Holding Sealer With Profiled Surface For Exhaust Gas Purifying Device
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Solution Overview
Problem
Existing exhaust gas purifying devices face challenges with friction and shifting during the press fitting of holding sealers due to high contact area and friction between the sealer and the metallic shell, leading to potential gaps and misalignment.
Innovation Solution
A holding sealer with a sheet member made of inorganic fibers, featuring a profile with projecting and depressed portions that reduce friction by minimizing contact area, where the maximum difference (h) between these features is optimized between 0.4 mm and 9 mm, allowing for easier installation and reduced shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smooth surface holding sealer is used, then the contact area with the metallic shell is large, but this leads to high friction and difficulty in press fitting
Solution Approach 1:
The holding sealer surface is designed with local quality variations through projecting and depressed portions. The depressed portions create low-friction contact zones with the metallic shell, while the projecting portions maintain structural integrity and sealing function. This local differentiation of surface properties reduces overall friction during press fitting while preserving necessary contact areas.
Solution Approach 2:
The surface of the holding sealer incorporates curved depressed portions rather than flat surfaces. These curved surfaces reduce the actual contact area with the metallic shell during press fitting, thereby reducing friction force and easing installation while maintaining sufficient contact for structural support.
2Reliability
If the contact area between holding sealer and metallic shell is increased, then sealing ability is improved, but friction and shifting during installation increase
Solution Approach 1:
The contact surface of the holding sealer is segmented into multiple discrete regions through the pattern of projecting and depressed portions. This segmentation allows the sealer to make contact with the metallic shell at multiple isolated points rather than across a continuous large area, reducing total friction while maintaining sealing effectiveness through distributed contact zones.
Solution Approach 2:
Different regions of the holding sealer surface are given different properties: depressed portions provide low-friction contact areas for easy installation, while projecting portions provide high-contact areas for reliable sealing. This local quality differentiation resolves the contradiction between ease of installation and sealing ability.
3Ease of operation
If a liquid lubricant is applied to reduce friction, then press fitting becomes easier, but the holding sealer may shift or become misaligned
Solution Approach 1:
The holding sealer's surface structure itself provides the friction-reducing function that would otherwise require external lubricants. The depressed portions naturally create low-friction zones during press fitting, eliminating the need for liquid lubricants and preventing the associated alignment and shifting problems while still enabling easy installation.
Data Source
AI summary
A holding sealer for an exhaust gas purifying device includes a sheet member including inorganic fibers and having a first surface and a second surface substantially facing each other and perpendicular to a direction of thickness of the sheet member. At least one of the first and second surfaces has a profile including projecting portions and depressed portions. The projecting and depressed portions of the profile have a maximum difference, h. The h satisfies about 0.4 mm≦h≦9 mm.