spark plug

A technology of spark plugs and insulators, applied in the field of spark plugs, can solve the problems of carbon burning of insulators, etc., and achieve the effects of improving fouling resistance, simple structure, and ensuring fouling resistance.

Active Publication Date: 2020-08-25
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 carbon deposited on the insulator is burned

Method used

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Examples

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Embodiment

[0075] The present invention is explained in more detail by way of examples, but the present invention is not limited to the examples.

[0076] Samples 1 to 30 of the spark plug 10 incorporating various insulators 40 were produced, and the fouling properties and withstand voltage were evaluated. As shown in Table 1, in samples 1 to 30, the arithmetic mean roughness (Ra) of the outer peripheral surface 45b of the front end portion 45 of the insulator 40, the depth D of the concave portion 53, the width W of the concave portion 53, the number of the concave portion 53, the second The value (length ratio) obtained by dividing the length L2 of the region 57 by the length L1 of the first region 56 and the position (angle) of the concave portion 53 with respect to the first region 56 are different. In addition, the length L of the recessed part 53 was set to 15 mm in all the samples 1-30. In addition, in the sample in which the plurality of recesses 53 were formed, the recesses wer...

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Abstract

The present invention provides a spark plug capable of securing fouling resistance with a simple structure. The insulator having the step portion formed on the outer peripheral surface has the center electrode arranged in the shaft hole. The cylindrical main body metal fitting in which the stepped portion and the ledge portion are formed on the inner peripheral surface is disposed radially outward of the insulator. The front end portion of the insulator is closer to the front end side than the step portion in the insulator. The arithmetic mean roughness in the circumferential direction of the outer peripheral surface of the tip portion is 0.5 μm or less. A concave portion having a depth of 3 to 20 μm is provided extending from the front end side to the rear end side on at least a part of the end surface and the outer peripheral surface of the front end portion.

Description

technical field [0001] The present invention relates to a spark plug, and relates to a spark plug capable of securing fouling resistance. Background technique [0002] In general, a spark plug is such that a metal body to which a ground electrode is connected is insulated and holds a center electrode via an insulator. The spark plug generates a spark discharge between the ground electrode and the center electrode in the combustion chamber of the internal combustion engine to ignite the air-fuel mixture. However, carbon generated due to incomplete combustion, etc. is deposited on the surface of the insulator and the insulation resistance is reduced. When a voltage is applied When the voltage is lower than the required voltage (the voltage at which spark discharge occurs), spark discharge will no longer occur. Therefore, various techniques for preventing fouling of insulators due to carbon deposition have been developed. [0003] For example, Patent Document 1 discloses a te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/20
CPCH01T13/20H01T13/14H01T13/06H01T13/32
Inventor 井笹纯平中野成治黑野启一田中邦治横山裕吉田治树近藤俊
Owner NGK SPARK PLUG CO LTD
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