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Spark plug with tapered fired-in suppressor seal

A spark plug and suppressor technology, applied in the field of spark plugs, can solve problems such as labor consumption and cost increase

Inactive Publication Date: 2009-07-01
FEDERAL MOGUL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is readily understood that this particular coating process applied to the contact pins and / or the central electrode is labor intensive and adds cost

Method used

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  • Spark plug with tapered fired-in suppressor seal
  • Spark plug with tapered fired-in suppressor seal
  • Spark plug with tapered fired-in suppressor seal

Examples

Experimental program
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Embodiment Construction

[0015] Referring to the drawings, in which like numerals designate like or corresponding parts throughout the several views. A spark plug according to the invention is shown at 10 in FIG. 1 . The spark plug 10 includes a tubular ceramic insulator, generally indicated at 12, which is preferably formed from alumina ceramic or other suitable material having specific dielectric strength, high mechanical strength, and excellent resistance to thermal shock. The insulator 12 can be formed dry under extreme pressure and then kiln-fired at high temperature to vitrify. However, those skilled in the art will appreciate that methods other than dry pressing and sintering may be used to form insulator 12 . Insulator 12 has an exterior surface that is preferably brightened with exposed portions thereof using a lead-free material, such as disclosed in U.S. Patent No. 5,677,250 to Knapp, issued October 14, 1997, and assigned to the present invention. assignee. The insulator 12 may include a...

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PUM

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Abstract

A spark plug (10) for a spark ignited internal combustion engine includes a suppressor seal pack (54) interposed between an upper terminal stud (46) and a lower center electrode (60). The suppressor seal pack (54) includes a top layer of conductive glass (52) surrounding the bottom end (50) of the terminal stud (46) and a lower glass seal layer (58) surrounding a head (62) of the center electrode (60). A resistor layer (56) fills the space between the conductive glass layers (52, 58). The resistor layer (56) has a larger first cross-sectional area (76) at its upper end and a smaller second crosssectional area (78) at its lower end. A reducing taper (80) establishes a progressive transition between the greater and lesser cross-sectional areas (76, 78). The reducing taper (80) is located in a large shoulder region (LS) which is defined as the longitudinal dimension between the theoretical reference point (70) and the theoretical reference point (68).

Description

technical field [0001] This invention relates to a spark plug for a spark ignition internal combustion engine, and more particularly to a spark plug having a fired-in suppressOr seal pack between an upper stud post and a lower center electrode spark plug. Background technique [0002] A spark plug is a device that extends into the combustion chamber of an internal combustion engine and produces a spark to ignite the fuel-air mixture. In operation, up to about 40,000 volts of electrical power is applied through the center electrode of the spark plug, causing a spark to jump across the gap between the center electrode and the opposing ground electrode. [0003] Electromagnetic Interference (EMI), also known as Radio Frequency Interference (RFI), occurs when electrical discharges occur between spark gaps. This phenomenon is due to the very short duration high frequency, high current oscillations upon initial breakdown of the gap and upon re-ignition. This EMI or RFI can inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M57/06
CPCH01T13/41F02M57/06
Inventor 约翰·W·霍夫曼詹姆斯·D·吕科瓦基
Owner FEDERAL MOGUL CORP