EP1854992B1 - Fuel injection system and method of manufacture - Google Patents
Fuel injection system and method of manufacture Download PDFInfo
- Publication number
- EP1854992B1 EP1854992B1 EP06009556A EP06009556A EP1854992B1 EP 1854992 B1 EP1854992 B1 EP 1854992B1 EP 06009556 A EP06009556 A EP 06009556A EP 06009556 A EP06009556 A EP 06009556A EP 1854992 B1 EP1854992 B1 EP 1854992B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- injection system
- face plate
- aperture
- interior space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims description 45
- 238000002347 injection Methods 0.000 title claims description 42
- 239000007924 injection Substances 0.000 title claims description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 title description 10
- 238000007789 sealing Methods 0.000 claims description 72
- 239000012530 fluid Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 239000003921 oil Substances 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
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
- 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
- F02M63/0057—Means for avoiding fuel contact with valve actuator, e.g. isolating actuators by using bellows or diaphragms
-
- 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
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Definitions
- the invention relates to an injection system with a piezoactuator arranged in the high-pressure chamber and to a method for producing such an injection system.
- Injection systems and in particular leak-less common rail injection systems require a control element, such as a piezo actuator in the high-pressure space.
- a control element such as a piezo actuator in the high-pressure space.
- the pressure must also be able to act laterally on the piezo stack or piezo ceramic body in order to support the extensibility of the piezo stack of the piezo actuator.
- Such a piezoelectric actuator is for example in the WO 02/061856 A1 described.
- the ceramic body of this piezoelectric actuator is wrapped with a polymer or plastic sleeve.
- a hermetic sealing of the ceramic body to the fuel under a high fuel pressure, such as 2000 bar is hardly or not feasible with the plastics known at the filing date of the present patent application.
- a case-by-case unavoidable electrical conductivity of commercially available fuels for example due to a low acid content, there may be flashover between the internal electrodes of the piezoelectric actuator even at low wetting of the piezoelectric ceramic.
- high strains of the plastic sheath occur at the poling cracks, which aggravate this problem.
- WO 02/061856 describes the use of a filling material between the piezo stack and the polymer or plastic sleeve.
- a filling material between the piezo stack and the polymer or plastic sleeve.
- the filling material is consumed or destroyed over the service life of the piezo actuator.
- the reduced filling material requires that the pressure applied to the outside of the piezo actuator can no longer be efficiently transferred to the piezo stack.
- the applicant for transferring the pressure on the piezo stack of the piezo actuator internally known a solution with a hermetically sealed, metallic sleeve, which provides an actuator interior space between the piezo stack and the sleeve.
- a filler e.g. a silicone oil
- this internally known to the Applicant solution has the disadvantage that the seal between the piezo-stack and the sleeve at the point at which an electric pin feedthrough or contact device for contacting and controlling the piezoelectric stack is passed through the seal, not at longer Operating periods and especially not at high pressures, such as 2000 bar, hermetically sealed.
- a leakage of the filler could make the piezo actuator and thus the injection system inoperable.
- EP-A-1 431 568 describes a fuel injection valve, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, with a piezoelectric, electrostrictive or magnetostrictive actuator and with the actuator, operatively connected via an actuation rod valve closing body, which cooperates with a valve seat surface to a sealing seat, wherein the actuator is hermetically sealed by an actuator housing, the flexible portion is connected to the actuation strand and the actuator in the actuator housing has a compensation element for equalizing pressure differences between the interior and the exterior of the actuator housing, wherein the compensation element is completely structurally separated from the actuation strand or radically arranged to the actuator sides of the actuator housing form the flexible portion.
- the publication EP-A-1 420 467 describes an actuator with a top plate having at least one passage opening in particular for a contact pin.
- a contact tongue carrier is pushed with a contact tongue.
- the invention proposes sealingly attach a sealing disc on the open side of the passage opening of the top plate.
- the contact tongue carrier can always be arranged in an advantageous manner, regardless of the thickness of the sealing disk, so that a predetermined actuator length can be maintained exactly. This simplifies the manufacturing process and reduces the manufacturing costs for the actuator.
- An object of the present invention is to provide an injection system with a arranged in the high-pressure chamber piezoelectric actuator, which ensures a hermetic and especially long-term stable sealing of the actuator interior, in particular in the field of implementation of the contact device.
- Another task is to ensure a temperature-stable sealing of the actuator interior.
- One advantage of the present invention is that the actuator interior space relative to the housing interior or high-pressure chamber the injection system is hermetically sealed, so that no mass transfer between the actuator interior and the housing interior can take place.
- the injection system of the present invention provides a function separation which ensures the hermetic seal of the actuator interior.
- the sealing of the fuel with the fuel pressure of for example 2000 bar (first function) with respect to the outside space with external space pressure, for example atmospheric pressure, is provided by the first sealing device.
- the first sealing device therefore has to seal a pressure difference of almost 2000 bar.
- the first sealing device does not necessarily have to ensure a hermetic seal, as fuel is always fed at 2000 bar.
- the second function namely the sealing of the actuator interior with respect to the housing interior, is provided by the second sealing device.
- In the interior of the housing there is a fuel pressure of, for example, 2000 bar, which is transmitted to the piezo stack by means of the transmission medium, which contains the fluid with the fluid pressure.
- the housing interior and the actuator interior pressure differences which are very small compared to the pressure differences between housing interior and exterior and can be for example a maximum of 200 bar.
- These pressure differences are particularly dependent on the embodiment of the envelope, for example as a corrugated pipe.
- the second sealing device only has to seal off partial pressure differences which can amount to at most 200 bar. Due to the small pressure differences, which has to seal the second sealing device, the actuator interior is hermetically sealed. In particular, this tightness can be ensured even for long periods of operation, and in particular for operating temperatures and temperature differences.
- the transmission means is adapted to transfer the externally applied to the envelope fuel pressure to the piezoelectric stack.
- controllable piezo stack provides a stroke as a function of a control voltage for actuating a nozzle needle.
- the first contact device and the second contact device contact the piezo stack for controlling the piezo stack.
- the first contact device contacts a first outer electrode of the piezoelectric stack and the second contact device contacts a second outer electrode of the piezoelectric stack.
- the first contact device is set to a first electrical potential and the second contact device is set to a second electrical potential.
- the first contact device is connected to a positive pole of a power supply and the second contact device is connected to a negative pole of the power supply. The difference between the first electrical potential and the second electrical potential forms the control voltage.
- the actuator interior is limited by the bottom plate, the top plate, the envelope and by the piezo stack.
- the housing has a supply device for supplying the fuel with the predetermined fuel pressure into the housing interior.
- the first sealing device has a first O-ring-shaped sealing element, which sealingly surrounds the first contact device in the region of the first housing passage, and a second O-ring-shaped sealing element, which the second contact device in the region of the second housing passage sealingly surrounding.
- the first O-ring-shaped sealing element and / or the second O-ring-shaped sealing element are / is formed from a plastic, in particular from an elastomer.
