| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust manifold improving reliability, by preventing a branch portion from being damaged by reducing stress in a branch pipe portion of an inner pipe, when the inner pipe is exposed to high temperature exhaust gas. Ž<P>SOLUTION: A pair of inner pipe holding members 34 and 35 of a half-split shape are interposed between the inner pipe 25 and an outer pipe 26 of a double confluent pipe portion 13B of the exhaust manifold so as to define a specific clearance S between the inner pipe 25 and the outer pipe 26. These inner pipe holding members 34 and 35 are welded to the inner pipe 25 and the outer pipe 26. These inner pipe holding members 34 and 35 includes: semicircular portions 34a, 34b, 35a and 35b joined to an outer peripheral portion of branch pipe portions 23 and 24 and an inner peripheral portion of the outer pipe 26; and connecting portions 34c and 35c integrally arranged with the semicircular portions 34a, 34b, 35a and 35b and connecting the semicircular portions 34a, 34b, 35a and 35b. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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