EP2628940B1 - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- EP2628940B1 EP2628940B1 EP13152181.7A EP13152181A EP2628940B1 EP 2628940 B1 EP2628940 B1 EP 2628940B1 EP 13152181 A EP13152181 A EP 13152181A EP 2628940 B1 EP2628940 B1 EP 2628940B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- chamber
- throttle
- control
- fuel injector
- 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.)
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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
- F02M63/0031—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
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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
- F02M63/0054—Check 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/001—Control chambers formed by movable sleeves
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle
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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)
Description
Die Erfindung betrifft einen Kraftstoffinjektor für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system, having the features of the preamble of claim 1.
Aus der Offenlegungsschrift
Die Anordnung des Steuerventils im Niederdruckbereich weist den Nachteil auf, dass bei geöffnetem Steuerventil die abströmende Steuermenge nicht auf die im Steuerraum vorhandene Menge begrenzt ist, sondern durch nachströmenden Kraftstoff, welcher über die Zulaufdrossel in den Steuerraum gelangt, erhöht wird. Dadurch wird zum Einen die Effizienz des Einspritzsystems verringert und zum Anderen der Wärmeeintrag am Aktor erhöht.The arrangement of the control valve in the low-pressure region has the disadvantage that when the control valve is open, the outflowing control quantity is not limited to the amount present in the control chamber, but is increased by inflowing fuel, which passes via the inlet throttle into the control chamber. This reduces the efficiency of the injection system and increases the heat input at the actuator.
Aus der
Aufgabe der vorliegenden Erfindung ist es daher, einen Kraftstoffinjektor der vorstehend genannten Art anzugeben, welcher diesen Nachteil nicht oder zumindest in deutlich verringertem Maße aufweist.Object of the present invention is therefore to provide a fuel injector of the aforementioned type, which does not have this disadvantage or at least to a significantly reduced extent.
Zur Lösung der Aufgabe wird der Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.To solve the problem, the fuel injector with the features of claim 1 is proposed. Advantageous developments of the invention are specified in the subclaims.
Der vorgeschlagene Kraftstoffinjektor umfasst ein Steuerventil zur Steuerung der Hubbewegung einer hubbeweglichen Düsennadel, wobei das Steuerventil ein in einem Ventilraum hubbeweglich aufgenommenes Ventilelement besitzt, das mittels einer Ventilfeder gegen einen Ventilsitz vorgespannt und mittels eines Aktors entgegen der Federkraft der Ventilfeder aus dem Ventilsitz hebbar ist, so dass eine Verbindung des Ventilraums mit einem Niederdruckbereich herstellbar ist. Die hergestellte Verbindung des Ventilraums mit dem Niederdruckbereich bewirkt einen Druckabfall im Ventilraum des Steuerventils sowie in einem über eine Ablaufdrossel in Verbindung mit dem Ventilraum stehenden und von einer Stirnfläche der Düsennadel begrenzten Steuerraum, so dass die Düsennadel öffnet. In Schließstellung des Steuerventils hingegen ist über eine mit einem Zulaufkanal in Verbindung stehende Zulaufdrossel ein Druckanstieg im Steuerraum bewirkbar, welcher zum Schließen der Düsennadel führt. Erfindungsgemäß ist die Zulaufdrossel über ein zusätzliches Schließelement passiv schaltbar.The proposed fuel injector comprises a control valve for controlling the lifting movement of a liftable nozzle needle, wherein the control valve has a liftable in a valve chamber valve member which is biased by a valve spring against a valve seat and by means of an actuator against the spring force of the valve spring from the valve seat can be raised, so that a connection of the valve chamber with a low-pressure region can be produced. The established connection of the valve chamber with the low-pressure region causes a pressure drop in the valve chamber of the control valve and in a via a drain throttle in communication with the valve chamber and limited by an end face of the nozzle needle control chamber, so that the nozzle needle opens. In the closed position of the control valve, however, a pressure increase in the control chamber is effected via an inlet throttle communicating with an inlet channel, which leads to the closing of the nozzle needle. According to the invention, the inlet throttle is passively switchable via an additional closing element.
