EP2275667A1 - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- EP2275667A1 EP2275667A1 EP10162914A EP10162914A EP2275667A1 EP 2275667 A1 EP2275667 A1 EP 2275667A1 EP 10162914 A EP10162914 A EP 10162914A EP 10162914 A EP10162914 A EP 10162914A EP 2275667 A1 EP2275667 A1 EP 2275667A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- chamber
- fuel injection
- control
- pressure
- 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.)
- Granted
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Classifications
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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
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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
- 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
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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
- 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
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0073—Pressure balanced valves
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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
- 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
- F02M61/042—The valves being provided with fuel passages
Definitions
- the invention relates to a fuel injection valve for internal combustion engines for injecting fuel under high pressure, with a nozzle needle which cooperates by its longitudinal movement with a valve seat and thereby at least one injection opening opens and closes, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of the valve seat directed closing force, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which comprises a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber and closes.
- Fuel injection valves as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known.
- compressed fuel is made available in a so-called rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine.
- the injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings.
- the object of the invention is to provide a fuel injection valve according to the preamble of claim 1, which is simple in construction and inexpensive to produce.
- the object is in a fuel injection valve for internal combustion engines for injecting fuel under high pressure, with a nozzle needle, which cooperates by their longitudinal movement with a valve seat and thereby opens and closes at least one injection port, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of Valve seat directed closing force undergoes, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which comprises a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber, thereby in that the control valve member has a guide section with which the control valve member is guided longitudinally movably outside the control valve chamber and from which the control valve member extends into the control valve chamber.
- control valve space a space within the fuel injection valve is referred to, which is acted upon by a control valve chamber pressure, which is also referred to as control pressure.
- control valve chamber pressure which is also referred to as control pressure.
- the control valve chamber can be made significantly smaller than in an embodiment in which the control valve member is guided in a sealing sleeve which is arranged in the control valve chamber.
- the hydraulic sealing assistance may vary depending on the pressure with which the fuel is injected from the fuel injection valve, which is also referred to as rail pressure.
- a preferred embodiment of the fuel injection valve is characterized in that the control valve member has a shoulder, which is acted upon by the control valve chamber pressure, that a hydraulic closing force is applied to the control valve member.
- Another preferred embodiment of the fuel injection valve is characterized in that a control valve spring is biased against the shoulder.
- the control valve spring By the control valve spring, the control valve member is in its closed position biased, in which the connection of the control valve chamber is interrupted or closed with the leakage oil space.
- control valve member has a shoulder facing away from the sealing body, which cooperates with a control valve seat to open the connection of the control valve chamber with the leakage oil space and close.
- a sealing edge or sealing surface is formed, which can come into sealing contact with a sealing surface or sealing edge to represent the valve seat.
- a further preferred embodiment of the fuel injection valve is characterized in that the sealing body can be acted upon or acted upon by an actuator, by means of which the control valve can be actuated.
- the actuator is, for example, a piezoelectric actuator or a magnetic actuator.
- a further preferred exemplary embodiment of the fuel injection valve is characterized in that the area of the sealing body acted upon in the closed state of the control valve member against the closing direction is less than or equal to the area of the shoulder which is acted upon in the closing direction by the control valve chamber pressure. If the areas are equal, then the control valve member is pressure balanced. If, in the closed state of the control valve member, the surface of the sealing body acted upon by the control valve chamber pressure against the closing direction is smaller than the area of the shoulder acted upon in the closing direction by the control valve chamber pressure, then a hydraulic closing force acts on the control valve member.
- a further preferred embodiment of the fuel injection valve is characterized in that the control valve member is guided with the guide portion in a throttle plate.
- the throttle plate has substantially the shape of a circular disk with a plurality of through holes and / or blind holes.
- a further preferred embodiment of the fuel injection valve is characterized in that the throttle plate comprises a blind hole in which the control valve member is guided with the guide portion and in which a leak oil channel opens.
- the blind hole is preferably designed as a longitudinal bore in the throttle plate.
- the opening into the blind hole return channel or leakage channel is preferably designed as a transverse bore and allows for a movement of the control valve member into the blind hole in a pressure reduction in the blind hole.
- a further preferred embodiment of the fuel injection valve is characterized in that the throttle plate comprises a drain channel which connects the nozzle needle control chamber with the control valve chamber.
- the drainage channel is preferably provided with an outlet throttle.
