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WO2009021864A1 - Control valve for a fuel injector - Google Patents

Control valve for a fuel injector Download PDF

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Publication number
WO2009021864A1
WO2009021864A1 PCT/EP2008/060166 EP2008060166W WO2009021864A1 WO 2009021864 A1 WO2009021864 A1 WO 2009021864A1 EP 2008060166 W EP2008060166 W EP 2008060166W WO 2009021864 A1 WO2009021864 A1 WO 2009021864A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
control
valve
guide pin
pin
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.)
Ceased
Application number
PCT/EP2008/060166
Other languages
German (de)
French (fr)
Inventor
Bernd Streicher
Ralf Nussbaumer
Rudolf Heinz
Holger Rapp
Christian Faltin
Nadja Eisenmenger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 WO2009021864A1 publication Critical patent/WO2009021864A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M63/0073—Pressure balanced 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a force-balanced control valve for a
  • Fuel injector of an internal combustion engine having the features of the preamble of claim 1.
  • a force-balanced control valve for a fuel injector is known from EP 1 612 403 A1, in which a control sleeve is guided axially movably on a valve body.
  • the control sleeve defines a valve chamber to the outside, which is connected to a control chamber of a nozzle needle of the fuel injector via a drain hole.
  • a closing spring By a closing spring, the control sleeve is pressed against a valve seat formed on the valve body and thereby closes the valve chamber to the outside.
  • the control sleeve is moved by an electromagnetic actuator and thereby operated without force, that is, is exerted on the control sleeve by the fuel in the valve chamber no resultant force in the direction of movement.
  • the control chamber of the nozzle needle is connected to a low-pressure / return system and as a result pressure-relieved.
  • Valve element is designed so that the resulting effective area over which the fuel pressure in the annular chamber acts on the control sleeve is equal to zero, so that the pressure exerted no opening or closing forces on the valve element. Due to the fact that the high-pressure fuel of a common rail of a Diesel injection system is provided, must be guided through the interior of the valve member in the valve chamber, the miniaturization of such a control valve limits. For example, with switchable pressures above 2000 bar only valve seat diameter of more than 2.5 mm can be realized, otherwise the risk of breakage of the valve piece in the
  • the object of the present invention is to avoid the occurrence of tensile stresses in the region of the bore intersections of the valve piece by a simple measure.
  • the object of the invention is achieved with the characterizing measures of claim 1.
  • the pressure threshold strength of the valve member is increased in the region of the guide pin. This makes it possible to further reduce the seat diameter of the valve seat and / or the
  • the pressing biasing force is expediently applied by means of a pressure pin, which acts on the guide pin.
  • the pressure pin is arranged between an abutment connected to a holding body and the guide pin.
  • the pressure pin is connected as a one-piece component with the guide pin.
  • the pressure pin between a valve seat facing away from the end face on the guide pin and the abutment formed on the holding body is arranged as a separate component.
  • the pressing biasing force is applied by an elastic spring element is arranged between the pressure pin and abutment and / or between the guide pin and pressure pin.
  • the elastic spring element may be designed as a plate spring or as a plate spring package. However, the elastic spring element can also be designed by an elastically formed pressure pin and / or by an elastically formed abutment.
