EP1673532B1 - High pressure inlet for a common rail injector - Google Patents

High pressure inlet for a common rail injector Download PDF

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Publication number
EP1673532B1
EP1673532B1 EP04786800A EP04786800A EP1673532B1 EP 1673532 B1 EP1673532 B1 EP 1673532B1 EP 04786800 A EP04786800 A EP 04786800A EP 04786800 A EP04786800 A EP 04786800A EP 1673532 B1 EP1673532 B1 EP 1673532B1
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EP
European Patent Office
Prior art keywords
actuator
inlet
valve
chamber
actuator chamber
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
EP04786800A
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German (de)
French (fr)
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EP1673532A1 (en
Inventor
Giovanni Ferraro
Kasim-Melih Hamutcu
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1673532A1 publication Critical patent/EP1673532A1/en
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    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention relates to a valve for controlling fluids, having a valve housing, which has an actuator chamber and a laterally arranged inlet bore communicating with a high-pressure inlet, wherein the actuator chamber has an actuator with a punch and an Aktorkuppe, wherein the actuator chamber a cone seal has, which is formed by means of a conical surface at the end of the actuator chamber and a corresponding annular sealing surface on the Aktorkuppe, wherein the cable seal a cable outlet is sealable.
  • Such valves are from the EP 0 192 241 known.
  • the injection valves in particular in common rail injection systems, are provided with servo valves for controlling the fluid flows.
  • storage injection systems are used, which operate at very high injection pressures.
  • Such injection systems are known as common rail systems for diesel engines and HPDI injection systems for gasoline engines.
  • the fuel with a high-pressure pump in one promoted common accumulator from which the injectors are supplied to the individual cylinders with fuel.
  • the opening and closing of the injectors is usually controlled electronically.
  • a fuel injector for injecting fuel into the combustion chamber of an engine with a valve housing wherein in the valve housing, an actuator space is formed in which a piezoelectric actuator is arranged.
  • the actuator chamber leads an inlet bore, which is in communication with a high-pressure applied common-rail system.
  • the actuator has an Aktorkuppe with which the actuator is hydraulically tightly sealed with a formed on the actuator space sealing surface and by means of an additional sealing ring, so that within the sealing ring, the cable of the actuator can be led out of the valve housing.
  • Another fuel injector with a piezo actuator goes off WO 03/040538 A1 out.
  • the piezoelectric actuator is not exposed to the high pressure of the fuel inlet, but arranged within a low-pressure space. In this respect, no sealing problems of the actuator space in the region of the cable outlet of the piezoelectric actuator occur here. From the high-pressure connection, two supply bores lead directly into a nozzle needle pressure chamber, from which the fuel is injected through injection openings.
  • the actuator space has at least one additional inlet bore, which allows a distribution of the force on the Aktorkuppe and / or the punch.
  • the inlet bores are arranged symmetrically about the longitudinal axis of the actuator. This has the advantage that the forces are introduced uniformly, which has a favorable effect on the sealing function of the conical seal and the construction of the actuator.
  • a particularly cost-effective variant provides that the high pressure inlet is arranged centrally, along the central axis of the valve housing.
  • the cost advantage results from the simplified manufacturability of the centric bore.
  • the inlet bores extend at an acute angle to the central axis of the valve housing. This has the advantage that the injector wall thickness is increased by the acute-angled arrangement of the inlet bores and gives a greater overall strength.
  • a cross-sectional widening is arranged between the inlet bores and the high-pressure inlet. This cross-sectional extension forms a high pressure chamber and unsupported while a uniform distribution of the amount of fuel through the individual inlet holes.
  • the valve 1 has a valve housing 10 in which extends in the longitudinal direction of a pressure bore, which forms an actuator chamber 11.
  • an actuator 30 is mounted, which has a punch 31 and an Aktorkuppe 32.
  • the actuator chamber 11 is sealed at its one end by means of a conical seal to a cable outlet 17.
  • the conical seal is by means of a conical surface 14 at the end of Aktorraums 11 and a corresponding annular sealing surface 33 formed on the Aktorkuppe 32.
  • the actuator 30 may be formed as a piezoelectric actuator unit.
  • the operating principle provides that due to electrical voltage pulses, which are supplied to the actuator 30 via a cable due to changes in length of the punch 31 of the actuator 30, a valve opening which is located on the conical surface 14 opposite end of the valve housing 10 (not shown in the figure).
  • the fuel can be injected into the combustion chamber of an internal combustion engine.
  • the connection between cable outlet 17 and actuator 30 is realized by an obliquely to the longitudinal axis of the valve housing 10 extending bore 16, which forms a blending area with a blind bore 15.
  • more than two inlet bores can be provided, which are arranged symmetrically about the longitudinal axis of the actuator 30, preferably at equal angular intervals.
  • Particularly preferred embodiments have two inlet bores 13 which, relative to the longitudinal axis of the actuator 30 are opposite or three inlet bores 13, which, relative to the longitudinal axis of the actuator 30 are arranged at an angle of 120 °.

