Honeycomb Structure with Boundary Reinforcing Regions
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Solution Overview
Problem
Conventional honeycomb structures with multiple cell structures face challenges in maintaining mechanical strength due to deformation near boundary walls, making it difficult to manufacture stable structures with improved exhaust gas purification efficiency.
Innovation Solution
A honeycomb structure design featuring a circumferential reinforcing region, first boundary reinforcing region, and second boundary reinforcing region with varying partition wall thicknesses, along with specific geometric relationships and cell densities, to enhance mechanical strength and reduce deformation near boundary walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a honeycomb structure has two or more cell structures with different cell density separated by a boundary wall, then exhaust gas purification efficiency is improved, but cell shape deformation occurs near the boundary wall causing decrease in mechanical strength
Solution Approach 1:
The partition wall thickness is made non-uniform, with specific regions (first and second boundary reinforcing regions) having greater thickness than other regions. This local variation in quality strengthens the boundary wall areas where cell shape deformation occurs, while maintaining the overall honeycomb structure's ability to provide multiple cell structures for improved exhaust gas purification efficiency.
2Strength
If the partition wall thickness is increased throughout the entire structure to prevent cell shape deformation, then mechanical strength is improved, but the overall structure becomes heavier and more complex
Solution Approach 1:
Instead of uniformly increasing partition wall thickness throughout the entire honeycomb structure, the invention applies increased thickness only to specific boundary reinforcing regions where cell shape deformation occurs. This localized approach provides the necessary mechanical strength while avoiding unnecessary material usage and structural complexity in regions where it is not needed.
Solution Approach 2:
The honeycomb structure is segmented into different regions with different partition wall thickness characteristics. The boundary reinforcing regions are distinguished from other regions by their greater thickness, allowing for targeted reinforcement without affecting the overall structural simplicity of the honeycomb design.
Data Source
AI summary
A pillar-shaped honeycomb structure body of a honeycomb structure includes a circumferential cell structure, a central cell structure and a boundary wall therebetween. On a surface orthogonal to the cells there are a circumferential reinforcing region having the partition wall thicker than a basic partition wall thickness in the circumferential cell structure and existing outside a range of a distance from a centroid of the surface; and at least one of a first boundary reinforcing region having the partition wall thicker than the basic partition wall thickness and existing in a range of a distance from the centroid within a range of the circumferential cell structure and a second boundary reinforcing region having the partition wall thicker than a basic partition wall thickness in the central cell structure and existing outside of a range of a distance from the centroid within a range of the central cell structure.