EP1745210B1 - Nozzle assembly and injection valve - Google Patents
Nozzle assembly and injection valve Download PDFInfo
- Publication number
- EP1745210B1 EP1745210B1 EP05743039A EP05743039A EP1745210B1 EP 1745210 B1 EP1745210 B1 EP 1745210B1 EP 05743039 A EP05743039 A EP 05743039A EP 05743039 A EP05743039 A EP 05743039A EP 1745210 B1 EP1745210 B1 EP 1745210B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- recess
- nozzle needle
- axial end
- needle
- 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
- 238000002347 injection Methods 0.000 title claims description 26
- 239000007924 injection Substances 0.000 title claims description 26
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 8
- 229910000679 solder Inorganic materials 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
Definitions
- the invention relates to a nozzle assembly and an injection valve, which comprises the nozzle body and is suitable for metering fuel into a combustion chamber of a cylinder of an internal combustion engine.
- An injection valve comprises a nozzle assembly having a nozzle body with a recess into which a nozzle needle is introduced.
- the nozzle needle is axially movable in the recess and closes in a closed position an injection nozzle and releases it in other positions and thus allows a metering of fuel.
- an actuator is further provided, which acts on the nozzle needle.
- a fuel injector is known with a front housing and a rear housing. Further, the fuel injector includes a nozzle needle which is guided in its axial movement by nozzle needle guides which are attached to the front housing. To fuel to be able to flow through the nozzle needle guides, the nozzle needle guides have recesses.
- an injector is known with a nozzle needle and a spring. A force transmission from the spring to the nozzle needle via a formed on the nozzle needle annular shoulder.
- a fuel injection valve which has an actuator piston with a shoulder ring on which a spring element is supported.
- An injection valve is known with a nozzle body having a recess in which a nozzle needle is received.
- a guide region is formed for guiding the nozzle needle.
- grooves are formed through which fluid can flow.
- an injection valve is known with a housing and a nozzle needle. In the region of a guide of the nozzle needle this is provided with axially extending flats.
- the object of the invention is to provide a nozzle assembly and an injection valve, which is or is simple and can be precisely controlled.
- the invention is characterized by a nozzle assembly having a nozzle body with a recess into which a nozzle needle is inserted and at one axial end of an injection nozzle is formed, which has axially adjacent to the injection nozzle a first guide region for the nozzle needle, the at least one cross-sectional widening has, which extends to the other axial end.
- the recess is designed to supply fluid to the injection nozzle.
- a guide bush is introduced, which forms a second guide region for the nozzle needle and which is designed to pass fuel radially outside the second guide region.
- the invention is further characterized by an injection valve with an injector housing, in which an actuator is arranged, and with the nozzle assembly.
- the guide bushing makes it possible to dispense with a reduction in the cross-sectional area of the nozzle needle in the second guide region. This can easily be ensured a very high rigidity of the nozzle needle.
- a high rigidity of the nozzle needle allows a precise movement of the nozzle needle even with a small available stroke of the actuator. Due to the at least one cross-sectional widening of the recess, the volume available for the fluid to be metered is increased in the recess upstream of the guide bushing. In this way, pressure pulsations of the fluid can be damped in the region of the recess, which arise after the release of the injection nozzle or after the closing of the injection nozzle. On the one hand, this leads to a more precise metering of fluid and, on the other hand, also increases the service life of the nozzle body.
- the nozzle assembly has a coupling element which is fixed on the nozzle needle. An axial end of a bellows is coupled to the coupling element. Further, a sleeve-shaped spring holder is coupled to the coupling element, on which an axial end of a return spring for the nozzle needle is supported. The return spring is formed overlapping the bellows.
- the nozzle needle can thus be made of a good curable material without regard to suitable material properties for other methods of connection with the coupling element, such as welding.
- both the return spring and the bellows with the nozzle needle can be coupled by means of the coupling element.
- the pen holder is sleeve-shaped.
- the bellows and the return spring are arranged axially overlapping.
- a smaller axial length of the nozzle needle is necessary, which has a higher rigidity of the nozzle needle result.
- a better power transmission from the actuator via the nozzle needle is possible because forces acting radially in the nozzle spring can be compensated by the sleeve-shaped spring holder and thus are transmitted to the nozzle needle only to a limited extent.
- the guide bush is fixed by means of a press fit in the recess of the nozzle body.
- the bellows is coupled at its other axial end with a sleeve which is applied to the nozzle needle and is radially outwardly sealingly coupled to a cover plate having a recess which penetrates the nozzle needle.
- a sleeve which is applied to the nozzle needle and is radially outwardly sealingly coupled to a cover plate having a recess which penetrates the nozzle needle.
- the cover plate is coupled by means of a laser solder connection to the nozzle body.
- a laser solder connection to the nozzle body.
- An injector often referred to as an injector has an injector 1, in which an actuator designed as a piezo actuator 2 is arranged. Furthermore, a compensation element 4, which is preferably a hydraulic compensating element, is preferably arranged in the injector housing 1 and compensates for different thermal expansion coefficients of the piezoactuator 2 and of the injector housing 1.
