EP1504187B1 - Injector for fuel injection - Google Patents

Injector for fuel injection Download PDF

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Publication number
EP1504187B1
EP1504187B1 EP03735282A EP03735282A EP1504187B1 EP 1504187 B1 EP1504187 B1 EP 1504187B1 EP 03735282 A EP03735282 A EP 03735282A EP 03735282 A EP03735282 A EP 03735282A EP 1504187 B1 EP1504187 B1 EP 1504187B1
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EP
European Patent Office
Prior art keywords
injector
throttle
module
port
control
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.)
Expired - Lifetime
Application number
EP03735282A
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German (de)
French (fr)
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EP1504187A1 (en
Inventor
Martin Neumaier
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Siemens AG
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Siemens AG
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the present invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
  • Fuel injection injectors (DE 19936667 A1) are known, for example, for common rail systems in different configurations.
  • a conventionally constructed injector comprises a nozzle needle, which communicates indirectly via a control piston or directly with a control chamber, which is pressurized. If the same pressure prevails at the nozzle and at the control chamber, a resulting force is generated by the geometrically predetermined ratio of the surfaces to which the pressure is applied. For example, if the area on the nozzle is smaller than the area on the control piston, a resultant force is created which forces the nozzle needle into its seat and thus closes the nozzle.
  • the control chamber is connected via a so-called inlet throttle with a high pressure region from a memory (rail), which is also guided to the nozzle at the same time.
  • a so-called outlet throttle Via a so-called outlet throttle, the control room is further connected to a shut-off valve. Since the outlet throttle has a larger flow cross-section than the inlet throttle, the pressure in the control chamber decreases by the opening of the shut-off valve. By this pressure reduction in the control chamber, the resulting force on the nozzle needle changes, so that the nozzle needle lifts from its seat and fuel can flow through the injection holes in a combustion chamber of the engine.
  • the control chamber and the inlet throttle and the outlet throttle were each introduced into an injector body. As a result, the injector body has a relatively complicated structure and is To make relatively complicated from a manufacturing point of view, since a variety of operations must be performed on the injector body.
  • the injector according to the invention is constructed such that an inlet throttle and an outlet throttle are provided in a throttle module designed as a separate component.
  • the arrangement of the two throttles in a separate component manufacturing advantages can be achieved because the chokes, which must be made with a very high accuracy, can be easily accessible introduced in the separate component. Subsequently, a mounting of the throttle module in the injector.
  • a reset element e.g. a coil spring arranged to return the control means of the injector.
  • a recess is formed in the separate throttle module, which provides at least a portion of the control chamber of the injector.
  • the injector according to the invention can be made even more compact in the axial direction.
  • the inlet throttle is preferably arranged in the radial direction to the injector axis. Particularly preferred is the Supply throttle while under pressure fuel supplied via an arranged between the injector body and the separate throttle module annular gap.
  • the annular gap is preferably sealed in the axial direction.
  • the sealing takes place by means of cutting edges, which undergo a plastic deformation during assembly or cause a plastic deformation of the other component, so that a secure seal is made possible.
  • the throttle module is arranged in a stepped bore of the injector body with at least two stages.
  • a sealing of the annular gap in the axial direction at the steps of the stepped bore can be formed either in the throttle module or at the stages in the injector body.
  • Another possibility of sealing the annular gap between the injector body and the throttle module is a seal in the radial direction of the injector.
  • the radial seal can be done for example by means of an elastic ring seal or a press fit.
  • the single figure shows a schematic sectional view of a portion of an injector with a throttle module according to the invention.
  • the injector 1 comprises an injector body 2, in which a throttle module 5 and a control module 13 are arranged. Furthermore, a nozzle needle 3 is arranged in the injector body 2 and guided in the axial direction X-X of the injector in the injector body 2.
  • the throttle module 5 is formed as a separate component. In the throttle module 5, an inlet throttle 6 and an outlet throttle 7 is formed. Furthermore, a section U-shaped recess 8 is formed at the end directed toward the nozzle needle 3 of the throttle module 5. This recess 8 provides a control chamber 4 between the throttle module 5 and the nozzle needle 3 ready.
  • the control module 13 comprises a valve 15, which can be actuated via a control unit, not shown, such as a magnetic element or a piezoelectric actuator.
  • the valve 15 closes or releases a valve seat 18 formed on the control module 13.
  • a return of the valve 15 by means of a helical spring formed as a return spring 14.
  • two returns 16 are provided in the control module 13, which provide a connection to a tank, not shown, of the vehicle.
  • the spring 14 is arranged in a recess formed in the throttle module 5, so that a very compact construction in the axial direction X-X of the injector 1 is possible.
  • the inlet throttle 6 is supplied with pressurized fuel via a fuel feed line 19 and an annular gap 17 formed between the injector body 2 and the throttle module 5.
  • the throttle module 5 Since the throttle module 5 is designed as a separate component, a seal must be formed between the throttle module 5 and the injector body 2. As shown in FIG. 1, the throttle module 5 is arranged in a stepped bore of the injector body, which consists of a first stage 11 and a second stage 12. In this embodiment, a sealing of the annular gap 17 in the axial direction X-X of the injector 1. This seal is provided by a first cutting edge 9 and a second cutting edge 10, which are formed on shoulders of the throttle module 5, corresponding to the steps 11, 12 of the stepped holes.
  • the throttle module 5 as a separate individual component, the bores for the inlet throttle 6 and the outlet throttle 7 can be executed quickly and easily with high accuracy.
  • the cutting edges 9, 10 provided on the throttle module 5 can be produced very inexpensively, for example by turning.
  • the function of the injector 1 is as follows. If an injection of fuel should take place, the valve 15 is actuated via an actuator (not shown) and moved in the direction of the nozzle needle 3, so that the valve 15 lifts from its valve seat 18. As a result, a connection between the control chamber 4 via the outlet throttle 7 and the open valve 15 to the return 16 is opened. As a result, the pressure in the control chamber 4 decreases, so that the nozzle needle 3 moves in the axial direction XX of the injector into the control chamber 4. As a result, the nozzle needle 3 lifts from its seat, so that at least one nozzle is released and an injection of fuel through the nozzle takes place in a combustion chamber of an internal combustion engine. In this case, the injection takes place as long as the valve 15 remains in its open state. The opening of the valve 15 takes place against the spring force of the spring 14th
  • valve 15 When the injection is to be ended, the valve 15 is actuated again via the actuator, so that it returns by returning the spring 14 back to its original position, in which the valve seat 18 is closed. As a result, the connection between the control chamber 4 and the return line 16 is interrupted again, so that the original pressure can build up in the control chamber 4, since pressurized fuel is supplied via the inlet throttle 6. As a result, the nozzle needle 3 moves back to its original position and closes the nozzle of the injector, so that the injection of fuel is completed.
  • the present invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • the injector comprises an injector body 2, a nozzle needle 3 and a control device 13 in order to control a pressure in a control chamber 4 for actuating the nozzle needle 3.
  • the injector 1 comprises an inlet throttle 6 and an outlet throttle 7, which are in fluid communication with the control chamber 4.
  • the inlet throttle 6 and the outlet throttle 7 are arranged in a throttle module 5 formed as a separate component.

