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EP1328138B1 - Bougie de prechauffage en ceramique et procede de production de cette derniere - Google Patents

Bougie de prechauffage en ceramique et procede de production de cette derniere Download PDF

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Publication number
EP1328138B1
EP1328138B1 EP01976690.6A EP01976690A EP1328138B1 EP 1328138 B1 EP1328138 B1 EP 1328138B1 EP 01976690 A EP01976690 A EP 01976690A EP 1328138 B1 EP1328138 B1 EP 1328138B1
Authority
EP
European Patent Office
Prior art keywords
lead wire
ceramics heater
outer sleeve
metallic outer
electrode fitting
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
EP01976690.6A
Other languages
German (de)
English (en)
Other versions
EP1328138A1 (fr
EP1328138A4 (fr
Inventor
Arihito C/O BOSCH AUTOMOTIVE SYST. CORP. TANAKA
Takashi C/O BOSCH AUTOMOTIVE SYST. CORP. AOTA
Jian C/O BOSCH AUTOMOTIVE SYST. CORP. ZHAO
Toshitsugu C/O BOSCH AUTOMOTIVE SYST.CORP. MIURA
Hitoshi C/O BOSCH AUTOMOTIVE SYST.CORP. SUGIMOTO
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 Automotive Systems Corp
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Filing date
Publication date
Application filed by Bosch Automotive Systems Corp filed Critical Bosch Automotive Systems Corp
Publication of EP1328138A1 publication Critical patent/EP1328138A1/fr
Publication of EP1328138A4 publication Critical patent/EP1328138A4/fr
Application granted granted Critical
Publication of EP1328138B1 publication Critical patent/EP1328138B1/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
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • 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
    • 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 which is used as a starting aid for a diesel engine, and in particular, to a ceramics heater glow plug which uses a ceramics heater as a heating element and a method of manufacturing same.
  • a ceramics heater is known in the art which includes a heating element formed by a coil of high melting metal (such as tungsten) or a conductive ceramics material or a film shaped heating element embedded in an insulating ceramics material.
  • the conductive ceramics material is used as the heating element, it is partly exposed outside the insulating ceramics so that a lead wire connected to the negative electrode of the heating element can be taken out through the side of the insulating ceramics material for connection with a metallic outer sleeve, while a lead wire connected to the positive electrode of the heating element is taken out through an end face of the insulating ceramics material which is located remote from the heating element for connection with one end of an electrode fitting, the other end of which is connected to an external connection terminal.
  • a mounting hole is opened into the end face of the insulating ceramics material so that the lead wire can be connected with the heating element within the mounting hole
  • the size of the mounting hole is limited, preventing the diameter of the lead wire from being increased and also preventing the lead wire from being formed with a sufficient rigidity.
  • the connection between the lead wire and the heating element on the end face of the ceramics heater it is difficult to achieve a sufficient strength for the connection. It will be seen that the insulating ceramics material is brittle in nature and cannot stand an increased force applied.
  • the resulting construction be capable of withstanding vibrations of an engine, again resulting in a tendency toward an increased size of the construction which fixes the electrode fitting or the external connection terminal.
  • the electrode fitting With a sheath heater which is extensively used in the art for a heating element of a glow plug for a diesel engine, the electrode fitting is swaged to be secured within the sheath so that the electrode fitting provides a strength which resists a tightening torque applied to the external connection terminal or vibrations of an engine.
  • the ceramics heater As mentioned above, there remains a problem in securing the required strength because the lead wire which is taken out of the end face of the ceramics heater is reduced in diameter.
  • the present invention has been made to solve such problems, and has for its object the provision of a glow plug including a ceramics heater having a simplified construction which supports the lead wire taken out from the end face of the ceramics heater and the electrode fitting connected to the lead wire with respect to the housing while securing a sufficient strength to resist the tightening torque applied to the external connection terminal and vibrations of an engine.
  • a ceramics heater glow plug having the features defined in the preamble of claim 1 is known from JP-A-2000-121055 .
  • a ceramics heater glow plug according to the present invention comprises the features of claim 1.
  • the lead wire extending from the electrode of the heating element and the electrode fitting are secured to the metallic outer sleeve through the interposed insulator, allowing the electrode fitting to be insulated in a reliable manner and simplifying the construction which support them with respect to the housing and thus reducing the manufacturing cost.
  • the tightening torque applied to the external connection terminal is transmitted to a region of the housing where the metallic outer sleeve is disposed as a press fit through the interposed electrode fitting which is formed as a rigid body, thus allowing the construction which fixes the external connection terminal to be simplified.
  • the ceramics heater glow plug can be constructed in substantially identical manner as a sheath glow plug, allowing parts and an assembling equipment to be used in common to reduce the manufacturing cost.
  • the invention defined in Claim 2 is characterized in that in the arrangement of the invention defined in Claim 1, an insertion opening is formed in the end face of the electrode fitting to receive one end of the lead wire for purpose of connection therewith.
  • the invention defined in Claim 3 is characterized in that in the arrangement of the invention defined in Claim 2, the insertion opening comprises an through-opening axially extending through the electrode fitting to receive the lead wire, and the outer periphery of the electrode fitting is subject to a plastic deformation for connection with the lead wire.
  • the invention defined in Claim 4 is characterized in that in the arrangement of the invention defined in Claim 1, a lateral surface of the lead wire at its distal end is disposed in abutment against a lateral surface of the electrode fitting at the distal end thereof for purpose of connection therebetween.
  • the invention defined in Claim 5 is characterized in that in the arrangement of the invention defined in Claim 4, the distal end of the electrode fitting is formed with a step, against which the lateral surface of the lead wire at its distal end abuts for purpose of connection therebetween.
  • the invention defined in Claim 6 is characterized in that in the arrangement of the invention defined in Claim 1, a connection member is used to connect between the lead wire and the electrode fitting.
  • the invention defined in Claim 7 is characterized in that in the arrangement of the invention defined in Claim 1, a hollow pipe member is used as the lead wire extending from the electrode of the heating element.
  • the invention defined in Claim 8 is characterized in that in the arrangement of the invention defined in Claim 1, a slitted hollow pipe member is used as the lead wire extending from the electrode of the heating element.
  • the invention defined in Claim 9 is characterized in that in the arrangement of either invention defined in Claim 1, 7 or 8, the distal end of the lead wire is coiled, and the distal end of the electrode fitting is inserted into the coiled end for purpose of connection therebetween.
  • the invention defined in Claim 10 is characterized in that in the arrangement of the invention defined in either Claim 7 or 8, the hollow pipe member which is used as a lead wire is formed at its end with a cup-shaped juncture, into which the distal end of the electrode fitting fits.
  • the invention defined in Claim 10 permits the electrode fitting and the lead wire to be connected together in a simple and reliable manner from outside the metallic outer sleeve, in addition to the advantages achieved by the inventions defined in Claims 7 and 8.
  • the invention defined in Claim 11 is characterized in that in the arrangement of the invention defined either one of Claims 1, 7 and 8, the end of the lead wire extending from the electrode of the heating element is helically coiled, while the distal end of the electrode fitting is formed with a plurality of steps, which are engaged with an unevenness in the helical coil to achieve a connection therebetween.
  • the invention defined in Claim 12 is characterized in that in the arrangement of the invention defined in either Claim 7 or 8, the end of the lead wire extending from the electrode of the heating element is helically coiled, while the distal end of the electrode fitting is threaded for threadable engagement with the helical coil to provide a connection therebetween.
  • the inventions defined in Claims 11 and 12 allow the electrode fitting and the lead wire extending from the electrode of the heating element to be connected together in a reliable manner while preventing a disengagement therebetween, thus achieving a reliable electrical connection.
  • the invention defined in Claim 13 is characterized in that in the arrangement of the ceramics heater glow plug according to one of the above Claims, an elastic seal member is fitted into an opening formed in the metallic outer sleeve which is located toward the electrode.
  • the invention defined in Claim 14 is characterized in that in the ceramics heater glow plug according to one of the above Claims, the metallic outer sleeve comprises a stepped pipe including a portion of a reduced diameter and another portion of a greater diameter, and an end face of the ceramics heater which is located within the metallic outer sleeve is disposed within the portion of a greater diameter.
  • the invention defined in Claim 15 relates to a method of manufacturing a ceramics heater according to one of the above Claims, comprising the sequential steps of connecting a lead wire which projects from the end face of the ceramics heater with the electrode fitting, securing the ceramics heater in one end of the metallic outer sleeve, filling a refractory insulating powder into the other end of the metallic outer sleeve, and subjecting the outer periphery of the metallic sleeve in which the lead wire and the electrode fitting are contained to a swaging operation to reduce the diameter thereof, thereby securing the electrode fitting to the metallic outer sleeve.
  • the invention defined in Claim 16 relates to a method of manufacturing a ceramics heater according to one of the above Claims, comprising the sequential steps of securing the ceramics heater in one end of the metallic outer sleeve, connecting the lead wire projecting from an end face of the ceramics heater with the electrode fitting, filling a refractory insulating powder into the other end of the metallic outer sleeve, and subjecting the outer periphery of the metallic outer sleeve in which the lead wire and the electrode fitting are contained to a swaging operation to reduce the diameter thereof, thereby securing the electrode fitting to the metallic outer sleeve.
  • a portion of the metallic outer sleeve which is disposed as a press fit in a housing is formed by a swaging operation, and accordingly, a dimensional accuracy can be maintained to stabilize the press fit.
