WO2008040588A1 - Fuel injector having a restrictor plate and a solenoid valve - Google Patents

Fuel injector having a restrictor plate and a solenoid valve Download PDF

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Publication number
WO2008040588A1
WO2008040588A1 PCT/EP2007/058105 EP2007058105W WO2008040588A1 WO 2008040588 A1 WO2008040588 A1 WO 2008040588A1 EP 2007058105 W EP2007058105 W EP 2007058105W WO 2008040588 A1 WO2008040588 A1 WO 2008040588A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
fuel injector
throttle plate
pressure pin
solenoid valve
Prior art date
Application number
PCT/EP2007/058105
Other languages
German (de)
French (fr)
Inventor
Matthias Schnell
Friedrich Howey
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
Priority to AT07802499T priority Critical patent/ATE449251T1/en
Priority to EP07802499A priority patent/EP2078157B1/en
Priority to DE502007002086T priority patent/DE502007002086D1/en
Priority to CN2007800373132A priority patent/CN101523043B/en
Publication of WO2008040588A1 publication Critical patent/WO2008040588A1/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
    • 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
    • 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
    • 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
    • F02M63/0031—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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • An injector for injecting fuel in a combustion chamber of an internal combustion engine in which an injection valve member is actuated via a solenoid-operated control valve is known, for example, from EP-A 1 612 403.
  • a flow restrictor from a control room in the fuel return can be closed or released.
  • the control chamber is bounded on one side by a control piston, with which an injection valve is actuated, which releases or closes at least one injection opening in the combustion chamber of the internal combustion engine.
  • the outlet throttle is received in a body, which is provided on the side facing away from the control chamber with a tapered valve seat. In this valve seat, a closing element is adjustable, which is connected to the armature of the solenoid valve.
  • an edge is formed on the closing element, which is provided against the conically shaped seat.
  • the closing element moves on an axial rod, which is integrally connected to the body in which the drainage throttle is formed.
  • a solenoid valve In fuel injectors, which are used in high-pressure accumulator injection systems (common rail), a solenoid valve is attractive as an actuator for actuating the fuel injector for cost and space reasons.
  • the solenoid valve can be made pressure balanced. The pressure balance is achieved in that a guide diameter and the seat diameter of the solenoid valve are identical, so that in the closed state of the solenoid valve ideally no pressure forces act on the example designed as a valve needle valve member.
  • a high-pressure inlet which extends from one, a pressurized with system pressure control chamber discharge throttle to the seat of the solenoid valve, not designed by holes, but by a pressure plate aligned with a throttle plate and a bore in the throttle plate.
  • a pressure pin is designed in its lower region in a smaller diameter and has in this smaller diameter area at least one recess in the form of a flattening, a groove or a bevel or the like.
  • a bore for receiving the pressure pin made in its lower portion in a small diameter is made with a slightly larger diameter. Due to the adjusting game between the smaller diameter in the lower region of the pressure pin and the bore in the throttle plate in a slightly larger diameter, the pressure pin is directed within the available game relative to the throttle plate.
  • the high pressure is performed by the formed in the region of the smaller diameter of the pressure pin, at least one recess to the valve seat.
  • the bore in the throttle plate can be formed with a slightly smaller diameter than the area of the pressure pin which is pressed into this bore.
  • the preferably needle-shaped valve member and the pressure pin can be paired with respect to their diameter prior to assembly of the pressure pin in the throttle plate to produce the guide game.
  • only the pressure pin machined in the lower area can be fitted into the throttle plate.
  • the throttle plate comprising a base plate and the fitted guide pin, can be finished by way of a grinding process.
  • the valve seat and the guide of the needle-shaped valve member can be made in one operation, resulting in a highly accurate design of valve member, valve seat and valve member guide.
  • the pressure pin is movably received in the plate, this can be pushed upwards by the pressure prevailing behind the outlet throttle, which is to be avoided in individual cases. Therefore, the pressure pin is preferably pressed into the throttle plate.
  • the pressing of the pressure pin in the throttle plate also has the advantage that a pressed into the throttle plate thrust pin can be conveniently processed in one operation, when the consisting of throttle plate and in this pressed-in pressure pins assembly is, for example, honed.
  • FIG. 1 shows an embodiment in which an armature of a solenoid valve is accommodated on an armature guide and a high pressure discharge is formed as a bore in the Anker Installation
  • FIG. 2 shows a variant of the high-pressure drain of the control chamber proposed according to the invention with a pressure pin received in a throttle plate and
  • FIG. 2 shows a variant of the high-pressure drain of the control chamber proposed according to the invention with a pressure pin received in a throttle plate and
  • Figure 3 is an illustration of a preassembled assembly of a pressure pin and a throttle plate.
  • Figure 1 shows a sleeve-shaped anchor, which is slidably received on an armature guide in which a high pressure discharge is designed as a bore.
  • a fuel injector 10 which is only partially illustrated in FIG. 1, comprises a solenoid valve 12 whose armature assembly is designated by reference numeral 14.
  • the armature assembly 14 includes an armature guide 16 in which a high pressure drain formed as a bore extends.
  • an anchor bolt 18 is slidably guided, on which an anchor plate 20 is formed in the upper region.
  • the armature guide 16 of the armature assembly 14 as shown in Figure 1 is located above a valve member 22.
  • a control chamber 24 is formed, which is acted upon by an inlet throttle 28 under standing at system pressure fuel.
  • the valve piece 22 as shown in Figure 1 also includes a guide portion for a push rod or an injection valve member 30, which are only indicated in Figure 1.
  • an outlet throttle 26 is formed, which is aligned with the bore in the armature guide 16, which is the high pressure drain.
  • FIG. 2 shows that in the injector body of the fuel injector 10 there is a high-pressure inlet 42, via which a control chamber 24 is acted upon by fuel under system pressure.
  • the high pressure inlet 42 extends in part through a throttle plate 44 within which a high pressure drain 52 extends.
