EP0099991B1 - Kraftstoff-Einspritzdüse für Brennkraftmaschinen - Google Patents

Kraftstoff-Einspritzdüse für Brennkraftmaschinen Download PDF

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Publication number
EP0099991B1
EP0099991B1 EP83106279A EP83106279A EP0099991B1 EP 0099991 B1 EP0099991 B1 EP 0099991B1 EP 83106279 A EP83106279 A EP 83106279A EP 83106279 A EP83106279 A EP 83106279A EP 0099991 B1 EP0099991 B1 EP 0099991B1
Authority
EP
European Patent Office
Prior art keywords
coil
coil core
armature
bore
injection nozzle
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
EP83106279A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0099991A1 (de
Inventor
Bernhard Kaczynski
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 EP0099991A1 publication Critical patent/EP0099991A1/de
Application granted granted Critical
Publication of EP0099991B1 publication Critical patent/EP0099991B1/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 is based on a fuel injection nozzle for internal combustion engines according to the preamble of claim 1.
  • These injection nozzles are characterized in that only one induction coil is required for the signal and that relatively large percentage changes in the air gap or the pole faces delimiting the air gap can be achieved so that only a relatively small amount of effort is required for signal amplification in the measuring circuit.
  • a converter which consists of a stationary part which generates a magnetic field and a second part which is moved by the valve needle.
  • the magnetic field-producing part of the transducer is designed as a screw which is screwed into a threaded bore extending from the rear end of the nozzle holder and can be adjusted as a whole in the threaded bore for the purpose of axial adjustment relative to the second part of the transducer.
  • This version requires a special design of the nozzle holder, in which the fuel supply line is not inserted centrally into the nozzle holder, as is usual, but laterally.
  • the arrangement according to the invention with the characterizing features of claim 1 has the advantage that the coil core for adjusting the initial air gap or the initial size of the opposing pole faces on the coil core and armature can still be adjusted axially even after the injection nozzle has been assembled, without that for the Nozzle holder must be provided for a special design that deviates from the usual design with a central introduction of the fuel supply line.
  • the initial air gap or the initial size of the pole faces can be determined, for example, by electronic measurement of the initial inductance of the induction coil, or mechanically by the distance between the relevant surfaces on the armature and the coil core relative to a reference plane, for example the separation plane between the nozzle holder, before the injection nozzle is assembled and between the disc or nozzle body.
  • the adjusting element which determines the axial position of the coil core can be readjusted in accordance with the actually desired initial value of the air gap or pole face size and then the coil core can be fixed in the set position, e.g. B. be clamped by caulking.
  • the bore for receiving the adjusting member opens at an acute angle into the bore receiving the coil core or the bobbin.
  • the adjusting element can be a bolt which is inserted into the bore permanently or only temporarily during adjustment.
  • the coil core be displaceably guided in an extension of the coil body and provided on the side facing away from the armature with a pin which fits into a narrowed bore section in the nozzle holder.
  • the armature influenced by the valve needle or a rod part connecting the armature to the valve needle can be made particularly short if the coil core passes axially through the induction coil and is displaceably guided therein.
  • the arrangement can also be such that both the coil core and the armature are immersed in the induction coil and the magnetic air gap is arranged between these parts within the induction coil.
  • the bores in the nozzle holder which serve to receive the induction coil and the coil core can be sealed in a simple manner against leakage oil leakage in that the coil body and / or the coil core carries a sealing ring on the outer circumference.
  • FIG. 1 shows the first exemplary embodiment partly in longitudinal section and partly in side view
  • FIG. 2 shows a partial longitudinal section through the second exemplary embodiment that is enlarged compared to FIG.
  • the injection nozzle according to FIG. 1 has a nozzle holder 10, against which an intermediate plate 11 and a nozzle body 12 are clamped by a union nut 13.
  • a valve needle 14 is displaceably mounted in the nozzle body 12, on which a closing spring 16 acts via a pressure piece 15 and is accommodated in a spring chamber 17 of the nozzle holder 10.
  • the valve needle 14 cooperates with an inward-facing valve seat in the nozzle body 12 and executes its opening stroke against the direction of flow of the fuel.
  • the guide bore of the valve needle 14 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 14 has a pressure shoulder facing the valve seat and which has channels 18, 19, 20 and 21 in the intermediate disk 11 or the nozzle holder 10 Fuel connection nozzle 22 of the nozzle holder 10 is connected.
  • the fuel pressure acting on the pressure shoulder of the valve needle 14 pushes the valve needle 14 upward against the force of the closing spring 16 until an invisible shoulder on the valve needle 14 abuts against the lower end face of the intermediate disk 11 and limits the further upward stroke of the valve needle 14.
  • the closing spring 16 is supported by a washer 24 on a flange part 25 made of magnetically conductive material, which abuts a shoulder 26 of the nozzle housing 10, which is formed at the transition from the spring chamber 17 to a multi-step blind bore 28.
  • An induction coil designated as a whole with the reference number 30 is inserted into the latter, the winding 31 of which is applied to a coil body 32.
  • Flange part 25 and coil body 32 are firmly connected to one another by means of a suitable method (glued, overmoulded).
