EP3014185B1 - Bougie de préchauffage - Google Patents

Bougie de préchauffage Download PDF

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Publication number
EP3014185B1
EP3014185B1 EP14734764.5A EP14734764A EP3014185B1 EP 3014185 B1 EP3014185 B1 EP 3014185B1 EP 14734764 A EP14734764 A EP 14734764A EP 3014185 B1 EP3014185 B1 EP 3014185B1
Authority
EP
European Patent Office
Prior art keywords
glow plug
contact
ceramic heating
heating pin
connecting bolt
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.)
Active
Application number
EP14734764.5A
Other languages
German (de)
English (en)
Other versions
EP3014185A1 (fr
Inventor
Hans-Juergen Brix
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 EP3014185A1 publication Critical patent/EP3014185A1/fr
Application granted granted Critical
Publication of EP3014185B1 publication Critical patent/EP3014185B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention relates to a glow plug for an internal combustion engine.
  • glow plugs with a ceramic heating pin are already known. So revealed the EP 1 707 883 A1 a glow plug with a ceramic heating pin, and a connecting bolt, wherein the electrical contact between the connecting bolt and the ceramic heating pin via an electrically conductive wire.
  • the electrically conductive wire is embedded in an insulating powder to avoid a short circuit due to contact of the electrically conductive wire with the housing.
  • an insulating powder is filled in the housing, which isolates the electrically conductive wire relative to the housing and causes a mechanical stabilization of the wire against vibrations.
  • the EP 2 306 089 A2 also discloses a glow plug with a ceramic heating pin and a connecting bolt, wherein the electrical contact between the terminal bolt and the ceramic heating pin via a contact element.
  • the glow plug according to the invention with the features of claim 1 offers the advantage that it allows a simplified contacting a ceramic glow pin, which can be produced easily and inexpensively waiving an insulating filler powder. Furthermore, the glow plug according to the invention is more robust against thermal and mechanical stress, since the connection via the contact element is more stable than the known wire connection. Due to the robust and rigid electrical connection between the connecting bolt and the ceramic heating pin, the filling of the housing of the glow plug with an insulating powder can be omitted, which saves at least one process step and thus significantly costs in the production and possibly accelerates the manufacturing process.
  • the second electrical contacting point By arranging the second electrical contacting point on a circumferential surface of the ceramic heating pin in combination with an axially displaceable electrical contacting of the contact element on the ceramic heating pin, a sliding contact of the contact element is formed at the second contacting point, whereby a length compensation by different thermal expansion of connecting bolt and ceramic heating pin allows becomes. Furthermore, no transverse forces acting on the contact element, so that even with a thermal relaxation during operation of the glow plug no lifting or bending away of the contact element is to be feared by the second electrical contact point. Thus, a permanently secure electrical contact of the ceramic heating pin is guaranteed.
  • the ceramic heating pin has a connection-side, the connecting bolt facing portion which has a reduced diameter compared to the remaining ceramic glow plug.
  • reducing the diameter in this section is provided radially to the section space in the housing, so that increases the distance between the section and a housing wall or arranged in the housing support tube. The greater distance results in a more space for the lateral contacting of the second electrical contact point on the peripheral surface of the ceramic heating pin, and on the other hand, the increased distance from the risk of electrical short circuit or sparking between the contact element and the support tube and / or reduced the housing.
  • the connecting bolt has a bore in which the contact element is fixed.
  • a hole is a simple and secure way to fix the contact element to the terminal bolt. It is particularly advantageous if the bore is centrally placed in a ceramic heating pin facing end face of the connecting bolt. Since the connecting bolt and the ceramic heating pin are arranged centrally and coaxially in the housing of the glow plug, the contact element can be fixed in any end position in the bore of the connecting bolt, whereby the assembly is simplified.
