| 摘要 |
PURPOSE:To prevent the noise in a silencer from being emitted outward by disposing expansion chambers and resonance chambers thereof inside an external casing. CONSTITUTION:Exhaust gas from an engine is fed from a guide pipe 45 into the first expansion chamber 24 for expansion and comes into a resosnance chamber 30, which is communicated therewith through a hole 39, for resonance so that the gas is silenced by those expansion and resonance effects. The gas is then carried into the second expansion chamber 32 through a pipe 41 having many pores 43 and into a resonance chamber 31, which are communicated with holes 28 on a partition wall 29 and pores 43 on the pipe 41, so that the gas is silenced by those respective expansion and resonance effects. Thereafter, the gas is discharged outside from a pipe 47. In this silencer, the first expansion chamber 24 and the resonance chamber 31 are formed by three partition walls 22, 23, 29 between casings 25, 26, owing to which noise or vibration in each of the chambers 24, 31 is dampened inside the casings and will not be directly emitted outward. |