- the injection valve further comprises a nozzle body 6 with a recess 8, in which a nozzle needle 10 is introduced. At an axial end of the recess 8, an injection nozzle 12 is formed.
- the nozzle needle 10 is axially movable in the recess 8. In its closed position, the in FIG. 1 A suitable axial extent of the piezoactuator 2 leads to a movement of the nozzle needle 10 out of its closed position and thus to a release of the fuel flow through the injection nozzle 12th
- a first guide region 14 is formed on the wall of the recess 8 in axial proximity to the injection nozzle 12. Subsequent to the first guide region 14, the recess 8 has a first extension 16 of its cross section at a corresponding axial distance then a second extension 18 of its cross section. It can also have additional extensions of its cross section.
- the recess 8 can thus be made by simply drilling with drills of different diameters.
- a guide bush 20 is inserted into the recess 8.
- the guide bush 20 has a second guide region 22 for the nozzle needle 10. It is preferably pressed with the nozzle body 6. Furthermore, it is designed to pass fuel, which can be supplied via a high-pressure bore 26 to the recess 8.
- the guide bush 20 preferably on its radial circumference on portions which are set back radially in comparison to the radius of the recess 8 in the region of the second extension 18 of the cross section. This can be easily achieved by one or more flat surfaces. This then has the consequence that in a partial region of the circumference of the guide bush 20 between it and the nozzle body, a gap 24 is formed.
- the fuel in the region of the guide bush 20 can also be passed through the recess 8 through another suitable design of the guide bush 20.
- one or more axial bores can be formed radially outside the second guide region 22 in the guide bushing.
- both the nozzle body 6 and the guide bush 20 are formed of a good hardenable material, preferably a steel with a high carbon content. In this way, a favorable for the guide portions 14, 22 high hardness can be easily realized.
- a return spring 28 is further arranged, which is supported at its one free axial end on a shoulder 30 of the nozzle body 1.
- 28 may be inserted between the shoulder 30 and the one free axial end of the return spring also a shim.
- the restoring spring 28 is supported on a spring holder 32, namely on a collar 34 of the spring holder 32.
- the spring holder 32 is mechanically coupled by means of a coupling element 36 with the nozzle needle 10 and biases them into their closed position.
- the spring holder 32 has a sleeve-shaped region which extends in the axial direction coaxially with the nozzle needle 10.
- the spring holder 32 is coupled by means of a positive connection with the coupling element 36.
- it may also be coupled to the coupling elements 36, for example, by welding or soldering.
- the coupling element 36 is coupled by means of a press fit with the nozzle needle 10.
- the nozzle needle is preferably coated with a lubricant which comprises Teflon for applying the coupling element 36 and then the coupling element 36 is pressed onto the nozzle needle 10 by appropriate application with a corresponding force.
- the interference fit between the coupling element 36 and the nozzle needle 10 has the advantage that an otherwise necessary welding for mechanical coupling of the coupling element 36 with the nozzle needle 10 can be omitted and thus the nozzle needle can be made of a very good curable material, which is generally unsuitable is for welding.
- a bellows 38 is further coupled to the coupling element 36 at its one free axial end.
- the bellows 38 is preferably made of metal.
- the bellows 38 is preferably welded to the coupling element 36.
- At its other axial end of the bellows 38 is coupled to a sleeve 40, and also preferably by means of a welded connection.
- the sleeve 40 is also sealingly connected to a cover plate 42 at its outer periphery.
- the cover plate 42 is sealingly connected to the nozzle body 6 in a region 44. In this way, it can be easily ensured that the fuel located in the recess 8 does not reach the piezoactuator 2.
- the cover plate 42 is preferably connected in the region 44 with the nozzle body 6 by means of a laser solder connection.
- the solder used is preferably a silver-containing solder.
- Silver-containing solder is characterized by a relatively low melting temperature and thus the required thermal energy during the soldering process is relatively low.
- soldering by means of a laser is characterized by the fact that the thermal energy can be locally supplied very precisely and thus can be locally supplied accordingly limited, which means that the adjacent components heat only insignificantly during soldering. This is particularly advantageous in connection with the return spring 28, since its spring stiffness can change permanently with correspondingly high heating of the return spring 28.
- the nozzle body 6, the nozzle needle 10, the guide bush 20, the return spring 28, the spring holder 32, the coupling element 36, the bellows 38, the sleeve 40 and the cover plate 42 form a nozzle assembly.
- the nozzle assembly is coupled to the injector housing 1 by means of a nozzle lock nut 46.
- a nozzle lock nut 46 By the formation of the nozzle lock nut 46, the nozzle body 6, the cover plate 42 and the injector housing 1, as shown in the FIG. 1 is shown, it is ensured that in the area 44 no strong tensile forces must be transmitted.
- the preferred solder joint between the cover plate 42 and the nozzle body 6 must therefore be able to fulfill substantially only a sealing function.
- the nozzle body 6 may also be welded to the cover plate 42.
- the design of the coupling element 36, the spring holder 32 can also be independent of the guide bush 20.
