JP2000173370A - Insulator, central conductor to be arranged inside of insulator, and structure and method for connecting lead wire part using thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the lead wire part connecting structure capable of easily locking the wire without filling resin inside of an insulator. SOLUTION: A lead wire part connecting structure K is provided with an insulator 1. A wire 2 having a central conductor 3 is inserted into a conductor lead-in hole 10 of the insulator 1. A stopper step part 12 is formed with a recessed part 120. The central conductor 3 is provided with an abutment part 32 having a projecting part 320. The recessed part 120 and the projecting part 320 are engaged with each other by screwing a male screw part 40 of a terminal fitting 4 to a female screw part 31. Movement of the insulator 1 or the central conductor 3 in the circumferential direction of an axis is prevented by engaging the recessed part 120 and the projecting part 320 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator, a center conductor disposed inside the insulator, a connecting structure of a lead portion using the same, and a method of connecting the lead portion. More specifically, the present invention relates to an insulator in which a wire and a center conductor can be easily prevented from rotating without filling the inside of the insulator with resin.

[0002]

2. Description of the Related Art For example, a switch for partially blocking a distribution line is installed above a utility pole or the like. In the switch, an insulator, which is a cylindrical insulator, is provided so as to penetrate the device case. Usually, a conductor such as a center conductor or a core wire of an electric wire is disposed inside an insulator so as to be insulated from a device case of a switch.

FIG. 5 shows a conventional connection structure of an outlet portion, and is an explanatory view showing a state where a section other than the electric wire is cross-sectionally shown. Insulator 6
Has a large-diameter conductor introduction hole 60 and a small-diameter metal fitting mounting hole 61.
Are formed continuously in the coaxial line direction. At the boundary between the conductor introduction hole 60 and the metal fitting attachment hole 61, a stop step portion 62 is formed.

[0004] One end of a central conductor 8 is fixed to a core wire 70 at the end of the electric wire 7. At a required position of the central conductor 8, a contact portion 80 that contacts the stop step portion 62 when the central conductor 8 is inserted into the conductor introduction hole 60 is formed.
The surfaces where the stop step portion 62 and the contact portion 80 are in contact with each other are flat.

At the end of the electric wire 7, the center conductor 8 is inserted from the conductor introduction hole 60 into the metal fitting attachment hole 61, the stop step 62 and the contact part 80 are brought into contact with each other. By inserting one end of a terminal fitting 9 connected to the device inside the switch from the outside of the switch, and screwing it into the other end of the center conductor 8,
It is attached to insulator 6.

However, the center conductor 8 and the terminal fitting 9 are configured so that the stop step portion 62 and the abutment portion 80 abut against each other in a planar manner, so that when they are tightened, they slide and rotate together. There is a problem that the fastening work is difficult. Also, even if the wires are sufficiently tightened, there is a danger that the electric wires 7 vibrate due to rain and wind and the like, so that the screw-in state of the center conductor 8 and the terminal fitting 9 is loosened, and the electric wires 7 come off from the insulator 6.

For this reason, conventionally, a resin J having an adhesive property is filled in the conductor introducing hole 60 into which the electric wire 7 is inserted, and the electric wire 7 is fixed to the insulator 6 by the resin J so as not to move. The resin J is a thermosetting resin, and is placed in an electric furnace or the like and cured by heating.

The conductor introduction hole 60 filled with the resin J
Is provided with a friction portion 600 for further strengthening the adhesion of the filled resin J. The friction portion 600 is formed by applying an adhesive to the inner surface and attaching a granular material.

[0009]

However, the above-described conventional connection structure of the lead portion has the following problems. That is, the resin J having thermosetting properties is introduced into the conductor introduction hole 6.
Since the electric wire 7 is prevented from rotating by filling it with 0, a process of forming the frictional portion 600 on the inner surface of the conductor introduction hole 60 and curing the filled resin J in an electric furnace or the like is performed. Necessary and time-consuming to manufacture. Further, in order to completely cure the resin J, it is usually necessary to place the resin J in an electric furnace or the like for about a full day. Therefore, not only does it take much time for production, but also the production management becomes complicated and productivity is poor.

Further, since the electric wire 7 is fixed to the insulator 6 with the resin J and cannot be disassembled after the resin J is cured, only the insulator 6 or the electric wire 7 cannot be replaced. Therefore, the insulator 6 could not be reused.

