Patent ID: 9593612
Date: 2017-03-14
CPC Classifications: F01N

Claim:
1. An internal combustion engine comprising: an internal combustion engine main body in which a fuel chamber is formed; an exhaust manifold mounted to the internal combustion engine main body; a turbine of a turbocharger which is arranged at a downstream side of the exhaust manifold; a catalyst converter attached to a downstream end of the turbine and provided with a catalyst for purifying exhaust gas, and a catalyst section for containing the catalyst; a flange secured at an upstream end of the catalyst converter and coupled to the downstream end of the turbine; and a protuberance provided in an inner diameter section of the flange and configured to change a cycle of a pressure pulsation of flow of the exhaust gas to avoid resonance in the catalyst section due to the flow of the exhaust gas, wherein the flange is a plate-like member protruding radially outside relative to the upstream end of the catalyst converter, and has a first thickness measured in a direction of the flow of the exhaust gas, the protuberance is formed from the flange itself and of flange material, and has a second thickness measured in a direction of the flow of the exhaust gas, and the second thickness of the protuberance is equal to the first thickness of the flange at said inner diameter section.