Spark Plug Ground Electrode Orientation via Angled Threads
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Solution Overview
Problem
Existing spark plugs for internal combustion engines often fail to achieve reliable and efficient ignition of the fuel-air mixture due to improper positioning of the ground electrode, leading to inconsistent or inadequate combustion.
Innovation Solution
A spark plug design featuring a metal shell with threads formed at a predetermined angle relative to the ground electrode, ensuring the electrode is positioned optimally within the combustion chamber when threaded into the cylinder head, along with an orientation tool to accurately locate and align the ground electrode for thread formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ground electrode is attached to the shell lower surface without predetermined angular orientation, then the manufacturing process is simpler, but the electrode positioning in the combustion chamber becomes inconsistent and unreliable
Solution Approach 1:
The threads are formed at a predetermined angle relative to the ground electrode during the manufacturing process, establishing the correct spatial relationship before the spark plug is installed. This preliminary action ensures that when the shell is threaded into the cylinder head, the ground electrode automatically assumes the correct position in the combustion chamber without requiring additional positioning steps.
Solution Approach 2:
The thread orientation is deliberately made asymmetric relative to the ground electrode, with threads formed at a specific predetermined angle rather than symmetrically around the electrode. This asymmetric configuration creates a unique angular relationship that ensures proper electrode positioning in the combustion chamber when the spark plug is installed.
2Reliability
If the ground electrode is positioned without considering thread angle, then the manufacturing process is faster, but the ignition reliability of the fuel-air mixture deteriorates
Solution Approach 1:
The correct angular relationship between the threads and ground electrode is established during manufacturing rather than during installation. By performing the orientation-setting action preliminarily, the patent ensures reliable ignition positioning without adding significant time to the manufacturing cycle, as the orientation is integrated into the thread formation process itself.
Solution Approach 2:
The thread formation process and ground electrode orientation setting are merged into a single manufacturing operation. By combining these two functions, the patent achieves both efficient manufacturing and reliable electrode positioning without requiring separate steps, thus maintaining productivity while ensuring ignition reliability.
3Manufacturing precision
If the threads are formed at a predetermined angle relative to the ground electrode, then the electrode achieves optimal positioning in the combustion chamber, but the manufacturing process becomes more complex
Solution Approach 1:
The predetermined angular relationship is established as an integral part of the manufacturing process rather than as a separate adjustment step. This preliminary action allows the complex orientation requirement to be built into the product during standard manufacturing operations, making the final assembly and installation simpler and more straightforward.
Data Source
AI summary
A spark plug (20) for being threaded into a cylinder head (28) includes a shell (24) with threads (26) disposed at a predetermined angled relative to the ground electrode (34). The position of the threads (26) relative to the ground electrode (34) places the ground electrode (34) in a predetermined position in the combustion chamber (22) and relative to components of the engine, thus allowing the ground electrode (34) to provide a robust and reliable ignition. The threads (26) are formed by a thread forming apparatus (102) that includes an orientation tool (38) to position the ground electrode (34) relative to a thread forming apparatus (102), allowing the thread forming apparatus (102) to form the threads (26) at the desired angle (α).