JPH07145773A - Noise-wave suppression type distributor and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide an internal combustion engine with a noise wave suppressing type distributor excellent in productivity, low in cost and sufficient for noise wave suppressing effect, and to provide its manufacture. CONSTITUTION:A distributor comprises a distribution element 1 making rotative motion, in which a discharge electrode 4 is exposed without surrounding a discharge face and a high-voltage receiving portion with a high-resistance insulator 9 and plural lateral terminal electrodes 7 opposed to the distribution element with a gap in between. In the manufacture of addictively forming a high resistance insulator 9 in a discharge electrode 4 of the distributor, a discharge electrode 4 formed in specific form is placed in a forming metal mold, with its discharge face and its high-voltage receiving portion being exposed. And then, a high resistance insulator material is poured into the forming metal mold and set. Or otherwise, a discharge electrode 4 is formed in specific form. A high resistance insulator 9 in sheet form, stamped in form of a discharge face and a high voltage receiving portion of a discharge electrode is then disposed in a forming metal mold, so that portions other than the discharge face and the high voltage receiving portion are heat pressure formed integrally so as to surround the high resistance insulator 9, thereby forming a distributor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a device for suppressing noise radio waves generated from an ignition device of an internal combustion engine for automobiles, and more particularly to a discharge electrode for distribution (hereinafter referred to as a discharge electrode). The present invention relates to a noise electric wave suppression type distributor (hereinafter referred to as a distributor) for suppressing a noise electric wave caused by a discharge generated between side terminal electrodes, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Suppressing noise radio waves is intended to prevent noise radio waves caused by spark discharge from interfering with various electronic communications such as automobile electronic control devices, radio broadcasts, television broadcasts, and various wireless communications. It is well known that various kinds of research and development have been carried out and that the number tends to increase in the future.

As shown in FIG. 3, the configuration and the function of the distributor are such that the distributor 1 is mounted on the center shaft 2 and the center carbon piece 3 is brought into contact with the discharge electrode 4 of the distributor. The contact pressure is obtained by the spring 5.
The primary high-voltage current is charged through the primary high-voltage wiring 6, the spring 5 and the center carbon piece 3 into the discharge electrode (hereinafter referred to as the discharge electrode) 4 of the electron distribution.

The distribution electron 1 is rotating at a speed synchronized with the crankshaft of the engine, and when the side terminal electrode 7 of the distributor cap and the discharge electrode 4 face each other, the discharge electrode 4 and the side terminal electrode 7 are separated from each other. The air in the gap between and is subjected to a dielectric breakdown to cause spark discharge, and a current flows through the secondary high-voltage wiring 8 to the spark plug of the engine to supply a high voltage. It is well known that the noise radio wave is proportional to the rise of the voltage during the spark discharge, and the smaller the value, the smaller the noise radio wave tends to be.

[0005] As an example of a conventional power distribution device, specifically, the distribution of electrons, more specifically, a certain amount of space is provided between the tip of the discharge electrode and the side terminal electrode of the power distribution cap, and the upper and lower surfaces of the discharge electrode are as shown in FIG. High resistance insulator 9 made of thin mica plate, ceramic plate, heat-resistant synthetic resin plate, etc. with a thickness of 0.3-0.6 mm 9
Is formed and added to form the electron distribution 1, and the high resistance insulator 9
The discharge voltage and the discharge current are reduced by causing a partial discharge between the discharge electrode 4 and the discharge electrode 4, and the electric field strength of the noise radio wave due to the spark discharge is reduced to suppress the noise radio wave.

[0006]

However, in the conventional electron distribution, the high resistance insulator 9 is formed and attached on both surfaces of the discharge electrode 4 by using an adhesive agent. Due to variations, the quality is unstable and the discharge electrode 4 and the high resistance insulator 9 are easily separated, a step is formed on the discharge surface between the discharge electrode 4 and the high resistance insulator 9, and the discharge electrode 4 and the high resistance insulator 9 are formed. There is a gap between the discharge electrode 4 and
There is a problem that the partial discharge between the high resistance insulator 9 and the high resistance insulator 9 is not sufficiently performed and a sufficient noise radio wave suppressing effect cannot be obtained.

