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Spark plug for internal combustion engine and method of manufacturing the same

A manufacturing method and spark plug technology, which are applied in spark plug manufacturing, spark plugs, electrical components, etc., can solve the problem of reducing the heat dissipation performance of the ground electrode, improve the resistance to spark loss and ignition, suppress the damage of thermal stress balance, and improve the resistance to thermal stress. peeling effect

Active Publication Date: 2012-06-13
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the heat dissipation performance of the ground electrode is further reduced, which may make the above problems more significant.

Method used

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  • Spark plug for internal combustion engine and method of manufacturing the same
  • Spark plug for internal combustion engine and method of manufacturing the same
  • Spark plug for internal combustion engine and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0063] figure 1 It is a partially cutaway front view showing the spark plug 1 . In addition, in figure 1 Herein, the axis X direction of the spark plug 1 is described as the vertical direction in the drawing, the lower side is the front end side of the spark plug 1 , and the upper side is the rear end side.

[0064] The spark plug 1 is composed of a cylindrical insulator 2 as an insulator, a cylindrical metal case 3 holding the insulator 2, and the like.

[0065]A shaft hole 4 is formed through the insulator 2 along the axis X. Furthermore, the center electrode 5 is inserted and fixed at the front end side of the shaft hole 4 , and the terminal electrode 6 is inserted and fixed at the rear end side of the shaft hole 4 . A resistor 7 is arranged between the center electrode 5 and the terminal electrode 6 in the shaft hole 4, and both ends of the resistor 7 are electrically connected to the center electrode 5 and the terminal electrode 6 via conductive glass sealing layers 8 ...

no. 2 Embodiment approach

[0100] Next, refer to Figure 11 ~ Figure 16 A second embodiment will be described. In addition, in this embodiment, in particular, the structure of the fusion zone 34 and the method of joining the ground electrode 27 and the noble metal tip 32 are different from the above-mentioned first embodiment, so the following description will focus on these. Also in this embodiment, as in the above-mentioned first embodiment, the cross-sectional area of ​​the fusion portion B on the front end side is formed to be 1.1 to 1.3 times the cross-sectional area of ​​the fusion portion A on the proximal end side in the cross-section along the central axis. , and the total cross-sectional area of ​​the cross-sectional area of ​​the proximal fusion portion A and the cross-sectional area of ​​the distal fusion portion B is 4.0 mm 2 above. In addition, in the central axis cross-section, the cross-sectional area of ​​the ground electrode side melting portions D1, D2 is set to be 1.0 to 2.0 times ...

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Abstract

The invention provides a spark plug for an internal combustion engine and its manufacturing method for restraining noble metal tip peel-off caused by heat stress difference and elongating the service life of the spark plug. The spark plug has a ground electrode and a noble metal tip bonded to the ground electrode via a molten bond formed by melting metal materials and noble metal materials. The molten bond comprises a base-end-side molten bond (A) positioned at a base end side of the ground electrode and a cross-sectional area of a front-end-side molten bond (B) positioned at a front end side of the ground electrode, the sum of a cross-sectional area of which is equal to or greater than 4 mm<2> when viewed in a cross-section including a center axis of the noble metal tip along a longitudinal direction of the ground electrode; the cross-sectional area of the front-end-side molten bond (B) is 1.1 to 1.3 times greater than that of the base-end-side molten bond (A).

Description

technical field [0001] The invention relates to a spark plug used in an internal combustion engine and a manufacturing method thereof. Background technique [0002] A spark plug for an internal combustion engine is attached to an internal combustion engine (engine) to ignite the air-fuel mixture in the combustion chamber. A typical spark plug includes an insulator with a shaft hole, a center electrode passing through the shaft hole, a metal shell disposed on the outer periphery of the insulator, and a ground electrode disposed at the front end of the metal shell and forming a spark discharge gap with the center electrode. [0003] In addition, in order to improve spark wear resistance and ignitability, a noble metal tip made of a noble metal alloy such as platinum is bonded to a tip portion of a ground electrode made of a heat-resistant and corrosion-resistant metal such as a nickel alloy. When joining a noble metal tip to a ground electrode, a technique of spot welding wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/39H01T13/32H01T21/02
CPCH01T13/32H01T13/39H01T21/02
Inventor 龟田裕之
Owner NGK SPARK PLUG CO LTD