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EP2519730B1 - Injecteur de fluide - Google Patents

Injecteur de fluide Download PDF

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Publication number
EP2519730B1
EP2519730B1 EP10779003.2A EP10779003A EP2519730B1 EP 2519730 B1 EP2519730 B1 EP 2519730B1 EP 10779003 A EP10779003 A EP 10779003A EP 2519730 B1 EP2519730 B1 EP 2519730B1
Authority
EP
European Patent Office
Prior art keywords
injection valve
pipe
bore
valve according
housing
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.)
Not-in-force
Application number
EP10779003.2A
Other languages
German (de)
English (en)
Other versions
EP2519730A1 (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

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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
    • 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 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 into the valve chamber radial opening in the nozzle body and welded or soldered to the nozzle body.
  • the pipe is attached to the inlet nozzle and firmly connected to the inlet nozzle.
  • US 2002/0179062 also discloses a fuel injector with a fluid carrying tube.
  • 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 withstand high fuel pressures in the injector with reliable tightness withstands.
  • 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 opens below the internal thread in the blind hole bottom.
  • 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
  • a second sealing element is disposed within the threaded connection of the inner and outer threads, which may for example also be formed as a PTFE sealing ring.
  • leaks possibly via the first sealing element, may occur 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.
  • a check of the tightness of the first sealing element can be made via the leakage bore.
  • 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, which can be advantageously 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 sealing element previously inserted into the external thread of the connecting piece automatically produces a reliable seal of the threaded connection between the connecting piece and 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.
  • the screwing of the inlet nozzle in the connection piece increases the robustness of the injection valve against rough operation.
  • the interface between the connector and pipe or inlet nozzle is sealed, which is preferably realized by a circumferential on the surface of the connector weld or solder seam on the pipe or inlet nozzle. In such an additional seal can be omitted if, according to an advantageous embodiment of the invention, a plastic body is sprayed onto the connector, which partially surrounds the inlet nozzle.
  • injection valve shown for a fluid eg for fuel in a fuel supply system for internal combustion engines, has, for example, a sleeve-like valve housing 11, whose one end of the housing is closed by a nozzle body 12 and the other end of the housing is covered by a connector 13.
  • Nozzle body 12 and connecting piece 13 are fixedly connected to the valve housing 11, for example, by a respective peripheral weld 14, 15.
  • a valve seat 16 ejection opening 17 is formed.
  • the valve seat 16 is preceded by a valve chamber 18.
  • valve needle 19 slidably guided in the nozzle body 12 emerges through the valve chamber 18 and is pressed onto the valve seat 16 with a closing head 191 by a valve closing spring 20 supporting the nozzle body 12 and the valve needle 19 while closing the ejection opening 17.
  • a valve closing spring 20 supporting the nozzle body 12 and the valve needle 19 while closing the ejection opening 17.
  • opening valve needle 19 is a piezoelectric actuator 21 which is received in series with a hydraulic coupler 22 in the valve housing 11 and clamped between the valve needle 19 and connector 13 axially frictionally. Structure and function of actuator 21 and coupler 22 are known and, for example, in the DE 103 19 599 A1 or DE 10 2007 028 490 A1 described.
  • an inlet nozzle 23 is arranged for attaching a fuel supply line.
