| 摘要 |
PURPOSE: A dual muffler exhaust device is provided to improve the timbre of a noise by balancing the noises of a left and a right mufflers and to let a user adjust the level of the noise. CONSTITUTION: A dual muffler exhaust device includes a front exhaust pipe(2) and a left and a right main mufflers(3,4). The distances from the intersection of a connecting pipe(7) and the front exhaust pipe to the left and right main mufflers are the same. The timbre of the noise generated at the left muffler is the same as that of the right muffler. If a driver rotates an adjusting handle clockwise, an umbrella-shaped valve plate advances into a chamber. Then, the sectional area of the chamber is reduced and the level of the booming sound decreases. Upon counterclockwise rotating the adjusting handle, the level of the booming sound increases.
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