WO2006029933A1 - Injecteur - Google Patents

Injecteur Download PDF

Info

Publication number
WO2006029933A1
WO2006029933A1 PCT/EP2005/053615 EP2005053615W WO2006029933A1 WO 2006029933 A1 WO2006029933 A1 WO 2006029933A1 EP 2005053615 W EP2005053615 W EP 2005053615W WO 2006029933 A1 WO2006029933 A1 WO 2006029933A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
injection
nozzle
needle
nozzle needle
Prior art date
Application number
PCT/EP2005/053615
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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
Priority to EP05775883A priority Critical patent/EP1792073A1/fr
Publication of WO2006029933A1 publication Critical patent/WO2006029933A1/fr

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
    • 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
    • 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
    • F02M2200/70—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 relates to an injection nozzle for an internal combustion engine, in particular in a motor vehicle, according to the preamble of claim 1.
  • Such an injection nozzle is known for example from US Pat. No. 6,520,423 B1 and has a nozzle needle which can be adjusted in a nozzle body for controlling an injection of fuel through at least one injection hole.
  • a piezoelectric actuator is also arranged, which in its operation, the nozzle needle or a the
  • Nozzle needle having needle assembly via a hydraulic coupling for opening or closing drives.
  • this hydraulic coupling has an actuator piston which is drive-connected to the piezoactuator and has a control surface which delimits a control space. Actuation of the piezoactuator drives the actuator piston to change a control chamber volume.
  • the known injection nozzle is the
  • Control chamber accommodated in a nozzle body fixed cylinder element, in which the actuator piston is immersed.
  • the needle bandage has at its end remote from the nozzle needle on a control piston, which has a nozzle needle facing pressure stage. This pressure level limits a coupling space that communicates with the control room.
  • the control piston by means of a
  • the nozzle needle is thus controlled directly to open via a pressure increase in the control room.
  • the hydraulic coupling required for this purpose has a comparatively complex structure, at the same time relatively high control pressures, which are already very high above the itself
  • Injection pressure must be controlled.
  • the injection nozzle according to the invention with the features of claim 1 has the advantage that the hydraulic coupling has a simplified structure. This is achieved by integrating a booster piston of the hydraulic coupling into the nozzle needle or the needle dressing. This booster piston and the actuator piston are arranged coaxially with each other, including the control space. Of particular importance in the invention is that the
  • Piezoaktuator to open the nozzle needle drives the actuator piston so that increases the control chamber volume. This has the consequence that the pressure drops in the control room, so that prevail on the needle assembly acting ⁇ ffhungs practice and can open the nozzle needle.
  • the control surface formed on the actuator piston is in this case facing the nozzle needle and therefore has to enlarge the control chamber volume of the
  • Control chamber is lowered relative to the injection pressure. As a result, the effort to control the pressure differences occurring is comparatively low.
  • annular translator space can be provided which at the free end of the respective outer piston of the hydraulic coupling the respective inner piston of the hydraulic coupling encloses, wherein the booster chamber is bounded by a trained at the free end of the outer piston translator surface and communicates with the control chamber substantially unthrottled.
  • a "4m substantially unthrottled" compound is understood to mean a compound which is throttled in a targeted manner compared to a
  • Connection contains no specifically provided throttle or throttling.
  • the hydraulic coupling may be arranged in a high-pressure space formed in the nozzle body, which is substantially unthrottled with the fuel under injection pressure
  • Fuel supply communicates.
  • the hydraulic coupling floats in the fuel and is on all sides acted upon by the injection pressure.
  • leaks between the individual components of the hydraulic coupling are not critical, which facilitates a low-cost production of the individual components.
  • FIG. 1 shows a highly simplified longitudinal section through an injection nozzle according to the invention.
  • an injection nozzle 1 has a nozzle body 2 in which a nozzle needle 3 is mounted so as to be adjustable in stroke.
  • the nozzle needle 3 serves to control at least one injection hole 4, which is formed in a tip 5 of the nozzle body 2.
  • the nozzle needle 3 acts together with a needle seat 6. When the nozzle needle 3 is open, the at least one injection hole is connected to a fuel supply 7 in the
  • Operation provides a standing under a relatively high injection pressure fuel.
  • the nozzle needle 3 When the nozzle needle 3 is open, an injection of fuel into an injection chamber 8 takes place.
  • the nozzle needle 3 When the nozzle needle 3 is closed, it sits in its needle seat 6 and blocks the connection between the at least one injection hole 4 and the fuel supply 7 so that no fuel injection takes place.