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

Abstract

The invention relates to an injector for injecting fuel into a combustion chamber in an internal combustion engine. Said injector comprises an injector body (2), an injector needle (3) and a control device (13) in order to control pressure in a control chamber (4) for actuating the injector needle. The injector also comprises a supply throttle (6) and a discharge throttle (7) which are fluidically connected to the control chamber (4). The discharge throttle (7) and the supply throttle (6) are arranged in a throttle module (5) embodied as a separate component.

Description

Die vorliegende Erfindung betrifft einen Injektor zur Einspritzung von Kraftstoff in einen Brennraum einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine having the features of the preamble of claim 1.

Kraftstoffeinspritzinjektoren (DE 19936667 A1) sind beispielsweise für Common-Rail-Systeme in unterschiedlichen Ausgestaltungen bekannt. Ein herkömmlich aufgebauter Injektor umfasst eine Düsennadel, welche mittelbar über einen Steuerkolben oder unmittelbar mit einem Steuerraum in Verbindung steht, der mit Druck beaufschlagt wird. Wenn an der Düse und am Steuerraum der gleiche Druck herrscht, so wird durch das geometrisch vorgegebene Verhältnis der Flächen, an welchen der Druck angereift, eine resultierende Kraft erzeugt. Wenn beispielsweise die Fläche an der Düse kleiner als die Fläche am Steuerkolben ist, wird eine resultierende Kraft erzeugt, die die Düsennadel in ihren Sitz drückt und somit die Düse verschließt.Fuel injection injectors (DE 19936667 A1) are known, for example, for common rail systems in different configurations. A conventionally constructed injector comprises a nozzle needle, which communicates indirectly via a control piston or directly with a control chamber, which is pressurized. If the same pressure prevails at the nozzle and at the control chamber, a resulting force is generated by the geometrically predetermined ratio of the surfaces to which the pressure is applied. For example, if the area on the nozzle is smaller than the area on the control piston, a resultant force is created which forces the nozzle needle into its seat and thus closes the nozzle.

