EP2470776A1 - Fuel injector for an internal combustion engine - Google Patents

Fuel injector for an internal combustion engine

Info

Publication number
EP2470776A1
EP2470776A1 EP10735254A EP10735254A EP2470776A1 EP 2470776 A1 EP2470776 A1 EP 2470776A1 EP 10735254 A EP10735254 A EP 10735254A EP 10735254 A EP10735254 A EP 10735254A EP 2470776 A1 EP2470776 A1 EP 2470776A1
Authority
EP
European Patent Office
Prior art keywords
leakage
throttle plate
fuel injector
channel
throttle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10735254A
Other languages
German (de)
French (fr)
Other versions
EP2470776B1 (en
Inventor
Dietmar Uhlmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2470776A1 publication Critical patent/EP2470776A1/en
Application granted granted Critical
Publication of EP2470776B1 publication Critical patent/EP2470776B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to a fuel injector with an actuator module arranged in a holding body, wherein the holding body is clamped by means of a clamping nut with a nozzle body with the interposition of at least one formed as throttle plate, the throttle plate of at least one high-pressure channel, an inlet channel with an inlet throttle and a Drain passage is penetrated with an outlet throttle and wherein between the actuator module and the throttle plate actuated by the actuator module valve, comprising at least one valve pin and a sealing sleeve, is arranged to form a one of the throttle plate facing leakage chamber.
  • Such a fuel injector is known from DE 10 2007 040 115 Al.
  • This fuel injector has the structure described above, wherein in the leakage chamber the generated between the centering pin and the sealing sleeve per- manentleckagemenge of fuel is added.
  • This permanent leakage quantity is discharged from the leakage chamber via a drain line into a low-pressure system or a return system.
  • the drain line is incorporated into the throttle plate in the sealing surface between the throttle plate and the holding body receiving the actuator module and the valve.
  • a further fuel injector in which the intermediate body is designed as a high-pressure body.
  • the intermediate body is designed as a high-pressure body.
  • at least one annular leakage channel is incorporated, which surrounds the passage of the high-pressure passage through the high-pressure body.
  • Leakage channel is arranged so that taking into account the the surface pressures is given a reliable seal of the adjacent components.
  • the invention is based on the object to provide a fuel injector len, in which the leakage discharge from the leakage chamber is ensured without affecting the tightness of the fuel injector in the adjacent areas to the throttle plate.
  • a horizontal leakage drainage channel is recessed, which extends from the cylindrical outer periphery of the throttle plate to an area below the leakage space and which is hydraulich connected to the leakage chamber via a leakage channel.
  • the leakage channel is preferably arranged vertically directly below the leakage chamber, and the fuel to be discharged is discharged from the mouth of the leakage drainage channel into the cylindrical outer periphery of the throttle plate in a suitable manner.
  • Leckageab USAkanal is inserted into the throttle plate, which is hydraulich connected to the leakage drainage channel.
  • This Leckageab USAkanal is also arranged vertically and opens in a further embodiment in a
  • annular space disposed between the throttle plate and a valve body receiving the valve.
  • the annular space can be embedded in the throttle plate and / or the valve body.
  • the valve body may be formed as a further separate intermediate body or be part of the holding body. From the annulus of the leakage fuel via a drain line in a
  • the leakage drainage channel is a leakage drainage bore, which in turn has a diameter of at least approximately 1.2 mm in a further embodiment.
  • a sleeve extending between the leakage channel and the leakage discharge channel is inserted into the leakage drainage channel or the leakage drainage hole.
  • This sleeve compensates for the local loss of stiffness possibly resulting in the throttle plate and further increases the values for the local surface pressures at the corresponding end faces.
  • the extension of the sleeve between the leakage channel and the Leckageab technicallykanal ensures that radially the entire sealed area has a sufficiently high surface pressure.
  • the sleeve may be made of the same ferrous material as the throttle plate, but it is also possible to produce the sleeve of a higher quality, especially solid ferrous material. The sleeve is after the deburring of the
  • the sleeve has an inner diameter of 0.6 mm. This diameter is sufficient so that there is no throttling of the leakage amount carried out.
  • the leakage drainage channel or the leakage drainage bore is arranged on the side of the throttle plate opposite the high-pressure channel. This site makes sense because in this area, the throttle plate is free of further breakthroughs.
  • FIG. 1 shows a control valve-side section of a fuel injector for a
  • FIG 2 is a perspective view of the throttle plate
  • Figure 3 is a side view of the throttle plate with all channels in the throttle plate and a drain hole without inserted sleeve and
  • Figure 4 is a side view of the throttle plate with all channels in the throttle plate and with a sleeve inserted into the drain hole.
  • FIG. 1 shows a control valve side portion of a fuel injector for a common rail system of a diesel injection.
  • an electrically actuated actuator module 2 is used, which is actuated by an electronic engine control unit according to the operator requirements.
  • the actuator module 2 is preferably a piezoactuator, which is in the representation in a non-switched state.
  • the actuator module 2 cooperates with a valve pin 4, which in a sealing sleeve 5 against the force of a valve spring 6 lutzsbe- is arranged wegbar.
  • the valve pin 4 has a sealing surface 7 which, in the closed state of the valve, cooperates sealingly with a seat surface 8 incorporated in a valve plate 9.
  • a valve space 10 is formed below the seat surface 8, which extends partially surrounding the sealing sleeve 5 inserted in the valve plate 9 as far as a throttle plate-side end of the valve plate 9.