Description
Die Erfindung betrifft eine Düsenbaugruppe und ein Einspritzventil, das den Düsenkörper umfasst und geeignet ist zum Zumessen von Kraftstoff in einen Brennraum eines Zylinders einer Brennkraftmaschine.The invention relates to a nozzle assembly and an injection valve, which comprises the nozzle body and is suitable for metering fuel into a combustion chamber of a cylinder of an internal combustion engine.
Immer strengere gesetzliche Vorschriften bezüglich der zulässigen Schadstoff-Emissionen von Brennkraftmaschinen, die in Kraftfahrzeugen angeordnet sind, machen es erforderlich diverse Maßnahmen vorzunehmen, durch die die Schadstoff-Emissionen gesenkt werden. Ein Ansatzpunkt hierbei ist, die von der Brennkraftmaschine durch den Verbrennungsprozess des Luft/Kraftstoff-Gemisches erzeugten Schadstoff-Emissionen direkt zu senken. Voraussetzung dafür ist, dass der Kraftstoff sehr präzise zugemessen wird. Dies ist mittels eines Einspritzventils möglich, das sehr präzise ansteuerbar ist. Ein Einspritzventil umfasst eine Düsenbaugruppe mit einem Düsenkörper mit einer Ausnehmung, in die eine Düsennadel eingebracht ist. Die Düsennadel ist axial in der Ausnehmung bewegbar und verschließt in einer Schließposition eine Einspritzdüse und gibt diese in anderen Positionen frei und ermöglicht somit dann ein Zumessen von Kraftstoff. Bei bekannten Einspritzventilen ist ferner ein Stellantrieb vorgesehen, der auf die Düsennadel einwirkt.Increasingly stringent legal regulations regarding permissible pollutant emissions of internal combustion engines, which are arranged in motor vehicles, make it necessary to carry out various measures by which the pollutant emissions are reduced. A starting point here is to directly reduce the pollutant emissions generated by the internal combustion engine through the combustion process of the air / fuel mixture. The prerequisite for this is that the fuel is metered very precisely. This is possible by means of an injection valve which can be controlled very precisely. An injection valve comprises a nozzle assembly having a nozzle body with a recess into which a nozzle needle is introduced. The nozzle needle is axially movable in the recess and closes in a closed position an injection nozzle and releases it in other positions and thus allows a metering of fuel. In known injection valves, an actuator is further provided, which acts on the nozzle needle.
Aus der
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Die Aufgabe der Erfindung ist es, eine Düsenbaugruppe und ein Einspritzventil zu schaffen, die beziehungsweise das einfach ist und präzise angesteuert werden kann.The object of the invention is to provide a nozzle assembly and an injection valve, which is or is simple and can be precisely controlled.
Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Patentansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.
Die Erfindung zeichnet sich aus durch eine Düsenbaugruppe mit einem Düsenkörper mit einer Ausnehmung, in die eine Düsennadel eingebracht ist und an deren einem axialen Ende eine Einspritzdüse ausgebildet ist, die axial benachbart zu der Einspritzdüse einen ersten Führungsbereich für die Düsennadel hat, die mindestens eine Querschnittserweiterung hat, die sich hin zu dem anderen axialen Ende erstreckt. Die Ausnehmung ist ausgebildet zum Zuführen von Fluid zu der Einspritzdüse. In einem Teilbereich der Querschnittserweiterung der Ausnehmung ist eine Führungsbuchse eingebracht, die einen zweiten Führungsbereich für die Düsennadel bildet und die ausgebildet ist zum Durchleiten von Kraftstoff radial außerhalb des zweiten Führungsbereichs. Die Erfindung zeichnet sich ferner aus durch ein Einspritzventil mit einem Injektorgehäuse, in dem ein Stellantrieb angeordnet ist, und mit der Düsenbaugruppe.The invention is characterized by a nozzle assembly having a nozzle body with a recess into which a nozzle needle is inserted and at one axial end of an injection nozzle is formed, which has axially adjacent to the injection nozzle a first guide region for the nozzle needle, the at least one cross-sectional widening has, which extends to the other axial end. The recess is designed to supply fluid to the injection nozzle. In a partial region of the cross-sectional widening of the recess, a guide bush is introduced, which forms a second guide region for the nozzle needle and which is designed to pass fuel radially outside the second guide region. The invention is further characterized by an injection valve with an injector housing, in which an actuator is arranged, and with the nozzle assembly.
