WO2003052323A1 - Bougie de prechauffage pour moteur diesel et procede de fabrication de ladite bougie de prechauffage - Google Patents

Bougie de prechauffage pour moteur diesel et procede de fabrication de ladite bougie de prechauffage Download PDF

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Publication number
WO2003052323A1
WO2003052323A1 PCT/JP2002/011146 JP0211146W WO03052323A1 WO 2003052323 A1 WO2003052323 A1 WO 2003052323A1 JP 0211146 W JP0211146 W JP 0211146W WO 03052323 A1 WO03052323 A1 WO 03052323A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
sheath
glow plug
diesel engine
heater
Prior art date
Application number
PCT/JP2002/011146
Other languages
English (en)
Japanese (ja)
Inventor
Arihito Tanaka
Takashi Aota
Jian Zhao
Toshitsugu Miura
Original Assignee
Bosch Automotive Systems Corporation
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 Automotive Systems Corporation filed Critical Bosch Automotive Systems Corporation
Priority to EP02805013A priority Critical patent/EP1457736A1/fr
Publication of WO2003052323A1 publication Critical patent/WO2003052323A1/fr

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Classifications

    • 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/028—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs the glow plug being combined with or used as a sensor
    • 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
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means
    • 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
    • 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 glow plug used for assisting starting of a diesel engine, and in particular, relates to a sheath holding a heater and a cylinder head of the engine.
  • the present invention relates to a glow plug for a diesel engine, which is characterized in that it is fixed to a housing, which is a mounting bracket for the diesel engine, and a method for manufacturing the glove lug for a diesel engine.
  • a glow plug for a diesel engine holds a heater in a metal sheath, and inserts one end of the sheath into a front end of a mounting bracket (a cylindrical housing) to an engine cylinder head. While electrically connecting one electrode of the heater to the sheath and extracting the other electrode to the outside through an electrode extraction metal fitting, and fixing the other electrode to the other end of the housing via an insulator. It is configured to be electrically connected to the external connection terminal.
  • the sheath When the sheath is fixed to the housing by press-fitting, it is necessary to process the inner diameter of the portion of the inner surface of the housing into which the sheath is press-fitted and the length of the press-fitted portion with high precision. Since the internal holes are processed, there is a problem that the processing cost of the housing is extremely high. Further, in order to change the distance from the front end of the heater to the seat surface to the cylinder head formed at the front end of the housing according to the required performance, the press-fitted portion of the housing internal hole should be removed. Since they must be formed at different positions, it is necessary to manufacture various kinds of housings according to each specification, which is costly.
  • An object of the present invention is to provide a glow plug for a diesel engine having a strong holding force and a method for manufacturing the same.
  • the glow plug for a diesel engine according to the invention described in claim 1 is one in which one end of a sheath holding a heater is inserted and fixed into an inner hole of a cylindrical housing. Plastic working from the outer surface of the inner surface An annular projection formed on the outer surface of the sheath and an annular recess formed on the outer surface of the sheath via the housing by the plastic working are fitted to each other, and the housing and the sheath are fixed. Is what you do.
  • the sheath may move in the axial direction of the housing. There is no danger of getting inside the housing or getting out of the housing. In addition, there is no risk of misalignment between the housing and the sheath. In addition, since there is no need to perform high-precision machining of the internal hole of the housing, machining of the housing is inexpensive.
  • the invention according to claim 2 is characterized in that the annular convex portion and the annular concave portion formed by the plastic working are formed of a surface parallel to the axis of the housing.
  • the invention according to claim 3 is characterized in that the annular convex portion and the annular concave portion formed by the plastic working are constituted by surfaces inclined with respect to the axis of the housing.
  • the diameter of the annular convex portion and the annular concave portion is continuously changed from the large diameter portion to the small diameter portion, so that the annular convex portion and the annular concave portion have the same diameter over the entire length in the axial direction. Also, it is easy to maintain the airtightness between the housing and the sheath.
