US 9,810,117 B2
Muffler cutter
Akinao Hiraoka, Tokyo (JP); Isami Abe, Tokyo (JP); and Yoshifumi Fujita, Tokyo (JP)
Assigned to NICHIAS CORPORATION, Tokyo (JP)
Appl. No. 14/784,332
Filed by NICHIAS CORPORATION, Tokyo (JP)
PCT Filed Apr. 9, 2014, PCT No. PCT/JP2014/060314
§ 371(c)(1), (2) Date Oct. 14, 2015,
PCT Pub. No. WO2014/171380, PCT Pub. Date Oct. 23, 2014.
Claims priority of application No. 2013-085064 (JP), filed on Apr. 15, 2013.
Prior Publication US 2016/0053642 A1, Feb. 25, 2016
Int. Cl. F01N 1/24 (2006.01); F01N 1/04 (2006.01); F01N 13/14 (2010.01); F01N 13/20 (2010.01); F01N 13/08 (2010.01); F01N 1/00 (2006.01); F01N 1/02 (2006.01); F01N 13/00 (2010.01)
CPC F01N 1/24 (2013.01) [F01N 1/006 (2013.01); F01N 1/04 (2013.01); F01N 13/082 (2013.01); F01N 13/14 (2013.01); F01N 13/20 (2013.01); F01N 2470/02 (2013.01)] 20 Claims
OG exemplary drawing
 
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; and
a sound-absorbing heat insulator provided only in the first portion of the space, wherein
the 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, and
the exhaust pipe is spaced 1 to 50 mm apart from the tubular heat shield plate in the second portion of the space.