EP0020888B1 - Kraftstoff-Einspritzdüse für Brennkraftmaschinen - Google Patents

Kraftstoff-Einspritzdüse für Brennkraftmaschinen Download PDF

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Publication number
EP0020888B1
EP0020888B1 EP80101801A EP80101801A EP0020888B1 EP 0020888 B1 EP0020888 B1 EP 0020888B1 EP 80101801 A EP80101801 A EP 80101801A EP 80101801 A EP80101801 A EP 80101801A EP 0020888 B1 EP0020888 B1 EP 0020888B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
injection nozzle
compression spring
fixed
sleeve
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
Application number
EP80101801A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0020888A1 (de
Inventor
Gerhard Stumpp
Ewald Dr.-Ing. Eblen
Karl Hofmann
Nestor Rodriguez Amaya
Josef Schlagenhauf
Odon Kopsé
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 EP0020888A1 publication Critical patent/EP0020888A1/de
Application granted granted Critical
Publication of EP0020888B1 publication Critical patent/EP0020888B1/de
Expired 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
  • the electrical switch is used for signaling a test device which determines the start of injection and, if appropriate, also the injection duration.
  • the resilient line element is formed by a flexible contact strip which is fastened both to the valve needle and to the connecting piece seated on the nozzle holder.
  • the line element with the valve needle and the connector must be installed together in the nozzle housing. In addition to the production of the two connection points of the contact strip, this requires very great care when assembling the injection nozzle.
  • valve needle forms an electrical switch with the valve seat (DE-A-2 748 447)
  • the valve needle is electrically contacted via the closing spring, the closing spring being surrounded by an insulating sleeve, which has otherwise the same dimensions the closing spring and the wall thickness of the nozzle holder undesirably increases its diameter.
  • the leakage oil in the spring chamber serves as an insulating agent between the closing spring and the wall of the nozzle holder.
  • injection nozzles with a built-in electrical switch for test purposes are known (US Pat. No. 3,942,366), in which the switch is arranged within the closing spring for the valve needle.
  • One contact member of the switch is formed by the pressure pin, via which the closing spring acts on the valve needle.
  • the other contact element of the switch is formed by a helical spring which sits at the free end of a contact pin which is fastened in an insulated manner in the nozzle holder and, when the valve needle is in the closed position, is axially opposite the pressure bolts with a small contact distance.
  • This design has the disadvantage that the valve needle only has to travel a short stroke before the switch responds and the signal is given, and that the adjustment and compliance with the contact distance pose certain difficulties.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the assembly of the injection nozzle is made considerably easier, in particular because the elastic spring element automatically comes into contact with the pressure pin and no special measures need to be taken for this.
  • the design of the spring element as a coil spring is also able to withstand higher vibrations than the known contact strip, the two connection points of which are at risk of breakage.
  • the arrangement according to the invention has the advantage that the diameter of the nozzle holder need not be increased and that nozzle holders of injection nozzles produced in series can therefore be used as an output part.
  • the arrangement according to the invention has the advantage that the signal is given exactly when the valve needle is lifted and struck from or on the valve seat.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the figure shows a longitudinal section through the fuel injector for a diesel engine.
  • the injection nozzle is essentially made of electrically conductive materials and is made up of a nozzle holder 10, an adjoining intermediate plate 11 and a nozzle body 12, which are screwed axially by means of a union nut 13.
  • a valve needle 15 has a needle shaft 18 which slides in a guide bore 14 of the nozzle body 12, a sealing cone 17 which interacts with a valve seat 16 of the nozzle body 12 and a pressure pin 19 which bears continuously on a pressure pin 20.
  • a spring chamber 21 open at the end with a shoulder 22 and a bore 23 are recessed, to which a recess 24 leading to the outside is continued.
  • a helical compression spring 25 is supported on the one hand Spring shim 26 on the shoulder 22 and on the other hand via an insulation to be described on the pressure pin 20.
  • the fuel passes through inlet channels 29 to 32 and ring channels 33, 34 into a pressure chamber 27 of the nozzle body 12, which has a connection to a spray opening 28 via the valve seat 16.
  • the injection nozzle has a line element 60 made of an electrically conductive material, which is designed as a helical spring with two axial ends 61, 62 and is freely movable within the compression spring 25.
  • the end 62 is non-positively supported in a trough 46 of the pressure pin 20, and the other end 61 is in a contact pin 64, which is stuck in the bore 23 by means of an insulating cap 65.
  • a connecting piece 66 is fastened via a sleeve 67 in the recess 24 of the nozzle holder 10 and is provided with a plug 68 which is insulated from the sleeve 67 and which ends in a contact tongue 69 which lies non-positively on a pin 70 of the contact pin 64 and with which an electrical connection is made manufactures.
  • a sleeve 71 made of hardened steel consisting of a ring 72 and a collar 73 is glued to the pressure pin 20 by means of an electrically insulating plastic layer 74 and forms a guide surface 48 and a bearing surface 49 for the compression spring 25.
  • a sleeve 75 made of hardened steel is made by means of an insulating layer 76 is glued to the needle shaft 18 of the valve needle 15 and slides in the guide bore 24 of the nozzle body 12.
  • the injector is screwed into its functional state in the engine block (not shown) and consequently has electrically conductive contact with the ground of the vehicle electrical system.
  • the electrical switch formed by the valve seat 16 and the sealing cone 17 is closed, whereby a circuit between the nozzle body 12 and the test device (not shown) is also closed.
  • the electrical switch 16/17 When the injection nozzle is in the open state, the electrical switch 16/17 is open, and since the valve needle 15, the pressure pin 20, the coil spring 60 and the connecting piece 66 are electrically insulated from the nozzle body 12 and the nozzle holder 10, there is also the electrical connection between the engine block and test device interrupted. When the valve needle 15 hits the valve seat 16 at the end of the injection process, the signal circuit leading through the test device is closed again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP80101801A 1979-06-22 1980-04-03 Kraftstoff-Einspritzdüse für Brennkraftmaschinen Expired EP0020888B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2925187 1979-06-22
DE2925187A DE2925187A1 (de) 1979-06-22 1979-06-22 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0020888A1 EP0020888A1 (de) 1981-01-07
EP0020888B1 true EP0020888B1 (de) 1983-10-12