  • FIG. 1 shows a cross section through a part of a fuel injector with a
  • FIG. 2 shows a cross section through a part of a fuel injector with a control valve.
  • FIG. 1 and 2 a control valve side section of a fuel injector for a common rail system of a diesel injector is shown in section.
  • the detail of the fuel injector shows an injector housing 10, a valve body 11, a valve piston 12 of a nozzle needle, not shown, a control valve 13, an electromagnetic actuator 14 and a housing 15 for the actuator 14.
  • the valve body 11 is inserted hydraulically tight in the injector 10 and has a guide portion 17 for the valve piston 12 and a valve piece 18 for the control valve 13.
  • a control chamber 20 is further formed, to which the valve piston 12 of the nozzle needle is exposed with a control surface 21.
  • an annular high-pressure chamber 22 is formed in the one
  • High-pressure bore 23 opens, which is hydraulically connected to a high pressure port 24 which is connected to the common rail system, not shown. From the high-pressure chamber 22, an inlet bore 25 with an inlet throttle leads into the control chamber 20. - A -
  • the valve piece 18 has a guide pin 30, on which a control sleeve 31 is guided axially displaceably with a guide bore 32.
  • the control sleeve 31 is further designed with a plate-shaped portion 33.
  • the control sleeve 31 acts with a sealing surface on a formed on the valve piece 18 valve seat 35 a.
  • valve chamber 36 is formed.
  • the valve chamber 36 is designed as an annular groove.
  • the control sleeve 31 is surrounded by a low-pressure chamber 37, which is connected to a pressurized with leak oil pressure, not shown, low pressure / return system.
  • a closing spring 38 acts on the control sleeve 31, so that the control sleeve 31 with the sealing surface against the
  • Valve seat 35 is held in the closed position.
  • valve piece 18 extending in the axial direction of the riser 41 and one of them, for example, radially branched transverse bore 42 are arranged, which connects the riser 41 with the valve chamber 36.
  • control chamber 20 is hydraulically connected to the valve chamber 36.
  • the adjusting element 14 which is for example a magnetic actuator, comprises a magnetic core 45 with a magnetic coil 46, which acts on a magnet armature 47.
  • the armature 47 is thereby formed by the plate-shaped portion 33 of the control sleeve 31.
  • the magnetic core 45 is fixed in the housing 15. In the magnetic core 45, a through hole 48 is formed.
  • the guide pin 30 is extended in the axial direction with a pressure pin 50, wherein the pressure pin 50 is biased with an end face 51 by means of a spring element, such as a plate spring 52 against an abutment 53.
  • a spring element such as a plate spring 52 against an abutment 53.
  • Abutment 53 is formed by a holding body 54, which also fixes the magnetic core 47.
  • the pressure pin 50 protrudes through the through hole 48 formed in the magnetic core 47.
  • the pressure pin 50 is designed with respect to its diameter so that it fits without contact through the inner diameter of the closing spring 38.
  • the pressure pin 50 is designed as a separate component 55 which is seated with a valve seat side end face 56 on an end face 57 of the guide pin 30.
  • FIG. 1 A second embodiment is shown in FIG. Here is the same
  • Pressure pin 50 designed as a formed on the guide pin 30 component 59, so that guide pin 30 and push pin 50 form a one-piece component.
  • a pressing biasing force F is induced in the axial direction in the guide pin 30.
  • the biasing force F should be on the order of magnitude of the force at which the portions of the valve member 18 located above and below the bore bore 40 and transverse bore 42 are pulled apart by the hydraulic pressure in the riser 41 and the transverse bore 42.

