EP3247941A1 - Bougie-crayon de préchauffage - Google Patents

Bougie-crayon de préchauffage

Info

Publication number
EP3247941A1
EP3247941A1 EP16700827.5A EP16700827A EP3247941A1 EP 3247941 A1 EP3247941 A1 EP 3247941A1 EP 16700827 A EP16700827 A EP 16700827A EP 3247941 A1 EP3247941 A1 EP 3247941A1
Authority
EP
European Patent Office
Prior art keywords
glow
housing
heating coil
glow tube
dome
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.)
Withdrawn
Application number
EP16700827.5A
Other languages
German (de)
English (en)
Inventor
Emilien MARCHAL
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 EP3247941A1 publication Critical patent/EP3247941A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F23Q2007/004—Manufacturing or assembling methods

Definitions

  • the present invention relates to a process for producing a
  • Glow plug according to claim 1 and a glow plug for a
  • glow plugs are provided to heat the individual combustion chambers of the engine so far that a fuel injected into the combustion chamber safely ignites under the compression of the piston moving upward.
  • the glow plug on a glow tube which is closed on its end facing the combustion chamber.
  • the one end of a heating coil is also connected to the combustion chamber facing the end of the glow tube.
  • the connection point is relatively difficult to access, and in the welding can lead to oxidation of the heating coil, which reduce the life of a glow plug and lead to premature failure.
  • glow plugs are known from the prior art, which have a multi-part glow tube with a dome, which combustion chamber side on the
  • a glow plug is known, in which the glow tube is formed in two parts and in which a dome is welded onto the cylindrical part of the glow tube.
  • An object of the invention is therefore to provide a glow plug, which is characterized by a simple production and overcomes the disadvantages known from the prior art.
  • the glow plug according to the invention with the features of claim 1 has the advantage that at least one of the components mentioned in the preamble or a functional unit of two or more of the components mentioned in the preamble is produced by means of a rapid prototyping method.
  • a rapid prototyping process in particular by a so-called 3D printing, a complex geometry can be produced without expensive tools. This reduced the costs as well as the production time at the
  • Functional unit consists of a dome of the glow tube and an associated portion of the heating coil.
  • the dome of the glow tube and an associated portion of the heating coil are particularly well suited for being manufactured by means of a rapid prototyping method.
  • a trained at the top portion of the heating coil can be formed so that it is beyond the open side of the dome out and can be particularly easily welded to the rest of the heating coil. It is also possible to produce the complete heating coil by means of the rapid prototyping method and to represent the connection point between the heating coil and a control coil through a downstream connection step.
  • the section of the heating coil connected to the hot-melt element and the hot-melt element itself are preferably made of the same material, but it is also possible to apply different materials in several work steps in the context of rapid prototyping.
  • the component produced by the rapid prototyping method or the functional unit are connected to a further component of the glow plug. This makes it particularly easy and inexpensive to produce a glow plug, for example, by existing, or with cutting
  • Manufacturing process is used easily manufactured components, which are connected to the manufactured by rapid prototyping process component or the functional unit produced in this way. Such a construction can save time and money in the development and production of glow plugs.
  • the portion of the heating coil connected to the dome is welded to the remaining heating coil or a control coil of the glow plug, and in a second process step, the dome is welded to the cylindrical portion of the glow tube.
  • the accessibility to the welding point between the sections of the heating coil can be increased by elastically stretching the heating coil and / or the control coil connected to the heating coil so that a distance between the dome and the cylindrical section of the glow tube is created by reversible stretching allows a supply of welding electrodes to the sections of the heating coil.
  • the glow tube is closed on its end facing away from the housing by a dome, wherein at least one turn of the heating coil is formed on the dome.
  • the energy required for welding can be introduced very targeted by means of laser, whereby the melting in the welding area can be kept small and an undesirable entry of oxygen can be avoided.
