EP2519730A1 - Injecteur pour fluide - Google Patents

Injecteur pour fluide

Info

Publication number
EP2519730A1
EP2519730A1 EP10779003A EP10779003A EP2519730A1 EP 2519730 A1 EP2519730 A1 EP 2519730A1 EP 10779003 A EP10779003 A EP 10779003A EP 10779003 A EP10779003 A EP 10779003A EP 2519730 A1 EP2519730 A1 EP 2519730A1
Authority
EP
European Patent Office
Prior art keywords
blind hole
valve
fluid
housing
connecting piece
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
Application number
EP10779003A
Other languages
German (de)
English (en)
Other versions
EP2519730B1 (fr
Inventor
Dietmar Schmieder
Thomas Sebastian
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2519730A1 publication Critical patent/EP2519730A1/fr
Application granted granted Critical
Publication of EP2519730B1 publication Critical patent/EP2519730B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • 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
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention is based on an injection valve for a fluid, in particular for fuel, according to the preamble of claim 1.
  • valve housing encloses a circular cylindrical in cross-section cavity in which a
  • piezoelectric or magnetostrictive actuator is arranged for valve actuation.
  • the annular in cross-section housing wall is longitudinally radially thickened on one side and is provided in the thickening region with an axial bore in which the tube is guided.
  • the tube is bent at the lower end by about 90 ° and inserted into an opening in the valve chamber radial opening in the nozzle body and with the
  • Nozzle body welded or soldered. At the end facing away from the nozzle body, the pipe is attached to the inlet nozzle and firmly connected to the inlet nozzle.
  • the injection valve according to the invention with the features of claim 1 has the advantage that by the threaded connection between the fluid-carrying tube and the valve chamber containing nozzle body and by the at least one sealing element integrated in the threaded connection a connection between the nozzle body and tube, which is highly resilient and the increasingly required high
  • the fluid connection between the blind hole having the internal thread and the valve chamber is formed by a transverse bore extending in the nozzle body, which is below the
  • Valve chamber manufacturing technology realize very low.
  • the at least one sealing element is a sealing ring made of polytetrafluoroethylene (PTFE), which rests in an annular groove within the external thread.
  • PTFE polytetrafluoroethylene
  • Sealing element arranged, which may for example also be formed as a PTFE sealing ring. With the leakage hole can possibly over the first
  • Seal element occurring leaks to the outside, e.g. in the crankcase of the internal combustion engine, are passed. Since a pressure of about 5 bar usually prevails in the crankcase, it is ensured by the second sealing element that no leakage enters the interior of the valve housing, in which the non-fuel-resistant actuator for actuating the injection valve is arranged. In addition, via the leakage bore, a check of the tightness of the first sealing element
  • the external thread is formed on a hollow-cylindrical connecting piece separated from the tube and connected to the tube Pipe end attached, preferably partially inserted into this, and is firmly connected to the tube.
  • the connection is made by soldering or welding.
  • the tube is guided in a coaxial to the blind hole in the nozzle body passage opening, which is formed in a valve housing at its remote from the nozzle body housing end connecting piece.
  • the axial length of the tube is dimensioned so that it protrudes axially when fully screwed into the internal thread in the blind hole connector over the connector.
  • a prefabricatable assembly of inlet nozzle, pipe and connector is achieved in manufacturing technology advantageously advantageous that can be easily mounted by being inserted into the valve housing through the through hole in the connector and screwed into the blind hole in the nozzle body.
  • the previously used in the external thread of the connector is achieved in manufacturing technology advantageously advantageous that can be easily mounted by being inserted into the valve housing through the through hole in the connector and screwed into the blind hole in the nozzle body.
  • the connecting piece carries an external thread and is held in the through hole in the connecting piece an internal thread for screwing the connecting piece.
  • Inlet nozzle in the connection piece increases the robustness of the injection valve against rough operation. Both with only passed through the connector pipe and screwed inlet nozzle, the interface between the connector and pipe or inlet nozzle is sealed, which is preferably by a on the
  • Inlet nozzle is realized. In such an additional seal can be omitted if, according to an advantageous embodiment of the invention on the
  • FIG. 1 shows a longitudinal section of an injection valve for a fluid
  • Figure 2 is an enlarged view of the section II in Figure 1
  • Figure 3 is a same view as in Figure 1 of a modified injection valve
  • Figure 4 is an enlarged view of the section IV in Figure 3.
  • the injection valve shown in longitudinal section in FIG. 1, for a fluid, e.g. for fuel in a fuel supply system for internal combustion engines, has e.g. sleeve-like valve housing 1 1, whose one end of a housing of a nozzle body 12th
  • Nozzle body 12 and fitting 13 are fixedly connected to the valve housing 1 1, e.g. in each case by a circumferential weld seam 14, 15.
  • a spray opening 17 enclosed by a valve seat 16 is formed.
  • the valve seat 16 is preceded by a valve chamber 18.