Der Steuerraum wird über eine sogenannte Zulaufdrossel mit einem Bereich hohen Druckes aus einem Speicher (Rail) verbunden, welcher gleichzeitig auch zur Düse geführt wird. Über eine sogenannte Ablaufdrossel steht der Steuerraum weiter mit einem Absteuerventil in Verbindung. Da die Ablaufdrossel einen größeren Strömungsquerschnitt als die Zulaufdrossel aufweist, sinkt der Druck im Steuerraum durch das Öffnen des Absteuerventils ab. Durch diese Druckabsenkung im Steuerraum ändert sich die resultierende Kraft an der Düsennadel, sodass die Düsennadel von ihrem Sitz abhebt und Kraftstoff durch die Spritzlochbohrungen in einen Brennraum der Brennkraftmaschine ausströmen kann. Bei den bisherigen Injektoren wurden der Steuerraum und die Zulaufdrossel bzw. die Ablaufdrossel jeweils in einen Injektorkörper eingebracht. Dadurch weist der Injektorkörper einen relativ komplizierten Aufbau auf und ist aus fertigungstechnischer Hinsicht relativ kompliziert herzustellen, da eine Vielzahl von Arbeitsgängen am Injektorkörper ausgeführt werden muss.The control chamber is connected via a so-called inlet throttle with a high pressure region from a memory (rail), which is also guided to the nozzle at the same time. Via a so-called outlet throttle, the control room is further connected to a shut-off valve. Since the outlet throttle has a larger flow cross-section than the inlet throttle, the pressure in the control chamber decreases by the opening of the shut-off valve. By this pressure reduction in the control chamber, the resulting force on the nozzle needle changes, so that the nozzle needle lifts from its seat and fuel can flow through the injection holes in a combustion chamber of the engine. In the previous injectors, the control chamber and the inlet throttle and the outlet throttle were each introduced into an injector body. As a result, the injector body has a relatively complicated structure and is To make relatively complicated from a manufacturing point of view, since a variety of operations must be performed on the injector body.

Es ist von daher Aufgabe der vorliegenden Erfindung, einen Injektor zur Einspritzung von Kraftstoff bereitzustellen, welcher insbesondere in einem Common-Rail-System verwendbar ist, einen einfachen Aufbau aufweist und kostengünstig herstellbar ist.It is therefore an object of the present invention to provide an injector for the injection of fuel, which is particularly useful in a common rail system, has a simple structure and is inexpensive to produce.

Diese Aufgabe wird durch einen Injektor mit den Merkmalen des Patentanspruchs 1 gelöst. Die Unteransprüche zeigen vorteilhafte Weiterbildungen der Erfindung.This object is achieved by an injector having the features of patent claim 1. The dependent claims show advantageous developments of the invention.

Der erfindungsgemäße Injektor ist derart aufgebaut, dass eine Zulaufdrossel und eine Ablaufdrossel in einem als separates Bauteil ausgebildeten Drosselmodul vorgesehen sind. Durch die Anordnung der beiden Drosseln in einem separaten Bauteil können fertigungstechnische Vorteile erzielt werden, da die Drosseln, welche mit einer besonders hohen Genauigkeit gefertigt werden müssen, in dem separaten Bauteil gut zugänglich eingebracht werden können. Anschließend erfolgt eine Montage des Drosselmoduls im Injektor.The injector according to the invention is constructed such that an inlet throttle and an outlet throttle are provided in a throttle module designed as a separate component. The arrangement of the two throttles in a separate component manufacturing advantages can be achieved because the chokes, which must be made with a very high accuracy, can be easily accessible introduced in the separate component. Subsequently, a mounting of the throttle module in the injector.

