| 摘要 |
a flowing-in tube(17) and exhausting tubes(18,19) connected with silencing chambers(12,13,14) to flow exhaust gas; a back pressure guiding tube(24) installed in the muffler(11); a guide shaft(26) fixed on an inside wall of the muffler(11); a flange(26a) formed an end of the guide shaft to close a valve(25); and a spring(27) located between the valve(25) and the inside wall of the muffler(11) to control the valve(25) by exhaust gas pressure.
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