EP2669578B1 - Bougie de préchauffage - Google Patents

Bougie de préchauffage Download PDF

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Publication number
EP2669578B1
EP2669578B1 EP12739873.3A EP12739873A EP2669578B1 EP 2669578 B1 EP2669578 B1 EP 2669578B1 EP 12739873 A EP12739873 A EP 12739873A EP 2669578 B1 EP2669578 B1 EP 2669578B1
Authority
EP
European Patent Office
Prior art keywords
axis
contact member
axial bore
end portion
center shaft
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
EP12739873.3A
Other languages
German (de)
English (en)
Other versions
EP2669578A4 (fr
EP2669578A1 (fr
Inventor
Katsuteru ITO
Hiroyuki Suzuki
Gaku Hatano
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.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
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 NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of EP2669578A1 publication Critical patent/EP2669578A1/fr
Publication of EP2669578A4 publication Critical patent/EP2669578A4/fr
Application granted granted Critical
Publication of EP2669578B1 publication Critical patent/EP2669578B1/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 second contour segment having the radius R2 of curvature extends along the second axis with a radius of curvature greater than that of the first contour segment having the radius R1 of curvature.
  • the second contour segment can function as a core which supports the entire contact member and restrains the contact member from bending and being dragged inward. Therefore, the contact member is restrained from bending or wrinkling at the second contour segment.
  • the overlap region of the forward end portion 31 and the connection ring 85 is subjected to laser welding, whereby the forward end portion 31 and the connection ring 85 are joined together.
  • the center shaft 3 is electrically connected to the electrode lead portion 26 of the ceramic heater 2 via the connection ring 85.
  • the center shaft 3 and the metallic shell 4 are held mutually in an electrically insulated condition in the axial bore 43.
  • connection terminal 5 is fixedly attached to the connection end portion 36 of the center shaft 3.
  • the connection terminal 5 has a cap-like trunk portion 52 which is fitted externally to the connection end portion 36, and a pin-like protrusion 53 protruding rearward from the trunk portion 52.
  • the trunk portion 52 has a flange portion 51 provided at its forward open end in such a manner as to radially project along the entire circumference.
  • a plug cap (not shown) is fitted to the protrusion 53 of the connection terminal 5.
  • the heat-generating element 24 (see FIG. 1 ) of the ceramic heater 2 generates heat through application of electricity between one end of the heat-generating resistor 27 which is grounded to the engine via the holding member 8 and the metallic shell 4, and the other end of the heat-generating resistor 27 which is connected to the plug cap via the connection terminal 5 and the center shaft 3.
  • the contour 70 has three kinds of contour segments (line segments which constitute the contour); namely, a second contour segment 71, a first contour segment 72, and third contour segments 73.
  • the second contour segment 71 extends in the form of a straight line along the axis P.
  • the first contour segment 72 assumes the form of a curve extending along the axis P and swelling radially outward in a direction orthogonal to the axis P.
  • the third contour segments 73 connect the second contour segment 71 and the first contour segment 72 at their ends located on the same side with respect to the axis P, and each of the third contour segments 73 assumes the form of a curve extending toward the outside of the cross section 75 while swelling.
  • connections between the first contour segment 72 and the third contour segments 73 are upper and lower (forward and rear) ends of the contact member 7 with respect to the direction of the axis P.
  • the first contour segment 72 is disposed radially outward of the second contour segment 71 and is longer in length along the direction of the axis P than the second contour segment 71. Therefore, each of the third contour segments 73 extends radially outward from the end of the second contour segment 71 and is connected to the end of the first contour segment 72. Furthermore, the contour 70 forms a mirror image with respect to the center position (represented by the dash-dot-dot line A-A in FIG. 3 ) in the direction of the axis P. That is, the contact member 7 has a symmetrical shape along the direction of the axis P.
  • the contact member 7 can reliably hold the center shaft 3 in the axial bore 43 and thus can restrain oscillation of the center shaft 3 when the glow plug 1 receives external vibration or the like.
  • the contact members 107, 207, and 307 shown in FIGS. 6 , 7, and 8 , respectively, are similar in preferred features to the contact member 7 of the present embodiment shown in FIG. 3 .
  • the cross section is such that the length L1 along the extending direction of the axis P is longer than the length L2 along a direction orthogonal to the extending direction of the axis P (along a radial direction); i.e., the cross section has a short radial length so as to have a flat profile (L1 > L2).
  • the cross section is such that the radial length L2 is half the length L1 along the direction of the axis P or less (L1/2 ⁇ L2).
  • this relationship half of the length along the axis P > the radial length (L1/2 ⁇ L2)
  • this relationship may not be satisfied so long as the relationship L1 > L2 is satisfied).
  • connection base portion 37 of the center shaft 3 may have, at a position located toward its forward end, a stopper in the form of a flange or a protrusion for forming some level difference.
  • a stopper in the form of a flange or a protrusion for forming some level difference.
  • the stopper prevents movement of the contact member 7 to the intermediate trunk portion 33 of the center shaft 3.
  • the contact member 7 may be disposed between the connection base portion 37 and the inner circumferential surface of the axial bore 43 in a noncontacting manner in relation to the insulation member 6.

