| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust manifold capable of reducing the turbulence of exhaust flow which is the backflow to a branch pipe through a collective chamber and of suppressing the occurrence of vibrations without resulting in the increase of weight thereby. SOLUTION: The exhaust manifold 1 is provided with a plurality of branch pipes 3 including a double pipe part formed by coaxially inserting an inner pipe 3b into an outer pipe 3a, and whose upstream sides are connected with exhaust ports of a multi-cylinder engine; and a collective chamber 4 connected with downstream sides of the branch pipes, wherein a small diameter part 7 which is extended to the downstream side farther than the downstream end of the inner pipe and which has the inner diameter size D2 made not larger than the inner diameter size D1 of the inner pipe. In particular, it is preferable that a damping member 9 is interposed between the outer peripheral surface of a downstream end in the inner pipe and inner peripheral surface of the outer pipe. COPYRIGHT: (C)2007,JPO&INPIT
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