WO2002033149A1 - Ceramic heater type glow plug and method of manufacturing the glow plug - Google Patents

Abstract

A ceramic heat type glow plug and a method of manufacturing the glow plug; the glow plug, comprising a ceramic heater (6) having a heating element held by an insulating ceramic and a negative side lead of the heating element exposed to the outside from the side of the heater and electrically connected to a metal outer tube (8) and a positive side lead (10) taken out from the end face of the heater on the side apart from the heating element to the outside and connected to an electrode extraction hardware (12); the method of manufacturing the glow plug, comprising the steps of connecting the ceramic heater near one end part of the metal outer tube to position the connection part between the lead and the electrode extraction hardware in the metal outer tube, filling heat resistant insulating powder (14) into a space inside the metal outer tube, increasing the density thereof by swaging, fixing the electrode extraction hardware to the metal outer tube, and fixing the swaged portion of the metal outer tube to the inside hole (4) of a housing, whereby the holding structure for the lead and the electrode extraction hardware can be simplified, and a tightening torque to an external connection terminal (18) can be received by the fixing part of the metal outer tube to the housing (2).

Description

 Description Ceramic ceramic type plug and its manufacturing method. Technical field

 The present invention relates to a glow plug used as a starting aid for diesel engines, and more particularly to a ceramic heater type glow plug using a ceramic heater as a heating element and a method of manufacturing the same. Background art

 As a ceramic heater, a coil of high melting point metal (for example, stainless steel), a heating element of conductive ceramics, or a heating element in the form of a film is embedded in insulating ceramics. Part of the heating element, take out the lead wire on the negative electrode side of the heating element from the side surface of the insulating ceramic, connect it to the metal outer cylinder, and move the lead wire on the positive electrode side away from the heating element of the insulating ceramic. There has been conventionally known a configuration in which an external connection terminal is connected to one end of an electrode extraction metal fitting, and further connected to one end of the electrode extraction metal fitting, from the end face on the other side.

 When the positive lead wire protruding from the end face of the ceramic heater is connected to a heating element in the insulating ceramic, a mounting hole is provided on the end face of the insulating ceramic. The connection to the heating element is made, but the size of the mounting hole is limited, the diameter of the lead wire cannot be increased, and the lead wire cannot have rigidity. Also, when connecting the heating element and the lead wire at the end face of the ceramic heater, it is difficult to increase the strength of the connection. In addition, insulating ceramics are brittle and cannot receive large forces. Therefore, the tightening torque for connecting a power supply (battery) to the external connection terminal cannot be received by the lead wire.

As a result, in order to be able to receive the tightening torque at the time of battery connection, the electrode extraction metal 取 り 出 し, the connection of external connection terminals, and the fixing structure to the housing, etc. However, there is a risk that the size will be complicated and large.

 In addition, it is necessary to have a structure that can withstand the vibration of the engine, and there is a concern that the fixing of the electrode extraction bracket and the external connection terminal may become large.

 Furthermore, in recent years, direct injection of diesel engines has been promoted in order to comply with exhaust gas regulations, and in order to cope with this, the diameter and length of the glow plugs have been required. In order to respond to such demands, the diameter of the components that pass through the housing during assembly is reduced, so that the housing is reduced in diameter while ensuring the strength of the housing, and the battery terminals are connected to the external connection terminals. It is necessary to secure sufficient tightening torque and strength to withstand engine vibration.

 However, in the case of a sheath-type heater that has been widely used as a heating element of a glow plug for diesel engines, the electrode extraction metal fitting is fixed inside the sheath by swaging, so that this electrode extraction metal fitting is used. The tightening torque to the external connection terminals and the strength against engine vibration are ensured. On the other hand, the ceramic heater has a problem that it is difficult to secure the strength because the lead wire taken out from the end face is thin.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and simplifies a holding structure of a lead wire taken out from an end face of a ceramic heater and a housing of an electrode takeout fitting connected to the lead wire, and external connection. An object of the present invention is to provide a glow plug provided with a ceramic heater and a screw which can secure sufficient strength against tightening torque to a terminal and vibration of an engine. Disclosure of the invention

A ceramic heater plug according to the present invention includes a ceramic heater formed of insulative ceramics and an inorganic conductor, and the ceramic heater is fixed in one end and the other end is fixed to an internal hole of the housing. A metal outer cylinder, and an electrode extraction fitting connected to one of the lead wires protruding from an end face of the heating element of the ceramics heater located in the metal outer cylinder, In particular, the electrode take-out fitting is formed of a rigid body, and a connection portion between the electrode take-out fitting and a lead wire of the front heating element is accommodated in the metal outer cylinder, The extension metal fitting is fixed to the metal outer cylinder via an insulator.

 According to the invention, since the lead wire for electrode extraction and the electrode extraction metal fitting are fixed to the metal outer cylinder via the insulator, the electrode extraction metal fitting is reliably insulated, and the holding structure for the housing is provided. Can be simplified, and costs can be reduced. Further, since the tightening torque for the external connection terminal is received at the press-fitting portion of the metal outer cylinder into the housing via the rigid electrode extraction fitting, the structure of the fixing portion of the external connection terminal can be simplified. Furthermore, there is no problem of cutting due to vibration or intrusion of water, and there is no danger of the ceramic heater being penetrated by vibration, heat cycles, cylinder internal pressure, etc., or damaged by external force. Further, even when an excessive external force is applied to the external connection terminal, it is not transmitted to the ceramic heater, so that the ceramic heater can be prevented from being damaged. Further, since the lead wire for extracting the electrode can be shortened, heat generation of the lead wire can be suppressed, and power consumption can be reduced. In addition, since the structure can be almost the same as that of the sheath-type glow plug, parts and assembly equipment can be shared to reduce costs.

 The invention according to claim 2 is the invention according to claim 1, wherein a hole is formed in an end surface of the electrode extraction fitting, and one end of the lead wire is formed in the hole. It is characterized by being inserted and connected.

 The invention according to claim 3 is the invention according to claim 2, wherein the insertion hole is a through hole that passes through the electrode extraction metal fitting in the axial direction, and the lead wire is inserted into the through hole. The connection with the lead wire is performed by plastically deforming the outer periphery of the electrode extraction metal fitting.

 According to a fourth aspect of the present invention, in the first aspect of the present invention, the tip side surface of the lead wire is abutted and connected to the tip side surface of the electrode extraction fitting. Things.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, a step is formed at a distal end of the electrode extraction metal fitting, and a side surface of the leading end of the lead wire is brought into contact with the step and connected. It is characterized by having been done. According to a sixth aspect of the present invention, in the first aspect of the present invention, the lead wire and the electrode extraction metal fitting are connected by a connecting member.

 The invention according to claim 7 is the invention according to claim 1, wherein a hollow pipe member is used as the electrode lead-out lead wire. The invention according to claim 8 is the invention according to claim 1, characterized in that a hollow pipe member having a slit is used as the lead wire for taking out the electrode.

 In the invention in which the hollow pipe described in claims 7 and 8 is used as a lead wire for taking out an electrode, the hollow pipe is inserted into a mounting hole formed at the end of the ceramic heater and joined by brazing. In this case, the air inside the mounting hole is discharged smoothly, so that air bubbles generated inside are reduced.

 According to a ninth aspect of the present invention, in the invention according to any one of the first, seventh, and eighth aspects, the tip of the lead wire is formed in a coil shape, and the electrode is formed on the coil portion. It is characterized in that it is connected by inserting the tip of the take-out fitting.

 The invention according to claim 10 is the invention according to claim 7 or claim 8, wherein the end of the hollow pipe-shaped lead wire is fitted to the end of an electrode extraction metal fitting. A connection part is formed.

 According to the tenth aspect of the present invention, in addition to having the same effects as the inventions of the seventh and eighth aspects, in addition to the above, the electrode take-out fitting and the lead can be easily and reliably secured from outside the metal outer cylinder. Can be connected.

 The invention according to claim 11 is the invention according to any one of claims 1, 7, and 项 and 8, wherein an end of the electrode take-out lead wire is spirally wound, and It is characterized in that a plurality of steps are formed at the tip of the take-out fitting, and these steps are engaged with the unevenness of the helical portion to connect these two.

The invention according to claim 12 is the invention according to any one of claims 1, 7 and 8, wherein the end of the electrode lead wire is spirally wound, and A screw is formed at the tip of the take-out bracket, and this screw is screwed into the spiral. Thus, the two are connected.

 According to the inventions described in claims 11 and 12, the electrode take-out fitting and the electrode take-out lead wire can be reliably and easily connected so as not to be disconnected. Connection can be made reliably.

 The invention according to claim 13 is characterized in that, in the ceramic plug of the invention, the elastic sealing member is provided at an opening on the electrode take-out fitting side of the metal outer cylinder. It is characterized by being fitted.

 According to a fourteenth aspect of the present invention, in the ceramic ceramic single-ended glow plug according to the first aspect of the invention, the metal outer cylinder includes a small-diameter portion and a portion having a larger diameter than the small-diameter portion. The ceramic heater has a stepped pipe, and an end face of the ceramic heater located in a metal outer cylinder is arranged in the large-diameter portion.

 The invention according to claim 15 relates to a manufacturing method for manufacturing the ceramic heater according to each of the claims, and particularly, a lead wire protruding from an end face of the ceramic heater and the electrode extraction metal fitting. Connecting the ceramic heater to one end of the metal outer cylinder, and filling a heat-resistant insulating powder from the other end of the metal outer cylinder. Fixing the electrode take-out fitting to the metal outer case by reducing the outer peripheral portion of the metal outer case in which the lead wire and the electrode take-out member are housed by swaging. Are sequentially performed.

 An invention method according to claim 16 also relates to a method for manufacturing the ceramic heater described in each of the claims, and particularly, the ceramic heater is disposed in one end of the metal outer cylinder. Fixing, connecting a lead wire protruding from an end face of the ceramic heater to the electrode extraction fitting, filling a heat-resistant insulating powder from the other end of the metal outer cylinder, The outer peripheral portion of the metal outer cylinder in which the lead wire and the electrode take-out fitting are accommodated is reduced in diameter by swaging to fix the electrode take-out fitting to the metal take-up cylinder. And performing the following steps.

