Exhaust pipe part and exhaust apparatus for internal combustion engine

An exhaust pipe part to be attached to an exhaust pipe and constituting part of the exhaust pipe, the exhaust pipe having at one end portion an upstream open end connected with a sound deadening device positioned at an upstream side of exhaust gas discharged from an internal combustion engine, and at the other end portion a downstream open end to allow the exhaust gas discharged to the atmosphere, comprising:

• a hollow member to be connected with the exhaust pipe in axial alignment with the exhaust pipe to be positioned within an area covering a node portion in a sound pressure distribution of an air column resonance caused in the exhaust pipe, and
• a short pipe provided in the hollow member and having a predetermined length to extend in the axial direction of the exhaust pipe,
• the short pipe having a closed end at an axial one end thereof and an open end at the axial other end thereof, the closed end being positioned at almost the same position as that of the node portion in the sound pressure distribution of a standing wave formed by the air column resonance caused in the exhaust pipe,
• the standing wave of the air column resonance having a wave length λ, and the short pipe being set to have a length less than or equal to ⅛λ.