Honeycomb Structure With Offset Center of Gravity
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Solution Overview
Problem
Conventional honeycomb structures with varying cell densities and shapes around the circumference are prone to deformation, leading to insufficient mechanical strength and crack generation due to uneven load distribution during manufacturing.
Innovation Solution
A honeycomb structure design where the geometric center of gravity is offset from the central cell structure's center of gravity by a distance greater than half the cell pitch of the outermost circumferential cell structure, with a porous boundary wall and continuous or discontinuous partition walls between cell structures, to disperse stress and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cell density of the central portion is made higher to improve exhaust gas purification efficiency, then the purification efficiency is improved, but the cells at the outermost circumference become more prone to deformation under their own weight during manufacturing
Solution Approach 1:
The patent applies asymmetry by intentionally offsetting the center of gravity of the honeycomb structure from the geometric center toward the central cell structure. This asymmetric design creates a balancing effect that counteracts the deformation tendency of the outer circumference cells, allowing the central portion to have higher cell density for improved purification efficiency while preventing manufacturing defects
Solution Approach 2:
The patent implements local quality by creating different cell structures in different regions: the central portion has higher cell density for enhanced purification performance, while the outer circumference maintains appropriate cell spacing to prevent deformation. This spatial differentiation of structural properties allows each region to be optimized for its specific function
2Manufacturing precision
If a receiving base with complementary support surface is used to support the honeycomb formed body during extrusion, then the outer shape deformation is inhibited, but the cells at the outermost circumference still deform due to the weight of the honeycomb formed body
Solution Approach 1:
The patent uses asymmetric center of gravity positioning to counteract the gravitational force acting on the honeycomb formed body during manufacturing. By offsetting the center of gravity toward the central cell structure, the design creates a balancing moment that prevents the outer circumference cells from deforming under their own weight, thereby improving mechanical strength while maintaining outer shape accuracy
3Ease of manufacture
If the honeycomb structure has uniform cell structure throughout to simplify manufacturing, then the manufacturing process is simplified, but the mechanical strength is insufficient due to uneven load distribution
Solution Approach 1:
The patent applies local quality by implementing different cell structures in different regions of the honeycomb. The central portion has higher cell density to handle concentrated loads, while the outer circumference has adjusted cell spacing to distribute peripheral loads. This differentiated design improves mechanical strength by creating appropriate load distribution paths while remaining manufacturable through extrusion processes
Data Source
AI summary
The honeycomb structure includes a pillar-shaped honeycomb structure body having porous partition walls, as to the honeycomb structure body, in a plane perpendicular to a cell extending direction, a cell structure of a central cell structure differs from a cell structure of a circumferential cell structure, and in the plane, a geometric center of gravity of the honeycomb structure body exists at a position which is away from a geometric center of gravity of the central cell structure, and a distance between the respective centers of gravity is larger than a length of a half of a cell pitch of an outermost circumferential cell structure including complete cells formed at an outermost circumference of the honeycomb structure body.