WO1987005682A1 - Bougie de prechauffage a element gaine pour moteurs diesel - Google Patents

Bougie de prechauffage a element gaine pour moteurs diesel Download PDF

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Publication number
WO1987005682A1
WO1987005682A1 PCT/DE1987/000084 DE8700084W WO8705682A1 WO 1987005682 A1 WO1987005682 A1 WO 1987005682A1 DE 8700084 W DE8700084 W DE 8700084W WO 8705682 A1 WO8705682 A1 WO 8705682A1
Authority
WO
WIPO (PCT)
Prior art keywords
filament
glow
connecting bolt
glow plug
helix
Prior art date
Application number
PCT/DE1987/000084
Other languages
German (de)
English (en)
Inventor
Paul Garaud
Heinz Heber
Gerhard HÜFTLE
Albert Weitten
Matthias Welker
Wolf Wessel
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 WO1987005682A1 publication Critical patent/WO1987005682A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/006—Ignition installations combined with other systems, e.g. fuel injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs

Definitions

  • the invention relates to a glow plug for arrangement as a starting aid in the combustion chamber or intake pipe of diesel engines according to the type defined in the preamble of claim 1.
  • the glow plug according to the invention with the characterizing features of claim 1 has the advantage that the assembly process of the glow plug is advantageously accessible to automation.
  • the incandescent filament is namely only dimensioned at its end region facing the incandescent filament in such a way that it firmly encompasses the ignition-side end section of the connecting bolt, that is to say is thus pre-fixed, and that this connection is secured as a result of the known reduction in diameter of the incandescent tube; This diameter reduction then takes place after the initially free ignition-side end of the filament has been welded to the ignition-side end of the glow tube, then the filament has been drawn to its prescribed length by means of the pre-fixed connecting bolt and the remaining interior of the glow tube has been filled with an insulating powder as usual.
  • a deformation of the filament is largely excluded with this procedure.
  • An additional operation such as. B. welding or caulking the filament on the connecting bolt, is not required.
  • the centering of the filament and connection bolt is reliably ensured.
  • the manufacture of the incandescent filament is simplified since the bending and alignment of the axially projecting filament beginning are eliminated. By eliminating the bending point and one by fastening, z. B. caulking, weakening of the spiral wire caused, the risk of spiral breakage is reduced.
  • reduction of the glow tube i.e. H. when the diameter is reduced by hammering, a very good electrical contact between the connecting bolt and the filament is achieved.
  • FIG. 1 shows a longitudinal section of a glow plug for a diesel engine
  • FIG. 2 shows a longitudinal section of a flair glow plug for a diesel engine
  • Figure 5 shows a connecting pin according to another embodiment of the invention.
  • the glow plug shown in FIG. 1 as a longitudinal section as an exemplary embodiment is arranged in the combustion chamber of a diesel engine and serves to increase the temperature in the combustion chamber during the starting process.
  • This glow plug is arranged in a glow plug system, not shown, and is connected to an electric battery via a preheating position of a glow start switch.
  • the glow plug has a plug housing 10 with a screw thread 11 for screwing the glow plug into the combustion chamber of the diesel engine.
  • a connecting bolt 13 is kept insulated from the candle housing 10.
  • an insulating sleeve 14 encloses the connecting bolt 13, which in turn is pressed into a recess in the end face of the candle housing 10 by a nut 15 which can be screwed onto the connecting bolt 13.
  • the connecting bolt 13 is overlapped by a glow tube 16, which is closed at the end, which in turn is part is enclosed by the candle housing 10.
  • a glow tube 16 which is closed at the end, which in turn is part is enclosed by the candle housing 10.
  • an electrically insulating seal 20 made of heat-resistant material is arranged between the glow tube 16 and the connecting bolt 13, so that the interior of the glow tube 16 is sealed from the environment.
  • An incandescent filament 17 is seated at one end on the connecting bolt 13 and is welded at its other end to the end region of the glow tube 16.
  • the remaining cavity of the glow tube 16 is filled with an insulating powder 18, which is known to preferably consist of magnesium oxide.
  • the connecting bolt 13 As can be seen in the enlarged representations of FIGS. 3 and 4, the connecting bolt 13 according to a first embodiment of the invention carries in its filament-side end region 19 an external thread 19a which is designed such that the initial turns of the filament 17 are screwed onto this external thread 19a can and practically have hardly any play.
  • the connecting bolts 13 glow tube 16, incandescent filament 17, insulating material 18 and seal 20
  • the correspondingly dimensioned initial turns of one end section of the incandescent filament 17 are first screwed onto the external thread 19a of the connecting bolt 13; these initial turns of the filament 17 are free of play in the external thread 19a.
  • the free end of the end region 19 is provided with a taper 19b in the direction of the incandescent filament 17.
  • the filament 17 is inserted with its free end into the glow tube 16 and welded with its free end section in the end region of the glow tube 16 which is closed at the end.
  • the filament 17 is pulled to the prescribed length by pulling on the connecting bolt 13 and then the powdery insulating material 18 is filled into the glow tube 16; then the hose-like, electrically insulating seal 20 is pushed onto the connecting bolt 13 and between the open end region of the glow tube 16 and the connecting bolt 13 arranges.
  • the subsequent known reduction in diameter of the glow tube 13 e.g.
  • the incandescent filament 17 can consist of commercially available resistance material based on nickel-chromium or chromium-iron-aluminum. Frequently, however, a material with a strongly positive resistance temperature coefficient is used for the filament, so that the current consumption of the glow plug is large in the cold state and decreases with increasing heating; due to this resistance characteristic, the glow plug heats up relatively quickly, but prevents the filament from burning out. In order to reduce the so-called preheating time of such glow plugs even more, the arrangement of a glow filament has recently been used, which is composed of a heating filament and a regulating filament connected in series therewith with a positive resistance temperature coefficient.
  • the flame glow plug shown in longitudinal section in FIG. 2 as the second exemplary embodiment has the identically designed assembly of connecting bolts 13 ', glow tube 16', filament 17 ', insulating material 18' and seal 20 '.
  • This assembly is in turn provided with an insulating sleeve 14 'and a nut 15'.
  • the plug housing 10 'of this flame glow plug surrounds the glow tube 16' at a distance.
  • a flame sleeve 21 ' is inserted into the candle housing 10', into which the glow tube 16 'protrudes further.
  • the glow tube 16 ' In its central area, the glow tube 16 'is coaxial with little Distance surrounded by an evaporator tube 22 * to which fuel is supplied via a fuel inflow 23 '.
  • the operation of this flame glow plug to be arranged in the intake pipe of the diesel engine is known.
  • the glow tube 16' is assembled after the assembly by a method such as e.g. . B. rotary hammers reduced in diameter in a known manner and consequently has a compacted insulating powder 18 'and a filament 17' secured on the connecting bolt 13 '.
  • the connecting bolt 13 "of which is shown in FIG. 5 the end region 19a" of the connecting bolt 13 "which is firmly encompassed by the end section (not shown) of the filament is designed as a cylinder 19c connection-side turns of the incandescent filament are in turn dimensioned such that they enclose the cylinder 19c firmly, that is to say with mechanical pretensioning, it is advantageous if the surface of the cylinder 19c is rough, for example overturned with a rough feed. including reducing the diameter of the glow tube correspond to the examples described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)