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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)

Abstract

The invention relates to a valve (1) for controlling liquids, comprising a valve housing (10) having an actuator chamber (11) and a laterally arranged inlet hole (13) that is connected to a high pressure inlet (12), wherein the actuator chamber (11) has an actuator (30) with a plunger (31) and a round end (32), wherein the actuator chamber (11) has a taper gasket that is configured by means of a conical surface (14) on the end of the actuator chamber (11) and a matching annular sealing surface (33) on the round end (32) of the actuator, wherein a cable outlet (17) can be sealed off with the taper gasket. The actuator chamber (11) has at least another inlet hole (13). This makes it possible to achieve a more even power distribution to the actuator (30).

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Ventil zum Steuern von Flüssigkeiten, mit einem Ventilgehäuse, welches einen Aktorraum und eine seitlich angeordnete Zulaufbohrung besitzt, die mit einem Hochdruckzulauf in Verbindung steht, wobei der Aktorraum einen Aktor mit einem Stempel und einer Aktorkuppe aufweist, wobei der Aktorraum eine Kegeldichtung besitzt, die mittels einer Kegelfläche am Ende des Aktorraumes und einer dazu korrespondierenden ringförmigen Dichtfläche an der Aktorkuppe ausgebildet ist, wobei mit der Kegeldichtung ein Kabelabgang abdichtbar ist.The invention relates to a valve for controlling fluids, having a valve housing, which has an actuator chamber and a laterally arranged inlet bore communicating with a high-pressure inlet, wherein the actuator chamber has an actuator with a punch and an Aktorkuppe, wherein the actuator chamber a cone seal has, which is formed by means of a conical surface at the end of the actuator chamber and a corresponding annular sealing surface on the Aktorkuppe, wherein the cable seal a cable outlet is sealable.

Derartige Ventile sind aus der EP 0 192 241 bekannt. Dabei sind die Einspritzventile, insbesondere bei Common-Rail-Einspritzsystemen, zur Steuerung der Fluidströme mit Servoventilen versehen. Für die Kraftstoffversorgung von Verbrennungsmotoren werden sogenannte Speichereinspritzsysteme verwendet, bei denen mit sehr hohen Einspritzdrücken gearbeitet wird. Solche Einspritzsysteme sind als Common-Rail-Systeme für Dieselmotoren und HPDI-Einspritzsysteme für Ottomotoren bekannt. Bei diesen Einspritzsystemen wird der Kraftstoff mit einer Hochdruckpumpe in einen gemeinsamen Druckspeicher gefördert, von dem aus die Einspritzventile an den einzelnen Zylindern mit Kraftstoff versorgt werden. Das Öffnen und Schließen der Einspritzventile wird dabei in der Regel elektronisch gesteuert.Such valves are from the EP 0 192 241 known. In this case, the injection valves, in particular in common rail injection systems, are provided with servo valves for controlling the fluid flows. For the fuel supply of internal combustion engines so-called storage injection systems are used, which operate at very high injection pressures. Such injection systems are known as common rail systems for diesel engines and HPDI injection systems for gasoline engines. In these injection systems, the fuel with a high-pressure pump in one promoted common accumulator, from which the injectors are supplied to the individual cylinders with fuel. The opening and closing of the injectors is usually controlled electronically.

