EP2235355B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP2235355B1
EP2235355B1 EP08871441A EP08871441A EP2235355B1 EP 2235355 B1 EP2235355 B1 EP 2235355B1 EP 08871441 A EP08871441 A EP 08871441A EP 08871441 A EP08871441 A EP 08871441A EP 2235355 B1 EP2235355 B1 EP 2235355B1
Authority
EP
European Patent Office
Prior art keywords
injector
control valve
component
injector according
valve element
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.)
Not-in-force
Application number
EP08871441A
Other languages
German (de)
French (fr)
Other versions
EP2235355A1 (en
Inventor
Nadja Eisenmenger
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
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Filing date
Publication date
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Publication of EP2235355A1 publication Critical patent/EP2235355A1/en
Application granted granted Critical
Publication of EP2235355B1 publication Critical patent/EP2235355B1/en
Not-in-force legal-status Critical Current
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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector, according to the preamble of claim 1.
  • the EP 1 612 403 A1 is a common rail injector with a pressure balanced in the axial direction control valve known.
  • the control valve which has a sleeve-shaped control valve element, the fuel pressure can be influenced within a control chamber bounded on the end side by an injection valve element.
  • the injection valve element is adjusted between an open position and a closed position, wherein the injection valve element releases the fuel flow into the combustion chamber of an internal combustion engine in its open position.
  • the sleeve-shaped control valve is guided with its inner circumference on an axial extension of an injector component which passes centrally through the control valve element and on which the control valve seat is also arranged.
  • an injector in which the sleeve-shaped control valve element of a pressure-balanced in the axial direction of the control valve is guided by means of a guide member on its outer periphery.
  • the guide component is designed as a separate component from the control valve seat having injector component.
  • control valve seat is to be designed as a conical seat, then this is problematic, since the guide component during assembly must be centered consuming relative to the Injektor component to produce a coaxiality between the conical seat and outer guide for the control valve element.
  • the invention has for its object to provide an injector with a guided on the outer circumference control valve element, in which automatically adjusts a good coaxiality between the outer guide and the control valve seat during assembly.
  • the invention is based on the idea of arranging the guide component directly adjacent to the injector component, the contact surfaces between the guide component and the injector component being designed as centering surfaces which are such that the guide component automatically aligns coaxially with the injector component during assembly.
  • an embodiment of the injector with a conical seat formed as a control valve seat can be realized in a simple manner, the invention is not limited to such an embodiment.
  • a trained according to the concept of the invention injector can be realized, for example, with a flat seat.
  • the injector according to the invention ensures good accessibility of the control valve seat during production and on an optional coating process and, on the other hand, optimum coaxiality between the outer guide (guide component) and the control valve seat is ensured.
  • an injector designed according to the concept of the invention combines the advantages of an injector in which a separate guide component is provided in addition to the injector component and an injector in which the control valve element is guided on an axial extension of the injector component.
  • the second centering surface of the injector component and the control valve seat cooperating with the first centering surface of the guide component are manufactured in one clamping.
  • an embodiment is advantageous in which the two centering surfaces form a combination of inner cone and outer cone, so either the first centering as réellekonus transformation and the second centering as an outer cone surface or the first centering surface is formed as an outer cone surface and the second centering surface as an inner cone surface.
  • the inner cone angle and the outer cone angle are selected from an angle range between about 80 ° and about 160 °, wherein other cone angles can be realized.
  • control valve seat is designed as a conical seat.
  • the guide member is suitable with appropriate shape for guiding all possible types of control valve elements.
  • the control valve element is designed such that the control valve is pressure-balanced in the axial direction.
  • the control valve is designed as a valve sleeve, act on the closed control valve exclusively in the radial direction oriented forces. Forces acting in the axial direction are preferably intercepted by a bolt projecting into the control valve element and by the injector component.
  • the bolt is designed as a separate component from the Injektorbauteil for facilitated production of the control valve seat, preferably in the axial direction up to an electromagnet assembly of a electromagnetic actuator and / or supported on an injector closure lid.
  • an embodiment is preferred in which the guide component is pressed against the end, ie with its centering surface, against the injector component, ie against the centering surface of the injector component.
  • the guide member is pressurized by means of an external thread part, in particular with the end face of a male threaded nut, which preferably cooperates with an internal thread on an injector body, in the axial direction of the injector component.
  • an embodiment is preferred in which the outer cone angle and the inner cone angle of the centering, preferably slightly, are different, so that during assembly, the centering first in a radial outside area or in a radially inner area come to rest.
  • the guide member is suppressed, preferably such that the two centering surfaces, at least approximately, abut each other over the entire surface.
  • the guide member and / or the Injektorbauteil must be elastic within limits, to join in the desired deformation during assembly without cracking.
  • the centering even more defined design, at least one of the two centering surfaces, preferably both centering, each be divided into at least two surface areas, for example by providing at least one lying between the surface areas annular groove.
  • a flow of fuel from the control chamber to an injector return is provided in a further development of the invention advantageously that at least one, at least approximately, extending in the radial direction bore is provided as a fuel channel in the guide member. Additionally or alternatively, on the outer circumference of the control valve element and / or on the inner circumference of a Guide bore in the guide member at least one mecanicnanschliff be provided so that at least one axial passage for the outflow of fuel from the control chamber is formed.
  • Fig. 1 a designed as a common rail injector injector 1 for injecting fuel into a combustion chamber of an internal combustion engine is shown.
  • the injector 1 is supplied via a high-pressure supply line 2 from a high-pressure fuel storage 3 (rail) with high pressure, in this embodiment about 2000 bar, standing fuel, especially diesel or gasoline.
  • the fuel high-pressure accumulator 3 is of one, in particular designed as a radial piston pump, high-pressure pump 4 supplied with fuel from a low-pressure reservoir 5.
  • a low pressure region 6 of the injector 1 is hydraulically connected via an injector return 7 to the reservoir 5. In the injector return 7, a later to be explained control amount of fuel is discharged and fed via the high-pressure pump 4 to the high-pressure circuit again.
  • the injector 1 has an injector body 8, in which a one-part or multi-part injection valve element 9 in the axial direction between an open position and a closed position is adjustable. In its open position, the injection valve element 9 releases the fuel flow from a nozzle hole arrangement (not shown) into the combustion chamber of the internal combustion engine (not shown).
  • the injection valve element 9 delimits a control chamber 11, which is arranged in a blind bore 12 of an injector component 13.
  • the control chamber 11 may for example be delimited by a sleeve component, which is spring-loaded in the axial direction by a spring, not shown, on the injector component 13.
  • the pressure chamber 15 is in turn via the high-pressure supply line 2 and a supply channel 16 in the injector 8 with fuel from the high-pressure fuel storage 3 supplied. Via a branched off from the supply channel 16 bore 17 fuel flows directly to a nozzle chamber, not shown, from which then 9 fuel can flow into the combustion chamber when the injection valve element is open.
  • the control chamber 11 is connected to a flow channel 18 extending in the axial direction within the Injektorbauteils 13 with outlet throttle 19 with a valve chamber 20 of a control valve 21 (servo-valve).
  • the valve chamber 20 is bounded in an upper portion radially outwardly by a control valve element 22 designed as a valve sleeve and in the axial direction in the plane of the drawing upwards by a multipart bolt 23 (pressure pin).
  • the bolt 23 is pressurized during operation in the axial direction of the drawing plane upwards, whereby the bolt 23 is supported via a contact plate 24 to an injector 25, which is fixed via a clamping nut 26 on the injector body 8.
  • the control valve 21 is a pressure-balanced valve in the axial direction, since the control valve element 22 formed integrally with an armature plate 27 does not have any hydraulic opening forces when the control valve 21 is closed.
  • the flow cross sections of the outlet throttle 19 and the inlet throttle 14 are matched to one another such that a net outflow of fuel from the control chamber 11 results, with the result that the force acting on the end face 10 of the injection valve element 9 pressure force drops and the injection valve element 9 of its not shown Injector element seat lifts.
  • the amount of fuel flowing to the injector return 7 is the control quantity of fuel mentioned in the introduction, which is then returned to the high-pressure circuit via the high-pressure pump 4.
  • the energization of the electromagnet 29 is interrupted, so that the control valve element 22 is moved by a arranged in the channel 34 compression spring 35 back on its trained on the injector component 13 control valve seat 28.
  • the sleeve-shaped control valve element 22 is guided on its outer circumference.
  • the guide member 33 has a sleeve portion 36 whose inner diameter corresponds to the outer diameter of the control valve element 22 plus a minimum guide clearance.
  • the sleeve portion 36 merges into an abutment portion 37 in its end region, wherein the transverse bores 32 are arranged in the transition region between the sleeve portion 36 and the abutment portion 37.
  • the abutment portion 37 has an inner cone-shaped first centering surface 38 on the side facing the injector component 13, in the plane of the drawing, with which the abutment portion 37 or the guide component 33 rests on an outer cone-shaped second centering surface 39 which abuts the guide component 33 facing, in the drawing plane upper end face of the Injektorbauteils 13 is arranged.
  • the cone angle (inner cone angle and outer cone angle) of the two centering surfaces 38, 39 are identical in the assembled state, but slightly different before assembly, so that in the clamped state of the guide member 33 a full surface contact of the centering surfaces 38, 39 is guaranteed to each other.
  • a male screw 40 is provided, which is with its external thread 41 in engagement with an internal thread 42 of the injector body 8 in a region axially between the anchor plate 27 and the Injektorbauteil 13.
  • annular space 43 is arranged, via the fuel with open control valve 21 from the valve chamber 20 in an overlying armature space 44 and from there into the channel 34 and the Injektor Weglauf 7 can flow.
  • FIG. 1 How to continue Fig. 1 is also between an axial extension 45 of the Injektorbauteils 13, at the free end of the control valve seat 28 is formed and the radially outwardly bounded in a lower portion of the valve space 20 and the inner periphery of the guide member 33, more precisely the abutment portion 37, a further annular space 46 is arranged , which is hydraulically connected via the transverse bores 32 with the annular space 43.
  • Fig. 2 In perspective, both the guide component 33 and the injector component 13 are shown in a cutaway exploded view. Evident is the previously described axial extension 45 of the injector component 13, on the end face of the conical-seat-shaped control valve seat 28 is formed. On a side facing away from the axial extension 45, in the drawing plane lower side, the Injektorbauteil 13 has an annular shoulder 47, with which it is supported in the axial direction on the injector 8 (see. Fig. 1 ).
  • the second centering surface 39 Radially outside and at axial distance from the axial extension 45 is formed as an annular surface, outer conical second centering surface 39 of the Injektorbauteils 13, which cooperates in the assembled state with the first centering surface 38 of the guide member 33.
  • the second centering surface 39 is formed of two partial surfaces 48, 49, which has an intermediate therebetween Ring groove 50 are spaced from each other. It is also conceivable to form the first centering surface 38 as a continuous surface or consisting of more than two partial surfaces.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Injektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine, insbesondere einen Common-Rail-Injektor, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector, according to the preamble of claim 1.