  • the actuating lug 3 moves the valve pin 4 in the direction of the throttle plate 11 adjoining the valve plate 9 and lifts the sealing surface 7 of the valve pin 4 from the seat surface 8 of the valve plate 9, so that a flow connection between the Valve chamber 10 and formed in the holding body 1 low-pressure space, which is part of a return system for fuel is formed.
  • a nozzle body 12 connects, by means of a
  • Clamping nut 13 with the inclusion of the throttle plate 11 and the valve plate 9 with the holding body 1 is firmly clamped.
  • a nozzle needle not shown is guided axially displaceable, wherein only one end portion of a nozzle needle piston 14 is visible from the nozzle needle.
  • the nozzle needle piston 14 delimits a control chamber 17 which is located on the nozzle needle piston
  • control chamber 17 opens an inlet channel 18 ( Figure 2) with an inlet throttle arranged therein and a drain channel 19 ( Figure 2) with an outlet throttle arranged therein.
  • the inlet channel 18 is connected to a high-pressure line 15, via the fuel, in particular diesel fuel, through a high pressure passage 16 in the
  • Throttle plate 11 is fed to a nozzle needle pressure chamber explained below.
  • the drainage channel 19 connects the control chamber 17 with the valve chamber 10 so that in the idle state in the valve chamber 10, in the control chamber 17 and in the nozzle needle pressure chamber, the fuel pressure prevailing in the high-pressure line 15 prevails, for example 2000 bar.
  • the nozzle needle In order to inject fuel into the combustion chamber of the internal combustion engine assigned to a fuel injector, the nozzle needle must be moved from a closed position to an open position. The fuel then passes from the nozzle needle pressure chamber via injection channels in the nozzle body the combustion chamber. To open the nozzle needle, the nozzle needle piston 14 must be moved in the direction of the throttle plate 11.
  • the actuator module 2 is switched.
  • the sealing surface 7 of the valve pin 4 is lifted off the seat 8 and in the
  • Valve space 10 located fuel can flow into the low pressure space, so that the pressure prevailing in the valve chamber 10 fuel pressure is reduced. Fuel also flows out of the control chamber 17 through the outlet channel 19, so that a pressure reduction is also effected in the control chamber 17 which triggers the movement of the nozzle needle piston 14 in the direction of the throttle plate 11.
  • the fuel pressure in the control chamber 17 and the valve chamber 10 is again increased to such a pressure sufficient to adjust the nozzle needle piston 14 and thus the nozzle needle in the closed position.
  • a horizontal leakage drainage channel 20 is incorporated into the throttle plate 11 which is connected to the leakage space 21 via a vertical leakage channel 22. From the leakage drainage passage 20, the leakage fuel is discharged via a leakage discharge passage 23 into an annular space 24a, which is incorporated in the valve plate 9 and which is connected to the low-pressure system.
  • annular space 24b In the throttle plate 11 opposite to the annular space 24a, a further annular space 24b is incorporated.
  • FIG. 2 shows a perspective illustration of the throttle plate 11 with the leakage drainage channel 20 with the opening leakage channel 22 and leakage discharge channel 23.
  • the high-pressure channel 16 is arranged, while approximately at right angles to an imaginary connecting line between the leakage outlet channel 20 and the high-pressure channel 16 two pin holes 26a, 26b are arranged eccentrically to the center of the throttle plate 11. In this pin holes 26 a, 26 b fixing pins are used, which in corresponding
  • FIG 3 shows a side view of the throttle plate 11 with all channels / or holes in the throttle plate 11.
  • the leakage drain passage 20 is formed in this figure caseless, while in the corresponding figure 4 in the leakage drain passage 1, a sleeve 25 is inserted.
  • the sleeve 25 has an inner diameter of about 0.6 mm and extends between the leakage channel 22 and the Leckageabfederkanal 23rd

Landscapes

  • 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)

Abstract

The invention relates to a fuel injector comprising an actuator module 2 arranged in a holding body 1, wherein the holding body 1 is braced by means of a tension nut 13 to a nozzle body 12 by means of at least one interposed intermediate body designed as a throttle plate 11, wherein the throttle plate 11 is penetrated by at least one high pressure channel 16, an inflow channel 18 having an inflow throttle, and an outflow channel 19 having an outflow throttle, and wherein a valve actuated by the actuator module 2, said valve having at least one valve pin 4 and a sealing sleeve 5, is arranged between the actuator module 2 and the throttle plate 11, forming a leakage chamber 21 facing the throttle plate 11. According to the invention, a fuel injector is provided, wherein the leakage discharge out of the leakage chamber 21 is ensured without impairing the tightness of the fuel injector in the areas adjacent to the throttle plate 11. This is achieved in that a horizontal leakage outlet channel 20, which extends from the cylindrical outer circumference of the throttle plate 11 to a region underneath the leakage chamber 21 and is hydraulically connected to the leakage chamber 21 by way of a leakage channel 22, is recessed in the throttle plate 11.

