EP1308672B1 - Bougie d'allumage à incandescence pour moteurs diesel et son procédé de fabrication - Google Patents

Bougie d'allumage à incandescence pour moteurs diesel et son procédé de fabrication Download PDF

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Publication number
EP1308672B1
EP1308672B1 EP20020017728 EP02017728A EP1308672B1 EP 1308672 B1 EP1308672 B1 EP 1308672B1 EP 20020017728 EP20020017728 EP 20020017728 EP 02017728 A EP02017728 A EP 02017728A EP 1308672 B1 EP1308672 B1 EP 1308672B1
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EP
European Patent Office
Prior art keywords
housing
sheath
diameter
press fit
glow plug
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.)
Expired - Lifetime
Application number
EP20020017728
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German (de)
English (en)
Other versions
EP1308672A2 (fr
EP1308672A3 (fr
Inventor
Arihito Bosch Automotive Systems Corp. Tanaka
Takashi Bosch Automotive Systems Corp. Aota
Toshitsugu Bosch Automotive Systems Corp. Miura
Jian Bosch Automotive Systems Corp. Zhao
Osamu Bosch Automotive Systems Corp. Sekiguchi
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Bosch Corp
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Bosch Automotive Systems Corp
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Publication date
Application filed by Bosch Automotive Systems Corp filed Critical Bosch Automotive Systems Corp
Publication of EP1308672A2 publication Critical patent/EP1308672A2/fr
Publication of EP1308672A3 publication Critical patent/EP1308672A3/fr
Application granted granted Critical
Publication of EP1308672B1 publication Critical patent/EP1308672B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 which is used as a starting aid for a diesel engine, and a method of manufacturing the same.
  • a combustion scheme of a diesel engine is shifting from a type using sub-combustion chambers to a so-called direct injection type and also toward a multiplication of valves.
  • a glow plug which is used in a diesel engine of direct injection type is disposed in facing relationship with a main combustion chamber through the wall of an interposed cylinder head, and thus requires an increased overall length and a reduced diameter as compared with one which has been used to preheat sub-combustion chambers.
  • the thickness of the cylinder head must be increased in order to secure the strength thereof, and in addition, there must be secured spacings between valve openings, injection nozzles mounting opening and a glow plug mounting opening in order to prevent an interference therebetween. This results in a need for an opening of a small diameter and a greater length which is formed therein to receive the glow plug, which thus must be formed into an elongate configuration in a corresponding manner.
  • An integral assembly which comprises the heater, the electrode fitting and the external connection terminal is inserted through an end of the housing which is to be secured to the heater with a threaded end of the external connection terminal disposed foremost; the heater is secured into the distal end of the housing as by a press fit; the threaded end of the external connection terminal is allowed to project through the other end of the housing and is supported by the housing through an insulating bushing interposed therebetween.
  • an M4 thread is used for the external connection terminal, and the M4 threaded portion must be passed through the distal end to the other end of an internal bore of the housing. Consequently, it is necessary that the inner diameter of the housing be greater than 4mm which is a maximum diameter of the M4 thread, and usually the inner diameter is chosen to be on the order of 4.4mm to provide a certain margin.
  • the outer diameter of the housing is reduced while maintaining a required size for the inner diameter, it follows that the wall thickness of the housing is reduced.
  • the wall thickness of the distal end which represents a seat area to be disposed in abutment against the seat portion of the cylinder head, will, be greatly reduced.
  • the actual thickness of the seat area will be further reduced.
  • the US 5,039,839 discloses a glow plug including a heating element for pre-heating a subcombustion or a combustion chamber for a diesel engine.
  • a glow plug for a diesel engine which allows a sufficient seat area to be secured on the distal end of the housing or on the front end of a sheath if the outer diameter of the housing, which is a fixture for mounting the glow plug into the cylinder head, is reduced while securing a required inner diameter.
  • a glow plug for a diesel engine defined in Claim 1 in which one end of a sheath which carries a heater is disposed as a press fit in the internal bore of the cylindrical housing and is secured therein.
  • the housing in a region where the sheath is disposed as a press fit, the housing has an inner diameter which is greater than the inner diameter of an opening in the housing through which the sheath projects.
  • a difference between the inner diameter and the outer diameter of the housing normally represents the width of the seat area located at the distal end of the housing.
