EP1378657A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
EP1378657A2
EP1378657A2 EP03012487A EP03012487A EP1378657A2 EP 1378657 A2 EP1378657 A2 EP 1378657A2 EP 03012487 A EP03012487 A EP 03012487A EP 03012487 A EP03012487 A EP 03012487A EP 1378657 A2 EP1378657 A2 EP 1378657A2
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
coupler
valve according
membrane
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
EP03012487A
Other languages
German (de)
English (en)
Other versions
EP1378657A3 (fr
EP1378657B1 (fr
Inventor
Michael Huebel
Rene Deponte
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 EP1378657A2 publication Critical patent/EP1378657A2/fr
Publication of EP1378657A3 publication Critical patent/EP1378657A3/fr
Application granted granted Critical
Publication of EP1378657B1 publication Critical patent/EP1378657B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M61/04—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
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • EP 0 477 400 A1 describes an arrangement for an in Adaptive mechanical acting stroke direction Tolerance compensation for a displacement transformer piezoelectric actuator for a fuel injector known.
  • the actuator acts on a master piston that is connected to a hydraulic chamber.
  • About the Pressure increase in the hydraulic chamber becomes a slave piston which moves a mass to be driven, to be positioned emotional.
  • This mass to be driven is, for example Valve needle of a fuel injector.
  • the hydraulic chamber is filled with a hydraulic fluid. With an expansion of the actuator and compression of the Hydraulic fluid in the hydraulic chamber flows a little Part of the hydraulic fluid with a defined leak rate. In the resting phase of the actuator, this hydraulic fluid added.
  • DE 195 00 706 A1 describes a hydraulic one Known displacement transformer for a piezoelectric actuator, where a master piston and a slave piston in one common axis of symmetry are arranged and the Hydraulic chamber is arranged between the two pistons.
  • a spring is arranged, which Pushes master cylinder and slave piston apart, whereby the master piston in the direction of the actuator and the slave piston in one working direction towards a valve needle be biased.
  • this lifting movement is carried out by the Pressure of a hydraulic fluid in the hydraulic chamber on the Transfer slave piston because the hydraulic fluid in the Hydraulic chamber can not be compressed and only one low proportion of hydraulic fluid due to annular gaps between master piston and a guide bore and Slave piston and a pilot hole during the short Period of a stroke can escape.
  • a disadvantage of this known prior art is that during a discharge period in which Hydraulic chamber there is no high pressure Hydraulic fluid can evaporate. However, there is a gas compressible and builds only with a strong one Volume reduction a correspondingly high pressure. The Master cylinder can now be pressed into its guide hole be, without there being a power transmission to the Master piston comes.
  • a further disadvantage is that cavitation of the Fuel can come when the spring has a high tension exercises on the master cylinder and slave cylinder and the Movement of the actuator to its starting position very quickly he follows. The negative pressure that forms in the hydraulic chamber can then lead to cavitation and the resulting damage lead on components.
  • the fuel injector according to the invention with the has characteristic features of the main claim in contrast, the advantage that the hydraulic coupler over a membrane and a corrugated pipe seal is sealed that a coupler volume and a compensation volume are formed with a highly viscous hydraulic medium are filled. On the one hand, this increases the tendency to cavitation reduced by the hydraulic medium. On the other hand, the the actuator housing sealing membrane that the Actuator housing not subjected to high fuel pressures is and therefore remains free of forces.
  • the membrane is advantageously U-shaped and is connected to a flange and the master piston.
  • Another advantage is that a membrane space on the outflow side the membrane for further absorption of the coupling medium Available.
  • the Compensation volume have two separate areas that are separated from each other by another membrane.
  • Drilling a compensating hole to accommodate Coupling medium, for example between the membrane space and the area of the hydraulic medium Compensation volume or between that with fuel filled area of the compensation volume and the Fuel channel.
  • the fuel injector 1 is as Fuel injector 1 for fuel injection systems for mixture-compressing, spark ignition internal combustion engines for the direct injection of fuel into the combustion chamber of the Internal combustion engine suitable.