  • the solenoid valve 12 as shown in Figure 2 includes a pressure pin 64, which may for example be loosely received in the injector body of the fuel injector 10 and to which an anchor sleeve 50 is slidably received.
  • the anchor plate 50 At the anchor plate 50 is the anchor plate 20 which is attracted by a solenoid 48 of the solenoid valve 12.
  • the armature sleeve 50 of the solenoid valve 12 shown in Figure 2 is acted upon by a valve spring 46 which is supported on the injector body of the fuel injector 10 shown in Figure 2.
  • FIG. 3 From the sectional view of Figure 3 shows that the solenoid valve 12 shown there has the pressure pin 64, on the circumference at least one recess is formed.
  • the pressure pin 64 shown in Figure 3 with at least one recess is in the throttle plate 44 arranged eccentrically to the injector axis designated by reference numeral 62.
  • a valve space of the solenoid valve 12 is designated by reference numeral 60.
  • the pressure pin 64 shown in Figure 3, for example, in the high-pressure outlet 52 of the throttle plate 44 may be received by means of a press fit 66.
  • the pressure pin 64 with at least one recess on the circumference is formed in a first diameter 74 and in a second diameter 76.
  • the pressure pin 64 shown in FIG. 3 with at least one recess is received in the region of the first diameter 74, which is selected to be smaller than the second diameter 76, within the high-pressure outlet 52 of the throttle plate 44.
  • the pressure pin 64 having at least one recess may alternatively be accommodated for attachment by means of a press fit 66 with guide play in the high pressure drain 52 of the throttle plate 44 and - as shown in Figure 2 - supported on the injector of the fuel injector 10.
  • the at least one formed on the circumference of the pressure pin 64 recess may - as shown in Figure 2 - be formed for example as a flattening 72 in the region of the pressure pin 64, in which it has a first diameter 74 which is selected to be smaller than the second diameter 76 of Pressure pin 64.
  • the anchor sleeve 50 is guided on the pressure pin 64.
  • the anchor sleeve 50 forms with its throttle plate 44 assigning end face a valve seat 68 with a seat lift 70 on the upper end side of the throttle plate 44.
  • the armature sleeve 50 of the solenoid valve 12 is - as shown in Figure 2 - biased by the valve spring 46 which is received within a magnetic core of the solenoid valve 12 which surrounds the solenoid 48 of the solenoid valve 12.
  • control chamber 24 Adjacent to the throttle plate 44 of the fuel injector 10 shown in section in FIG. 2 is the control chamber 24, which is delimited by a control chamber sleeve 82.
  • the control chamber sleeve 82 may for example be received on the push rod 30 or the injection valve member 30 and acted upon by a spring 84, so that the control chamber sleeve 82 is employed at the lower end side of the throttle plate 44.
  • the control chamber 24 is acted upon by a high-pressure inlet 42 which extends through the injector body of the fuel injector 10 and the throttle plate 44 with the interposition of an inlet throttle, not shown in Figure 2, with system pressure.
  • the control quantity diverted from the control chamber 24 when the seat 68 is open flows, via a drain 80, for example, into a low-pressure region 78 of the fuel injector shown in section in FIG. 2, and from there back into the tank of a motor vehicle via a low-pressure line.
  • a drain 80 for example, into a low-pressure region 78 of the fuel injector shown in section in FIG. 2, and from there back into the tank of a motor vehicle via a low-pressure line.
  • the armature plate 20 which is received on the armature sleeve 50, is attracted.
  • the armature sleeve 50 lifts off from the seat elevation 70, which, for example, can be designed conically on the upper end face of the throttle plate 44.
  • valve seat 68 may also be designed as a flat seat, which is arranged, for example, on the upper side of the throttle plate 44.
  • the pressure rod 30 or the preferably needle-shaped injection valve member 30 is driven open immediately, so that injection openings formed at the combustion chamber end - not shown here - of the fuel injector 10 are released and fuel is injected into the combustion chamber of the internal combustion engine.
  • the armature sleeve 50 which is slidably guided on the pressure pin 64 with at least one recess in the region of the second diameter 76, is pushed back into the valve seat 68 by the valve spring 46.
  • the pressure relief of the control chamber 24 is thus canceled and the pressure in the control chamber 24 increases again. Due to the pressure increase in the control chamber 24, the push rod 30 and the preferably needle-shaped injection valve member 30 is placed back in its seat, so that injection ports on the combustion chamber side end of the fuel injector 10 are closed again and the injection is terminated.
  • the pressure pin 64 with its area recorded in the high-pressure drain 52 is formed in the first diameter 74.
  • this area is the at least one recess that can be performed as a flattening 72 as a bevel, as a groove or the like.
  • the at least one flat 72 on the circumference of the pressure pin 64 leads the high pressure to the valve seat 68 of the solenoid valve 12 in the embodiment variant shown in FIG.
  • a high pressure drain 52 performing bore in the throttle plate 44 can be made in a slightly larger diameter, so that the pressure pin 64 aligns with at least one formed on the circumference of the flattening 72 within the guide game on the throttle plate 44.
  • the pressure pin 64 can be fixed with its formed in the first diameter 74 area with a press fit 66 in the throttle plate 44, so that the high-pressure flow cross section through the at least one Flattening 72 is limited to the circumference of the pressure pin 64. From the illustration according to FIG. 3, a preassembled assembly of throttle plate and thrust pin can be seen.
  • the pressure pin 64 Before mounting the pressure pin 64 in the throttle plate 44, the pressure pin 64 is paired with respect to the guide clearance to the inner diameter of the anchor sleeve 50 with this. Thus, a guide play between the second diameter 76 of the pressure pin 64 and the anchor sleeve 50 is made. The only in the lower area, d. H. In the region in which the first diameter 74 is formed, machined pressure pin 64 can now be pressed into the throttle plate 44, for example with a press fit 66.
  • the preassembled assembly of throttle plate 44 and thrust pin 64 can now be edited as a preassembled assembly via a high-precision grinding process, so that in a high surface quality produced surfaces 86 in the region of the seat elevation 70 on the throttle plate 44 and in the region formed in the second diameter 76 section of the pressure pin 64 generate.
  • Preference is given in one operation in the seat elevation 70 and the guide portion of the anchor sleeve 50, d. H. in the portion of the pressure pin 64 in which it is formed in the second diameter 76, highly accurately machined surfaces 86 generated.

