WO2004061290A1 - Control valve for injectors, in particular common rail injectors of internal combustion engines - Google Patents

Control valve for injectors, in particular common rail injectors of internal combustion engines Download PDF

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Publication number
WO2004061290A1
WO2004061290A1 PCT/DE2003/002143 DE0302143W WO2004061290A1 WO 2004061290 A1 WO2004061290 A1 WO 2004061290A1 DE 0302143 W DE0302143 W DE 0302143W WO 2004061290 A1 WO2004061290 A1 WO 2004061290A1
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Prior art keywords
control valve
control
injectors
valve piston
valve
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PCT/DE2003/002143
Other languages
German (de)
French (fr)
Inventor
Wolfgang Schmiderer
Michael Rainer Schmid
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.)
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Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2004061290A1 publication Critical patent/WO2004061290A1/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
    • 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 control valve for injectors, in particular for common rail injectors of internal combustion engines, which is arranged as a metering device for a high-pressure liquid, primarily fuel, in an injector body having a high-pressure liquid inlet, with a valve seat, in particular Solenoid valve seat, forming valve body, which has a control valve piston receiving and with the valve seat through an Neritatisbohrung hydraulically connected to an outlet throttle axial recess, at the control bore-side (upper) end a control chamber is formed; into which an inlet throttle hydraulically connected to the high-pressure liquid inlet opens laterally, the control valve piston interacting hydraulically with the connecting bore at its outlet throttle-side (upper) end.
  • Control valves of the aforementioned type are used in particular in so-called common rail injectors, that is to say in fuel injection systems of internal combustion engines.
  • the injector body is hydraulically connected to a central high-pressure accumulator (so-called common rail).
  • a nozzle needle In a multi-graded axial recess passing through the injector body, a nozzle needle, with its upper part at the same time forming the valve piston of the control valve, is axially movable and controls the fuel injection quantity emerging through the injection nozzle as a function of the pressure in the control chamber of the control valve body.
  • the control valve is usually a solenoid valve.
  • valve piston In the known control valves of the type in question, generally so-called 2/2-way valves, the valve piston has a flat end face at its (upper) end facing the control valve seat.
  • the valve piston in the valve body moves upwards. This causes the valve piston to throttle at the connection hole to the outlet throttle. This results in pressure vibrations in the pumped, high-pressure liquid (fuel), which lead to strong valve piston vibrations. This results (undesirably) in a wavy quantity map.
  • the object of the invention is to reduce the ripple in the quantity map by reducing the valve piston vibrations.
  • the object is achieved in a control valve of the type described in the introduction in that the outlet throttle-side (upper) end of the control piston is designed to be uneven on the end face, in such a way that it runs symmetrically towards a maximum point associated with the central axis of the control valve piston.
  • the outlet throttle-side (upper) end of the control valve piston preferably has a spherically curved end face.
  • the spherical valve piston end face should be spherically curved.
  • a radius of curvature of 18 mm or essentially 18 mm has proven to be advantageous.
  • the spherical (or obtuse / conical) design of the control valve piston end creates an approximately wedge-shaped “pinch gap” between the valve piston end and the flat surface of the valve body (valve body bottom) surrounding the connection bore to the outlet throttle, which dampens the throttling to the connection bore of the outlet throttle and thereby the valve piston vibrations reduced.
  • valve body base can be dispensed with entirely. Because the spherical (or obtuse-angled / conical) valve piston end will not "stick” hydraulically even with a slightly concave valve body base. This also results in a cost saving potential for valve body production.
  • Fig. 2 shows the upper end of the control valve piston in an enlarged view compared to FIG. 1.
  • valve body 10 a valve body of a control valve, e.g. Solenoid valve.
  • the valve body 10 is arranged in a known and therefore not shown manner in the housing body of a CR injector.
  • a conical control valve seat 12 is formed which interacts with a valve ball (not shown) which can be actuated in the usual way by an electromagnet (not shown).
  • valve body 10 has a.
  • a control chamber 15 At the upper end of the axial bore 13, forming a control chamber 15, there is - axially - a connecting bore 16 which merges into a discharge throttle 17.
  • the control chamber 15 is thus hydraulically connected to the conical control valve seat via the connection bore 16 and the discharge throttle 17.
  • Axial bore 13 forms a flat surface 19 surrounding the connecting bore 16, the valve body base.

