Optimized Spark Plug Design for Enhanced Reliability and Noise Control
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Summary
Problems
Conventional spark plugs with Ti components in the resistor face challenges in balancing load life performance and radio-noise-preventing properties, as excessive Ti reduces resistance but deteriorates noise prevention, while insufficient Ti worsens load life.
Innovation solutions
A spark plug design incorporating a resistor with a specific composition of glass, Ti, Zr, and non-metallic conductive materials, where the Ti content is dispersed between 0.5 wt.% to 15 wt.% across continuous regions, and Zr content is between 10 wt.% to 40 wt.%, enhancing current flow and preventing material removal, thus optimizing both performance metrics.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the amount of Ti component incorporated into the resistor is increased, then load life performance is improved, but electric resistance is greatly reduced resulting in deterioration of radio-noise-preventing property
Why choose this principle:
The patent applies local quality by creating non-uniform Ti component distribution in the resistor. Specifically, the Ti component concentration varies between the conduction path portion (0.5-15 wt.%) and the non-conduction path portion (5-30 wt.%), allowing different regions to serve different functions: the conduction path maintains appropriate resistance for radio noise prevention while the non-conduction path has higher Ti content to prevent carbon oxidation and improve load life.
Principle concept:
If the amount of Ti component incorporated into the resistor is increased, then load life performance is improved, but electric resistance is greatly reduced resulting in deterioration of radio-noise-preventing property
Why choose this principle:
The resistor is segmented into functionally distinct regions based on Ti component concentration. The conduction path portion and non-conduction path portion are separated by glass phase distribution, with each segment optimized for its specific role: current conduction with controlled resistance versus oxidation prevention.
Application Domain
Data Source
AI summary:
A spark plug design incorporating a resistor with a specific composition of glass, Ti, Zr, and non-metallic conductive materials, where the Ti content is dispersed between 0.5 wt.% to 15 wt.% across continuous regions, and Zr content is between 10 wt.% to 40 wt.%, enhancing current flow and preventing material removal, thus optimizing both performance metrics.
Abstract
[Objective] To improve both load life performance and radio-noise-preventing property in a spark plug including a resistor containing a Ti component. [Means for Solution] A spark plug includes a circular columnar insulator (2) having a through hole (6), a center electrode (3), a terminal shell (13), and a resistor (15) which is provided in the through hole (6) and between the terminal shell (13) and the center electrode (3), and which contains glass, a Ti component, a Zr component, and a non-metallic electrically conductive material. In a cross section of a conduction path portion of the resistor(15), the conduction path portion containing the Zr component and the Ti component, the average of the Ti component contents by weight of five continuous circular regions, each region having a diameter of 20 µm, is 0.5 wt.% to 15 wt.%; and when A represents the average of the Ti component contents by weight of any 30 circular regions in the conduction path portion, and when B represents the Ti component content by weight of each of the 30 circular regions, the total of the number of circular regions in which B is less than 0.25 times A and the number of circular regions in which B is greater than 3.0 times A is 2 or less.