Aus EP 1 096 136 A2 ist ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Kraftmaschine mit einem Ventilgehäuse bekannt, wobei in dem Ventilgehäuse ein Aktorraum ausgebildet ist, in dem ein Piezoaktor angeordnet ist. In den Aktorraum führt eine Zulaufbohrung, die mit einem mit Hochdruck beaufschlagten Common-Rail-System in Verbindung steht. Der Aktor weist eine Aktorkuppe auf, mit der der Aktor mit einer am Aktorraum ausgebildeten Dichtfläche und mittels eines zusätzlichen Dichtrings hydraulisch dicht abgedichtet ist, so dass innerhalb des Dichtrings das Kabel des Aktors aus dem Ventilgehäuse herausgeführt werden kann.Out EP 1 096 136 A2 a fuel injector for injecting fuel into the combustion chamber of an engine with a valve housing is known, wherein in the valve housing, an actuator space is formed in which a piezoelectric actuator is arranged. In the actuator chamber leads an inlet bore, which is in communication with a high-pressure applied common-rail system. The actuator has an Aktorkuppe with which the actuator is hydraulically tightly sealed with a formed on the actuator space sealing surface and by means of an additional sealing ring, so that within the sealing ring, the cable of the actuator can be led out of the valve housing.

Ein weiterer Kraftstoffinjektor mit einem Piezo-Aktor geht aus WO 03/040538 A1 hervor. Bei diesem Kraftstoffinjektor ist der Piezo-Aktor nicht dem Hochdruck des Kraftstoffzulaufs ausgesetzt, sondern innerhalb eines Niederdruckraums angeordnet. Insofern treten hier keine Dichtungsprobleme des Aktorraums im Bereich des Kabelabgangs des Piezo-Aktors auf. Vom Hochdruckanschluss führen hierbei zwei Zulaufbohrungen direkt in einen Düsennadeldruckraum, von dem aus der Kraftstoff durch Einspritzöffnungen eingespritzt wird.Another fuel injector with a piezo actuator goes off WO 03/040538 A1 out. In this fuel injector, the piezoelectric actuator is not exposed to the high pressure of the fuel inlet, but arranged within a low-pressure space. In this respect, no sealing problems of the actuator space in the region of the cable outlet of the piezoelectric actuator occur here. From the high-pressure connection, two supply bores lead directly into a nozzle needle pressure chamber, from which the fuel is injected through injection openings.

Aus DE 196 50 865 A1 ist weiterhin bekannt, dass der Kraftstoffinjektor einen seitlich in den Injektorkörper einmündenden Hochdruckanschluss aufweist. Über eine Hochdruckbohrung wird den Einspritzöffnungen die einzuspritzende Kraftstoffmenge zugeführt. Seitlich am Injektorkörper ist ein Anschlussbereich ausgebildet, von dem sich eine Zulaufbohrung erstreckt, die einen Aktorraum mit unter hohem Druck stehenden Kraftstoff versorgt. Ebenfalls mündet ein Kabelausgang in diesen Aktorraum. Damit kein Kraftstoff durch diesen Kabelausgang abfließen kann, wird der Kabelausgang über eine Kegeldichtung abgedichtet. Die dazu nötige Anpresskraft der Aktorkuppe auf die Kegeldichtfläche wird durch den Hochdruck im System erreicht.Out DE 196 50 865 A1 is also known that the fuel injector has a laterally opening into the injector high pressure port. Via a high-pressure bore, the injection openings are supplied with the fuel quantity to be injected. Laterally on the injector body, a connection region is formed, from which extends an inlet bore, which supplies an actuator chamber with fuel under high pressure. Also, a cable outlet opens into this actuator room. So that no fuel can flow through this cable outlet, the cable outlet is connected via a plug seal sealed. The required contact force of the Aktorkuppe on the conical sealing surface is achieved by the high pressure in the system.

Nachteilig an diesem bekannten Stand der Technik ist, dass durch diese Art der Konstruktion ein ungünstiges Kraftverhältnis an der Bohrungsverschneidung zum Aktorraum und zwischen der Kegelabdichtung entsteht. Durch die einseitige Bohrung kann aufgrund der extrem hohen Drücke - typisch bis 1600 bar - die Aktorkuppe des Aktors mit einer Querkraft beaufschlagt und undicht werden. Weiterhin können hohe mechanische Spannungen in diesem Verschneidungsbereich entstehen.A disadvantage of this known state of the art is that this type of construction creates an unfavorable force ratio at the bore intersection to the actuator space and between the conical seal. Because of the extremely high pressures - typically up to 1600 bar - the actuator's rocker arm can be subjected to a transverse force and leak due to the one-sided bore. Furthermore, high mechanical stresses can arise in this intersection area.

Es ist Aufgabe der Erfindung, ein Ventil der eingangs erwähnten Art zu schaffen, dass die erwähnten ungünstigen Kraftverhältnisse verhindert und eine sichere Abdichtung gewährleistet.It is an object of the invention to provide a valve of the type mentioned that prevents the aforementioned unfavorable force conditions and ensures a secure seal.

