EP0427947B1 - Kraftstoffeinspritzdüse für Brennkraftmaschinen - Google Patents

Kraftstoffeinspritzdüse für Brennkraftmaschinen Download PDF

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Publication number
EP0427947B1
EP0427947B1 EP90118924A EP90118924A EP0427947B1 EP 0427947 B1 EP0427947 B1 EP 0427947B1 EP 90118924 A EP90118924 A EP 90118924A EP 90118924 A EP90118924 A EP 90118924A EP 0427947 B1 EP0427947 B1 EP 0427947B1
Authority
EP
European Patent Office
Prior art keywords
insulating part
shaped insulating
retention body
injection nozzle
contact
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 - Lifetime
Application number
EP90118924A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0427947A1 (de
Inventor
Kurt Seifert
Karl Dipl.-Ing. Hofmann
Alfred Dipl.-Ing. Knauer
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 EP0427947A1 publication Critical patent/EP0427947A1/de
Application granted granted Critical
Publication of EP0427947B1 publication Critical patent/EP0427947B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the further lines are designed as individual cables, onto which an insulating tube (bougie tube) is attached and whose end sections between the two insulating molded parts provided in the lateral recess of the holding body after soldering and Fastening of the outer molded insulating part is fixed by a mushroom-shaped plastic part, the thickened shaft of which must be pressed through a hole in the outer molded insulating part.
  • the inner molded molded part is designed as an aperture covering the transverse hole, which is only interrupted by slots for the passage of the contact lugs. This design requires a relatively complex handling when soldering and assembling the parts.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the soldered connections can be made easily and safely and can be insulated from the metallic walls of the holding body, and that without additional parts and operations, the strain relief of the soldered connections when fastening the outer molded insulating part on Holding body results, which also facilitates the final assembly of the parts.
  • FIG. 1 shows an enlarged longitudinal section through an injection nozzle for diesel engines
  • FIG. 2 a side view of the upper end region of the injection nozzle according to FIG. 1,
  • FIG. 3 on a further enlarged scale and also in section the solder connections and the parts of the injection nozzle according to FIG. 1 surrounding them their final assembly
  • FIG. 4 an individual part of the injection nozzle in the direction of part A in FIG. 1
  • FIG. 5 a side view of the individual part according to FIG. 4
  • FIG. 6 a further individual part in the direction of part B in FIG. 1
  • FIG. 7 a plan view of FIG the individual part of Figure 6.
  • the injection nozzle has a holding body 10, to which a nozzle body 14, which slidably supports a valve needle 12, is fastened together with an intermediate disk 16 by means of a union nut 18.
  • the Holding body 10 has a chamber 20 for receiving a closing spring 22 and contains an induction coil 24 of a needle movement sensor, which is influenced by a bolt 26 moved with the valve needle 12.
  • the basic structure and function of the injection nozzle including the needle motion sensor correspond to a commercially available design and are therefore not explained in more detail in the present context.
  • the induction coil 24 has two radially projecting contact lugs 30 which (FIG. 3) enter a lateral recess 34 in the jacket of the holding body 10. There, the contact lugs 30 are connected to further leads via solder connections 36, which are formed by individual wires 38 of a sheathed cable 40 which is oval in cross section.
  • the solder connections 36 are produced with the aid of so-called soldering sleeves 42, which consist of a plastic tube with a soldering ring embedded therein.
  • the two contact ends to be connected are inserted one above the other in the soldering sleeves 42, after which the soldering sleeves 42 are heated by a hot air blower until the embedded solder rings run and the plastic tubes shrink onto the contact ends.
  • an inner insulating molding 48 and an outer insulating molding 50 are provided, which are simultaneously provided with means for strain relief of the solder connections 36.
  • the inner molded insulating part 48 has two side walls 52 which are arranged in parallel spacing and which abut the mouth edge 54 of the transverse hole 32 and between them delimit a space 56 for accommodating the contact lugs 30 and soldering sleeves 42.
  • the side cheeks 52 are connected to one another via a back web 58, onto which an attachment 60 is formed, projecting upwards. This also has two side cheeks 62 and a rear wall 64, which form a channel encompassing the jacket cable 40 approximately on one side.