Description

Beschreibung  description
Titel title
Kraftstoffinjektor für eine Brennkraftmaschine Stand der Technik  Fuel injector for an internal combustion engine Prior art
Die Erfindung betrifft einen Kraftstoffinjektor mit einem in einem Haltekörper angeordneten Aktormodul, wobei der Haltekörper mit einem Düsenkörper unter Zwischenschaltung zumindest eines als Drosselplatte ausgebildeten Zwischen- körpers mittels einer Spannmutter verspannt ist, wobei die Drosselplatte von zumindest einem Hochdruckkanal, einem Zulaufkanal mit einer Zulaufdrossel sowie einem Ablaufkanal mit einer Ablaufdrossel durchdrungen ist und wobei zwischen dem Aktormodul und der Drosselplatte ein von dem Aktormodul betätigtes Ventil, aufweisend zumindest einen Ventilbolzen und eine Dichthülse, unter Bildung ei- nes der Drosselplatte zugewandten Leckageraum angeordnet ist. The invention relates to a fuel injector with an actuator module arranged in a holding body, wherein the holding body is clamped by means of a clamping nut with a nozzle body with the interposition of at least one formed as throttle plate, the throttle plate of at least one high-pressure channel, an inlet channel with an inlet throttle and a Drain passage is penetrated with an outlet throttle and wherein between the actuator module and the throttle plate actuated by the actuator module valve, comprising at least one valve pin and a sealing sleeve, is arranged to form a one of the throttle plate facing leakage chamber.
Ein derartiger Kraftstoffinjektor ist aus der DE 10 2007 040 115 Al bekannt. Dieser Kraftstoffinjektor weist den zuvor dargestellten Aufbau auf, wobei in dem Leckageraum die zwischen dem Zentrierbolzen und der Dichthülse generierte Per- manentleckagemenge von Kraftstoff aufgenommen wird. Diese Permanentleckagemenge wird aus dem Leckageraum über eine Ablaufleitung in ein Niederdrucksystem beziehungsweise ein Rücklaufsystem abgeführt. Die Ablaufleitung ist bei diesem Kraftstoffinjektor in die Dichtfläche zwischen der Drosselplatte und dem das Aktormodul und das Ventil aufnehmenden Haltekörper in die Drossel- platte eingearbeitet. Such a fuel injector is known from DE 10 2007 040 115 Al. This fuel injector has the structure described above, wherein in the leakage chamber the generated between the centering pin and the sealing sleeve per- manentleckagemenge of fuel is added. This permanent leakage quantity is discharged from the leakage chamber via a drain line into a low-pressure system or a return system. In this fuel injector, the drain line is incorporated into the throttle plate in the sealing surface between the throttle plate and the holding body receiving the actuator module and the valve.
Aus der EP 1 288 486 A2 ist ein weiterer Kraftstoffinjektor bekannt, bei dem der Zwischenkörper als ein Hochdruckkörper ausgebildet ist. In diesen Hochdruckkörper ist zumindest ein ringförmiger Leckagekanal eingearbeitet, der den Durch- tritt des Hochdruckkanals durch den Hochdruckkörper umgibt. Dieser ringförmigeFrom EP 1 288 486 A2 a further fuel injector is known, in which the intermediate body is designed as a high-pressure body. In this high-pressure body, at least one annular leakage channel is incorporated, which surrounds the passage of the high-pressure passage through the high-pressure body. This annular
Leckagekanal ist so angeordnet, dass unter Berücksichtigung der sich ergeben- den Flächenpressungen eine zuverlässige Abdichtung der einander benachbarten Bauteile gegeben ist. Leakage channel is arranged so that taking into account the the surface pressures is given a reliable seal of the adjacent components.
Der Erfindung liegt die Aufgabe zu Grunde, einen Kraftstoffinjektor bereitzustel- len, bei denen die Leckageabführung aus dem Leckageraum ohne eine Beeinträchtigung der Dichtheit des Kraftstoffinjektors in den benachbarten Bereichen zu der Drosselplatte gewährleistet ist. The invention is based on the object to provide a fuel injector len, in which the leakage discharge from the leakage chamber is ensured without affecting the tightness of the fuel injector in the adjacent areas to the throttle plate.
Offenbarung der Erfindung Disclosure of the invention
Diese Aufgabe wird dadurch gelöst, dass in die Drosselplatte ein horizontaler Leckageablaufkanal eingelassen ist, der sich von dem zylinderförmigen Außenumfang der Drosselplatte bis zu einem Bereich unterhalb des Leckageraums erstreckt und der mit dem Leckageraum über einen Leckagekanal hydraulich ver- bunden ist. This object is achieved in that in the throttle plate, a horizontal leakage drainage channel is recessed, which extends from the cylindrical outer periphery of the throttle plate to an area below the leakage space and which is hydraulich connected to the leakage chamber via a leakage channel.
Vorteile der Erfindung Advantages of the invention
Durch die Einbringung des Leckageablaufkanals in die Drosselplatte ist die Dichtheit des Kraftstoffinjektors in den benachbarten Bereichen zu der Drosselplatte gegenüber bekannten Lösungen deutlich verbessert. Dabei ist in einer allgemeinsten Ausführung der Leckagekanal vorzugsweise vertikal direkt unter dem Leckageraum angeordnet und der abzuführende Kraftstoff wird von der Mündung des Leckageablaufkanals in den zylinderförmigen Außenumfang der Drosselplat- te in geeigneter Weise abgeführt. By introducing the leakage drain passage into the throttle plate, the tightness of the fuel injector in the adjacent areas to the throttle plate over known solutions is significantly improved. In a most general embodiment, the leakage channel is preferably arranged vertically directly below the leakage chamber, and the fuel to be discharged is discharged from the mouth of the leakage drainage channel into the cylindrical outer periphery of the throttle plate in a suitable manner.