  • the contact element is screwed into the bore.
  • connection conductor is electrically conductively connected to a pin-shaped section in the bore of the connection bolt. This allows a secure, electrical connection between the connecting bolt and contact element can be realized.
  • the contact element has a contact sleeve and a connection conductor.
  • An advantageous development of the invention consists in that the contact element has a radially resilient contact sleeve and a connecting conductor. While the terminal conductor should be designed as stiff as possible to ensure precise fixation on the terminal bolt, the contact sleeve may be thinner and more flexible to allow better axial displacement with appropriate bias against the ceramic heating pin. By the radially resilient contact sleeve a secure sliding contact between the Kotaktelement and the second contacting point is made at the connection side portion of the heating pin.
  • the contact sleeve is centered by the ceramic heating pin, in particular by the connection-side section, so that a certain flexibility must be maintained in the contact element to compensate for any offsets due to assembly, mechanical forces during operation and / or different thermal expansions of the components.
  • the contact sleeve of the contact element receives the ceramic heating pin, in particular the connection-side section with the second contacting point.
  • the contact sleeve is slotted in the axial direction.
  • an axial slit creates an axially displaceable clamping contact between the terminal-side portion of the ceramic heating pin and the contact element in the nature of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
  • a preferably circumferential recess can be formed on the connecting bolt. Due to the peripheral recess, the insulating support element, which is also described below, but also sealing elements can be positioned in a form-fitting manner on the connection bolt.
  • a support tube may be arranged between the housing and the ceramic heating pin, the support tube extending coaxially with the housing on the inside up to at least the level of the connecting bolt, and wherein an insulating support element is arranged between the support tube and the connecting bolt. Due to the insulating support element, the connecting bolt is fixed to the housing in the housing. Furthermore, the insulating support element ensures electrical insulation between the connecting bolt and the housing, which is a prerequisite for the abandonment of an insulating powder filled in the housing.
  • an insulating support element may be arranged between the housing and the connecting bolt. This allows a glow plug according to the invention, which does not require a support tube, whereby the number of components is reduced.
  • a bead may be formed, wherein the bead presses the insulating support member against the terminal bolt.
  • the insulating support member is at least partially positively fixed at its radially outer lateral surface, which inhibits slipping of the insulating support member. It is particularly advantageous if the bead is formed on the support tube at the same height as the recess on the connecting bolt. Thus, a simple and secure fixation of the insulating support member is possible.
  • the connecting bolt can be formed in a non-inventive embodiment, a support surface which is supported on the insulating support member.
  • a support surface which is supported on the insulating support member.
  • Fig. 1 the combustion chamber side portion of a glow plug according to the invention is shown.
  • the glow plug has a housing 1, in which a connecting bolt 4 is arranged.
  • the glow plug also has a ceramic heating pin 2, which is arranged concentrically to the connecting bolt 4 in extension of a central axis of the glow plug. In this case, a combustion chamber-side tip of the ceramic heating pin 2 protrudes beyond the housing 1.
  • a support tube 3 is arranged, which is non-positively, positively and / or materially connected to the housing 1 and the ceramic heating pin 2.
  • the connecting bolt 4 has at its the ceramic heating pin 2 facing end face a bore 9, in which a contact element 8 is fixed.
