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. An aggregated-type honeycomb structural body comprising: a plurality of honeycomb structural bodies bounded with one another, the honeycomb structural bodies each having a plurality of large-capacity through holes and a plurality of small-capacity through holes extendin
The invention claimed is: 1. An aggregated-type honeycomb structural body comprising: a plurality of honeycomb structural bodies bounded with one another, the honeycomb structural bodies each having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction and having a polygonal shape and a chamfered corner portion in a cross section perpendicular to the length direction, wherein the large-capacity through holes are sealed at one end of the plurality of honeycomb structural bodies, the small-capacity through holes are sealed at the other end of the plurality of honeycomb structural bodies, and the large-capacity through holes have a total cross-section area which is larger than a total cross-section area of the small-capacity through holes. 2. An aggregated-type honeycomb structural body comprising: a plurality of honeycomb structural bodies bounded with one another, the honeycomb structural bodies each having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction and having a polygonal shape and a first chamfered corner portion in a cross section perpendicular to the length direction, wherein the large-capacity through holes are sealed at one end of the plurality of honeycomb structural bodies, the small-capacity through holes are sealed at the other end of the plurality of honeycomb structural bodies, and the large-capacity through holes has a total cross-section area which is larger than a total cross-section area of the small-capacity structural bodies, and the honeycomb structural bodies each have a through hole located adjacent to the first chamfered corner portion, the through hole having in the cross-section a second chamfered corner portion corresponding to the first chamfered corner portion of the respective honeycomb structural body. 3. The aggregated-type honeycomb structural body according to claim 1, wherein the large-capacity through holes and the small-capacity through holes include ones adjacent to the chamfered corner portions, at least a half of the ones adjacent to the chamfered corner portions being ones of the large-capacity through holes. 4. The aggregated-type honeycomb structural body according to claim 3, wherein the ones adjacent to the chamfered corner portions are ones of the large-capacity through holes. 5. The aggregated-type honeycomb structural body according to claim 1, wherein the large-capacity through holes and/or the small-capacity through holes have a polygonal shape in the cross-section. 6. The aggregated-type honeycomb structural body according to claim 1, wherein, in the cross-section, at least one angle formed at a point where a first wall portion, shared by a through hole constituting a group of large-capacity through holes and an adjacent through hole constituting a group of large-capacity through holes, intersects a second wall portion, shared by a through hole constituting a group of the large-capacity through holes and an adjacent through hole constituting a group of the small-capacity through holes, is an obtuse angle. 7. The aggregated-type honeycomb structural body according to claim 1, wherein one group of the large-capacity through holes and the small-capacity through holes has an octagonal shape in the cross-section and the other group of the large-capacity through holes and the small-capacity through holes has a quadrangle or square shape in the cross-section. 8. The aggregated-type honeycomb structural body according to claim 1, wherein in the cross-section, the large-capacity through holes and/or the small-capacity through holes have chamfered corner portions. 9. The agggregated-type honeycomb structural body according to claim 1, wherein a distance between centers of gravity in the cross-section of the nearest large-capacity through holes is same as a distance between centers of gravity in the cross-section of the nearest small-capacity through holes. 10. A filter for an exhaust gas purifying apparatus for a vehicle, comprising: an aggregate-type honeycomb structural body comprising a plurality of honeycomb structural bodies bounded one another, the honeycomb structural bodies each having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction and having a chamfered corner portion in a cross section perpendicular to the length direction, wherein the large-capacity through holes are sealed at one end of the plurality of honeycomb structural bodies, the small-capacity through holes are sealed at the other end of the plurality of honeycomb structural bodies, and the large-capacity through holes have a total cross-section area which is larger than a total cross-section area of the small-capacity through holes. 11. The aggregated-type honeycomb structural body according to claim 2, wherein the large-capacity through holes and the small-capacity through holes include ones adjacent to the first chamfered corner portions, at least a half of the ones adjacent to the first chamfered corner portions being ones of the large-capacity through holes. 12. The aggregated-type honeycomb structural body according to claim 11, wherein the ones adjacent to the first chamfered corner portions are ones of the large-capacity through holes. 13. The aggregated-type honeycomb structural body according to claim 2, wherein the large-capacity through holes and/or the small-capacity through holes have a polygonal shape in the cross-section. 14. The aggregated-type honeycomb structural body according to claim 2, wherein, in the cross-section, at least one angle formed at a point where a first wall portion, shared by a through hole constituting a group of large-capacity through holes and an adjacent through hole constituting a group of large-capacity through holes, intersects a second wall portion, shared by a through hole constituting a group of the large-capacity through holes and an adjacent through hole constituting a group of the small-capacity through holes, is an obtuse angle. 15. The aggregated-type honeycomb structural body according to claim 2, wherein one group of the large-capacity through holes and the small-capacity through holes has an octagonal shape in the cross-section and the other group of the large-capacity through holes and the small-capacity through holes has a quadrangle or square shape in the cross-section. 16. The aggregated-type honeycomb structural body according to claim 1, wherein in the cross-section, the large-capacity through holes and/or the small-capacity through holes have chamfered corner portions. 17. The aggregated-type honeycomb structural body according to claim 2, wherein a distance between centers of gravity in the cross-section of the nearest large-capacity through holes is same as a distance between centers of gravity in the cross-section of the nearest small-capacity through holes. 18. A filter for an exhaust gas purifying apparatus for a vehicle, comprising: an aggregate-type honeycomb structural body comprising a plurality of honeycomb structural bodies bounded with one another, the honeycomb structural bodies each having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction and having a polygonal shape and a first chamfered corner portion in a cross section perpendicular to the length direction, wherein the large-capacity through holes are sealed at one end of the plurality of honeycomb structural bodies, the small-capacity through holes are sealed at the other end of the plurality of honeycomb structural bodies, and the large-capacity through holes have a total cross-section area which is larger than a total cross-section area of the small-capacity through holes, and the honeycomb structural bodies each have a through hole located adjacent to the first chamfered corner portion, the through hole having in the cross-section a second chamfered corner portion corresponding to the first chamfered corner portion of the respective honeycomb structural body. 19. The aggregated-type honeycomb structural body according to claim 1, wherein the chamfered corner portion comprises one of a R-chamfered shape and a C-chamfered shape. 20. The aggregated-type honeycomb structural body according to claim 2, wherein the second chamfered corner portion comprises one of a R-chamfered shape and a C-chamfered shape. 21. The aggregated-type honeycomb structural body according to claim 1, further comprising a sealing material binding the honeycomb structural bodies. 22. The aggregated-type honeycomb structural body according to claim 2, further comprising a sealing material binding the honeycomb structural bodies. 23. The aggregated-type honeycomb structural body according to claim 21, wherein the sealing material comprises at least one binder selected from the group consisting of an inorganic binder and an organic binder. 24. The aggregated-type honeycomb structural body according to claim 22, wherein the sealing material comprises at least one binder selected from the group consisting of an inorganic binder and an organic binder. 25. The aggregated-type honeycomb structural body according to claim 1, wherein the large-capacity and small-capacity through holes are alternately formed in each of the honeycomb structural bodies. 26. The aggregated-type honeycomb structural body according to claim 2, wherein the large-capacity and small-capacity through holes are alternately formed in each of the honeycomb structural bodies.
Berg Morris (Grand Blanc MI) Schaefer Carl F. (Flint MI) Johnston William J. (Birkdale GB2), Ceramic filters for diesel exhaust particulates and methods for making.
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