EP3201530A1 - Bougie-crayon de préchauffage - Google Patents

Bougie-crayon de préchauffage

Info

Publication number
EP3201530A1
EP3201530A1 EP15766164.6A EP15766164A EP3201530A1 EP 3201530 A1 EP3201530 A1 EP 3201530A1 EP 15766164 A EP15766164 A EP 15766164A EP 3201530 A1 EP3201530 A1 EP 3201530A1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
glow plug
support tube
heating element
housing
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Withdrawn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
EP15766164.6A
Other languages
German (de)
English (en)
Inventor
Eriko TERASAKI
Eberhard Janzen
Gebro GABRIYEL
Albrecht Geissinger
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 EP3201530A1 publication Critical patent/EP3201530A1/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Withdrawn legal-status Critical Current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 invention relates to a glow plug or glow plug, and more particularly a ceramic glow plug for arrangement in a chamber of an internal combustion engine, such as a pre-vortex or combustion chamber of an air-compressing, self-igniting diesel engine.
  • Diesel engines are used compared to gasoline powered ones
  • Glow plugs are used to cold run the engine and its
  • Diesel engine normally each at least one electrically heated
  • Glow plug also known as GLP (English term “glow plug")
  • GLP German term “glow plug”
  • glow plug by means of which the diesel engine is preheated in the starting phase Glow plug can have a heating element made of metal or ceramic, also known as glow plug With
  • the glow plug usually consists of electrically insulating ceramic material in which highly electrically conductive leads and an internal heating conductor can be embedded.
  • the ceramic glow plug also called ceramic pin, is fixed in a support tube and gas-tight pressed into a glow plug. The electrical contact of the positive pole of the ceramic pin, usually by a at one end of the
  • Ceramic pin provided contact point of the heating element is provided by a connecting bolt, which is connected via a wire to the positive terminal of the ceramic ceramic pin, and the electrical contact of the negative terminal of the ceramic pin, that is, the ground connection to the engine block via the support tube of the ceramic pin and the Housing made.
  • the described wire connection of the connecting bolt with the positive pole of the ceramic pin of the known glow plugs is usually carried out by a solder joint.
  • a connection between the connecting bolt and positive pole can also be effected by a pressed or soldered metal sleeve.
  • a connection by means of the soldered wire or by means of the introduced metal sleeve requires a corresponding stabilization, which is usually carried out by introducing and compacting a powder in the support tube, resulting in a complex manufacturing process.
  • the glow plug 9 consists in principle of a connecting pin 91, a heating element in the form of a ceramic pin 92, a rigid metal housing 93 and a plastic sleeve 94.
  • the positive contacting of the ceramic pin 92 takes place here through the connecting pin 91 via a graphite tablet 95 used as an elastic contacting element instead, wherein the positive contact of the ceramic pin 92 and thus also the graphite tablet 95 and the contacting end of the connecting pin 91 within the rigid housing 93 of the glow plug 9, that is in the hollow interior of the housing 93 of the glow plug 9.
  • the ceramic pin 92 is usually made of a more brittle material than the metal housing 93, resulting in excessive stress on the ceramic pin 92, for example, by a force from the side of the ceramic pin 92, which exceeds its strength, usually a breakage of the ceramic pin 92 can lead.
  • the known with glow plugs wire bonding, as described, inter alia, above, therefore requires a complex production, while this must be increasingly soldered, whereby the assembly of the glow plug is difficult and costly. In the known development of a
  • Cylinder head of an internal combustion engine it may happen due to this rigid structure that the ceramic pin 92 is applied by bending careless handling with bending forces, such as snagging the exposed tip of the ceramic pin 92 at the edge of the cylinder head or the like, which can lead to the ceramic pin 92 is not bent but due to its brittleness and the rigid arrangement in the metal housing 93 can easily break off and fall into the combustion chamber.
  • the thus necessary disassembly and reassembly of the cylinder head to remove the broken part of the ceramic pin 92 from the cylinder head leads to a significant delay in the assembly time and the associated undesirable additional costs.
  • an electrically heatable glow plug with the features of claim 1 is proposed, preferably for the cold start aid of a self-igniting internal combustion engine, such as a diesel engine.
  • the invention comprises an electrically heatable glow plug according to the invention with a housing, also referred to as a plug housing, a supporting tube connected to the housing, a held in the support tube ceramic heating element with a positive pole and a negative terminal, and an electrically conductive terminal bolt, which has an electrically conductive Contacting element with the Positive pole of the ceramic heater is in electrical connection.
  • the support tube is usually a tubular member which may be formed either as a separate part or sometimes as part of a housing of the glow plug.
  • the electrically conductive contacting element is compressible and elastic and is arranged between the connecting bolt and the positive pole of the ceramic heating element, wherein at least the positive pole of the ceramic heating element lying outside of the housing are arranged in the support tube.
