초록 ▼

A structure of an exhaust manifold branch collecting portion includes a double collecting pipe 21 for collecting a plurality of exhaust openings 11A, 17A. The double collecting pipe 21 is comprised of an inner pipe 21-1 and an outer pipe 21-2, which are connected integrally to each other. In a space

A structure of an exhaust manifold branch collecting portion includes a double collecting pipe 21 for collecting a plurality of exhaust openings 11A, 17A. The double collecting pipe 21 is comprised of an inner pipe 21-1 and an outer pipe 21-2, which are connected integrally to each other. In a space formed between the inner pipe 21-1, the outer pipe 21-2, and a ring-shaped stainless steel cushion member 22-2, a tubular cushion member 22-1, which is thermally expanded and foamed, is arranged as a restricted cushion structure.

대표청구항 ▼

1. A structure of an exhaust manifold branch collecting portion including a collecting pipe for collecting a plurality of exhaust openings, wherein the collecting pipe is constructed as a double collecting pipe arrangement comprised of an inner pipe and an outer pipe, and wherein a noise absorption/

1. A structure of an exhaust manifold branch collecting portion including a collecting pipe for collecting a plurality of exhaust openings, wherein the collecting pipe is constructed as a double collecting pipe arrangement comprised of an inner pipe and an outer pipe, and wherein a noise absorption/heat insulating material to be expanded by heating is arranged between the inner pipe and the outer pipe, wherein the noise absorption/heat insulating material remains expanded when cooled after being once heated.2. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein the noise absorption/heat insulating material is heated and expanded by heat of exhaust gas from an engine.3. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein one ends of the inner pipe and the outer pipe are connected to each other, and a cushion part is arranged between the other ends of the inner pipe and the outer pipe.4. A structure of an exhaust manifold branch collecting portion according to claim 2, wherein one ends of the inner pipe and the outer pipe are connected to each other, and a cushion part is arranged between the other ends of the inner pipe and the outer pipe.5. A structure of an exhaust manifold branch collecting portion according to claim 3, wherein the cushion part is an elastic mesh member, into which a stainless steel wire is woven.6. A structure of an exhaust manifold branch collecting portion according to claim 4, wherein the cushion part is an elastic mesh member, into which a stainless steel wire is woven.7. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.8. A structure of an exhaust manifold branch collecting portion according to claim 2, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.9. A structure of an exhaust manifold branch collecting portion according to claim 3, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.10. A structure of an exhaust manifold branch collecting portion according to claim 4, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.11. A structure of an exhaust manifold branch collecting portion according to claim 5, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.12. A structure of an exhaust manifold branch collecting portion according to claim 6, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.13. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein the expansion ratio is 4.0 or more after heating for 30 minutes at 850° C.