Spark plug

A technology of spark plug and center electrode, applied in the field of spark plug and its manufacturing, can solve the problems of high glaze firing temperature, easy flashover of spark plug, reduced insulation performance, etc.

Inactive Publication Date: 2007-02-14
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Although the glaze contains a large amount of PbO, the firing temperature of the glaze is still high, 1000°C or higher
However, if the alkali metal content increases too much, the insulation performance will be reduced, and the spark plug will be prone to flashover

Method used

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Examples

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Embodiment 1

[0129] figure 1 and Fig. 2 shows an example of the spark plug according to the first mode of the present invention. The spark plug 100 includes: a cylindrical metal shell 1 , an insulator 2 , a center electrode 3 and a ground electrode 4 . The insulator 2 and the metal case 1 are fitted such that the tip of the insulator 2 protrudes from the metal case 1 . The center electrode 3 is disposed inside the insulator 2 such that the spark discharge portion 31 formed at the tip of the center electrode 3 protrudes from the insulator 2 . One end of the ground electrode 4 is connected to the metal shell 1 by welding or the like, while the other end thereof is bent to face the tip of the center electrode 3 . A spark discharge portion 32 facing the spark discharge portion 31 is formed on the ground electrode 4 . A spark discharge gap is formed between the spark discharge portions 31 and 32 facing each other.

[0130] A metal shell made of a metal like carbon steel forms a cylindrical...

Embodiment 2

[0177] An embodiment of the spark plug according to the second mode of the present invention will be described below. Except for the composition of the glaze layer, the structure of the spark plug of Example 2 is exactly the same as that of Example 1. Therefore, detailed descriptions other than the glaze layer are omitted, and they can be obtained by Figures 1 to 7 See very clearly. The glaze material for forming the glaze layer 2d includes: Si, B, Zn and Ba, which are main cationic components; at least one of Ti and Zr; and at least one of alkali metal components Na, K, Li. The content of the main cationic components is as follows: the weight percentage of Si is 20-40%, according to SiO 2 In conversion, the weight percentage content of B is 20-35%, according to B 2 o 3 In conversion, the weight percentage of Zn is 15-25%, converted by Zn, and the content of Ba is 10-23%, converted by BaO. The total amount of Ti and Zr is 2-10%, as TiO 2 and ZrO 2 convert. The total w...

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Abstract

A glaze layer formed on the surface an alumina-based insulator of a resistor spark plug contains SiO2 (18 to 35% by weight), B2O3 (25 to 40% by weight), ZnO (10 to 25% by weight), BaO (7 to 20% by weight), Na2O (3 to 9% by weight), and K2O (3 to 9% by weight). Since the difference between the coefficients of linear expansion of the glaze and that of the alumina-based insulating material is relatively small, the glaze layer is less susceptible to cracks and the like. Also, since the glaze has a softening point lower than that of conventional lead-silicate-glass-based glaze, the glost-firing temperature can be as low as 800 DEG to 950 DEG C. Therefore, even in the case where glost firing is performed concurrently with a glass sealing step, a center electrode and a terminal metal piece are less susceptible to oxidation. Further, even though the content of the alkali metal component is high, a good insulating performance is obtained so that excellent flashover resistance is attained.

Description

[0001] This application is a divisional application of No. 99107007.0 patent application for invention. technical field [0002] The present invention relates to a spark plug and a method of manufacturing the same. Background technique [0003] A spark plug for igniting an internal combustion engine, such as an automobile engine, generally includes a metal shell; an insulator, such as made of alumina-based ceramic, placed within the metal shell; and a center electrode within the metal shell. A ground electrode is connected to the metal shell. An insulator protrudes axially from the rear opening of the metal case. A terminal metal piece is located inside the protrusion of the insulator. The terminal metal piece is connected to the central electrode through a resistor, a conductive glass seal formed in the glass sealing step, and the like. Once a high voltage is applied through the terminal metal plate, a spark discharge will be induced in the gap formed between the ground ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/00H01T13/20H01T13/38H01T13/39H01T13/52C04B35/10H01T21/02
Inventor 杉本诚增田浩盟
Owner NGK SPARK PLUG CO LTD
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