| 摘要 |
PROBLEM TO BE SOLVED: To improve the output performance of an engine by integrally providing an exhaust chamber to a muffler in a motorcycle, and setting exhaust resistance of a plurality of exhaust pipes substantially equal to each other, when the pipe length is differed between the both, by increasing the diameter of the longer exhaust pipe. SOLUTION: A collecting muffler 13 of an exhaust device structure for motorcycle has a major diameter pipe part 61, having a front lid 62 and a rear lid 63 mounted on the front and rear ends, and its inner part is partitioned into a exhaust chamber part 64, to which exhaust pipes 11 and 12 are opened and a silencer part 65 for reducing exhaust noise by a bulkhead 66. The silencer part 65 is formed to have three chambers 71-73 partitioned by bulkheads 67 and 68. The exhaust pipe 11 is connected to the front cylinder of an engine and has a pipe length larger than exhaust pipe 12 connected to the rear cylinder. In this case, the inside diameter of the exhaust pipe 11 is set larger than that of the exhaust pipe 12, whereby the respective exhaust resistances of the exhaust pipes 11 and 12 to the rear end within the collecting muffler 13 are set substantially equal to each other.
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