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EP2531715B1 - Control valve assembly of a fuel injector - Google Patents

Control valve assembly of a fuel injector Download PDF

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Publication number
EP2531715B1
EP2531715B1 EP11700513.2A EP11700513A EP2531715B1 EP 2531715 B1 EP2531715 B1 EP 2531715B1 EP 11700513 A EP11700513 A EP 11700513A EP 2531715 B1 EP2531715 B1 EP 2531715B1
Authority
EP
European Patent Office
Prior art keywords
guide rod
fuel injector
face
control valve
projection
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.)
Active
Application number
EP11700513.2A
Other languages
German (de)
French (fr)
Other versions
EP2531715A1 (en
Inventor
Bjoern Scholemann
Helmut Clauss
Lorenz Zerle
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 EP2531715A1 publication Critical patent/EP2531715A1/en
Application granted granted Critical
Publication of EP2531715B1 publication Critical patent/EP2531715B1/en
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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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M61/04—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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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

Definitions

  • the invention relates to a control valve arrangement of a fuel injector according to the preamble of claim 1 or 2.
  • a fuel injector with such a control valve assembly is known from DE 10 2006 050 045 A1 known.
  • the fuel injector shown in this document has to control its injection nozzle, a nozzle needle which is connected to a plunger, which works in a displacement chamber Verdränger whatsoever.
  • the control chamber is connected via an input-side throttle line with a high-pressure fuel source usually a so-called common rail, and can communicate on the output side via a control valve arrangement with a low pressure side of the fuel injector.
  • the control valve arrangement opens, the pressure in the control chamber drops sharply, whereby the nozzle needle is displaced into its injection position releasing the injection nozzles and the plunger connected to the nozzle needle is pushed into the control chamber.
  • the control valve assembly has a sleeve-shaped closing body, which is aligned coaxially with an output bore of the control chamber and slidably disposed on an equiaxial to the output bore guide rod.
  • the sleeve-shaped closing body In the closed position, the sleeve-shaped closing body cooperates with a concentric to the output bore annular seat, closing body and seat are suitably designed so that the closing body contacts the seat on a ring line in its closed position, the diameter of the inner diameter of the sleeve-shaped closing body and the outer diameter of the guide rod equivalent.
  • control valve arrangement The special The advantage of this control valve arrangement is that the high pressure occurring in the control chamber in the closing phase of the control valve arrangement exerts only radial forces on the sleeve-shaped closing body, but no forces in the axial direction. Accordingly, the closing body with actuators low power and operate largely free of inertia.
  • the guide rod is acted upon on its the output hole of the control chamber opposite end face in the closing phase of the closing body of the high pressure in the control chamber and must therefore be axially supported or anchored to a stationary part of the injector body. It is basically advantageous if there is no firm connection between the stationary part and the facing end of the guide rod, but the guide rod is supported only on impact on the stationary part.
  • the guide rod in the assembly of the fuel injector readily assume a position optimal for the toroid, without a fixed connection with a Guide rod axially supporting stationary part of the injector body to be prevented.
  • a limited wobbling mobility of the guide rod is made possible by the "loose" support of the guide rod on the stationary part. This is advantageous because it offers the closing body the opportunity to assume an optimal closed position on the assigned seat.
  • de guide rod has a plastically deformable end face and cooperates with a projection on a stationary part of the injector body.
  • the single FIGURE shows a fragmentary axial section of a fuel injector with control valve arrangement according to the invention.
  • the detail shown fuel injector has a multi-part injector body 1 with a valve body 2.
  • a control chamber 3 in which a plunger 4 operates Verdränger relatively, which is connected to a nozzle needle, not shown for controlling injectors, not shown.
  • the control chamber 3 communicates constantly via a throttle line 5 shown only schematically, which can enforce deviating from the graphic representation of the valve body 2, with a high-pressure source 100, usually a common rail.
  • a throttled outlet bore 6 for the control chamber 3 is arranged within the valve body 2.
  • This output bore 6 is controlled by a sleeve-shaped closing body 7, which cooperates with a concentric to the output bore 6, annular seat 8 on the upper end face of the valve body 2 in the drawing.
  • the outlet bore 6 is connected to a low-pressure space 9 provided in the injector body 1, which in turn communicates with a low-pressure region of an injection system, for example a pressureless tank 10.
  • a guide rod 11 is arranged, on which the closing body 7 is slidably disposed.
  • the annular gap between the outer circumference of the guide rod 11 and the inner circumference of the sleeve-shaped closing body 7 is formed as a sealing gap.
  • an armature 12 is arranged, which cooperates with an annular electromagnet arrangement 13.
  • the closing body 7 is tensioned against its seat 8.
  • the armature 12 and the closing body 7 are lifted against the force of the helical compression spring 14 from the illustrated closed position of the closing body 7 and placed in an upper end position in which the armature 12 on the annular pole pieces 13 'and 13 "of Electromagnet assembly 13.
  • the helical compression spring 14 returns the closing body 7 to the illustrated closed position.
  • the lower end of the guide rod 11 is acted upon by the hydraulic pressure within the closing body 7, so that the guide rod 11 is pushed with its upper end in the drawing against a bottom part 15 of the injector body 1.
  • the contact point between the guide rod 11 and the bottom part 15 is defined by the radial positions of several assembled components. Accordingly, the exact position of the contact point can be optimally determined only after installation. An optimal, positive fit for fixing the upper end of the guide rod 11 on the bottom part 15 can thus be done only after installation of the fuel injector and not in the item production of the bottom part 15.
  • the upper end face of the guide rod 11 is formed spherical and the bottom part 15 at least in the vicinity of the point of contact with the guide rod 11 consists of a plastically deformable material, the guide rod 11 in the bottom part 15 a forming a cup-shaped bed.
  • the effect is exploited that the spherical end face of the guide rod 11 with the facing end face of the bottom part 15 initially only a punctiform contact zone, so that the force acting on the lower end of the guide rod 11 fluid forces are removed to an extremely small area of the bottom part 15 and the aforementioned plastic deformation occurs.
  • guide rod 11 and bottom part 15 can be readily selected in a suitable manner, as a rule, it is sufficient if the guide rod 11 made of hardened steel and the bottom part 15 in the contact point of non-hardened material.
  • the guide rod 11 receives an optimal orientation or positive fixing on the bottom part 15 for this closed position. At later opening and closing strokes of the closing body 7, therefore, the closing body 7 is always guided by the guide rod 11 in the optimum closed position on the seat 8.
  • the positive engagement of the guide rod 11 on the bottom part 15 ensures that the guide rod 11 can not leave the optimal contact point on the bottom part 15 even under operating conditions with low fluid pressures in the control chamber 3 and within the closing body 7 even under the influence of larger disturbing forces.