  • This permits a welding or caulking operation which is intended to connect between the lead wire extending from the electrode of the heating element and the electrode fitting to be dispensed with, thus improving the ease of assembly and productivity while reducing the manufacturing cost.
  • the invention defined in Claim 17 is characterized in that in the method defined in Claim 16, at the same time as the ceramics heater is secured in one end of the metallic outer sleeve, one end of the lead wire is connected to the ceramics heater.
  • the invention defined in Claim 18 is characterized in that in the manufacturing method mentioned above, a portion of the metallic outer sleeve which is subject to the swaging operation assumes an outer diameter before the swaging operation takes place which is greater than the outer diameter of a portion thereof where the ceramics heater is secured.
  • the invention defined in Claim 19 is characterized in that in the manufacturing method mentioned above, subsequent to the step of filling a refractory insulating powder into the other end of the metallic outer sleeve, an elastic seal member is fitted into an opening of the metallic'outer sleeve which is located toward the electrode fitting.
  • the invention defined in Claim 20 is characterized in that in the manufacturing method defined in either Claim 15 or 16, an end of the lead wire extending from the electrode of the heating element is helically coiled while the distal end of the electrode fitting is formed with a plurality of steps, and the electrode fitting is axially urged to drive the steps into the helical coil for engagement therebetween, thus achieving a connection therebetween.
  • the invention defined in Claim 21 is characterized in that in the manufacturing method defined in either Claim 15 or 16, an end of the lead wire extending from the electrode is helically coiled while the distal end of the electrode fitting is threaded, and the electrode fitting is rotated to cause the threads to be threadably engaged with the helical coil to provide a connection therebetween.
  • Fig. 1 is a longitudinal section of a ceramics heater glow plug according to one embodiment of the present invention.
  • the glow plug has a cylindrical housing 2 having an internal bore 4 which is a stepped axial bore including a portion of a medium diameter 4a which is located to the left and in which a ceramics heater is secured, a portion of a greater diameter 4c which is located to the right and in which an external connection terminal is secured, and a portion of a reduced diameter 4b which is disposed between the portions 4a and 4c.
  • a ceramics heater 6 is cemented, as by being disposed as a press fit or by brazure, to a metallic outer sleeve 8, which is in turn inserted into the portion 4a of a medium diameter of the internal bore 4 in the housing 2.
  • the outer periphery of the metallic outer sleeve 8 is partly secured to the housing 2 as by being disposed as a press fit or by brazure.
  • the ceramics heater 6 comprises a body which is formed by a ceramics insulating material in which a coil of a high melting material such as tungsten (W), for example, is embedded as a heating wire to provide a heating element 6a, which projects externally through a distal end 8b of the metallic outer sleeve 8.
  • An end face 6b of the ceramics heater 6 which is located remote from the heating element 6a is situated inside the metallic outer sleeve 8.
  • the heating element comprises a high melting metal, but it may be in the form of a heating element formed by conductive ceramics or a sheet-like heating element.
  • the ceramic heater 6 may be a composite structure of an insulating ceramics material and an inorganic conductor which serves as a heating element, as may be provided by exposing part of a heating element of conductive ceramics outside the insulating ceramics material.
  • a negative pole lead wire is connected to one end of the coiled heating wire which is embedded within the ceramics heater 6, while a positive pole lead wire is connected to the other end thereof.
  • the negative pole lead wire is exposed externally of the ceramics insulating material inside the metallic outer sleeve 8 and is electrically connected to the internal surface of the metallic outer sleeve 8 as by brazure.
  • the positive pole lead wire extends toward the end face 6b, and is connected to an electrode connection lead wire 10 within the end of the ceramics heater 6.
  • the electrode connection lead wire 10 which is taken out through the end face 6b of the ceramics heater 6 has a distal end 10a, which is connected to an electrode fitting 12 inside the metallic outer sleeve 8.
  • the electrode connection lead wire 10 is a wire of a reduced diameter, but the electrode fitting 12 comprises a rigid material.
  • the electrode fitting 12 has an end 12a, in which an insertion opening 12b (which will be described later with reference to Fig. 2 ) is formed, and the distal end 10a of the electrode connection lead wire 10 is inserted into the insertion opening 12b and is connected thereto as by brazing or by caulking the end 12a of the electrode fitting 12.
  • a refractory insulating powder which is swaged to provide a densified insulator 14 is filled into the metallic outer sleeve 8 around a junction between the electrode connection lead wire 10 and the electrode fitting 12, whereby the electrode connection lead wire 10 and the electrode fitting 12 are secured in the metallic outer sleeve 8 through the interposed insulator 14.
  • a seal member 16 is fitted between an opening of the metallic outer sleeve 8 and the external surface of the electrode fitting 12.
  • the electrode fitting 12 which has its end 12a secured within the metallic outer sleeve 8 has its other end 12c projecting externally of the metallic outer sleeve 8, and a distal end 18a of an external connection terminal 18 is connected to the end 12c as by butt welding.
  • a sub-assembly including the ceramics heater 6, the metallic outer sleeve 8, the electrode fitting 12 and the external connection terminal 18 is inserted into the internal bore 4 through the end of the housing 2 which is located toward the ceramics heater (or the left end as viewed in Fig.1 ) with a threaded portion 18b of the external connection terminal 18 which is used for connection with a battery disposed foremost and is secured when the metallic outer sleeve 8 is disposed as a press fit at a given position or secured at a given position by brazure (brazure using a silver brazing material).
  • brazure brazure using a silver brazing material
  • a seal member 20 (O-ring 20) and a cylindrical insulating bushing 22 are fitted over the end adjacent to the threaded portion 18b of the external connection terminal 18 which projects externally of the housing, and are inserted into the portion 4c of a greater diameter of the internal bore 4 in the housing 2.
  • a washer-like insulating member 24 is fitted over the threaded end, and an aluminum nut is clamped to the threaded end.
  • the portion 4c of a greater diameter of the internal bore 4 in the housing 2 has a tapered surface 4e toward the portion 4b of a reduced diameter, and when the seal member 20 is pressed between the tapered surface 4e and the insulating bushing 22, a hermetic seal of the interior of the housing 2 is maintained. While the seal member 20 and the insulating bushing 2 can be secured in place by caulking the end of the housing 2, clamping the aluminum nut 26 dispenses with the caulking step and is advantageous in respect of the cost required.
  • the external connection terminal may be secured in place by any other construction.
  • an insulating securing member may be provided between the internal surface of the housing 2 and the external surface of the external connection terminal 18 so that a tightening torque may be applied to the external connection terminal 18.
  • the electrode connection lead wire 10 extending from the ceramics heater 6 and the electrode fitting 12 which is connected to the external connection terminal 18 are connected together inside the metallic outer sleeve 8, and both of them are secured in the metallic outer sleeve 8 by the insulator 14 which fills the interior of the metallic outer sleeve 8. Accordingly, there is no need to provide an insulating support for the electrode connection lead wire 10 and the electrode fitting 12, and the construction which supports them with respect to the housing 2 is simplified, reducing the manufacturing cost.
  • the tightening torque which is applied to the external connection terminal is resisted by the electrode fitting 12 and the insulator 14, thus simplifying the construction which secures the external connection terminal 18.
  • a nickel (Ni) wire or a nickel plated soft steel wire having a thickness ⁇ on the order of 0.5 to 1.0 mm.
  • the electrode fitting 12 has a thickness ⁇ on the order of 2.2 to 2.4 mm where the external diameter of the threaded portion 2a (see Fig. 1 ) of the housing 2 is M8 and has a thickness ⁇ on the order of 2.8mm for M10.
  • the connecting construction between the electrode connection lead wire 10 and the lead wire 12 is formed by forming an insertion opening 12b in the end 12a of the electrode fitting 12, and inserting the distal end 10a of the electrode connection lead wire 10 into the insertion opening 10b and connected thereto by brazure or by caulking.
  • the connection is not limited to this construction.
  • one side of the distal end 12a of the electrode fitting 12 may be notched to form a notched area 12d, and the lateral surface of the distal end 10a of the electrode connection lead wire 10 may be disposed in abutment against the notched area 12d for purpose of connection.
  • a lateral surface of the distal end 10a of the electrode connection lead wire 10 may be disposed in contact with a lateral surface of the distal end 12a of the electrode fitting 12, and the both members may be welded together.
  • the distal end 12a of the electrode fitting 12 may be inserted into one end of a pipe-shaped connection member 30 while the distal end 10a of the electrode connection lead wire 10 may be inserted into the other end of the connection member 30, which is then caulked to connect the both members together.
  • the both members may be disposed into the opposite ends of the connection members 30 as a press fit for purpose of connection.
  • the ceramics heater 6 may be secured in the end of the metallic outer sleeve 8 which is located toward the ceramics heater by brazure or by being disposed as a press fit therein. Obviously, at this time, the heating element 6a of the ceramics heater 6 must be exposed externally of the metallic outer sleeve 8.
  • the metallic outer sleeve 8 in which the ceramics heater 6 is secured is stepped to define the portion 8c of a greater diameter on the side opposite from the end where the ceramics heater 6 is secured and where the electrode fitting 12 is secured, and the junction between the electrode connection lead wire 10 and the electrode fitting 12 is disposed within the portion 8c of a greater diameter (see Fig. 3 (a) ).