In weiterer Ausgestaltung der Erfindung ist in die Drosselplatte ein benachbart zu deren Außenumfang angeordneter Leckageabführkanal eingelassen, der mit dem Leckageablaufkanal hydraulich verbunden ist. Dieser Leckageabführkanal ist ebenfalls vertikal angeordnet und mündet in weiterer Ausgestaltung in einenIn a further embodiment of the invention, an adjacent to the outer circumference arranged Leckageabführkanal is inserted into the throttle plate, which is hydraulich connected to the leakage drainage channel. This Leckageabführkanal is also arranged vertically and opens in a further embodiment in a
Ringraum, der zwischen der Drosselplatte und einem das Ventil aufnehmenden Ventilkörper angeordnet ist. Dabei kann der Ringraum in die Drosselplatte und/oder den Ventilkörper eingelassen sein. Der Ventilkörper kann als weiterer separater Zwischenkörper ausgebildet sein oder Bestandteil des Haltekörpers sein. Von dem Ringraum wird der Leckagekraftstoff über eine Ablaufleitung in einAnnular space disposed between the throttle plate and a valve body receiving the valve. In this case, the annular space can be embedded in the throttle plate and / or the valve body. The valve body may be formed as a further separate intermediate body or be part of the holding body. From the annulus of the leakage fuel via a drain line in a
Niederdrucksystem beziehungsweise Rücklauf System abgeführt. In weiterer Ausgestaltung der Erfindung ist der Leckageablaufkanal eine Leckageablaufbohrung, die wiederum in weiterer Ausgestaltung einen Durchmesser von zumindest angenähert 1,2 mm aufweist. Dieser Ausgestaltung liegt die Er- kenntnis zu Grunde, dass in dem Stirnflächenbereich der Drosselplatte unterhalb und oberhalb des Ablaufkanals unter Umständen die Zielwerte der erforderlichen Flächenpressung, die beispielsweise das anderthalbfache des Drucks eines den Kraftstoffinjektor mit Kraftstoff versorgenden Rails betragen, nicht erreicht werden. Eine Druckunterwanderung der Dichtfläche in diesen gegenüberliegenden Bereichen muss aber beim Injektorbetrieb ausgeschlossen werden. Durch dieLow pressure system or return system discharged. In a further embodiment of the invention, the leakage drainage channel is a leakage drainage bore, which in turn has a diameter of at least approximately 1.2 mm in a further embodiment. This refinement is based on the knowledge that the target values of the required surface pressure, which amount to one and a half times the pressure of a rail supplying the fuel injector with fuel, may not be reached in the end face region of the throttle plate below and above the discharge channel. However, a pressure infiltration of the sealing surface in these opposite areas must be excluded during injector operation. By the
Ausgestaltung als Leckageablaufbohrung mit dem angegebenen geringen Durchmesser ist aber die Flächenpressung nicht oder nur geringfügig negativ beeinflusst. Die Flächenpressung wird im Übrigen durch die mit dem Haltekörper verschraubte Spannmutter auf die zwischenliegenden Bauteile aufgebracht. Grundsätzlich wäre es denkbar, die Bohrung auch mit einem noch kleinerenDesign as a leakage drain hole with the specified small diameter but the surface pressure is not or only slightly negatively influenced. Incidentally, the surface pressure is applied to the intermediate components by the clamping nut bolted to the holding body. In principle, it would be conceivable to drill even with an even smaller one
Durchmesser zu fertigen. Dies ist aber wegen der Entgratprozesse des Leckagekanals und des Leckageabführkanals nicht sinnvoll, da dann die sichere Beseitigung der entgrateten Metallteile nicht gewährleistet wäre. In Weiterbildung der Erfindung ist in den Leckageablaufkanal oder die Leckageablaufbohrung eine sich zwischen dem Leckagekanal und dem Leckageabführkanal erstreckende Hülse eingesetzt. Durch diese Hülse wird der sich möglicherweise in der Drosselplatte ergebende lokale Steifigkeitsverlust kompensiert und die Werte für die lokalen Flächenpressungen an den entsprechenden Stirn- flächen werden weiter erhöht. Die Erstreckung der Hülse zwischen dem Leckagekanal und dem Leckageabführkanal garantiert, dass radial der gesamte abzudichtende Bereich eine ausreichend hohe Flächenpressung aufweist. Die Hülse kann aus dem gleichen Eisenwerkstoff wie die Drosselplatte hergestellt sein, es ist aber auch möglich die Hülse aus einem hochwertigeren, insbesondere feste- ren Eisenwerkstoff herzustellen. Die Hülse wird nach den Entgratvorgängen desDiameter to manufacture. However, this is not useful because of the deburring of the leakage channel and Leckageabführkanals, since then the safe removal of the deburred metal parts would not be guaranteed. In a further development of the invention, a sleeve extending between the leakage channel and the leakage discharge channel is inserted into the leakage drainage channel or the leakage drainage hole. This sleeve compensates for the local loss of stiffness possibly resulting in the throttle plate and further increases the values for the local surface pressures at the corresponding end faces. The extension of the sleeve between the leakage channel and the Leckageabführkanal ensures that radially the entire sealed area has a sufficiently high surface pressure. The sleeve may be made of the same ferrous material as the throttle plate, but it is also possible to produce the sleeve of a higher quality, especially solid ferrous material. The sleeve is after the deburring of the
Leckagekanals und des Leckageabführkanals in den Leckageablaufkanal einge- presst. Leakage channel and the Leckageabführkanals pressed into the leakage drainage channel.