The present invention has been made to solve the above-mentioned problems, and is provided inside an insulator and an insulator in which a wire or a center conductor can be easily prevented from rotating without filling the inside of the insulator with a resin. An object of the present invention is to provide a center conductor, a connection structure of a lead portion using the same, and a method of connecting the lead portion.

[0012]

Means of the present invention taken to achieve the above object are as follows. According to the first aspect of the present invention, there is provided an insulator which penetrates an equipment case and insulates a conductor disposed therein from the equipment case, wherein the insulator has a through hole formed in an axial direction. A stop portion formed at a required position in the through hole has an engaging portion for cooperating with the engaging portion of the attached center conductor to prevent the center conductor from rotating in the circumferential direction. It is an insulator characterized by having provided.

According to a second aspect of the present invention, there is provided an insulator which penetrates an equipment case so that a conductor disposed therein is insulated from the equipment case. A hole and a small-diameter fitting attachment hole are formed so as to be continuous with each other, and a stop step formed at a boundary between the conductor introduction hole and the fitting attachment hole is provided with a center conductor to be attached. An insulator characterized in that an engagement portion is provided in cooperation with the joint portion to prevent the center conductor from rotating in the axial direction.

In the third aspect, the engaging portion has a concave portion and a convex portion provided in the circumferential direction of the shaft, and a boundary between the concave portion and the convex portion is formed as a curved surface. Characterized by the fact that
An insulator according to the first or second invention.

According to a fourth aspect of the present invention, there is provided a center conductor having a conductor connected to one end thereof and a terminal fitting connected to the other end in a state of being disposed inside the insulator. Has an abutting portion capable of abutting the shaft, and an abutting portion for preventing the center conductor from rotating in the axial direction in cooperation with the engaging portion of the insulator. Characterized in that it is provided,
It is the center conductor.

In the fifth aspect, the engaging portion has a concave portion and a convex portion provided in the axial circumferential direction, and a boundary between the concave portion and the convex portion is formed with a curved surface. Characterized by the fact that
It is a center conductor according to a fourth invention.

According to a sixth aspect, the insulator according to the first or second aspect, the center conductor according to the fourth aspect having a conductor connected to one end, and the other end of the center conductor according to the fourth aspect. And a terminal fitting that cooperates with the center conductor to tighten a stop step portion and a required position of the insulator to fix the center conductor to the insulator. The terminal fitting and the center The conductor is tightened so that the engaging portion of the insulator and the engaging portion of the center conductor are engaged with each other so as to be airtight or substantially airtight, and the insulator or the center conductor moves in the axial circumferential direction. It is a connection structure of an outlet part characterized in that it is not provided.

In a seventh aspect, the insulator according to the third aspect, the center conductor according to the fifth aspect having a conductor connected to one end thereof, and a threaded engagement with the other end of the central conductor. And a terminal fitting for fixing the center conductor to the insulator by tightening the insulator from both ends of the fitting mounting hole in cooperation with the center conductor, wherein the terminal fitting and the center conductor are provided. The concave portion of the insulator and the convex portion of the central conductor, or the convex portion of the insulator and the concave portion of the central conductor are fitted to each other and tightened so as to be airtight or substantially airtight, and the insulator or the center A connection structure for a lead portion, wherein a conductor is prevented from moving in an axial direction.

In the eighth invention, a through hole is formed in the axial direction, and a stop step is provided at a required position in the through hole. , A terminal fitting is inserted from the other of the through holes, the terminal fitting is connected to the center conductor, and the terminal fitting and the center conductor are passed between a required position of the stop step and the insulator. The central conductor is fixed to the insulator in a state where the engaging portion provided on the central conductor and the engaging portion of the stop step are engaged.
This is how to connect the outlet.

Usually, a core wire (conductor) of an electric wire is directly connected to one end of the center conductor. However, a connection fitting may be interposed between one end side of the center conductor and the core of the electric wire as long as the connection conductor includes a conductor. In this case, the connection state between the center conductor and the connection fitting and between the connection fitting and the core wire of the electric wire must be prevented from being loosened by vibration of the electric wire due to rain and wind.