  • the inner diameter of the housing is maintained in a region where the sheath is inserted, but the diameter of the opening in the housing is reduced as compared with the inner diameter where the sheath is disposed as a press fit. Accordingly, the width of the seat area at the distal end of the housing can be increased.
  • the housing comprises a body in which the sheath is disposed as a press fit and secured therein, and a seat adapter mounted on the distal end of the body and presenting a seat area for contact with the cylinder head.
  • the seat adapter is engaged with the sheath to urge it so that the sheath can be disposed as a press fit in the housing, thus greatly facilitating disposing it as a press fit therein.
  • This also allows a ceramics heater which has been difficult to be disposed as a press fit to be disposed in a safe manner.
  • the material for the seat adapter can be chosen to be different from the material for the body of the housing, thus allowing the hermetic seal of the seat to be improved.
  • the distal end of the sheath is formed with a portion of a reduced diameter while a rear end thereof is formed with a portion of an increased diameter which is secured to the internal surface of the housing.
  • the portion of the reduced diameter projects through the opening in the housing.
  • the present invention also relates to a method of manufacturing a glow plug for a diesel engine in which one end of a sheath carrying a heater is disposed as a press fit and secured in an internal bore of a cylindrical housing.
  • a sheath having a reduced diameter toward the distal end and an increased diameter toward a rear end is inserted through the distal end of the cylindrical housing.
  • the distal end of the housing is subject to a plastic deformation so as to extend along a juncture between the reduced diameter and the increased diameter of the sheath, thus increasing the area of the seat area formed at the distal end of the housing.
  • the sheath configuration is such that it has a reduced diameter toward the distal end and an increased diameter toward the rear end.
  • the distal end of the housing is subject to a plastic deformation so as to conform to the configuration of the sheath, whereby the inner diameter in the region of the opening can be made coincident with the portion of the reduced diameter of the sheath while maintaining the outer diameter of the seat area located at the distal end of the housing unchanged from the remainder of the housing, thus allowing a seat area having a sufficient area to be formed while facilitating the machining of the housing, contributing to a reduction in the total cost.
  • a glow plug generally designated by numeral 1, of the embodiment shown in Figs. 1 and 2 represents a ceramics heater glow plug including a ceramics heater 2 as a heating element.
  • the ceramics heater 2 includes a heating element 6 which is embedded in a ceramics insulator 4 which constitutes the body of the heater.
  • One end 6a of the heating element 6 is connected to a negative pole lead wire 8 while the other end 6b is connected to a positive pole lead wire 10.
  • the negative pole lead wire 8 is taken out to the outer periphery of the ceramics insulator 4 to be brazed to the internal surface of a sheath (metallic outer casing) 12, which will be described later, to be electrically connected therewith.
  • the positive pole lead wire 10 extends to the opposite end from the location where the heating element 6 is embedded (or the left end as viewed in Figs. 1 and 2), and is brazed to the distal end of an electrode fitting lead wire 14 within a mounting opening formed in this end face, and thus is electrically connected therewith.
  • the rear end of the electrode fitting lead wire 14 (or the right end as viewed in Figs. 1 and 2) is secured to the distal end of an electrode fitting 16 which is formed of a rigid body, the rear end of which is in turn secured to the distal end of an external connection terminal 18.
  • the ceramics heater 2 constructed in the manner mentioned above is joined to the sheath 12 by brazing, and thus is secured through the interposed sheath 12 to a cylindrical housing 20 which represents a fixture to the cylinder head.
  • the sheath 12 includes a portion of a reduced diameter 12a toward its front end, and a portion of an increased diameter 12b which is located rearward thereof. A rear portion of the ceramics heater 2 is inserted into the portion of a reduced diameter 12a and is joined thereto as by brazing.
  • the electrode fitting 16 which is electrically connected to the positive pole lead wire 10 of the ceramics heater 2 through the electrode fitting lead wire 14 is secured to the sheath 12 by a swaging operation.
  • This swaging operation will be described briefly.
  • the positive pole lead wire 10 of the ceramics heater 2 and the electrode fitting lead wire 14 which is secured to the electrode fitting 16 are inserted into a mounting opening formed in the ceramics insulator 4 and are joined together by brazing, and the ceramics heater 2 is secured to the end of the sheath 12 which is close to the end of the portion of a reduced diameter 12a by brazing.
  • a heater portion 2a located at the distal end of the ceramics heater 2 in which the heating element 6 is embedded should remain exposed outside the sheath 12.
