Ignition Coil Cover Fixation via Sealing Resin
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Solution Overview
Problem
Existing ignition coils for internal combustion engines face challenges in preventing water infiltration into the plug hole while maintaining effective ventilation, requiring complex production processes and potential gaps in the cover fixation, which can lead to inefficiencies in water prevention and ventilation.
Innovation Solution
The design includes a column section with a ventilation opening, a notched section, and a sealing section with a filler resin that fixes the cover to the case section, preventing filler resin leakage and ensuring secure fixation without the need for separate adhesion or welding, thus simplifying production and enhancing water prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a space is formed in an upper section within a connector case with a through-hole and groove, then ventilation is enabled, but variations in gap formation cause inconsistent water prevention and ventilation
Solution Approach 1:
The cover is designed with a flexible sealing rubber that can adapt to variations in the gap between the cover and connector case section. The sealing rubber's elasticity allows it to maintain effective sealing and ventilation functionality even when gap dimensions vary during manufacturing, eliminating the need for precise gap control.
2Strength
If a cover is separately fixed to the connector case section by adhesion or welding, then structural integrity is achieved, but production processes become numerous and costly
Solution Approach 1:
The sealing rubber is integrated directly into the cover structure, combining the sealing function and cover structure into a single component. This eliminates the need for separate adhesion or welding processes to fix the cover to the connector case section, simplifying production while maintaining structural integrity and water prevention.
Data Source
AI summary
In an ignition coil for an internal combustion engine, a column section and a notched section are provided in a side wall section of a case section of the ignition coil. A ventilation opening is formed in an up/down direction in the column section. The ventilation opening communicates with a ventilation passage formed between a sealing rubber and the case section and is open in an upper end section. A cover surrounding the column section and covering the upper end section is provided in the side wall section. A sealing section sealing the notched section is provided in the cover. The ignition coil has a filler resin that fills a space within the case section being in continuous contact with the sealing section and the side wall section and fixing the cover to the side wall section.