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

Description

Die Erfindung bezieht sich auf eine Steuerventilanordnung eines Kraftstoffinjektors gemäß dem Oberbegriff des Anspruches 1 oder 2.The invention relates to a control valve arrangement of a fuel injector according to the preamble of claim 1 or 2.

Stand der TechnikState of the art

Ein Kraftstoffinjektor mit einer derartigen Steuerventilanordnung ist aus der DE 10 2006 050 045 A1 bekannt. Der in dieser Druckschrift dargestellte Kraftstoffinjektor besitzt zur Steuerung seiner Einspritzdüse eine Düsennadel, die mit einem Plunger verbunden ist, der in einer Steuerkammer verdrängerwirksam arbeitet. Die Steuerkammer ist über eine eingangsseitige Drosselleitung ständig mit einer Kraftstoff-Hochdruckquelle in der Regel ein sogenanntes Common Rail, verbunden und kann ausgangsseitig über eine Steuerventilanordnung mit einer Niederdruckseite des Kraftstoffinjektors kommunizieren. Sobald die Steuerventilanordnung öffnet, sinkt der Druck in der Steuerkammer stark ab, wobei die Düsennadel in ihre die Einspritzdüsen freigebende Einspritzlage verschoben und der mit der Düsennadel verbundene Plunger in die Steuerkammer eingeschoben wird. Sobald die Steuerventilanordnung schließt, wird die Steuerkammer über die eingangsseitige Drosselleitung mit Hochdruck aufgeladen und der Plunger ausgeschoben, wobei die Düsennadel ihre die Einspritzdüsen absperrende Schließlage einnimmt. Die Steuerventilanordnung besitzt einen hülsenförmigen Schließkörper, der gleichachsig zu einer Ausgangsbohrung der Steuerkammer ausgerichtet und auf einer zur Ausgangsbohrung gleichachsigen Führungsstange verschiebbar angeordnet ist. In Schließlage wirkt der hülsenförmige Schließkörper mit einem zur Ausgangsbohrung konzentrischen ringförmigen Sitz zusammen, wobei Schließkörper und Sitz zweckmäßig so ausgebildet sind, dass der Schließkörper in seiner Schließlage den Sitz an einer Ringlinie berührt, deren Durchmesser dem Innendurchmesser des hülsenförmigen Schließkörpers bzw. dem Außendurchmesser der Führungsstange entspricht. Der besondere Vorzug dieser Steuerventilanordnung liegt darin, dass der in der Steuerkammer in der Schließphase der Steuerventilanordnung auftretende Hochdruck auf den hülsenförmigen Schließkörper nur Radialkräfte, jedoch keinerlei Kräfte in Axialrichtung ausübt. Dementsprechend lässt sich der Schließkörper mit Aktoren geringer Leistung und weitestgehend trägheitsfrei betätigen. Die Führungsstange wird auf ihrer der Ausgangsbohrung der Steuerkammer gegenüberliegenden Stirnseite in der Schließphase des Schließkörpers vom Hochdruck in der Steuerkammer beaufschlagt und muss dementsprechend axial an einem stationären Teil des Injektorkörpers abgestützt bzw. verankert sein. Dabei ist es grundsätzlich vorteilhaft, wenn zwischen dem stationären Teil und dem zugewandten Ende der Führungsstange keine feste Verbindung vorliegt, sondern die Führungsstange lediglich auf Stoß am stationären Teil abgestützt ist. Auf diese Weise wird verhindert, dass unvermeidliche Fertigungstoleranzen zu Schwierigkeiten bei der Montage des Kraftstoffinjektors führen können. Wenn beispielsweise als Aktor für den Schließkörper eine Elektromagnetanordnung mit einer zur Führungsstange konzentrischen Magnetspule und einem damit zusammenwirkenden schließkörperseitigen Anker vorgesehen ist, kann die Führungsstange bei der Montage des Kraftstoffinjektors ohne weiteres eine zur Ringspule optimale Position einnehmen, ohne daran durch eine feste Verbindung mit einem die Führungsstange axial abstützenden stationären Teil des