[go: up one dir, main page]

WO2014073267A1 - Bougie à incandescence du type à élément chauffant en céramique - Google Patents

Bougie à incandescence du type à élément chauffant en céramique Download PDF

Info

Publication number
WO2014073267A1
WO2014073267A1 PCT/JP2013/074634 JP2013074634W WO2014073267A1 WO 2014073267 A1 WO2014073267 A1 WO 2014073267A1 JP 2013074634 W JP2013074634 W JP 2013074634W WO 2014073267 A1 WO2014073267 A1 WO 2014073267A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic heater
glow plug
lead portion
diameter lead
electrode
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.)
Ceased
Application number
PCT/JP2013/074634
Other languages
English (en)
Japanese (ja)
Inventor
勝美 高津
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.)
Bosch Corp
Original Assignee
Bosch Corp
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 Bosch Corp filed Critical Bosch Corp
Priority to JP2014545600A priority Critical patent/JPWO2014073267A1/ja
Publication of WO2014073267A1 publication Critical patent/WO2014073267A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/027—Heaters specially adapted for glow plug igniters

Definitions

  • the present invention relates to a ceramic heater type glow plug used as a starting aid for a diesel engine.
  • the present invention relates to a ceramic heater type glow plug that can be configured to have a relatively short overall length.
  • Ceramic heater type glow plugs used as a starting aid for diesel engines generally have a structure in which the heat generating part on the front end side of the ceramic heater protrudes outside and the rear end side is held in a metal outer cylinder. Have. In such a ceramic heater type glow plug, the rear end side of the metal outer cylinder is inserted and fixed into the front end portion of a cylindrical housing which is a fitting for mounting on the cylinder head of the engine.
  • one electrode (negative electrode) 133 of the ceramic heater 121 is taken out to the outer surface of the ceramic insulating base 139 as shown in FIG.
  • the other electrode (positive electrode) 131 is connected to the outside of the metal outer cylinder 125 from the rear end side via the electrode extraction fitting 123 and the electrode extraction rod 127.
  • a ceramic heater type glow plug 110 configured so as to be taken out is put into practical use.
  • the electrode extracted to the outside of the metal outer cylinder 125 by the electrode extraction fitting 123 and the electrode extraction rod 127 is external connection terminal 115 fixed to the rear end side of the housing 111 via an insulating member. (See, for example, Patent Document 1).
  • the temperature of the electrode extraction fitting 123 is set to a heat resistant temperature. There is a risk of greatly exceeding. Therefore, the inside of the metal outer cylinder 125 is filled with insulating ceramic powder 129, and the heat of the electrode extraction fitting 123 is radiated through the ceramic powder 129 to suppress the temperature rise of the electrode extraction fitting 123. .
  • an object of the present invention is to provide a ceramic heater type glow plug whose configuration and manufacturing process are simplified as compared with the conventional one.
  • a ceramic heater type glow plug comprising: a ceramic heater; and a metal outer cylinder in which the ceramic heater is held on one end side and the other end side is inserted and fixed in the inner hole of the housing.
  • the ceramic heater has one electrode of the ceramic heater on the outer peripheral surface, the other electrode at the rear end of the ceramic heater, and the other electrode is connected to an external connection terminal through a large-diameter lead portion.
  • the ceramic heater type glow plug of the present invention since the other electrode of the ceramic heater is connected to the external connection terminal using the large-diameter lead portion, the resistance of the large-diameter lead portion is reduced. It is possible to prevent the temperature of the large-diameter lead portion from exceeding the heat resistant temperature while simplifying the configuration.
  • the ceramic heater type glow plug of the present invention employs a large-diameter lead portion, so that the configuration of other constituent members can be simplified, and the manufacturing process can be simplified.
  • the rigidity of the large-diameter lead portion is lower than that of the external connection terminal.
  • the large lead portion is made of Cu, Cu alloy, Al, Al alloy, or cast iron.
  • the large-diameter lead portion made of such a material a large-diameter lead portion having relatively low rigidity can be obtained.
  • the other electrode and the leading end portion of the large-diameter lead portion are joined inside the metal outer cylinder, and the rear end portion of the large-diameter lead portion Is preferably joined to the external connection terminal outside the metal outer cylinder.
  • the axial sectional area of the ceramic heater when the axial sectional area of the ceramic heater is 1.0, the axial sectional area of the large-diameter lead portion is 0.2 to 0.4. It is preferable to set the value within the range.
  • the ceramic heater type glow plug of the present invention it is preferable to provide a tapered portion around the joint portion between the other electrode and the large-diameter lead portion at the rear end portion of the ceramic heater. By providing such a tapered portion at the rear end portion of the ceramic heater, it is possible to improve the electrical insulation of the joint portion between the large diameter lead portion and the electrode.
  • the ceramic heater type glow plug of the present invention it is preferable to cover the periphery of the large-diameter lead portion with an electrically insulating material. By providing such an electrical insulating material, electrical insulation between the large-diameter lead portion and the metal outer cylinder can be ensured.