- the throttle plate further comprises an inlet channel with an inlet throttle, via which the nozzle needle control chamber is filled with fuel from a central high-pressure fuel storage or a central high-pressure fuel source.
- control valve space is recessed in a valve plate which is mounted on the throttle plate.
- the two plates which may also be embodied as bodies or disks, are attached to one another such that the blind hole for guiding the control valve member opens into the control valve chamber.
- the guided in the throttle plate control valve member projects with the sealing body in the control valve chamber of the valve plate, which also has the control valve seat.
- FIGS. 1 and 2 show a fuel injection valve 1 according to the invention in longitudinal section.
- the fuel injection valve 1 has a holding body 2, a valve body or a valve plate 4, a throttle plate or throttle plate 6, and a nozzle body 8 abutting each other in this order.
- the components are pressed against each other by a clamping nut 9, which is supported on a shoulder of the nozzle body 8 and is held by a thread on the holding body 2.
- a pressure chamber 14 is formed, in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable.
- the nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 11, with which it cooperates with a valve seat or nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14.
- nozzle seat 13 From the nozzle seat 13 go from one or more injection ports 12, which open in installation position of the fuel injection valve 1 directly into a combustion chamber of an internal combustion engine.
- the nozzle needle 10 is guided in a middle section in the pressure chamber 14, wherein the fuel is passed through a plurality of bevels 15 to the injection openings 12.
- the nozzle needle 10 is guided at its end remote from the valve seat in a sleeve 22, wherein the sleeve 22 by a closing spring 18, which surrounds the nozzle needle 10 and the sleeve 22 is supported on a shoulder 16, pressed against the throttle plate 6.
- a nozzle needle control chamber 20 is limited, which is filled with fuel, so that by the pressure in the nozzle needle control chamber 20, a hydraulic force is exerted on the valve seat facing away from the end of the nozzle needle 10 and a force in the direction of the nozzle seat 13 on the nozzle needle 10 exerts.
- an inlet channel 25 is formed, is passed through the compressed fuel under high pressure from a high-pressure fuel source in the pressure chamber 14.
- An inlet channel or high-pressure channel 25 comprising a plurality of sections 24, 25, 26 is connected to the control chamber 20 via an inlet channel 39 extending in the throttle plate 6 connected to an inlet throttle 40.
- a control valve 30 is provided in the valve body 4, wherein the control valve 30 has a control valve chamber 31 which is formed as a cavity in the valve body 4.
- the control valve chamber 31 is connected to the nozzle needle control chamber 20 in the nozzle body 6 via a drain channel with an outlet throttle 42, which is formed in the throttle plate 6.
- a control valve member 34 which is designed as a valve pin or valve piston 45.
- the valve pin 45 has at its end close to the combustion chamber a guide portion 44, with which the valve pin 45 and the control valve member 34 is guided back and forth movable in a blind hole 46 of the throttle plate 6.
- a leakage oil channel 49 opens into the blind hole 46.
- the leakage oil channel 49 which is also referred to as a return channel, communicates with a pressure relief space, which is acted upon, for example, by ambient pressure.
- the control valve member 34 includes a central blind hole 50 which extends from the combustion chamber near the end of the valve pin 45 to a sealing body 52 which is formed at the combustion chamber remote end of the control valve member 34.
- the sealing body 52 is provided with a sealing surface or sealing edge which cooperates with a sealing edge or sealing surface on the valve body 4 to represent a control valve seat 54.
- the control valve seat 54 When the sealing body 52 is tight against the valve body, the control valve seat 54 is closed. When the sealing body 52 lifts from the valve body 4, that is, when the control valve member 34 with the sealing body 52 from his in FIG. 1 shown closed position downwards, ie to the nozzle needle 10, moves, then the control valve seat 54 is opened and released a connection from the control valve chamber 31 into a leakage oil chamber 55.
- the leakage oil chamber 55 which is also referred to as the return chamber, is like the drain channel or return channel 41 with the pressure relief chamber in connection.
- the control valve member 34 is actuated by an actuator 60, which is designed for example as a piezoelectric actuator. At the combustion chamber near the end of the actuator 60, a nose 61 is formed, which rests with its free end on the sealing body 52 and can be brought to bear.
- the control valve member 34 further includes a collar 64 which is integrally connected on its side facing away from the combustion chamber with the sealing body 52.
- the sealing body 52 may alternatively be designed as a separate component.