Aus der EP 1 612 403 A1 ist ein Common-Rail-Injektor mit einem in axialer Richtung druckausgeglichenen Steuerventil bekannt. Mittels des Steuerventils, welches ein hülsenförmiges Steuerventilelement aufweist, kann der Kraftstoffdruck innerhalb einer von einem Einspritzventilelement stirnseitig begrenzten Steuerkammer beeinflusst werden. Durch die Variation des Kraftstoffdruckes innerhalb der Steuerkammer wird das Einspritzventilelement zwischen einer Öffnungsstellung und einer Schließstellung verstellt, wobei das Einspritzventilelement in seiner Öffnungsstellung den Kraftstofffluss in den Brennraum einer Brennkraftmaschine freigibt. Bei dem bekannten Injektor ist das hülsenförmige Steuerventil mit seinem Innenumfang an einem das Steuerventilelement zentrisch durchsetzenden Axialfortsatz eines Injektorbauteils geführt, an dem auch der Steuerventilsitz angeordnet ist.From the EP 1 612 403 A1 is a common rail injector with a pressure balanced in the axial direction control valve known. By means of the control valve, which has a sleeve-shaped control valve element, the fuel pressure can be influenced within a control chamber bounded on the end side by an injection valve element. By varying the fuel pressure within the control chamber, the injection valve element is adjusted between an open position and a closed position, wherein the injection valve element releases the fuel flow into the combustion chamber of an internal combustion engine in its open position. In the known injector, the sleeve-shaped control valve is guided with its inner circumference on an axial extension of an injector component which passes centrally through the control valve element and on which the control valve seat is also arranged.

Es ist weiterhin aus der DE 10 2006 056 840 A1 ein Injektor bekannt, bei dem das hülsenförmige Steuerventilelement eines in axialer Richtung druckausgeglichenen Steuerventils mittels eines Führungsbauteils an seinem Außenumfang geführt ist. Dabei ist das Führungsbauteil als von dem den Steuerventilsitz aufweisenden Injektorbauteil separates Bauteil ausgebildet. Vorteilhaft bei dieser Ausführungsform ist es, dass der Steuerventilsitz unabhängig von der Führung für das Steuerventilelement bearbeitet werden kann. Wird das beschriebene Steuerventil mit einem als Flachsitz ausgebildeten Steuerventilsitz ausgeführt, spielt die radiale Positionierung des Führungsbauteils relativ zu dem Injektorbauteil eine untergeordnete Rolle. Soll jedoch der Steuerventilsitz als Kegelsitz ausgeführt werden, so ist dies problematisch, da das Führungsbauteil bei der Montage aufwändig relativ zu dem Injektorbauteil zentriert werden muss, um eine Koaxialität zwischen Kegelsitz und Außenführung für das Steuerventilelement herzustellen.It is still out of the DE 10 2006 056 840 A1 an injector is known in which the sleeve-shaped control valve element of a pressure-balanced in the axial direction of the control valve is guided by means of a guide member on its outer periphery. In this case, the guide component is designed as a separate component from the control valve seat having injector component. An advantage of this embodiment is that the control valve seat can be processed independently of the guide for the control valve element. If the described control valve is designed with a control valve seat embodied as a flat seat, the radial positioning of the guide component relative to the injector component plays a subordinate role. However, if the control valve seat is to be designed as a conical seat, then this is problematic, since the guide component during assembly must be centered consuming relative to the Injektor component to produce a coaxiality between the conical seat and outer guide for the control valve element.