  • the electrically conductive contacting element is arranged lying outside of the housing in the support tube.
  • the ceramic heating element of the glow plug according to the invention also known as glow plug or ceramic pin, consists in principle of electrically insulating ceramic material, for example silicon nitride, in which electrically highly conductive leads and an internal heating conductor can be embedded, as is known from the prior art discussed above. and control function is combined in the heating element.
  • the positive pole is formed by one end of the heating conductor, which is at a held by the rest of the glow plug end of the ceramic
  • the negative terminal is formed by a compound of the heat conductor to the outer shell of the heating element, which is connected via the support tube and the housing of the glow plug, which are preferably formed of metal, with the engine block as a ground connection.
  • the ceramic heating element has a free end projecting into the combustion chamber of the internal combustion engine and the end forming the positive pole surface, which usually serves as a positive pole for contacting the heating conductor in the heating element. This means that in the glow plug according to the invention, the positive pole of the ceramic heating element, which is located on the in the support tube
  • Contacting element in communicating end of the electrically conductive Connection bolt to be arranged within the housing. Alternatively, however, this may also be arranged lying in the support tube outside the housing, similar to the positive pole of the ceramic heating element and the electrically conductive contacting element.
  • the support tube may be partially within the housing, that is arranged in an inner, at least one side open cavity of the housing of the glow plug, at least the positive pole of the ceramic heater or in addition the associated electrically conductive
  • contacting element are not positioned within the cavity of the housing but are outside the cavity and thus outside of the housing of the glow plug.
  • the support tube may be attached to the housing so that no part of the support tube is disposed within the housing but instead the support tube is a kind of extension of the housing.
  • a so-called safe "flexible design" of the glow plug is provided in which the "short" ceramic heating element is held outside the housing in the support tube, whereby it is made possible that with an excessive load of the ceramic heating element by a force from the side of the ceramic heating element, the support tube, which here has a much lower strength than the ceramic heating element absorbs the force by a plastic deformation, without that ceramic heating element is destroyed. Since the electrically conductive contacting element remains flexible even after compression or decompression, a flexible contact between the connecting pin and the positive pole of the ceramic heating element is created by means of the compressible contacting element.
  • this rear end of the ceramic heating element on which the positive terminal contact surface is located may however also have an end face at an angle of 90 ° to the longitudinal axis of the ceramic heating element, or it may be a cylindrical projection as a projecting one
  • Sheathed plug the part of the support tube located outside of the housing, in which at least the positive pole of the ceramic heating element and the electrically conductive contacting element are arranged, have a lower resistance moment than a part of the support tube located inside the housing.
  • This can preferably be implemented by an equal or smaller wall thickness of the part of the support tube located outside the housing in comparison to the part of the support tube located inside the housing.
  • the part of the support tube located inside the housing preferably has a wall thickness of 0.88 to 1.4 mm, more preferably 0.93 mm, and the part of the support tube outside the housing preferably has a wall thickness of 0.5 to 0, 8mm, more preferably 0.55mm.
  • glow plug of the invention consist of a ductile material
  • the strength of the support tube is chosen so that when a force acting on the ceramic heater bending load, the support tube is deformed, the strength of the ceramic heater is not exceeded and the electrical connection between the positive pole of the ceramic heater and the
  • Connection bolt is maintained by the electrically conductive contacting element. To ensure this it is preferable that the electrically conductive contacting element.
  • the electrically conductive contacting element is not materially connected to the positive pole.
  • the electrically conductive contacting element can preferably be positively connected to the positive pole, more preferably by the electrically conductive contacting element between the positive pole of the ceramic heating element and the corresponding end of the connecting bolt, which is aligned within the housing towards the ceramic heating element, is clamped.
  • the electrically conductive contacting element can accordingly be biased by the connecting bolt.
  • the bias of the electrically conductive contacting element or the connecting bolt must also be held by suitable measures in the region of the support tube or the housing, a variety of solutions are conceivable.
  • the glow plug according to the invention may further comprise a cover component.
  • the lid member may be a gasket forming the cavity of the
