Exhaust Gas Purifier Radial Pipe Fitting
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Solution Overview
Problem
Conventional exhaust gas purifying devices for internal combustion engines are oversized due to a long axial length from the flow channel pipe to the lid member, which increases the device size.
Innovation Solution
The exhaust gas purifying device features a cylindrical shell with shell-side and lid-side fitting grooves that securely hold the flow channel pipe between them, reducing the axial length by using bent-back portions and through holes, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow channel pipe is inserted through the cylindrical shell from the radial direction, then the exhaust gas purification function is achieved, but the axial length from the flow channel pipe to the lid member becomes long, increasing the device size
Solution Approach 1:
The flow channel pipe is nested within the fitting grooves formed by bent-back portions of the cylindrical shell and lid member. The pipe is positioned radially inward, with the bent-back portions wrapping around it, creating a compact nested structure that reduces axial length while maintaining functional integrity
Solution Approach 2:
The design transitions from a conventional linear axial arrangement to a radial positioning system. The flow channel pipe is connected radially to the cylindrical shell, and the bent-back portions create a three-dimensional fitting structure that utilizes radial and circumferential dimensions to achieve compactness in the axial direction
2Length of stationary object
If the cylindrical shell and lid member are designed with bent-back portions to hold the flow channel pipe, then the device size is reduced, but the manufacturing complexity increases
Solution Approach 1:
The fitting structure is segmented into distinct components: the cylindrical shell with its own bent-back portions, the lid member with separate bent-back portions, and the flow channel pipe. This segmentation allows each component to be manufactured and formed independently, then assembled together, reducing overall manufacturing complexity
Solution Approach 2:
The design uses parameter changes in the form of bent-back portions with specific geometries and positions. By optimizing the shape, depth, and location of these bent-back features, the structure achieves compactness while remaining manufacturable through standard forming and bending processes
Data Source
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AI summary
An exhaust gas purifying device includes a cylindrical shell, a flow channel pipe, and a lid member. The pipe is connected to the shell along a radial direction of the shell. The shell is a member that is formed in a cylindrical shape having a pair of open ends, and in which exhaust gases flow. The shell has at least one shell-side fitting groove that is formed at one of the ends, and in which the pipe is fittable. The lid member is a member that closes the one of the pair of ends of the shell, and has at least one lid-side fitting groove that is formed at a position facing the at least one shell-side fitting groove, and in which the pipe is fittable. The at least one shell-side fitting groove and the at least one lid-side fitting groove fit the pipe therein by holding the pipe therebetween.