  • the fuel injector 1 includes a piezoelectric or magnetostrictive actuator 2, which is in an actuator housing 3 is encapsulated.
  • the actuator 2 is an electrical Connection 4, which is connected by an electrical line 5 is contacted.
  • the actuator 2 is supported downstream on an actuating element 6, which by means of a spring 7, which is located on a housing shoulder 8 supports, is biased against the actuator 2.
  • the Actuator housing 3 is not suitable with a suitable one in FIG. 1 further illustrated seal against that Fuel injector 1 flowing fuel sealed. By sealing the actuator housing 3 is the actuator 2 against both mechanical and chemical Influences protected.
  • the hydraulic one Coupler 10 includes a master piston 11 and one Slave piston 12, which through a coupler gap 13th are spaced from each other.
  • the master piston 11 and the Slave pistons 12 are arranged in a guide sleeve 14.
  • the master piston 11 and the slave piston 12 can have the same or different cross-sectional areas, to implement the stroke of the actuator 2 or in a ratio up to 1: 3.
  • the fuel injector 1 is in the present case as an outward opening Fuel injector 1 formed, a Valve closing body 17 with a valve seat 18, which is formed on a nozzle body 19 to a sealing seat interacts.
  • the valve closing body 17 is on downstream end of the valve needle 16 is formed.
  • the fuel is supplied via a central fuel supply 21 at an inlet end 22 of the Fuel injector 1 supplied and over Fuel channels 23 to the hydraulic coupler 10 and Sealing seat led.
  • the fuel also serves as Coupler medium.
  • 2A and 2B are preferred below Embodiments of the invention shown and in Following explained in more detail.
  • the same components are in all figures with the same reference numerals. 2A and 2B is that in FIG. 1 with II shown section.
  • the actuator 2 is not included due to the design high system pressure, which seals the Actuator 2 against the coupler medium, the reset of the Master piston 11 when closing the Fuel injector 1 and the provision of a Compensation volume for displaced coupler medium through sufficient elasticity of the sealing corrugated tube 9 is possible.
  • the hydraulic coupler 10 is as a whole unit trained and through various sealing measures sealed against the fuel.
  • the hydraulic coupler 10 is through a thin-walled elastomer membrane 30 arranged, which is a compensation volume 31 between the Elastomer membrane 30 and a flange 32 defined.
  • the Compensation volume 31 is also available via a leakage gap 33 a coupler volume 34 in the coupler gap 13 in connection.
  • the coupler medium is through a steel membrane 35, which between the master piston 11 and the Flange 32 arranged and with the respective component is preferably welded, sealed.
  • a corrugated tube 36 seals the coupler medium from the fuel pressure of up to 20 MPa and also serves as Return spring for the slave piston 12 during the Fuel injector closing phase 1.
  • the corrugated pipe 36 is with the slave piston 12 and one Support member 37 welded, which at the same time as Guide for the slave piston 12 is used.
  • the elastomer membrane 30 is against the fuel via a clamping sleeve 44 sealed.
  • the fuel is on fuel channels 23 am hydraulic coupler 10 over towards the sealing seat directed.
  • the actuator 2 When the actuator 2 is actuated, it expands Outflow direction and acts via the actuating element 6 on the master piston 11 of the hydraulic coupler 10.
  • the hydraulic medium transmits the fast movement of the Actuator 2 via the coupler gap 13 onto the slave piston 12 and from there to the valve needle 16, whereby the Valve closing body 17 lifts off the valve seat surface 18 and fuel in the combustion chamber of the internal combustion engine is injected. Due to the speed of the Movement of the actuator 2 behaves like the hydraulic medium similar to a solid. With slow movements of the Actuator 2, for example, due to thermal influences Hydraulic medium through the leakage gap 33 in the Compensation volume displaced 31, making an arbitrary Opening of the fuel injector 1 is prevented.
  • the compensation volume 31 is one corrugated tubular elastomer membrane 39 provided which Compensation volume 31 in a first area 40, in which there is coupler medium and a second area 41, in which fuel pressure is present.
  • the invention is not shown on the Embodiments limited and also for any other designs of fuel injection valves 1, in particular fuel injectors that open inside, suitable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20030012487 2002-07-04 2003-06-02 Injecteur de carburant Expired - Lifetime EP1378657B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002130089 DE10230089A1 (de) 2002-07-04 2002-07-04 Brennstoffeinspritzventil
DE10230089 2002-07-04