According to the investigation method, the part of the gold-made outer cylinder that is pressed into the housing is swaged. Since it is formed by jing processing, dimensional accuracy can be ensured and press-fitting is stable. In addition, since welding and swaging for connecting the electrode lead-out lead and the electrode lead-out fitting can be omitted, assemblability and productivity can be improved and cost can be reduced.

 The method according to claim 17 is the manufacturing method according to claim 16, wherein the ceramic sheath is fixed in one end of the metal outer cylinder, and one end of the lead wire is fixed. It is characterized by being connected to the ceramic heater.

 The method according to claim 18, wherein, in each of the manufacturing methods, an outer diameter of a portion of the metal outer cylinder that is subjected to the swaging process before swaging is set outside of a portion to which the ceramic heater is fixed. It is characterized in that it is formed to have a larger diameter than the diameter.

 The method according to claim 19, wherein in each of the manufacturing methods, after the step of filling a heat-resistant insulating powder from the other end of the metal outer cylinder, the electrode of the metal outer cylinder is taken out. It is characterized in that an elastic seal member is fitted to the opening on the side of the metal fitting.

 According to a second aspect of the present invention, in the method according to the first or second aspect, the end portion of the electrode lead-out wire is spirally wound and an electrode take-out fitting is provided. A plurality of steps are formed at the front end of the electrode, and the electrode extraction fitting is pressed in the axial direction to push the steps into the helical portion and engage with each other to connect the two.

 The invention method according to claim 21 is the method according to any one of claims 15 and 16, wherein the end of the electrode lead wire is spirally wound, and the electrode take-out fitting is provided. A screw portion is formed at the tip, and the electrode take-out fitting is rotated to screw the screw portion into the helical portion to quickly connect the two. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a ceramic heater-type glow plug according to an embodiment of the present invention. It is a longitudinal cross-sectional view.

 FIG. 2 is a view showing an example of a connection structure between a lead wire of a ceramic heater and an electrode extraction metal fitting.

 FIG. 3 is a view sequentially showing an assembling procedure of the ceramics-type glow plug.

 FIG. 4 is a diagram showing an example of a sub-assembly in which a lead wire of a ceramic heater is connected to an external connection terminal.

 FIG. 5 is a diagram showing another example of a connection structure between a lead wire of a ceramic heater and an electrode extraction metal fitting.

 FIG. 6 is a diagram showing a procedure for assembling a ceramic heater type glow plug according to a second embodiment.

 FIG. 7 is a diagram showing another example of the sub-assembly in which the lead wires of the ceramic heater are connected to external connection terminals.

 FIG. 8 is a diagram showing a first half of an assembling procedure of a ceramics heater type global plug according to a third embodiment.

 FIG. 9 is a view showing a step following the step of assembling the ceramic heater type glow plug according to the third embodiment following FIG.

 FIG. 10 is a diagram showing a third example of the sub assembly in which the lead wires of the ceramic heater are connected to the external connection terminals.

 FIG. 11 is a diagram showing the first half of a procedure for assembling a ceramics-type glow plug according to a fourth embodiment.

 FIG. 12 is a view showing a step following the step shown in FIG. 11 of an assembling procedure of the ceramics plug-in-type glow plug according to the fourth embodiment.

 FIG. 13 is a diagram showing a fourth example of a sub-assembly in which a ceramic lead wire is connected to an external connection terminal.

 FIG. 14 is a diagram showing the first half of the procedure for assembling the ceramics-type glow plug according to the fifth embodiment.

FIG. 15 is a view showing a step following the step shown in FIG. 14 of the procedure for assembling the ceramics glass plug according to the fifth embodiment. FIG. 16 is a diagram showing a fifth example of a sub assembly in which a lead wire of a ceramic heater is connected to an external connection terminal.

 FIG. 17 is a diagram showing the first half of the steps of assembling a ceramics head type glow plug according to the sixth embodiment.

 FIG. 18 is a view showing a step following the step shown in FIG. 17 of the procedure for assembling the ceramics-type glow plug according to the sixth embodiment.

 FIG. 19 is a diagram showing a sixth example of a subassembly in which ceramic ceramic lead wires are connected to external connection terminals.

 FIG. 20 is a diagram showing the first half of the procedure for assembling the ceramics-type glow plug according to the seventh embodiment.

 FIG. 21 is a view showing a step following the step shown in FIG. 20 of the procedure for assembling the ceramics heater type glow plug according to the seventh embodiment.

 FIG. 22 is a diagram showing a seventh example of a sub assembly in which a lead wire of a ceramic heater is connected to an external connection terminal.

 FIG. 23 is a longitudinal sectional view showing a state in which the ceramic heater type glow plug according to the eighth embodiment is being assembled.

 Fig. 24 is a diagram showing an example of a lead wire for taking out an electrode. Fig. (A) is a front view of a hollow pipe, Fig. (B) is a side view thereof, and Fig. (C) is a front view of a slit hollow pipe. Figure and Figure (d) are side views.

 FIG. 25 is a longitudinal sectional view showing a state in which the ceramic plug of the ninth embodiment is in the process of being assembled.

 FIG. 26 shows a state in which the ceramic heater type glow plug according to the tenth embodiment is being assembled, and FIG. 26 (a) shows the connection between the electrode lead wire and the electrode lead metal fitting. Before and Figure (b) shows after connection.

 FIG. 27 shows a state in the course of assembling the ceramic heater-type glow plug according to the first embodiment. FIG. 27 (a) shows the connection between the electrode lead-out wire and the electrode lead-out fitting. Before connection, Fig. (B) shows the state after connection.

FIG. 28 sequentially shows a state in the course of assembling the ceramic heater type glow plug according to the 12th embodiment. FIG. 29 sequentially shows the ceramic heater-type glow plug according to the thirteenth embodiment in the state of being in the L-standing state.

 FIG. 30 sequentially shows a state in which the ceramics plug according to the 14th embodiment is being assembled.

 FIG. 31 shows a state in which the ceramics plug according to the fifteenth embodiment is in the process of being assembled.

 FIG. 32 shows the ceramic heater-type glow plug according to the sixteenth embodiment in the process of being assembled.

 FIG. 33 shows a state in the middle of assembling the ceramics head type glow plug according to the seventeenth embodiment.

 FIG. 34 sequentially shows a state in the course of assembling the ceramics one-time glow plug according to the eighteenth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of a ceramic heater type glow plug according to one embodiment of the present invention. The housing 2 of this glow plug has a cylindrical shape, and the inner hole 4 has a medium diameter portion 4a on the ceramic heater fixing side on the left side of the figure and a large diameter portion on the right side of the external connection terminal fixing side in the figure. 4c, a stepped axial hole between the middle diameter portion 4a and the large diameter portion 4c is a small diameter portion 4b.

 In a middle diameter portion 4a of the inner hole 4 (stepped axial hole) of the housing 2, a metal outer cylinder 8 to which a ceramic mixer 6 is joined by press-fitting or brazing is inserted. A part of the outer peripheral surface of the metal outer cylinder 8 is fixed to the housing 2 by press-fitting or brazing.

Since Ceramics 6 has a generally known configuration, its internal illustration and detailed description are omitted, but a high melting point metal (for example, tungsten (W)) is placed inside the ceramic insulator that constitutes its main body. ) Is formed into a coil-shaped heat generating wire 6a in which a heat generating portion 6a is embedded. The heat generating portion 6a protrudes from the distal end 8b of the metal outer cylinder 8 to the outside. The end farther from a 6b is made of gold It is located inside the tube 8. In this embodiment, the heating element may be a conductive ceramic or a sheet-like heating element having a low melting point metal, and a part of the heating element of the conductive ceramic may be an insulating ceramic. For example, the ceramic heater 6 may be formed by combining insulative ceramics and an inorganic conductor serving as a heat generator.

 A negative lead wire is connected to one end of the coiled heating wire embedded inside the ceramic heater 6, and a positive lead wire is connected to the other end. The lead wire on the negative electrode side is exposed on the outer surface of the ceramic insulator on the inner side of the metal outer cylinder 8 and is electrically connected to the inner surface of the metal outer cylinder 8 by brazing. On the other hand, the lead wire on the positive electrode side extends to the end face 6 b side of the ceramic heater 6, and is connected to the electrode lead wire 10 inside the end of the ceramic heater 6. The structure in which this lead wire for electrode extraction 10 is connected to the lead wire on the positive electrode side inside the ceramic insulator and extracted to the outside of the ceramic heater is described in Japanese Patent Application Nos. The method described in 0 0 0-1 4 3 9 9 4 or other methods can be applied.

 The leading end 10 a of the electrode lead wire 10 taken out from the end face 6 b of the ceramic heater 6 is connected to the electrode take-out fitting 12 inside the metal outer cylinder 8. The electrode extraction lead wire 10 is a thin wire, while the electrode extraction fitting 12 is made of a rigid body, and has an insertion hole 1 2 formed at the end 12 a of the electrode extraction fitting 12. b Insert the lead 10a of the electrode lead 10 into the inside of b (see Fig. 2 described later), and connect it by brazing or crimping the end 12a of the electrode lead bracket 12. Have been.

 Around the portion of the metal outer cylinder 8 where the electrode lead wire 10 and the electrode lead-out fitting 12 are connected, an insulator 1 made of heat-resistant insulating powder with a high density by swaging. 4 are filled, and the lead wire 10 for taking out the electrode and the metal fitting 12 for taking out the electrode are fixed to the metal outer cylinder 8 via the insulator 14. Further, a seal member 16 is fitted between the inner surface of the opening of the metal outer cylinder 8 and the outer surface of the electrode extraction fitting 12.

The other end of the electrode take-out fitting 12 having one end 12 a fixed inside the metal outer cylinder 8 A portion 12c protrudes outside from the metal outer cylinder 8, and a tip 18a of the external connection terminal 18 is connected to the end portion 12c by a battery welding or the like.

