Spark plug

A spark plug and tip technology, applied in the field of spark plugs, can solve problems such as spark consumption at the front end, and achieve the effects of excellent durability, improved spark consumption resistance, and suppression of falling off

Active Publication Date: 2016-10-12
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the temperature in the combustion chamber tends to increase. When a spark discharge occurs between the front end of the ground electrode and the front end of the center electrode, which are formed of Ni alloy or the like, each of the opposing sides of the ground electrode and the center electrode The front end is prone to spark consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0073] [Test No.1-27]

[0074]

[0075] The tip is fabricated as follows. First, metal powder was mixed in the same mixing ratio as the metal base material shown in Table 1 and Table 2, and the green compact formed by mixing oxide powder in a predetermined ratio was degreased, and then vacuum Sintering is carried out in a neutral or non-oxidizing or reducing environment, thereby producing a cylindrical end with a relative density of more than 95%.

[0076] As described above, the center electrode and the ground electrode are prepared by preparing an alloy melt with a predetermined composition, performing wire drawing, etc., and making appropriate adjustments to form a predetermined shape and a predetermined size. A center electrode formed of a core made of a Cu alloy, and a ground electrode made of a Ni alloy.

[0077] Next, the ground electrode is joined to one end surface of the metal shell, and the produced end is joined to the end of the ground electrode of the metal s...

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Abstract

The objective of the present invention is to provide a spark plug having excellent durability by providing a central electrode and / or a grounding electrode with a tip having excellent resistance to spark-wear under high-temperature environment. The spark plug is provided with a central electrode and a grounding electrode disposed with a gap from the central electrode, said spark plug being characterized in that: there is a tip forming the gap on the central electrode and / or the grounding electrode; the tip has a metal matrix, whereof the main constituent is Ir, and oxide particles containing at least one species of oxide having a perovskite structure represented by the general formula ABO3 (where A is at least one species selected from the group 2 elements of the periodic table, and B is at least one species selected from the metal elements); and the proportion of the surface area occupied by the oxide particles upon observation of the cross section of the tip is 1% to 13% inclusive.

Description

technical field [0001] The present invention relates to spark plugs. In particular, it relates to a spark plug provided with a tip on at least one of a ground electrode and a center electrode. Background technique [0002] Spark plugs are used to ignite internal combustion engines such as motor vehicle engines. The spark plug usually has: a cylindrical main fitting; a cylindrical insulator arranged in the inner hole of the main fitting; a center electrode arranged in the inner hole of the front end side of the insulator; one end is joined to the front end of the main fitting and the other end is connected to the center Grounded electrode with a spark discharge gap between the electrodes. In addition, the spark plug performs spark discharge in the combustion chamber of the internal combustion engine in a spark discharge gap formed between the front end of the center electrode and the front end of the ground electrode to combust fuel filled in the combustion chamber. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/39C22C1/05C22C5/04B22F1/00
CPCC22C5/04C22C30/00H01T13/20C22C32/001B22F2998/10H01T13/39C22C1/1084B22F3/02B22F3/04B22F3/20B22F3/225B22F3/007B22F3/24B22F3/16C22C32/0031H01T13/32H01T21/02
Inventor 角力山大典金丸智纪
Owner NGK SPARK PLUG CO LTD
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