Landscapes

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

Claims (5)

  1. Bougie de préchauffage (1) comprenant :
    un dispositif de chauffage (2) ayant, dans une partie d'extrémité avant (22), une résistance génératrice de chaleur (27) qui génère de la chaleur par mise sous tension ;
    une coque métallique (4) prenant la forme d'un tube ayant un trou axial (43) s'étendant le long d'un premier axe (O) qui est l'axe de la coque métallique (4), et supportant le dispositif de chauffage (2) directement ou indirectement au niveau d'une partie d'extrémité avant (41) ;
    un arbre central (3) prenant une forme de type tige, disposé dans le trou axial (43) de la coque métallique (4) avec un intervalle formé entre celui-ci et une surface circonférentielle intérieure du trou axial (43), ayant une première partie d'extrémité (31) reliée à une partie d'extrémité arrière (23) du dispositif de chauffage (2), et ayant l'autre partie d'extrémité (36) qui fait saillie à partir d'une extrémité arrière (48) de la coque métallique (4) ; et
    un élément de contact (7) formé d'un élément élastique électriquement isolant, prenant une forme annulaire, inséré dans le trou axial (43) au niveau d'une partie d'extrémité arrière du trou axial (43), et disposé de manière à être en contact avec la surface circonférentielle intérieure du trou axial (43) et avec l'arbre central (3) ;
    la bougie de préchauffage (1) étant caractérisée en ce que :
    un contour (70) de l'une (75) de deux coupes transversales résultant de la découpe de l'élément de contact (7) dans un état antérieur à la fixation à la bougie de préchauffage (1) par un plan contenant un second axe (P) qui est l'axe de l'élément de contact (7) comporte
    un premier segment de contour (72) prenant la forme d'une courbe s'étendant le long du second axe (P) et augmentant radialement vers l'extérieur avec un rayon de courbure R1, et
    un deuxième segment de contour (71) prenant l'une des formes suivantes a) ou b) :
    a) la forme d'une ligne rectiligne s'étendant le long du second axe (P) ;
    b) la forme d'une courbe s'étendant le long du second axe (P) et augmentant radialement vers l'intérieur avec un rayon de courbure R2 satisfaisant à une expression relationnelle R1 < R2.
  2. Bougie de préchauffage (1) selon la revendication 1, dans laquelle l'élément de contact (7) est tel que, comme observé sur la coupe transversale (75), une longueur le long d'une direction d'extension du second axe (P) est plus longue qu'une longueur le long d'une direction orthogonale au second axe (P).
  3. Bougie de préchauffage (1) selon la revendication 1 ou 2, dans laquelle :
    l'arbre central (3) comprend en outre
    une partie de tronc arrière (37) disposée à une position telle par rapport à la direction d'extension du premier axe (O) de la coque métallique (4) qu'elle fait face à la partie d'extrémité arrière de la surface circonférentielle intérieure du trou axial (43), et ayant un diamètre supérieur à celui de l'autre partie d'extrémité (36) et
    une partie d'épaulement (38) reliant la partie de tronc arrière (37) et l'autre partie d'extrémité (36) d'une manière effilée ;
    la coque métallique (4) comprend en outre une partie effilée (47) s'étendant d'une manière effilée au niveau de la partie d'extrémité arrière du trou axial (43) à partir d'une position située en avant d'une extrémité avant de la partie d'épaulement (38) vers l'extrémité arrière (48) située en arrière de la position par rapport à la direction d'extension du premier axe (O) ; et
    l'élément de contact (7) est disposé de telle sorte que le deuxième segment de contour (71) est en contact avec l'arbre central (3) et de telle sorte que le premier segment de contour (72) est en contact avec une surface circonférentielle intérieure du trou axial (43) situé en avant de la partie effilée.
  4. Bougie de préchauffage (1) selon la revendication 3, dans laquelle le contour (70) de l'élément de contact (7) comprend en outre un troisième segment de contour (73) qui est connecté, au niveau d'une première extrémité, au deuxième segment de contour (71); qui s'étend radialement vers l'extérieur depuis la première extrémité vers son autre extrémité tout en s'étendant le long du second axe (P); qui est connecté, au niveau de l'autre extrémité, au premier segment de contour (72) ; et dont un point de connexion au premier segment de contour (72) est une extrémité de l'élément de contact (7) par rapport à la direction d'extension du second axe (P).
  5. Bougie de préchauffage (1) selon la revendication 4, dans laquelle le contour (70) forme une image miroir par rapport à une position centrale (A-A) dans la direction d'extension du second axe (P).
EP12739873.3A 2011-01-25 2012-01-16 Bougie de préchauffage Active EP2669578B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011013388 2011-01-25
PCT/JP2012/050708 WO2012102109A1 (fr) 2011-01-25 2012-01-16 Bougie de préchauffage

