EP0388494A1 - Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique - Google Patents

Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique Download PDF

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Publication number
EP0388494A1
EP0388494A1 EP19890105171 EP89105171A EP0388494A1 EP 0388494 A1 EP0388494 A1 EP 0388494A1 EP 19890105171 EP19890105171 EP 19890105171 EP 89105171 A EP89105171 A EP 89105171A EP 0388494 A1 EP0388494 A1 EP 0388494A1
Authority
EP
European Patent Office
Prior art keywords
fact
injector according
axial bore
injector
abutment shoulder
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.)
Withdrawn
Application number
EP19890105171
Other languages
German (de)
English (en)
Inventor
Mauro Forapianti
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP19890105171 priority Critical patent/EP0388494A1/fr
Publication of EP0388494A1 publication Critical patent/EP0388494A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto

Definitions

  • the invention relates to an electromagnetically operated injec­tor for use in electronically controlled fuel injection systems of the type described in the pre-characterising portion of claim 1.
  • the calibration of the dynamic flow of such a fuel injector is performed by adjusting a spring force by positioning a spring adjusting means.
  • the spring adjusting means is a bush, which is contained inside the central magnetic core. After the axial position adjustment it is fixed through mechanical deforming of the bush containing wall.
  • the spring must be loaded with some external device. Before moving the injector to the calibration stands this external device used during the run-in has to be disassembled. Subsequently the valving elements are no longer forced into a stable position by any spring load and the vibrations of the transport system could change the fuel feeding performance obtained during the run-in cycle.
  • the injector should also be protected against inaccurate handling.
  • Another object is to provide a pre-calibration run-in without any external device which requires less labor and thus reduces cost.
  • the invention is based on the idea to establish a minimum pre­load on the spring already present after the assembly of the injector before calibration.
  • the injector can be operated during the pre-calibration run-in without an external preload device.
  • the injector is protected against adverse consequences caused by rough handling or trans­portation because all the movable parts are in a stable posi­tion. Moreover, after assembly, the bush can't fall out of the injector and get damaged or lost.
  • the preload on the spring is created by an abutment shoulder, which is provided inside the axial bore of the magnetic core whereon the adjusting bush reacts.
  • the preload on the spring is much smaller than the load that will be established on the spring during the calibration pro­cedure. Therefore the calibration procedure can be effected without modification, because the abutment shoulder only pre­vents a reduction of the load but does not prevent an increase.
  • an electromagnetic fuel injector in accordance with this invention, includes an external body 1 formed from magnetizable material which houses an electric coil 2, wound on a spool 3, which surrounds a cylindrical magnetic core 4, also formed from magnetizable material.
  • the magnetic core 4 has a central bore 9 and is mounted on a bushing 5, made of non-magnetizable material, which acts as the longitudinal guide to a mobile armature 6 which, together with the body 1 and the core 4, forms the magnetic circuit.
  • the mobile armature 6 carries a plastic-made seating insert 7 which cooperates with the upper surface of a nozzle body 8 so to create a valving means for the fuel flowing through the axial bore 9 and cross-holes 10 in the central core 4.
  • the valving means is kept closed by the force on the armature 6 from a spring 11 housed in the central core 4 and reacting on an adjusting bush 12.
  • FIG 2 shows the position of the bush 12 before calibration in a larger scale.
  • the spring force is adjusted by axially positioning of the spring adjusting bush 12 to a position as shown in FIG 1.
  • a bore hole 16 is provided through which the wall of the magnetic core 4 can be deformed.
  • FIG 3 shows a second embodiment which allows the assembly of the adjusting bush 12 through the inlet chamber 20 of the injector.
  • Bore holes 21 are provided on two sides of the magnetic core 4 through which the wall of the axial bore 9 can be deformed. The resulting deformation on the inside of the axial bore 9 creates an abutment shoulder 18′.
  • an abutment shoulder 18 ⁇ is created by de­forming the rim of the wall of the cylindrical magnetic core 4 through the inlet chamber 20.
  • the abutment shoulder can be obtained by plastic forming of a plurality of grooves 22 on the inside wall of the axial bore 9.
  • the abutment shoulder is established by a plurality of little rims created by these deformations.
  • an abutment shoulder 18′′′ is obtained by means of an elastic ring 23.
  • the ring 23 is fitted into a groove created on the inner wall of the axial bore 9.
  • the ring 23 has a notch so that it can be inserted into the cylindrical bore 9.
  • the ring 23 can be made of metal or plastic.
  • the ring 23 can also be made of rubber. Due to the flexibility of this material there is no need of a notch and therefore an O-ring type can be used.
  • FIG 6 and 7 Another embodiment is shown in FIG 6 and 7.
  • An abutment shoul­der 18 IV is obtained by an annular element 24 pressed into the axial bore 9.
  • annular element 24, 24′ it can be cons­tructed with (FIG 7) or without a notch (FIG 6).
  • the annular element 24, 24′ can be made of some metallic material or of plastic.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19890105171 1989-03-22 1989-03-22 Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique Withdrawn EP0388494A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19890105171 EP0388494A1 (fr) 1989-03-22 1989-03-22 Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19890105171 EP0388494A1 (fr) 1989-03-22 1989-03-22 Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique

Publications (1)

Publication Number Publication Date
EP0388494A1 true EP0388494A1 (fr) 1990-09-26

Family

ID=8201127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890105171 Withdrawn EP0388494A1 (fr) 1989-03-22 1989-03-22 Procédé pour ajuster la tension d'un élément elastique dans un injecteur électromagnétique

Country Status (1)

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EP (1) EP0388494A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480610A1 (fr) * 1990-10-09 1992-04-15 Ford Motor Company Limited Injecteur de carburant pour moteur à combustion interne
WO1994019600A1 (fr) * 1993-02-16 1994-09-01 Siemens Automotive Corporation Injecteur de carburant
EP0879952A2 (fr) * 1997-05-20 1998-11-25 Siemens Automotive Corporation Inhibiteur de migration de fluide pour injecteurs de combustible
EP0905371A2 (fr) * 1997-09-24 1999-03-31 MAGNETI MARELLI S.p.A. Injecteur électromagnétique
EP1083332A2 (fr) * 1999-09-08 2001-03-14 Assembly Technology & Test Limited Dispositif de mesure
CN1077956C (zh) * 1993-02-16 2002-01-16 西门子汽车公司 喷油器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2127146A5 (fr) * 1971-02-25 1972-10-13 Brev Etudes Sibe
FR2276472A1 (fr) * 1974-06-29 1976-01-23 Lucas Electrical Co Ltd Injecteur de combustible pour moteurs a combustion interne
EP0184124A1 (fr) * 1984-12-06 1986-06-11 VDO Adolf Schindling AG Injecteur de combustible à commande électromagnétique
EP0301381A1 (fr) * 1987-07-21 1989-02-01 Nippondenso Co., Ltd. Procédé pour l'ajustement de la quantité de combustible injectée par un injecteur électromagnétique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2127146A5 (fr) * 1971-02-25 1972-10-13 Brev Etudes Sibe
FR2276472A1 (fr) * 1974-06-29 1976-01-23 Lucas Electrical Co Ltd Injecteur de combustible pour moteurs a combustion interne
EP0184124A1 (fr) * 1984-12-06 1986-06-11 VDO Adolf Schindling AG Injecteur de combustible à commande électromagnétique
EP0301381A1 (fr) * 1987-07-21 1989-02-01 Nippondenso Co., Ltd. Procédé pour l'ajustement de la quantité de combustible injectée par un injecteur électromagnétique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480610A1 (fr) * 1990-10-09 1992-04-15 Ford Motor Company Limited Injecteur de carburant pour moteur à combustion interne
US5307991A (en) * 1990-10-09 1994-05-03 Ford Motor Company Fuel injector and method of manufacturing
WO1994019600A1 (fr) * 1993-02-16 1994-09-01 Siemens Automotive Corporation Injecteur de carburant
CN1077956C (zh) * 1993-02-16 2002-01-16 西门子汽车公司 喷油器
EP0879952A2 (fr) * 1997-05-20 1998-11-25 Siemens Automotive Corporation Inhibiteur de migration de fluide pour injecteurs de combustible
EP0879952A3 (fr) * 1997-05-20 1999-05-19 Siemens Automotive Corporation Inhibiteur de migration de fluide pour injecteurs de combustible
EP0905371A2 (fr) * 1997-09-24 1999-03-31 MAGNETI MARELLI S.p.A. Injecteur électromagnétique
EP0905371A3 (fr) * 1997-09-24 1999-12-22 MAGNETI MARELLI S.p.A. Injecteur électromagnétique
EP1083332A2 (fr) * 1999-09-08 2001-03-14 Assembly Technology & Test Limited Dispositif de mesure
EP1083332A3 (fr) * 1999-09-08 2003-05-21 Assembly Technology & Test Limited Dispositif de mesure

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