Weiter bevorzugt ist in dem separaten Drosselmodul auch ein Rückstellelement, z.B. eine Spiralfeder, zur Rückstellung der Steuereinrichtung des Injektors angeordnet. Dadurch kann der erfindungsgemäße Injektor kompakter aufgebaut sein.Further preferably, in the separate throttle module, a reset element, e.g. a coil spring arranged to return the control means of the injector. As a result, the injector according to the invention can be made more compact.

Weiter vorteilhaft ist in dem separaten Drosselmodul eine Aussparung gebildet, welche zumindest einen Teilbereich des Steuerraums des Injektors bereitstellt. Dadurch kann der erfindungsgemäße Injektor in Axialrichtung noch kompakter ausgebildet werden. Um einen noch kompakteren Injektor bereitzustellen, ist die Zulaufdrossel vorzugsweise in Radialrichtung zur Injektorachse angeordnet. Besonders bevorzugt wird der Zulaufdrossel dabei unter Druck stehender Kraftstoff über einen zwischen dem Injektorkörper und dem separaten Drosselmodul angeordneten Ringspalt zugeführt.Further advantageously, a recess is formed in the separate throttle module, which provides at least a portion of the control chamber of the injector. As a result, the injector according to the invention can be made even more compact in the axial direction. In order to provide an even more compact injector, the inlet throttle is preferably arranged in the radial direction to the injector axis. Particularly preferred is the Supply throttle while under pressure fuel supplied via an arranged between the injector body and the separate throttle module annular gap.

Um eine sichere Abdichtung des Ringspalts zwischen dem Injektorkörper und dem separaten Drosselmodul zu erreichen, ist der Ringspalt vorzugsweise in Axialrichtung abgedichtet. Besonders bevorzugt erfolgt die Abdichtung dabei mittels Schneidkanten, welche während der Montage eine plastische Verformung erfahren bzw. eine plastische Verformung an dem anderen Bauteil hervorrufen, sodass eine sichere Abdichtung ermöglicht wird.In order to achieve a secure sealing of the annular gap between the injector body and the separate throttle module, the annular gap is preferably sealed in the axial direction. Particularly preferably, the sealing takes place by means of cutting edges, which undergo a plastic deformation during assembly or cause a plastic deformation of the other component, so that a secure seal is made possible.

Besonders bevorzugt ist das Drosselmodul in einer Stufenbohrung des Injektorkörpers mit wenigstens zwei Stufen angeordnet. Dabei erfolgt eine Abdichtung des Ringspaltes in Axialrichtung an den Stufen der Stufenbohrung. Bei einer Abdichtung mittels Schneidkanten können dabei die Schneidkanten entweder im Drosselmodul oder an den Stufen im Injektorkörper ausgebildet sein.Particularly preferably, the throttle module is arranged in a stepped bore of the injector body with at least two stages. In this case, a sealing of the annular gap in the axial direction at the steps of the stepped bore. In the case of a seal by means of cutting edges, the cutting edges can be formed either in the throttle module or at the stages in the injector body.

Eine andere Möglichkeit der Abdichtung des Ringspaltes zwischen dem Injektorkörper und dem Drosselmodul ist eine Abdichtung in Radialrichtung des Injektors. Die radiale Abdichtung kann dabei beispielsweise mittels einer elastischen Ringdichtung oder einer Presspassung erfolgen.Another possibility of sealing the annular gap between the injector body and the throttle module is a seal in the radial direction of the injector. The radial seal can be done for example by means of an elastic ring seal or a press fit.

Es sei weiterhin angemerkt, dass es selbstverständlich auch möglich ist, eine Abdichtung zwischen dem Injektorkörper und dem separaten Drosselmodul sowohl in Axialrichtung als auch in Radialrichtung vorzusehen.It should also be noted that it is of course also possible to provide a seal between the injector body and the separate throttle module both in the axial direction and in the radial direction.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung beschrieben.The invention will be described with reference to a preferred embodiment in conjunction with the drawings.

Die einzige Figur zeigt eine schematische Schnittdarstellung eines Bereichs eines Injektors mit einem erfindungsgemäßen Drosselmodul.The single figure shows a schematic sectional view of a portion of an injector with a throttle module according to the invention.

