spark plug

A technology of spark plugs and electrodes, which is applied in the field of spark plugs, can solve problems such as fusion zone wear and intermediate piece wear, and achieve the effects of suppressing deformation, improving wear resistance, and suppressing spark wear

Active Publication Date: 2020-03-31
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the technique disclosed in Patent Document 1, local wear (hereinafter also referred to as "gouging") of the fusion zone may occur during use at a high temperature.
In the technique disclosed in Patent Document 2, wear and tear of intermediate parts may occur when an engine with a supercharger is used at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (Formation of samples 1 to 38)

[0073] The experimenter prepared various cylindrical ends 22 of the same size made of the composition shown in Table 1, consisting of 75.0wt% of Ni, 23.5wt% of Cr, 0.5wt% of Al, 1.0wt% of Si and An intermediate member 20 having a column portion 20a and a flange portion 20b of the same size and composed of unavoidable impurities below the detection limit. After butting the end faces of the tip 22 and the intermediate member 20 to each other, a laser beam was irradiated to the boundary between the tip 22 and the intermediate member 20 over the entire circumference by a fiber laser welding machine. Between the terminal 22 and the intermediate member 20 , a melting portion 21 in which all butted end faces are melted and disappeared is formed, and the terminal 22 and the intermediate member 20 are joined. It should be noted that even if the composition of the end head 22 is different, the length of the welded end head 22 in the axis O direct...

Embodiment 2

[0096] (Formation of samples 39 to 70)

[0097] The experimenter prepared various cylindrical ends 22 of the same size made of the composition shown in Table 2, consisting of 75.0wt% of Ni, 23.5wt% of Cr, 0.5wt% of Al, 1.0wt% of Si and Spark plugs 10 of samples 39 to 70 were obtained in the same manner as in Example 1 from an intermediate member 20 having a column portion 20 a and a flange portion 20 b of the same size composed of unavoidable impurities below the detection limit.

[0098] 【Table 2】

[0099]

[0100] In Example 2, Rh, Ir, and Ru were used as elements of the R group, and Ni, Co, and Fe were used as elements of the Ni group. Samples 56 to 59 contained Mn and Cr in addition to Pt, R group, and N group. Table 2 describes the composition (mass %) of the alloy constituting the tip 22, the total (mass %) of the contents of Pt, Rh, and Ni, the total (mass %) of the contents of Pt, R group, and N group, R The value obtained by dividing the content rate of the grou...

Embodiment 3

[0115] The experimenter prepared a cylindrical tip 22 of the same size composed of 70wt% of Pt, 20wt% of Rh, 10wt% of Ni and unavoidable impurities below the detection limit. The spark plugs 10 of samples 71 to 78 were obtained in the same manner as in Example 1 for various intermediate members 20 including the pillar portion 20a and the flange portion 20b.

[0116] 【table 3】

[0117]

[0118] Table 3 describes the composition (mass %) of the alloy constituting the intermediate material 20 . The composition analysis of the middleware 20 was carried out in the same manner as in the first embodiment.

[0119] (Evaluation of wear and tear of middleware)

[0120] After performing the same durability test as in Example 1 for each sample, the tester evaluated the wear of the intermediate member 20 in the same manner as in Example 1. The results are described in the column of "middleware wear" in Table 3.

[0121] (result)

[0122] Samples 73 to 78 containing 50 mass % or mor...

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Abstract

The present invention provides a spark plug capable of improving the wear resistance of an intermediate member and a melting portion. The spark plug includes: an intermediate piece composed of an alloy mainly composed of Ni and welded to the electrode base material in a state protruding from the electrode base material; a tip composed of an alloy mainly composed of Pt; into the fusion zone. The terminal contains: 6% by mass or more of Rh; at least one selected from the group R consisting of Rh, Re, Ir, Ru, W, Mo, and Nb; 5% by mass or more of Ni; At least one selected from the N group consisting of , Fe and Cu. Rh is the most contained in the R group, and Ni is the most contained in the N group. The total content of Pt, Rh, and Ni is 91% by mass or more, and the total content of Pt, R group, and N group is 95% by mass or more. The value obtained by dividing the content of the R group by the content of the N group is 0.7 or more and 8 or less.

Description

technical field [0001] The present invention relates to a spark plug, and more particularly to a spark plug in which a tip made of an alloy mainly composed of Pt is provided on an electrode. Background technique [0002] There is known a spark plug in which an intermediate piece is provided between a tip made of an alloy mainly composed of Pt and an electrode base material in order to suppress the flame extinguishing effect that the electrode takes energy from the flame nucleus. In the spark plug disclosed in Patent Document 1, the first electrode facing the second electrode across the spark gap includes: an electrode base material mainly composed of Ni; An intermediate piece welded to the electrode base material; and a fusion zone formed by fusing the intermediate piece and the end made of Pt-Rh. The first electrode of the spark plug disclosed in Patent Document 2 includes: an electrode base material mainly composed of Ni; an intermediate material mainly composed of Ni; an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/39
CPCH01T13/39C22C5/04H01T13/20H01T13/32H01T21/02
Inventor 角力山大典后泽达哉柴田勉
Owner NGK SPARK PLUG CO LTD
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