WO2001029401A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2001029401A1
WO2001029401A1 PCT/DE2000/003699 DE0003699W WO0129401A1 WO 2001029401 A1 WO2001029401 A1 WO 2001029401A1 DE 0003699 W DE0003699 W DE 0003699W WO 0129401 A1 WO0129401 A1 WO 0129401A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
valve
caulking
fuel injection
injection valve
Prior art date
Application number
PCT/DE2000/003699
Other languages
German (de)
English (en)
Inventor
Norbert Keim
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 EP00984843A priority Critical patent/EP1144847A1/fr
Priority to KR1020017007780A priority patent/KR20010093200A/ko
Priority to BR0007231-1A priority patent/BR0007231A/pt
Priority to JP2001531965A priority patent/JP2003512556A/ja
Publication of WO2001029401A1 publication Critical patent/WO2001029401A1/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
    • 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
    • F02M51/0607—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means the actuator being hollow, e.g. with needle passing through the hollow space

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • Changes in length of a piezoelectric actuator of a fuel injection valve are usually compensated for by temperature influences by means of hydraulic devices or by selection of suitable material combinations.
  • a fuel injection valve is known from EP 0 869 278 A1, in which the change in length of the actuator is compensated for by a corresponding material combination.
  • the fuel injection valve resulting from this document has an actuator which is arranged in an actuator space and which is positively connected to a pressure shoulder via which the actuator acts against the force of a compression spring on the valve needle.
  • the actuator is supported on the one hand on a pressure plate and on the other hand on an actuator. When the actuator is excited, the valve needle spray direction is actuated.
  • the compensation of the temperature-related change in length of the actuator is achieved in the above-mentioned document by means of several shims, which are located between the pressure plate and the end face of the actuator are arranged. These have a temperature expansion coefficient which corresponds to that of the actuator elements with the opposite sign. If the actuator is shortened due to rising temperatures, the shims expand and thereby compensate for the thermal change in length of the actuator.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage of a purely mechanical compensation of the temperature-related changes in length or position of the components. This ensures safe and precise operation of the fuel injector.
  • valve actuator can adapt to the temperature conditions unhindered.
  • the actuator is protected from external tensile and shear forces and gains greater stability.
  • the sealing of the actuator housing against the valve housing has the advantage that the actuators cannot be attacked by the chemically aggressive fuel.
  • the caulking actuators can be controlled in two stages or via two different circuits for the valve actuator and the caulking actuators, which opens up the possibility of pre-caulking.
  • Fig. 1 shows an axial section through an embodiment of a fuel injector according to the invention
  • Fig. 2 shows a section along the section line labeled II-II in Fig. 1.
  • Fig. 1 shows an axial sectional view of an embodiment of the invention
  • Fuel injection valve 1 This is a fuel injection valve 1 with a central fuel supply via a fuel inlet 2, which opens inwards.
  • a ring-shaped valve actuator 4 with a central recess 5, which consists of disk-shaped piezoelectric or agnetostrictive elements 6a, and a biasing spring 7 are arranged.
  • the valve actuator 4 is powered by an external voltage source actuated via a plug contact 8.
  • a plug contact 8 For simplification, only a single contact 40 is shown in FIG. 1, which is connected to the valve actuator 4 via an electrically conductive connection 9.
  • the plug contact 8 can be molded onto a plastic casing 41.
  • the actuator housing 3 partially includes an outer sleeve 43 and an inner sleeve 44. Between the valve actuator 4 and the outer sleeve 43, a protective and support sleeve 46 is provided, which comprises a first end plate 36, on which the valve actuator 4 with a first end face 32 supports. On the side opposite the end plate 36, a second end plate 37 is arranged, on which the biasing spring 7 is supported.
  • At least one caulking actuator 10 is arranged between the biasing spring 7 and the valve actuator 4.
  • three caulking actuators 10 are provided.
  • Each caulking actuator 10, like the valve actuator 4, consists of disk-shaped piezoelectric or magnetostrictive elements 6b and is e.g. B. as the valve actuator 4 in sandwich construction or solid.
  • a second circuit can be provided to actuate the caulking actuators 10.
  • the disk-shaped elements 6b of the caulking actuators 10 bear against a radially outer support plate 11, which is supported on the protective and support sleeve 46, and are each surrounded by a sleeve-shaped guide housing 13.
  • the direction of action of the caulking actuators 10 is perpendicular to the direction of action of the valve actuator 4.
  • the biasing spring 7 and the valve actuator 4 with a second end face 33 are supported on support segments 14.
  • a support segment 14 is arranged in the circumferential direction between the guide housings 13 and fulfills a support function for the valve actuator 4 and the biasing spring 7.
  • the support segments 14 and the caulking actuators 10 are not connected to the actuator housing 3, but are held in place in the actuator housing 3 by the pretensioning of the pretensioning spring 7.
  • An actuating body 15 is arranged in the central recess 5 of the valve actuator 4 and in the inner sleeve 44 and has a taper 16 in the region of the caulking actuators 10 and support segments 14. This taper 16 engages drivers 17 which are connected at the ends to the respective caulking 10. In the control breaks, the driver 17 rests on the actuating body 15 with a small residual force, as a result of which the caulking actuator 10 is still under tension.
