| 摘要 |
PURPOSE:To eliminate exhaust noise effectively with simple and small device by branching pulsating exhaust wave from engine into plural flows then shifting phase of expansion timing for every branch to expand pulsating wave and converting to constant pressure flow. CONSTITUTION:Exhaust from engine is led as plusating pressure wave to the flow-in port 4 of muffler 1 and expanded in expansion chamber 9. Then it is passed through plural branch paths 11a-11d formed between spiral guide walls 10 planted on the outercircumferential face of conical head 8 to a gap 7 between outer tube 1 and inner tube 6. Consequently exhaust flow is branched and converted into spiral flow. Here single line of opening 12 is made circumferentially in the inner tube 6 where distances from the downstream end of each branch paths 11a-11d to the opening 12 are made different. Consequently each exhaust branch will reach to the opening 12 with timing shift and expand. Thereafter each exhaust branch will be guided through a guide vane 18 to the delivery port 5. |