Offenbarung der ErfindungDisclosure of the invention Technische AufgabeTechnical task

Der Erfindung liegt die Aufgabe zugrunde, einen Injektor mit einem am Außenumfang geführten Steuerventilelement vorzuschlagen, bei dem sich automatisch bei der Montage eine gute Koaxialität zwischen der Außenführung und dem Steuerventilsitz einstellt.The invention has for its object to provide an injector with a guided on the outer circumference control valve element, in which automatically adjusts a good coaxiality between the outer guide and the control valve seat during assembly.

Technische LösungTechnical solution

Diese Aufgabe wird mit einem Injektor mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. In den Rahmen der Erfindung fallen sämtliche Kombinationen aus zumindest zwei von in der Beschreibung, den Ansprüchen und/oder den Figuren angegebenen Merkmalen.This object is achieved with an injector having the features of claim 1. Advantageous developments of the invention are specified in the subclaims. All combinations of at least two features specified in the description, the claims and / or the figures fall within the scope of the invention.

Der Erfindung liegt der Gedanke zugrunde, das Führungsbauteil unmittelbar am Injektorbauteil anliegend anzuordnen, wobei die Kontaktflächen zwischen dem Führungsbauteil und dem Injektorbauteil als Zentrierflächen ausgebildet sind, die derart beschaffen sind, dass sich das Führungsbauteil bei der Montage automatisch koaxial zum Injektorbauteil ausrichtet. Hierdurch kann auf einfache Weise eine Ausführungsform des Injektors mit als Kegelsitz ausgebildetem Steuerventilsitz realisiert werden, wobei die Erfindung nicht auf eine solche Ausführungsform beschränkt ist. Ein nach dem Konzept der Erfindung ausgebildeter Injektor lässt sich beispielsweise auch mit einem Flachsitz realisieren. Der erfindungsgemäße Injektor gewährleistet zum einen eine gute Zugänglichkeit des Steuerventilsitzes bei der Fertigung und bei einem fakultativen Beschichtungsvorgang und zum anderen wird eine optimale Koaxialität zwischen der Außenführung (Führungsbauteil) und dem Steuerventilsitz gewährleistet. Anders ausgedrückt vereint ein nach dem Konzept der Erfindung ausgebildeter Injektor die Vorteile eines Injektors, bei dem zusätzlich zu dem Injektorbauteil ein separates Führungsbauteil vorgesehen ist und eines Injektors, bei dem das Steuerventilelement an einem axialen Fortsatz des Injektorbauteils geführt ist. Um die Präzision bei der Fertigung weiter zu optimieren, ist es von Vorteil, wenn die mit der ersten Zentrierfläche des Führungsbauteils zusammenwirkende zweite Zentrierfläche des Injektorbauteils und der Steuerventilsitz in einer Aufspannung gefertigt werden. Zusätzlich ist es vorteilhaft, beim Führungsbauteil die Führung und die Zentrierfläche ebenfalls in einer Aufspannung zu fertigen. Hierdurch werden die jeweiligen Planschlagtoleranzen beider Bauteile minimiert.The invention is based on the idea of arranging the guide component directly adjacent to the injector component, the contact surfaces between the guide component and the injector component being designed as centering surfaces which are such that the guide component automatically aligns coaxially with the injector component during assembly. As a result, an embodiment of the injector with a conical seat formed as a control valve seat can be realized in a simple manner, the invention is not limited to such an embodiment. A trained according to the concept of the invention injector can be realized, for example, with a flat seat. The injector according to the invention, on the one hand, ensures good accessibility of the control valve seat during production and on an optional coating process and, on the other hand, optimum coaxiality between the outer guide (guide component) and the control valve seat is ensured. In other words, an injector designed according to the concept of the invention combines the advantages of an injector in which a separate guide component is provided in addition to the injector component and an injector in which the control valve element is guided on an axial extension of the injector component. In order to further optimize the precision in the production, it is advantageous if the second centering surface of the injector component and the control valve seat cooperating with the first centering surface of the guide component are manufactured in one clamping. In addition, it is advantageous to manufacture the guide and the centering surface also in one setting in the guide component. As a result, the respective flange impact tolerances of both components are minimized.

Um gleichzeitig sowohl eine hohe Präzision im Hinblick auf die Koaxialität sowie die Rechtwinkligkeit des Steuerventilsitzes zur Außenführung sicherzustellen, ist eine Ausführungsform von Vorteil, bei der die beiden Zentrierflächen eine Kombination aus Innenkonus und Außenkonus bilden, also entweder die erste Zentrierfläche als Innenkonusfläche und die zweite Zentrierfläche als Außenkonusfläche oder die erste Zentrierfläche als Außenkonusfläche und die zweite Zentrierfläche als Innenkonusfläche ausgebildet ist. Bevorzugt werden der Innenkonuswinkel und der Außenkonuswinkel dabei aus einem Winkelbereich zwischen etwa 80° und etwa 160° gewählt, wobei auch andere Konuswinkel realisierbar sind.In order to simultaneously ensure both a high precision with regard to the coaxiality and the squareness of the control valve seat to the outer guide, an embodiment is advantageous in which the two centering surfaces form a combination of inner cone and outer cone, so either the first centering as Innenkonusfläche and the second centering as an outer cone surface or the first centering surface is formed as an outer cone surface and the second centering surface as an inner cone surface. Preferably, the inner cone angle and the outer cone angle are selected from an angle range between about 80 ° and about 160 °, wherein other cone angles can be realized.

Von besonderem Vorteil ist eine Ausführungsform, bei der der Innenkonuswinkel und der Außenkonuswinkel derart gewählt werden, dass die Kombination aus den beiden Zentrierflächen nicht selbsthemmend ist, um ein automatisches Ausrichten des Führungsbauteils zu dem Injektorbauteil bei der Montage zu ermöglichen.Of particular advantage is an embodiment in which the inner cone angle and the outer cone angle are chosen such that the combination of the two centering surfaces is not self-locking to allow automatic alignment of the guide member to the injector during assembly.