In order to increase the adhesive strength between the discharge electrode 4 and the high resistance insulator 9, the surface of the discharge electrode 4 (the high resistance insulator 9
Since it is necessary to roughen the (bonding surface with), it is not possible to use the metal material of the general market product as it is, and the surface of the metal plate is roughened, or the roughened product is specially ordered. Therefore, it becomes expensive and the management of the adhesive surface and the adhesive strength are required, and the productivity is poor. Therefore, it is required to improve the productivity.
There is a problem in terms of productivity as parts for automobiles that must be manufactured in large quantities and at low cost.

In addition to the above, there is also a method of stacking a number of high resistance insulators on the upper surface of the discharge electrode and crimping them with a rivet. In this method as well, a hole for passing a rivet is formed between the discharge electrode and the high resistance insulator. There are problems such as formation and a gap between the discharge electrode and the high resistance insulator.

Further, there is a method of baking a high resistance insulating varnish or applying a high resistance insulating grease on the surface of the discharge electrode. In the method of baking the high resistance insulating varnish, the high resistance insulating varnish flows and adheres to the discharge surface. In order to do this, it must be removed, which is troublesome. If the removal is insufficient, the discharge voltage will fluctuate and a sufficient noise radio wave suppression effect will not be obtained,
Further, it is extremely difficult to make the applied size constant.
On the other hand, with the method of applying high-resistance insulating grease, not only is it extremely difficult to remove the high-resistance insulating grease flowing and adhering to the discharge surface, but the centrifugal force and discharge energy generated by the rotation of the distribution There is a problem that it is scattered and the life is short.

As described above, in any of the methods, there is currently no distributor which has a sufficient effect of suppressing noise radio waves, is excellent in productivity, and is inexpensive. The present invention eliminates such conventional drawbacks, and provides a distributor having excellent productivity, low cost, and sufficient noise radio wave suppressing effect, and a manufacturing method thereof.

[0011]

DISCLOSURE OF THE INVENTION The present invention interlocks with the rotation of a noise electric wave suppression type distributor and an internal combustion engine in which a discharge surface of a discharge electrode and a portion for receiving a high voltage are exposed without being covered with a high resistance insulator. Distributor having a distribution electron which makes a rotational motion and a plurality of side terminal electrodes provided opposite to the distribution electron via a gap, and in which a high resistance insulator is added to the discharge electrode. In the method for producing, a discharge electrode formed in a predetermined shape is loaded into a molding die so that a discharge surface and a portion receiving a high voltage are exposed, and then a high resistance insulator material is applied to the molding die. Manufacture of a distributor by injecting and curing the high resistance insulator material to integrate the discharge electrode and the portion other than the portion receiving the high voltage with the high resistance insulator so as to form an electron distribution. Method and rotational movement of the internal combustion engine A method of manufacturing a distributor having a distribution electron and a plurality of side terminal electrodes provided opposite to each other with a gap between the distribution electron and forming a high resistance insulator on a discharge electrode. , A discharge electrode is formed in a predetermined shape, and then a sheet-shaped high-resistance insulator punched into the shape of the discharge surface of the discharge electrode and the portion receiving high voltage is arranged at a predetermined position of the discharge electrode. After setting in a mold, heat and pressure molding is performed so that the discharge surface of the discharge electrode and parts other than the part receiving high voltage are integrated so as to be wrapped with a high resistance insulator, and then a distribution device is formed. Regarding

In the present invention, as the discharge electrode, a conductive metal plate of stainless steel, brass, aluminum, iron or the like, a plate in which carbon fibers are bonded with a silicone resin, a phenol resin, a diallyl phthalate resin, a polyester resin, an epoxy resin, or the like. Etc., but metal plates such as stainless steel, brass, aluminum, and iron are preferable because they are easily available and cheap.

As the high resistance insulator, the resin content is 10 to 9
It is preferable to contain 0% by weight and at least one of filler and fibrous substance. Among them, it is preferable to use a heat-resistant thermosetting resin such as silicone resin, phenol resin, diallyl phthalate resin, polyester resin, or epoxy resin as the resin. As a filler,
Silica-based, mica-based, glass-based and other commonly known fillers are used, and as the fibrous substance, glass fiber, asbestos fiber, ceramic fiber, etc. are used. The composition of the high-resistance insulator is appropriately selected and used in combination as needed, but it is preferable to use a silicone resin as the resin, silica-based powder as the filler, and glass fiber as the fibrous substance. .

