EP0068339B1 - Buse d'injection de carburant pour moteurs à combustion interne - Google Patents

Buse d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0068339B1
EP0068339B1 EP82105328A EP82105328A EP0068339B1 EP 0068339 B1 EP0068339 B1 EP 0068339B1 EP 82105328 A EP82105328 A EP 82105328A EP 82105328 A EP82105328 A EP 82105328A EP 0068339 B1 EP0068339 B1 EP 0068339B1
Authority
EP
European Patent Office
Prior art keywords
intermediate plate
contact tongues
injection nozzle
nozzle
nozzle holder
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
EP82105328A
Other languages
German (de)
English (en)
Other versions
EP0068339A1 (fr
Inventor
Martin Ing. Grad. Hafner
Karl Ing. Grad. Hofmann
Josef Dipl.-Ing. Schlagenhauf
Gerhard Dipl.-Ing. Stumpp
Dietrich Dipl.-Ing. Trachte
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 EP0068339A1 publication Critical patent/EP0068339A1/fr
Application granted granted Critical
Publication of EP0068339B1 publication Critical patent/EP0068339B1/fr
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 injection nozzle according to the preamble of the main claim.
  • the valve needle influences the magnetic circuit of the induction coil by its speed, signals which are dependent on the needle speed being generated, e.g. for a device for determining and evaluating the start of spraying and / or the spraying duration.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the induction coil makes perfect contact as a result of the welded or soldered connections on the contact tongues, regardless of installation tolerances, and the chamber accommodating the closing spring in the nozzle holder is completely sealed off from the holes for the connecting lines.
  • the injection nozzle can still be disassembled without contacting measures if the further connection contacts are not attached to the nozzle holder, but are only arranged at the ends of the connection wires and can be pulled through the holes or slots in the nozzle holder that receive the connection wires, or if the ends of the connection wires are at least as far are led out of the nozzle holder so that the nozzle holder can be lifted from the intermediate plate by a distance which enables the closing spring to be removed.
  • the connecting wires can be easily inserted into the channels of the intermediate plate when the intermediate plate is preassembled if its recesses corresponding to the through-holes in the nozzle holder are formed by longitudinal grooves in the circumference of the jacket.
  • strain relief of the welded or soldered connections of the connecting wires with the contact tongues can also be obtained without additional means if the channels in the intermediate plate open at an acute angle into the further longitudinal grooves on the circumference of the jacket of the intermediate plate.
  • connection points of the connecting wires with the contact tongues are located in a recess in the intermediate plate that is open towards the nozzle holder.
  • the induction coil can be inserted into the washer before connecting it to the connecting wires and e.g. be fixed by glue.
  • the intermediate disk then forms, as it were, a holding device for the induction coil when the connecting wires are soldered or welded on.
  • proper potting of the connection points is made considerably easier by insulating potting compound.
  • a secure connection of the connecting wires with the contact tongues of the induction coil is obtained if the contact tongues are each provided with a welding or soldering lug protruding upwards from the tongue plane, preferably to form an eyelet that is open towards the channels.
  • FIG. 1 shows an enlarged longitudinal section through the first exemplary embodiment
  • FIG. 2 likewise shows an enlarged plan view of the preassembled intermediate plate of the exemplary embodiment according to FIG. 1
  • FIG. 3 shows a section along the line 111-111 in FIG. 2
  • FIG. 4 2 shows a plan view corresponding to FIG. 2 of the preassembled intermediate plate according to the second exemplary embodiment
  • FIG. 5 shows a section along the line VV in FIG. 4.
  • the injection nozzle according to FIGS. 1 to 3 has a nozzle body 10, in which a valve seat 12 is formed, to which a nozzle opening 14 connects.
  • the valve seat 12 is monitored by a valve needle 16, which is displaceably mounted in the nozzle body 10 and is provided with a pressure shoulder 20 in the region of a pressure chamber 18 arranged upstream of the valve seat 12.
  • the nozzle body 10 is clamped to a nozzle holder 26 by means of a union nut 22 via an intermediate plate 24. From a connection bore 28 in the nozzle holder 26, the fuel passes through a channel 30 into a local recess 32 in the upper end face of the intermediate plate 24, which is connected via a bore 34 to an annular groove 36 in the upper end face of the nozzle body 10.
  • An index pin not visible in the drawing, ensures that the parts are in the correct position when assembled.
  • a channel 38 leads from the annular groove 36 into the pressure chamber 18 of the nozzle body 10.
  • the valve needle 16 is provided with a reduced-diameter projection 40, which passes through a bore 42 of the intermediate plate 24 with play and protrudes into the central opening of an induction coil 44, which is inserted into a larger-diameter bore 45 of the intermediate plate 24 and therein through a Glue is held.
