Honeycomb structural body

摘要

A honeycomb structural body has plural cell density sections having a cell density which is changed stepwise in a radial direction. A partition wall is formed between adjacent cell density sections. The cell density sections have a high cell density section having a maximum cell density, excepting an outermost cell density section formed at an outermost side, and a low cell density section having a minimum cell density, excepting an innermost cell density section formed at an innermost side. A relationship of V−Va≧Vb+Vs is satisfied, where V indicates a volume of the honeycomb structural body if the overall honeycomb structural body is composed of the high cell density section, Va indicates a volume of the high cell density section, Vb indicates a volume of the cell density section, and Vs indicates a volume of the boundary wall which separates the low cell density section from the cell density section formed immediately inside of the low cell density section.

主权项

1. A honeycomb structural body as a monolithic body made of cordierite comprising partition walls arranged in a lattice shape and a plurality of cells surrounded by the partition walls,
wherein the honeycomb structural body comprises a plurality of cell density sections having a cell density changed stepwise in a radial direction from a central side to an outer peripheral side in a cross section which is perpendicular to an axial direction, a boundary wall is formed between the cell density sections which are adjacent to each other in order to partition off these cell density sections, the cell density sections comprise a high cell density section having a maximum cell density, excepting an outermost cell density section formed at an outermost side, and a low cell density section having a minimum cell density, excepting an innermost cell density section formed at an innermost side, and the honeycomb structural body satisfies a relationship of V−Va≧Vb+Vs, where reference character V indicates a volume of the honeycomb structural body if the overall honeycomb structural body is composed of the high cell density section only, reference character Va indicates a volume of the high cell density section, reference character Vb indicates a volume of the low cell density section, and reference character Vs indicates a volume of the boundary wall which separates the low cell density section from the cell density section formed immediately inside of the low cell density section.