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Spark plug manufacturing method, and spark plug

一种制造方法、火花塞的技术，应用在火花塞制造、火花塞、电气元件等方向，能够解决火花塞难以确保耐久性等问题，达到确保耐久性的效果

Inactive Publication Date: 2010-01-20
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the spark plug has a problem that it is difficult to ensure durability

Method used

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  • Spark plug manufacturing method, and spark plug
  • Spark plug manufacturing method, and spark plug
  • Spark plug manufacturing method, and spark plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be described in detail below with reference to the accompanying drawings. Here, the same parts and locations are assigned the same reference numerals to avoid repeated descriptions thereof.

[0027] As shown in 1 , a spark plug 100 according to an embodiment of the present invention includes a metal shell 1 , a ceramic insulator 2 , a center electrode 3 and a ground electrode 4 .

[0028] The metal case 1 is made of metal such as mild steel and formed into a cylindrical shape. A threaded portion 7 is formed on the outer peripheral surface of the metal shell 1 and adapted to mount the spark plug 100 to an engine block (not shown).

[0029] The ceramic insulator 2 is made of sintered ceramics such as alumina or aluminum nitride and is held in the metal case 1 , and the front end portion of the ceramic insulator 2 protrudes from the end surface of the metal case 1 .

[0030] The through hole 6 is formed through the ceramic insulator 2 along the...

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PUM

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Abstract

Provided is a method for manufacturing a spark plug including a cylindrical main metal fitting, a cylindrical insulator held in the main metal fitting, a center electrode held in the insulator and extending in the axial direction, and an earth electrode having a base end portion to be fixed on the main metal fitting and a leading end portion equipped with a protruding portion confronting the leading end portion of the center electrode through a clearance, and made to have a substantially equal thickness other than the portion having the protruding portion. The spark plug manufacturing method is characterized by comprising a pressing step of pressing the entirety of an earth electrode material for forming the earth electrode, thereby to form the protruding portion at the leading end portion of the earth electrode material, and a welding step of welding the base end portion of the earth electrode material to the main metal fitting.

Description

technical field [0001] The present invention relates to a method of manufacturing a spark plug used in an automobile internal combustion engine and the like, and to the spark plug. Background technique [0002] A known spark plug includes a center electrode and a ground electrode arranged with an electrical gap spaced from the front end of the center electrode so that a spark discharge for igniting an air-fuel mixture in a combustion chamber of an internal combustion engine is generated between the center electrode and the ground electrode . [0003] In recent years, among calls for global environmental protection, there has been an increasing demand to provide energy savings, limit carbon dioxide emissions and reduce unburned gas (hydrocarbon) emissions. In order to meet these demands, internal combustion engines, such as lean-burn engines, direct-injection gasoline engines, and low-emission gas engines, have been actively improved. In addition, exhaust gas recirculation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/20H01T21/02
CPCH01T21/02H01T13/32
Inventor 中山胜稔长泽聪史
Owner NGK SPARK PLUG CO LTD