selected. In the integrally connected to the nozzle needle plunger body may be the Aktorstößel or operatively connected to the Aktorstößel further plunger body. Since usually the outer diameter of the Aktorstößels is smaller than the outer diameter D 2 of the nozzle needle is selected to effect a gain of the actuator force, it is further ensured that the hydraulic effective area ratio at the throttle body A- \ A 2 is greater. In conventional, especially directly connected injectors, actuator plunger and nozzle needle are usually designed as two components, which must be assembled consuming during assembly. The proposed one-piece design therefore makes assembly easier.
Gemäß einer alternativen Ausführungsform der Erfindung ist vorgesehen, dass der den Drosselbohrungskörper durchsetzende Abschnitt der Düsennadel bzw. der einstückig mit der Düsennadel verbundenen Stößelkörper radial schwim- mend im Drosselbohrungskörper gelagert ist. Durch die radial schwimmende Lagerung können Biegebelastungen auf die Düsennadel bzw. den Stößelkörper verhindert werden, die beispielsweise aufgrund fehlender Koaxialität der Bauteile bei der Montage der Düsenbaugruppe in die Düsennadel bzw. den Stößelkörper eingeleitet werden können. Die radial schwimmende Lagerung kann beispiels- weise dadurch erfolgen, dass ein Ringspalt zwischen Drosselbohrungskörper und den Drosselbohrungskörper durchsetzenden Abschnitt der Düsennadel bzw. dem Stößelkörper vorgesehen ist. Vorzugsweise weist der Ringspalt einen maximalen Außendurchmesser auf, der kleiner als der Außendurchmesser D2 der Düsennadel ist. Der Ringspalt wird somit von einer Stirnfläche bzw. einem radial verlaufenden Absatz der Düsennadel überdeckt. Bei radial schwimmender Lagerung der Düsennadel im Drosseibohrungskörper ist ggf. keine ausreichende Führung der Düsennadel mehr gewährleistet. Um eine weitere Führung bzw. Zentrierung der Düsennadel sicherzustellen, wird gemäß einer Weiterbildung vorgeschlagen, dass der den Drosseibohrungskörper durchsetzende Abschnitt der Düsennadel bzw. der Stößelkörper über eine axial an den Düsenkörper angesetzte Zwischenscheibe zentriert ist. Vorzugsweise besitzt die Zwischenscheibe einen im Düsenkörper aufgenommenen ringförmigen Zentrierabschnitt, um die Montage der Düsenbaugruppe zu erleichtern. An die Zwischenscheibe ist vorzugsweise ein Haltekörper axial angesetzt und mit dem Düsenkörper über eine Düsenspannmutter axial verspannt. Alternativ kann anstelle der Zwischenscheibe auch der Haltekörper mit einem ringförmigen Zentrierabschnitt versehen sein, so dass bei Wegfall der Zwischenscheibe die Montage von Düsenbaugruppe und Haltekörper vereinfacht wird. According to an alternative embodiment of the invention, it is provided that the portion of the nozzle needle passing through the throttle bore body or the plunger body integrally connected to the nozzle needle is mounted radially floating in the throttle bore body. By the radially floating bearing bending loads on the nozzle needle or the plunger body can be prevented, which can be initiated for example due to lack of coaxiality of the components during assembly of the nozzle assembly in the nozzle needle or the plunger body. The radially floating mounting can take place, for example, by providing an annular gap between the throttle bore body and the section of the nozzle needle or the plunger body passing through the throttle bore body. Preferably, the annular gap has a maximum outer diameter which is smaller than the outer diameter D 2 of the nozzle needle. The annular gap is thus covered by an end face or a radially extending shoulder of the nozzle needle. In radially floating storage of the nozzle needle in Drosseibohrungskörper is possibly no longer sufficient guidance of the nozzle needle guaranteed. In order to ensure a further guidance or centering of the nozzle needle, it is proposed according to a development that the section of the nozzle needle or the tappet body passing through the nozzle bore body is centered via an intermediate disk axially attached to the nozzle body. Preferably, the washer has an annular centering portion received in the nozzle body to facilitate assembly of the nozzle assembly. To the intermediate disc, a holding body is preferably attached axially and clamped axially with the nozzle body via a nozzle retaining nut. Alternatively, instead of the intermediate disk, the holding body may also be provided with an annular centering section, so that the assembly of nozzle assembly and holding body is simplified when the intermediate disk is omitted.