  • a refractory insulating powder such as magnesia (MgO) 22 is filled into a space in which the junction between the electrode fitting lead wire 14 and the electrode fitting 16 is contained through an opening 12c which is formed in the end of the portion 12b of an increased diameter of the sheath 12.
  • a seal member 25 which is formed of rubber such as silicone rubber or fluorine-contained rubber is inserted into the opening 12c of the sheath 12.
  • the portion of an increased diameter 12b of the sheath 12 in which the junction between the electrode fitting lead wire 14 and the electrode fitting 16 is contained is subject to a swaging operation to reduce the outer diameter of the sheath 12 while increasing a density of the refractory insulating powder 22 to secure the electrode fitting 16 within the sheath 12.
  • the housing 20 in which the sheath 12 is secured is substantially cylindrical in configuration and is internally formed with a stepped axial bore 24.
  • the internal bore 24 of the housing 20 includes a central portion 24a of a reduced diameter, and a press fit region 24b which is located nearer the distal end 20a (or the left end as viewed in Fig. 2) of the housing and which has a slightly greater inner diameter than the portion 24a of a reduced diameter.
  • the rear end of the sheath 12 is disposed as a press fit in the press fit region 24b to be secured therein.
  • the internal bore 24 of the housing 20 also includes a portion 24c of an inner diameter which is slightly greater than the inner diameter of the press fit region 24b at a location further nearer the distal end 20a.
  • the distal end 20a of the housing 20 includes an internal surface 24d which is tapered substantially in conformity to the tapering of the juncture 12d between the portion of a reduced diameter 12a and the portion of an increased diameter 12b of the sheath 12.
  • the distal end 20a Around its outer periphery, the distal end 20a has a front end face 26 which is sharply beveled and which serves as a seat area which is to be disposed in abutment against the seat of the cylinder head of an engine not shown.
  • a threaded portion 20c, which allows the glow plug 1 to be threadably engaged with the cylinder head is formed around the outer periphery of the end 20b of the housing 20 which is opposite from the distal end 20a in which the ceramics heater 2 is secured through the interposed sheath 12 (or the right end as viewed in Fig. 1).
  • the configuration of the distal end 20a of the housing 20 to which the ceramics heater 2 is secured will be described in detail.
  • the central portion of the internal bore 24 in the housing 20 is the portion 24a of a reduced diameter, and the press fit region 24b of a diameter which is slightly greater than the inner diameter of the portion 24a is formed forwardly of the portion 24a (or to the left thereof as viewed in Fig. 3), and another portion 24c of a slightly greater diameter is formed forwardly of the press fit region 24b.
  • the internal surface 24d of the distal end 20a is tapered, and hence the axial bore 24 has a minimum inner diameter at the location of an opening 24e which is disposed at the forward end thereof.
  • the housing 20 used for the glow plug 1 for a diesel engine according to the present invention is characterized in that the inner diameter D1 of the press fit region 24b is greater than the diameter D2 of the opening 24e or D1 > D2.
  • the configuration of the housing 20 before the assembly is such that the distal end 20X has the same inner diameter and outer diameter as the portion 24c which is contiguous to the press fit region 24b of the axial bore 24 and which has a slightly greater diameter than the press fit region 24b, and an assembly which integrally includes the sheath 12, the electrode fitting 16 and the external connection terminal 18 is inserted into the distal end 20X with the threaded portion 18a (see Fig. 1) of the external connection terminal 18 disposed foremost.
  • the assembly is inserted into the housing 20 from the left side as viewed in Fig.
  • the rear end of the sheath 12 is disposed as a press fit into the press fit region 24b of the axial bore 24 in the housing 20 and is then secured therein.
  • the distal end 20X of the housing 20 is subject to a plastic deformation so that the internal surface 24d of the distal end (this end after the plastic deformation is designated by numeral 20a) extends along the tapered juncture 12d between the portion of an increased diameter 12b and the portion of a reduced diameter 12a of the sheath 12 while forming a beveled surface which provides a seat area 26 which is to be brought into contact with the cylinder head around the outer periphery thereof (see Fig. 4(b)).
  • the distal end 20X having the same diameter as the remainder of the housing 20 is subject to a plastic deformation to form the seat area 26 which is to be disposed in abutment against the cylinder head.
