EP1144846B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1144846B1
EP1144846B1 EP00979439A EP00979439A EP1144846B1 EP 1144846 B1 EP1144846 B1 EP 1144846B1 EP 00979439 A EP00979439 A EP 00979439A EP 00979439 A EP00979439 A EP 00979439A EP 1144846 B1 EP1144846 B1 EP 1144846B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
piezoelectric actuator
nozzle needle
injection nozzle
piston
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.)
Expired - Lifetime
Application number
EP00979439A
Other languages
German (de)
English (en)
Other versions
EP1144846A1 (fr
Inventor
Katsuoki Itoh
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 EP1144846A1 publication Critical patent/EP1144846A1/fr
Application granted granted Critical
Publication of EP1144846B1 publication Critical patent/EP1144846B1/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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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

Definitions

  • the invention relates to a fuel injection nozzle having a nozzle body, a nozzle needle which is displaceable in the nozzle body, a piezoelectric actuator which is connected to the nozzle needle, and a compensating piston, on which the piezoactuator is supported and which is in a compensation chamber protrudes, which is filled with a fluid, wherein the compensation chamber communicates exclusively with a supply volume through an inlet with a small cross-section and wherein between the nozzle body and the compensating piston, a spring is provided which acts on the compensating piston against the piezo-actuator.
  • Such an injection nozzle is out of the DE 35 33 085 A1 known.
  • the compensating piston makes it possible to compensate for a change in length of the piezoactuator occurring at low speed. Such a change in length is particularly caused by a change in temperature. When such a change occurs, the fluid is displaced from or sucked into the compensation chamber by the balance piston.
  • a rapid change in length of the piezoelectric actuator occurs, as it is caused to open the nozzle needle, a displacement of the fluid present in the compensation chamber such high resistance due to the small cross-section of the inlet is opposed, that the balance piston acts as a rigid abutment. The nozzle needle can then be actuated without the balance piston influencing the opening stroke caused.
  • a fuel injection nozzle in which the compensation chamber is connected via an inlet throttle to the high-pressure side and via a vent hole to the leakage side.
  • the object of the invention is to provide a fuel injector which manages without the return spring to be overcome by the piezoelectric actuator.
  • a fuel injector of the type mentioned which has the features of claim 1, has the advantage that the pressure prevailing in the supply pressure, which also acts on the balance piston, comparable to a return spring for the nozzle needle acts, so that a separate, strong prestressed return spring can be dispensed with.
  • the injection nozzle has a nozzle body 10, in which an inner opening nozzle needle 12 is slidably disposed.
  • the nozzle needle 12 may open injection holes 14 formed in the nozzle body 10 to allow for the injection of fuel via a supply bore 16 and a Ring channel 18 is provided.
  • the supply bore 16 is supplied by a high-pressure manifold, which is known as "common rail".
  • the nozzle needle 12 is connected at its end remote from the spray holes 14 end with a piezoelectric actuator 20, which consists of a stack of piezo-elements 22 and a holder 24.
  • the piezo elements are biased in the holder 24 by an annular spring 26.
  • the piezoelectric actuator 20 is further provided with supply terminals (not shown) by means of which a voltage can be applied to the piezoelectric elements 22.
  • a ball 28 is arranged, against which a compensating piston 30 is applied.
  • the ball 28 ensures that any tolerances and positional deviations between the balance piston 30 and the piezo actuator 20 in the radial direction are not transmitted from one part to the other.
  • the piston 30 protrudes into a compensation chamber 32, which is connected via an annular gap with the thickness d between the wall of the compensation chamber 32 and the balance piston 30 with a supply volume 34.
  • the supply volume is below the system pressure P SYS , which is usually equal to the pressure of the provided fuel.
  • a compression spring 36 is arranged, which acts on the balance piston 30 against the piezoelectric actuator 20.
  • the compression spring 36 thus acts on the balance piston 30 in the sense of an increase in the volume of the compensation chamber 32nd
  • the described fuel injector operates in the following manner: When the injector associated injection system is turned off, the compression spring 36 ensures that the nozzle needle 12 is pressed via the piezoelectric actuator 20 in abutment against the nozzle body 10, so that the injection holes 14 closed and no fuel from the injector can enter the combustion chamber of an internal combustion engine to be supplied. In contrast, when the injection system is turned on and provided via the supply bore 16 fuel is under system pressure, an opening force is generated at the disposed in the annular chamber 18 annular shoulder of the nozzle needle 12. This acts on the nozzle needle 12 with respect to the figure upwards. The piezoelectric actuator 20 and the compensating piston 30 counteract the opening force.
  • a voltage is applied to the piezoelectric elements 22 in the compensating state, so that the individual piezoelectric elements extend axially.
  • the rear end of the piezo-actuator 20 is supported via the balance piston 30 against the fluid, which is in the balance chamber 32 under system pressure.
  • the voltage applied to the piezo elements 22 is interrupted. Then, the piezoelectric elements pull together axially, so that the nozzle needle 12 can perform an opening stroke of up to 0.25 mm.
  • the balance piston 30 remains in its position, since the fluid present in the compensation chamber 32 does not permit a movement of the compensation piston 30; the annular gap around the balance piston 30, through which the fluid could flow from the supply volume 34 is so small that the system for the short periods during which the nozzle needle is opened, can be assumed to be fixed.
  • the voltage is applied to the piezo-elements 22 again, so that they expand in the axial direction and move the nozzle needle 12 in its closed position.