In Weiterbildung der Erfindung ist mit Vorteil vorgesehen, dass der Steuerventilsitz als Kegelsitz ausgebildet ist. Das Vorsehen eines Kegelsitzes als Steuerventilsitz stellt bei dem beschriebenen Injektor, bei der das Führungsbauteil und das Injektorbauteil jeweils über eine Zentrierfläche aneinander anliegen, kein Problem im Hinblick auf die Koaxialität zwischen Steuerventilsitz und Außenführung dar.In a further development of the invention is advantageously provided that the control valve seat is designed as a conical seat. The provision of a conical seat as a control valve seat in the described injector, in which the guide member and the Injektorbauteil each rest on a centering surface, no problem with regard to the coaxiality between the control valve seat and outer guide.

Das Führungsbauteil eignet sich bei entsprechender Ausformung zur Führung aller möglichen Arten von Steuerventilelementen. Besonders bevorzugt ist jedoch eine Ausführungsform des Injektors, bei der das Steuerventilelement derart ausgebildet ist, dass das Steuerventil in axialer Richtung druckausgeglichen ist. Auf besonders elegante Weise kann dies dadurch realisiert werden, dass das Steuerventil als Ventilhülse ausgebildet ist, auf die bei geschlossenem Steuerventil ausschließlich in radialer Richtung orientierte Kräfte wirken. In axialer Richtung wirkende Kräfte werden bevorzugt von einem in das Steuerventilelement hineinragenden Bolzen sowie von dem Injektorbauteil abgefangen. Dabei ist es möglich, den Bolzen einteilig mit dem Injektorbauteil auszuführen, wobei jedoch eine Ausführungsform bevorzugt ist, bei der zur erleichterten Fertigung des Steuerventilsitzes der Bolzen als von dem Injektorbauteil separates Bauteil ausgebildet ist, das sich vorzugsweise in axialer Richtung nach oben an einer Elektromagnetanordnung eines elektromagnetischen Aktuators und/oder an einem Injektorverschlussdeckel abstützt.The guide member is suitable with appropriate shape for guiding all possible types of control valve elements. However, especially preferred is one Embodiment of the injector, wherein the control valve element is designed such that the control valve is pressure-balanced in the axial direction. In a particularly elegant way this can be realized in that the control valve is designed as a valve sleeve, act on the closed control valve exclusively in the radial direction oriented forces. Forces acting in the axial direction are preferably intercepted by a bolt projecting into the control valve element and by the injector component. In this case, it is possible to carry out the bolt in one piece with the injector component, wherein, however, an embodiment is preferred in which the bolt is designed as a separate component from the Injektorbauteil for facilitated production of the control valve seat, preferably in the axial direction up to an electromagnet assembly of a electromagnetic actuator and / or supported on an injector closure lid.

Um eine ausreichende Positionsstabilität des Führungsbauteils relativ zu dem Injektorbauteil während des Betriebs des Injektors zu gewährleisten, ist eine Ausführungsform bevorzugt, bei der das Führungsbauteil stirnseitig, d. h. mit seiner Zentrierfläche, gegen das Injektorbauteil, d. h. gegen die Zentrierfläche des Injektorbauteils, gepresst ist. Dabei ist eine Ausführungsform besonders bevorzugt, bei der das Führungsbauteil mittels eines Außengewindeteils, insbesondere mit der Stirnseite einer Außengewindemutter, die vorzugsweise mit einem Innengewinde an einem Injektorkörper zusammenwirkt, in axialer Richtung auf das Injektorbauteil druckbeaufschlagt wird.In order to ensure sufficient positional stability of the guide component relative to the injector component during operation of the injector, an embodiment is preferred in which the guide component is pressed against the end, ie with its centering surface, against the injector component, ie against the centering surface of the injector component. In this case, an embodiment is particularly preferred in which the guide member is pressurized by means of an external thread part, in particular with the end face of a male threaded nut, which preferably cooperates with an internal thread on an injector body, in the axial direction of the injector component.

Um zu gewährleisten, dass die beiden Zentrierflächen, zumindest näherungsweise, vollständig aneinander zur Anlage kommen, ist eine Ausführungsform bevorzugt, bei der der Außenkonuswinkel und der Innenkonuswinkel der Zentrierflächen, vorzugsweise geringfügig, unterschiedlich sind, so dass bei der Montage die Zentrierflächen zuerst in einem radial äußeren Bereich oder in einem radial inneren Bereich zur Anlage kommen. Durch Einleiten einer Axialkraft, beispielsweise mit der zuvor beschriebenen Außengewindemutter, wird dann das Führungsbauteil überdrückt, vorzugsweise derart, dass die beiden Zentrierflächen, zumindest näherungsweise, vollflächig aneinander anliegen. Hierzu muss das Führungsbauteil und/oder das Injektorbauteil in Grenzen elastisch sein, um die gewünschte Verformung bei der Montage ohne Rissbildung mitzumachen. Um die Anlageflächen, d. h. die Zentrierflächen, noch definierter auszugestalten, kann zumindest eine der beiden Zentrierflächen, vorzugsweise können beide Zentrierflächen, jeweils in mindestens zwei Flächenbereiche aufgeteilt sein, beispielsweise durch das Vorsehen mindestens einer zwischen den Flächenbereichen liegenden Ringnut. Es ist jedoch auch denkbar, eine oder beide Zentrierflächen als jeweils zusammenhängende Fläche auszubilden.In order to ensure that the two centering surfaces, at least approximately, completely abut each other, an embodiment is preferred in which the outer cone angle and the inner cone angle of the centering, preferably slightly, are different, so that during assembly, the centering first in a radial outside area or in a radially inner area come to rest. By introducing an axial force, for example with the externally threaded nut described above, then the guide member is suppressed, preferably such that the two centering surfaces, at least approximately, abut each other over the entire surface. For this purpose, the guide member and / or the Injektorbauteil must be elastic within limits, to join in the desired deformation during assembly without cracking. To the contact surfaces, d. H. the centering, even more defined design, at least one of the two centering surfaces, preferably both centering, each be divided into at least two surface areas, for example by providing at least one lying between the surface areas annular groove. However, it is also conceivable to form one or both centering surfaces as a contiguous surface.