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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)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention relates to a fuel injector (10) having a solenoid valve (12). A control space (24) which is loaded with a system pressure via a high-pressure feed line (42) can be relieved of pressure via the solenoid valve (12). The control space (24) comprises a high-pressure outlet (52), in which an outlet restrictor (26) is contained and which opens at a valve seat (68) of the solenoid valve (12). A pressure pin (64) is accommodated in the high-pressure outlet (52) in a restrictor plate (44).

Description

Beschreibung description
Titeltitle
KRAFTSTOFFINJEKTOR MIT EINER DROSSELPLATTE UND EINEM MAGNETVENTILFUEL INJECTOR WITH A THROTTLE PLATE AND A SOLENOID VALVE
Stand der TechnikState of the art
Ein Injektor zum Einspritzen von Kraftstoff in einem Brennraum einer Verbrennungskraftmaschine, bei welchem ein Einspritzventilglied über ein magnetbetriebenes Steuerventil angesteuert wird, ist zum Beispiel aus EP-A 1 612 403 bekannt. Mit Hilfe des Steuerventils ist eine Ablaufdrossel aus einem Steuerraum in den Kraftstoffrücklauf verschließbar oder freigebbar. Der Steuerraum wird an einer Seite durch einen Steuerkolben begrenzt, mit welchem ein Einspritzventil angesteuert wird, welches mindestens eine Einspritzöffhung in dem Brennraum der Verbrennungskraftmaschine freigibt oder schließt. Die Ablaufdrossel ist in einem Körper aufgenommen, welcher auf der dem Steuerraum abgewandten Seite mit einem sich verjüngenden Ventilsitz versehen ist. In diesem Ventilsitz ist ein Schließelement stellbar, welches mit dem Anker des Magnetventils verbunden ist. Hierzu ist am Schließelement eine Kante ausgebildet, welche gegen den konisch ausgeformten Sitz gestellt wird. Das Schließelement bewegt sich auf einer axialen Stange, welche mit dem Körper, in dem die Ablaufdrossel ausgebildet, einstückig verbunden ist. Damit das Ventil flüssigkeitsdicht schließt, ist es notwendig, hochpräzise Oberflächen herzustellen, und eine hochgenaue Passung des Schließelementes auf der axialen Stange vorzusehen, um zu vermeiden, dass das Schließelement taumelt und hierdurch verkanten kann, wodurch der Sitz nicht vollständig geschlossen wird.An injector for injecting fuel in a combustion chamber of an internal combustion engine in which an injection valve member is actuated via a solenoid-operated control valve is known, for example, from EP-A 1 612 403. With the help of the control valve, a flow restrictor from a control room in the fuel return can be closed or released. The control chamber is bounded on one side by a control piston, with which an injection valve is actuated, which releases or closes at least one injection opening in the combustion chamber of the internal combustion engine. The outlet throttle is received in a body, which is provided on the side facing away from the control chamber with a tapered valve seat. In this valve seat, a closing element is adjustable, which is connected to the armature of the solenoid valve. For this purpose, an edge is formed on the closing element, which is provided against the conically shaped seat. The closing element moves on an axial rod, which is integrally connected to the body in which the drainage throttle is formed. In order for the valve to close in a liquid-tight manner, it is necessary to produce high-precision surfaces and to provide a highly accurate fit of the closure member on the axial rod to prevent the closure member from tumbling and canting thereby not fully closing the seat.
Bei Kraftstoffinjektoren, die bei Hochdruckspeichereinspritzsystemen (Common Rail) eingesetzt werden, ist ein Magnetventil als Aktor zum Betätigen des Kraftstoffinjektors aus Kosten- und Bauraumgründen attraktiv. Um auch bei hohem Druck vom Systemdruck mit kleinen Magnetkräften zur Betätigung des Magnetventils auszukommen, kann das Magnetventil druckausgeglichen gestaltet werden. Die Druckausgeglichenheit wird dadurch er- reicht, dass ein Führungsdurchmesser und der Sitzdurchmesser des Magnetventils identisch sind, so dass im geschlossenen Zustand des Magnetventils im Idealfall keine Druckkräfte auf das zum Beispiel als Ventilnadel ausgebildete Ventilglied wirken. Bei druckausgeglichenen Magnetventilen existiert eine Bauform, bei der der Hochdruck auf der Innenseite ansteht, und das nadeiförmig ausgebildete Ventilglied bzw. ein Anker des Magnetventils als Hülse auf eine Ankerführung geführt werden. Dieses Konzept wird dann problematisch, wenn der Führungsdurchmesser und der Sitzdurchmesser klein ausgelegt werden soll. Dadurch ergibt sich das Problem, angesichts der durch die Bauteilfestigkeit gegebenen Randbedingungen, den Hochdruckzulauf, d. h. eine Verbindung zwischen einer einen Steuerraum entlastenden Ablaufdrossel und dem Ventilsitz druckfest auszubilden.In fuel injectors, which are used in high-pressure accumulator injection systems (common rail), a solenoid valve is attractive as an actuator for actuating the fuel injector for cost and space reasons. In order to make do with small magnetic forces for actuating the solenoid valve even at high pressure from the system pressure, the solenoid valve can be made pressure balanced. The pressure balance is achieved in that a guide diameter and the seat diameter of the solenoid valve are identical, so that in the closed state of the solenoid valve ideally no pressure forces act on the example designed as a valve needle valve member. In pressure-balanced solenoid valves exists a design in which the high pressure is present on the inside, and the needle-shaped valve member or an armature of the solenoid valve are guided as a sleeve on an armature guide. This concept is problematic when the guide diameter and the seat diameter to be designed small. This results in the problem, given the given by the component strength boundary conditions, the high-pressure inlet, ie a connection between a control chamber relieving drain throttle and the valve seat form pressure resistant.
Offenbarung der ErfindungDisclosure of the invention