Der Ferner zur Lösung der Eingangs gestellten Aufgabe vorgeschlagene Kraft- stoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine umfasst eine erfindungsgemäße Düsenbaugruppe sowie eine Aktorbaugruppe zur Betätigung der Düsennadel. Vorzugsweise ist die Düsennadel über die Aktorbaugruppe direkt betätigbar. Unter direkter Betätigung der Düsennadel wird vorliegend eine Betätigung verstanden, bei welcher die Aktorkraft, beispielsweise über einen hydraulischen Koppler, ggf. verstärkt wird. Die vorgeschlagene Düsenbaugruppe ermöglicht einen insbesondere in axialer Richtung kompaktbauenden Kraftstoffinjektor, der zudem einfach zu montieren ist. Ferner können die Funktionen Führung/Zentrierung der Düsennadel, Schließdrossel, Abdichtung der Druckräume vor/nach der Schließdrossel und/oder Abstützung der Federkraft durch ein einfaches und damit kostengünstiges Bauteil realisiert werden. Das Bauteil kann eine Drosselabstufung für verschiedene Applikationsbereiche aufweisen und nach dem Prinzip eines Baukastens vorgehalten werden. Zur Montage des Bauteils wird die Düsennadel mit dem Stößelkörper verbunden und die Schließfeder und der Drosseibohrungskörper auf den Stößelkörper aufgeschoben. Danach wird der Stößelkörper in die Zwischenscheibe oder einen Haltekörper eingesteckt. Abschließend wird der Düsenkörper mit der Zwischenscheibe und/oder dem Haltekörper über eine Düsenspannmutter verbunden. Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: The fuel injector for injecting fuel into the combustion chamber of an internal combustion engine which has been proposed for solving the problem posed in the introduction comprises a nozzle assembly according to the invention and an actuator assembly for actuating the nozzle needle. Preferably, the nozzle needle via the Aktorbaugruppe is directly operable. Direct actuation of the nozzle needle is understood here to mean an actuation in which the actuator force, for example via a hydraulic coupler, is possibly amplified. The proposed nozzle assembly allows a fuel injector which is particularly compact in the axial direction and is also easy to assemble. Furthermore, the functions guide / centering of the nozzle needle, closing throttle, sealing of the pressure chambers before / after the closing throttle and / or support of the spring force can be realized by a simple and therefore cost-effective component. The component may have a throttle stepping for different application areas and be maintained according to the principle of a modular system. To assemble the component, the nozzle needle is connected to the plunger body and the closing spring and the Drosseibohrungskörper pushed onto the plunger body. Thereafter, the plunger body is inserted into the washer or a holding body. Finally, the nozzle body is connected to the intermediate disc and / or the holding body via a nozzle retaining nut. Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
Figur 1 einen Längsschnitt durch eine erste erfindungsgemäße Düsenbau- gruppe und 1 shows a longitudinal section through a first nozzle assembly according to the invention and
Figur 2 einen ausschnittsweisen Längsschnitt durch eine zweite erfindungsgemäße Düsenbaugruppe. Ausführliche Beschreibung der Zeichnungen Figure 2 is a partial longitudinal section through a second nozzle assembly according to the invention. Detailed description of the drawings