 The sub-assembly consisting of the ceramic heater 6, the metal outer cylinder 8, the electrode take-out fitting 12 and the external connection terminal 18 and the like is attached to the external connection terminal 18 with the battery connection thread 18b first. Insert the housing 2 into the internal hole 4 from the ceramic heater fixing side end (left end in Fig. 1), press-fit the metal outer cylinder 8 to a predetermined position and fix it, or insert it into the internal hole 4 Fix in place by brazing (brazing with silver brazing material). When the subassembly is fixed to the housing 2, the screw portion 18 of the external connection terminal 18 protrudes out of the housing 2.

 After the ceramic heater 6 and the metal outer cylinder 8 are fixed to the housing 2 as described above, the sealing member (〇 ring) starts from the end of the external connection terminal 18 that protrudes from the housing on the thread 18 b side. 20 and the cylindrical insulating bush 22 are fitted together and inserted into the large-diameter portion 4 c of the internal hole 4 of the housing 2. Further, a washer-shaped insulating member 24 is fitted from the outside, and an aluminum nut 26 is tightened and fixed. The large diameter portion 4c of the internal hole 4 of the housing 2 has a tapered surface 4e on the small diameter portion 4b side, and the seal member 20 is moved between the tapered surface 4e and the insulating bush 22. By pressing, the airtightness inside the housing 2 is maintained. The sealing member 20 and the insulating bush 22 can be fixed by caulking the end of the housing 2, but fixing with the aluminum nut 26 does not require a caulking step, and costs are reduced. It is economically advantageous.

 However, the fixing structure of the external connection terminal 18 is not limited to the above-described configurations, and may be fixed by another method. For example, as described in Japanese Patent Application No. 2000-0-084659, an insulating fixing member is provided between the inner surface of the housing 2 and the outer surface of the external connection terminal 18. It is also possible to receive a tightening torque acting on the external connection terminal 18 by the insulating fixing member.

In the ceramic plug having the above configuration, the lead wire 10 for taking out the electrode from the ceramic plate 6 and the metal lead-out fitting 12 connected to the external connection terminal 18 are made of a metal outer cylinder. 8 are connected inside. て い Fixed to the metal outer cylinder 8 by the insulator 14 filled in the outer cylinder 8. Therefore, it is not necessary to perform insulative holding between the electrode lead wire 10 and the electrode lead-out fitting 12, and the holding structure for the housing 2 is simplified, so that the cost can be reduced. In addition, since the tightening torque for the external connection terminal 18 is received by the holding force between the electrode extraction fitting 12 and the insulator 14, the structure of the fixing portion of the external connection terminal 18 is simplified.

 Next, an assembling procedure for fixing the electrode lead wire 10 and the electrode lead-out fitting 12 from the ceramic heater 6 to the metal outer cylinder 8 will be described with reference to FIGS. First, one end 12a of a rigid electrode extraction fitting 12 is connected to the tip 10a of the electrode extraction lead wire 10 extracted from the end face 6b of the ceramic heater 6. The lead wire 10 is a nickel (Ni) wire or a Ni-nickel mild steel wire having a thickness of about Φ0.5 to 1.0 mm. When the outer diameter of the mounting screw portion 2a (see Fig. 1) of the housing 2 is M8, the electrode take-out fitting 12 is about φ2.2 to 2.4 mm, and when the outer diameter is M10. Is about 2.8 mm thick.

 As shown in the enlarged view of FIG. 2, the connection structure between the electrode lead wire 10 and the electrode take-out fitting 12 is formed by forming an insertion hole 12 b at the end 12 a of the electrode take-out fitting 12. The leading end 10a of the lead wire 10 for taking out the electrode is inserted into the insertion hole 12b and connected by brazing or caulking. However, the present invention is not limited to this configuration. As shown in FIG. 5 (a), one end of the tip 12a of the electrode extraction fitting 12 is cut out to form a cutout 12d, and the cutout 12d is formed. The end of the lead wire 10 for electrode extraction 10 a may be brought into contact with the side of the electrode lead 10 a to make contact with the side by welding or the like, and the electrode may be connected as shown in Fig. 5 (b). The side surface of the leading end portion 10a of the electrode lead wire 10 may be brought into contact with the side surface of the leading end portion 12a of the extraction fitting 12 and connected by welding or the like. Further, as shown in FIG. 5 (c), insert the tip 12a of the electrode take-out fitting 12 into one end of the pipe-shaped connecting member 30, and connect the electrode take-out lead wire to the other end. The connection may be made by inserting the tip portion 10a of 10 and caulking, or may be inserted into the connection fitting 30 and connected.

fi f As shown in the figure, the lead wire 10 and the electrode After connecting the metal fittings 12, the ceramic heater 6 is fixed to the metal outer cylinder 8 by brazing or press-fitting, for example, near the end of the ceramic outer cylinder 8 on the fixing side. At this time, of course, the heat generating portion 6 a side of the ceramic heater 6 is exposed to the outside of the metal outer cylinder 8. The metal outer cylinder 8 to which the ceramic heater 6 is fixed has a stepped shape in which a large-diameter portion 8c is formed on the fixed side of the electrode extraction bracket 12 opposite to the side to which the ceramic heater 6 is fixed. The connection part between the electrode lead wire 10 and the electrode lead-out fitting 12 is located in the large diameter portion 8c.

(See Fig. 3 (a)).

 Here, an example of an assembling procedure when the ceramic heater 6 is fixed in the metal outer cylinder 8 by brazing will be briefly described. Set the ceramic heater 6 assembly (see Fig. 2) to which the electrode lead wire 10 and the electrode lead-out fitting 12 are connected to a brazing jig (not shown). A plurality of ceramic heater assemblies are set on the brazing jig and brazing is performed simultaneously. Next, a brazing material (silver brazing material) in which a wire material is wound in a coil shape is set on the end surface of the ceramic mixer 6 located in the metal outer cylinder 8. Further, the metal outer cylinder 8 is fitted to the ceramic heater 6 and set. Then, the brazing material is melted by heating, and brazing of the ceramic heater 6 and the metal outer cylinder 8 is performed.

 After the ceramic heater 6 is fixed in the stepped metal outer cylinder 8, the lead wire 10 for electrode extraction and the electrode extraction metal fitting are taken out of the opening 8 on the large diameter portion 8 c side of the metal outer cylinder 8. Fill the space in which the connection part with 12 is accommodated with heat-resistant insulating powder (for example, magnesium (Mg〇)) 14 (see Fig. 3 (b)). Next, a rubber sealing member (silicon rubber, fluoro rubber, etc.) 16 is inserted into the opening 8 d of the metal outer cylinder 8 (see FIG. 3 (c)). By inserting the sealing member 16 into the opening 8d of the metal outer cylinder 8, it is possible to prevent the heat-resistant insulating powder 14 from spilling when swaging is performed in a later step. In addition, it is possible to prevent the electrode fittings 12 from coming into contact with the metal outer cylinder 8. Then, caulk the end of the metal outer cylinder 8

(Refer to reference numeral 8e in FIG. 3 (d)), so that the sealing member 16 does not fall off. As shown in FIG. 3 (d), the heat-resistant insulating powder 14 was filled into the metal outer cylinder 8, the sealing member 16 was inserted, and the end 8 e of the metal outer cylinder 8 was caulked. After that, remove the electrode The ceramic shell 6 was determined by swaging the large metal part 8 c of the metal outer cylinder 8 that houses the connection between the lead wire 10 and the electrode extraction fitting 12. Reduce the diameter so that it is almost the same as the part where it is. By reducing the outer diameter of the metal outer cylinder 8 by swaging as described above, the density of the heat-resistant insulating powder 14 is increased, and the electrode extraction bracket 12 is fixed in the metal outer cylinder 8 ( See Fig. 3 (e)). The outer diameter of the reduced diameter portion may be slightly larger than the outer diameter of the portion where the ceramic heater 6 is fixed, or may be smaller.

 One end 18a of the external connection terminal 18 is fixed to the outer end 12c of the metal fitting 12 fixed to the metal outer cylinder 8 by swaging as described above (for example, butt welding). See Figure 4). By inserting the sub-assembly shown in Fig. 4 (Ceramics 6, Metal outer cylinder 8, Electrode extraction bracket 12, External connection terminal 18) into the housing 2 and fixing it as described above, the ceramic heater type Gross plug is assembled.

 In the ceramic heater type glow plug having the above-described structure, the press-fit portion of the metal outer cylinder 8 into the housing 2 is formed by swaging, so that dimensional accuracy can be ensured, and press-fitability is stabilized. In addition, since the lead wire 10 for taking out the electrode of the ceramic heater 6 is embedded in the heat-resistant insulating powder 14, there is no danger of cutting due to vibration, and it can cope with water intrusion. . Further, the heat-resistant insulating powder 14 can prevent the ceramic heat sink 6 from entering the metal outer cylinder 8 due to vibration, heat cycle, cylinder pressure and the like. Further, even when an excessive external force is applied to the external connection terminal 18, it is not transmitted to the ceramic heater 6, so that the ceramic heater 6 can be prevented from being damaged. Further, since the electrode lead wire 10 can be shortened, heat generation of the lead wire 10 can be suppressed, and current consumption can be reduced. Furthermore, since the structure can be made almost the same as that of the sheath-type glow plug, parts and assembly equipment can be shared to reduce costs.

In the embodiment, the sealing member 16 is inserted into the opening 8d of the metal outer cylinder 8 to perform the swaging process. However, the mounting of the sealing member 16 may be omitted. Out come. In this case, when the metal outer cylinder 8 is molded, the opening side end is inclined inward and molded, or the opening side end is crimped and inclined inward before swaging. Thus, by making the opening 8 d of the metal outer cylinder 8 narrow, it is possible to prevent the heat-resistant insulating powder 14 from spilling during swaging. Further, in the above configuration, the tightening torque for the external connection terminal 18 is held by the electrode extraction fitting 12, the heat-resistant insulating powder 14, the metal outer cylinder 8, and the housing 2. When the diameter of the mounting screw portion 2a of the housing 2 is, for example, M10, the diameter of each of the members can be increased to some extent, so that sufficient strength can be secured with this configuration. However, if the diameter of the mounting screw portion 2a is, for example, M8, the electrode extraction bracket 12 becomes thinner as described above. There is. In this case, the external connection terminal 18 may be fixed to the housing with an insulating fixing member as described above (see paragraph 042).