  • the actuating body 15 is connected via an extension 18 to a valve needle 19 m, on which a valve closing body 20 is formed.
  • a valve closing body 20 When the valve closing body 20 is lifted off a valve seat surface 21 of a valve seat body 47, fuel is sprayed off through a spray opening 22.
  • the valve seat body 47 is connected to the outer sleeve 43 via a sleeve-shaped nozzle body 48.
  • the actuating body 15 is supported with its side facing away from the valve needle 19 on a return spring 23 and engages behind a flange 24 of the valve needle 19 with its extension 18.
  • a spring 25 is clamped between the flange 24 of the valve needle 19 and the actuating body 15.
  • the actuating body 15 can swing through during the closing movement relative to the valve needle 19, so that only the inert mass of the valve needle 19 strikes the valve seat surface 21. This prevents bouncers.
  • the fuel flows through an inner recess 26 of the actuating body 15, transverse bores 27 in the wall of the extension 18 and at least one channel 28 in the valve seat body 47 to the sealing seat.
  • a fuel injector 1 experiences large temperature fluctuations during operation. On the one hand, the entire fuel injection valve 1 heats up through contact with the combustion chamber of an internal combustion engine, and on the other hand, local temperature effects occur, for example. B. by the power loss when Verfor en of the piezoelectric valve actuator 4 or by electrical charge movement. This results in a thermal reduction in the length of the disk-shaped elements, since piezoelectric ceramics have negative coefficients of thermal expansion, that is to say they contract when heated and expand when cooled.
  • the arrangement according to the invention of the caulking actuators 10 perpendicular to the valve actuator 4 ensures that thermal length change processes, in particular of the valve actuator 4, can take place unimpeded in the control pauses without the valve actuator 4 being braced.
  • the residual force exerted on the actuating body 15 by the caulking actuators 10 is overcome by the biasing spring 7 or the valve actuator 4, while in the control phases the pressure of the driver 17 on the actuating body 15 is so strong that it is moved in the direction of expansion of the valve actuator 4.
  • FIG. 2 shows a schematic section through the fuel injection valve 1 along the section line designated II-II in FIG. 1. Elements already described are provided with the same reference numerals.
  • three identical caulking machines are 10 m apart at regular intervals of approx. 120 ° between the bias spring 7 and the valve actuator 4.
  • the caulking actuators 10 rest on support plates 11, which are supported on an inner wall 12 of the protective and support sleeve 46 of the valve actuator 4, and are surrounded by the transverse, sleeve-shaped guide housings 13.
  • the direction of action of the caulking actuators 10 is perpendicular to the direction of action of the valve actuator 4.
  • the biasing spring 7 and the valve actuator 4 are supported on the support segments 14. Between the guide housing 13 z. B. arranged at equal angular intervals of approximately 120 ° three support segments 14, which perform a support function for the valve actuator 4 and the biasing spring 7.
  • the support segments 14 and the caulking actuators 10 are not connected to the actuator housing 3, but are held in place in the actuator housing 3 by the pretensioning of the pretensioning spring 7.
  • the drivers 17 engage on the taper 16 of the actuating body 15 in such a way that the actuating body 15 is caulked with the valve actuator 4 between the three drivers 17.
  • the actuation voltages can be supplied simultaneously or at different times, so that the caulking actuators 10 can be pre-caulked before the valve actuator 4 is actuated.
  • the same effect can be achieved by selecting different piezoceramics for the valve actuator 4 and the caulking actuators 10 when actuated by the same circuit. If the piezoceramic of the caulking actuators 10 has a higher expansion coefficient than that of the valve actuator 4, a small actuation voltage is sufficient to actuate the caulking actuators 10 during the stroke transmitted by the valve actuator 4 to the valve needle 19 due to the smaller expansion of the piezoelectric elements 6a of the valve actuator 4 is not sufficient to open the fuel injector 1. If the voltage is then increased further, the fuel injection valve 1 is opened.
  • the invention is not limited to the exemplary embodiment shown, but can also be implemented with a large number of other designs of fuel injection valves 1.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant (1), en particulier une soupape d'injection pour installations d'injection de carburant de moteurs à combustion interne, qui comprend un actionneur de soupape (4) piézo-électrique ou magnétostrictif et un obturateur de soupape (20) pouvant être actionné par l'actionneur de soupape (4), au moyen d'un corps d'actionnement (15) et/ou d'un pointeau de soupape (19), cet obturateur de soupape (20) coopérant avec une surface de siège de soupape (21) pour créer une zone étanche. Le corps d'actionnement (15) ou le pointeau de soupape (19) peut être assemblé par liaison de force, par l'intermédiaire d'au moins un actionneur de matage (10).
PCT/DE2000/003699 1999-10-21 2000-10-21 Soupape d'injection de carburant WO2001029401A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP00984843A EP1144847A1 (fr) 1999-10-21 2000-10-21 Soupape d'injection de carburant
KR1020017007780A KR20010093200A (ko) 1999-10-21 2000-10-21 연료분사밸브
BR0007231-1A BR0007231A (pt) 1999-10-21 2000-10-21 Válvula de injeção de combustìvel
JP2001531965A JP2003512556A (ja) 1999-10-21 2000-10-21 燃料噴射弁

