Spark Plug Ground Electrode Carrier Segmentation
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Solution Overview
Problem
Existing spark plug manufacturing processes are complex and costly, with suboptimal electrical and thermal properties, leading to inefficient current conduction and heat dissipation, which affects ignition stability and reliability in mass production.
Innovation Solution
The spark plug design features a ground electrode carrier arranged independently from the chamber wall, allowing for improved current and heat conduction, with integral production of ground electrodes and carrier, and a cylindrical ring cross-section for enhanced heat dissipation and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ground electrodes are integrated directly into the chamber wall, then manufacturing is simpler, but current conduction becomes unstable and heat dissipation is reduced
Solution Approach 1:
The ground electrode system is segmented into two independent components: the ground electrode carrier and the ground electrodes themselves. The carrier is arranged at a distance from the chamber wall, creating an independent current conduction path that is not affected by wall geometry variations. This segmentation allows stable current conduction while maintaining manufacturing simplicity through discrete production of components.
Solution Approach 2:
The ground electrode carrier acts as an intermediary component between the ground electrodes and the chamber wall. It provides a stable mounting structure with constant clearance from the wall, ensuring reliable electrical connection and heat dissipation without requiring direct integration into the complex chamber wall geometry.
2Device complexity
If ground electrodes are integrated directly into the chamber wall, then structural complexity is reduced, but heat dissipation efficiency decreases
Solution Approach 1:
By separating the ground electrode carrier from the chamber wall structure, the patent creates an independent thermal conduction path. The carrier can be optimally positioned and designed for heat dissipation without being constrained by wall integration requirements, improving thermal efficiency while maintaining acceptable structural complexity.
Solution Approach 2:
The ground electrode carrier is positioned in a third dimension away from the chamber wall, creating spatial separation. This dimensional change allows optimized heat dissipation geometry and thermal pathways that would be difficult to achieve through planar integration into the wall structure.
3Manufacturing precision
If ground electrodes are produced as integral components with the carrier, then manufacturing precision is improved, but production complexity increases
Solution Approach 1:
The ground electrode system is divided into the carrier and electrode components, which can be produced separately with high precision using discrete manufacturing methods. This segmentation allows each component to be optimized for its specific manufacturing process while maintaining overall system precision through careful design of the assembly interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies manufacturing, ensures stable construction, and enhances ignition performance by maintaining constant current conduction and heat dissipation, reducing the risk of self-ignition while improving electrical and thermal properties.
Implementation Method 1
improved heat dissipation from the spark electrodes to the spark plug housing is obtained
Implementation Method 2
optimal current conduction across the individual ground electrodes has to be provided
Data Source
AI summary
The invention relates to a spark plug of an internal combustion engine, preferably for spark-ignition gas engines, comprising a spark plug housing that surrounds an insulating body and comprising a center electrode and at least one ground electrode supported by a ground electrode carrier, wherein the ignition surface of the center electrode and the ignition surface of the ground electrode are surrounded by a wall, which forms a chamber open on the combustion chamber side. According to the invention, the ground electrode carrier, as viewed perpendicularly to the longitudinal axis (A) of the spark plug, is spaced further apart from the center electrode than the outer surface of the wall of the chamber therefrom and supports at least one finger-shaped ground electrode, which extends into the chamber through an opening in the wall, wherein the ignition surface of the ground electrode lies at the same height as the ignition surface of the center electrode in the chamber.