  • An exemplary assembling procedure which is used when securing the ceramics heater 6 to the metallic outer sleeve 8 by brazure will be described briefly.
  • An assembly (see Fig. 2 ) of the ceramics heater 6 having the electrode connection lead wire 10 and the electrode fitting 12 connected together is set up on a brazure jig, not shown. It should be noted that a plurality of ceramics heater assemblies are set up on the brazure jig for performing a brazing operation simultaneously.
  • a wire of brazing filler material (brazing silver) which is coiled is set up on the end face of the ceramics heater 6 which is located inside the metallic outer sleeve 8.
  • the metallic outer sleeve 8 is then fitted over the ceramics heater 6.
  • the brazing filler material is then heated to melt to complete a brazing between the ceramics heater 6 and the metallic outer sleeve 8.
  • a refractory insulating powder (such as magnesia (MgO) or the like, for example) 14 is filled into a space in which the junction between the electrode connection lead wire 10 and the electrode fitting 12 is contained through an opening 8d of the metallic outer sleeve 8 which is located at the end of the portion 8c of a greater diameter (see Fig. 3(b) ).
  • a seal member of rubber such as silicone rubber or fluorine containing rubber
  • the insertion of the seal member 16 into the opening 8d of the metallic outer sleeve 8 is effective to prevent a spillage of the refractory insulating powder 14 from occurring when the swaging operation takes place subsequently and also prevents the electrode fitting 12 from contacting the metallic outer sleeve 8.
  • the end of the metallic outer sleeve 8 is then caulked (indicated by reference numeral 8e shown in Fig. 3 (d) ), preventing the seal member 16 from being disengaged.
  • the seal member 16 When the refractory insulating powder 14 is filled into the metallic outer sleeve 8, the seal member 16 is inserted and the end 8e of the metallic outer sleeve 8 is caulked as indicated in Fig. 3 (d) , the portion 8c of a greater diameter of the metallic outer sleeve 8 in which the junction between the electrode connection lead wire 10 and the electrode fitting 12 is contained is subject to a swaging operation, whereby the diameter of the sleeve 8 is reduced to be comparable to the diameter of the portion of the metallic outer sleeve 8 in which the ceramics heater 6 is secured.
  • the refractory insulating powder 14 is densified to secure the electrode fitting 12 within the metallic outer sleeve 8 (see Fig. 3 (e) ).
  • the external diameter of the swaged portion may be slightly greater than or less than the external diameter of the portion of the sleeve 8 in which the ceramics heater 6 is secured.
  • One end 18a of the external connection terminal 18 is secured to the outer end 12c of the electrode fitting 12 which is secured within the metallic outer sleeve 8 by the swaging operation mentioned above (see Fig. 4 ).
  • the sub-assembly shown in Fig. 4 including the ceramics heater 6, the metallic outer sleeve 8, the electrode fitting 12 and the external connection terminal 18 is inserted into the housing 2 and secured in the manner mentioned above, thus assembling a ceramics heater glow plug.
  • the ceramics heater glow plug constructed in the manner mentioned above, a portion of the metallic outer sleeve 8 which is disposed as a press fit into the housing 2 is formed by the swaging operation, and accordingly, a dimensional accuracy can be maintained to stabilize the press fit. Since the electrode connection lead wire 10 of the ceramics heater 6 is embedded in the refractory insulating powder 14, there is no likelihood of a wire breakage due to vibrations, and has a resistance to the ingress of water. In addition, the presence of the refractory insulating powder 14 is effective in suppressing a penetration of the ceramics heater 6 into the metallic outer sleeve 8 as a result of vibration, thermal cycle, internal cylinder pressure or the like.
  • the ceramics heater glow plug can be formed to a construction which is substantially same as a sheath glow plug, parts or an assembling equipment can be used in common to reduce the manufacturing cost.
  • the seal member 16 is inserted into the opening 8b of the metallic outer sleeve 8 before the swaging operation takes place, but the use of the seal member 16 may be omitted.
  • the end adjacent to the opening can be molded to be inwardly tapered or the end adjacent to the opening may be caulked before the swaging operation takes place so as to be inwardly tapered.
  • the opening 8b of the metallic outer sleeve 8 is narrowed in this manner, a spillage of the refractory insulating powder 14 during the swaging operation can be effectively prevented.
  • the metallic outer sleeve 8 is configured before the swaging operation to be stepped to provide the portion 8c of the greater diameter in the region where the electrode fitting 12 is contained, and the swaging operation reduces the diameter of this portion to be comparable to the diameter of the metallic outer sleeve in a portion where the ceramics heater is secured.
  • a metallic outer sleeve which has a uniform diameter over the entire length before the swaging operation takes place.
  • a refractory insulating powder 14 is filled into the portion of the metallic outer sleeve 108 disposed around the electrode fitting 12 through an opening 108d (see Fig. 6 (b) ), and a seal member 16 is inserted into the opening 108d (see Fig. 6 (c) ).
  • the opening 108d of the metallic outer sleeve 108 is caulked from the outside (as indicated by character 108e shown in Fig. 6 (d) ), thus preventing the seal member 16 from being disengaged.
  • a portion 108f of the metallic outer sleeve 108 which is filled with the refractory insulating powder 14 is subject to a swaging operation to reduce a diameter thereof, thus densifying the refractory insulating powder 14 to secure the electrode fitting 12 within the metallic outer sleeve 108.
  • the portion 108f of the metallic outer sleeve 108 in which the electrode fitting 12 is contained will be reduced in diameter as compared with the portion thereof in which the ceramics heater 6 is secured, but the diameter of the portion 108f should be greater than the external diameter of the external connection terminal 18. Since the swaged portion 108f of the metallic outer sleeve represents a portion which is disposed as a press fit into an internal bore 4 of a housing 2, if the portion 108f has an external diameter which is less than the external connection terminal 18, it becomes impossible to pass the external connection terminal 18 through the internal bore 4 of the housing. For this reason, the swaged external diameter of the metallic outer sleeve 108 must be greater than the external diameter of the external connection terminal 18.
  • one end 18a of the external connection terminal 18 is connected to the outer end 12c of the electrode fitting 12 as by butt welding (see Fig. 7 ).
  • the sub-assembly shown in Fig. 7 is assembled with the'housing 2 by similar steps as used in the first embodiment, thus completing a ceramics heater glow plug.
  • the use of the metallic outer sleeve 108 (see Fig. 6 ) having a straight configuration or a uniform diameter over the entire length is advantageous over the use of the stepped metallic outer sleeve 8 having the portion 8c of a greater diameter as in the first embodiment in respect to the manufacturing cost, the use of the stepped metallic outer sleeve 8 becomes necessary depending on the diameter (M8 or M10) of the mounting threads 2a of the housing 2, the external diameter of the ceramics heater 6 which influences upon a temperature rise characteristic of the glow plug or the external diameter of the external connection terminal 18. Accordingly, the configuration of the metallic outer sleeve 8 or 108 may be suitably chosen as required.
  • the metallic outer sleeve 108 having a straight configuration is used, a reduced clearance between the internal surface of the sleeve 108 and the external surface of the electrode fitting 12 results in a reduced amount of the refractory insulating powder 32 which fills the clearance, leading to a difficulty in performing the swaging operation. In such instance, it is necessary to use the stepped metallic outer sleeve 8. Also where the metallic outer sleeve 108 having a straight configuration is used, there arises a likelihood of a short circuit occurring between the electrode fitting 12 and the metallic outer sleeve 108, but such likelihood of a short circuit can be prevented by inserting an insulating hose or the like.
  • the ceramics heater 6 after connecting the ceramics heater 6 and the electrode connection lead wire 10 and the electrode fitting 12, the ceramics heater 6 is cemented to the metallic outer sleeve 8 as by brazure and subsequently the refractory insulating powder 14 is filled into the metallic outer sleeve 8 in preparation to the swaging operation.
  • steps may also be used to manufacture a ceramics heater glow plug.
  • Figs. 8 to 10 show a procedure of assembling a ceramics heater glow plug according to a third embodiment.
  • a brazure initially takes place between the ceramics heater 6 and the metallic outer sleeve 8 and between the lead wire connected to the positive pole of the ceramics heater 6 (not shown, but contained inside the ceramics heater 6) and the electrode connection lead wire 10 concurrently to provide an integral assembly, whereupon the electrode fitting 12 is connected to the distal end of the lead wire 10, followed by the swaging operation to secure and electrically connect the electrode fitting.
  • a brazure jig (not shown) such that a portion 8c of a greater diameter which is to be secured to the housing 2 is disposed at the top, as viewed in Fig. 8 , while a bottom portion of the sleeve 8 is fitted around the ceramics heater 6.
  • the distal end 10b of the electrode connection lead wire 10 is inserted into an insertion opening formed in the end face 6b of the ceramics heater 6 and in which the positive pole lead wire is exposed, and a wire of brazing silver which is coiled is placed on top of the end face 6b of the ceramics heater 6 which is situated inside the metallic outer sleeve 8 and heated to a given temperature such as 900°C, for example, to melt the brazing silver.
  • the molten brazing silver flows into a clearance between the internal surface of the metallic outer sleeve 8 and the external surface of the ceramics heater 6 and a clearance between the internal surface of the insertion opening formed in the ceramics heater 6 and the external surface of the electrode connection lead wire 10, thus completing a brazure.