  • a strip-like projection 68 On the side surface facing inwards 66 of the rear wall 64 is formed a strip-like projection 68, which serves to relieve the strain on the solder connections 36.
  • a shoulder 70 is formed which, in cooperation with a counter shoulder 72 on the holding body 10, holds the insulating molded part 48 in the axial direction without play on the holding body 10.
  • the outer molded insulating part 50 has an approximately segment-shaped cross-sectional profile and fills the lateral recess 34 approximately up to the outline profile of the section 74 of the holding body 10 adjoining the recess 34.
  • the insulating molding 50 has a rear wall 76, on which two strip-shaped projections 78 are formed, which, in cooperation with the projection 68 on the inner insulating molding 48, serve to relieve the strain on the solder connections 36.
  • Two laterally projecting lugs 80 are also formed on the rear wall 76, each of which is provided with an inwardly directed guide strip 82 which fits around the side cheeks 52 of the inner insulating molded part 48 and fixes this in the correct position relative to the transverse hole 32.
  • the molded insulating part 50 is provided with longitudinal grooves 84, which are semicircular in cross-section, for receiving pins 86 on one side and fit into bores 88 in section 74 of the holding body 10.
  • the lugs 80 of the molded insulating part 50 have a support surface 90 on the underside, with which the molded insulating part 50 rests on the wall surface 92 of the holding body 10 delimiting the recess 34.
  • a horizontally protruding tongue 94 is also formed on the rear wall 76, which rests between the side cheeks 52 of the insulating molded part 48 and engages on the wall surface 92 of the holding body 10 and prevents metallic contact of the contact tabs 30 or solder connections 36 with the holding body 10.
  • the molded insulating part 50 is provided with two guide legs 96, which the Reach over side cheeks 62 of the molded insulating part 48 in a suitable manner and together with them form a closed channel for the sheathed cable 40.
  • the rear wall 76 has a recess 98 on the outside, which locally weakens the rear wall 76 to a very thin wall section 99.
  • the cavity surrounding the solder connections 36 between the insulating molded parts 48, 50 is filled with a silicone compound 100.
  • the solder connections 36 are first made in the manner already described and then the inner molded insulating part 48 is inserted into the recess 34. Then, as indicated in FIG. 3, the outer molded insulating part 50 is inserted into the recess 34 from the side and pressed in the joining direction with a defined force.
  • the inner insulating material part 48 is fixed in the correct position and the sheathed cable 40 is deformed between the projections 68, 78 of the parts to relieve the strain.
  • the pins 86 are pressed or pressed into the bores 88 of the holding body 10 while maintaining the force exerted in the joining direction.
  • the bores 88 are arranged in relation to the longitudinal axis of the holding body 10 in such a way that a residual force in the joining direction is maintained after the external joining force has been canceled.
  • the silicone compound 100 is then introduced into the cavity surrounding the soldered connections 36 using an injection needle which is pierced through the thin wall section 99.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP90118924A 1989-11-14 1990-10-04 Kraftstoffeinspritzdüse für Brennkraftmaschinen Expired - Lifetime EP0427947B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3937750 1989-11-14
DE3937750A DE3937750A1 (de) 1989-11-14 1989-11-14 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0427947A1 EP0427947A1 (de) 1991-05-22
EP0427947B1 true EP0427947B1 (de) 1993-03-03

Family

ID=6393444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118924A Expired - Lifetime EP0427947B1 (de) 1989-11-14 1990-10-04 Kraftstoffeinspritzdüse für Brennkraftmaschinen

Country Status (3)

Country Link
EP (1) EP0427947B1 (ja)
JP (1) JP2921596B2 (ja)
DE (2) DE3937750A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108416C2 (de) * 1991-03-15 2000-05-18 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
JP2979467B2 (ja) * 1996-05-10 1999-11-15 株式会社ケーヒン 電磁式燃料噴射弁
DE102006051205A1 (de) * 2006-10-30 2008-05-08 Robert Bosch Gmbh Kraftstoffinjektor mit einer Messeinrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125884A1 (de) * 1981-07-01 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3244245A1 (de) * 1982-11-30 1984-05-30 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE3937750A1 (de) 1991-05-16
JPH03168357A (ja) 1991-07-22
DE59000972D1 (de) 1993-04-08
EP0427947A1 (de) 1991-05-22
JP2921596B2 (ja) 1999-07-19

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