Patent ID: 9650938
Date: 2017-05-16
CPC Classifications: F01N,Y02T

Claim:
1. An exhaust emission control device, comprising: a selective reduction catalyst for reacting NOx in an exhaust gas with ammonia, a particulate filter arranged upstream of the selective reduction catalyst for capturing particulates in the exhaust gas, an exhaust passage through which the particulate filter communicates with the selective reduction catalyst for guidance of the exhaust gas, and urea water addition means incorporated in the exhaust passage for adding urea water into the exhaust gas, wherein a portion of the aid exhaust passage adjacent to an added position of the urea water is constituted by a divisional piece made of material having higher corrosion resistance to a substance resulting from the addition of the urea water than that of a material constituting a remaining portion of the exhaust passage other than the adjacent portion, the divisional piece has front and rear ends inserted inside of upstream- and downstream-side exhaust passage through spigot joining, the divisional piece has a side surface formed with an injection port slantingly divergent upstream, the urea water addition means being fitted to the injection port from outside; and the divisional piece is bent in the form of an elbow suitable for adding the urea water at a corner in the exhaust passage.