Vorteile der ErfindungAdvantages of the invention

Die Aufgabe wird dadurch gelöst, dass der Aktorraum mindestens eine zusätzliche Zulaufbohrung aufweist, welche eine Verteilung der Krafteinleitung auf die Aktorkuppe und/oder den Stempel ermöglicht.The object is achieved in that the actuator space has at least one additional inlet bore, which allows a distribution of the force on the Aktorkuppe and / or the punch.

Die Zulaufbohrungen sind symmetrisch um die Längsachse des Aktors angeordnet. Dies hat den Vorteil, dass die Kräfte gleichmäßig eingeleitet werden, was sich günstig auf die Dichtfunktion der Kegeldichtung und die Konstruktion des Aktors auswirkt.The inlet bores are arranged symmetrically about the longitudinal axis of the actuator. This has the advantage that the forces are introduced uniformly, which has a favorable effect on the sealing function of the conical seal and the construction of the actuator.

Gemäß einer bevorzugten Erfindungsvarianten münden die Zulaufbohrungen im Bereich der Kegelfläche, außerhalb der ringförmigen Dichtfläche in den Aktorraum ein. Dies hat den Vorteil, dass die Kräfte auf die Aktorkuppe einwirken können. Querkräfte, die sonst seitlich auf den Stempel des Aktors einwirken, werden damit weitgehend vermieden.According to a preferred variant of the invention, the inlet bores open in the region of the conical surface, outside the annular sealing surface into the actuator chamber. This has the advantage that the forces can act on the Aktorkuppe. Transverse forces, which otherwise act laterally on the punch of the actuator, thus largely avoided.

Eine besonders kostengünstige Variante sieht vor, dass der Hochdruckzulauf zentrisch, entlang der Mittelachse des Ventilgehäuses angeordnet ist. Der Kostenvorteil resultiert dabei aus der vereinfachten Herstellbarkeit der zentrischen Bohrung.A particularly cost-effective variant provides that the high pressure inlet is arranged centrally, along the central axis of the valve housing. The cost advantage results from the simplified manufacturability of the centric bore.

In einer bevorzugten Ausführungsform verlaufen die Zulaufbohrungen in einem spitzen Winkel zur Mittelachse des Ventilgehäuses. Dies hat den Vorteil, dass sich die Injektorwandstärke durch die spitzwinkelige Anordnung der Zulaufbohrungen erhöht und man eine größere Gesamtfestigkeit erhält.In a preferred embodiment, the inlet bores extend at an acute angle to the central axis of the valve housing. This has the advantage that the injector wall thickness is increased by the acute-angled arrangement of the inlet bores and gives a greater overall strength.

Weiterhin kann man die Gesamtfestigkeit dadurch erhöhen, dass die Querschnitte der Zulaufbohrungen gegenüber dem Querschnitt einer einzelnen Zulaufbohrung reduziert sind. Dadurch resultiert bei gleicher Kraftstoffmenge und höherer Anzahl an Zulaufbohrungen eine größere Wandstärke der einzelnen Zulaufbohrungen. Zudem kann eine Drosselfunktion durch den reduzierten Querschnitt erreicht werden.Furthermore, the overall strength can be increased by reducing the cross-sections of the inlet bores in relation to the cross-section of a single inlet bore. This results in the same amount of fuel and higher number of inlet holes a larger wall thickness of the individual inlet holes. In addition, a throttle function can be achieved by the reduced cross-section.

In einer bevorzugten Ausführungsform ist vorgesehen, dass zwischen den Zulaufbohrungen und dem Hochdruckzulauf eine Querschnittserweiterung angeordnet ist. Diese Querschnittserweiterung bildet eine Hochdruckkammer aus und unerstützt dabei eine gleichmäßige Verteilung der Kraftstoffmenge über die einzelnen Zulaufbohrungen.In a preferred embodiment, it is provided that a cross-sectional widening is arranged between the inlet bores and the high-pressure inlet. This cross-sectional extension forms a high pressure chamber and unsupported while a uniform distribution of the amount of fuel through the individual inlet holes.

Eine besonders kostengünstige Variante sieht vor, dass der Aktor als piezoelektrische Aktor-Einheit ausgebildet ist. Solche piezoelektrische Aktoren sind einfach zu handhaben, kostengünstig und wartungsfrei.A particularly cost-effective variant provides that the actuator is designed as a piezoelectric actuator unit. Such piezoelectric actuators are easy to handle, inexpensive and maintenance-free.