Um bei geöffnetem Steuerventilsitz ein Abströmen von Kraftstoff aus der Steuerkammer zu einem Injektorrücklauf zu ermöglichen, ist in Weiterbildung der Erfindung mit Vorteil vorgesehen, dass in dem Führungsbauteil mindestens eine sich, zumindest näherungsweise, in radialer Richtung erstreckende Bohrung als Kraftstoffkanal vorgesehen ist. Zusätzlich oder alternativ können am Außenumfang des Steuerventilelementes und/oder am Innenumfang einer Führungsbohrung im Führungsbauteil mindestens ein Flächenanschliff vorgesehen werden, so dass mindestens ein Axialkanal zum Abströmen von Kraftstoff aus der Steuerkammer gebildet wird.In order to allow for open control valve seat, a flow of fuel from the control chamber to an injector return, is provided in a further development of the invention advantageously that at least one, at least approximately, extending in the radial direction bore is provided as a fuel channel in the guide member. Additionally or alternatively, on the outer circumference of the control valve element and / or on the inner circumference of a Guide bore in the guide member at least one Flächenanschliff be provided so that at least one axial passage for the outflow of fuel from the control chamber is formed.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnungen. Diese zeigen in:

Fig. 1:
einen Ausschnitt eines als Common-Rail-Injektor ausgebildeten Injektors mit Steuerventil und
Fig. 2:
eine perspektivische, geschnittene Darstellung eines Führungsbauteils und eines Injektorbauteils.
Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. These show in:
Fig. 1:
a section of a common rail injector designed as an injector with control valve and
Fig. 2:
a perspective, sectional view of a guide member and an injector component.

Ausführungsformen der ErfindungEmbodiments of the invention

In den Figuren sind gleiche Bauteile und Bauteile mit der gleichen Funktion mit den gleichen Bezugszeichen gekennzeichnet.In the figures, the same components and components with the same function with the same reference numerals.

In Fig. 1 ist ein als Common-Rail-Injektor ausgebildeter Injektor 1 zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine dargestellt. Der Injektor 1 wird über eine Hochdruckversorgungsleitung 2 von einem Kraftstoff-Hochdruckspeicher 3 (Rail) mit unter hohem Druck, von in diesem Ausführungsbeispiel etwa 2000 bar, stehenden Kraftstoff, insbesondere Diesel oder Benzin, versorgt. Der Kraftstoff-Hochdruckspeicher 3 wird von einer, insbesondere als Radialkolbenpumpe ausgebildeten, Hochdruckpumpe 4 mit Kraftstoff aus einem auf Niederdruck liegenden Vorratsbehälter 5 versorgt. Ein Niederdruckbereich 6 des Injektors 1 ist über einen Injektorrücklauf 7 mit dem Vorratsbehälter 5 hydraulisch verbunden. In den Injektorrücklauf 7 wird eine später noch zu erläuternde Steuermenge an Kraftstoff abgeführt und über die Hochdruckpumpe 4 dem Hochdruckkreislauf wieder zugeführt.In Fig. 1 a designed as a common rail injector injector 1 for injecting fuel into a combustion chamber of an internal combustion engine is shown. The injector 1 is supplied via a high-pressure supply line 2 from a high-pressure fuel storage 3 (rail) with high pressure, in this embodiment about 2000 bar, standing fuel, especially diesel or gasoline. The fuel high-pressure accumulator 3 is of one, in particular designed as a radial piston pump, high-pressure pump 4 supplied with fuel from a low-pressure reservoir 5. A low pressure region 6 of the injector 1 is hydraulically connected via an injector return 7 to the reservoir 5. In the injector return 7, a later to be explained control amount of fuel is discharged and fed via the high-pressure pump 4 to the high-pressure circuit again.

Der Injektor 1 weist einen Injektorkörper 8 auf, in dem ein einteiliges oder mehrteiliges Einspritzventilelement 9 in axialer Richtung zwischen einer Öffnungsstellung und einer Schließstellung verstellbar ist. In seiner Öffnungsstellung gibt das Einspritzventilelement 9 den Kraftstofffluss aus einer nicht gezeigten Düsenlochanordnung in den Brennraum der Brennkraftmaschine frei (nicht dargestellt).The injector 1 has an injector body 8, in which a one-part or multi-part injection valve element 9 in the axial direction between an open position and a closed position is adjustable. In its open position, the injection valve element 9 releases the fuel flow from a nozzle hole arrangement (not shown) into the combustion chamber of the internal combustion engine (not shown).

Mit einer oberen Stirnseite 10 begrenzt das Einspritzventilelement 9 eine Steuerkammer 11, die in einer Sacklochbohrung 12 eines Injektorbauteils 13 angeordnet ist. Alternativ kann die Steuerkammer 11 beispielsweise von einem Hülsenbauteil begrenzt sein, das in axialer Richtung von einer nicht gezeigten Feder auf das Injektorbauteil 13 federkraftbeaufschlagt ist.With an upper end face 10, the injection valve element 9 delimits a control chamber 11, which is arranged in a blind bore 12 of an injector component 13. Alternatively, the control chamber 11 may for example be delimited by a sleeve component, which is spring-loaded in the axial direction by a spring, not shown, on the injector component 13.

In die Steuerkammer 11 mündet eine in das Injektorbauteil 13 eingebrachte radiale Zulaufdrossel 14, die die Steuerkammer 11 mit Kraftstoff aus einem den unteren, die Steuerkammer 11 aufnehmenden, Abschnitt des Injektorbauteils 13 umgebenden Druckraum 15 (Ringraum) versorgt. Der Druckraum 15 wird wiederum über die Hochdruckversorgungsleitung 2 und einen Versorgungskanal 16 im Injektorkörper 8 mit Kraftstoff aus dem Kraftstoff-Hochdruckspeicher 3 versorgt. Über eine vom Versorgungskanal 16 abgezweigte Bohrung 17 strömt Kraftstoff unmittelbar zu einem nicht gezeigten Düsenraum, aus dem dann bei geöffnetem Einspritzventilelement 9 Kraftstoff in den Brennraum strömen kann.In the control chamber 11, a introduced into the Injektorbauteil 13 radial inlet throttle 14, which supplies the control chamber 11 with fuel from a lower, the control chamber 11 receiving, portion of the Injektorbauteils 13 surrounding pressure chamber 15 (annulus). The pressure chamber 15 is in turn via the high-pressure supply line 2 and a supply channel 16 in the injector 8 with fuel from the high-pressure fuel storage 3 supplied. Via a branched off from the supply channel 16 bore 17 fuel flows directly to a nozzle chamber, not shown, from which then 9 fuel can flow into the combustion chamber when the injection valve element is open.

