Gas Generator Sealing Structure Without Precision Holder Cutting
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Solution Overview
Problem
Existing gas generators require highly accurate cutting of the holder to secure sealing performance, leading to increased manufacturing costs.
Innovation Solution
A gas generator design featuring a holder with an annular collar portion and a resin molded portion that uses a sealant to sandwich a flange portion between an annular groove and collar, ensuring long-term sealing without the need for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If various projections and recesses such as a standing wall portion and a groove are provided at the holder surface to secure sealing performance, then sealing performance is improved, but highly accurate cutting of the holder is required which increases manufacturing cost
Solution Approach 1:
A resin molded portion is introduced as an intermediary sealing element between the holder and the cup. The resin material fills the space between these components and provides sealing functionality, eliminating the need for complex projections and recesses on the holder surface. This mediator approach resolves the contradiction by achieving reliable sealing through a simpler, more cost-effective means.
Solution Approach 2:
The sealing mechanism is changed from mechanical interlocking (projections and recesses requiring precise cutting) to material-based sealing (resin molded portion). By changing the sealing parameter from geometric precision to material properties, the invention achieves both good sealing performance and ease of manufacture.
2Manufacturing precision
If highly accurate cutting of the holder is performed to secure sealing performance, then sealing performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The resin molded portion serves as a mediator that compensates for variations in holder cutting precision. Instead of requiring highly precise cutting, the resin material adapts to the holder surface and provides consistent sealing, thereby reducing both manufacturing precision requirements and device complexity.
Solution Approach 2:
The invention changes the critical sealing parameter from holder geometric precision to resin material properties. This parameter transformation allows for simpler holder manufacturing while maintaining sealing effectiveness through the compliant and adaptive nature of the resin material.
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 provides reliable sealing performance over time while reducing manufacturing costs by eliminating the need for complex holder shaping.
Implementation Method 1
a sealant having been applied to inside of the annular groove
Implementation Method 2
a gas generating agent that generates gas by burning
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A gas generator (1) includes a holder (10) made of metal, an igniter assembly (2) including an igniter (20) and a resin molded portion (30), a cup (40), and a gas generating agent (50). The cup (40) includes a flange portion (43), and the igniter assembly (2) is provided with an annular groove where the flange portion (43) is received. The annular groove has an inner wall surface defined by an outer circumferential surface of a first cover portion (31) of the resin molded portion, has a bottom surface defined by a first end surface (10a) of the holder (10), and has an outer wall surface defined by an inner circumferential surface of an annular collar portion (13) provided in the holder (10). As the annular collar portion (13) is bent inward, the cup (40) is assembled to the holder (10) with a boundary between the first end surface (10a) of the holder (10) and the outer circumferential surface of the first cover portion (31) being covered with a sealant (60) applied to the inside of the annular groove.