Gas Generator Filter Positioning via Molded Agent
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Solution Overview
Problem
Conventional gas generators require a support member or positioning portion inside the housing to securely place a cylindrical filter, which complicates assembly and increases costs due to the need for specialized housing design and processing.
Innovation Solution
The gas generator design positions the cylindrical filter outside the inner tube, using positioning jigs during assembly to align and secure the filter without the need for internal support members or convex portions on the diffuser shell, allowing for automated assembly and reduced part costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support member or positioning portion is provided inside the housing to position the cylindrical filter, then the filter can be securely positioned, but the device complexity and manufacturing cost increase due to additional parts and specialized housing design
Solution Approach 1:
The gas generating agent itself serves as the positioning element for the cylindrical filter. The molded article of the gas generating agent is filled in the combustion chamber and comes into contact with the cylindrical filter, using its own volume and shape to position the filter without requiring separate positioning structures. This self-service approach eliminates the need for additional positioning parts while maintaining filter stability.
Solution Approach 2:
The invention changes the functional role of the gas generating agent from merely a chemical reactant to also being a mechanical positioning element. By controlling the volume, shape, and placement of the molded gas generating agent article, it physically supports and positions the cylindrical filter in the combustion chamber, transforming a chemical substance into a structural component.
2Reliability
If a support member or positioning portion is provided inside the housing to position the cylindrical filter, then the filter can be securely positioned, but the manufacturing cost increases due to additional parts and processing
Solution Approach 1:
The invention merges the function of the gas generating agent with the function of the filter positioning structure. Instead of having separate components for gas generation and filter positioning, the gas generating agent's molded article simultaneously performs both functions: generating gas during combustion and providing mechanical support/positioning for the cylindrical filter during assembly and operation.
Solution Approach 2:
The molded article of the gas generating agent serves multiple functions: (1) chemical function of generating gas during combustion, (2) mechanical function of positioning the cylindrical filter, and (3) structural function of filling the combustion chamber volume. This multi-functionality reduces the total number of parts needed and simplifies manufacturing.
3Manufacturing precision
If positioning jigs are used during assembly to align the cylindrical filter, then accurate positioning is achieved, but the assembly time increases due to additional positioning steps
Solution Approach 1:
The gas generating agent is pre-formed into a molded article with a specific shape and volume that is designed to automatically position the cylindrical filter when placed in the combustion chamber. This preliminary preparation of the gas generating agent's geometry eliminates the need for complex positioning jigs during assembly, as the molded article itself provides the positioning function upon insertion.
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 approach simplifies the assembly process, reduces costs by eliminating the need for specialized housing features, and ensures accurate positioning of the cylindrical filter, enhancing the reliability and efficiency of the gas generator operation.
Implementation Method 1
before actuation, a central axis of the cylindrical filter and a central axis of the diffuser shell being positioned to coincide with each other by the presence of the molded article of the gas generating agent
Implementation Method 2
a cylindrical filter (a coolant/filter) for cooling and filtering a high-temperature combustion gas generated by combustion of the gas generating agent
Implementation Method 3
a cylindrical filter (a coolant/filter) for cooling and filtering a high-temperature combustion gas generated by combustion of the gas generating agent
Implementation Method 4
a cylindrical filter (a coolant/filter) for cooling and filtering a high-temperature combustion gas generated by combustion of the gas generating agent
Data Source
AI summary
The present invention provides a gas generator in which no positioning device for a cylindrical filter is needed, and a method of assembling the gas generator.The inside of a combustion chamber is filled with a predetermined amount of a molded article of a gas generating agent in a state in which an outside positioning jig is disposed between a cylindrical filter and a circumferential wall portion of a diffuser shell, and an inside positioning jig is disposed between the cylindrical filter and an inner tube. Upon completion of the filling, the two positioning jigs are removed, and the molded article of the gas generating agent is pressed in by an annular underplate. The cylindrical filter is positioned by this pressing-in.