 In the above-described embodiment, the shape of the metal outer cylinder 8 before the swaging process is changed to a stepped shape having a large-diameter portion 8 c having an enlarged outer diameter of the electrode extraction fitting 12, and after the swaging process, the ceramic is formed. Although the diameter is set to be substantially the same as or slightly larger than the heater fixed side, a metal outer cylinder having the same diameter over the entire length before swaging can be used.

 The assembly procedure of the second embodiment using the metal outer cylinder 108 having the same diameter over the entire length will be described with reference to FIGS. Since the configuration of the parts other than the metal outer cylinder 108 is the same as that of the first embodiment, the same parts will be described with the same reference numerals. After connecting the electrode extraction lead wire 10 of the ceramic heater 6 and the electrode extraction bracket 12 (see Fig. 2), the ceramic heater 6 is fixed to the metal outer cylinder 108 with the ceramic heater fixed side by brazing. (See Fig. 6 (a)). The connection between the electrode lead wire 10 of the ceramic heater 6 and the electrode lead-out fitting 12 was made in the same manner as in the above embodiment (FIG. 5 (a),

(See (b) and (c)).

Fill the inside of the electrode take-out fitting 12 of the gold-made outer cylinder 108 with the heat-resistant pre-recorded powder 14 from the open part 108 d (see Fig. 6 (b)). The opening 1 0 8 d — Insert the ruler member 16 (see Fig. 6 (c)). Then, the opening portion 108d of the metal outer cylinder 108 is crimped from the outside (see reference numeral 108e in FIG. 6D) to prevent the sealing member 16 from falling off. After that, the part 108 f filled with the heat-resistant insulating powder 14 of the metal outer cylinder 108 is swaged to shrink, and the density of the heat-resistant insulating powder 14 is increased. Fix the take-out fitting 12 inside the metal outer cylinder 108.

 After the swaging process, the part 108 f of the metal outer cylinder 108 on the electrode extraction fitting 12 side becomes smaller in diameter than the part where the ceramic heater 6 is fixed. Must be larger than the outer diameter of Since the swaged portion 108 f of the metal outer cylinder 108 becomes a press-fit portion into the internal hole 4 of the housing 2, the outer diameter of this portion 108 f is outside the external connection terminal 18. If the diameter is smaller than the diameter, the external connection terminal 18 cannot pass through the inside hole 4 of the housing 2. For this purpose, the outer diameter of the metal outer cylinder 108 after swaging is made larger than the outer diameter of the external connection terminal I8.

The electrode take-out fitting 12 of the metal outer cylinder 108 is swaged to increase the density of the heat-resistant insulating powder 14 filled therein, and the electrode take-out fitting 12 is After fixing it to the metal outer cylinder 108, connect one end 18a of the external connection terminal 18 to the external end 12c of the electrode take-out bracket 12 by means of, for example, battery welding (see Fig. 7). ). The subassembly shown in FIG. 7 is assembled to the housing 2 in the same process as in the first embodiment, and a ceramic heater type global plug is assembled. It is to be noted that a metal outer cylinder 108 (see FIG. 6) having a straight shape (having the same diameter over the entire length) is provided, rather than a stepped metal outer cylinder 8 having a large-diameter portion 8c as in the above embodiment. Although it is more cost effective to use it, the ceramic heater that affects the temperature rise characteristics of the glow plug depends on the diameter (M8 or M10) of the mounting screw 2a of the housing 2. Depending on the outer diameter of 6 and the outer diameter of the external connection terminal 18, it is necessary to use a stepped metal outer cylinder 8, so if necessary, the shape of the metal outer cylinder 8, 108 May be appropriately selected. Further, in the case of the straight metal outer cylinder 108, the gap between the inner surface and the outer surface of the electrode extraction fitting 12 is small, so that the amount of the heat-resistant insulating powder 32 to be filled in the gap is small. In some cases, it is difficult to perform the swaging process because the amount is reduced, and in this case, it is necessary to use a stepped metal outer cylinder 8. further, In the case of the straight metal outer cylinder 108, there is a risk of short-circuiting between the electrode extraction bracket 12 and the metal outer cylinder 108.In this case, insert an insulating hose or the like. This can prevent a short circuit.

 In each of the above embodiments, after connecting the ceramic heater 6 to the lead wire 10 for electrode extraction and the metal fitting 12 for electrode extraction, the ceramic heater 6 is joined to the metal outer cylinder 8 by brazing or the like. Although the metal outer cylinder 8 is filled with the heat-resistant insulating powder 14 to perform the swaging process, a ceramic heater type global plug can be manufactured by other processes.

 FIGS. 8 to 10 are diagrams showing the procedure for assembling the ceramic heater type glove lug according to the third embodiment. In this embodiment, first, the ceramic heater 6 and the metal outer cylinder 8 are connected to each other. After the soldering between the positive electrode side lead wire of the ceramic heater 6 (not shown, but held inside the ceramic heater 6) and the lead wire 10 for electrode extraction simultaneously and integrated, Connect the electrode take-out fitting 12 to the tip of the electrode take-out lead wire 10, and then perform swaging to fix and electrically connect.

 When attaching the ceramic heater 6, the electrode lead wire 10, and the metal outer cylinder 8, as shown in FIG. With the lower part of the metal outer cylinder 8 having the large-diameter portion 8c formed on the upper part of FIG. 8 (FIG. 8), it is set on a brazing jig (not shown). Insert the tip 10b of the electrode lead 10 into the insertion hole where the positive lead wire formed in b is exposed. Then, a silver brazing material obtained by winding a wire in a coil shape is placed on the end surface 6 b in the metal outer cylinder 8 of the ceramic ceramics 6, and heated to a predetermined temperature (for example, 900 ° C.). Melt the brazing material. The molten silver mouth is the gap between the inner surface of the metal outer cylinder 8 and the outer surface of the ceramic heater 6, and the gap between the inner surface of the inlet hole of the ceramic heater 6 and the outer surface of the electrode lead 10. It flows into the gap and is brazed

Next, as shown in FIG. 8 (b), the tip 12 e of the electrode fitting 12 is made thinner, and the electrode taking-out hole 12 f of the lead wire 10 is formed at the tip 12 e. The tip 10a of the lead wire 10 for taking out the electrode is inserted into the insertion hole 12f. insert. Subsequently, the same steps (FIGS. 3 (b) to 3 (e)) as in the above-described embodiment are performed, that is, the heat-resistant insulating powder is placed in the upper space on the large-diameter portion 8c side of the metal outer cylinder 8. 14 (see FIG. 9 (a)), and after inserting the sealing member 16 into the opening 8 d of the metal outer cylinder 8 (see FIG. 9 (b)), end the metal outer cylinder 8. (See FIG. 9 (c).) Then, the large diameter portion 8c of the metal outer cylinder 8 is swaged to prevent the ceramic heater 6 from falling off. (See Fig. 9 (d).) The small-diameter portion 12e at the tip of the electrode extraction bracket 12 is deformed by swaging, and the electrode is removed. It is fixed to the output lead wire 10 to ensure electrical connection.

 One end 18a of the external connection terminal 18 is fixed to the external tip 12c of the electrode extraction fitting 12 fixed in the metal outer cylinder 8 by swaging by butt welding or the like (Fig. 1). 0). Insert the subassembly assembled in this way (ceramic heater 6, metal outer cylinder 8, electrode extraction lead wire 10, electrode extraction metal fitting 12, external connection terminal 18) into housing 2 as described above. To assemble the ceramic heater type glow plug. The ceramic heater type glow plug according to this embodiment can also provide the same effects as those of the glow plugs of the above embodiments.

Further, in the assembling procedure of this embodiment, there is a great advantage in manufacturing as compared with the above embodiment. In the above-described embodiment, after connecting the electrode take-out fitting 12 to the electrode take-out lead wire 10 of the ceramic capacitor 6 first, the ceramic heater 6 is brazed to the metal outer cylinder 8. Therefore, the total length of the ceramic heater assembly is long, making it difficult to perform many brazing operations at once. Lead 10 may bend and require straightening. Furthermore, it is difficult to set the coil-shaped brazing material because the electrode extraction metal fittings 12 are in the way, or it cannot be set if the outer diameter of the electrode extraction metal fittings 12 and the inner diameter of the metal outer cylinder 8 are small. There is also a problem. In addition, since the brazing of the ceramic heater 6 and the lead wire 10 for taking out the electrode and the brazing of the ceramic heater 6 and the metal outer cylinder 8 are performed separately, two brazing steps are required. is necessary. On the other hand, in this embodiment, the brazing of the ceramic heater 6, the metal outer cylinder 8, the ceramic heater 6, and the lead wire 10 for taking out the electrode is performed in one step, Since the swaging process is performed by connecting 1 and 2 (temporary connection is also possible), all the problems in the assembly procedure described above are eliminated.

 FIGS. 11 to 13 are diagrams showing a procedure for assembling a ceramic heater type glow plug according to a fourth embodiment. In addition to reducing the diameter (see Fig. 11 (b), which will be described later), connect one end 10c of the electrode lead wire 10 to the outer diameter of the tip small diameter portion 12a of the electrode extraction bracket 12. It is wound into a coil having approximately the same inner diameter. Then, the ceramic heater 6 and the metal outer cylinder 8 are set in a brazing jig (not shown), and the end opposite to the coil-shaped portion 10 c of the lead wire 10 for electrode extraction is set in the mounting hole of the ceramic heater 6. Insert 10b, and simultaneously braze the ceramic heater 6 and metal outer cylinder 8, and the ceramic heater 6 and the lead wire 10 for electrode extraction (see Fig. 11 (a)).

 Next, the small-diameter portion 12a at the tip of the electrode take-out fitting 12 is inserted into the coil-shaped portion 10c of the electrode take-out lead wire 10 (see FIG. 11B). Thereafter, as in the above embodiments, the upper space having the large-diameter portion 8c of the metal outer cylinder 8 is filled with the heat-resistant insulating powder 14 (see FIG. 12 (a)). Insert the sealing member 16 into the opening 8d of the cylinder 8 (see Fig. 12 (b)), crimp the end 8e of the metal outer cylinder 8 (see Fig. 12 (c)), and Perform each step of swaging the diameter part 8c (see Fig. 12 (d)).

