Sango Co., Ltd.

Masayoshi Tange

Masashi Ota

Osamu Kuroda

Masayuki Yokoi

Masahiro Maeno

A single valve member is provided for selecting communication of one of two flow passages constituting an exhaust flow passage, and continuously providing a flow passage area of the selected one of the two flow passages. According to this valve member, a changeover of flow passage between a main flow passage with an exhaust processing device disposed therein and a bypass flow passage is performed, and each flow passage area is regulated, to meet an output requirement, exhaust processing requirement and muffling requirement, appropriately. For example, a single valve memberis disposed on the upstream side or downstream side of a start catalytic converter, whereby communication of one of a main flow passageand a bypass flow passageis selected, and a flow passage area of the selected passage is continuously provided.

Exhaust apparatus of an internal combustion engine

A muffler in which in order to reduce a harsh high-frequency component exhaust noise as exhaust noise of a vehicle, and relieve a feeling of discomfort due to the exhaust noise, on at least one of an inner plate and an outer plate, a plurality of dot-shaped convex portions and dot-shaped concave portions are provided, and the convex portions and concave portions are alternately arranged to be surrounded with each other. Furthermore, the convex portion is connected to the concave portion by a curved surface.

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Nagoya, Japan

Masayoshi Tange