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EP1806497B1 - Kraftstoffeinspritzventil - Google Patents

Kraftstoffeinspritzventil Download PDF

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Publication number
EP1806497B1
EP1806497B1 EP20060000410 EP06000410A EP1806497B1 EP 1806497 B1 EP1806497 B1 EP 1806497B1 EP 20060000410 EP20060000410 EP 20060000410 EP 06000410 A EP06000410 A EP 06000410A EP 1806497 B1 EP1806497 B1 EP 1806497B1
Authority
EP
European Patent Office
Prior art keywords
injector
cup
shaped
recess
calibration pin
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.)
Active
Application number
EP20060000410
Other languages
English (en)
French (fr)
Other versions
EP1806497A1 (de
Inventor
Alessandro Morelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP20060000410 priority Critical patent/EP1806497B1/de
Priority to DE200660018105 priority patent/DE602006018105D1/de
Publication of EP1806497A1 publication Critical patent/EP1806497A1/de
Application granted granted Critical
Publication of EP1806497B1 publication Critical patent/EP1806497B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to an injector.
  • the injector comprises an injector body which has a recess and a needle which is arranged in the recess of the injector body.
  • the needle prevents a fluid flow through an injection nozzle of the injector body in a closed position of the needle and otherwise the needle enables the fluid flow through the injection nozzle.
  • the injector further comprises an actor which is coupled to the needle and a spring which is arranged in the recess of the injector body and which is coupled to at least a part of the actor.
  • EP 1 296 057 A1 discloses an integrated fuel filter and calibration tube for a fuel injector.
  • the integrated fuel filter and calibration tube for the fuel injector is preferably made from a filtration element.
  • the filtration element comprises filtration media insert molded into a thermoplastic frame member.
  • the integrated fuel filter and calibration tube is made from a metal calibration tube wretchedly attached to the filtration element.
  • the calibration tube is sized so as to fit inside of a fuel injector flow channel.
  • Document US 5 340 032 A shows also a similar integrated fuel filter for a fuel injector.
  • the object of the invention is to create an injector which enables a precise dosing of fluid in an easy way.
  • the invention is distinguished by an injector.
  • the injector comprises an injector body, a needle, an actor, a spring, and a cup-shaped calibration pin.
  • the injector body has a recess.
  • the needle is arranged in the recess of the injector body.
  • the needle prevents a fluid flow through an injection nozzle of the injector body in a closed position of the needle and otherwise enables the fluid flow through the injection nozzle.
  • the actor is coupled to the needle.
  • the spring is arranged in the recess of the injector body and is coupled to at least a part of the actor.
  • the cup-shaped calibration pin is made of one piece and comprises a tube-shaped portion and a perforated bottom portion. The cup-shaped calibration pin is coupled to the spring and is fixed into the recess of the injector body in such a way that the spring is preloaded by the cup-shaped calibration pin in a given way.
  • the perforated bottom portion of the cup-shaped calibration pin enables to omit an internal filter which is arranged in the cup-shaped calibration pin.
  • This enables to design the cup-shaped calibration pin more space saving, especially, this enables to design the cup-shaped calibration pin shorter respectively its axial length than it would be possible with the internal filter while having a comparable filtering of the fluid.
  • the shorter axial length of the injector contributes to a more precise dosing of fluid by the injector.
  • the use of the cup-shaped calibration pin for filtering the fluid may enable to have a bigger filtering area than with the internal filter.