  • the invention according to claim 4 is characterized in that a plurality of annular convex portions and annular concave portions formed by the plastic working are provided in an axial direction.
  • the invention according to claim 5 is a method for manufacturing a glow plug for diesel engine in which one end of a sheath holding a heater is inserted and fixed into an internal hole of a cylindrical housing, and After inserting one end of the sheath into the inner hole and positioning the distal end of the heater held by the sheath and the seat surface to the cylinder head provided in the housing, the sheath is positioned on the outer peripheral surface of the housing.
  • An annular convex portion is formed on the inner surface of the housing by performing plastic working, and an annular concave portion is formed on the outer surface of the sheath so that the annular convex portion is fitted to fix the sheath to the housing. It is.
  • plastic working of the manufactured diesel engine glow plug is performed.
  • the annular convex portion of the housing and the annular concave portion of the sheath are firmly engaged with each other, so that the sheath does not move in the axial direction of the housing, and there is no risk of misalignment.
  • machining of the housing is low in cost.
  • the distance between the tip of the heater and the seat surface of the housing can be set arbitrarily.
  • the seat surface of the housing is formed at the same time, so that the dimensional accuracy from the front end of the heater to the seat surface of the housing can be further improved.
  • the glow plug for a diesel engine manufactured by the method of the present invention has an insulator interposed between the inner surface of the housing and the outer surface of the sheath, and these are fixed in an insulated state. Can be used.
  • FIG. 3 is an enlarged view of a main part (A in FIG. 1) of the diesel engine glow plug.
  • FIG. 2 is a longitudinal sectional view for explaining an assembling process of the diesel engine glow plug.
  • FIG. 4 is a longitudinal sectional view showing a step subsequent to FIG.
  • FIG. 5 is a longitudinal sectional view showing a step subsequent to FIG. 4.
  • FIG. 7 is a longitudinal sectional view of a glow plug for a diesel engine according to a second embodiment.
  • FIG. 9 is a longitudinal sectional view for explaining a process of assembling a global plug for diesel engine according to a second embodiment.
  • FIG. 8 is a longitudinal sectional view illustrating a step subsequent to FIG. 7.
  • FIG. 8 is a circuit diagram showing an operation electric circuit of a glow plug for a diesel engine according to a second embodiment.
  • FIG. 1 is a vertical cross-sectional view of a glow plug for a diesel engine (indicated by reference numeral 1) according to an embodiment of the present invention
  • FIG. 2 is an enlarged view of a main part (A part in FIG. 1).
  • the green plug 1 of this embodiment is a ceramic green plug using a ceramic glass 2 as a heating element.
  • the ceramic heater 2 has a well-known structure and its details are not shown.
  • a heating wire made of a refractory metal such as tungsten (W) in a coil shape is formed inside a ceramic insulator constituting a main body.
  • the heating wire has one end connected to the negative lead wire and the other end connected to the positive lead wire.
  • the lead wire on the negative electrode side is taken out from the outer peripheral surface of the ceramic insulator, and is joined to the inner surface of a sheath (metal outer cylinder) 4 described later by brazing to be electrically connected.
  • the positive lead wire extends to the end opposite to the position where the heating wire is buried (the left end in Fig. 1), and within the mounting hole 2b formed on this end surface, the tip of the electrode extraction metal fitting 6 It is electrically connected to the section by brazing. Further, the rear end of the electrode extraction fitting 6 is fixed to the front end of the external connection terminal 8.
  • a ceramic housing 2 having the above-described configuration is joined to a sheath (metal outer cylinder) 4 by brazing, and is a mounting bracket to a cylinder head via the metal outer cylinder 4.
  • the metal outer cylinder 4 has a slightly smaller diameter at the distal end portion 4a and a larger diameter at the rear portion 4b side, and a rear portion of the ceramic heater 2 inside the small diameter portion 4a. Are inserted and joined by brazing or the like.
  • the housing 10 has a seat surface 10a at the front end (the left end in FIG. 1) to the cylinder head of the engine, and a screw portion 10b to the cylinder head at the rear side. Further, a nut portion 10c for fastening is formed at the rear end.
  • an external connection terminal 8 electrically connected to a positive lead wire of the ceramics heater 2 via an electrode extraction fitting 6 is fixed in a metal outer cylinder 4 by swaging.
  • a process of fixing the external connection terminal 8 by this swaging will be briefly described.
  • the electrode take-out fitting 6 is inserted into the mounting hole 2b of the ceramic heat sink 2, and the electrode take-out fitting 6 and the ceramic heat sink 2 are inserted.