  • the outer surface of the distal end 20a retains the same diameter as the remainder of the housing 20 which is not subject to the plastic deformation while the opening 24e has an inner diameter which is substantially equal to the diameter of the portion 12a of a reduced diameter of the sleeve 12.
  • the outer diameter of the housing 20 is reduced (to M8, for example) and the inner diameter is maintained so as to allow the threaded portion 18a of the external connection terminal 18 (which may be M4, for example) to pass therethrough, there can be obtained a seat area 26 having a sufficient area, reducing any likelihood that the cylinder head may be damaged.
  • the internal bore 24 of the housing 20 has a similar size as a conventional large diameter housing (M10, for example), allowing the strength of the electrode fitting 16 to be maintained and allowing a torque which is applied when tightening the threaded portion 18a of the external connection terminal 18 to be chosen in a usual manner as in the conventional practice.
  • the machining of the housing 20 is facilitated, allowing a total cost to be reduced.
  • Fig. 5 is a longitudinal section of a glow plug 101 for a diesel engine according to a second embodiment.
  • a ceramics heater 2, a sheath 12, an electrode fitting lead wire 14, an electrode fitting 16 and an external connection terminal 18 which are secured within a housing 120 are each constructed in the similar manner as shown in the first embodiment, and therefore will not be described again by using a similar reference character as used before for a corresponding part.
  • the housing 120 comprises a housing body 120A in which the described parts are secured, and a seat adapter 120B which is mounted on the distal end of the body 120A.
  • the housing body 120A has an internal axial bore 124, which includes a central portion 124a of a reduced diameter, a press fit region 124b of a slightly greater diameter than the portion 124a and disposed forwardly of the portion 141a and offset toward the distal end 120Aa of the housing body 120A, and a portion 124c of a slightly greater diameter than the press fit region 124b which is disposed forwardly of the press fit region 124b and offset toward the distal end 120Aa.
  • the seat adapter 120B having a seat area 126 which is to be disposed in abutment against the cylinder head is similarly constructed as a portion of the housing 20 of the first embodiment which is disposed toward the distal end 20a.
  • the distal end 120Ba of the seat adapter has an internal surface 124Bd which is tapered substantially in conformity to the juncture 12d between the portion 12b of an increased diameter and the portion 12a of a reduced diameter of the sheath 12.
  • a seat area 126 is formed around the outer periphery of the distal end 120Ba and has an external diameter which is the same as the remainder of the seat adapter and an internal diameter which substantially coincides with the external diameter of the portion 12a of a reduced diameter of the sheath 12.
  • the seat adapter 120B has an opening 120Be at its distal end which is of an inner diameter which is less than the inner diameter of the press fit region 124b of the housing body 120A. Accordingly, the inner diameter of the housing body 120A can be reduced while using a conventional large diameter ceramics heater 2 in the similar manner as in the prior art. In addition, there can be secured a seat area 126 having a sufficient breadth.
  • the distal end 20X of the housing remains to be of a uniform diameter up to the opening before the assembly takes place, and the sheath 12 having the ceramics heater 2 secured therein is inserted into the housing 20 through the distal end 20X and disposed as a press fit in the press fit region 24b to be secured therein. Subsequently, the distal end 20X is subject to a plastic deformation, whereby the inner diameter D2 of the opening 24e is reduced below the inner diameter D1 of the press fit region 24b.
  • the seat adapter 120B is previously configured as shown in Fig. 5.
  • the inner surface 120Bd of the distal end 120Ba is engaged with the juncture 12d between the portion 12b of an increased diameter and the portion 12a of a reduced diameter of the sheath 12 to allow the sheath 12 to be disposed as a press fit in the press fit region 124b of the housing 120, thus greatly facilitating disposing it as a press fit.
  • This allows a ceramics heater 2 which has been difficult to be disposed as a press fit to be safely disposed as a press fit.
  • the material for the seat adapter 120B can be chosen to be different such as aluminum alloy or brass from the material for the housing body 120A, thus allowing the hermetic seal of the seat to be improved.
  • Fig. 6 is a longitudinal section of a glow plug 201 for a diesel engine according to a third embodiment.
  • the glow plug 201 is distinct from the glow plug 101 of the second embodiment only in the construction of a heater 202.
  • a ceramics heater 2 has been used, but in the third embodiment, a metal heater 202 is used.
  • the metal heater 202 includes a sheath 212 including a portion 212b of an increased diameter which is disposed as a press fit within the housing body 120A, and a portion 212a of a reduced diameter which projects externally of the seat adapter 120B.