  • the cup-shaped calibration pin is, fixed into the recess of the injector body by a press-fit. This contributes to a proper calibration of the injector.
  • the tube-shaped bottom portion comprises a first axial section which joins to the bottom portion.
  • the tube-shaped portion comprises a second axial section which has a larger diameter than the first axial section.
  • the second axial section is coupled to a wall of the recess of the injector body. This enables to fix the cup-shaped calibration pin with its second axial section into the injector by a press-fit while using the first axial section as a filter.
  • the tube-shaped portion of the cup-shaped calibration pin has a perforated area. This increases a filtering area and so this contributes to a proper fluid flow through the cup-shaped calibration pin while having the proper filtering of the fluid.
  • the perforated area of the tube-shaped portion of the cup-shaped calibration pin extends over the whole first axial section. This contributes to a proper fluid flow through the cup-shaped calibration pin while having a proper filtering of the fluid in an easy way.
  • perforations of the perforated bottom portion and/or, respectively, perforations of the perforated area of the tube-shaped portion of the cup-shaped calibration pin have a diameter in a dimension of some micrometers. This contributes in an easy way to a proper fluid flow through the perforations while having a proper filtering of the fluid.
  • the perforated bottom portion and the perforated area of the cup-shaped calibration pin have an area of 60 to 120 mm 2 . This contributes to a proper fluid flow through the cup-shaped calibration pin while having a proper filtering of the fluid in an easy way.
  • An injector ( figure 1 ) has an injector body with a recess of the injector body.
  • the injector body comprises an inlet tube 4, a coil housing 5, an injector housing 6, a valve body 4, a valve body shell 7, and a needle body.
  • the recess of the valve body comprises a recess 8 of the valve body 4 which takes in a part of the needle body movable in axial direction.
  • the injector is suitable for dosing a fluid.
  • the injector is suited for dosing fuel into a combustion chamber of an internal combustion engine.
  • the needle body may comprise a needle 10, a needle body recess and an armature 12.
  • the needle body recess comprises a recess 18 of the armature 12.
  • the armature 12 is fixed to the needle 10.
  • the recess 8 of the valve body 4 takes in the needle 10 and preferably part of the armature 12.
  • the needle body may be made of one piece or the needle body may comprise further parts of the needle body.
  • a recess 16 of the inlet tube 2 is provided which further extends to the recess 18 of the armature 12.
  • a spring 14 is arranged in the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12. The spring 14 is mechanically coupled to the needle 10.
  • the injection nozzle 24 may, for example, be an injection hole.
  • the injection nozzle 24 may also be of some other type suitable for dosing fluid.
  • the seat 26 may be made of one piece with the valve body 4 or may also be a separate part from the valve body 4. Additionally, a lower guide 28 for guiding the needle 10 may be provided. Additionally, a swirl disk 30 may be provided.
  • the injector is provided with a drive which is preferably an electromagnetic drive.
  • the electromagnetic drive may comprise a coil 36, which is preferably extrusion-coated, and the armature 12.
  • the armature 12 comprises a larger diameter then the needle 10. The larger diameter enables a proper electromagnetic flow through the armature 12 which contributes to a proper controllability of the movement of the needle body.
  • the coil 36 gets energized, an electromagnetic force acts on the needle body.
  • the electromagnetic force acts against the mechanical force obtained from the spring 14.
