JPH06283251A - Conductive seal material for spark plug and combining method of spark plug insulator by seal material thereof - Google Patents

Abstract

PURPOSE:To provide a conductive seal material for a spark plug wherein the conductive seal material is easy to be inserted in a proper amount and does not pollute an insulator and to provide a setting method of a spark plug insulating material by the seal material. CONSTITUTION:Powder particles 11 of conductive glass are pressed to give a conductive seal material. The seal material may be a material consisting of two conductive seal materials 1, 1 and a monolithic resister set between the seal materials 1, 1 wherein the resistor is prepared by solidifying powder particles of glass-containing resistor by pressure. In this case the conductive glass powder particles 11 or the resistor powder particles have 50mum or bigger and 700mum or smaller average particle size and are solidified by pressing at 2400kg/cm<2>-4800kg/cm<2> pressure. The method to set a spark plug insulator by the seal material involves the following: the conductive seal material is inserted in a through axial hole of an insulator to be set between a center electrode and a terminal electrode which are inserted from both ends of the axial hole, and while the terminal electrode being pressured, the seal material is melted by heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive seal material for a spark plug for sealing a through shaft hole of an insulator of the spark plug and a method for assembling the spark plug insulator with the seal material.

[0002]

2. Description of the Related Art A center electrode is inserted into a leg long side and a terminal electrode is inserted into a head side of a through shaft hole provided in an insulator of a spark plug. The middle portion of the shaft hole is sealed by a conductive glass material that seals the shaft hole and electrically connects the center electrode and the terminal electrode. In addition, a spark plug in which an electric resistor is interposed in the middle portion of this conductive glass to prevent radio noise is also manufactured.

Conventionally, the sealing material made of conductive glass has been disclosed in Japanese Patent Publication No. 56-19073 and Japanese Patent Laid-Open No. 60-15.
No. 0601 and Japanese Patent Application Laid-Open No. 60-150602, and a powder or paste-like sealing material made of a conductive glass or a glass-containing resistor in powder or paste is used as the insulator axial hole. It was made by filling in, heating and melting and fixing.

[0004]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
It had the following drawbacks: B) Since the material of the conductive glass or the glass-containing resistor is powder or paste, it is difficult to control the proper amount to keep the input amount, and it takes time to put it in the shaft hole of the elongated insulator, which results in production. The sex is bad. (B) Since the material of the conductive glass or the glass-containing resistor has a low density, the volume of the material when it is melted and cooled and solidified is large, and a large volume is required for filling. C) If the sealing material is powder or paste, it may adhere to the surface of the insulator and stain the product.

The object of the present invention is to easily insert (fill) a proper amount of the conductive sealing material into the through-shaft hole of the insulator at a high speed, and to perform the melting quickly, thereby improving the productivity. The present invention also provides a conductive sealing material for a spark plug that can prevent the sealing material from adhering to the surface of the spark plug insulator, and a method for assembling the spark plug insulator with the sealing material.

[0006]

The conductive sealing material for a spark plug according to the present invention is obtained by pressing powder particles of conductive glass into a solid by pressing, and the conductive sealing material between the two spark plug conductive sealing materials is a glass. A monolithic resistor is formed by interposing a powder particle of the contained resistor by pressing. In this case, the average particle diameter of the conductive glass powder particles or the resistor powder particles is 50 μm or more and 700 μm or less.
It is desirable to press and solidify at a pressure of 00 kg / cm ^{2 to} 4800 kg / cm ² .

According to a fourth aspect of the present invention, there is provided a method for assembling a spark plug insulator using a seal material, wherein a spark plug conductive seal material is inserted into a through shaft hole of an insulator and inserted from both ends of the shaft hole. It is characterized in that it is arranged between the center electrode and the terminal electrode and is heated and melted while pressing the terminal electrode.

[0008]

According to the present invention, since the conductive glass powder particles or the glass-containing resistor powder particles are pressed into a solid body, a proper amount of the sealing material can be quickly added to the shaft hole of the spark plug insulator. Easy to insert inside. Further, since it is a solid body, it easily melts, and unlike powder, it is possible to reliably prevent the trouble of adhering to the product and soiling the surface of the product.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a manufacturing process of a conductive sealing material 1 of the present invention. The conductive sealing material 1 includes 50% by weight of glass powder, 50% by weight of metal powder such as copper, PEG (polyethylene glycol), PED (polyethylene oxide),
A suitable amount (3 to 10% by weight) of an organic binder such as dextrin and water are added, mixed, granulated, dried (containing about 1% of water), and the conductive glass powder particles 11 are press molded into a solid body. There is. The average particle size of the powder particles 11 is 50
From the viewpoint of molding, solidification, etc., it is desirable that the thickness is at least μ and at most 700 μ.

As shown in (a), a die 13 having a circular hole 12 having a diameter of 4.6 mm is filled with the lower end of the circular hole 12 by an upper end surface of a plunger 14, and the conductivity is measured in the circular hole 12. The powder particles 11 of glass are filled. Next, as shown in (b), lower the pin 15 from above the circular hole 12
The powder particles 11 of the conductive glass are solidified by cold pressing with a load of g to 600 kg to obtain the conductive sealing material 1. After pressing (C), the plunger 14 is raised to take out the solid conductive seal material 1 from the mold 13. Thereby, the conductive sealing material (solid body) 1 shown in (d) can be manufactured.