Die Führungsbuchse ermöglicht, dass in dem zweiten Führungsbereich auf ein Verringern der Querschnittsfläche der Düsennadel verzichtet werden kann. Dadurch kann einfach eine sehr hohe Steifigkeit der Düsennadel gewährleistet werden. Eine hohe Steifigkeit der Düsennadel ermöglicht auch bei einem geringen zur Verfügung stehenden Hub des Stellantriebs ein präzises Bewegen der Düsennadel. Durch die mindestens eine Querschnittserweiterung der Ausnehmung wird das für das zuzumessende Fluid zur Verfügung stehende Volumen in der Ausnehmung stromaufwärts der Führungsbuchse erhöht. Auf diese Weise können Druckpulsationen des Fluids in dem Bereich der Ausnehmung gedämpft werden, die nach dem Freigeben der Einspritzdüse oder nach dem Schließen der Einspritzdüse entstehen. Dies führt zum einen zu einem präziseren Zumessen von Fluid und erhöht zum anderen auch die Lebensdauer des Düsenkörpers.The guide bushing makes it possible to dispense with a reduction in the cross-sectional area of the nozzle needle in the second guide region. This can easily be ensured a very high rigidity of the nozzle needle. A high rigidity of the nozzle needle allows a precise movement of the nozzle needle even with a small available stroke of the actuator. Due to the at least one cross-sectional widening of the recess, the volume available for the fluid to be metered is increased in the recess upstream of the guide bushing. In this way, pressure pulsations of the fluid can be damped in the region of the recess, which arise after the release of the injection nozzle or after the closing of the injection nozzle. On the one hand, this leads to a more precise metering of fluid and, on the other hand, also increases the service life of the nozzle body.
Die Düsenbaugruppe hat ein Koppelelement, das auf der Düsenadel fixiert ist. Mit dem Koppelelement ist ein axiales Ende eines Faltenbalgs gekoppelt. Ferner ist mit dem Koppelelement ein hülsenförmig ausgebildeter Federhalter gekoppelt, auf den sich ein axiales Ende einer Rückstellfeder für die Düsennadel abstützt. Die Rückstellfeder ist überdeckend zu dem Faltenbalg ausgebildet. Die Düsennadel kann so aus einem gut härtbaren Material hergestellt sein ohne Rücksichtnahme auf geeignete Materialeigenschaften für andere Verbindungsverfahren mit dem Koppelelement, wie beispielsweise Schweißen. Darüber hinaus sind mittels des Koppelelements sowohl die Rückstellfeder als auch der Faltenbalg mit der Düsennadel koppelbar.The nozzle assembly has a coupling element which is fixed on the nozzle needle. An axial end of a bellows is coupled to the coupling element. Further, a sleeve-shaped spring holder is coupled to the coupling element, on which an axial end of a return spring for the nozzle needle is supported. The return spring is formed overlapping the bellows. The nozzle needle can thus be made of a good curable material without regard to suitable material properties for other methods of connection with the coupling element, such as welding. In addition, both the return spring and the bellows with the nozzle needle can be coupled by means of the coupling element.
Der Federhalter ist hülsenförmig ausgebildet. Der Faltenbalg und die Rückstellfeder sind axial überdeckend angeordnet. So ist eine geringere axiale Länge der Düsennadel notwendig, was eine höhere Steifigkeit der Düsennadel zur Folge hat. Darüber hinaus ist auch eine bessere Kraftübertragung von dem Stellantrieb über die Düsennadel möglich, da radial in der Düsenfeder wirkende Kräfte durch den hülsenförmigen Federhalter ausgeglichen werden können und somit nur in geringem Umfang auf die Düsennadel übertragen werden. The pen holder is sleeve-shaped. The bellows and the return spring are arranged axially overlapping. Thus, a smaller axial length of the nozzle needle is necessary, which has a higher rigidity of the nozzle needle result. In addition, a better power transmission from the actuator via the nozzle needle is possible because forces acting radially in the nozzle spring can be compensated by the sleeve-shaped spring holder and thus are transmitted to the nozzle needle only to a limited extent.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist die Führungsbuchse mittels eines Pressverbandes in der Ausnehmung des Düsenkörpers fixiert. Dies hat den Vorteil, dass sowohl die Führungsbuchse als auch der Düsenkörper aus einem gut härtbaren Material gefertigt sein können ohne Rücksichtnahme auf geeignete Materialeigenschaften für andere Verbindungstechniken, wie beispielsweise Schweißen.According to an advantageous embodiment of the invention, the guide bush is fixed by means of a press fit in the recess of the nozzle body. This has the advantage that both the guide bush and the nozzle body can be made of a good hardenable material without regard to suitable material properties for other joining techniques, such as welding.
Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung ist der Faltenbalg an seinem anderen axialen Ende mit einer Hülse gekoppelt, die auf die Düsennadel aufgebracht ist und radial außen dichtend mit einer Abdeckplatte gekoppelt ist, die eine Ausnehmung hat, die die Düsennadel durchdringt. Auf diese Weise kann der Bereich, der sich an die Abdeckplatte auf deren Seite anschließt, die der Führungsbuchse abgewandt ist zuverlässig gegen das in der Ausnehmung des Düsenkörpers befindliche Fluid abgedichtet werden.According to a further advantageous embodiment of the invention, the bellows is coupled at its other axial end with a sleeve which is applied to the nozzle needle and is radially outwardly sealingly coupled to a cover plate having a recess which penetrates the nozzle needle. In this way, the area which adjoins the cover plate on its side facing away from the guide bushing can be reliably sealed against the fluid located in the recess of the nozzle body.
