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Spark plug

A technology of spark plugs and ceramic insulators, applied in the field of spark plugs, can solve the problems of broken ceramic insulators, cracks, damaged wire covers, and more expensive pulling out.

Inactive Publication Date: 2009-07-15
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Negative pressure or vacuum is thus created inside the wire shield, so more force is required to pull the wire shield out of the spark plug
If the wire shield is pulled under force, it can result in damage to the wire shield or its breakage or cracks on the ceramic insulator

Method used

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Experimental program
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Effect test

Embodiment Construction

[0034] Referring now to the accompanying drawings, especially figure 1 , which shows a spark plug for an automotive internal combustion engine according to a first embodiment of the present invention.

[0035]The spark plug 1 roughly includes a hollow cylindrical metal shell 2 , a ceramic insulator 3 , a center electrode 4 and a ground electrode 5 . The ceramic insulator 3 is held within the metal case 2 to have an insulator head 31 extending outside the metal case 2 toward the base end side (ie, the upper portion as viewed in the drawing) of the spark plug 1 . The center electrode 4 is held in a center hole 32 formed in the ceramic insulator 3 . The ground electrode 5 extends from the metal casing 2 and faces the center electrode 4 through a spark discharge gap 14 .

[0036] The metal shell 2 has a thread 21 and a hexagon head 22; the thread 21 is used for installation in the internal combustion engine, and a wrench will be fitted on the hexagon head 22 to install or remove...

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Abstract

The invention proposes a spark plug which is designed to be compact without compromising the mechanical strength of the ceramic insulator. The spark plug includes a metal shell having a base end and a top end. The ceramic insulator is made of a hollow cylindrical body including a body and an insulating head. The body is held within the metal housing. The insulating head extends from the base end of the metal shell in the longitudinal direction of the ceramic insulator, and has a length consisting of a main body and an end; the main body leads to the body of the ceramic insulator and the end positioned away from the body of the ceramic insulator. The body has an outer diameter D1, an inner diameter D2, and a section modulus Z at its smallest outer diameter portion, which satisfy the relationships: 7.1mm≤D1≤8.8mm, D2≥2.8mm, and Z≥33mm3.

Description

technical field [0001] The present invention relates generally to improved durability spark plugs for internal combustion engines that may be used in automobiles, combined heat and power systems, or air supply pumps. Background technique [0002] Internal combustion engines used, for example, in automobiles use spark plugs to ignite the air-fuel mixture. For such spark plugs, it is increasingly required to improve the combustion in the engine in order to reduce fuel consumption or its exhaust emissions. Improvements in the combustion require improvements in the engine's thermal efficiency and compression ratio, however, this can lead to autoignition of the mixture in the combustion chamber of the engine, thus causing engine knock. [0003] The engine knock can be reduced by improving the cooling system such as a water jacket, which is arranged around the piston head to enhance the cooling of the engine. [0004] In order to improve the performance of the engine and the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/20
Inventor 阿部信男川岛泰后藤常利
Owner DENSO CORP