- the second sealing device has a first sealing element, which sealingly surrounds the first contact device in the region of the first head plate passage, and a second sealing element, which sealingly surrounds the second contact device in the region of the second head plate passage.
- the first sealing element and / or the second sealing element consist of a glass.
- Glass as a sealing element between the actuator interior and the housing interior has the advantageous property of being very temperature stable. Thus, the tightness of the actuator interior is ensured even at extreme temperature fluctuations and / or very long loads at high temperature.
- the fuel pressure in the housing interior is greater than 1500 bar, in particular greater than 2000 bar.
- a pressure difference arises between the fuel pressure and the fluid pressure in the actuator interior, which is less than or equal to 200 bar.
- a pressure difference of 200 bar results only in extreme conditions, so that in general the fuel pressure and the fluid pressure are almost equal.
- there is a partial pressure difference between the fuel pressure and the fluid pressure which is generally close to zero, so that glass can be used as a hermetically sealing sealant between the actuator interior and the housing interior due to the hermetic sealing function separation of the present invention and the sealing of the fuel pressure against atmospheric pressure.
- the transfer means comprises the liquid and at least one preformed body, which in particular consists of a ceramic.
- the sheath is formed as a corrugated tube, which has a plurality of waves and in particular is metallic.
- the liquid is temperature-resistant and / or thermally conductive and / or electrically insulating.
- the liquid is temperature resistant, so that temperature fluctuations do not affect the properties of the liquid.
- the liquid is also thermally conductive, so that no significant differences in the expansion of the sheath and the piezo stack can occur at a temperature change.
- the liquid is also preferably electrically insulating, so that no electrical flashover between the outer electrode of the piezoelectric stack and the metallic coating can arise.
- the liquid is a silicone oil.
- the injection system is a common-rail injection system.
- Fig. 1 is a schematic longitudinal sectional view of a preferred embodiment of the injection system 1 of the invention for injecting fuel K with a predetermined fuel pressure P1 in a nozzle or a valve (not shown) shown.
- the injection system 1 has a housing 2 which has a housing interior 3, which contains the fuel K, a first housing passage 4 for passing through a first contact device 5 and a second housing passage 6 for carrying out a second contact device 7.
- a piezoelectric actuator 8 is arranged in the housing interior 3.
- the piezoelectric actuator 8 has a top plate 9, a bottom plate 10, a piezo stack 11 and an envelope 14.
- the top plate 9 has a first head plate passage 12 for passing the first contact device 5 and a second head plate passage 13 for passing the second contact device 7.
- the piezo stack 11 is controllable by means of a control voltage U and arranged between the top plate 9 and the bottom plate 10.
- the controllable piezo stack 11 provides a lift in response to the control voltage U for actuating a nozzle needle (not shown).
- the sheath 14 is preferably formed as a corrugated tube having a plurality of shafts and in particular is metallic.
- the top plate 9, the bottom plate 10, the sheath 14 and the piezo stack 11 define an actuator interior 15.
- a transmission means 16 is arranged, which is adapted to the externally applied to the enclosure 14 fuel pressure P1 to transfer to the piezo stack 11.
- the transmission means 17 at least one liquid F with a liquid pressure P2.
- the fuel pressure P1 is preferably greater than 1500 bar, in particular greater than 2000 bar.
- the liquid pressure P2 is transmitted to the transfer element 16, so that the liquid pressure P2 substantially corresponds to the fuel pressure P1.
- the pressure difference between the fuel pressure P1 and the fluid pressure P2 is at most 200 bar.
- the liquid F is temperature-resistant and / or thermally conductive and / or electrically insulating.
- the liquid F is a silicone oil.
- the first contact device 5 is guided through the first housing passage 4 and the first head plate passage 12.
- the second contact device 7 is guided through the second housing passage 6 and the second head plate passage 13.
- the two contact devices 5, 7 are in particular made of metal or invar.
- the first contact device 5 and the second contact device 7 contact the piezo stack 11 for its control.
- the first contact device 5 is set to a first electrical potential PT1 and the second contact device 7 is set to a second electrical potential PT2, wherein the difference between the first electrical potential PT1 and the second electric potential PT2, the control voltage U is formed.
- the injection system 1 has a first sealing device 17a, 17b, which surrounds the contact devices 5, 7 in the region of the housing passages 4, 6 and provides a seal between the housing interior 3 and an outer space 18 with a predetermined outside pressure P3.
- the outdoor pressure P3 is, for example, the atmospheric pressure.
- the first sealing device 17a, 17b has a first O-ring-shaped sealing element 17a, which sealingly surrounds the first contact device 5 in the region of the first housing passage 4, and a second O-ring-shaped sealing element 17b, which surrounds the second contact device 7 in the region of the second housing passage 6 sealingly surrounds.
- the O-ring-shaped sealing elements 17a, 17b are formed, for example, from plastic, in particular from an elastomer.
- the injection system 1 has a second sealing device 19a, 19b, which surrounds the contact devices 5, 7 in the region of the head plate passages 12, 13 and provides a seal between the housing interior 3 and the actuator interior 15.
- the second sealing device 19a, 19b has a first sealing element 19a, which sealingly surrounds the first contact device 5 in the region of the first head plate passage 12, and a second sealing element 19b, which sealingly surrounds the second contact device 7 in the region of the second head plate passage 12.
- the sealing elements 19a, 19b are made of glass, in particular for reasons of temperature stability.
- the housing 2 has a feed device 20, by means of which the fuel K with the predetermined fuel pressure P1 in the housing interior 3 is supplied.
- the feeder 20 is formed, for example, as a nozzle.
- the method according to the invention has the following method steps af:
- a housing 2 which has a housing interior 3, which has the fuel K, a first housing passage 4 and a second housing passage 6.
- a piezoelectric actuator 8 is arranged in the housing interior 3.
- the piezoelectric actuator 8 has a head plate 9 which has a first head plate passage 12 and a second head plate passage 13, a controllable piezo stack 11 arranged between the head plate 9 and a bottom plate 10, arranged between the head plate 9 and the bottom plate 10, at least the piezo stack 11 laterally surrounding, sealed enclosure 14 and a arranged in an actuator interior 15 transfer means 16, which has at least one liquid with a liquid pressure P2.
- a first contact device 5 is arranged through the first housing passage 4 and the first head plate passage 12.
- a second contact device 7 is arranged through the second housing passage 6 and the second head plate passage 13.
- the housing interior 3 is sealed off from an exterior space 18 with a predetermined outside pressure P3 by means of a first sealing device 17a, 17b, wherein the first sealing device 17a, 17b surrounds the contact devices 5, 7 in the region of the housing passages 4, 6.
- the actuator interior 15 is sealed relative to the housing interior 3 by means of a second sealing device 19a, 19b, the sealing device 19a, 19b surrounding the contact devices 5, 7 in the region of the head plate passages 12, 13.
- the piezo stack can be cylindrical or square.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung betrifft ein Einspritzsystem mit einem im Hochdruckraum angeordneten Piezo-Aktor und ein Verfahren zum Herstellen eines solchen Einspritzsystems.The invention relates to an injection system with a piezoactuator arranged in the high-pressure chamber and to a method for producing such an injection system.
