WO2003054378A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

Info

Publication number
WO2003054378A1
WO2003054378A1 PCT/DE2002/004314 DE0204314W WO03054378A1 WO 2003054378 A1 WO2003054378 A1 WO 2003054378A1 DE 0204314 W DE0204314 W DE 0204314W WO 03054378 A1 WO03054378 A1 WO 03054378A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
actuator
injection valve
valve according
compensation element
Prior art date
Application number
PCT/DE2002/004314
Other languages
German (de)
English (en)
Inventor
Klaus Joos
Jens Wolber
Thomas Frenz
Markus Amler
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 WO2003054378A1 publication Critical patent/WO2003054378A1/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
    • 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

Definitions

  • the invention relates to a fuel injector according to the type of the main claim.
  • a fuel injection valve for fuel injection systems of internal combustion engines is known from DE 198 49 203 203. It comprises a valve closing body, which cooperates with a valve seat body to form a sealing seat, and a piezoelectric actuator for actuating the valve closing body.
  • the piezoelectric actuator comprises piezo layers and one or more temperature compensation layers.
  • the temperature compensation layers have a temperature expansion coefficient, the sign of which is opposite to the temperature expansion coefficient of the piezo layers.
  • a fuel injection valve for fuel injection systems of internal combustion engines which has a first piezoelectric or magnetostrictive actuator, a valve closing body which can be actuated by the first actuator by means of a valve needle and which cooperates with a valve seat surface to form a sealing seat, and a second piezoelectric or has a magnetostrictive actuator which acts against the first actuator on the valve needle.
  • the actuators are arranged one behind the other in the longitudinal direction of the fuel injection valve and are connected to one another by a bearing element which is mounted in a stationary manner in the fuel injection valve.
  • a disadvantage of the fuel injector known from DE 198 49 203 A1 is that the temperature compensation takes place by means of special layers within the actuator, the material of these temperature compensation layers having an opposite temperature expansion. This leads to problems, particularly in the case of fast dynamic processes, since the different materials behave differently due to the different coefficients of thermal expansion. In addition, a special actuator with temperature compensation layers must be developed.
  • a disadvantage of the method known from DE 199 18 976 AI fuel injection valve is caused by the axially offset arrangement of the actuators great overall length, the 'also with a broadening of the fuel injection valve, which is caused by the bearing of the bearing plate is associated.
  • the he fuel injector according to the invention with the characterizing features of the main claim has the advantage that the compensation element has the same overall length as the actuator.
  • the nesting of the piezoelectric actuator and the compensation element allows an extremely compact design of the fuel injector to be realized.
  • the compensation element and the actuator consist of the same material, so that a complete compensation of a temperature-related expansion is possible with the same dynamic behavior.
  • the temperature compensation can be achieved in a simple manner by reversing the direction of expansion of the actuator and the compensation element, which cancel each other out.
  • a further advantage is that the actuator chamber can be sealed off from the valve interior by a simple sealing element without the actuator having to be encapsulated in a complex manner.
  • Fig. 1 is a schematic representation of an embodiment of a fuel injector designed according to the invention.
  • Fig. 2 is a schematic section along the section line designated II -II through the embodiment shown in Fig. 1 of a fuel injection valve according to the invention. Description of the embodiment
  • the fuel injection valve 1 shows a highly schematic sectional illustration of a longitudinal section through a fuel injection valve 1 designed according to the invention.
  • the fuel injection valve 1 is designed as a fuel injection valve 1 for mixture-compressing, spark-ignition internal combustion engines. It is particularly suitable for injecting fuel directly into the combustion chamber of the internal combustion engine.
  • the fuel injection valve 1 comprises a housing 2, in which a piezoelectric or magnetostrictive actuator 3 is arranged.
  • the piezoelectric actuator 3 can be constructed, for example, from a plurality of piezoelectric layers glued together.
  • the actuator 3 is supported with its inlet end 4 on an end plate 5.
  • a biasing spring 6 is arranged between the end plate 5 and the housing 2.
  • the actuator 3 is supported with an outflow end 7 on a stem-shaped inlet end 8 'of a valve needle 9.
  • the valve needle 9 has at its downstream end 10 a valve closing body 11 which forms a sealing seat with a valve seat surface 12 formed on the housing 2 of the fuel injection valve 1.
  • the fuel injection valve 1 opens outward.
  • valve needle 9 is biased by a return spring 13 clamped between the housing 2 and the stem-shaped, inlet end 8 of the valve needle 9 so that the valve closing body 11 is held in sealing contact with the valve seat surface 12.
  • the fuel injection valve 1 has a compensation element 14 which is tubular. In a central recess 15 of the Compensation element 14, the piezoelectric actuator 3 is arranged.
  • the compensation element 14 has the same overall length as the actuator 3.
  • Compensation element 14 is also supported on the end plate 5 with an inlet end 16.
  • An outflow end 17 of the compensation element 14 rests on a shoulder 18, which is either integral with the
  • Housing 2 is formed or connected to it in a suitable manner, for example by welding or soldering.
  • a sealing element 19 is formed, which seals an actuator space 20 on the inlet side of the sealing element 19 against a valve interior 21 on the outlet side of the sealing element 19.
  • the actuator 3 expands in an outflow direction against the force of the return spring 13.
  • the stem-shaped end 8 of the valve needle 9 is also moved in the outflow direction with the valve needle 9 which is operatively connected to it.
  • the valve closing body 11 connected to the valve needle 9 lifts off the valve seat surface 12, as a result of which the fuel injection valve 1 is opened and fuel is sprayed into the combustion chamber.
  • a compensation element 14 according to the invention is provided.
  • the compensation element 14, downstream with seinem- end 17 is fixed to the housing, the compensation element 14 can only expand counter to the outflow direction, so the direction of the temperature-related expansion of the compensation element 14 is opposite to the temperature-related change in length of the actuator 3.
  • the compensation element 14 presses the end plate 5 against the force of the biasing spring 6 against the outflow direction when heated.
  • the compensating element 14 and the actuator 3 are preferably made of the same material, their Temperaturausdehnungs- 'coefficient is equal, so that a temperature-induced change in length of actuator 3, which would without compensation result in an undesired opening of the fuel injector 1, is compensated. Due to the same material, rapid temperature changes, for example when starting the internal combustion engine, can be intercepted without malfunction of the fuel injector 1.
  • the identical overall length of the actuator 3 and the compensation element 14 ensures a very precisely adjustable compensation of the temperature-related change in length.
  • the invention is not limited to the illustrated embodiment and, for example, for agnetostriktive actuators 3, for other forms of 'compensation elements 14 as well as for arbitrary designs of fuel injectors 1 applicable.

