| 摘要 |
<p>A second silencer (24) is separate from a first silencer (22). A first exhaust pipe (21) connects an exhaust port and the first silencer. A connecting pipe portion (23) connects the first silencer (22) and the second silencer (24). A first expansion chamber (31) of the first silencer is located downstream from the first exhaust pipe in the exhaust flow. A second expansion chamber (32) of the first silencer is partitioned from the first expansion chamber. The second expansion chamber (32) is located downstream from the first expansion chamber (31). The connecting pipe portion includes a second exhaust pipe (28), an exhaust control valve (29), and a third exhaust pipe (30). The second exhaust pipe (28) is connected to the first expansion chamber (31). The exhaust control valve (29) is disposed on the second exhaust pipe (28). The exhaust control valve controls the flow passage area of the second exhaust pipe. The third exhaust pipe (30) is connected to the second expansion chamber (32).</p> |