  • the electrode fitting 12 is provided with a narrowed end 12e in which an insertion opening 12f is formed, and the distal end 10a of the electrode connection lead wire 10 is then inserted into the insertion opening 12f as shown in Fig. 8 (b) .
  • steps used in the first embodiment are performed. Specifically, a refractory insulating powder 14 is filled into a top space in the metallic outer sleeve 8 around the portion 8c of a greater diameter (see Fig. 9 (a) ), a seal member 16 is inserted into the opening 8d of the metallic outer sleeve 8 (see Fig.
  • the portion 8c of a greater diameter of the metallic outer sleeve 8 is subject to a swaging operation to reduce its diameter to a value substantially comparable to the diameter of a portion of the sleeve in which the ceramics heater 6 is secured (see Fig. 9 (d) ).
  • the swaging operation deforms the narrowed end 12e at the distal end of the electrode fitting 12 to secure it and electrically connect it with the lead wire 10 in a reliable manner.
  • One end 18a of the external connection terminal 18 is secured, as by butt welding, to the outer end 12c of the electrode fitting 12 which is now secured within the metallic outer sleeve 8 as a result of the swaging operation (see Fig. 10 ).
  • the sub-assembly which is thus assembled (including the ceramics heater 6, the metallic outer sleeve 8, the electrode connection lead wire 10, the electrode fitting 12 and the external connection terminal 18) is now inserted into and secured in the housing 2 in the manner mentioned previously, thus assembling a ceramics heater glow plug. It will be seen that the ceramics heater glow plug of this embodiment can achieve a similar effect as the glow plugs of the previous embodiments.
  • the assembling procedure of this embodiment provides merits over the embodiments first mentioned.
  • the electrode fitting 12 is initially connected to the electrode connection lead wire 10 of the ceramics heater 6 before the ceramics heater 6 is brazed to the metallic outer sleeve 8, resulting in an increased overall length of the ceramics heater assembly, and it is difficult to achieve a brazure for a plurality of ceramics heater assemblies.
  • the electrode connection lead wire 10 may become flexed under the influence of the weight of the electrode fitting 12, which must be corrected.
  • the presence of the electrode fitting 12 may stand in the way to placing a coil of brazing filler material and if the clearance between the external surface of the electrode fitting 12 and the internal diameter of the metallic outer sleeve 8 is reduced, a difficulty may be experienced in placing the coil of the brazing filler material. Since the brazure between the ceramics heater 6 and the electrode connection lead wire 10 is separate from the brazure between the ceramics heater 6 and the metallic outer sleeve 8, two independent brazures are required.
  • the brazure between the ceramics heater 6 and the metallic outer sleeve 8 and the brazure between the ceramics heater 6 and the electrode connection lead wire 10 take place in one step, followed by the connection of the electrode fitting 12 (such connection may be only temporary) and the swaging operation, thus eliminating all of inconveniences and difficulties experienced during the assembling procedure of the first embodiment.
  • Figs. 11 to 13 show a procedure of assembling a ceramics heater glow plug according to a fourth embodiment.
  • the electrode fitting 12 has a distal end 12a of a reduced diameter (see Fig. 11 (b) which will be described later), and the electrode connection lead wire 10 has one end 10c which is coiled so as to have an internal diameter substantially equal to the external diameter of the distal end 12a of the electrode fitting 12.
  • the ceramics heater 6 and the metallic outer sleeve 8 are set up on a brazure jig, not shown, and an end 10b of the lead wire 10 which is located at the opposite end from the coil 10c is inserted into a mounting hole formed in the ceramics heater 6, and a brazing operation takes place concurrently between the ceramics heater 6 and the metallic outer sleeve 8 and between the ceramics heater 6 and the lead wire 10 (see Fig. 11 (a) ).
  • the distal end 12a of a reduced diameter of the electrode fitting 12 is then inserted into the coiled end 10c of the lead wire 10 (see Fig. 11 (b) ).
  • similar steps as used in the previous embodiments follow, including filling the refractory insulating powder 14 into a top space within the metallic outer sleeve 8 around the portion 8c of a greater diameter (see Fig. 12 (a) ), inserting a seal member 16 into the opening 8b of the metallic outer sleeve 8 (see Fig. 12 (b) ), caulking the end 8e of the metallic outer sleeve 8 (see Fig. 12 (c) ) and swaging the portion 8c of a greater diameter of the metallic outer sleeve (see Fig. 12(d) ).
  • the portion 8c of a greater diameter of the metallic outer sleeve 8 has a slightly greater diameter than the portion thereof in which the ceramics heater 6 is secured even after the swaging operation, as will be noted from Fig. 12 (d) .
  • the portion 8c may be reduced in diameter to a comparable diameter as a portion of the metallic outer sleeve in which the ceramics heater 6 is contained.
  • the distal end 12a of a reduced diameter of the electrode fitting 12 may be formed with an unevenness. The unevenness on the electrode fitting 12 allows it to be more firmly bonded with the coiled end 10c of the-lead wire 10, eliminating any likelihood of disengagement therebetween from occurring.
  • one end 18a of the external connection terminal 18 is secured to the outer end 12c of the electrode fitting 12 (see Fig. 13 ), and the sub-assembly is assembled into the housing 2 to complete a ceramics heater glow plug.
  • Figs. 14 to 16 show a procedure of assembling a ceramics heater glow plug according to a fifth embodiment.
  • the electrode connection lead wire 10 of a short length is connected to a positive pole lead wire situated within the ceramics heater 6 and is taken out of the ceramics heater 6, and the electrode fitting 12 is connected to the end 10a, 10c of the lead wire 10 within the metallic outer sleeve 8.
  • one end 10b of the electrode connection lead wire 10 having an increased length which is long enough to extend to the outside of the metallic outer sleeve 8 is inserted into a mounting pole through which a lateral surface of a positive pole lead wire of the ceramics heater 6 is exposed and is connected thereto (see Fig. 14 (a) ).
  • the steps of brazing between the ceramics heater 6 and the metallic outer sleeve 8 and between the ceramics heater 6 and the electrode connection lead wire 10 are similar to corresponding steps in the third and the fourth embodiment.
  • the electrode fitting 12 is formed with an axially extending through-opening 12g, into which the electrode connection lead wire 10 is passed and is secured to and electrically connected to the electrode fitting 12 as by caulking (see Fig. 14(b) ).
  • the electrode connection lead wire 10 which is taken out of the ceramics heater 6 is connected to the electrode fitting 12, and as in the described embodiments, the refractory insulating powder 14 is filled into the space in the metallic outer sleeve 8 around the portion 8c of a greater diameter (see Fig. 15 (a) ), the seal member 16 is inserted into the opening 8d (see Fig. 15 (b) ), the end 8e of the metallic outer sleeve 8 is caulked (see Fig. 15(c) ), and the portion 8c of a greater diameter is swaged (see Fig. 15(d) ) in a sequential manner.
  • the step of caulking the electrode fitting 12 in order to secure it with the electrode connection lead wire 10 may take place immediately after the lead wire 10 is inserted into the through-opening 12g formed in the electrode fitting 12, or may be performed upon completion of the swaging operation. Subsequently, any fragment of the lead wire 10 which project through the electrode fitting 12 is cut off (see Fig. 15(e) ).
  • the end 18a of the external connection terminal 18 is connected to the end 12g of the electrode fitting 12 (see Fig. 16 ), and the sub-assembly shown in Fig. 16 is inserted into and secured to the housing 2 to complete a ceramics heater glow plug.
  • the assembling procedure of the fifth embodiment is similar to the third embodiment (shown in Figs. 8 to 10 ) in that the electrode connection lead wire 10 is inserted into and secured to the through-opening 12g formed in the electrode fitting 12, but in the third embodiment, the operation of inserting the lead wire 10 into the electrode fitting 12 takes place within the metallic outer sleeve 8, and accordingly, a difficulty may be experienced in inserting the lead wire 10 and in confirming whether or not the lead wire has been inserted, leading to a failure of connection.
  • the length of the electrode connection lead wire 10 is increased and the lead wire is inserted into the through-opening 12g in the electrode fitting 12 outside the metallic outer sleeve 8, thus facilitating the insertion and the confirmation that it has been inserted, thus eliminating the likelihood of a failure of connection to improve a quality control.
  • Figs. 17 to 19 shows a procedure of assembling a ceramics heater glow plug according to a sixth embodiment.
  • an electrode connection lead wire 110 which is to be connected to a positive pole lead wire located within the ceramics heater 6 is thick enough to exhibit a certain degree of rigidity.
  • the electrode connection lead wire 110 and the ceramics heater 6 as well as the ceramics heater 6 and the metallic outer sleeve 8 are secured and connected together by a brazure (see Fig. 17 (a) ).
  • a distal end 110a of the electrode connection wire 110 is inserted into one end of a pipe-shaped connection member 30 which is secured to the distal end 12a of the electrode fitting 12 by being caulked (which is indicated by reference character 30a) (see Fig. 17 (b) ).
  • the electrode connection wire 110 requires a degree of rigidity which can be inserted and fitted into the connection member 30.
  • connection member 30 which is secured to the electrode fitting 12 is fitted over the distal end 110a of the electrode connection wire 110
  • the refractory insulating powder 14 is filled into the space within the metallic outer sleeve 8 around the portion 8c of a greater diameter (see Fig. 18 (a) )
  • the seal member 16 is fitted into the opening 8d (see Fig. 18(b) )
  • the end 8e of the metallic outer sleeve 8 is caulked (see Fig. 18 (c) )
  • portion 8c of a greater diameter of the metallic outer sleeve 8 is swaged (see Fig. 18 (d) ).