Durch passives Schalten der Zulaufdrossel kann bei geöffnetem Steuerventil die Verbindung des Steuerraums mit dem Zulaufkanal getrennt und die über die Ablaufdrossel und den Ventilraum in den Niederdruckbereich abströmende Steuermenge auf die im Steuerraum vorhandene Menge beschränkt werden. Dies hat eine Verringerung der Steuermenge zur Folge, wodurch die Effizienz des Einspritzsystems, insbesondere im Hinblick auf die CO2-Bilanz, erhöht wird. Zugleich nimmt der Wärmeeintrag am Aktor ab, da aufgrund der verringerten Steuermenge weniger erwärmter Kraftstoff in den Niederdruckbereich gelangt.By passive switching of the inlet throttle, the connection of the control chamber with the inlet channel can be separated with open control valve and limited via the outlet throttle and the valve chamber in the low pressure region control amount to the existing amount in the control room. This results in a reduction of the control amount, whereby the efficiency of the injection system, in particular with regard to the CO 2 balance, is increased. At the same time, the heat input at the actuator decreases because less heated fuel reaches the low pressure area due to the reduced control quantity.
Durch das passive Schalten der Zulaufdrossel können Zulauf- und Ablaufdrossel unabhängig voneinander ausgelegt werden, wobei über die Auslegung der Zulaufdrossel das Schließverhalten und über die Auslegung der Ablaufdrossel das Öffnungsverhalten des Injektors gezielt beeinflussbar sind.Through the passive switching of the inlet throttle inlet and outlet throttle can be designed independently, the design of the inlet throttle the closing behavior and the design of the outlet throttle the opening behavior of the injector can be selectively influenced.
Erfindungsgemäß ist das zusätzliche Schließelement im Steuerraum aufgenommen und zumindest teilweise elastisch verformbar ausgeführt. Bei Anordnung des Schließelementes im Steuerraum bildet dieses vorzugsweise eine Art Rückschlagventil aus, das durch den im Steuerraum vorhandenen Steuerdruck in einer Schließstellung gehalten wird, in welcher - vorzugsweise bei geöffnetem Steuerventil - keine Verbindung der Zulaufdrossel und/oder des Zulaufkanals mit dem Steuerraum besteht. Mit Schließen des Steuerventils steigt zunächst der Druck im Ventilraum an, da Kraftstoff, beispielsweise im Wege der Leckage, in den Ventilraum gelangt. Der Druckanstieg im Ventilraum hat zur Folge, dass das im Steuerraum aufgenommene Schließelement über die Ablaufdrossel von einer der Schließkraft entgegengesetzt wirkenden Druckkraft beaufschlagt wird. Aufgrund der zumindest teilweisen elastisch verformbaren Ausführung des Schließelementes bewirkt diese Druckkraft, dass das Schließelement in eine Offenstellung überführt wird, in welcher eine Verbindung der Zulaufdrossel und/oder des Zulaufkanals mit dem Steuerraum besteht, so dass eine schnelle Wiederbefüllung des Steuerraums gewährleistet ist.According to the invention, the additional closing element is accommodated in the control space and at least partially designed elastically deformable. When the closure element is arranged in the control chamber, it preferably forms a type of check valve, which is held in a closed position by the control pressure present in the control chamber, in which there is no connection of the inlet throttle and / or the inlet channel to the control chamber, preferably with the control valve open. When the control valve closes, the pressure in the valve chamber initially rises, since fuel, for example by way of leakage, enters the valve chamber. The increase in pressure in the valve chamber has the consequence that the closing element received in the control chamber is acted upon by the outlet throttle of a compressive force acting in the opposite direction to the closing force. Due to the at least partially elastically deformable design of the closing element, this pressure force causes the closing element to be transferred into an open position, in which there is a connection between the inlet throttle and / or the inlet channel with the control chamber, so that rapid refilling of the control chamber is ensured.