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 proposes a control valve for actuating a control chamber (20) of a fuel injector, having a control sleeve (32) which is guided in an axially movable manner on a guide journal (30). The guide journal (30) is acted on with a pressure-exerting preload force F, wherein a pressure pin (50) is provided which acts with the pressure-exerting preload force F on the guide pin (30).

Description

Beschreibung description

Titeltitle

Steuerventil für einen KraftstoffinjektorControl valve for a fuel injector

Die Erfindung betrifft ein kraftausgeglichenes Steuerventil für einenThe invention relates to a force-balanced control valve for a

Kraftstoffinjektor einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1.Fuel injector of an internal combustion engine having the features of the preamble of claim 1.

Stand der TechnikState of the art

Ein kraftausgeglichenes Steuerventil für einen Kraftstoffinjektor ist aus EP 1 612 403 Al bekannt, bei dem an einen Ventilkörper eine Steuerhülse axial beweglich geführt ist. Die Steuerhülse begrenzt eine Ventilkammer nach außen, der mit einem Steuerraum einer Düsennadel des Kraftstoffinjektors über eine Ablaufbohrung verbunden ist. Durch eine Schließfeder wird die Steuerhülse gegen einen am Ventilkörper ausgebildeten Ventilsitz gepresst und verschließt dadurch die Ventilkammer nach außen. Die Steuerhülse wird von einem elektromagnetischen Stellelement bewegt und dabei kraftfrei betrieben, d.h., dass auf die Steuerhülse durch den Kraftstoff in der Ventilkammer keine resultierende Kraft in deren Bewegungsrichtung ausgeübt wird. Zum Ansteuern der Düsennadel des Kraftstoffinjektors wird der Steuerraum der Düsennadel mit einem Niederdruck-/Rücklaufsystem verbunden und in Folge dessen druckentlastet.A force-balanced control valve for a fuel injector is known from EP 1 612 403 A1, in which a control sleeve is guided axially movably on a valve body. The control sleeve defines a valve chamber to the outside, which is connected to a control chamber of a nozzle needle of the fuel injector via a drain hole. By a closing spring, the control sleeve is pressed against a valve seat formed on the valve body and thereby closes the valve chamber to the outside. The control sleeve is moved by an electromagnetic actuator and thereby operated without force, that is, is exerted on the control sleeve by the fuel in the valve chamber no resultant force in the direction of movement. To control the nozzle needle of the fuel injector, the control chamber of the nozzle needle is connected to a low-pressure / return system and as a result pressure-relieved.

Derartig kraftausgeglichene Steuerventile zeichnen sich dadurch aus, dass dasSuch force-balanced control valves are characterized by the fact that the

Ventilelement so gestaltet ist, dass die resultierende Wirkfläche, über die der Kraftstoffdruck in der Ringkammer auf die Steuerhülse wirkt, gleich null ist, so dass durch den Druck keine öffnenden oder schließenden Kräfte auf das Ventilelement ausgeübt werden. Auf Grund der Tatsache, dass der unter Hochdruck stehende Kraftstoff der von einem Common-Rail einer Dieseleinspritzanlage bereitgestellt wird, durch das Innere des Ventilstücks in der Ventilkammer geführt werden muss, sind der Miniaturisierung eines solchen Steuerventils Grenzen gesetzt. So sind beispielsweise bei schaltbaren Drücken über 2000 bar nur Ventilsitzdurchmesser von mehr als 2,5 mm realisierbar, da ansonsten die Gefahr eines Bruchs des Ventilstücks im Bereich derValve element is designed so that the resulting effective area over which the fuel pressure in the annular chamber acts on the control sleeve is equal to zero, so that the pressure exerted no opening or closing forces on the valve element. Due to the fact that the high-pressure fuel of a common rail of a Diesel injection system is provided, must be guided through the interior of the valve member in the valve chamber, the miniaturization of such a control valve limits. For example, with switchable pressures above 2000 bar only valve seat diameter of more than 2.5 mm can be realized, otherwise the risk of breakage of the valve piece in the

Bohrungsverschneidungen auftritt. Der Grund hierfür liegt hauptsächlich in den mechanischen Zugspannungen, die infolge des hohen hydraulischen Drucks in den Bohrungen der hydraulischen Verbindung in diesem Bereich in das Material des Ventilstücks induziert werden.Bore intersections occurs. The reason for this is mainly in the mechanical tensile stresses induced in the material of the valve piece due to the high hydraulic pressure in the bores of the hydraulic connection in this area.

Aufgabe der vorliegenden Erfindung ist es, durch eine einfache Maßnahme das Auftreten von Zugspannungen im Bereich der Bohrungsverschneidungen des Ventilstücks zu vermeiden.The object of the present invention is to avoid the occurrence of tensile stresses in the region of the bore intersections of the valve piece by a simple measure.

