Spark Plug Magnetic Noise Suppression via Conductive Sealing
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Solution Overview
Problem
Existing spark plugs do not effectively suppress electromagnetic noise using magnetic substances, and there is a lack of sufficient study on this suppression method.
Innovation Solution
A spark plug design featuring a magnetic substance structure with a conductor, positioned away from a resistor, and utilizing conductive sealing portions to stabilize electrical contacts and reduce heat generation, thereby effectively suppressing electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a magnetic substance is provided in the through hole of the insulator to suppress electromagnetic noise, then electromagnetic noise suppression is improved, but electrical contact failure occurs at both ends of the magnetic substance structure
Solution Approach 1:
Conductive sealing portions are introduced as intermediary elements between the magnetic substance structure and the electrodes. These sealing portions ensure reliable electrical contact while allowing the magnetic substance to function for noise suppression. The conductive sealing portions act as mediators that bridge the connection between components without compromising either the electrical contact or the magnetic noise suppression function.
Solution Approach 2:
The connection portion is divided into multiple segments including the magnetic substance structure, conductive sealing portions, and resistor, which are arranged in a specific sequence within the through hole. This segmentation allows each component to perform its specific function independently - the magnetic substance for noise suppression, the sealing portions for reliable contact, and the resistor for electrical resistance - thereby resolving the contradiction between noise suppression and contact reliability.
2Object-affected harmful factors
If a resistor is provided in the through hole to suppress electromagnetic noise, then noise suppression is improved, but heat generation occurs leading to potential failures
Solution Approach 1:
The magnetic substance structure serves as an intermediary element that provides an alternative path for electromagnetic noise suppression without relying solely on the resistor. By introducing this additional noise suppression mechanism, the dependence on the resistor is reduced, thereby decreasing heat generation while maintaining effective noise suppression.
3Object-affected harmful factors
If the magnetic substance structure is disposed away from the resistor, then electromagnetic noise suppression is improved, but the structure complexity increases
Solution Approach 1:
The connection portion is designed as a multi-functional assembly that integrates the magnetic substance structure, conductive sealing portions, and resistor within the same through hole space. This universal design allows the connection portion to simultaneously provide electrical connection, noise suppression, and reliable contact functions, thereby reducing overall device complexity despite the increased arrangement of components.
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 suppresses electromagnetic noise and prevents electrical contact failures, maintaining stable resistance and improving durability against heat-induced failures.
Implementation Method 1
a magnetic substance structure including a magnetic substance and a conductor and being disposed on a leading end side or a rear end side of the resistor while being positioned away from the resistor
Implementation Method 2
the occurrence of electromagnetic noise can be suppressed by a magnetic substance
Implementation Method 3
a first conductive sealing portion that is disposed on a leading end side of the first member and is in contact with the first member; a second conductive sealing portion that is disposed between the first member and the second member and is in contact with the first member and the second member
Implementation Method 4
the connection portion includes: a resistor
Data Source
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AI summary
A connection portion connecting a center electrode and a terminal metal fixture together in a through hole of the insulator includes a resistor and a magnetic substance structure including a magnetic substance and a conductor and being disposed on a leading end side or a rear end side of the resistor while being positioned away from the resistor. Among the resistor and the magnetic substance structure, a member disposed on a leading end side is defined as a first member and a member disposed on a rear end side is defined as a second member. The connection portion further includes a first conductive sealing portion, a second conductive sealing portion and a third conductive sealing portion. The first conductive sealing portion is disposed on a leading end side of the first member and is in contact with the first member. The second conductive sealing portion is disposed between the first member and the second member and is in contact with the first member and the second member. The third conductive sealing portion is disposed on a rear end side of the second member and is in contact with the second member. Here, the resistor and the sealing portion may be omitted, and connection portion may include the magnetic substance structure including the magnetic substance and the conductor.