Additive-Manufactured Spark Plug Cooling for Electrode Heat Control
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Solution Overview
Problem
Spark plugs face challenges with electrode erosion and corrosion due to high temperatures and thermal stresses, which can lead to pre-ignition and reduced performance, and existing manufacturing techniques struggle to effectively integrate thermally conductive cores for cooling within additive manufactured components.
Innovation Solution
A spark plug design featuring a ground electrode with internal cooling passages filled with heat conducting materials, aligned with corresponding passages in the shell, allowing for passive or active heat removal from the sparking surface, manufactured using additive processes like powder bed fusion to create intricate cooling features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional manufacturing techniques are used to insert thermally conductive cores into electrodes, then cooling features can be integrated, but the manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The patent combines the electrode structure and cooling passages into a single integrated component manufactured through additive manufacturing. The thermally conductive core is not separately inserted but is built as an integral part of the electrode during the 3D printing process, eliminating the need for separate insertion and assembly steps while maintaining effective thermal conduction from the electrode to the cooling channels.
Solution Approach 2:
The additive manufacturing process serves multiple functions simultaneously: it creates the electrode geometry, forms the internal cooling passages, and positions the thermally conductive materials all in one manufacturing operation. This multi-functional approach replaces multiple traditional manufacturing steps (electrode fabrication, core insertion, thermal material placement) with a single versatile process.
2Adaptability or versatility
If additive manufacturing is used to create spark plug electrodes, then design flexibility improves, but the ability to effectively produce electrodes with integrated cooling features is limited
Solution Approach 1:
The patent applies different materials with specific thermal properties to different regions of the electrode structure. Thermally conductive materials are strategically placed in areas requiring heat dissipation, while other regions use materials optimized for electrical insulation or structural integrity. This localized material selection ensures effective cooling where needed while maintaining overall component performance.
Solution Approach 2:
The electrode assembly uses composite construction combining materials with different properties: electrically conductive materials for the electrode, thermally conductive materials for heat transfer, and thermally insulating materials for the housing. These composite materials work together to achieve both electrical functionality and thermal management in the additive manufactured spark plug.
3Productivity
If higher temperatures are used for combustion to meet emission requirements, then combustion efficiency improves, but electrode erosion and thermal stress increase
Solution Approach 1:
The patent converts the harmful high-temperature environment into a beneficial cooling opportunity by implementing internal cooling passages that actively remove heat from the electrode. The thermal energy that would otherwise cause erosion and damage is captured and dissipated through the cooling system, allowing the spark plug to operate at higher temperatures needed for efficient combustion while protecting the electrode materials from thermal degradation.
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
The design effectively reduces electrode temperatures, enhancing spark plug durability and performance by efficiently dissipating heat, addressing the issues of erosion and thermal stress, while enabling efficient thermal management through additive manufacturing techniques.
Implementation Method 1
a first heat conducting material situated within the first internal cooling passage... the first heat conducting material is thermally coupled to the second heat conducting material so that, during operation, the cooling feature can remove heat from an area near a sparking surface
Data Source
AI summary
A spark plug having one or more cooling feature(s) that reduce the temperature of a ground electrode and can be manufactured using an additive manufacturing process. The cooling feature(s) include internal cooling passages that can be filled with either a heat conducting solid (passive cooling example) or a heat conducting fluid (active cooling example). In the passive cooling example, the internal cooling passage is filled with a heat conducting solid that is inserted into the passage, melted and solidified such that it forms a metallic bond with the walls of the passage. In the active cooling example, the internal cooling passage is filled with a heat conducting fluid that flows through the passage and removes heat from the ground electrode. In both examples, internal cooling passage(s) of the ground electrode are aligned with corresponding cooling passage(s) formed in the shell.