Honeycomb Structure with Variable Partition Wall Thickness
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Solution Overview
Problem
Honeycomb structures used in diesel particulate filters have low isostatic strength due to their heterogeneous cell structure, which affects their ability to trap particulate matters effectively and withstand operational pressures.
Innovation Solution
A honeycomb structure design with alternately disposed first and second cells, where the thickness of the partition wall in the outer peripheral section is 1.1 to 3.0 times the thickness in the center section, enhancing isostatic strength, and a bonded type honeycomb structure formed by bonding multiple honeycomb structures with convex and concave outer peripheral walls to increase contact area and bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cell structure is made heterogeneous to increase trapped particulate matters, then the quantity of trapped particulate matters increases, but the isostatic strength decreases
Solution Approach 1:
The partition wall thickness is varied locally: thicker in the outer peripheral section (1.1 to 3.0 times thicker than center section) to enhance isostatic strength, and thinner in the center section to maintain large cell areas for particle trapping. This local differentiation resolves the contradiction between strength and particle trapping capacity.
2Strength
If the partition wall thickness is increased to enhance isostatic strength, then the isostatic strength increases, but the cell area decreases
Solution Approach 1:
The partition wall thickness is differentiated by location: the outer peripheral section has increased thickness (1.1 to 3.0 times the center section thickness) to provide structural strength, while the center section maintains thinner walls to preserve large cell areas for effective particle trapping and exhaust flow.
3Strength
If multiple honeycomb structures are bonded together to increase contact area, then the bonding strength increases, but the device complexity increases
Solution Approach 1:
The outer peripheral walls feature asymmetric convex and concave portions that interlock when honeycomb structures are bonded together. This asymmetric design increases bonding contact area and strength while maintaining relatively simple manufacturing processes and assembly procedures.
Data Source
AI summary
A honeycomb structure includes a porous partition wall defining a plurality of cells serving as fluid passages, an outer peripheral wall located at the outermost periphery, a first cell having one end opened and the end plugged, and a second cell having the one end plugged and the other end opened. The first cells and the second cells are disposed alternately, and the area of the first cells is larger than that of the second cells in a cross section perpendicular to a center axis. The thickness of the partition wall that forms at least one cell from the outermost periphery in the outer peripheral section is 1.1 to 3.0 times the thickness of the partition wall in the center section.