  • a recess is provided on the rear end surface of the ceramic heater, the other electrode is provided in the recess, and the tip of the large-diameter lead portion is provided in the recess.
  • FIG. 1 is an axial sectional view of a glow plug according to a first embodiment of the present invention. It is an axial sectional view of a ceramic heater assembly of a glow plug according to a second embodiment of the present invention. It is an axial sectional view of a ceramic heater assembly of a glow plug according to a third embodiment of the present invention. It is an axial sectional view of a ceramic heater assembly of a glow plug according to a fourth embodiment of the present invention. It is a figure shown in order to demonstrate the structure of the conventional glow plug.
  • FIG. 1 is an axial cross-sectional view of a diesel engine glow plug 10 according to a first embodiment of the present invention.
  • a glow plug 10 shown in FIG. 1 is configured as a ceramic heater type glow plug including a ceramic heater assembly 20.
  • the ceramic heater assembly 20 includes a ceramic heater 21, a metal outer cylinder (sheath) 25, a large-diameter lead portion 40, and the like as main components.
  • the ceramic heater 21 has a U-shaped ceramic heating element 37 embedded in a ceramic insulating base 39 constituting the main body.
  • a positive electrode 31 and a negative electrode 33 are provided on both ends of the ceramic heating element 37 via metal leads 35, respectively.
  • the negative electrode 33 is taken out on the outer peripheral surface of the ceramic insulating substrate 39, and the negative electrode side metallized portion 24 is formed on the outer peripheral surface of the ceramic insulating substrate 39 including the negative electrode 33.
  • the negative electrode side metallized portion 24 is joined to the inner surface of the metal outer cylinder 25 by brazing or the like, and the negative electrode 33 is electrically connected to the metal outer cylinder 25.
  • the positive electrode 31 is taken out to the outer surface of the ceramic insulating base 39 at the rear end portion opposite to the front end side where the ceramic heating element 37 is embedded.
  • a positive side metallized portion 23 is formed on the rear end face of the ceramic insulating base 39 including the positive side electrode 31.
  • the positive side metallized portion 23 is joined to the distal end surface of the large diameter lead portion 40 by brazing or the like, and the positive side electrode 31 and the large diameter lead portion 40 are electrically connected.
  • the ceramic heater assembly 20 configured in this manner is press-fitted into a cylindrical housing 11 which is a mounting bracket to a cylinder head of an engine (not shown), and is fixed by brazing or the like.
  • the metal outer cylinder 25 is fixed to the inside of the housing 11 by brazing or the like, but the metal outer cylinder 25 is fixed to the inside of a metal pipe or the like by brazing or the like. It is also possible to form the housing 11 integrally by welding the members constituting the housing body.
  • the rear end surface of the large-diameter lead portion 40 is joined and electrically connected to the front end surface of the external connection terminal 15 by welding or the like.
  • the external connection terminal 15 is held by the insulator 12 at the rear end portion of the housing 11, and the rear end portion is exposed to the outside of the housing 11 and connected to the round pin 14.
  • the large-diameter lead portion 40 provided in the glow plug 10 of the present embodiment is, for example, a lead rod having a relatively large diameter having a cross-sectional area of 20% or more of the cross-sectional area of the ceramic insulating base 39. Defined.
  • a high temperature and a large current for example, 4 to 30 amperes
  • flow through the large diameter lead portion 40 if the diameter of the large diameter lead portion 40 is too small, for example, less than 1 mm, There is a risk of oxidation in a short time due to heat generation.
  • the cross-sectional area of the large-diameter lead portion 40 is 20% or more of the cross-sectional area of the ceramic insulating base 39, the area of the joint portion between the rear end surface of the ceramic heater 21 and the front end surface of the large-diameter lead portion 40. Can be ensured greatly, and the bonding strength can be ensured. That is, it is possible to obtain a bonding strength that can withstand vibrations that occur when used while being fixed to a vehicle engine or the like, and stress that is applied when the glow plug 10 is manufactured.
  • the cross-sectional area of the large-diameter lead portion 40 is preferably 70% or less of the cross-sectional area of the ceramic insulating base 39, for example.
  • the cross-sectional area of the large-diameter lead portion 40 is more preferably 50% or less, and further preferably 40% or less of the cross-sectional area of the ceramic insulating base 39.
  • the large-diameter lead portion 40 is made of a material having lower rigidity than the lead rod as the external connection terminal 15. Examples of such a material include copper (Cu), aluminum (Al), and alloys thereof. Alternatively, a low-rigidity iron alloy or cast iron can be used. If the large-diameter lead portion 40 having relatively small rigidity is used as described above, the ceramic heater 21 and the large-diameter lead portion 40 are caused by vibration applied when the engine is driven or stress applied to the periphery of each joint portion when the glow plug 10 is assembled. Even when a bending stress is generated at the joint portion, the large-diameter lead portion 40 bends and concentration of the bending stress at the joint portion can be avoided. Further, in order to avoid bending stress concentration, it is preferable that the length of the large-diameter lead portion 40 is not less than twice the diameter so that the large-diameter lead portion 40 is easily bent.