  • a closing spring 52 for the valve needle 16 acts on the pressure piece 48 and is supported on the bottom of the chamber 50 via an intermediate disk 54 of a certain thickness.
  • the induction coil 44 is provided with two resilient connection contact tongues 56 (FIG. 2) which protrude laterally from the induction coil 44 approximately at a right angle to the nozzle axis and are each deepened in a radial recess 58 in the end face of the intermediate plate 24 facing the nozzle holder 26 extend.
  • a channel 60 leads obliquely downward from each recess 58 to the circumference of the jacket 62 of the intermediate plate 24, where each channel 60 opens at an acute angle into a longitudinal groove 64 in the circumference of the jacket.
  • the two longitudinal grooves 64 are not carried out as far as the lower end face 66 of the intermediate plate 24, so that this end face is not interrupted and the intermediate plate completely covers the annular groove 36 in the nozzle body 10 after assembly of the injection nozzle.
  • the longitudinal grooves 64 are arranged such that, after the parts have been assembled, they correspond to longitudinal bores 67 in the nozzle holder 26, which open out on a flat surface 68 of the nozzle holder 26.
  • connection wires 70 are soldered to the contact tongues 56, which extend through the channels 60, the longitudinal grooves 64 and longitudinal bores 67 and are led out of the nozzle holder 26 to a certain extent.
  • connection wires 70 are each provided with a further connection contact 76 which is removed from the nozzle holder 26.
  • a multi-angled bracket 78 is provided, one end 80 of which is supported on a shoulder surface 82 of the nozzle holder 26.
  • the other end 84 of the bracket 78 is tensioned by a screw 86 screwed into the nozzle holder 26 against two elastic plugs 88 one behind the other in the drawing.
  • the plugs 88 are each penetrated by one of the connecting wires 70 and are each supported on a conical bearing surface 90, which is formed at the mouth of the bore 67 in the flat surface 68. As a result of the axial pressure exerted by the bracket 78, the plugs 88 are pressed radially against the connecting wires 70 and axially against the contact surfaces 90, which results in the desired sealing of the bores 67.
  • the connecting wires 70 are pressed against a slightly rounded housing edge 92, which is formed at the opening of the channel 60 into the longitudinal groove 64.
  • the strong deflection of the connecting wires 70 on the housing edges 92 results in a strain relief for the connection of the connecting wires to the contact tongues 56.
  • further means for strain relief can be provided on the nozzle holder 26.
  • the embodiment according to FIGS. 1 to 3 has the advantage that the connecting wires 70 form the sealing surface formed between the nozzle holder 26 and the intermediate plate 24, directly adjoining the opening edge 94 of the spring chamber 50 in the nozzle holder 26 and indicated in FIG. 2 with dashed lines 96 bypass, so that this sealing surface is not cut at any point and the parts are properly sealed.
  • an intermediate plate 130 is provided, the end face 132 of which facing the nozzle holder is provided with a central recess 134 for receiving an induction coil 136.
  • two metallic contact tongues 140 are formed which are connected to the ends of the coil winding and are diametrically opposed and project laterally from the coil body 138.
  • Each contact tongue 140 is recessed in a recess 142 in the end face 132 of the intermediate plate 130.
  • Two diametrically opposed flange projections 144 are formed on the coil housing 138, on which the contact tongues 140 rest at the top and which fit into the recesses 142 at the bottom 146 thereof they lie on.
  • Each contact tongue 140 is provided on the upper side with a raised soldering or welding projection 148, which has the shape of an eyelet that is open to the side. From this side, a bore 150 opens into each recess 142, through which a connecting wire 152 is passed, the bare end 154 of which engages between the two legs of the soldering or welding attachment 148 of the contact tongue 140.
  • the coil housing 138 is also provided at the upper end with an annular collar 156 which extends approximately to the upper end face of the intermediate disk 130. The annular space between the wall of the recess 134 and the annular collar 156 and the recesses 142 in the intermediate panes are sealed with an insulating potting compound 158.
  • connection wires 152 bypass the sealing surface between the intermediate disk 130 and a nozzle holder, so that this surface is not cut at any point and the parts are sealed properly.
  • this arrangement has the further advantage that the induction coil 136 can be inserted and anchored in the intermediate disk 130 before the connection wires 152 are connected, after which the connections can be made conveniently from above.
  • the flange attachments 144 of the coil housing 138 prevent dripping solder from reaching the bottom 146 of the washer 130 and thereby producing a ground connection.
  • the configuration of the contact tongues 140 as eyelets also means that the connecting wires 152 can be inserted into the eyelets for soldering or welding and are held in the correct position when they are connected.
  • the potting compound 158 hits the contact points unhindered from above, so that they are properly enclosed and insulated.