Der erfindungsgemäß vorgeschlagenen Lösung folgend wird ein Hochdruckzulauf, der sich von einer, einen mit Systemdruck beaufschlagten Steuerraum entlastenden Ablaufdrossel zum Sitz des Magnetventiles erstreckt, nicht durch Bohrungen gestaltet, sondern durch einen zu einer Drosselplatte ausgerichteten Druckstift und einer Bohrung in der Drosselplatte. Durch die Ausrichtung des Druckstiftes unmittelbar an der Drosselplatte wird erreicht, dass das bevorzugt nadeiförmig ausgebildete Ventilglied des Magnetventiles zum in der Drosselplatte ausgebildeten Ventilsitz positioniert und ausgerichtet wird. Durch eine Druckführung von der Außenseite am unteren Teil des Druckstiftes werden die Festigkeitsprobleme umgangen, die sich beim Vorsehen von einer oder mehreren Innenbohrungen im Druckstift einstellen würden.Following the proposed solution according to the invention, a high-pressure inlet, which extends from one, a pressurized with system pressure control chamber discharge throttle to the seat of the solenoid valve, not designed by holes, but by a pressure plate aligned with a throttle plate and a bore in the throttle plate. By aligning the pressure pin directly on the throttle plate is achieved that the preferably needle-shaped valve member of the solenoid valve is positioned and aligned with the valve seat formed in the throttle plate. By a pressure guide from the outside at the lower part of the pressure pin, the strength problems are circumvented, which would occur in the provision of one or more inner holes in the pressure pin.
In einer ersten Ausführungsvariante der erfindungsgemäß vorgeschlagenen Lösung ist ein Druckstift in seinem unteren Bereich in einem kleineren Durchmesser ausgeführt und weist in diesem im kleineren Durchmesser ausgeführten Bereich mindestens eine Aussparung in Form einer Abflachung, einer Nut oder eines Anschliffes oder dergleichen auf. In der Drosselplatte wird eine Bohrung zur Aufnahme des in seinem unteren Bereich in einem kleinen Durchmesser hergestellten Druckstiftes mit einem etwas größeren Durchmesser hergestellt. Aufgrund des sich einstellenden Spiels zwischen dem kleineren Durchmesser im unteren Bereich des Druckstiftes und der Bohrung in der Drosselplatte in einem etwas größeren Durchmesser richtet sich der Druckstift innerhalb des zur Verfügung stehenden Spieles relativ zur Drosselplatte aus. Der Hochdruck wird durch die im Bereich des kleineren Durchmessers des Druckstiftes ausgebildete, mindestens eine Aussparung zum Ventilsitz geführt.In a first embodiment variant of the solution proposed according to the invention, a pressure pin is designed in its lower region in a smaller diameter and has in this smaller diameter area at least one recess in the form of a flattening, a groove or a bevel or the like. In the throttle plate, a bore for receiving the pressure pin made in its lower portion in a small diameter is made with a slightly larger diameter. Due to the adjusting game between the smaller diameter in the lower region of the pressure pin and the bore in the throttle plate in a slightly larger diameter, the pressure pin is directed within the available game relative to the throttle plate. The high pressure is performed by the formed in the region of the smaller diameter of the pressure pin, at least one recess to the valve seat.
Alternativ kann auch die Bohrung in der Drosselplatte mit einem etwas kleineren Durch- messer ausgebildet werden als der Bereich des Druckstiftes, der in diese Bohrung einge- presst wird. Einer weiteren Ausfuhrungsvariante des der Erfindung zugrunde liegenden Gedankens folgend, können das bevorzugt nadelförmig ausgebildete Ventilglied und der Druckstift vor der Montage des Druckstifts in die Drosselplatte hinsichtlich ihres Durchmessers gepaart werden, um das Führungsspiel herzustellen. Alternativ kann auch nur der im unteren Be- reich bearbeitete Druckstift in die Drosselplatte eingepasst werden. Anschließend lässt sich die Drosselplatte, eine Grundplatte und den eingepassten Führungsstift enthaltend, im Wege eines Schleifvorgangs fertig bearbeiten. Dabei können der Ventilsitz und die Führung des nadeiförmig ausgebildeten Ventilgliedes in einem Arbeitsgang hergestellt werden, was zu einer hochgenauen Ausbildung von Ventilglied, Ventilsitz und Ventilgliedführung führt.Alternatively, the bore in the throttle plate can be formed with a slightly smaller diameter than the area of the pressure pin which is pressed into this bore. According to a further embodiment variant of the concept underlying the invention, the preferably needle-shaped valve member and the pressure pin can be paired with respect to their diameter prior to assembly of the pressure pin in the throttle plate to produce the guide game. Alternatively, only the pressure pin machined in the lower area can be fitted into the throttle plate. Subsequently, the throttle plate, comprising a base plate and the fitted guide pin, can be finished by way of a grinding process. In this case, the valve seat and the guide of the needle-shaped valve member can be made in one operation, resulting in a highly accurate design of valve member, valve seat and valve member guide.
Wird der Druckstift in der Platte beweglich aufgenommen, kann dieser durch den hinter der Ablaufdrossel herrschenden Druck nach oben gedrückt werden, was in einzelnen Fällen zu vermeiden ist. Daher wird der Druckstift bevorzugt in die Drosselplatte eingepresst. Das Einpressen des Druckstiftes in die Drosselplatte hat ferner den Vorteil, dass ein in die Dros- selplatte eingepresster Druckstift in einem Arbeitsgang günstig bearbeitet werden kann, wenn die aus Drosselplatte und in diese eingepresste Druckstifte bestehende Baugruppe beispielsweise feingeschliffen wird.If the pressure pin is movably received in the plate, this can be pushed upwards by the pressure prevailing behind the outlet throttle, which is to be avoided in individual cases. Therefore, the pressure pin is preferably pressed into the throttle plate. The pressing of the pressure pin in the throttle plate also has the advantage that a pressed into the throttle plate thrust pin can be conveniently processed in one operation, when the consisting of throttle plate and in this pressed-in pressure pins assembly is, for example, honed.
Zeichnungendrawings
Anhand der Zeichnung wird die Erfindung nachstehend eingehender beschrieben.With reference to the drawing, the invention will be described below in more detail.
Es zeigt:It shows:
Figur 1 eine Ausführungsvariante, bei der ein Anker eines Magnetventiles auf einer Ankerführung aufgenommen ist und ein Hochdruckablauf als Bohrung in der An- kerführung ausgebildet ist,1 shows an embodiment in which an armature of a solenoid valve is accommodated on an armature guide and a high pressure discharge is formed as a bore in the Ankerführung,
Figur 2 eine Ausführungsvariante des erfindungsgemäß vorgeschlagenen Hochdruckab- laufes des Steuerraums mit in einer Drosselplatte aufgenommenem Druckstift undFIG. 2 shows a variant of the high-pressure drain of the control chamber proposed according to the invention with a pressure pin received in a throttle plate and FIG