Einspritzsysteme und insbesondere lecköllose Common-Rail-Einspritzsysteme erfordern ein Steuerelement, wie beispielsweise einen Piezo-Aktor im Hochdruckraum. Um die Arbeitsfähigkeit des Piezo-Aktors auch unter hohen Drücken bis über 2000 bar zu gewährleisten, muss der Druck auch seitlich auf den Piezo-Stapel beziehungsweise Piezo-Keramikkörper wirken können, um die Dehnungsfähigkeit des Piezo-Stapels des Piezo-Aktors zu unterstützen.Injection systems and in particular leak-less common rail injection systems require a control element, such as a piezo actuator in the high-pressure space. In order to ensure the operability of the piezo actuator even at high pressures up to 2000 bar, the pressure must also be able to act laterally on the piezo stack or piezo ceramic body in order to support the extensibility of the piezo stack of the piezo actuator.
Ein solcher Piezo-Aktor ist beispielsweise in der
Außerdem ist der Anmelderin zur Übertragung des Druckes auf den Piezo-Stapel des Piezo-Aktors intern eine Lösung mit einer hermetisch dichten, metallischen Hülse bekannt, die zwischen dem Piezo-Stapel und der Hülse einen Aktor-Innenraum bereitstellt. In dem Aktor-Innenraum wird ein Füllstoff, z.B. ein Silikonöl, zur Übertragung der hydraulischen Kräfte auf die Seitenflächen des Piezo-Keramikkörpers vorgesehen. Diese der Anmelderin intern bekannte Lösung hat allerdings den Nachteil, dass die Abdichtung zwischen dem Piezo-Stapel und der Hülse an der Stelle, an welcher eine elektrische Pindurchführung oder Kontaktvorrichtung zur Kontaktierung und Steuerung des Piezo-Stapels durch die Abdichtung geführt ist, nicht bei längeren Betriebsdauern und insbesondere nicht bei hohen Drücken, wie 2000 bar, hermetisch dicht bleibt. Somit besteht bei einer Undichtheit die Gefahr, dass der Füllstoff aus dem Aktor-Innenraum austreten könnte. Ein Austreten des Füllstoffs könnte den Piezo-Aktor und damit das Einspritzsystem betriebsunfähig machen.In addition, the applicant for transferring the pressure on the piezo stack of the piezo actuator internally known a solution with a hermetically sealed, metallic sleeve, which provides an actuator interior space between the piezo stack and the sleeve. In the actuator interior, a filler, e.g. a silicone oil, provided for transmitting the hydraulic forces to the side surfaces of the piezoelectric ceramic body. However, this internally known to the Applicant solution has the disadvantage that the seal between the piezo-stack and the sleeve at the point at which an electric pin feedthrough or contact device for contacting and controlling the piezoelectric stack is passed through the seal, not at longer Operating periods and especially not at high pressures, such as 2000 bar, hermetically sealed. Thus, there is a risk in a leak that the filler could escape from the actuator interior. A leakage of the filler could make the piezo actuator and thus the injection system inoperable.
Die Druckschrift
Die Druckschrift
Eine Aufgabe der vorliegenden Erfindung besteht daher darin, ein Einspritzsystem mit einem im Hochdruckraum angeordneten Piezo-Aktor bereitzustellen, das eine hermetische und insbesondere langzeitstabile Abdichtung des Aktor-Innenraums, insbesondere im Bereich der Durchführung der Kontaktvorrichtung, sicherstellt.An object of the present invention is to provide an injection system with a arranged in the high-pressure chamber piezoelectric actuator, which ensures a hermetic and especially long-term stable sealing of the actuator interior, in particular in the field of implementation of the contact device.
Eine weitere Aufgabe ist es, eine temperaturstabile Abdichtung des Aktor - Innenraums sicherzustellen.Another task is to ensure a temperature-stable sealing of the actuator interior.
Erfindungsgemäß wird zumindest eine dieser gestellten Aufgaben durch ein Einspritzsystem mit den Merkmalen des Patentanspruchs 1 und/oder durch ein Verfahren zum Herstellen eines Einspritzsystems mit den Merkmalen des Patentanspruchs 18 gelöst.According to the invention, at least one of these objects is achieved by an injection system having the features of the patent claim 1 and / or solved by a method for producing an injection system with the features of claim 18.
Demnach wird erfindungsgemäß ein Einspritzsystem zum Einspritzen von Kraftstoff mit einem vorbestimmten Kraftstoffdruck vorgeschlagen, das aufweist:
- ein Gehäuse, welches einen Gehäuseinnenraum, der den Kraftstoff aufweist, einen ersten Gehäusedurchlass und einen zweiten Gehäusedurchlass aufweist,
- einen in dem Gehäuseinnenraum angeordneten Piezo-Aktor, der eine Kopfplatte, welche einen ersten Kopfplattendurchlass und einen zweiten Kopfplattendurchlass aufweist, einen zwischen der Kopfplatte und der Bodenplatte angeordneten, steuerbaren Piezo-Stapel, eine zwischen der Kopfplatte und der Bodenplatte angeordnete, zumindest den Piezo-Stapel seitlich umgebende, dichte Umhüllung und ein in einem Aktor-Innenraum angeordnetes Übertragungsmittel aufweist, welches zumindest eine Flüssigkeit mit einem Flüssigkeitsdruck aufweist,
- eine erste Kontaktvorrichtung, welche durch den ersten Gehäusedurchlass und den ersten Kopfplattendurchlass geführt ist,
- eine zweite Kontaktvorrichtung, welche durch den zweiten Gehäusedurchlass und den zweiten Kopfplattendurchlass geführt ist,
- eine erste Abdichtvorrichtung, welche die Kontaktvorrichtungen im Bereich der Gehäusedurchlässe umgibt und eine Abdichtung zwischen dem Gehäuseinnenraum und einem Außenraum mit einem vorbestimmten Außenraumdruck, beispielsweise Atmosphärendruck, bereitstellt, und
- eine zweite Abdichtvorrichtung, welche die Kontaktvorrichtungen im Bereich der Kopfplattendurchlässe umgibt und eine Abdichtung zwischen dem Gehäuseinnenraum und dem Aktor-Innenraum bereitstellt, wobei die zweite Abdichtvorrichtung (19y, 19b) ein erstes Abdichtelement (19a), welches die erste Kontaktvorrichtungen (5)im Bereich des ersten Kopfplattendurchlasses (12) abdichtend umgibt, und ein zweites Abdichtelement (19b) aufweist, welches die zweite Kontaktvorrichtung (7) im Bereich des zweiten Kopfplattendurchlasses (12) abdichtend umgibt, wobei das erste Abdichtelement (19a) und/oder das zweite Abdichtelement (19b) aus einem Glas bestehen.