A part (distributor electrode) in which the discharge surface of the discharge electrode and a part other than the part for receiving a high voltage are integrated so as to be wrapped with a high resistance insulator is further embedded in a molding material to form an electron distribution. . The method of embedding the distribution electrode in the molding material is the injection molding method in which a molten or powdered high-resistance insulator material is injected into the molding die for molding, and a sheet-shaped high-resistance insulator material is used for heating. Methods such as compression molding for pressure molding and compression molding for heat and pressure molding using a powdery high-resistance insulator material can be applied. Among them, the method of molding by injection molding is inexpensive and It is preferable because it can be produced efficiently, and it is more preferable to perform the molding by the two-color type different material injection molding method because the steps up to the formation of the distribution can be continuously performed. Also, the molding conditions and the like are performed by a conventionally known method, and there is no particular limitation.

It is necessary to prevent the high-resistance insulator material from adhering to the portion of the discharge electrode that is in contact with the discharge surface and the center carbon piece and receives a high voltage. To prevent the high-resistance insulator material from flowing in.

The molding die is engraved with a required shape for forming a high resistance insulator on the upper and lower surfaces of the discharge portion of the discharge electrode. By filling the engraved portion with a high-resistance insulator material, the discharge surface of the discharge electrode and the portion other than the portion receiving the high voltage can be integrated so as to be wrapped with the high-resistance insulator.

When integrated, in order to prevent the high resistance insulator from peeling off from the discharge electrode, the discharge electrode may be provided with a hole at a position which does not interfere with the discharge function or the contact function with the center carbon piece, or It is preferable to provide a peeling prevention function such as providing a notch on the outer periphery. This peeling prevention function can use a general plastic molded article retaining prevention function, does not require a special function, and it is preferable that the number is two or more because the peeling prevention is more effective.

The formation of the electron distribution is carried out by a conventionally known method, and there is no particular limitation, and the material used is also not limited, and a conventionally known material can be used.

[0019]

EXAMPLES Examples of the present invention will be described below. Example 1 A stainless steel plate (JIS G4305 SUS304) having a thickness of 0.6 mm, which was not roughened, was punched into a predetermined shape and size by a punching press, and two high-resistance insulator drop-out preventing holes were punched out. Then, it was degreased by washing with a dilute hydrochloric acid solution.

Next, the above punched stainless steel plate was
Set the discharge surface and the part that contacts the center carbon piece and receive high voltage to the product shape so that it is exposed, and set in the molding die, and while maintaining the die surface temperature at 200 ° C, glass fiber 50% by weight and silicone resin 50
A silicone resin molding material (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KMC-401) mixed with weight% (solid content) is injection-molded into the above-mentioned molding die by a known method, and after the silicone resin molding material is cured, the molding die is cured. The mold was opened, and as shown in FIG. 1, a distribution electrode was obtained in which a part of the discharge electrode 4 was wrapped with a high resistance insulator 9 to be integrated. In addition, in FIG. 1, reference numeral 10 is a drop-out preventing hole. The presence or absence of a gap between the discharge electrode 4 and the high resistance insulator 9 was observed for the obtained distribution electrode using a magnifying glass having a magnification of 20 times, but no gap was observed.

Then, the portion for receiving a high voltage of the distribution electrode (the exposed surface of the punched stainless steel plate) is set on the distribution molding die, and the polypropylene containing 40% by weight of talc is prepared by a conventionally known injection molding method. A distribution electrode was embedded in a resin molding material (Hyform M40BF manufactured by Hitachi Chemical Mold Co., Ltd.) to obtain a distribution. The distribution thus obtained is assembled by a conventionally known method to form a distributor (the same applies hereinafter).