In this embodiment, as shown in FIG. 12D, even after the swaging of the large-sized part 8c of the metal outer cylinder 8, the state of the large-sized part is slightly larger than that of the part to which the ceramic heater 6 is fixed. I have to. However, it is needless to say that the fixed side of the ceramic heater 6 may be the same as in the above embodiment. In addition, irregularities may be provided on the small-diameter portion 12 a at the tip of the electrode extraction fitting 12. If unevenness is provided on the electrode take-out fitting 12 side, the electrode take-out fitting 12 and the coil-shaped portion 10c of the electrode take-out lead wire 10 are more firmly connected, so that there is no possibility of detachment. Then, after fixing one end 18a of the external connection terminal 18 to the outer end 12c of the electrode extraction fitting 12 by butt welding or the like (see Fig. 13), it is assembled to the housing 2 and the ceramic heater is mounted. Manufactures mold plugs.

 Next, a procedure for assembling the ceramic heater-type glow plug according to the fifth embodiment will be described with reference to FIGS. In each of the above-described embodiments, a short lead wire 10 for taking out the electrode is connected to the positive lead wire inside the ceramic heater 6 by mouth and taken out of the ceramic heater 6 to take out the electrode. The electrode take-out fitting 12 was connected to the ends 10 a and 10 c of the lead wire 10 inside the metal outer cylinder 8, but in this embodiment, the ceramic heater 6 Insert one end 10b of a long lead wire 10 for electrode extraction extending to the outside of the metal outer cylinder 8 into the mounting hole where the side surface of the pole side lead wire is exposed, and connect it. (See Figure 14 (a)). The step of connecting the ceramic heater 6 and the metal outer cylinder 8 and the ceramic heater 6 and the electrode lead wire 10 is the same as in the third and fourth embodiments.

 Further, in this embodiment, an electrode extraction metal fitting 12 has an axial through hole 12 g formed therein, and the electrode extraction metal fitting 12 has a through hole 12 g formed in the electrode extraction metal fitting 12. The electrode lead-out wire 10 and the electrode take-out fitting 12 are fixed and electrically connected by passing through 10 and caulking (see HS in FIG. 14 (b)).

As described above, after connecting the electrode extraction fitting 12 to the electrode extraction lead wire 10 extracted outside from the ceramic heater 6, the large diameter of the metal outer cylinder 8 is formed in the same manner as in each of the above embodiments. The space on the part 8c side is filled with heat-resistant insulating powder 14 (see Fig. 15 (a)), and the sealing member 16 is inserted into the opening 8d (see Fig. 15 (b)). Then, the end 8e of the metal outer cylinder 8 is swaged (see FIG. 15 (c)), and the swaging of the large diameter portion 8c (see FIG. 15 (d)) is sequentially performed. Note that the caulking step of the electrode lead-out fitting 12 for fixing the electrode lead-out lead 10 to the electrode lead-out lead 10 is performed by inserting the electrode lead-out lead 10 into the through hole 12 g of the electrode lead-out fitting 12. It may be performed immediately or after the swaging process is completed. Then, cut off the protruding part of the electrode lead wire 10 from the electrode lead-out fitting 12 (Fig. 1 5 (e)).

 After that, the end 18a of the external connection terminal 18 is connected to the end 12c of the electrode extraction bracket 12 by butt welding (see FIG. 16), and the subassembly shown in FIG. Insert and fix it into a ceramic heater type glow plug.

 The assembling procedure of this embodiment is different from that of the third embodiment (FIG. 8) in that a lead wire 10 for taking out an electrode is inserted into a through hole 12 g of a metal fitting 12 and fixed. Although FIG. 10 is similar to FIG. 10), in the third embodiment, since the operation of inserting the electrode lead wire 10 into the electrode lead-out fitting 12 inside the metal outer cylinder 8 is performed, It is difficult to insert the electrode lead wire 10 and it is also difficult to confirm whether or not the electrode lead wire has been inserted. Therefore, a connection error may occur. Since the length of 10 is extended and inserted into the through hole 12 g of the electrode take-out fitting 12 outside the metal outer cylinder 8, it is easy to perform the insertion work, and make sure that the insertion has been done securely. Can be. Therefore, there is no risk of a connection error occurring, which is advantageous for quality control.

 FIGS. 17 to 19 are diagrams showing the procedure for assembling the ceramic heater type glove lug according to the sixth embodiment. In this embodiment, unlike the above-described embodiments, the electrode lead wire 110 connected to the positive electrode side lead wire inside the ceramic capacitor 6 has a thickness having a certain rigidity.

In this embodiment, first, the rigid electrode lead wire 110 and the ceramic heater 6 and the ceramic heater 6 and the metal outer cylinder 8 are connected and fixed by brazing (FIG. 17). (See (a)). Next, from the other end side, the electrode is connected to a pipe-shaped connecting member 30 which is fitted to the tip 12 a of the electrode take-out fitting 12 and fixed by caulking (a caulking portion is denoted by reference numeral 30 a). Insert the tip 110a of the lead wire 110 (see Fig. 17 (b)). The electrode lead wire 110 needs to have such a rigidity that it can be inserted and fitted into the connecting member 30 in this way. After fitting the connection member 30 fixed to the electrode take-out fitting 12 to the tip 1 10 a of the electrode take-out wire 1 10, place it in the space on the large-diameter portion 8 c side in the metal outer cylinder 8. Fill with heat-resistant insulating powder 14 (see Fig. 18 (a)), and then insert sealing member 16 into 8cl, one part. (See Fig. 18 (b)) and after caulking the end 8e of the metal outer cylinder 8 (Fig. 18

(See (c).) Swaging the large diameter portion 8c side of the metal outer cylinder 8 (Fig. 18)

(d)). After that, the outer end 12c of the electrode take-out fitting 12 is connected to the end 18a of the external connection terminal 18 by butt welding (see FIG. 19), and is fixed in the housing 2 and fixed in a ceramic heater-type glow plug. Assemble.

 20 to 22 show a procedure for assembling the ceramic heater type glow plug according to the seventh embodiment. In this embodiment, the positive electrode side lead wire in the ceramic heater 6 is connected to the glow plug. The electrode extraction wire 110 connected has a rigidity enough to press the electrode extraction fitting 12 as described later.

 Also in this embodiment, first, the metal outer cylinder 8 and the ceramics heater 6, and the ceramics heater 6 and the electrode lead wire 110 are simultaneously connected by brazing (see FIG. 20 (a)). Next, a heat-shrinkable tube 32 is attached to the tip 12a of the electrode take-out fitting 12 (see FIG. 20 (b)). At this time, the heat-shrinkable tube 32 is not contracted.

 Next, the tip 12 a of the electrode extraction fitting 12 is pressed against the tip 110 a of the electrode extraction wire 110, and the heat-shrinkable tube 32 is covered around the electrode extraction wire 110. By heating in this state, the heat-shrinkable tube 32 is shrunk and fixed (see FIG. 20 (c)).

Thereafter, the large-diameter portion 8c side space of the metal outer cylinder 8 is filled with the heat-resistant insulating powder 14 (see FIG. 21 (a)), and the sealing member 16 is inserted into the opening 8d (see FIG. 21 (b)). )), And after swaging the end 8e (see Fig. 21 (c)), swaging the large diameter portion 8c (see Fig. 21 (d)). Next, after fixing the end 18a of the external connection terminal 18 to the end 12c of the electrode take-out fitting 12 by butt welding or the like (see FIG. 22), the end 18a is inserted into the housing 2 and fixed. Assemble the mold plug. In the sixth and seventh embodiments, the electrode extraction wire 110 and the electrode extraction metal fitting 12 are connected by the connecting member 30 or the heat shrinkable tube 32 before the swaging process. Connection with 12 becomes more secure. In the third to seventh embodiments (FIGS. 8 to 22), Attach the lead wire 10 on the positive electrode side and the lead wire 10 for taking out the electrode (or the lead wire 11 1) for the inside of the heater 6, the metal outer cylinder 8, and the ceramic heater 6 once. Then, connect the electrode extraction bracket 12 to the electrode extraction lead wire 10 (or the electrode extraction wire 110) (this connection may be a temporary connection), and perform swaging. Fixing and reliable electrical connection eliminates the need for welding or caulking processes between the electrode lead wires 10 and 1 10 and the electrode lead-out fittings 12, reducing the number of steps. Can be. In addition, a larger number of ceramic heaters 6 and metal outer cylinders 8 can be simultaneously brazed than in the first and second embodiments, and the weight of the electrode take-out fittings 12 at the time of opening is reduced. Since it does not cover the electrode lead wire 10, no deformation occurs. Also, it is easy to set the brazing material when brazing, and it is easy to observe the inside after brazing, which is advantageous for quality control. In addition, the use of an electrode fitting 12 having a diameter larger than that of the ceramic heater 6 allows the dimensional conditions to be set freely without impairing the assemblability. In addition, heat treatment can be performed on the electrode take-out fitting 12, and torque can be shared even with a small-diameter glow plug (for example, M 8), thereby avoiding expensive construction methods such as glass sealing. In addition, it has excellent assemblability and productivity, such as only one brazing, and is advantageous in terms of cost.

 FIG. 23 is a longitudinal sectional view showing a state in the middle of assembling the ceramics heater type global plug according to the eighth embodiment. In this embodiment, the positive electrode side reset is provided inside the end of the ceramic heater 6. Electrode take-out lead wire 210 connected to lead wire As in the fourth embodiment (see FIGS. 11 to 13), end portion 210 c connected to electrode take-out fitting The side is coiled. However, in this embodiment, a hollow pipe material is used as the electrode lead wire 210.

