Gas Generator Holder Assembly With Resin Compression Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing cylinder type gas generators have high manufacturing costs and weight due to complex holders and numerous components, which complicate assembly and increase costs.
Innovation Solution
A gas generator design that includes a housing main body, a holder assembly with a metal holder portion and a resin connector portion, and a coil spring to fix the gas generating agent, reducing the number of components and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex holder assembly with multiple components is used to secure the igniter and connector, then the structural strength and reliability are improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The holder assembly is integrated as a single unit that combines multiple functions: securing the igniter, supporting the connector, and providing structural reinforcement at the housing opening. This merging of functions into one component reduces the total number of parts while maintaining the necessary structural integrity and reliability.
2Ease of manufacture
If multiple separate components are used in the holder assembly, then the ease of manufacture and assembly are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The holder assembly is designed as an integrated component that can be manufactured as a single piece, eliminating the need to assemble multiple separate parts. This reduces assembly steps and manufacturing complexity while maintaining the functional benefits of having distinct regions for igniter mounting and connector support.
3Strength
If metal components are used throughout the holder assembly, then the strength and durability are improved, but the weight increases
Solution Approach 1:
The holder assembly utilizes a combination of metal and resin materials, strategically assigning metal to areas requiring high strength (such as the igniter mounting portion) and resin to areas where lower strength is acceptable (such as the connector support portion). This composite approach reduces overall weight while maintaining necessary structural strength.
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 achieves a reduction in manufacturing cost and weight by simplifying the holder assembly and reducing the number of components, while maintaining good gas output characteristics.
Implementation Method 1
a coil spring that biases the gas generating agent toward the other end of the housing is provided between the one end of the housing to which the igniter is assembled and the gas generating agent
Implementation Method 2
an igniter therein being ignited in response to power feed caused by a control unit at the time of collision of a vehicle to thereby burn a gas generating agent with flame caused by the igniter and instantaneously generate a large amount of gas
Implementation Method 3
a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter radially inward, so that the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion to seal a gap
Data Source
AI summary
A gas generator includes a housing main body made of metal, a holder assembly, and an igniter. The holder assembly includes a holder portion made of metal and a connector portion made of resin. The holder portion includes a first barrel portion and an annular projection. The connector portion includes a second barrel portion and a cylindrical portion. The cylindrical portion is inserted in the housing main body and externally attached to the first barrel portion. As a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter, the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion so as to seal a gap between the housing main body and the first barrel portion.