Injektorkörpers gehindert zu werden. Im Übrigen wird durch die "lose" Abstützung der Führungsstange am stationären Teil auch eine begrenzte Taumelbeweglichkeit der Führungsstange ermöglicht. Dies ist vorteilhaft, da damit dem Schließkörper die Möglichkeit geboten wird, eine optimale Schließlage auf dem zugeordneten Sitz einzunehmen.A fuel injector with such a control valve assembly is known from DE 10 2006 050 045 A1 known. The fuel injector shown in this document has to control its injection nozzle, a nozzle needle which is connected to a plunger, which works in a displacement chamber Verdrängerwirksam. The control chamber is connected via an input-side throttle line with a high-pressure fuel source usually a so-called common rail, and can communicate on the output side via a control valve arrangement with a low pressure side of the fuel injector. As soon as the control valve arrangement opens, the pressure in the control chamber drops sharply, whereby the nozzle needle is displaced into its injection position releasing the injection nozzles and the plunger connected to the nozzle needle is pushed into the control chamber. As soon as the control valve arrangement closes, the control chamber is charged with high pressure via the inlet-side throttle line and the plunger is pushed out, whereby the nozzle needle assumes its closing position blocking the injection nozzles. The control valve assembly has a sleeve-shaped closing body, which is aligned coaxially with an output bore of the control chamber and slidably disposed on an equiaxial to the output bore guide rod. In the closed position, the sleeve-shaped closing body cooperates with a concentric to the output bore annular seat, closing body and seat are suitably designed so that the closing body contacts the seat on a ring line in its closed position, the diameter of the inner diameter of the sleeve-shaped closing body and the outer diameter of the guide rod equivalent. The special The advantage of this control valve arrangement is that the high pressure occurring in the control chamber in the closing phase of the control valve arrangement exerts only radial forces on the sleeve-shaped closing body, but no forces in the axial direction. Accordingly, the closing body with actuators low power and operate largely free of inertia. The guide rod is acted upon on its the output hole of the control chamber opposite end face in the closing phase of the closing body of the high pressure in the control chamber and must therefore be axially supported or anchored to a stationary part of the injector body. It is basically advantageous if there is no firm connection between the stationary part and the facing end of the guide rod, but the guide rod is supported only on impact on the stationary part. In this way it is prevented that inevitable manufacturing tolerances can lead to difficulties in mounting the fuel injector. If, for example, as an actuator for the closing body an electromagnet arrangement is provided with a concentric to the guide rod magnetic coil and a cooperating closing body side armature, the guide rod in the assembly of the fuel injector readily assume a position optimal for the toroid, without a fixed connection with a Guide rod axially supporting stationary part of the injector body to be prevented. Incidentally, a limited wobbling mobility of the guide rod is made possible by the "loose" support of the guide rod on the stationary part. This is advantageous because it offers the closing body the opportunity to assume an optimal closed position on the assigned seat.