  • Nozzle needle 3 by its opening and closing the injection of fuel through the at least one injection hole. 4
  • the injection nozzle 1 is used for injecting fuel into the injection space 8 of an internal combustion engine, in particular in a motor vehicle. Usually everyone is
  • Cylinder of the internal combustion engine assigned its own injection nozzle 1.
  • the fuel supplies 7 are connected by a plurality of injection nozzles 1 to a common high-pressure fuel line.
  • the nozzle body 2 also contains a piezo actuator 9, which is fixed to the nozzle body 2 at an end remote from the at least one spray hole 4, increases in length when energized and thereby performs a stroke at its end closest to the injection port 4.
  • a piezo actuator 9 which is fixed to the nozzle body 2 at an end remote from the at least one spray hole 4, increases in length when energized and thereby performs a stroke at its end closest to the injection port 4.
  • At its least one injection port 4 facing the end of the piezo actuator 9 is characterized by a marked by a brace hydraulic coupling 10 with the nozzle needle 3 and with a
  • Düsennadel 3 comprehensive needle assembly 11 drive-coupled.
  • the piezoactuator 9 can drive the nozzle needle 3 for opening and closing by its actuation.
  • the hydraulic coupling 10 reduces mechanical wear between the piezoactuator 9 and the nozzle needle 3 or needle assembly 11.
  • the needle assembly 11 may consist solely of the nozzle needle 3. However, the needle assembly 11 preferably comprises, in addition to the nozzle needle 3, at least one further component, such as, for example, a piston and / or a piston rod which is not designated in more detail.
  • the individual components of the needle assembly 11 lie against one another in the axial direction and can transmit pressure forces to one another.
  • the components of Needle bandages 11 form a common hubver ause unit. Basically, adjacent components may rest loosely against each other. Likewise, adjacent components may be firmly connected. Furthermore, it is basically possible that at least two components of the needle assembly 11 are made in one piece.
  • the hydraulic coupling 10 comprises an actuator piston 12 which is drive-connected to the piezoactuator 9.
  • a stroke of the piezoactuator 9 thus leads directly to an identical stroke of the actuator piston 12.
  • a control surface 13 is formed, the one
  • the hydraulic coupling 10 further includes a booster piston 15 which is drivingly connected to the nozzle needle 3 and the needle assembly 11, such that a stroke of the booster piston 15 directly produces an identical stroke of the needle assembly 11 and thus the nozzle needle 3.
  • the booster piston 15 forms part of the needle assembly 11.
  • the booster piston 15 can be fixedly connected to a component of the needle assembly 11, in particular with the nozzle needle 3, or made in one piece with this.
  • the actuator piston 12 and the booster piston 15 are arranged coaxially with each other, wherein they include the control chamber 14.
  • the booster piston 15 is external, so that the
  • Actuator piston 12 is immersed in the booster piston 15.
  • the booster piston 15 thus encloses the control chamber 14 and the section of the actuator piston 12 immersed therein.
  • Section of the booster piston 15 encloses.
  • the booster piston 15 has an annular booster surface 16 facing away from the least one injection hole 4 and delimiting an annular booster chamber 17.
  • This translator chamber 17 is thus arranged at the free end of the booster piston 15 and annularly surrounds the actuator piston 12.
  • the booster chamber 17 communicates with the control chamber 14.
  • the actuator piston 12 to For this purpose, at least one bore 19, each connecting the control chamber 14 with the booster chamber 17.
  • axial grooves may be formed on the inner wall of the booster piston 15 and / or on the outer wall of the actuator piston 12. It is important that the chosen
  • Connection between the control chamber 14 and the translator chamber 17 is substantially unthrottled, that is, that a pressure change in the one room can propagate substantially instantaneously in the other room.
  • the booster chamber 17 is bounded radially inwardly by the actuator piston 12, the booster chamber 17 is bounded radially on the outside by a sealing sleeve 20, which is mounted on the outside of the booster piston 15 in a stroke-adjustable manner.
  • the sealing sleeve 20 is biased axially against the wall 18 by means of a sealing spring 21.
  • the sealing spring 21 is supported at one end on the side facing away from the wall 18 of the sealing sleeve 20 and the other end on a support ring 22 from.
  • the support ring 22 in turn is supported on the nozzle needle 3 or on the needle assembly 11. In this way, the sealing spring 21 simultaneously serves as a closing pressure spring for the needle assembly 11 and for the nozzle needle.
  • the nozzle body 2 contains in the region of the coupling between the piezoactuator 9 and
  • Nozzle needle 3 or Nadelval 11 a high-pressure chamber 23 which communicates with the fuel supply 7, and essentially unthrottled, so that the prevailing pressure in the fuel supply 7 quasi delay prevails in the high-pressure chamber 23.
  • the entire hydraulic coupling 10 is thus embedded in the high injection pressure, so the leaks within the hydraulic coupling 10 are not critical.
  • at least one connecting line 24 may be provided for coupling the high pressure chamber 23 with the fuel supply 7, for example.
