Honeycomb structure

Abstract

There is disclosed a honeycomb structure which solves a problem of antinomy that it is difficult to satisfy both of a high temperature rise performance and a high thermal capacity at the same time and which is disposed at a previous stage of a filter for trapping particulate matters (PM) discharged from a diesel engine so that regeneration of the PM trapped by the filter can smoothly be completed and an exhaust gas can efficiently be purified. In a honeycomb structure in which a plurality of cells arranged in parallel with one another to communicate between two end surfaces of the honeycomb structure are formed by a plurality of partition walls, the plurality of partition walls are made of a ceramic, and constituted of partition walls having two or more types of thicknesses.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing one embodiment of a honeycomb structure according to the present invention; and

FIG. 2 is an explanatory view showing one end surface of the honeycomb structure shown in FIG. 1.

Claims

1. A honeycomb structure comprising: a plurality of partition walls, anda plurality of cells arranged in parallel with one another to communicate between two end surfaces of the honeycomb structure being formed by the plurality of partition walls,wherein the plurality of partition walls are made of a ceramic, and have two or more types of thicknesses.

2. The honeycomb structure according to claim 1, wherein in a case where the partition walls are cut in a direction vertical to central axes of the cells, the thicknesses of the partition walls are in a constant pattern.

3. The honeycomb structure according to claim 1, wherein the partition walls are constituted of two types of partition walls having different thicknesses; and two types of partition walls having the different thicknesses are alternately arranged.

4. The honeycomb structure according to claim 1, wherein among the plurality of partition walls, a value of a ratio of the thickness of the partition wall having the maximum thickness to that of the partition wall having the minimum thickness (the thickness of the partition wall having the maximum thickness/the thickness of the partition wall having the minimum thickness) is 1.2 or more and 4.0 or less.

5. The honeycomb structure according to claim 1, wherein the partition walls are made of at least one ceramic selected from the group consisting of cordierite, alumina, mullite and lithium aluminosilicate (LAS).

6. A honeycomb structure coated with a catalyst, constituted by coating the honeycomb structure according to claim 1 with the catalyst.

7. A purification device comprising: a filter which traps particulate matters, andthe honeycomb structure according to claim 1 upstream the filter.

8. A purification device comprising: a filter which traps particulate matters, andthe honeycomb structure according to claim 6 upstream the filter.