Further, as shown in FIG. 2, a laminated body 3 containing a resistor can be manufactured. The conductive sealing material 1 is manufactured by the same method as in FIG. Next, carbon powder to glass powder,
Metal powder such as aluminum, magnesium, titanium,
Load life stabilizers such as titanium dioxide and titanium carbide, ceramic aggregates such as silica, alumina and silicon nitride, and the same organic binder using conductive glass sealant 1 and water were added, mixed, granulated and dried. Electric resistance powder particles 22
And The resistor powder particles 22 are replaced with (a), (b) in FIG.
Monolithic resistor 2 shown in (d) after step (c)
To manufacture. After this, as shown in (e), the monolithic resistor 2 is made up of the two conductive seal materials 1 produced previously.
Are joined to both ends to form a laminated body 3. This laminated body 3 is used for a spark plug 8 containing a resistor (shown in FIG. 5) capable of removing noise. In the laminate 3, the conductive glass powder particles 11 and the resistor powder particles 22 are provided in the circular hole 12 of the mold 13.
Further, the powder particles 11 of the conductive glass can be filled and pressed to be integrally manufactured.

3 (a) and 3 (b) show a process of assembling the spark plug to the insulator 4 by the conductive sealing material 1. As shown in FIG. The insulator 4 of the spark plug has a rod-like shape, and has a long leg portion 41 having a small diameter on the front end side (lower side in the drawing), a head portion 42 having a medium diameter on the rear end side and having a corrugation on the outer periphery, and a large diameter collar at the middle. The shaft portion 40 has a body portion 43 having a shape portion.
Are provided so as to penetrate therethrough. The through-shaft hole 40 is formed such that the portion located at the leg long portion 41 has a small diameter.

The center electrode 5 is fixed to the shaft hole 40 with a conductive seal material 1. The center electrode 5 is inserted into the shaft hole 40 at the tip and protrudes from the tip of the long leg portion 41 of the insulator 4. The rear part of the center electrode 5 is composed of a terminal electrode 6 having a plug cap connection terminal 61.

As for assembly, first, as shown in (a), the center electrode 5 is inserted into the shaft hole 40 from above in the drawing and fitted into the leg long portion 41. Next, from the upper side in the drawing, the conductive sealing material 1 is inserted into the portion located in the body portion 43, and the terminal electrode 6 is further inserted into the head portion 42. The conductive sealing material 1 is sandwiched between the center electrode 5 and the terminal electrode 6, and 850 to 95 in a pressurized state.
Heat to around 0 ° C to melt the conductive sealing material 1,
As shown in (b), the shaft hole 40 is sealed, and the center electrode 5 and the terminal electrode 6 are electrically connected and fixed.

FIG. 4 shows a process of assembling the laminated body 3 composed of the monolithic resistors 2 sandwiched by the conductive sealing materials 1 to the spark plug insulator 4. As shown in (a), the center electrode 5 is attached to the long leg portion 41.
Is inserted, the laminated body 3 is inserted in the portion located in the body portion 43, and the terminal electrode 6 is further inserted in the head portion 42. The laminate 3 is melted by heating in the same manner as described above, and the central electrode 5 and the terminal electrode 6 are electrically connected and fixed as shown in (b).

When the conductive sealing material 1 is laminated on both ends of the monolithic resistor 2 in the laminated body 3, the resistor 2 has a poor contact property with the metal center electrode 5 and the terminal electrode 6, resulting in poor contact. This is because it is easy. As shown in FIG. 5, the insulator 4 is assembled to the tubular metal shell 7 to complete the spark plug 8 containing the monolithic resistor 2.

The materials for the conductive glass and the glass-containing resistor of the present invention are not limited to the above-mentioned examples, and known materials such as the above conductive glass to which ceramic aggregate is added can be used. Known materials can be used as the material.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram of a conductive sealing material of the present invention.

FIG. 2 is a manufacturing process diagram of a laminate according to the present invention.

FIG. 3 is an assembly process diagram of a spark plug insulator using the conductive sealing material of the present invention.

FIG. 4 is an assembly process diagram of a spark plug insulator according to the laminated body of the invention.

FIG. 5 is a sectional view of a spark plug incorporating an insulator using the laminated body of the present invention.

[Explanation of symbols]

 1 Conductive Sealing Material 2 Monolithic Resistor 3 Laminated Body 4 Insulator 5 Center Electrode 6 Terminal Electrode 7 Metal Shell 8 Spark Plug 11 Conductive Glass Powder Particles 22 Electrical Resistance Material Powder Particles 40 Through Shaft Hole

Claims (4)

[Claims] 1. A conductive sealing material for a spark plug, which is formed by pressing powder particles of conductive glass into a solid by pressing. 2. A conductive sealing material for a spark plug, wherein a monolithic resistor made by pressing powder particles of a glass-containing resistor into a solid state is interposed between two spark plug conductive sealing members according to claim 1. . 3. The average particle diameter of the conductive glass powder particles or the resistor powder particles according to claim 1 or 2,
0μ or more and 700μ or less, 2400 kg / cm ²
A conductive sealing material for a spark plug, which is pressed and solidified at a pressure of 4800 kg / cm ² . 4. The spark plug conductive sealing material according to claim 1 or 2 is inserted into a through shaft hole of an insulator and is inserted from both ends of the shaft hole to a center electrode and a terminal electrode. And a method of assembling a spark plug insulator with a sealing material, wherein the terminal electrode is heated and melted while being pressed.