Patent ID: 8627653

Claim:
An exhaust purification apparatus provided in an exhaust path of a diesel engine, comprising: a first processing unit which is a substantially cylindrical exhaust path provided therein with a filter carrier and removes mainly particulate matter from exhaust gas of the diesel engine; a second processing unit which is a substantially cylindrical exhaust path provided therein with a reduction catalytic carrier and removes mainly nitrogen oxide from the exhaust gas after passing through the first processing unit; a communication pipe which guides the exhaust gas from an exhaust outlet provided in a peripheral surface of the first processing unit to an exhaust inlet provided in a peripheral surface of the second processing unit; and a reducing agent supply unit which supplies reducing agent to the exhaust gas so as to reduce the nitrogen oxide, wherein the first processing unit and the second processing unit are provided in parallel to each other while the exhaust outlet faces the exhaust inlet, wherein the reducing agent supply unit is provided in the communication pipe, wherein the upstream side of the communication pipe is provided from the exhaust outlet of the first processing unit along the outer perimeter of the first processing unit, the communication pipe passes through a space between the first processing unit and the second processing unit at which the first processing unit is the most close to the second processing unit, and the downstream side of the communication pipe is connected to the exhaust inlet of the second processing unit along the outer perimeter of the second processing unit, and wherein the communication pipe has a reduced diameter portion, in which a diameter of a section of an exhaust gas passage is contracted, in a middle portion positioned between the first processing unit and the second processing unit.