Zeichnungdrawing

Die Erfindung wird im folgenden anhand eines in den Figuren dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

  • Figur 1 schematisch in der Schnittansicht entlang der Längsachse einen Ausschnitt eines Ventils mit einem Hochdruckzulauf für einen Common Rail Injektor gemäß dem Stand der Technik;
  • Figur 2 schematisch in der Schnittansicht den Hochdruckzulauf des Ventils in einer erfinderischer Ausgestaltung;
  • Figur 3 schematisch in der Schnittansicht den Hochdruckzulauf des Ventils in einer weiteren Ausgestaltungsvariante gemäß der Erfindung.
The invention will be explained in more detail below with reference to an embodiment shown in FIGS. Show it:
  • FIG. 1 schematically in the sectional view along the longitudinal axis of a section of a valve with a high-pressure inlet for a common rail injector according to the prior art;
  • FIG. 2 schematically in the sectional view of the high-pressure inlet of the valve in an inventive embodiment;
  • FIG. 3 schematically in the sectional view of the high-pressure inlet of the valve in a further embodiment variant according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 zeigt ein Ventil 1 zum Steuern von Flüssigkeiten, insbesondere von Dieselkraftstoff, welches Teil eines Common Rail Injektors ist. FIG. 1 shows a valve 1 for controlling fluids, in particular diesel fuel, which is part of a common rail injector.

Das Ventil 1 weist ein Ventilgehäuse 10 auf, in der in Längsrichtung eine Druckbohrung verläuft, die einen Aktorraum 11 ausbildet. Im Aktorraum 11 ist ein Aktor 30 gelagert, der einen Stempel 31 und eine Aktorkuppe 32 aufweist. Der Aktorraum 11 ist an seinem einen Ende mittels einer Kegeldichtung zu einem Kabelabgang 17 abgedichtet. Die Kegeldichtung ist mittels einer Kegelfläche 14 am Ende des Aktorraums 11 und einer dazu korrespondierenden ringförmigen Dichtfläche 33 an der Aktorkuppe 32 ausgebildet.The valve 1 has a valve housing 10 in which extends in the longitudinal direction of a pressure bore, which forms an actuator chamber 11. In the actuator chamber 11, an actuator 30 is mounted, which has a punch 31 and an Aktorkuppe 32. The actuator chamber 11 is sealed at its one end by means of a conical seal to a cable outlet 17. The conical seal is by means of a conical surface 14 at the end of Aktorraums 11 and a corresponding annular sealing surface 33 formed on the Aktorkuppe 32.

Das Ventilgehäuse 10 weist weiterhin einen Hochdruckzulauf 12 auf, der mit einem hier nicht dargestellten Hochdruckspeicher für flüssigen Kraftstoff in Verbindung steht. Gemäß dem Stand der Technik wird der unter hohem Druck stehende Kraftstoff über eine Zulaufbohrung 13 seitlich dem Aktorraum 11 des Ventilgehäuses 10 zugeführt. Dabei können zusätzlich, wie in Figur 1 gezeigt, Filter 20 und / oder Zulaufdrosselelemente zwischen dem Hochdruckzulauf 12 und der Zulaufbohrung 13 vorgesehen sein. Die schräg zur Längsachse des Aktorraums 11 verlaufende Zulaufbohrung 13 mündet dabei seitlich in den Aktorraum 11, der einen ringförmigen Hohlraum um den Stempel 31 des Aktors 30 bildet. Dieser Hohlraum ist ständig mit Kraftstoff gefüllt, der unter extrem hohen Druck, typischerweise 1600 bar und mehr, steht.The valve housing 10 further has a high-pressure inlet 12, which is in communication with a high-pressure accumulator for liquid fuel, not shown here. According to the prior art, the high-pressure fuel is supplied laterally via an inlet bore 13 to the actuator chamber 11 of the valve housing 10. It can additionally, as in FIG. 1 shown, filter 20 and / or inlet throttle elements between the high-pressure inlet 12 and the inlet bore 13 may be provided. The oblique to the longitudinal axis of the actuator chamber 11 extending inlet bore 13 opens laterally into the actuator chamber 11, which forms an annular cavity around the punch 31 of the actuator 30. This cavity is constantly filled with fuel which is under extremely high pressure, typically 1600 bar and more.

