Patent ID: 8356690
Filing Date: 2013-01-22
Classification: F01N

Abstract:
1. An exhaust apparatus for an internal combustion engine, comprising: an exhaust gas pipe having one end portion formed with an upstream open end positioned at an upstream side of exhaust gas discharged from an internal combustion engine and connected with a sound deadening device, and the other end portion formed with a downstream open end positioned at a downstream side of the exhaust gas to discharge the exhaust gas to the atmosphere; a diameter expansion structure formed on at least one of the exhaust gas upstream side and the exhaust gas downstream side of the exhaust gas pipe to be expanded in diameter toward one of the upstream open end and the downstream open end; and a reflection plate provided in the diameter expansion structure in opposing relationship with the discharge direction of the exhaust gas and having a single central open portion passing through the plate in the discharge direction of the exhaust gas and a closed portion closing the exhaust gas pipe, the plate being arranged to generate an open end reflection wave at the open portion and a closed end reflection wave at the closed portion in such a manner that the open end reflection wave and the closed end reflection wave interfere with each other.