Figur 3 eine Darstellung einer vormontierten Baugruppe eines Druckstiftes und einer Drosselplatte.Figure 3 is an illustration of a preassembled assembly of a pressure pin and a throttle plate.
Ausführungsvarianten Figur 1 zeigt einen hülsenförmig ausgebildeten Anker, der an einer Ankerführung verschieblich aufgenommen ist, in der ein Hochdruckablauf als Bohrung ausgebildet ist.variants Figure 1 shows a sleeve-shaped anchor, which is slidably received on an armature guide in which a high pressure discharge is designed as a bore.
Ein in Figur 1 nur teilweise dargestellter Kraftstoffinjektor 10 umfasst ein Magnetventil 12, dessen Ankerbaugruppe durch Bezugszeichen 14 bezeichnet ist. Die Ankerbaugruppe 14 umfasst eine Ankerführung 16, in der ein als Bohrung ausgebildeter Hochdruckablauf verläuft. In der Ankerführung 16 ist ein Ankerbolzen 18 verschiebbar geführt, an dem im oberen Bereich eine Ankerplatte 20 ausgebildet ist. Die Ankerführung 16 der Ankerbaugruppe 14 gemäß der Darstellung in Figur 1 befindet sich oberhalb eines Ventilstückes 22. Innerhalb des Ventilstückes 22 ist ein Steuerraum 24 ausgebildet, der über eine Zulaufdrossel 28 mit unter Systemdruck stehendem Kraftstoff beaufschlagt wird. Das Ventilstück 22 gemäß der Darstellung in Figur 1 umfasst darüber hinaus auch einen Führungsabschnitt für eine Druckstange oder ein Einspritzventilglied 30, die in Figur 1 nur angedeutet sind.A fuel injector 10, which is only partially illustrated in FIG. 1, comprises a solenoid valve 12 whose armature assembly is designated by reference numeral 14. The armature assembly 14 includes an armature guide 16 in which a high pressure drain formed as a bore extends. In the armature guide 16, an anchor bolt 18 is slidably guided, on which an anchor plate 20 is formed in the upper region. The armature guide 16 of the armature assembly 14 as shown in Figure 1 is located above a valve member 22. Within the valve member 22, a control chamber 24 is formed, which is acted upon by an inlet throttle 28 under standing at system pressure fuel. The valve piece 22 as shown in Figure 1 also includes a guide portion for a push rod or an injection valve member 30, which are only indicated in Figure 1.
Innerhalb des Ventilstückes 22 ist eine Ablaufdrossel 26 ausgebildet, die mit der Bohrung in der Ankerführung 16, die den Hochdruckablauf darstellt, fluchtet. Bei Betätigung des in Figur 1 hülsenförmig dargestellten Ankerbolzens 18 wird ein Sitz an der Ankerführung 16 freigegeben, so dass eine Steuermenge aus dem Steuerraum 24 über die Ablaufdrossel 26 in den Niederdruckbereich des in Figur 1 nur teilweise dargestellten Kraftstoffinjektors 10 zu strömen vermag.Within the valve piece 22, an outlet throttle 26 is formed, which is aligned with the bore in the armature guide 16, which is the high pressure drain. Upon actuation of the sleeve bolt 18 shown in sleeve form in FIG. 1, a seat on the armature guide 16 is released so that a control quantity from the control chamber 24 via the outlet throttle 26 is able to flow into the low-pressure region of the fuel injector 10 shown only partially in FIG.
Aus der Darstellung gemäß Figur 2 geht hervor, dass im Injektorkörper des Kraftstoffinjektors 10 ein Hochdruckzulauf 42 verläuft, über welchen ein Steuerraum 24 mit unter Sys- temdruck stehendem Kraftstoff beaufschlagt wird. Der Hochdruckzulauf 42 verläuft zum Teil durch eine Drosselplatte 44, innerhalb der sich ein Hochdruckablauf 52 erstreckt. Das Magnetventil 12 gemäß der Darstellung in Figur 2 umfasst einen Druckstift 64, der zum Beispiel lose im Injektorkörper des Kraftstoffinjektors 10 aufgenommen sein kann und an dem eine Ankerhülse 50 verschiebbar aufgenommen ist. An der Ankerplatte 50 befindet sich die Ankerplatte 20, die durch eine Magnetspule 48 des Magnetventils 12 angezogen wird. Die Ankerhülse 50 des in Figur 2 dargestellten Magnetventils 12 ist über eine Ventilfeder 46 beaufschlagt, welche sich am Injektorkörper des in Figur 2 dargestellten Kraftstoffinjektors 10 abstützt.2 shows that in the injector body of the fuel injector 10 there is a high-pressure inlet 42, via which a control chamber 24 is acted upon by fuel under system pressure. The high pressure inlet 42 extends in part through a throttle plate 44 within which a high pressure drain 52 extends. The solenoid valve 12 as shown in Figure 2 includes a pressure pin 64, which may for example be loosely received in the injector body of the fuel injector 10 and to which an anchor sleeve 50 is slidably received. At the anchor plate 50 is the anchor plate 20 which is attracted by a solenoid 48 of the solenoid valve 12. The armature sleeve 50 of the solenoid valve 12 shown in Figure 2 is acted upon by a valve spring 46 which is supported on the injector body of the fuel injector 10 shown in Figure 2.
Aus der Schnittdarstellung gemäß Figur 3 geht hervor, dass das dort dargestellte Magnetventil 12 den Druckstift 64 aufweist, an dessen Umfang mindestens eine Aussparung ausgebildet ist. Der in Figur 3 dargestellte Druckstift 64 mit mindestens einer Aussparung ist in der Drosselplatte 44 exzentrisch zur mit Bezugszeichen 62 bezeichneten Injektorachse angeordnet. Ein Ventilraum des Magnetventils 12 ist mit Bezugszeichen 60 bezeichnet.From the sectional view of Figure 3 shows that the solenoid valve 12 shown there has the pressure pin 64, on the circumference at least one recess is formed. The pressure pin 64 shown in Figure 3 with at least one recess is in the throttle plate 44 arranged eccentrically to the injector axis designated by reference numeral 62. A valve space of the solenoid valve 12 is designated by reference numeral 60.
Der in Figur 3 dargestellte Druckstift 64 kann zum Beispiel im Hochdruckablauf 52 der Drosselplatte 44 auch mittels einer Presspassung 66 aufgenommen sein. Der Druckstift 64 mit mindestens einer Aussparung am Umfang ist in einem ersten Durchmesser 74 sowie in einem zweiten Durchmesser 76 ausgebildet. Der in Figur 3 dargestellte Druckstift 64 mit mindestens einer Aussparung ist im Bereich des ersten Durchmessers 74, der kleiner gewählt ist als der zweite Durchmesser 76, innerhalb des Hochdruckablaufes 52 der Drossel- platte 44 aufgenommen. Der Druckstift 64 mit mindestens einer Aussparung kann alternativ zur Befestigung mittels einer Presspassung 66 auch mit Führungsspiel im Hochdruckablauf 52 der Drosselplatte 44 aufgenommen sein und sich - wie in Figur 2 dargestellt - am Injektorkörper des Kraftstoffinjektors 10 abstützen.The pressure pin 64 shown in Figure 3, for example, in the high-pressure outlet 52 of the throttle plate 44 may be received by means of a press fit 66. The pressure pin 64 with at least one recess on the circumference is formed in a first diameter 74 and in a second diameter 76. The pressure pin 64 shown in FIG. 3 with at least one recess is received in the region of the first diameter 74, which is selected to be smaller than the second diameter 76, within the high-pressure outlet 52 of the throttle plate 44. The pressure pin 64 having at least one recess may alternatively be accommodated for attachment by means of a press fit 66 with guide play in the high pressure drain 52 of the throttle plate 44 and - as shown in Figure 2 - supported on the injector of the fuel injector 10.
