Patent ID: 8327630
Filing Date: 2012-12-11
Classification: B01D,F01N,Y02C,Y02T

Abstract:
1. An exhaust emission control device, comprising: a post-treatment unit for depuration of exhaust gas passing therethrough arranged in an exhaust system, a layout being applied which introduces the exhaust gas into the post-treatment unit through turnabout; and an introductory part which encircles an inlet end of the post-treatment unit and which receives the exhaust gas through an exhaust inlet port, an axis of the exhaust inlet port being oriented in a direction perpendicular to an axis of said post-treatment unit, wherein said introductory part is formed with a first depression having a concavity that faces away from the inlet end of the post-treatment unit, the first depression approaching the inlet end of the post-treatment unit as the first depression extends away from the exhaust inlet port into an introduction direction of the exhaust gas, an exhaust passage connected to the exhaust inlet port of the introductory part extends upstream toward an outlet side of the post-treatment unit, such that an axis of a portion of the exhaust passage upstream of the second depression is parallel to the axis of the post-treatment unit, and a second depression is formed just upstream of a curved portion constituted by the exhaust passage and the exhaust inlet port so as to guide the flow of the exhaust gas away from a turning direction of the curved portion.