  • the resistance value of the large-diameter lead portion 40 can be reduced. Therefore, even when a high temperature and a large current flow, the self-heating is suppressed, and the long-term lead portion 40 can be used for a long time. Therefore, deterioration due to oxidation can be prevented. Further, by applying nickel (Ni) plating or the like to the large diameter lead portion 40, the heat resistance can be further improved. Furthermore, if the thermal conductivity of the large-diameter lead portion 40 is further increased, the heat transmitted from the ceramic heater 20 can be efficiently transmitted to the external connection terminal 15, and the heat resistance of the large-diameter lead portion 40 is further increased. Can be increased.
  • the external connection terminal 15 is filled with a filler 17 made of resin or low-melting glass between the external connection terminal 15 and the housing 11 in the housing 11. It is fixed by that. Therefore, when a connector (not shown) is inserted into the round pin 14 or screwed, stress applied to the external connection terminal 15 is applied to the joint between the external connection terminal 15 and the large-diameter lead portion 40. It is possible to prevent the joint from being broken without being applied. Further, stress may be generated in each part of the glow plug 10 due to vibration applied from the engine in a state where the glow plug 10 is attached to the engine. However, since the external connection terminal 15 is fixed by the filler 17.
  • the glow plug 10 having such a structure can shorten the ceramic heater 21 and omits the step of filling the metal outer cylinder 25 with powder and the step of reducing the diameter of the metal outer cylinder 25. And the manufacturing process can be simplified. In addition, since the glow plug 10 of the present embodiment fixes the metal outer cylinder 25 in the housing 11 by brazing rather than press-fitting, the process itself is also simplified. Furthermore, since the constituent members such as the external connection terminal 15, the large-diameter lead portion 40, and the metal outer cylinder 25 are not complicated shapes and structures but are simplified, the manufacturing cost can be reduced.
  • the glow plug according to the second embodiment of the present invention is different from the glow plug according to the first embodiment in the configuration of the junction between the large-diameter lead portion and the ceramic heater.
  • FIG. 2 shows an axial sectional view of the ceramic heater assembly 20A of the glow plug according to the present embodiment.
  • the ceramic heater assembly 20 ⁇ / b> A has a chamfered portion 39 a on the rear end surface of the ceramic insulating base 39.
  • the distance between the ceramic insulating base 39 around the joint and the metal outer cylinder 25 can be increased. Therefore, in the case of brazing, the insulation between the brazing material and the metal outer cylinder 25 is enhanced, and the dielectric breakdown can be reduced.
  • the glow plug according to the third embodiment of the present invention is different from the joint portion of the glow plug according to the first and second embodiments in the configuration of the joint portion between the large-diameter lead portion and the ceramic heater. .
  • FIG. 3 is a sectional view in the axial direction of the ceramic heater assembly 20B of the glow plug according to the present embodiment.
  • This ceramic heater assembly 20B has a concave portion 39b on the rear end face of the ceramic contact base 39, and within this concave portion 39b, the leading end portion of the large-diameter lead portion 40 and the rear end portion of the ceramic heater 21B are brazed. Etc. are joined together.
  • the recess 39b is formed as a relatively shallow recess, and the positive side metallized portion 23 is formed in the recess 39b.
  • the glow plug according to the fourth embodiment of the present invention is different in the configuration of the large-diameter lead portion from the large-diameter lead portion of the glow plug according to the first to third embodiments.
  • FIG. 4 shows an axial sectional view of the ceramic heater assembly 20C of the glow plug according to the present embodiment.
  • This ceramic heater assembly 20 ⁇ / b> C has an insulating material 41 disposed around the large-diameter lead portion 40.
  • the ceramic heater assembly 20C according to the present embodiment can be configured by inserting the large-diameter lead portion 40 into an insulating ceramic tube member.
  • insulating material 41 By disposing such an insulating material 41 around the large-diameter lead portion 40, even if the joint portion between the large-diameter lead portion 40 and the ceramic heater 21C is broken, a short circuit can be prevented. . If the insulating material 41 is configured to partially contact the metal outer cylinder 25, the heat of the large-diameter lead portion 40 is transmitted to the metal outer cylinder 25 via the insulating material 41, so that the large-diameter lead portion The temperature of 40 can be reduced.
  • the glow plug according to the embodiment of the present invention described above shows one aspect of the present invention and does not limit the present invention, and each embodiment is arbitrarily changed within the scope of the present invention. Is possible.
  • the configurations of the glow plugs according to the first to fourth embodiments can be appropriately combined and employed.