Also in this configuration, similarly to the fourth embodiment, the ceramic heater 6 and the metal outer cylinder 8 were set in the brazing jig and formed at the end of the ceramic heater 6. In the mounting hole 6c, insert the end 210b opposite to the coil-shaped portion 210c of the lead wire 210 for taking out the electrode, and insert the ceramic heater 6 and the metal outer cylinder 8, and The ceramic heater 6 and the lead wire 210 for taking out the electrode are simultaneously brazed. Since the electrode lead wire 210 inserted and fixed in the mounting hole 6c of the ceramic heater 6 is hollow, air remaining in the mounting hole 6c during brazing is a hollow passage. 21 Od (see Figures 24 (a) and (b)) and is discharged to the outside. Therefore, it is possible to reduce bubbles generated internally during brazing. As a result, it is possible to suppress an increase in the resistance of the mouth portion, and thus it is possible to prevent a change in glove lug performance. In addition, the airtightness of the brazed part is improved, and the intrusion of moisture, oil, etc., into the heat generator of the ceramic heater can be prevented, and cracks resulting from their vaporization inside the ceramic heater can be prevented. be able to. Further, various effects such as a reduction in the number of holes and pores in the brazing portion and an increase in the connection strength of the electrode extraction fitting can be obtained.

 As described above, after the ceramic heater 6 and the metal outer cylinder 8, and the ceramic heater 6 and the electrode lead wire 210 are joined, the electrode take-out is performed in the same manner as in FIGS. 11 to 13. The small-diameter portion at the tip of the electrode extraction fitting is inserted into the coil-shaped portion 210c of the lead wire 210. Then, heat-resistant insulating powder is filled in the upper space on the large-diameter portion 8c side of the metal outer cylinder 8, and a sealing member is inserted into the opening of the metal outer cylinder 8. Each step of caulking the end of the cylinder 8 and swaging is performed. After that, one end of the external connection terminal is fixed to the outer end of the electrode take-out bracket by, for example, battery welding, and then assembled to the housing to manufacture a ceramic heater type global plug.

 In this embodiment, a hollow pipe 210 in which a circular through passage 2110 d is formed is used as the electrode lead wire 210 (FIG. 24 (a)). (See (b).) However, the present invention is not limited to such a hollow pipe 210. For example, as shown in FIGS. For example, a hollow pipe 310 containing a slit 310e opening to the portion may be used. In any case, when inserted into the mounting hole 6c of the ceramic heater 6 and brazed, a passage 2 through which the air in the mounting hole 6c can be led out of the ceramic heater 6 What is necessary is just to have 10 d and 310 d.

FIG. 25 shows a part of a ceramic heater type glow plug according to the ninth embodiment. In this embodiment, as in the eighth embodiment, electrode extraction is performed. A hollow pipe member 410 is used as a lead wire. The lead wire for electrode extraction 4 10 is provided with a lip-shaped connecting section 4 10 g at the end of a straight thin pipe section 4 10 f. Insert the tip 4 10 b of 0 f into the mounting hole 6 c of the ceramic heater 6 and fix it by brazing. On the other hand, the tip of the electrode take-out fitting is inserted into the lip-shaped connection part 410g at the other end and connected.

 In this embodiment, the tip of the electrode extraction metal fitting is formed so as to have a thickness substantially matching the inner diameter of the connection portion 4100 g of the electrode extraction lead wire 410, and the electrode extraction metal fitting and the electrode extraction metal fitting are formed. After fitting the ends 4 10 g of the lead wires 4 10 g to each other, the same friction as in the above-described embodiments is performed, and heat resistance is set in the upper space having the large-diameter portion 8 c of the metal outer cylinder 8. Filling with a conductive insulating powder, inserting a sealing member into the opening of the metal outer cylinder 8, caulking the end of the metal outer cylinder 8, and performing the steps of swaging. Also in this embodiment, since the hollow pipe member 410 is used as the electrode lead wire, the same effects as in the eighth embodiment can be obtained.

 FIG. 26 shows a part of the assembly process of the glow plug according to the tenth embodiment. In particular, FIG. 26 shows a method of connecting the electrode extraction lead wire 5 10 and the electrode extraction metal fitting 1 12. Has features. Also in this embodiment, the electrode lead wire 5110 uses a hollow pipe-shaped member as in the eighth and ninth embodiments. In the eighth embodiment, however, the end 210 c of the electrode lead-out lead wire 210 on the electrode lead-out fitting connection side is wound in a coil shape at intervals like a spring. However, in the tenth embodiment, the electrode extraction fitting connection end portions 5100 h are spirally wound in close contact with each other.

 On the other hand, the tip 1 1 2 e of the electrode extraction bracket 1 1 2 connected to the spiral section 5 110 h of the electrode extraction lead 5 110 has multiple umbrella-shaped or mushroom-shaped heads. The outer diameter of the portion with the largest diameter (see reference numeral 112 ea in the figure) is larger than the inner diameter of the spiral portion 5110 h of the electrode lead wire 5 10. It is getting a little bigger.

When assembling the ceramic heater-type glow plug according to this embodiment, the hollow plug is inserted into the mounting hole 6c of the ceramic heater 6 as in the above-described embodiments. Insert the end 5110b of the electrode-side lead wire 5100 made of tape material on the straight side, and insert the ceramic heater 6 and the metal outer cylinder 8 and ceramic heater 1 6 and the electrode lead-out lead wire 5110 are joined by brazing. When this brazing is performed, the air in the mounting hole 6c of the ceramic heater 6 is removed in the same manner as in the eighth and ninth embodiments, because the electrode extraction lead wire 5110 is a hollow pipe material. Can be discharged, and a similar effect can be achieved.

 After the ceramic heater 6 and the metal outer cylinder 8 and the ceramic heater and the electrode lead wire 5 10 are joined by the above-mentioned brazing, the electrode take-out fitting: L 1 2 tip 1 1 2 e is connected to the electrode take-out lead. Attaching to the spiral portion 5100h of the wire 5100 and pushing it in the axial direction (vertical direction in the figure) as shown by the arrow A in Fig. 26 (a), the lead wire for electrode extraction Connect 5 10 and the electrode take-out fitting 1 12 (see Fig. 26 (b)). The spiral portion 5110 h of the electrode lead wire 5110 has an irregular surface on the inner surface, and a plurality of large-diameter portions formed at the tip 1 1 2 e of the electrode takeout fitting 1 12. 1 1 2 ea is caught by the unevenness of the inner surface of the helical portion 5 10 h, making it difficult to come off.Therefore, the electrode extraction lead 5 10 and the electrode extraction metal fitting 1 1 2 are securely connected and electrically connected. Connected to. Although a plurality of umbrella-shaped (or mushroom-shaped) heads are provided at the end 1 1 2 e of the electrode extraction bracket 1 12, the shape is not limited to such a shape. What is necessary is just to have a several step part which can be engaged with the inner surface of the spiral part 5100h of this.

 After connecting the electrode extraction lead wire 5 10 and the electrode extraction metal fitting 1 12, perform the same swaging as in the above embodiments, and then assemble it with the housing to manufacture a ceramic heater type glow plug. I do. The method of connecting the electrode lead-out fittings 112 when the electrode lead-out wire 5110 is a hollow pipe member has been described.However, even when an electrode lead-out wire that is not a hollow pipe member is used. By using the configuration shown in FIG. 26, the lead wire for electrode extraction and the metal fitting for electrode extraction can be connected.

FIG. 27 shows a part of the assembling process of the ceramics-type glow plug according to the first embodiment. In this embodiment, as in the tenth embodiment, an electrode extraction hole in which a spiral portion 5100 h is formed at the end of a pipe-shaped member. Lead wire 5110 is used. On the other hand, the tip 2 12 f of the electrode extraction metal fitting 2 12 to which the electrode extraction lead wire 5 10 is electrically connected has a screw shape, and the outer diameter of the screw thread is equal to the electrode extraction space. The inner diameter of the spiral portion 5100h of the spiral line 5110h, which is the unevenness of the wire 5110, is slightly larger than the inner diameter of the convex portion.

 In this embodiment, as shown by an arrow B in FIG. 27 (a), by rotating the electrode extraction metal fittings 212, the spiral portion 5110 h of the electrode extraction lead wire 5110 is rotated. The screw 2 2 2 f at the tip of the electrode take-out fitting 2 1 2 is screwed in along with. To connect the electrode take-out lead wire 5 10 0 to the electrode take-out fitting 2 12. Also in this configuration, the electrode extraction lead wire 5 10 and the electrode extraction metal fitting 2 12 are securely connected and electrically connected. After connecting the electrode extraction lead wire 5 10 and the electrode extraction metal fitting 2 12, the same swaging processing as in each of the above embodiments is performed, and then the ceramic heater type glow is assembled to the housing. Manufacture plugs.

 FIG. 28 shows the procedure for assembling the ceramic heater-type glow plug according to the first embodiment. In particular, the ceramic heater 6 and the electrode take-out fitting 12 are fixed via the metal outer cylinder 208. It is a figure which shows the procedure which performs. In this embodiment, the ceramic heater 6 and the electrode lead wire 10 have the same configuration as that of the fourth embodiment (FIGS. 11 to 13). The shape of the metal outer cylinder 208 to which is fixed, and the mounting positional relationship between the ceramic heater 6 and the metal outer cylinder 208 are different.

 The metal outer cylinder 208 of this embodiment is constituted by a multi-stage pipe having the smallest diameter straight portion 208 a and the enlarged middle diameter portion 208 b and large diameter portion 208 c. The ceramic heater 6 is fixed in the smallest diameter storage portion 208a. In the configuration of the fourth embodiment, the end face 6 b from which the electrode lead 10 of the ceramic heater 6 is taken out is located in the small diameter straight portion of the metal outer cylinder 8. In the embodiment, the end face 6b on the take-out side is located not in the small-diameter straight portion 208a but in the medium-diameter portion 208b.

In this embodiment, one end of an electrode extraction river lead wire 10 (electrode extraction fitting) The end of the 12 side) 10 c is wound into a coil shape having an inside diameter almost the same as the outside diameter of the tip small-diameter portion 12 a of the electrode take-out fitting 12, and a brazing jig (shown in the drawing) is used. The ceramic heater 6 and the gold outer cylinder 208 are set in the inside, and the other end 10 b of the lead wire 10 for taking out the electrode is placed in the mounting hole 6 c of the ceramic heater 6. And brazing them (see Figure 28 (a)). The ceramic heater 6 may be joined to the electrode lead wire 10 and the metal outer cylinder 208 by two brazing steps.