  • the sealing sleeve 20 is designed or cooperates with the wall 18 so that the booster chamber 17 throttled communicates with the high-pressure chamber 23.
  • the sealing sleeve 20 may be pointed towards the wall 18 for this purpose.
  • the control chamber 14 is throttled through the booster chamber 17 with the high-pressure chamber 23 and thus with the fuel supply 7.
  • the nozzle needle 3 is equipped at least with a pressure stage 25, which is arranged so that it is acted upon when the nozzle needle 3 is closed with the injection pressure provided via the fuel supply 7.
  • the pressure stage 25 is in an annular space 26, the one
  • Part of the fuel supply 7 forms or is connected to this. Since the pressure stage 25 faces the at least one spray hole 4, the pressure acting thereon can introduce a force acting in the opening direction of the nozzle needle 3 into the nozzle needle 3. The pressure stage 25 is thus effective in the direction of opening.
  • the injection nozzle 1 operates as follows:
  • the nozzle needle 3 is closed, i. the nozzle needle 3 is seated in its needle seat 6 and separates the at least one injection hole 4 of the fuel supply 7. An injection of fuel thus does not take place.
  • Fuel supply 7 prevails the injection pressure.
  • the injection pressure is also applied to the pressure stage 25.
  • the injection pressure also prevails in the high-pressure chamber 23 and thus in the booster chamber 17 and in the control chamber 14.
  • the pressure in the control chamber 14 also acts on a closing pressure surface 27 remote from the nozzle needle 3 on the booster piston 15, whereby corresponding closing forces are introduced into the needle assembly 11 , Furthermore, 16 closing forces are introduced into the needle assembly 11 on the translator surface.
  • the restoring forces of the sealing spring 21 are oriented in the closing direction of the nozzle needle 3. Overall, prevails in needle assembly 11 in the closing direction resulting force.
  • the piezoactuator 9 is energized and thus has its greater length. Accordingly, the actuator piston 12 immersed maximally in the booster piston 15, so that the control chamber 14 has its minimum control chamber volume.
  • the energization of the piezo actuator 9 is terminated or interrupted.
  • the piezoactuator 9 shortens its length and pulls the actuator piston 12 back, whereby it moves away from the at least one injection hole 4.
  • the actuator piston 12 extends the booster piston 15, whereby the control chamber volume increases.
  • a fluid compensation By dimensioning the effective within the hydraulic coupling 10 surfaces (translator surface 16 and cross-sectional area of the actuator piston 12) in this case a transfer or reduction of the effective pressures and thus the resulting strokes can be achieved.
  • control chamber 14 and the booster chamber 17 are in any case adapted to the cross section of the actuator piston 12, that when retracting the actuator piston 12, an enlargement of the control chamber volume 14 and des
  • connection of the fuel supply 7 to at least one injection hole 4 opens. As a result, the injection of fuel into the injection space 8 take place.
  • the piezoelectric actuator 9 is energized again, whereby this again increases its length and the actuator piston 12 a stroke in the direction
  • Nozzle needle 3 executes. Accordingly, the actuator piston 12 moves into the booster piston 15 and thereby again reduces the volume of the control chamber 14, thereby increasing the pressure in the control chamber 14 and consequently also in the booster chamber 17 until the forces acting in the closing direction predominate on the needle dressing 11 and the nozzle needle 3 intimidverstellen in her needle seat 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur (1) pour moteur à combustion interne, notamment dans une automobile, qui comprend: un pointeau d'injecteur (3) à course ajustable dans un corps d'injecteur (2), pour réguler une injection de carburant à travers au moins un trou d'injection (4); un actionneur piézo-électrique (9) qui entraîne, lorsqu'il est actionné, le pointeau d'injecteur (3) ou un assemblage de pointeau (11) présentant le pointeau (3), par l'intermédiaire d'un accouplement hydraulique (10), pour ouvrir ou fermer; l'accouplement hydraulique (10) présente un piston d'actionneur (12) relié en entraînement à l'actionneur piézo-électrique (9), qui présente une surface de commande (13) délimitant un espace de commande (14); le fait d'actionner l'actionneur piézo-électrique (9) entraîne le piston d'actionneur (12), pour modifier un volume de l'espace de commande. L'invention vise à simplifier la conception de l'injecteur (1). A cet effet, il est prévu que l'accouplement hydraulique (10) présente un piston intensificateur (15), relié en entraînement au pointeau (3) ou à l'assemblage de pointeau (11). Le piston actionneur (12) et l'assemblage de pointeau (11) sont disposés coaxialement l'un à l'autre et renferment l'espace de commande (14). L'actionneur piézo-électrique (9) entraîne, pour ouvrir le pointeau d'injecteur (3), le piston actionneur (12), pour augmenter le volume de l'espace de commande.
PCT/EP2005/053615 2004-09-15 2005-07-25 Injecteur WO2006029933A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05775883A EP1792073A1 (fr) 2004-09-15 2005-07-25 Injecteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004044461.7 2004-09-15
DE200410044461 DE102004044461A1 (de) 2004-09-15 2004-09-15 Einspritzdüse