Die mindestens eine am Umfang des Druckstiftes 64 ausgebildete Aussparung kann - wie in Figur 2 dargestellt - zum Beispiel als Abflachung 72 im Bereich des Druckstiftes 64 ausgebildet sein, in welchem dieser einen ersten Durchmesser 74 aufweist, der geringer gewählt ist als der zweite Durchmesser 76 des Druckstiftes 64. In dem Bereich, in dem der Druckstift 64 mit dem zweiten Durchmesser 76 ausgebildet ist, wird am Druckstift 64 die Anker- hülse 50 geführt. Die Ankerhülse 50 bildet mit ihrer der Drosselplatte 44 zuweisenden Stirnseite einen Ventilsitz 68 mit einer Sitzerhebung 70 an der oberen Stirnseite der Drosselplatte 44 aus. Die Ankerhülse 50 des Magnetventils 12 ist - wie in Figur 2 dargestellt - durch die Ventilfeder 46 vorgespannt, die innerhalb eines Magnetkerns des Magnetventils 12 aufgenommen ist, welcher die Magnetspule 48 des Magnetventils 12 umschließt.The at least one formed on the circumference of the pressure pin 64 recess may - as shown in Figure 2 - be formed for example as a flattening 72 in the region of the pressure pin 64, in which it has a first diameter 74 which is selected to be smaller than the second diameter 76 of Pressure pin 64. In the area in which the pressure pin 64 is formed with the second diameter 76, the anchor sleeve 50 is guided on the pressure pin 64. The anchor sleeve 50 forms with its throttle plate 44 assigning end face a valve seat 68 with a seat lift 70 on the upper end side of the throttle plate 44. The armature sleeve 50 of the solenoid valve 12 is - as shown in Figure 2 - biased by the valve spring 46 which is received within a magnetic core of the solenoid valve 12 which surrounds the solenoid 48 of the solenoid valve 12.
An die Drosselplatte 44 des in Figur 2 im Schnitt dargestellten Kraftstoffinjektors 10 angrenzend befindet sich der Steuerraum 24, der durch eine Steuerraumhülse 82 begrenzt ist. Die Steuerraumhülse 82 kann zum Beispiel an der Druckstange 30 oder dem Einspritzventilglied 30 aufgenommen sein und mittels einer Feder 84 beaufschlagt werden, so dass die Steuerraumhülse 82 an die untere Stirnseite der Drosselplatte 44 angestellt ist. Der Steuerraum 24 ist über einen Hochdruckzulauf 42, der sich durch den Injektorkörper des Kraftstoffinjektors 10 und die Drosselplatte 44 erstreckt unter Zwischenschaltung einer in Figur 2 nicht dargestellten Zulaufdrossel, mit Systemdruck beaufschlagt. Die beim geöffneten Sitz 68 aus dem Steuerraum 24 abgesteuerte Steuermenge strömt über einen zum Bei- spiel als Nut ausgebildeten Ablauf 80 in einen Niederdruckbereich 78 des in Figur 2 im Schnitt dargestellten Kraftstoffinjektors ab und von dort über eine Niederdruckleitung beispielsweise in den Tank eines Kraftfahrzeugs zurück. Gemäß der Darstellung in Figur 2 wird bei Bestromung der Magnetspule 48 des Magnetventils 12 die Ankerplatte 20, die an der Ankerhülse 50 aufgenommen ist, angezogen. Durch die Anziehbewegung hebt die Ankerhülse 50 von der Sitzerhebung 70 ab, die zum Beispiel kegelförmig an der oberen Stirnseite der Drosselplatte 44 ausgebildet sein kann. Anstelle einer Sitzerhebung 70 kann der Ventilsitz 68 auch als Flachsitz ausgeführt sein, der zum Beispiel an der Oberseite der Drosselplatte 44 angeordnet ist. Über den Hochdruckablauf 52 und die in diesem ausgebildete Ablaufdrossel 26 strömt Kraftstoff aus dem Steuerraum 24 ab, so dass der Druck in diesem sinkt. Aufgrund der Druckabsenkung im Steuerraum 24 erfolgt ein Auffahren der Druckstange 30 oder des bevorzugt nadeiförmig ausge- bildeten Einspritzventilgliedes 30 unmittelbar, so dass am brennraumseitigen Ende - hier nicht dargestellt - des Kraftstoffinjektors 10 ausgebildete Einspritzöffnungen freigegeben werden und Kraftstoff in den Brennraum der Verbrennungskraftmaschine eingespritzt wird. Wird die Bestromung der Magnetspule 48 des Magnetventiles 12 hingegen unterbrochen, so wird die Ankerhülse 50, die verschieblich am Druckstift 64 mit mindestens einer Ausspa- rung im Bereich des zweiten Durchmessers 76 geführt ist, durch die Ventilfeder 46 wieder in den Ventilsitz 68 gedrückt. Die Druckentlastung des Steuerraumes 24 ist somit aufgehoben und der Druck im Steuerraum 24 steigt wieder an. Aufgrund des Druckanstieges im Steuerraum 24 wird die Druckstange 30 bzw. das bevorzugt nadeiförmig ausgebildete Einspritzventilglied 30 wieder in seinen Sitz gestellt, so dass Einspritzöffnungen am brennraum- seitigen Ende des Kraftstoffinjektors 10 wieder verschlossen werden und die Einspritzung beendet wird.Adjacent to the throttle plate 44 of the fuel injector 10 shown in section in FIG. 2 is the control chamber 24, which is delimited by a control chamber sleeve 82. The control chamber sleeve 82 may for example be received on the push rod 30 or the injection valve member 30 and acted upon by a spring 84, so that the control chamber sleeve 82 is employed at the lower end side of the throttle plate 44. The control chamber 24 is acted upon by a high-pressure inlet 42 which extends through the injector body of the fuel injector 10 and the throttle plate 44 with the interposition of an inlet throttle, not shown in Figure 2, with system pressure. The control quantity diverted from the control chamber 24 when the seat 68 is open flows, via a drain 80, for example, into a low-pressure region 78 of the fuel injector shown in section in FIG. 2, and from there back into the tank of a motor vehicle via a low-pressure line. As shown in FIG. 2, when the magnetic coil 48 of the solenoid valve 12 is energized, the armature plate 20, which is received on the armature sleeve 50, is attracted. As a result of the tightening movement, the armature sleeve 50 lifts off from the seat elevation 70, which, for example, can be designed conically on the upper end face of the throttle plate 44. Instead of a seat elevation 70, the valve seat 68 may also be designed as a flat seat, which is