Die Steuerkammer 11 ist mit einem in axialer Richtung innerhalb des Injektorbauteils 13 verlaufenden Ablaufkanal 18 mit Ablaufdrossel 19 mit einem Ventilraum 20 eines Steuerventils 21 (Servo-Ventil) verbunden. Der Ventilraum 20 wird in einem oberen Abschnitt radial außen von einem als Ventilhülse ausgebildeten Steuerventilelement 22 begrenzt und in axialer Richtung in der Zeichnungsebene nach oben von einem mehrteiligen Bolzen 23 (Druckstift). Der Bolzen 23 ist während des Betriebs in axialer Richtung der Zeichnungsebene nach oben druckbeaufschlagt, wodurch sich der Bolzen 23 über einen Anlageteller 24 an einem Injektordeckel 25 abstützt, der über eine Spannmutter 26 am Injektorkörper 8 festgelegt ist. Bei dem Steuerventil 21 handelt es sich um ein in axialer Richtung druckausgeglichenes Ventil, da auf das einstückig mit einer Ankerplatte 27 ausgebildete Steuerventilelement 22 bei geschlossenem Steuerventil 21 keine hydraulischen Öffnungskräfte wirken.The control chamber 11 is connected to a flow channel 18 extending in the axial direction within the Injektorbauteils 13 with outlet throttle 19 with a valve chamber 20 of a control valve 21 (servo-valve). The valve chamber 20 is bounded in an upper portion radially outwardly by a control valve element 22 designed as a valve sleeve and in the axial direction in the plane of the drawing upwards by a multipart bolt 23 (pressure pin). The bolt 23 is pressurized during operation in the axial direction of the drawing plane upwards, whereby the bolt 23 is supported via a contact plate 24 to an injector 25, which is fixed via a clamping nut 26 on the injector body 8. The control valve 21 is a pressure-balanced valve in the axial direction, since the control valve element 22 formed integrally with an armature plate 27 does not have any hydraulic opening forces when the control valve 21 is closed.

Zum Öffnen des Steuerventils 21, also zum Abheben des Steuerventilelementes 22 von seinem am Injektorbauteil 13 ausgebildeten, als Kegelsitz ausgebildeten, Steuerventilsitz 28 wird ein Elektromagnet 29 in einem Haltekörper 30 eines elektromagnetischen Aktuators 31 bestromt, so dass die in der Zeichnungsebene unterhalb des Elektromagneten 29 angeordnete Ankerplatte 27 und somit das Steuerventilelement 22 in der Zeichnungsebene in axialer Richtung nach oben bewegt werden. Hierdurch kann Kraftstoff aus dem Ventilraum 20 radial unterhalb dem Steuerventilelement 22 hindurch über Querbohrungen 32 in einem Führungsbauteil 33 in Richtung des Injektorrücklaufs 7 strömen. Auf seinem Weg zum Injektorrücklauf 7 muss der Kraftstoff dabei durch einen zentrischen Kanal 34 im Haltekörper 30 strömen, der von dem Bolzen 23 durchsetzt ist. Dabei sind die Durchflussquerschnitte der Ablaufdrossel 19 und der Zulaufdrossel 14 derart aufeinander abgestimmt, dass ein Nettoabfluss von Kraftstoff aus der Steuerkammer 11 resultiert, mit der Folge, dass die auf die Stirnseite 10 des Einspritzventilelementes 9 wirkende Druckkraft sinkt und das Einspritzventilelement 9 von seinem nicht gezeigten Einspritzventilelementsitz abhebt. Bei der zum Injektorrücklauf 7 strömenden Kraftstoffmenge handelt es sich um die eingangs erwähnte Steuermenge an Kraftstoff, die dann über die Hochdruckpumpe 4 dem Hochdruckkreislauf wieder zugeführt wird. Zum Beenden des Einspritzvorgangs wird die Bestromung des Elektromagneten 29 unterbrochen, so dass das Steuerventilelement 22 von einer in dem Kanal 34 angeordneten Druckfeder 35 wieder auf seinen am Injektorbauteil 13 ausgebildeten Steuerventilsitz 28 bewegt wird. Durch den durch die Zulaufdrossel 14 weiterhin in die Steuerkammer 11 strömenden Kraftstoff steigt der Druck in der Steuerkammer 11 rapide an, wodurch das Einspritzventilelement 9 in der Zeichnungsebene nach unten auf seinen nicht gezeigten Einspritzventilelementsitz bewegt wird, wodurch der Kraftstofffluss in den Brennraum der Brennkraftmaschine unterbrochen wird.To open the control valve 21, so for lifting the control valve element 22 formed by its injector 13, formed as a conical seat, control valve seat 28, an electromagnet 29 is energized in a holding body 30 of an electromagnetic actuator 31, so that arranged in the drawing plane below the electromagnet 29 Anchor plate 27 and thus the control valve element 22 in the plane of the drawing in axial Direction to be moved upwards. As a result, fuel can flow out of the valve chamber 20 radially below the control valve element 22 via transverse bores 32 in a guide component 33 in the direction of the injector return 7. On its way to injector return 7, the fuel must flow through a central channel 34 in the holding body 30, which is penetrated by the bolt 23. The flow cross sections of the outlet throttle 19 and the inlet throttle 14 are matched to one another such that a net outflow of fuel from the control chamber 11 results, with the result that the force acting on the end face 10 of the injection valve element 9 pressure force drops and the injection valve element 9 of its not shown Injector element seat lifts. The amount of fuel flowing to the injector return 7 is the control quantity of fuel mentioned in the introduction, which is then returned to the high-pressure circuit via the high-pressure pump 4. To end the injection process, the energization of the electromagnet 29 is interrupted, so that the control valve element 22 is moved by a arranged in the channel 34 compression spring 35 back on its trained on the injector component 13 control valve seat 28. By the fuel flowing through the inlet throttle 14 continues in the control chamber 11 fuel, the pressure in the control chamber 11 increases rapidly, whereby the injection valve element 9 is moved in the drawing plane down to its injector seat, not shown, whereby the flow of fuel is interrupted in the combustion chamber of the internal combustion engine ,

Wie aus Fig. 1 ersichtlich ist, ist das hülsenförmige Steuerventilelement 22 an seinem Außenumfang geführt. Hierzu weist das Führungsbauteil 33 einen Hülsenabschnitt 36 auf, dessen Innendurchmesser dem Außendurchmesser des Steuerventilelementes 22 zuzüglich eines minimalen Führungsspiels entspricht. Der Hülsenabschnitt 36 geht in seinem Endbereich in einen Anlageabschnitt 37 über, wobei die Querbohrungen 32 im Übergangsbereich zwischen dem Hülsenabschnitt 36 und dem Anlageabschnitt 37 angeordnet sind. Der Anlageabschnitt 37 weist stirnseitig auf der dem Injektorbauteil 13 zugewandten, in der Zeichnungsebene unteren, Seite eine innenkonusförmige erste Zentrierfläche 38 auf, mit der der Anlageabschnitt 37 bzw. das Führungsbauteil 33 vollflächig auf einer außenkonusförmigen zweiten Zentrierfläche 39 anliegt, die an der dem Führungsbauteil 33 zugewandten, in der Zeichnungsebene oberen, Stirnseite des Injektorbauteils 13 angeordnet ist. Die Konuswinkel (Innenkonuswinkel und Außenkonuswinkel) der beiden Zentrierflächen 38, 39 sind im montierten Zustand identisch, vor der Montage jedoch geringfügig unterschiedlich, so dass im verspannten Zustand des Führungsbauteils 33 eine vollflächige Anlage der Zentrierflächen 38, 39 aneinander gewährleistet ist.How out Fig. 1 it can be seen, the sleeve-shaped control valve element 22 is guided on its outer circumference. For this purpose, the guide member 33 has a sleeve portion 36 whose inner diameter corresponds to the outer diameter of the control valve element 22 plus a minimum guide clearance. The sleeve portion 36 merges into an abutment portion 37 in its end region, wherein the transverse bores 32 are arranged in the transition region between the sleeve portion 36 and the abutment portion 37. The abutment portion 37 has an inner cone-shaped first centering surface 38 on the side facing the injector component 13, in the plane of the drawing, with which the abutment portion 37 or the guide component 33 rests on an outer cone-shaped second centering surface 39 which abuts the guide component 33 facing, in the drawing plane upper end face of the Injektorbauteils 13 is arranged. The cone angle (inner cone angle and outer cone angle) of the two centering surfaces 38, 39 are identical in the assembled state, but slightly different before assembly, so that in the clamped state of the guide member 33 a full surface contact of the centering surfaces 38, 39 is guaranteed to each other.