  • the lid member may be implemented in the form of an electrically insulating sleeve which additionally electrically insulates and mechanically supports the terminal bolt relative to the housing.
  • the electrically conductive contacting element of the glow plug according to the invention has electrically conductive properties. According to preferred developments of the glow plug according to the invention, the electrically conductive
  • a conductive powder such as a metal powder, in particular a silver powder, a graphite powder or a conductive ceramic powder, always in solidified form, or from a porous sintered body, preferably from the same materials exist.
  • the electrically conductive contacting element may have a
  • the electrically conductive contacting element may consist of a rolled and / or a compressed metal fabric, wherein the metal fabric is preferably metal wool, and wherein the metal should not oxidize.
  • the metal fabric is preferably metal wool, and wherein the metal should not oxidize.
  • examples of such a metal are copper, bronze, brass, steel, stainless steel, silver or nickel. It is also an oxidationsan Struktureres coated, for example, silver-plated or nickel-plated metal fabric used.
  • the electrically conductive contacting element consist of elastic material, preferably based on graphite. Graphite is preferably used as the material for the electrically conductive contacting element. alternative or in addition, however, the use of other suitable electrically conductive materials is possible.
  • Glow plug can be placed inside the support tube between the connecting bolt and the
  • PPS polyphenylene sulfide
  • PEEK polyetheretherketone
  • a glow plug according to the invention has the advantage over the prior art discussed above, due to the use of the flexible, electrically conductive contacting element, that no wires are used for contacting between the connecting bolt and the ceramic heating element of the glow plug, whereby a soldering of wires between these
  • Figure 1 is a schematic sectional view of a glow plug according to a
  • FIG. 2 is a schematic sectional view of a front part of FIG. 1
  • Figure 3 is a schematic sectional view of a glow plug with flexible
  • FIG. 1 shows a schematic sectional view of a glow plug 1 according to a preferred embodiment of the invention
  • FIG. 2 shows a schematic sectional view of a front part of the glow plug 1 according to the present invention shown in FIG.
  • the glow plug 1 consists of a housing 2, an associated support tube 3, a ceramic heating element or glow plug 4, which called a positive pole 41, also called positive contact region, and a negative terminal 42, also referred to as negative contact region 42, an electrically conductive
  • the ceramic heating element 4 with its positive pole 41 and Negative pole 42, the contacting element 6 and a standing with the contacting element 6 in electrical connection end 51 of the connecting bolt 5 are arranged in an insulating sleeve 7, which electrically isolates the contacting element 6 and the end 51 of the connecting bolt 5 with respect to the support tube 3 to a short circuit between positive pole 41 and negative pole 42 to avoid.
  • Contact area 53 is in electrical contact. Furthermore, an insulating disk 82 made of an electrically non-conductive material, preferably plastic, as well as a seal 83 is arranged between circular connector 81 and housing 2 or connecting bolt 5.
  • Combustion tapered hollow cylinder shape in which a wall thickness towards the combustion chamber is also lower.
  • Wall thickness is here pressed into the housing 2 and optionally welded or soldered to this, in order to achieve a firm connection between the housing 2 and support tube 3.
  • the support tube 3 only in the housing. 2
  • FIG. 1 A transition region between support tube 3 and housing 2 is provided in Figure 2 with a dashed line, which marks the transition between these components.
  • the contacting element 6 which is arranged clamped within the support tube 3 between positive pole 41 of the ceramic heating element 4 and the end 51 of the connecting bolt 5, in an overall arrangement outside the housing 2, ie in Figure 2 below the dashed line, and thus in the part of the support tube 3 with a tapered diameter and thin wall thickness of 0.5 to 0.8 mm, more precisely 0.55 mm, compared to that located within the housing 2 Part of the support tube 3 with a wall thickness of 0.88 to
  • the contacting element 6 For as long as possible continuous maintenance of the electrical contact between positive terminal 41 and terminal pin 5, more specifically between positive terminal 41 and end 51st of the connecting bolt 5, the contacting element 6 must be under tension, wherein the contacting element 6 is elastic in the preferred embodiment for this purpose.
  • the connecting bolt 5 When mounting the glow plug 1 according to the invention, the connecting bolt 5 is pressed into the support tube 3, so that the contacting element 6 is biased.
  • the contacting element 6 With such an arrangement of the contacting element 6 within the support tube 3 outside the housing 2, it is possible that one in Figures 1 and 2 from the side of the ceramic heating element 4 or on the
  • Supporting tube 3 acting compressive force which may occur, for example, by a careless installation of the glow plug 1 in a diesel engine, is intercepted by the fact that the support tube 3 plastically deformed without breaking off or tearing.
  • the support tube 3 consists for this purpose of a ductile material whose strength and geometry is set so that when a lateral load of the heating element 4, the yield strength is exceeded first, but not the

