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spark plug

By adding appropriate amounts of iridium (Ir), nickel (Ni), cobalt (Co), iron (Fe) and other elements into the palladium (Pd) electrode chip, the spark consumption and reliability of the spark plug are improved, and the problem of the palladium electrode chip is solved The problem of easy peeling and cracking at high temperatures achieves better heat cycle resistance and lower risk of sweating.

Inactive Publication Date: 2011-12-07
NITERRA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since the melting point of Pd is lower than that of Pt, the spark consumption is poor, and if the combustion chamber temperature is high, it is easy to cause grain growth, peeling and cracks, so there is a problem of insufficient reliability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0044] B. Example

[0045] C. Modified example of embodiment

[0046] A. Implementation

[0047] ·Spark plug structure

[0048] figure 1 It is a partial sectional view of spark plug 100 according to one embodiment of the present invention. In addition, in figure 1 In the description, the axial direction OD of the spark plug 100 is defined as the vertical direction in the drawing, the lower side is defined as the front end side of the spark plug 100 , and the upper side is defined as the rear end side.

[0049] The spark plug 100 includes an insulator 10 , a main metal shell 50 , a center electrode 20 , a ground electrode 30 , and a terminal metal shell 40 . The center electrode 20 is held within the insulator 10 in a state extending in the axial direction OD. The insulator 10 functions as an insulator, and the metal shell 50 holds the insulator 10 . The terminal metal shell 40 is disposed at the rear end of the insulator 10 . In addition, regarding the structure of t...

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Abstract

The invention provides a spark plug. The spark plug (100) has a center electrode chip (90, 95) at the tip of the electrode. The center electrode chip (90, 95) is: mainly composed of Pd, the content of Pd is more than 40% by weight, and contains at least one element of Ir, Ni, Co, and Fe. When Ir is contained, the content of Ir is 0.5% by weight. % to 20% by weight, and when Ni, Co, and Fe are contained, the content of each element is 0.5% by weight to 40% by weight.

Description

technical field [0001] The present invention relates to the composition of an electrode chip provided on an electrode tip of a spark plug. Background technique [0002] In recent years, platinum (Pt) has been put into practical use among the materials of the electrode chip provided on the electrode tip of the spark plug. In addition, an electrode chip using palladium (Pd) as a substitute material for the rare metal Pt has been proposed (for example, Patent Document 1). [0003] Patent Document 1: Japanese Patent Publication No. 5-47954 [0004] Patent Document 2: Japanese Unexamined Patent Publication No. H10-22053 [0005] Patent Document 3: Japanese Patent Laid-Open No. 2002-83663 [0006] Patent Document 4: WO2008 / 014192 Publication [0007] However, since the melting point of Pd is lower than that of Pt, the spark consumption is poor, and if the combustion chamber temperature is high, crystal grains tend to grow, peeling and cracking occur, so there is a problem of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/39F02P13/00
CPCH01T13/39F02P13/00
Owner NITERRA CO LTD
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