Weiterhin bevorzugt besitzt das zusätzliche Schließelement wenigstens eine, vorzugsweise als Drossel ausgebildete, Durchströmöffnung. Die wenigstens eine Durchströmöffnung kann der Verbindung des Steuerraums mit dem Zulaufkanal und/oder dem Ventilraum dienen. Ist die Durchströmöffnung zugleich als Drossel ausgebildet, kann auf die zusätzliche Ausbildung einer Zulauf- und/oder Ablaufdrossel verzichtet werden. Sofern die wenigstens eine Durchströmöffnung nicht zugleich als Drossel ausgebildet ist, ist die Zulaufdrossel bevorzugt im Zulaufkanal und/oder die Ablaufdrossel in einem Ablaufkanal angeordnet, welcher vorzugsweise den Steuerraum mit dem Ventilraum verbindet. Sofern die wenigstens eine im Schließelement vorgesehene Durchströmöffnung zugleich als Ablaufdrossel dient, ist diese bevorzugt koaxial zum Ablaufkanal angeordnet, um auch in Schließstellung des Schließelementes eine Verbindung des Steuerraums mit dem Ventilraum des Steuerventils sicherzustellen.Further preferably, the additional closing element has at least one, preferably designed as a throttle, flow-through. The at least one flow-through opening can serve to connect the control chamber to the inlet channel and / or the valve chamber. If the flow-through opening is also designed as a throttle, the additional design of an inlet and / or outlet throttle can be dispensed with. If the at least one flow opening is not at the same time designed as a throttle, the inlet throttle is preferably arranged in the inlet channel and / or the outlet throttle in a flow channel, which preferably connects the control chamber with the valve chamber. If the at least one flow opening provided in the closing element at the same time serves as an outlet throttle, this is preferably arranged coaxially to the flow channel to ensure a connection of the control chamber with the valve chamber of the control valve even in the closed position of the closing element.
Erfindungsgemäß ist das zusätzliche Schließelement scheibenförmig ausgebildet. Die Scheibenform bedarf nur eines geringen zusätzlichen Bauraums, so dass die Abmessungen des Injektors weitgehend unverändert bleiben können. Alternativ oder ergänzend wird zur Lagefixierung des Schließelementes vorgeschlagen, dass das Schließelement ein exzentrisch angeordnetes Fixierelement, vorzugsweise in Form einer Nase, eines Stiftes und/oder einer Lasche, besitzt. Das Fixierelement kann dabei außenumfangseitig oder auf einer Ober- oder Unterseite des vorzugsweise scheibenförmigen Schließelementes angeordnet sein. Im Injektor ist weiterhin bevorzugt eine Aufnahme für das Fixierelement ausgebildet, in welche das Fixierelement formschlüssig eingesetzt werden kann. Der Formschluss soll insbesondere ein Verdrehen des Schließelementes sowie eine damit einhergehende Lageveränderung der wenigstens einen Durchströmöffnung in Bezug auf einen Zulauf- oder Ablaufkanal verhindern. Demnach kommt das vorgeschlagene Fixierelement insbesondere bei Schließelementen zum Tragen, die eine kreisförmige Außenkontur besitzen.According to the invention, the additional closing element is disc-shaped. The disk shape requires only a small additional space, so that the dimensions of the injector can remain largely unchanged. Alternatively or additionally, it is proposed for fixing the position of the closing element that the closing element has an eccentrically arranged fixing element, preferably in the form of a nose, a pin and / or a tab. The fixing element may be arranged on the outer circumference side or on an upper or lower side of the preferably disk-shaped closing element. In the injector, a receptacle for the fixing element is further preferably formed, into which the fixing element can be inserted in a form-fitting manner. The positive connection is intended in particular to prevent a twisting of the closing element and a concomitant change in position of the at least one through-flow opening with respect to an inlet or outlet channel. Accordingly, the proposed fixing element comes into play particularly in closure elements which have a circular outer contour.
Gemäß einer Weiterbildung der Erfindung besitzt das zusätzliche Schließelement einen Federarm und einen Stützring, welcher den Federarm umgibt. Bevorzugt sind der Federarm und der Stützring einstückig ausgebildet. Ein solches Schließelement lässt sich in einfacher Weise als Stanzteil herstellen. Der Stützring dient der Abstützung des Schließelementes, während der bewegliche Federarm das eigentliche Schließelement darstellt, das in Offenstellung eine Verbindung der Zulaufdrossel mit dem Steuerraum bewirkt. Die wenigstens eine Durchströmöffnung zur Verbindung des Steuerraums mit dem Zulaufkanal und/oder dem Ventilraum ist daher bevorzugt im Federarm des Schließelementes angeordnet. Sofern ein Fixierelement am Schließelement vorgesehen ist, ist dieses vorteilhafterweise am Stützring angeordnet.According to one embodiment of the invention, the additional closing element has a spring arm and a support ring which surrounds the spring arm. Preferably, the spring arm and the support ring are integrally formed. Such a closure element can be produced in a simple manner as a stamped part. The support ring serves to support the closing element, while the movable spring arm represents the actual closing element, which causes a connection of the inlet throttle with the control chamber in the open position. The at least one flow-through opening for connecting the control chamber to the inlet channel and / or the valve chamber is therefore preferably arranged in the spring arm of the closing element. If a fixing element is provided on the closing element, this is advantageously arranged on the support ring.