- a housing having a housing interior containing the fuel, a first housing passage and a second housing passage,
- a arranged in the housing interior piezoelectric actuator having a head plate, which has a first head plate passage and a second head plate passage, arranged between the top plate and the bottom plate, controllable piezo stack, arranged between the top plate and the bottom plate, at least the piezoelectric Stack laterally surrounding, dense enclosure and arranged in an actuator interior transmission means having at least one liquid with a liquid pressure,
- a first contact device which is guided through the first housing passage and the first head plate passage,
- a second contact device which is guided through the second housing passage and the second head plate passage,
- a first sealing device, which surrounds the contact devices in the region of the housing passages and a seal between the housing interior and an outer space with a predetermined outdoor pressure, for example atmospheric pressure, provides, and
- a second sealing device, which surrounds the contact devices in the region of the head plate passages and a seal between the housing interior and the actuator interior, wherein the second sealing device (19y, 19b) sealingly surrounds a first sealing element (19a), which surrounds the first contact devices (5) in the region of the first head plate passage (12), and a second Sealing element (19b) which sealingly surrounds the second contact device (7) in the region of the second head plate passage (12), wherein the first sealing element (19a) and / or the second sealing element (19b) consist of a glass.
Ein Vorteil der vorliegenden Erfindung besteht darin, dass der Aktor-Innenraum gegenüber dem Gehäuseinnenraum oder Hochdruckraum des Einspritzsystems hermetisch dicht ist, so dass kein Stoffaustausch zwischen dem Aktor-Innenraum und dem Gehäuseinnenraum stattfinden kann.One advantage of the present invention is that the actuator interior space relative to the housing interior or high-pressure chamber the injection system is hermetically sealed, so that no mass transfer between the actuator interior and the housing interior can take place.
Das Einspritzsystem der vorliegenden Erfindung stellt eine Funktionstrennung bereit, welche die hermetische Abdichtung des Aktor-Innenraums sicherstellt. Die Abdichtung des Kraftstoffs mit dem Kraftstoffdruck von beispielsweise 2000 bar (erste Funktion) gegenüber dem Außenraum mit Außenraumdruck, beispielsweise Atmosphärendruck, wird durch die erste Abdichtvorrichtung bereitgestellt. Die erste Abdichtvorrichtung hat demnach einen Druckunterschied von nahezu 2000 bar abzudichten. Allerdings muss die erste Abdichtvorrichtung nicht unbedingt eine hermetische Abdichtung sicherstellen, da Kraftstoff stets mit 2000 bar nachgeführt wird. Die zweite Funktion, nämlich das Abdichten des Aktor-Innenraums gegenüber dem Gehäuseinnenraum, wird durch die zweite Abdichtvorrichtung bereitgestellt. Im Gehäuseinnenraum herrscht ein Kraftstoffdruck von beispielsweise 2000 bar, der mittels des Übertragungsmittels, das die Flüssigkeit mit dem Flüssigkeitsdruck beinhaltet, auf den Piezo-Stapel übertragen wird. Folglich herrschen zwischen dem Gehäuseinnenraum und dem Aktor-Innenraum Druckunterschiede, die im Vergleich zu den Druckunterschieden zwischen Gehäuseinnenraum und Außenraum sehr klein sind und beispielsweise maximal 200 bar betragen können. Diese Druckunterschiede sind insbesondere von der Ausgestaltungsform der Umhüllung, beispielsweise als Wellrohr, abhängig. Somit hat die zweite Abdichtvorrichtung im Gegensatz zur ersten Abdichtvorrichtung nur Partialdruckunterschiede, die allenfalls 200 bar betragen können, abzudichten. Infolge der geringen Druckunterschiede, welche die zweite Abdichtvorrichtung abzudichten hat, ist der Aktor-Innenraum hermetisch dicht. Insbesondere kann diese Dichtheit auch für lange Betriebsdauern, und insbesondere für beim Betrieb auftretende Temperaturen und Temperaturunterschiede sichergestellt werden.The injection system of the present invention provides a function separation which ensures the hermetic seal of the actuator interior. The sealing of the fuel with the fuel pressure of for example 2000 bar (first function) with respect to the outside space with external space pressure, for example atmospheric pressure, is provided by the first sealing device. The first sealing device therefore has to seal a pressure difference of almost 2000 bar. However, the first sealing device does not necessarily have to ensure a hermetic seal, as fuel is always fed at 2000 bar. The second function, namely the sealing of the actuator interior with respect to the housing interior, is provided by the second sealing device. In the interior of the housing there is a fuel pressure of, for example, 2000 bar, which is transmitted to the piezo stack by means of the transmission medium, which contains the fluid with the fluid pressure. Consequently prevail between the housing interior and the actuator interior pressure differences, which are very small compared to the pressure differences between housing interior and exterior and can be for example a maximum of 200 bar. These pressure differences are particularly dependent on the embodiment of the envelope, for example as a corrugated pipe. Thus, in contrast to the first sealing device, the second sealing device only has to seal off partial pressure differences which can amount to at most 200 bar. Due to the small pressure differences, which has to seal the second sealing device, the actuator interior is hermetically sealed. In particular, this tightness can be ensured even for long periods of operation, and in particular for operating temperatures and temperature differences.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen sowie der Beschreibung unter Bezugnahme auf die Zeichnungen.Advantageous embodiments and modifications of the invention will become apparent from the dependent claims and the description with reference to the drawings.
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist das Übertragungsmittel dazu geeignet, den außen an der Umhüllung anliegenden Kraftstoffdruck auf den Piezo-Stapel zu übertragen.According to a preferred embodiment of the invention, the transmission means is adapted to transfer the externally applied to the envelope fuel pressure to the piezoelectric stack.
Gemäß einer bevorzugten Weiterbildung der Erfindung stellt der steuerbare Piezo-Stapel einen Hub in Abhängigkeit einer Steuerspannung zum Betätigen einer Düsennadel bereit.According to a preferred embodiment of the invention, the controllable piezo stack provides a stroke as a function of a control voltage for actuating a nozzle needle.
Gemäß einer weiteren bevorzugten Weiterbildung kontaktieren die erste Kontaktvorrichtung und die zweite Kontaktvorrichtung den Piezo-Stapel zur Steuerung des Piezo-Stapels. Dabei kontaktiert beispielsweise die erste Kontaktvorrichtung eine erste Außenelektrode des Piezo-Stapels und die zweite Kontaktvorrichtung kontaktiert eine zweite Außenelektrode des Piezo-Stapels. Zur Steuerung des Piezo-Stapels wird die erste Kontaktvorrichtung auf ein erstes elektrisches Potenzial und die zweite Kontaktvorrichtung auf ein zweites elektrisches Potenzial gesetzt. Dazu ist beispielweise die erste Kontaktvorrichtung mit einem Pluspol einer Spannungsversorgung und die zweite Kontaktvorrichtung mit einem Minuspol der Spannungsversorgung verbunden. Die Differenz zwischen dem ersten elektrischen Potenzial und dem zweiten elektrischen Potenzial bildet die Steuerspannung aus.According to a further preferred development, the first contact device and the second contact device contact the piezo stack for controlling the piezo stack. In this case, for example, the first contact device contacts a first outer electrode of the piezoelectric stack and the second contact device contacts a second outer electrode of the piezoelectric stack. For controlling the piezo stack, the first contact device is set to a first electrical potential and the second contact device is set to a second electrical potential. For this purpose, for example, the first contact device is connected to a positive pole of a power supply and the second contact device is connected to a negative pole of the power supply. The difference between the first electrical potential and the second electrical potential forms the control voltage.
