Patent ID: 8015802

Claim:
An exhaust gas purification device for an internal combustion engine, comprising: an inflow and outflow section divided into an inlet chamber into which unpurified exhaust gas flows and an outlet chamber from which purified exhaust gas is discharged, with the inlet chamber and the outlet chamber being arranged concentrically; a catalyst installation section which is detachably connected to the inflow and outflow section and in which two or more kinds of catalysts differing in an object of treatment are arranged concentrically around an axis along a connecting direction of the catalyst installation section and the inflow and outflow section and integrated with each other; and a communication chamber forming section detachably connected to a side of the catalyst installation section opposite to an inflow and outflow section side and adapted to reverse a flow of exhaust gas flowing in through the inlet chamber to a direction of the outlet chamber; wherein the catalyst installation section is reversably connectable to the inflow and outflow section and the communication chamber forming section.