- the collar 64 On its side facing the combustion chamber, the collar 64 forms a shoulder 65, against which a valve spring 68 abuts and which is acted upon by the control valve chamber pressure.
- the valve spring 68 is clamped in an annular space in the axial direction between the shoulder 65 and the throttle plate 6 and preferably designed as a helical compression spring.
- the fuel injection device 1 is supplied via the inlet channel 24 to 26 with high-pressure fuel.
- This high pressure is also referred to as rail pressure.
- the rail pressure enters the nozzle needle control chamber 20 via the inlet channel 39 with the inlet throttle 40.
- the rail pressure reaches the control valve chamber 31 via the outlet channel 41 with the outlet throttle 42.
- the control valve member 34 may be designed to be balanced. In a force-balanced control valve member 34 which is opposite to the closing direction, that is in FIG. 1 down, acted upon by the Steuerventilraumtik surface of the sealing body 52 as large as that in the closing direction, ie in FIG. 1 To achieve pressure support during closing, the surfaces must be adapted accordingly, that is, the pressurized surface of the shoulder 65 must be made larger than the pressurized surface of the sealing body 52.
- the actuator 60 which is preferably embodied as a piezoactuator, it expands, so that the control valve member 34 moves downwards with the sealing body 52.
- the connection between the control valve chamber 31 and the leakage oil chamber or return chamber 55 is released via the control valve seat 54.
- the pressure in the control valve chamber 31 and via the drainage channel 41 with the outlet throttle 42 is also lower in the nozzle needle control chamber 20, as a result of which the nozzle needle 10 moves out of its nozzle seat 13.
- an injection of fuel from the pressure chamber 14 through the injection holes or injection openings 12 is triggered.
- control valve member 34 is closed by the biasing force of the valve spring 68 and optionally by a resulting from a set area ratio hydraulic closing force, so that the control valve chamber 31 via the drain passage 41 with the outlet throttle 42 with Fuel from the nozzle needle control chamber 20 is filled. Due to the increasing pressure in the nozzle needle control chamber 20, the nozzle needle closes.
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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
Description
Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen zum Einspritzen von Kraftstoff unter hohem Druck, mit einer Düsennadel, die durch ihre Längsbewegung mit einem Ventilsitz zusammenwirkt und dadurch wenigsten eine Einspritzöffnung öffnet und schließt, wobei die Düsennadel durch den Druck in einem Düsennadelsteuerraum eine in Richtung des Ventilsitzes gerichtete Schließkraft erfährt, und mit einem Steuerventil, durch welches der Druck in dem Düsennadelsteuerraum einstellbar ist und das einen Steuerventilraum umfasst, in welchem ein Steuerventilglied längsbewegbar angeordnet ist und durch seine Längsbewegung eine Verbindung des Steuerventilraums mit einem Leckölraum öffnet und schließt.The invention relates to a fuel injection valve for internal combustion engines for injecting fuel under high pressure, with a nozzle needle which cooperates by its longitudinal movement with a valve seat and thereby at least one injection opening opens and closes, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of the valve seat directed closing force, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which comprises a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber and closes.
Kraftstoffeinspritzventile, wie sie vorzugsweise zur Kraftstoffeinspritzung direkt in den Brennraum einer Brennkraftmaschine verwendet werden, sind bekannt. Bei Einspritzsystemen, die nach dem so genannten Common-Rail-Prinzip arbeiten, wird mittels einer Hochdruckpumpe verdichteter Kraftstoff in einem so genannten Rail zur Verfügung gestellt und mittels Injektoren in die jeweiligen Brennräume einer Brennkraftmaschine eingespritzt. Die Einspritzung wird mittels einer Düsennadel angesteuert, die eine Längsbewegung ausführt und dadurch eine oder mehrere Einspritzöffnungen öffnet und schließt.Fuel injection valves, as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known. In injection systems which operate according to the so-called common rail principle, compressed fuel is made available in a so-called rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine. The injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings.
Aufgabe der Erfindung ist es, ein Kraftstoffeinspritzventil gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, das einfach aufgebaut und kostengünstig herstellbar ist.The object of the invention is to provide a fuel injection valve according to the preamble of claim 1, which is simple in construction and inexpensive to produce.
