Patent ID: 8250859

Claim:
An exhaust emission control device, comprising: a particulate filter incorporated in an exhaust pipe for capturing particulates in an exhaust gas; a selective reduction catalyst downstream of said particulate filter and capable of selectively reacting NO x with ammonia even in the presence of oxygen; and a flow passage for communication between the particulate filter and the selective reduction catalyst including a first connection for folding-back of the exhaust gas discharged from an exit of the particulate filter; a linear portion arranged between and along the particulate filter and the selective reduction catalyst for guidance of the exhaust gas from the first connection; and a second connection for folding-back of the exhaust gas discharged from the linear portion to an inlet of the selective reduction catalyst; and urea water addition means upstream of the second connection, the urea water addition means capable of adding urea water as a reducing agent between the particulate filter and the selective reduction catalyst, wherein: the second connection includes a first bend curved at a tip of the linear portion where urea water in the exhaust gas collides against a first wall surface in a folded manner and a second bend curved at the first bend where urea water in the exhaust gas further collides against a second wall surface in a folded manner, said particulate filter and said selective reduction catalyst are arranged side-by-side, an axis of the particulate filter is substantially parallel to an axis of the linear portion of the flow passage for guidance of the exhaust gas from the particulate filter to the selective reduction catalyst, and the axis of the particulate filter is spaced apart from the axis of the linear portion by a first distance.