| 摘要 |
A catalyst-attached muffler includes an expansion chamber ( 25 ) defined by a cup-shaped fore-side outer wall panel ( 21 ) and a cup-shaped rear-side outer wall panel ( 22 ), both panels being removably attached to each other; a partition panel ( 23 ) interposed between the fore-side outer wall panel and the rear-side outer wall panel to partition the expansion chamber into a first expansion chamber ( 25 A) and a second expansion chamber ( 25 B). A closed-end cylindrical diffuser ( 40 ) is positioned in the first expansion chamber; and a gas-permeable exhaust gas-purifying catalyst ( 30 ) is inserted into and fixed to the diffuser, wherein exhaust gas from the exhaust port ( 10 ) of a cylinder of internal combustion engine is permitted to enter, via the catalyst, into the first expansion chamber, then to flow out of the first expansion chamber and to enter, via an opening ( 23 e) formed in the partition panel, into the second expansion chamber, and to flow out of the second expansion chamber through an outlet ( 29 ) formed in the fore-side outer wall panel, thereby discharging the exhaust gas into external atmosphere.
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