Die Aufgabe ist bei einem Kraftstoffeinspritzventil für Brennkraftmaschinen zum Einspritzen von Kraftstoff unter hohem Druck, mit einer Düsennadel, die durch ihre Längsbewegung mit einem Ventilsitz zusammenwirkt und dadurch wenigstens eine Einspritzöffnung öffnet und schließt, wobei die Düsennadel durch den Druck in einem Düsennadelsteuerraum eine in Richtung des Ventilsitzes gerichtete Schließkraft erfährt, und mit einem Steuerventil, durch welches der Druck in dem Düsennadelsteuerraum einstellbar ist und das einen Steuerventilraum umfasst, in welchem ein Steuerventilglied längsbewegbar angeordnet ist und durch seine Längsbewegung eine Verbindung des Steuerventilraums mit einem Leckölraum öffnet und schließt, dadurch gelöst, dass das Steuerventilglied einen Führungsabschnitt aufweist, mit dem das Steuerventilglied außerhalb des Steuerventilraums längsbewegbar geführt ist und von dem sich das Steuerventilglied in den Steuerventilraum hinein erstreckt. Als Steuerventilraum wird ein Raum innerhalb des Kraftstoffeinspritzventils bezeichnet, der mit einem Steuerventilraumdruck beaufschlagt ist, der auch als Steuerdruck bezeichnet wird. Durch die Führung des Steuerventilglieds außerhalb des Steuerventilraums kann der Steuerventilraum deutlich kleiner ausgeführt werden als bei einer Ausführung, in der das Steuerventilglied in einer Dichthülse geführt ist, die in dem Steuerventilraum angeordnet ist. Darüber hinaus ist es bei dieser Art der Führung des Steuerventilglieds auf einfache Art und Weise möglich, eine hydraulische Dichtunterstützung auf das Steuerventilglied aufzubringen. Die hydraulische Dichtunterstützung kann in Abhängigkeit von dem Druck variieren, mit welchem der Kraftstoff aus dem Kraftstoffeinspritzventil eingespritzt wird und der auch als Raildruck bezeichnet wird.The object is in a fuel injection valve for internal combustion engines for injecting fuel under high pressure, with a nozzle needle, which cooperates by their longitudinal movement with a valve seat and thereby opens and closes at least one injection port, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of Valve seat directed closing force undergoes, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which comprises a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber, thereby in that the control valve member has a guide section with which the control valve member is guided longitudinally movably outside the control valve chamber and from which the control valve member extends into the control valve chamber. As a control valve space, a space within the fuel injection valve is referred to, which is acted upon by a control valve chamber pressure, which is also referred to as control pressure. By the control of the control valve member outside the control valve chamber, the control valve chamber can be made significantly smaller than in an embodiment in which the control valve member is guided in a sealing sleeve which is arranged in the control valve chamber. Moreover, with this type of guidance of the control valve member, it is possible in a simple manner to apply a hydraulic sealing assistance to the control valve member. The hydraulic sealing assistance may vary depending on the pressure with which the fuel is injected from the fuel injection valve, which is also referred to as rail pressure.
Ein bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass das Steuerventilglied eine Schulter aufweist, die so mit dem Steuerventilraumdruck beaufschlagt ist, dass eine hydraulische Schließkraft auf das Steuerventilglied aufgebracht wird. Das liefert den Vorteil, dass eine zum Schließen des Steuerventilsglieds verwendete Steuerventilfeder kleiner ausgelegt werden kann als bei herkömmlichen Kraftstoffeinspritzventilen. Dadurch kann die Größe des Steuerventilraums weiter reduziert werden.A preferred embodiment of the fuel injection valve is characterized in that the control valve member has a shoulder, which is acted upon by the control valve chamber pressure, that a hydraulic closing force is applied to the control valve member. This provides the advantage that a control valve spring used to close the control valve member can be made smaller than in conventional fuel injection valves. As a result, the size of the control valve space can be further reduced.