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

Abstract

A control valve for injectors, in particular for common rail injectors of internal combustion engines acts as a metering device for a high-pressure liquid, especially fuel and is located in an injector body comprising a high-pressure liquid inlet. The valve comprises a valve body (10), which forms a valve seat (12), in particular a solenoid valve seat. The valve body (10) has an axial cavity (13) that houses a control valve plunger (14) and is hydraulically connected to the valve seat (12) by a connecting bore (16) to an output throttle (17). A control chamber (15) is configured at the end (19) of the cavity on the control bore side (upper end). An inlet throttle (18), which is hydraulically connected to the high-pressure liquid inlet, leads laterally into the control chamber (15). The end of the control valve plunger (14) on the output throttle side (upper end) (20) co-operates hydraulically with the connecting bore (16). A fundamental characteristic of said valve is that the end (20) of the control valve plunger (14) on the output throttle side (upper end) is configured unevenly, in such a way that it tapers symmetrically towards a maximum point (M) on the central axis (22) of the control valve plunger (14).

Description

STEUERVENTIL FÜR INJEKTOREN, INSBESONDERE COMMON-RAIL- INJEKTOREN VON BRENNKRAFTMASCHINENCONTROL VALVE FOR INJECTORS, IN PARTICULAR COMMON-RAIL INJECTORS OF INTERNAL COMBUSTION ENGINES
Stand der TechnikState of the art
Die Erfindung bezieht sich auf ein Steuerventil für Injektoren, insbesondere für Common-Rail-Injektoren von Brennkraftmaschinen, das als Zumesseinrichtung einer unter Hochdruck stehenden Flüssigkeit, vornehmlich von Kraftstoff, in einem einen Hochdruck-Flüssigkeitszulauf besitzenden Injektorkörper angeordnet ist, mit einem einen Ventilsitz, insbesondere Magnetventilsitz, bildenden Ventilkörper, der eine einen Steuerventilkolben aufnehmende und mit dem Ventilsitz durch eine Nerbindungsbohrung zu einer Ablaufdrossel hydraulisch verbundene Axialausnehmung aufweist, an deren steuerbohrungsseitigem (oberem) Ende ein Steuerraum ausgebildet ist; in den eine mit dem Hochdruck-Flüssigkeitszulauf hydraulisch verbundene Zulaufdrossel seitlich einmündet, wobei der Steuerventilkolben an seinem ablaufdrosselseitigen (oberen) Ende mit der Verbindungsbohrung hydraulisch zusammenwirkt.The invention relates to a control valve for injectors, in particular for common rail injectors of internal combustion engines, which is arranged as a metering device for a high-pressure liquid, primarily fuel, in an injector body having a high-pressure liquid inlet, with a valve seat, in particular Solenoid valve seat, forming valve body, which has a control valve piston receiving and with the valve seat through an Nerbindungsbohrung hydraulically connected to an outlet throttle axial recess, at the control bore-side (upper) end a control chamber is formed; into which an inlet throttle hydraulically connected to the high-pressure liquid inlet opens laterally, the control valve piston interacting hydraulically with the connecting bore at its outlet throttle-side (upper) end.