  • the coil 36 may be de-energized again.
  • the needle body and, in particular, the needle 10 may be moved away from its closed position which results in a fluid flow through the injection nozzle 24.
  • a cup-shaped calibration pin 40 is arranged in the recess 16 of the inlet tube 4. At a first axial end of the cup-shaped calibration pin 40 facing towards the spring 14 the cup-shaped calibration pin 40 is coupled to the spring 14. The cup-shaped calibration pin 40 is arranged in such a way that the spring 14 is preloaded.
  • the cup-shaped calibration pin 40 comprises a perforated bottom portion 42 ( figure 2 ) for having a cheap and space saving filter for filtering the fluid which enters the injector.
  • the cup-shaped calibration pin 40 further comprises a tube-shaped portion 44.
  • the tube-shaped portion 44 comprises a first axial section 46 and a second axial section 48.
  • the second axial section 48 has an interference fit related to the recess 16 of the inlet tube 4. The interference fit easily enables to fix the cup-shaped calibration pin 40 into the recess 16 of the inlet tube 4.
  • the first axial section 46 has a smaller diameter than the second axial section 48. In combination with a perforated area at the first axial section 46 this enables a large filtering area.
  • the perforated bottom portion 42 and the perforated area of the first axial section 46 have an area of preferably 60 to 120 mm 2 .
  • a free single perforation of the perforated bottom portion 42 and/or the perforated area of the first axial section 46 has a diameter in the dimension of some micrometers, for example 30 micrometers.
  • the area of the perforated area and the perforated bottom portion 42 and the dimension of the perforations contribute to a proper fluid flow through the cup-shaped calibration pin 40 while having the proper filtering of the fluid.
  • the cup-shaped calibration pin 40 is made of one piece.
  • the perforations may be formed in the cup-shaped calibration pin 40 by laser drilling or by photo incision.
  • the injector gets calibrated.
  • the cup-shaped calibration pin is sticked into the recess 16 of the inlet tube 4 and the spring 14 gets preloaded by the cup-shaped calibration pin 40.
  • the cup-shaped calibration pin 40 is inserted into the recess 16 of the inlet tube 4 and while the preload on the spring 14 increases, the fluid is dosed by the injector.
  • the dosed fluid is detected. While detecting the dosed fluid the cup-shaped calibration pin 40 is moved further into the recess 16 of the inlet tube 4 towards the spring 14 and so the preload on the spring 14 increases further.
  • the fluid is dosed by the injector in a given way, the movement of the cup-shaped calibration pin 40 towards the spring 14 is stopped and the cup-shaped calibration pin 40 is fixed in its position. So, the spring 14 is preloaded in a given way. This enables a precise dosing of fluid by the injector.
  • the cup-shaped calibration pin 40 for filtering fluid and for calibrating the injector enables to omit an internal filter.
  • an internal filter is disclosed in the cited prior art. It is very space saving to omit the internal filter.
  • the axial length of the cup-shaped calibration pin 40 can be designed shorter than it is possible, for example, in the cited prior art.
  • the shorter cup-shaped calibration pin 40 enables to design the whole injector shorter, than it would be possible with the internal filter while having a comparable filtering of the fluid.
  • the shorter the injector is the more stable is the injector.
  • the shorter the injector is the bigger a force can be which acts in axial direction on the injector without destroying the injector or a part of the injector.
  • the longer the injector is the bigger is the effect of vibrations of the injector at a tip of the injector which comprises the injection nozzle 24. So, the shorter the injector is the more precise is the dosing of fluid by the injector.

