| 主权项 |
1. A catalytic converter comprising:
an outer tube that is connected to an exhaust duct through which exhaust gas flows, the exhaust duct including an upstream-side exhaust duct and a downstream-side exhaust duct with respect to a direction of an exhaust-gas flow, the outer tube including a cylindrical portion, an upstream-side cone portion connected to the upstream-side exhaust duct, and a downstream-side cone portion connected to the downstream-side exhaust duct, the upstream-side cone portion extending from an upstream-side end of the cylindrical portion in such a manner that a cross-section diameter of the upstream-side cone portion decreases toward the upstream-side exhaust duct, the downstream-side cone portion extending from a downstream-side end of the cylindrical portion in such a manner that a cross-section diameter of the downstream-side cone portion decreases toward the downstream-side exhaust duct; and a substrate having a cell structure and being arranged inside of the cylindrical portion of the outer tube, wherein a catalyst layer in which a precious metal catalyst is carried on a carrier is formed on a cell wall surface of the substrate, the substrate has a center region and a peripheral region in a cross-section orthogonal to a length direction of the substrate, a cell density of the center region is higher than a cell density of the peripheral region, a projection portion when a projection of a cross-section of a connecting portion of the exhaust duct and the downstream-side cone portion on the substrate falls within the center region, a downstream-side surface of the substrate is directly opposite to an opening of the downstream-side exhaust duct, and a diameter of the center region is larger than a diameter of the connecting portion of the exhaust duct and the downstream-side cone portion. |