Als weiterer Stand der Technik sind die DE 10 2006 021 736 und die DE 10 2007 025961 zu nennen.As a further prior art, the DE 10 2006 021 736 and the DE 10 2007 025961 to call.

Offenbarung der ErfindungDisclosure of the invention

Die bisher vorgesehene lose Abstützung der Führungsstange am zugeordneten stationären Teil des Injektorkörpers bringt allerdings den Nachteil mit sich, dass die Führungsstange bei starken Störkräften auf dem stationären Teil in Radialrichtung aus einer optimalen Lage zumindest vorübergehend entfernt werden kann.However, the previously proposed loose support of the guide rod on the associated stationary part of the injector body brings with it the disadvantage that the guide rod can be at least temporarily removed with strong disturbing forces on the stationary part in the radial direction from an optimal position.

Deshalb ist es Aufgabe der Erfindung, eine Konstruktion zu schaffen, bei der sich die Führungsstange am stationären Teil ohne zusätzlichen Herstellungsaufwand radial fixieren lässt.It is therefore an object of the invention to provide a construction in which the guide rod can be fixed radially on the stationary part without additional manufacturing effort.

Dies wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 bzw. - in "kinematischer Umkehr" - die kennzeichnenden Merkmale des Anspruches 2 gelöst. Die Erfindung beruht auf dem allgemeinen Gedanken, an dem die Führungsstange axial abstützenden stationären Teil des Injektorkörpers oder an der zugewandten Stirnseite der Führungsstange plastisch verformbares Material vorzusehen, so dass ein am jeweils anderen Teil vorgesehener Vorsprung sich in das verformbare Material einsenken kann, wenn die Führungsstange auf ihrer der Ausgangsbohrung der Steuerkammer gegenüberliegenden Stirnseite durch Hochdruck beaufschlagt wird. Da die Steuerventilanordnung eines Kraftstoffinjektors nach dessen Montage ohnehin auf Dichtigkeit überprüft werden muss und dabei mit fluidischem Hochdruck beaufschlagt wird, lässt sich die Prüfphase des Kraftstoffinjektors bei dessen Herstellung für die Einsenkung des Vorsprunges in das plastisch verformbare Material nutzen. Im Ergebnis erfordert daher die erfindungsgemäße Konstruktion keinerlei zusätzlichen Herstellungsaufwand.This is inventively achieved by the characterizing features of claim 1 or - in "kinematic reversal" - the characterizing features of claim 2. The invention is based on the general idea of providing the guide rod axially supporting stationary part of the injector body or on the facing end side of the guide rod plastically deformable material, so that a provided on the other part projection can sink into the deformable material when the guide rod is acted upon by its high pressure on its front side opposite the output bore of the control chamber. Since the control valve arrangement of a fuel injector after its assembly anyway has to be checked for leaks and is acted upon by fluidic high pressure, the test phase of the fuel injector can be used in the manufacture of the depression of the projection in the plastically deformable material. As a result, therefore, the inventive construction requires no additional manufacturing effort.

Dabei ist entweder vorgesehen, den Vorsprung an der Führungsstange anzuordnen und als Abstützung für die Führungsstange am Injektorkörper ein plastisch verformbares Teil vorzusehen.It is either provided to arrange the projection on the guide rod and provide a support for the guide rod on the injector a plastically deformable part.

Alternativ ist jedoch auch eine umgekehrte Anordnung möglich, bei der de Führungsstange eine plastisch verformbare Stirnseite aufweist und mit einem Vorsprung an einem stationären Teil des Injektorkörpers zusammenwirkt.Alternatively, however, a reverse arrangement is possible in which de guide rod has a plastically deformable end face and cooperates with a projection on a stationary part of the injector body.

Im Übrigen wird hinsichtlich bevorzugter Merkmale der Erfindung auf die Ansprüche und die nachfolgende Erläuterung der Zeichnung verwiesen, anhand der besonders bevorzugte Ausführungsformen der Erfindung näher beschrieben werden.Incidentally, with regard to preferred features of the invention, reference is made to the claims and the following explanation of the drawing, are described in detail with reference to the particularly preferred embodiments of the invention.

Schutz wird nicht nur für angegebene oder dargestellte Merkmalskombinationen, sondern auch für prinzipiell beliebige Kombinationen der angegebenen oder dargestellten Einzelmerkmale beansprucht.Protection is claimed not only for specified or illustrated feature combinations, but also for any combination of the specified or illustrated individual features.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die einzige Figur zeigt einen ausschnittsweisen Axialschnitt eines Kraftstoffinjektors mit erfindungsgemäßer Steuerventilanordnung.The single FIGURE shows a fragmentary axial section of a fuel injector with control valve arrangement according to the invention.