  • the end 18a of the external connection terminal 18 is connected to the outer end 12c of the electrode fitting 12 by a butt welding (see Fig. 19 ), and the resulting sub-assembly is secured in the housing 2 to complete a ceramics heater glow plug.
  • Figs. 20 to 22 shows a procedure of assembling a ceramics heater glow plug according to a seventh embodiment.
  • an electrode connection wire 110 which is to be connected to a positive pole lead wire located within the ceramics heater 6 has sufficient rigidity which allows it to urge the electrode fitting 12, as will be described below.
  • the metallic outer sleeve 8 and the ceramics heater 6 as well as the ceramics heater 6 and the electrode connection wire 110 are connected together concurrently by a brazure (see Fig. 20 (a) ).
  • a heat shrinkable tube 32 is mounted on the distal end 12a of the electrode fitting 12 (see Fig. 20 (b) ). It is to be noted that at this point, the tube 32 has not yet been shrunk.
  • the end 12a of the electrode fitting 12 is urged against the end 110a of the electrode connection wire 110 to have the heat shrunk tube 32 fitted around the electrode connection wire 110.
  • the heat shrinkable tube 32 is then caused to shrink under heat to be secured thereon (see Fig. 20(c) ).
  • the refractory insulating powder 14 is filled into the space in the metallic outer sleeve 8 around the portion 8c of a greater diameter (see Fig. 21 (a) ), the seal 16 is inserted into the opening 8d (see Fig. 21 (b) ), the end 8e is caulked (see Fig. 21 (c) ), and the portion 8c of the greater diameter is swaged (see Fig. 21 (d) ). Subsequently, the end 18a of the external connection terminal 18 is secured to the end 12c of the electrode fitting 12 as by a butt welding ( Fig. 22 ), and the resulting sub-assembly is inserted into and secured in the housing 2 to complete a ceramics heater glow plug.
  • the electrode connection wire 110 and the electrode fitting 12 are connected together using either the connection member 30 or the heat shrinkable tube 32, thus achieving a reliable connection between the wire 110 and the electrode fitting 12.
  • the ceramics heater 6 and the metallic outer sleeve 8 as well as the positive pole lead wire located within the ceramics heater 6 and the electrode connection lead wire 10 (or the electrode connection wire 110) are secured together in one brazing operation, and then the electrode fitting 12 is connected to the electrode connection lead wire 10 (or the electrode connection wire 110) (this connection may be a temporary connection), followed by the swaging operation to secure the electrode fitting to achieve an electrical connection in a reliable manner, and accordingly, there is no need for a welding or caulking step to take place between the electrode connection lead wire 10 or 110 and the electrode fitting 12, allowing a reduction in the number of steps required.
  • a number of ceramics heaters 6 and metallic outer sleeves 8, which are greater in number than in the first and second embodiment, can be concurrently brazed together while avoiding any influence of the weight of the electrode fitting 12 upon the electrode connection lead wire 10 during the brazing operation to avoid a deformation of the lead wires.
  • placement of a brazing filler material is facilitated and the result of the brazing operation can be more easily observed, adding an advantage to the quality control.
  • the ease of assembly is not detracted if an electrode fitting 12 of a greater diameter than the ceramics heater 6 is used, allowing a free choice of sizes.
  • a heat treatment of the electrode fitting 12 is permitted, enabling a torque accommodation in a glow plug of a thin diameter (for example M8) while allowing an expensive working such as glass fusing to be avoided.
  • the brazure can be completed in one step with an improved assembly and productivity, leading to an economical advantage.
  • Fig. 23 is a longitudinal section showing a status of a ceramics heater glow plug according to an eighth embodiment in the course of assembly thereof.
  • an electrode connection lead wire 210 which is connected to a positive pole lead wire is coiled at its end 210c which is to be connected with an electrode fitting, in the similar manner as in the fourth embodiment shown in Figs. 11 to 13 .
  • a hollow pipe member is used for the electrode connection lead wire 210.
  • the ceramics heater 6 and the metallic outer sleeve 8 are set on a brazure jig, and an end 210b of the electrode connection lead wire 210 which is opposite from the coiled end 210c is inserted into a mounting hole 6c formed in the end of the ceramics heater 6, and a brazing operation takes place concurrently between the ceramics heater 6 and the metallic outer sleeve 8 and between the ceramics heater 6 and the electrode connection lead wire 210.
  • any air which remains in the mounting hole 6 is exhausted externally through a hollow passage 210d (see Figs. 24 (a) and (b) ) during the brazing operation, thus allowing bubbles which may be generated during the brazing operation to be reduced, with consequence that an increase in the resistance of brazed parts is suppressed, permitting a variation in the performance of the glow plug to be prevented.
  • the hermetic seal of brazed parts is also improved, allowing the ingress of moisture or oil content into the heating element of the ceramics heater to be prevented and also allowing cracks which may result from the evaporation of such contents within the ceramics heater to be prevented.
  • a variety of advantages result including a reduction in the number of voids and pores within the brazed parts and an increase in the strength of connection of the electrode fitting.
  • a portion of a reduced diameter which is located at the distal end of the electrode fitting is inserted into the coiled end 210c of the electrode connection lead wire 210, in the similar manner as shown in Figs. 11 to 13 .
  • the refractory insulating powder is filled into the top space within the metallic outer sleeve 8 around the portion 8c of a greater diameter, the seal member is inserted into the opening of the sleeve 8, the end of the sleeve 8 is caulked and then the sleeve is swaged.
  • One end of the external connection terminal is secured to the outer end of the electrode fitting as by a butt welding, and the resulting sub-assembly is assembled into the housing to complete a ceramics heater glow plug.
  • the hollow pipe 210 having a circular through-passage 210d formed therein is used as the electrode connection lead wire 210 (see Fig. 24 (a) and (b) ), but the present invention is not limited to the use of such a hollow pipe 210.
  • a hollow pipe 310 having a slit 310e formed therein which communicates the internal through-passage 310d with the exterior, as indicated in Figs. 24 (c) and (d) may also be used.
  • any member having a passage 210d or 310d which allows the air within the mounting hole 6c to be led externally of the ceramics heater 6 may be used when it is inserted into the mounting hole 6c of the ceramics heater 6 and the brazing operation takes place.
  • Fig. 25 shows an essential part of a ceramics heater glow plug according to a ninth embodiment.
  • a hollow pipe member 410 is used as an electrode connection lead wire, in the same manner as in the eighth embodiment.
  • the electrode connection lead wire 410 includes a straight pipe section 410f of a reduced diameter having an end which is formed with a cup-shaped connector 410 while the opposite end 410b is inserted into a mounting hole 6c formed in the ceramics heater 6 to be secured therein by a brazure.
  • the distal end of the electrode fitting is inserted into the cup-shaped connector 410g for purpose of electrical connection.
  • the distal end of the electrode fitting is sized to be a close fit with the internal diameter of the connector 410g of the lead wire 410, and after the electrode fitting and the end 410g of the lead wire 410 are fitted together, sequential steps of filling a refractory insulating powder into a top space within the metallic outer sleeve 8 around the portion 8c of a greater diameter, inserting a seal member into the , opening of the metallic outer sleeve 8, caulking the end of the metallic outer sleeve 8 and swaging the portion 8c take place in the similar manner as in the previous embodiments.
  • This embodiment uses the hollow pipe member 410 for the electrode connection lead wire, and thus achieves a similar effect as achieved in the eighth embodiment.
  • Fig. 26 shows part of an assembling step for a glow plug according to a tenth embodiment, in particular, illustrating a unique connection between an electrode connection lead wire 510 and an electrode fitting 112.
  • a hollow pipe-shaped member is used for the electrode connection lead wire 510 in the similar manner as in the eighth and the ninth embodiment.
  • the end 210c of the lead wire 210 which is located toward the electrode fitting is coiled in the manner of a spring having spaced successive turns
  • the end 510h of the lead wire 510 which is located toward the electrode fitting is in the form of a helical coil having successive turns which are in close contact with each other.
  • the electrode fitting 112 has a distal end 112e which is to be connected with the helical coil 510h of the electrode connection lead wire 510.
  • the distal end 112e is in the form of a stack of umbrella or fungi having a maximum diameter (indicated by reference character 112ea) which is slightly greater than the internal diameter of the helical coil 510h of the lead wire 510.
  • a straight end 510b of the electrode connection lead wire 510 which comprises a hollow pipe member is inserted into a mounting hole 6c formed in the ceramics heater 6, and a brazure takes place between the ceramics heater 6 and the metallic outer sleeve 8 and between the ceramics heater 6 and the electrode connection lead wire 510. It will be seen that when the brazing operation takes place, the use of the hollow pipe member for the electrode connection lead wire 510 allows an air which remains in the mounting hole 6c to be exhausted in a similar manner as described above in connection with the eighth and the ninth embodiment.
  • the distal end 112e of the electrode fitting 112 is placed against the helical coil 510h of the lead wire 510, and is urged axially (or in the vertical direction as viewed in Fig. 26 ), as indicated by an arrow A shown in Fig. 26 (a) to connect the lead wire 510 and the electrode fitting 112 together (see Fig. 26 (b) ).