  • a preferred embodiment of the glow plug is characterized in that the glow tube is closed at its end facing away from the housing by a prefabricated dome, wherein at least one turn of the heating coil is formed at the top, and wherein the prefabricated dome with the at least one turn of the heating coil is welded to the glow tube.
  • the glow plug is characterized by the fact that a particularly clean and high-quality welding of the connected with the dome winding and the remaining heating coil is possible. This allows the
  • the dome and / or the at least one turn of the heating coil have a height of about 2mm to 5mm. This can ensure that the dome can be welded to the cylindrical part of the glow tube and the weld is not in the
  • Transition area is and is weakened by additional tensions by forming the dome. Furthermore, it can be ensured that at least one turn of the heating coil is formed and so a sufficient
  • Overlap area is formed for a weld with the remaining heating coil.
  • FIG. 1 shows the structure of a dome according to the invention for a glow plug
  • FIG. 2 shows the structure of a glow plug according to the invention, wherein the dome and formed on the dome portion of a heating coil are connected to a cylindrical portion of the glow tube and arranged in the cylindrical portion heating coil in a
  • Fig. 3 shows a glow plug according to the invention in a 3D view.
  • Fig. 1 shows a tip 34 of a glow plug 10 according to the invention.
  • the dome 34 has a cup-shaped contour.
  • the dome 34 is made of a metallic and preferably weldable material by means of a rapid prototyping method, for example by means of a 3D printer.
  • the top 34 has a portion 37 of a heating coil 32 connected to the dome. Shown is section 37 with about two turns 35, but it can also be more or fewer turns 35 formed on the portion 37 of the heating coil 32.
  • the dome has a diameter Di and a height h, wherein the height h is preferably between 2mm and 5mm.
  • the dome 34 has a corresponding thermal stability and corrosion resistance, so that they are used in the combustion chamber of a self-igniting
  • the dome 34 with the formed at the top 34 section 37 of the heating coil 32 is a functional unit 40.
  • Fig. 2 is a section through a glow plug according to the invention is shown.
  • the glow plug 10 has a housing 20 in which a connection contact 22 is arranged.
  • the terminal contact 22 is electrically insulated from the housing 20 and connected to a control coil or a heating coil 32.
  • the heating coil 32 and a possibly existing control coil are in a glow tube
  • the glow tube 30 is connected to the housing 20.
  • the glow tube 30 is on its combustion chamber facing end 31st
  • the heating coil 32 is connected to the end 31 of the glow tube in such a way that an electric current which flows through the heating coil 32 and heats it, heats the end 31 of the glow tube 30, so that the
  • the end 31 of the glow tube 30 is formed as a dome 34, wherein the dome 34 with a cylindrical portion 38th of the glow tube 30 is connected.
  • a section 37 of the heating coil 32 is formed on the dome 34, which is welded to a section 33 of the heating coil 32 which is arranged in the cylindrical section 38 of the glow tube 30.
  • the cylindrical portion 38 of the glow tube 30 in this case has a diameter D2, which corresponds to the diameter Di of the dome 34, so that a clean welding of the two Glührohrmaschine 34,38 is possible, wherein a connection point 39 is formed.
  • connection point 39 can be formed both by means of welding electrodes and by means of a laser.
  • an electrically insulating, but thermally conductive powder 49 is filled, which transfers the heat generated in the heating coil 32 to the glow tube 30 and at the same time represents an electrical insulation between the heating coil 32 and the cylindrical portion 38 of the glow tube 30, so that Current flow through the top 34 and here abut the highest temperatures for heating the combustion chamber during operation of the glow plug 10.
  • the insulating powder is filled in the glow tube 30 after the cylindrical portion 38 and the tip 34 have been welded together and further compressed in a later step.
  • a glow plug 10 according to the invention is shown in a 3D view.
  • the glow plug has a housing 20 and a glow tube 30, wherein the glow tube 30 has a first region 41 with a diameter D3 and a second region 42 with a diameter D2, wherein the diameter D3 in the first region 41 is greater than the diameters Di and D2 at the junction between the cylindrical portion 38 of the glow tube 30 and dome 34 is.
  • the glow tube 30 can be made with kontantem diameter, wherein the first region 41 then has the same diameter as the second region 42 and the junction 39 at the top 34.