Wie in Figur 1 gezeigt, umfasst der Injektor 1 einen Injektorkörper 2, in welchem ein Drosselmodul 5 und ein Steuermodul 13 angeordnet sind. Weiterhin ist im Injektorkörper 2 eine Düsennadel 3 angeordnet und in Axialrichtung X-X des Injektors im Injektorkörper 2 geführt. Das Drosselmodul 5 ist als separates Bauteil ausgebildet. Im Drosselmodul 5 ist eine Zulaufdrossel 6 und eine Ablaufdrossel 7 ausgebildet. Weiterhin ist an dem zur Düsennadel 3 gerichteten Ende des Drosselmoduls 5 eine im Schnitt U-förmige Aussparung 8 gebildet. Diese Aussparung 8 stellt einen Steuerraum 4 zwischen dem Drosselmodul 5 und der Düsennadel 3 bereit. Das Steuermodul 13 umfasst ein Ventil 15, welches über eine nicht dargestellte Steuereinheit wie beispielsweise ein Magnetelement oder ein Piezoaktor betätigbar ist. Das Ventil 15 verschließt bzw. gibt einen am Steuermodul 13 gebildeten Ventilsitz 18 frei. Eine Rückstellung des Ventils 15 erfolgt mittels einer als Spiralfeder ausgebildeten Rückstellfeder 14. Weiterhin sind im Steuermodul 13 zwei Rückläufe 16 vorgesehen, welche eine Verbindung zu einem nicht gezeigten Tank des Fahrzeugs bereitstellen.As shown in FIG. 1, the injector 1 comprises an injector body 2, in which a throttle module 5 and a control module 13 are arranged. Furthermore, a nozzle needle 3 is arranged in the injector body 2 and guided in the axial direction X-X of the injector in the injector body 2. The throttle module 5 is formed as a separate component. In the throttle module 5, an inlet throttle 6 and an outlet throttle 7 is formed. Furthermore, a section U-shaped recess 8 is formed at the end directed toward the nozzle needle 3 of the throttle module 5. This recess 8 provides a control chamber 4 between the throttle module 5 and the nozzle needle 3 ready. The control module 13 comprises a valve 15, which can be actuated via a control unit, not shown, such as a magnetic element or a piezoelectric actuator. The valve 15 closes or releases a valve seat 18 formed on the control module 13. A return of the valve 15 by means of a helical spring formed as a return spring 14. Furthermore, two returns 16 are provided in the control module 13, which provide a connection to a tank, not shown, of the vehicle.

Wie weiter aus Figur 1 ersichtlich ist, ist die Feder 14 in einer im Drosselmodul 5 gebildeten Aussparung angeordnet, sodass eine sehr kompakte Bauweise in Axialrichtung X-X des Injektors 1 möglich ist.As can be seen further from FIG. 1, the spring 14 is arranged in a recess formed in the throttle module 5, so that a very compact construction in the axial direction X-X of the injector 1 is possible.

Wie weiterhin aus Figur 1 ersichtlich ist, wird der Zulaufdrossel 6 unter Druck stehender Kraftstoff über eine Kraftstoffzuleitung 19 und einen zwischen dem Injektorkörper 2 und dem Drosselmodul 5 gebildeten Ringspalt 17 zugeführt.1, the inlet throttle 6 is supplied with pressurized fuel via a fuel feed line 19 and an annular gap 17 formed between the injector body 2 and the throttle module 5.

Da das Drosselmodul 5 als ein separates Bauteil ausgebildet ist, muss zwischen dem Drosselmodul 5 und dem Injektorkörper 2 eine Abdichtung ausgebildet werden. Wie in Figur 1 gezeigt, ist das Drosselmodul 5 in einer Stufenbohrung des Injektorkörpers angeordnet, welche aus einer ersten Stufe 11 und einer zweiten Stufe 12 besteht. Bei diesem Ausführungsbeispiel erfolgt eine Abdichtung des Ringspaltes 17 in Axialrichtung X-X des Injektors 1. Diese Abdichtung wird durch eine erste Schneidkante 9 und eine zweite Schneidkante 10 bereitgestellt, welche an Absätzen des Drosselmoduls 5 ausgebildet sind, die den Stufen 11, 12 der Stufenbohrungen entsprechen.Since the throttle module 5 is designed as a separate component, a seal must be formed between the throttle module 5 and the injector body 2. As shown in FIG. 1, the throttle module 5 is arranged in a stepped bore of the injector body, which consists of a first stage 11 and a second stage 12. In this embodiment, a sealing of the annular gap 17 in the axial direction X-X of the injector 1. This seal is provided by a first cutting edge 9 and a second cutting edge 10, which are formed on shoulders of the throttle module 5, corresponding to the steps 11, 12 of the stepped holes.