Example 2 Instead of the silicone resin molding material used in Example 1, 30% by weight of phenol resin (solid content), 40% by weight of glass fiber and other calcium silicate, asbestos, hexamethylenetetramine, organic base material A part of the discharge electrode was prepared in the same manner as in Example 1 except that a phenolic resin molding material containing 30% by weight of a plurality of fillers containing the same (Hitachi Chemical Co., Ltd., trade name CP-J-771BK) was used. An integrated distribution electrode was obtained so as to be wrapped with a high resistance insulator. The presence or absence of a gap between the discharge electrode and the high resistance insulator of the obtained distribution electrode was observed using a magnifying glass having a magnification of 20 times, but no gap was observed. Then, the electron distribution was obtained through the same steps as in Example 1.

Example 3 A stainless steel plate similar to that of Example 1 was punched into a predetermined shape and size, and two dropout prevention holes of a high resistance insulator were punched out to form a sander on both surfaces for increasing adhesion. After being roughened with, a silane coupling agent (manufactured by Nippon Unicar, trade name A-174) whose viscosity was adjusted with methanol was applied and dried.

On the other hand, a silicone resin (manufactured by Toshiba Chemical Co., Ltd., trade name YR-3224H) obtained by adding dichlumiperoxide as a catalyst to a plain woven glass fiber cloth having a thickness of 0.18 mm (trade name AS-350 manufactured by Asahi Shovel Co.). ), And the solvent was volatilized by a conventionally known method to obtain a silicone resin-impregnated coated cloth having a silicone resin adhesion of 28% by weight. After that, the silicone resin-impregnated coated cloth was die-cut with a mold in the shape of the discharge surface of the discharge electrode and the portion receiving high voltage, and the other portions were punched out into a predetermined shape and dimension to obtain a sheet-like high resistance insulator.

Next, a sheet-shaped high-resistance insulator is arranged at a predetermined position of a punched product (discharge electrode) of a stainless steel plate and set in a molding die, and 220 is formed by a known compression molding method.
A pressure distribution of 9.8 × 10 ⁶ Pa (100 kg / cm ² ) was applied at 35 ° C. for 35 minutes to form a distribution electrode integrated by encapsulating a part of the discharge electrode with a high resistance insulator by heating and pressurizing. It was The presence or absence of a gap between the discharge electrode and the high resistance insulator of the obtained distribution electrode was observed using a magnifying glass having a magnification of 20 times, but no gap was observed. Then, the electron distribution was obtained through the same steps as in Example 1.

Example 4 Instead of the silicone resin molding material used in Example 1, 40% by weight of a plurality of fillers containing 50% by weight of phenol resin, 10% by weight of glass fiber and other calcium silicate, organic base material and the like. %, And a phenol resin molding material (Hitachi Chemical Co., Ltd., trade name CP-J-8800BK) was used to obtain a distribution electrode in the same manner as in Example 1. The presence or absence of a gap between the discharge electrode and the high resistance insulator of the obtained distribution electrode was observed using a magnifying glass having a magnification of 20 times, but no gap was observed. Then, the same steps as in Example 1 were performed to obtain an electronic distribution in which a part of the discharge electrode was integrated with a high resistance insulator.

Example 5 A two-color injection molding machine was used as a molding machine. One injection cylinder was used for a thermosetting resin and the other injection cylinder was used for a thermoplastic resin. Attached a molding die to obtain a distribution electrode by integrating the discharge electrode with a high-resistance insulator, and a molding die to obtain a distribution electron on the thermoplastic resin cylinder side. Further, a molding die for obtaining a distribution electrode (hereinafter referred to as a distribution electrode molding die) is manufactured by obtaining a distribution electrode and then holding the distribution electrode on one side of the molding die while holding the other distribution electrode. Repeat the process of moving to a molding die for obtaining electrons (hereinafter referred to as the distribution molding die) to mold the distribution and obtaining the distribution electrode with another pair of molding dies during this period. In addition, the structure is such that the molding dies can be replaced alternately.

First, a thermosetting resin cylinder was used in Example 1.
The silicone resin molding material having a silicone resin content of 50% by weight used in Example 1 was filled and the surface temperature of the distribution electrode molding die was kept at 200 ° C. Then, the punched stainless steel plate used in Example 1 was set in this molding die so that the portion which became the discharge surface and the portion which received electricity were exposed, and injection molding was carried out by a known method to cure the silicone resin molding material. Thus, a distribution electrode was obtained in which a part of the discharge electrode was wrapped with a high resistance insulator to be integrated.