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 à incandescence du type à élément chauffant en céramique, qui présente une configuration et des étapes de fabrication simplifiées par rapport aux bougies à incandescence du type à élément chauffant traditionnelles, et qui comporte une partie en céramique de courte longueur. La bougie à incandescence du type à élément chauffant en céramique selon l'invention est pourvue d'un élément chauffant en céramique et d'un cylindre externe métallique, lequel cylindre supporte l'élément chauffant en céramique sur un côté d'extrémité, l'autre côté d'extrémité étant inséré dans un trou interne d'un logement et fixé à celui-ci. La bougie à incandescence du type à élément chauffant en céramique comporte une électrode de l'élément chauffant en céramique agencée sur la surface circonférentielle extérieure de l'élément chauffant en céramique, et l'autre électrode agencée dans la partie d'extrémité arrière de l'élément chauffant en céramique, l'autre électrode étant liée à une borne de connexion externe par le biais d'une section conductrice de grand diamètre.
PCT/JP2013/074634 2012-11-08 2013-09-12 Bougie à incandescence du type à élément chauffant en céramique Ceased WO2014073267A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014545600A JPWO2014073267A1 (ja) 2012-11-08 2013-09-12 セラミックスヒータ型グロープラグ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-246670 2012-11-08
JP2012246670 2012-11-08