[0021]

In the connecting structure and the connecting method of the lead portion according to the present invention, the terminal fitting and the central conductor are tightened by engaging the engaging portion of the insulator and the engaging portion of the central conductor with each other. The insulator or the center conductor is prevented from moving in the axial direction. Thus, when the center conductor and the terminal fitting are fastened, the surface in contact with the insulator and the center conductor does not slip, and the two do not rotate together. In addition, when the electric wire vibrates due to rain or wind, the connection between the center conductor and the terminal fitting does not loosen. ADVANTAGE OF THE INVENTION According to the connection structure and the connection method of the outlet part which concerns on this invention, even if it does not fill a conductor introduction hole with resin like the prior art, it can fix an electric wire and cannot move.

The center conductor can be detached from the insulator by loosening the terminal fittings and releasing the connection with the center conductor. At this time, the work of loosening the terminal fitting is performed by engaging the engaging portion of the insulator and the engaging portion of the center conductor with each other. It can be easily done because it does not turn around.

The engaging portion has a concave portion and a convex portion provided in the axial direction, and the boundary between the concave portion and the convex portion is formed by a curved surface. Even when the engaging portion of the insulator is not completely engaged with the insulator, the curved surfaces of the engaging portion guide each other by the tightening of the terminal fittings, so that the center conductor slides in the axial circumferential direction while rotating. . Therefore, the engagement portions can be completely engaged with each other naturally.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows a first embodiment of an outlet connection structure according to the present invention, which is attached to a switch to explain a section other than an electric wire, and FIG. 2 is a connection structure of FIG. FIG. 3 is a perspective view showing a central conductor used for the connection structure shown in FIG. 1, and FIG. 3 is a perspective view showing an insulator used for the connection structure shown in FIG.

Reference numeral K1 denotes a connection structure of the outlet (hereinafter referred to as a connection structure).
In the embodiment, the connection structure is simply referred to as “connection structure”). The connection structure K1 includes an insulator 1 formed of an insulator, a center conductor 3, and a terminal fitting 4 connected to a device (not shown) in the switch. A core wire 20 at the end of the electric wire 2 is connected to one end of the central conductor 3. Core wire 20, center conductor 3, and terminal fitting 4 of electric wire 2
Are conductors. The connection structure K1 is attached to the switch through the device case 50.

At the end of the electric wire 2, the outer sheath at the end is peeled off to expose the inner core wire 20. At one end of the center conductor 3, a cylindrical crimping portion 30 is formed. Core wire 20
Are fixed in such a manner that they are included in the crimping portion 30 and mechanically caulked from the outside so as not to come off the center conductor 3 (see FIG. 1). Note that the connection between the end portion of the electric wire 2 and the center conductor 3 is not limited to caulking.
The connection may be made by welding. Also, core wire 2
A screw-in type may be used as long as there is a screw groove attached to 0. However, in the case of the screw-in type, means must be provided so that the screwed state is not loosened by the vibration of the electric wire 2.

On the other end of the center conductor 3, a female screw portion 31 is formed. At a position near the center of the center conductor 3, a contact portion 32 having a diameter larger than the diameter at one end and the other end is provided. The contact portion 32 includes a convex portion 320.
.. And concave portions 321... Which are relatively concave due to the convex portions 320... Are formed alternately and continuously at four locations in the axial circumferential direction (see FIG. 2). Also,
Are formed so as to be curved.

In the insulator 1, a large-diameter conductor introducing hole 10 and a small-diameter metal fitting mounting hole 11 are formed continuously and penetrate in the coaxial line direction. A stop step 12 is formed at the boundary between the conductor introduction hole 10 and the metal fitting hole 11. Stop step 12
Is formed near the center of the insulator 1 in the longitudinal direction. The insulator 1 has the conductor introduction hole 10 located on the outside of the switch, and a packing P between the insulator 1 and the device case 50.
1 so that the airtight state in the device case 50 can be maintained (see FIG. 1).

The stop step 12 has recesses 120.
The convex portion 1 which becomes relatively convex due to the concave portions 120.
21... Alternately and continuously in the axial direction,
Each portion is formed (see FIG. 3). Also, the recess 12
.. And the projections 121... Are formed to be curved.

The center conductor 3 provided at the end of the electric wire 2
Inserts the female screw part 31 on the other end side from the conductor introduction hole 10 into the metal fitting attachment hole 11 and inserts the convex parts 320.
20 and are engaged with each other. A packing P2 is interposed between the contact portion 32 and the stop step portion 12, so that the airtight state in the metal fitting hole 11 can be maintained by connecting the insulator 1 and the center conductor 3.

