| 摘要 |
PROBLEM TO BE SOLVED: To slim a vehicle body without affecting an output of an engine; to improve the degree of freedom of a driving attitude; and to achieve sufficient silencing effect without enlarging a muffler. SOLUTION: A branch joint 20 is provided at the rear portion of an exhaust pipe 15. Second exhaust pipes 21, 22 with a small diameter arranged one above the other are branched at a position forward of an intersecting position P with a pivot plate 6. The second exhaust pipes 21, 22 with the small diameter are made to intersect the inside of the pivot plate 6. Thus, the gap between the pivot plate 6 and the engine 12 can be narrowed while ensuring smooth exhaust. The exhaust path lengths of both the second exhaust pipes are made to be offset from each other so as not to be the integral multiple of the wavelength of the exhaust sound in the ordinary operating area. This allows exhaust gases to interfere with each other in the muffler 23. Thus, the exhaust sound can be reduced and the muffler 23 can be downsized. This allows slimming of the vehicle body without lowering the output of the engine. COPYRIGHT: (C)2011,JPO&INPIT
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