  • Valve chamber 18 immersed in a nozzle body 12 slidably guided valve needle 19 therethrough, with a closing head 191 of a nozzle body 12 and on the valve needle 19 is supported valve closing spring 20 closing the
  • valve needle 19 For actuating the outwardly against the restoring force of the valve closing spring 20 opening valve needle 19 is a piezoelectric actuator 21 which is received in series with a hydraulic coupler 22 in the valve housing 1 1 and clamped between the valve needle 19 and connector 13 axially frictionally. Structure and function of actuator 21 and coupler 22 are known and described for example in DE 103 19 599 A1 or DE 10 2007 028 490 A1.
  • an inlet nozzle 23 is arranged for attaching a fuel supply line.
  • a guided through the valve housing 1 1 tube 30 provides a fluid connection between the
  • axial blind hole 24 formed with internal thread and screwed the tube 30 at its end remote from the inlet pipe end 23 by means of an external thread in the internal thread.
  • the threaded connection of inner and outer threads is designated 25 in FIG.
  • the external thread is not directly on the pipe end of the cut thin-walled tube 30, but on a thick-walled, hollow cylindrical connector 26 which is used with a reduced diameter pin 261 in the pipe end and welded or soldered thereto, as illustrated in Figure 2 weld 27 illustrates.
  • a fluid connection to the valve chamber 18 is made below the threaded connection 25.
  • This fluid connection is realized by means of a transverse bore 28, which opens in the blind hole 24, here in the blind hole bottom. As Figure 1 shows, the transverse bore 28 is radially in the
  • Nozzle body 12 introduced and sealed at the end remote from the blind hole 24 by means of a pressed ball 29 pressure-tight.
  • a sealing element 31 is arranged, which is a fluid leakage from the
  • non-fuel resistant actuator 21 rests reliably prevented.
  • the sealing element 31 is a
  • Sealing ring 32 made of polytetrafluoroethylene (PTFE), which rests in an inserted in the connecting piece 26 within the external thread into the connecting piece 26 into the annular groove 33.
  • PTFE polytetrafluoroethylene
  • the sealing ring 32 by means of a conical expanding mandrel, which covers the external thread up to the annular groove 33, expanded and snapped into the annular groove 33.
  • the sealing ring 32 seals the threads reliably even at high pressures.
  • the internal or external thread of the threaded connection 25 may also be provided with a sealing layer of an elastomer, e.g. Teflon, coated, which also produces a reliable seal between the threads when screwed.
  • the through the interior of the valve housing 1 1 between the housing wall and actuator 21 extending, fluid-carrying tube 30 is passed in a coaxial with the blind hole 24 inserted through hole 34 in the connector 13, wherein the length of the tube 30 is dimensioned so that it is completely into the internal thread in the blind hole 24 screwed connector 26 projects axially beyond the connector 13.
  • the inlet nozzle 23 is placed on the protruding pipe end and pressed with the pipe end and welded (weld seam 35 in Figure 1).
  • the tube 30, the connecting piece 26 and the inlet nozzle 23 are joined to form a structural unit. This unit is by the Through hole 34 in the connector 13 and passed through the connector 26 in the blind hole 24 of the nozzle body 12 is screwed.
  • the inlet nozzle 23 is provided with two diametrical flattened portions 231. After complete screwing of the connecting piece 26 in the blind hole 24, a plastic body 36 is sprayed onto the connecting piece 13, which is the
  • Inlet piece 23 hermetically encloses in its lower portion facing the connection piece 13. As a result, on the one hand, the through hole 34 in
  • Connector 13 is made.
  • in the nozzle body 12 is still a
  • Leakage bore 37 introduced, which opens in the blind hole 24 in the threaded connection 25.
  • a second sealing element 38 is disposed within the threaded connection 25.
  • Sealing element 38 is identical to the first sealing element 31 is formed, so in turn has a sealing ring made of PTFE, which in an annular groove 33 in
  • Connector 26 rests. Again, a coating of one of the threads of the threaded connection 25 with a sealing layer is possible.
  • Seal member 38 seals the leakage bore 37 against the interior of the
  • the leakage bore 37 has the task, possibly occurring
  • the leakage bore 38 allows leakage testing of the first seal member 31.
  • a bellows 39 is pushed onto the valve needle 19, wherein one end of the bellows on the valve needle 19 and the other end of the bellows on the nozzle body 12 is fixed fluid-tight.
  • the injector shown in longitudinal section in Figure 3 is modified in comparison with the injection valve described above in that the first seal member 31 is not designed as a radial seal, but as an axial seal.
  • the Sacklochgrund formed with a relative to the blind hole diameter smaller diameter, so that at the transition from the blind hole 24 to the blind hole bottom of the mouth of the transverse bore 28 upstream annular shoulder 40 ( Figure 4) is present.
  • an annular sealing washer 41 made of PTFE.
  • inlet nozzle 23 carries an external thread, which is screwed into a cut into the through hole 34 in the connector 13 internal thread.
  • the threaded connection between inlet connection 23 and connection piece 13 is marked 42 in FIG.
  • Inlet nozzle 23 connected via a peripheral weld 43 with the connector 13.
  • the weld 43 may be omitted if - as is done in the injection valve in Figure 1 - on the connector body 13 a the inlet nozzle 23 partially enclosing plastic body 36 is sprayed, as indicated in phantom in Figure 3. Otherwise, the injection valve according to FIG. 3 coincides with the injection valve shown in FIG. 1, so that identical components are provided with the same reference numerals.