  • an anchor bolt 34 made of magnetically conductive material is slidably guided, which is firmly connected to the pressure piece 15 via an extension 35 and thereby moves with the valve needle 14 in both directions.
  • the extension 35 is advantageously designed as a plastic part which is firmly connected to the anchor bolt 34 and the pressure piece 15 by a suitable method. This design of the extension 35 ensures that the anchor bolt 34 can move without jamming in the flange part 25 and the coil body 32.
  • the coil former 32 is provided on the end face facing away from the flange part 25 with a hub-shaped extension 38, in which a coil core 40, which cooperates with the anchor bolt 34 and is made of magnetically conductive material, is slidably mounted.
  • This has a blind bore 41 in its front end facing the anchor bolt 34, the diameter of which is larger than the diameter of the anchor bolt 34 by twice the residual air gap between the anchor bolt 34 and the coil former 40.
  • the coil core 40 is provided with a pin 42, which fits into the stepped inner section 43 of the blind bore 28 with a metallic contact.
  • the end face of the pin 42 rests on the front end of a stud screw 44 which is screwed into a threaded bore 45 which extends at an acute angle a to the longitudinal axis of the injection nozzle.
  • a lateral recess 48 is provided in the nozzle holder 10, which cuts the bore 28 in the region of its central section 49 receiving the attachment 38.
  • Means 50 are provided in the recess 48 for sealingly leading out the winding ends of the induction coil 30 and connecting them to a further cable 51, via which an evaluation circuit can be connected to the injection nozzle.
  • a sealing ring 52 is also provided on the circumference of the coil former 32 and a sealing ring 53 on the circumference of the coil core 40.
  • a longitudinal bore 54 and a transverse bore 55 are provided in the anchor bolt 34 to relieve the pressure in the blind bore 41 against the spring chamber 17.
  • the magnetic field of the induction coil 30 leads via the armature bolt 34, the flange part 25, the inner region of the nozzle holder 10, the coil core 40 and the air gap which is formed between the coil core 40 and the armature bolt 34.
  • the arrangement is such that even when the valve is closed, the anchor bolt 34 dips a very small amount into the blind bore 41.
  • the smallest air gap between the armature bolt 34 and the coil core 40, which results from the radial play between these parts, is already present in the starting position.
  • the signal-generating change in the magnetic field resistance is caused by the fact that during the opening stroke of the valve needle 14 the anchor bolt 34 dips deeper into the blind bore 41 and the pole faces of the parts delimiting the air gap thereby increase.
  • the initial size of the pole faces when the valve is closed can be set to any desired value by means of the stud screw 44.
  • the value set in each case can be determined, for example, by detecting the inductance of the coil by means of an electronic circuit. However, adjustment by purely mechanical measurement is also possible.
  • the distance of the free end face of the anchor bolt 34 from the upper end face of the washer 11, such as the distance of the free end face of the coil core 40 from the lower end face of the nozzle holder 10 is determined. The desired difference between the two distances can then be easily adjusted by appropriately turning the stud screw 44.
  • the coil core 40 is fixed at a point 58 in the nozzle holder 10 by caulking by means of a tool inserted into the recess 48.
  • the arrangement according to the invention is not restricted to the construction shown and described.
  • the air gap could, for example, also be formed between plane pole faces oriented perpendicular to the longitudinal axis of the injection nozzle, the signal being generated solely by changing the length of the air gap.
  • An arrangement is particularly advantageous in which, when the valve needle 14 is in the closed position, the anchor bolt 34 is not yet immersed in the blind bore 41, because particularly large changes in the magnetic resistance can be achieved via the valve needle stroke.
  • the adjustability of the coil core according to the invention is also not limited to the fact that the coil core is arranged on the side of the winding of the induction coil remote from the valve needle 14 and the armature bolt passes through the coil body.
  • the arrangement is such that a coil core 60 is passed through the winding 61 of an induction coil, designated as a whole by the reference number 62, and has a thickened end face 63 protruding from the winding 61, in which the end cooperating with the armature bolt 34 Blind bore 41 is arranged.
  • the anchor bolt 34 is here much shorter than in the embodiment according to FIG. 1 and, moreover, tapered at its free end, so that both air gap reductions and increases in the pole area result in the valve needle lifts.
  • a flange part 65 consisting of magnetically conductive material is also provided here, which abuts the end face 63 of the coil core 60 via a magnetically insulating molded part 66 and connects it with this z. B. is connected by adhesive.
  • the molded part 66 is also used to guide the anchor bolt 34.
  • a sealing ring 67 is stretched between the nozzle holder and the front end 63 of the coil core 60.
  • the coil core 60 is fixed in the nozzle holder by caulking.
  • the blind bore 41 could also be formed in the armature bolt 34 instead of in the coil core 60, which would be provided with a thickened head part for this purpose.
  • both the coil core and the anchor bolt are immersed in the induction coil, the magnetic air gap being formed within the induction coil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP83106279A 1982-07-27 1983-06-28 Kraftstoff-Einspritzdüse für Brennkraftmaschinen Expired EP0099991B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3227989 1982-07-27
DE19823227989 DE3227989A1 (de) 1982-07-27 1982-07-27 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0099991A1 EP0099991A1 (de) 1984-02-08
EP0099991B1 true EP0099991B1 (de) 1987-03-04

