| 摘要 |
PURPOSE: A muffler structure is provided to reduce exhaust back pressure and achieve an improved engine output while effectively reducing low frequency, intermediate frequency, and high frequency noise of exhaust gas and allowing an exhaust gas passage to be gradually reduced in proportion to the size of inlet. CONSTITUTION: A muffler structure comprises an inlet pipe(11) vertically arranged at a portion of a case(10) and which has at one surface thereof a plurality of holes(11a), a flow pipe(12) horizontally arranged at a center of upper portion of the case(10) so as to move the exhaust gas flowed in through the inlet pipe(11) to a rear end of the case(10), the flow pipe(12) having at a rear end thereof a plurality of holes(12a), a first expansion portion(13) formed at an end of the pipe(12) to have a space of a predetermined size and which reduces low frequency noise with an expansion of exhaust gas passed through the pipe(12), a second expansion portion(14) formed beneath a front end of the pipe(12) to have a space of a predetermined size and which reduces low frequency noise with an expansion of a portion of exhaust gas flowed in through the inlet pipe(12), and an outlet pipe(15) having one end communicated to the portion(14), an intermediate portion penetrating through the portion(13) and the other end exposed toward the outside of the case(10), the pipe(15) having at an outer periphery thereof a plurality of holes(15a).
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