Steuerventile der vorbezeichneten Art kommen insbesondere in sog. Common-Rail- Injektoren, also in Kraftstoff-Einspritzsystemen von Brennkraftmaschinen, zum Einsatz. Hierbei steht der Injektorkörper mit einem zentralen Hochdruckspeicher (sog. Common-Rail) in hydraulischer Verbindung. In einer den Injektorkörper durchsetzenden, mehrfach abgestuften Axialausnehmung ist eine mit ihrem oberen Teilstück zugleich den Ventilkolben des Steuerventils bildende Düsennadel axial beweglich angeordnet, welche die durch die Einspritzdüse austretende Kraftstoff- Einspritzmenge in Abhängigkeit von dem Druck im Steuerraum des Steuerventilkörpers steuert. Bei dem Steuerventil handelt es sich in der Regel um ein Magnetventil.Control valves of the aforementioned type are used in particular in so-called common rail injectors, that is to say in fuel injection systems of internal combustion engines. The injector body is hydraulically connected to a central high-pressure accumulator (so-called common rail). In a multi-graded axial recess passing through the injector body, a nozzle needle, with its upper part at the same time forming the valve piston of the control valve, is axially movable and controls the fuel injection quantity emerging through the injection nozzle as a function of the pressure in the control chamber of the control valve body. The control valve is usually a solenoid valve.
Zum Stand der Technik bei derartigen magnetventilgesteuerten Injektoren seien - beispielsweise - die EP 0 661 442 A 1 und die US-PS 5, 901 , 941 genannt.The state of the art in such solenoid valve-controlled injectors may be mentioned, for example, EP 0 661 442 A1 and US Pat. No. 5,901,941.
Bei den bekannten Steuerventilen der in Rede stehenden Art, in der Regel sogenannte 2/2-Wege-Ventile besitzt der Ventilkolben an seinem dem Steuerventilsitz zugewandten (oberen) Ende eine plane Stirnfläche. Beim Öffnen des Steuerventils bewegt sich der Ventilkolben im Ventilkörper nach oben. Hierbei kommt es zu einem Androsseln des Ventilkolbens an der Verbindungsbohrung zur Ablaufdrossel. Dies hat Druckschwingungen in der geförderten, unter Hochdruck stehenden Flüssigkeit (Kraftstoff) zur Folge, die zu starken Ventilkolbenschwingungen führen. Es ergibt sich dadurch (unerwünscht) ein welliges Mengenkennfeld.In the known control valves of the type in question, generally so-called 2/2-way valves, the valve piston has a flat end face at its (upper) end facing the control valve seat. When the control valve is opened, the valve piston in the valve body moves upwards. This causes the valve piston to throttle at the connection hole to the outlet throttle. This results in pressure vibrations in the pumped, high-pressure liquid (fuel), which lead to strong valve piston vibrations. This results (undesirably) in a wavy quantity map.
Aufgabe der Erfindung ist es, die Welligkeit im Mengenkennfeld durch Reduzierung der Ventilkolbenschwingungen zu verringern.The object of the invention is to reduce the ripple in the quantity map by reducing the valve piston vibrations.
Vorteile der ErfindungAdvantages of the invention
Gemäß der Erfindung wird die Aufgabe bei einem Steuerventil der eingangs bezeichneten Gattung dadurch gelöst, dass das ablaufdrosselseitige (obere) Ende des Steuerkolbens stirnseitig uneben ausgebildet ist, derart, dass es symmetrisch auf einen der Mittelachse des Steuerventilkolbens zugehörigen Maximalpunkt zu- läuft.According to the invention, the object is achieved in a control valve of the type described in the introduction in that the outlet throttle-side (upper) end of the control piston is designed to be uneven on the end face, in such a way that it runs symmetrically towards a maximum point associated with the central axis of the control valve piston.