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 une soupape d'injection de carburant (1) servant à l'injection directe de carburant dans la chambre de combustion d'un moteur à combustion interne. Cette soupape d'injection comprend un actionneur piézoélectrique ou magnétostrictif (3), un corps de fermeture (11) de soupape pouvant être actionné par cet actionneur (3) au moyen d'un pointeau (9) de soupape, lequel corps de fermeture coopère avec une surface de siège (12) de soupape de manière à former un siège d'étanchéité, et un élément de compensation (14). Ledit actionneur (3) et cet élément de compensation (14) présentent la même longueur totale et le même comportement de dilatation thermique, cet actionneur (3) traversant l'élément de compensation (14) sur toute sa longueur à travers un évidement (15) formé dans ledit élément de compensation (14).
PCT/DE2002/004314 2001-12-05 2002-11-25 Soupape d'injection de carburant WO2003054378A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10159748.7 2001-12-05
DE10159748.7A DE10159748B4 (de) 2001-12-05 2001-12-05 Brennstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2003054378A1 true WO2003054378A1 (fr) 2003-07-03

Family

ID=7708136

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/004314 WO2003054378A1 (fr) 2001-12-05 2002-11-25 Soupape d'injection de carburant

Country Status (2)

Country Link
DE (1) DE10159748B4 (fr)
WO (1) WO2003054378A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005119049A1 (fr) * 2004-06-03 2005-12-15 Siemens Aktiengesellschaft Soupape d'injection
WO2008128824A1 (fr) * 2007-04-19 2008-10-30 Continental Automotive Gmbh Unité d'actionnement pour une soupape d'injection et soupape d'injection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10233906A1 (de) 2002-07-25 2004-02-19 Siemens Ag Einspritzmodul
KR100849155B1 (ko) 2003-11-20 2008-07-30 바이킹 테크놀러지스, 엘.씨. 전기-기계식 액추에이터를 위한 통합적 열 보상 장치 및방법
DE102004001679B4 (de) * 2004-01-12 2009-01-08 Continental Automotive Gmbh Piezoaktor mit Mitteln zur Kompensation der thermischen Längenänderung und Kraftstoff-Einspritzventil mit Piezoaktor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037078A1 (de) * 1980-10-01 1982-04-22 Daimler-Benz Ag, 7000 Stuttgart Elektrisch angesteuertes stellglied
JPH06344273A (ja) * 1993-06-07 1994-12-20 Maeda Kinzoku Kogyo Kk ボルト・ナット締付具
DE19849203A1 (de) 1998-10-26 2000-04-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19918976A1 (de) 1999-04-27 2000-11-02 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zu dessen Betätigung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538791C2 (de) * 1995-10-18 1998-04-09 Daimler Benz Ag Piezosteuerventil für Kraftstoffeinspritzanlagen von Brennkraftmaschinen
DE19702066C2 (de) * 1997-01-22 1998-10-29 Daimler Benz Ag Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen
DE19909106C2 (de) * 1999-03-02 2001-08-23 Siemens Ag Temperaturkompensierte piezoelektrische Aktoreinheit
DE19948359A1 (de) * 1999-10-07 2001-01-11 Siemens Ag Aktoreinheit mit Keramikelement zur Temperaturkompensation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037078A1 (de) * 1980-10-01 1982-04-22 Daimler-Benz Ag, 7000 Stuttgart Elektrisch angesteuertes stellglied
JPH06344273A (ja) * 1993-06-07 1994-12-20 Maeda Kinzoku Kogyo Kk ボルト・ナット締付具
DE19849203A1 (de) 1998-10-26 2000-04-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19918976A1 (de) 1999-04-27 2000-11-02 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zu dessen Betätigung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 03 28 April 1995 (1995-04-28) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005119049A1 (fr) * 2004-06-03 2005-12-15 Siemens Aktiengesellschaft Soupape d'injection
WO2008128824A1 (fr) * 2007-04-19 2008-10-30 Continental Automotive Gmbh Unité d'actionnement pour une soupape d'injection et soupape d'injection

Also Published As

Publication number Publication date
DE10159748B4 (de) 2014-11-13
DE10159748A1 (de) 2003-06-26

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