 After connecting the ceramic heater 6, the electrode lead wire 10 and the metal outer cylinder 208 by brazing, the electrode lead-out fitting 1 is inserted into the coiled portion 10c of the electrode lead wire 10. Insert the small-diameter portion 12a formed at the tip of 2 (see Fig. 28 (b)). In this embodiment, an enlarged portion 12h is formed at the tip of the small-diameter portion 12a of the electrode extraction fitting 12 and this enlarged-diameter portion 12h engages with the coil-shaped portion 10c. It is hard to get out.

 Next, the heat-resistant insulating powder 14 is filled into the middle diameter portion 208 b and the large diameter portion 208 c of the metal outer cylinder 208, and the opening of the metal outer cylinder 208 is filled. After the sealing member 16 is inserted into the large diameter portion (see FIG. 28 (c)), the large diameter portion 208c is swaged (see FIG. 28 (d)). By swaging, the diameter of the large-diameter portion 208c of the metal outer cylinder 208 is reduced to a value close to the diameter of the middle-diameter portion 208b. In this embodiment, the connecting portion between the coil-shaped portion 10c of the electrode lead wire 10 and the electrode take-out fitting 12 is located within the large-diameter portion 208c of the metal outer cylinder 208. By reducing the diameter of the large diameter portion 208c by swaging, the electrode extraction lead wire 10 and the electrode extraction metal fitting 12 are securely joined and electrically connected. . After that, one end 18a of the external connection terminal 18 is fixed to the outer end 12c of the electrode extraction fitting 12 by butt welding or the like, and then assembled to the housing 2 to produce a ceramic heater type glow plug. I do.

By the swaging process, the ceramic heater 6 and the electrode extraction fitting 12 can be firmly connected via the metal outer cylinder 208. In addition, the end 6b on the side of the heating element of the heating element 6 from which the positive lead wire is taken out is not a small-diameter straight portion 208a to which the negative lead wire is connected, but Located in the middle diameter part 208 b Therefore, the insulation between the positive electrode and the negative electrode is increased, and the setting of the brazing at the time of brazing becomes easy.

 FIG. 29 is a diagram showing a procedure for assembling the ceramic heater type glow plug according to the thirteenth embodiment. In this embodiment, the electrode extraction lead wire 10 is connected to the ceramic heater 6 side. A cap-shaped connecting portion 10j is formed at an end of the ceramic heater 6 so as to be fitted to the end 6d on the positive electrode side of the ceramic heater 6. Then, the positive electrode side lead wire of the heating element is exposed on the outer surface of the end 6 d of the ceramic heater 6, and the connecting portion 10 j of the lead wire 10 for taking out the electrode is connected to the ceramic heater. By fitting and fixing to the end 6 d of the electrode 6, the ceramic electrode 6 is fixed to the electrode lead wire 10 and electrically connected.

 In this embodiment, similarly to the first and second embodiments, the small-diameter portion formed at the tip of the electrode extraction metal fitting 12 is provided in the coil-shaped portion 10c of the electrode extraction lead wire 10. After insertion and ligation of 12a (see Figure 29 (b)). The middle diameter portion 208 b and the large diameter portion 208 c of the metal outer cylinder 208 are filled with heat-resistant insulating powder 14, and the sealing member 1 is placed in the opening of the metal outer cylinder 208. 6 is inserted (see Fig. 29 (c)), and the large diameter portion 208c is swaged (see Fig. 29 (d)). By this swaging process, the connecting portion 10 j of the ceramic heater 6 and the lead wire 10 for taking out the electrode, the coil-shaped portion 10 c of the lead wire 10 for taking out the electrode and the metal fitting 12 for taking out the electrode are securely joined. I do. After that, one end 18a of the external connection terminal 18 is fixed to the outer end 12c of the electrode extraction fitting 12 by butt welding or the like, and then assembled to the housing 2 to manufacture a ceramic heater type glow plug. .

 FIG. 30 is a diagram showing an assembling procedure of the fourteenth embodiment. In this embodiment, a small-diameter small-diameter wire is connected to the end of the electrode extraction lead wire 10 on the connection side to the ceramic heater 6. A coil-shaped part 10 k is formed. On the other hand, a small-diameter portion 6e is formed at the tip of the ceramic heater 6 on the positive electrode take-out side, and the positive-electrode-side lead wire of the heating element is exposed at the small-diameter portion 6e. By fitting the small-diameter coil-shaped part 10 k of the electrode lead wire 10 k into the small-diameter part 6 e of the ceramic heater 6 and fixing it, the ceramic heater 6 and the electrode lead wire 1 are fixed. Make an electrical connection to 0.

Also in this embodiment, the ceramic heater 6 and the metal After joining with the outer cylinder 208 and connecting the ceramic heater 6 and the lead wire 10 for electrode extraction (see Fig. 30 (a)), the electrode extraction fitting 12 is fitted into the coiled part 10c. Swiftly. Further, the metal outer tube 208 is filled with the heat-resistant insulating powder 14, and the sealing member 16 is inserted into the opening of the metal outer tube 208 (see FIG. 30 (c)), and swaging is performed. (See Figure 30 (d)).

 FIG. 31 is a view showing an assembling procedure of the fifteenth embodiment. The ceramic heater 6 and the lead wire 10 for taking out an electrode are connected in the same structure as in the fourteenth embodiment. . In this embodiment, the configuration of the negative electrode take-out portion of the heating element 36 of the ceramic heater 6 is different from the above-described embodiments. In each of the above embodiments, although not shown, a portion (small-diameter straight portion 208a) where the ceramic heater 6 is joined to the metal outer cylinders 8, 108, 208 is provided at the end of the negative-electrode-side lead wire. Are exposed and are electrically connected to the inner surfaces of the metal outer cylinders 8, 108, 208. On the other hand, in the present embodiment, the negative lead wire 38 of the heating element 36 is located inside the ceramic sheath 6 within the middle diameter portion 208 b of the metal outer tube 208. And an end 38 a thereof is electrically connected to a metal outer cylinder 208 via a conductive ring 40.

 In this embodiment, the ceramic ceramic 6 is joined to the metal outer cylinder 208, and the lead wire 10 for extracting the electrode is fitted to the small-diameter portion 6e of the ceramic heater 6 and connected (see FIG. 31 (a)), insert the tip 12a of the electrode extraction metal fitting 12 into the coiled portion 10c of the electrode extraction lead wire 10 and connect it (see FIG. 31 (b)). The heat-resistant insulating powder 14 is filled in the outer casing 208 made of metal, the sealing member 16 is inserted into the opening of the outer casing 208 made of metal (see FIG. 31 (c)), and swaging is performed. The ceramic heater 6 and the electrode take-out fitting 12 are fixed. (See Figure 31 (d)).

In this embodiment, the negative electrode lead wire 38 is joined to the metal outer tube 208 on the inner side (inside the middle diameter portion 208b) of the metal outer tube 208. This joint moves to the low-temperature side farther from the heating part 6a than when the negative electrode 侧 lead wire is connected to the small diameter straight section of the metal outer cylinder 8, 108, 208. Is less susceptible to the difference in linear expansion coefficient of Joint reliability is increased.

 FIG. 32 is a view showing an assembling procedure of the ceramic heater type glow plug according to the 16th embodiment. In this embodiment, the shape of the ceramic heater 106 is the same as that of each of the above embodiments. It is different from the form. The ceramic heater 106 has a large-diameter portion 106f at the end on the positive electrode take-out side. The shape of the large-diameter portion 106 f substantially matches the shape of the inner surface of the portion that transitions from the middle portion 208 b to the small-diameter portion 208 a of the metal outer cylinder 208.

 Also in this embodiment, the tip 106 e of the large diameter portion 106 6 of the ceramic heater 106 has a small diameter, and the side of the small diameter portion 106 e has a heating element The tip of the positive electrode side lead wire 142 is exposed, and the small-diameter coil-shaped portion 10 k of the electrode lead-out lead wire 10 is fitted and fixed to be electrically connected. In addition, the negative lead wire 1338 is connected to the outer surface of the ceramic heater 106 at a position closer to the large diameter portion 106f of the portion located within the small diameter portion 208a of the metal outer cylinder 208. And is joined to the inner surface of the metal outer cylinder 208 so as to be electrically connected. The ceramic heater 106 having the above shape is inserted from the large-diameter portion 208c side of the metal outer cylinder 208, and the medium-diameter portion 208b and the small-diameter tube of the metal outer cylinder 208 are inserted. After fixing inside the rate part 208 a and fitting the ceramic coil 106 with the small-diameter coil-shaped part 10 k of the lead wire 10 for taking out the electrode (see Fig. 32 (a)) ), Connect the electrode take-out fitting 12 to the coiled part 10c at the other end (see Fig. 32 (b)), and then put the heat-resistant insulating powder 14 inside the metal outer cylinder 208. After filling, the sealing member 16 is inserted into the opening of the metal outer cylinder 208 (see FIG. 32 (c)), and swaging is performed (see FIG. 32 (d)). As described above, the ceramic heater 106 having the thick metal part 106 f formed at the end 侧 located inside the metal outer cylinder 208 can be used as a ceramic heater 106. Positioning is facilitated when brazing the metal outer cylinder 208. In addition, even if an abnormal environment such as abnormal combustion occurs during use as a glow plug, it is possible to prevent the displacement between the metal outer cylinder 208 and the ceramic heater 106, thereby improving reliability. Performance can be improved.

FIG. 33 shows an assembling procedure of the ceramic heater type glow plug according to the seventeenth embodiment. Are different. In the ceramic heater 206, a portion (a heating portion 206a in which a heating element 236 is embedded) protruding outside from a metal outer cylinder 208 has a large diameter. The outer diameter of the large-diameter heat generating portion 206 a substantially matches the outer diameter of the small-diameter portion 208 a of the metal outer cylinder 208.