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

L'invention concerne un injecteur pour un fluide, notamment du carburant, comprenant un carter (11), une tubulure d'admission (23) destinée au fluide et disposée à une extrémité du carter, un corps d'injecteur (12) disposé à l'autre extrémité du carter et doté d'un siège de soupape (16) entourant un orifice d'admission (17) et d'une chambre à soupape (18) montée en amont du siège de soupape, et un tube (30) qui achemine le fluide, s'étend dans le carter et relie la chambre à soupape (18) à la tubulure d'admission (23). Pour obtenir entre le tube (30) et la chambre à soupape (18), une liaison qui soit adaptée à la production, facile à monter et résistante à des pressions de service élevées, un trou borgne (24) doté d'un taraudage est pratiqué dans le corps d'injecteur (12), ledit trou borgne étant radialement décalé par rapport à l'axe du carter (11), et une communication fluidique étant créée entre le trou borgne (24) et la chambre à soupape (18). Le tube (30) est vissé, par son extrémité opposée à la tubulure d'admission (23), dans le trou borgne (24), et l'assemblage par filetage (26) est étanchéifié par rapport au trou borgne (24).
EP10779003.2A 2009-12-29 2010-11-12 Injecteur de fluide Not-in-force EP2519730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009055362A DE102009055362A1 (de) 2009-12-29 2009-12-29 Einspritzventil für ein Fluid
PCT/EP2010/067405 WO2011080002A1 (fr) 2009-12-29 2010-11-12 Injecteur pour fluide

Publications (2)

Publication Number Publication Date
EP2519730A1 true EP2519730A1 (fr) 2012-11-07
EP2519730B1 EP2519730B1 (fr) 2015-09-16

Family

ID=43569254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10779003.2A Not-in-force EP2519730B1 (fr) 2009-12-29 2010-11-12 Injecteur de fluide

Country Status (5)

Country Link
US (1) US8757512B2 (fr)
EP (1) EP2519730B1 (fr)
CN (1) CN102713237B (fr)
DE (1) DE102009055362A1 (fr)
WO (1) WO2011080002A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012204659A1 (de) * 2012-03-22 2013-09-26 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage
DE202012007128U1 (de) * 2012-07-23 2012-08-02 Robert Bosch Gmbh Ventil zum Zumessen von Fluid

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19540155C2 (de) * 1995-10-27 2000-07-13 Daimler Chrysler Ag Servoventil für eine Einspritzdüse
DE19941930A1 (de) * 1999-09-03 2001-03-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP4158338B2 (ja) * 2000-06-06 2008-10-01 株式会社デンソー インジェクタ用圧電体素子
DE10110678A1 (de) 2001-03-06 2002-10-02 Siemens Ag Dosiervorrichtung
US6499471B2 (en) 2001-06-01 2002-12-31 Siemens Automotive Corporation Hydraulic compensator for a piezoelectrical fuel injector
US6749127B2 (en) * 2002-02-11 2004-06-15 Siemens Vdo Automotive Corporation Method of filling fluid in a thermal compensator
DE10257895A1 (de) 2002-12-11 2004-06-24 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10319599A1 (de) 2003-05-02 2004-11-18 Robert Bosch Gmbh Aktoreinheit für ein piezogesteuertes Kraftstoffeinspritzventil
EP1561942B1 (fr) * 2004-01-29 2006-12-27 Siemens VDO Automotive S.p.A. Injecteur de liquide et son procédé de fabrication
DE102007028490A1 (de) 2007-06-21 2008-12-24 Robert Bosch Gmbh Koppler zur Hubübertragung mittels Scherkraft, Injektor, sowie Verfahren zur Hubübertragung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011080002A1 *

Also Published As

Publication number Publication date
DE102009055362A1 (de) 2011-06-30
US20110309164A1 (en) 2011-12-22
CN102713237B (zh) 2015-05-20
CN102713237A (zh) 2012-10-03
EP2519730B1 (fr) 2015-09-16
WO2011080002A1 (fr) 2011-07-07
US8757512B2 (en) 2014-06-24

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