EXHAUST DEVICE FOR MULTICYLINDER INTERNAL COMBUSTION ENGINE

PURPOSE:To suppress the thermal stress by reducing the temperature difference of an exhaust collecting chamber by connecting a plurality of exhaust pipes with the exhaust collecting chamber at the inlet of a catalytic container and installing the exhaust pipes so that the exhaust gas is sprayed onto the side walls of the exhaust collecting chamber. CONSTITUTION:An exhaust collecting chamber 11 is connected with the inlet side of a catalytic container 1 in which a catalyst 4 is accommodated. Exhaust pipes 15a-15d are connected with the front surface walls 13b and13c and side walls 13a and 13d of the collecting chamber 11. In this case, the exhaust pipes 15a and 15d connected with the both side walls 13a and 13d are installed towards the side walls on the opposite side and the edge surface of the catalyst close to the side walls. Further, the exhaust pipes 15b and 15d connected with the front surface walls 13b and 13c are installed towards the edge surfaces of the center part of the catalyst 4. Therefore, the temperature difference of the whole exhaust collecting chamber is reduced by directly spraying a portion of the exhaust gas onto the side walls, and the thermal stress can be suppressed.