Um eine vollflächige Anlage des Führungsbauteils 33 an dem Injektorbauteil 13 zu gewährleisten, ist eine Außengewindemutter 40 vorgesehen, die mit ihrem Außengewinde 41 in Eingriff mit einem Innengewinde 42 des Injektorkörpers 8 in einem Bereich axial zwischen der Ankerplatte 27 und dem Injektorbauteil 13 ist. Durch Verdrehen der Außengewindemutter 40 relativ zu dem Injektorkörper 8 wird das Führungsbauteil 33 mit seiner ersten Zentrierfläche 38 gegen die zweite Zentrierfläche 39 des Injektorbauteils 13 gepresst. Zu erkennen ist, dass zwischen dem Innenumfang der Außengewindemutter 40 und dem Hülsenabschnitt 36 des Führungsbauteils 33 ein Ringraum 43 angeordnet ist, über den Kraftstoff bei geöffnetem Steuerventil 21 aus dem Ventilraum 20 in einen darüber angeordneten Ankerraum 44 und von dort aus in den Kanal 34 sowie den Injektorrücklauf 7 strömen kann.In order to ensure a full-surface contact of the guide member 33 on the Injektorbauteil 13, a male screw 40 is provided, which is with its external thread 41 in engagement with an internal thread 42 of the injector body 8 in a region axially between the anchor plate 27 and the Injektorbauteil 13. By rotating the externally threaded nut 40 relative to the injector body 8, the guide member 33 is pressed with its first centering surface 38 against the second centering surface 39 of the Injektorbauteils 13. It can be seen that between the inner circumference of the externally threaded nut 40 and the Sleeve portion 36 of the guide member 33, an annular space 43 is arranged, via the fuel with open control valve 21 from the valve chamber 20 in an overlying armature space 44 and from there into the channel 34 and the Injektorrücklauf 7 can flow.

Wie sich weiterhin aus Fig. 1 ergibt, ist auch zwischen einem Axialfortsatz 45 des Injektorbauteils 13, an dessen freien Ende der Steuerventilsitz 28 ausgebildet ist und der radial außen in einem unteren Abschnitt den Ventilraum 20 begrenzt und dem Innenumfang des Führungsbauteils 33, genauer des Anlageabschnitts 37, ein weiterer Ringraum 46 angeordnet, der über die Querbohrungen 32 hydraulisch mit dem Ringraum 43 verbunden ist.How to continue Fig. 1 is also between an axial extension 45 of the Injektorbauteils 13, at the free end of the control valve seat 28 is formed and the radially outwardly bounded in a lower portion of the valve space 20 and the inner periphery of the guide member 33, more precisely the abutment portion 37, a further annular space 46 is arranged , which is hydraulically connected via the transverse bores 32 with the annular space 43.

In Fig. 2 sind in einer geschnittenen Explosionsdarstellung perspektivisch sowohl das Führungsbauteil 33 als auch das Injektorbauteil 13 gezeigt. Zu erkennen ist der zuvor beschriebene Axialfortsatz 45 des Injektorbauteils 13, an dessen Stirnseite der kegelsitzförmige Steuerventilsitz 28 ausgebildet ist. Auf einer vom Axialfortsatz 45 abgewandten, in der Zeichnungsebene unteren Seite weist das Injektorbauteil 13 eine Ringschulter 47 auf, mit der es sich in axialer Richtung am Injektorkörper 8 abstützt (vgl. Fig. 1).In Fig. 2 In perspective, both the guide component 33 and the injector component 13 are shown in a cutaway exploded view. Evident is the previously described axial extension 45 of the injector component 13, on the end face of the conical-seat-shaped control valve seat 28 is formed. On a side facing away from the axial extension 45, in the drawing plane lower side, the Injektorbauteil 13 has an annular shoulder 47, with which it is supported in the axial direction on the injector 8 (see. Fig. 1 ).

Radial außerhalb und mit Axialabstand zu dem Axialfortsatz 45 befindet sich die als Ringfläche ausgebildete, außenkonische zweite Zentrierfläche 39 des Injektorbauteils 13, die im montierten Zustand mit der ersten Zentrierfläche 38 des Führungsbauteils 33 zusammenwirkt. Wie aus Fig. 2 zu erkennen ist, ist die zweite Zentrierfläche 39 aus zwei Teilflächen 48, 49 gebildet, die über eine dazwischenliegende Ringnut 50 voneinander beabstandet sind. Es ist auch denkbar, die erste Zentrierfläche 38 als durchgehende Fläche oder bestehend aus mehr als zwei Teilflächen auszubilden.Radially outside and at axial distance from the axial extension 45 is formed as an annular surface, outer conical second centering surface 39 of the Injektorbauteils 13, which cooperates in the assembled state with the first centering surface 38 of the guide member 33. How out Fig. 2 can be seen, the second centering surface 39 is formed of two partial surfaces 48, 49, which has an intermediate therebetween Ring groove 50 are spaced from each other. It is also conceivable to form the first centering surface 38 as a continuous surface or consisting of more than two partial surfaces.

Ferner ist aus Fig. 2 zu erkennen, dass der Innendurchmesser D11 des Führungsbauteils 33 über die größte Längserstreckung des Hülsenabschnittes 36 größer ist als der Innendurchmesser D12 des Führungsbauteils 33 im untersten Abschnitt des Hülsenabschnittes 36 sowie im Anlageabschnitt 37, so dass die Führung des Steuerventilelementes 22 ausschließlich im Hülsenabschnitt 36 und nicht im radial breiteren Auflageabschnitt 37 erfolgt.Furthermore, it is off Fig. 2 to recognize that the inner diameter D 11 of the guide member 33 over the largest longitudinal extension of the sleeve portion 36 is greater than the inner diameter D 12 of the guide member 33 in the lowermost portion of the sleeve portion 36 and the abutment portion 37, so that the leadership of the control valve element 22 exclusively in the sleeve portion 36th and not in the radially wider support portion 37 takes place.

