DE102006035982A1 - Injector for fuel injection system of internal-combustion engine, has piezo-electric actuator formed as pipe and radially limiting coupling space in its interior in area of its actuator bases - Google Patents
Injector for fuel injection system of internal-combustion engine, has piezo-electric actuator formed as pipe and radially limiting coupling space in its interior in area of its actuator bases Download PDFInfo
- Publication number
- DE102006035982A1 DE102006035982A1 DE200610035982 DE102006035982A DE102006035982A1 DE 102006035982 A1 DE102006035982 A1 DE 102006035982A1 DE 200610035982 DE200610035982 DE 200610035982 DE 102006035982 A DE102006035982 A DE 102006035982A DE 102006035982 A1 DE102006035982 A1 DE 102006035982A1
- Authority
- DE
- Germany
- Prior art keywords
- actuator
- injector
- piezoelectric actuator
- injector according
- coupler
- 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.)
- Withdrawn
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 title claims description 4
- 230000008878 coupling Effects 0.000 title abstract description 9
- 238000010168 coupling process Methods 0.000 title abstract description 9
- 238000005859 coupling reaction Methods 0.000 title abstract description 9
- 238000007789 sealing Methods 0.000 claims description 21
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 abstract description 5
- 239000000945 filler Substances 0.000 description 10
- 238000012856 packing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
-
- 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
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft einen Injektor für eine Kraftstoffeinspritzanlage einer Brennkraftmaschine, insbesondere in einem Kraftfahrzeug, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The The invention relates to an injector for a fuel injection system an internal combustion engine, in particular in a motor vehicle, with the features of the preamble of claim 1.
Bin
Kraftstoffinjektor dieser Art ist beispielsweise aus der
Beim bekannten Injektor wird der Piezoaktor invers betrieben, das heißt, zum Schließen der Düsennadel wird der Injektor bestromt, während er zum Öffnen der Düsennadel entstromt wird. Bei der Entstromung des Injektors verkürzt sich dessen axiale Länge, wodurch er den Kopplerkolben von der Zwischenplatte wegzieht. Hierdurch wird das Volumen des Kopplerraums vergrößert. Der darin erfolgende Druckabfall pflanzt sich in den Steuerraum fort und führt zu einem Öffnungshub der Düsennadel.At the known injector, the piezoelectric actuator is operated inversely, that is, for Shut down the nozzle needle the injector is energized while he opens the nozzle needle is de-energized. When the injector is out of power, it shortens its axial length, causing it to pull the coupler piston away from the intermediate plate. hereby the volume of the coupler space is increased. The pressure drop occurring therein planted in the control room and leads to an opening stroke the nozzle needle.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Injektor mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass er ohne Kopplerkolben und ohne Kopplerhülse auskommt, wodurch sich Herstellungskosten und Montagekosten einsparen lassen. Des Weiteren entfällt ein Verschleiß zwischen Kopplerkolben und Kopplerhülse. Der Piezoaktor muss nicht mehr invers betrieben werden. Das Volumen des Kopplerraums lässt sich genauer herstellen, da es von weniger Einzeltoleranzen abhängt. Des Weiteren kann axiale Baulänge für den Injektor eingespart werden. Die Erfindung beruht hierzu auf dem allgemeinen Gedanken, den Piezoaktor als Rohr auszugestalten, wobei der Kopplerraum zumindest im Bereich eines Aktorfusses im Inneren des rohrförmigen Piezoaktors angeordnet ist und somit durch den Piezoaktor selbst radial begrenzt ist. Bei einer Bestromung des Piezoaktors vergrößert sich das Innere des Rohrkörpers, wodurch auch das Volumen des Kopplerraums zunimmt. Durch Abstimmung der Volumenänderung des Kopplerraums auf die Be- und Entstromung des Piezoaktors kann das gewünschte Übersetzungsverhältnis zwischen Aktorhub und Nadelhub eingestellt werden. Gleichzeitig bleibt beim erfindungsgemäßen Injektor die hydraulische Kopplung zwischen Piezoaktor und Düsennadel erhalten, wodurch ein Temperaturausgleich realisiert wird.Of the Inventive injector with the features of claim 1 has the advantage that he without Coupling piston and without coupler sleeve gets along, which saves manufacturing costs and installation costs to let. Furthermore, deleted a wear between Coupling piston and coupler sleeve. The piezoelectric actuator no longer needs to be operated inversely. The volume of the coupler room make more accurate, as it depends on fewer individual tolerances. Of Furthermore, axial length for the Saved injector. The invention is based on the general idea to design the piezoelectric actuator as a tube, wherein the coupler space at least in the area of an actuator core in the interior of the tubular Piezoactuator is arranged and thus radially by the piezoelectric actuator itself is limited. When energizing the piezoelectric actuator increases the interior of the tubular body, thereby also the volume of the coupler space increases. By vote of Volume change of the Coupler space on the supply and Entstromung of the piezoelectric actuator, the desired transmission ratio between Actuator stroke and needle stroke can be adjusted. At the same time remains injector according to the invention the hydraulic coupling between the piezoactuator and the nozzle needle obtained, whereby a temperature compensation is realized.
