| 摘要 |
PROBLEM TO BE SOLVED: To improve the tone quality of exhaust sound while avoiding enlargement of an exhaust manifold 1. SOLUTION: A first exhaust pipe extending from a #1 cylinder located at the foremost end, to a downstream side end extends backward almost in a straight line along the cylinder row direction of an internal combustion engine. A #3 branch pipe 15 for a #3 cylinder and a #5 branch pipe 16 for a #5 cylinder sequentially join the first exhaust pipe. The #3 branch pipe 15 joins at the intermediate pipe 12 serving as a first volume part 31, and the joining angle is substantially 0°. The #5 branch pipe 16 joins at the outlet pipe 13 serving as a second volume part 32, and the joining angle is substantially 0°. Joining parts are provided with the volume parts 31, 32 to suppress the increase of components other than the basic order due to the complicated flow at the joining parts to thereby improve the tone quality of exhaust sound. At the same time, the joining angles can be minimized to reduce ventilation resistance. COPYRIGHT: (C)2005,JPO&NCIPI
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