Gemäß einer weiteren bevorzugten Ausgestaltung ist der Aktor-Innenraum durch die Bodenplatte, die Kopfplatte, die Umhüllung und durch den Piezo-Stapel begrenzt.According to a further preferred embodiment, the actuator interior is limited by the bottom plate, the top plate, the envelope and by the piezo stack.
Gemäß einer weiteren bevorzugten Weiterbildung weist das Gehäuse eine Zufuhrvorrichtung zum Zuführen des Kraftstoffs mit dem vorbestimmten Kraftstoffdruck in den Gehäuseinnenraum auf.According to a further preferred development, the housing has a supply device for supplying the fuel with the predetermined fuel pressure into the housing interior.
Gemäß einer weiteren bevorzugten Ausgestaltung weist die erste Abdichtvorrichtung ein erstes O-Ring-förmiges Dichtelement, welches die erste Kontaktvorrichtung im Bereich des ersten Gehäusedurchlasses abdichtend umgibt, und ein zweites O-Ring-förmiges Dichtelement auf, welches die zweite Kontaktvorrichtung im Bereich des zweiten Gehäusedurchlasses abdichtend umgibt.According to a further preferred embodiment, the first sealing device has a first O-ring-shaped sealing element, which sealingly surrounds the first contact device in the region of the first housing passage, and a second O-ring-shaped sealing element, which the second contact device in the region of the second housing passage sealingly surrounding.
Gemäß einer weiteren bevorzugten Ausgestaltung sind/ist das erste O-Ring-förmige Dichtelement und/oder das zweite O-Ring-förmige Dichtelement aus einem Kunststoff, insbesondere aus einem Elastomer, ausgebildet.According to a further preferred embodiment, the first O-ring-shaped sealing element and / or the second O-ring-shaped sealing element are / is formed from a plastic, in particular from an elastomer.
Gemäß einer weiteren bevorzugten Ausgestaltung weist die zweite Abdichtvorrichtung ein erstes Abdichtelement, welches die erste Kontaktvorrichtung im Bereich des ersten Kopfplattendurchlasses abdichtend umgibt, und ein zweites Abdichtelement auf, welches die zweite Kontaktvorrichtung im Bereich des zweiten Kopfplattendurchlasses dichtend umgibt.According to a further preferred embodiment, the second sealing device has a first sealing element, which sealingly surrounds the first contact device in the region of the first head plate passage, and a second sealing element, which sealingly surrounds the second contact device in the region of the second head plate passage.
Gemäß einer weiteren bevorzugten Ausgestaltung bestehen das erste Abdichtelement und/oder das zweite Abdichtelement aus einem Glas. Glas als Abdichtelement zwischen dem Aktor-Innenraum und dem Gehäuseinnenraum hat die vorteilhafte Eigenschaft, sehr temperaturstabil zu sein. Damit wird die Dichtheit des Aktor-Innenraums selbst bei extremen Temperaturschwankungen und/oder sehr langen Belastungen bei hoher Temperatur sichergestellt.According to a further preferred embodiment, the first sealing element and / or the second sealing element consist of a glass. Glass as a sealing element between the actuator interior and the housing interior has the advantageous property of being very temperature stable. Thus, the tightness of the actuator interior is ensured even at extreme temperature fluctuations and / or very long loads at high temperature.
Gemäß einer weiteren bevorzugten Ausgestaltung ist der Kraftstoffdruck im Gehäuseinnenraum größer als 1500 bar, insbesondere größer als 2000 bar.According to a further preferred embodiment, the fuel pressure in the housing interior is greater than 1500 bar, in particular greater than 2000 bar.
Gemäß einer weiteren bevorzugten Ausgestaltung entsteht bei der Übertragung des Kraftstoffdruckes auf den Piezo-Stapel ein Druckunterschied zwischen dem Kraftstoffdruck und dem Flüssigkeitsdruck im Aktor-Innenraum, der kleiner oder gleich 200 bar ist. Ein Druckunterschied von 200 bar ergibt sich nur bei extremen Randbedingungen, so dass im Allgemeinen der Kraftstoffdruck und der Flüssigkeitsdruck nahezu gleich sind. Somit existiert ein Partialdruckunterschied zwischen dem Kraftstoffdruck und dem Flüssigkeitsdruck, der im Allgemeinen nahezu Null ist, so dass infolge der erfindungsgemäßen Funktionstrennung von hermetischer Abdichtung und der Abdichtung des Kraftstoffdruckes gegen Atmosphärendruck Glas als hermetisch abdichtendes Dichtmittel zwischen Aktor-Innenraum und Gehäuseinnenraum verwendet werden kann.According to a further preferred embodiment, when the fuel pressure is transferred to the piezoelectric stack, a pressure difference arises between the fuel pressure and the fluid pressure in the actuator interior, which is less than or equal to 200 bar. A pressure difference of 200 bar results only in extreme conditions, so that in general the fuel pressure and the fluid pressure are almost equal. Thus, there is a partial pressure difference between the fuel pressure and the fluid pressure which is generally close to zero, so that glass can be used as a hermetically sealing sealant between the actuator interior and the housing interior due to the hermetic sealing function separation of the present invention and the sealing of the fuel pressure against atmospheric pressure.
Gemäß einer weiteren bevorzugten Weiterbildung weist das Übertragungsmittel die Flüssigkeit und zumindest einen vorgeformten Körper, der insbesondere aus einer Keramik besteht, auf.According to a further preferred development, the transfer means comprises the liquid and at least one preformed body, which in particular consists of a ceramic.
Gemäß einer weiteren bevorzugten Ausgestaltung ist die Umhüllung als ein Wellrohr ausgebildet, welches eine Vielzahl von Wellen aufweist und insbesondere metallisch ist.According to a further preferred embodiment, the sheath is formed as a corrugated tube, which has a plurality of waves and in particular is metallic.
Gemäß einer weiteren bevorzugten Ausgestaltung ist die Flüssigkeit temperaturbeständig und/oder wärmeleitend und/oder elektrisch isolierend. Vorteilhafterweise ist die Flüssigkeit temperaturbeständig, so dass sich Temperaturschwankungen nicht auf die Eigenschaften der Flüssigkeit auswirken. Vorteilhafterweise ist die Flüssigkeit auch wärmeleitend, so dass keine wesentlichen Dehnungsunterschiede bei der Umhüllung und dem Piezo-Stapel bei einer Temperaturänderung auftreten können. Weiterhin ist die Flüssigkeit auch vorzugsweise elektrisch isolierend, so dass kein elektrischer Überschlag zwischen der Außenelektrode des Piezo-Stapels und der metallischen Umhüllung entstehen kann. Vorzugsweise ist die Flüssigkeit ein Silikonöl.According to a further preferred embodiment, the liquid is temperature-resistant and / or thermally conductive and / or electrically insulating. Advantageously, the liquid is temperature resistant, so that temperature fluctuations do not affect the properties of the liquid. Advantageously, the liquid is also thermally conductive, so that no significant differences in the expansion of the sheath and the piezo stack can occur at a temperature change. Furthermore, the liquid is also preferably electrically insulating, so that no electrical flashover between the outer electrode of the piezoelectric stack and the metallic coating can arise. Preferably, the liquid is a silicone oil.