In the fitting hole 11 (inside the switch),
A terminal fitting 4 is provided. A male screw portion 40 having a required length is formed at one end of the terminal fitting 4. At the base of the male screw portion 40, a disk-shaped flange portion 41 having a packing P3 incorporated on one side is formed. At a required position on the outer peripheral surface of the flange portion 41, a hook hole 4 for hooking a hook portion of a wrench when screwing the terminal fitting 4 is provided.
10 are formed. The other end of the terminal fitting 4 is connected to a terminal unit 4 (not shown) provided in the switch.
2.

The terminal fitting 4 is such that the male screw part 40 is inserted into the metal fitting hole 11, and this is screwed into the female screw part 31. It is attached so as to be in close contact with the end face 13 and maintain an airtight state in the device case 50.

By attaching the terminal fitting 4 in this manner, the fitting mounting hole 11 can be tightened inside and outside the insulator 1 in cooperation with the center conductor 3, and the stop step 1
2 and the contact portion 32 come into pressure contact with each other. When the terminal fitting 4 is screwed in and tightened, a wrench is used. The wrench has a hooking hole 4
It is used by hooking it on 10 and turning it around the shaft.

It is optional to fill the conductor introduction hole 10 with a sealant such as rubber or resin so as to prevent rain or the like from entering the conductor introduction hole 10.

(Operation) The operation of the embodiment of the present invention will be described with reference to FIGS. The connection structure K1 is
The male screw part 40 of the terminal fitting 4 is connected to the female screw part 31 of the center conductor 3.
, And the terminal fitting 4 and the central conductor 3 are tightened in a state where the concave portions 120 of the insulator 1 and the convex portions 320 of the central conductor 3 are engaged with each other.
... and the convex portions 320 are pressed against each other to fit tightly,
The insulator 1 or the center conductor 3 is prevented from moving in the axial direction. Thereby, when the terminal fitting 4 is fastened to the center conductor 3, the surface where the insulator and the center conductor come into contact with each other does not slip and both of them do not rotate together. Further, when the electric wire 2 vibrates due to rain and wind, the screwed state of the center conductor 3 and the terminal fitting 4 is not loosened. As described above, according to the connection structure K1, the conductor introduction hole 10 as in the related art is used.
Even if the resin is not filled in, the electric wire 2 can be fixed so as not to move.

The center conductor 3 can be removed from the insulator 1 by loosening the terminal fitting 4 and releasing the screwed state with the center conductor 3. At this time, the work of loosening the tightening of the terminal fitting 4 is performed by
.. And the projections 320 of the center conductor 3 are fitted to each other, and even if the terminal fitting 4 is turned in the loosening direction, the center conductor 3 does not turn in the circumferential direction of the shaft.

The convex portions 320 of the contact portion 32 and the concave portions 32
1 and recess 120 of stop step 12
Are formed so that the boundary between the convex portions 121 and the convex portions 121 is curved.
Even when they are not completely engaged with each other, the curved surfaces guide each other by the tightening of the terminal fittings 4, and the center conductor 3 rotates while sliding in the axial circumferential direction. Therefore, the convex portions 320... And the concave portions 120.
.. Can be completely fitted to each other.

The stop step portion 12 is formed near a substantially central portion in the length direction of the insulator 1. For this reason, even when a force is applied to the electric wire 2 in the direction of swaying due to rain or wind, the outer edge of the conductor introduction hole 10 comes into contact with the jacket and acts as a stopper for stopping the swaying of the electric wire 2. Has a smaller swing width. As a result, the load on the core wire 20 is reduced, metal fatigue is less likely to occur, and durability is improved.

The packing interposed between the insulator and the center conductor is apt to be deteriorated or deteriorated by the influence of weather or the like, and it is difficult to maintain the airtightness in the equipment case. Is not preferable. Since the packing P2 is housed inside the insulator 1, the connection structure K1 can be prevented from being deteriorated or deteriorated by the influence of weather or the like. Therefore, the airtightness in the device case 50 can be maintained for a long time.

In this embodiment, the projection 320 serving as an engagement portion
... and the concave portions 321 ... and the concave portions 120 ... and the convex portions 121 ... are formed so as to be alternately continuous in the axial circumferential direction. However, the present invention is not limited to this. A flat portion having a required width may be provided between the concave portion and the convex portion. Further, the concave portion and the convex portion may be discontinuous. Further, the depth of the concave portion and the height of the convex portion may be made non-uniform.