Publications (3)

Publication Number Publication Date
EP2669578A1 EP2669578A1 (fr) 2013-12-04
EP2669578A4 EP2669578A4 (fr) 2018-01-03
EP2669578B1 true EP2669578B1 (fr) 2019-08-14

Family

ID=46580681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12739873.3A Active EP2669578B1 (fr) 2011-01-25 2012-01-16 Bougie de préchauffage

Country Status (5)

Country Link
US (1) US20130248508A1 (fr)
EP (1) EP2669578B1 (fr)
JP (1) JP5806211B2 (fr)
KR (1) KR101638670B1 (fr)
WO (1) WO2012102109A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9574774B2 (en) * 2014-03-27 2017-02-21 Kyocera Corporation Heater and ignition apparatus equipped with the heater
US10253982B2 (en) * 2014-12-22 2019-04-09 Ngk Spark Plug Co., Ltd. Glow plug with pressure sensor
DE102016114929B4 (de) * 2016-08-11 2018-05-09 Borgwarner Ludwigsburg Gmbh Druckmessglühkerze

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0484863U (fr) * 1990-11-29 1992-07-23
EP0989370A3 (fr) * 1998-09-25 2005-04-20 Delphi Technologies, Inc. Métal pour extrémité de capteur d'incandescence
DE10012266A1 (de) * 2000-03-14 2001-09-20 Bosch Gmbh Robert Glühstiftkerze für eine Brennkraftmaschine
JP2002013736A (ja) * 2000-06-27 2002-01-18 Denso Corp グロープラグ
JP2006112478A (ja) * 2004-10-13 2006-04-27 Nok Corp 往復動用密封リング
DE102007015491B4 (de) * 2006-03-30 2025-08-28 Niterra Co., Ltd. Glühkerze
JP4960118B2 (ja) 2006-03-30 2012-06-27 日本特殊陶業株式会社 グロープラグ
JP4897467B2 (ja) * 2006-12-19 2012-03-14 日本特殊陶業株式会社 グロープラグおよびその製造方法
JP5964547B2 (ja) * 2011-01-25 2016-08-03 日本特殊陶業株式会社 グロープラグおよびその製造方法

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
JP5806211B2 (ja) 2015-11-10
KR20140037817A (ko) 2014-03-27
JPWO2012102109A1 (ja) 2014-06-30
WO2012102109A1 (fr) 2012-08-02
KR101638670B1 (ko) 2016-07-11
US20130248508A1 (en) 2013-09-26
EP2669578A4 (fr) 2018-01-03
EP2669578A1 (fr) 2013-12-04

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