| 主权项 |
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; and the 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. |