Landscapes

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

Claims (8)

1. Injecteur de carburant pour moteurs à combustion interne, pourvu d'un corps d'injecteur (10); qui forme un orifice d'injecteur (14), loge un pointeau de soupape (16) et est serré contre la face frontale d'un porte-injecteur (26) qui comporte une chambre (50), accessible depuis la face frontale, pour recevoir un ressort de fermeture (52) agissant sur le pointeau de soupape (16), et pourvu en outre d'une plaque intermédiaire (24, 130) enserrée entre le corps d'injecteur (10) et le porte-injecteur (26) et dans laquelle est insérée une bobine d'induction (44, 136), dans laquelle est indroduite l'extrémité (40) du pointeau de soupape (16) située à l'opposé de l'orifice (14) de l'injecteur et qui est munie de deux lames de contact (56, 140) faisant saillie latéralement, qui sont reliées de façon électriquement conductrice à des fils de raccordement (70, 152) passant à travers le porte-injecteur (26) et pourvus de contacts de raccordement (76) plus loin, caractérisé en ce que les lames de contact (56, 140) de la bobine d'induction (44, 136) sont reliées de façon inamovible par soudure ou brasure, aux fils de raccordement (70, 152), et en ce que la plaque intermédiaire (24, 130) est pourvue de canaux (60, 150) partant des points de jonction des lames de contact (56, 140) et servant à recevoir les fils de raccordement (70, 152), qui contournent le bord d'étenchéité ou surface d'étanchéité (96) constituée intérieurement au bord d'ouverture (94) de la chambre (50) prévue dans le porte-injecteur (26) et mènent dans des cavités ou évidements (64) de la plaque intermédiaire (24, 130), qui correspondent avec les passages (67) ménagés pour les fils de raccordement (70, 152) dans le porte-injecteur (26).
2. Injecteur selon la revendication 1, caractérisé en ce que les évidements de la plaque intermédiaire (24,130) correspondant avec les passages (67) ménagés dans le porte-injecteur (26) sont formés par des gorges longitudinales (64) prévues dans le pourtour latéral de la plaque intermédiaire.
3. Injecteur selon la revendication 2, caractérisé en ce que les canaux (60) prévus dans la plaque intermédiaire (24) débouchent selon un angle aigu dans les gorges longitudinales (64), menant plus loin, ménagées sur son pourtour latéral.
4. Injecteur selon la revendication 1 ou 2, caractérisé en ce que les points de jonction des fils de raccordement (70, 152) avec les lames de contact (56, 140) se trouvent dans un évidement (58, 142) ménagé dans la plaque intermédiaire (24, 130), ouvert vers le porte-injecteur (26).
5. Injecteur selon la revendication 4, caractérisé en ce que les lames de contact (140) sont pourvues chacune d'un appendice (148) soudé ou brasé, sortant, vers le haut, du plan de la lame, de préférence recourbé en formant un oeillet ouvert en direction des canaux (150).
6. Injecteur selon l'une des revendications précédentes, caractérisé en ce que l'armature (138) de la bobine est pourvue d'appendices de bride (144) s'appliquant par en-dessous contre les lames de contact (140) faisant saillie latéralement et assurant l'isolation vis-à-vis de la plaque intermédiaire (130).
7. Injecteur selon l'une des revendications 4 à 6, caractérisé en ce que les points de jonction, disposés en profondeur dans la surface frontale de la plaque intermédiaire (24, 130), des lames de contact (56, 140) aves les fils de raccordement (70, 152) sont scellés.
8. Injecteur selon la revendication 7, caractérisé en ce que l'armature (138) de la bobine est munie d'un collet annulaire (156) faisant saillie axialement au-dessus des lames de contact ( 140), et dont la face frontale se situe de préférence dans le plan des tronçons non évidés de la surface frontale (132) de la plaque intermédiaire (130).
EP82105328A 1981-07-01 1982-06-18 Buse d'injection de carburant pour moteurs à combustion interne Expired EP0068339B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3125884 1981-07-01
DE19813125884 DE3125884A1 (de) 1981-07-01 1981-07-01 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0068339A1 EP0068339A1 (fr) 1983-01-05
EP0068339B1 true EP0068339B1 (fr) 1985-04-10

