EP0068339A1 - 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
EP0068339A1
EP0068339A1 EP82105328A EP82105328A EP0068339A1 EP 0068339 A1 EP0068339 A1 EP 0068339A1 EP 82105328 A EP82105328 A EP 82105328A EP 82105328 A EP82105328 A EP 82105328A EP 0068339 A1 EP0068339 A1 EP 0068339A1
Authority
EP
European Patent Office
Prior art keywords
nozzle holder
injection nozzle
connecting wires
contact tongues
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.)
Granted
Application number
EP82105328A
Other languages
German (de)
English (en)
Other versions
EP0068339B1 (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. B. 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, as a result of the welded or soldered connections on the contact tongues of the induction coil, a very low contact resistance between the contact tongues and the connecting leads is ensured, regardless of installation tolerances.
  • 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 receiving the connection wires or if, according to a subclaim, the ends of the connection wires are at least are brought out of the nozzle holder so far that the nozzle holder can be lifted from the intermediate plate by a distance that enables the closing spring to be removed.
  • An insulating sleeve can preferably be plugged or glued onto each of the contact bolts, which, with its end facing away from the contact tongue, lies against an annular shoulder of the nozzle holder, which surrounds the through hole for the associated connecting wire. It is thereby achieved that the insulating sleeve serves both as a strain relief for the welded or soldered connection of the contact tongue and the connecting wire and also seals the cavity between the nozzle holder and the intermediate plate which receives the contact tongues and contact bolts against the holes in the nozzle holder which receive the connecting wires and lead into the open.
  • an angled bracket can advantageously also be provided, which is supported at one end on a shoulder surface of the nozzle holder and the other end of which is axially tensioned by a screw on the nozzle holder against elastic plugs, each of which is penetrated by a connecting wire and adhere to each Support a sealing surface surrounding the through hole for the connecting wire on the nozzle holder.
  • a perfect seal between the nozzle holder and the intermediate plate results if the intermediate plate is provided with channels extending from the connection points of the contact tongues for receiving the connecting wires, which bypass the sealing edge or surface formed inside the opening of the chamber in the nozzle holder and into cavities or cutouts of the intermediate plate, which correspond to the bushings for the connecting wires in the nozzle holder.
  • the connecting wires can easily be inserted into the channels of the intermediate plate when the intermediate plate is preassembled if the 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 to 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 on the side of the contact tongues facing away from the nozzle body.
  • the induction coil can be inserted into the washer before connecting to the connecting wires and z. B. can be attached by adhesive.
  • the intermediate disk then forms, so to speak, 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 attachment which is protruded upward from the tongue plane and is preferably bent to form an eyelet open towards the channels.
  • a ground connection to the washer by dripping solder can be avoided if the coil body is provided with the flange projections which engage under the laterally projecting contact tongues and insulate against the washer.
  • connection points of the contact tongues which are recessed in the end face of the intermediate plate, are cast with the connecting wires, a subsequent reworking of this end face, e.g. a lapping process that does not hinder the connection points.
  • the coil former is provided with an annular collar projecting axially beyond the contact tongues, the end face of which preferably lies in the plane of the non-recessed end face sections of the intermediate disk.
  • the ring collar shields the space located centrally above the coil winding against the lateral recesses in the intermediate disk which receive the contact tongues and connection points with the connecting wires, so that the casting compound can, as desired, only be distributed in these lateral spaces.
  • FIG. 1 shows an enlarged longitudinal section through the one exemplary embodiment and FIG. 2 shows a partial region of the injection nozzle according to FIG. 1 on an enlarged scale compared to FIG. 1.
  • Fig. 3 is also an enlarged plan view of the pre-assembled intermediate plate of the second embodiment and Fig. 4 is a section along the line IV-IV in Fig. 3.
  • Fig. 5 shows a plan view corresponding to Fig. 3 of the pre-assembled intermediate plate of the third embodiment and Fig. 6 shows a section along the line VI-VI in Fig. 5.
  • 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 of the intermediate plate 24 and therein by an adhesive is captured.
  • a closing spring 52 for the valve needle 16 which 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, which are approximately at right angles to Project the nozzle axis laterally from the induction coil 44 and extend in a radial recess 58 in the upper end face of the intermediate plate 24 (FIG. 2).
  • a mushroom-shaped contact pin 62 is welded onto the free end 60 of each contact tongue 56, and an insulating sleeve 64 is attached to the outside thereof. This engages with little play in a bore 66 extending from the end face of the nozzle holder 26 in the nozzle holder 26, which merges at an annular shoulder 68 into a smaller bore 70, which passes longitudinally through the nozzle holder 26 and on a flat surface formed on its outer wall 72 flows out.
  • each contact pin 62 the bare end of a connecting wire 74 is soldered, which extends through the bore 70, is led out a little way out of the nozzle holder 26 and is provided at its end with a further connecting contact 76 which is removed from the nozzle holder.
  • 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 74 and are each supported on a conical bearing surface 90 which is formed at the mouth of the bore 70 in the flat surface 72. Due to the axial pressure exerted by the bracket 78, the plugs 88 are pressed radially against the connecting wires 74 and axially against the bearing surfaces 90, which results in the desired sealing of the bores 70.
  • the insulating sleeves 64 bearing on the annular shoulders 68 the welded connections of the contact tongues 56 to the contact bolts 62 are relieved and the radial recess 58 is additionally sealed off from the outside.
  • the described embodiment of an injection nozzle has the advantage that there are no pressure or plug contacts between the contact tongues 56 of the induction coil 44 and the further connection contacts 76, so that overall there is only a low line resistance.
  • the length of the connecting wires 74 protruding from the nozzle holder 26 is dimensioned such that the nozzle holder 26 can be lifted from the intermediate plate 24 by a distance that enables the closing spring 52 to be removed. It is thereby achieved that the nozzle can be disassembled easily and without gontacting measures. B. when setting the opening pressure by inserting washers 54 of different thickness may be desired.
  • an intermediate plate 94 is provided, the end face 96 of which, after installation, which faces an indicated nozzle holder 95, is provided with a central recess 98 for receiving an induction coil 100.
  • Two contact tongues 102 which are connected to the ends of the coil winding and are diametrically opposed and project laterally from the coil body, are formed in this.
  • Each contact tongue 102 is recessed in a recess 104 on the end face 96 of the intermediate plate 94. From each recess 104, a channel 106 leads obliquely downward to the jacket circumference 108 of the intermediate plate 94, where each channel 106 is at an acute angle in a longitudinal groove 110 in the jacket circumference flows into.
  • the two longitudinal grooves 110 are not carried out as far as the lower end face 112, so that this end face is not interrupted and the intermediate plate after assembly of the injection nozzle completely covers an annular channel serving for fuel supply in the adjacent end face of a nozzle body. Furthermore, the radial distance between the bottom surface of the longitudinal grooves 110 and the nozzle axis is the same chosen that after assembly of the parts, the longitudinal grooves correspond to the holes 113 provided in the nozzle holder 95 for passing lead wires 114. Instead of the holes 113, longitudinal grooves could also be provided in the jacket of the nozzle holder 95.
  • the connecting wires 114 are passed through the longitudinal grooves 110 and the channels 106 and welded or soldered to the contact tongues 102 of the induction coil 100. After the parts have been assembled, the connecting wires 114 are pressed against a slightly rounded housing edge 116, which is formed at the opening of the channel 106 into the longitudinal groove 110. The strong deflection of the connecting wires 114 on the housing edges 116 results in a strain relief for the connection of the connecting wires to the contact tongues 102. In addition, 95 additional means for strain relief can be provided on the nozzle holder.
  • the recesses 104 in the intermediate plate 94 are poured out with a suitable material 118, so that the connection point of the parts during a subsequent machining operation of the end face 96, e.g. in a lapping process, does not interfere and sealing of the coil space and the cable bushing against the chamber 50 is achieved.
  • the embodiment according to FIGS. 3 and 4 has the advantage that the connecting wires 114 bypass the sealing surface 124 formed between the nozzle holder 95 and the intermediate plate 94, which immediately adjoins the opening edge 120 of the spring chamber 122 in the nozzle holder 95 and is indicated by dashed lines in FIG , 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 facing the nozzle holder is provided with a central recess 134 for receiving an induction coil 136.
  • the coil body 138 of the 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 which 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 disc are sealed with an insulating potting compound 158.
  • the embodiment according to Figures 5 and 6 h at first also the advantage that the connecting wires 152 bypass the sealing surface between the washer 130 and a nozzle holder, so that this surface is cut at any point and the parts are sealed properly.
  • this arrangement has the further advantage that the induction coil 136 is still connected before the connection wires 152 can be inserted into the washer 130 and anchored therein, after which the connections can be made conveniently from above.
  • the flange lugs 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 formation of the contact tongues 140 as eyelets also ensures that the connecting wires 152 can be inserted into the eyelets for soldering or welding and are held in place by the latter when they are connected.
  • the potting compound 158 hits the contact points unhindered from above, so that these 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)
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 true EP0068339A1 (fr) 1983-01-05
EP0068339B1 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303589A2 (fr) * 1987-08-11 1989-02-15 Automotive Diesel Gesellschaft m.b.H. Injecteur de combustible avec capteur de levée d'aiguille
DE3736198A1 (de) * 1987-10-26 1989-05-18 Voest Alpine Automotive Kraftstoffeinspritzduese fuer brennkraftmaschinen
EP0427271A1 (fr) * 1989-11-09 1991-05-15 Yamaha Hatsudoki Kabushiki Kaisha Ensemble d'injection de combustible à haute pression
EP0427947A1 (fr) * 1989-11-14 1991-05-22 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne

Families Citing this family (6)

* 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
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
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024531A2 (fr) * 1979-08-25 1981-03-11 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Dispositif d'injection de carburant pour moteurs à combustion interne
GB2056557A (en) * 1979-08-10 1981-03-18 Bosch Gmbh Robert Fuel injection nozzle

Family Cites Families (5)

* 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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2056557A (en) * 1979-08-10 1981-03-18 Bosch Gmbh Robert Fuel injection nozzle
EP0024531A2 (fr) * 1979-08-25 1981-03-11 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Dispositif d'injection de carburant pour moteurs à combustion interne

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303589A2 (fr) * 1987-08-11 1989-02-15 Automotive Diesel Gesellschaft m.b.H. Injecteur de combustible avec capteur de levée d'aiguille
EP0303589A3 (fr) * 1987-08-11 1990-01-31 Automotive Diesel Gesellschaft m.b.H. Injecteur de combustible avec capteur de levée d'aiguille
DE3736198A1 (de) * 1987-10-26 1989-05-18 Voest Alpine Automotive Kraftstoffeinspritzduese fuer brennkraftmaschinen
EP0427271A1 (fr) * 1989-11-09 1991-05-15 Yamaha Hatsudoki Kabushiki Kaisha Ensemble d'injection de combustible à haute pression
EP0427947A1 (fr) * 1989-11-14 1991-05-22 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne

Also Published As

Publication number Publication date
DE3262968D1 (en) 1985-05-15
JPH039306B2 (fr) 1991-02-08
DE3125884A1 (de) 1983-01-20
US4482093A (en) 1984-11-13
JPS5810153A (ja) 1983-01-20
EP0068339B1 (fr) 1985-04-10

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