  • the ceramics heater 2 is fixed by brazing to the end of the metal outer cylinder 4 closer to the ceramic heater fixing side (the end on the small diameter portion 4a side). At this time, it is a matter of course that the heating portion 2 a in which the heating wire near the tip of the ceramic heater 2 is embedded is exposed outside the metal outer cylinder 4.
  • the ceramic heater 2 After fixing the ceramic heater 2 in the small-diameter portion 4 a of the metal outer cylinder 4, insert the tip of the external connection terminal 8 from the opening 4 c on the large-diameter portion 4 b side of the metal outer cylinder 4. Connect to the other end of the electrode take-out bracket 6. Thereafter, the heat-resistant insulating powder (for example, magnesia (MgO)) is introduced from the opening 4 c of the metal outer cylinder 4 into the space in which the connection between the electrode extraction fitting 6 and the external connection terminal 8 is accommodated. Etc.) Fill 1 and 2. Next, a rubber sealing member (silicon rubber, fluorine rubber, etc.) 14 is attached to the opening 4 c of the metal outer cylinder 4.
  • MgO magnesia
  • the outer diameter of the metal outer cylinder 4 is reduced by swaging the large-diameter portion 4 b of the metal outer cylinder 4 that houses the connection between the electrode extraction fitting 6 and the external connection terminal 8.
  • the external connection terminal 8 is fixed in the metal outer cylinder 4 by increasing the density of the heat-resistant insulating powder 1 2
  • the metal outer cylinder 4 to which the ceramic heater 2, the electrode extraction metal fitting 6, and the external connection terminal 8 are fixed has a large-diameter portion 4 b on the rear side inserted and fixed in a cylindrical housing 10.
  • the portion slightly before the distal end of the housing 10 is located on the outer periphery of the large-diameter portion 4b of the metal outer cylinder 4 near the small-diameter portion 4a. Is swaged from the outside of the housing 10 (the swaged portion is indicated by the symbol S), and an annular convex portion 10d is formed on the inner peripheral side (part A in FIG. 1).
  • This swaging process also forms an annular concave portion 4c on the outer peripheral surface of the metal outer cylinder 4 at the same time, and these annular convex portions 10d of the housing 10 and The annular concave portion 4c of the metal outer cylinder 4 is fitted with each other.
  • the annular projection 10 d formed by swaging and the annular The fitting and close contact of the recesses 4 c secure the housing 10 and the metal outer cylinder 4 and maintain airtightness.
  • the housing 10 and the metal outer cylinder 4 are fixed by swaging from the outer peripheral side of the housing 10 so that the housing 10 and the metal outer cylinder 4 are completely adhered to each other. Therefore, there is no possibility that both of them are misaligned. Further, airtightness between the housing 10 and the metal outer cylinder 4 is reliably maintained.
  • the annular convex portion 10d and the annular concave portion 4c are engaged with each other, the holding force in the axial direction is strong, and the ceramic heater 2 held by the metal outer cylinder 4 has the housing 10 Without getting out of the housing or getting inside the housing 10.
  • the assembly consisting of the ceramic heater 2, the electrode extraction metal fitting 6, and the external connection terminal 8 fixed in the metal outer cylinder 4 is attached to the tip of the housing 10 with the screw 8a side of the external connection terminal 8 first. (Seat surface 10a side to cylinder head) and insert into internal hole 16 (see Fig. 3). Before the housing 10 is assembled, the entire inner hole 16 has an inner diameter large enough to allow the large-diameter portion 4b of the metal outer cylinder 4 to pass therethrough.
  • the external connection terminal 8 is inserted from the screw portion 8 a side into the internal hole 16 of the housing 10, and the large-diameter portion 4 b side of the metal outer cylinder 4 is also inside the internal hole 16 of the housing 10.
  • a seat surface 10a to the cylinder head of the engine is formed, and a distance L1 between the seat surface 10a and the end of the ceramic heater 2 has a predetermined size. (See Figure 4).
  • swaging is performed from the outer peripheral side to a portion slightly before the front end portion of the housing 10 (see reference numeral S in FIG. 5).
  • the outer peripheral surface of the housing 10 is recessed, and an annular convex portion 10d is formed on the inner surface side. Further, through the plastic deformation of the housing 10, an annular concave portion 4c is also formed on the outer surface side of the metal outer cylinder 4. By this swaging, the housing 10 and the metal outer cylinder 4 are firmly adhered and joined.
  • the internal hole 16 of the housing 10 may have an inner diameter slightly larger than the outer diameter of the metal outer cylinder 4 so that the large-diameter portion 4b of the outer cylinder 4 can pass through. Since high precision is not required, processing can be performed at extremely low cost as compared with the case of fixing by press fitting. Further, the distance L 1 between the seat surface 10 a of the housing 10 and the tip of the ceramic heater 2 can be set arbitrarily at the time of joining, so that the housing 10 having one type of dimension and the ceramic heater 2 provide Glow plugs 1 of various performances can be manufactured, and the cost is extremely low. Furthermore, unlike the case of fixing by press-fitting, there is no risk of damaging the ceramic heater 2.