Next, the distribution electrode molding die is opened, and while the distribution electrode is held in one of the distribution electrode molding dies (upper mold), it is rotated toward the thermoplastic resin cylinder side and fixed. The distribution mold was moved to the existing distribution mold (lower mold), and the moved distribution electrode mold and the fixed distribution mold were combined to form a new distribution mold. The temperature of the moved distribution electrode molding die and the fixed distribution molding die was adjusted to 80 ° C. Then, a polypropylene resin molding material containing 40% by weight of talc used in Example 1 was injection-molded from a thermoplastic resin cylinder into a distribution molding die by a known method, cooled and solidified, and then the molding die was opened and taken out. Got electronic distribution. The distribution electrode in the exposed portion of the distribution was observed for the presence of a gap between the radiation electrode and the high resistance insulator by using a magnifying glass having a magnification of 20. However, no gap was observed.

Embodiment 6 Two holes for engaging with a portion supporting the distribution electrode (hereinafter referred to as a distribution main body) are formed at positions not interfering with the discharge surface of the distribution electrode and the portion receiving high voltage. Except for the formation, the same steps as in Example 1 were carried out to obtain a distribution electrode in which a part of the discharge electrode was integrated so as to be wrapped with a high resistance insulator. The presence or absence of a gap between the discharge electrode and the high resistance insulator was observed for the obtained distribution electrode using a magnifying glass with a magnification of 20 times, but no gap was observed.

On the other hand, in addition to the above, a columnar body engaging with two holes formed in the distribution electrode by molding the polypropylene resin molding material containing 40% by weight of talc used in Example 1 by a known injection molding method. The electronic distribution main body provided with was obtained. The height of the columnar body was higher than the height (thickness) of the distribution electrode.
Then, the two holes formed in the distribution electrode were pushed into the columnar body of the distribution body, and the columnar body protruding from the surface of the distribution electrode was softened by heat and crushed to fix the distribution electrode to the distribution body.

Comparative Example 1 A stainless steel sheet similar to that used in Example 1 was roughened on one side with a sander, washed, degreased, and then roughened. A silane coupling agent (manufactured by Nippon Unicar, trade name) A
-174) whose viscosity was adjusted with methanol was applied and dried.

Next, three pieces of the silicone resin-impregnated coated cloth used in Example 3 and having a silicone resin adhesion amount of 28% by weight were provided on the side of the stainless steel plate to which surface roughening, degreasing treatment and silane coupling agent were applied. The laminate was laminated, heated and pressed by a known method to form and add the high resistance insulator A to the stainless steel plate, and then punched into a predetermined shape and dimension with a mold to obtain a laminated plate having a two-layer structure.

On the other hand, in addition to the above, three sheets of the above silicone resin-impregnated coated cloth are laminated and integrated by heating and pressurizing by a known method, and then the portion where the center carbon piece comes into contact is punched out with a mold to obtain a high resistance insulator. B was obtained. Then, the high-resistance insulator B was attached to the stainless steel plate side of the laminated plate having a two-layer structure, and a silicone adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KR-10).
Both were adhered using 5) to obtain a distribution electrode. The bonding was performed in a room at room temperature and humidity. When the presence or absence of a gap between the stainless steel plate and the high resistance insulators A and B was observed for the obtained distribution electrode using a magnifying glass with a magnification of 20 times, the depth was 0.2 mm and the width was 0.1 mm. It was confirmed that a gap was generated almost all around, and the stainless steel plate and high resistance insulator A
It was confirmed that there was a step difference of 0.1 mm between B and B and that the high resistance insulators A and B were projected from the stainless steel plate.

Comparative Example 2 A stainless steel plate having a thickness of 1.0 mm (JIS Q4305
SUS304) was punched into a predetermined shape and dimensions by a punching press, and then set in a distribution molding die without forming a high-resistance insulator, and 40% by weight of talc used in Example 1 was used by a conventionally known injection molding method. An electronic distribution embedded in a polypropylene resin molding material was obtained.

Next, the discharge voltage of the electron distribution obtained in each example and each comparative example was measured. In addition, the measurement uses an aluminum alloy rod 5052 of JIS H 4040 for the side electrode facing the discharge power of the electron distribution, the gap between the discharge electrode and the side terminal electrode is 1.0 mm, and the ignition coil voltage is set to the distribution electrode. The discharge electrode was charged. The measurement results are shown in Table 1.