In weiterer Ausgestaltung der Erfindung weist die Hülse einen Innendurchmesser von 0,6 mm auf. Dieser Durchmesser ist ausreichend, damit es zu keiner Drosselung der durchgeführten Leckmenge kommt. - A - In a further embodiment of the invention, the sleeve has an inner diameter of 0.6 mm. This diameter is sufficient so that there is no throttling of the leakage amount carried out. - A -
In Weiterbildung der Erfindung ist der Leckageablaufkanal beziehungsweise die Leckageablaufbohrung auf der der Hochdruckkanal gegenüberliegenden Seite der Drosselplatte angeordnet. Diese Seite bietet sich an, da in diesem Bereich die Drosselplatte frei von weiteren Durchbrüchen ist. In a development of the invention, the leakage drainage channel or the leakage drainage bore is arranged on the side of the throttle plate opposite the high-pressure channel. This site makes sense because in this area, the throttle plate is free of further breakthroughs.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel näher beschrieben ist. Further advantageous embodiments of the invention are described in the drawings, in which an embodiment shown in the figures is described in more detail.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Es zeigen: Figur 1 einen steuerventilseitigen Abschnitt eines Kraftstoffinjektors für ein 1 shows a control valve-side section of a fuel injector for a
Common-Rail-System einer Dieseleinspritzung im Schnitt,  Common rail system of a diesel injection on average,
Figur 2 eine perspektivische Ansicht der Drosselplatte, Figur 3 eine Seitenansicht der Drosselplatte mit allen Kanälen in der Drosselplatte und einer Ablaufbohrung ohne eingesetzte Hülse und Figure 2 is a perspective view of the throttle plate, Figure 3 is a side view of the throttle plate with all channels in the throttle plate and a drain hole without inserted sleeve and
Figur 4 eine Seitenansicht der Drosselplatte mit allen Kanälen in der Drosselplatte und mit einer in die Ablaufbohrung eingesetzten Hülse. Figure 4 is a side view of the throttle plate with all channels in the throttle plate and with a sleeve inserted into the drain hole.
Ausführungesformen der Erfindung Embodiments of the invention
Figur 1 zeigt einen steuerventilseitigen Abschnitt eines Kraftstoffinjektors für ein Common-Rail-System einer Dieseleinspritzung. In einem Haltekörper 1 ist ein elektrisch betätigtes Aktormodul 2 eingesetzt, das von einem elektronischen Motorsteuergerät entsprechend den Bedieneranforderungen betätigt wird. Das Aktormodul 2 ist bevorzugt ein Piezo-Aktor, der sich in der Darstellung in einem nicht geschalteten Zustand befindet. Mit einer Betätigungsnase 3 wirkt das Aktormodul 2 mit einem Ventilbolzen 4 zusammen, der in einer Dichthülse 5 gegen die Kraft einer Ventilfeder 6 längsbe- wegbar angeordnet ist. Der Ventilbolzen 4 weist eine Dichtfläche 7 auf, die im geschlossenen Zustand des Ventils mit einer in einer Ventilplatte 9 eingearbeiteten Sitzfläche 8 dichtend zusammenwirkt. In der Ventilplatte 9 ist unterhalb der Sitzfläche 8 ein Ventilraum 10 gebildet, der die in der Ventilplatte 9 fest einge- setzte Dichthülse 5 teilweise umgebend bis zu einem drosselplattenseitigen Ende der Ventilplatte 9 reicht. Figure 1 shows a control valve side portion of a fuel injector for a common rail system of a diesel injection. In a holding body 1, an electrically actuated actuator module 2 is used, which is actuated by an electronic engine control unit according to the operator requirements. The actuator module 2 is preferably a piezoactuator, which is in the representation in a non-switched state. With an actuating nose 3, the actuator module 2 cooperates with a valve pin 4, which in a sealing sleeve 5 against the force of a valve spring 6 längsbe- is arranged wegbar. The valve pin 4 has a sealing surface 7 which, in the closed state of the valve, cooperates sealingly with a seat surface 8 incorporated in a valve plate 9. In the valve plate 9, a valve space 10 is formed below the seat surface 8, which extends partially surrounding the sealing sleeve 5 inserted in the valve plate 9 as far as a throttle plate-side end of the valve plate 9.