  • the contact element 8 can be used in the bore 9 by means of soldering, welding or crimping electrically conductive. But it is also conceivable to screw the contact element 8 in the bore 9.
  • a first electrical contacting point 6 is present, which is electrically conductively connected via the support tube 3 to the housing 1 and serves for electrical connection to the negative pole. Furthermore, a connection-side section 5 is formed on the ceramic heating pin 2, wherein an end face of the connection-side section 5 is aligned in the direction of the connection pin 4. The connection-side section 5 has, for electrical connection to the positive pole, a second electrical contacting point 7, which lies on a peripheral surface of the connection-side section 5.
  • connection-side section 5 with the second electrical contacting point 7 is designed as a cylindrical extension of the ceramic heating pin 2 and has a reduced diameter compared with the remaining ceramic heating pin 2.
  • This embodiment is advantageous when the ceramic heating pin 2 is received in the support tube 3 in order to carry out a corresponding radial distance between the second electrical contacting point 7 and an inner wall of the support tube 3.
  • the contact element 8 is provided, which is connected at one end with a radially resilient portion axially displaceable on the connection-side section 5 with the second contact point 7 and at the other end fixed to the terminal bolt 4.
  • the radially resilient portion of the contact element 8 forms on the connection-side section 5 of the heating pin 2 from a sliding contact.
  • an electrically insulating support member 12 is arranged, which is fixed in the support tube 3. The fixation is carried out by means of a introduced in the support tube 3, circumferential bead 13 which presses in the elastically or plastically deformable support member 12.
  • the connecting bolt 4 is fixed to the housing within the support tube 3.
  • the contact element 8 has a radially resilient contact sleeve 8.1, which forms the radially resilient portion, and a substantially rigid terminal conductor 8.2.
  • the connecting conductor 8.2 is bent, so that an electrical conductor from the diameter of the contact sleeve 8.1 towards the bore 9 of the connecting bolt 4 is formed.
  • the connecting conductor 8.2 is inserted with a pin-shaped portion in the introduced at the ceramic heating pin 2 end face of the connecting bolt 4 bore 9, for example by means of soldering, welding or crimping electrically conductive.
  • the contact sleeve 8.1 is slotted in the axial direction, so that a radially resilient bias can be applied.
  • the contact sleeve 8.1 forms an axially displaceable clamping contact on the connection-side section 5 with the second electrical contacting point 7 in the manner of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
  • Fig. 2 another glow plug not according to the invention is disclosed. For the most part the same construction will be discussed below only on the differences.
  • the glow plug according to Fig. 2 dispenses with a support tube 3. Accordingly the first contacting point 6 of the ceramic heating pin 2 is connected directly to the housing 1. The electrical contacting of the negative pole thus takes place directly via the first contacting point 6 on the ceramic heating pin 2 and the housing 1. This results between ceramic heating pin 2 and housing, in particular in the region of the connection-side section 5 with the second electrical contacting 7 more space, so that can be dispensed with a diameter reduction of the ceramic heating pin 2 on the connection-side section 5. Further, a collar 11 is formed on the terminal bolt 4, which is supported on a heating pin side support surface on the insulating support member 12.
  • the insulating support member 12 is disposed between the housing 1 and the terminal bolt 4, wherein the bead 13 is formed for fixing the insulating support member 12 on the housing 1 and produces an at least partially positive connection.
  • About the collar 11 and the support surface of the connecting bolt 4 is locked by means of the housing-fixed, insulating support member 12 in the axial direction.
  • the insulating support member 12 may be bonded to the support tube 3 or to the housing 1 for fixing, wherein the shown, at least partially positive connection via the bead 13 is preferred.