  • the helical coil 510h of the lead wire 510 is internally formed with an unevenness which is engaged with a plurality of bases of the umbrella or the fungi having the maximum diameter 112ea formed on the distal end 112e of the electrode fitting 112 to prevent their disengagement, thus connecting the lead wire 510 and the electrode fitting 112 mechanically and electrically in a reliable manner.
  • the distal end 112e of the electrode fitting 112 is formed with a stack of umbrella or fungi-shaped heads, it should be understood that the invention is not limited to such configuration, but the distal end 112e may be formed with a stack of steps of any other configuration which are engageable with the internal surface of the helical coil 510h of the lead wire 510.
  • the swaging operation takes place in the similar manner as mentioned above, and the resulting sub-assembly is assembled into the housing to complete a ceramics heater glow plug. While the connection of the electrode connection lead wire 510 with the electrode fitting 512 which is formed by a hollow pipe member has been described, the arrangement of Fig. 26 can be used to connect the electrode connection lead wire and the electrode fitting together if an electrode connection lead wire other than a hollow pipe member is used.
  • Fig. 27 shows part of an assembling step for a ceramics heater glow plug according to an eleventh embodiment.
  • an electrode connection lead wire 510 having a helical coil 510h formed on an end of the pipe-shaped member is used as in the tenth embodiment.
  • the electrode fitting 212, to which the lead wire 510 is to be electrically connected has a distal end 212f which is in the form of threads having an external diameter which is slightly greater than the internal diameter of a convex portions formed as an unevenness on the internal surface of the helical coil 510h of the lead wire 510.
  • the electrode fitting 212 is turned around its axis, as indicated by an arrow B in Fig. 27 (a) , to cause the threads 212f formed on the distal end of the electrode fitting 212 to be threadably engaged with the helical coil 510h of the lead wire 510, thus connecting the lead wire 510 and the electrode fitting 512 together.
  • This construction also achieves a reliable mechanical and electrical connection between the lead wire 510 and the electrode fitting 512.
  • Fig. 28 shows a procedure of assembling a ceramics heater glow plug according to a twelfth embodiment, in particular, the manner of securing the ceramics heater 6 and the electrode fitting 12 through a metallic outer sleeve 208.
  • the ceramics heater 6 and the electrode connection lead wire 10 are constructed in the similar manner as shown in the fourth embodiment ( Figs. 11 to 13 ), but the configuration of the metallic outer sleeve 208 in which the ceramics heater 6 is secured and the relative positions of the ceramics heater 6 and the metallic outer sleeve 208 are different from the fourth embodiment.
  • the metallic outer sleeve 208 comprises a stepped pipe including a straight portion 208a having a minimum diameter, a portion 208b of a greater or a medium diameter and a portion 208c having a maximum diameter.
  • the ceramics heater 6 is secured within the straight portion 208a having the minimum diameter.
  • the end face 6b of the ceramics heater 6 through which the electrode connection lead wire 10 is taken out is situated within the straight portion having the minimum diameter of the metallic outer sleeve 8, but in the twelfth embodiment, the end face 6b of the ceramics heater 6 is situated within the portion 208b having a medium diameter rather than within the straight portion 208a having the minimum diameter.
  • one end 10c of the electrode connection lead wire 10 which is located toward the electrode fitting 12 is formed into a coil having an internal diameter which is comparable to the external diameter of the distal end 12a having a reduced diameter of the electrode fitting 12.
  • the ceramics heater 6 and the metallic outer sleeve 8 are set up on a brazure j ig, not shown, and the other end 10b of the lead wire 10 is inserted into a mounting hole 6c formed in the ceramics heater 6 to be brazed therewith (see Fig. 28 (a) ).
  • the ceramics heater 6 may be cemented with the electrode connection lead wire 10 and the metallic outer sleeve 208, respectively, by two separate brazing steps.
  • the portion 12a of a reduced diameter which is formed at the distal end of the electrode fitting 12 is inserted into the coiled end 10c of the lead wire 10 (see Fig. 28(b) ). It is to be noted that in this embodiment, the portion 12a of a reduced diameter of the electrode fitting 12 is formed with a portion 12h of an increased diameter at its tip, which is engaged with the coiled end 10c to prevent the disengagement thereof from the coil.
  • a refractory insulating powder 14 is filled into the portion 208b of a medium diameter and the portion 208c of a maximum diameter of the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 28 (c) ), and the portion 208c of the metallic outer sleeve is subject to a swaging operation (see Fig. 28 (d) ).
  • the swaging operation reduces the diameter of the portion 208c of the metallic outer sleeve 208 to a value which is comparable to the diameter of the portion 208b.
  • the junction between the coiled end 10c of the lead wire 10 and the electrode fitting 12 is situated within the portion 208c of a maximum diameter of the metallic outer sleeve 208, and accordingly, when the portion 208c is swaged, the lead wire 10 and the electrode fitting 12 are cemented together in a reliable manner to provide an electrical connection therebetween.
  • One end 18a of the external connection terminal 18 is secured to the outer end 12c of the electrode fitting 12 as by a butt welding, and the resulting sub-assembly is assembled into the housing 2 to complete a ceramics heater glow plug.
  • the swaging operation achieves a firm connection between the ceramics heater 6 and the electrode fitting 12 through the metallic outer sleeve 208 interposed.
  • the end face 6b of the ceramics heater 6 through which the positive pole lead wire is taken out is not located within the straight portion 208a having a minimum diameter to which the negative pole lead wire is connected, but is situated within the portion 208b having a medium diameter, thus improving the insulation between the positive and the negative pole and facilitating the placement of a brazing silver in preparation to the brazing operation.
  • Fig. 29 shows an assembling procedure for a ceramics heater glow plug according to a thirteenth embodiment.
  • an end of the electrode connection lead wire 10 which is located toward the ceramics heater 6 is formed with a cap-shaped connector 10j which is fitted over a positive pole lead connection end 6d of the ceramics heater 6.
  • a positive pole lead wire extending from a heating element is exposed on the external surface of the end 6d of the ceramics heater 6 so that when the connector 10j of the lead wire 10 is fitted over the end 6d of the ceramics heater 6, an electrical connection is achieved at the same time as the ceramics heater 6 and the electrode connection lead wire 10 are mechanically secured together.
  • the portion 12a of a reduced diameter which is formed on the distal end of the electrode fitting 12 is inserted into the coiled end 10c of the lead wire 10 to be connected therewith (see Fig. 29(b) ), a refractory insulating powder is filled into the portion 208a of a medium diameter and the portion 208c of a maximum diameter of the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 29 (c) ), and the portion 208c is swaged (see Fig. 29 (d) ).
  • the swaging operation achieves a reliable cementation between the ceramics heater 6 and the connector 10j of the lead wire 10 and between the coiled end 10c of the lead wire 10 and the electrode fitting 12. Subsequently, one end 18a of the external connection terminal 18 is secured to the outer end 12c of the electrode fitting 12 as by a butt welding, and a resulting sub-assembly is assembled into the housing 2 to complete a ceramics heater glow plug.
  • Fig. 30 shows an assembling procedure according to a fourteenth embodiment.
  • an end of the electrode connection lead wire 10 which is to be connected to the ceramics heater 6 is formed with a coil 10k of a reduced diameter.
  • the opposite end of the ceramics heater 6 which is connected to the positive pole is formed with a portion 6e of a reduced diameter, and a positive pole lead wire extending from a heating element is disposed as exposed around the portion 6e of a reduced diameter.
  • the electrode fitting 12 is fitted into the coiled end 10c of the lead wire to be connected therewith.
  • a refractory insulating powder is filled into the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 30(c) ), and the swaging operation takes place (see Fig. 30(d) ).
  • Fig. 31 shows an assembling procedure according to a fifteenth embodiment, and the ceramics heater 6 and the electrode connection lead wire 10 are connected together with a similar construction as used in the fourteenth embodiment.
  • a construction which takes out a negative pole wire from a heating element 36 of the ceramics heater 6 is different from the embodiments described above.
  • an end of a negative pole lead wire is exposed to a portion of either metallic outer sleeve 8, 108 or 208 where a ceramics heater 6 is cemented (namely, the straight portion 208a having the minimum diameter), whereby it is electrically connected to the internal surface of either metallic outer sleeve 8, 108 or 208.
  • the negative pole lead wire 38 extending from the heating element 36 extends through the ceramics heater 6 to a point which is situated within the portion 208b of having a medium diameter of the metallic outer sleeve 108, and has an end 38a which is electrically connected to the metallic outer sleeve 208 through a conductive ring 40.
  • the ceramics heater 6 is cemented to the metallic outer sleeve 208 and the electrode connection lead wire 10 is fitted over the portion 6e of a reduced diameter formed at the distal end of the ceramics heater 6 to be connected therewith (see Fig. 31 (a) ), the distal end 12a of the electrode fitting 12 is inserted into the coil 10c of the lead wire 10 to be connected therewith (see Fig. 31(b) ), a refractory insulating powder 14 is filled into the metallic outer sleeve 208 and a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 31 (c) ), whereupon the metallic outer sleeve is swaged to secure the ceramics heater 6 and the electrode fitting 12 (see Fig. 31(d) ).