Family

ID=6169430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106279A Expired EP0099991B1 (de) 1982-07-27 1983-06-28 Kraftstoff-Einspritzdüse für Brennkraftmaschinen

Country Status (4)

Country Link
US (1) US4502326A (enrdf_load_stackoverflow)
EP (1) EP0099991B1 (enrdf_load_stackoverflow)
JP (1) JPS5934476A (enrdf_load_stackoverflow)
DE (2) DE3227989A1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3343269C1 (de) * 1983-11-30 1985-04-04 Daimler-Benz Ag, 7000 Stuttgart Vorrichtung zum indirekten beruehrungslosen elektrischen Messen kleiner Wege
US4573349A (en) * 1984-06-28 1986-03-04 International Harvester Company Needle position indicator for a fuel injection nozzle holder
DE3515264A1 (de) * 1985-04-27 1986-11-27 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
GB8516127D0 (en) * 1985-06-26 1985-07-31 Lucas Ind Plc Fuel injection nozzle
EP0301381B1 (en) * 1987-07-21 1991-09-11 Nippondenso Co., Ltd. Method for adjusting fuel injection quantity of electromagnetic fuel injector
DE3736198A1 (de) * 1987-10-26 1989-05-18 Voest Alpine Automotive Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3840339A1 (de) * 1988-11-30 1990-05-31 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE4108416C2 (de) * 1991-03-15 2000-05-18 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
DE4341102A1 (de) * 1993-12-02 1995-06-08 Bosch Gmbh Robert Kraftstoffeinspritzdüse mit Nadelstellungsfühler
US5895844A (en) * 1997-05-29 1999-04-20 Outboard Marine Corporation Precise fuel flow measurement with modified fluid control valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2136705A5 (enrdf_load_stackoverflow) * 1971-04-27 1972-12-22 Maschf Augsburg Nuernberg Ag

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2365592A (en) * 1940-05-30 1944-12-19 Kapella Ltd Electrical measuring apparatus
GB729431A (en) * 1951-09-25 1955-05-04 Leslie Hartridge Apparatus and devices for testing fuel injection pumps and nozzles for internal combustion compression ignition engines
GB754917A (en) * 1953-11-04 1956-08-15 Daimler Benz Ag Apparatus for measuring the movement of valve needles, particularly for fuel injection nozzles of internal combustion engines
GB1549768A (en) * 1975-08-02 1979-08-08 Lucas Industries Ltd Movement transducers
DE3004424A1 (de) * 1980-02-07 1981-08-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduesenhalter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2136705A5 (enrdf_load_stackoverflow) * 1971-04-27 1972-12-22 Maschf Augsburg Nuernberg Ag

Also Published As

Publication number Publication date
US4502326A (en) 1985-03-05
JPH0425433B2 (enrdf_load_stackoverflow) 1992-04-30
DE3370055D1 (en) 1987-04-09
DE3227989A1 (de) 1984-02-02
JPS5934476A (ja) 1984-02-24
EP0099991A1 (de) 1984-02-08

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