1. Field of the Invention
The present invention relates to a muffler arranged in an exhaust path for reducing exhaust noise.
2. Description of the Related Art
FIG. 1 shows a muffler according to a related art. In the muffler 50, exhaust gas passes through an upstream pipe 54 and enters a first chamber 51 through small holes 54a. Also, the exhaust gas exits from an outlet end of the upstream pipe 54 and enters a second chamber 52. The exhaust gas in the first chamber 51 enters a downstream pipe 55 through an inlet end thereof. The exhaust gas in the second chamber 52 enters the downstream pipe 55 through small holes 55a of the downstream pipe 55. The exhaust gas is then discharged into the atmosphere. According to the flow of exhaust gas mentioned above, noise from an engine passes through the upstream pipe 54 and enters the muffler 50. The noise expands when the exhaust gas enters the first chamber 51 through the small holes 54a and contracts when the exhaust gas flows into the downstream pipe 55. Also, the noise expands when the exhaust gas enters the second chamber 52 from the upstream pipe 54 and is muffled when the exhaust gas enters the downstream pipe 55 through the small holes 55a. 