Der Aktor 30 kann dabei als piezoelektrische Aktoreinheit ausgebildet sein. Das Wirkprinzip sieht dabei vor, dass durch elektrische Spannungsimpulse, die über ein Kabel dem Aktor 30 zugeführt werden, infolge von Längenänderungen des Stempels 31 des Aktors 30 eine Ventilöffnung kurzzeitig freigegeben wird, die sich am, der Kegelfläche 14 gegenüber liegenden Ende des Ventilgehäuses 10 befindet (in der Figur nicht dargestellt). Dadurch kann der Kraftstoff in den Brennraum einer Verbrennungskraftmaschine eingespritzt werden. Die Verbindung zwischen Kabelabgang 17 und Aktor 30 ist durch eine schräg zur Längsachse des Ventilgehäuses 10 verlaufenden Bohrung 16, die mit einer Sackbohrung 15 einen Verschneidungsbereich bildet, realisiert.The actuator 30 may be formed as a piezoelectric actuator unit. The operating principle provides that due to electrical voltage pulses, which are supplied to the actuator 30 via a cable due to changes in length of the punch 31 of the actuator 30, a valve opening which is located on the conical surface 14 opposite end of the valve housing 10 (not shown in the figure). As a result, the fuel can be injected into the combustion chamber of an internal combustion engine. The connection between cable outlet 17 and actuator 30 is realized by an obliquely to the longitudinal axis of the valve housing 10 extending bore 16, which forms a blending area with a blind bore 15.

Der Abdichtung des Aktorraums 11 gegenüber dem Kabelabgang 17 kommt hinsichtlich eines störungsfreien Betriebs einer besonderen Bedeutung zu. Dies wird üblicherweise durch die hohe Anpresskraft der Aktorkuppe 32 gegenüber der Kegelfläche 14 infolge des Hochdrucks der Flüssigkeit erreicht. Durch die Bohrungsverschneidung der Zulaufbohrung 13 mit dem Aktorraum 11 können aber ungünstige Kraftverhältnisse auftreten. Insbesondere durch die einseitig vorgesehene Zulaufbohrung 13 gemäß dem Stand der Technik können auf die Aktorkuppe 32 und den Stempel 31 des Aktors 30 Querkräfte einwirken, die bei der Kegeldichtung zu Undichtigkeiten und / oder zu unzulässig hohen Spannungen im Aktor 30 führen können.The sealing of the actuator chamber 11 with respect to the cable outlet 17 is of particular importance in terms of trouble-free operation. This is usually achieved by the high contact pressure of the Aktorkuppe 32 relative to the conical surface 14 due to the high pressure of the liquid. Due to the bore intersection of the inlet bore 13 with the actuator chamber 11 but unfavorable force relationships can occur. In particular, by the unilaterally provided inlet bore 13 according to the prior art can act on the Aktorkuppe 32 and the punch 31 of the actuator 30 transverse forces that can lead to leaks in the plug seal and / or too high voltages in the actuator 30.

Erfindungsgemäß wird daher eine Konstruktion vorgeschlagen, bei der mindestens eine weitere Zulaufbohrung 13 vorgesehen ist. In einer besonders bevorzugten Ausführungsform sind die Zulaufbohrungen 13 symmetrisch um die Längsachse des Aktors 30 angeordnet und sorgen dafür, dass die Kräfte gleichmäßig eingeleitet werden, was sich günstig auf die Dichtfunktion der Kegeldichtung und die Konstruktion des Aktors 30 auswirkt.According to the invention therefore, a construction is proposed in which at least one further inlet bore 13 is provided. In a particularly preferred embodiment, the inlet bores 13 are arranged symmetrically about the longitudinal axis of the actuator 30 and ensure that the forces are introduced uniformly, which has a favorable effect on the sealing function of the conical seal and the construction of the actuator 30.

Figur 2 zeigt eine der bevorzugten Ausführungsformen beispielhaft. FIG. 2 shows one of the preferred embodiments by way of example.