Gemäß einer weiteren bevorzugten Ausgestaltung ist das Einspritzsystem ein Common-Rail-Einspritzsystem.According to a further preferred embodiment, the injection system is a common-rail injection system.
Die Erfindung wird nachfolgend anhand der in den schematischen Figuren der angegebenen Ausführungsbeispiele näher erläutert. Es zeigen:
- Fig. 1
- eine schematische Längsschnittansicht eines bevorzugten Ausführungsbeispiels des erfindungsgemäßen Einspritzsystems; und
- Fig. 2
- ein schematisches Ablaufdiagramm des erfindungsgemäßen Verfahrens zur Herstellung eines Einspritzsystems.
- Fig. 1
- a schematic longitudinal sectional view of a preferred embodiment of the injection system according to the invention; and
- Fig. 2
- a schematic flow diagram of the inventive method for producing an injection system.
In allen Figuren sind gleiche bzw. funktionsgleiche Elemente und Einheiten - sofern nichts anderes angegeben ist - mit denselben Bezugszeichen versehen worden.In all figures, the same or functionally identical elements and units - unless otherwise indicated - have been given the same reference numerals.
In
Das Einspritzsystem 1 weist ein Gehäuse 2 auf, das einen Gehäuseinnenraum 3, der den Kraftstoff K beinhaltet, einen ersten Gehäusedurchlass 4 zur Durchführung einer ersten Kontaktvorrichtung 5 und einen zweiten Gehäusedurchlass 6 zur Durchführung einer zweiten Kontaktvorrichtung 7 aufweist.The injection system 1 has a
In dem Gehäuseinnenraum 3 ist ein Piezo-Aktor 8 angeordnet. Der Piezo-Aktor 8 weist eine Kopfplatte 9, eine Bodenplatte 10, einen Piezo-Stapel 11 und eine Umhüllung 14 auf. Die Kopfplatte 9 hat einen ersten Kopfplattendurchlass 12 zur Durchführung der ersten Kontaktvorrichtung 5 und einen zweiten Kopfplattendurchlass 13 zur Durchführung der zweiten Kontaktvorrichtung 7. Der Piezo-Stapel 11 ist mittels einer Steuerspannung U steuerbar und zwischen der Kopfplatte 9 und der Bodenplatte 10 angeordnet. Der steuerbare Piezo-Stapel 11 stellt einen Hub in Abhängigkeit der Steuerspannung U zum Betätigen einer Düsennadel (nicht gezeigt) bereit.In the housing interior 3, a
Zwischen der Kopfplatte 9 und der Bodenplatte 10 ist eine zumindest den Piezo-Stapel 11 seitlich umgebende, dichte Umhüllung 14 angeordnet. Die Umhüllung 14 ist vorzugsweise als ein Wellrohr ausgebildet, das eine Vielzahl von Wellen aufweist und insbesondere metallisch ist.Between the
Die Kopfplatte 9, die Bodenplatte 10, die Umhüllung 14 und der Piezo-Stapel 11 begrenzen einen Aktor-Innenraum 15. In dem Aktor-Innenraum 15 ist ein Übertragungsmittel 16 angeordnet, welches dazu geeignet ist, den außen an der Umhüllung 14 anliegenden Kraftstoffdruck P1 auf den Piezo-Stapel 11 zu übertragen. Dazu weist das Übertragungsmittel 17 zumindest eine Flüssigkeit F mit einem Flüssigkeitsdruck P2 auf. Der Kraftstoffdruck P1 ist vorzugsweise größer als 1500 bar, insbesondere größer als 2000 bar. Bei der Übertragung des Kraftstoffdruckes P1 auf den Piezo-Stapel 11 wird der Druck auf das Übertragungselement 16 übertragen, so dass der Flüssigkeitsdruck P2 im Wesentlichen dem Kraftstoffdruck P1 entspricht. Der Druckunterschied zwischen dem Kraftstoffdruck P1 und dem Flüssigkeitsdruck P2 beträgt höchstens 200 bar. Insbesondere ist die Flüssigkeit F temperaturbeständig und/oder wärmeleitend und/oder elektrisch isolierend. Beispielsweise ist die Flüssigkeit F ein Silikonöl.The
Die erste Kontaktvorrichtung 5 wird durch den ersten Gehäusedurchlass 4 und den ersten Kopfplattendurchlass 12 geführt. Analog wird die zweite Kontaktvorrichtung 7 durch den zweiten Gehäusedurchlass 6 und den zweiten Kopfplattendurchlass 13 geführt. Die beiden Kontaktvorrichtungen 5, 7 sind insbesondere aus Metall oder Invar. Die erste Kontaktvorrichtung 5 und die zweite Kontaktvorrichtung 7 kontaktieren den Piezo-Stapel 11 zu dessen Steuerung. Dabei wird die erste Kontaktvorrichtung 5 auf ein erstes elektrisches Potenzial PT1 und die zweite Kontaktvorrichtung 7 auf ein zweites elektrisches Potenzial PT2 gesetzt, wobei die Differenz zwischen dem ersten elektrischen Potenzial PT1 und dem zweiten elektrischen Potenzial PT2 die Steuerspannung U ausbildet.The
Weiter weist das Einspritzsystem 1 eine erste Abdichtvorrichtung 17a, 17b auf, welche die Kontaktvorrichtungen 5, 7 im Bereich der Gehäusedurchlässe 4, 6 umgibt und eine Abdichtung zwischen dem Gehäuseinnenraum 3 und einem Außenraum 18 mit einem vorbestimmten Außenraumdruck P3 bereitstellt. Der Außenraumdruck P3 ist beispielsweise der Atmosphärendruck.Furthermore, the injection system 1 has a
Die erste Abdichtvorrichtung 17a, 17b weist ein erstes O-Ring-förmiges Dichtelement 17a, welches die erste Kontaktvorrichtung 5 im Bereich des ersten Gehäusedurchlasses 4 abdichtend umgibt, und ein zweites O-Ring-förmiges Dichtelement 17b auf, welches die zweite Kontaktvorrichtung 7 im Bereich des zweiten Gehäusedurchlasses 6 abdichtend umgibt. Die O-Ringförmigen Dichtelemente 17a, 17b sind beispielsweise aus Kunststoff, insbesondere aus einem Elastomer ausgebildet.The
Weiterhin weist das Einspritzsystem 1 eine zweite Abdichtvorrichtung 19a, 19b auf, welche die Kontaktvorrichtungen 5, 7 im Bereich der Kopfplattendurchlässe 12, 13 umgibt und eine Abdichtung zwischen dem Gehäuseinnenraum 3 und dem Aktor-Innenraum 15 bereitstellt. Die zweite Abdichtvorrichtung 19a, 19b weist ein erstes Abdichtelement 19a, welches die erste Kontaktvorrichtung 5 im Bereich des ersten Kopfplattendurchlasses 12 abdichtend umgibt, und ein zweites Abdichtelement 19b auf, welches die zweite Kontaktvorrichtung 7 im Bereich des zweiten Kopfplattendurchlasses 12 abdichtend umgibt. Die Abdichtelemente 19a, 19b sind insbesondere aus Gründen der Temperaturstabilität aus Glas.Furthermore, the injection system 1 has a
Außerdem weist das Gehäuse 2 eine Zuführvorrichtung 20 auf, mittels welcher der Kraftstoff K mit dem vorbestimmten Kraftstoffdruck P1 in den Gehäuseinnenraum 3 zugeführt wird. Die Zuführvorrichtung 20 ist beispielsweise als ein Stutzen ausgebildet. Weiter weist das Einspritzsystem 1 ein Kraftübertragungselement 21 auf, welches das Gehäuse 2 mit dem Piezo-Aktor 8 koppelt.In addition, the
Nachfolgend wird das erfindungsgemäße Verfahren zum Herstellen des Einspritzsystems 1 anhand des Blockschaltbildes in
Es wird ein Gehäuse 2 bereitgestellt, welches einen Gehäuseinnenraum 3, der den Kraftstoff K aufweist, einen ersten Gehäusedurchlass 4 und einen zweiten Gehäusedurchlass 6 aufweist.A
