A honeycomb filter includes a plurality of cells and porous cell walls. The plurality of cells defines exhaust gas passages. The plurality of cells includes exhaust gas introduction cells and exhaust gas emission cells. Each of the exhaust gas emission cells is adjacently surrounded fully by the exh
A honeycomb filter includes a plurality of cells and porous cell walls. The plurality of cells defines exhaust gas passages. The plurality of cells includes exhaust gas introduction cells and exhaust gas emission cells. Each of the exhaust gas emission cells is adjacently surrounded fully by the exhaust gas introduction cells across the porous cell walls. The exhaust gas introduction cells include first exhaust gas introduction cells and second exhaust gas introduction cells. A cross-sectional area of each of the exhaust gas emission cells in a cross section perpendicular to a longitudinal direction of the plurality of cells is equal to or larger than a cross-sectional area of each of the second exhaust gas introduction cells in the cross section. The exhaust gas introduction cells and the exhaust gas emission cells have one of a first structure and a second structure in the cross section.
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1. A honeycomb filter comprising: a plurality of cells defining exhaust gas passages, the plurality of cells including exhaust gas introduction cells and exhaust gas emission cells, the exhaust gas introduction cells each having an open end at an exhaust gas inlet side and a plugged end at an exhaus
1. A honeycomb filter comprising: a plurality of cells defining exhaust gas passages, the plurality of cells including exhaust gas introduction cells and exhaust gas emission cells, the exhaust gas introduction cells each having an open end at an exhaust gas inlet side and a plugged end at an exhaust gas outlet side, the exhaust gas emission cells each having an open end at the exhaust gas outlet side and a plugged end at the exhaust gas inlet side;porous cell walls defining the plurality of cells;the exhaust gas introduction cells and the exhaust gas emission cells each having a uniform cross-sectional shape throughout from the exhaust gas inlet side to the exhaust gas outlet side excluding a plugged portion in a cross section perpendicular to a longitudinal direction of the plurality of cells;each of the exhaust gas emission cells being adjacently surrounded fully by the exhaust gas introduction cells across the porous cell walls, the exhaust gas introduction cells including first exhaust gas introduction cells and second exhaust gas introduction cells each having a cross-sectional area larger than a cross-sectional area of each of the first exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells;a cross-sectional area of each of the exhaust gas emission cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is equal to or larger than the cross-sectional area of each of the second exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells; andthe exhaust gas introduction cells and the exhaust gas emission cells having, in the cross section perpendicular to the longitudinal direction of the plurality of cells, one of a first structure such that the exhaust gas introduction cells and the exhaust gas emission cells have a polygonal shape, and a first side facing one of the exhaust gas emission cells among sides forming a cross-sectional shape of each of the first exhaust gas introduction cells is longer than a second side facing one of the exhaust gas emission cells among sides forming a cross-sectional shape of each of the second exhaust gas introduction cells, orthe exhaust gas introduction cells and the exhaust gas emission cells have the polygonal shape, one of the sides forming the cross-sectional shape of each of the first exhaust gas introduction cells faces one of the exhaust gas emission cells, and none of the sides forming the cross-sectional shape of each of the second exhaust gas introduction cells faces the exhaust gas emission cells, anda second structure such that the exhaust gas introduction cells and the exhaust gas emission cells are formed by curved lines,the porous cell walls include first porous cell walls separating the first exhaust gas introduction cells and the exhaust gas emission cells, andsecond porous cell walls separating the second exhaust gas introduction cells and the exhaust gas emission cells, andthe first porous cell walls are thinner than the second porous cell walls. 2. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells have the polygonal shape, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the second side has a length that is not more than about 0.8 times a length of the first side. 3. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells are octagonal, the first exhaust gas introduction cells are square, and the second exhaust gas introduction cells are octagonal. 4. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to the cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the first exhaust gas introduction cells is about 20 to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 5. The honeycomb filter according to claim 3, wherein the porous cell walls separating the plurality of cells have a uniform thickness throughout the porous cell walls. 6. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells each have an octagonal cross section, the first exhaust gas introduction cells each have a square cross section, and the second exhaust gas introduction cells each have an octagonal cross section,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional shape of each of the second exhaust gas introduction cells is congruent with the cross-sectional shape of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are arranged in a manner that the exhaust gas emission cells are each surrounded by four cells of the first exhaust gas introduction cells and four cells of the second exhaust gas introduction cells across the porous cell walls, the four cells of the first exhaust gas introduction cells and the four cells of the second exhaust gas introduction cells being alternately arranged,provided that hypothetical segments connecting centroids of octagonal cross sections of the four cells of the second exhaust gas introduction cells surrounding a reference exhaust gas emission cell of the exhaust gas emission cells are drawn, an intersection of two hypothetical segments intersecting the reference exhaust gas emission cell coincides with a centroid of an octagonal cross section of the reference exhaust gas emission cell, andfour hypothetical segments that do not intersect the reference exhaust gas emission cell form a square, and midpoints of respective sides of the square coincide with centroids of square cross sections of the four cells of the first exhaust gas introduction cells surrounding the reference exhaust gas emission cell,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the first exhaust gas introduction cells across a first cell wall among sides forming the cross-sectional shape of the reference exhaust gas emission cell is parallel to a side facing the reference exhaust gas emission cell across the first cell wall among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a second cell wall among the sides forming the cross-sectional shape of the reference exhaust gas emission cell is parallel to a side facing the reference exhaust gas emission cell across the second cell wall among sides forming the cross-sectional shape of one of the second exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a third cell wall among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells is parallel to a side facing one of the first exhaust gas introduction cells across the third cell wall among sides forming the cross-sectional shape of one of the second exhaust gas introduction cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, distances between parallel sides are the same in any pair. 7. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells each have a square cross section. 