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Spark plug with improved seal

A seal and spark plug technology, applied in the field of glass seals, can solve problems such as spark plug failure, insulator dielectric failure, etc.

Inactive Publication Date: 2019-08-02
TENNECO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of this dielectric breakdown caused by gas is especially pronounced when the air bubbles or pores are large, in which case dielectric failure of the insulator may occur
Dielectric perforation through the insulator to the expansion glass seal can lead to failure of the spark plug

Method used

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Examples

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Embodiment Construction

[0015] One aspect of the invention provides a spark plug 20 that includes a conductive glass seal 22 that provides a gas-tight bond between at least one conductive component (eg, center electrode 24) and an insulator 26, such as figure 1 and 2 shown. The composition of the glass seal 22 reduces the likelihood of dielectric breakdown and thus reduces dielectric penetration through the insulator 26 ( dielectric puncture).

[0016] Conductive glass seal 22 is formed from a material, typically a powder mixture, including conductive particles, at least one binder, an expansion agent, and glass frit. In an exemplary embodiment, glass seal 22 includes 10.0-50.0 weight percent (wt %), preferably 20.0 wt , conductive particles based on the total weight of glass seal 22 . The powder mixture used to form the glass seal 22 includes 10.0-50.0 wt % conductive particles based on the total weight of the powder used to form the glass seal 22 . The conductive particles may comprise a single...

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Abstract

An electrically conductive glass seal for providing a hermetic bond between an electrically conductive component and an insulator of a spark plug is provided. The glass seal is formed by mixing glassfrits, binder, expansion agent, and electrically conductive metal particles. The glass frits can include silica (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3), bismuth oxide (Bi2O3), and zinc oxide (ZnO); the binder can include sodium bentonite or magnesium aluminum silicate, polyethylene glycol (PEG), and dextrin; the expansion agent includes lithium carbonate; and the electrically conductiveparticles include copper. The finished glass seal includes the glass in a total amount of 50.0 to 90.0 weight (wt. %), and electrically conductive metal particles in an amount of 10,0 to 50,0 wt. %,based on the total weight of the glass seal.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application No. 15 / 225,216, filed August 1, 2016, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates generally to glass seals for ignition devices, and more particularly to spark plugs including glass seals, and methods of forming the same. Background technique [0004] Glass seals are commonly used to form a gas-tight bond between a conductive component (such as a center electrode) and an ignition device's insulator (such as a spark plug). The glass seal of the spark plug is usually formed by placing glass powder in the hole of the insulator, then firing the insulator, center electrode and glass powder together in a furnace. The heat also expands some parts of the glass seal, creating an airtight bond between the insulator and the center electrode. However, when the glass powder between the center ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/34
CPCC03C3/066C03C3/091C03C4/14C03C8/04C03C8/16C03C8/18C03C8/24H01T13/34H01B1/16H01T13/08
Inventor K·弗斯滕伯格W·J·小沃克
Owner TENNECO INC
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