Abstract

Une bougie de préchauffage à élément gainé destinée à servir d'aide au démarrage dans la chambre à combustion ou dans le collecteur d'admission de moteurs diesel est pourvue d'un goujon de connexion (13), d'un élément hélicoïdal de préchauffage (17) fixé à une de ses extrémités et noyé dans une poudre isolante (18) et d'un tube à incandescence (16) entourant l'élément hélicoïdal incandescence de manière coaxiale et à une certaine distance. De manière à faciliter l'assemblage, le centrage approprié de l'élément hélicoïdal à incandescence (17) et du goujon de connexion (13), et de manière à réduire le danger de cassure de l'élément hélicoïdal, la section extrême de l'élément hélicoïdal (17) sur le côté de connexion est initialement fixé à la région extrême libre du goujon de connexion (13) uniquement dans le but de l'entourer fermement, puis il est fixé à demeure par réduction ultérieure du diamètre du tube à incandescence (16) qui est rempli d'une poudre isolante (18). La région extrême (19) du goujon de connexion (13) entouré par l'élément hélicoïdal à incandescence (17) peut ainsi être conçue comme un filet externe (19a) ou également comme un cylindre (19c).
PCT/DE1987/000084 1986-03-14 1987-02-28 Bougie de prechauffage a element gaine pour moteurs diesel WO1987005682A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3608528 1986-03-14
DEP3608528.6 1986-03-14
DE19863638164 DE3638164A1 (de) 1986-03-14 1986-11-08 Gluehstiftkerze fuer dieselmotoren
DEP3638164.0 1986-11-08

Publications (1)

Publication Number Publication Date
WO1987005682A1 true WO1987005682A1 (fr) 1987-09-24

Family

ID=25841965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000084 WO1987005682A1 (fr) 1986-03-14 1987-02-28 Bougie de prechauffage a element gaine pour moteurs diesel

Country Status (3)

Country Link
EP (1) EP0263838A1 (fr)
DE (1) DE3638164A1 (fr)
WO (1) WO1987005682A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1966664A1 (de) * 1969-12-17 1973-09-20 Adolf Linka Vorrichtung zur gesteuerten fachbildung bei wellenfachwebmaschinen
DE3915224A1 (de) * 1989-05-10 1990-11-15 Bosch Gmbh Robert Gluehstiftkerze

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB472814A (en) * 1936-03-30 1937-09-30 Stone J & Co Ltd Improvements in ignition plugs for internal combustion engines
GB1215013A (en) * 1967-04-05 1970-12-09 Wire Products & Machine Design Improvements in or relating to encased electric heating elements
DE2637435A1 (de) * 1976-08-20 1978-02-23 Bosch Gmbh Robert Gluehstiftkerze fuer brennkraftmaschinen
GB2014063A (en) * 1978-02-10 1979-08-22 Gen Motors Corp Electrical heater and method of making

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB472814A (en) * 1936-03-30 1937-09-30 Stone J & Co Ltd Improvements in ignition plugs for internal combustion engines
GB1215013A (en) * 1967-04-05 1970-12-09 Wire Products & Machine Design Improvements in or relating to encased electric heating elements
DE2637435A1 (de) * 1976-08-20 1978-02-23 Bosch Gmbh Robert Gluehstiftkerze fuer brennkraftmaschinen
GB2014063A (en) * 1978-02-10 1979-08-22 Gen Motors Corp Electrical heater and method of making

Also Published As

Publication number Publication date
EP0263838A1 (fr) 1988-04-20
DE3638164A1 (de) 1987-09-17

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