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Spark plug for use in an internal-combustion engine

A technology for internal combustion engines and spark plugs, which is applied in the field of spark plugs for internal combustion engines, can solve problems such as the impossibility of spark plug ignition stability, and achieve the effects of preventing rebound, corrosion, and deterioration of ignition performance

Active Publication Date: 2007-09-26
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 ignitability of the spark plug cannot be stabilized

Method used

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  • Spark plug for use in an internal-combustion engine
  • Spark plug for use in an internal-combustion engine
  • Spark plug for use in an internal-combustion engine

Examples

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no. 1 example

[0054] A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view showing the entire configuration of a spark plug according to the present embodiment, and FIG. 2 is a partially cutaway front view showing main components. Hereinafter, the present invention will be described mainly with reference to FIG. 2 .

[0055] As shown in FIG. 2 and the like, the spark plug 100 according to the present embodiment is composed of a metal case 1 , an insulator 2 , a center electrode 3 and a ground electrode 4 . Although no specific reference numeral is assigned, a contact terminal electrically connected to the center electrode 3 through a resistor or a glass seal portion on the rear end side of the insulator 2 and the like are also provided. The metal case 1 has a cylindrical shape, and the insulator 2 is held in the metal case 1 by talc, packing, or the like. The front end portion of the insulator 2 protrudes fro...

no. 2 example

[0083] Next, a second embodiment of the present invention will be explained. In this embodiment, any part that is the same as that of the first embodiment is denoted by the same reference numeral, and a detailed description thereof will be omitted. Portions different from the first embodiment will be mainly explained.

[0084] The spark plug according to this embodiment is also composed of a metal case 1 , an insulator 2 , a center electrode 3 and a ground electrode 4 . In this embodiment, the constitution of the ground electrode 4 is different from that of the first embodiment.

[0085] Similar to the first embodiment, the main body of the ground electrode 4 has a two-layer structure composed of an outer layer 4A and an inner layer 4B, and the outer layer 4A in this embodiment is also composed of a nickel alloy such as Inconel 600 or the like. On the other hand, the inner layer 4B in the second embodiment is composed of high-purity nickel (for example, pure nickel: includin...

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Abstract

The present invention provides a spark plug 100 comprised of a metal shell 1, an insulator 2, a center electrode 3 and a ground electrode 4. A rear-end face of the ground electrode 4 is welded to a front-end face of the metal shell 1, and a bent portion 5 located at the intermediated position in the longitudinal direction is bent toward the center of the spark plug 100. The ground electrode 4 assumes a circular-shape with a diameter of 2 mm or less whereby an inflow of an air-fuel mixture is not disturbed even when the air-fuel mixture directly flows into a back face of the ground electrode 4. The ground electrode 4 is comprised of an outer layer 4 A made of a nickel alloy and an inner layer 4 B made of pure copper with an excellent thermal conductivity, in which a ratio of a cross-sectional area of the inner layer 4 B to the entire cross-sectional area of the ground electrode 4 is 10% or more to 35% or less. Thus, the spark plug 100 which is excellent in heat sinking ability and can prevent a spring back phenomenon due to a difference in a coefficient of thermal expansion.

Description

technical field [0001] The invention relates to a spark plug for an internal combustion engine. Background technique [0002] A spark plug for an internal combustion engine such as a vehicle engine includes, for example, a center electrode, an insulator provided outside the center electrode, a cylindrical metal case arranged outside the insulator, and a ground electrode whose rear portion is joined to a front end surface of the metal case. . The cross-section of the ground electrode has a substantially rectangular shape, and the ground electrode is arranged such that the inside face of its front end portion faces the front end face of the center electrode. Therefore, a spark discharge gap is formed between the front end portion of the center electrode and the front end portion of the ground electrode. [0003] A threaded portion (not shown) is formed on the outer peripheral surface of the metal case. The spark plug is attached to the engine in such a manner that the threa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/20H01T13/39
CPCH01T13/39H01T13/32
Inventor 鸟居计良吉田和正松谷涉
Owner NGK SPARK PLUG CO LTD
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