Vorzugsweise weist das ablaufdrosselseitige (obere) Ende des Steuerventilkolbens eine ballig gekrümmte Stirnfläche auf. Aus Gründen einer möglichst einfachen Herstellbarkeit sollte die ballige Ventilkolbenstirnseite kugelförmig gekrümmt sein. Hierbei hat sich ein Krümmungsradius von 18 mm oder im wesentlichen 18 mm als vorteilhaft erwiesen. Alternativ zu der genannten balligen Gestaltung der Ventilkolbenstirnseite ist es aber auch denkbar, diese stumpfwinklig konusförmig auszubilden.The outlet throttle-side (upper) end of the control valve piston preferably has a spherically curved end face. For the sake of being as simple as possible to manufacture, the spherical valve piston end face should be spherically curved. Here, a radius of curvature of 18 mm or essentially 18 mm has proven to be advantageous. As an alternative to the crowned design of the valve piston end face, it is also conceivable to make it obtuse-conical.
Durch die erfindungsgemäße ballige (bzw. stumpfwinklig/konische) Gestaltung des Steuerventilkolbenendes entsteht zwischen dem Ventilkolbenende und der die Verbindungsbohrung zur Ablaufdrossel umgebenden Planfläche des Ventilkörpers (Ventilkörperboden) ein etwa keilförmiger „Quetschspalt", der die Androsselung zur Verbindungsbohrung der Ablaufdrossel dämpft und dadurch die Ventilkolbenschwingungen reduziert.The spherical (or obtuse / conical) design of the control valve piston end according to the invention creates an approximately wedge-shaped “pinch gap” between the valve piston end and the flat surface of the valve body (valve body bottom) surrounding the connection bore to the outlet throttle, which dampens the throttling to the connection bore of the outlet throttle and thereby the valve piston vibrations reduced.
Aufgrund er einfachen Geometrie des balligen (bzw. stumpfwinklig/konischen) Ventilkolbenendes ist vorteilhafterweise eine praktische Verwirklichung der Erfindung möglich, ohne die bei der heutigen Serienfertigung einzuhaltenden Fertigungstoleranzen verringern zu müssen.Because of the simple geometry of the spherical (or obtuse-angled / conical) valve piston end, a practical implementation of the invention is advantageously possible without having to reduce the manufacturing tolerances to be observed in today's series production.
Ein weiterer Vorteil der Erfindung besteht darin, dass eine Schleifbearbeitung des sog. Ventilkörperbodens (s.o.) gänzlich entfallen kann. Denn das ballige (bzw. stumpfwinklig/konische) Ventilkolbenende wird auch bei leicht konkavem Ventilkörperboden nicht hydraulisch „kleben". Daraus ergibt sich zugleich auch ein Kosteneinsparungspotential für die Ventilkörperfertigung.Another advantage of the invention is that grinding of the so-called valve body base (see above) can be dispensed with entirely. Because the spherical (or obtuse-angled / conical) valve piston end will not "stick" hydraulically even with a slightly concave valve body base. This also results in a cost saving potential for valve body production.
Zeichnungdrawing
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, das im Folgenden detailliert beschrieben wird. Es zeigt:In the drawing, an embodiment of the invention is shown, which is described in detail below. It shows:
Fig. 1 - im vertikalen Längsschnitt - eine Ausführungsform eines Steuerventils (teilweise dargestellt) für einen CR-Injektor, undFig. 1 - in vertical longitudinal section - an embodiment of a control valve (partially shown) for a CR injector, and
Fig. 2 das obere Ende des Steuerventilkolbens in gegenüber Fig. 1 vergrößerter Darstellung. Beschreibung des AusführunqsbeispielsFig. 2 shows the upper end of the control valve piston in an enlarged view compared to FIG. 1. Description of the execution example