Publications (3)

Publication Number Publication Date
EP1378657A2 true EP1378657A2 (fr) 2004-01-07
EP1378657A3 EP1378657A3 (fr) 2008-03-05
EP1378657B1 EP1378657B1 (fr) 2010-08-11

Family

ID=29719463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030012487 Expired - Lifetime EP1378657B1 (fr) 2002-07-04 2003-06-02 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1378657B1 (fr)
DE (2) DE10230089A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450034A1 (fr) * 2003-02-24 2004-08-25 Robert Bosch Gmbh Injecteur de carburant
EP1452727A1 (fr) * 2003-02-27 2004-09-01 Robert Bosch Gmbh Injecteur de carburant
WO2004076845A1 (fr) * 2003-02-27 2004-09-10 Robert Bosch Gmbh Soupape d'injection de carburant
WO2005054725A1 (fr) * 2003-12-05 2005-06-16 Siemens Aktiengesellschaft Dispositif, procede pour produire ledit dispositif ; dispositif de chambre et dispositif de transfert
US7500648B2 (en) 2003-02-27 2009-03-10 Robert Bosch Gmbh Fuel-injection valve
EP2199591A1 (fr) * 2008-12-15 2010-06-23 Robert Bosch GmbH Coupleur hydraulique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004031790A1 (de) 2004-07-01 2006-01-26 Robert Bosch Gmbh Common-Rail-Injektor
DE102005041668B4 (de) * 2005-09-02 2016-03-31 Robert Bosch Gmbh Injektor mit direkter Nadelsteuerung
DE102005041667B4 (de) * 2005-09-02 2016-05-12 Robert Bosch Gmbh Injektor mit direkter Nadelsteuerung
DE102017208269A1 (de) * 2017-05-17 2018-11-22 Robert Bosch Gmbh Förderaggregat für eine Brennstoffzellenanordnung zum Fördern und Steuern von einem gasförmigen Medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477400A1 (fr) 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Dispositif compensateur de tolérance dans la direction de mouvement du transformateur de déplacement d'un dispositif d'actionnement piézoélectrique
DE19500706A1 (de) 1995-01-12 1996-07-18 Bosch Gmbh Robert Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0656162B2 (ja) * 1987-03-03 1994-07-27 トヨタ自動車株式会社 ストロ−ク可変装置
DE4005455A1 (de) * 1989-02-28 1990-08-30 Volkswagen Ag Zumessventil, insbesondere kraftstoff-einspritzventil fuer eine brennkraftmaschine
JPH0587189A (ja) * 1991-09-26 1993-04-06 Nissan Motor Co Ltd 振動吸収装置
DE19646847A1 (de) * 1996-11-13 1997-06-12 Heinz Schmidt Anordnung eines modularen hydraulischen Stellwegtransformators mit variierbarem Übersetzungsverhältnis zur Übersetzung von Stellwagen von Festkörperenergiewandlern oder dergleichen
DE19813983A1 (de) * 1998-03-28 1999-09-30 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE19950760A1 (de) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10046323B4 (de) * 2000-09-19 2004-02-12 Siemens Ag Hydraulisches Spielausgleichssystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477400A1 (fr) 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Dispositif compensateur de tolérance dans la direction de mouvement du transformateur de déplacement d'un dispositif d'actionnement piézoélectrique
DE19500706A1 (de) 1995-01-12 1996-07-18 Bosch Gmbh Robert Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450034A1 (fr) * 2003-02-24 2004-08-25 Robert Bosch Gmbh Injecteur de carburant
EP1452727A1 (fr) * 2003-02-27 2004-09-01 Robert Bosch Gmbh Injecteur de carburant
WO2004076845A1 (fr) * 2003-02-27 2004-09-10 Robert Bosch Gmbh Soupape d'injection de carburant
US7500648B2 (en) 2003-02-27 2009-03-10 Robert Bosch Gmbh Fuel-injection valve
WO2005054725A1 (fr) * 2003-12-05 2005-06-16 Siemens Aktiengesellschaft Dispositif, procede pour produire ledit dispositif ; dispositif de chambre et dispositif de transfert
US7726625B2 (en) 2003-12-05 2010-06-01 Continental Automotive Gmbh Device, method for producing the device, chamber device and transfer device
EP2199591A1 (fr) * 2008-12-15 2010-06-23 Robert Bosch GmbH Coupleur hydraulique

Also Published As

Publication number Publication date
DE50312965D1 (de) 2010-09-23
DE10230089A1 (de) 2004-01-15
EP1378657A3 (fr) 2008-03-05
EP1378657B1 (fr) 2010-08-11

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