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19950762.7 1999-10-21
DE19950762A DE19950762A1 (de) 1999-10-21 1999-10-21 Brennstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2001029401A1 true WO2001029401A1 (fr) 2001-04-26

Family

ID=7926432

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003699 WO2001029401A1 (fr) 1999-10-21 2000-10-21 Soupape d'injection de carburant

Country Status (9)

Country Link
EP (1) EP1144847A1 (fr)
JP (1) JP2003512556A (fr)
KR (1) KR20010093200A (fr)
CN (1) CN1158457C (fr)
BR (1) BR0007231A (fr)
CZ (1) CZ20012267A3 (fr)
DE (1) DE19950762A1 (fr)
TW (1) TW548373B (fr)
WO (1) WO2001029401A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7635784B2 (en) 2007-06-15 2009-12-22 Hoffmann-La Roche Inc. Process for the preparation of 3-amino-pentan-1,5-diol

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20010280A1 (it) * 2001-05-08 2002-11-08 Magneti Marelli Spa Iniettore di carburante con attuatore piezoelettrico
DE10233906A1 (de) 2002-07-25 2004-02-19 Siemens Ag Einspritzmodul
DE502004006944D1 (de) * 2003-09-12 2008-06-05 Siemens Ag Dosiervorrichtung
DE102007023547B3 (de) * 2007-05-21 2008-06-26 Siemens Ag Verfahren und Vorrichtung zum Ermitteln einer Irreversibilität einer Längenänderung eines Piezokristalls
KR101314991B1 (ko) * 2012-01-25 2013-10-04 홍종한 차량용 피에조 인젝터

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050710A1 (fr) * 1980-10-23 1982-05-05 Robert Bosch Gmbh Installation d'injection de carburant
DE3237258C1 (de) * 1982-10-08 1983-12-22 Daimler-Benz Ag, 7000 Stuttgart Elektrisch vorgesteuerte Ventilanordnung
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
JPH109084A (ja) * 1996-06-24 1998-01-13 Nissan Motor Co Ltd 圧電式燃料噴射弁
EP0869278A1 (fr) 1997-04-04 1998-10-07 Siemens Aktiengesellschaft Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique
JPH10274127A (ja) * 1997-03-31 1998-10-13 Nippon Soken Inc 燃料噴射弁

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050710A1 (fr) * 1980-10-23 1982-05-05 Robert Bosch Gmbh Installation d'injection de carburant
DE3237258C1 (de) * 1982-10-08 1983-12-22 Daimler-Benz Ag, 7000 Stuttgart Elektrisch vorgesteuerte Ventilanordnung
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
JPH109084A (ja) * 1996-06-24 1998-01-13 Nissan Motor Co Ltd 圧電式燃料噴射弁
JPH10274127A (ja) * 1997-03-31 1998-10-13 Nippon Soken Inc 燃料噴射弁
EP0869278A1 (fr) 1997-04-04 1998-10-07 Siemens Aktiengesellschaft Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7635784B2 (en) 2007-06-15 2009-12-22 Hoffmann-La Roche Inc. Process for the preparation of 3-amino-pentan-1,5-diol

Also Published As

Publication number Publication date
EP1144847A1 (fr) 2001-10-17
DE19950762A1 (de) 2001-04-26
JP2003512556A (ja) 2003-04-02
CN1327506A (zh) 2001-12-19
KR20010093200A (ko) 2001-10-27
CN1158457C (zh) 2004-07-21
BR0007231A (pt) 2001-10-16
TW548373B (en) 2003-08-21
CZ20012267A3 (cs) 2002-06-12

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