Des Weiteren wird vorgeschlagen, dass der Umriss des Federarms im Wesentlichen die Form einer Zunge, eines Kreise oder eines Pilzes besitzt. Der Federarm besitzt somit eine ausreichend große Oberfläche, welche einerseits als Schließfläche, andererseits der Aufnahme der wenigstens einen Durchströmöffnung dient.Furthermore, it is proposed that the outline of the spring arm has substantially the shape of a tongue, a circle or a mushroom. The spring arm thus has a sufficiently large surface, which serves on the one hand as a closing surface, on the other hand, the recording of at least one flow opening.
Erfindungsgemäß ist das zusätzliche Schließelement zwischen einer Drosselplatte und einer den Steuerraum radial begrenzenden Hülse angeordnet ist, welche die Düsennadel umgibt. Über die Hülse, welche vorzugsweise unmittelbar oder mittelbar von der Druckkraft einer Feder in Richtung der Drosselplatte beaufschlagt wird, wird das Schließelement zumindest in einem Außenumfangsbereich, bevorzugt im Bereich eines Stützrings, in Anlage mit der Drosselplatte gehalten, während ein elastisch verformbarer zentraler Bereich des Schließelementes, bevorzugt in Form eines Federarms, von der Drosselplatte abheben und auf diese Weise die Zulaufdrossel und/oder den Zulaufkanal, in welcher die Zulaufdrossel ausgebildet ist, freigeben kann. Dies ist dann der Fall, wenn der elastisch verformbare zentrale Bereich ventilraumseitig von einem Druck beaufschlagt wird, welcher größer als der steuerraumseitig anliegende Druck ist.According to the invention, the additional closing element is arranged between a throttle plate and a sleeve radially delimiting the control chamber, which surrounds the nozzle needle. The closing element is held in contact with the throttle plate at least in an outer peripheral region, preferably in the region of a support ring, via the sleeve, which is preferably acted upon directly or indirectly by the pressure force of a spring in the direction of the throttle plate, while an elastically deformable central region of the closing element , preferably in the form of a spring arm, lift off from the throttle plate and in this way the inlet throttle and / or the inlet channel, in which the inlet throttle is formed, can release. This is the case when the elastically deformable central region is acted upon by a pressure on the valve chamber side, which pressure is greater than the pressure applied to the control chamber side.
Gemäß einer Weiterbildung der Erfindung wird vorgeschlagen, dass in der dem Steuerraum zugewandten Oberfläche der Drosselplatte eine Nut ausgebildet ist, über welche der Ventilraum mit dem Zulaufkanal verbindbar ist. Die Verbindung des Ventilraums mit dem Zulaufkanal gewährleistet eine schnelle Wiederbefüllung des Ventilraums und damit einen schnellen Druckanstieg im Ventilraum nach dem Schließen des Steuerventils. Dies hat zur Folge, dass der am Schließelement ventilraumseitig anliegende Druck den steuerraumseitig anliegenden Druck übersteigt und das Schließelement in eine Offenstellung überführt wird. In Offenstellung des Schließelementes besteht eine Verbindung der Zulaufdrossel und/oder des Zulaufkanals mit dem Steuerraum, so dass hierüber eine schnelle Wiederbefüllung des Steuerraums sowie Anhebung des Steuerdrucks gewährleistet ist, welcher zum Schließen der Düsennadel führt. Der Einspritzvorgang ist damit beendet.According to one embodiment of the invention it is proposed that in the control chamber facing surface of the throttle plate, a groove is formed, via which the valve chamber is connectable to the inlet channel. The connection of the valve chamber with the inlet channel ensures a rapid refilling of the valve chamber and thus a rapid increase in pressure in the valve chamber after closing the control valve. As a result, the pressure applied to the closing element on the valve chamber side exceeds the pressure applied on the control chamber side and the closing element is transferred into an open position. In the open position of the closing element there is a connection of the inlet throttle and / or the inlet channel with the control chamber, so that hereby a fast refilling of the control chamber and raising the control pressure is ensured, which leads to the closing of the nozzle needle. The injection process is over.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher beschrieben. Diese zeigen:
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Fig. 1 einen schematischen Längsschnitt durch einen erfindungsgemäßen Kraftstoffinjektor im Bereich seines Steuerventils, -
Fig. 2 einen schematischen Längsschnitt durch einen weiteren erfindungsgemäßen Kraftstoffinjektor im Bereich seines Steuerventils, -
Fig. 3a-c jeweils eine Draufsicht auf ein Schließelement eines erfindungsgemäßen Kraftstoffinjektors mit unterschiedlich geformten Federarmen und -
Fig. 4a-c jeweils eine Draufsicht auf ein Schließelement eines erfindungsgemäßen Kraftstoffinjektors mit unterschiedlich ausgestalteten Fixierelementen.
