초록 ▼

An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks. The columnar honeycomb structural body of the

An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks. The columnar honeycomb structural body of the present invention includes a plurality of through holes placed in parallel with one another in the length direction, and wall portion that separates the plurality of through holes from one another and constitutes a circumferential face, wherein the plurality of through holes are composed of a group of large-capacity through holes, with one end thereof being sealed so as to cause the total of areas of cross-section perpendicular to the length direction to become relatively greater, and a group of small-capacity through holes, with the other end thereof being sealed so as to cause the total of areas of the above-mentioned cross-section to become relatively smaller, and the above-mentioned circumferential face of the columnar honeycomb structural body has a chamfered corner portion.

대표청구항 ▼

The invention claimed is: 1. A honeycomb structural body comprising: a columnar structural body having an inlet side and an outlet side, the columnar structural body comprising aluminum titanate and having a plurality of large-capacity through holes and a plurality of small-capacity through holes e

The invention claimed is: 1. A honeycomb structural body comprising: a columnar structural body having an inlet side and an outlet side, the columnar structural body comprising aluminum titanate and having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction of the columnar structural body, the large-capacity and small-capacity through holes being alternately formed in the columnar structural body; and a sealing material comprising aluminum titanate and having a porosity substantially equal to a porosity of the columnar structural body, the sealing material being disposed to seal the large-capacity through holes of the columnar structural body at the outlet side of the columnar structural body and the small-capacity through holes of the columnar structural body at the inlet side of the columnar structural body, wherein the plurality of large-capacity through holes has a total cross-section area which is larger than a total cross-section area of the small-capacity through holes, the columnar structural body has a polygonal shape and chamfered corner portions in a cross section perpendicular to the length direction, and at least one of the plurality of large-capacity through holes and the plurality of small-capacity through holes includes ones adjacent to the chamfered corner portions of the columnar structural body. 2. The honeycomb structural body according to claim 1, wherein the plurality of large-capacity through holes and the plurality of small-capacity through holes have a ratio of the total cross-section areas in a range between 1.55 to 6.00. 3. The honeycomb structural body according to claim 1, wherein the ones adjacent to the chamfered corner portions have chamfered face, and the chamfered corner portions and ones adjacent to the chamfered corner portions have one of a R-chamfered shape and a C-chamfered shape. 4. The honeycomb structural body according to claim 1, wherein at least a half of the ones adjacent to the chamfered corner portions comprises ones of the large-capacity through holes. 5. The honeycomb structural body according to claim 4, wherein the ones adjacent to the chamfered corner portions comprises ones of the large-capacity through holes. 6. The honeycomb structural body according to claim 1, wherein the large-capacity through holes and the small-capacity through holes have a polygonal shape in a cross-section perpendicular to the length direction. 7. The honeycomb structural body according to claim 1, wherein the large-capacity through holes the small-capacity through holes in the columnar structural body form wall portions which make an obtuse angle. 8. The honeycomb structural body according to claim 1, wherein one of the plurality of large-capacity through holes and the plurality of small-capacity through holes has an octagonal shape in a cross-section perpendicular to the length direction and the other one of the plurality of large-capacity through holes and the plurality of small-capacity through holes has a quadrangle or square shape in the cross-section. 9. The honeycomb structural body according to claim 1, wherein the ones adjacent to the chamfered corner portions have a curved shape in a cross-section perpendicular to the length direction. 10. The honeycomb structural body according to claim 1, wherein the large-capacity through holes and the small-capacity through holes are formed such that centers of gravity of adjacent ones of the large-capacity and small-capacity through holes are separated by a same distance, the centers of gravity being found in a cross-section perpendicular to the length direction. 11. A filter for an exhaust gas purifying apparatus for a vehicle, comprising: a honeycomb structural body comprising a columnar structural body having an inlet side and an outlet side, the columnar structural body comprising aluminum titanate and having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction of the columnar structural body, the large-capacity and small-capacity through holes being alternately formed in the columnar structural body; and a sealing material comprising aluminum titanate and having a porosity substantially equal to a porosity of the columnar structural body, the sealing material being disposed to seal the large-capacity through holes of the columnar structural body at the outlet side of the columnar structural body and the small-capacity through holes of the columnar structural body at the inlet side of the columnar structural body, wherein the plurality of large-capacity through holes has a total cross-section area which is larger than a total cross-section area of the small-capacity through holes, the columnar structural body has a polygonal shape and chamfered corner portions in a cross section perpendicular to the length direction, and at least one of the plurality of large-capacity through holes and the plurality of small-capacity through holes includes ones adjacent to the chamfered corner portions of the columnar structural body. 12. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the plurality of large-capacity through holes and the plurality of small-capacity through holes have a ratio of the total cross-section areas in a range between 1.55 to 6.00. 13. The filter for an exhaust gas purifying apparatus according to claim 11, wherein at least a half of the ones adjacent to the chamfered corner portions comprises ones of the large-capacity through holes. 14. The filter for an exhaust gas purifying apparatus according to claim 11, wherein at least a half of the ones adjacent to the chamfered corner portions comprises ones of the large-capacity through holes. 15. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the large-capacity through holes and the small-capacity through holes have a polygonal shape in a cross-section perpendicular to the length direction. 16. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the large-capacity through holes the small-capacity through holes in the columnar structural body form wall portions which make an obtuse angle. 17. The filter for an exhaust gas purifying apparatus according to claim 11, wherein one of the plurality of large-capacity through holes and the plurality of small-capacity through holes has an octagonal shape in a cross-section perpendicular to the length direction and the other one of the plurality of large-capacity through holes and the plurality of small-capacity through holes has a quadrangle or square shape in the cross-section. 18. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the ones adjacent to the chamfered corner portions have a curved shape in a cross-section perpendicular to the length direction. 19. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the large-capacity through holes and the small-capacity through holes are formed such that centers of gravity of adjacent ones of the large-capacity and small-capacity through holes are separated by a same distance, the centers of gravity being found in a cross-section perpendicular to the length direction. 20. The filter for an exhaust gas purifying apparatus according to claim 11, wherein the ones adjacent to the chamfered corner portions have chamfered face, and the chamfered corner portions and ones adjacent to the chamfered corner portions have one of a R-chamfered shape and a C-chamfered shape.