| 摘要 |
A vehicle exhaust system is disclosed in which a sound-attenuating device in the form of a quarter-wave tuner is incorporated within an exhaust gas pipe. A partition of sheetlike construction extends axially of the pipe over a predetermined length and extends transversely from wall to wall with its opposite edges in contact therewith to separate the space into first and second portions. In the tuner structure the length is approximately equal to one-fourth of the wavelength of the sound energy to be attenuated and the upstream end of the partition is located at a pressure point corresponding to the wavelength to be attenuated and the downstream end of the partition is closed. The pipe is formed with protuberances on the internal surface such as would result from indentations of the wall and the protuberances are arranged along the length of the pipe to retain the sheetlike partition in place in engagement with the wall of the pipe. This construction permits the location of the partition in an exhaust gas pipe to form a sound-attenuating structure in either a straight or curved section of the pipe so that the pipe and the attenuating structure may be fit into the available space under the vehicle body.
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