Es ist ferner vorteilhaft, wenn die Abdeckplatte mittels einer Laser-Lotverbindung an den Düsenkörper gekoppelt ist. Auf diese Weise ist beim Herstellen der Verbindung zwischen der Abdeckplatte und dem Düsenkörper nur eine sehr lokal begrenzte und im Vergleich zum Schweißen sehr geringe Erwärmung notwendig. Dadurch kann einfach sichergestellt werden, dass sich beispielsweise die Steifigkeit der Rückstellfeder während dieses Verbindungsvorganges nicht verändert.It is also advantageous if the cover plate is coupled by means of a laser solder connection to the nozzle body. In this way, when making the connection between the cover plate and the nozzle body only a very localized and compared to welding very low heating is necessary. This can easily be ensured that, for example, the rigidity of the return spring does not change during this connection process.
Ausführungsbeispiele der Erfindung sind im folgenden anhand der schematischen Zeichnungen näher beispielhaft erläutert. Es zeigen:
- Figur 1
- einen Schnitt durch ein Einspritzventil mit einem Düsenkörper und
Figur 2- einen weiteren Schnitt durch den Düsenkörper gemäß
Figur 1 .
- FIG. 1
- a section through an injection valve with a nozzle body and
- FIG. 2
- a further section through the nozzle body according to
FIG. 1 ,
Elemente gleicher Konstruktion oder Funktion sind mit den gleichen Bezugszeichen gekennzeichnet.Elements of the same construction or function are identified by the same reference numerals.
Ein Einspritzventil, das häufig auch als Injektor bezeichnet wird (
Das Einspritzventil umfasst ferner eine Düsenkörper 6 mit einer Ausnehmung 8, in die eine Düsennadel 10 eingebracht ist. An einem axialen Ende der Ausnehmung 8 ist eine Einspritzdüse 12 ausgebildet. Die Düsennadel 10 ist axial in der Ausnehmung 8 bewegbar. In ihrer Schließposition, die in
Ein erster Führungsbereich 14 ist an der Wandung der Ausnehmung 8 in axialer Nähe zu der Einspritzdüse 12 ausgebildet. Im Anschluss an den ersten Führungsbereich 14 hat die Ausnehmung 8 eine erste Erweiterung 16 ihres Querschnitts in einem entsprechenden axialen Abstand dann noch eine zweite Erweiterung 18 ihres Querschnitts. Sie kann auch zusätzliche Erweiterungen ihres Querschnitts aufweisen. Die Ausnehmung 8 kann somit durch einfaches Bohren mit Bohrern unterschiedlichen Durchmessers hergestellt werden.A
In dem Bereich der zweiten Erweiterung 18 des Querschnitts ist eine Führungsbuchse 20 in die Ausnehmung 8 eingebracht. Die Führungsbuchse 20 hat einen zweiten Führungsbereich 22 für die Düsennadel 10. Sie ist bevorzugt verpresst mit dem Düsenkörper 6. Ferner ist sie ausgebildet zum Durchleiten von Kraftstoff, der über eine Hochdruckbohrung 26 hin zu der Ausnehmung 8 zuleitbar ist. Dazu weist die Führungsbuchse 20 bevorzugt an ihrem radialen Umfang Teilbereiche auf, die radial im Vergleich zu dem Radius der Ausnehmung 8 im Bereich der zweiten Erweiterung 18 des Querschnitts zurückversetzt sind. Dies kann einfach durch eine oder mehrere plane Flächen erreicht werden. Dies hat dann zur Folge, dass sich in einem Teilbereich des Umfangs der Führungsbuchse 20 zwischen ihr und dem Düsenkörper ein Spalt 24 ausbildet. In einem oder mehreren anderen Teilbereichen des Umfangs der Führungsbuchse 20 liegt diese dann mittels des Presssitzes an dem Düsenkörper an. Dies ist anhand des Schnittes der
Das Durchleiten des Kraftstoffs durch die Ausnehmung 8 in dem Bereich, in dem die Führungsbuchse 20 angeordnet ist, erfolgt somit durch entsprechende Ausgestaltung der Führungsbuchse und erfordert nicht, dass zum Durchleiten des Kraftstoffes die Querschnittsfläche der Düsennadel 10 in diesem Bereich verringert wird. Dies hat den Vorteil, dass die Steifigkeit der Düsennadel höher ist, als wenn auf eine derartige Verringerung der Querschnittsfläche nicht verzichtet werden kann. Bevorzugt sind sowohl der Düsenkörper 6 als auch die Führungsbuchse 20 aus einem gut härtbaren Material, vorzugsweise einem Stahl mit einem hohen Kohlenstoffgehalt ausgebildet. Auf diese Weise kann eine für die Führungsbereiche 14, 22 günstige hohe Härte einfach realisiert werden.The passage of the fuel through the
In dem Düsenkörper 6 ist ferner eine Rückstellfeder 28 angeordnet, die sich an ihrem einem freien axialen Ende an einem Absatz 30 des Düsenkörpers 1 abstützt. Gegebenenfalls kann zwischen dem Absatz 30 und dem einen freien axialen Ende der Rückstellfeder 28 auch noch eine Einstellscheibe eingelegt sein.In the nozzle body 6, a