Ausführungsform der ErfindungEmbodiment of the invention

Der ausschnittsweise dargestellte Kraftstoffinjektor besitzt einen mehrteiligen Injektorkörper 1 mit einem Ventilkörper 2. An diesen Ventilkörper 2 schließt sich eine Steuerkammer 3 an, in der ein Plunger 4 verdrängerwirksam arbeitet, welcher mit einer nicht dargestellten Düsennadel zur Steuerung nicht dargestellter Einspritzdüsen verbunden ist. Wenn der Plunger 4 nach abwärts verschoben wird, schließt die Düsennadel die Einspritzdüsen, während die Einspritzdüsen geöffnet sind, wenn der Plunger 4 nach aufwärts verschoben ist. Die Steuerkammer 3 kommuniziert ständig über eine nur schematisiert dargestellte Drosselleitung 5, die abweichend von der zeichnerischen Darstellung den Ventilkörper 2 durchsetzen kann, mit einer Hochdruckquelle 100, in der Regel ein Common Rail. Innerhalb des Ventilkörpers 2 ist eine gedrosselte Ausgangsbohrung 6 für die Steuerkammer 3 angeordnet. Diese Ausgangsbohrung 6 wird von einem hülsenförmigen Schließkörper 7 gesteuert, der mit einem zur Ausgangsbohrung 6 konzentrischen, ringförmigen Sitz 8 auf der in der Zeichnung oberen Stirnseite des Ventilkörpers 2 zusammenwirkt.The detail shown fuel injector has a multi-part injector body 1 with a valve body 2. At this valve body 2 is followed by a control chamber 3, in which a plunger 4 operates Verdrängerwirksam, which is connected to a nozzle needle, not shown for controlling injectors, not shown. When the plunger 4 is displaced downwardly, the nozzle needle closes the injectors while the injectors are opened when the plunger 4 is displaced upward. The control chamber 3 communicates constantly via a throttle line 5 shown only schematically, which can enforce deviating from the graphic representation of the valve body 2, with a high-pressure source 100, usually a common rail. Within the valve body 2, a throttled outlet bore 6 for the control chamber 3 is arranged. This output bore 6 is controlled by a sleeve-shaped closing body 7, which cooperates with a concentric to the output bore 6, annular seat 8 on the upper end face of the valve body 2 in the drawing.

Wenn der Schließkörper 7 vom Sitz 8 abhebt, wird die Ausgangsbohrung 6 mit einem im Injektorkörper 1 vorgesehenen Niederdruckraum 9 verbunden, der seinerseits mit einem Niederdruckbereich eines Einspritzsystems kommuniziert, beispielsweise einem drucklosen Tank 10.When the closing body 7 lifts off from the seat 8, the outlet bore 6 is connected to a low-pressure space 9 provided in the injector body 1, which in turn communicates with a low-pressure region of an injection system, for example a pressureless tank 10.

Wenn der Schließkörper 7 die zeichnerisch dargestellte Schließlage einnimmt, wird die Steuerkammer 3 auf Hochdruck aufgeladen, und der Plunger 4 wird mit der Düsennadel nach abwärts in die Schließlage der Düsennadel geschoben. Sobald der Schließkörper 7 vom Sitz 8 abhebt, sinkt der Druck in der Steuerkammer 3 stark ab, und der Plunger 4 wird zusammen mit der Düsennadel nach aufwärts geschoben, so dass die Düsennadel die Einspritzdüsen freigibt. Dieser Aufwärtshub wird durch auf die Düsennadel einwirkende hydraulische Kräfte bzw. eine Öffnungsfeder (nicht dargestellt) ermöglicht.When the closing body 7 assumes the closed position shown in the drawing, the control chamber 3 is charged to high pressure, and the plunger 4 is connected to the nozzle needle pushed downwards into the closed position of the nozzle needle. As soon as the closing body 7 lifts off the seat 8, the pressure in the control chamber 3 drops sharply, and the plunger 4 is pushed upwards together with the nozzle needle, so that the nozzle needle releases the injection nozzles. This upward stroke is made possible by hydraulic forces acting on the nozzle needle or an opening spring (not shown).

Innerhalb des hülsenförmigen Schließkörpers 7 ist eine Führungsstange 11 angeordnet, auf der der Schließkörper 7 verschiebbar angeordnet ist. Dabei ist der Ringspalt zwischen dem Außenumfang der Führungsstange 11 und dem Innenumfang des hülsenförmigen Schließkörpers 7 als Dichtspalt ausgebildet.Within the sleeve-shaped closing body 7, a guide rod 11 is arranged, on which the closing body 7 is slidably disposed. In this case, the annular gap between the outer circumference of the guide rod 11 and the inner circumference of the sleeve-shaped closing body 7 is formed as a sealing gap.