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)

Claims (7)

  1. Injektor, umfassend:
    einen Injektorkörper, der eine Aussparung aufweist,
    eine Nadel (10), die in der Aussparung des Injektorkörpers angeordnet ist und einen Fluidfluss durch eine Injektordüse (24) des Injektorkörpers in einer geschlossenen Position der Nadel (10) verhindert und anderenfalls den Fluidfluss durch die Injektordüse (24) freigibt,
    einen Aktor (36, 12), der an die Nadel (10) gekoppelt ist,
    eine Feder (14), die in der Aussparung des Injektorkörpers angeordnet ist und an mindestens einen Teil des Aktors (36, 12) gekoppelt ist,
    ein becherförmiger Kalibrationsstift (40), der aus einem Stück gefertigt ist und einen rohrförmigen Bereich (44) umfasst, der einen perforierten Bodenbereich (42) aufweist, der an die Feder (14) gekoppelt ist und in der Aussparung des Injektorkörpers derart befestigt ist, dass die Feder (14) durch den becherförmigen Kalibrationsstift in einer vorgegebenen Weise vorgespannt ist.
  2. Injektor gemäß Anspruch 1, während der becherförmige Kalibrationsstift (40) in der Aussparung des Injektorkörpers mittels eines Presssitzes befestigt ist.
  3. Injektor gemäß einem der vorhergehenden Ansprüche, während der rohrförmige Bereich (44) einen ersten axialen Abschnitt (46) aufweist, der an den Bodenbereich (42) angrenzt, während der rohrförmige Bereich (44) einen zweiten axialen Abschnitt (48) umfasst, der einen größeren Durchmesser als der erste axiale Abschnitt (48) aufweist und an eine Wand der Aussparung des Injektorkörpers gekoppelt ist.
  4. Injektor gemäß einem der vorhergehenden Ansprüche, während der rohrförmige Bereich (44) des becherförmigen Kalibrationsstifts (40) einen perforierten Bereich aufweist.
  5. Injektor gemäß Anspruch 4, während der perforierte Bereich des rohrförmigen Bereichs (44) des becherförmigen Kalibrationsstifts (40) sich über den gesamten ersten axialen Abschnitt (46) erstreckt.
  6. Injektor gemäß einem der vorhergehenden Ansprüche oder gemäß Anspruch 4 oder 5, während die Perforationen des perforierten Bodenbereichs (42) und/oder des entsprechenden perforierten Bereichs des rohrförmigen Bereichs (44) des becherförmigen Kalibrationsstifts (40) einen Durchmesser in einer Abmessung von einigen µm aufweisen.
  7. Injektor gemäß einem der vorhergehenden Ansprüche, während der perforierte Bodenbereich (42) und der perforierte Bereich des becherförmigen Kalibrationsstifts (40) einen Bereich von 60 bis 120 mm2 aufweisen.
EP20060000410 2006-01-10 2006-01-10 Kraftstoffeinspritzventil Active EP1806497B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20060000410 EP1806497B1 (de) 2006-01-10 2006-01-10 Kraftstoffeinspritzventil
DE200660018105 DE602006018105D1 (de) 2006-01-10 2006-01-10 Kraftstoffeinspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060000410 EP1806497B1 (de) 2006-01-10 2006-01-10 Kraftstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP1806497A1 EP1806497A1 (de) 2007-07-11
EP1806497B1 true EP1806497B1 (de) 2010-11-10

Family

ID=36498689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060000410 Active EP1806497B1 (de) 2006-01-10 2006-01-10 Kraftstoffeinspritzventil

Country Status (2)

Country Link
EP (1) EP1806497B1 (de)
DE (1) DE602006018105D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007049963A1 (de) * 2007-10-18 2009-04-23 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102009045347A1 (de) * 2009-10-06 2011-04-07 Robert Bosch Gmbh Kraftstofffilter für ein Kraftstoffeinspritzventil
EP2426351B1 (de) * 2010-09-02 2014-11-12 Continental Automotive GmbH Verstellbare Brennstofffilteranordnung und Einspritzventil
EP2811151A1 (de) * 2013-06-04 2014-12-10 Continental Automotive GmbH Filter für ein Kraftstoffeinspritzventil, Kraftstoffeinspritzventil und Verfahren zur Herstellung eines Filters für ein Kraftstoffeinspritzventil
DE102014225999A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Brennstoffeinspritzventil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131535A1 (de) * 1991-09-21 1993-03-25 Bosch Gmbh Robert Elektromagnetisch betaetigbares einspritzventil
US5921475A (en) * 1997-08-07 1999-07-13 Ford Motor Company Automotive fuel injector
DE10220632A1 (de) * 2001-05-10 2002-12-12 Denso Corp Filter und Brennstoffeinspritzeinrichtung mit demselben
DE60238813D1 (de) 2001-09-19 2011-02-17 Filtertek Inc Integrierter Kraftstofffilter und Kalibrierungsrohr für ein Kraftstoffeinspritzventil
JP3841054B2 (ja) * 2002-08-08 2006-11-01 株式会社デンソー フィルタおよびそれを用いた燃料噴射装置

Also Published As

Publication number Publication date
EP1806497A1 (de) 2007-07-11
DE602006018105D1 (de) 2010-12-23

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