WO2014206845A1 - Bougie de préchauffage - Google Patents

Bougie de préchauffage Download PDF

Info

Publication number
WO2014206845A1
WO2014206845A1 PCT/EP2014/062876 EP2014062876W WO2014206845A1 WO 2014206845 A1 WO2014206845 A1 WO 2014206845A1 EP 2014062876 W EP2014062876 W EP 2014062876W WO 2014206845 A1 WO2014206845 A1 WO 2014206845A1
Authority
WO
WIPO (PCT)
Prior art keywords
glow plug
connecting bolt
plug according
housing
ceramic heating
Prior art date
Application number
PCT/EP2014/062876
Other languages
German (de)
English (en)
Inventor
Hans-Juergen Brix
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
Priority to EP14734764.5A priority Critical patent/EP3014185B1/fr
Priority to JP2016520473A priority patent/JP6111379B2/ja
Publication of WO2014206845A1 publication Critical patent/WO2014206845A1/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

Definitions

  • the present invention relates to a glow plug for an internal combustion engine. State of the art
  • EP 1 707 883 A1 discloses 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 takes place 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 thereby causes a mechanical stabilization of the wire against vibration.
  • the glow plug according to the invention offers the advantage that it allows a simplified contacting of 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 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.
  • a further advantageous development of the invention consists in that 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 arranged centrally and coaxially in the housing of the glow plug are, the contact element can be screwed in any end position, whereby the assembly is simplified.
  • the contact element has a radially resilient contact sleeve and a connection 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. In addition, 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. It is particularly advantageous if the connection conductor is electrically conductively connected to a pin-shaped portion in the bore of the connecting bolt. This allows a secure, electrical connection between the connecting bolt and contact element can be realized.
  • 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 further advantageous development is that a preferably circumferential recess is formed on the connecting bolt. Due to the fende depression, the insulating support element described below, but also sealing elements can be positively positioned on the connecting bolt.
  • a further advantageous development consists in that a support tube is arranged between the housing and the ceramic heating pin, wherein the support tube extends coaxially with the housing on the inside 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 is arranged between the housing and the connection 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 is formed on the support tube or on the housing, 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.
  • the bead is formed on the support tube or on the housing at the same height as the recess on the connecting bolt. Thus, a simple and secure fixation of the insulating support member is possible.
  • a further advantageous development is that a support surface is formed on the connecting bolt, which is supported on the insulating support member.
  • Fig. 1 shows a first embodiment of a glow plug according to the invention with a ceramic heating pin.
  • Fig. 2 shows another embodiment of a glow plug according to the invention.
  • FIGS. 3 a and 3b show an exemplary embodiment of the contact element from the exemplary embodiments according to FIG. 1 or FIG. 2.
  • 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 in the bore 9 by means of soldering, welding or crimping elec- be used 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 For electrical contacting of the second electrical contact point 7 with the terminal bolt 4, the contact element 8 is provided, which at one end with a radially resilient portion axially slidably connected on the connection-side section 5 with the second contact point 7 and at the other end fixed to the terminal bolt 4 is.
  • 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. By means of the sliding contact length changes due to different thermal expansions are compensated.
  • 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 section, and a substantially rigid connection 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. Due to the radial prestress, the contact sleeve 8.1 forms an axially displaceable clamping contact on the connection-side section 5 with the second electrical contact-making 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 an alternative embodiment of a glow plug according to the invention is disclosed.
  • the exemplary embodiment 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.
  • a collar 11 is formed on the connecting 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.

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 de préchauffage, destinée à un moteur à combustion interne, qui comporte un boîtier (1) dans lequel un boulon de raccordement (4) est disposé, ainsi qu'une bougie en céramique (2) qui possède un premier point de contact électrique (6) et un second point de contact électrique (7). Le premier point de contact électrique (6) de la bougie (2) est relié au moins indirectement au boîtier (1) de la bougie de préchauffage. Le second point de contact électrique (7) est relié électriquement au boulon de raccordement (4) par le biais d'un élément de contact (8). Le second point de contact électrique (7) est réalisé sur une surface circonférentielle d'un segment (5) côté raccordement de la bougie en céramique (2). L'élément de contact (8) possède un segment qui réalise sur la surface circonférentielle du segment (5) côté raccordement un contact électrique déplaçable axialement avec le second point de contact électrique (7).
PCT/EP2014/062876 2013-06-26 2014-06-18 Bougie de préchauffage WO2014206845A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14734764.5A EP3014185B1 (fr) 2013-06-26 2014-06-18 Bougie de préchauffage
JP2016520473A JP6111379B2 (ja) 2013-06-26 2014-06-18 グロープラグ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212260.8 2013-06-26
DE102013212260.8A DE102013212260A1 (de) 2013-06-26 2013-06-26 Glühstiftkerze

Publications (1)

Publication Number Publication Date
WO2014206845A1 true WO2014206845A1 (fr) 2014-12-31

Family

ID=51062786

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/062876 WO2014206845A1 (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

Citations (6)

* 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
DE10249408A1 (de) * 2001-10-24 2003-06-05 Denso Corp Glühkerze für Dieselmotor und entsprechendes Herstellungsverfahren
JP2010139152A (ja) * 2008-12-11 2010-06-24 Ngk Spark Plug Co Ltd 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
EP2306089A2 (fr) * 2009-09-30 2011-04-06 BorgWarner BERU Systems GmbH Bougie de préchauffage destinée à relier une pointe en céramique avec une enveloppe métallique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
JP4851570B2 (ja) * 2009-09-09 2012-01-11 日本特殊陶業株式会社 グロープラグ
JP5552920B2 (ja) * 2010-06-25 2014-07-16 株式会社デンソー セラミックヒータ

Patent Citations (6)

* 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
DE10249408A1 (de) * 2001-10-24 2003-06-05 Denso Corp Glühkerze für Dieselmotor und entsprechendes Herstellungsverfahren
JP2010139152A (ja) * 2008-12-11 2010-06-24 Ngk Spark Plug Co Ltd 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
EP2306089A2 (fr) * 2009-09-30 2011-04-06 BorgWarner BERU Systems GmbH Bougie de préchauffage destinée à relier une pointe en céramique avec une enveloppe métallique

Also Published As

Publication number Publication date
EP3014185A1 (fr) 2016-05-04
DE102013212260A1 (de) 2014-12-31
JP2016525202A (ja) 2016-08-22
EP3014185B1 (fr) 2019-02-20
JP6111379B2 (ja) 2017-04-05

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