| 摘要 |
The improved high performance muffler (12) is used to attenuate the sound waves in exhaust gases from internal combustion engines and the like and has a casing (14), which includes a closed volume defined by side walls, a top wall (16), a bottom wall (18) and inlet and outlet end caps (26, 28). The casing (14) also has a defined exhaust gas-flow passageway, which extends between the end caps (26, 28), which is bounded by upper and lower walls within the casing and the side walls, and which includes inlet and outlet chambers adjacent to the inlet and outlet end caps, respectively. Two spaced apart, gas-flow channels. A gas-flow director assembly (56), disposed between the side walls and the upper and lower walls, defines two spaced apart gas-flow channels. The gas-flow channels have a uniform, smooth cross section, and their lengths are substantially equal. The gas-flow director assembly (56) divides the exhaust gases flowing into the gas inlet chamber into two substantially unrestricted and equivolume gas streams, and also defines an intermediate chamber, which communicates with the gas-flow channels, intermediate their ends, so as to permit the exhaust gases flowing in the channels to expand and mix for sound attenuation. Perforations in the upper and lower walls permit sound waves in the exhaust gases to be attenuated in sound absorption materials (91, 102) disposed in the closed volume of the casing about the gas-flow passageway.
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