  • a guided through the valve housing 11 tube 30 establishes a fluid connection between the inlet nozzle 23 and the valve chamber 18.
  • a radially offset from the housing axis of the valve housing 11 arranged axial blind hole 24 formed with internal thread and the tube 30 is screwed at its end remote from the inlet pipe end 23 by means of an external thread in the internal thread.
  • the thread connection of internal and external threads is in FIG. 2 denoted by 25.
  • 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 inserted with a reduced diameter pin 261 in the pipe end and welded or soldered thereto, as in FIG. 2 sketched weld 27 illustrated.
  • 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.
  • the transverse bore 28 is radially introduced into the nozzle body 12 and sealed at the end remote from the blind hole 24 by means of a pressed ball 29 pressure-tight.
  • In the threaded connection 25 at least one sealing element 31 is arranged, which reliably prevents fluid leakage from the blind bore 24 into the interior of the valve housing 11, in which the non-fuel-resistant actuator 21 rests.
  • 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.
  • sealing element 31 instead of the embodiment of the sealing element 31 as such a sealing ring 32 and the inner or outer thread of the threaded connection 25 with a sealing layer of an elastomer, such as Teflon coated, which also produces a reliable seal between the threads when screwed.
  • a sealing layer of an elastomer such as Teflon coated
  • valve housing 11 between the housing wall and the 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 in 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 35 in FIG. 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.
  • a plastic body 36 is sprayed onto the connecting piece 13, which hermetically encloses the inlet nozzle 23 in the lower portion facing the connecting piece 13.
  • the through-bore 34 in the connection piece 13 is sealed in a fluid-tight manner and on the other hand the inlet connection 23 is stabilized. If the sprayed-on plastic body 36 is dispensed with, the passage of the tube 30 through the connecting piece 13 is sealed off, which is preferably carried out by a weld around the tube 30 on the surface of the connecting piece 13.
  • a leakage bore 37 is still introduced into the nozzle body 12, which opens in the blind hole 24 in the region of the threaded connection 25.
  • a second sealing element 38 is disposed within the threaded connection 25.
  • the second sealing element 38 is formed identically to the first sealing element 31, and thus in turn has a sealing ring made of PTFE, which rests in an annular groove 33 in the connecting piece 26. Again, a coating of one of the threads of the threaded connection 25 with a sealing layer is possible.
  • the second sealing element 38 seals the leakage bore 37 against the interior of the valve housing 18.
  • the purpose of the leakage bore 37 is to remove any leaks which may occur via the first sealing element 31, e.g. in the crankcase of the internal combustion engine.
  • 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.
  • FIG. 3 in longitudinal section injection valve is modified in comparison with the injection valve described above in that the first sealing 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 (FIG. FIG. 4 ) is available.
  • annular shoulder 40 On this annular shoulder 40 is an annular sealing washer 41 made of PTFE.
  • the 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 nozzle 23 and fitting 13 is in FIG. 3 marked 42.
  • For fluid-tight passage of the tube 30 through the connecting piece 13 of the inlet nozzle 23 is connected via a circumferential weld 43 with the connector 13.
  • the weld 43 can be omitted if - as with the injection valve in FIG. 1 is made - on the connector body 13 a the inlet nozzle 23 partially enclosing plastic body 36 is sprayed, as shown in FIG. 3 indicated by dash-dotted lines.
  • injection valve is correct FIG. 3 with the in FIG. 1 represented injection valve, so that the same components are provided with the same reference numerals.