  • the negative pole lead wire 38 is cemented to the metallic outer sleeve 108 inside the metallic outer sleeve 208 (or within the portion 208b having a medium diameter), it will be seen that as compared with the described embodiments where the negative pole lead wire is connected to the straight portion having a minimum diameter of either metallic outer sleeve 8, 108 or 208, the location where the lead wire 38 is cemented is further removed from the heating element 6a and thus assumes a lower temperature and thus is less susceptible to the influence of a difference in the coefficient of linear expansion between the ceramics and the metallic outer sleeve, thus improving the reliability of cementations.
  • Fig. 32 shows an assembling procedure for a ceramics heater glow plug according to a sixteenth embodiment.
  • the configuration of a ceramics heater 106 differs from the described embodiments.
  • the ceramics heater 106 includes a portion 106f of an increased diameter toward an end through which a positive pole lead wire is taken out.
  • the portion 106f is configured to be in substantial conformity to a shift in the internal surface of the metallic outer sleeve 208 from the portion 208b having a medium diameter to the portion 208a having a minimum diameter.
  • the portion 106f having an increased diameter of the ceramics heater 106 is formed with a distal end 106e of a reduced diameter, and the end of a positive pole lead wire 142 extending from a heating element 136 is exposed on the lateral surface of the end 106e. Accordingly, when a coil 10k of a reduced diameter at one end of the electrode connection lead wire 10 is fitted over the end 106e to be secured therewith, the lead wire is electrically connected with the lead wire 142.
  • the negative pole lead wire 138 is taken out of the ceramics heater 106 at a point which is located within the portion 208a having a minimum diameter of the metallic outer sleeve 208, but located toward the portion 106f of an increased diameter, where it is cemented to the internal surface of the metallic outer sleeve 208 to be electrically connected therewith.
  • the ceramics heater 106 which is configured in the manner mentioned above is inserted into the portion 208c having a maximum diameter of the metallic outer sleeve 208 to be secured within the portion 208b of a medium diameter and a straight portion 208a of the minimum diameter of the metallic outer sleeve 208.
  • the coil 10k of the electrode connection lead wire 10 is fitted over the ceramics heater 106 to be connected therewith (see Fig. 32 (a) ), the electrode fitting 12 is connected to the coil 10c located at the other end of the lead wire 10 (see Fig.
  • a refractory insulating powder 14 is filled into the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 32 (c) ), and the swaging operation of the metallic outer sleeve takes place (see Fig. 32 (d) ).
  • the ceramics heater 106 having the portion 106f of an increased diameter formed on the end which is disposed inside the metallic outer sleeve 208, the positioning when brazing the ceramics heater 106 and the metallic outer sleeve 208 is facilitated. In the event an abnormal combustion occurs during the use of the glow plug, the ceramics heater 106 which is thus positioned can not be displaced relative to the metallic outer sleeve 208, thus improving the reliability.
  • Fig. 33 shows an assembling procedure for a ceramics heater glow plug according to a seventeenth embodiment.
  • a ceramics heater 106 of this embodiment differs in configuration from the described embodiments.
  • the ceramics heater 206 has a greater diameter in its portion which projects externally of the metallic outer sleeve 208 or a heater portion 206a in which a heat element 236 is embedded.
  • the heater portion 206a has an external diameter which substantially matches the external diameter of the portion 208a of the metallic outer sleeve 208 which has a minimum diameter.
  • the ceramics heater 206 is inserted into the straight portion 208a having a minimum diameter of the metallic outer sleeve 208, and after the ceramics heater 206 is cemented with the sleeve 208 and the portion 206e of a reduced diameter which is located at the distal end of the ceramics heater 206 is connected with a coil 10k of a reduced diameter of the electrode connection lead wire 10 (see Fig. 33 (a) ), the electrode fitting 22 is connected to the coil 10c of the lead wire 10 (see Fig.
  • a refractory insulating powder 14 is filled into the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the metallic outer sleeve 208 (see Fig. 33 (c) ), and the swaging operation takes place (see Fig. 33 (d) ).
  • the relative positioning between the ceramics heater 206 and the metallic outer sleeve 208 is facilitated when the brazing operation takes place. This also prevents a displacement of the ceramics heater 206 relative to the metallic outer sleeve 208.
  • Fig. 34 shows an assembling procedure for a ceramics heater glow plug according to an eighteenth embodiment.
  • a wire material of a reduced diameter is used for the electrode connection lead wire 10 which connects the positive pole of either heating element 36, 136 or 236 of the ceramics heater 6, 106 or 206 to the electrode fitting 12.
  • the positive pole lead wire (not shown) extending from the heating element of the ceramics heater 6 is cemented with the electrode fitting 12 through a cylindrical hardware 50 to provide an electrical connection therebetween.
  • the cylindrical hardware 50 has a connector 50a of an increased diameter for connection with the ceramics heater 6 and another connector 50b of an increased diameter for connection with the electrode fitting 12.
  • the connector 50a has an internal diameter which substantially matches or is slightly greater than the external diameter of the end 6d of the ceramics heater 6.
  • the connector 50b has an internal diameter which substantially matches or is slightly greater than the external diameter of the distal end 12a of the electrode fitting 12.
  • the ceramics heater 6 is inserted into the metallic outer sleeve 208 and is positioned such that the heating element 6a projects externally of the sleeve while the end 6d is disposed within the portion 208b having a medium diameter of the sleeve, and the sleeve 208 and the ceramics heater 6 are cemented together by a brazing operation.
  • the connector 50a of the cylindrical hardware 50 is fitted over the end 6d of the ceramics heater 6 which remains within the metallic outer sleeve 208 (see Fig. 34 (a) ).
  • the distal end 12a of the electrode fitting 12 is inserted into the other connector 50b of the cylindrical hard ware 50 (see Fig. 34 (b) ).
  • a refractory insulating powder 14 is filled into the metallic outer sleeve 208, a seal member 16 is inserted into the opening of the sleeve 208 (see Fig. 34(c) ), and a swaging operation takes place (see Fig. 34 (d) ).
  • the swaging operation reduces the diameter of the portion 208 (c) of the sleeve 208, and also reduces the diameter of the cylindrical hardware disposed within the sleeve 208 through the refractory insulating powder 14, thus firmly cementing the ceramics heater 6 and the electrode fitting 12 together.
  • a ceramics heater glow plug according to the invention is used as a start aid for a diesel engine.
  • the glow plug has a reduced diameter and an increased length, and thus is suitable for use in a diesel engine of direct injection type having an increased number of valves.

Landscapes

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

Claims (21)

  1. Bougie de préchauffage à dispositif de chauffage en céramique comportant
    un dispositif de chauffage en céramique (6) formé par un matériau céramique isolant et un conducteur inorganique, le dispositif de chauffage en céramique ayant un élément de chauffage (6a) et des fils conducteurs, l'un des fils conducteurs (10) s'étendant depuis l'élément de chauffage (6a) et faisant saillie à partir d'une face d'extrémité (6b) du dispositif de chauffage en céramique (6), la face d'extrémité étant disposée à l'intérieur d'un manchon extérieur métallique (8) ;
    le manchon extérieur métallique (8) ayant une extrémité dans laquelle le dispositif de chauffage en céramique (6) est fixé et une autre extrémité qui est adaptée pour être fixée à l'intérieur d'un alésage interne (4) d'un boîtier (2) ; et
    un raccord d'électrode (12) relié au fil conducteur, où le raccord d'électrode (12) se présente sous la forme d'un corps rigide, caractérisée en ce que
    une jonction entre le raccord d'électrode (12) et le fil conducteur (10) est reçue à l'intérieur du manchon extérieur métallique (8), et en ce qu'un isolant densifié (14) est prévu dans le manchon extérieur métallique (8) autour de la jonction entre le raccord d'électrode (12) et le fil conducteur (10), moyennant quoi le raccord d'électrode (12) et le fil conducteur (10) sont fixés au manchon extérieur métallique (8) par l'intermédiaire de l'isolant interposé (14).
  2. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 1, dans laquelle le raccord d'électrode (12) a une face d'extrémité qui est formée avec une ouverture d'insertion (12b), dans laquelle une extrémité du fil conducteur (10) est insérée à des fins de liaison entre celles-ci.
  3. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 2, dans laquelle l'ouverture d'insertion (12b) représente une ouverture traversante s'étendant axialement à travers le raccord d'électrode (12), le fil conducteur (10) étant passé à travers l'ouverture traversante et ensuite la périphérie extérieure du raccord d'électrode (12) étant soumise à une déformation plastique pour établir une liaison entre le fil conducteur (10) et le raccord d'électrode (12).
  4. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 1, dans laquelle une surface latérale de l'extrémité distale (10a) du fil conducteur (10) est disposée en butée contre une surface latérale de l'extrémité distale (12a) du raccord d'électrode (12) à des fins de liaison entre celles-ci.
  5. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 4, dans laquelle l'extrémité distale (12a) du raccord d'électrode (12) est formée avec un étage, contre lequel une surface latérale de l'extrémité distale (12a) du fil conducteur (10) est disposée en butée à des fins de liaison entre celles-ci.
  6. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 1, dans laquelle le raccord d'électrode (12) et le fil conducteur (10) sont reliés ensemble par l'intermédiaire d'un élément de liaison (30).
  7. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 1, dans laquelle un élément de tuyau creux est utilisé pour le fil conducteur (10) qui est relié à l'électrode de l'élément de chauffage (6).