FIG. 4 shows a second embodiment of a connection structure for a lead portion according to the present invention, and is an explanatory view in which a part other than a part of a center conductor is attached to a switch and is cross-sectionally shown. In FIG. 4, the same or equivalent parts as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. Further, in the following description, the description of the structure that overlaps with the part described above will be omitted. The symbol K2 indicates a connection structure of the outlet. The connection structure K2 includes an insulator 1 formed of an insulator, a center conductor 3a having a terminal plate 33a on one end side, and a terminal fitting 4 connected to a device (not shown) in the switch. . In FIG. 4, the electric wires connected to the terminal plate 33a of the central conductor 3a are not shown.

The center conductor 3a is arranged so that the terminal plate 33a provided at one end is disposed outside the insulator 1 when the contact portion 32 is engaged with the stop step portion 12 of the insulator 1. It is formed slightly longer than the center conductor 3. The terminal plate 33a is formed in a plate shape, and has attachment holes 330a, 330a for attaching a core wire of an electric wire penetrating at two places. The core of the electric wire is connected to the terminal plate 33a (not shown). The terminal plate 33a and the core of the electric wire are:
The insulator 1 is covered with an insulating cover from the end of the electric wire to the outside of the insulator 1 including the terminal plate 33a and is insulated from the outside (not shown). The operation and effect of the connection structure K2 are substantially the same as those of the connection structure K1 described above, and thus description thereof is omitted.

The terms and expressions used in the specification are merely illustrative and not restrictive. Terms and expressions equivalent to the features described in the specification and some of them are not limited to the terms and expressions. There is no intention to exclude expression. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

[0044]

The present invention has the above configuration and has the following effects. (A) In the connecting structure and the connecting method of the lead portion according to the present invention, the terminal fitting and the central conductor are fastened by engaging the engaging portion of the insulator and the engaging portion of the central conductor with each other. Alternatively, the center conductor is prevented from moving in the axial direction. Thus, when the center conductor and the terminal fitting are tightened, the surface of the insulator and the center conductor that comes into contact with each other does not slip, and the two do not rotate together. In addition, when the electric wire vibrates due to rain or wind, the connection between the center conductor and the terminal fitting does not loosen. ADVANTAGE OF THE INVENTION According to the connection structure and the connection method of the outlet part which concerns on this invention, even if it does not fill a conductor introduction hole with resin like the prior art, it can fix an electric wire and cannot move. Since there is no need to fill the resin, there is no need to form a friction portion on the inner surface of the conductor introduction hole or to cure the filled resin in an electric furnace or the like.
Also, no curing time is required for the resin. Therefore, according to the connection structure and the connection method of the lead portion according to the present invention, manufacture is simple. Furthermore, since this manufacturing can be performed in a short time, productivity is good.

(B) The center conductor can be removed from the insulator by loosening the fastening of the terminal fittings and releasing the connection with the center conductor. At this time, the work of loosening the terminal fitting is performed by engaging the engaging portion of the insulator and the engaging portion of the center conductor with each other. It can be easily done because it does not turn around. That is, according to the connection structure and the connection method of the lead portion according to the present invention, the assembly can be arbitrarily disassembled even after the assembly, and the insulator can be reused.

(C) The engaging portion has a concave portion and a convex portion provided in the circumferential direction of the shaft, and the boundary portion between the concave portion and the convex portion is formed by a curved surface. Even when the engaging portion and the engaging portion of the insulator are not completely engaged, the curved surfaces of the engaging portion guide each other by the tightening of the terminal fittings, and the central conductor rotates while sliding in the axial circumferential direction. Become like Therefore, the engagement portions can be completely engaged with each other naturally. In other words, there is no need to previously engage the engaging portion of the center conductor with the engaging portion of the insulator, so that the assembling work is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a connection structure of an outlet portion according to the present invention, which is attached to a switch and shows a section other than an electric wire,

FIG. 2 is a perspective explanatory view showing a center conductor used in the connection structure of FIG. 1;

FIG. 3 is a perspective explanatory view showing an insulator used in the connection structure of FIG. 1;

FIG. 4 is an explanatory view showing a second embodiment of the outlet-portion connection structure according to the present invention, which is attached to a switch and shows a cross section of a portion other than a part of a center conductor.

FIG. 5 is an explanatory view showing a conventional connection structure of an outlet section, in a state where a section other than an electric wire is sectioned.