In dem geschalteten Zustand des Aktormoduls 2 bewegt die Betätigungsnase 3 den Ventilbolzen 4 in Richtung zu der an die Ventilplatte 9 angrenzenden Dros- selplatte 11 und hebt die Dichtfläche 7 des Ventilbolzens 4 von der Sitzfläche 8 der Ventilplatte 9 ab, so dass eine Strömungsverbindung zwischen dem Ventilraum 10 und einem in dem Haltekörper 1 gebildeten Niederdruckraum, der Teil eines Rücklaufsystems für Kraftstoff ist, gebildet ist. An die Drosselplatte 11 schließt ein Düsenkörper 12 an, der mittels einerIn the switched state of the actuator module 2, the actuating lug 3 moves the valve pin 4 in the direction of the throttle plate 11 adjoining the valve plate 9 and lifts the sealing surface 7 of the valve pin 4 from the seat surface 8 of the valve plate 9, so that a flow connection between the Valve chamber 10 and formed in the holding body 1 low-pressure space, which is part of a return system for fuel is formed. To the throttle plate 11, a nozzle body 12 connects, by means of a
Spannmutter 13 unter Einschluss der Drosselplatte 11 und der Ventilplatte 9 mit dem Haltekörper 1 fest verspannt ist. In dem Düsenkörper 12 ist eine nicht näher dargestellte Düsennadel axial verschiebbar geführt, wobei von der Düsennadel lediglich ein Endbereich eines Düsennadelkolbens 14 sichtbar ist. Der Düsenna- delkolben 14 begrenzt einem Steuerraum 17, der auf der dem DüsennadelkolbenClamping nut 13 with the inclusion of the throttle plate 11 and the valve plate 9 with the holding body 1 is firmly clamped. In the nozzle body 12, a nozzle needle not shown is guided axially displaceable, wherein only one end portion of a nozzle needle piston 14 is visible from the nozzle needle. The nozzle needle piston 14 delimits a control chamber 17 which is located on the nozzle needle piston
14 gegenüberliegenden Seite von der Drosselplatte 11 begrenzt wird. In diesen Steuerraum 17 mündet ein Zulaufkanal 18 (Figur 2) mit einer darin angeordneten Zulaufdrossel sowie ein Ablaufkanal 19 (Figur 2) mit einer darin angeordneten Ablaufdrossel. Der Zulaufkanal 18 ist mit einer Hochdruckleitung 15, über die Kraftstoff, insbesondere Dieselkraftstoff, durch einen Hochdruckkanal 16 in der14 opposite side of the throttle plate 11 is limited. In this control chamber 17 opens an inlet channel 18 (Figure 2) with an inlet throttle arranged therein and a drain channel 19 (Figure 2) with an outlet throttle arranged therein. The inlet channel 18 is connected to a high-pressure line 15, via the fuel, in particular diesel fuel, through a high pressure passage 16 in the
Drosselplatte 11 einem nachfolgend noch erläuterten Düsennadeldruckraum zugeführt wird. Der Ablaufkanal 19 verbindet den Steuerraum 17 mit dem Ventilraum 10, so dass im Ruhezustand im Ventilraum 10, im Steuerraum 17 und im Düsennadeldruckraum der in der Hochdruckleitung 15 herrschende Kraftstoff- druck herrscht, beispielsweise 2000 bar. Throttle plate 11 is fed to a nozzle needle pressure chamber explained below. The drainage channel 19 connects the control chamber 17 with the valve chamber 10 so that in the idle state in the valve chamber 10, in the control chamber 17 and in the nozzle needle pressure chamber, the fuel pressure prevailing in the high-pressure line 15 prevails, for example 2000 bar.
Um Kraftstoff in den einem Kraftstoffinjektor zugeordneten Brennraum der Brennkraftmaschine einzuspritzen, muss die Düsennadel von einer geschlossenen Stellung in eine geöffnete Stellung verstellt werden. Dann gelangt der Kraft- stoff von dem Düsennadeldruckraum über Einspritzkanäle in dem Düsenkörper in den Brennraum. Zum Öffnen der Düsennadel muss der Düsennadelkolben 14 in Richtung auf die Drosselplatte 11 bewegt werden. In order to inject fuel into the combustion chamber of the internal combustion engine assigned to a fuel injector, the nozzle needle must be moved from a closed position to an open position. The fuel then passes from the nozzle needle pressure chamber via injection channels in the nozzle body the combustion chamber. To open the nozzle needle, the nozzle needle piston 14 must be moved in the direction of the throttle plate 11.
Um diese Bewegung zu bewirken, wird das Aktormodul 2 geschaltet. Die Dicht- fläche 7 des Ventilbolzens 4 wird von der Sitzfläche 8 abgehoben und der in demTo effect this movement, the actuator module 2 is switched. The sealing surface 7 of the valve pin 4 is lifted off the seat 8 and in the
Ventilraum 10 befindliche Kraftstoff kann in den Niederdruckraum abströmen, so dass der in dem Ventilraum 10 herrschende Kraftstoffdruck verringert wird. Durch den Ablaufkanal 19 strömt auch Kraftstoff aus dem Steuerraum 17 ab, so dass auch in dem Steuerraum 17 eine Druckreduzierung bewirkt wird, die die Bewe- gung des Düsennadelkolbens 14 in Richtung auf die Drosselplatte 11 auslöst. Valve space 10 located fuel can flow into the low pressure space, so that the pressure prevailing in the valve chamber 10 fuel pressure is reduced. Fuel also flows out of the control chamber 17 through the outlet channel 19, so that a pressure reduction is also effected in the control chamber 17 which triggers the movement of the nozzle needle piston 14 in the direction of the throttle plate 11.
Wird das Aktormodul 2 wieder stromlos geschaltet, wird die Dichtfläche 7 wieder auf die Sitzfläche 8 bewegt und über den durch den Zulaufkanal 18 If the actuator module 2 is de-energized, the sealing surface 7 is again moved to the seat surface 8 and over the through the inlet channel 18th
nachströmenden Kraftstoff wird der Kraftstoffdruck in dem Steuerraum 17 und auch dem Ventilraum 10 wieder auf einen solchen Druck erhöht, der ausreicht, den Düsennadelkolben 14 und damit die Düsennadel in die geschlossene Position zu verstellen. nachströmenden fuel, the fuel pressure in the control chamber 17 and the valve chamber 10 is again increased to such a pressure sufficient to adjust the nozzle needle piston 14 and thus the nozzle needle in the closed position.