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass eine Steuerventilfeder gegen die Schulter vorgespannt ist. Durch die Steuerventilfeder ist das Steuerventilglied in seine Schließstellung vorgespannt, in welcher die Verbindung des Steuerventilraums mit dem Leckölraum unterbrochen oder geschlossen ist.Another preferred embodiment of the fuel injection valve is characterized in that a control valve spring is biased against the shoulder. By the control valve spring, the control valve member is in its closed position biased, in which the connection of the control valve chamber is interrupted or closed with the leakage oil space.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass das Steuerventilglied einen der Schulter abgewandten Dichtkörper aufweist, der mit einem Steuerventilsitz zusammenwirkt, um die Verbindung des Steuerventilraums mit dem Leckölraum zu öffnen und zu schließen. An dem Dichtkörper ist eine Dichtkante oder Dichtfläche ausgebildet, die dichtend an einer Dichtfläche oder Dichtkante zur Anlage kommen kann, um den Ventilsitz darzustellen.Another preferred embodiment of the fuel injection valve is characterized in that the control valve member has a shoulder facing away from the sealing body, which cooperates with a control valve seat to open the connection of the control valve chamber with the leakage oil space and close. At the sealing body, a sealing edge or sealing surface is formed, which can come into sealing contact with a sealing surface or sealing edge to represent the valve seat.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass der Dichtkörper durch einen Aktor beaufschlagbar beziehungsweise beaufschlagt ist, durch den das Steuerventil betätigbar ist. Bei dem Aktor handelt es sich zum Beispiel um einen Piezoaktor oder einen Magnetaktor. Durch den Aktor wird zum Öffnen des Steuerventils eine Kraft auf das Steuerventilglied beziehungsweise auf den Dichtkörper des Steuerventilglieds aufgebracht, die der von der Steuerventilfeder erzeugten Schließkraft und/oder der hydraulischen Schließkraft auf das Steuerventilglied entgegenwirkt.A further preferred embodiment of the fuel injection valve is characterized in that the sealing body can be acted upon or acted upon by an actuator, by means of which the control valve can be actuated. The actuator is, for example, a piezoelectric actuator or a magnetic actuator. By the actuator, a force is applied to the control valve member or to the sealing body of the control valve member to open the control valve, which counteracts the closing force generated by the control valve spring and / or the hydraulic closing force on the control valve member.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass die im geschlossenen Zustand des Steuerventilglieds entgegen der Schließrichtung mit dem Steuerventilraumdruck beaufschlagte Fläche des Dichtkörpers kleiner als die oder gleich der Fläche der Schulter ist, die in Schließrichtung mit dem Steuerventilraumdruck beaufschlagt ist. Wenn die Flächen gleich groß sind, dann ist das Steuerventilglied druckausgeglichen. Wenn die im geschlossenen Zustand des Steuerventilglieds entgegen der Schließrichtung mit dem Steuerventilraumdruck beaufschlagte Fläche des Dichtkörpers kleiner als die in Schließrichtung mit dem Steuerventilraumdruck beaufschlagte Fläche der Schulter ist, dann wirkt eine hydraulische Schließkraft auf das Steuerventilglied.A further preferred exemplary embodiment of the fuel injection valve is characterized in that the area of the sealing body acted upon in the closed state of the control valve member against the closing direction is less than or equal to the area of the shoulder which is acted upon in the closing direction by the control valve chamber pressure. If the areas are equal, then the control valve member is pressure balanced. If, in the closed state of the control valve member, the surface of the sealing body acted upon by the control valve chamber pressure against the closing direction is smaller than the area of the shoulder acted upon in the closing direction by the control valve chamber pressure, then a hydraulic closing force acts on the control valve member.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass das Steuerventilglied mit dem Führungsabschnitt in einer Drosselplatte geführt ist. Die Drosselplatte hat im Wesentlichen die Gestalt einer Kreisscheibe mit mehreren Durchgangslöchern und/oder Sacklöchern. Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass die Drosselplatte ein Sackloch umfasst, in welchem das Steuerventilglied mit dem Führungsabschnitt geführt ist und in welches ein Leckölkanal mündet. Das Sackloch ist vorzugsweise als Längsbohrung in der Drosselplatte ausgeführt. Der in das Sackloch mündende Rücklaufkanal oder Leckölkanal ist vorzugsweise als Querbohrung ausgeführt und ermöglicht bei einer Bewegung des Steuerventilsglieds in das Sackloch hinein einen Druckabbau in dem Sackloch.A further preferred embodiment of the fuel injection valve is characterized in that the control valve member is guided with the guide portion in a throttle plate. The throttle plate has substantially the shape of a circular disk with a plurality of through holes and / or blind holes. A further preferred embodiment of the fuel injection valve is characterized in that the throttle plate comprises a blind hole in which the control valve member is guided with the guide portion and in which a leak oil channel opens. The blind hole is preferably designed as a longitudinal bore in the throttle plate. The opening into the blind hole return channel or leakage channel is preferably designed as a transverse bore and allows for a movement of the control valve member into the blind hole in a pressure reduction in the blind hole.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass die Drosselplatte einen Ablaufkanal umfasst, der den Düsennadelsteuerraum mit dem Steuerventilraum verbindet. Der Ablaufkanal ist vorzugsweise mit einer Ablaufdrossel versehen. Die Drosselplatte umfasst des Weiteren einen Zulaufkanal mit einer Zulaufdrossel, über welche der Düsennadelsteuerraum mit Kraftstoff aus einem zentralen Kraftstoffhochdruckspeicher beziehungsweise einer zentralen Kraftstoffhochdruckquelle gefüllt wird.A further preferred embodiment of the fuel injection valve is characterized in that the throttle plate comprises a drain channel which connects the nozzle needle control chamber with the control valve chamber. The drainage channel is preferably provided with an outlet throttle. The throttle plate further comprises an inlet channel with an inlet throttle, via which the nozzle needle control chamber is filled with fuel from a central high-pressure fuel storage or a central high-pressure fuel source.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffeinspritzventils ist dadurch gekennzeichnet, dass der Steuerventilraum in einer Ventilplatte ausgespart ist, die an die Drosselplatte angebaut ist. Die beiden Platten, die auch als Körper oder Scheiben ausgeführt sein können, sind so aneinander angebaut, dass das Sackloch zur Führung des Steuerventilglieds in den Steueventilraum mündet. Das in der Drosselplatte geführte Steuerventilglied ragt mit dem Dichtkörper in den Steuerventilraum der Ventilplatte, die auch den Steuerventilsitz aufweist.Another preferred embodiment of the fuel injection valve is characterized in that the control valve space is recessed in a valve plate which is mounted on the throttle plate. The two plates, which may also be embodied as bodies or disks, are attached to one another such that the blind hole for guiding the control valve member opens into the control valve chamber. The guided in the throttle plate control valve member projects with the sealing body in the control valve chamber of the valve plate, which also has the control valve seat.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist.Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail.
Es zeigen:
- Figur 1
- ein brennraumfernes Ende eines erfindungsgemäßen Kraftstoffeinspritz- ventils und
Figur 2- das brennraumnahe Ende des Kraftstoffeinspritzventils.
- FIG. 1
- a combustion chamber remote end of a fuel injection valve according to the invention and
- FIG. 2
- the combustion chamber near the end of the fuel injection valve.
Die
Die Düsennadel 10 ist an ihrem ventilsitzabgewandten Ende in einer Hülse 22 geführt, wobei die Hülse 22 durch eine Schließfeder 18, die die Düsennadel 10 umgibt und sich der Hülse 22 abgewandt an einem Absatz 16 abstützt, gegen die Drosselscheibe 6 gedrückt. Durch die Hülse 22, die ventilsitzabgewandte Stirnseite der Düsennadel 10 und die Drosselscheibe 6 wird ein Düsennadelsteuerraum 20 begrenzt, der mit Kraftstoff befüllt ist, so dass durch den Druck im Düsennadelsteuerraum 20 eine hydraulische Kraft auf die ventilsitzabgewandte Stirnseite der Düsennadel 10 ausgeübt wird und eine Kraft in Richtung des Düsensitzes 13 auf die Düsennadel 10 ausübt.The