  • the housing 10 and the metal outer cylinder 4 are simultaneously deformed by swaging from the outer peripheral surface of the housing 10 to fix both of them.
  • the annular convex portion 10d and the annular concave portion 4c to be fitted to each other may be formed in the housing 10 and the metal outer cylinder 4 by other plastic working such as rolling.
  • a housing having an internal hole was manufactured by cutting a solid steel material, but in this embodiment, the internal hole 16 of the housing 10 is not required to be processed with high precision.
  • the portion deformed by the plastic working is constituted by a surface parallel to the axis of the housing 10, that is, the swaged portion S is the housing 10.
  • the housing 10 Have the same diameter over the longitudinal direction.
  • the annular convex portion 10a and the annular concave portion 4c are not limited to those having the same diameter over the longitudinal direction as described above. Alternatively, it may be constituted by an inclined surface.
  • a seat surface 10a for mounting to the cylinder head of the engine is formed at the end of the housing 10, but only when the housing 10 is formed in advance in the housing 10 as in the above embodiment. Instead, when the housing 10 and the metal outer cylinder 4 are fixed by plastic processing such as swaging or rolling, the sheet surface 10a can be formed at the same time. By simultaneously forming the seat surface 10a of the housing 10 in this manner, the dimensional accuracy between the tip of the ceramic heater 2 and the seat surface 10a of the housing 10 can be improved. Furthermore, by connecting the plastically processed part of the outer periphery of the housing 10 and the adjacent part with a smooth R shape, the protection for the housing 10 is prevented from peeling off when performing swaging. can do.
  • the metal outer cylinder 4 is filled with the heat-resistant insulating powder 12, and the external connection terminal 8 connected to the electrode extraction bracket 6 is swaged to form the metal outer cylinder 4.
  • the external connection terminal 8 connected to the electrode extraction bracket 6 is swaged to form the metal outer cylinder 4.
  • it is fixed it is also possible to omit this swaging step and also to perform swaging processing for fixing the housing 10 and the metal outer cylinder 4.
  • airtightness is not required, and it is only necessary to securely fix the positive electrode, so that the swaging step can be omitted and the cost can be further reduced.
  • FIG. 6 is a longitudinal sectional view showing a diesel engine glow plug 101 according to the second embodiment.
  • the glow plug 101 is similar to the diesel engine glow plug 1 having the above-described configuration. It integrates an ion sensor that detects the ion current and detects the combustion state of the engine.
  • a heating element 102b is embedded in a ceramic insulator 102a, a negative lead wire 102c at one end thereof, Positive lead wires 102d are connected to the other ends, respectively.
  • This heating element 102b has a tip 102ba exposed to the outside of the ceramic insulator 102a in order to be used also as an electrode for ion detection.
  • the lead wire 102 c on the negative electrode side is taken out from the side surface of the ceramic insulator 102 a and is electrically connected to the inner surface of the sheath (metal outer cylinder) 104.
  • the reference numeral 02 d is electrically connected to one end of the electrode extraction metal fitting 106 inside the ceramic insulator 102 a. Further, the other end of the electrode extraction metal fitting 106 is connected to an external connection terminal 108.
  • the metal outer cylinder 104 to which the ceramic heater 102 is fixed has a longer overall length than the housing 110, and In a state where the ceramic heater 102 is fixed to 0, the end 104 e opposite to the tip 104 d to which the ceramic heater 102 is fixed has reached the rear end of the housing 110.
  • the inside of the metal outer cylinder 104 is filled with heat-resistant insulating powder 112, Density is increased by aging to fix the external connection terminal 108 and insulate the external connection terminal 108 on the positive electrode side from the metal outer cylinder 104 on the negative electrode side.
  • a metal outer cylinder 104 having a ceramic heater 102 fixed to one end 104 d and an external connection terminal 108 extending to the other end 104 e is a cylindrical housing. It is inserted into the internal hole 1 16 of 110 and fixed. An insulator 118 is inserted between the inner surface of the housing 110 near the tip and the outer surface of the metal outer cylinder 104, and the housing 110 and the metal outer cylinder 1 are inserted. 04 is electrically insulated. In this embodiment, the portion filled with the insulator 118 is swaged from the outer peripheral side of the housing 110 (see reference symbol S in FIG. 6), and an annular convex is formed on the inner peripheral side. A part 110d is formed, and the metal outer cylinder 104 is fixed to the housing 110 at the swaged part S.
