A muffler cutter is fitted to a tailpipe of a vehicular exhaust system, the muffler cutter includes an exhaust pipe, a plurality of through-holes formed in a side wall of the exhaust pipe, a tubular heat shield plate provided around the exhaust pipe coaxially with the exhaust pipe, and a sound-absor
A muffler cutter is fitted to a tailpipe of a vehicular exhaust system, the muffler cutter includes an exhaust pipe, a plurality of through-holes formed in a side wall of the exhaust pipe, a tubular heat shield plate provided around the exhaust pipe coaxially with the exhaust pipe, and a sound-absorbing heat insulator provided between the exhaust pipe and the tubular heat shield plate. The sound-absorbing heat insulator is partially provided between the exhaust pipe and the tubular heat shield plate so as to have a curved shape. A closed space having a curved shape is formed between the exhaust pipe and the tubular heat shield plate in an area in which the sound-absorbing heat insulator is not provided. The distance between the exhaust pipe and the tubular heat shield plate in an area in which the closed space is formed is 1 to 50 mm.
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1. A muffler cutter that is fitted to a tailpipe of a vehicular exhaust system, the muffler cutter comprising: an exhaust pipe, a plurality of through-holes being formed in a side wall of the exhaust pipe;a tubular heat shield plate provided around the exhaust pipe coaxially with the exhaust pipe;a
1. A muffler cutter that is fitted to a tailpipe of a vehicular exhaust system, the muffler cutter comprising: an exhaust pipe, a plurality of through-holes being formed in a side wall of the exhaust pipe;a tubular heat shield plate provided around the exhaust pipe coaxially with the exhaust pipe;a space defined by the exhaust pipe and tubular heat shield plate, the space having a first portion and a second portion; anda sound-absorbing heat insulator provided only in the first portion of the space, whereinthe first portion and the second portion of the space each has a curved shape,the sound-absorbing heat insulator has a curved shape,the second portion of the space is a hollow and closed space, andthe exhaust pipe is spaced 1 to 50 mm apart from the tubular heat shield plate in the second portion of the space. 2. The muffler cutter according to claim 1, wherein the plurality of through-holes are formed in at least an area of the side wall of the exhaust pipe that is situated opposite to the sound-absorbing heat insulator. 3. The muffler cutter according to claim 1, wherein the sound-absorbing heat insulator is situated on a side of a vehicle main body when the muffler cutter is fitted. 4. The muffler cutter according to claim 2, wherein the sound-absorbing heat insulator is situated on a side of a vehicle main body when the muffler cutter is fitted. 5. The muffler cutter according to claim 3, wherein the closed space is situated opposite to the vehicle main body when the muffler cutter is fitted. 6. The muffler cutter according to claim 4, wherein the closed space is situated opposite to the vehicle main body when the muffler cutter is fitted. 7. The muffler cutter according claim 1, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 8. The muffler cutter according claim 2, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 9. The muffler cutter according claim 3, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 10. The muffler cutter according claim 4, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 11. The muffler cutter according claim 5, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 12. The muffler cutter according claim 6, wherein the sound-absorbing heat insulator has a thermal conductivity measured at 400° C. of 0.01 to 0.1 W/(m·K). 13. The muffler cutter according claim 1, wherein the closed space covers 20-80% of a total outer surface area of the exhaust pipe. 14. The muffler cutter according claim 1, wherein the sound absorbing heat insulator covers 20-80% of a total outer surface area of the exhaust pipe. 15. The muffler cutter according claim 1, wherein the closed space is defined by the exhaust pipe, the tubular heat shield plate, and the sound absorbing heat insulator. 16. The muffler cutter according claim 15, wherein exhaust gas enters the closed space from the plurality of through-holes formed in the exhaust pipe and through the sound absorbing heat insulator. 17. The muffler cutter according to claim 1, wherein a total length of the tailpipe provided with the muffler cutter is 50 to 500 mm. 18. The muffler cutter according to claim 1, wherein the plurality of through-holes are formed in 1 to 95% of an area of a total outer surface of the exhaust pipe. 19. The muffler cutter according to claim 1, wherein a bulk density of the sound-absorbing heat insulator is 50 to 400 kg/m3. 20. The muffler cutter according to claim 1, wherein the plurality of through-holes are formed in 25-50% of an area of a total outer surface of the exhaust pipe.
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