In dem Gehäuseinnenraum 3 wird ein Piezo-Aktor 8 angeordnet. Der Piezo-Aktor 8 weist eine Kopfplatte 9, welche einen ersten Kopfplattendurchlass 12 und einen zweiten Kopfplattendurchlass 13 aufweist, einen zwischen der Kopfplatte 9 und einer Bodenplatte 10 angeordneten, steuerbaren Piezo-Stapel 11, eine zwischen der Kopfplatte 9 und der Bodenplatte 10 angeordnete, zumindest den Piezo-Stapel 11 seitlich umgebende, dichte Umhüllung 14 und ein in einem Aktor-Innenraum 15 angeordnetes Übertragungsmittel 16 auf, welches zumindest eine Flüssigkeit mit einem Flüssigkeitsdruck P2 aufweist.In the housing interior 3, a
Eine erste Kontaktvorrichtung 5 wird durch den ersten Gehäusedurchlass 4 und den ersten Kopfplattendurchlass 12 angeordnet.A
Eine zweite Kontaktvorrichtung 7 wird durch den zweiten Gehäusedurchlass 6 und den zweiten Kopfplattendurchlass 13 angeordnet.A
Der Gehäuseinnenraum 3 wird gegenüber einem Außenraum 18 mit einem vorbestimmten Außenraumdruck P3 mittels einer ersten Abdichtvorrichtung 17a, 17b abgedichtet, wobei die erste Abdichtvorrichtung 17a, 17b die Kontaktvorrichtungen 5, 7 im Bereich der Gehäusedurchlässe 4, 6 umgibt.The housing interior 3 is sealed off from an exterior space 18 with a predetermined outside pressure P3 by means of a
Der Aktor-Innenraum 15 wird gegenüber dem Gehäuseinnenraum 3 mittels einer zweiten Abdichtvorrichtung 19a, 19b abgedichtet, wobei die Abdichtvorrichtung 19a, 19b die Kontaktvorrichtungen 5, 7 im Bereich der Kopfplattendurchlässe 12, 13 umgibt.The
Obwohl die vorliegenden Erfindung vorstehend anhand der bevorzugten Ausführungsbeispiele beschrieben wurde, ist sie darauf nicht beschränkt, sondern auf vielfältige Art und Weise modifizierbar, wie in den beigefügten Ansprüchen definiert. Beispielsweise kann der Piezo-Stapel zylindrisch oder auch quadratisch ausgebildet sein.Although the present invention has been described above with reference to the preferred embodiments, it is not limited thereto but is modifiable in a variety of ways as defined in the appended claims. For example, the piezo stack can be cylindrical or square.
Claims (16)
- Injection system (1) for injecting fuel (K) with a predetermined fuel pressure (P1) having:a) a housing (2), which has a housing interior space (3), which comprises the fuel (K), a first housing aperture (4) and a second housing aperture (6);b) a piezo actuator (8) arranged in the housing interior space (3), which comprises:b1) a face plate (9), which comprises a first face plate aperture (12) and a second face plate aperture (13),b2) a controllable piezo stack (11) which is arranged between the face plate (9) and a base plate (10),b3) a sealed casing (14) which laterally surrounds at least the piezo stack (11) and is arranged between the face plate (9), and the base plate (10) andb4) a transmission means (16) which is arranged in an actuator interior space (15), said transmission means comprising at least one fluid with a fluid pressure (P2);
characterised byc) a first sealing device (17a,17b), which surrounds the contact devices (5, 7) in the region of the housing apertures (4, 6) and provides a seal between the housing interior space (3) and an exterior space (18) with a predetermined exterior space pressure (P3); and withd) a second sealing device (19a,19b), which surrounds the contact devices (5, 7) in the region of the face place apertures (12, 13) and provides a seal between the housing interior space (3) and the actuator interior space (15).e) a first contact device (5), which is guided through the first housing aperture (4) and the first face plate aperture (12);f) a second contact device (7), which is guided through the second housing aperture (6) and the second face plate aperture (13);g) with the second sealing device (19a,19b) having a first sealing element (19a), which surrounds the first contact device (5) in the region of the face plate aperture (12) in a sealed manner and having a second sealing element (19b), which surrounds the second contact device (7) in the region of the second face plate aperture (12) in a sealed manner, with the first sealing element (19a) and/or the second sealing element (19b) consisting of glass. - Injection system according to claim 1,
characterised in that
the transmission means (16) is suited to transmitting the fuel pressure (P1) which is present on the exterior of the casing (14) to the piezo stack (11). - Injection system according to claim 1 or 2,
characterised in that
the controllable piezo stack (11) provides a lift as a function of a control voltage (U) for actuating a nozzle needle. - Injection system according to claim 3,
characterised in that
the first contact device (5) and the second contact device (7) contact the piezo stack (11) to control the piezo stack (11), with the first contact device (5) being disposed on a first electrical potential (PT1) and the second contact device (7) being disposed on a second electrical potential (PT2), with the difference between the first electrical potential (PT1) and the second electrical potential (PT2) forming the control voltage (U). - Injection system according to one of the preceding claims,
characterised in that
the actuator interior space (15) is restricted by the face plate (9), the base plate (10), the casing (14) and by the piezo stack (11). - Injection system according to one of the preceding claims,
characterised in that
the housing (2) comprises a supply device (20) for supplying the fuel (K) with the predetermined fuel pressure (P1) into the housing interior space (3). - Injection system according to one of the preceding claims,
characterised in that
the first sealing device (17a, 17b) comprises a first O-ring-shaped sealing element (17a), which surrounds the first contact device (5) in the region of the first housing aperture (4) in a sealed manner, and a second O-ring-shaped sealing element (17b), which surrounds the second contact device (7) in the region of the second housing aperture (6) in a sealed manner. - Injection system according to claim 7,
characterised in that
the first O-ring-shaped sealing element (17a) and/or the second O-ring-shaped sealing element (17b) is/are designed from a plastic, in particular an elastomer. - Injection system according to one of the preceding claims,
characterised in that
the fuel pressure (P1) is greater than 1500 bar, in particular greater that 2000 bar. - Injection system according to one of the preceding claims,
characterised in that