[0037]

[Table 1]

As shown in Table 1, the discharge voltage of the distribution according to the embodiment of the present invention is equal to or lower than the discharge voltage of the conventionally known distribution of Comparative Example 1, and the discharge voltage of Comparative Example 2 is smaller. It can be seen that the discharge voltage is remarkably smaller than the conventionally known discharge voltage of distribution. In particular, the electron distributions of Examples 1, 5 and 6 are about 30% lower than that of the discharge electrode of the conventionally known electron distribution of Comparative Example 1, which shows that an excellent noise radio wave suppressing effect is exhibited. .

In the embodiment, the discharge electrode is formed by punching out two holes for preventing the high resistance insulator from falling off. However, as shown in FIG. 2, a notch 1 is formed on the outer circumference of the discharge electrode.
The same effects as those of the embodiment can be obtained with the device provided with 1.

[0040]

According to the present invention, the distribution electrode can be manufactured by applying a known molding method, and moreover, the discharge electrode and the high resistance insulator are in intimate contact with each other and are integrated with each other. The electric appliance has a noise electric wave suppression effect equal to or higher than that of a conventionally known electric distributor. Further, since the electronic distribution can be manufactured by a known molding method using a known molding material, it is possible to manufacture a power distributor having excellent productivity, low cost, efficiency, and mass productivity.

[Brief description of drawings]

FIG. 1 is a plan view of a distribution electrode used in a distributor according to an embodiment of the present invention.

FIG. 2 is a plan view of a distribution electrode used in a distributor according to another embodiment of the present invention.

FIG. 3 is a partial cross-sectional side view showing the structure of the distributor.

FIG. 4 is a partial cross-sectional side view showing a conventional electron distribution.

[Explanation of symbols]

 1 Electronic Distribution 2 Center Shaft 3 Center Carbon Piece 4 Discharge Electrode 5 Spring 6 Primary High Voltage Wiring 7 Side Terminal Electrode 8 Secondary High Voltage Wiring 9 High Resistance Insulator 10 Fall Prevention Hole 11 Notch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Sato 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Nititsu Kasei Mold Co., Ltd.

Claims (4)

[Claims] 1. A noise electric wave suppression type power distributor in which a discharge surface of a discharge electrode of a distribution electron (hereinafter referred to as a discharge electrode) and a portion for receiving a high voltage are exposed without being wrapped with a high resistance insulator. 2. A discharge having a distribution of electrons that makes a rotary motion in conjunction with rotation of an internal combustion engine and a plurality of side terminal electrodes provided opposite to the distribution of electrons through a gap, and having a discharge. In a method of manufacturing a noise electric wave suppression type distributor in which a high resistance insulator is added to an electrode, a discharge electrode having a predetermined shape is formed in a molding die by exposing a discharge surface and a portion receiving a high voltage. Then, a high-resistance insulator material is injected into the molding die, and the high-resistance insulator material is cured so that the discharge surface of the discharge electrode and the portion other than the portion receiving the high voltage are made of the high-resistance insulator. A method of manufacturing a noise electric wave suppression type distributor, which comprises forming an electric distribution after wrapping and integrating. 3. A discharge having a distribution of electrons that makes a rotary motion in association with rotation of an internal combustion engine, and a plurality of side terminal electrodes provided opposite to the distribution of electrons through a gap, and discharging. In a method of manufacturing a noise electric wave suppression type distributor in which a high resistance insulator is added to an electrode, a discharge electrode is formed in a predetermined shape, and then a discharge surface of the discharge electrode and a high voltage are received at a predetermined position of the discharge electrode. After arranging a sheet-shaped high resistance insulator punched out in the shape of the part and setting it in the molding die, heat and pressure molding is performed to make the discharge surface of the discharge electrode and parts other than the part receiving high voltage high resistance A method of manufacturing a noise electric wave suppression type distributor, comprising forming an electric distribution after being integrated so as to be wrapped with an insulator. 4. The noise electric wave suppression type distributor according to claim 2, wherein the high resistance insulator contains 10 to 90% by weight of a resin component and one or more of a filler and a fibrous substance. Manufacturing method.