| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise of a muffler by solving a problem that the vibration of the muffler is increased, and to reduce the weight of an engine by solving such a problem that the weight of the engine is increased for ensuring the rigidity of a supporting member such as an exhaust pipe for supporting the muffler. SOLUTION: Right and left exhaust port side mounting parts 83, 83 are formed on an exhaust pipe 43 with the center of the exhaust pipe 43 held by one end thereof in order to mount one end on an exhaust port 23. Right and left muffler side connection parts 84, 84 are formed with the center of the exhaust pipe 43 held by the other end to connect the other end to a muffler 40. A muffler supporting part 82 for supporting the muffler 40 is formed on the side of an engine 10 (a cylinder head 21) side shown in Fig. 4. The right and left exhaust port side mounting parts 83, 83 and the muffler supporting part 82 are arranged so that the center G1 of gravity of the muffler 40 is located in a triangle formed by connecting the right and left exhaust port side mounting parts 83, 83 and the muffler supporting part 82 to each other in plan view. COPYRIGHT: (C)2007,JPO&INPIT
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