| 摘要 |
PURPOSE: A front pipe structure for an exhaust system is provided to prevent degradation of volumetric efficiency of engine caused due to the pressure wave generated during exhaust, while reducing vibrations and noises of exhaust system. CONSTITUTION: An exhaust system comprises an exhaust manifold connected to an exhaust port of an engine; and a front pipe(20) for guiding the exhaust gas generated from the rear end of the exhaust manifold to reach a catalyst purifier. The front pipe includes a plurality of dual pipes(22) communicated to the exhaust manifold; a confluent pipe(24) for combining the plural passages formed by the dual pipes into a single passage; a single pipe(26) having an end connected to the confluent pipe and the other end connected to the catalyst purifier; and a cover member(28) having both sides arranged along the outer surfaces of the dual pipes, confluent pipe and the single pipe in an airtight manner such that an air layer is formed between the cover member and the outer surfaces of the pipes.
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