Um die zwischen dem Ventilbolzen 4 und der Dichthülse 5 in einen Leckageraum 21 unterhalb des Ventilbolzens 4 generierte Permanentleckagemenge von Kraftstoff abzuführen, ist ein horizontaler Leckageablaufkanal 20 in die Drosselplatte 11 eingearbeitet, der mit dem Leckageraum 21 über einen vertikalen Leckagekanal 22 verbunden ist. Von dem Leckageablaufkanal 20 wird der Leckagekraftstoff über einen Leckageabführkanal 23 in einen Ringraum 24a, der in die Ventilplatte 9 eingearbeitet ist und der mit dem Niederdrucksystem verbunden ist, abgeführt.To dissipate the generated between the valve pin 4 and the sealing sleeve 5 in a leakage chamber 21 below the valve pin 4 permanent leakage amount of fuel, a horizontal leakage drainage channel 20 is incorporated into the throttle plate 11 which is connected to the leakage space 21 via a vertical leakage channel 22. From the leakage drainage passage 20, the leakage fuel is discharged via a leakage discharge passage 23 into an annular space 24a, which is incorporated in the valve plate 9 and which is connected to the low-pressure system.
In die Drosselplatte 11 ist gegenüberliegend zu dem Ringraum 24a ein weiterer Ringraum 24b eingearbeitet. In the throttle plate 11 opposite to the annular space 24a, a further annular space 24b is incorporated.
Figur 2 zeigt in perspektivischer Darstellung die Drosselplatte 11 mit dem Lecka- geablaufkanal 20 mit den einmündenden Leckagekanal 22 und Leckageabführkanal 23. Auf der gegenüberliegenden Seite ist der Hochdruckkanal 16 angeordnet, während in etwa rechtwinklig zu einer gedachten Verbindungslinie zwischen dem Leckagablaufkanal 20 und dem Hochdruckkanal 16 zwei Stiftbohrungen 26a, 26b außermittig zu der Mitte der Drossselplatte 11 angeordnet sind. In diese Stiftbohrungen 26a, 26b werden Fixierstifte eingesetzt, die in entsprechendeFIG. 2 shows a perspective illustration of the throttle plate 11 with the leakage drainage channel 20 with the opening leakage channel 22 and leakage discharge channel 23. On the opposite side, the high-pressure channel 16 is arranged, while approximately at right angles to an imaginary connecting line between the leakage outlet channel 20 and the high-pressure channel 16 two pin holes 26a, 26b are arranged eccentrically to the center of the throttle plate 11. In this pin holes 26 a, 26 b fixing pins are used, which in corresponding
Bohrungen in dem Düsenkörper 12 und durchdringend die Ventilplatte 9 in dem Haltekörper 1 eingreifen. Dadurch ist eine lagesichere und verdrehsichere Montage des Kraftstoffinjektors gewährleistet. Neben dem Zulaufkanal 18 und dem Ablaufkanal 19 ist noch ein Füllkanal 27 mit einer Fülldrossel in die Drosselplatte 11 eingearbeitet. Alle diese Kanäle sind als Bohrungen ausgebildet, wobei die jeweils zugehörigen Drosseln als separate Bauteile in die Bohrungen eingesetzt sein können oder aber durch entsprechende Bohrtechniken zusammen mit den Bohrungen gefertigt werden können. Die schraffierten Flächen unterhalb und oberhalb des Leckageablaufkanals 20 stellen die Bereiche dar, in denen durchh die erfindungsgemäße Ausgestaltung des Leckageablaufkanals 20 die Flächen- pressung an der Drosselplattenunterseite und der Drosselplattenoberseite die vorgegebenen Zielwerte erreicht. Holes in the nozzle body 12 and penetrating the valve plate 9 in the Engage holding body 1. As a result, a position-safe and torsion-proof mounting of the fuel injector is ensured. In addition to the inlet channel 18 and the outlet channel 19 is still a filling channel 27 incorporated with a Fülldrossel in the throttle plate 11. All of these channels are formed as holes, with the respective associated chokes can be used as separate components in the holes or can be made by appropriate drilling techniques together with the holes. The shaded areas below and above the leakage drainage channel 20 represent the areas in which the inventive design of the leakage drainage channel 20 reaches the surface pressure at the lower side of the throttle plate and the upper side of the throttle plate reaches the predetermined target values.