with the transmission of the fuel pressure (P1) to the piezo stack (11) a pressure difference between the fuel pressure (P1) and the fluid pressure (P2) in the actuator interior space (15) is produced, which is less than or equal to 200 bar. - Injection system according to one of the preceding claims,
characterised in that
the transmission means (16) comprises the fluid (F) and at least one preformed body, which consist in particular of a ceramic. - Injection system according to one of the preceding claims,
characterised in that
the casing (14) is designed as a corrugated tube, which comprises a plurality of ripples and is in particular metallic. - Injection system according to one of the preceding claims,
characterised in that
the fluid (F) is temperature-resistant and/or heat-conductive and/or electrically-insulating. - Injection system according to claim 13,
characterised in that
the fluid (F) is designed as a silicon oil. - Injection system according to one of the preceding claims,
characterised in that
the injection system (1) is designed as a common rail injection system. - Method for producing an injection system (1) for injecting fuel (K) with a predetermined fuel pressure (P1) according to one or a number of preceding claims, having the steps:a) providing a housing (2), which has a housing interior space (3), which comprises the fuel (K), a first housing aperture (4) and a second housing aperture (6);b) arranging a piezo actuator (8) in the housing interior space (3), which has:b1) a face plate (9), which has a first face plate aperture (12) and a second face plate aperture (13),b2) a controllable piezo stack (11) which is arranged between the face plate (9) and a base plate (10),b3) a sealed casing (14) which laterally surrounds at least the piezo stack (11) and is arranged between the face plate (9) and the base plate (10) andb4) a transmission means (16) arranged in an actuator interior space (15), said transmission means (16) having at least one fluid with a fluid pressure (P2);c) sealing the housing interior space (3) in respect of an exterior space (18) with a predetermined exterior space pressure (P3) by means of a first sealing device (17a, 17b), which surrounds the contact devices (5, 7) in the region of the housing aperture (4, 6), andd) sealing the actuator interior space (15) in respect of the housing interior space (3) by means of a second sealing device (19a, 19b), which surrounds the contact devices (5, 7) in the region of the face plate apertures (12, 13),e) arranging a first contact device (5) through the first housing aperture (4) and the first face plate aperture (12);f) arranging a second contact device (7) through the second housing aperture (6) and the second face plate aperture (13);g) with the second sealing device (19, 19b) having a first sealing element (19a), which surrounds the first contact device (5) in the region of the face plate aperture (12) in a sealing fashion, and having a second sealing element (19b), which surrounds the second contact device (7) in the region of the second face plate aperture (12) in a sealed manner, with the first sealing element (19a) and/or the second sealing element (19b) consisting of glass.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06009556A EP1854992B1 (en) | 2006-05-09 | 2006-05-09 | Fuel injection system and method of manufacture |
DE502006007633T DE502006007633D1 (en) | 2006-05-09 | 2006-05-09 | Fuel injection system and a method of manufacturing this injection system |
US11/745,798 US8038079B2 (en) | 2006-05-09 | 2007-05-08 | Injection system and a method for producing an injection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06009556A EP1854992B1 (en) | 2006-05-09 | 2006-05-09 | Fuel injection system and method of manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1854992A1 EP1854992A1 (en) | 2007-11-14 |
EP1854992B1 true EP1854992B1 (en) | 2010-08-11 |
Family
ID=37022928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06009556A Expired - Fee Related EP1854992B1 (en) | 2006-05-09 | 2006-05-09 | Fuel injection system and method of manufacture |
Country Status (3)
Country | Link |
---|---|
US (1) | US8038079B2 (en) |
EP (1) | EP1854992B1 (en) |
DE (1) | DE502006007633D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014002184A1 (en) * | 2012-06-26 | 2014-01-03 | 三菱電機株式会社 | Equipment management system and program |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4471256A (en) * | 1982-06-14 | 1984-09-11 | Nippon Soken, Inc. | Piezoelectric actuator, and valve apparatus having actuator |
DE19932760A1 (en) * | 1999-07-14 | 2001-01-18 | Bosch Gmbh Robert | Fuel injector |
JP4356268B2 (en) * | 2000-06-26 | 2009-11-04 | 株式会社デンソー | Fuel injection device |
GB0102500D0 (en) * | 2001-02-01 | 2001-03-14 | Delphi Tech Inc | Method of assembling an actuator arrangement |
EP1511932B1 (en) * | 2002-04-04 | 2006-11-29 | Siemens Aktiengesellschaft | Injection valve |
DE10245109A1 (en) * | 2002-09-27 | 2004-04-08 | Siemens Ag | Fuel injector valve for diesel and petrol engines with piezoelectric actuator enclosed in cooling fluid |
DE10250202A1 (en) * | 2002-10-28 | 2004-05-13 | Siemens Ag | Actuator, especially for fuel injection valve, has contact pin passage sealed against plastic ingress during injection molding by plate covering upper side of head plate at least in passage area |
DE10259801A1 (en) * | 2002-12-19 | 2004-07-01 | Robert Bosch Gmbh | Fuel injector |
US7111500B2 (en) * | 2002-12-26 | 2006-09-26 | Ulvac Inc. | Analysis method using piezoelectric resonator |
US6983895B2 (en) * | 2003-10-09 | 2006-01-10 | Siemens Aktiengesellschaft | Piezoelectric actuator with compensator |
DE502004006919D1 (en) * | 2004-08-20 | 2008-06-05 | Vdo Automotive Ag | Actuator for a fuel injector of an internal combustion engine |
DE102004042353B4 (en) * | 2004-08-20 | 2008-10-09 | Continental Automotive Gmbh | Sealing arrangement of a piezoelectric actuator for a fuel injection valve of an internal combustion engine |
-
2006
- 2006-05-09 DE DE502006007633T patent/DE502006007633D1/en active Active
- 2006-05-09 EP EP06009556A patent/EP1854992B1/en not_active Expired - Fee Related
-
2007
- 2007-05-08 US US11/745,798 patent/US8038079B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US8038079B2 (en) | 2011-10-18 |
US20080001010A1 (en) | 2008-01-03 |
EP1854992A1 (en) | 2007-11-14 |
DE502006007633D1 (en) | 2010-09-23 |
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