Publications (1)

Publication Number Publication Date
WO2014073267A1 true WO2014073267A1 (fr) 2014-05-15

Family

ID=50684384

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/074634 Ceased WO2014073267A1 (fr) 2012-11-08 2013-09-12 Bougie à incandescence du type à élément chauffant en céramique

Country Status (2)

Country Link
JP (1) JPWO2014073267A1 (fr)
WO (1) WO2014073267A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09245940A (ja) * 1996-03-06 1997-09-19 Jidosha Kiki Co Ltd セラミック発熱体およびその製造方法
JPH10300084A (ja) * 1997-04-22 1998-11-13 Ngk Spark Plug Co Ltd セラミックヒータおよびセラミックグロープラグ
JP2004259610A (ja) * 2003-02-26 2004-09-16 Kyocera Corp セラミックヒータとその製造方法、およびグロープラグ
JP2005207721A (ja) * 2003-12-24 2005-08-04 Denso Corp グロープラグ
JP2005315447A (ja) * 2004-04-27 2005-11-10 Kyocera Corp セラミックヒーターおよびグロープラグ
WO2009096477A1 (fr) * 2008-01-29 2009-08-06 Kyocera Corporation Dispositif de chauffage en céramique et bougie de préchauffage
JP2010080257A (ja) * 2008-09-26 2010-04-08 Kyocera Corp セラミックヒーター
JP2011017504A (ja) * 2009-07-10 2011-01-27 Bosch Corp グロープラグ
WO2011049578A1 (fr) * 2009-10-23 2011-04-28 Federal-Mogul Ignition Company Bougie à incandescence et ensemble d'élément chauffant pour celle-ci avec une connexion améliorée entre une électrode centrale et une sonde d'élément chauffant de l'ensemble d'élément chauffant
JP2012033340A (ja) * 2010-07-29 2012-02-16 Kyocera Corp セラミックヒータおよびこれを備えたグロープラグ
JP2012063078A (ja) * 2010-09-16 2012-03-29 Ngk Spark Plug Co Ltd グロープラグ及びその製造方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09245940A (ja) * 1996-03-06 1997-09-19 Jidosha Kiki Co Ltd セラミック発熱体およびその製造方法
JPH10300084A (ja) * 1997-04-22 1998-11-13 Ngk Spark Plug Co Ltd セラミックヒータおよびセラミックグロープラグ
JP2004259610A (ja) * 2003-02-26 2004-09-16 Kyocera Corp セラミックヒータとその製造方法、およびグロープラグ
JP2005207721A (ja) * 2003-12-24 2005-08-04 Denso Corp グロープラグ
JP2005315447A (ja) * 2004-04-27 2005-11-10 Kyocera Corp セラミックヒーターおよびグロープラグ
WO2009096477A1 (fr) * 2008-01-29 2009-08-06 Kyocera Corporation Dispositif de chauffage en céramique et bougie de préchauffage
JP2010080257A (ja) * 2008-09-26 2010-04-08 Kyocera Corp セラミックヒーター
JP2011017504A (ja) * 2009-07-10 2011-01-27 Bosch Corp グロープラグ
WO2011049578A1 (fr) * 2009-10-23 2011-04-28 Federal-Mogul Ignition Company Bougie à incandescence et ensemble d'élément chauffant pour celle-ci avec une connexion améliorée entre une électrode centrale et une sonde d'élément chauffant de l'ensemble d'élément chauffant
JP2012033340A (ja) * 2010-07-29 2012-02-16 Kyocera Corp セラミックヒータおよびこれを備えたグロープラグ
JP2012063078A (ja) * 2010-09-16 2012-03-29 Ngk Spark Plug Co Ltd グロープラグ及びその製造方法

Also Published As

Publication number Publication date
JPWO2014073267A1 (ja) 2016-09-08

Similar Documents

Publication Publication Date Title
JP6005175B2 (ja) セラミックスヒータ型グロープラグ及びその製造方法
JP6265570B2 (ja) セラミックスヒータ型グロープラグの製造方法及びセラミックスヒータ型グロープラグ
JP5485843B2 (ja) グロープラグ及びその製造方法
WO2002033149A1 (fr) Bougie de prechauffage en ceramique et procede de production de cette derniere
JP2001141238A (ja) 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
JP6245716B2 (ja) セラミックスヒータ型グロープラグの製造方法及びセラミックスヒータ型グロープラグ
JP6152469B2 (ja) セラミックスヒータ型グロープラグ
JPWO2015146554A1 (ja) セラミックスヒータ型グロープラグ
JP6218461B2 (ja) グロープラグの製造方法
WO2014073267A1 (fr) Bougie à incandescence du type à élément chauffant en céramique
JP6270185B2 (ja) セラミックスヒータ型グロープラグの製造方法及びセラミックスヒータ型グロープラグ
JP4310565B2 (ja) セラミックヒータ型グロープラグおよびその製造方法
JP2005190948A (ja) セラミックヒーター
JP2002206739A (ja) セラミックスグロープラグおよびその製造方法
JP5764333B2 (ja) グロープラグ組み付け構造
JP2011017504A (ja) グロープラグ
JP2002158082A (ja) セラミックヒーター装置
JP3818113B2 (ja) セラミックスヒータ型グロープラグの製造方法
EP3287699A1 (fr) Bougie de préchauffage
JP2003166714A (ja) グロープラグ及びグロープラグの製造方法
WO2016167066A1 (fr) Bougie incandescente

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13853423

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2014545600

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13853423

Country of ref document: EP

Kind code of ref document: A1