Bei einer vorteilhaften Weiterbildung kann der Piezoaktor mit einer Aktorfeder in Richtung Düsennadel vorgespannt sein, wobei die Aktorfeder an einem Aktorkopf abgestützt ist. Durch die Positionierung der Aktorfeder am Aktorkopf kann im Bereich des Aktorfußes Bauraum eingespart werden, was für die Herstellbarkeit und Funktionalität des Injektors vorteilhaft sein kann.at an advantageous development, the piezoelectric actuator with a Actuator spring in the direction of nozzle needle be biased, wherein the actuator spring is supported on an actuator head. Due to the positioning of the actuator spring on the actuator head can be in the range of actuator base Space to be saved, what for the Manufacturability and functionality of the injector may be advantageous.
Bei einer anderen vorteilhaften Ausführungsform enthält der Piezoaktor in seinem Inneren einen Füllkörper, der den Kopplerraum axial begrenzt. Bei diesem Füllkörper kann es sich zweckmäßig um ein Elastomer handeln, das fest mit dem Piezoaktor verbunden ist. Beim Be- und Entstromen des Piezoaktors kommt es dabei zu einer elastischen und reversiblen Verformung des Füllkörpers, da sich der Füllkörper an das sich ändernde Volumen im Inneren des rohrförmigen Piezoaktors anpasst. Gleichzeitig verändert sich auch das Volumen des Kopplerraums, wodurch die gewünschte Ansteuerung der Düsennadel erfolgt.at another advantageous embodiment contains the piezoelectric actuator in its interior a filler body, the axial space of the coupler limited. In this packing can it is expedient to an elastomer act, which is firmly connected to the piezoelectric actuator. When loading and Entstromen of the piezoelectric actuator is thereby an elastic and reversible deformation of the filling body, there the filler body the changing one Volume inside the tubular Adjusts piezoelectric actuator. At the same time, the volume also changes the coupler space, whereby the desired control of the nozzle needle he follows.
Weitere wichtige Merkmale und Vorteile des erfindungsgemäßen Injektors ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the injector according to the invention arise from the dependent claims, from the drawings and from the associated description of the figures the drawings.
Zeichnungendrawings
Ausführungsbeispiele des erfindungsgemäßen Injektors sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen. Es zeigen, jeweils schematisch,embodiments of the injector according to the invention are shown in the drawings and are explained in more detail below, wherein the same reference numerals to the same or similar or functionally identical Refer to components. Show, in each case schematically,
Beschreibung der AusführungsbeispieleDescription of the embodiments
Entsprechend
Der
Injektor
Der
Injektor
Entsprechend
Wie
den
Vorzugsweise
ist der Piezoaktor
Bei
einer anderen Ausführungsform
ist es grundsätzlich
möglich,
den Piezoaktor
Bei
der hier gezeigten Ausführungsform
ist der Aktorfuß
In
entsprechender Weise ist eine Steuerraumdichthülse
Entsprechend
Die
Aktorfeder
Über den
Elektroanschluss
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610035982 DE102006035982A1 (en) | 2006-08-02 | 2006-08-02 | Injector for fuel injection system of internal-combustion engine, has piezo-electric actuator formed as pipe and radially limiting coupling space in its interior in area of its actuator bases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610035982 DE102006035982A1 (en) | 2006-08-02 | 2006-08-02 | Injector for fuel injection system of internal-combustion engine, has piezo-electric actuator formed as pipe and radially limiting coupling space in its interior in area of its actuator bases |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006035982A1 true DE102006035982A1 (en) | 2008-02-07 |
Family
ID=38884838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610035982 Withdrawn DE102006035982A1 (en) | 2006-08-02 | 2006-08-02 | Injector for fuel injection system of internal-combustion engine, has piezo-electric actuator formed as pipe and radially limiting coupling space in its interior in area of its actuator bases |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102006035982A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012080200A1 (en) * | 2010-12-16 | 2012-06-21 | Robert Bosch Gmbh | Piezoelectric actuator module and fuel injection valve |
EP2444649A3 (en) * | 2010-10-19 | 2013-02-27 | Robert Bosch GmbH | Fuel injector, in particular common rail injection system |
-
2006
- 2006-08-02 DE DE200610035982 patent/DE102006035982A1/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2444649A3 (en) * | 2010-10-19 | 2013-02-27 | Robert Bosch GmbH | Fuel injector, in particular common rail injection system |
WO2012080200A1 (en) * | 2010-12-16 | 2012-06-21 | Robert Bosch Gmbh | Piezoelectric actuator module and fuel injection valve |
DE102010063219B4 (en) | 2010-12-16 | 2018-05-24 | Robert Bosch Gmbh | Piezoelectric actuator module and fuel injection valve |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20130803 |