Darlegung der ErfindungPresentation of the invention

Die Aufgabe der Erfindung wird mit den kennzeichnenden Maßnahmen des Anspruchs 1 gelöst. Durch diese Maßnahmen wird die Druckschwellfestigkeit des Ventilstücks im Bereich des Führungszapfens erhöht. Dadurch ist es möglich, den Sitzdurchmesser des Ventilsitzes weiter zu verringern und/oder denThe object of the invention is achieved with the characterizing measures of claim 1. By these measures, the pressure threshold strength of the valve member is increased in the region of the guide pin. This makes it possible to further reduce the seat diameter of the valve seat and / or the

Maximaldruck, der vom Steuerventil gesteuert wird, weiter zu erhöhen.Maximum pressure controlled by the control valve to increase further.

Vorteilhafte Weiterbildungen der Erfindung sind durch die Maßnahmen der Unteransprüche möglich.Advantageous developments of the invention are possible by the measures of the subclaims.

Die drückende Vorspannkraft wird zweckmäßigerweise mittels eines Druckstiftes aufgebracht, der auf den Führungszapfen einwirkt. Dabei ist der Druckstift zwischen einem mit einem Haltekörper verbundenen Widerlager und dem Führungszapfen angeordnet. Gemäß einer ersten Ausführungsform ist der Druckstift als ein einstückiges Bauteil mit dem Führungszapfen verbunden.The pressing biasing force is expediently applied by means of a pressure pin, which acts on the guide pin. In this case, the pressure pin is arranged between an abutment connected to a holding body and the guide pin. According to a first embodiment, the pressure pin is connected as a one-piece component with the guide pin.

Gemäß einer zweiten Ausführungsform ist der Druckstift zwischen einer vom Ventilsitz abgewandten Stirnfläche am Führungszapfen und dem am Haltekörper ausgebildeten Widerlager als ein separates Bauteil angeordnet. Die drückende Vorspannkraft wird aufgebracht, indem zwischen Druckstift und Widerlager und/oder zwischen Führungszapfen und Druckstift ein elastisches Federelement angeordnet ist. Das elastische Federelement kann als Tellerfeder oder als ein Tellerfederpaket ausgeführt sein. Das elastische Federelement kann aber auch von einem elastisch ausgebildeten Druckstift und/oder von einem elastisch ausgebildeten Widerlager ausgeführt sein.According to a second embodiment, the pressure pin between a valve seat facing away from the end face on the guide pin and the abutment formed on the holding body is arranged as a separate component. The pressing biasing force is applied by an elastic spring element is arranged between the pressure pin and abutment and / or between the guide pin and pressure pin. The elastic spring element may be designed as a plate spring or as a plate spring package. However, the elastic spring element can also be designed by an elastically formed pressure pin and / or by an elastically formed abutment.

Ausführungsbeispieleembodiments

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.

Es zeigen:Show it:

Figur 1 einen Querschnitt durch einen Teil eines Kraftstoffinjektors mit einem1 shows a cross section through a part of a fuel injector with a

Steuerventil undControl valve and

Figur 2 einen Querschnitt durch einen Teil eines Kraftstoffinjektors mit einem Steuerventil.2 shows a cross section through a part of a fuel injector with a control valve.