  • the assembly can take place by similar steps as used in the second embodiment, achieving a similar advantage.
  • the metal heater 202 is inexpensive as compared to the ceramics heater 2, thus providing a glow plug 201 for a diesel engine which is of a lower cost.
  • Fig. 7 is a longitudinal section of a glow plug 301 for a diesel engine.
  • a housing 320 is integral up to a seat area 326 which is to be disposed in abutment against the cylinder head in the similar manner as in the first embodiment (shown in Fig. 1).
  • the housing 320 includes a distal end 320a which is previously formed with an internal tapered surface 324d and an outer surface which provides a seat area 326 having a sufficient seat area. Accordingly, the ceramics heater 2 cannot be inserted through an opening 324e formed in the distal end 320a, and thus is inserted through the rear end (not shown, but through the end to which the external connection terminal 18 is secured) to be secured therein.
  • the internal bore 324 of the housing 320 is not provided with a press fit region of a reduced diameter as shown in other embodiments at a location where the sheath 12 is to be secured, but has an inner diameter which allows the portion 12b of an increased diameter of the sheath 12 to pass therethrough.
  • the ceramics heater 2 is inserted into the internal axial bore 324 through the rear end (located to the right, as viewed in Fig. 8) of the housing 320 (see Fig. 8(a)).
  • the ceramics heater 2 and the portion 12a of a reduced diameter of the sheath 12 to which the ceramics heater 2 is secured are caused to project externally through the opening 324e in the housing 320 (see Fig. 8(b)). Under this condition, the juncture 12d located between the portion 12a of a reduced diameter and the portion 12b of an increased diameter of the sheath 12 abuts against the tapered surface 324d formed on the internal surface of the distal end 320a of the housing 320 to be positioned.
  • a portion 320d around the outer periphery of the housing 320 into which the rear end of the sheath 12 is received is subjected to a plastic deformation (see an arrow P shown in Fig. 8 (c)), thereby securing the ceramics heater 2 and the sheath 12 within the housing 320.
  • the housing 320 has an inner diameter at a location where the external surface of the sheath 12 is secured as a result of the plastic deformation which is greater than the inner diameter of the opening 324e, achieving a similar effect and advantage as in the previous embodiments.
  • Fig. 9 is a longitudinal section of a glow plug 401 for a diesel engine according to an alternative design which doesn't fall under the scope of claim 1.
  • a seat area 26, 126 or 326 which is to be disposed in abutment against the cylinder head of an engine is formed on the front end face of the housing 20 or 320 or on the front end face of the seat adapter 120B which is disposed forwardly of the housing body 120A.
  • a seat area 426 is formed on the external surface of a sheath 412 to which the ceramics heater 2 is secured.
  • the sheath 412 to which the ceramics heater 2 is secured includes a portion 412a of a reduced diameter in a region toward the front end where the ceramics heater 2 is secured, and a portion 412b of a greater diameter than the portion 412a which is to be disposed as a press fit in the housing 420 to be secured, in the similar manner as in the previous embodiments.
  • the diameter of the portion 412b is slightly greater than the diameter of a press fit region 424b defined in the internal axial bore 424 of the housing 420, with a portion 412e of an increased diameter being formed between the portion 412a of a reduced diameter and the portion 412b of an increased diameter.
  • the portion 412e of an increased diameter has an external diameter which is substantially equal to the external diameter of the housing 420, and the rear end face 412f of the portion 412e of an increased diameter, or a region between the portion 412e of an increased diameter and the rear portion 412b which is disposed as a press fit into the housing 420, represents a substantially upright step.
  • a seat area 426 which is to be disposed in abutment against the cylinder head is formed on the front end face of the portion 412e of an increased diameter which faces the portion 412a of a reduced diameter.
