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Spark plug and engine

A technology of spark plugs and insulators, applied in the field of spark plugs, can solve the problems of low reliability of spark plugs and easy erosion of spark plugs, etc., and achieve the effect of improving durability

Active Publication Date: 2021-06-15
ZHUZHOU TORCH SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art that the spark plugs are easily eroded and the reliability of the spark plugs is low under the environment of high tumble flow and high-pressure fuel injection in the engine combustion chamber, an engine combustion chamber working under high tumble flow and high-pressure fuel injection pressure is provided. Spark plug with excellent durability

Method used

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  • Spark plug and engine
  • Spark plug and engine
  • Spark plug and engine

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A spark plug such as figure 1 The shown includes a cylindrical insulator 2, the center of the insulator is provided with a stepped shaft hole along the axial direction, the center electrode 9 is arranged in the shaft hole, the outer side of the insulator 2 is wrapped with a metal shell 6, and the side electrode 10 is welded on the metal shell 6 and connected to the center. The electrodes 9 are oppositely arranged. The end of the central electrode 9 is welded with a noble metal end 12, and the side electrode 10 is provided with a noble metal end 11 opposite to the central electrode end, and there is a gap between the noble metal ends 11 and 12. A resistor body 7 is provided in the shaft hole opposite to the end of the center electrode 9. The resistor body includes a 7A resistor material, a 7B upper seal material, and a 7C lower seal material. The adjacent resistor body in the shaft hole is also provided with a wiring screw 1. The screw rod is connected with the ground n...

Embodiment 2

[0029] The difference between this embodiment and Embodiment 1 is that the overall structure of the fusion zone 902 coincides with the radial projection of the insulator 2 . The terminal connection lines on both sides of the end of the insulator are in the positive direction of the overall structure of the fusion zone. The terminal connection lines on both sides of the end of the insulator form a space with the insulator 2 , and the fusion zone 902 is entirely wrapped in the space. The distance between the end surface of the noble metal terminal 12 and the terminal connection line on both sides of the end of the insulator is +1mm to 0mm.

[0030] The spark plug of the present invention and four samples with different characteristics of the existing spark plug are selected to carry out durability assessment on the engine stand, and the technical effect of the present invention is verified as follows.

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Abstract

The invention provides a spark plug. The spark plug comprises a cylindrical insulator, an axial hole formed in the center of the insulator in the axis direction and a central electrode arranged in the axial hole; a precious metal end is welded to the end of the central electrode; a fusion area is formed at a welding position; and the fusion area coincides with the radial projection of the insulator. Since the fusion area and the projection of the insulator has an overlapping area, so that fuel oil sprayed out at high pressure can be prevented from directly acting on the fusion area, the fusion area on the central electrode is prevented from forming holes after being repeatedly scoured by the high-pressure fuel oil, and the corrosion resistance is improved.

Description

technical field [0001] The invention relates to a spark plug, in particular to a spark plug for a high-pressure fuel injection engine; the invention also relates to a high-pressure fuel injection engine. Background technique [0002] In recent years, with the increasingly stringent emission regulations, in order to achieve higher thermal efficiency, engines have adopted technologies such as high tumble flow, high-energy ignition, high-pressure fuel injection, and direct injection in cylinders, which have brought higher challenges to spark plugs. On the one hand, the operating voltage of the spark plug has increased by nearly 10KV compared with the previous engine. On the other hand, the durability of the spark plug has been challenged, which has caused concerns about the life of the spark plug. In traditional engines using this type of technology, precious metal spark plugs are often used. For example, the ignition end of the center electrode is laser-welded with an Ir alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/20H01T13/34
CPCH01T13/20H01T13/34
Inventor 李耀邓钧
Owner ZHUZHOU TORCH SPARK PLUG CO LTD
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