In Figur 1 und 2 ist ein steuerventilseitiger Ausschnitt eines Kraftstoffinjektors für ein Common-Rail-System einer Dieseleinspritzeinrichtung im Schnitt dargestellt. Der Ausschnitt des Kraftstoffinjektors zeigt einen Injektorgehäuse 10, einen Ventilkörper 11, einen Ventilkolben 12 einer nicht dargestellten Düsennadel, ein Steuerventil 13, ein elektromagnetisches Stellelement 14 und ein Gehäuse 15 für das Stellelement 14. Der Ventilkörper 11 ist im Injektorgehäuse 10 hydraulisch dicht eingesetzt und weist einen Führungsabschnitt 17 für den Ventilkolben 12 und ein Ventilstück 18 für das Steuerventil 13 auf. Im Ventilkörper 11 ist weiterhin ein Steuerraum 20 ausgebildet, dem der Ventilkolben 12 der Düsennadel mit einer Steuerfläche 21 ausgesetzt ist. Zwischen Injektorkörper 10 und Ventilkörper 11 ist ein ringförmiger Hochdruckraum 22 ausgebildet, in den eineIn Figures 1 and 2, a control valve side section of a fuel injector for a common rail system of a diesel injector is shown in section. The detail of the fuel injector shows an injector housing 10, a valve body 11, a valve piston 12 of a nozzle needle, not shown, a control valve 13, an electromagnetic actuator 14 and a housing 15 for the actuator 14. The valve body 11 is inserted hydraulically tight in the injector 10 and has a guide portion 17 for the valve piston 12 and a valve piece 18 for the control valve 13. In the valve body 11, a control chamber 20 is further formed, to which the valve piston 12 of the nozzle needle is exposed with a control surface 21. Between the injector body 10 and the valve body 11, an annular high-pressure chamber 22 is formed in the one

Hochdruckbohrung 23 mündet, die mit einem Hochdruckanschluss 24 hydraulisch verbunden ist, der an das nicht dargestellte Common-Rail-System angeschlossen ist. Vom Hochdruckraum 22 führt eine Zulaufbohrung 25 mit einer Zulaufdrossel in den Steuerraum 20. - A -High-pressure bore 23 opens, which is hydraulically connected to a high pressure port 24 which is connected to the common rail system, not shown. From the high-pressure chamber 22, an inlet bore 25 with an inlet throttle leads into the control chamber 20. - A -

Das Ventilstück 18 weist einen Führungszapfen 30 auf, an dem eine Steuerhülse 31 mit einer Führungsbohrung 32 axial verschiebbar geführt ist. Die Steuerhülse 31 ist weiterhin mit einem tellerförmigen Abschnitt 33 ausgeführt. Die Steuerhülse 31 wirkt mit einer Dichtfläche auf einen am Ventilstück 18 ausgebildeten Ventilsitz 35 ein. Zwischen Führungszapfen 30 und SteuerhülseThe valve piece 18 has a guide pin 30, on which a control sleeve 31 is guided axially displaceably with a guide bore 32. The control sleeve 31 is further designed with a plate-shaped portion 33. The control sleeve 31 acts with a sealing surface on a formed on the valve piece 18 valve seat 35 a. Between guide pin 30 and control sleeve

31 ist eine Ventilkammer 36 ausgebildet. Die Ventilkammer 36 ist dabei als Ringnut ausgeführt. Die Steuerhülse 31 ist von einem Niederdruckraum 37 umgeben, der mit einem mit Lecköldruck beaufschlagten, nicht dargestellten Niederdruck-/Rücklaufsystem verbunden ist. Eine Schließfeder 38 wirkt auf die Steuerhülse 31, so dass die Steuerhülse 31 mit der Dichtfläche gegen den31, a valve chamber 36 is formed. The valve chamber 36 is designed as an annular groove. The control sleeve 31 is surrounded by a low-pressure chamber 37, which is connected to a pressurized with leak oil pressure, not shown, low pressure / return system. A closing spring 38 acts on the control sleeve 31, so that the control sleeve 31 with the sealing surface against the

Ventilsitz 35 in Schließstellung gehalten wird.Valve seat 35 is held in the closed position.

Im Ventilstück 18 sind eine in axialer Richtung verlaufende Steigbohrung 41 und eine davon beispielsweise radial abzweigende Querbohrung 42 angeordnet, die die Steigbohrung 41 mit der Ventilkammer 36 verbindet. Über die SteigbohrungIn the valve piece 18 extending in the axial direction of the riser 41 and one of them, for example, radially branched transverse bore 42 are arranged, which connects the riser 41 with the valve chamber 36. About the riser hole

41 und die Querbohrung 42 wird der Steuerraum 20 hydraulisch mit der Ventilkammer 36 verbunden.41 and the transverse bore 42, the control chamber 20 is hydraulically connected to the valve chamber 36.