Claims (11)

  1. Injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector, having an injection valve element (9) which can be adjusted, as a function of the fuel pressure in a control chamber (11), between a closed position and an open position in which it permits the flow of fuel into the combustion chamber, and having a control valve (21) assigned to the control chamber (11), which control valve has a control valve element (22) which, by means of an actuator (31), can be adjusted relative to a control valve seat (28) arranged on an injector component (13) and which is guided at its outer circumference by a guide component (33),
    characterized
    in that the guide component (33) bears with a first centring surface (38) against a second centring surface (39) of the injector component (13).
  2. Injector according to Claim 1,
    characterized
    in that the first centring surface (38) is an internal cone surface and the second centring surface (39) is an external cone surface, or in that the first centring surface (38) is an external cone surface and the second centring surface (39) is an internal cone surface.
  3. Injector according to one of the preceding claims,
    characterized
    in that the combination of first centring surface (38) and second centring surface (39) does not exhibit self-locking.
  4. Injector according to one of the preceding claims,
    characterized
    in that the control valve seat (28) is in the form of a conical seat.
  5. Injector according to one of the preceding claims,
    characterized
    in that the control valve (21) is formed as a valve which is pressure-balanced in the axial direction.
  6. Injector according to one of the preceding claims,
    characterized
    in that the control valve element (22) is formed as a valve sleeve.
  7. Injector according to one of the preceding claims,
    characterized
    in that the guide component (33) is pressed at the end side against the injector component (13), preferably by means of an externally threaded nut (40).
  8. Injector according to one of Claims 2 to 7,
    characterized
    in that the external cone angle and the internal cone angle differ from one another, preferably to a small degree, before assembly.
  9. Injector according to one of the preceding claims,
    characterized
    in that the guide component (33) and/or the injector component (13) are elastic, such that the first and the second centring surface (38, 39) bear against one another at least approximately over their full area.
  10. Injector according to one of the preceding claims, characterized
    in that the first centring surface (38) and/or the second centring surface (39) are/is formed from at least two component surfaces (48, 49) which are preferably separated from one another by at least one annular groove (50).
  11. Injector according to one of the preceding claims,
    characterized
    in that at least one transverse bore (32) is provided in the guide component (33) and/or at least one axial duct is provided radially between the guide component (33) and the control valve element (22), through which at least one transverse bore/at least one axial duct fuel can flow in the direction of an injector return line (7) when the control valve element (22) is open.
EP08871441A 2008-01-23 2008-12-30 Fuel injector Not-in-force EP2235355B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810005523 DE102008005523A1 (en) 2008-01-23 2008-01-23 fuel injector
PCT/EP2008/068342 WO2009092508A1 (en) 2008-01-23 2008-12-30 Fuel injector

Publications (2)

Publication Number Publication Date
EP2235355A1 EP2235355A1 (en) 2010-10-06
EP2235355B1 true EP2235355B1 (en) 2013-03-27

Family

ID=40394195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08871441A Not-in-force EP2235355B1 (en) 2008-01-23 2008-12-30 Fuel injector

Country Status (6)

Country Link
EP (1) EP2235355B1 (en)
JP (1) JP5193312B2 (en)
CN (1) CN101925734B (en)
DE (1) DE102008005523A1 (en)
RU (1) RU2485344C2 (en)
WO (1) WO2009092508A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029116A1 (en) * 2009-09-02 2011-03-03 Robert Bosch Gmbh Fuel injector
BR112015032960B1 (en) 2013-07-04 2021-01-05 F. Hoffmann-La Roche Ag immunoassay suppressed by interference to detect anti-drug antibodies in serum samples
CN104196664B (en) * 2014-08-22 2019-05-14 中国北方发动机研究所(天津) A kind of conical surface sealed high pressure common rail injector control volume
DE102014225293A1 (en) * 2014-12-09 2016-06-09 Robert Bosch Gmbh fuel injector
DE102018202107A1 (en) * 2018-02-12 2019-08-14 Robert Bosch Gmbh Electromagnetically actuated control valve for a fuel injector and fuel injector
DE102018204492A1 (en) * 2018-03-23 2019-09-26 Robert Bosch Gmbh fuel injector
FR3084702B1 (en) * 2018-08-01 2021-01-15 Delphi Tech Ip Ltd HYDRAULIC VALVE ASSEMBLY METHOD

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
JPH0233875B2 (en) * 1983-07-15 1990-07-31 Nippon Jidosha Buhin Sogo Kenkyusho Kk DENWAISHIKIEKIATSUHATSUSEISOCHI
SU1178922A1 (en) * 1983-12-26 1985-09-15 Центральный научно-исследовательский дизельный институт Injector
AT394761B (en) * 1985-11-08 1992-06-25 Steyr Daimler Puch Ag FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
IT239878Y1 (en) * 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat IMPROVEMENTS TO AN ELECTROMAGNETIC CONTROL DOSING VALVE FOR A FUEL INJECTOR.
IT1293433B1 (en) * 1997-07-11 1999-03-01 Elasis Sistema Ricerca Fiat ADJUSTABLE DOSING VALVE FOR A FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINES, AND RELEVANT ADJUSTMENT METHOD.
DE10065015A1 (en) * 2000-12-23 2002-07-04 Bosch Gmbh Robert Solenoid valve for controlling an injection valve of an internal combustion engine
DE10346222A1 (en) * 2003-09-23 2005-04-14 Robert Bosch Gmbh Fuel injection device, especially for internal combustion engine with direct injection, has alignment arrangement that aligns sleeve part radially relative to housing recess and valve element is guided in sleeve part
JP2005344622A (en) * 2004-06-03 2005-12-15 Bosch Corp Fuel injection valve
ES2277229T3 (en) 2004-06-30 2007-07-01 C.R.F. Societa Consortile Per Azioni SERVOVALVULA TO CONTROL THE FUEL INJECTOR OF AN INTERNAL COMBUSTION ENGINE.
DE102005006818A1 (en) * 2005-02-15 2006-08-17 Volkswagen Mechatronic Gmbh & Co. Kg Sealing device for a fuel injector and method for sealing
DE102006021741A1 (en) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Fuel injector with pressure compensated control valve
CN101078388B (en) * 2006-05-25 2012-09-26 C.R.F.索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 Servo valve for fuel control and fuel injector provided with such servo valve
DE102006056840A1 (en) 2006-12-01 2008-06-05 Robert Bosch Gmbh fuel injector

Also Published As

Publication number Publication date
EP2235355A1 (en) 2010-10-06
RU2485344C2 (en) 2013-06-20
CN101925734A (en) 2010-12-22
CN101925734B (en) 2012-12-05
RU2010134914A (en) 2012-02-27
JP2011510222A (en) 2011-03-31
WO2009092508A1 (en) 2009-07-30
JP5193312B2 (en) 2013-05-08
DE102008005523A1 (en) 2009-07-30

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