Spark Plug End Part Segmentation for Heat Dissipation
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Solution Overview
Problem
Existing spark plugs with complex components are difficult to produce efficiently, and they often lack optimal current conduction and thermal conductivity, which affects their performance and stability in mass production.
Innovation Solution
A spark plug design featuring a ground electrode carrier with a cylindrical ring-shaped cross-section, positioned at a distance from the chamber wall, allows for independent manufacturing and adjustment, enhancing current and heat conduction while improving ignition performance through a compact electrode structure and efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ground electrode carrier is integrated with the chamber wall, then the structure is more compact, but the current conduction and heat dissipation paths are restricted and the components are harder to manufacture independently
Solution Approach 1:
The ground electrode carrier is separated from the chamber wall into two independent components. The carrier can be manufactured separately with optimized current conduction paths and heat dissipation features, then mounted to the chamber wall. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The ground electrode carrier acts as an intermediary component between the chamber wall and the ground electrodes. It provides a dedicated mounting structure that facilitates optimal current conduction and heat dissipation while maintaining structural integrity, resolving the conflict between compactness and functional performance.
2Length of moving object
If the ground electrodes are positioned close to the chamber wall, then the electrode height can be reduced, but the heat dissipation efficiency decreases
Solution Approach 1:
Heat dissipation is enhanced by utilizing the radial dimension through the chamber wall rather than relying solely on axial electrode height. The ground electrode carrier conducts heat laterally to the chamber wall, which acts as a heat sink, allowing for shorter electrode heights while maintaining effective heat dissipation through a different dimensional pathway.
3Reliability
If complex components are used to achieve optimal current conduction and heat dissipation, then the electrical properties improve, but the manufacturing complexity and cost increase
Solution Approach 1:
By segmenting the ground electrode carrier from the chamber wall, each component can be manufactured using simpler, more cost-effective processes. The carrier can be produced as a separate casting or formed piece, avoiding the need for complex integrated machining operations, while still achieving optimal electrical properties through its dedicated design.
Solution Approach 2:
The ground electrode carrier is designed to self-facilitate optimal current conduction and heat dissipation through its geometric configuration and material properties, eliminating the need for additional complex components or post-manufacturing adjustments. The structure itself provides the necessary electrical and thermal management functions.
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 production, ensures better current conduction and heat dissipation, and improves ignition reliability, stability, and corrosion resistance, while maintaining or exceeding the electrical properties of comparable spark plugs.
Implementation Method 1
improved heat dissipation from the ignition electrodes to the end part and to the spark plug housing
Implementation Method 2
optimal current conduction via the individual ground electrodes must be ensured
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The present invention relates to a spark plug of an internal combustion engine, preferably for spark-ignition gas engines, comprising a spark plug housing (2) that surrounds an insulating body (1) and comprising a center electrode (3) and at least one ground electrode (4) borne by a ground electrode carrier (6), wherein the ignition surfaces (12) of the center electrode (3) and the ignition surface (26) of the ground electrode (4) are surrounded by a wall (8), which forms a chamber (5) open on the combustion chamber side or a pre-chamber (51) having passage openings (10). According to the invention, an end part (60) is attached to the end area of the spark plug housing (2) on the combustion chamber side, and the ground electrode carrier (6) and the wall (8) are borne by said end part (60).