An ihrem anderen axialen Ende stützt sich die Rückstellfeder 28 an einem Federhalter 32 und zwar an einem Kragen 34 des Federhalters 32 ab. Der Federhalter 32 ist mittels eines Koppelelementes 36 mit der Düsennadel 10 mechanisch gekoppelt und spannt diese in ihre Schließposition vor. Bevorzugt, jedoch nicht notwendigerweise, weist der Federhalter 32 einen hülsenförmigen Bereich auf, der sich in axialer Richtung koaxial zu der Düsennadel 10 erstreckt. Besonders einfach ist der Federhalter 32 mittels eines Formschlusses mit dem Koppelelement 36 gekoppelt. Er kann jedoch auch beispielsweise durch Schweißen oder Löten mit dem Koppelelemente 36 gekoppelt sein.At its other axial end, the restoring
Das Koppelelement 36 ist mittels eines Presssitzes mit der Düsennadel 10 gekoppelt. Bevorzugt wird beim Herstellen des Einspritzventils die Düsennadel zum Aufbringen des Koppelelements 36 mit einem Gleitmittel, das Teflon umfasst beschichtet und dann das Koppelelement 36 durch entsprechendes Aufbringen mit einer entsprechenden Kraft auf die Düsennadel 10 aufgepresst. Der Presssitz zwischen dem Koppelelement 36 und der Düsennadel 10 hat den Vorteil, dass ein sonst notwendiges Schweißen zum mechanischen Koppeln des Koppelelements 36 mit der Düsennadel 10 entfallen kann und somit die Düsennadel aus einem sehr gut härtbaren Material gefertigt sein kann, das in der Regel ungeeignet ist zum Schweißen.The
Ein Faltenbalg 38 ist ferner mit dem Koppelelement 36 an seinem einen freien axialen Ende gekoppelt. Der Faltenbalg 38 ist bevorzugt aus Metall hergestellt. Der Faltenbalg 38 ist bevorzugt mit dem Koppelelement 36 verschweißt. An seinem anderen axialen Ende ist der Faltenbalg 38 mit einer Hülse 40 gekoppelt und zwar ebenfalls bevorzugt mittels einer Schweißverbindung.A bellows 38 is further coupled to the
Die Hülse 40 ist ferner an ihrem äußeren Umfang dichtend mit einer Abdeckplatte 42 verbunden. Die Abdeckplatte 42 ist in einem Bereich 44 dichtend mit dem Düsenkörper 6 verbunden. Auf diese Weise kann einfach sichergestellt werden, dass der in der Ausnehmung 8 befindliche Kraftstoff nicht hin zu dem Piezoaktuator 2 gelangt.The
Die Abdeckplatte 42 ist bevorzugt in dem Bereich 44 mit dem Düsenkörper 6 mittels einer Laser-Lotverbindung verbunden. Als Lot wird bevorzugt ein silberhaltiges Lot eingesetzt. Silberhaltiges Lot zeichnet sich durch eine relativ niedrige Schmelztemperatur aus und somit ist die benötigte thermische Energie während des Lötvorgangs relativ gering. Darüber hinaus zeichnet sich Löten mittels eines Lasers dadurch aus, dass die thermische Energie örtlich sehr präzise zugeführt werden kann und somit auch entsprechend lokal begrenzt zugeführt werden kann, was dazu führt, dass sich die benachbarten Bauteile während des Lötens nur unwesentlich erhitzen. Dies ist insbesondere im Zusammenhang mit der Rückstellfeder 28 von Vorteil, da sich ihre Federsteifigkeit bei entsprechend hoher Aufheizung der Rückstellfeder 28 dauerhaft verändern kann.The
Der Düsenkörper 6, die Düsennadel 10, die Führungsbuchse 20, die Rückstellfeder 28, der Federhalter 32, das Koppelelement 36, der Faltenbalg 38, die Hülse 40 und die Abdeckplatte 42 bilden eine Düsenbaugruppe.The nozzle body 6, the
Die Düsenbaugruppe ist mit dem Injektorgehäuse 1 mittels einer Düsenspannmutter 46 gekoppelt. Durch die Ausbildung der Düsenspannmutter 46, des Düsenkörpers 6, der Abdeckplatte 42 und des Injektorgehäuses 1, wie sie in der
In einer alternativen Ausführungsform kann der Düsenkörper 6 jedoch auch mit der Abdeckplatte 42 verschweißt sein. Die Ausgestaltung des Koppelelements 36, des Federhalters 32 kann auch unabhängig von der Führungsbuchse 20 erfolgen.In an alternative embodiment, however, the nozzle body 6 may also be welded to the
Claims (6)
- Nozzle assembly having a nozzle body (6) with a recess (8) into which a nozzle needle (10) is introduced and at one axial end of which an injection nozzle (12) is embodied which, axially adjacent to the injection nozzle (12), has a first guide region (14) for the nozzle needle (10) which has at least one cross-sectional extension which extends toward the other axial end of the recess (8), the recess (8) being embodied for supplying fluid to the injection nozzle (12), and in a subsection of the cross-sectional extension a guide bushing (20) is introduced into the recess (8), which guide bushing (20) forms a second guide region (22) for the nozzle needle (10) and which is embodied for conducting fluid radially outside of the second guide region (22), with a coupling element (36) being provided, which is secured on the nozzle needle (10), to which an axial end of a bellows (38) is coupled and to which a sleeve-shaped spring holder (32) is coupled, on which an axial end of a resetting spring (28) is supported, which is designed to axially cover the bellows.