Claims (6)

  1. Bougie de préchauffage pour moteur à combustion interne, présentant :
    un boîtier (1) dans lequel est isposé un goujon de raccordement (4) et
    une tige chauffante (2) en céramique,
    la tige chauffante (2) en céramique présentant un premier emplacement (6) de mise en contact électrique et un deuxième emplacement (7) de mise en contact électrique,
    le premier emplacement (6) de mise en contact électrique de la tige chauffante (2) étant relié au moins indirectement au boîtier (1) de la bougie de préchauffage et le deuxième emplacement (7) de mise en contact électrique étant relié électriquement au goujon de raccordement (4) par l'intermédiaire d'un élément de contact (8),
    le deuxième emplacement (7) de mise en contact électrique étant formé sur une surface périphérique d'une partie (5) côté raccordement de la tige chauffante (2) en céramique,
    le diamètre de la partie (5) côté raccordement étant plus petit que celui du reste de la tige chauffante (2) en céramique,
    l'élément de contact (8) présentant une partie qui établit à la surface préiphérique de la partie (5) côté raccordement un contact électrique coulissant axialement avec le deuxième emplacement (7) de mise en contact électrique,
    caractérisée en ce que
    l'élément de contact (8) présente une douille de contact (8.1) et un conducteur de raccordement (8.2),
    en ce que le goujon de raccordement (4) présente un alésage (9) dans lequel est fixé l'élément de contact (8) et
    en ce que le conducteur de raccordement (8.2) est relié de manière électriquement conductrice à une partie en forme de tige dans l'alésage (9) du goujon de raccordement (4).
  2. Bougie de préchauffage selon la revendication 1, caractérisée en ce que l'élément de contact (8) est vissé dans l'alésage (9).
  3. Bougie de préchauffage selon l'une des revendications précédentes, caractérisée en ce que le conducteur de raccordement (8.2) a une forme incurvée.
  4. Bougie de préchauffage selon l'une des revendications précédentes, caractérisée en ce que l'alésage (9) est placé au centre d'un côté frontal du goujon de raccordement (4), tourné vers la tige chauffante (2) en céramique.
  5. Bougie de préchauffage selon l'une des revendications précédentes, caractérisée en ce que la douille de contact (8.1) est radialement élastique et peut coulisser axialement sur la partie (5) côté raccordement pour former un contact coulissant sur le deuxième emplacement (7) de mise en contact électrique.
  6. Bougie de préchauffage selon l'une des revendications précédentes, caractérisée en ce que la douille de contact (8.1) est fendue dans la direction radiale.
EP14734764.5A 2013-06-26 2014-06-18 Bougie de préchauffage Active EP3014185B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212260.8A DE102013212260A1 (de) 2013-06-26 2013-06-26 Glühstiftkerze
PCT/EP2014/062876 WO2014206845A1 (fr) 2013-06-26 2014-06-18 Bougie de préchauffage

Publications (2)

Publication Number Publication Date
EP3014185A1 EP3014185A1 (fr) 2016-05-04
EP3014185B1 true EP3014185B1 (fr) 2019-02-20

Family

ID=51062786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14734764.5A Active EP3014185B1 (fr) 2013-06-26 2014-06-18 Bougie de préchauffage

Country Status (4)

Country Link
EP (1) EP3014185B1 (fr)
JP (1) JP6111379B2 (fr)
DE (1) DE102013212260A1 (fr)
WO (1) WO2014206845A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019004286A1 (fr) * 2017-06-28 2019-01-03 京セラ株式会社 Appareil de chauffage

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
US4661686A (en) * 1984-04-12 1987-04-28 Ngk Spark Plug Co., Ltd Dual line ceramic glow plug
JP4672910B2 (ja) * 2001-06-07 2011-04-20 日本特殊陶業株式会社 グロープラグの製造方法
JP4677140B2 (ja) * 2001-08-13 2011-04-27 日本特殊陶業株式会社 グロープラグ
JP2003130349A (ja) * 2001-10-24 2003-05-08 Denso Corp グロープラグ
KR100767937B1 (ko) 2003-12-19 2007-10-17 봇슈 가부시키가이샤 세라믹 히터형 글로 플러그
JP4348317B2 (ja) * 2004-06-29 2009-10-21 日本特殊陶業株式会社 グロープラグ
JP4996283B2 (ja) * 2006-05-18 2012-08-08 日本特殊陶業株式会社 セラミックヒータ及びグロープラグ
JP5324905B2 (ja) * 2008-12-11 2013-10-23 日本特殊陶業株式会社 グロープラグ
JP2011017478A (ja) * 2009-07-08 2011-01-27 Ngk Spark Plug Co Ltd グロープラグ
JP4851570B2 (ja) * 2009-09-09 2012-01-11 日本特殊陶業株式会社 グロープラグ
DE102009048643B4 (de) * 2009-09-30 2013-11-28 Borgwarner Beru Systems Gmbh Glühkerze und Verfahren zum Verbinden eines Stifts aus einer Funktionskeramik mit einer Metallhülse
JP5552920B2 (ja) * 2010-06-25 2014-07-16 株式会社デンソー セラミックヒータ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JP2016525202A (ja) 2016-08-22
JP6111379B2 (ja) 2017-04-05
EP3014185A1 (fr) 2016-05-04
WO2014206845A1 (fr) 2014-12-31
DE102013212260A1 (de) 2014-12-31

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