| US 7,562,521 B2 | ||
| SCR muffler | ||
| Daisuke Shirai, Tokyo (Japan); Naobumi Yamada, Tokyo (Japan); Hitoshi Hiramoto, Tokyo (Japan); Isamu Kanaya, Ageo Saitama (Japan); and Hiroki Ueno, Ageo Saitama (Japan) | ||
| Assigned to Tokyo Roki Co., Ltd., Kanagawa (Japan); and Nissan Diesel Motor Co., Ltd., Saitama (Japan) | ||
| Appl. No. 10/588,203 PCT Filed Feb. 02, 2005, PCT No. PCT/JP2005/001456 § 371(c)(1), (2), (4) Date Nov. 21, 2006, PCT Pub. No. WO2005/073526, PCT Pub. Date Aug. 11, 2005. |
||
| Claims priority of application No. 2004-026074 (JP), filed on Feb. 02, 2004; and application No. 2004-035448 (JP), filed on Feb. 12, 2004. | ||
| Prior Publication US 2007/0169467 A1, Jul. 26, 2007 | ||
| Int. Cl. F01N 3/00 (2006.01); F01N 3/10 (2006.01) | ||
| U.S. Cl. 60—286 [60/301] | 1 Claim |
| 1. An SCR muffler which comprises:
an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas;
an exhaust pipe that allows the exhaust gas to flow into the SCR catalyst and has air holes in its portion to be inserted
into the muffler; and
a reducing agent supplying means that supplies a reducing agent or a reducing agent precursor to the exhaust gas,
characterized in that a plate having air holes which disperse and make a flow of the exhaust gas uniform is attached to an
end of the exhaust pipe and greater in diameter than the exhaust pipe, and the air holes are arranged only in an area outside
the diameter of the exhaust pipe, and in that the plate has a cross section shaped like a convex tapering upstream only in
an area within the diameter of the exhaust pipe.
|