Bei der Montage des Drosselmoduls 5 in den Injektorkörper 2 erfolgt eine plastische Verformung der Schneidkanten 9 und 10 an den Stufen 11 und 12 der Stufenbohrung. Dadurch passen sich die Oberflächen der beiden Bauteile 2 und 5 ideal aneinander an, wodurch eine sehr gute Dichtwirkung erreicht wird. Diese Dichtwirkung ist auch bei sehr hohen Drücken, wie sie beispielsweise bei Common-Rail-Einspritzsystemen auftreten, dicht. Weiterhin können durch das Vorsehen der sich plastisch verformenden Schneidkanten 9 und 10 durch die Fertigung bedingte Längenunterschiede zwischen den Abständen der Stufen 11, 12 der Stufenbohrung und/oder den Abständen der am Drosselmodul 5 zwischen den Schneidkanten 9 und 10 gebildeten Absätzen ausgeglichen werden. Dadurch ist es möglich, dass die Fertigungstoleranzen in einem weiteren Bereich gewählt werden können, sodass die Herstellung des Injektors verbilligt werden kann. Weiterhin können durch das Vorsehen des Drosselmoduls 5 als separates Einzelbauteil die Bohrungen für die Zulaufdrossel 6 und die Ablaufdrossel 7 schnell und einfach bei hoher Genauigkeit ausgeführt werden. Ebenso können die an dem Drosselmodul 5 vorgesehenen Schneidkanten 9, 10 sehr kostengünstig, beispielsweise durch Drehen, erzeugt werden.When mounting the throttle module 5 in the injector body 2, a plastic deformation of the cutting edges 9 and 10 takes place at the steps 11 and 12 of the stepped bore. As a result, the surfaces of the two components 2 and 5 ideally adapt to each other, whereby a very good sealing effect is achieved. This sealing effect is also at very high pressures, such as occur in common-rail injection systems, tight. Furthermore, by providing the plastically deforming cutting edges 9 and 10 caused by the manufacturing differences in length between the intervals of the stages 11, 12 of the stepped bore and / or the distances of the throttle module 5 formed between the cutting edges 9 and 10 paragraphs. This makes it possible that the manufacturing tolerances can be selected in a wider range, so that the production of the injector can be made cheaper. Furthermore, by providing the throttle module 5 as a separate individual component, the bores for the inlet throttle 6 and the outlet throttle 7 can be executed quickly and easily with high accuracy. Likewise, the cutting edges 9, 10 provided on the throttle module 5 can be produced very inexpensively, for example by turning.

Die Funktion des erfindungsgemäßen Injektors 1 ist dabei wie folgt. Wenn eine Einspritzung von Kraftstoff erfolgen soll, wird das Ventil 15 über einen Aktor (nicht dargestellt) betätigt und in Richtung der Düsennadel 3 bewegt, sodass sich das Ventil 15 von seinem Ventilsitz 18 abhebt. Dadurch wird eine Verbindung zwischen dem Steuerraum 4 über die Ablaufdrossel 7 und das offene Ventil 15 zum Rücklauf 16 geöffnet. Dadurch sinkt der Druck im Steuerraum 4, sodass sich die Düsennadel 3 in Axialrichtung X-X des Injektors in den Steuerraum 4 bewegt. Dadurch hebt die Düsennadel 3 von ihrem Sitz ab, sodass wenigstens eine Düse freigegeben wird und eine Einspritzung von Kraftstoff durch die Düse in einen Brennraum einer Brennkraftmaschine erfolgt. Hierbei erfolgt die Einspritzung solange, solange das Ventil 15 in seinem geöffneten Zustand verbleibt. Die Öffnung des Ventils 15 erfolgt dabei entgegen der Federkraft der Feder 14.The function of the injector 1 according to the invention is as follows. If an injection of fuel should take place, the valve 15 is actuated via an actuator (not shown) and moved in the direction of the nozzle needle 3, so that the valve 15 lifts from its valve seat 18. As a result, a connection between the control chamber 4 via the outlet throttle 7 and the open valve 15 to the return 16 is opened. As a result, the pressure in the control chamber 4 decreases, so that the nozzle needle 3 moves in the axial direction XX of the injector into the control chamber 4. As a result, the nozzle needle 3 lifts from its seat, so that at least one nozzle is released and an injection of fuel through the nozzle takes place in a combustion chamber of an internal combustion engine. In this case, the injection takes place as long as the valve 15 remains in its open state. The opening of the valve 15 takes place against the spring force of the spring 14th

