EP1606508A1 - Brennstoffeinspritzventil - Google Patents
BrennstoffeinspritzventilInfo
- Publication number
- EP1606508A1 EP1606508A1 EP04704534A EP04704534A EP1606508A1 EP 1606508 A1 EP1606508 A1 EP 1606508A1 EP 04704534 A EP04704534 A EP 04704534A EP 04704534 A EP04704534 A EP 04704534A EP 1606508 A1 EP1606508 A1 EP 1606508A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- injection valve
- actuator
- valve according
- fuel
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 89
- 238000002347 injection Methods 0.000 title claims abstract description 42
- 239000007924 injection Substances 0.000 title claims abstract description 42
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000005538 encapsulation Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000006223 plastic coating Substances 0.000 claims 1
- 238000007765 extrusion coating Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- 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
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9015—Elastomeric or plastic materials
Definitions
- the invention relates to a fuel injector according to the preamble of the main claim.
- DE 35 33 085 AI discloses a metering valve for metering liquids or gases, in particular an injection valve for fuel injection systems in internal combustion engines, which has a piezo stack actuator, the change in length of which is transmitted to a valve needle controlling a metering opening when an excitation voltage is applied, and determines the stroke of the valve needle.
- the substance to be measured is fed via a feed line, which is designed in the form of a deep hole in the valve body.
- a disadvantage of the injection valve known from DE 35 33 085 AI is that the housing of the injection valve is very solid and thus heavy and voluminous. It requires a large installation space and increased material and manufacturing costs.
- the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the fuel inlet is arranged centrally and is modularly constructed from a connecting piece, a tube and the actuator foot of the actuator, whereby the fuel is guided through the interior of the fuel injector and a solid housing with a deep hole can be omitted.
- Plastic encapsulation of the fuel feed with molded fastening and contact connections can be produced in a simple and inexpensive manner.
- the individual components of the fuel feed are advantageously produced by turning and connected to one another by means of welding.
- the fuel feed is constructed in two parts, the individual components being able to be produced by turning or deep drawing and then being welded to one another in the region of the tube.
- the fuel supply is sealed against plastic encapsulation by means of labyrinth seals.
- bores in the actuator base allow the actuator to be encapsulated for heat conduction after the preassembly.
- FIG. 1 shows a schematic section through the upstream part of a
- 3A-C are schematic sections through further preferred embodiments of fuel injection valves designed according to the invention.
- the fuel injector 1 shown in FIG. 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.
- the fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
- the fuel injector 1 comprises a housing 2, in which a piezoelectric or magnetostrictive actuator 4 provided with an actuator coating 3 is arranged. An electrical voltage can be applied to the actuator 4 by means of an electrical line 5, on which an electrical connection 6 protruding from the housing 2 can be formed are fed.
- the actuator 4 is supported on the inflow side on an actuator base 7 and on the outflow side on an actuator head 8.
- a biasing spring 9 acts on the actuator 4 with a bias.
- the housing 2 has a bore 10 which leads the fuel line from an inlet connection 11 to a sealing seat (not shown)
- Fuel injector 1 is used.
- the bore 10 is made in the housing 2 parallel to the actuator 4 and made in two parts.
- a first section 12 is introduced obliquely into the housing 2 and extends from the inlet connection 11 to a second section 13 which extends in a straight line through the housing over its entire axial extent.
- the reason for the two-part design is the impossibility of producing a kinking bore 10 inexpensively and simply in one operation.
- the second section 13 is closed on the inflow side of an opening 14 into the first section 12 with a closure body 15.
- a disadvantage of this manufacturing method for the bore 10 for the fuel line is the solid housing 2, which must have a minimum wall thickness so that a bore 10 with a sufficient diameter can be introduced. As a result, the fuel injector 1 is very solid. A corresponding receiving bore in a cylinder head of the internal combustion engine must also be large enough to accommodate the fuel injector 1.
- Fig. 2A and 2B show in two mutually 'vertical-sectional planes along a longitudinal axis 16 of the fuel injection valve 1, a first embodiment of a fuel injector 1 according to the invention, which has a variably configurable fuel supply 17th
- the fuel inlet 17 includes a tube 18 which is inserted into a bore 19 of the actuator base 7 and with the Actuator foot 7 is preferably connected via a weld seam 20.