Die in der Figur 1 dargestellte Düsenbaugruppe umfasst eine Düsennadel 1 , welche in einer Hochdruckbohrung 2 eines Düsenkörpers 3 hubbeweglich geführt ist. Über die Hubbewegung der Düsennadel 1 ist wenigstens eine Einspritzöff- nung 4 freigebbar und verschließbar, über welche unter hohem Druck stehenderThe nozzle assembly shown in Figure 1 comprises a nozzle needle 1, which is guided in a high-pressure bore 2 of a nozzle body 3 in a liftable manner. By way of the lifting movement of the nozzle needle 1, at least one injection opening 4 can be opened and closed, above which it is at high pressure
Kraftstoff in den Brennraum einer Brennkraftmaschine (nicht dargestellt) einspritzbar ist. Die Düsennadel 1 wird über eine nicht dargestellte Aktorbaugruppe betätigt. Vorzugsweise erfolgt die Betätigung der Düsennadel 1 direkt, ggf. unter Zwischenschaltung eines hydraulischen Kopplers. Die Aktorbaugruppe kann beispielsweise einen Magnetaktor oder einen Piezoaktor umfassen. Fuel in the combustion chamber of an internal combustion engine (not shown) can be injected. The nozzle needle 1 is actuated via an actuator assembly, not shown. Preferably, the actuation of the nozzle needle 1 is carried out directly, possibly with the interposition of a hydraulic coupler. The actuator assembly may include, for example, a magnetic actuator or a piezoelectric actuator.
Zur Führung der Düsennadel 1 sind im Düsenkörper 3 zwei Führungsabschnitte 5, 6 ausgebildet, welche mit entsprechenden Abschnitten an der Düsennadel 1 führend zusammenwirken. Im Bereich des Führungsabschnitts 5, welcher in der Nähe eines Düsensitzes 13 ausgebildet ist, weist die Düsennadel 1 einen Abschnitt mit vergrößertem Durchmesser auf, über welchen die Düsennadel 1 im Führungsabschnitt 5 geführt ist. Der Abschnitt mit vergrößertem Durchmesser der Düsennadel 1 weist außenumfangsseitig Anschliffe auf, um Durchströmkanäle für den Kraftstoff auszubilden. Vorzugsweise sind die Anschliffe über den Um- fang der Düsennadel 1 gleichmäßig verteilt ausgebildet. Ein weiterer Führungsabschnitt 6 ist in axialem Abstand zum Führungsabschnitt 5 angeordnet. Hier wirkt der Führungsabschnitt 6 mit einem Drosselbohrungskörper 7 zusammen, welcher an einem radial verlaufenden Absatz der Düsennadel 1 abgestützt ist. Der Drosselbohrungskörper 7 weist einen Außendurchmesser Di auf, welcher größer als der Außendurchmesser D2 der Düsennadel 1 im Kontaktbereich mit dem Drosselbohrungskörper 7 ist. Dadurch ist die Führungsfunktion des Drosselbohrungskörpers 7 gewährleistet. To guide the nozzle needle 1, two guide sections 5, 6 are formed in the nozzle body 3, which cooperate leading with corresponding portions of the nozzle needle 1. In the region of the guide section 5, which is formed in the vicinity of a nozzle seat 13, the nozzle needle 1 has a section with an enlarged diameter, via which the nozzle needle 1 is guided in the guide section 5. The enlarged diameter portion of the nozzle needle 1 has outer peripheral side polished portions to form flow passages for the fuel. The polished sections are preferably uniformly distributed over the circumference of the nozzle needle 1. Another guide section 6 is arranged at an axial distance from the guide section 5. Here, the guide section 6 cooperates with a throttle bore body 7, which is supported on a radially extending shoulder of the nozzle needle 1. The throttle bore body 7 has an outer diameter Di, which is greater than the outer diameter D 2 of the nozzle needle 1 in the contact region with the throttle body 7 is. As a result, the guiding function of the throttle body 7 is ensured.
