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Spark plug

A spark plug and shaft hole technology, applied in the field of spark plugs, can solve the problems of weak bonding between the resistor body and the sealing layer, the diameter of the resistor body sealing layer becomes thinner, and the load life performance is reduced, so as to achieve improved load life performance, excellent load life performance, The effect of suppressing shaking

Active Publication Date: 2013-06-05
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the pore diameter of the insulator becomes smaller, the diameter of the resistor and the sealing layer also become smaller
Then, the bond between the resistor body and the sealing layer becomes weak, and when a shock or vibration acts on the spark plug, a crack occurs at the interface between the resistor body and the sealing layer, and as a result, the load life performance may be reduced.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0108]

[0109] Made according to the above manufacturing process figure 1 The spark plug shown. In addition, by setting the length in the axial direction of the accommodated portion (the length of the accommodated portion), the inner diameter (diameter of the middle diameter portion) of the shaft hole of the insulator in the front end portion on the center electrode side of the terminal fitting, and the exposure from the above-mentioned third step The length of the axis O direction (exposed length (K)) from the front end of the part to the rear end of the insulator changes, making group B m,y The number and presence of group B m,y The area of ​​the various spark plugs is different.

[0110] A micro X-ray CT device (TOSCANER-32250μhd) is used to take cross-sectional images S of each spark plug at 0.5mm intervals from the rear end of the accommodated part toward the front end to the rear end position where the connecting member exists. n , as mentioned above, based on the ...

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Abstract

A spark plug having excellent load life performance even when the spark plug receives an impact or vibration. The spark plug includes an accommodated portion of a metallic terminal, which is accommodated in an axial hole of an insulator, having a plurality of bent portions formed as a result of proper bending of the accommodated portion. The bent portions are in close vicinity to an inner circumferential surface of the insulator at three or more locations, and are present without localizing in the radial direction of the axial hole.

Description

technical field [0001] The present invention relates to a spark plug used for ignition of an internal combustion engine, and more particularly to a spark plug having a resistor inside. Background technique [0002] A spark plug used for ignition of an internal combustion engine such as a motor vehicle engine generally has: a cylindrical metal fitting; a cylindrical insulator disposed in the inner hole of the main body; a center electrode disposed in the shaft hole on the front end side of the insulator; a terminal fitting having a shaft hole on one end side; and a ground electrode having one end joined to the front end side of the main fitting and the other end opposing the center electrode to form a spark discharge gap. Furthermore, there is also known a spark plug in which a resistor is provided between a center electrode in a shaft hole and a metal terminal for the purpose of preventing generation of radio noise. [0003] The resistor is usually made of a mixture of cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/34H01T13/20
CPCH01T13/34H01T13/20H01T13/02H01T13/05H01T21/02H01T13/41
Inventor 吉田治树本田稔贵铃木彰
Owner NGK SPARK PLUG CO LTD
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