Im Haltekörper 2, dem Ventilkörper 4 und der Drosselscheibe 6 ist ein Zulaufkanal 25 ausgebildet, über den verdichteter Kraftstoff unter hohem Druck von einer Kraftstoffhochdruckquelle in den Druckraum 14 geleitet wird. Ein mehrere Abschnitte 24, 25, 26 umfassender Zulaufkanal oder Hochdruckkanal 25 ist mit dem Steuerraum 20 über einen in der Drosselscheibe 6 verlaufenden Zulaufkanal 39 mit einer Zulaufdrossel 40 verbunden. Mit einer gewissen zeitlichen Verzögerung stellt sich so stets der gleiche Kraftstoffdruck zwischen dem Hochdruckkanal 25 und dem Düsennadelsteuerraum 20 ein.In the
Zur Steuerung des Kraftstoffdrucks im Düsennadelsteuerraum 20 ist ein Steuerventil 30 im Ventilkörper 4 vorgesehen, wobei das Steuerventil 30 einen Steuerventilraum 31 aufweist, der als Hohlraum im Ventilkörper 4 ausgebildet ist. Der Steuerventilraum 31 ist über einen Ablaufkanal mit einer Ablaufdrossel 42, die in der Drosselscheibe 6 ausgebildet ist, mit dem Düsennadelsteuerraum 20 im Düsenkörper 6 verbunden.For controlling the fuel pressure in the nozzle
In den Steuerventilraum 31 ragt ein Steuerventilglied 34, das als Ventilbolzen oder Ventilkolben 45 ausgeführt ist. Der Ventilbolzen 45 weist an seinem brennraumnahen Ende einen Führungsabschnitt 44 auf, mit dem der Ventilbolzen 45 beziehungsweise das Steuerventilglied 34 hin und her bewegbar in einem Sackloch 46 der Drosselplatte 6 geführt ist. Im Bereich des Bodens 48 des Sacklochs 46 mündet ein Leckölkanal 49 in das Sackloch 46. Der Leckölkanal 49, der auch als Rücklaufkanal bezeichnet wird, steht mit einem Druckentlastungsraum in Verbindung, der zum Beispiel mit Umgebungsdruck beaufschlagt ist. Das Steuerventilglied 34 umfasst ein zentrales Sackloch 50, das sich von dem brennraumnahen Ende des Ventilbolzens 45 bis zu einem Dichtkörper 52 erstreckt, der an dem brennraumfernen Ende des Steuerventilglieds 34 ausgebildet ist. Der Dichtkörper 52 ist mit einer Dichtfläche oder Dichtkante ausgestattet, die mit einer Dichtkante oder Dichtfläche an dem Ventilkörper 4 zusammenwirkt, um einen Steuerventilsitz 54 darzustellen.In the
Wenn der Dichtkörper 52 dicht an dem Ventilkörper anliegt, dann ist der Steuerventilsitz 54 geschlossen. Wenn der Dichtkörper 52 von dem Ventilkörper 4 abhebt, das heißt, wenn sich das Steuerventilglied 34 mit dem Dichtkörper 52 aus seiner in
Das Steuerventilglied 34 ist durch einen Aktor 60 betätigbar, der zum Beispiel als Piezoaktor ausgeführt ist. An dem brennraumnahen Ende des Aktors 60 ist eine Nase 61 ausgebildet, die mit ihrem freien Ende an dem Dichtkörper 52 anliegt beziehungsweise zur Anlage bringbar ist. Das Steuerventilglied 34 umfasst des Weiteren einen Bund 64, der auf seiner dem Brennraum abgewandten Seite einstückig mit dem Dichtkörper 52 verbunden ist. Der Dichtkörper 52 kann alternativ auch als separates Bauteil ausgeführt sein. Auf seiner dem Brennraum zugewandten Seite bildet der Bund 64 eine Schulter 65, an der eine Ventilfeder 68 anliegt und die mit dem Steuerventilraumdruck beaufschlagt ist. Die Ventilfeder 68 ist in einem Ringraum in axialer Richtung zwischen der Schulter 65 und der Drosselplatte 6 eingespannt und vorzugsweise als Schraubendruckfeder ausgebildet.The
Der Kraftstoffeinspritzvorrichtung 1 wird über den Zulaufkanal 24 bis 26 mit Hochdruck beaufschlagter Kraftstoff zugeführt. Dieser Hochdruck wird auch als Raildruck bezeichnet. Über den Zulaufkanal 39 mit der Zulaufdrossel 40 gelangt der Raildruck in den Düsennadelsteuerraum 20. Über den Ablaufkanal 41 mit der Ablaufdrossel 42 gelangt der Raildruck in den Steuerventilraum 31.The fuel injection device 1 is supplied via the
Das Steuerventilglied 34 kann kraftausgeglichen ausgeführt sein. Bei einem kraftausgeglichenen Steuerventilglied 34 ist die entgegen der Schließrichtung, das heißt in
Wenn der vorzugsweise als Piezoaktor ausgeführte Aktor 60 bestromt wird, dann dehnt er sich aus, so dass das Steuerventilglied 34 mit dem Dichtkörper 52 nach unten bewegt. Dadurch wird die Verbindung zwischen dem Steuerventilraum 31 und dem Leckölraum beziehungsweise Rücklaufraum 55 über den Steuerventilsitz 54 freigegeben. Dadurch wird der Druck in dem Steuerventilraum 31 und über den Ablaufkanal 41 mit der Ablaufdrossel 42 auch in dem Düsennadelsteuerraum 20 geringer, wodurch sich die Düsennadel 10 aus ihrem Düsensitz 13 bewegt. Dadurch wird eine Einspritzung von Kraftstoff aus dem Druckraum 14 durch die Spritzlöcher beziehungsweise Einspritzöffnungen 12 ausgelöst.When the