  • the process of assembling the ion sensor body type plug 101 will be described with reference to FIGS. 6, 7 and 8 described above.
  • the assembly including the ceramic ceramic holder 102 held in the metal outer cylinder 104, the electrode extraction metal fitting 106 and the external connection terminal 108 was connected to the external connection terminal 108. Insert the threaded part from the end of the housing 110 (the end on the side where the ceramics is mounted 102) with the threaded part 108a first (see Fig. 7).
  • the housing A seal member 120 is attached between the tip of 110 and the outer peripheral surface of the metal outer cylinder 104, and heat-resistant insulating powder 118 is further applied from the rear opening side of the housing 110.
  • seal members 122 are fitted (see FIG. 8).
  • the outer peripheral side of the portion filled with the heat-resistant insulating powder 118 is swaged to plastically deform the housing 110, and an annular convex portion 110d is formed on the inner peripheral surface thereof. Densify the heat-resistant powder 1 18 and fix the metal outer cylinder 104
  • the ion sensor body type plug 101 is provided with a metal outer cylinder 104 electrically connected to a negative electrode lead wire 102 c of a ceramic heater 102, and a rear end portion of a housing 110. Side is connected to the negative terminal 1 2 4 and is connected to the positive lead 10 2 d.
  • the external connection terminal 108 electrically connected via the pole extraction bracket 106 is connected to the positive electrode side terminal 126.
  • An insulating ring 128 is interposed between the negative electrode terminal 124 electrically connected to the metal outer cylinder 104 and the housing 110.
  • An insulator 130 is interposed between the positive electrode terminal 126 and the positive electrode terminal 126 to be electrically insulated.
  • the positive terminal 1 26 is connected to the positive side of the battery 13 2 via a first relay 13 A, and the negative terminal 12 4 is connected to the battery 13. 2 is connected to the minus side via a second relay 134B. Therefore, the positive pole of the battery 13, the first relay 13 A, the positive terminal 12 6, the external connection terminal 10 8, the electrode extraction fitting 10 6, and the positive lead wire of the ceramic heater 10 2 102 d, heating element 102 b, negative lead wire 102 c, metal outer cylinder 104, negative terminal 1 24, second relay 1 3 4 B and battery 1 3 2 The negative pole forms a globe-lag electrical circuit.
  • the housing 110 is fixed to a cylinder head 1336 of the engine.
  • the negative pole of the battery 1332 is grounded to the cylinder head 1336, and the battery 13
  • the positive electrode 2 and the positive terminal 1 26 of the green plug 101 are connected via current detecting means 1 38 and a sensor relay 140. Therefore, the positive pole of the battery 13 2, the current detection means 1 38 and the sensor relay 140, the positive terminal 1 26, the external connection terminal 108, the electrode extraction bracket 106 and the ion
  • the electric circuit of the ion sensor is formed by the heating element 102 b as the detection electrode and the earth of the cylinder head 1 36.
  • the first and second relays 1334 A and 1348 for the glow plug are set to 0 N and Turn off the sensor relay 140. Then, an electric current flows through the electric circuit for the glow plug, and the heating element 102b generates heat, thereby preheating the engine.
  • the glow plug 101 of the above configuration functions as an ion sensor, turn off the glow plug relays 134 A and 134 B and turn on the ion sensor relay 140. I do. Then, the ceramic electrode as an electrode for ion detection A voltage is applied between the heating element 102 b of the night 102 and the cylinder head 136, and a current flows through the sensor electric circuit due to ions in the combustion chamber generated when the engine is burning. This current is detected by the current detecting means 138, and feedback control of the engine is performed.
  • the structure of the housing 110 is simplified, so that the housing 110 can be manufactured at low cost. Can be. Also, without changing the shape of the housing 110, the distance L2 between the seat surface 110a to the cylinder head 13 6 of the housing 110 and the tip of the ceramic heater 102 Can be set arbitrarily, and cost can be significantly reduced.
  • the insulator interposed between the housing 110 and the metal outer cylinder 104 is limited to the above-described heat-insulated insulating powder 118 densified by swaging. Instead, for example, other insulators such as resin can be used.
  • the ceramic heater-type glow plugs 1 and 101 using the ceramic heaters 2 and 102 as heating elements have been described.
  • the present invention is not limited to the ceramic heaters. It is also possible to apply the present invention to a glow plug using a heater made of.