Das Stellelement 14, das beispielsweise ein Magnet-Aktor ist, umfasst einen Magnetkern 45 mit einer Magnetspule 46, die auf einen Magnetanker 47 einwirkt.The adjusting element 14, which is for example a magnetic actuator, comprises a magnetic core 45 with a magnetic coil 46, which acts on a magnet armature 47.

Der Magnetanker 47 wird dabei von dem tellerförmigen Abschnitt 33 der Steuerhülse 31 gebildet. Der Magnetkern 45 ist im Gehäuse 15 fixiert. Im Magnetkern 45 ist eine Durchgangsöffnung 48 ausgebildet. Das elektromagnetische Stellelement 14 bildet zusammen mit dem Steuerventil 13 ein Servo-Ventil zur Ansteuerung des Steuerraums 20, das als 2/2-Wege- Ventil arbeitet.The armature 47 is thereby formed by the plate-shaped portion 33 of the control sleeve 31. The magnetic core 45 is fixed in the housing 15. In the magnetic core 45, a through hole 48 is formed. The electromagnetic actuator 14, together with the control valve 13, a servo-valve for controlling the control chamber 20, which operates as a 2/2-way valve.

Der Führungszapfen 30 ist in axialer Richtung mit einem Druckstift 50 verlängert, wobei der Druckstift 50 mit einer Stirnfläche 51 mittels eines Federelements, beispielsweise einer Tellerfeder 52 gegen ein Widerlager 53 vorgespannt ist. DasThe guide pin 30 is extended in the axial direction with a pressure pin 50, wherein the pressure pin 50 is biased with an end face 51 by means of a spring element, such as a plate spring 52 against an abutment 53. The

Widerlager 53 wird dabei von einem Haltekörper 54 gebildet, der auch den Magnetkern 47 fixiert. Der Druckstift 50 ragt dabei durch die im Magnetkern 47 ausgebildete Durchgangsöffnung 48. Der Druckstift 50 ist dabei bezüglich seines Durchmessers so ausgeführt, dass er berührungsfrei durch den Innendurchmesser der Schließfeder 38 passt. Beim Ausführungsbeispiel in Figur 1 ist der Druckstift 50 als ein separates Bauteil 55 ausgeführt, das mit einer ventilsitzseitigen Stirnseite 56 auf einer Stirnfläche 57 des Führungszapfens 30 aufsitzt. Als weitere Ausführungsform ist denkbar, die Tellerfeder 52 zwischen der Stirnfläche 57 des Führungszapfens 30 und der ventilsitzseitigen Stirnseite 56 des separaten Druckstifts 55 anzuordnen, wobei dann die Stirnfläche 51 des Druckstifts 55 unmittelbar an dem das Widerlager 53 bildenden Haltekörper 54 anliegt.Abutment 53 is formed by a holding body 54, which also fixes the magnetic core 47. The pressure pin 50 protrudes through the through hole 48 formed in the magnetic core 47. The pressure pin 50 is designed with respect to its diameter so that it fits without contact through the inner diameter of the closing spring 38. In the embodiment in Figure 1, the pressure pin 50 is designed as a separate component 55 which is seated with a valve seat side end face 56 on an end face 57 of the guide pin 30. As a further embodiment, it is conceivable to arrange the plate spring 52 between the end face 57 of the guide pin 30 and the valve seat side end 56 of the separate pressure pin 55, in which case the end face 51 of the pressure pin 55 abuts directly on the holding body 54 forming the abutment 53.

