EP1745210A1 - Düsenbaugruppe und einspritzventil - Google Patents
Düsenbaugruppe und einspritzventilInfo
- Publication number
- EP1745210A1 EP1745210A1 EP05743039A EP05743039A EP1745210A1 EP 1745210 A1 EP1745210 A1 EP 1745210A1 EP 05743039 A EP05743039 A EP 05743039A EP 05743039 A EP05743039 A EP 05743039A EP 1745210 A1 EP1745210 A1 EP 1745210A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- recess
- nozzle needle
- axial end
- guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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 with a nozzle body with a recess into which a nozzle needle is inserted.
- the nozzle needle is axially movable in the recess and closes an injection nozzle in a closed position and releases it in other positions and thus enables fuel to be metered.
- an actuator is also provided, which acts on the nozzle needle.
- the object of the invention is to provide a nozzle assembly and an injection valve which is simple and which can be controlled precisely.
- the object is achieved by the features of the independent claims.
- Advantageous embodiments of the invention are characterized in the subclaims.
- the invention is characterized by a nozzle assembly with a nozzle body with a recess into which a nozzle needle is inserted and at the one axial end of which an injection nozzle is formed which has a first guide region for the nozzle needle axially adjacent to the injection nozzle and which has at least one cross-sectional extension has, which extends to the other axial end.
- the recess is designed to supply fluid to the injection nozzle.
- a guide bushing which forms a second guide area for the nozzle needle and which is designed to pass fuel radially outside the second guide area, is introduced in a partial area of the cross-sectional expansion of the recess.
- 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 bush makes it possible to dispense with reducing the cross-sectional area of the nozzle needle in the second guide region. This enables a very high rigidity of the nozzle needle to be ensured. A high rigidity of the nozzle needle enables precise movement of the nozzle needle even with a small available stroke of the actuator.
- the at least one cross-sectional widening of the recess increases the volume available for the fluid to be metered in the recess upstream of the guide bushing. In this way, pressure pulsations of the fluid in the region of the recess can be damped, which after the injection nozzle has been released. that arise after the injection nozzle is closed. This leads on the one hand to a more precise metering of fluid and on the other hand also increases the service life of the nozzle body.
- the guide bush is fixed in the recess of the nozzle body by means of a press fit.
- the nozzle assembly has a coupling element which is fixed on the nozzle needle by means of a press fit. An axial end of a bellows is coupled to the coupling element. Furthermore, a spring holder is coupled to the coupling element, on which an axial end of a return spring for the nozzle needle is supported.
- the nozzle needle can thus be made from a material that is easy to harden, regardless of suitable material properties for other connection methods with the coupling element, such as welding.
- both the return spring and the bellows can be coupled to the nozzle needle by means of the coupling element.
- the spring holder is sleeve-shaped.
- the bellows and the return spring can be arranged axially overlapping.
- a shorter axial length of the nozzle needle is necessary, which results in a higher rigidity of the nozzle needle.
- the bellows is coupled at its other axial end to a sleeve which is applied to the nozzle needle and is radially sealingly coupled to a cover plate which has a recess which penetrates the nozzle needle.
- a cover plate which has a recess which penetrates the nozzle needle.
- cover plate is coupled to the nozzle body by means of a laser solder connection.
- a laser solder connection only very localized heating, which is very low compared to welding, is necessary. This makes it easy to ensure that, for example, the stiffness of the return spring does not change during this connection process.
- FIG. 1 shows a section through an injection valve with a nozzle body
- FIG. 2 shows a further section through the nozzle body according to FIG. 1. Elements of the same construction or function are identified by the same reference symbols.
- An injection valve which is often also referred to as an injector (FIG. 1), has an injector housing 1, in which an actuator designed as a piezo actuator 2 is arranged. Furthermore, a compensating element 4, which is preferably a hydraulic compensating element, is preferably arranged in the injector housing 1 and thus compensates for different thermal expansion coefficients of the piezo actuator 2 and of the injector housing 1.
- the injection valve further comprises a nozzle body 6 with a recess 8, into which a nozzle needle 10 is inserted.
- An injection nozzle 12 is formed at an axial end of the recess 8.