Am in der Zeichnung oberen Ende des Schließkörpers 7 ist ein Anker 12 angeordnet, der mit einer ringförmigen Elektromagnetanordnung 13 zusammenwirkt. Mittels einer zur Führungsstange 11 konzentrischen Schraubendruckfeder 14 wird der Schließkörper 7 gegen seinen Sitz 8 gespannt. Bei elektrischer Bestromung der Elektromagnetanordnung 13 werden der Anker 12 und der Schließkörper 7 gegen die Kraft der Schraubendruckfeder 14 aus der dargestellten Schließlage des Schließkörpers 7 ausgehoben und in eine obere Endlage gebracht, in der der Anker 12 auf den ringförmigen Polschuhen 13' und 13" der Elektromagnetanordnung 13 aufsitzt. Sobald die elektrische Bestromung der Elektromagnetanordnung 13 abgeschaltet wird, stellt die Schraubendruckfeder 14 den Schließkörper 7 wieder in die dargestellte Schließlage.At the upper end of the closing body 7 in the drawing, an armature 12 is arranged, which cooperates with an annular electromagnet arrangement 13. By means of a concentric to the guide rod 11 helical compression spring 14, the closing body 7 is tensioned against its seat 8. When electrical energization of the solenoid assembly 13, the armature 12 and the closing body 7 are lifted against the force of the helical compression spring 14 from the illustrated closed position of the closing body 7 and placed in an upper end position in which the armature 12 on the annular pole pieces 13 'and 13 "of Electromagnet assembly 13. As soon as the electric energization of the electromagnet arrangement 13 is switched off, the helical compression spring 14 returns the closing body 7 to the illustrated closed position.

Das untere Ende der Führungsstange 11 wird vom hydraulischen Druck innerhalb des Schließkörpers 7 beaufschlagt, so dass die Führungsstange 11 mit ihrem in der Zeichnung oberen Ende gegen ein Bodenteil 15 des Injektorkörpers 1 angeschoben wird. Der Kontaktpunkt zwischen der Führungsstange 11 und dem Bodenteil 15 wird über die radialen Lagen mehrerer montierter Bauteile definiert. Dementsprechend lässt sich die exakte Lage des Kontaktpunktes erst nach erfolgter Montage optimal bestimmen. Eine optimale, formschlüssige Maßnahme zur Fixierung des oberen Endes der Führungsstange 11 am Bodenteil 15 kann also erst nach Montage des Kraftstoffinjektors und nicht bei der Einzelteilfertigung des Bodenteils 15 erfolgen.The lower end of the guide rod 11 is acted upon by the hydraulic pressure within the closing body 7, so that the guide rod 11 is pushed with its upper end in the drawing against a bottom part 15 of the injector body 1. The contact point between the guide rod 11 and the bottom part 15 is defined by the radial positions of several assembled components. Accordingly, the exact position of the contact point can be optimally determined only after installation. An optimal, positive fit for fixing the upper end of the guide rod 11 on the bottom part 15 can thus be done only after installation of the fuel injector and not in the item production of the bottom part 15.

