| 摘要 |
A muffler (20) is provided by upstream and downstream outer shells (28 and 30) and a single sole internal baffle (32 or 110 or 120), all three of which are joined to each other around an outer peripheral edge (34). The internal baffle defines a first chamber (36) between the internal baffle and the upstream outer shell. The internal baffle has an extension portion (38) extending away from the upstream outer shell and toward and into the downstream outer shell and forming second and third chambers (40 and 42) between the internal baffle and the downstream outer shell and forming multiple sound attenuating tubed passages (44 and 46, 114, 124 and 128) bounded by the downstream outer shell and the extension portion and connecting the second and third chambers on distally opposite ends (48 and 50) of the extension portion. The baffle has an opening (52) therethrough adjacent the extension portion and connecting the first and second chambers.
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