Landscapes

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

Abstract

La présente invention concerne une bougie-crayon de préchauffage (10) pour un moteur à combustion interne à auto-allumage, ainsi qu'un procédé de fabrication d'une bougie-crayon de préchauffage (10). Ladite bougie-crayon de préchauffage (10) présente un boîtier (20), un contact de connexion (22) placé au moins en partie dans ledit boîtier (20), et au moins un tube à incandescence (30) relié directement au boîtier (20). Ledit tube à incandescence (30) est fermé au niveau de son extrémité (31) opposée au boîtier (20). Une spirale chauffante (32) située dans le tube à incandescence (30) peut être connectée au contact de connexion (22). Au moins un des composants susmentionnés (20,22,30,32) ou une unité fonctionnelle (40) composée d'au moins deux des composants susmentionnés (20,22,30,32) est fabriqué au moyen d'un procédé de prototypage rapide.
EP16700827.5A 2015-01-20 2016-01-18 Bougie-crayon de préchauffage Withdrawn EP3247941A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015200778.2A DE102015200778A1 (de) 2015-01-20 2015-01-20 Glühstiftkerze
PCT/EP2016/050852 WO2016116385A1 (fr) 2015-01-20 2016-01-18 Bougie-crayon de préchauffage

Publications (1)

Publication Number Publication Date
EP3247941A1 true EP3247941A1 (fr) 2017-11-29

Family

ID=55173838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16700827.5A Withdrawn EP3247941A1 (fr) 2015-01-20 2016-01-18 Bougie-crayon de préchauffage

Country Status (4)

Country Link
EP (1) EP3247941A1 (fr)
CN (1) CN107208891A (fr)
DE (1) DE102015200778A1 (fr)
WO (1) WO2016116385A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11870222B2 (en) 2021-05-04 2024-01-09 Federal-Mogul Ignition Gmbh Spark plug electrode and method of manufacturing the same
DE102023107904A1 (de) 2022-03-29 2023-10-05 Federal-Mogul Ignition Gmbh Zündkerze, zündkerzenelektrode und verfahren zur herstellung derselben

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8705865U1 (de) * 1987-04-22 1987-09-17 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Glühkerze
US5177037A (en) * 1991-05-21 1993-01-05 Industrial Ceramic Technology, Inc. High fracture toughness electro-discharge machineable ceramic whisker reinforced ceramic composites and tooling made therefrom
JPH09105677A (ja) * 1995-10-12 1997-04-22 Isuzu Ceramics Kenkyusho:Kk セラミックシース型部品及びその製造方法
CN2317327Y (zh) * 1997-11-20 1999-05-05 王正定 火焰预热塞
DE19812785A1 (de) * 1998-03-24 1999-10-07 Beru Ag Schutzrohre für Glüh- und Meßelemente
DE19907229C2 (de) * 1999-02-19 2003-06-12 Beru Ag Stabglühkerze
JP4044244B2 (ja) * 1999-07-30 2008-02-06 京セラ株式会社 窒化ケイ素セラミックヒータ
CN1137330C (zh) * 2000-08-24 2004-02-04 日本特殊陶业株式会社 预热塞和火花塞及其制造方法
US20070221647A1 (en) * 2006-03-23 2007-09-27 Federal-Mogul World Wide, Inc. Multi-layer heating element
DE102008008205A1 (de) * 2008-02-07 2009-08-13 Robert Bosch Gmbh Metallische Glühstiftkerze mit Temperaturmessung
DE102008040339A1 (de) 2008-07-11 2010-01-14 Robert Bosch Gmbh Glührohr, insbesondere für eine Glühstiftkerze

Also Published As

Publication number Publication date
DE102015200778A1 (de) 2016-07-21
WO2016116385A1 (fr) 2016-07-28
CN107208891A (zh) 2017-09-26

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Owner name: ROBERT BOSCH GMBH