| 摘要 |
PURPOSE: A variable muffler is provided to achieve improved efficiency of noise attenuation by varying the exhaust flow in reaction to the engine operating condition. CONSTITUTION: A variable muffler(1) comprises a case(2), and is connected to an exhaust pipe through an exhaust gas inlet port(3) and an exhaust gas outlet port(4) formed at front and rear surfaces of the case, respectively. The variable muffler includes bimetals(9,10) which are formed by stacking inner plates(5,6) made of a material having a high coefficient of thermal expansion and outer plates(7,8) made of a material having a low coefficient of thermal expansion. The bimetals are arranged in front of the exhaust gas outlet port so that the bimetals are opposed with each other. Each of bimetals is strained in reaction to the temperature of exhaust gas, to thereby vary passage of exhaust gas.
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