Family

ID=6135819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105328A Expired EP0068339B1 (fr) 1981-07-01 1982-06-18 Buse d'injection de carburant pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4482093A (fr)
EP (1) EP0068339B1 (fr)
JP (1) JPS5810153A (fr)
DE (2) DE3125884A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3515264A1 (de) * 1985-04-27 1986-11-27 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3726712A1 (de) * 1987-08-11 1989-04-27 Voest Alpine Automotive Kraftstoff-einspritzduese mit nadelhubsensor
DE3736198A1 (de) * 1987-10-26 1989-05-18 Voest Alpine Automotive Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3819974C1 (en) * 1988-06-11 1989-01-12 Robert Bosch Gmbh, 7000 Stuttgart, De Standard unit with multipart housing body, especially fuel injection nozzle for internal combustion engines
JPH03156165A (ja) * 1989-11-09 1991-07-04 Yamaha Motor Co Ltd 高圧燃料噴射装置の給電線取出構造
DE3937750A1 (de) * 1989-11-14 1991-05-16 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
JPH03188414A (ja) * 1989-12-18 1991-08-16 Ishiyama Megane Kk メタル眼鏡部品における擬似七宝モザイク模様化粧法
US5895844A (en) * 1997-05-29 1999-04-20 Outboard Marine Corporation Precise fuel flow measurement with modified fluid control valve
GB9805854D0 (en) * 1998-03-20 1998-05-13 Lucas France Fuel injector
US7055513B1 (en) * 2004-11-23 2006-06-06 John Boveia Spacer plate for use with internal combustion engines

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55161957A (en) * 1979-06-05 1980-12-16 Nippon Denso Co Ltd Solenoid type fuel injection valve
DE2925187A1 (de) * 1979-06-22 1981-01-08 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE2932480A1 (de) * 1979-08-10 1981-02-26 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE2934476A1 (de) * 1979-08-25 1981-03-26 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Brennstoffeinspritzvorrichtung fuer brennkraftmaschinen
US4273409A (en) * 1979-09-04 1981-06-16 Victor Electric Wire & Cable Connector having low profile contact element
DE3004424A1 (de) * 1980-02-07 1981-08-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduesenhalter
JPS6115252Y2 (fr) * 1981-05-19 1986-05-12

Also Published As

Publication number Publication date
DE3262968D1 (en) 1985-05-15
DE3125884A1 (de) 1983-01-20
US4482093A (en) 1984-11-13
JPS5810153A (ja) 1983-01-20
EP0068339A1 (fr) 1983-01-05
JPH039306B2 (fr) 1991-02-08

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