- a connecting piece 21 is placed on an upstream end of the tube 18 and is preferably also connected to the tube 18 by a weld 20.
- the connecting piece 21 is, for. B. produced in a simple manner as a turned part.
- the preassembled components 7, 18 and 21 are provided with a plastic encapsulation 22, to which the electrical connection 6 is molded in the exemplary embodiment.
- the fuel supplied through the connecting piece 21 is passed through the tube 18 ' and the bore 19 in the actuator base 7. Radial bores 23 in the actuator foot 7 guide the fuel into an interior 24 of the fuel injector 1.
- the fuel flows around an actuator cartridge 25, in which the actuator 2 provided with the actuator coating 3 is encapsulated together with the actuator head 8 and the biasing spring 9.
- the actuator cartridge 25 is connected to the actuator base 7 via a further weld 20 on the downstream side of the radial bores 23, just as the housing 2 of the fuel injector 1 is connected to this on the inflow side via a weld 20.
- Labyrinth seals 35 provide the seal between the plastic encapsulation 22 and the actuator base 7 and with the connecting piece 21.
- the actuator cartridge 25 is sealed against the fuel by means of a seal 26, which can be designed, for example, as a corrugated tube seal 26.
- the housing 2 of the fuel injector 1 is advantageously formed in one piece.
- the advantage of a fuel supply 17 as shown in FIG. 2A is, in particular, the possibility of being able to adapt the fuel supply to individual installation situations by means of a modular structure without great effort.
- the omission of a deep hole and the associated high wall thickness of the housing are also advantageous.
- the fuel injector designed according to the invention 1 is slim due to the thin-walled housing 2 and therefore does not require much installation space.
- the cross section of the tube 18 can be selected so that pressure pulsations in the fuel injector 1 can be avoided and the metering dynamics can be improved.
- the plastic encapsulation 22 can be shaped variably and can include the plug connection 6 and further fastening elements.
- the fuel injection valve 1 has an actuating element 27 for a valve needle 28 on the downstream side of the actuator cartridge 25, which valve valve comprises at its downstream end a valve closing body 29 which forms a sealing seat with a valve seat surface 30 formed on the housing 2.
- a guide element 31 with fuel channels 32 centers the valve needle 28 in the interior 24 of the fuel injector 1.
- a return spring 33 holds the fuel injector 1, which in the present exemplary embodiment is designed as an outwardly opening fuel injector 1, in the unloaded state of the actuator 4 and ensures that the actuator 4 is switched off Excitation voltage for the resetting of the valve needle 28.
- FIG. 2B shows a further section through the fuel injector 1 shown in FIG. 2A along the line IIB-IIB in FIG. 2A to clarify the measures according to the invention.
- the actuator base has at least one, in the exemplary embodiment two axial bores 34, which can be used to insert the actuator overmold 3 after the assembly of the actuator cartridge 25 and before the injection of the fuel inlet 17. This mainly fulfills the task of heat dissipation from actuator 2.
- 3A to 3C show further advantageous design variants of a fuel injector 1 designed according to the invention.
- the same components are provided with the same reference numerals in all the figures.
- 3A shows an embodiment variant in which the connecting piece 21, the tube 18 and the actuator base 7 are designed as a one-piece rotating part.
- two of the weld seams 20 shown in FIGS. 2A and 2B between the connecting piece 21 and the tube 18 and between the tube 18 and the actuator base 7 can be omitted.
- the disadvantage is the long turning time for the turned part provided with several shoulders and the labyrinth seals 35.
- FIG. 3B shows a variant which is slightly modified compared to FIG. 3A and which combines the advantages of a weld seam 20 which is omitted with simple manufacture of two components to be combined with one another.
- a first pipe section 36 of the pipe 18 and the connecting piece 21 are made in one piece, by turning and connected by means of a weld seam 20 to a second pipe section 37 of the pipe 18, which in turn is made in one piece with the actuator base 7 by turning.
- the fuel inlet 17 is also formed in two parts, as in FIG. 1, the downstream component comprising the actuator base 7 and the second pipe section 37 being identical to FIG. 3B, but the first pipe section 36 being designed as a deep-drawn part with a molded-on collar 38 and with the second pipe section 37 is also connected via a weld seam 20.