arranged, for example, on the upper side of the throttle plate 44. Fuel flows out of the control chamber 24 via the high-pressure drain 52 and the outlet throttle 26 formed therein, so that the pressure in the latter drops. Due to the pressure reduction in the control chamber 24, the pressure rod 30 or the preferably needle-shaped injection valve member 30 is driven open immediately, so that injection openings formed at the combustion chamber end - not shown here - of the fuel injector 10 are released and fuel is injected into the combustion chamber of the internal combustion engine. If, however, the energization of the solenoid coil 48 of the solenoid valve 12 is interrupted, the armature sleeve 50, which is slidably guided on the pressure pin 64 with at least one recess in the region of the second diameter 76, is pushed back into the valve seat 68 by the valve spring 46. The pressure relief of the control chamber 24 is thus canceled and the pressure in the control chamber 24 increases again. Due to the pressure increase in the control chamber 24, the push rod 30 and the preferably needle-shaped injection valve member 30 is placed back in its seat, so that injection ports on the combustion chamber side end of the fuel injector 10 are closed again and the injection is terminated.
Bei der in Figur 2 dargestellten Ausführungsvariante ist der Druckstift 64 mit seinem im Hochdruckablauf 52 aufgenommenen Bereich im ersten Durchmesser 74 ausgebildet. In diesem Bereich befindet sich die mindestens eine Aussparung, die als Abflachung 72 als Anschliff, als Nut oder dergleichen ausgeführt werden kann. Die mindestens eine Abflachung 72 am Umfang des Druckstiftes 64 führt den Hochdruck zum Ventilsitz 68 des Magnetventils 12 in der in Figur 2 dargestellten Ausführungsvariante. Eine den Hochdruckablauf 52 darstellende Bohrung in der Drosselplatte 44 kann in einem etwas größeren Durchmesser hergestellt werden, so dass sich der Druckstift 64 mit mindestens einer an dessen Umfang ausgebildeten Abflachung 72 innerhalb seines Führungsspiels an der Drosselplatte 44 ausrichtet. Neben einer Aufnahme des Druckstiftes 64 mit mindestens einer Aussparung im Hochdruckablauf 52 der Drosselplatte 44 kann der Druckstift 64 auch mit seinem im ersten Durchmesser 74 ausgebildeten Bereich mit einer Presspassung 66 in der Drosselplatte 44 befestigt werden, so dass der Hochdruckablauf-Querschnitt durch die mindestens eine Abflachung 72 am Umfang des Druckstiftes 64 begrenzt wird. Aus der Darstellung gemäß Figur 3 ist eine vormontierte Baugruppe aus Drosselplatte und Druckstift zu entnehmen.In the case of the embodiment variant shown in FIG. 2, the pressure pin 64 with its area recorded in the high-pressure drain 52 is formed in the first diameter 74. In this area is the at least one recess that can be performed as a flattening 72 as a bevel, as a groove or the like. The at least one flat 72 on the circumference of the pressure pin 64 leads the high pressure to the valve seat 68 of the solenoid valve 12 in the embodiment variant shown in FIG. A high pressure drain 52 performing bore in the throttle plate 44 can be made in a slightly larger diameter, so that the pressure pin 64 aligns with at least one formed on the circumference of the flattening 72 within the guide game on the throttle plate 44. In addition to a recording of the pressure pin 64 with at least one recess in the high-pressure drain 52 of the throttle plate 44, the pressure pin 64 can be fixed with its formed in the first diameter 74 area with a press fit 66 in the throttle plate 44, so that the high-pressure flow cross section through the at least one Flattening 72 is limited to the circumference of the pressure pin 64. From the illustration according to FIG. 3, a preassembled assembly of throttle plate and thrust pin can be seen.
Vor der Montage des Druckstiftes 64 in der Drosselplatte 44 wird der Druckstift 64 im Hinblick auf das Führungsspiel zum Innendurchmesser der Ankerhülse 50 mit dieser gepaart. Damit wird ein Führungsspiel zwischen dem zweiten Durchmesser 76 des Druckstiftes 64 und der Ankerhülse 50 hergestellt. Der nur im unteren Bereich, d. h. in dem Bereich, in dem der erste Durchmesser 74 ausgebildet ist, bearbeitete Druckstift 64 kann nun zum Beispiel mit Presspassung 66 in die Drosselplatte 44 eingepresst werden. Die vormontierte Baugruppe aus Drosselplatte 44 und Druckstift 64 kann nun über einen hochgenauen Schleifvorgang als vormontierte Baugruppe bearbeitet werden, so dass sich in einer hohen Oberflächengüte hergestellte Flächen 86 im Bereich der Sitzerhebung 70 an der Drosselplatte 44 und im Bereich des im zweiten Durchmesser 76 ausgebildeten Abschnittes des Druckstiftes 64 erzeugen lassen. Bevorzugt werden in einem Arbeitsgang in der Sitzerhebung 70 und dem Führungsbereich der Ankerhülse 50, d. h. in dem Abschnitt des Druckstiftes 64, in dem dieser im zweiten Durchmesser 76 ausgebildet ist, hochgenau bearbeitete Flächen 86 erzeugt. Damit lässt sich insbesondere bei kleinen Führungs- bzw. Sitzdurchmessern ein hochgenau arbeitendes, druckausgeglichenes Magnetventil bereitstellen, insbesondere dann, wenn der Durchmesser des Druckstiftes 64 und damit der Sitzdurchmesser des Ventilsitzes 68 sehr klein werden. Before mounting the pressure pin 64 in the throttle plate 44, the pressure pin 64 is paired with respect to the guide clearance to the inner diameter of the anchor sleeve 50 with this. Thus, a guide play between the second diameter 76 of the pressure pin 64 and the anchor sleeve 50 is made. The only in the lower area, d. H. In the region in which the first diameter 74 is formed, machined pressure pin 64 can now be pressed into the throttle plate 44, for example with a press fit 66. The preassembled assembly of throttle plate 44 and thrust pin 64 can now be edited as a preassembled assembly via a high-precision grinding process, so that in a high surface quality produced surfaces 86 in the region of the seat elevation 70 on the throttle plate 44 and in the region formed in the second diameter 76 section of the pressure pin 64 generate. Preference is given in one operation in the seat elevation 70 and the guide portion of the anchor sleeve 50, d. H. in the portion of the pressure pin 64 in which it is formed in the second diameter 76, highly accurately machined surfaces 86 generated. This makes it possible, in particular for small guide or seat diameters, to provide a high-precision, pressure-balanced solenoid valve, in particular when the diameter of the pressure pin 64 and thus the seat diameter of the valve seat 68 become very small.