  8. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 1, dans laquelle un élément de tuyau creux fendu est utilisé pour le fil conducteur (10) qui est relié à l'électrode de l'élément de chauffage (6).
  9. Bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1, 7 et 8, dans laquelle l'extrémité distale (10a) du fil conducteur (10) est formée dans une bobine (10c), dans laquelle l'extrémité distale (12a) du raccord d'électrode (12) est insérée à des fins de liaison électrique entre celles-ci.
  10. Bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 7 ou 8, dans laquelle le fil conducteur (10) formé par l'élément de tuyau creux a une extrémité qui est formée avec un connecteur en forme de coupelle (410g) dans lequel l'extrémité distale du raccord d'électrode est ajustée.
  11. Bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1, 7 et 8, dans laquelle le fil conducteur (510) a une extrémité qui est enroulée en hélice tandis que l'extrémité distale (112a) du raccord d'électrode (112) est formée avec une pluralité d'étages (112e), qui sont engagés avec une irrégularité formée par la bobine hélicoïdale pour relier le fil conducteur et le raccord d'électrode ensemble.
  12. Bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1, 7 et 8, dans laquelle le fil conducteur (10) a une extrémité qui est enroulée en hélice tandis que l'extrémité distale (212a) du raccord d'électrode (12) est formée avec des filetages (212f), qui sont engagés par filetage avec la bobine hélicoïdale pour relier le fil conducteur et le raccord d'électrode ensemble.
  13. Bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1 à 12, dans laquelle un élément d'étanchéité élastique (20) est ajusté dans une ouverture du manchon extérieur métallique qui est formé en direction du raccord d'électrode.
  14. Bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1 à 13, dans laquelle le manchon extérieur métallique (8) comprend un tuyau étagé comportant une partie d'un diamètre réduit (208a) et une autre partie d'un plus grand diamètre (208b) et une face d'extrémité du dispositif de chauffage en céramique qui se trouve à l'intérieur du manchon extérieur métallique est disposée à l'intérieur de la partie d'un plus grand diamètre.
  15. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1 à 14, comprenant les étapes séquentielles qui consistent
    à relier un fil conducteur (10) faisant saillie à partir d'une face d'extrémité du dispositif de chauffage en céramique (6) au raccord d'électrode (12) ;
    à fixer le dispositif de chauffage en céramique (6) à l'intérieur d'une extrémité du manchon extérieur métallique (8) ;
    à remplir le manchon extérieur métallique (8) d'une poudre isolante réfractaire à travers l'autre extrémité de celui-ci ;
    et à soumettre la périphérie extérieure du manchon extérieur métallique (8) dans une région dans laquelle le fil conducteur (10) et le raccord d'électrode (12) sont reçus à une opération d'emboutissage pour réduire le diamètre de celle-ci ; ce qui permet de fixer le raccord d'électrode à l'intérieur du manchon extérieur métallique.
  16. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 1 à 14, comprenant les étapes séquentielles qui consistent
    à fixer le dispositif de chauffage en céramique (6) dans une extrémité du manchon extérieur métallique (8) ;
    à relier un fil conducteur (10) qui fait saillie à partir d'une face d'extrémité du dispositif de chauffage en céramique (6) au raccord d'électrode (12) ;
    à remplir le manchon extérieur métallique (8) d'une poudre isolante réfractaire à travers l'autre extrémité de celui-ci ;
    et à soumettre la périphérie extérieure du manchon extérieur métallique (8) dans une région dans laquelle le fil conducteur (10) et le raccord d'électrode (12) sont reçus à une opération d'emboutissage pour réduire le diamètre de celle-ci, ce qui permet de fixer le raccord d'électrode à l'intérieur du manchon extérieur métallique.
  17. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon la revendication 16, dans lequel la fixation du dispositif de chauffage en céramique (6) dans une extrémité du manchon extérieur métallique (8) a lieu simultanément avec la liaison d'une extrémité du fil conducteur (10) au dispositif de chauffage en céramique (6).
  18. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 15 à 17, dans lequel une région du manchon extérieur métallique (8) qui est soumise à l'opération d'emboutissage a un diamètre externe avant l'opération d'emboutissage qui est plus grand qu'un diamètre externe de la partie du manchon extérieur métallique (8) où le dispositif de chauffage en céramique (6) est fixé.
  19. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 15 à 18, dans lequel après l'étape de remplissage du manchon extérieur métallique (8) d'une poudre isolante réfractaire à travers l'autre extrémité de celui-ci, un élément d'étanchéité élastique (20) est ajusté dans une ouverture du manchon extérieur métallique (8) disposé vers le raccord d'électrode (12).
  20. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 15 et 16, dans lequel le fil conducteur (10) relié à l'électrode de l'élément de chauffage (6) a une extrémité qui est enroulée en hélice tandis que l'extrémité distale du raccord d'électrode est formée avec une pluralité d'étages, et où le raccord d'électrode est axialement sollicité pour forcer les étages dans la bobine hélicoïdale à s'engager entre elles, reliant ainsi le fil conducteur et le raccord d'électrode ensemble.
  21. Procédé de fabrication d'une bougie de préchauffage à dispositif de chauffage en céramique selon l'une des revendications 15 et 16, dans lequel le fil conducteur (10) relié à l'électrode de l'élément de chauffage a une extrémité qui est enroulée en hélice tandis que l'extrémité distale du raccord d'électrode est formée avec des filetages et où le raccord d'électrode est mis en rotation autour de son axe pour forcer les filetages à s'engager par filetage avec la bobine hélicoïdale, reliant ainsi le fil conducteur et le raccord d'électrode ensemble.
EP01976690.6A 2000-10-17 2001-10-15 Bougie de prechauffage en ceramique et procede de production de cette derniere Expired - Lifetime EP1328138B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2000317079 2000-10-17
JP2000317079 2000-10-17
JP2001228361A JP3589206B2 (ja) 2000-10-17 2001-07-27 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。
JP2001228361 2001-07-27
PCT/JP2001/009043 WO2002033149A1 (fr) 2000-10-17 2001-10-15 Bougie de prechauffage en ceramique et procede de production de cette derniere

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EP1328138A1 EP1328138A1 (fr) 2003-07-16
EP1328138A4 EP1328138A4 (fr) 2009-04-08
EP1328138B1 true EP1328138B1 (fr) 2015-07-15

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EP (1) EP1328138B1 (fr)
JP (1) JP3589206B2 (fr)
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EP1707883B1 (fr) * 2003-12-19 2018-10-24 Bosch Corporation Bougie à incandescence en céramique
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
JP5329984B2 (ja) * 2009-01-09 2013-10-30 日本特殊陶業株式会社 シースヒータ用シースチューブの製造方法
DE102009048643B4 (de) * 2009-09-30 2013-11-28 Borgwarner Beru Systems Gmbh Glühkerze und Verfahren zum Verbinden eines Stifts aus einer Funktionskeramik mit einer Metallhülse
ITRM20110271A1 (it) * 2011-05-31 2012-12-01 I R C A S P A Ind Resistenz E Corazzate E Resistenza corazzata a due puntali di elettrodomestico
JP5965180B2 (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
EP2725298B1 (fr) * 2012-10-26 2017-11-22 SIEVA d.o.o., PE Spodnja Idrija Procédé de fabrication d'une bougie de préchauffage à bimatériau
JP6081836B2 (ja) * 2013-03-23 2017-02-15 京セラ株式会社 セラミックヒータ
DE102014226433A1 (de) 2014-12-18 2016-06-23 Robert Bosch Gmbh Elektrisches Heizelement und Kontaktierung mit verbesserter Haltbarkeit
CN106793193B (zh) * 2015-04-08 2020-08-14 无锡国威陶瓷电器有限公司 一种热敏陶瓷发热器
JP7261650B2 (ja) * 2019-04-19 2023-04-20 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
KR102260492B1 (ko) 2019-04-25 2021-06-03 이태건 지게차용 클램프장치
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
KR102412860B1 (ko) 2020-07-14 2022-06-23 이태건 지게차용 클램프장치

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JPS6226419A (ja) * 1985-07-29 1987-02-04 Ngk Spark Plug Co Ltd シ−ズ型グロ−プラグ
JPS6234651U (fr) * 1985-08-12 1987-02-28
JPS63311022A (ja) * 1987-06-09 1988-12-19 Ngk Spark Plug Co Ltd セラミツクグロ−プラグ
JPH08210638A (ja) * 1995-02-02 1996-08-20 Jidosha Kiki Co Ltd ディーゼルエンジン用グロープラグ
JPH09112904A (ja) * 1995-10-19 1997-05-02 Jidosha Kiki Co Ltd ディーゼルエンジン用グロープラグ
JPH10332149A (ja) * 1997-03-31 1998-12-15 Ngk Spark Plug Co Ltd セラミックヒータ
JPH1194251A (ja) * 1997-09-19 1999-04-09 Denso Corp グロープラグ及びその製造方法
JP3655499B2 (ja) 1998-08-11 2005-06-02 株式会社ボッシュオートモーティブシステム セラミックヒータ型グロープラグおよびその製造方法

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JP2002195559A (ja) 2002-07-10
KR20030014727A (ko) 2003-02-19
WO2002033149A1 (fr) 2002-04-25
EP1328138A1 (fr) 2003-07-16
JP3589206B2 (ja) 2004-11-17
EP1328138A4 (fr) 2009-04-08
KR100449203B1 (ko) 2004-09-18

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