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

Abstract

L'invention concerne une bougie de préchauffage pour moteur diesel, dans laquelle une extrémité d'un élément de chauffe en céramique (2) est fixée à une extrémité d'un tube extérieur métallique (4) et le pôle négatif de cet élément de chauffe (2) est relié électriquement à ce tube extérieur métallique (4). Le pôle positif de ce tube est relié à une borne de connexion extérieure (8) par l'intermédiaire d'un extracteur d'électrode (6). Le tube extérieur métallique (4) pourvu de l'élément de chauffe (2) et la borne de connexion extérieure (8) située à l'intérieur du tube sont insérés dans l'orifice interne (16) d'un culot (10). Une fois que l'extrémité de l'élément de chauffe (2) est positionnée par rapport à la surface de siège (10a) du culot (10), le sertissage est effectué à partir du côté périphérique extérieur du culot (10). Une partie saillante annulaire (10d) est formée sur la surface périphérique intérieure du culot (10) et une partie évidée annulaire (4c), adaptée à la partie saillante annulaire (10d), est formée en parallèle dans la surface périphérique extérieure du tube extérieur métallique (4), lequel tube extérieur métallique (4) supportant l'élément de chauffe (2) peut être solidarisé au culot (10). Une réduction de coût peut être obtenue puisqu'une haute précision n'est pas requise pour le diamètre intérieur du culot (10).
PCT/JP2002/011146 2001-12-18 2002-10-28 Bougie de prechauffage pour moteur diesel et procede de fabrication de ladite bougie de prechauffage WO2003052323A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02805013A EP1457736A1 (fr) 2001-12-18 2002-10-28 Bougie de prechauffage pour moteur diesel et procede de fabrication de ladite bougie de prechauffage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001/384690 2001-12-18
JP2001384690A JP2003185137A (ja) 2001-12-18 2001-12-18 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

Publications (1)

Publication Number Publication Date
WO2003052323A1 true WO2003052323A1 (fr) 2003-06-26

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PCT/JP2002/011146 WO2003052323A1 (fr) 2001-12-18 2002-10-28 Bougie de prechauffage pour moteur diesel et procede de fabrication de ladite bougie de prechauffage

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EP (1) EP1457736A1 (fr)
JP (1) JP2003185137A (fr)
CN (1) CN1292196C (fr)
WO (1) WO2003052323A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005021229A1 (de) * 2005-05-09 2006-11-16 Robert Bosch Gmbh Glühstiftkerze mit Brennraumdrucksensor
DE102006016566B4 (de) 2005-09-22 2008-06-12 Beru Ag Zusammengesetzter Leiter, insbesondere für Glühkerzen für Dieselmotoren
JP5102530B2 (ja) * 2006-05-19 2012-12-19 日本特殊陶業株式会社 グロープラグ及びその製造方法
JP4843430B2 (ja) * 2006-09-12 2011-12-21 日本特殊陶業株式会社 グロープラグの製造方法
KR101441595B1 (ko) * 2007-02-22 2014-09-19 쿄세라 코포레이션 세라믹 히터, 이 세라믹 히터를 이용한 글로 플러그 및 세라믹 히터의 제조 방법
KR100915939B1 (ko) * 2007-10-10 2009-09-11 주식회사 유라테크 글로우 플러그의 하우징 제조방법
WO2012140892A1 (fr) * 2011-04-15 2012-10-18 日本特殊陶業株式会社 Bougie à incandescence
JP5965179B2 (ja) * 2012-03-29 2016-08-03 日本特殊陶業株式会社 グロープラグ及びその製造方法
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DE102014220036A1 (de) * 2014-10-02 2016-04-07 Robert Bosch Gmbh Glühstiftkerze
JP2021021518A (ja) * 2019-07-25 2021-02-18 ボッシュ株式会社 セラミックスヒータ型グロープラグおよびその製造方法

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JPS5740866U (fr) * 1980-08-12 1982-03-05
JPS5822A (ja) * 1981-06-24 1983-01-05 Ngk Spark Plug Co Ltd シ−ズ型グロ−プラグの取付金具にグロ−チュ−ブを接合する方法
EP1055878A2 (fr) * 1999-05-27 2000-11-29 Denso Corporation Bougie à incandescence et son procédé de fabrication
JP2001108236A (ja) * 1999-10-07 2001-04-20 Ngk Spark Plug Co Ltd シーズ封入型電子機器の製造方法

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