Figur 3 zeigt in eine Seitenansicht der Drosselplatte 11 mit allem Kanälen/oder Bohrungen in der Drosselplatte 11. Der Leckageablaufkanal 20 ist in dieser Figur hülsenlos ausgebildet, während in der entsprechenden Figur 4 in den Leckageablaufkanal 1 eine Hülse 25 eingesetzt ist. Die Hülse 25 weist einen Innendurchmesser von etwa 0,6 mm auf und erstreckt sich zwichen dem Leckagekanal 22 und dem Leckageabführkanal 23. Figure 3 shows a side view of the throttle plate 11 with all channels / or holes in the throttle plate 11. The leakage drain passage 20 is formed in this figure caseless, while in the corresponding figure 4 in the leakage drain passage 1, a sleeve 25 is inserted. The sleeve 25 has an inner diameter of about 0.6 mm and extends between the leakage channel 22 and the Leckageabführkanal 23rd

Claims

Ansprüche claims
1. Kraftstoffinjektor mit einem in einem Haltekörper (1) angeordneten Aktormodul (2), wobei der Haltekörper (1) mit einem Düsenkörper (12) unter Zwischenschaltung zumindest eines als Drosselplatte (11) ausgebildeten1. Fuel injector with a in a holding body (1) arranged actuator module (2), wherein the holding body (1) with a nozzle body (12) with the interposition of at least one throttle plate (11) formed
Zwischenkörpers verspannt ist, wobei die Drosselplatte (11) von zumindest einem Hochdruckkanal (16) sowie einem Ablaufkanal (19) mit einer Ablaufdrossel durchdrungen ist und wobei zwischen dem Aktormodul (2) und der Drosslplatte (11) ein von dem Aktormodul (2) betätigtes Ventil, aufweisend zumindest einen Ventilbolzen (4) und eine Dichthülse (5), unter Bildung eines der Drosselplatte (11) zugewandten Leckageraums (21) angeordnet ist, The intermediate body is clamped, wherein the throttle plate (11) of at least one high-pressure channel (16) and a drain passage (19) is penetrated with an outlet throttle and between the actuator module (2) and the Drossellplatte (11) actuated by the actuator module (2) Valve, comprising at least one valve pin (4) and a sealing sleeve (5), to form a throttle plate (11) facing the leakage chamber (21) is arranged,
dadurch gekennzeichnet,  characterized,
dass in die Drosselplatte (11) ein horizontaler Leckageablaufkanal (20) eingelassen ist, der sich von dem zylinderförmigen Außenumfang der that in the throttle plate (11) a horizontal leakage drainage channel (20) is inserted, which extends from the cylindrical outer periphery of the
Drosselplatte (11) bis zu einem Bereich unterhalb des Lekageraums (21) erstreckt und der mit dem Lekageraum (21) über einen Leckagekanal (22) hydraulich verbunden ist. Throttle plate (11) extends to an area below the Lekageraums (21) and which is hydraulically connected to the Lekageraum (21) via a leakage channel (22).
2. Kraftstoffinjektor nach Anspruch 1, 2. Fuel injector according to claim 1,
dadurch gekennzeichnet, dass in die Drosselplatte (11) ein benachbart zu deren Außenumfang angeordneter Leckageabführkanal (23) eingelassen ist, der mit dem Leckageablaufkanal (20) hydraulich verbunden ist.  characterized in that in the throttle plate (11) adjacent to the outer circumference arranged Leckageabführkanal (23) is recessed, which is hydraulich connected to the leakage drainage channel (20).
3. Kraftstoffinjektor nach Anspruch 2, 3. Fuel injector according to claim 2,
dadurch gekennzeichnet, dass der Leckageabführkanal (23) in einen mit einer Leckageabführung verschalteten Ringraum (24) einmündet.  characterized in that the Leckageabführkanal (23) opens into an interconnected with a leakage discharge annulus (24).
4. Kraftstoffinjektor nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Leckageablaufkanal (20) eine Ablaufbohrung ist. 4. Fuel injector according to one of the preceding claims, characterized in that the leakage drainage passage (20) is a drain hole.
5. Kraftstoffinjektor nach einem der vorherigen Ansprüche, 5. Fuel injector according to one of the preceding claims,
dadurch gekennzeichnet, dass der Leckageablaufkanal (20) einen characterized in that the leakage drainage channel (20) has a
Durchmesser von etwa 1,2 mm aufweist. Diameter of about 1.2 mm.
6. Kraftstoffinjektor nach einem der vorherigen Ansprüche, 6. Fuel injector according to one of the preceding claims,
dadurch gekennzeichnet, dass in den Leckageablaufkanal (20) eine sich zwischen den Leckagekanal (22) und dem Leckageabführkanal (23) erstreckende Hülse (25) eingesetzt ist.  characterized in that in the leakage drainage channel (20) between the leakage channel (22) and the Leckageabführkanal (23) extending sleeve (25) is inserted.
7. Kraftstoffinjektor nach Anspruch 6, 7. Fuel injector according to claim 6,
dadurch gekennzeichnet, dass die Hülse (25) einen Innendurchmesser von etwa 0,6 mm aufweist.  characterized in that the sleeve (25) has an inner diameter of about 0.6 mm.
8. Kraftstoffinjektor nach einem der vorherigen Ansprüche, 8. Fuel injector according to one of the preceding claims,
dadurch gekennzeichnet, dass der Leckageablaufkanal (20) auf der dem Hochdruckkanal (16) gegenüberliegenden Seite der Drosselplatte (11) angeordnet ist.  characterized in that the leakage drainage passage (20) is disposed on the high pressure passage (16) opposite side of the throttle plate (11).
EP10735254.4A 2009-08-28 2010-07-19 Fuel injector for an internal combustion engine Active EP2470776B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009028979A DE102009028979A1 (en) 2009-08-28 2009-08-28 Fuel injector for an internal combustion engine
PCT/EP2010/060411 WO2011023466A1 (en) 2009-08-28 2010-07-19 Fuel injector for an internal combustion engine

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EP2470776A1 true EP2470776A1 (en) 2012-07-04
EP2470776B1 EP2470776B1 (en) 2015-09-09

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EP (1) EP2470776B1 (en)
CN (1) CN102483018B (en)
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US9133805B2 (en) 2015-09-15
CN102483018A (en) 2012-05-30
EP2470776B1 (en) 2015-09-09
WO2011023466A1 (en) 2011-03-03
US20120138019A1 (en) 2012-06-07
CN102483018B (en) 2015-06-17
DE102009028979A1 (en) 2011-03-03

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