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  • 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 (12)

  1. Soupape d'injection pour un fluide, en particulier pour du carburant, comprenant un boîtier de soupape (11), une tubulure d'amenée (23) pour le fluide disposée à une extrémité de boîtier du boîtier de soupape (11), un corps de buse (12) disposé à l'autre extrémité de boîtier, qui présente un siège de soupape (16) entourant une ouverture de pulvérisation (17) et une chambre de soupape (18) montée en amont de celui-ci, et un tube (30) conduisant les fluides, s'étendant dans le boîtier de soupape (11), lequel relie la chambre de soupape (18) à la tubulure d'amenée (23), un trou borgne axial (24) disposé de manière décalée radialement par rapport à l'axe de boîtier du boîtier de soupape (11) étant réalisé dans le corps de buse (12) et une liaison fluidique étant établie du trou borgne (24) à la chambre de soupape (18), caractérisée en ce que le tube (30) est vissé au niveau de son extrémité de tube du côté de la chambre de soupape au moyen d'un filetage extérieur dans un filetage intérieur du trou borgne (24) et en ce que la connexion filetée (25) du filetage intérieur et du filetage extérieur est rendue étanche par rapport au trou borgne (24) au moyen d'au moins un élément d'étanchéité (31).
  2. Soupape d'injection selon la revendication 1, caractérisée en ce que la liaison fluidique entre le trou borgne (24) et la chambre de soupape (18) est formée par un alésage transversal (28) s'étendant dans le corps de buse (12), lequel débouche en dessous du filetage intérieur dans la base du trou borgne.
  3. Soupape d'injection selon la revendication 1 ou 2, caractérisée en ce que l'au moins un élément d'étanchéité (31) est une bague d'étanchéité (32), de préférence en PTFE, qui est introduite dans une rainure annulaire (33) à l'intérieur du filetage extérieur.
  4. Soupape d'injection selon la revendication 3, caractérisée en ce que l'au moins un élément d'étanchéité (31) est une rondelle d'étanchéité de forme annulaire (41), de préférence en PTFE, qui est pressée par engagement par force axialement sur un épaulement annulaire (40) dans le trou borgne (24) disposé avant l'embouchure de la liaison fluidique.
  5. Soupape d'injection selon l'une quelconque des revendications 2 à 4, caractérisée en ce qu'un alésage de fuite (37) conduisant vers l'extérieur débouche dans le trou borgne (24) au-dessus de l'au moins un élément d'étanchéité (21) dans la région du filetage intérieur et un deuxième élément d'étanchéité (38) est disposé au-dessus de l'alésage de fuite (37) dans la région de la connexion filetée (25).
  6. Soupape d'injection selon la revendication 5, caractérisée en ce que le deuxième élément d'étanchéité (38) est une bague d'étanchéité (32), de préférence en PTFE, qui est introduite dans une rainure annulaire (33) à l'intérieur du filetage extérieur.
  7. Soupape d'injection selon la revendication 1 ou 2, caractérisée en ce que l'au moins un élément d'étanchéité (38) est formé par une couche d'étanchéité constituée d'un élastomère, de préférence de téflon, avec laquelle est revêtu l'un des filetages de la connexion filetée (25).
  8. Soupape d'injection selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le filetage extérieur est disposé sur une pièce de connexion (26) cylindrique creuse, séparée du tube (30), qui est placée à l'extrémité du tube, de préférence qui est partiellement insérée dans celle-ci, et qui est connectée fixement au tube (30).
  9. Soupape d'injection selon la revendication 8, caractérisée en ce que le tube (30) est guidé dans une ouverture traversante (34) coaxiale au trou borgne (24) dans le corps de buse (12) dans une pièce de raccordement (13) recouvrant le boîtier de soupape (11) au niveau de son extrémité de boîtier opposée au corps de buse (12) et a une longueur axiale dimensionnée de telle sorte qu'il fasse saillie axialement au-delà de la pièce de raccordement (13) lorsque la pièce de connexion (26) est complètement vissée dans le trou borgne (24), et en ce que la tubulure d'amenée (23) est posée sur l'extrémité de tube saillante et est connectée fixement à celle-ci, de préférence par pressage et soudage.
  10. Soupape d'injection selon la revendication 9, caractérisée en ce que la tubulure d'amenée (23) porte un filetage extérieur qui peut être vissé dans un filetage intérieur réalisé dans l'alésage traversant (34).
  11. Soupape d'injection selon la revendication 9 ou 10, caractérisée en ce que la tubulure d'amenée (23) est entourée en partie par un corps en plastique (36) moulé par injection sur la pièce de raccordement (13).
  12. Soupape d'injection selon la revendication 9 ou 10, caractérisée en ce que le tube (30) ou la tubulure de raccordement vissée (23) est étanchéifié(e) par rapport à l'alésage traversant (34) dans la pièce de raccordement (13), de préférence par un joint de soudure ou de brasage sur la surface de la pièce de raccordement (13) placé autour du tube (30) ou de la tubulure de raccordement (23).
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 EP2519730A1 (fr) 2012-11-07
EP2519730B1 true 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

Also Published As

Publication number Publication date
WO2011080002A1 (fr) 2011-07-07
DE102009055362A1 (de) 2011-06-30
CN102713237B (zh) 2015-05-20
US8757512B2 (en) 2014-06-24
CN102713237A (zh) 2012-10-03
US20110309164A1 (en) 2011-12-22
EP2519730A1 (fr) 2012-11-07

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