Das Ventilgehäuse 10 weist zwei gegenüberliegende Zulaufbohrungen 13 auf, die im Bereich der Kegelfläche 14, außerhalb der ringförmigen Dichtfläche 33 der Aktorkuppe 32 in den Aktorraum 11 einmünden. Der Hochdruckzulauf 12 ist bei diesem Ausführungsbeispiel zentrisch, entlang der Mittelachse des Ventilgehäuses 10 ausgebildet. Durch diese Geometrie kann zudem erreicht werden, dass die Zulaufbohrungen 13 in einem spitzen Winkel zur Mittelachse des Ventilgehäuses 10 verlaufen. Weiterhin kann, wie exemplarisch in Figur 2 gezeigt, eine Querschnittserweiterung 18 vorgesehen sein, die sich zwischen dem Hochdruckzulauf 12 und den Zulaufbohrungen 13 befindet. Diese Querschnittserweiterung 18 bildet eine Hochdruckkammer aus und unterstützt dabei eine gleichmäßige Verteilung der Kraftstoffmenge über die einzelnen Zulaufbohrungen 13. Die Querschnitte der Zulaufbohrungen 13 können gegenüber dem Querschnitt einer einzelnen Zulaufbohrung 13 reduziert ausgeführt sein.The valve housing 10 has two opposite inlet bores 13, which open in the region of the conical surface 14, outside the annular sealing surface 33 of the Aktorkuppe 32 in the actuator chamber 11. The high-pressure inlet 12 is centric in this embodiment, formed along the central axis of the valve housing 10. By this geometry can also be achieved that the inlet bores 13 extend at an acute angle to the central axis of the valve housing 10. Furthermore, as exemplified in FIG. 2 shown, a cross-sectional widening 18 may be provided, which is located between the high-pressure inlet 12 and the inlet bores 13. This cross-sectional widening 18 forms a high-pressure chamber and thereby supports a uniform distribution of the fuel quantity over the individual inlet bores 13. The cross-sections of the inlet bores 13 can be reduced compared with the cross-section of a single inlet bore 13.

Figur 3 zeigt eine erfindungsgemäße Ausführungsvariante, bei der die Zulaufbohrungen 13 gegenüber der in Figur 2 gezeigten Variante seitlich in den Aktorraum 11 einmünden. Die Zulaufbohrungen 13 sind ebenfalls gegenüberliegend angeordnet, wodurch eine symmetrische Krafteinleitung resultieren kann. FIG. 3 shows an embodiment variant according to the invention, in which the inlet bores 13 with respect to the in FIG. 2 shown variant laterally in the actuator space 11 merge. The inlet bores 13 are also arranged opposite, whereby a symmetrical introduction of force can result.

Grundsätzlich können auch mehr als zwei Zulaufbohrungen vorgesehen sein, die symmetrisch um die Längsachse des Aktors 30, vorzugsweise in gleichen Winkelabständen angeordnet sind. Besonders bevorzugte Ausführungsbeispiele besitzen zwei Zulaufbohrungen 13, die, bezogen auf die Längsachse des Aktors 30 gegenüber liegen oder auch drei Zulaufbohrungen 13, die, bezogen auf die Längsachse des Aktors 30 in einem Winkel von 120° angeordnet sind. Dadurch wird insbesondere eine Konstruktion erreicht, die einerseits Vorteile bei der Herstellung bietet und andererseits die Nachteile, die bei Anordnungen gemäß dem Stand der Technik auftreten können, vermeidet.In principle, more than two inlet bores can be provided, which are arranged symmetrically about the longitudinal axis of the actuator 30, preferably at equal angular intervals. Particularly preferred embodiments have two inlet bores 13 which, relative to the longitudinal axis of the actuator 30 are opposite or three inlet bores 13, which, relative to the longitudinal axis of the actuator 30 are arranged at an angle of 120 °. As a result, in particular, a construction is achieved which, on the one hand, offers advantages in the production and, on the other hand, avoids the disadvantages that can occur in arrangements according to the prior art.

Claims (7)