Ein zweites Ausführungsbeispiel geht aus Figur 2 hervor. Hierbei ist derA second embodiment is shown in FIG. Here is the

Druckstift 50 als ein an den Führungszapfen 30 angeformtes Bauteil 59 ausgeführt, so dass Führungszapfen 30 und Druckstift 50 ein einteiliges Bauteil bilden.Pressure pin 50 designed as a formed on the guide pin 30 component 59, so that guide pin 30 and push pin 50 form a one-piece component.

Neben den genannten Ausführungsbeispielen ist auch denkbar, den Druckstift selbst und/oder dessen Widerlager als ein elastisches Element auszuführen, wobei eine elastische Ausführung des Druckstifts 50 durch eine entsprechende Dimensionierung der Außengeometrie des Druckstifts 50 erfolgt. Es ist außerdem denkbar, die komplette Abstützung der Magnetgruppe über den Druckstift 50 auszuführen, ohne dass die Magnetgruppe noch zusätzlich an ihremIn addition to the aforementioned embodiments, it is also conceivable to design the pressure pin itself and / or its abutment as an elastic element, wherein an elastic design of the pressure pin 50 is effected by a corresponding dimensioning of the outer geometry of the pressure pin 50. It is also conceivable to carry out the complete support of the magnetic group on the pressure pin 50, without the magnet group in addition to her

Außendurchmesser auf dem Haltekörper 54 aufliegt.Outside diameter rests on the holding body 54.

Durch das Einspannen des Druckstifts 50 am Widerlager 53 wird eine drückende Vorspannkraft F in axialer Richtung in den Führungszapfen 30 induziert. Die Vorspannkraft F sollte in der Größenordnung jener Kraft liegen, mit der die oberhalb und unterhalb der durch die Steigbohrung 40 und Querbohrung 42 sich ausbildende Bohrungsverschneidung gelegenen Teile des Ventilstücks 18 durch den hydraulischen Druck in der Steigbohrung 41 und der Querbohrung 42 auseinander gezogen werden. Damit führt der hydraulische Druck in den genannten Bohrungen nicht mehr zu Zugspannungen im Material desBy clamping the pressure pin 50 on the abutment 53, a pressing biasing force F is induced in the axial direction in the guide pin 30. The biasing force F should be on the order of magnitude of the force at which the portions of the valve member 18 located above and below the bore bore 40 and transverse bore 42 are pulled apart by the hydraulic pressure in the riser 41 and the transverse bore 42. Thus, the hydraulic pressure in said holes no longer leads to tensile stresses in the material of the

Ventilstücks 18 bzw. des Führungszapfens 30, sondern nur noch zu einer Verminderung der durch die Vorspannung erzeugten Druckspannungen, wodurch die Druckschwellfestigkeit des Ventilstücks 18 erhöht wird. Valve piece 18 and the guide pin 30, but only to a reduction of the compressive stresses generated by the bias, whereby the pressure threshold strength of the valve member 18 is increased.