- Nozzle assembly according to claim 1,
wherein the guide bushing (20) is secured in the recess (8) by means of an interference fit assembly. - Nozzle assembly according to one of the preceding claims,
wherein the coupling element (36) is secured on the nozzle needle (10) by means of an interference fit assembly. - Nozzle assembly according to one of the preceding claims,
wherein the bellows (38) is linked at its other axial end to a sleeve (40) which is mounted onto the nozzle needle (10) and is coupled radially externally in a sealing manner to a cover plate (42) which has a recess (8) which is penetrated by the nozzle needle (10). - Nozzle assembly according to claim 4,
wherein the cover plate (42) is coupled to the nozzle body (6) by means of a laser solder joint. - Injection valve having a nozzle assembly according to one of the preceding claims, an injector housing (1) and an actuator which acts on the nozzle needle (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004024119A DE102004024119B4 (en) | 2004-05-14 | 2004-05-14 | Nozzle assembly and injector |
| PCT/EP2005/051985 WO2005111407A1 (en) | 2004-05-14 | 2005-05-02 | Nozzle assembly and injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1745210A1 EP1745210A1 (en) | 2007-01-24 |
| EP1745210B1 true EP1745210B1 (en) | 2008-09-10 |
Family
ID=34968376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05743039A Expired - Fee Related EP1745210B1 (en) | 2004-05-14 | 2005-05-02 | Nozzle assembly and injection valve |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7934669B2 (en) |
| EP (1) | EP1745210B1 (en) |
| JP (1) | JP4473915B2 (en) |
| DE (2) | DE102004024119B4 (en) |
| WO (1) | WO2005111407A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007024221B4 (en) * | 2007-05-15 | 2011-06-16 | Lechler Gmbh | Method for producing a high pressure spray nozzle and high pressure spray nozzle |
| DE102010042476A1 (en) * | 2010-10-14 | 2012-04-19 | Robert Bosch Gmbh | Device for injecting fuel |
| DE102011087005A1 (en) * | 2011-11-24 | 2013-05-29 | Robert Bosch Gmbh | Valve for metering a flowing medium |
| WO2013122317A1 (en) | 2012-02-13 | 2013-08-22 | 현대중공업 주식회사 | Check valve driving device for injecting gas |
| US9416709B2 (en) * | 2012-06-15 | 2016-08-16 | Continental Automotive Systems, Inc. | Coking resistant after-treatment dosing value |
| US20140054396A1 (en) * | 2012-08-21 | 2014-02-27 | International Engine Intellectual Property Company, Llc | Fluid injector |
| DE102019103329A1 (en) * | 2019-02-11 | 2020-08-13 | Liebherr-Components Deggendorf Gmbh | Nozzle of a fuel injector and fuel injector with such a nozzle |
| DE102022206220A1 (en) | 2022-06-22 | 2023-12-28 | Robert Bosch Gesellschaft mit beschränkter Haftung | Fuel valve for metered delivery of fuel |
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| US2391808A (en) * | 1942-08-19 | 1945-12-25 | Continental Motors Corp | Fuel atomizer |
| US2559364A (en) * | 1944-06-24 | 1951-07-03 | William H Mashinter | Fuel injector |
| US2753217A (en) * | 1952-11-08 | 1956-07-03 | Texas Co | Fuel injection nozzle for internal combustion engine |
| US4790055A (en) * | 1987-06-15 | 1988-12-13 | Stanadyne, Inc. | Method of assembling a fuel nozzle assembly |
| US4938193A (en) * | 1987-06-15 | 1990-07-03 | Stanadyne Automotive Corp. | Fuel injection nozzle |
| US4785156A (en) * | 1987-12-18 | 1988-11-15 | American Telephone And Telegraph Company | Soldering method using localized heat source |
| JP3560174B2 (en) * | 1994-05-17 | 2004-09-02 | 株式会社デンソー | Fluid injection nozzle and fuel injection valve using the same |
| DE4440182C2 (en) * | 1994-11-10 | 2003-09-18 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
| DE19633260A1 (en) * | 1996-08-17 | 1998-02-19 | Bosch Gmbh Robert | Injection valve, in particular for injecting fuel directly into a combustion chamber of an internal combustion engine |
| DE19736682A1 (en) * | 1997-08-22 | 1999-02-25 | Bosch Gmbh Robert | Fuel injector for internal combustion engine |
