Igniter Assembly Resin Collar Seal for Re-Attachable Airtight Fixing
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Solution Overview
Problem
The existing igniter assemblies face challenges in maintaining sealing properties due to increased parts and complexity in assembly, with protrusions on metal igniter collars deforming and making re-attachment difficult, leading to compromised sealing when the resin portion is recessed.
Innovation Solution
An igniter assembly with a resin holding portion featuring protrusions that are press-attached to a metal fixing portion, allowing for improved sealing without additional parts and facilitating re-attachment by maintaining the protrusions' integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal member is used to improve sealing property, then sealing property improves, but number of parts increases
Solution Approach 1:
The sealing function is merged with the holding portion by forming the protrusion portion directly on the holding portion made of resin. This integration eliminates the need for separate seal members while maintaining the sealing function, thereby reducing the total number of parts in the igniter assembly.
2Reliability
If protrusion is bitten into resin portion, then sealing property improves, but re-attachment becomes difficult
Solution Approach 1:
Instead of forming the protrusion on the metal igniter collar that bites into the resin (traditional approach), the invention inverts the approach by forming the protrusion on the resin holding portion itself. This inversion allows the protrusion to be press-attached to the fixing portion without permanently deforming or damaging the resin, enabling re-attachment while maintaining sealing property.
3Reliability
If alignment accuracy is increased, then sealing property improves, but assembly difficulty increases
Solution Approach 1:
The invention changes the material parameter of the protrusion from metal to resin, which fundamentally alters the interaction mechanism. The resin protrusion can be press-attached to the metal fixing portion with tolerance for misalignment, as the resin material allows for deformation and conformal contact. This parameter change reduces the required alignment accuracy and simplifies the assembly process.
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 configuration enhances sealing properties between the igniter and igniter collar, preventing moisture ingress and allowing for easy re-attachment without degrading the sealing performance, thus simplifying the assembly process while maintaining air-tightness.
Implementation Method 1
the protrusion portion is press-attached at the fixing portion in a state where the holding portion is fixed to the fixing portion
Data Source
AI summary
An igniter assembly includes an igniter of an electric ignition type including: an ignition portion including an igniting agent; a holding portion made of resin and covering at least a portion of the ignition portion and holding the ignition portion; and an electro-conductive pin configured to energize the ignition portion, and also includes an igniter collar made of metal and to which the igniter is attached. The igniter collar includes a fixing portion surrounding the holding portion to fix it. The holding portion includes a protrusion portion formed continuously around a periphery of the holding portion and formed integrally with the holding portion. The protrusion portion is press-attached to the fixing portion in a state where the holding portion is fixed to the fixing portion.