Publications (1)

Publication Number Publication Date
WO2006029933A1 true WO2006029933A1 (fr) 2006-03-23

Family

ID=35276616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053615 WO2006029933A1 (fr) 2004-09-15 2005-07-25 Injecteur

Country Status (4)

Country Link
EP (1) EP1792073A1 (fr)
CN (1) CN101023262A (fr)
DE (1) DE102004044461A1 (fr)
WO (1) WO2006029933A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008095743A1 (fr) * 2007-02-05 2008-08-14 Robert Bosch Gmbh Injecteur pour injecter du carburant dans des chambres de combustion de moteurs à combustion interne

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102213165B (zh) * 2010-04-08 2013-02-13 北京亚新科天纬油泵油嘴股份有限公司 高压共轨电控喷油器
EP2616661A1 (fr) * 2010-09-13 2013-07-24 International Engine Intellectual Property Company, LLC Injecteur de carburant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191A1 (de) * 1995-05-24 1996-12-19 Siemens Ag Einspritzventil
US6520423B1 (en) * 2000-03-21 2003-02-18 Delphi Technologies, Inc. Hydraulic intensifier assembly for a piezoelectric actuated fuel injector
US6561436B1 (en) * 1998-09-23 2003-05-13 Robert Bosch Gmbh Fuel injection valve
WO2004016942A1 (fr) * 2002-07-25 2004-02-26 Siemens Aktiengesellschaft Dispositif pour transmettre le deplacement d'un actionneur, muni d'une bague elastomere

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191A1 (de) * 1995-05-24 1996-12-19 Siemens Ag Einspritzventil
US6561436B1 (en) * 1998-09-23 2003-05-13 Robert Bosch Gmbh Fuel injection valve
US6520423B1 (en) * 2000-03-21 2003-02-18 Delphi Technologies, Inc. Hydraulic intensifier assembly for a piezoelectric actuated fuel injector
WO2004016942A1 (fr) * 2002-07-25 2004-02-26 Siemens Aktiengesellschaft Dispositif pour transmettre le deplacement d'un actionneur, muni d'une bague elastomere

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008095743A1 (fr) * 2007-02-05 2008-08-14 Robert Bosch Gmbh Injecteur pour injecter du carburant dans des chambres de combustion de moteurs à combustion interne

Also Published As

Publication number Publication date
CN101023262A (zh) 2007-08-22
EP1792073A1 (fr) 2007-06-06
DE102004044461A1 (de) 2006-03-30

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