Es bezeichnet 10 einen Ventilkörper eines Steuerventils, z.B. Magnetventils. Der Ventilkörper 10 ist in bekannter und daher nicht näher gezeigter Weise im Gehäusekörper eines CR-Injektors angeordnet. An der Stirnfläche eines oberen, flanschartig verbreiterten Bereichs 11 des Ventilkörpers 10 ist ein konischer Steuerventilsitz 12 ausgebildet, der mit einer Ventilkugel (nicht gezeigt) zusammenwirkt, die in üblicher Weise durch einen (nicht gezeigten) Elektromagneten betätigbar sein kann.It designates 10 a valve body of a control valve, e.g. Solenoid valve. The valve body 10 is arranged in a known and therefore not shown manner in the housing body of a CR injector. On the end face of an upper, flange-like widened area 11 of the valve body 10, a conical control valve seat 12 is formed which interacts with a valve ball (not shown) which can be actuated in the usual way by an electromagnet (not shown).
Wie des Weiteren aus Fig. 1 hervorgeht, weist der Ventilkörper 10 eine .As can further be seen from FIG. 1, the valve body 10 has a.
Axialbohrung 13 auf, in der ein Steuerventilkolben 14 axial beweglich angeordnet ist. An das obere, einen Steuerraum 15 bildende Ende der Axialbohrung 13 schließt sich - axial - eine Verbindungsbohrung 16 an, die in eine Ablaufdrossel 17 übergeht. Der Steuerraum 15 ist somit über die Verbindungsbohrung 16 und die Ablaufdrossel 17 mit dem konischen Steuerventilsitz hydraulisch verbunden.Axial bore 13 in which a control valve piston 14 is arranged axially movable. At the upper end of the axial bore 13, forming a control chamber 15, there is - axially - a connecting bore 16 which merges into a discharge throttle 17. The control chamber 15 is thus hydraulically connected to the conical control valve seat via the connection bore 16 and the discharge throttle 17.
In den Steuerraum 15 mündet ferner - radial - eine Zulaufdrossel 18 ein, die mit dem Hochdruck-Zulauf des Injektorkörpers (nicht dargestellt) hydraulisch verbunden ist. Den oberen Abschluss des Steuerraumes 15 wie auch derAn inlet throttle 18, which is hydraulically connected to the high-pressure inlet of the injector body (not shown), also opens into the control chamber 15. The upper end of the control room 15 as well
Axialbohrung 13 bildet eine die Verbindungsbohrung 16 umgebende plane Fläche 19, der Ventilkörperboden.Axial bore 13 forms a flat surface 19 surrounding the connecting bore 16, the valve body base.
Eine wesentliche Besonderheit besteht darin - siehe hierzu insbesondere auch Fig. 2 -, dass die mit 20 bezifferte Stirnseite des Steuerventilkolbens 14 kugelförmig/ballig ausgebildet ist, wobei der Krümmungsradius R 18 mm oder ca. 18 mm beträgt. Der Steuerventilkolben 14 ist also stirnseitig nicht ebenflächig ausgebildet, sondern läuft symmetrisch auf einen der Mittelachse 22 des Steuerventilkolbens 14 zugehörigen Maximalpunkt M zu. Dadurch ergibt sich - selbst dann noch, wenn der Steuerventilkolben 14 an dem Ventilkörperboden 19 zur Anlage kommt, - zwischen der Stirnseite 20 des Steuerventilkolbens 14 und dem Ventilkörperboden 19 ein schmaler keilförmiger Spalt (sog. Quetschspalt), der in Fig. 2 mit 21 bezeichnet ist. An essential peculiarity is - see in particular also FIG. 2 in this regard - that the end face of the control valve piston 14, which is numbered 20, is spherical / spherical, the radius of curvature R being 18 mm or approximately 18 mm. The control valve piston 14 is therefore not flat on the end face, but runs symmetrically toward a maximum point M belonging to the central axis 22 of the control valve piston 14. This results - even when the control valve piston 14 comes into contact with the valve body base 19 - between the end face 20 of the control valve piston 14 and the valve body base 19, a narrow wedge-shaped gap (so-called pinch gap), designated 21 in FIG. 2 is.