| JP3704957B2 (en) * | 1998-07-06 | 2005-10-12 | いすゞ自動車株式会社 | Injector |
| GB9819746D0 (en) * | 1998-09-11 | 1998-11-04 | Lucas Ind Plc | Fuel injector |
| DE19912665A1 (en) | 1999-03-20 | 2000-09-21 | Bosch Gmbh Robert | Fuel injector |
| DE19946766C2 (en) | 1999-09-29 | 2001-07-26 | Siemens Ag | Injector for an internal combustion engine with direct injection |
| US6959878B1 (en) * | 1999-11-17 | 2005-11-01 | Stanadyne Corporation | Compact fuel injection nozzle |
| US6439484B2 (en) * | 2000-02-25 | 2002-08-27 | Denso Corporation | Fluid injection nozzle |
| DE10039424A1 (en) * | 2000-08-11 | 2002-02-28 | Siemens Ag | Dosing valve with a hydraulic transmission element |
| FR2815085B1 (en) * | 2000-10-05 | 2005-07-08 | Denso Corp | IMPROVED FUEL INJECTOR STRUCTURE TO PREVENT INJECTION OF EXCESSIVE FUEL QUANTITY |
| WO2002031851A1 (en) | 2000-10-06 | 2002-04-18 | General Electric Company | Lamp mount with a lamp mounting tube |
| WO2002031344A1 (en) | 2000-10-11 | 2002-04-18 | Siemens Vdo Automotive Corporation | Dual-spring compensator assembly for a fuel injector and method |
| DE10054182A1 (en) * | 2000-11-02 | 2002-05-29 | Siemens Ag | Fluid dosing device with a throttle point includes a metal bellows sealing a region around the leadthrough element of a needle valve passing through a chamber |
| KR100588766B1 (en) * | 2000-11-02 | 2006-06-14 | 지멘스 악티엔게젤샤프트 | Fluid dosing device with a throttle point |
| DE60104906T2 (en) * | 2000-11-13 | 2005-01-05 | Siemens Vdo Automotive Corporation, Auburn Hills | MAGNETOHYDRAULIC BALANCING DEVICE FOR FUEL INJECTION NOZZLE |
| US6499471B2 (en) * | 2001-06-01 | 2002-12-31 | Siemens Automotive Corporation | Hydraulic compensator for a piezoelectrical fuel injector |
| DE10159749A1 (en) * | 2001-12-05 | 2003-06-12 | Bosch Gmbh Robert | Fuel injection valve for an internal combustion engine comprises a pressure space which contains a hydraulic fluid and, by means of sealing units, is separated from the actuator and fuel spaces |
| DE10204655A1 (en) * | 2002-02-05 | 2003-08-28 | Bosch Gmbh Robert | Fuel injector |
| US6749127B2 (en) * | 2002-02-11 | 2004-06-15 | Siemens Vdo Automotive Corporation | Method of filling fluid in a thermal compensator |
| DE10217594A1 (en) | 2002-04-19 | 2003-11-06 | Bosch Gmbh Robert | Fuel injection valve for IC engines has throttle gap formed by Laser/erosion drilling, and positioned separate from guide gaps, for cheaper fabrication of gaps |
| EP1497553B1 (en) * | 2002-04-22 | 2010-01-13 | Continental Automotive GmbH | Dosing device for fluids, especially a motor vehicle injection valve |
| DE10226649A1 (en) * | 2002-06-14 | 2004-01-08 | Siemens Ag | Dosing device for fluids, in particular motor vehicle injection valve |
| DE10232193A1 (en) | 2002-07-16 | 2004-02-05 | Robert Bosch Gmbh | Fuel injector |
| JP4167230B2 (en) * | 2004-01-13 | 2008-10-15 | デルファイ・テクノロジーズ・インコーポレイテッド | Fuel injection device |
| DE602005005242T2 (en) * | 2004-04-26 | 2009-04-02 | Isuzu Motors Ltd. | Length compensation element and this containing fuel injection valve |
-
2004
- 2004-05-14 DE DE102004024119A patent/DE102004024119B4/en not_active Expired - Fee Related
-
2005
- 2005-05-02 WO PCT/EP2005/051985 patent/WO2005111407A1/en active IP Right Grant
- 2005-05-02 EP EP05743039A patent/EP1745210B1/en not_active Expired - Fee Related
- 2005-05-02 US US11/569,106 patent/US7934669B2/en not_active Expired - Fee Related
- 2005-05-02 JP JP2007512179A patent/JP4473915B2/en not_active Expired - Fee Related
- 2005-05-02 DE DE502005005334T patent/DE502005005334D1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004024119A1 (en) | 2005-12-08 |
| US20070210189A1 (en) | 2007-09-13 |
| DE102004024119B4 (en) | 2006-04-20 |
| DE502005005334D1 (en) | 2008-10-23 |
| US7934669B2 (en) | 2011-05-03 |
| EP1745210A1 (en) | 2007-01-24 |
| JP2007537391A (en) | 2007-12-20 |
| JP4473915B2 (en) | 2010-06-02 |
| WO2005111407A1 (en) | 2005-11-24 |
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