Landscapes

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

Claims (3)

  1. Injecteur de carburant comportant un corps d'injecteur (10), une aiguille d'injecteur (12) coulissant dans le corps d'injecteur, un actionneur piézo-électrique (20) relié à l'aiguille d'injecteur (12) et un piston d'équilibrage (30) contre lequel s'appuie l'actionneur piézo-électrique (20) et qui pénètre dans une chambre d'équilibrage (32) remplie d'un fluide, cette chambre (32) communiquant exclusivement avec un volume d'alimentation (34) par une arrivée de faible section et un ressort (36) qui sollicite le piston d'équilibrage (30) contre l'actionneur piézo-électrique (20) est prévu entre le corps d'injecteur (10) et le piston d'équilibrage (30),
    caractérisé en ce que
    l'aiguille d'injecteur (12) s'ouvre vers l'intérieur et elle est sollicitée vers sa position de fermeture par le ressort (36) et
    le volume d'alimentation (34) est à la pression de carburant à injecter.
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    le volume d'alimentation (34) est rempli de carburant.
  3. Injecteur selon l'une quelconque des revendications précédentes,
    caractérisé par
    une bille (28) entre le piston d'équilibrage (30) et l'actionneur piézo-électrique (20) compense les tolérances entre le piston d'équilibrage (30) et l'actionneur piézo-électrique (20).
EP00979439A 1999-11-08 2000-10-20 Injecteur de carburant Expired - Lifetime EP1144846B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19953562 1999-11-08
DE19953562A DE19953562A1 (de) 1999-11-08 1999-11-08 Kraftstoff-Einspritzdüse
PCT/DE2000/003694 WO2001034967A1 (fr) 1999-11-08 2000-10-20 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP1144846A1 EP1144846A1 (fr) 2001-10-17
EP1144846B1 true EP1144846B1 (fr) 2008-01-16

Family

ID=7928220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00979439A Expired - Lifetime EP1144846B1 (fr) 1999-11-08 2000-10-20 Injecteur de carburant

Country Status (7)

Country Link
US (1) US6758409B1 (fr)
EP (1) EP1144846B1 (fr)
JP (1) JP2003514189A (fr)
KR (1) KR100665935B1 (fr)
CZ (1) CZ295573B6 (fr)
DE (2) DE19953562A1 (fr)
WO (1) WO2001034967A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10147669A1 (de) * 2001-09-27 2003-04-10 Bosch Gmbh Robert Piezoaktor zur Betätigung eines mechanischen Bauteils
DE10158789A1 (de) 2001-11-30 2003-07-10 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004044153A1 (de) 2004-09-13 2006-03-30 Siemens Ag Hubvorrichtung und Einspritzventil
DE102005009147A1 (de) * 2005-03-01 2006-09-07 Robert Bosch Gmbh Kraftstoffinjektor für Verbrennungskraftmaschinen
US8113179B1 (en) 2010-08-10 2012-02-14 Great Plains Diesel Technologies, L.C. Programmable diesel fuel injector
US8683982B2 (en) 2010-08-10 2014-04-01 Great Plains Diesel Technologies, L.C. Programmable diesel fuel injector
US8418676B2 (en) 2010-08-10 2013-04-16 Great Plains Diesel Technologies, L.C. Programmable diesel fuel injector
EP2954569A4 (fr) 2013-02-06 2016-11-02 Great Plains Diesel Technologies L C Actionneur magnétostrictif
DE102014207587A1 (de) * 2014-04-22 2015-10-22 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen und ein Verfahren zum Betreiben desselben

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1910143A1 (de) 1969-02-28 1970-11-05 Kloeckner Humboldt Deutz Ag Elektrisch steuerbares Einspritzventil
US4463901A (en) * 1982-07-29 1984-08-07 Cummins Engine Company, Inc. Unit fuel injector having independently controlled timing and metering
DE3533085A1 (de) 1985-09-17 1987-03-26 Bosch Gmbh Robert Zumessventil zur dosierung von fluessigkeiten oder gasen
US4721247A (en) * 1986-09-19 1988-01-26 Cummins Engine Company, Inc. High pressure unit fuel injector
DE3936619A1 (de) * 1989-11-03 1991-05-08 Man Nutzfahrzeuge Ag Verfahren zum einspritzen eines brennstoffes in einen brennraum einer luftverdichtenden, selbstzuendenden brennkraftmaschine, sowie vorrichtungen zur durchfuehrung dieses verfahrens
US5094397A (en) * 1991-02-11 1992-03-10 Cummins Engine Company, Inc Unit fuel injector with injection chamber spill valve
DE4211651B4 (de) * 1992-04-07 2004-11-18 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung, insbesondere Pumpedüse für Brennkraftmaschinen
DE19531652A1 (de) * 1995-08-29 1997-05-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19534445C2 (de) 1995-09-16 1998-07-30 Man Nutzfahrzeuge Ag Einspritzventil für Brennkraftmaschinen
JPH10122090A (ja) * 1996-10-14 1998-05-12 Komatsu Ltd ディーゼルエンジンの燃料噴射装置
DE19817320C1 (de) * 1998-04-18 1999-11-11 Daimler Chrysler Ag Einspritzventil für Kraftstoffeinspritzsysteme
DE19837813A1 (de) * 1998-08-20 2000-02-24 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19844837B4 (de) 1998-09-30 2009-05-07 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
DE19953562A1 (de) 2001-05-23
EP1144846A1 (fr) 2001-10-17
KR20010093246A (ko) 2001-10-27
WO2001034967A1 (fr) 2001-05-17
US6758409B1 (en) 2004-07-06
KR100665935B1 (ko) 2007-01-09
CZ295573B6 (cs) 2005-08-17
CZ20012471A3 (cs) 2002-11-13
DE50014918D1 (de) 2008-03-06
JP2003514189A (ja) 2003-04-15

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