[Explanation of symbols]

 K1, K2 Outlet connection structure P1 packing P2 packing P3 packing 1 insulator 10 conductor introduction hole 11 metal fitting attachment hole 12 stop step 120 recess 121 protrusion 13 end face 2 electric wire 20 core wire 3, 3a center conductor 30 crimping part 31 female screw part 32 contact part 33a terminal plate 330a mounting hole 320 convex part 321 concave part 4 terminal fitting 40 male screw part 41 flange part 410 hook hole 42 terminal part 50 equipment case 6 insulator 60 conductor introduction hole 600 friction part 61 Fitting hole 62 Stop step 7 Electric wire 8 Center conductor 80 Contact part 9 Terminal fitting J Resin

Claims (8)

[Claims] An insulator (1) which penetrates an equipment case (50) and in which a conductor disposed therein is insulated from the equipment case (50), wherein a through hole is formed in an axial direction. The stop step (12) formed at a required position in the through-hole cooperates with the engaging portion of the center conductor (3, 3a) to be attached to the stop step (12). , 3a) is provided with an engagement portion for preventing rotation in the circumferential direction of the shaft. 2. An insulator (1) which penetrates an equipment case (50) and is provided such that a conductor disposed therein is insulated from the equipment case (50). Conductor introduction hole (10) and small-diameter mounting hole
A stop step (12) formed at the boundary between the conductor introduction hole (10) and the metal fitting attachment hole (11) has a center to be attached. An insulator provided in cooperation with an engaging portion of the conductor (3, 3a) to prevent the center conductor (3, 3a) from rotating in the axial direction. . 3. An engaging portion is provided in a concave portion (1) provided in a shaft circumferential direction.
20) and a convex portion (121), and the concave portion (120) and the convex portion
The insulator according to claim 1 or 2, wherein the boundary of (121) is formed by a curved surface. 4. A center conductor (3, 3a) having a conductor connected to one end thereof and a terminal fitting (4) connected to the other end while being disposed inside the insulator (1). (1) has a contact portion (32) that can contact the stop step portion (12), and the contact portion (32) cooperates with the engaging portion of the insulator (1). A center conductor provided with an engagement portion for preventing the center conductor (3, 3a) from rotating in the axial direction. 5. The engaging portion is provided with a concave portion (3
20) and a convex portion (321), and the concave portion (320) and the convex portion
The center conductor according to claim 4, wherein the boundary of (321) is formed with a curved surface. 6. The central conductor according to claim 4, wherein the insulator according to claim 1 or 2 is connected to a conductor at one end.
(3, 3a) and the other end of the center conductor (3, 3a), the center conductor
In cooperation with (3, 3a), terminal fittings for fastening the center conductor (3, 3a) to the insulator (1) by tightening the gap between the stop step (12) and the required position of the insulator (1). 4), wherein the terminal fitting (4) and the center conductor (3, 3a) are
The engaging portion of (1) and the engaging portion of the center conductor (3, 3a) are engaged with each other and tightened so as to be airtight or substantially airtight, and the insulator (1) or the center conductor (3,3a) is not moved in the axial direction, the connection structure of the lead portion. 7. The center conductor according to claim 5, wherein a conductor is connected to one end of the insulator according to claim 3.
(3, 3a) and the other end of the center conductor (3, 3a).
In cooperation with (3, 3a), terminal fittings for fixing the center conductor (3, 3a) to the insulator (1) by tightening the insulator (1) from both ends of the fitting mounting hole (11). 4), wherein the terminal fitting (4) and the center conductor (3, 3a) are
The concave part (120) of (1) and the convex part (321) of the central conductor (3, 3a) or the convex part (121) of the insulator (1) and the concave part (320) of the central conductor (3, 3a) The insulator (1) or the center conductor (3, 3a) is fitted so as to be airtight or substantially airtight and is fixed so as not to move in the circumferential direction of the shaft. The connection structure of the outlet. 8. A central conductor is inserted from one of the through holes into the through hole of the insulator having a through hole formed in an axial direction and having a stop step at a required position in the through hole. A terminal fitting is inserted from the other of the through-holes, the terminal fitting is connected to the center conductor, and a gap between a required position of the stop step and the insulator is tightened by the terminal fitting and the center conductor. A method for connecting a lead portion, wherein the center conductor is fixed to the insulator in a state where the provided engaging portion and the engaging portion of the stop step portion are engaged.