8. The honeycomb filter according to claim 7, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to the cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the first exhaust gas introduction cells is about 20 to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 9. The honeycomb filter according to claim 7, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells each have a square cross section, the first exhaust gas introduction cells each have a square cross section, and the second exhaust gas introduction cells each have a square cross section,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional shape of each of the second exhaust gas introduction cells is congruent with the cross-sectional shape of each of the exhaust gas emission cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are arranged in a manner that the exhaust gas emission cells are each surrounded by four cells of the first exhaust gas introduction cells and four cells of the second exhaust gas introduction cells across the porous cell walls, the four cells of the first exhaust gas introduction cells and the four cells of the second exhaust gas introduction cells being alternately arranged,provided that hypothetical segments connecting centroids of square cross sections of the four cells of the second exhaust gas introduction cells surrounding a reference exhaust gas emission cell of the exhaust gas emission cells are drawn, an intersection of two hypothetical segments intersecting the reference exhaust gas emission cell coincides with a centroid of a square cross section of the reference exhaust gas emission cell, andfour hypothetical segments that do not intersect the reference exhaust gas emission cell form a square, and midpoints of respective sides of the square coincides with centroids of square cross sections of the four cells of the first exhaust gas introduction cells surrounding the reference exhaust gas emission cell,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the first exhaust gas introduction cells across a first cell wall among sides forming the cross-sectional shape of the reference exhaust gas emission cell is parallel to a side facing the reference exhaust gas emission cell across the first cell wall among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a second cell wall among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells is parallel to a side facing one of the first exhaust gas introduction cells across the second cell wall among sides forming the cross-sectional shape of one of the second exhaust gas introduction cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, distances between parallel sides are the same in any pair. 10. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, vertex portions of the polygonal shape are roundly chamfered. 11. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are point-symmetrical polygons each having not more than eight sides. 12. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells are formed by curved lines, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a thickness of the first porous cell walls is about 40 to about 75% of a thickness of the second porous cell walls. 13. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are all circular. 14. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells and the second exhaust gas introduction cells each have a convex square cross section formed by four outwardly curved lines, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the first exhaust gas introduction cells each have a concave square cross section formed by four inwardly curved lines. 15. The honeycomb filter according to claim 12, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to the cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the first exhaust gas introduction cells is about 20 to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 16. The honeycomb filter according to claim 1, wherein the exhaust gas introduction cells include only the first exhaust gas introduction cells and the second exhaust gas introduction cells as a cell defining an exhaust gas passage. 17. The honeycomb filter according to claim 1, wherein the honeycomb filter comprises a plurality of honeycomb fired bodies,wherein each of the plurality of honeycomb fired bodies has the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells,wherein each of the plurality of honeycomb fired bodies has an outer wall on an outer periphery of each of the plurality of honeycomb fired bodies, andwherein the plurality of honeycomb fired bodies are combined with one another via adhesive layers between the plurality of honeycomb fired bodies. 18. The honeycomb filter according to claim 1, wherein the honeycomb filter comprises a single honeycomb fired body,wherein the single honeycomb fired body includes the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells, andwherein the single honeycomb fired body has an outer wall on the outer periphery of the single honeycomb fired body. 19. The honeycomb filter according to claim 17, wherein at least one of the plurality of honeycomb fired bodies include one of silicon carbide and silicon-containing silicon carbide. 20. The honeycomb filter according to claim 18, wherein the single honeycomb fired body includes cordierite or aluminum titanate. 21. The honeycomb filter according to claim 1, wherein the porous cell walls have a thickness of about 0.10 to about 0.46 mm. 22. The honeycomb filter according to claim 1, wherein the porous cell walls have a porosity of about 40 to about 65%. 23. The honeycomb filter according to claim 1, wherein the porous cell walls have pores having an average pore diameter of about 8 to about 25 μm. 24. The honeycomb filter according to claim 1, wherein the honeycomb filter has a peripheral coat layer formed on a periphery of the honeycomb filter. 25. The honeycomb filter according to claim 1, wherein, in the cross-sectional shape perpendicular to the longitudinal direction of the plurality of cells forming the honeycomb filter, the first exhaust gas introduction cells, the second exhaust gas introduction cells, and the exhaust gas emission cells each have a uniform cross-sectional shape throughout from the exhaust gas inlet side to the exhaust gas outlet side excluding the plugged portion,wherein, in the cross-sectional shape perpendicular to the longitudinal direction of the plurality of cells forming the honeycomb filter, the cross-sectional shape of each of the first exhaust gas introduction cells is different from the cross-sectional shape of each of the second exhaust gas introduction cells, andwherein, in the cross-sectional shape perpendicular to the longitudinal direction of the plurality of cells forming the honeycomb filter, the cross-sectional shape of each of the exhaust gas emission cells is different from the cross-sectional shape of each of the first exhaust gas introduction cells. 26. The honeycomb filter according to claim 1, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a cell unit is two-dimensionally repeated, where the first exhaust gas introduction cells and the second exhaust gas introduction cells surrounding each of the exhaust gas emission cells in the cell unit are shared between adjacent cell units,wherein, the cell unit has a cell structure such that each of the exhaust gas emission cells is adjacently surrounded fully by the exhaust gas introduction cells across the porous cell walls,the exhaust gas introduction cells includes the first exhaust gas introduction cells and the second exhaust gas introduction cells having the cross-sectional area larger than the cross-sectional area of the first exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells, andthe cross-sectional area of each of the exhaust gas emission cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is equal to or larger than the cross-sectional area of each of the second exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells have one of the first structure and the second structure.
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이 특허에 인용된 특허 (23)
Beall, Douglas M.; Frost, Rodney I.; Miao, Weiguo, Asymmetric honeycomb wall-flow filter having improved structural strength.
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