- the nozzle needle 10 is axially movable in the recess 8. In its closed position, which is shown in FIG. 1, it prevents fuel flow through the injection nozzle 12.
- a suitable axial expansion of the piezo actuator 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 12.
- a first guide region 14 is formed on the wall of the recess 8 in the axial vicinity of the injection nozzle 12. Following the first guide area 14, the recess 8 has a first widening 16 of its cross section at a corresponding axial distance, then a second widening 18 of its cross section. It can also have additional cross-sectional extensions. The recess 8 can thus be produced by simply drilling with drills of different diameters.
- a guide bushing 20 is introduced into the recess 8 in the region of the second enlargement 18 of the cross section.
- the guide bushing 20 has a second guide area 22 for the nozzle needle 10. It is preferably pressed with the nozzle body 6. Furthermore, it is designed for the passage of fuel which can be supplied to the recess 8 via a high-pressure bore 26.
- the guide bushing 20 preferably has partial areas on its radial circumference, which are set back radially in comparison to the radius of the recess 8 in the area of the second enlargement 18 of the cross section. This can easily be achieved with one or more flat surfaces. This then has the consequence that a gap 24 is formed in a partial region of the circumference of the guide bush 20 between it and the nozzle body. In one or more other partial areas of the circumference of the guide bushing 20, this then lies against the nozzle body by means of the press fit. This is shown on the basis of the section in FIG. 2.
- the fuel in the region of the guide bush 20 can also be passed through the recess 8 by another suitable design of the guide bush 20.
- one or more axial bores can be formed radially outside of the second guide region 22 in the guide bushing.
- Both the nozzle body 6 and the guide bush 20 are preferably formed from a readily hardenable material, preferably a steel with a high carbon content. In this way, a high hardness that is favorable for the guide regions 14, 22 can be easily achieved.
- a return spring 28 is also arranged, which is supported at its one free axial end on a shoulder 30 of the nozzle body 1. If necessary, a shim can also be inserted between the shoulder 30 and the one free axial end of the return spring 28.
- the return spring 28 is supported on a spring holder 32, specifically on a collar 34 of the spring holder 32.
- the spring holder 32 is mechanically coupled to the nozzle needle 10 by means of a coupling element 36 and prestresses it into its closed position.
- the spring holder 32 preferably, but not necessarily, has a sleeve-shaped region which extends in the axial direction coaxially with the nozzle needle 10.
- the spring holder 32 is coupled to the coupling element 36 in a particularly simple manner by means of a form fit. However, it can also be coupled to the coupling elements 36, for example by welding or soldering.
- the coupling element 36 is coupled to the nozzle needle 10 by means of a press fit.
- the nozzle needle for applying the coupling element 36 is preferably coated with a lubricant comprising Teflon, and then the coupling element 36 is pressed onto the nozzle needle 10 with a corresponding force by applying it accordingly.
- the press fit between the coupling element 36 and The nozzle needle 10 has the advantage that welding, which is otherwise necessary for mechanically coupling the coupling element 36 to the nozzle needle 10, can be dispensed with, and the nozzle needle can therefore be made from a very hardenable material which is generally unsuitable 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.
- the bellows 38 is coupled to a sleeve 40, likewise preferably by means of a welded connection.
- the sleeve 40 is also sealingly connected to a cover plate 42 on its outer circumference.
- 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 in the recess 8 does not reach the piezo actuator 2.
- the cover plate 42 is preferably connected in the area 44 to the nozzle body 6 by means of a laser solder connection.
- a silver-containing solder is preferably used as the solder.
- Silver-containing solder is characterized by a relatively low melting temperature and thus the thermal energy required during the soldering process is relatively low.
- soldering by means of a laser is distinguished by the fact that the thermal energy can be supplied very precisely locally and can therefore also be supplied in a correspondingly local manner, which means that the adjacent components heat up only marginally during the soldering. This is particularly in connection with the return spring 28 of advantage, since their spring stiffness can change permanently if the return spring 28 is heated accordingly high.
- 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.
- the formation of the nozzle clamping nut 46, the nozzle body 6, the cover plate 42 and the injector housing 1, as shown in FIG. 1, ensures that no strong tensile forces have to be transmitted in the area 44.
