| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust system of an engine capable of reducing exhaust noise and improving an output of the engine.SOLUTION: An exhaust system of an engine includes: an exhaust pipe 61 connected to an exhaust port of the engine 50; and a muffler 62 attached to a downstream end of the exhaust pipe 61 and for reducing exhaust noise. The muffler 62 includes: an inner cylinder part 71 connected to the downstream end of the exhaust pipe 61; an outer cylinder part 72 covering an outside of the inner cylinder part 71; and noise absorbing materials 91, 92, and 93 disposed between the inner cylinder part 71 and the outer cylinder part 72. A plurality of first communication holes 81 providing communication between an inside and an outside of the inner cylinder part 71 is formed in an upstream part 71a of the inner cylinder part 71. A plurality of second communication holes 82 providing communication between the inside and the outside of the inner cylinder part 71 is formed in a downstream part 71b of the inner cylinder part 71. The plurality of first communication holes 81 includes guide walls 85 extending toward the inside of the inner cylinder part 71 and inlet openings 86 formed by the guide walls 85 and opened toward the upstream side of exhaust. |