Wenn die Einspritzung beendet werden soll, wird das Ventil 15 wieder über den Aktor betätigt, sodass es durch Rückstellung der Feder 14 wieder in seine Ausgangsposition zurückkehrt, in welcher der Ventilsitz 18 verschlossen ist. Dadurch wird die Verbindung zwischen dem Steuerraum 4 und der Rücklaufleitung 16 wieder unterbrochen, sodass sich im Steuerraum 4 der ursprüngliche Druck aufbauen kann, da unter Druck stehender Kraftstoff über die Zulaufdrossel 6 zugeführt wird. Dadurch bewegt sich die Düsennadel 3 wieder in ihre Ausgangsposition und verschließt die Düse des Injektors, sodass die Einspritzung von Kraftstoff beendet ist.When the injection is to be ended, the valve 15 is actuated again via the actuator, so that it returns by returning the spring 14 back to its original position, in which the valve seat 18 is closed. As a result, the connection between the control chamber 4 and the return line 16 is interrupted again, so that the original pressure can build up in the control chamber 4, since pressurized fuel is supplied via the inlet throttle 6. As a result, the nozzle needle 3 moves back to its original position and closes the nozzle of the injector, so that the injection of fuel is completed.

Während der Betätigung des Steuerventils 15 bzw. der Düsennadel 3 kann dabei eine stetige sichere Abdichtung des Ringspalts 17 zwischen dem Injektormodul 2 und dem Drosselmodul 5 an den Stufen 11 bzw. 12 des Injektorkörpers 2 sichergestellt werden. Es sei angemerkt, dass die Schneidkanten 9, 10 selbstverständlich nicht nur im Drosselmodul 5 vorgesehen werden, sondern dass in gleicher Weise auch Schneidkanten an den Stufen 11, 12 des Injektorkörpers vorgesehen werden können, welche bei Montage des Drosselmoduls 5 plastisch verformt werden und so eine Dichtung zwischen dem Injektorkörper 2 und dem Drosselmodul 5 herstellen.During the actuation of the control valve 15 or the nozzle needle 3, a steady, secure sealing of the annular gap 17 between the injector module 2 and the throttle module 5 at the steps 11 or 12 of the injector body 2 can be ensured. It should be noted that the cutting edges 9, 10 are of course not only provided in the throttle module 5, but that in the same way also cutting edges on the stages 11, 12 of the injector body can be provided, which plastically deformed during assembly of the throttle module 5 and thus produce a seal between the injector body 2 and the throttle module 5.

Somit betrifft die vorliegende Erfindung einen Injektor zur Einspritzung von Kraftstoff in einen Brennraum einer Brennkraftmaschine. Der Injektor umfasst einen Injektorkörper 2, einer Düsennadel 3 und eine Steuereinrichtung 13, um einen Druck in einem Steuerraum 4 zur Betätigung der Düsennadel 3 zu steuern. Weiterhin umfasst der Injektor 1 eine Zulaufdrossel 6 und eine Ablaufdrossel 7, welche mit dem Steuerraum 4 in Fluidverbindung stehen. Die Zulaufdrossel 6 und die Ablaufdrossel 7 sind dabei in einem als separates Bauteil gebildeten Drosselmodul 5 angeordnet.Thus, the present invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine. The injector comprises an injector body 2, a nozzle needle 3 and a control device 13 in order to control a pressure in a control chamber 4 for actuating the nozzle needle 3. Furthermore, the injector 1 comprises an inlet throttle 6 and an outlet throttle 7, which are in fluid communication with the control chamber 4. The inlet throttle 6 and the outlet throttle 7 are arranged in a throttle module 5 formed as a separate component.