  1. Valve (1) for controlling liquids, with a valve housing (10) which has an actuator chamber (11) and a laterally arranged inlet bore (13) which is connected to a high-pressure inlet (12), wherein the actuator chamber (11) has an actuator (30) with a ram (31) and a spherical actuator cap (32), wherein the actuator chamber (11) has a conical seal which is formed by means of a conical surface (14) at the end of the actuator chamber (11) and an annular sealing surface (33), which corresponds thereto, on the spherical actuator cap (32), and wherein a cable outlet (17) can be sealed off by the conical seal, characterized in that the actuator chamber (11) has at least one additional inlet bore (13), and in that the inlet bores (13) are arranged symmetrically about the longitudinal axis of the actuator (30).
  2. Valve (1) according to Claim 1, characterized in that the inlet bores (13) open into the actuator chamber (11) in the region of the conical surface (14) and outside the annular sealing surface (33).
  3. Valve (1) according to at least either of Claims 1 and 2, characterized in that the high-pressure inlet (12) is arranged centrally along the central axis of the valve housing (10).
  4. Valve (1) according to at least one of Claims 1 to 3, characterized in that the inlet bores (13) run at an acute angle to the central axis of the valve housing (10).
  5. Valve (1) according to at least one of Claims 1 to 4, characterized in that the cross sections of the inlet bores (13) are reduced in size in comparison to the cross section of an individual inlet bore (13).
  6. Valve (1) according to at least one of Claims 1 to 5, characterized in that a cross-sectional expansion (18) is arranged between the inlet bores (13) and the high-pressure inlet (12).
  7. Valve (1) according to at least one of Claims 1 to 6, characterized in that the actuator (30) is designed as a piezoelectric actuator unit.
EP04786800A 2003-10-06 2004-09-17 High pressure inlet for a common rail injector Ceased EP1673532B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346243A DE10346243A1 (en) 2003-10-06 2003-10-06 High pressure feed for common rail injector for fuel control valve in internal combustion (IC) engine injection system, with valve housing containing actor chamber and lateral feed port coupled to high pressure feed, etc.
PCT/DE2004/002081 WO2005040596A1 (en) 2003-10-06 2004-09-17 High pressure inlet for a common rail injector

Publications (2)

Publication Number Publication Date
EP1673532A1 EP1673532A1 (en) 2006-06-28
EP1673532B1 true EP1673532B1 (en) 2008-03-19

Family

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Application Number Title Priority Date Filing Date
EP04786800A Ceased EP1673532B1 (en) 2003-10-06 2004-09-17 High pressure inlet for a common rail injector

Country Status (7)

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US (1) US20070040137A1 (en)
EP (1) EP1673532B1 (en)
JP (1) JP4226034B2 (en)
KR (1) KR20060120001A (en)
CN (1) CN100476193C (en)
DE (2) DE10346243A1 (en)
WO (1) WO2005040596A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196544A (en) * 2009-02-24 2010-09-09 Yanmar Co Ltd Fuel injection nozzle

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192241B1 (en) 1985-02-19 1988-09-21 Nippondenso Co., Ltd. Control valve for controlling fluid passage
US5025766A (en) * 1987-08-24 1991-06-25 Hitachi, Ltd. Fuel injection valve and fuel supply system equipped therewith for internal combustion engines
JPH03156165A (en) * 1989-11-09 1991-07-04 Yamaha Motor Co Ltd Feeder takeout structure of high-pressure fuel injection device
IT220661Z2 (en) * 1990-10-31 1993-10-08 Elasis Sistema Ricerca Fita Nel Mezzogiorno Soc.Consortile P.A. IMPROVEMENTS TO THE HIGH PRESSURE SEALING SYSTEM OF THE PILOT VALVE OF AN ELECTROMAGNETIC INJECTOR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES
US5288025A (en) * 1992-12-18 1994-02-22 Chrysler Corporation Fuel injector with a hydraulically cushioned valve
US5329908A (en) * 1993-06-08 1994-07-19 Cummins Engine Company, Inc. Compressed natural gas injection system for gaseous fueled engines
US5553781A (en) * 1995-01-03 1996-09-10 Servojet Products International Conversion of jerk type injector to accumulator type injector
DE19650865A1 (en) 1996-12-07 1998-06-10 Bosch Gmbh Robert magnetic valve
GB9925753D0 (en) * 1999-10-29 1999-12-29 Lucas Industries Ltd Fuel injector
ES2280318T3 (en) * 2000-07-18 2007-09-16 Delphi Technologies, Inc. FUEL INJECTOR.
DE10153629B4 (en) * 2001-10-31 2019-10-31 Robert Bosch Gmbh Method of injecting fuel

Also Published As

Publication number Publication date
US20070040137A1 (en) 2007-02-22
JP4226034B2 (en) 2009-02-18
JP2006525458A (en) 2006-11-09
DE10346243A1 (en) 2005-04-28
DE502004006608D1 (en) 2008-04-30
EP1673532A1 (en) 2006-06-28
KR20060120001A (en) 2006-11-24
CN1864006A (en) 2006-11-15
WO2005040596A1 (en) 2005-05-06
CN100476193C (en) 2009-04-08

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