Family

ID=6073858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101801A Expired EP0020888B1 (de) 1979-06-22 1980-04-03 Kraftstoff-Einspritzdüse für Brennkraftmaschinen

Country Status (4)

Country Link
US (1) US4340181A (enrdf_load_stackoverflow)
EP (1) EP0020888B1 (enrdf_load_stackoverflow)
JP (2) JPS566063A (enrdf_load_stackoverflow)
DE (2) DE2925187A1 (enrdf_load_stackoverflow)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3029721A1 (de) * 1980-08-06 1982-03-04 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzventil fuer brennkraftmaschinen
DE3117779A1 (de) * 1981-05-06 1982-11-25 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoff-einspritzduese fuer brennkraftmaschinen"
DE3125884A1 (de) * 1981-07-01 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
JPS5833773U (ja) * 1981-08-31 1983-03-04 トヨタ自動車株式会社 デイ−ゼル機関の燃料噴射時期測定装置
DE3229190A1 (de) * 1982-08-05 1984-02-09 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
US4625918A (en) * 1983-07-29 1986-12-02 Diesel Kiki Co., Ltd. Fuel injection valve
JPS60129483A (ja) * 1983-12-14 1985-07-10 Diesel Kiki Co Ltd 電磁弁
JPS60182351A (ja) * 1984-02-28 1985-09-17 Diesel Kiki Co Ltd スイツチ付弁装置
EP0387179A3 (en) * 1989-03-07 1991-01-02 Karl Holm An atomizing nozzle device and an inhaler
WO1992005363A1 (en) * 1990-09-18 1992-04-02 Lucas Industries Public Limited Company Fuel injection nozzles
DE19523243B4 (de) * 1995-06-27 2009-04-02 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen mit einer Spannmutter mit konisch ausgebildeter Ringschulter
DE19652719A1 (de) * 1996-12-18 1998-06-25 Daimler Benz Ag Vorrichtung zur Bestimmung der Öffnungs- und Schließzeitpunkte eines Ventils
BR0017320B1 (pt) * 2000-08-21 2009-01-13 dispositivo de sensoriamento de posiÇço de agulha.
DE10333358B3 (de) * 2003-07-23 2005-05-25 Siemens Ag Schaltungsanordnung und Verfahren zum Betreiben einer Injektoranordnung sowie Injektor
WO2005080786A1 (de) * 2004-02-11 2005-09-01 Siemens Aktiengesellschaft Kontaktierung der ventilnadel eines injektors für verbrennungsmotoren
DE102004015745A1 (de) * 2004-03-31 2005-10-13 Robert Bosch Gmbh Einrichtung zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einem Nadelhubsensor
US7497203B2 (en) * 2005-08-03 2009-03-03 Caterpillar Inc. Avoidance of spark damage on valve members
GB2547684A (en) * 2016-02-26 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector for a combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU182356A1 (ru) * 1964-06-11 1966-07-13 М. Г. Сандомирский Способ определения начала открытия клапана
US3361353A (en) * 1965-10-20 1968-01-02 Mitchell W. Millman Method and apparatus for injection of liquid fuels
DE2305114A1 (de) * 1973-02-02 1974-08-08 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
US4066059A (en) * 1976-01-02 1978-01-03 Texaco Inc. Fuel injection nozzle valve and ignition system
US4111178A (en) * 1976-11-08 1978-09-05 General Motors Corporation Ignition system for use with fuel injected-spark ignited internal combustion engines
GB1586254A (en) * 1977-06-22 1981-03-18 Lucas Industries Ltd Fuel injection nozzle unit for supplying fuel to an internal combustion engine
US4231525A (en) * 1979-05-10 1980-11-04 General Motors Corporation Electromagnetic fuel injector with selectively hardened armature

Also Published As

Publication number Publication date
DE2925187A1 (de) 1981-01-08
EP0020888A1 (de) 1981-01-07
JPS566063A (en) 1981-01-22
DE3065240D1 (en) 1983-11-17
JPH02131073U (enrdf_load_stackoverflow) 1990-10-30
JPH037572Y2 (enrdf_load_stackoverflow) 1991-02-25
US4340181A (en) 1982-07-20

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