- the invention is not restricted to the exemplary embodiments shown and is suitable for any designs of fuel injection valves 1.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003110789 DE10310789A1 (de) | 2003-03-12 | 2003-03-12 | Brennstoffeinspritzventil |
DE10310789 | 2003-03-12 | ||
PCT/DE2004/000099 WO2004081368A1 (de) | 2003-03-12 | 2004-01-23 | Brennstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1606508A1 true EP1606508A1 (de) | 2005-12-21 |
EP1606508B1 EP1606508B1 (de) | 2009-12-30 |
Family
ID=32892080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04704534A Expired - Lifetime EP1606508B1 (de) | 2003-03-12 | 2004-01-23 | Brennstoffeinspritzventil |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1606508B1 (de) |
DE (2) | DE10310789A1 (de) |
WO (1) | WO2004081368A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005015256A1 (de) * | 2005-04-04 | 2006-10-05 | Robert Bosch Gmbh | Piezoaktor mit Labyrinthdichtung |
DE102005033138B4 (de) * | 2005-07-15 | 2017-12-14 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE102005040199A1 (de) * | 2005-08-25 | 2007-03-01 | Robert Bosch Gmbh | Piezoaktor mit Steckervorrichtung und ein Verfahren zu dessen Herstellung |
DE102007040509A1 (de) | 2007-08-28 | 2009-03-05 | Robert Bosch Gmbh | Piezoaktormodul mit einer Umhüllung des Piezoaktors und ein Verfahren zu dessen Herstellung |
DE102008008847A1 (de) * | 2008-02-13 | 2009-08-27 | Robert Bosch Gmbh | Kraftstoffinjektor mit einer direkt gesteuerten Ventilnadel |
DE102012204302A1 (de) * | 2012-03-19 | 2013-09-19 | Robert Bosch Gmbh | Umspritztes Bauelement mit einem Dichtlabyrinth |
DE102020213842A1 (de) | 2020-11-04 | 2022-05-05 | Robert Bosch Gesellschaft mit beschränkter Haftung | Einspritzventil für ein Wassereinspritzsystem eines Verbrennungsmotors sowie Wassereinspritzsystem mit einem solchen Einspritzventil |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3533085A1 (de) | 1985-09-17 | 1987-03-26 | Bosch Gmbh Robert | Zumessventil zur dosierung von fluessigkeiten oder gasen |
US5494225A (en) * | 1994-08-18 | 1996-02-27 | Siemens Automotive Corporation | Shell component to protect injector from corrosion |
DE19503821A1 (de) * | 1995-02-06 | 1996-08-08 | Bosch Gmbh Robert | Elektromagnetisch betätigbares Ventil |
DE19534445C2 (de) * | 1995-09-16 | 1998-07-30 | Man Nutzfahrzeuge Ag | Einspritzventil für Brennkraftmaschinen |
US5820099A (en) * | 1997-05-20 | 1998-10-13 | Siemens Automotive Corporation | Fluid migration inhibitor for fuel injectors |
DE19827136A1 (de) * | 1998-06-18 | 1999-12-23 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE19843570A1 (de) * | 1998-09-23 | 2000-03-30 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE19912665A1 (de) * | 1999-03-20 | 2000-09-21 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE19932760A1 (de) * | 1999-07-14 | 2001-01-18 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
JP2002319715A (ja) * | 2001-04-19 | 2002-10-31 | Denso Corp | 圧電体素子及びこれを用いたインジェクタ |
-
2003
- 2003-03-12 DE DE2003110789 patent/DE10310789A1/de not_active Withdrawn
-
2004
- 2004-01-23 WO PCT/DE2004/000099 patent/WO2004081368A1/de active Application Filing
- 2004-01-23 DE DE502004010587T patent/DE502004010587D1/de not_active Expired - Lifetime
- 2004-01-23 EP EP04704534A patent/EP1606508B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004081368A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004081368A1 (de) | 2004-09-23 |
DE502004010587D1 (de) | 2010-02-11 |
EP1606508B1 (de) | 2009-12-30 |
DE10310789A1 (de) | 2004-09-23 |
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