  • the portion 412e of an increased diameter which has substantially the same external diameter as the housing 420 is formed on a portion of the sheath 412 which is located outside the housing 420, and the seat area 426 is defined between the portion 412e of an increased diameter and the portion 412a of a reduced diameter which is located forwardly thereof, thus allowing a sufficient area to be secured on the seat area 426. Since the sheath 412 can be disposed as a press fit in the housing 420 by utilizing the seat area 426, it is a simple matter to dispose it as a press fit, and even a ceramic heater 2 which has been difficult to disposed as a press fit can be safely disposed as a press fit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Claims (4)

  1. Bougie de préchauffage pour un moteur diesel où une extrémité d'une gaine portant un dispositif de réchauffage (2) est disposée comme un ajustement avec serrage dans un alésage interne d'un boîtier cylindrique (20) pour y être fixée, caractérisée en ce que
    le boîtier (20, 120) a un diamètre interne (D1) dans une région (24b) où la gaine (12) est disposée comme un ajustement avec serrage qui est supérieur au diamètre interne (D2) d'une ouverture (24e) dans le boîtier (20, 120) à travers laquelle la gaine (12) se projette.
  2. Bougie de préchauffage pour un moteur diesel selon la revendication 1 où le boîtier (120) comprend un corps (120A) dans lequel la gaine (12) est disposée comme un ajustement avec serrage et y est fixée, et un adaptateur de siège (120B) monté sur l'extrémité avant du corps et ayant une zone de siège (126) qui doit être disposée en butée contre la tête de cylindre.
  3. Bougie de préchauffage pour un moteur diesel selon la revendication 1 ou 2 où la gaine (12) est formée avec une portion d'un diamètre réduit (12a) à son extrémité distale et est formée avec une portion d'un diamètre agrandi (12b) vers l'extrémité arrière qui est fixée à la surface interne du boîtier (120), la portion d'un diamètre réduit (12a) se projetant à travers une ouverture dans le boîtier.
  4. Procédé de fabrication d'une bougie de préchauffage pour un moteur diesel où une extrémité d'une gaine (12) portant un dispositif de réchauffage (2) est disposée comme un ajustement avec serrage dans un alésage interne d'un boîtier cylindrique (20) pour y être fixée;
    comprenant les étapes de
    insérer une gaine (12) ayant une diamètre réduit (12a) vers son extrémité avant et un diamètre agrandi (12b) vers une extrémité arrière à travers une extrémité vers l'avant du boîtier cylindrique (20);
    disposer l'extrémité arrière de la gaine (12) comme un ajustement avec serrage dans le boîtier (20) la fixant ainsi à la surface interne du boîtier (20);
    et soumettre la portion avant du boîtier (20) à une déformation plastique de manière à s'étendre le long d'une jonction entre la portion d'un diamètre réduit (12a) et la portion d'un diamètre agrandi (12b) de la gaine (12), augmentant ainsi l'aire d'une zone de siège (26) située à l'extrémité avant du boîtier (20).
EP20020017728 2001-11-01 2002-08-08 Bougie d'allumage à incandescence pour moteurs diesel et son procédé de fabrication Expired - Lifetime EP1308672B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001336796 2001-11-01
JP2001336796A JP3661632B2 (ja) 2001-11-01 2001-11-01 ディーゼルエンジン用グロープラグの製造方法

Publications (3)

Publication Number Publication Date
EP1308672A2 EP1308672A2 (fr) 2003-05-07
EP1308672A3 EP1308672A3 (fr) 2006-08-30
EP1308672B1 true EP1308672B1 (fr) 2007-12-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020017728 Expired - Lifetime EP1308672B1 (fr) 2001-11-01 2002-08-08 Bougie d'allumage à incandescence pour moteurs diesel et son procédé de fabrication

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EP (1) EP1308672B1 (fr)
JP (1) JP3661632B2 (fr)
DE (1) DE60223985T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
KR100869713B1 (ko) * 2007-08-10 2008-11-21 주식회사 유라테크 글로우 플러그용 하우징 제조방법, 글로우 플러그용하우징, 및 글로우 플러그
JP5280877B2 (ja) * 2009-02-03 2013-09-04 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
JP2013228123A (ja) * 2012-04-25 2013-11-07 Ngk Spark Plug Co Ltd グロープラグ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6446520A (en) * 1987-08-12 1989-02-21 Nippon Denso Co Resistance device for preheating plug of diesel engine
JP2745225B2 (ja) * 1989-02-15 1998-04-28 自動車機器株式会社 デイーゼルエンジン用グロープラグ

Also Published As

Publication number Publication date
JP3661632B2 (ja) 2005-06-15
EP1308672A2 (fr) 2003-05-07
EP1308672A3 (fr) 2006-08-30
DE60223985D1 (de) 2008-01-24
DE60223985T2 (de) 2008-12-04
JP2003139323A (ja) 2003-05-14

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