Claims

Patentansprüche claims
1. Kraftstoffϊnjektor (10) mit einem Magnetventil (12), welches einen über einen Hochdruckzulauf (42) mit einem Systemdruck beaufschlagten Steuerraum (24) druckentlas- tet, dessen Hochdruckablauf (52) eine Ablaufdrossel (26) umfasst, und der an einemA fuel injector (10) having a solenoid valve (12) which depressurizes a control chamber (24) which is acted upon by a high-pressure inlet (42) and whose high-pressure outlet (52) comprises an outlet throttle (26)
Ventilsitz (68) des Magnetventils (12) mündet, dadurch gekennzeichnet, dass im Hochdruckablauf (52) der Drosselplatte (44) ein Druckstift (64) aufgenommen ist.Valve seat (68) of the solenoid valve (12) opens, characterized in that in the high-pressure outlet (52) of the throttle plate (44), a pressure pin (64) is added.
2. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass der Hoch- druckablauf (52) in der Drosselplatte (44) exzentrisch zur Achse (62) des Kraftstoffinjektors (10) verläuft.2. Fuel injector (10) according to claim 1, characterized in that the high-pressure drain (52) in the throttle plate (44) eccentrically to the axis (62) of the fuel injector (10).
3. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass der Druckstift (64) einen ersten Durchmesser (74) aufweist, mit dem der Druckstift (64) in Presspas- sung (66) im Hochdruckablauf (52) aufgenommen ist.3. Fuel injector (10) according to claim 1, characterized in that the pressure pin (64) has a first diameter (74) with which the pressure pin (64) in press fitting (66) in the high-pressure outlet (52) is received.
4. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass der Druckstift (64) einen zweiten Durchmesser (76) aufweist, an dem eine Ankerhülse (50) des Magnetventiles (12) geführt ist.4. fuel injector (10) according to claim 1, characterized in that the pressure pin (64) has a second diameter (76) on which an anchor sleeve (50) of the solenoid valve (12) is guided.
5. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass der Druckstift (64) innerhalb des im Hochdruckablauf (52) aufgenommen Bereiches mindestens eine Aussparung aufweist.5. fuel injector (10) according to claim 1, characterized in that the pressure pin (64) within the high-pressure drain (52) received area at least one recess.
6. Kraftstoffinjektor (10) gemäß Anspruch 5, dadurch gekennzeichnet, dass die mindestens eine Aussparung als Abflachung (72) am Umfang des Druckstiftes (64) ausgeführt ist.6. fuel injector (10) according to claim 5, characterized in that the at least one recess is designed as a flattening (72) on the circumference of the pressure pin (64).
7. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass die Drossel- platte (44) an der Mündung des Hochdruckablaufes (52) einen Ventilsitz (68) aufweist.7. Fuel injector (10) according to claim 1, characterized in that the throttle plate (44) at the mouth of the high pressure drain (52) has a valve seat (68).
8. Kraftstoffinjektor (10) gemäß Anspruch 7, dadurch gekennzeichnet, dass der Ventilsitz (68) an einer Stirnseite einer Ankerhülse (50) eine Sitzerhebung (70) umfasst oder als Flachsitz ausgeführt ist. .8. fuel injector (10) according to claim 7, characterized in that the valve seat (68) on a front side of an anchor sleeve (50) comprises a seat elevation (70) or is designed as a flat seat. ,
9. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass der in der Drosselplatte (44) montierte Druckstift (64) und die Drosselplatte (44) die in einem Arbeitsgang hergestellten geschliffenen Flächen (86) im zweiten Durchmesser (76) und im Bereich einer Erhebung (70) aufweisen.9. fuel injector (10) according to claim 1, characterized in that in the throttle plate (44) mounted pressure pin (64) and the throttle plate (44) in a Operation manufactured ground surfaces (86) in the second diameter (76) and in the region of a survey (70).
10. Kraftstoffinjektor (10) gemäß Anspruch 1, dadurch gekennzeichnet, dass die Drossel- platte (44) einen Ablauf (80) aufweist, über welchen eine aus dem Steuerraum (24) abgesteuerte Steuermenge einem Niederdruckbereich (58) des Kraftstoffinjektors (10) zuströmt. 10. Fuel injector (10) according to claim 1, characterized in that the throttle plate (44) has a sequence (80) via which a control space (24) diverted control amount flows to a low pressure region (58) of the fuel injector (10) ,
PCT/EP2007/058105 2006-10-04 2007-08-06 Fuel injector having a restrictor plate and a solenoid valve WO2008040588A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT07802499T ATE449251T1 (en) 2006-10-04 2007-08-06 FUEL INJECTOR WITH A THROTTLE PLATE AND A SOLENOID VALVE
EP07802499A EP2078157B1 (en) 2006-10-04 2007-08-06 Fuel injector having a restrictor plate and a solenoid valve
DE502007002086T DE502007002086D1 (en) 2006-10-04 2007-08-06 FUEL INJECTOR WITH A THROTTLE PLATE AND A SOLENOID VALVE
CN2007800373132A CN101523043B (en) 2006-10-04 2007-08-06 Fuel injector having a restrictor plate and a solenoid valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006046898.8 2006-10-04
DE102006046898A DE102006046898A1 (en) 2006-10-04 2006-10-04 Throttle plate for solenoid valve

Publications (1)

Publication Number Publication Date
WO2008040588A1 true WO2008040588A1 (en) 2008-04-10

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Application Number Title Priority Date Filing Date
PCT/EP2007/058105 WO2008040588A1 (en) 2006-10-04 2007-08-06 Fuel injector having a restrictor plate and a solenoid valve

Country Status (5)

Country Link
EP (1) EP2078157B1 (en)
CN (1) CN101523043B (en)
AT (1) ATE449251T1 (en)
DE (2) DE102006046898A1 (en)
WO (1) WO2008040588A1 (en)

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WO2008128884A1 (en) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Fuel injector with a magnetic valve
WO2008145514A1 (en) * 2007-06-01 2008-12-04 Robert Bosch Gmbh Armature stroke adjustment for solenoid valve
US20130185908A1 (en) * 2010-09-22 2013-07-25 Robert Bosch Gmbh Method for testing and repairing a fuel injector

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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
DE102010001170A1 (en) 2010-01-25 2011-07-28 Robert Bosch GmbH, 70469 Injection device with reduced pressure oscillations
DE102015213739A1 (en) * 2015-07-21 2017-01-26 Robert Bosch Gmbh Fuel injector and method of making a fuel injector
DE102016224208A1 (en) * 2016-12-06 2018-06-07 Robert Bosch Gmbh Electromagnetically actuable control valve for a fuel injector, fuel injector

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WO2007073968A1 (en) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Fuel injector for an internal combustion engine, and method of producing a control valve for a fuel injector

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DE102004054108A1 (en) * 2003-11-10 2005-06-09 Denso Corp., Kariya Three-way valve and having this fuel injector
WO2007073968A1 (en) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Fuel injector for an internal combustion engine, and method of producing a control valve for a fuel injector

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WO2008128884A1 (en) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Fuel injector with a magnetic valve
WO2008145514A1 (en) * 2007-06-01 2008-12-04 Robert Bosch Gmbh Armature stroke adjustment for solenoid valve
US20130185908A1 (en) * 2010-09-22 2013-07-25 Robert Bosch Gmbh Method for testing and repairing a fuel injector
US9228552B2 (en) * 2010-09-22 2016-01-05 Robert Bosch Gmbh Method for testing and repairing a fuel injector

Also Published As

Publication number Publication date
DE502007002086D1 (en) 2009-12-31
CN101523043A (en) 2009-09-02
EP2078157B1 (en) 2009-11-18
EP2078157A1 (en) 2009-07-15
DE102006046898A1 (en) 2008-04-10
CN101523043B (en) 2011-08-03
ATE449251T1 (en) 2009-12-15

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