Wenn die Ansteuerung beziehungsweise Bestromung des Aktors 60 ausgeschaltet wird, dann wird das Steuerventilglied 34 durch die Vorspannkraft der Ventilfeder 68 und gegebenenfalls durch eine sich aus einem eingestellten Flächenverhältnis ergebende hydraulische Schließkraft geschlossen, so dass der Steuerventilraum 31 über den Ablaufkanal 41 mit der Ablaufdrossel 42 mit Kraftstoff aus dem Düsennadelsteuerraum 20 gefüllt wird. Durch den zunehmenden Druck in dem Düsennadelsteuerraum 20 schließt die Düsennadel.If the control or energization of the
Die Größe der hydraulischen Schließkraft beziehungsweise die hydraulische Druckunterstützung des Steuerventilglieds 34 beim Schließen ist abhängig vomThe size of the hydraulic closing force or the hydraulic pressure support of the
Raildruck. Das heißt, bei kleinen Raildrücken ist die hydraulische Schließkraft geringer als bei großen Raildrücken. Dadurch kann der Verschleiß am Steuerventilsitz 54 reduziert werden. Darüber hinaus kann durch das reduzierte Volumen des Steuerventilraums 31 der Gradient beim Einspritzen reduziert werden, wodurch sich die Einspritzmenge genauer einstellen lässt. Des Weiteren kann eine Dichthülse, wie sie zur Führung des Steuerventilglieds 34 verwendet werden kann, entfallen.Rail pressure. That is, with small Raildrücken the hydraulic closing force is lower than with large rail pressures. Thereby, the wear on the control valve seat 54 can be reduced. In addition, the reduced volume of the
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910027709 DE102009027709A1 (en) | 2009-07-15 | 2009-07-15 | Fuel injection valve |
Publications (2)
Publication Number | Publication Date |
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EP2275667A1 true EP2275667A1 (en) | 2011-01-19 |
EP2275667B1 EP2275667B1 (en) | 2013-09-04 |
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ID=42813097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20100162914 Not-in-force EP2275667B1 (en) | 2009-07-15 | 2010-05-17 | Fuel injection valve |
Country Status (2)
Country | Link |
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EP (1) | EP2275667B1 (en) |
DE (1) | DE102009027709A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2412965A3 (en) * | 2010-07-27 | 2014-05-07 | Robert Bosch GmbH | Fuel injector valve |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10225209A1 (en) * | 2001-06-07 | 2003-01-09 | Denso Corp | Fuel injector for diesel engine, has movable element that abuts with control valve when control valve is lifted by drive such that control chambers are in contact with each other |
DE102006050163A1 (en) * | 2006-10-25 | 2008-04-30 | Robert Bosch Gmbh | Injector i.e. common rail injector, for injecting fuel into combustion chamber of internal combustion engine, has spring pressing piston on seat and casing on surface, where piston diameter in casing corresponds to piston diameter at seat |
WO2009130065A1 (en) * | 2008-04-23 | 2009-10-29 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
-
2009
- 2009-07-15 DE DE200910027709 patent/DE102009027709A1/en not_active Withdrawn
-
2010
- 2010-05-17 EP EP20100162914 patent/EP2275667B1/en not_active Not-in-force
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10225209A1 (en) * | 2001-06-07 | 2003-01-09 | Denso Corp | Fuel injector for diesel engine, has movable element that abuts with control valve when control valve is lifted by drive such that control chambers are in contact with each other |
DE102006050163A1 (en) * | 2006-10-25 | 2008-04-30 | Robert Bosch Gmbh | Injector i.e. common rail injector, for injecting fuel into combustion chamber of internal combustion engine, has spring pressing piston on seat and casing on surface, where piston diameter in casing corresponds to piston diameter at seat |
WO2009130065A1 (en) * | 2008-04-23 | 2009-10-29 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2412965A3 (en) * | 2010-07-27 | 2014-05-07 | Robert Bosch GmbH | Fuel injector valve |
Also Published As
Publication number | Publication date |
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EP2275667B1 (en) | 2013-09-04 |
DE102009027709A1 (en) | 2011-01-20 |
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