Gas Generator Holder Assembly to Prevent Connector Wobble
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Solution Overview
Problem
Cylinder type gas generators face issues with wobbling in the connector portion, leading to potential erroneous operations and defective power feed due to unintended cancellation of short-circuiting and electrical conduction, while also being heavy and costly.
Innovation Solution
A gas generator design featuring a holder assembly with a metal housing, a metal holder portion, and a resin connector portion, utilizing projections and recesses or tilted projections for secure fixation in both axial and circumferential directions, reducing wobbling and ensuring stable operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a holder is made of metal with complicated shape to achieve strength and secure connection, then reliability and strength are improved, but weight and manufacturing cost increase
Solution Approach 1:
The holder is divided into two separate components: a metal holder body that provides structural strength and a resin connector portion that provides electrical connection functionality. This segmentation allows each component to be optimized for its specific function, reducing the overall weight while maintaining strength requirements.
Solution Approach 2:
The holder assembly combines metal and resin materials to achieve both mechanical strength and electrical insulation properties. The metal holder body provides the necessary strength to withstand internal pressure, while the resin connector portion provides electrical connection and insulation, eliminating the need for a completely metal holder.
2Reliability
If a holder is made of metal with complicated shape to achieve secure connection, then connection reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
By separating the holder into a metal holder body and a resin connector portion, each component can be manufactured with simpler processes and lower precision requirements, while the assembly provides the necessary connection reliability.
Solution Approach 2:
The resin connector portion acts as an intermediary component that bridges the metal holder body and the electrical connector, providing both mechanical attachment and electrical connection functions, thereby simplifying the overall manufacturing process.
3Weight of moving object
If the connector portion is made of resin to reduce weight and cost, then weight and manufacturing cost are reduced, but wobbling and connection stability deteriorate
Solution Approach 1:
The connector portion integrates multiple functions into a single component: electrical connection, mechanical attachment to the holder body, and positioning within the housing. This merging ensures that the resin connector maintains stability despite its lighter weight.
Solution Approach 2:
The connector portion is designed with localized features such as locking portions and receiving structures that provide stability and prevent wobbling at critical locations, while the overall component remains lightweight due to its 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 achieves stable operations, reduces manufacturing cost, and decreases weight by immobilizing the connector portion effectively, addressing the issues of wobbling and weight in existing gas generators.
Implementation Method 1
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
Data Source
AI summary
A gas generator includes a housing main body, a holder assembly, and an igniter. The holder assembly includes a metallic holder portion and a connector portion made of resin. The holder portion includes a first barrel portion in a cylindrical shape provided with a first end surface provided with a recess, and the connector portion includes a second barrel portion in a cylindrical shape provided with a second end surface provided with a projection and a locking portion that projects toward an inner circumferential surface of the housing main body provided with a step portion. In an axial direction, the projection and the recess abut on each other and the locking portion and the step portion abut on each other, and in a circumferential direction, the projection and the recess abut on each other, so that the connector portion is immovably fixed in the axial direction and the circumferential direction.