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Fig. 1 a schematic longitudinal section through a fuel injector according to the invention in the region of its control valve, -
Fig. 2 a schematic longitudinal section through another fuel injector according to the invention in the region of its control valve, -
Fig. 3a-c in each case a plan view of a closing element of a fuel injector according to the invention with differently shaped spring arms and -
Fig. 4a-c in each case a plan view of a closing element of a fuel injector according to the invention with differently designed fixing elements.
Der in der
Um in Offenstellung des Steuerventils 1 die über die Ablaufdrossel 9 und den Ventilraum 3 abströmende Steuermenge zu beschränken, weist der erfindungsgemäße Kraftstoffinjektor der
Um den Einspritzvorgang zu beenden, wird die Aktivierung des Aktors 7 beendet, so dass das Ventilelement 4 des Steuerventils 1 über die Druckkraft der Ventilfeder 5 zurück in den Ventilsitz 6 gestellt wird. Das Steuerventil 1 schließt. Durch die Wiederbefüllung des Ventilraums 3, beispielsweise im Wege der Leckage, steigt der Druck im Ventilraum 3 und im Ablaufkanal 22 an. Der ventilraumseitig anliegende Druck bewirkt eine Druckkraft, welche das Schließelement 14 in Öffnungsrichtung beaufschlagt. Das Schließelement 14 wird somit in eine Offenstellung überführt, in welcher eine Verbindung des Steuerraums 11 mit dem Zulaufkanal 12 hergestellt ist. Durch die hergestellte Verbindung ist eine schnelle Wiederbefüllung des Steuerraums 11 gewährleistet, welcher zu einem schnellen Druckanstieg im Steuerraum 11 und zum Schließen der Düsennadel 2 führt. Der Einspritzvorgang ist beendet.To end the injection process, the activation of the
Bevorzugte Ausführungsformen des Schließelementes 14 sind in den
Wie den
Den
Eine Weiterbildung des Kraftstoffinjektors der
Claims (7)
- Fuel injector for a fuel injection system, in particular a common-rail injection system, comprising a control valve (1) for controlling the stroke movement of a nozzle needle (2) which can perform a stroke movement, wherein the control valve (1) has a valve element (4) which is received, such that it can perform a stroke movement, in a valve chamber (3) and which is preloaded by means of a valve spring (5) against a valve seat (6) and which, by means of an actuator (7) and counter to the spring force of the valve spring (5), can be lifted out of the valve seat (6) such that a connection of the valve chamber (3) to a low-pressure region (8) can be produced, wherein the connection produced between the valve chamber (3) and the low-pressure region (8) causes a pressure drop in the valve chamber (3) of the control valve (1), and in a control chamber (11) connected to the valve chamber (3) via an outflow throttle (9) and delimited by an end surface (10) of the nozzle needle (2), such that the nozzle needle (2) opens, whereas, when the control valve (1) is in a closed position, a pressure rise in the control chamber (11) can be effected via an inflow throttle (13) which is connected to an inflow duct (12), which pressure rise leads to the closure of the nozzle needle (2), characterized in that the inflow throttle (13) can be passively switched by means of an additional closure element (14), and the additional closure element (14) is received in the control chamber (11) and is of at least partially elastically deformable design, wherein the additional closure element (14) is of disc-shaped form, and wherein the additional closure element is arranged between a throttle plate and a sleeve which radially delimits the control chamber and which surrounds the nozzle needle.