- the preferred soldered connection between the cover plate 42 and the nozzle body 6 must therefore essentially only be able to fulfill a sealing function.
- the nozzle body 6 can also be welded to the cover plate 42.
- the coupling element 36 and the spring holder 32 can also be designed independently of the guide bushing 20.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004024119A DE102004024119B4 (de) | 2004-05-14 | 2004-05-14 | Düsenbaugruppe und Einspritzventil |
| PCT/EP2005/051985 WO2005111407A1 (de) | 2004-05-14 | 2005-05-02 | Düsenbaugruppe und einspritzventil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1745210A1 true EP1745210A1 (de) | 2007-01-24 |
| EP1745210B1 EP1745210B1 (de) | 2008-09-10 |
Family
ID=34968376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05743039A Expired - Lifetime EP1745210B1 (de) | 2004-05-14 | 2005-05-02 | Düsenbaugruppe und einspritzventil |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7934669B2 (de) |
| EP (1) | EP1745210B1 (de) |
| JP (1) | JP4473915B2 (de) |
| DE (2) | DE102004024119B4 (de) |
| WO (1) | WO2005111407A1 (de) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007024221B4 (de) * | 2007-05-15 | 2011-06-16 | Lechler Gmbh | Verfahren zum Herstellen einer Hochdrucksprühdüse und Hochdrucksprühdüse |
| DE102010042476A1 (de) * | 2010-10-14 | 2012-04-19 | Robert Bosch Gmbh | Vorrichtung zum Einspritzen von Kraftstoff |
| DE102011087005A1 (de) * | 2011-11-24 | 2013-05-29 | Robert Bosch Gmbh | Ventil zum Zumessen eines strömenden Mediums |
| WO2013122317A1 (ko) | 2012-02-13 | 2013-08-22 | 현대중공업 주식회사 | 가스 주입용 체크밸브 구동장치 |
| 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 (de) | 2019-02-11 | 2020-08-13 | Liebherr-Components Deggendorf Gmbh | Düse eines Kraftstoffinjektors und Kraftstoffinjektor mit einer solchen Düse |
| JP7506861B2 (ja) * | 2020-10-26 | 2024-06-27 | 株式会社リコー | 液体吐出ヘッドおよび液体吐出装置 |
| DE102021203738A1 (de) * | 2021-04-15 | 2022-10-20 | Robert Bosch Gesellschaft mit beschränkter Haftung | Gasinjektor mit kurzer axialer Bauweise |
| DE102022206220A1 (de) | 2022-06-22 | 2023-12-28 | Robert Bosch Gesellschaft mit beschränkter Haftung | Brennstoffventil zur dosierten Abgabe von Brennstoff |
| DE102023111573A1 (de) * | 2023-05-04 | 2024-11-07 | Man Energy Solutions Se | Kraftstoffinjektor einer Brennkraftmaschine und Brennkraftmaschine |
Family Cites Families (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US4938193A (en) * | 1987-06-15 | 1990-07-03 | Stanadyne Automotive Corp. | Fuel injection nozzle |
| US4790055A (en) * | 1987-06-15 | 1988-12-13 | Stanadyne, Inc. | Method of assembling a fuel nozzle assembly |
| US4785156A (en) * | 1987-12-18 | 1988-11-15 | American Telephone And Telegraph Company | Soldering method using localized heat source |
| JP3560174B2 (ja) * | 1994-05-17 | 2004-09-02 | 株式会社デンソー | 流体噴射ノズル及びそれを用いた燃料噴射弁 |
| DE4440182C2 (de) * | 1994-11-10 | 2003-09-18 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| DE19633260A1 (de) * | 1996-08-17 | 1998-02-19 | Bosch Gmbh Robert | Einspritzventil, insbesondere zum direkten Einspritzen von Kraftstoff in einen Brennraum eines Verbrennungsmotors |
| DE19736682A1 (de) * | 1997-08-22 | 1999-02-25 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| JP3704957B2 (ja) * | 1998-07-06 | 2005-10-12 | いすゞ自動車株式会社 | インジェクタ |
| GB9819746D0 (en) * | 1998-09-11 | 1998-11-04 | Lucas Ind Plc | Fuel injector |