Claims

PATENTANSPRÜCHE
1. Steuerventil für Injektoren, insbesondere für Common-Rail-Injektoren von Brennkraftmaschinen, das als Zumesseinrichtung einer unter Hochdruck stehenden Flüssigkeit, vornehmlich von Kraftstoff, in einem einen Hochdruck- Flüssigkeitszulauf besitzenden Injektorkörper angeordnet ist, mit einem einen1. Control valve for injectors, in particular for common rail injectors of internal combustion engines, which is arranged as a metering device for a liquid under high pressure, primarily fuel, in an injector body having a high-pressure liquid inlet, with one
Ventilsitz (12), insbesondere Magnetventilsitz, bildenden Ventilkörper (10), der eine einen Steuerventilkolben (14) aufnehmende und mit dem Ventilsitz (12) durch eine Verbindungsbohrung (16) zu einer Ablaufdrossel (17) hydraulisch verbundene Axialausnehmung (13) aufweist, an deren steuerbohrungseitigem (oberem) Ende (19) ein Steuerraum (15) ausgebildet ist, in den eine mit demValve seat (12), in particular a solenoid valve seat, forms a valve body (10) which has an axial recess (13) which receives a control valve piston (14) and is hydraulically connected to the valve seat (12) through a connecting bore (16) to an outlet throttle (17) whose control bore-side (upper) end (19) has a control chamber (15) in which one with the
Hochdruck-Flüssigkeitszulauf hydraulisch verbundene Zulaufdrossel (18) seitlich einmündet, wobei der Steuerventilkolben (14) an seinem ablaufdrosselseitigen (oberen) Ende (20) mit der Verbindungsbohrung (16) hydraulisch zusammenwirkt, dadurch gekennzeichnet, dass das ablaufdrosselseitige (obere) Ende (20) des Steuerventilkolbens (14) stirnseitig uneben ausgebildet ist, derart, dass es symmetrisch auf einen der Mittelachse (22) des Steuerventilkolbens (14) zugehörigen Maximalpunkt (M) zuläuft.High-pressure liquid inlet hydraulically connected inlet throttle (18) opens laterally, the control valve piston (14) interacting hydraulically at its outlet throttle-side (upper) end (20) with the connecting bore (16), characterized in that the outlet throttle-side (upper) end (20) of the control valve piston (14) is designed to be uneven on the end face such that it runs symmetrically to a maximum point (M) associated with the central axis (22) of the control valve piston (14).
2. Steuerventil nach Anspruch 1 , dadurch gekennzeichnet, dass das ablaufdrosselseitige (obere) Ende (20) des Steuerventilkolbens (14) eine ballig gekrümmte Stirnseite (20) aufweist.2. Control valve according to claim 1, characterized in that the outlet throttle-side (upper) end (20) of the control valve piston (14) has a spherically curved end face (20).
3. Steuerventil nach Anspruch 2, dadurch gekennzeichnet, dass die Stirnseite (20) des ablaufdrosselseitigen (oberen) Endes (20) des Steuerventilkolbens (14) kugelförmig gekrümmt ausgebildet ist. 3. Control valve according to claim 2, characterized in that the end face (20) of the outlet throttle-side (upper) end (20) of the control valve piston (14) is spherically curved.
4. Steuerventil nach Anspruch 3, dadurch gekennzeichnet, dass der Krümmungsradius (R) der kugelförmig gekrümmten Steuerventilkolben- Stirnseite (20) 18 mm oder im wesentlichen 18 mm beträgt.4. Control valve according to claim 3, characterized in that the radius of curvature (R) of the spherically curved control valve piston end face (20) is 18 mm or essentially 18 mm.
5. Steuerventil nach Anspruch 1 , dadurch gekennzeichnet, dass die Stirnseite (20) des ablaufdrosselseitigen (oberen) Endes (20) des Steuerventilkolbens (14) stumpfwinklig/konusförmig ausgebildet ist. 5. Control valve according to claim 1, characterized in that the end face (20) of the outlet throttle-side (upper) end (20) of the control valve piston (14) is obtuse-angled / conical.
PCT/DE2003/002143 2002-12-20 2003-06-27 Control valve for injectors, in particular common rail injectors of internal combustion engines WO2004061290A1 (en)

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DE2002159950 DE10259950A1 (en) 2002-12-20 2002-12-20 Control valve for injectors, in particular common rail injectors of internal combustion engines
DE10259950.5 2002-12-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042293A1 (en) * 2008-09-23 2010-03-25 Robert Bosch Gmbh Injector for injecting high-pressure fuel into the combustion chamber of an internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901941A (en) * 1995-07-14 1999-05-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Electromagnetic metering valve for a fuel injector
EP0916842A1 (en) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Device for controlling an internal combustion engine fuel injector
WO2001014722A1 (en) * 1999-08-23 2001-03-01 Robert Bosch Gmbh Compact-size injector for a common-rail-injection system utilized in internal combustion engines
WO2002095217A1 (en) * 2001-05-21 2002-11-28 Robert Bosch Gmbh High pressure sealing element for injectors
WO2003054375A1 (en) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Fuel injection device for an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901941A (en) * 1995-07-14 1999-05-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Electromagnetic metering valve for a fuel injector
EP0916842A1 (en) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Device for controlling an internal combustion engine fuel injector
WO2001014722A1 (en) * 1999-08-23 2001-03-01 Robert Bosch Gmbh Compact-size injector for a common-rail-injection system utilized in internal combustion engines
WO2002095217A1 (en) * 2001-05-21 2002-11-28 Robert Bosch Gmbh High pressure sealing element for injectors
WO2003054375A1 (en) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Fuel injection device for an internal combustion engine

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