Erfindungsgemäß ist nun vorgesehen, den Kontaktpunkt zwischen Führungsstange 11 und Bodenteil 15 bei einer im Rahmen der Herstellung des Kraftstoffinjektors ohnehin notwendigen Druckprüfung festzulegen. Im Verlauf dieser Druckprüfung wird (bei elektrisch stromloser Elektromagnetanordnung 13) die Drosselleitung 5 mit Hochdruck in der Größenordnung von 2000 bar beaufschlagt. Dies hat zur Folge, dass die Steuerkammer 3 und die zunächst durch den Schließkörper 7 gegenüber dem Niederdruckraum 9 abgesperrte Ausgangsbohrung 6 auf entsprechend hohen Druck aufgeladen werden. Dieser Hochdruck wirkt auf das untere Stirnende der Führungsstange 11, so dass diese gegen das Bodenteil 15 mit entsprechend großer Kraft angedrückt wird. Typischerweise liegt die Andruckkraft bei größenordnungsmäßig 500 N. Indem nun die obere Stirnseite der Führungsstange 11 ballig ausgebildet ist und das Bodenteil 15 zumindest in der Umgebung des Kontaktpunktes mit der Führungstange 11 aus einem plastisch verformbaren Material besteht, kann sich die Führungsstange 11 im Bodenteil 15 ein gelenkschalenförmiges Bett formen. Hier wird der Effekt ausgenutzt, dass die ballige Stirnseite der Führungsstange 11 mit der zugewandten Planfläche des Bodenteiles 15 zunächst nur eine punktförmige Berührungszone hat, so dass die auf das untere Ende der Führungsstange 11 wirkenden fluidischen Kräfte auf einen extrem kleinen Bereich des Bodenteils 15 abgetragen werden und die vorgenannte plastische Verformung auftritt. Diese plastische Verformung wird beendet, sobald die ballige Stirnseite der Führungsstange 11 tiefer in das Bodenteil 15 eingedrungen ist und auf einer Berührungsfläche aufliegt, deren Größe für die Abtragung der Anschubkräfte der Führungsstange 11 ohne weitere plastische Verformung des Bodenteiles 15 ausreicht.According to the invention, it is now provided to fix the point of contact between the guide rod 11 and the bottom part 15 at a pressure test which is anyway necessary in the context of production of the fuel injector. In the course of this pressure test, the throttling line 5 is subjected to high-pressure in the order of magnitude of 2000 bar (in the case of an electrically electroless electromagnet arrangement 13). This has the consequence that the control chamber 3 and the first shut off by the closing body 7 relative to the low pressure chamber 9 outlet bore 6 are charged to a correspondingly high pressure. This high pressure acts on the lower end face of the guide rod 11, so that it is pressed against the bottom part 15 with a correspondingly large force. Typically, the pressure force is on the order of 500 N. Now that the upper end face of the guide rod 11 is formed spherical and the bottom part 15 at least in the vicinity of the point of contact with the guide rod 11 consists of a plastically deformable material, the guide rod 11 in the bottom part 15 a forming a cup-shaped bed. Here, the effect is exploited that the spherical end face of the guide rod 11 with the facing end face of the bottom part 15 initially only a punctiform contact zone, so that the force acting on the lower end of the guide rod 11 fluid forces are removed to an extremely small area of the bottom part 15 and the aforementioned plastic deformation occurs. This plastic deformation is terminated as soon as the spherical end face of the guide rod 11 has penetrated deeper into the bottom part 15 and rests on a contact surface whose size is sufficient for the removal of the starting forces of the guide rod 11 without further plastic deformation of the bottom part 15.

Die Materialien von Führungsstange 11 und Bodenteil 15 können ohne weiteres in geeigneter Weise ausgewählt werden, in der Regel genügt es, wenn die Führungsstange 11 aus gehärtetem Stahl und das Bodenteil 15 im Bereich des Kontaktpunktes aus nicht gehärtetem Material bestehen.The materials of guide rod 11 and bottom part 15 can be readily selected in a suitable manner, as a rule, it is sufficient if the guide rod 11 made of hardened steel and the bottom part 15 in the contact point of non-hardened material.

Da die Hochdruckbeaufschlagung des Kraftstoffinjektors in dessen Prüfphase in einer optimalen Schließlage des Schließkörpers 7 auf dem Sitz 8 erfolgt, erhält die Führungsstange 11 eine für diese Schließlage optimale Ausrichtung bzw. formschlüssige Fixierung am Bodenteil 15. Bei späteren Öffnungs- und Schließhüben des Schließkörpers 7 wird also der Schließkörper 7 von der Führungsstange 11 immer in die optimale Schließlage auf dem Sitz 8 geführt.Since the high pressure loading of the fuel injector takes place in its test phase in an optimal closed position of the closing body 7 on the seat 8, the guide rod 11 receives an optimal orientation or positive fixing on the bottom part 15 for this closed position. At later opening and closing strokes of the closing body 7, therefore, the closing body 7 is always guided by the guide rod 11 in the optimum closed position on the seat 8.

Durch den formschlüssigen Eingriff der Führungsstange 11 am Bodenteil 15 wird sicher gewährleistet, dass die Führungsstange 11 auch bei Betriebsphasen mit geringen fluidischen Drücken in der Steuerkammer 3 sowie innerhalb des Schließkörpers 7 den optimalen Kontaktpunkt am Bodenteil 15 auch unter dem Einfluss größerer Störkräfte nicht verlassen kann.The positive engagement of the guide rod 11 on the bottom part 15 ensures that the guide rod 11 can not leave the optimal contact point on the bottom part 15 even under operating conditions with low fluid pressures in the control chamber 3 and within the closing body 7 even under the influence of larger disturbing forces.