Gemäß einer alternativen Ausführungsform der Erfindung kann der Drosselboh- rungskörper 7 auch einstückig mit der Düsennadel 1 ausgebildet sein. Der Drosselbohrungskörper 7 wird dann durch einen Abschnitt mit vergrößertem Durchmesser der Düsennadel 1 oder einem mit der Düsennadel 1 einstückig verbundenen Drosselbohrungskörper 7 gebildet. Die Verbindung kann derart gewählt sein, dass ein Kraft-, Form- und/oder Stoffschluss bewirkt wird. According to an alternative embodiment of the invention, the throttle bore body 7 may also be formed integrally with the nozzle needle 1. The throttle body 7 is then formed by an enlarged diameter portion of the nozzle needle 1 or a throttle body 7 integrally connected to the nozzle needle 1. The compound can be chosen such that a force, shape and / or material bond is effected.
Im Drosselbohrungskörper 7 ist wenigstens eine als Axialbohrung ausgeführte Drosselbohrung 9 ausgebildet. Über die wenigstens eine Drosselbohrung 9 werden ein erster, in Verbindung mit einer Zulaufbohrung 16 stehender Druckraum und ein zweiter, in Verbindung mit der wenigstens einen Einspritzöffnung 4 ste- hender Druckraum in der Weise hydraulisch verbunden, dass der hydraulischeIn the throttle bore body 7, at least one throttle bore 9 designed as an axial bore is formed. By way of the at least one throttle bore 9, a first pressure chamber, which is in communication with an inlet bore 16, and a second pressure chamber, which is in communication with the at least one injection aperture 4, are hydraulically connected in such a manner that the hydraulic fluid flows
Druck pi im ersten Druckraum größer als der hydraulische Druck p2 im zweiten Druckraum ist. Der hydraulische Druck pi im ersten Druckraum bewirkt demzufolge eine in Schließrichtung der Düsennadel 1 auf den Drosselbohrungskörper 7 wirkende Kraft, welche beim Nadelschließen unterstützend wirkt. Der Effekt kann durch die am Drosselbohrungskörper 7 ausgebildeten hydraulischen Wirkflächen noch verstärkt werden. Vorliegend sind die hydraulischen Wirkflächen derart gestaltet, dass die den ersten Druckraum begrenzende hydraulische Wirkfläche größer als die den zweiten Druckraum begrenzende hydraulische Wirkfläche A2 ist. In Schließrichtung wird der Drosselbohrungskörper 7 ferner von der Feder- kraft einer Schließfeder 8 beaufschlagt, die einerseits am DrosselbohrungskörperPressure pi in the first pressure chamber is greater than the hydraulic pressure p 2 in the second pressure chamber. The hydraulic pressure pi in the first pressure chamber thus causes a force acting in the closing direction of the nozzle needle 1 on the throttle body 7 force, which acts to assist the needle closure. The effect can be further enhanced by the hydraulic active surfaces formed on the throttle body 7. In the present case, the active hydraulic surfaces are designed in such a way that the hydraulic effective area delimiting the first pressure chamber is greater than the hydraulic effective area A 2 delimiting the second pressure chamber. In the closing direction of the throttle bore body 7 is further acted upon by the spring force of a closing spring 8, on the one hand on the throttle bore body
7 andererseits an einem Haltekörper 15 bzw. einer zwischen Haltekörper 15 und dem Düsenkörper 3 angeordneten Zwischenscheibe 1 1 abgestützt ist. In der Zwischenscheibe 1 1 bzw. im Haltekörper 15 ist auch die Zulaufbohrung 16 ausgebildet, welche den ersten Druckraum mit einer Hochdruckquelle verbindet. Die Zwischenscheibe 1 1 bzw. der Haltekörper 15 ist axial an den Düsenkörper 3 angesetzt und mit diesem über eine Düsenspannmutter (nicht dargestellt) axial verspannt. Die aneinander liegenden Stirnflächen bilden Dichtflächen 14 aus, über welche der erste Druckraum gegenüber der Umgebung hochdruckfest abgedichtet ist. Der zweite Führungsabschnitt 6 erstreckt sich im Wesentlichen bis an die Dichtflächen 14, um einen möglichst großen axialen Abstand der beiden Führungsabschnitte 5, 6 zu gewährleisten, wodurch die Führung der Düsennadel 1 optimiert wird. Der Führungsabschnitt 6 wird lediglich dadurch begrenzt, dass die im ersten Druckraum aufgenommene