 In this embodiment, the ceramic heater 206 is inserted from the small diameter straight portion 208 a side of the metal outer cylinder 208, and the ceramic heater 206 and the metal outer cylinder 200 are inserted. 8 and the small-diameter end portion 206 e of the ceramic heater 206 and the small-diameter coil-shaped portion 10 k of the electrode lead wire 10 are connected (see Fig. 33 (a)). The electrode extraction bracket 12 is connected to the coiled portion 10c of the electrode extraction lead wire 10 (see Fig. 33 (b)), and the heat-resistant insulating powder is placed in the metal outer cylinder 208. The body 14 is filled, the sealing member 16 is inserted into the opening of the metal outer cylinder 208 (see FIG. 33 (c)), and swaging is performed (see FIG. 33 (d)). . As described above, the heating portion 206 a of the ceramic heater 206 projecting outside the metal outer cylinder 208 has a large diameter, so that the ceramic heater 206 and the metal outer cylinder 20 Easier positioning when brazing with 8. In addition, the displacement between the ceramic heater 206 and the metal outer cylinder 208 can be prevented.

 FIG. 34 is a diagram showing a procedure for assembling the ceramic heater type glow plug according to the eighteenth embodiment. In each of the above-described embodiments, the ceramic heater 6, 106, 206 Although a thin wire was used as the electrode lead wire 10 for taking out the positive electrode from the heating elements 36, 1 36, and 23 36 and connecting it to the electrode take-out fitting 12 in this embodiment, The positive electrode lead wire (not shown) of the heating element of the ceramics heater 6 and the electrode take-out fitting 12 are joined via a cylindrical fitting 50 and are electrically connected.

The cylindrical metal fitting 50 has a large diameter each of a connecting part 50a on the ceramic heater 6 side and a connecting part 50b on the electrode extracting metal part 12 side. The large-diameter connecting portion 50a on the ceramic heater 6 side has an inner diameter substantially matching or slightly larger than the outer diameter of the end 6d of the ceramic heater 6. In addition, the large-diameter connection portion 50 b on the side connected to the electrode extraction fitting 12 has an inner diameter that substantially matches the outer diameter of the tip 12 a of the electrode extraction fitting 12, or has a larger inside diameter. are doing. In this embodiment, the ceramic heater 6 is inserted into the metal outer cylinder 208 so that the exothermic part 6 a at the tip of the ceramic heater 6 protrudes to the outside, and the end 6 d on the positive electrode take-out side is connected to the middle diameter part 20. 8b, the metal outer cylinder 208 and the ceramic sheath 6 are joined by brazing. Next, the large-diameter connecting portion 50a of the cylindrical fitting 50 is fitted to an end 6d of the ceramic heater 6 located in the metal outer cylinder 208 (see FIG. 34 (a ))). Further, the tip 12a of the electrode take-out fitting 12 is inserted into the large-diameter connection portion 50b at the other end of the cylindrical fitting 50 (see FIG. 34 (b)).

 Then, heat-resistant insulating powder 14 is filled into metal outer cylinder 208, and sealing member 16 is inserted into the opening of metal outer cylinder 208 (see FIG. 34 (c)). Then, a swaging process is performed (see Fig. 34 (cl)). By the swaging, the large-diameter portion 208c of the metal outer cylinder 208 is reduced in diameter, and the cylindrical metal fitting 50 inside the metal outer cylinder 208 is also made of heat-resistant insulating powder. And is firmly joined to the ceramic heater 6 and the electrode extraction fitting 12. Industrial applicability

 As described above, the ceramic heater type glow plug according to the present invention is used for assisting the start of a diesel engine. In particular, glove lugs with a small diameter and a long length are suitable for use in direct injection type multi-valve diesel engines.

Claims

The scope of the claims 1. A ceramic heater formed of remarkable ceramics and an inorganic conductor, a metal outer cylinder in which the ceramic mist is fixed in one end, and the other end is fixed in an inner hole of the housing. A ceramic heater type global plug comprising: an electrode extraction fitting connected to one lead wire protruding from an end surface of the heating element of the ceramic heater, which is protruded from an end surface located in a metal outer cylinder;  The electrode take-out fitting is formed of a rigid body, and a connecting portion between the electrode take-out fitting and the lead wire of the heating element is housed in the metal outer cylinder, and the electrode take-out fitting is placed through an insulator. A ceramic heater-type glow plug fixed to the metal outer cylinder.  2. The ceramic heater type glow plug according to claim 1,  An insertion hole is formed at an end face of the electrode extraction metal fitting, and one end of the lead wire is inserted and connected into the insertion hole. .  3. The ceramic heater-type glow plug according to claim 2,  The insertion hole is a through-hole that penetrates through the electrode take-out in the axial direction. The lead is passed through the through-hole, and the outer periphery of the electrode take-out is plastically deformed to connect with the lead. A ceramic heater type glow plug that specializes in  4. The ceramic heater type glow plug according to claim 1,  A ceramic heater type glow plug, wherein a side surface of a leading end portion of the lead wire is in contact with and connected to a side surface of a leading end portion of the electrode extraction metal fitting.  5. The ceramic heater type glow plug according to claim 4,  A ceramic heater type glow plug, characterized in that a step is formed at the tip of the electrode take-out, and the tip of the lead wire is abutted and connected to the step.  6. The ceramic plug of claim 1, wherein: The electrode take-out fitting and the lead wire are connected by a connecting member. Ceramic plug with a glow plug.  7. The ceramic heater type glow plug according to claim 1,  A ceramic heater type glow plug, wherein a hollow pipe member is used as the lead wire for taking out the electrode.  8. The ceramic heater-type glow plug according to claim 1,  A ceramic heater-type glow plug, wherein a hollow pipe member containing a slit is used as the lead wire for taking out the electrode.  9. The ceramic heater type glow plug according to any one of claims 1, 7 and 8,  A ceramic heater-type gross plug, wherein a tip of the lead wire is formed in a coil shape, and a tip of the electrode extraction fitting is inserted and connected to the coil-shaped portion.  10. In the ceramic heater type glow plug according to claim 7 or claim 8,  A ceramic heater-type glove plug, wherein a cup-shaped connection portion is formed at an end of a hollow pipe-shaped lead wire, to which a tip of an electrode extraction fitting is fitted.  1 1. The ceramic glass plug according to any one of claims 1, 7 and 8,  The end of the lead wire is spirally wound, and a plurality of steps are formed at the tip of the electrode extraction fitting, and the steps are engaged with the unevenness of the spiral to connect the two. Features a ceramic heater type glow plug.  1 2. The ceramic glass plug according to claim 1, claim 7 or claim 8, wherein:  The end portion of the lead wire is spirally wound, a screw portion is formed at the tip of the electrode take-out fitting, and the screw portion is screwed into the spiral portion to block these two portions. And a ceramic heater-type glow plug. 13. The ceramic heater type glow plug according to any one of claims 1 to 12, An elastic sealing member is fitted to an opening of the metal outer cylinder on the side of the electrode take-out fitting.  14. The ceramic heater-type glow plug according to any one of claims 1 to 13,  The metal outer cylinder is constituted by a stepped pipe having a small-diameter portion and a portion having a larger diameter than the small-diameter portion, and the end face located in the metal outer cylinder of the ceramic heater is provided with the large-diameter portion. A ceramic heater type glow plug, which is arranged inside.  15. A method for manufacturing a ceramic heater-type glow plug according to any one of claims 1 to 14,  A step of connecting a lead wire protruding from an end face of the ceramic heater and the electrode extraction metal fitting; a step of fixing the ceramic heater in one end of the metal outer cylinder; and a step of fixing the other side of the metal outer cylinder. A step of filling a heat-resistant insulating powder from an end portion, and reducing the outer peripheral portion of the metal outer cylinder in which the lead wire and the electrode take-out fitting are accommodated by swaging to reduce the diameter of the electrode. And a step of fixing a take-out fitting to the metal outer cylinder.  16. A method for manufacturing a ceramic heater type glow plug according to any one of claims 1 to 14,  Fixing the ceramic heater inside one end of the metal outer cylinder, connecting a lead wire protruding from an end surface of the ceramic heater to the electrode extraction metal fitting, and connecting the other end of the metal outer cylinder to the ceramic heater. A step of filling the heat-resistant insulating powder from the end, and reducing the outer peripheral portion of the metal outer cylinder in which the lead wire and the electrode extraction metal fitting are accommodated by swaging. And a step of fixing the electrode extraction metal fitting to the metal outer cylinder. The method for manufacturing a ceramic heater type glow plug, comprising the steps of:  17. In the method for manufacturing a ceramic heater type glow plug according to claim 16, When the ceramic heater is fixed inside one end of the metal outer cylinder, A method of manufacturing a ceramic heater type global plug, wherein one end of the lead wire is connected to the ceramic heater.  18. The method for manufacturing a ceramic heater-type glow plug according to any one of claims 15 to 17,  A ceramic heater type glow wherein the outer diameter of the portion where the swaging is performed on the metal outer cylinder before swaging is formed to be larger than the outer diameter of a portion to which the ceramic heater is fixed. Plug manufacturing method.  19. The method for manufacturing a ceramic heater type glow plug according to any one of claims 15 to 18,  After the step of filling the heat-resistant insulating powder from the other end of the metal outer cylinder, an elastic seal member is fitted to an opening of the metal outer cylinder on the side of the electrode extraction fitting. Of manufacturing a ceramic heater type glow plug.  20. The method of manufacturing a ceramic heater type glow plug according to claim 15 or claim 16,  While spirally winding the end of the electrode extraction lead wire, forming a plurality of steps at the tip of the electrode extraction metal fitting, pressing the electrode extraction metal fitting in the axial direction, and pushing the step into the spiral to engage. A method of manufacturing a ceramic heater type glow plug, wherein the two are connected to each other.  21. The method for manufacturing a ceramic sintering type glow plug according to claim 15 or claim 16,  The end of the electrode lead wire is spirally wound, a screw is formed at the tip of the electrode take-out, and the screw is screwed into the spiral by rotating the electrode take-out. A method for manufacturing a ceramic plug and a glow plug, wherein the plug is connected.