Landscapes

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

Abstract

L'invention concerne une bougie-crayon de préchauffage (1) pouvant être chauffée électriquement, qui comprend un boîtier (2), un tube d'appui (3) relié au boîtier (2), un élément chauffant (4) en céramique maintenu dans le tube d'appui (3) et doté d'un pôle positif (41) et d'un pôle négatif (42), un boulon de raccordement (5) électriquement conducteur, qui est en liaison électrique avec le pôle négatif (41) de l'élément chauffant (4) en céramique par le biais d'un élément de contact (6) électriquement conducteur. L'élément de contact (6) électriquement conducteur peut être comprimé et il est disposé entre le boulon de raccordement (5) et le pôle positif (41) de l'élément chauffant (4) en céramique. Au moins le pôle positif (41) de l'élément chauffant (4) en céramique et éventuellement en plus l'élément de contact (6) sont disposés hors du boîtier (2) couchés dans le tube d'appui (3).
EP15766164.6A 2014-10-02 2015-09-21 Bougie-crayon de préchauffage Withdrawn EP3201530A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220036.9A DE102014220036A1 (de) 2014-10-02 2014-10-02 Glühstiftkerze
PCT/EP2015/071549 WO2016050541A1 (fr) 2014-10-02 2015-09-21 Bougie-crayon de préchauffage

Publications (1)

Publication Number Publication Date
EP3201530A1 true EP3201530A1 (fr) 2017-08-09

Family

ID=54147211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15766164.6A Withdrawn EP3201530A1 (fr) 2014-10-02 2015-09-21 Bougie-crayon de préchauffage

Country Status (4)

Country Link
EP (1) EP3201530A1 (fr)
JP (1) JP6405039B2 (fr)
DE (1) DE102014220036A1 (fr)
WO (1) WO2016050541A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017061439A (ja) * 2015-09-25 2017-03-30 株式会社Kri 界面活性シランカップリング剤
DE102016121346B4 (de) * 2016-10-27 2018-05-09 Borgwarner Ludwigsburg Gmbh Glühkerze
DE102018108427B3 (de) 2018-04-10 2019-07-25 Borgwarner Ludwigsburg Gmbh Heizstab für eine Glühkerze sowie Verfahren zur Herstellung eines Heizstabs und Glühkerze
DE102018214281B3 (de) 2018-08-23 2019-08-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Einrichtung zum Zünden eines Kraftstoff-Oxidationsmittelgemisches

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6660970B1 (en) * 1999-08-27 2003-12-09 Robert Bosch Gmbh Ceramic sheathed element glow plug

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
DE10154641A1 (de) * 2001-11-07 2003-05-22 Bosch Gmbh Robert Elektronisch beheizbare Glühkerze und Verfahren zur Herstellung einer elektrisch beheizbaren Glühkerze
JP2003185137A (ja) * 2001-12-18 2003-07-03 Bosch Automotive Systems Corp ディーゼルエンジン用グロープラグおよびその製造方法
DE10339641A1 (de) 2003-08-28 2005-03-24 Robert Bosch Gmbh Glühstiftkerze mit besonders eingebettetem Kontaktelement
JP4172486B2 (ja) * 2003-12-19 2008-10-29 ボッシュ株式会社 セラミックスヒータ型グロープラグ
JP2005180855A (ja) * 2003-12-22 2005-07-07 Bosch Automotive Systems Corp セラミックスヒータ型グロープラグ
KR100915576B1 (ko) * 2004-05-27 2009-09-07 쿄세라 코포레이션 세라믹 히터 및 그것을 사용한 글로우 플러그
DE102006062215A1 (de) * 2006-12-22 2008-06-26 Robert Bosch Gmbh Glühstiftkerze
US20100078421A1 (en) * 2008-10-01 2010-04-01 Federal-Mogul Italy Sr1 Glow plug adn heater assembly therefor with an improved connection between a central electrode and a heater probe of the heater assembly
JP2011017478A (ja) * 2009-07-08 2011-01-27 Ngk Spark Plug Co Ltd グロープラグ
DE102009045273A1 (de) * 2009-10-02 2011-04-07 Robert Bosch Gmbh Verfahren zum Herstellen einer Glühkerze
WO2013001883A1 (fr) * 2011-06-29 2013-01-03 ボッシュ株式会社 Bougie de préchauffage de type à élément chauffant céramique
JP2014219107A (ja) * 2011-09-07 2014-11-20 ボッシュ株式会社 セラミックスヒータ型グロープラグ
EP2725298B1 (fr) * 2012-10-26 2017-11-22 SIEVA d.o.o., PE Spodnja Idrija Procédé de fabrication d'une bougie de préchauffage à bimatériau

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6660970B1 (en) * 1999-08-27 2003-12-09 Robert Bosch Gmbh Ceramic sheathed element glow plug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2016050541A1 *

Also Published As

Publication number Publication date
DE102014220036A1 (de) 2016-04-07
WO2016050541A1 (fr) 2016-04-07
JP6405039B2 (ja) 2018-10-17
JP2017527769A (ja) 2017-09-21

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