Schließfeder 8 den Hub des Drosselbohrungskörpers 7 beschränkt. Der Drosselbohrungskörper 7 wird von einem Stößelkörper 10 durchsetzt, welcher mit der Düsennadel 1 einstückig verbunden ist. Die Verbindung 18 kann wiederum eine kraft-, form- und/oder stoffschlüssige Verbindung 18 sein. Der Stößelkörper 10 weist einen Außendurchmesser D3 auf, welcher kleiner als der Außendurchmesser D2 der Düsennadel 1 gewählt ist. Dadurch ist ein hydrauli- sches Wirkflächenverhältnis Ai > A2 sichergestellt. Der Stößelkörper 10 dient der7 on the other hand on a holding body 15 and an arranged between the holding body 15 and the nozzle body 3 intermediate disc 1 1 is supported. In the intermediate disc 1 1 or in the holding body 15 and the inlet bore 16 is formed, which connects the first pressure chamber with a high-pressure source. The intermediate plate 1 1 and the holding body 15 is axially attached to the nozzle body 3 and with this via a nozzle retaining nut (not shown) axially braced. The abutting end faces form sealing surfaces 14, via which the first pressure chamber is sealed against high pressure in relation to the environment. The second guide portion 6 extends substantially to the sealing surfaces 14 in order to ensure the largest possible axial distance between the two guide sections 5, 6, whereby the guide of the nozzle needle. 1 is optimized. The guide portion 6 is limited only by the fact that the recorded in the first pressure chamber closing spring 8 limits the stroke of the throttle body 7. The throttle body 7 is penetrated by a plunger body 10 which is integrally connected to the nozzle needle 1. The connection 18 may in turn be a positive, positive and / or cohesive connection 18. The plunger body 10 has an outer diameter D 3 , which is smaller than the outer diameter D 2 of the nozzle needle 1 is selected. This ensures a hydraulic effective area ratio Ai> A 2 . The plunger body 10 serves the
Wirkverbindung der Düsennadel 1 mit der nicht dargestellten Aktorbaugruppe, wobei die Wirkverbindung auch über einen Kopplerkörper und/oder ein Kopplervolumen herstellbar ist. Bei dem in der Figur 1 dargestellten Ausführungsbeispiel einer erfindungsgemäßen Düsenbaugruppe werden die Funktionen Führung/Zentrierung, Schließdrossel, Abdichtung der Druckräume vor/nach der Schließdrossel und Abstützung der Federkraft in einem einzigen Bauteil realisiert. Dieses Bauteil ist zudem einfach und kostengünstig herstellbar. Ferner wird die Montage der Düsenbaugruppe vereinfacht. Über die beiden axial beabstandeten Führungsabschnitte 5, 6 ist eine optimale Führung der Düsennadel 1 im Düsenkörper 3 gewährleistet. Ferner bewirken die am Drosselbohrungskörper 7 ausgebildeten hydraulischen Wirkflächen A-i und A2 aufgrund ihres Größenverhältnisses eine zusätzliche in axialer Richtung wirkende hydraulische Kraft. Gleiches gilt in Bezug auf die wenigstens eine im Drosselbohrungskörper 7 ausgebildete Drosselbohrung 9, welche vorzugsweise als Axialbohrung ausgeführt ist. Auf diese Weise wird eine funktions- und fertigungsoptimierte Düsenbaugruppe geschaffen. Active connection of the nozzle needle 1 with the actuator assembly, not shown, wherein the active compound can also be produced via a coupler body and / or a coupler volume. In the embodiment of a nozzle assembly according to the invention shown in Figure 1, the functions guide / centering, closing throttle, sealing the pressure chambers before / after the closing throttle and support the spring force in a single component realized. This component is also easy and inexpensive to produce. Furthermore, the assembly of the nozzle assembly is simplified. Over the two axially spaced guide portions 5, 6 an optimal guidance of the nozzle needle 1 in the nozzle body 3 is ensured. Furthermore, the hydraulic active surfaces Ai and A 2 formed on the throttle body 7 cause due to their size ratio an additional hydraulic force acting in the axial direction. The same applies with respect to the at least one throttle bore formed in the throttle body 7 7, which is preferably designed as an axial bore. In this way, a function and production optimized nozzle assembly is created.