| DE19912665A1 (de) | 1999-03-20 | 2000-09-21 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| DE19946766C2 (de) | 1999-09-29 | 2001-07-26 | Siemens Ag | Injektor für eine Brennkraftmaschine mit Direkteinspritzung |
| 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 (de) | 2000-08-11 | 2002-02-28 | Siemens Ag | Dosierventil mit einem hydraulischen Übertragungselement |
| FR2815085B1 (fr) * | 2000-10-05 | 2005-07-08 | Denso Corp | Structure perfectionnee d'injecteur de carburant destinee a eviter l'injection d'une quantite excessive de carburant |
| EP1323177A1 (de) | 2000-10-06 | 2003-07-02 | General Electric Company | Lampenhalterung mit einem halterungsrohr |
| US6739528B2 (en) * | 2000-10-11 | 2004-05-25 | Siemens Automotive Corporation | Compensator assembly having a flexible diaphragm and an internal filling tube for a fuel injector and method |
| DE10054182A1 (de) * | 2000-11-02 | 2002-05-29 | Siemens Ag | Fluiddosiervorrichtung mit Drosselstelle |
| WO2002036959A2 (de) * | 2000-11-02 | 2002-05-10 | Siemens Aktiengesellschaft | Fluiddosiervorrichtung mit drosselstelle |
| US6991187B2 (en) * | 2000-11-13 | 2006-01-31 | Siemens Automotive Corporation | Magneto-hydraulic compensator for a fuel injector |
| US6499471B2 (en) * | 2001-06-01 | 2002-12-31 | Siemens Automotive Corporation | Hydraulic compensator for a piezoelectrical fuel injector |
| DE10159749A1 (de) * | 2001-12-05 | 2003-06-12 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| DE10204655A1 (de) * | 2002-02-05 | 2003-08-28 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| US6749127B2 (en) * | 2002-02-11 | 2004-06-15 | Siemens Vdo Automotive Corporation | Method of filling fluid in a thermal compensator |
| DE10217594A1 (de) * | 2002-04-19 | 2003-11-06 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| EP1497553B1 (de) * | 2002-04-22 | 2010-01-13 | Continental Automotive GmbH | Dosiervorrichtung für fluide, insbesondere kraftfahrzeug-einspritzventil |
| DE10226649A1 (de) * | 2002-06-14 | 2004-01-08 | Siemens Ag | Dosiervorrichtung für Fluide, insbesondere Kraftfahrzeug-Einspritzventil |
| DE10232193A1 (de) | 2002-07-16 | 2004-02-05 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
| DE602005002758T2 (de) * | 2004-01-13 | 2008-07-24 | Delphi Technologies, Inc., Troy | Kraftstoffeinspritzventil |
| DE602005005242T2 (de) * | 2004-04-26 | 2009-04-02 | Isuzu Motors Ltd. | Längen-Ausgleichselement und dieses enthaltendes Kraftstoff-Einspritzventil |
-
2004
- 2004-05-14 DE DE102004024119A patent/DE102004024119B4/de not_active Expired - Fee Related
-
2005
- 2005-05-02 WO PCT/EP2005/051985 patent/WO2005111407A1/de not_active Ceased
- 2005-05-02 EP EP05743039A patent/EP1745210B1/de not_active Expired - Lifetime
- 2005-05-02 DE DE502005005334T patent/DE502005005334D1/de not_active Expired - Lifetime
- 2005-05-02 JP JP2007512179A patent/JP4473915B2/ja not_active Expired - Fee Related
- 2005-05-02 US US11/569,106 patent/US7934669B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005111407A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US7934669B2 (en) | 2011-05-03 |
| DE102004024119A1 (de) | 2005-12-08 |
| WO2005111407A1 (de) | 2005-11-24 |
| JP4473915B2 (ja) | 2010-06-02 |
| DE502005005334D1 (de) | 2008-10-23 |
| DE102004024119B4 (de) | 2006-04-20 |
| JP2007537391A (ja) | 2007-12-20 |
| US20070210189A1 (en) | 2007-09-13 |
| EP1745210B1 (de) | 2008-09-10 |
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