Die vorhergehende Beschreibung des Ausführungsbeispiels gemäß der vorliegenden Erfindung dient nur zu illustrativen Zwecken und nicht zum Zwecke der Beschränkung der Erfindung. Im Rahmen der Erfindung sind verschiedene Änderungen und Modifikationen möglich, ohne den Umfang der Erfindung sowie ihrer Äquivalente zu verlassen.The foregoing description of the embodiment according to the present invention is for illustrative purposes only and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents.

Claims (6)

  1. Injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising an injector body (2), a nozzle needle (3), a control device (15) in order to control a pressure in a control chamber (4) for actuating the nozzle needle (3), a fill port (6) and a spill port (7) both of which are fluidically connected to the control chamber (4), with the fill port (6) and the spill port (7) being disposed in a port module (5) embodied as a separate component, with an annular gap (17) being embodied between the injector body (2) and the port module (5) via which fuel is fed to the fill port (6), with the annular gap (17) being sealed in the axial direction (X-X) of the injector, with the port module (5) being disposed in a stepped bore having at least two steps (11, 12) of the injector body (2), with the annular gap (17) being sealed in the axial direction at the steps (11, 12) of the stepped bore, characterized in that the seal is achieved by means of cutting edges (9, 10).
  2. Injector according to claim 1, characterized in that there is disposed in the porting module (5) a resetting element (14) for resetting the control device (15).
  3. Injector according to one of the preceding claims, characterized in that there is formed in the porting module (5) a recess (8) which provides at least a sub-region of the control chamber (4).
  4. Injector according to one of the preceding claims, characterized in that the fill port (6) is disposed in the radial direction of the injector.
  5. Injector according to one of the preceding claims, characterized in that the annular gap (17) is sealed in the radial direction of the injector.
  6. Injector according to claim 5, characterized in that the sealing is performed by an elastic seal and/or a press fit between the porting module (5) and the injector body (2).
EP03735282A 2002-05-10 2003-05-06 Injector for fuel injection Expired - Lifetime EP1504187B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002120931 DE10220931C1 (en) 2002-05-10 2002-05-10 Injector for fuel injection
DE10220931 2002-05-10
PCT/DE2003/001448 WO2003095825A1 (en) 2002-05-10 2003-05-06 Injector for fuel injection

Publications (2)

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EP1504187A1 EP1504187A1 (en) 2005-02-09
EP1504187B1 true EP1504187B1 (en) 2007-02-28

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EP (1) EP1504187B1 (en)
JP (1) JP2005529267A (en)
DE (2) DE10220931C1 (en)
WO (1) WO2003095825A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE487057T1 (en) 2004-02-25 2010-11-15 Ganser Hydromag FUEL INJECTION VALVE FOR COMBUSTION ENGINES
DE102008044741B4 (en) 2008-08-28 2010-10-14 Continental Automotive Gmbh Method and control device for controlling an injector
DE102009007213B4 (en) 2009-02-03 2017-06-14 Continental Automotive Gmbh Injector assembly for an injection valve
JP6686931B2 (en) * 2017-02-22 2020-04-22 株式会社デンソー Fuel injector
DE102018204492A1 (en) * 2018-03-23 2019-09-26 Robert Bosch Gmbh fuel injector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807757A1 (en) * 1994-06-06 1997-11-19 Ganser-Hydromag Ag Fuel injection valve for internal combustion engines
IT1293434B1 (en) * 1997-07-11 1999-03-01 Elasis Sistema Ricerca Fiat SEALING DEVICE BETWEEN TWO COMPARTMENTS SUBJECT TO DIFFERENT PRESSURES, FOR EXAMPLE IN A FUEL INJECTOR FOR COMUSTION ENGINES
DE19819666A1 (en) * 1998-05-02 1999-11-04 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
WO2000006892A2 (en) * 1998-07-31 2000-02-10 Siemens Aktiengesellschaft Fuel injector for internal combustion engines
DE19936668A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
DE19936667A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
DE19937677C2 (en) * 1999-08-10 2003-06-26 Siemens Ag Injector with improved sealing surface arrangement

Also Published As

Publication number Publication date
EP1504187A1 (en) 2005-02-09
DE10220931C1 (en) 2003-11-27
JP2005529267A (en) 2005-09-29
WO2003095825A1 (en) 2003-11-20
DE50306665D1 (en) 2007-04-12

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