Figur 2 zeigt eine Abwandlung der Ausführungsform der Figur 1 . Im Unterschied zur Ausführungsform der Figur 1 sind vorliegend die Düsennadel 1 und der Drosselbohrungskörper 7 als separate Bauteile ausgeführt. Dies ermöglicht eine radial schwimmende Lagerung der Düsennadel 1 im Bereich des Führungsabschnitts 6. Durch die radial schwimmende Lagerung der Düsennadel 1 wird eine Biegebeanspruchung der Düsennadel 1 bei fehlender Koaxialität der Bauteile zueinan- der vermieden. Auch im Ausführungsbeispiel der Figur 2 ist die Düsennadel 1 mit einem Stößelkörper 10 einstückig verbunden, wobei der Stößelkörper 10 ferner in der Zwischenscheibe 1 1 bzw. dem Haltekörper 15 aufgenommen ist. Die Düsennadel 1 erfährt somit über den einstückig verbundenen Stößelkörper 10 eine weitere Führung bzw. Zentrierung, welche bei fehlender Koaxialität der Bauteile Stößelkörper 10, Düsennadel 1 und Drosselbohrungskörper 7 zu einer Biegebeanspruchung der Düsennadel 1 führen kann. Dem kann dadurch entgegengewirkt werden, dass die Düsennadel 1 bzw. der einstückig mit der Düsennadel 1 verbundene Stößelkörper 10 radial schwimmend im Drosselbohrungskörper 7 gelagert ist. Zur radial schwimmenden Lagerung der Düsennadel 1 bzw. des Stößelkörpers 10 ist im Drosselbohrungskörper 7 vorliegend ein Ringspalt 17 ausgebildet. Der Ringspalt 17 wird zur Seite des zweiten Druckraumes hin von einer ringförmigen Stirnfläche der Düsennadel 1 überdeckt, so dass kein zusätzlicher Strömungskanal geschaffen wird, über welchen Kraftstoff aus dem ersten Druckraum in den zweiten Druckraum strömen kann. Um die Zentrierung der Düsennadel 1 bzw. des Stößelkörpers 10 zu erleichtern, ist an der Zwischenscheibe 1 1 bzw. am Haltekörper 15 ein ringförmiger Zentrierabschnitt 12 ausgebildet, mit welchem die Zwischenscheibe 1 1 bzw. der Haltekörper 15 in die Hochdruckbohrung 2 des Düsenkörpers 3 eingesetzt werden kann. Insofern ist über die Zwischenscheibe 1 1 bzw. den Haltekörper 15 weiterhin eine Führung bzw. Zentrierung der Düsennadel 1 in einem sitzfernen Bereich gewährleistet. FIG. 2 shows a modification of the embodiment of FIG. 1. In contrast to the embodiment of Figure 1, in the present case, the nozzle needle 1 and the throttle bore body 7 are designed as separate components. This allows a radially floating mounting of the nozzle needle 1 in the region of the guide section 6. Due to the radially floating mounting of the nozzle needle 1, a bending stress of the nozzle needle 1 is avoided in the absence of coaxiality of the components zueinan-. Also in the embodiment of Figure 2, the nozzle needle 1 is integrally connected to a plunger body 10, wherein the plunger body 10 further is received in the washer 1 1 and the holding body 15. The nozzle needle 1 thus experiences on the integrally connected plunger body 10, a further guide or centering, which can lead to a bending stress of the nozzle needle 1 in the absence of coaxiality of the components plunger body 10, nozzle needle 1 and throttle bore body 7. This can be counteracted by the nozzle needle 1 or the plunger body 10 integrally connected to the nozzle needle 1 being mounted radially floating in the throttle bore body 7. For radially floating mounting of the nozzle needle 1 and the plunger body 10, an annular gap 17 is formed in the throttle body 7 in the present case. The annular gap 17 is covered to the side of the second pressure chamber by an annular end face of the nozzle needle 1, so that no additional flow channel is provided, via which fuel can flow from the first pressure chamber into the second pressure chamber. To facilitate the centering of the nozzle needle 1 and the plunger body 10, an annular centering 12 is formed on the washer 1 1 and on the holding body 15, with which the washer 1 1 and the holding body 15 is inserted into the high-pressure bore 2 of the nozzle body 3 can be. In this respect, a guide or centering of the nozzle needle 1 is further ensured in a seat remote area on the washer 1 1 and the holding body 15.