- Fuel injector according to Claim 1, characterized in that the additional closure element (14) has at least one throughflow opening (9, 15) which is preferably in the form of a throttle.
- Fuel injector according to Claim 1 or 2, characterized in that, for fixing in position, has an eccentrically arranged fixing element (16), preferably in the form of a lug, a pin and/or a tab.
- Fuel injector according to one of the preceding claims, characterized in that the additional closure element (14) has a spring arm (17) and a support ring (18) which surrounds the spring arm (17), wherein the spring arm (17) and the support ring (18) are preferably formed in one piece.
- Fuel injector according to Claim 4, characterized in that the spring arm (17) has a substantially tongue-shaped, circular or mushroom-shaped outline.
- Fuel injector according to one of the preceding claims, characterized in that the additional closure element (14) is arranged between a throttle plate (19) and a sleeve (20) which radially delimits the control chamber (11) and which surrounds the nozzle needle (2).
- Fuel injector according to Claim 6, characterized in that, in that surface of the throttle plate (19) which faces toward the control chamber (11), there is formed a groove (21) via which the valve chamber (3) can be connected to the inflow duct (12).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210202538 DE102012202538A1 (en) | 2012-02-20 | 2012-02-20 | fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2628940A1 EP2628940A1 (en) | 2013-08-21 |
EP2628940B1 true EP2628940B1 (en) | 2015-08-12 |
Family
ID=47563304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13152181.7A Not-in-force EP2628940B1 (en) | 2012-02-20 | 2013-01-22 | Fuel injector |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2628940B1 (en) |
DE (1) | DE102012202538A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201412086D0 (en) * | 2014-07-08 | 2014-08-20 | Delphi International Operations Luxembourg S.�.R.L. | Fuel injector for an internal combustion engine |
GB201414669D0 (en) * | 2014-08-19 | 2014-10-01 | Delphi International Operations Luxembourg S.�.R.L. | Control valve arrangement |
DE102015205582A1 (en) | 2015-03-27 | 2016-09-29 | Robert Bosch Gmbh | Fuel injector for a fuel injection system |
FR3050771B1 (en) * | 2016-04-29 | 2018-06-01 | Delphi Technologies Ip Limited | FUEL INJECTOR |
DE102017116367A1 (en) * | 2017-07-20 | 2019-01-24 | Liebherr-Components Deggendorf Gmbh | Device for controlling an injector |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011208554A (en) * | 2010-03-29 | 2011-10-20 | Denso Corp | Fuel injection device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3555264B2 (en) * | 1995-07-14 | 2004-08-18 | いすゞ自動車株式会社 | Fuel injection device for internal combustion engine |
JP2002202022A (en) * | 2000-10-30 | 2002-07-19 | Denso Corp | Valve driving device and fuel injection valve |
ITBO20020360A1 (en) * | 2002-06-07 | 2003-12-09 | Magneti Marelli Powertrain Spa | FUEL INJECTOR FOR AN INTERNAL COMBUSTION ENGINE WITH MULTI-HOLE SPRAYING |
DE102004030445A1 (en) | 2004-06-24 | 2006-01-12 | Robert Bosch Gmbh | Fuel injector |
ITBO20040649A1 (en) * | 2004-10-20 | 2005-01-20 | Magneti Marelli Powertrain Spa | FUEL INJECTOR WITH ELECTROMAGNETIC IMPLEMENTATION OF THE PIN |
JP5110321B2 (en) * | 2006-03-03 | 2012-12-26 | ガンサー−ハイドロマグ アーゲー | Fuel injection valve for internal combustion engine |
JP5625837B2 (en) * | 2010-03-31 | 2014-11-19 | 株式会社デンソー | Fuel injection device |
-
2012
- 2012-02-20 DE DE201210202538 patent/DE102012202538A1/en not_active Withdrawn
-
2013
- 2013-01-22 EP EP13152181.7A patent/EP2628940B1/en not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011208554A (en) * | 2010-03-29 | 2011-10-20 | Denso Corp | Fuel injection device |
Also Published As
Publication number | Publication date |
---|---|
DE102012202538A1 (en) | 2013-08-22 |
EP2628940A1 (en) | 2013-08-21 |
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