Claims

Ansprüche claims 1. Steuerventil zum Ansteuern eines Steuerraums (20) eines Kraftstoffinjektors mit einer Steuerhülse (31), die an einem Führungszapfen (30) eines Ventilsstücks (18) axial beweglich geführt ist und mit einer Schließkraft gegen einen am Führungszapfen (30) oder am Ventilstück (18) ausgebildeten1. Control valve for controlling a control chamber (20) of a fuel injector with a control sleeve (31) which is axially movably guided on a guide pin (30) of a valve piece (18) and with a closing force against a guide pin (30) or on the valve piece (30). 18) trained Ventilsitz (35) drückt, wobei die Steuerhülse (31) von einem Stellelement (14) betätigbar ist, wobei zwischen Steuerhülse (32) und Führungszapfen (30) eine Ventilkammer (36) ausgebildet ist, die von der Steuerhülse (31) in Zusammenwirken mit dem Ventilsitz (35) begrenzt ist, wobei die Ventilkammer (36) und der Steuerraum (20) über eine hydraulischeValve seat (35) presses, wherein the control sleeve (31) by an actuating element (14) is actuated, wherein between the control sleeve (32) and guide pin (30) a valve chamber (36) is formed by the control sleeve (31) in cooperation with the valve seat (35) is limited, wherein the valve chamber (36) and the control chamber (20) via a hydraulic Verbindung (41, 42) verbunden sind, und wobei die Ventilkammer (36) in einen Niederdruckraum (37), der mit einem Niederdruck-/Rücklaufsystem hydraulisch verbunden ist, über den Ventilsitz (35) druckentlastbar ist, dadurch gekennzeichnet, dass der Führungszapfen (30) mit einer drückenden Vorspannkraft F beaufschlagt ist.Connection (41, 42) are connected, and wherein the valve chamber (36) in a low-pressure chamber (37), which is hydraulically connected to a low-pressure / return system, via the valve seat (35) is relieved of pressure, characterized in that the guide pin ( 30) is acted upon by a pressing biasing force F. 2. Steuerventil nach Anspruch 1, dadurch gekennzeichnet, dass ein Druckstift (50) vorgesehen ist, der mit der drückenden Vorspannkraft F auf den Führungszapfen (30) einwirkt.2. Control valve according to claim 1, characterized in that a pressure pin (50) is provided, which acts with the pressing biasing force F on the guide pin (30). 3. Steuerventil nach Anspruch 2, dadurch gekennzeichnet, dass der Druckstift (50) zwischen einem mit einem Haltekörper (54) verbundenen Widerlager (53) und dem Führungszapfen (30) angeordnet ist.3. Control valve according to claim 2, characterized in that the pressure pin (50) between a with a holding body (54) connected abutment (53) and the guide pin (30) is arranged. 4. Steuerventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der4. Control valve according to claim 2 or 3, characterized in that the Druckstift (50) als ein einstückiges Bauteil (59) mit dem Führungszapfen (30) verbunden ist.Pressure pin (50) is connected as a one-piece component (59) with the guide pin (30). 5. Steuerventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Druckstift (50) zwischen einer vom Ventilsitz (35) abgewandten Stirnfläche (57) am Führungszapfen (30) und einem Widerlager (53) als ein separates Bauteil (55) angeordnet ist.5. Control valve according to claim 2 or 3, characterized in that the pressure pin (50) between a valve seat (35) facing away from the end face (57) on the guide pin (30) and an abutment (53) is arranged as a separate component (55). 6. Steuerventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen Druckstift (50) und Widerlager (53) und/oder zwischen Führungszapfen (30) und Druckstift (50) ein elastisches Federelement angeordnet ist, das die drückende Vorspannkraft F aufbringt.6. Control valve according to one of the preceding claims, characterized in that between the pressure pin (50) and abutment (53) and / or between the guide pin (30) and pressure pin (50) an elastic spring element is arranged, which applies the pressing biasing force F. 7. Steuerventil nach Anspruch 6, dadurch gekennzeichnet, dass das elastische Federelement eine Tellerfeder (52) oder ein Tellerfederpaket ist.7. Control valve according to claim 6, characterized in that the elastic spring element is a plate spring (52) or a plate spring package. 8. Steuerventil nach Anspruch 6, dadurch gekennzeichnet, dass das elastische Federelement von einem elastisch ausgebildeten Druckstift (50) ausgeführt ist.8. Control valve according to claim 6, characterized in that the elastic spring element is designed by an elastically formed pressure pin (50). 9. Steuerventil nach Anspruch 6, dadurch gekennzeichnet, dass das elastische Federelement von einem elastisch ausgebildeten Widerlager (53) gebildet ist. 9. Control valve according to claim 6, characterized in that the elastic spring element is formed by an elastically formed abutment (53).
PCT/EP2008/060166 2007-08-14 2008-08-01 Control valve for a fuel injector Ceased WO2009021864A1 (en)

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EP1612403A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Servo valve for controlling an internal combustion engine fuel injector
EP1612405A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni An injection system for an internal-combustion engine
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