Claims

Ansprüche claims
1 . Düsenbaugruppe für einen Kraftstoffinjektor mit einer Düsennadel (1 ), die in einer Hochdruckbohrung (2) eines Düsenkörpers (3) zum Freigeben und Verschließen wenigstens einer Einspritzöffnung (4) über wenigstens einen Führungsabschnitt (5, 6) hubbeweglich geführt und zumindest mittelbar von der Federkraft einer Schließfeder (8) beaufschlagt ist, sowie einem in axialer Richtung federkraftbeaufschlagten Drosseibohrungskörper (7), 1 . Nozzle assembly for a fuel injector with a nozzle needle (1) which in a high-pressure bore (2) of a nozzle body (3) for releasing and closing at least one injection opening (4) via at least one guide portion (5, 6) guided in a liftable and at least indirectly by the spring force a closing spring (8) is acted upon, and a spring-loaded in the axial direction Drosseibohrungskörper (7),
dadurch gekennzeichnet, dass der Drosseibohrungskörper (7) an der Düsennadel (1 ) anliegt und in axialer Richtung von der Federkraft der Schließfeder (8) beaufschlagt ist. characterized in that the Drosseibohrungskörper (7) against the nozzle needle (1) and in the axial direction of the spring force of the closing spring (8) is acted upon.
2. Düsenbaugruppe nach Anspruch 1 , 2. Nozzle assembly according to claim 1,
dadurch gekennzeichnet, dass der Drosseibohrungskörper (7) kolbenartig ausgebildet ist und einen Außendurchmesser D1 besitzt, der größer als der Außendurchmesser D2 der Düsennadei (1 ) im Kontaktbereich mit dem Drosseibohrungskörper (7) ist. characterized in that the Drosseibohrungskörper (7) is piston-like and has an outer diameter D 1 , which is greater than the outer diameter D 2 of Düsennadei (1) in the contact area with the Drosseibohrungskörper (7).
3. Düsenbaugruppe nach Anspruch 1 oder 2, 3. Nozzle assembly according to claim 1 or 2,
dadurch gekennzeichnet, dass der Drosseibohrungskörper (7) wenigstens eine Drosselbohrung (9) besitzt, die als Axialbohrung ausgeführt ist. characterized in that the Drosseibohrungskörper (7) has at least one throttle bore (9), which is designed as an axial bore.
4. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, 4. Nozzle assembly according to one of the preceding claims,
dadurch gekennzeichnet, dass der Drosseibohrungskörper (7) zur Führung der Düsennadel (1 ) mit einem Führungsabschnitt (6) des Düsenkörpers (3) zusammenwirkt. characterized in that the Drosseibohrungskörper (7) for guiding the nozzle needle (1) with a guide portion (6) of the nozzle body (3) cooperates.
5. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, 5. Nozzle assembly according to one of the preceding claims,
dadurch gekennzeichnet, dass der Drosseibohrungskörper (7) mit der Düsennadei (1 ) einstückig verbunden ist. characterized in that the Drosseibohrungskörper (7) with the Düsennadei (1) is integrally connected.
6. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, 6. Nozzle assembly according to one of the preceding claims,
dadurch gekennzeichnet, dass der Drosselbohrungskörper (7) von der Düsennadel (1 ) durchsetzt ist, wobei der den Drosselbohrungskörper (7) durchsetzende Abschnitt der Düsennadel (1 ) einen Außendurchmesser D3 besitzt, der kleiner als der Außendurchmesser D2 der Düsennadel (1 ) ist. characterized in that the throttle bore body (7) is penetrated by the nozzle needle (1), wherein the throttle bore body (7) passing through section of the nozzle needle (1) has an outer diameter D 3 , which is smaller than the outer diameter D 2 of the nozzle needle (1). is.
7. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, 7. Nozzle assembly according to one of the preceding claims,
dadurch gekennzeichnet, dass der den Drosselbohrungskörper (7) durchsetzende Abschnitt der Düsennadel (1 ) ein Stößelkörper (10) ist, der einstückig mit der Düsennadel (1 ) verbunden ist. characterized in that the throttle bore body (7) passing through the portion of the nozzle needle (1) is a plunger body (10) which is integrally connected to the nozzle needle (1).
8. Düsenbaugruppe nach Anspruch 6 oder 7, 8. nozzle assembly according to claim 6 or 7,
dadurch gekennzeichnet, dass der den Drosselbohrungskörper (7) durchsetzende Abschnitt der Düsennadel (1 ) bzw. der Stößelkörper (10) radial schwimmend im Drosselbohrungskörper (7) gelagert ist. characterized in that the throttle body (7) passing through the section of the nozzle needle (1) or the plunger body (10) radially floating in the throttle body (7) is mounted.
9. Düsenbaugruppe nach einem der Ansprüche 6 bis 8, 9. nozzle assembly according to any one of claims 6 to 8,
dadurch gekennzeichnet, dass der den Drosselbohrungskörper (7) durchsetzende Abschnitt der Düsennadel (1 ) bzw. der Stößelkörper (10) über eine axial an den Düsenkörper (3) angesetzte Zwischenscheibe (1 1 ) zentriert ist, die vorzugsweise einen im Düsenkörper (3) aufgenommenen ringförmigen Zentrierabschnitt (12) besitzt. characterized in that the portion of the nozzle needle (1) or the plunger body (10) passing through the throttle bore body (7) is centered via an intermediate disc (11) mounted axially on the nozzle body (3), preferably one in the nozzle body (3). has received annular centering portion (12).
10. Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer Düsenbaugruppe nach einem der vorhergehenden Ansprüche sowie einer Aktorbaugruppe zur Betätigung der Düsennadel (1 ), wobei die Düsennadel (1 ) über die Aktorbaugruppe vorzugsweise direkt betätigbar ist. 10. Fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle assembly according to any one of the preceding claims and an actuator assembly for actuating the nozzle needle (1), wherein the nozzle needle (1) via the Aktorbaugruppe is preferably directly operable.
EP12723468.0A 2011-05-30 2012-05-23 Nozzle assembly for a fuel injector, and fuel injector Active EP2715103B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110076665 DE102011076665A1 (en) 2011-05-30 2011-05-30 Nozzle assembly for a fuel injector and fuel injector
PCT/EP2012/059601 WO2012163759A1 (en) 2011-05-30 2012-05-23 Nozzle assembly for a fuel injector, and fuel injector

Publications (2)

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EP2715103A1 true EP2715103A1 (en) 2014-04-09
EP2715103B1 EP2715103B1 (en) 2016-08-10

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CN (1) CN103582751A (en)
DE (1) DE102011076665A1 (en)
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WO2012163759A1 (en) 2012-12-06
EP2715103B1 (en) 2016-08-10
CN103582751A (en) 2014-02-12
DE102011076665A1 (en) 2012-12-06

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