Claims (6)

  1. Control valve arrangement (7, 8, 11) of a fuel injector, having a sleeve-shaped closing body (7) which is arranged axially displaceably on a guide rod (11), one end face of which is supported on a stationary part (15) and the other end face of which is loaded in phases with high pressure during operation of the fuel injector, characterized in that at least one end-side projection, the cross section of which has a smaller size in comparison with the cross section of the guide rod (11), is arranged at the one end face of the guide rod (11), and in that the stationary part (15) which supports the guide rod (11) can be deformed plastically by the projection in the case of a high pressure which acts on the other end face of the guide rod (11).
  2. Control valve arrangement (7, 8, 11) of a fuel injector, having a sleeve-shaped closing body (7) which is arranged axially displaceably on a guide rod (11), one end face of which is supported on a stationary part (15) and the other end face of which is loaded in phases with fluidic high pressure during operation of the fuel injector, characterized in that at least one projection which is directed in the direction of the facing end side of the guide rod (11) and has a small cross section in comparison with the cross section of the guide rod is arranged on that side of the stationary part (15) which lies opposite the one end face of the guide rod (11), and in that the abovementioned end side can be deformed plastically by the projection in the case of a fluidic high pressure which acts on the other end face of the guide rod with sinking of the projection into the end side.
  3. Control valve arrangement according to Claim 1 or 2, characterized in that a crowned projection is provided which, before the plastic deformation of the part which interacts with it, first of all has only approximately punctiform contact with the interacting part.
  4. Control valve arrangement according to Claims 1 and 3, characterized in that the one end face of the guide rod (11) has a crowned end side.
  5. Control valve arrangement according to one of Claims 1 to 4, characterized in that the projection is composed of hardened material and the part (15) which interacts with it is composed of non-hardened material.
  6. Method for producing a fuel injector with a control valve arrangement according to one of Claims 1 to 5, characterized in that the fuel injector runs through a test phase after being assembled, in which test phase the fuel injector is loaded with high pressure, the optimum contact point between the guide rod (11) and the bottom part (15) being fixed by way of the plastic deformation.
EP11700513.2A 2010-02-02 2011-01-03 Control valve assembly of a fuel injector Active EP2531715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010001486 DE102010001486A1 (en) 2010-02-02 2010-02-02 Control valve arrangement of a fuel injector
PCT/EP2011/050014 WO2011095367A1 (en) 2010-02-02 2011-01-03 Control valve assembly of a fuel injector

Publications (2)

Publication Number Publication Date
EP2531715A1 EP2531715A1 (en) 2012-12-12
EP2531715B1 true EP2531715B1 (en) 2014-11-19

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EP11700513.2A Active EP2531715B1 (en) 2010-02-02 2011-01-03 Control valve assembly of a fuel injector

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EP (1) EP2531715B1 (en)
CN (1) CN102741542B (en)
DE (1) DE102010001486A1 (en)
RU (1) RU2554696C2 (en)
WO (1) WO2011095367A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224203A1 (en) 2012-12-21 2014-06-26 Robert Bosch Gmbh Magnetic assembly for a fuel injector, method for producing a magnet assembly and fuel injector
DE102013221554A1 (en) * 2013-10-23 2015-04-23 Robert Bosch Gmbh fuel injector
DE102015202726A1 (en) 2015-02-16 2016-08-18 Robert Bosch Gmbh Control valve assembly
DE102016209022A1 (en) 2016-05-24 2017-11-30 Robert Bosch Gmbh Control valve for a fuel injection valve
DE102016222871A1 (en) 2016-11-21 2018-05-24 Robert Bosch Gmbh fuel injector
DE102016223287A1 (en) 2016-11-24 2018-05-24 Robert Bosch Gmbh Control valve for a fuel injector, fuel injector
DE102018201039A1 (en) 2018-01-24 2019-07-25 Robert Bosch Gmbh fuel injector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021736A1 (en) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Fuel injector with pressure compensated control valve
DE102006050045A1 (en) 2006-10-24 2008-04-30 Robert Bosch Gmbh Injector for injecting fuel into combustion chamber of internal-combustion engine, has bolt that is supported and fixed in axial direction by control chamber away to injector component
DE102007025961A1 (en) * 2007-06-04 2008-12-11 Robert Bosch Gmbh injector
DE102008003348A1 (en) * 2008-01-07 2009-07-09 Robert Bosch Gmbh fuel injector

Also Published As

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RU2554696C2 (en) 2015-06-27
EP2531715A1 (en) 2012-12-12
WO2011095367A1 (en) 2011-08-11
CN102741542B (en) 2015-03-25
DE102010001486A1 (en) 2011-08-04
RU2012137146A (en) 2014-03-10
CN102741542A (en) 2012-10-17

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